2 # (C) Copyright 2000 - 2013
3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 # SPDX-License-Identifier: GPL-2.0+
11 This directory contains the source code for U-Boot, a boot loader for
12 Embedded boards based on PowerPC, ARM, MIPS and several other
13 processors, which can be installed in a boot ROM and used to
14 initialize and test the hardware or to download and run application
17 The development of U-Boot is closely related to Linux: some parts of
18 the source code originate in the Linux source tree, we have some
19 header files in common, and special provision has been made to
20 support booting of Linux images.
22 Some attention has been paid to make this software easily
23 configurable and extendable. For instance, all monitor commands are
24 implemented with the same call interface, so that it's very easy to
25 add new commands. Also, instead of permanently adding rarely used
26 code (for instance hardware test utilities) to the monitor, you can
27 load and run it dynamically.
33 In general, all boards for which a configuration option exists in the
34 Makefile have been tested to some extent and can be considered
35 "working". In fact, many of them are used in production systems.
37 In case of problems see the CHANGELOG and CREDITS files to find out
38 who contributed the specific port. The boards.cfg file lists board
41 Note: There is no CHANGELOG file in the actual U-Boot source tree;
42 it can be created dynamically from the Git log using:
50 In case you have questions about, problems with or contributions for
51 U-Boot you should send a message to the U-Boot mailing list at
52 <u-boot@lists.denx.de>. There is also an archive of previous traffic
53 on the mailing list - please search the archive before asking FAQ's.
54 Please see http://lists.denx.de/pipermail/u-boot and
55 http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
58 Where to get source code:
59 =========================
61 The U-Boot source code is maintained in the git repository at
62 git://www.denx.de/git/u-boot.git ; you can browse it online at
63 http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
65 The "snapshot" links on this page allow you to download tarballs of
66 any version you might be interested in. Official releases are also
67 available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
70 Pre-built (and tested) images are available from
71 ftp://ftp.denx.de/pub/u-boot/images/
77 - start from 8xxrom sources
78 - create PPCBoot project (http://sourceforge.net/projects/ppcboot)
80 - make it easier to add custom boards
81 - make it possible to add other [PowerPC] CPUs
82 - extend functions, especially:
83 * Provide extended interface to Linux boot loader
86 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
87 - create ARMBoot project (http://sourceforge.net/projects/armboot)
88 - add other CPU families (starting with ARM)
89 - create U-Boot project (http://sourceforge.net/projects/u-boot)
90 - current project page: see http://www.denx.de/wiki/U-Boot
96 The "official" name of this project is "Das U-Boot". The spelling
97 "U-Boot" shall be used in all written text (documentation, comments
98 in source files etc.). Example:
100 This is the README file for the U-Boot project.
102 File names etc. shall be based on the string "u-boot". Examples:
104 include/asm-ppc/u-boot.h
106 #include <asm/u-boot.h>
108 Variable names, preprocessor constants etc. shall be either based on
109 the string "u_boot" or on "U_BOOT". Example:
111 U_BOOT_VERSION u_boot_logo
112 IH_OS_U_BOOT u_boot_hush_start
118 Starting with the release in October 2008, the names of the releases
119 were changed from numerical release numbers without deeper meaning
120 into a time stamp based numbering. Regular releases are identified by
121 names consisting of the calendar year and month of the release date.
122 Additional fields (if present) indicate release candidates or bug fix
123 releases in "stable" maintenance trees.
126 U-Boot v2009.11 - Release November 2009
127 U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
128 U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
134 /arch Architecture specific files
135 /arm Files generic to ARM architecture
136 /cpu CPU specific files
137 /arm720t Files specific to ARM 720 CPUs
138 /arm920t Files specific to ARM 920 CPUs
139 /at91 Files specific to Atmel AT91RM9200 CPU
140 /imx Files specific to Freescale MC9328 i.MX CPUs
141 /s3c24x0 Files specific to Samsung S3C24X0 CPUs
142 /arm925t Files specific to ARM 925 CPUs
143 /arm926ejs Files specific to ARM 926 CPUs
144 /arm1136 Files specific to ARM 1136 CPUs
145 /ixp Files specific to Intel XScale IXP CPUs
146 /pxa Files specific to Intel XScale PXA CPUs
147 /s3c44b0 Files specific to Samsung S3C44B0 CPUs
148 /sa1100 Files specific to Intel StrongARM SA1100 CPUs
149 /lib Architecture specific library files
150 /avr32 Files generic to AVR32 architecture
151 /cpu CPU specific files
152 /lib Architecture specific library files
153 /blackfin Files generic to Analog Devices Blackfin architecture
154 /cpu CPU specific files
155 /lib Architecture specific library files
156 /m68k Files generic to m68k architecture
157 /cpu CPU specific files
158 /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
159 /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
160 /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
161 /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
162 /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
163 /lib Architecture specific library files
164 /microblaze Files generic to microblaze architecture
165 /cpu CPU specific files
166 /lib Architecture specific library files
167 /mips Files generic to MIPS architecture
168 /cpu CPU specific files
169 /mips32 Files specific to MIPS32 CPUs
170 /xburst Files specific to Ingenic XBurst CPUs
171 /lib Architecture specific library files
172 /nds32 Files generic to NDS32 architecture
173 /cpu CPU specific files
174 /n1213 Files specific to Andes Technology N1213 CPUs
175 /lib Architecture specific library files
176 /nios2 Files generic to Altera NIOS2 architecture
177 /cpu CPU specific files
178 /lib Architecture specific library files
179 /openrisc Files generic to OpenRISC architecture
180 /cpu CPU specific files
181 /lib Architecture specific library files
182 /powerpc Files generic to PowerPC architecture
183 /cpu CPU specific files
184 /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
185 /mpc5xx Files specific to Freescale MPC5xx CPUs
186 /mpc5xxx Files specific to Freescale MPC5xxx CPUs
187 /mpc8xx Files specific to Freescale MPC8xx CPUs
188 /mpc824x Files specific to Freescale MPC824x CPUs
189 /mpc8260 Files specific to Freescale MPC8260 CPUs
190 /mpc85xx Files specific to Freescale MPC85xx CPUs
191 /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
192 /lib Architecture specific library files
193 /sh Files generic to SH architecture
194 /cpu CPU specific files
195 /sh2 Files specific to sh2 CPUs
196 /sh3 Files specific to sh3 CPUs
197 /sh4 Files specific to sh4 CPUs
198 /lib Architecture specific library files
199 /sparc Files generic to SPARC architecture
200 /cpu CPU specific files
201 /leon2 Files specific to Gaisler LEON2 SPARC CPU
202 /leon3 Files specific to Gaisler LEON3 SPARC CPU
203 /lib Architecture specific library files
204 /x86 Files generic to x86 architecture
205 /cpu CPU specific files
206 /lib Architecture specific library files
207 /api Machine/arch independent API for external apps
208 /board Board dependent files
209 /common Misc architecture independent functions
210 /disk Code for disk drive partition handling
211 /doc Documentation (don't expect too much)
212 /drivers Commonly used device drivers
213 /dts Contains Makefile for building internal U-Boot fdt.
214 /examples Example code for standalone applications, etc.
215 /fs Filesystem code (cramfs, ext2, jffs2, etc.)
216 /include Header Files
217 /lib Files generic to all architectures
218 /libfdt Library files to support flattened device trees
219 /lzma Library files to support LZMA decompression
220 /lzo Library files to support LZO decompression
222 /post Power On Self Test
223 /spl Secondary Program Loader framework
224 /tools Tools to build S-Record or U-Boot images, etc.
226 Software Configuration:
227 =======================
229 Configuration is usually done using C preprocessor defines; the
230 rationale behind that is to avoid dead code whenever possible.
232 There are two classes of configuration variables:
234 * Configuration _OPTIONS_:
235 These are selectable by the user and have names beginning with
238 * Configuration _SETTINGS_:
239 These depend on the hardware etc. and should not be meddled with if
240 you don't know what you're doing; they have names beginning with
243 Later we will add a configuration tool - probably similar to or even
244 identical to what's used for the Linux kernel. Right now, we have to
245 do the configuration by hand, which means creating some symbolic
246 links and editing some configuration files. We use the TQM8xxL boards
250 Selection of Processor Architecture and Board Type:
251 ---------------------------------------------------
253 For all supported boards there are ready-to-use default
254 configurations available; just type "make <board_name>_config".
256 Example: For a TQM823L module type:
261 For the Cogent platform, you need to specify the CPU type as well;
262 e.g. "make cogent_mpc8xx_config". And also configure the cogent
263 directory according to the instructions in cogent/README.
266 Configuration Options:
267 ----------------------
269 Configuration depends on the combination of board and CPU type; all
270 such information is kept in a configuration file
271 "include/configs/<board_name>.h".
273 Example: For a TQM823L module, all configuration settings are in
274 "include/configs/TQM823L.h".
277 Many of the options are named exactly as the corresponding Linux
278 kernel configuration options. The intention is to make it easier to
279 build a config tool - later.
282 The following options need to be configured:
284 - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
286 - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
288 - CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
289 Define exactly one, e.g. CONFIG_ATSTK1002
291 - CPU Module Type: (if CONFIG_COGENT is defined)
292 Define exactly one of
294 --- FIXME --- not tested yet:
295 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
296 CONFIG_CMA287_23, CONFIG_CMA287_50
298 - Motherboard Type: (if CONFIG_COGENT is defined)
299 Define exactly one of
300 CONFIG_CMA101, CONFIG_CMA102
302 - Motherboard I/O Modules: (if CONFIG_COGENT is defined)
303 Define one or more of
306 - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
307 Define one or more of
308 CONFIG_LCD_HEARTBEAT - update a character position on
309 the LCD display every second with
312 - Board flavour: (if CONFIG_MPC8260ADS is defined)
315 CONFIG_SYS_8260ADS - original MPC8260ADS
316 CONFIG_SYS_8266ADS - MPC8266ADS
317 CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
318 CONFIG_SYS_8272ADS - MPC8272ADS
320 - Marvell Family Member
321 CONFIG_SYS_MVFS - define it if you want to enable
322 multiple fs option at one time
323 for marvell soc family
325 - MPC824X Family Member (if CONFIG_MPC824X is defined)
326 Define exactly one of
327 CONFIG_MPC8240, CONFIG_MPC8245
329 - 8xx CPU Options: (if using an MPC8xx CPU)
330 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
331 get_gclk_freq() cannot work
332 e.g. if there is no 32KHz
333 reference PIT/RTC clock
334 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
337 - 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
338 CONFIG_SYS_8xx_CPUCLK_MIN
339 CONFIG_SYS_8xx_CPUCLK_MAX
340 CONFIG_8xx_CPUCLK_DEFAULT
341 See doc/README.MPC866
343 CONFIG_SYS_MEASURE_CPUCLK
345 Define this to measure the actual CPU clock instead
346 of relying on the correctness of the configured
347 values. Mostly useful for board bringup to make sure
348 the PLL is locked at the intended frequency. Note
349 that this requires a (stable) reference clock (32 kHz
350 RTC clock or CONFIG_SYS_8XX_XIN)
352 CONFIG_SYS_DELAYED_ICACHE
354 Define this option if you want to enable the
355 ICache only when Code runs from RAM.
360 Specifies that the core is a 64-bit PowerPC implementation (implements
361 the "64" category of the Power ISA). This is necessary for ePAPR
362 compliance, among other possible reasons.
364 CONFIG_SYS_FSL_TBCLK_DIV
366 Defines the core time base clock divider ratio compared to the
367 system clock. On most PQ3 devices this is 8, on newer QorIQ
368 devices it can be 16 or 32. The ratio varies from SoC to Soc.
370 CONFIG_SYS_FSL_PCIE_COMPAT
372 Defines the string to utilize when trying to match PCIe device
373 tree nodes for the given platform.
375 CONFIG_SYS_PPC_E500_DEBUG_TLB
377 Enables a temporary TLB entry to be used during boot to work
378 around limitations in e500v1 and e500v2 external debugger
379 support. This reduces the portions of the boot code where
380 breakpoints and single stepping do not work. The value of this
381 symbol should be set to the TLB1 entry to be used for this
384 CONFIG_SYS_FSL_ERRATUM_A004510
386 Enables a workaround for erratum A004510. If set,
387 then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
388 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
390 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
391 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
393 Defines one or two SoC revisions (low 8 bits of SVR)
394 for which the A004510 workaround should be applied.
396 The rest of SVR is either not relevant to the decision
397 of whether the erratum is present (e.g. p2040 versus
398 p2041) or is implied by the build target, which controls
399 whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
401 See Freescale App Note 4493 for more information about
404 CONFIG_A003399_NOR_WORKAROUND
405 Enables a workaround for IFC erratum A003399. It is only
406 requred during NOR boot.
408 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
410 This is the value to write into CCSR offset 0x18600
411 according to the A004510 workaround.
413 CONFIG_SYS_FSL_DSP_DDR_ADDR
414 This value denotes start offset of DDR memory which is
415 connected exclusively to the DSP cores.
417 CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
418 This value denotes start offset of M2 memory
419 which is directly connected to the DSP core.
421 CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
422 This value denotes start offset of M3 memory which is directly
423 connected to the DSP core.
425 CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
426 This value denotes start offset of DSP CCSR space.
428 CONFIG_SYS_FSL_DDR_EMU
429 Specify emulator support for DDR. Some DDR features such as
430 deskew training are not available.
432 - Generic CPU options:
433 CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
435 Defines the endianess of the CPU. Implementation of those
436 values is arch specific.
438 - Intel Monahans options:
439 CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
441 Defines the Monahans run mode to oscillator
442 ratio. Valid values are 8, 16, 24, 31. The core
443 frequency is this value multiplied by 13 MHz.
445 CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
447 Defines the Monahans turbo mode to oscillator
448 ratio. Valid values are 1 (default if undefined) and
449 2. The core frequency as calculated above is multiplied
453 CONFIG_SYS_INIT_SP_OFFSET
455 Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
456 pointer. This is needed for the temporary stack before
459 CONFIG_SYS_MIPS_CACHE_MODE
461 Cache operation mode for the MIPS CPU.
462 See also arch/mips/include/asm/mipsregs.h.
464 CONF_CM_CACHABLE_NO_WA
467 CONF_CM_CACHABLE_NONCOHERENT
471 CONF_CM_CACHABLE_ACCELERATED
473 CONFIG_SYS_XWAY_EBU_BOOTCFG
475 Special option for Lantiq XWAY SoCs for booting from NOR flash.
476 See also arch/mips/cpu/mips32/start.S.
478 CONFIG_XWAY_SWAP_BYTES
480 Enable compilation of tools/xway-swap-bytes needed for Lantiq
481 XWAY SoCs for booting from NOR flash. The U-Boot image needs to
482 be swapped if a flash programmer is used.
485 CONFIG_SYS_EXCEPTION_VECTORS_HIGH
487 Select high exception vectors of the ARM core, e.g., do not
488 clear the V bit of the c1 register of CP15.
490 CONFIG_SYS_THUMB_BUILD
492 Use this flag to build U-Boot using the Thumb instruction
493 set for ARM architectures. Thumb instruction set provides
494 better code density. For ARM architectures that support
495 Thumb2 this flag will result in Thumb2 code generated by
498 CONFIG_ARM_ERRATA_716044
499 CONFIG_ARM_ERRATA_742230
500 CONFIG_ARM_ERRATA_743622
501 CONFIG_ARM_ERRATA_751472
503 If set, the workarounds for these ARM errata are applied early
504 during U-Boot startup. Note that these options force the
505 workarounds to be applied; no CPU-type/version detection
506 exists, unlike the similar options in the Linux kernel. Do not
507 set these options unless they apply!
512 The frequency of the timer returned by get_timer().
513 get_timer() must operate in milliseconds and this CONFIG
514 option must be set to 1000.
516 - Linux Kernel Interface:
519 U-Boot stores all clock information in Hz
520 internally. For binary compatibility with older Linux
521 kernels (which expect the clocks passed in the
522 bd_info data to be in MHz) the environment variable
523 "clocks_in_mhz" can be defined so that U-Boot
524 converts clock data to MHZ before passing it to the
526 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
527 "clocks_in_mhz=1" is automatically included in the
530 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
532 When transferring memsize parameter to linux, some versions
533 expect it to be in bytes, others in MB.
534 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
538 New kernel versions are expecting firmware settings to be
539 passed using flattened device trees (based on open firmware
543 * New libfdt-based support
544 * Adds the "fdt" command
545 * The bootm command automatically updates the fdt
547 OF_CPU - The proper name of the cpus node (only required for
548 MPC512X and MPC5xxx based boards).
549 OF_SOC - The proper name of the soc node (only required for
550 MPC512X and MPC5xxx based boards).
551 OF_TBCLK - The timebase frequency.
552 OF_STDOUT_PATH - The path to the console device
554 boards with QUICC Engines require OF_QE to set UCC MAC
557 CONFIG_OF_BOARD_SETUP
559 Board code has addition modification that it wants to make
560 to the flat device tree before handing it off to the kernel
564 This define fills in the correct boot CPU in the boot
565 param header, the default value is zero if undefined.
569 U-Boot can detect if an IDE device is present or not.
570 If not, and this new config option is activated, U-Boot
571 removes the ATA node from the DTS before booting Linux,
572 so the Linux IDE driver does not probe the device and
573 crash. This is needed for buggy hardware (uc101) where
574 no pull down resistor is connected to the signal IDE5V_DD7.
576 CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
578 This setting is mandatory for all boards that have only one
579 machine type and must be used to specify the machine type
580 number as it appears in the ARM machine registry
581 (see http://www.arm.linux.org.uk/developer/machines/).
582 Only boards that have multiple machine types supported
583 in a single configuration file and the machine type is
584 runtime discoverable, do not have to use this setting.
586 - vxWorks boot parameters:
588 bootvx constructs a valid bootline using the following
589 environments variables: bootfile, ipaddr, serverip, hostname.
590 It loads the vxWorks image pointed bootfile.
592 CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
593 CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
594 CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
595 CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
597 CONFIG_SYS_VXWORKS_ADD_PARAMS
599 Add it at the end of the bootline. E.g "u=username pw=secret"
601 Note: If a "bootargs" environment is defined, it will overwride
602 the defaults discussed just above.
604 - Cache Configuration:
605 CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
606 CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
607 CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
609 - Cache Configuration for ARM:
610 CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
612 CONFIG_SYS_PL310_BASE - Physical base address of PL310
613 controller register space
618 Define this if you want support for Amba PrimeCell PL010 UARTs.
622 Define this if you want support for Amba PrimeCell PL011 UARTs.
626 If you have Amba PrimeCell PL011 UARTs, set this variable to
627 the clock speed of the UARTs.
631 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
632 define this to a list of base addresses for each (supported)
633 port. See e.g. include/configs/versatile.h
635 CONFIG_PL011_SERIAL_RLCR
637 Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
638 have separate receive and transmit line control registers. Set
639 this variable to initialize the extra register.
641 CONFIG_PL011_SERIAL_FLUSH_ON_INIT
643 On some platforms (e.g. U8500) U-Boot is loaded by a second stage
644 boot loader that has already initialized the UART. Define this
645 variable to flush the UART at init time.
649 Depending on board, define exactly one serial port
650 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
651 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
652 console by defining CONFIG_8xx_CONS_NONE
654 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
655 port routines must be defined elsewhere
656 (i.e. serial_init(), serial_getc(), ...)
659 Enables console device for a color framebuffer. Needs following
660 defines (cf. smiLynxEM, i8042)
661 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
663 VIDEO_HW_RECTFILL graphic chip supports
666 VIDEO_HW_BITBLT graphic chip supports
667 bit-blit (cf. smiLynxEM)
668 VIDEO_VISIBLE_COLS visible pixel columns
670 VIDEO_VISIBLE_ROWS visible pixel rows
671 VIDEO_PIXEL_SIZE bytes per pixel
672 VIDEO_DATA_FORMAT graphic data format
673 (0-5, cf. cfb_console.c)
674 VIDEO_FB_ADRS framebuffer address
675 VIDEO_KBD_INIT_FCT keyboard int fct
676 (i.e. i8042_kbd_init())
677 VIDEO_TSTC_FCT test char fct
679 VIDEO_GETC_FCT get char fct
681 CONFIG_CONSOLE_CURSOR cursor drawing on/off
682 (requires blink timer
684 CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
685 CONFIG_CONSOLE_TIME display time/date info in
687 (requires CONFIG_CMD_DATE)
688 CONFIG_VIDEO_LOGO display Linux logo in
690 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
691 linux_logo.h for logo.
692 Requires CONFIG_VIDEO_LOGO
693 CONFIG_CONSOLE_EXTRA_INFO
694 additional board info beside
697 When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
698 a limited number of ANSI escape sequences (cursor control,
699 erase functions and limited graphics rendition control).
701 When CONFIG_CFB_CONSOLE is defined, video console is
702 default i/o. Serial console can be forced with
703 environment 'console=serial'.
705 When CONFIG_SILENT_CONSOLE is defined, all console
706 messages (by U-Boot and Linux!) can be silenced with
707 the "silent" environment variable. See
708 doc/README.silent for more information.
711 CONFIG_BAUDRATE - in bps
712 Select one of the baudrates listed in
713 CONFIG_SYS_BAUDRATE_TABLE, see below.
714 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
716 - Console Rx buffer length
717 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
718 the maximum receive buffer length for the SMC.
719 This option is actual only for 82xx and 8xx possible.
720 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
721 must be defined, to setup the maximum idle timeout for
724 - Pre-Console Buffer:
725 Prior to the console being initialised (i.e. serial UART
726 initialised etc) all console output is silently discarded.
727 Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
728 buffer any console messages prior to the console being
729 initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
730 bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
731 a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
732 bytes are output before the console is initialised, the
733 earlier bytes are discarded.
735 'Sane' compilers will generate smaller code if
736 CONFIG_PRE_CON_BUF_SZ is a power of 2
738 - Safe printf() functions
739 Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
740 the printf() functions. These are defined in
741 include/vsprintf.h and include snprintf(), vsnprintf() and
742 so on. Code size increase is approximately 300-500 bytes.
743 If this option is not given then these functions will
744 silently discard their buffer size argument - this means
745 you are not getting any overflow checking in this case.
747 - Boot Delay: CONFIG_BOOTDELAY - in seconds
748 Delay before automatically booting the default image;
749 set to -1 to disable autoboot.
750 set to -2 to autoboot with no delay and not check for abort
751 (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
753 See doc/README.autoboot for these options that
754 work with CONFIG_BOOTDELAY. None are required.
755 CONFIG_BOOT_RETRY_TIME
756 CONFIG_BOOT_RETRY_MIN
757 CONFIG_AUTOBOOT_KEYED
758 CONFIG_AUTOBOOT_PROMPT
759 CONFIG_AUTOBOOT_DELAY_STR
760 CONFIG_AUTOBOOT_STOP_STR
761 CONFIG_AUTOBOOT_DELAY_STR2
762 CONFIG_AUTOBOOT_STOP_STR2
763 CONFIG_ZERO_BOOTDELAY_CHECK
764 CONFIG_RESET_TO_RETRY
768 Only needed when CONFIG_BOOTDELAY is enabled;
769 define a command string that is automatically executed
770 when no character is read on the console interface
771 within "Boot Delay" after reset.
774 This can be used to pass arguments to the bootm
775 command. The value of CONFIG_BOOTARGS goes into the
776 environment value "bootargs".
778 CONFIG_RAMBOOT and CONFIG_NFSBOOT
779 The value of these goes into the environment as
780 "ramboot" and "nfsboot" respectively, and can be used
781 as a convenience, when switching between booting from
787 When this option is #defined, the existence of the
788 environment variable "preboot" will be checked
789 immediately before starting the CONFIG_BOOTDELAY
790 countdown and/or running the auto-boot command resp.
791 entering interactive mode.
793 This feature is especially useful when "preboot" is
794 automatically generated or modified. For an example
795 see the LWMON board specific code: here "preboot" is
796 modified when the user holds down a certain
797 combination of keys on the (special) keyboard when
800 - Serial Download Echo Mode:
802 If defined to 1, all characters received during a
803 serial download (using the "loads" command) are
804 echoed back. This might be needed by some terminal
805 emulations (like "cu"), but may as well just take
806 time on others. This setting #define's the initial
807 value of the "loads_echo" environment variable.
809 - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
811 Select one of the baudrates listed in
812 CONFIG_SYS_BAUDRATE_TABLE, see below.
815 Monitor commands can be included or excluded
816 from the build by using the #include files
817 <config_cmd_all.h> and #undef'ing unwanted
818 commands, or using <config_cmd_default.h>
819 and augmenting with additional #define's
822 The default command configuration includes all commands
823 except those marked below with a "*".
825 CONFIG_CMD_ASKENV * ask for env variable
826 CONFIG_CMD_BDI bdinfo
827 CONFIG_CMD_BEDBUG * Include BedBug Debugger
828 CONFIG_CMD_BMP * BMP support
829 CONFIG_CMD_BSP * Board specific commands
830 CONFIG_CMD_BOOTD bootd
831 CONFIG_CMD_CACHE * icache, dcache
832 CONFIG_CMD_CONSOLE coninfo
833 CONFIG_CMD_CRC32 * crc32
834 CONFIG_CMD_DATE * support for RTC, date/time...
835 CONFIG_CMD_DHCP * DHCP support
836 CONFIG_CMD_DIAG * Diagnostics
837 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
838 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
839 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
840 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
841 CONFIG_CMD_DTT * Digital Therm and Thermostat
842 CONFIG_CMD_ECHO echo arguments
843 CONFIG_CMD_EDITENV edit env variable
844 CONFIG_CMD_EEPROM * EEPROM read/write support
845 CONFIG_CMD_ELF * bootelf, bootvx
846 CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
847 CONFIG_CMD_ENV_FLAGS * display details about env flags
848 CONFIG_CMD_EXPORTENV * export the environment
849 CONFIG_CMD_EXT2 * ext2 command support
850 CONFIG_CMD_EXT4 * ext4 command support
851 CONFIG_CMD_SAVEENV saveenv
852 CONFIG_CMD_FDC * Floppy Disk Support
853 CONFIG_CMD_FAT * FAT command support
854 CONFIG_CMD_FDOS * Dos diskette Support
855 CONFIG_CMD_FLASH flinfo, erase, protect
856 CONFIG_CMD_FPGA FPGA device initialization support
857 CONFIG_CMD_FUSE * Device fuse support
858 CONFIG_CMD_GETTIME * Get time since boot
859 CONFIG_CMD_GO * the 'go' command (exec code)
860 CONFIG_CMD_GREPENV * search environment
861 CONFIG_CMD_HASH * calculate hash / digest
862 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
863 CONFIG_CMD_I2C * I2C serial bus support
864 CONFIG_CMD_IDE * IDE harddisk support
865 CONFIG_CMD_IMI iminfo
866 CONFIG_CMD_IMLS List all images found in NOR flash
867 CONFIG_CMD_IMLS_NAND * List all images found in NAND flash
868 CONFIG_CMD_IMMAP * IMMR dump support
869 CONFIG_CMD_IMPORTENV * import an environment
870 CONFIG_CMD_INI * import data from an ini file into the env
871 CONFIG_CMD_IRQ * irqinfo
872 CONFIG_CMD_ITEST Integer/string test of 2 values
873 CONFIG_CMD_JFFS2 * JFFS2 Support
874 CONFIG_CMD_KGDB * kgdb
875 CONFIG_CMD_LDRINFO * ldrinfo (display Blackfin loader)
876 CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration
878 CONFIG_CMD_LOADB loadb
879 CONFIG_CMD_LOADS loads
880 CONFIG_CMD_MD5SUM * print md5 message digest
881 (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
882 CONFIG_CMD_MEMINFO * Display detailed memory information
883 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
885 CONFIG_CMD_MEMTEST * mtest
886 CONFIG_CMD_MISC Misc functions like sleep etc
887 CONFIG_CMD_MMC * MMC memory mapped support
888 CONFIG_CMD_MII * MII utility commands
889 CONFIG_CMD_MTDPARTS * MTD partition support
890 CONFIG_CMD_NAND * NAND support
891 CONFIG_CMD_NET bootp, tftpboot, rarpboot
892 CONFIG_CMD_NFS NFS support
893 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
894 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
895 CONFIG_CMD_PCI * pciinfo
896 CONFIG_CMD_PCMCIA * PCMCIA support
897 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
899 CONFIG_CMD_PORTIO * Port I/O
900 CONFIG_CMD_READ * Read raw data from partition
901 CONFIG_CMD_REGINFO * Register dump
902 CONFIG_CMD_RUN run command in env variable
903 CONFIG_CMD_SANDBOX * sb command to access sandbox features
904 CONFIG_CMD_SAVES * save S record dump
905 CONFIG_CMD_SCSI * SCSI Support
906 CONFIG_CMD_SDRAM * print SDRAM configuration information
907 (requires CONFIG_CMD_I2C)
908 CONFIG_CMD_SETGETDCR Support for DCR Register access
910 CONFIG_CMD_SF * Read/write/erase SPI NOR flash
911 CONFIG_CMD_SHA1SUM * print sha1 memory digest
912 (requires CONFIG_CMD_MEMORY)
913 CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x
914 CONFIG_CMD_SOURCE "source" command Support
915 CONFIG_CMD_SPI * SPI serial bus support
916 CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
917 CONFIG_CMD_TFTPPUT * TFTP put command (upload)
918 CONFIG_CMD_TIME * run command and report execution time (ARM specific)
919 CONFIG_CMD_TIMER * access to the system tick timer
920 CONFIG_CMD_USB * USB support
921 CONFIG_CMD_CDP * Cisco Discover Protocol support
922 CONFIG_CMD_MFSL * Microblaze FSL support
923 CONFIG_CMD_XIMG Load part of Multi Image
926 EXAMPLE: If you want all functions except of network
927 support you can write:
929 #include "config_cmd_all.h"
930 #undef CONFIG_CMD_NET
933 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
935 Note: Don't enable the "icache" and "dcache" commands
936 (configuration option CONFIG_CMD_CACHE) unless you know
937 what you (and your U-Boot users) are doing. Data
938 cache cannot be enabled on systems like the 8xx or
939 8260 (where accesses to the IMMR region must be
940 uncached), and it cannot be disabled on all other
941 systems where we (mis-) use the data cache to hold an
942 initial stack and some data.
945 XXX - this list needs to get updated!
947 - Regular expression support:
949 If this variable is defined, U-Boot is linked against
950 the SLRE (Super Light Regular Expression) library,
951 which adds regex support to some commands, as for
952 example "env grep" and "setexpr".
956 If this variable is defined, U-Boot will use a device tree
957 to configure its devices, instead of relying on statically
958 compiled #defines in the board file. This option is
959 experimental and only available on a few boards. The device
960 tree is available in the global data as gd->fdt_blob.
962 U-Boot needs to get its device tree from somewhere. This can
963 be done using one of the two options below:
966 If this variable is defined, U-Boot will embed a device tree
967 binary in its image. This device tree file should be in the
968 board directory and called <soc>-<board>.dts. The binary file
969 is then picked up in board_init_f() and made available through
970 the global data structure as gd->blob.
973 If this variable is defined, U-Boot will build a device tree
974 binary. It will be called u-boot.dtb. Architecture-specific
975 code will locate it at run-time. Generally this works by:
977 cat u-boot.bin u-boot.dtb >image.bin
979 and in fact, U-Boot does this for you, creating a file called
980 u-boot-dtb.bin which is useful in the common case. You can
981 still use the individual files if you need something more
986 If this variable is defined, it enables watchdog
987 support for the SoC. There must be support in the SoC
988 specific code for a watchdog. For the 8xx and 8260
989 CPUs, the SIU Watchdog feature is enabled in the SYPCR
990 register. When supported for a specific SoC is
991 available, then no further board specific code should
995 When using a watchdog circuitry external to the used
996 SoC, then define this variable and provide board
997 specific code for the "hw_watchdog_reset" function.
1000 CONFIG_VERSION_VARIABLE
1001 If this variable is defined, an environment variable
1002 named "ver" is created by U-Boot showing the U-Boot
1003 version as printed by the "version" command.
1004 Any change to this variable will be reverted at the
1009 When CONFIG_CMD_DATE is selected, the type of the RTC
1010 has to be selected, too. Define exactly one of the
1013 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
1014 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
1015 CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC
1016 CONFIG_RTC_MC146818 - use MC146818 RTC
1017 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
1018 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
1019 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
1020 CONFIG_RTC_DS164x - use Dallas DS164x RTC
1021 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
1022 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
1023 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
1024 CONFIG_SYS_RV3029_TCR - enable trickle charger on
1027 Note that if the RTC uses I2C, then the I2C interface
1028 must also be configured. See I2C Support, below.
1031 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
1032 CONFIG_PCA953X_INFO - enable pca953x info command
1034 The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
1035 chip-ngpio pairs that tell the PCA953X driver the number of
1036 pins supported by a particular chip.
1038 Note that if the GPIO device uses I2C, then the I2C interface
1039 must also be configured. See I2C Support, below.
1041 - Timestamp Support:
1043 When CONFIG_TIMESTAMP is selected, the timestamp
1044 (date and time) of an image is printed by image
1045 commands like bootm or iminfo. This option is
1046 automatically enabled when you select CONFIG_CMD_DATE .
1048 - Partition Labels (disklabels) Supported:
1049 Zero or more of the following:
1050 CONFIG_MAC_PARTITION Apple's MacOS partition table.
1051 CONFIG_DOS_PARTITION MS Dos partition table, traditional on the
1052 Intel architecture, USB sticks, etc.
1053 CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc.
1054 CONFIG_EFI_PARTITION GPT partition table, common when EFI is the
1055 bootloader. Note 2TB partition limit; see
1057 CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
1059 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1060 CONFIG_CMD_SCSI) you must configure support for at
1061 least one non-MTD partition type as well.
1064 CONFIG_IDE_RESET_ROUTINE - this is defined in several
1065 board configurations files but used nowhere!
1067 CONFIG_IDE_RESET - is this is defined, IDE Reset will
1068 be performed by calling the function
1069 ide_set_reset(int reset)
1070 which has to be defined in a board specific file
1075 Set this to enable ATAPI support.
1080 Set this to enable support for disks larger than 137GB
1081 Also look at CONFIG_SYS_64BIT_LBA.
1082 Whithout these , LBA48 support uses 32bit variables and will 'only'
1083 support disks up to 2.1TB.
1085 CONFIG_SYS_64BIT_LBA:
1086 When enabled, makes the IDE subsystem use 64bit sector addresses.
1090 At the moment only there is only support for the
1091 SYM53C8XX SCSI controller; define
1092 CONFIG_SCSI_SYM53C8XX to enable it.
1094 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
1095 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
1096 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1097 maximum numbers of LUNs, SCSI ID's and target
1099 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1101 The environment variable 'scsidevs' is set to the number of
1102 SCSI devices found during the last scan.
1104 - NETWORK Support (PCI):
1106 Support for Intel 8254x/8257x gigabit chips.
1109 Utility code for direct access to the SPI bus on Intel 8257x.
1110 This does not do anything useful unless you set at least one
1111 of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1113 CONFIG_E1000_SPI_GENERIC
1114 Allow generic access to the SPI bus on the Intel 8257x, for
1115 example with the "sspi" command.
1118 Management command for E1000 devices. When used on devices
1119 with SPI support you can reprogram the EEPROM from U-Boot.
1121 CONFIG_E1000_FALLBACK_MAC
1122 default MAC for empty EEPROM after production.
1125 Support for Intel 82557/82559/82559ER chips.
1126 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1127 write routine for first time initialisation.
1130 Support for Digital 2114x chips.
1131 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1132 modem chip initialisation (KS8761/QS6611).
1135 Support for National dp83815 chips.
1138 Support for National dp8382[01] gigabit chips.
1140 - NETWORK Support (other):
1142 CONFIG_DRIVER_AT91EMAC
1143 Support for AT91RM9200 EMAC.
1146 Define this to use reduced MII inteface
1148 CONFIG_DRIVER_AT91EMAC_QUIET
1149 If this defined, the driver is quiet.
1150 The driver doen't show link status messages.
1152 CONFIG_CALXEDA_XGMAC
1153 Support for the Calxeda XGMAC device
1156 Support for SMSC's LAN91C96 chips.
1158 CONFIG_LAN91C96_BASE
1159 Define this to hold the physical address
1160 of the LAN91C96's I/O space
1162 CONFIG_LAN91C96_USE_32_BIT
1163 Define this to enable 32 bit addressing
1166 Support for SMSC's LAN91C111 chip
1168 CONFIG_SMC91111_BASE
1169 Define this to hold the physical address
1170 of the device (I/O space)
1172 CONFIG_SMC_USE_32_BIT
1173 Define this if data bus is 32 bits
1175 CONFIG_SMC_USE_IOFUNCS
1176 Define this to use i/o functions instead of macros
1177 (some hardware wont work with macros)
1179 CONFIG_DRIVER_TI_EMAC
1180 Support for davinci emac
1182 CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1183 Define this if you have more then 3 PHYs.
1186 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1188 CONFIG_FTGMAC100_EGIGA
1189 Define this to use GE link update with gigabit PHY.
1190 Define this if FTGMAC100 is connected to gigabit PHY.
1191 If your system has 10/100 PHY only, it might not occur
1192 wrong behavior. Because PHY usually return timeout or
1193 useless data when polling gigabit status and gigabit
1194 control registers. This behavior won't affect the
1195 correctnessof 10/100 link speed update.
1198 Support for SMSC's LAN911x and LAN921x chips
1201 Define this to hold the physical address
1202 of the device (I/O space)
1204 CONFIG_SMC911X_32_BIT
1205 Define this if data bus is 32 bits
1207 CONFIG_SMC911X_16_BIT
1208 Define this if data bus is 16 bits. If your processor
1209 automatically converts one 32 bit word to two 16 bit
1210 words you may also try CONFIG_SMC911X_32_BIT.
1213 Support for Renesas on-chip Ethernet controller
1215 CONFIG_SH_ETHER_USE_PORT
1216 Define the number of ports to be used
1218 CONFIG_SH_ETHER_PHY_ADDR
1219 Define the ETH PHY's address
1221 CONFIG_SH_ETHER_CACHE_WRITEBACK
1222 If this option is set, the driver enables cache flush.
1226 Support TPM devices.
1229 Support for i2c bus TPM devices. Only one device
1230 per system is supported at this time.
1232 CONFIG_TPM_TIS_I2C_BUS_NUMBER
1233 Define the the i2c bus number for the TPM device
1235 CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
1236 Define the TPM's address on the i2c bus
1238 CONFIG_TPM_TIS_I2C_BURST_LIMITATION
1239 Define the burst count bytes upper limit
1241 CONFIG_TPM_ATMEL_TWI
1242 Support for Atmel TWI TPM device. Requires I2C support.
1245 Support for generic parallel port TPM devices. Only one device
1246 per system is supported at this time.
1248 CONFIG_TPM_TIS_BASE_ADDRESS
1249 Base address where the generic TPM device is mapped
1250 to. Contemporary x86 systems usually map it at
1254 Add tpm monitor functions.
1255 Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
1256 provides monitor access to authorized functions.
1259 Define this to enable the TPM support library which provides
1260 functional interfaces to some TPM commands.
1261 Requires support for a TPM device.
1263 CONFIG_TPM_AUTH_SESSIONS
1264 Define this to enable authorized functions in the TPM library.
1265 Requires CONFIG_TPM and CONFIG_SHA1.
1268 At the moment only the UHCI host controller is
1269 supported (PIP405, MIP405, MPC5200); define
1270 CONFIG_USB_UHCI to enable it.
1271 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
1272 and define CONFIG_USB_STORAGE to enable the USB
1275 Supported are USB Keyboards and USB Floppy drives
1277 MPC5200 USB requires additional defines:
1279 for 528 MHz Clock: 0x0001bbbb
1283 for differential drivers: 0x00001000
1284 for single ended drivers: 0x00005000
1285 for differential drivers on PSC3: 0x00000100
1286 for single ended drivers on PSC3: 0x00004100
1287 CONFIG_SYS_USB_EVENT_POLL
1288 May be defined to allow interrupt polling
1289 instead of using asynchronous interrupts
1291 CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
1292 txfilltuning field in the EHCI controller on reset.
1294 CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
1295 interval for usb hub power-on delay.(minimum 100msec)
1298 Define the below if you wish to use the USB console.
1299 Once firmware is rebuilt from a serial console issue the
1300 command "setenv stdin usbtty; setenv stdout usbtty" and
1301 attach your USB cable. The Unix command "dmesg" should print
1302 it has found a new device. The environment variable usbtty
1303 can be set to gserial or cdc_acm to enable your device to
1304 appear to a USB host as a Linux gserial device or a
1305 Common Device Class Abstract Control Model serial device.
1306 If you select usbtty = gserial you should be able to enumerate
1308 # modprobe usbserial vendor=0xVendorID product=0xProductID
1309 else if using cdc_acm, simply setting the environment
1310 variable usbtty to be cdc_acm should suffice. The following
1311 might be defined in YourBoardName.h
1314 Define this to build a UDC device
1317 Define this to have a tty type of device available to
1318 talk to the UDC device
1321 Define this to enable the high speed support for usb
1322 device and usbtty. If this feature is enabled, a routine
1323 int is_usbd_high_speed(void)
1324 also needs to be defined by the driver to dynamically poll
1325 whether the enumeration has succeded at high speed or full
1328 CONFIG_SYS_CONSOLE_IS_IN_ENV
1329 Define this if you want stdin, stdout &/or stderr to
1333 CONFIG_SYS_USB_EXTC_CLK 0xBLAH
1334 Derive USB clock from external clock "blah"
1335 - CONFIG_SYS_USB_EXTC_CLK 0x02
1337 CONFIG_SYS_USB_BRG_CLK 0xBLAH
1338 Derive USB clock from brgclk
1339 - CONFIG_SYS_USB_BRG_CLK 0x04
1341 If you have a USB-IF assigned VendorID then you may wish to
1342 define your own vendor specific values either in BoardName.h
1343 or directly in usbd_vendor_info.h. If you don't define
1344 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
1345 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
1346 should pretend to be a Linux device to it's target host.
1348 CONFIG_USBD_MANUFACTURER
1349 Define this string as the name of your company for
1350 - CONFIG_USBD_MANUFACTURER "my company"
1352 CONFIG_USBD_PRODUCT_NAME
1353 Define this string as the name of your product
1354 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
1356 CONFIG_USBD_VENDORID
1357 Define this as your assigned Vendor ID from the USB
1358 Implementors Forum. This *must* be a genuine Vendor ID
1359 to avoid polluting the USB namespace.
1360 - CONFIG_USBD_VENDORID 0xFFFF
1362 CONFIG_USBD_PRODUCTID
1363 Define this as the unique Product ID
1365 - CONFIG_USBD_PRODUCTID 0xFFFF
1367 - ULPI Layer Support:
1368 The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1369 the generic ULPI layer. The generic layer accesses the ULPI PHY
1370 via the platform viewport, so you need both the genric layer and
1371 the viewport enabled. Currently only Chipidea/ARC based
1372 viewport is supported.
1373 To enable the ULPI layer support, define CONFIG_USB_ULPI and
1374 CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
1375 If your ULPI phy needs a different reference clock than the
1376 standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
1377 the appropriate value in Hz.
1380 The MMC controller on the Intel PXA is supported. To
1381 enable this define CONFIG_MMC. The MMC can be
1382 accessed from the boot prompt by mapping the device
1383 to physical memory similar to flash. Command line is
1384 enabled with CONFIG_CMD_MMC. The MMC driver also works with
1385 the FAT fs. This is enabled with CONFIG_CMD_FAT.
1388 Support for Renesas on-chip MMCIF controller
1390 CONFIG_SH_MMCIF_ADDR
1391 Define the base address of MMCIF registers
1394 Define the clock frequency for MMCIF
1396 - USB Device Firmware Update (DFU) class support:
1398 This enables the USB portion of the DFU USB class
1401 This enables the command "dfu" which is used to have
1402 U-Boot create a DFU class device via USB. This command
1403 requires that the "dfu_alt_info" environment variable be
1404 set and define the alt settings to expose to the host.
1407 This enables support for exposing (e)MMC devices via DFU.
1410 This enables support for exposing NAND devices via DFU.
1412 CONFIG_SYS_DFU_DATA_BUF_SIZE
1413 Dfu transfer uses a buffer before writing data to the
1414 raw storage device. Make the size (in bytes) of this buffer
1415 configurable. The size of this buffer is also configurable
1416 through the "dfu_bufsiz" environment variable.
1418 CONFIG_SYS_DFU_MAX_FILE_SIZE
1419 When updating files rather than the raw storage device,
1420 we use a static buffer to copy the file into and then write
1421 the buffer once we've been given the whole file. Define
1422 this to the maximum filesize (in bytes) for the buffer.
1423 Default is 4 MiB if undefined.
1425 - Journaling Flash filesystem support:
1426 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
1427 CONFIG_JFFS2_NAND_DEV
1428 Define these for a default partition on a NAND device
1430 CONFIG_SYS_JFFS2_FIRST_SECTOR,
1431 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
1432 Define these for a default partition on a NOR device
1434 CONFIG_SYS_JFFS_CUSTOM_PART
1435 Define this to create an own partition. You have to provide a
1436 function struct part_info* jffs2_part_info(int part_num)
1438 If you define only one JFFS2 partition you may also want to
1439 #define CONFIG_SYS_JFFS_SINGLE_PART 1
1440 to disable the command chpart. This is the default when you
1441 have not defined a custom partition
1443 - FAT(File Allocation Table) filesystem write function support:
1446 Define this to enable support for saving memory data as a
1447 file in FAT formatted partition.
1449 This will also enable the command "fatwrite" enabling the
1450 user to write files to FAT.
1452 CBFS (Coreboot Filesystem) support
1455 Define this to enable support for reading from a Coreboot
1456 filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
1462 Define this to enable standard (PC-Style) keyboard
1466 Standard PC keyboard driver with US (is default) and
1467 GERMAN key layout (switch via environment 'keymap=de') support.
1468 Export function i8042_kbd_init, i8042_tstc and i8042_getc
1469 for cfb_console. Supports cursor blinking.
1472 Enables a Chrome OS keyboard using the CROS_EC interface.
1473 This uses CROS_EC to communicate with a second microcontroller
1474 which provides key scans on request.
1479 Define this to enable video support (for output to
1482 CONFIG_VIDEO_CT69000
1484 Enable Chips & Technologies 69000 Video chip
1486 CONFIG_VIDEO_SMI_LYNXEM
1487 Enable Silicon Motion SMI 712/710/810 Video chip. The
1488 video output is selected via environment 'videoout'
1489 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1492 For the CT69000 and SMI_LYNXEM drivers, videomode is
1493 selected via environment 'videomode'. Two different ways
1495 - "videomode=num" 'num' is a standard LiLo mode numbers.
1496 Following standard modes are supported (* is default):
1498 Colors 640x480 800x600 1024x768 1152x864 1280x1024
1499 -------------+---------------------------------------------
1500 8 bits | 0x301* 0x303 0x305 0x161 0x307
1501 15 bits | 0x310 0x313 0x316 0x162 0x319
1502 16 bits | 0x311 0x314 0x317 0x163 0x31A
1503 24 bits | 0x312 0x315 0x318 ? 0x31B
1504 -------------+---------------------------------------------
1505 (i.e. setenv videomode 317; saveenv; reset;)
1507 - "videomode=bootargs" all the video parameters are parsed
1508 from the bootargs. (See drivers/video/videomodes.c)
1511 CONFIG_VIDEO_SED13806
1512 Enable Epson SED13806 driver. This driver supports 8bpp
1513 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1514 or CONFIG_VIDEO_SED13806_16BPP
1517 Enable the Freescale DIU video driver. Reference boards for
1518 SOCs that have a DIU should define this macro to enable DIU
1519 support, and should also define these other macros:
1525 CONFIG_VIDEO_SW_CURSOR
1526 CONFIG_VGA_AS_SINGLE_DEVICE
1528 CONFIG_VIDEO_BMP_LOGO
1530 The DIU driver will look for the 'video-mode' environment
1531 variable, and if defined, enable the DIU as a console during
1532 boot. See the documentation file README.video for a
1533 description of this variable.
1537 Enable the VGA video / BIOS for x86. The alternative if you
1538 are using coreboot is to use the coreboot frame buffer
1545 Define this to enable a custom keyboard support.
1546 This simply calls drv_keyboard_init() which must be
1547 defined in your board-specific files.
1548 The only board using this so far is RBC823.
1550 - LCD Support: CONFIG_LCD
1552 Define this to enable LCD support (for output to LCD
1553 display); also select one of the supported displays
1554 by defining one of these:
1558 HITACHI TX09D70VM1CCA, 3.5", 240x320.
1560 CONFIG_NEC_NL6448AC33:
1562 NEC NL6448AC33-18. Active, color, single scan.
1564 CONFIG_NEC_NL6448BC20
1566 NEC NL6448BC20-08. 6.5", 640x480.
1567 Active, color, single scan.
1569 CONFIG_NEC_NL6448BC33_54
1571 NEC NL6448BC33-54. 10.4", 640x480.
1572 Active, color, single scan.
1576 Sharp 320x240. Active, color, single scan.
1577 It isn't 16x9, and I am not sure what it is.
1579 CONFIG_SHARP_LQ64D341
1581 Sharp LQ64D341 display, 640x480.
1582 Active, color, single scan.
1586 HLD1045 display, 640x480.
1587 Active, color, single scan.
1591 Optrex CBL50840-2 NF-FW 99 22 M5
1593 Hitachi LMG6912RPFC-00T
1597 320x240. Black & white.
1599 Normally display is black on white background; define
1600 CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1602 CONFIG_LCD_ALIGNMENT
1604 Normally the LCD is page-aligned (tyically 4KB). If this is
1605 defined then the LCD will be aligned to this value instead.
1606 For ARM it is sometimes useful to use MMU_SECTION_SIZE
1607 here, since it is cheaper to change data cache settings on
1608 a per-section basis.
1610 CONFIG_CONSOLE_SCROLL_LINES
1612 When the console need to be scrolled, this is the number of
1613 lines to scroll by. It defaults to 1. Increasing this makes
1614 the console jump but can help speed up operation when scrolling
1619 Support drawing of RLE8-compressed bitmaps on the LCD.
1623 Enables an 'i2c edid' command which can read EDID
1624 information over I2C from an attached LCD display.
1626 - Splash Screen Support: CONFIG_SPLASH_SCREEN
1628 If this option is set, the environment is checked for
1629 a variable "splashimage". If found, the usual display
1630 of logo, copyright and system information on the LCD
1631 is suppressed and the BMP image at the address
1632 specified in "splashimage" is loaded instead. The
1633 console is redirected to the "nulldev", too. This
1634 allows for a "silent" boot where a splash screen is
1635 loaded very quickly after power-on.
1637 CONFIG_SPLASHIMAGE_GUARD
1639 If this option is set, then U-Boot will prevent the environment
1640 variable "splashimage" from being set to a problematic address
1641 (see README.displaying-bmps and README.arm-unaligned-accesses).
1642 This option is useful for targets where, due to alignment
1643 restrictions, an improperly aligned BMP image will cause a data
1644 abort. If you think you will not have problems with unaligned
1645 accesses (for example because your toolchain prevents them)
1646 there is no need to set this option.
1648 CONFIG_SPLASH_SCREEN_ALIGN
1650 If this option is set the splash image can be freely positioned
1651 on the screen. Environment variable "splashpos" specifies the
1652 position as "x,y". If a positive number is given it is used as
1653 number of pixel from left/top. If a negative number is given it
1654 is used as number of pixel from right/bottom. You can also
1655 specify 'm' for centering the image.
1658 setenv splashpos m,m
1659 => image at center of screen
1661 setenv splashpos 30,20
1662 => image at x = 30 and y = 20
1664 setenv splashpos -10,m
1665 => vertically centered image
1666 at x = dspWidth - bmpWidth - 9
1668 - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1670 If this option is set, additionally to standard BMP
1671 images, gzipped BMP images can be displayed via the
1672 splashscreen support or the bmp command.
1674 - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1676 If this option is set, 8-bit RLE compressed BMP images
1677 can be displayed via the splashscreen support or the
1680 - Do compresssing for memory range:
1683 If this option is set, it would use zlib deflate method
1684 to compress the specified memory at its best effort.
1686 - Compression support:
1689 Enabled by default to support gzip compressed images.
1693 If this option is set, support for bzip2 compressed
1694 images is included. If not, only uncompressed and gzip
1695 compressed images are supported.
1697 NOTE: the bzip2 algorithm requires a lot of RAM, so
1698 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1703 If this option is set, support for lzma compressed
1706 Note: The LZMA algorithm adds between 2 and 4KB of code and it
1707 requires an amount of dynamic memory that is given by the
1710 (1846 + 768 << (lc + lp)) * sizeof(uint16)
1712 Where lc and lp stand for, respectively, Literal context bits
1713 and Literal pos bits.
1715 This value is upper-bounded by 14MB in the worst case. Anyway,
1716 for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1717 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1718 a very small buffer.
1720 Use the lzmainfo tool to determinate the lc and lp values and
1721 then calculate the amount of needed dynamic memory (ensuring
1722 the appropriate CONFIG_SYS_MALLOC_LEN value).
1726 If this option is set, support for LZO compressed images
1732 The address of PHY on MII bus.
1734 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1736 The clock frequency of the MII bus
1740 If this option is set, support for speed/duplex
1741 detection of gigabit PHY is included.
1743 CONFIG_PHY_RESET_DELAY
1745 Some PHY like Intel LXT971A need extra delay after
1746 reset before any MII register access is possible.
1747 For such PHY, set this option to the usec delay
1748 required. (minimum 300usec for LXT971A)
1750 CONFIG_PHY_CMD_DELAY (ppc4xx)
1752 Some PHY like Intel LXT971A need extra delay after
1753 command issued before MII status register can be read
1763 Define a default value for Ethernet address to use
1764 for the respective Ethernet interface, in case this
1765 is not determined automatically.
1770 Define a default value for the IP address to use for
1771 the default Ethernet interface, in case this is not
1772 determined through e.g. bootp.
1773 (Environment variable "ipaddr")
1775 - Server IP address:
1778 Defines a default value for the IP address of a TFTP
1779 server to contact when using the "tftboot" command.
1780 (Environment variable "serverip")
1782 CONFIG_KEEP_SERVERADDR
1784 Keeps the server's MAC address, in the env 'serveraddr'
1785 for passing to bootargs (like Linux's netconsole option)
1787 - Gateway IP address:
1790 Defines a default value for the IP address of the
1791 default router where packets to other networks are
1793 (Environment variable "gatewayip")
1798 Defines a default value for the subnet mask (or
1799 routing prefix) which is used to determine if an IP
1800 address belongs to the local subnet or needs to be
1801 forwarded through a router.
1802 (Environment variable "netmask")
1804 - Multicast TFTP Mode:
1807 Defines whether you want to support multicast TFTP as per
1808 rfc-2090; for example to work with atftp. Lets lots of targets
1809 tftp down the same boot image concurrently. Note: the Ethernet
1810 driver in use must provide a function: mcast() to join/leave a
1813 - BOOTP Recovery Mode:
1814 CONFIG_BOOTP_RANDOM_DELAY
1816 If you have many targets in a network that try to
1817 boot using BOOTP, you may want to avoid that all
1818 systems send out BOOTP requests at precisely the same
1819 moment (which would happen for instance at recovery
1820 from a power failure, when all systems will try to
1821 boot, thus flooding the BOOTP server. Defining
1822 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1823 inserted before sending out BOOTP requests. The
1824 following delays are inserted then:
1826 1st BOOTP request: delay 0 ... 1 sec
1827 2nd BOOTP request: delay 0 ... 2 sec
1828 3rd BOOTP request: delay 0 ... 4 sec
1830 BOOTP requests: delay 0 ... 8 sec
1832 - DHCP Advanced Options:
1833 You can fine tune the DHCP functionality by defining
1834 CONFIG_BOOTP_* symbols:
1836 CONFIG_BOOTP_SUBNETMASK
1837 CONFIG_BOOTP_GATEWAY
1838 CONFIG_BOOTP_HOSTNAME
1839 CONFIG_BOOTP_NISDOMAIN
1840 CONFIG_BOOTP_BOOTPATH
1841 CONFIG_BOOTP_BOOTFILESIZE
1844 CONFIG_BOOTP_SEND_HOSTNAME
1845 CONFIG_BOOTP_NTPSERVER
1846 CONFIG_BOOTP_TIMEOFFSET
1847 CONFIG_BOOTP_VENDOREX
1848 CONFIG_BOOTP_MAY_FAIL
1850 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1851 environment variable, not the BOOTP server.
1853 CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
1854 after the configured retry count, the call will fail
1855 instead of starting over. This can be used to fail over
1856 to Link-local IP address configuration if the DHCP server
1859 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1860 serverip from a DHCP server, it is possible that more
1861 than one DNS serverip is offered to the client.
1862 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1863 serverip will be stored in the additional environment
1864 variable "dnsip2". The first DNS serverip is always
1865 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
1868 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1869 to do a dynamic update of a DNS server. To do this, they
1870 need the hostname of the DHCP requester.
1871 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
1872 of the "hostname" environment variable is passed as
1873 option 12 to the DHCP server.
1875 CONFIG_BOOTP_DHCP_REQUEST_DELAY
1877 A 32bit value in microseconds for a delay between
1878 receiving a "DHCP Offer" and sending the "DHCP Request".
1879 This fixes a problem with certain DHCP servers that don't
1880 respond 100% of the time to a "DHCP request". E.g. On an
1881 AT91RM9200 processor running at 180MHz, this delay needed
1882 to be *at least* 15,000 usec before a Windows Server 2003
1883 DHCP server would reply 100% of the time. I recommend at
1884 least 50,000 usec to be safe. The alternative is to hope
1885 that one of the retries will be successful but note that
1886 the DHCP timeout and retry process takes a longer than
1889 - Link-local IP address negotiation:
1890 Negotiate with other link-local clients on the local network
1891 for an address that doesn't require explicit configuration.
1892 This is especially useful if a DHCP server cannot be guaranteed
1893 to exist in all environments that the device must operate.
1895 See doc/README.link-local for more information.
1898 CONFIG_CDP_DEVICE_ID
1900 The device id used in CDP trigger frames.
1902 CONFIG_CDP_DEVICE_ID_PREFIX
1904 A two character string which is prefixed to the MAC address
1909 A printf format string which contains the ascii name of
1910 the port. Normally is set to "eth%d" which sets
1911 eth0 for the first Ethernet, eth1 for the second etc.
1913 CONFIG_CDP_CAPABILITIES
1915 A 32bit integer which indicates the device capabilities;
1916 0x00000010 for a normal host which does not forwards.
1920 An ascii string containing the version of the software.
1924 An ascii string containing the name of the platform.
1928 A 32bit integer sent on the trigger.
1930 CONFIG_CDP_POWER_CONSUMPTION
1932 A 16bit integer containing the power consumption of the
1933 device in .1 of milliwatts.
1935 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1937 A byte containing the id of the VLAN.
1939 - Status LED: CONFIG_STATUS_LED
1941 Several configurations allow to display the current
1942 status using a LED. For instance, the LED will blink
1943 fast while running U-Boot code, stop blinking as
1944 soon as a reply to a BOOTP request was received, and
1945 start blinking slow once the Linux kernel is running
1946 (supported by a status LED driver in the Linux
1947 kernel). Defining CONFIG_STATUS_LED enables this
1950 - CAN Support: CONFIG_CAN_DRIVER
1952 Defining CONFIG_CAN_DRIVER enables CAN driver support
1953 on those systems that support this (optional)
1954 feature, like the TQM8xxL modules.
1956 - I2C Support: CONFIG_SYS_I2C
1958 This enable the NEW i2c subsystem, and will allow you to use
1959 i2c commands at the u-boot command line (as long as you set
1960 CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
1961 based realtime clock chips or other i2c devices. See
1962 common/cmd_i2c.c for a description of the command line
1965 ported i2c driver to the new framework:
1966 - drivers/i2c/soft_i2c.c:
1967 - activate first bus with CONFIG_SYS_I2C_SOFT define
1968 CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
1969 for defining speed and slave address
1970 - activate second bus with I2C_SOFT_DECLARATIONS2 define
1971 CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
1972 for defining speed and slave address
1973 - activate third bus with I2C_SOFT_DECLARATIONS3 define
1974 CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
1975 for defining speed and slave address
1976 - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
1977 CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
1978 for defining speed and slave address
1980 - drivers/i2c/fsl_i2c.c:
1981 - activate i2c driver with CONFIG_SYS_I2C_FSL
1982 define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
1983 offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
1984 CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
1986 - If your board supports a second fsl i2c bus, define
1987 CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
1988 CONFIG_SYS_FSL_I2C2_SPEED for the speed and
1989 CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
1992 - drivers/i2c/tegra_i2c.c:
1993 - activate this driver with CONFIG_SYS_I2C_TEGRA
1994 - This driver adds 4 i2c buses with a fix speed from
1995 100000 and the slave addr 0!
1997 - drivers/i2c/ppc4xx_i2c.c
1998 - activate this driver with CONFIG_SYS_I2C_PPC4XX
1999 - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
2000 - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
2004 CONFIG_SYS_NUM_I2C_BUSES
2005 Hold the number of i2c busses you want to use. If you
2006 don't use/have i2c muxes on your i2c bus, this
2007 is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
2010 CONFIG_SYS_I2C_DIRECT_BUS
2011 define this, if you don't use i2c muxes on your hardware.
2012 if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
2015 CONFIG_SYS_I2C_MAX_HOPS
2016 define how many muxes are maximal consecutively connected
2017 on one i2c bus. If you not use i2c muxes, omit this
2020 CONFIG_SYS_I2C_BUSES
2021 hold a list of busses you want to use, only used if
2022 CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
2023 a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
2024 CONFIG_SYS_NUM_I2C_BUSES = 9:
2026 CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \
2027 {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
2028 {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
2029 {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
2030 {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
2031 {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
2032 {1, {I2C_NULL_HOP}}, \
2033 {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
2034 {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
2038 bus 0 on adapter 0 without a mux
2039 bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
2040 bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
2041 bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
2042 bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
2043 bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
2044 bus 6 on adapter 1 without a mux
2045 bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
2046 bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
2048 If you do not have i2c muxes on your board, omit this define.
2050 - Legacy I2C Support: CONFIG_HARD_I2C
2052 NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
2053 provides the following compelling advantages:
2055 - more than one i2c adapter is usable
2056 - approved multibus support
2057 - better i2c mux support
2059 ** Please consider updating your I2C driver now. **
2061 These enable legacy I2C serial bus commands. Defining
2062 CONFIG_HARD_I2C will include the appropriate I2C driver
2063 for the selected CPU.
2065 This will allow you to use i2c commands at the u-boot
2066 command line (as long as you set CONFIG_CMD_I2C in
2067 CONFIG_COMMANDS) and communicate with i2c based realtime
2068 clock chips. See common/cmd_i2c.c for a description of the
2069 command line interface.
2071 CONFIG_HARD_I2C selects a hardware I2C controller.
2073 There are several other quantities that must also be
2074 defined when you define CONFIG_HARD_I2C.
2076 In both cases you will need to define CONFIG_SYS_I2C_SPEED
2077 to be the frequency (in Hz) at which you wish your i2c bus
2078 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
2079 the CPU's i2c node address).
2081 Now, the u-boot i2c code for the mpc8xx
2082 (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
2083 and so its address should therefore be cleared to 0 (See,
2084 eg, MPC823e User's Manual p.16-473). So, set
2085 CONFIG_SYS_I2C_SLAVE to 0.
2087 CONFIG_SYS_I2C_INIT_MPC5XXX
2089 When a board is reset during an i2c bus transfer
2090 chips might think that the current transfer is still
2091 in progress. Reset the slave devices by sending start
2092 commands until the slave device responds.
2094 That's all that's required for CONFIG_HARD_I2C.
2096 If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
2097 then the following macros need to be defined (examples are
2098 from include/configs/lwmon.h):
2102 (Optional). Any commands necessary to enable the I2C
2103 controller or configure ports.
2105 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
2109 (Only for MPC8260 CPU). The I/O port to use (the code
2110 assumes both bits are on the same port). Valid values
2111 are 0..3 for ports A..D.
2115 The code necessary to make the I2C data line active
2116 (driven). If the data line is open collector, this
2119 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
2123 The code necessary to make the I2C data line tri-stated
2124 (inactive). If the data line is open collector, this
2127 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2131 Code that returns true if the I2C data line is high,
2134 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2138 If <bit> is true, sets the I2C data line high. If it
2139 is false, it clears it (low).
2141 eg: #define I2C_SDA(bit) \
2142 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
2143 else immr->im_cpm.cp_pbdat &= ~PB_SDA
2147 If <bit> is true, sets the I2C clock line high. If it
2148 is false, it clears it (low).
2150 eg: #define I2C_SCL(bit) \
2151 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
2152 else immr->im_cpm.cp_pbdat &= ~PB_SCL
2156 This delay is invoked four times per clock cycle so this
2157 controls the rate of data transfer. The data rate thus
2158 is 1 / (I2C_DELAY * 4). Often defined to be something
2161 #define I2C_DELAY udelay(2)
2163 CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2165 If your arch supports the generic GPIO framework (asm/gpio.h),
2166 then you may alternatively define the two GPIOs that are to be
2167 used as SCL / SDA. Any of the previous I2C_xxx macros will
2168 have GPIO-based defaults assigned to them as appropriate.
2170 You should define these to the GPIO value as given directly to
2171 the generic GPIO functions.
2173 CONFIG_SYS_I2C_INIT_BOARD
2175 When a board is reset during an i2c bus transfer
2176 chips might think that the current transfer is still
2177 in progress. On some boards it is possible to access
2178 the i2c SCLK line directly, either by using the
2179 processor pin as a GPIO or by having a second pin
2180 connected to the bus. If this option is defined a
2181 custom i2c_init_board() routine in boards/xxx/board.c
2182 is run early in the boot sequence.
2184 CONFIG_SYS_I2C_BOARD_LATE_INIT
2186 An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
2187 defined a custom i2c_board_late_init() routine in
2188 boards/xxx/board.c is run AFTER the operations in i2c_init()
2189 is completed. This callpoint can be used to unreset i2c bus
2190 using CPU i2c controller register accesses for CPUs whose i2c
2191 controller provide such a method. It is called at the end of
2192 i2c_init() to allow i2c_init operations to setup the i2c bus
2193 controller on the CPU (e.g. setting bus speed & slave address).
2195 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
2197 This option enables configuration of bi_iic_fast[] flags
2198 in u-boot bd_info structure based on u-boot environment
2199 variable "i2cfast". (see also i2cfast)
2201 CONFIG_I2C_MULTI_BUS
2203 This option allows the use of multiple I2C buses, each of which
2204 must have a controller. At any point in time, only one bus is
2205 active. To switch to a different bus, use the 'i2c dev' command.
2206 Note that bus numbering is zero-based.
2208 CONFIG_SYS_I2C_NOPROBES
2210 This option specifies a list of I2C devices that will be skipped
2211 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
2212 is set, specify a list of bus-device pairs. Otherwise, specify
2213 a 1D array of device addresses
2216 #undef CONFIG_I2C_MULTI_BUS
2217 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2219 will skip addresses 0x50 and 0x68 on a board with one I2C bus
2221 #define CONFIG_I2C_MULTI_BUS
2222 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
2224 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2226 CONFIG_SYS_SPD_BUS_NUM
2228 If defined, then this indicates the I2C bus number for DDR SPD.
2229 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2231 CONFIG_SYS_RTC_BUS_NUM
2233 If defined, then this indicates the I2C bus number for the RTC.
2234 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
2236 CONFIG_SYS_DTT_BUS_NUM
2238 If defined, then this indicates the I2C bus number for the DTT.
2239 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
2241 CONFIG_SYS_I2C_DTT_ADDR:
2243 If defined, specifies the I2C address of the DTT device.
2244 If not defined, then U-Boot uses predefined value for
2245 specified DTT device.
2247 CONFIG_SOFT_I2C_READ_REPEATED_START
2249 defining this will force the i2c_read() function in
2250 the soft_i2c driver to perform an I2C repeated start
2251 between writing the address pointer and reading the
2252 data. If this define is omitted the default behaviour
2253 of doing a stop-start sequence will be used. Most I2C
2254 devices can use either method, but some require one or
2257 - SPI Support: CONFIG_SPI
2259 Enables SPI driver (so far only tested with
2260 SPI EEPROM, also an instance works with Crystal A/D and
2261 D/As on the SACSng board)
2265 Enables the driver for SPI controller on SuperH. Currently
2266 only SH7757 is supported.
2270 Enables extended (16-bit) SPI EEPROM addressing.
2271 (symmetrical to CONFIG_I2C_X)
2275 Enables a software (bit-bang) SPI driver rather than
2276 using hardware support. This is a general purpose
2277 driver that only requires three general I/O port pins
2278 (two outputs, one input) to function. If this is
2279 defined, the board configuration must define several
2280 SPI configuration items (port pins to use, etc). For
2281 an example, see include/configs/sacsng.h.
2285 Enables a hardware SPI driver for general-purpose reads
2286 and writes. As with CONFIG_SOFT_SPI, the board configuration
2287 must define a list of chip-select function pointers.
2288 Currently supported on some MPC8xxx processors. For an
2289 example, see include/configs/mpc8349emds.h.
2293 Enables the driver for the SPI controllers on i.MX and MXC
2294 SoCs. Currently i.MX31/35/51 are supported.
2296 - FPGA Support: CONFIG_FPGA
2298 Enables FPGA subsystem.
2300 CONFIG_FPGA_<vendor>
2302 Enables support for specific chip vendors.
2305 CONFIG_FPGA_<family>
2307 Enables support for FPGA family.
2308 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
2312 Specify the number of FPGA devices to support.
2314 CONFIG_SYS_FPGA_PROG_FEEDBACK
2316 Enable printing of hash marks during FPGA configuration.
2318 CONFIG_SYS_FPGA_CHECK_BUSY
2320 Enable checks on FPGA configuration interface busy
2321 status by the configuration function. This option
2322 will require a board or device specific function to
2327 If defined, a function that provides delays in the FPGA
2328 configuration driver.
2330 CONFIG_SYS_FPGA_CHECK_CTRLC
2331 Allow Control-C to interrupt FPGA configuration
2333 CONFIG_SYS_FPGA_CHECK_ERROR
2335 Check for configuration errors during FPGA bitfile
2336 loading. For example, abort during Virtex II
2337 configuration if the INIT_B line goes low (which
2338 indicated a CRC error).
2340 CONFIG_SYS_FPGA_WAIT_INIT
2342 Maximum time to wait for the INIT_B line to deassert
2343 after PROB_B has been deasserted during a Virtex II
2344 FPGA configuration sequence. The default time is 500
2347 CONFIG_SYS_FPGA_WAIT_BUSY
2349 Maximum time to wait for BUSY to deassert during
2350 Virtex II FPGA configuration. The default is 5 ms.
2352 CONFIG_SYS_FPGA_WAIT_CONFIG
2354 Time to wait after FPGA configuration. The default is
2357 - Configuration Management:
2360 If defined, this string will be added to the U-Boot
2361 version information (U_BOOT_VERSION)
2363 - Vendor Parameter Protection:
2365 U-Boot considers the values of the environment
2366 variables "serial#" (Board Serial Number) and
2367 "ethaddr" (Ethernet Address) to be parameters that
2368 are set once by the board vendor / manufacturer, and
2369 protects these variables from casual modification by
2370 the user. Once set, these variables are read-only,
2371 and write or delete attempts are rejected. You can
2372 change this behaviour:
2374 If CONFIG_ENV_OVERWRITE is #defined in your config
2375 file, the write protection for vendor parameters is
2376 completely disabled. Anybody can change or delete
2379 Alternatively, if you #define _both_ CONFIG_ETHADDR
2380 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
2381 Ethernet address is installed in the environment,
2382 which can be changed exactly ONCE by the user. [The
2383 serial# is unaffected by this, i. e. it remains
2386 The same can be accomplished in a more flexible way
2387 for any variable by configuring the type of access
2388 to allow for those variables in the ".flags" variable
2389 or define CONFIG_ENV_FLAGS_LIST_STATIC.
2394 Define this variable to enable the reservation of
2395 "protected RAM", i. e. RAM which is not overwritten
2396 by U-Boot. Define CONFIG_PRAM to hold the number of
2397 kB you want to reserve for pRAM. You can overwrite
2398 this default value by defining an environment
2399 variable "pram" to the number of kB you want to
2400 reserve. Note that the board info structure will
2401 still show the full amount of RAM. If pRAM is
2402 reserved, a new environment variable "mem" will
2403 automatically be defined to hold the amount of
2404 remaining RAM in a form that can be passed as boot
2405 argument to Linux, for instance like that:
2407 setenv bootargs ... mem=\${mem}
2410 This way you can tell Linux not to use this memory,
2411 either, which results in a memory region that will
2412 not be affected by reboots.
2414 *WARNING* If your board configuration uses automatic
2415 detection of the RAM size, you must make sure that
2416 this memory test is non-destructive. So far, the
2417 following board configurations are known to be
2420 IVMS8, IVML24, SPD8xx, TQM8xxL,
2421 HERMES, IP860, RPXlite, LWMON,
2424 - Access to physical memory region (> 4GB)
2425 Some basic support is provided for operations on memory not
2426 normally accessible to U-Boot - e.g. some architectures
2427 support access to more than 4GB of memory on 32-bit
2428 machines using physical address extension or similar.
2429 Define CONFIG_PHYSMEM to access this basic support, which
2430 currently only supports clearing the memory.
2435 Define this variable to stop the system in case of a
2436 fatal error, so that you have to reset it manually.
2437 This is probably NOT a good idea for an embedded
2438 system where you want the system to reboot
2439 automatically as fast as possible, but it may be
2440 useful during development since you can try to debug
2441 the conditions that lead to the situation.
2443 CONFIG_NET_RETRY_COUNT
2445 This variable defines the number of retries for
2446 network operations like ARP, RARP, TFTP, or BOOTP
2447 before giving up the operation. If not defined, a
2448 default value of 5 is used.
2452 Timeout waiting for an ARP reply in milliseconds.
2456 Timeout in milliseconds used in NFS protocol.
2457 If you encounter "ERROR: Cannot umount" in nfs command,
2458 try longer timeout such as
2459 #define CONFIG_NFS_TIMEOUT 10000UL
2461 - Command Interpreter:
2462 CONFIG_AUTO_COMPLETE
2464 Enable auto completion of commands using TAB.
2466 Note that this feature has NOT been implemented yet
2467 for the "hush" shell.
2470 CONFIG_SYS_HUSH_PARSER
2472 Define this variable to enable the "hush" shell (from
2473 Busybox) as command line interpreter, thus enabling
2474 powerful command line syntax like
2475 if...then...else...fi conditionals or `&&' and '||'
2476 constructs ("shell scripts").
2478 If undefined, you get the old, much simpler behaviour
2479 with a somewhat smaller memory footprint.
2482 CONFIG_SYS_PROMPT_HUSH_PS2
2484 This defines the secondary prompt string, which is
2485 printed when the command interpreter needs more input
2486 to complete a command. Usually "> ".
2490 In the current implementation, the local variables
2491 space and global environment variables space are
2492 separated. Local variables are those you define by
2493 simply typing `name=value'. To access a local
2494 variable later on, you have write `$name' or
2495 `${name}'; to execute the contents of a variable
2496 directly type `$name' at the command prompt.
2498 Global environment variables are those you use
2499 setenv/printenv to work with. To run a command stored
2500 in such a variable, you need to use the run command,
2501 and you must not use the '$' sign to access them.
2503 To store commands and special characters in a
2504 variable, please use double quotation marks
2505 surrounding the whole text of the variable, instead
2506 of the backslashes before semicolons and special
2509 - Commandline Editing and History:
2510 CONFIG_CMDLINE_EDITING
2512 Enable editing and History functions for interactive
2513 commandline input operations
2515 - Default Environment:
2516 CONFIG_EXTRA_ENV_SETTINGS
2518 Define this to contain any number of null terminated
2519 strings (variable = value pairs) that will be part of
2520 the default environment compiled into the boot image.
2522 For example, place something like this in your
2523 board's config file:
2525 #define CONFIG_EXTRA_ENV_SETTINGS \
2529 Warning: This method is based on knowledge about the
2530 internal format how the environment is stored by the
2531 U-Boot code. This is NOT an official, exported
2532 interface! Although it is unlikely that this format
2533 will change soon, there is no guarantee either.
2534 You better know what you are doing here.
2536 Note: overly (ab)use of the default environment is
2537 discouraged. Make sure to check other ways to preset
2538 the environment like the "source" command or the
2541 CONFIG_ENV_VARS_UBOOT_CONFIG
2543 Define this in order to add variables describing the
2544 U-Boot build configuration to the default environment.
2545 These will be named arch, cpu, board, vendor, and soc.
2547 Enabling this option will cause the following to be defined:
2555 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
2557 Define this in order to add variables describing certain
2558 run-time determined information about the hardware to the
2559 environment. These will be named board_name, board_rev.
2561 CONFIG_DELAY_ENVIRONMENT
2563 Normally the environment is loaded when the board is
2564 intialised so that it is available to U-Boot. This inhibits
2565 that so that the environment is not available until
2566 explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
2567 this is instead controlled by the value of
2568 /config/load-environment.
2570 - DataFlash Support:
2571 CONFIG_HAS_DATAFLASH
2573 Defining this option enables DataFlash features and
2574 allows to read/write in Dataflash via the standard
2577 - Serial Flash support
2580 Defining this option enables SPI flash commands
2581 'sf probe/read/write/erase/update'.
2583 Usage requires an initial 'probe' to define the serial
2584 flash parameters, followed by read/write/erase/update
2587 The following defaults may be provided by the platform
2588 to handle the common case when only a single serial
2589 flash is present on the system.
2591 CONFIG_SF_DEFAULT_BUS Bus identifier
2592 CONFIG_SF_DEFAULT_CS Chip-select
2593 CONFIG_SF_DEFAULT_MODE (see include/spi.h)
2594 CONFIG_SF_DEFAULT_SPEED in Hz
2598 Define this option to include a destructive SPI flash
2601 CONFIG_SPI_FLASH_BAR Ban/Extended Addr Reg
2603 Define this option to use the Bank addr/Extended addr
2604 support on SPI flashes which has size > 16Mbytes.
2606 - SystemACE Support:
2609 Adding this option adds support for Xilinx SystemACE
2610 chips attached via some sort of local bus. The address
2611 of the chip must also be defined in the
2612 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
2614 #define CONFIG_SYSTEMACE
2615 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
2617 When SystemACE support is added, the "ace" device type
2618 becomes available to the fat commands, i.e. fatls.
2620 - TFTP Fixed UDP Port:
2623 If this is defined, the environment variable tftpsrcp
2624 is used to supply the TFTP UDP source port value.
2625 If tftpsrcp isn't defined, the normal pseudo-random port
2626 number generator is used.
2628 Also, the environment variable tftpdstp is used to supply
2629 the TFTP UDP destination port value. If tftpdstp isn't
2630 defined, the normal port 69 is used.
2632 The purpose for tftpsrcp is to allow a TFTP server to
2633 blindly start the TFTP transfer using the pre-configured
2634 target IP address and UDP port. This has the effect of
2635 "punching through" the (Windows XP) firewall, allowing
2636 the remainder of the TFTP transfer to proceed normally.
2637 A better solution is to properly configure the firewall,
2638 but sometimes that is not allowed.
2643 This enables a generic 'hash' command which can produce
2644 hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2648 Enable the hash verify command (hash -v). This adds to code
2651 CONFIG_SHA1 - support SHA1 hashing
2652 CONFIG_SHA256 - support SHA256 hashing
2654 Note: There is also a sha1sum command, which should perhaps
2655 be deprecated in favour of 'hash sha1'.
2657 - Freescale i.MX specific commands:
2658 CONFIG_CMD_HDMIDETECT
2659 This enables 'hdmidet' command which returns true if an
2660 HDMI monitor is detected. This command is i.MX 6 specific.
2663 This enables the 'bmode' (bootmode) command for forcing
2664 a boot from specific media.
2666 This is useful for forcing the ROM's usb downloader to
2667 activate upon a watchdog reset which is nice when iterating
2668 on U-Boot. Using the reset button or running bmode normal
2669 will set it back to normal. This command currently
2670 supports i.MX53 and i.MX6.
2675 This enables the RSA algorithm used for FIT image verification
2676 in U-Boot. See doc/uImage/signature for more information.
2678 The signing part is build into mkimage regardless of this
2682 - Show boot progress:
2683 CONFIG_SHOW_BOOT_PROGRESS
2685 Defining this option allows to add some board-
2686 specific code (calling a user-provided function
2687 "show_boot_progress(int)") that enables you to show
2688 the system's boot progress on some display (for
2689 example, some LED's) on your board. At the moment,
2690 the following checkpoints are implemented:
2692 - Detailed boot stage timing
2694 Define this option to get detailed timing of each stage
2695 of the boot process.
2697 CONFIG_BOOTSTAGE_USER_COUNT
2698 This is the number of available user bootstage records.
2699 Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
2700 a new ID will be allocated from this stash. If you exceed
2701 the limit, recording will stop.
2703 CONFIG_BOOTSTAGE_REPORT
2704 Define this to print a report before boot, similar to this:
2706 Timer summary in microseconds:
2709 3,575,678 3,575,678 board_init_f start
2710 3,575,695 17 arch_cpu_init A9
2711 3,575,777 82 arch_cpu_init done
2712 3,659,598 83,821 board_init_r start
2713 3,910,375 250,777 main_loop
2714 29,916,167 26,005,792 bootm_start
2715 30,361,327 445,160 start_kernel
2717 CONFIG_CMD_BOOTSTAGE
2718 Add a 'bootstage' command which supports printing a report
2719 and un/stashing of bootstage data.
2721 CONFIG_BOOTSTAGE_FDT
2722 Stash the bootstage information in the FDT. A root 'bootstage'
2723 node is created with each bootstage id as a child. Each child
2724 has a 'name' property and either 'mark' containing the
2725 mark time in microsecond, or 'accum' containing the
2726 accumulated time for that bootstage id in microseconds.
2731 name = "board_init_f";
2740 Code in the Linux kernel can find this in /proc/devicetree.
2742 Legacy uImage format:
2745 1 common/cmd_bootm.c before attempting to boot an image
2746 -1 common/cmd_bootm.c Image header has bad magic number
2747 2 common/cmd_bootm.c Image header has correct magic number
2748 -2 common/cmd_bootm.c Image header has bad checksum
2749 3 common/cmd_bootm.c Image header has correct checksum
2750 -3 common/cmd_bootm.c Image data has bad checksum
2751 4 common/cmd_bootm.c Image data has correct checksum
2752 -4 common/cmd_bootm.c Image is for unsupported architecture
2753 5 common/cmd_bootm.c Architecture check OK
2754 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
2755 6 common/cmd_bootm.c Image Type check OK
2756 -6 common/cmd_bootm.c gunzip uncompression error
2757 -7 common/cmd_bootm.c Unimplemented compression type
2758 7 common/cmd_bootm.c Uncompression OK
2759 8 common/cmd_bootm.c No uncompress/copy overwrite error
2760 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
2762 9 common/image.c Start initial ramdisk verification
2763 -10 common/image.c Ramdisk header has bad magic number
2764 -11 common/image.c Ramdisk header has bad checksum
2765 10 common/image.c Ramdisk header is OK
2766 -12 common/image.c Ramdisk data has bad checksum
2767 11 common/image.c Ramdisk data has correct checksum
2768 12 common/image.c Ramdisk verification complete, start loading
2769 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
2770 13 common/image.c Start multifile image verification
2771 14 common/image.c No initial ramdisk, no multifile, continue.
2773 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2775 -30 arch/powerpc/lib/board.c Fatal error, hang the system
2776 -31 post/post.c POST test failed, detected by post_output_backlog()
2777 -32 post/post.c POST test failed, detected by post_run_single()
2779 34 common/cmd_doc.c before loading a Image from a DOC device
2780 -35 common/cmd_doc.c Bad usage of "doc" command
2781 35 common/cmd_doc.c correct usage of "doc" command
2782 -36 common/cmd_doc.c No boot device
2783 36 common/cmd_doc.c correct boot device
2784 -37 common/cmd_doc.c Unknown Chip ID on boot device
2785 37 common/cmd_doc.c correct chip ID found, device available
2786 -38 common/cmd_doc.c Read Error on boot device
2787 38 common/cmd_doc.c reading Image header from DOC device OK
2788 -39 common/cmd_doc.c Image header has bad magic number
2789 39 common/cmd_doc.c Image header has correct magic number
2790 -40 common/cmd_doc.c Error reading Image from DOC device
2791 40 common/cmd_doc.c Image header has correct magic number
2792 41 common/cmd_ide.c before loading a Image from a IDE device
2793 -42 common/cmd_ide.c Bad usage of "ide" command
2794 42 common/cmd_ide.c correct usage of "ide" command
2795 -43 common/cmd_ide.c No boot device
2796 43 common/cmd_ide.c boot device found
2797 -44 common/cmd_ide.c Device not available
2798 44 common/cmd_ide.c Device available
2799 -45 common/cmd_ide.c wrong partition selected
2800 45 common/cmd_ide.c partition selected
2801 -46 common/cmd_ide.c Unknown partition table
2802 46 common/cmd_ide.c valid partition table found
2803 -47 common/cmd_ide.c Invalid partition type
2804 47 common/cmd_ide.c correct partition type
2805 -48 common/cmd_ide.c Error reading Image Header on boot device
2806 48 common/cmd_ide.c reading Image Header from IDE device OK
2807 -49 common/cmd_ide.c Image header has bad magic number
2808 49 common/cmd_ide.c Image header has correct magic number
2809 -50 common/cmd_ide.c Image header has bad checksum
2810 50 common/cmd_ide.c Image header has correct checksum
2811 -51 common/cmd_ide.c Error reading Image from IDE device
2812 51 common/cmd_ide.c reading Image from IDE device OK
2813 52 common/cmd_nand.c before loading a Image from a NAND device
2814 -53 common/cmd_nand.c Bad usage of "nand" command
2815 53 common/cmd_nand.c correct usage of "nand" command
2816 -54 common/cmd_nand.c No boot device
2817 54 common/cmd_nand.c boot device found
2818 -55 common/cmd_nand.c Unknown Chip ID on boot device
2819 55 common/cmd_nand.c correct chip ID found, device available
2820 -56 common/cmd_nand.c Error reading Image Header on boot device
2821 56 common/cmd_nand.c reading Image Header from NAND device OK
2822 -57 common/cmd_nand.c Image header has bad magic number
2823 57 common/cmd_nand.c Image header has correct magic number
2824 -58 common/cmd_nand.c Error reading Image from NAND device
2825 58 common/cmd_nand.c reading Image from NAND device OK
2827 -60 common/env_common.c Environment has a bad CRC, using default
2829 64 net/eth.c starting with Ethernet configuration.
2830 -64 net/eth.c no Ethernet found.
2831 65 net/eth.c Ethernet found.
2833 -80 common/cmd_net.c usage wrong
2834 80 common/cmd_net.c before calling NetLoop()
2835 -81 common/cmd_net.c some error in NetLoop() occurred
2836 81 common/cmd_net.c NetLoop() back without error
2837 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
2838 82 common/cmd_net.c trying automatic boot
2839 83 common/cmd_net.c running "source" command
2840 -83 common/cmd_net.c some error in automatic boot or "source" command
2841 84 common/cmd_net.c end without errors
2846 100 common/cmd_bootm.c Kernel FIT Image has correct format
2847 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
2848 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
2849 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
2850 102 common/cmd_bootm.c Kernel unit name specified
2851 -103 common/cmd_bootm.c Can't get kernel subimage node offset
2852 103 common/cmd_bootm.c Found configuration node
2853 104 common/cmd_bootm.c Got kernel subimage node offset
2854 -104 common/cmd_bootm.c Kernel subimage hash verification failed
2855 105 common/cmd_bootm.c Kernel subimage hash verification OK
2856 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
2857 106 common/cmd_bootm.c Architecture check OK
2858 -106 common/cmd_bootm.c Kernel subimage has wrong type
2859 107 common/cmd_bootm.c Kernel subimage type OK
2860 -107 common/cmd_bootm.c Can't get kernel subimage data/size
2861 108 common/cmd_bootm.c Got kernel subimage data/size
2862 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
2863 -109 common/cmd_bootm.c Can't get kernel subimage type
2864 -110 common/cmd_bootm.c Can't get kernel subimage comp
2865 -111 common/cmd_bootm.c Can't get kernel subimage os
2866 -112 common/cmd_bootm.c Can't get kernel subimage load address
2867 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
2869 120 common/image.c Start initial ramdisk verification
2870 -120 common/image.c Ramdisk FIT image has incorrect format
2871 121 common/image.c Ramdisk FIT image has correct format
2872 122 common/image.c No ramdisk subimage unit name, using configuration
2873 -122 common/image.c Can't get configuration for ramdisk subimage
2874 123 common/image.c Ramdisk unit name specified
2875 -124 common/image.c Can't get ramdisk subimage node offset
2876 125 common/image.c Got ramdisk subimage node offset
2877 -125 common/image.c Ramdisk subimage hash verification failed
2878 126 common/image.c Ramdisk subimage hash verification OK
2879 -126 common/image.c Ramdisk subimage for unsupported architecture
2880 127 common/image.c Architecture check OK
2881 -127 common/image.c Can't get ramdisk subimage data/size
2882 128 common/image.c Got ramdisk subimage data/size
2883 129 common/image.c Can't get ramdisk load address
2884 -129 common/image.c Got ramdisk load address
2886 -130 common/cmd_doc.c Incorrect FIT image format
2887 131 common/cmd_doc.c FIT image format OK
2889 -140 common/cmd_ide.c Incorrect FIT image format
2890 141 common/cmd_ide.c FIT image format OK
2892 -150 common/cmd_nand.c Incorrect FIT image format
2893 151 common/cmd_nand.c FIT image format OK
2895 - FIT image support:
2897 Enable support for the FIT uImage format.
2899 CONFIG_FIT_BEST_MATCH
2900 When no configuration is explicitly selected, default to the
2901 one whose fdt's compatibility field best matches that of
2902 U-Boot itself. A match is considered "best" if it matches the
2903 most specific compatibility entry of U-Boot's fdt's root node.
2904 The order of entries in the configuration's fdt is ignored.
2906 CONFIG_FIT_SIGNATURE
2907 This option enables signature verification of FIT uImages,
2908 using a hash signed and verified using RSA. See
2909 doc/uImage.FIT/signature.txt for more details.
2911 - Standalone program support:
2912 CONFIG_STANDALONE_LOAD_ADDR
2914 This option defines a board specific value for the
2915 address where standalone program gets loaded, thus
2916 overwriting the architecture dependent default
2919 - Frame Buffer Address:
2922 Define CONFIG_FB_ADDR if you want to use specific
2923 address for frame buffer. This is typically the case
2924 when using a graphics controller has separate video
2925 memory. U-Boot will then place the frame buffer at
2926 the given address instead of dynamically reserving it
2927 in system RAM by calling lcd_setmem(), which grabs
2928 the memory for the frame buffer depending on the
2929 configured panel size.
2931 Please see board_init_f function.
2933 - Automatic software updates via TFTP server
2935 CONFIG_UPDATE_TFTP_CNT_MAX
2936 CONFIG_UPDATE_TFTP_MSEC_MAX
2938 These options enable and control the auto-update feature;
2939 for a more detailed description refer to doc/README.update.
2941 - MTD Support (mtdparts command, UBI support)
2944 Adds the MTD device infrastructure from the Linux kernel.
2945 Needed for mtdparts command support.
2947 CONFIG_MTD_PARTITIONS
2949 Adds the MTD partitioning infrastructure from the Linux
2950 kernel. Needed for UBI support.
2955 Adds commands for interacting with MTD partitions formatted
2956 with the UBI flash translation layer
2958 Requires also defining CONFIG_RBTREE
2960 CONFIG_UBI_SILENCE_MSG
2962 Make the verbose messages from UBI stop printing. This leaves
2963 warnings and errors enabled.
2968 Adds commands for interacting with UBI volumes formatted as
2969 UBIFS. UBIFS is read-only in u-boot.
2971 Requires UBI support as well as CONFIG_LZO
2973 CONFIG_UBIFS_SILENCE_MSG
2975 Make the verbose messages from UBIFS stop printing. This leaves
2976 warnings and errors enabled.
2980 Enable building of SPL globally.
2983 LDSCRIPT for linking the SPL binary.
2985 CONFIG_SPL_MAX_FOOTPRINT
2986 Maximum size in memory allocated to the SPL, BSS included.
2987 When defined, the linker checks that the actual memory
2988 used by SPL from _start to __bss_end does not exceed it.
2989 CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
2990 must not be both defined at the same time.
2993 Maximum size of the SPL image (text, data, rodata, and
2994 linker lists sections), BSS excluded.
2995 When defined, the linker checks that the actual size does
2998 CONFIG_SPL_TEXT_BASE
2999 TEXT_BASE for linking the SPL binary.
3001 CONFIG_SPL_RELOC_TEXT_BASE
3002 Address to relocate to. If unspecified, this is equal to
3003 CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
3005 CONFIG_SPL_BSS_START_ADDR
3006 Link address for the BSS within the SPL binary.
3008 CONFIG_SPL_BSS_MAX_SIZE
3009 Maximum size in memory allocated to the SPL BSS.
3010 When defined, the linker checks that the actual memory used
3011 by SPL from __bss_start to __bss_end does not exceed it.
3012 CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
3013 must not be both defined at the same time.
3016 Adress of the start of the stack SPL will use
3018 CONFIG_SPL_RELOC_STACK
3019 Adress of the start of the stack SPL will use after
3020 relocation. If unspecified, this is equal to
3023 CONFIG_SYS_SPL_MALLOC_START
3024 Starting address of the malloc pool used in SPL.
3026 CONFIG_SYS_SPL_MALLOC_SIZE
3027 The size of the malloc pool used in SPL.
3029 CONFIG_SPL_FRAMEWORK
3030 Enable the SPL framework under common/. This framework
3031 supports MMC, NAND and YMODEM loading of U-Boot and NAND
3032 NAND loading of the Linux Kernel.
3034 CONFIG_SPL_DISPLAY_PRINT
3035 For ARM, enable an optional function to print more information
3036 about the running system.
3038 CONFIG_SPL_INIT_MINIMAL
3039 Arch init code should be built for a very small image
3041 CONFIG_SPL_LIBCOMMON_SUPPORT
3042 Support for common/libcommon.o in SPL binary
3044 CONFIG_SPL_LIBDISK_SUPPORT
3045 Support for disk/libdisk.o in SPL binary
3047 CONFIG_SPL_I2C_SUPPORT
3048 Support for drivers/i2c/libi2c.o in SPL binary
3050 CONFIG_SPL_GPIO_SUPPORT
3051 Support for drivers/gpio/libgpio.o in SPL binary
3053 CONFIG_SPL_MMC_SUPPORT
3054 Support for drivers/mmc/libmmc.o in SPL binary
3056 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
3057 CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
3058 CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
3059 Address, size and partition on the MMC to load U-Boot from
3060 when the MMC is being used in raw mode.
3062 CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
3063 Sector to load kernel uImage from when MMC is being
3064 used in raw mode (for Falcon mode)
3066 CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
3067 CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
3068 Sector and number of sectors to load kernel argument
3069 parameters from when MMC is being used in raw mode
3072 CONFIG_SPL_FAT_SUPPORT
3073 Support for fs/fat/libfat.o in SPL binary
3075 CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
3076 Filename to read to load U-Boot when reading from FAT
3078 CONFIG_SPL_FAT_LOAD_KERNEL_NAME
3079 Filename to read to load kernel uImage when reading
3080 from FAT (for Falcon mode)
3082 CONFIG_SPL_FAT_LOAD_ARGS_NAME
3083 Filename to read to load kernel argument parameters
3084 when reading from FAT (for Falcon mode)
3086 CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
3087 Set this for NAND SPL on PPC mpc83xx targets, so that
3088 start.S waits for the rest of the SPL to load before
3089 continuing (the hardware starts execution after just
3090 loading the first page rather than the full 4K).
3092 CONFIG_SPL_NAND_BASE
3093 Include nand_base.c in the SPL. Requires
3094 CONFIG_SPL_NAND_DRIVERS.
3096 CONFIG_SPL_NAND_DRIVERS
3097 SPL uses normal NAND drivers, not minimal drivers.
3100 Include standard software ECC in the SPL
3102 CONFIG_SPL_NAND_SIMPLE
3103 Support for NAND boot using simple NAND drivers that
3104 expose the cmd_ctrl() interface.
3106 CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
3107 Set for the SPL on PPC mpc8xxx targets, support for
3108 arch/powerpc/cpu/mpc8xxx/ddr/libddr.o in SPL binary.
3110 CONFIG_SPL_COMMON_INIT_DDR
3111 Set for common ddr init with serial presence detect in
3114 CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
3115 CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
3116 CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
3117 CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
3118 CONFIG_SYS_NAND_ECCBYTES
3119 Defines the size and behavior of the NAND that SPL uses
3122 CONFIG_SYS_NAND_U_BOOT_OFFS
3123 Location in NAND to read U-Boot from
3125 CONFIG_SYS_NAND_U_BOOT_DST
3126 Location in memory to load U-Boot to
3128 CONFIG_SYS_NAND_U_BOOT_SIZE
3129 Size of image to load
3131 CONFIG_SYS_NAND_U_BOOT_START
3132 Entry point in loaded image to jump to
3134 CONFIG_SYS_NAND_HW_ECC_OOBFIRST
3135 Define this if you need to first read the OOB and then the
3136 data. This is used for example on davinci plattforms.
3138 CONFIG_SPL_OMAP3_ID_NAND
3139 Support for an OMAP3-specific set of functions to return the
3140 ID and MFR of the first attached NAND chip, if present.
3142 CONFIG_SPL_SERIAL_SUPPORT
3143 Support for drivers/serial/libserial.o in SPL binary
3145 CONFIG_SPL_SPI_FLASH_SUPPORT
3146 Support for drivers/mtd/spi/libspi_flash.o in SPL binary
3148 CONFIG_SPL_SPI_SUPPORT
3149 Support for drivers/spi/libspi.o in SPL binary
3151 CONFIG_SPL_RAM_DEVICE
3152 Support for running image already present in ram, in SPL binary
3154 CONFIG_SPL_LIBGENERIC_SUPPORT
3155 Support for lib/libgeneric.o in SPL binary
3157 CONFIG_SPL_ENV_SUPPORT
3158 Support for the environment operating in SPL binary
3160 CONFIG_SPL_NET_SUPPORT
3161 Support for the net/libnet.o in SPL binary.
3162 It conflicts with SPL env from storage medium specified by
3163 CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3166 Image offset to which the SPL should be padded before appending
3167 the SPL payload. By default, this is defined as
3168 CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
3169 CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
3170 payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
3173 Final target image containing SPL and payload. Some SPLs
3174 use an arch-specific makefile fragment instead, for
3175 example if more than one image needs to be produced.
3177 CONFIG_FIT_SPL_PRINT
3178 Printing information about a FIT image adds quite a bit of
3179 code to SPL. So this is normally disabled in SPL. Use this
3180 option to re-enable it. This will affect the output of the
3181 bootm command when booting a FIT image.
3185 Enable building of TPL globally.
3188 Image offset to which the TPL should be padded before appending
3189 the TPL payload. By default, this is defined as
3190 CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
3191 CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
3192 payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
3197 [so far only for SMDK2400 boards]
3199 - Modem support enable:
3200 CONFIG_MODEM_SUPPORT
3202 - RTS/CTS Flow control enable:
3205 - Modem debug support:
3206 CONFIG_MODEM_SUPPORT_DEBUG
3208 Enables debugging stuff (char screen[1024], dbg())
3209 for modem support. Useful only with BDI2000.
3211 - Interrupt support (PPC):
3213 There are common interrupt_init() and timer_interrupt()
3214 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
3215 for CPU specific initialization. interrupt_init_cpu()
3216 should set decrementer_count to appropriate value. If
3217 CPU resets decrementer automatically after interrupt
3218 (ppc4xx) it should set decrementer_count to zero.
3219 timer_interrupt() calls timer_interrupt_cpu() for CPU
3220 specific handling. If board has watchdog / status_led
3221 / other_activity_monitor it works automatically from
3222 general timer_interrupt().
3226 In the target system modem support is enabled when a
3227 specific key (key combination) is pressed during
3228 power-on. Otherwise U-Boot will boot normally
3229 (autoboot). The key_pressed() function is called from
3230 board_init(). Currently key_pressed() is a dummy
3231 function, returning 1 and thus enabling modem
3234 If there are no modem init strings in the
3235 environment, U-Boot proceed to autoboot; the
3236 previous output (banner, info printfs) will be
3239 See also: doc/README.Modem
3241 Board initialization settings:
3242 ------------------------------
3244 During Initialization u-boot calls a number of board specific functions
3245 to allow the preparation of board specific prerequisites, e.g. pin setup
3246 before drivers are initialized. To enable these callbacks the
3247 following configuration macros have to be defined. Currently this is
3248 architecture specific, so please check arch/your_architecture/lib/board.c
3249 typically in board_init_f() and board_init_r().
3251 - CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
3252 - CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
3253 - CONFIG_BOARD_LATE_INIT: Call board_late_init()
3254 - CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3256 Configuration Settings:
3257 -----------------------
3259 - CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3260 undefine this when you're short of memory.
3262 - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
3263 width of the commands listed in the 'help' command output.
3265 - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
3266 prompt for user input.
3268 - CONFIG_SYS_CBSIZE: Buffer size for input from the Console
3270 - CONFIG_SYS_PBSIZE: Buffer size for Console output
3272 - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
3274 - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3275 the application (usually a Linux kernel) when it is
3278 - CONFIG_SYS_BAUDRATE_TABLE:
3279 List of legal baudrate settings for this board.
3281 - CONFIG_SYS_CONSOLE_INFO_QUIET
3282 Suppress display of console information at boot.
3284 - CONFIG_SYS_CONSOLE_IS_IN_ENV
3285 If the board specific function
3286 extern int overwrite_console (void);
3287 returns 1, the stdin, stderr and stdout are switched to the
3288 serial port, else the settings in the environment are used.
3290 - CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3291 Enable the call to overwrite_console().
3293 - CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3294 Enable overwrite of previous console environment settings.
3296 - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3297 Begin and End addresses of the area used by the
3300 - CONFIG_SYS_ALT_MEMTEST:
3301 Enable an alternate, more extensive memory test.
3303 - CONFIG_SYS_MEMTEST_SCRATCH:
3304 Scratch address used by the alternate memory test
3305 You only need to set this if address zero isn't writeable
3307 - CONFIG_SYS_MEM_TOP_HIDE (PPC only):
3308 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
3309 this specified memory area will get subtracted from the top
3310 (end) of RAM and won't get "touched" at all by U-Boot. By
3311 fixing up gd->ram_size the Linux kernel should gets passed
3312 the now "corrected" memory size and won't touch it either.
3313 This should work for arch/ppc and arch/powerpc. Only Linux
3314 board ports in arch/powerpc with bootwrapper support that
3315 recalculate the memory size from the SDRAM controller setup
3316 will have to get fixed in Linux additionally.
3318 This option can be used as a workaround for the 440EPx/GRx
3319 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
3322 WARNING: Please make sure that this value is a multiple of
3323 the Linux page size (normally 4k). If this is not the case,
3324 then the end address of the Linux memory will be located at a
3325 non page size aligned address and this could cause major
3328 - CONFIG_SYS_LOADS_BAUD_CHANGE:
3329 Enable temporary baudrate change while serial download
3331 - CONFIG_SYS_SDRAM_BASE:
3332 Physical start address of SDRAM. _Must_ be 0 here.
3334 - CONFIG_SYS_MBIO_BASE:
3335 Physical start address of Motherboard I/O (if using a
3338 - CONFIG_SYS_FLASH_BASE:
3339 Physical start address of Flash memory.
3341 - CONFIG_SYS_MONITOR_BASE:
3342 Physical start address of boot monitor code (set by
3343 make config files to be same as the text base address
3344 (CONFIG_SYS_TEXT_BASE) used when linking) - same as
3345 CONFIG_SYS_FLASH_BASE when booting from flash.
3347 - CONFIG_SYS_MONITOR_LEN:
3348 Size of memory reserved for monitor code, used to
3349 determine _at_compile_time_ (!) if the environment is
3350 embedded within the U-Boot image, or in a separate
3353 - CONFIG_SYS_MALLOC_LEN:
3354 Size of DRAM reserved for malloc() use.
3356 - CONFIG_SYS_BOOTM_LEN:
3357 Normally compressed uImages are limited to an
3358 uncompressed size of 8 MBytes. If this is not enough,
3359 you can define CONFIG_SYS_BOOTM_LEN in your board config file
3360 to adjust this setting to your needs.
3362 - CONFIG_SYS_BOOTMAPSZ:
3363 Maximum size of memory mapped by the startup code of
3364 the Linux kernel; all data that must be processed by
3365 the Linux kernel (bd_info, boot arguments, FDT blob if
3366 used) must be put below this limit, unless "bootm_low"
3367 environment variable is defined and non-zero. In such case
3368 all data for the Linux kernel must be between "bootm_low"
3369 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
3370 variable "bootm_mapsize" will override the value of
3371 CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
3372 then the value in "bootm_size" will be used instead.
3374 - CONFIG_SYS_BOOT_RAMDISK_HIGH:
3375 Enable initrd_high functionality. If defined then the
3376 initrd_high feature is enabled and the bootm ramdisk subcommand
3379 - CONFIG_SYS_BOOT_GET_CMDLINE:
3380 Enables allocating and saving kernel cmdline in space between
3381 "bootm_low" and "bootm_low" + BOOTMAPSZ.
3383 - CONFIG_SYS_BOOT_GET_KBD:
3384 Enables allocating and saving a kernel copy of the bd_info in
3385 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3387 - CONFIG_SYS_MAX_FLASH_BANKS:
3388 Max number of Flash memory banks
3390 - CONFIG_SYS_MAX_FLASH_SECT:
3391 Max number of sectors on a Flash chip
3393 - CONFIG_SYS_FLASH_ERASE_TOUT:
3394 Timeout for Flash erase operations (in ms)
3396 - CONFIG_SYS_FLASH_WRITE_TOUT:
3397 Timeout for Flash write operations (in ms)
3399 - CONFIG_SYS_FLASH_LOCK_TOUT
3400 Timeout for Flash set sector lock bit operation (in ms)
3402 - CONFIG_SYS_FLASH_UNLOCK_TOUT
3403 Timeout for Flash clear lock bits operation (in ms)
3405 - CONFIG_SYS_FLASH_PROTECTION
3406 If defined, hardware flash sectors protection is used
3407 instead of U-Boot software protection.
3409 - CONFIG_SYS_DIRECT_FLASH_TFTP:
3411 Enable TFTP transfers directly to flash memory;
3412 without this option such a download has to be
3413 performed in two steps: (1) download to RAM, and (2)
3414 copy from RAM to flash.
3416 The two-step approach is usually more reliable, since
3417 you can check if the download worked before you erase
3418 the flash, but in some situations (when system RAM is
3419 too limited to allow for a temporary copy of the
3420 downloaded image) this option may be very useful.
3422 - CONFIG_SYS_FLASH_CFI:
3423 Define if the flash driver uses extra elements in the
3424 common flash structure for storing flash geometry.
3426 - CONFIG_FLASH_CFI_DRIVER
3427 This option also enables the building of the cfi_flash driver
3428 in the drivers directory
3430 - CONFIG_FLASH_CFI_MTD
3431 This option enables the building of the cfi_mtd driver
3432 in the drivers directory. The driver exports CFI flash
3435 - CONFIG_SYS_FLASH_USE_BUFFER_WRITE
3436 Use buffered writes to flash.
3438 - CONFIG_FLASH_SPANSION_S29WS_N
3439 s29ws-n MirrorBit flash has non-standard addresses for buffered
3442 - CONFIG_SYS_FLASH_QUIET_TEST
3443 If this option is defined, the common CFI flash doesn't
3444 print it's warning upon not recognized FLASH banks. This
3445 is useful, if some of the configured banks are only
3446 optionally available.
3448 - CONFIG_FLASH_SHOW_PROGRESS
3449 If defined (must be an integer), print out countdown
3450 digits and dots. Recommended value: 45 (9..1) for 80
3451 column displays, 15 (3..1) for 40 column displays.
3453 - CONFIG_FLASH_VERIFY
3454 If defined, the content of the flash (destination) is compared
3455 against the source after the write operation. An error message
3456 will be printed when the contents are not identical.
3457 Please note that this option is useless in nearly all cases,
3458 since such flash programming errors usually are detected earlier
3459 while unprotecting/erasing/programming. Please only enable
3460 this option if you really know what you are doing.
3462 - CONFIG_SYS_RX_ETH_BUFFER:
3463 Defines the number of Ethernet receive buffers. On some
3464 Ethernet controllers it is recommended to set this value
3465 to 8 or even higher (EEPRO100 or 405 EMAC), since all
3466 buffers can be full shortly after enabling the interface
3467 on high Ethernet traffic.
3468 Defaults to 4 if not defined.
3470 - CONFIG_ENV_MAX_ENTRIES
3472 Maximum number of entries in the hash table that is used
3473 internally to store the environment settings. The default
3474 setting is supposed to be generous and should work in most
3475 cases. This setting can be used to tune behaviour; see
3476 lib/hashtable.c for details.
3478 - CONFIG_ENV_FLAGS_LIST_DEFAULT
3479 - CONFIG_ENV_FLAGS_LIST_STATIC
3480 Enable validation of the values given to environment variables when
3481 calling env set. Variables can be restricted to only decimal,
3482 hexadecimal, or boolean. If CONFIG_CMD_NET is also defined,
3483 the variables can also be restricted to IP address or MAC address.
3485 The format of the list is:
3486 type_attribute = [s|d|x|b|i|m]
3487 access_atribute = [a|r|o|c]
3488 attributes = type_attribute[access_atribute]
3489 entry = variable_name[:attributes]
3492 The type attributes are:
3493 s - String (default)
3496 b - Boolean ([1yYtT|0nNfF])
3500 The access attributes are:
3506 - CONFIG_ENV_FLAGS_LIST_DEFAULT
3507 Define this to a list (string) to define the ".flags"
3508 envirnoment variable in the default or embedded environment.
3510 - CONFIG_ENV_FLAGS_LIST_STATIC
3511 Define this to a list (string) to define validation that
3512 should be done if an entry is not found in the ".flags"
3513 environment variable. To override a setting in the static
3514 list, simply add an entry for the same variable name to the
3517 - CONFIG_ENV_ACCESS_IGNORE_FORCE
3518 If defined, don't allow the -f switch to env set override variable
3521 - CONFIG_SYS_GENERIC_BOARD
3522 This selects the architecture-generic board system instead of the
3523 architecture-specific board files. It is intended to move boards
3524 to this new framework over time. Defining this will disable the
3525 arch/foo/lib/board.c file and use common/board_f.c and
3526 common/board_r.c instead. To use this option your architecture
3527 must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
3528 its config.mk file). If you find problems enabling this option on
3529 your board please report the problem and send patches!
3531 - CONFIG_SYS_SYM_OFFSETS
3532 This is set by architectures that use offsets for link symbols
3533 instead of absolute values. So bss_start is obtained using an
3534 offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
3535 directly. You should not need to touch this setting.
3537 - CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
3538 This is set by OMAP boards for the max time that reset should
3539 be asserted. See doc/README.omap-reset-time for details on how
3540 the value can be calulated on a given board.
3542 The following definitions that deal with the placement and management
3543 of environment data (variable area); in general, we support the
3544 following configurations:
3546 - CONFIG_BUILD_ENVCRC:
3548 Builds up envcrc with the target environment so that external utils
3549 may easily extract it and embed it in final U-Boot images.
3551 - CONFIG_ENV_IS_IN_FLASH:
3553 Define this if the environment is in flash memory.
3555 a) The environment occupies one whole flash sector, which is
3556 "embedded" in the text segment with the U-Boot code. This
3557 happens usually with "bottom boot sector" or "top boot
3558 sector" type flash chips, which have several smaller
3559 sectors at the start or the end. For instance, such a
3560 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3561 such a case you would place the environment in one of the
3562 4 kB sectors - with U-Boot code before and after it. With
3563 "top boot sector" type flash chips, you would put the
3564 environment in one of the last sectors, leaving a gap
3565 between U-Boot and the environment.
3567 - CONFIG_ENV_OFFSET:
3569 Offset of environment data (variable area) to the
3570 beginning of flash memory; for instance, with bottom boot
3571 type flash chips the second sector can be used: the offset
3572 for this sector is given here.
3574 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3578 This is just another way to specify the start address of
3579 the flash sector containing the environment (instead of
3582 - CONFIG_ENV_SECT_SIZE:
3584 Size of the sector containing the environment.
3587 b) Sometimes flash chips have few, equal sized, BIG sectors.
3588 In such a case you don't want to spend a whole sector for
3593 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
3594 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3595 of this flash sector for the environment. This saves
3596 memory for the RAM copy of the environment.
3598 It may also save flash memory if you decide to use this
3599 when your environment is "embedded" within U-Boot code,
3600 since then the remainder of the flash sector could be used
3601 for U-Boot code. It should be pointed out that this is
3602 STRONGLY DISCOURAGED from a robustness point of view:
3603 updating the environment in flash makes it always
3604 necessary to erase the WHOLE sector. If something goes
3605 wrong before the contents has been restored from a copy in
3606 RAM, your target system will be dead.
3608 - CONFIG_ENV_ADDR_REDUND
3609 CONFIG_ENV_SIZE_REDUND
3611 These settings describe a second storage area used to hold
3612 a redundant copy of the environment data, so that there is
3613 a valid backup copy in case there is a power failure during
3614 a "saveenv" operation.
3616 BE CAREFUL! Any changes to the flash layout, and some changes to the
3617 source code will make it necessary to adapt <board>/u-boot.lds*
3621 - CONFIG_ENV_IS_IN_NVRAM:
3623 Define this if you have some non-volatile memory device
3624 (NVRAM, battery buffered SRAM) which you want to use for the
3630 These two #defines are used to determine the memory area you
3631 want to use for environment. It is assumed that this memory
3632 can just be read and written to, without any special
3635 BE CAREFUL! The first access to the environment happens quite early
3636 in U-Boot initalization (when we try to get the setting of for the
3637 console baudrate). You *MUST* have mapped your NVRAM area then, or
3640 Please note that even with NVRAM we still use a copy of the
3641 environment in RAM: we could work on NVRAM directly, but we want to
3642 keep settings there always unmodified except somebody uses "saveenv"
3643 to save the current settings.
3646 - CONFIG_ENV_IS_IN_EEPROM:
3648 Use this if you have an EEPROM or similar serial access
3649 device and a driver for it.
3651 - CONFIG_ENV_OFFSET:
3654 These two #defines specify the offset and size of the
3655 environment area within the total memory of your EEPROM.
3657 - CONFIG_SYS_I2C_EEPROM_ADDR:
3658 If defined, specified the chip address of the EEPROM device.
3659 The default address is zero.
3661 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3662 If defined, the number of bits used to address bytes in a
3663 single page in the EEPROM device. A 64 byte page, for example
3664 would require six bits.
3666 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3667 If defined, the number of milliseconds to delay between
3668 page writes. The default is zero milliseconds.
3670 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3671 The length in bytes of the EEPROM memory array address. Note
3672 that this is NOT the chip address length!
3674 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
3675 EEPROM chips that implement "address overflow" are ones
3676 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
3677 address and the extra bits end up in the "chip address" bit
3678 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
3681 Note that we consider the length of the address field to
3682 still be one byte because the extra address bits are hidden
3683 in the chip address.
3685 - CONFIG_SYS_EEPROM_SIZE:
3686 The size in bytes of the EEPROM device.
3688 - CONFIG_ENV_EEPROM_IS_ON_I2C
3689 define this, if you have I2C and SPI activated, and your
3690 EEPROM, which holds the environment, is on the I2C bus.
3692 - CONFIG_I2C_ENV_EEPROM_BUS
3693 if you have an Environment on an EEPROM reached over
3694 I2C muxes, you can define here, how to reach this
3695 EEPROM. For example:
3697 #define CONFIG_I2C_ENV_EEPROM_BUS 1
3699 EEPROM which holds the environment, is reached over
3700 a pca9547 i2c mux with address 0x70, channel 3.
3702 - CONFIG_ENV_IS_IN_DATAFLASH:
3704 Define this if you have a DataFlash memory device which you
3705 want to use for the environment.
3707 - CONFIG_ENV_OFFSET:
3711 These three #defines specify the offset and size of the
3712 environment area within the total memory of your DataFlash placed
3713 at the specified address.
3715 - CONFIG_ENV_IS_IN_REMOTE:
3717 Define this if you have a remote memory space which you
3718 want to use for the local device's environment.
3723 These two #defines specify the address and size of the
3724 environment area within the remote memory space. The
3725 local device can get the environment from remote memory
3726 space by SRIO or PCIE links.
3728 BE CAREFUL! For some special cases, the local device can not use
3729 "saveenv" command. For example, the local device will get the
3730 environment stored in a remote NOR flash by SRIO or PCIE link,
3731 but it can not erase, write this NOR flash by SRIO or PCIE interface.
3733 - CONFIG_ENV_IS_IN_NAND:
3735 Define this if you have a NAND device which you want to use
3736 for the environment.
3738 - CONFIG_ENV_OFFSET:
3741 These two #defines specify the offset and size of the environment
3742 area within the first NAND device. CONFIG_ENV_OFFSET must be
3743 aligned to an erase block boundary.
3745 - CONFIG_ENV_OFFSET_REDUND (optional):
3747 This setting describes a second storage area of CONFIG_ENV_SIZE
3748 size used to hold a redundant copy of the environment data, so
3749 that there is a valid backup copy in case there is a power failure
3750 during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
3751 aligned to an erase block boundary.
3753 - CONFIG_ENV_RANGE (optional):
3755 Specifies the length of the region in which the environment
3756 can be written. This should be a multiple of the NAND device's
3757 block size. Specifying a range with more erase blocks than
3758 are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3759 the range to be avoided.
3761 - CONFIG_ENV_OFFSET_OOB (optional):
3763 Enables support for dynamically retrieving the offset of the
3764 environment from block zero's out-of-band data. The
3765 "nand env.oob" command can be used to record this offset.
3766 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3767 using CONFIG_ENV_OFFSET_OOB.
3769 - CONFIG_NAND_ENV_DST
3771 Defines address in RAM to which the nand_spl code should copy the
3772 environment. If redundant environment is used, it will be copied to
3773 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3775 - CONFIG_ENV_IS_IN_UBI:
3777 Define this if you have an UBI volume that you want to use for the
3778 environment. This has the benefit of wear-leveling the environment
3779 accesses, which is important on NAND.
3781 - CONFIG_ENV_UBI_PART:
3783 Define this to a string that is the mtd partition containing the UBI.
3785 - CONFIG_ENV_UBI_VOLUME:
3787 Define this to the name of the volume that you want to store the
3790 - CONFIG_ENV_UBI_VOLUME_REDUND:
3792 Define this to the name of another volume to store a second copy of
3793 the environment in. This will enable redundant environments in UBI.
3794 It is assumed that both volumes are in the same MTD partition.
3796 - CONFIG_UBI_SILENCE_MSG
3797 - CONFIG_UBIFS_SILENCE_MSG
3799 You will probably want to define these to avoid a really noisy system
3800 when storing the env in UBI.
3802 - CONFIG_ENV_IS_IN_MMC:
3804 Define this if you have an MMC device which you want to use for the
3807 - CONFIG_SYS_MMC_ENV_DEV:
3809 Specifies which MMC device the environment is stored in.
3811 - CONFIG_SYS_MMC_ENV_PART (optional):
3813 Specifies which MMC partition the environment is stored in. If not
3814 set, defaults to partition 0, the user area. Common values might be
3815 1 (first MMC boot partition), 2 (second MMC boot partition).
3817 - CONFIG_ENV_OFFSET:
3820 These two #defines specify the offset and size of the environment
3821 area within the specified MMC device.
3823 If offset is positive (the usual case), it is treated as relative to
3824 the start of the MMC partition. If offset is negative, it is treated
3825 as relative to the end of the MMC partition. This can be useful if
3826 your board may be fitted with different MMC devices, which have
3827 different sizes for the MMC partitions, and you always want the
3828 environment placed at the very end of the partition, to leave the
3829 maximum possible space before it, to store other data.
3831 These two values are in units of bytes, but must be aligned to an
3832 MMC sector boundary.
3834 - CONFIG_ENV_OFFSET_REDUND (optional):
3836 Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
3837 hold a redundant copy of the environment data. This provides a
3838 valid backup copy in case the other copy is corrupted, e.g. due
3839 to a power failure during a "saveenv" operation.
3841 This value may also be positive or negative; this is handled in the
3842 same way as CONFIG_ENV_OFFSET.
3844 This value is also in units of bytes, but must also be aligned to
3845 an MMC sector boundary.
3847 - CONFIG_ENV_SIZE_REDUND (optional):
3849 This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
3850 set. If this value is set, it must be set to the same value as
3853 - CONFIG_SYS_SPI_INIT_OFFSET
3855 Defines offset to the initial SPI buffer area in DPRAM. The
3856 area is used at an early stage (ROM part) if the environment
3857 is configured to reside in the SPI EEPROM: We need a 520 byte
3858 scratch DPRAM area. It is used between the two initialization
3859 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3860 to be a good choice since it makes it far enough from the
3861 start of the data area as well as from the stack pointer.
3863 Please note that the environment is read-only until the monitor
3864 has been relocated to RAM and a RAM copy of the environment has been
3865 created; also, when using EEPROM you will have to use getenv_f()
3866 until then to read environment variables.
3868 The environment is protected by a CRC32 checksum. Before the monitor
3869 is relocated into RAM, as a result of a bad CRC you will be working
3870 with the compiled-in default environment - *silently*!!! [This is
3871 necessary, because the first environment variable we need is the
3872 "baudrate" setting for the console - if we have a bad CRC, we don't
3873 have any device yet where we could complain.]
3875 Note: once the monitor has been relocated, then it will complain if
3876 the default environment is used; a new CRC is computed as soon as you
3877 use the "saveenv" command to store a valid environment.
3879 - CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3880 Echo the inverted Ethernet link state to the fault LED.
3882 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3883 also needs to be defined.
3885 - CONFIG_SYS_FAULT_MII_ADDR:
3886 MII address of the PHY to check for the Ethernet link state.
3888 - CONFIG_NS16550_MIN_FUNCTIONS:
3889 Define this if you desire to only have use of the NS16550_init
3890 and NS16550_putc functions for the serial driver located at
3891 drivers/serial/ns16550.c. This option is useful for saving
3892 space for already greatly restricted images, including but not
3893 limited to NAND_SPL configurations.
3895 - CONFIG_DISPLAY_BOARDINFO
3896 Display information about the board that U-Boot is running on
3897 when U-Boot starts up. The board function checkboard() is called
3900 - CONFIG_DISPLAY_BOARDINFO_LATE
3901 Similar to the previous option, but display this information
3902 later, once stdio is running and output goes to the LCD, if
3905 Low Level (hardware related) configuration options:
3906 ---------------------------------------------------
3908 - CONFIG_SYS_CACHELINE_SIZE:
3909 Cache Line Size of the CPU.
3911 - CONFIG_SYS_DEFAULT_IMMR:
3912 Default address of the IMMR after system reset.
3914 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
3915 and RPXsuper) to be able to adjust the position of
3916 the IMMR register after a reset.
3918 - CONFIG_SYS_CCSRBAR_DEFAULT:
3919 Default (power-on reset) physical address of CCSR on Freescale
3922 - CONFIG_SYS_CCSRBAR:
3923 Virtual address of CCSR. On a 32-bit build, this is typically
3924 the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3926 CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3927 for cross-platform code that uses that macro instead.
3929 - CONFIG_SYS_CCSRBAR_PHYS:
3930 Physical address of CCSR. CCSR can be relocated to a new
3931 physical address, if desired. In this case, this macro should
3932 be set to that address. Otherwise, it should be set to the
3933 same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
3934 is typically relocated on 36-bit builds. It is recommended
3935 that this macro be defined via the _HIGH and _LOW macros:
3937 #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3938 * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3940 - CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3941 Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
3942 either 0 (32-bit build) or 0xF (36-bit build). This macro is
3943 used in assembly code, so it must not contain typecasts or
3944 integer size suffixes (e.g. "ULL").
3946 - CONFIG_SYS_CCSRBAR_PHYS_LOW:
3947 Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
3948 used in assembly code, so it must not contain typecasts or
3949 integer size suffixes (e.g. "ULL").
3951 - CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3952 If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3953 forced to a value that ensures that CCSR is not relocated.
3955 - Floppy Disk Support:
3956 CONFIG_SYS_FDC_DRIVE_NUMBER
3958 the default drive number (default value 0)
3960 CONFIG_SYS_ISA_IO_STRIDE
3962 defines the spacing between FDC chipset registers
3965 CONFIG_SYS_ISA_IO_OFFSET
3967 defines the offset of register from address. It
3968 depends on which part of the data bus is connected to
3969 the FDC chipset. (default value 0)
3971 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
3972 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
3975 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
3976 fdc_hw_init() is called at the beginning of the FDC
3977 setup. fdc_hw_init() must be provided by the board
3978 source code. It is used to make hardware dependant
3982 Most IDE controllers were designed to be connected with PCI
3983 interface. Only few of them were designed for AHB interface.
3984 When software is doing ATA command and data transfer to
3985 IDE devices through IDE-AHB controller, some additional
3986 registers accessing to these kind of IDE-AHB controller
3989 - CONFIG_SYS_IMMR: Physical address of the Internal Memory.
3990 DO NOT CHANGE unless you know exactly what you're
3991 doing! (11-4) [MPC8xx/82xx systems only]
3993 - CONFIG_SYS_INIT_RAM_ADDR:
3995 Start address of memory area that can be used for
3996 initial data and stack; please note that this must be
3997 writable memory that is working WITHOUT special
3998 initialization, i. e. you CANNOT use normal RAM which
3999 will become available only after programming the
4000 memory controller and running certain initialization
4003 U-Boot uses the following memory types:
4004 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
4005 - MPC824X: data cache
4006 - PPC4xx: data cache
4008 - CONFIG_SYS_GBL_DATA_OFFSET:
4010 Offset of the initial data structure in the memory
4011 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
4012 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
4013 data is located at the end of the available space
4014 (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
4015 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
4016 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
4017 CONFIG_SYS_GBL_DATA_OFFSET) downward.
4020 On the MPC824X (or other systems that use the data
4021 cache for initial memory) the address chosen for
4022 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
4023 point to an otherwise UNUSED address space between
4024 the top of RAM and the start of the PCI space.
4026 - CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
4028 - CONFIG_SYS_SYPCR: System Protection Control (11-9)
4030 - CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
4032 - CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
4034 - CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
4036 - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
4038 - CONFIG_SYS_OR_TIMING_SDRAM:
4041 - CONFIG_SYS_MAMR_PTA:
4042 periodic timer for refresh
4044 - CONFIG_SYS_DER: Debug Event Register (37-47)
4046 - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
4047 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
4048 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
4049 CONFIG_SYS_BR1_PRELIM:
4050 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
4052 - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
4053 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
4054 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
4055 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
4057 - CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
4058 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
4059 Machine Mode Register and Memory Periodic Timer
4060 Prescaler definitions (SDRAM timing)
4062 - CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
4063 enable I2C microcode relocation patch (MPC8xx);
4064 define relocation offset in DPRAM [DSP2]
4066 - CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
4067 enable SMC microcode relocation patch (MPC8xx);
4068 define relocation offset in DPRAM [SMC1]
4070 - CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
4071 enable SPI microcode relocation patch (MPC8xx);
4072 define relocation offset in DPRAM [SCC4]
4074 - CONFIG_SYS_USE_OSCCLK:
4075 Use OSCM clock mode on MBX8xx board. Be careful,
4076 wrong setting might damage your board. Read
4077 doc/README.MBX before setting this variable!
4079 - CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
4080 Offset of the bootmode word in DPRAM used by post
4081 (Power On Self Tests). This definition overrides
4082 #define'd default value in commproc.h resp.
4085 - CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
4086 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
4087 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
4088 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
4089 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
4090 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
4091 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
4092 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
4093 Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
4095 - CONFIG_PCI_DISABLE_PCIE:
4096 Disable PCI-Express on systems where it is supported but not
4099 - CONFIG_PCI_ENUM_ONLY
4100 Only scan through and get the devices on the busses.
4101 Don't do any setup work, presumably because someone or
4102 something has already done it, and we don't need to do it
4103 a second time. Useful for platforms that are pre-booted
4104 by coreboot or similar.
4106 - CONFIG_PCI_INDIRECT_BRIDGE:
4107 Enable support for indirect PCI bridges.
4110 Chip has SRIO or not
4113 Board has SRIO 1 port available
4116 Board has SRIO 2 port available
4118 - CONFIG_SRIO_PCIE_BOOT_MASTER
4119 Board can support master function for Boot from SRIO and PCIE
4121 - CONFIG_SYS_SRIOn_MEM_VIRT:
4122 Virtual Address of SRIO port 'n' memory region
4124 - CONFIG_SYS_SRIOn_MEM_PHYS:
4125 Physical Address of SRIO port 'n' memory region
4127 - CONFIG_SYS_SRIOn_MEM_SIZE:
4128 Size of SRIO port 'n' memory region
4130 - CONFIG_SYS_NAND_BUSWIDTH_16BIT
4131 Defined to tell the NAND controller that the NAND chip is using
4133 Not all NAND drivers use this symbol.
4134 Example of drivers that use it:
4135 - drivers/mtd/nand/ndfc.c
4136 - drivers/mtd/nand/mxc_nand.c
4138 - CONFIG_SYS_NDFC_EBC0_CFG
4139 Sets the EBC0_CFG register for the NDFC. If not defined
4140 a default value will be used.
4143 Get DDR timing information from an I2C EEPROM. Common
4144 with pluggable memory modules such as SODIMMs
4147 I2C address of the SPD EEPROM
4149 - CONFIG_SYS_SPD_BUS_NUM
4150 If SPD EEPROM is on an I2C bus other than the first
4151 one, specify here. Note that the value must resolve
4152 to something your driver can deal with.
4154 - CONFIG_SYS_DDR_RAW_TIMING
4155 Get DDR timing information from other than SPD. Common with
4156 soldered DDR chips onboard without SPD. DDR raw timing
4157 parameters are extracted from datasheet and hard-coded into
4158 header files or board specific files.
4160 - CONFIG_FSL_DDR_INTERACTIVE
4161 Enable interactive DDR debugging. See doc/README.fsl-ddr.
4163 - CONFIG_SYS_83XX_DDR_USES_CS0
4164 Only for 83xx systems. If specified, then DDR should
4165 be configured using CS0 and CS1 instead of CS2 and CS3.
4167 - CONFIG_ETHER_ON_FEC[12]
4168 Define to enable FEC[12] on a 8xx series processor.
4170 - CONFIG_FEC[12]_PHY
4171 Define to the hardcoded PHY address which corresponds
4172 to the given FEC; i. e.
4173 #define CONFIG_FEC1_PHY 4
4174 means that the PHY with address 4 is connected to FEC1
4176 When set to -1, means to probe for first available.
4178 - CONFIG_FEC[12]_PHY_NORXERR
4179 The PHY does not have a RXERR line (RMII only).
4180 (so program the FEC to ignore it).
4183 Enable RMII mode for all FECs.
4184 Note that this is a global option, we can't
4185 have one FEC in standard MII mode and another in RMII mode.
4187 - CONFIG_CRC32_VERIFY
4188 Add a verify option to the crc32 command.
4191 => crc32 -v <address> <count> <crc32>
4193 Where address/count indicate a memory area
4194 and crc32 is the correct crc32 which the
4198 Add the "loopw" memory command. This only takes effect if
4199 the memory commands are activated globally (CONFIG_CMD_MEM).
4202 Add the "mdc" and "mwc" memory commands. These are cyclic
4207 This command will print 4 bytes (10,11,12,13) each 500 ms.
4209 => mwc.l 100 12345678 10
4210 This command will write 12345678 to address 100 all 10 ms.
4212 This only takes effect if the memory commands are activated
4213 globally (CONFIG_CMD_MEM).
4215 - CONFIG_SKIP_LOWLEVEL_INIT
4216 [ARM, NDS32, MIPS only] If this variable is defined, then certain
4217 low level initializations (like setting up the memory
4218 controller) are omitted and/or U-Boot does not
4219 relocate itself into RAM.
4221 Normally this variable MUST NOT be defined. The only
4222 exception is when U-Boot is loaded (to RAM) by some
4223 other boot loader or by a debugger which performs
4224 these initializations itself.
4227 Modifies the behaviour of start.S when compiling a loader
4228 that is executed before the actual U-Boot. E.g. when
4229 compiling a NAND SPL.
4232 Modifies the behaviour of start.S when compiling a loader
4233 that is executed after the SPL and before the actual U-Boot.
4234 It is loaded by the SPL.
4236 - CONFIG_SYS_MPC85XX_NO_RESETVEC
4237 Only for 85xx systems. If this variable is specified, the section
4238 .resetvec is not kept and the section .bootpg is placed in the
4239 previous 4k of the .text section.
4241 - CONFIG_ARCH_MAP_SYSMEM
4242 Generally U-Boot (and in particular the md command) uses
4243 effective address. It is therefore not necessary to regard
4244 U-Boot address as virtual addresses that need to be translated
4245 to physical addresses. However, sandbox requires this, since
4246 it maintains its own little RAM buffer which contains all
4247 addressable memory. This option causes some memory accesses
4248 to be mapped through map_sysmem() / unmap_sysmem().
4250 - CONFIG_USE_ARCH_MEMCPY
4251 CONFIG_USE_ARCH_MEMSET
4252 If these options are used a optimized version of memcpy/memset will
4253 be used if available. These functions may be faster under some
4254 conditions but may increase the binary size.
4256 - CONFIG_X86_RESET_VECTOR
4257 If defined, the x86 reset vector code is included. This is not
4258 needed when U-Boot is running from Coreboot.
4261 Defines the MPU clock speed (in MHz).
4263 NOTE : currently only supported on AM335x platforms.
4265 Freescale QE/FMAN Firmware Support:
4266 -----------------------------------
4268 The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4269 loading of "firmware", which is encoded in the QE firmware binary format.
4270 This firmware often needs to be loaded during U-Boot booting, so macros
4271 are used to identify the storage device (NOR flash, SPI, etc) and the address
4274 - CONFIG_SYS_QE_FMAN_FW_ADDR
4275 The address in the storage device where the firmware is located. The
4276 meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4279 - CONFIG_SYS_QE_FMAN_FW_LENGTH
4280 The maximum possible size of the firmware. The firmware binary format
4281 has a field that specifies the actual size of the firmware, but it
4282 might not be possible to read any part of the firmware unless some
4283 local storage is allocated to hold the entire firmware first.
4285 - CONFIG_SYS_QE_FMAN_FW_IN_NOR
4286 Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4287 normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the
4288 virtual address in NOR flash.
4290 - CONFIG_SYS_QE_FMAN_FW_IN_NAND
4291 Specifies that QE/FMAN firmware is located in NAND flash.
4292 CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4294 - CONFIG_SYS_QE_FMAN_FW_IN_MMC
4295 Specifies that QE/FMAN firmware is located on the primary SD/MMC
4296 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4298 - CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4299 Specifies that QE/FMAN firmware is located on the primary SPI
4300 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4302 - CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4303 Specifies that QE/FMAN firmware is located in the remote (master)
4304 memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4305 can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4306 window->master inbound window->master LAW->the ucode address in
4307 master's memory space.
4309 Building the Software:
4310 ======================
4312 Building U-Boot has been tested in several native build environments
4313 and in many different cross environments. Of course we cannot support
4314 all possibly existing versions of cross development tools in all
4315 (potentially obsolete) versions. In case of tool chain problems we
4316 recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4317 which is extensively used to build and test U-Boot.
4319 If you are not using a native environment, it is assumed that you
4320 have GNU cross compiling tools available in your path. In this case,
4321 you must set the environment variable CROSS_COMPILE in your shell.
4322 Note that no changes to the Makefile or any other source files are
4323 necessary. For example using the ELDK on a 4xx CPU, please enter:
4325 $ CROSS_COMPILE=ppc_4xx-
4326 $ export CROSS_COMPILE
4328 Note: If you wish to generate Windows versions of the utilities in
4329 the tools directory you can use the MinGW toolchain
4330 (http://www.mingw.org). Set your HOST tools to the MinGW
4331 toolchain and execute 'make tools'. For example:
4333 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
4335 Binaries such as tools/mkimage.exe will be created which can
4336 be executed on computers running Windows.
4338 U-Boot is intended to be simple to build. After installing the
4339 sources you must configure U-Boot for one specific board type. This
4344 where "NAME_config" is the name of one of the existing configu-
4345 rations; see boards.cfg for supported names.
4347 Note: for some board special configuration names may exist; check if
4348 additional information is available from the board vendor; for
4349 instance, the TQM823L systems are available without (standard)
4350 or with LCD support. You can select such additional "features"
4351 when choosing the configuration, i. e.
4354 - will configure for a plain TQM823L, i. e. no LCD support
4356 make TQM823L_LCD_config
4357 - will configure for a TQM823L with U-Boot console on LCD
4362 Finally, type "make all", and you should get some working U-Boot
4363 images ready for download to / installation on your system:
4365 - "u-boot.bin" is a raw binary image
4366 - "u-boot" is an image in ELF binary format
4367 - "u-boot.srec" is in Motorola S-Record format
4369 By default the build is performed locally and the objects are saved
4370 in the source directory. One of the two methods can be used to change
4371 this behavior and build U-Boot to some external directory:
4373 1. Add O= to the make command line invocations:
4375 make O=/tmp/build distclean
4376 make O=/tmp/build NAME_config
4377 make O=/tmp/build all
4379 2. Set environment variable BUILD_DIR to point to the desired location:
4381 export BUILD_DIR=/tmp/build
4386 Note that the command line "O=" setting overrides the BUILD_DIR environment
4390 Please be aware that the Makefiles assume you are using GNU make, so
4391 for instance on NetBSD you might need to use "gmake" instead of
4395 If the system board that you have is not listed, then you will need
4396 to port U-Boot to your hardware platform. To do this, follow these
4399 1. Add a new configuration option for your board to the toplevel
4400 "boards.cfg" file, using the existing entries as examples.
4401 Follow the instructions there to keep the boards in order.
4402 2. Create a new directory to hold your board specific code. Add any
4403 files you need. In your board directory, you will need at least
4404 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
4405 3. Create a new configuration file "include/configs/<board>.h" for
4407 3. If you're porting U-Boot to a new CPU, then also create a new
4408 directory to hold your CPU specific code. Add any files you need.
4409 4. Run "make <board>_config" with your new name.
4410 5. Type "make", and you should get a working "u-boot.srec" file
4411 to be installed on your target system.
4412 6. Debug and solve any problems that might arise.
4413 [Of course, this last step is much harder than it sounds.]
4416 Testing of U-Boot Modifications, Ports to New Hardware, etc.:
4417 ==============================================================
4419 If you have modified U-Boot sources (for instance added a new board
4420 or support for new devices, a new CPU, etc.) you are expected to
4421 provide feedback to the other developers. The feedback normally takes
4422 the form of a "patch", i. e. a context diff against a certain (latest
4423 official or latest in the git repository) version of U-Boot sources.
4425 But before you submit such a patch, please verify that your modifi-
4426 cation did not break existing code. At least make sure that *ALL* of
4427 the supported boards compile WITHOUT ANY compiler warnings. To do so,
4428 just run the "MAKEALL" script, which will configure and build U-Boot
4429 for ALL supported system. Be warned, this will take a while. You can
4430 select which (cross) compiler to use by passing a `CROSS_COMPILE'
4431 environment variable to the script, i. e. to use the ELDK cross tools
4434 CROSS_COMPILE=ppc_8xx- MAKEALL
4436 or to build on a native PowerPC system you can type
4438 CROSS_COMPILE=' ' MAKEALL
4440 When using the MAKEALL script, the default behaviour is to build
4441 U-Boot in the source directory. This location can be changed by
4442 setting the BUILD_DIR environment variable. Also, for each target
4443 built, the MAKEALL script saves two log files (<target>.ERR and
4444 <target>.MAKEALL) in the <source dir>/LOG directory. This default
4445 location can be changed by setting the MAKEALL_LOGDIR environment
4446 variable. For example:
4448 export BUILD_DIR=/tmp/build
4449 export MAKEALL_LOGDIR=/tmp/log
4450 CROSS_COMPILE=ppc_8xx- MAKEALL
4452 With the above settings build objects are saved in the /tmp/build,
4453 log files are saved in the /tmp/log and the source tree remains clean
4454 during the whole build process.
4457 See also "U-Boot Porting Guide" below.
4460 Monitor Commands - Overview:
4461 ============================
4463 go - start application at address 'addr'
4464 run - run commands in an environment variable
4465 bootm - boot application image from memory
4466 bootp - boot image via network using BootP/TFTP protocol
4467 bootz - boot zImage from memory
4468 tftpboot- boot image via network using TFTP protocol
4469 and env variables "ipaddr" and "serverip"
4470 (and eventually "gatewayip")
4471 tftpput - upload a file via network using TFTP protocol
4472 rarpboot- boot image via network using RARP/TFTP protocol
4473 diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
4474 loads - load S-Record file over serial line
4475 loadb - load binary file over serial line (kermit mode)
4477 mm - memory modify (auto-incrementing)
4478 nm - memory modify (constant address)
4479 mw - memory write (fill)
4481 cmp - memory compare
4482 crc32 - checksum calculation
4483 i2c - I2C sub-system
4484 sspi - SPI utility commands
4485 base - print or set address offset
4486 printenv- print environment variables
4487 setenv - set environment variables
4488 saveenv - save environment variables to persistent storage
4489 protect - enable or disable FLASH write protection
4490 erase - erase FLASH memory
4491 flinfo - print FLASH memory information
4492 nand - NAND memory operations (see doc/README.nand)
4493 bdinfo - print Board Info structure
4494 iminfo - print header information for application image
4495 coninfo - print console devices and informations
4496 ide - IDE sub-system
4497 loop - infinite loop on address range
4498 loopw - infinite write loop on address range
4499 mtest - simple RAM test
4500 icache - enable or disable instruction cache
4501 dcache - enable or disable data cache
4502 reset - Perform RESET of the CPU
4503 echo - echo args to console
4504 version - print monitor version
4505 help - print online help
4506 ? - alias for 'help'
4509 Monitor Commands - Detailed Description:
4510 ========================================
4514 For now: just type "help <command>".
4517 Environment Variables:
4518 ======================
4520 U-Boot supports user configuration using Environment Variables which
4521 can be made persistent by saving to Flash memory.
4523 Environment Variables are set using "setenv", printed using
4524 "printenv", and saved to Flash using "saveenv". Using "setenv"
4525 without a value can be used to delete a variable from the
4526 environment. As long as you don't save the environment you are
4527 working with an in-memory copy. In case the Flash area containing the
4528 environment is erased by accident, a default environment is provided.
4530 Some configuration options can be set using Environment Variables.
4532 List of environment variables (most likely not complete):
4534 baudrate - see CONFIG_BAUDRATE
4536 bootdelay - see CONFIG_BOOTDELAY
4538 bootcmd - see CONFIG_BOOTCOMMAND
4540 bootargs - Boot arguments when booting an RTOS image
4542 bootfile - Name of the image to load with TFTP
4544 bootm_low - Memory range available for image processing in the bootm
4545 command can be restricted. This variable is given as
4546 a hexadecimal number and defines lowest address allowed
4547 for use by the bootm command. See also "bootm_size"
4548 environment variable. Address defined by "bootm_low" is
4549 also the base of the initial memory mapping for the Linux
4550 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4553 bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
4554 This variable is given as a hexadecimal number and it
4555 defines the size of the memory region starting at base
4556 address bootm_low that is accessible by the Linux kernel
4557 during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
4558 as the default value if it is defined, and bootm_size is
4561 bootm_size - Memory range available for image processing in the bootm
4562 command can be restricted. This variable is given as
4563 a hexadecimal number and defines the size of the region
4564 allowed for use by the bootm command. See also "bootm_low"
4565 environment variable.
4567 updatefile - Location of the software update file on a TFTP server, used
4568 by the automatic software update feature. Please refer to
4569 documentation in doc/README.update for more details.
4571 autoload - if set to "no" (any string beginning with 'n'),
4572 "bootp" will just load perform a lookup of the
4573 configuration from the BOOTP server, but not try to
4574 load any image using TFTP
4576 autostart - if set to "yes", an image loaded using the "bootp",
4577 "rarpboot", "tftpboot" or "diskboot" commands will
4578 be automatically started (by internally calling
4581 If set to "no", a standalone image passed to the
4582 "bootm" command will be copied to the load address
4583 (and eventually uncompressed), but NOT be started.
4584 This can be used to load and uncompress arbitrary
4587 fdt_high - if set this restricts the maximum address that the
4588 flattened device tree will be copied into upon boot.
4589 For example, if you have a system with 1 GB memory
4590 at physical address 0x10000000, while Linux kernel
4591 only recognizes the first 704 MB as low memory, you
4592 may need to set fdt_high as 0x3C000000 to have the
4593 device tree blob be copied to the maximum address
4594 of the 704 MB low memory, so that Linux kernel can
4595 access it during the boot procedure.
4597 If this is set to the special value 0xFFFFFFFF then
4598 the fdt will not be copied at all on boot. For this
4599 to work it must reside in writable memory, have
4600 sufficient padding on the end of it for u-boot to
4601 add the information it needs into it, and the memory
4602 must be accessible by the kernel.
4604 fdtcontroladdr- if set this is the address of the control flattened
4605 device tree used by U-Boot when CONFIG_OF_CONTROL is
4608 i2cfast - (PPC405GP|PPC405EP only)
4609 if set to 'y' configures Linux I2C driver for fast
4610 mode (400kHZ). This environment variable is used in
4611 initialization code. So, for changes to be effective
4612 it must be saved and board must be reset.
4614 initrd_high - restrict positioning of initrd images:
4615 If this variable is not set, initrd images will be
4616 copied to the highest possible address in RAM; this
4617 is usually what you want since it allows for
4618 maximum initrd size. If for some reason you want to
4619 make sure that the initrd image is loaded below the
4620 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4621 variable to a value of "no" or "off" or "0".
4622 Alternatively, you can set it to a maximum upper
4623 address to use (U-Boot will still check that it
4624 does not overwrite the U-Boot stack and data).
4626 For instance, when you have a system with 16 MB
4627 RAM, and want to reserve 4 MB from use by Linux,
4628 you can do this by adding "mem=12M" to the value of
4629 the "bootargs" variable. However, now you must make
4630 sure that the initrd image is placed in the first
4631 12 MB as well - this can be done with
4633 setenv initrd_high 00c00000
4635 If you set initrd_high to 0xFFFFFFFF, this is an
4636 indication to U-Boot that all addresses are legal
4637 for the Linux kernel, including addresses in flash
4638 memory. In this case U-Boot will NOT COPY the
4639 ramdisk at all. This may be useful to reduce the
4640 boot time on your system, but requires that this
4641 feature is supported by your Linux kernel.
4643 ipaddr - IP address; needed for tftpboot command
4645 loadaddr - Default load address for commands like "bootp",
4646 "rarpboot", "tftpboot", "loadb" or "diskboot"
4648 loads_echo - see CONFIG_LOADS_ECHO
4650 serverip - TFTP server IP address; needed for tftpboot command
4652 bootretry - see CONFIG_BOOT_RETRY_TIME
4654 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
4656 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
4658 ethprime - controls which interface is used first.
4660 ethact - controls which interface is currently active.
4661 For example you can do the following
4663 => setenv ethact FEC
4664 => ping 192.168.0.1 # traffic sent on FEC
4665 => setenv ethact SCC
4666 => ping 10.0.0.1 # traffic sent on SCC
4668 ethrotate - When set to "no" U-Boot does not go through all
4669 available network interfaces.
4670 It just stays at the currently selected interface.
4672 netretry - When set to "no" each network operation will
4673 either succeed or fail without retrying.
4674 When set to "once" the network operation will
4675 fail when all the available network interfaces
4676 are tried once without success.
4677 Useful on scripts which control the retry operation
4680 npe_ucode - set load address for the NPE microcode
4682 silent_linux - If set then linux will be told to boot silently, by
4683 changing the console to be empty. If "yes" it will be
4684 made silent. If "no" it will not be made silent. If
4685 unset, then it will be made silent if the U-Boot console
4688 tftpsrcport - If this is set, the value is used for TFTP's
4691 tftpdstport - If this is set, the value is used for TFTP's UDP
4692 destination port instead of the Well Know Port 69.
4694 tftpblocksize - Block size to use for TFTP transfers; if not set,
4695 we use the TFTP server's default block size
4697 tftptimeout - Retransmission timeout for TFTP packets (in milli-
4698 seconds, minimum value is 1000 = 1 second). Defines
4699 when a packet is considered to be lost so it has to
4700 be retransmitted. The default is 5000 = 5 seconds.
4701 Lowering this value may make downloads succeed
4702 faster in networks with high packet loss rates or
4703 with unreliable TFTP servers.
4705 vlan - When set to a value < 4095 the traffic over
4706 Ethernet is encapsulated/received over 802.1q
4709 The following image location variables contain the location of images
4710 used in booting. The "Image" column gives the role of the image and is
4711 not an environment variable name. The other columns are environment
4712 variable names. "File Name" gives the name of the file on a TFTP
4713 server, "RAM Address" gives the location in RAM the image will be
4714 loaded to, and "Flash Location" gives the image's address in NOR
4715 flash or offset in NAND flash.
4717 *Note* - these variables don't have to be defined for all boards, some
4718 boards currenlty use other variables for these purposes, and some
4719 boards use these variables for other purposes.
4721 Image File Name RAM Address Flash Location
4722 ----- --------- ----------- --------------
4723 u-boot u-boot u-boot_addr_r u-boot_addr
4724 Linux kernel bootfile kernel_addr_r kernel_addr
4725 device tree blob fdtfile fdt_addr_r fdt_addr
4726 ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr
4728 The following environment variables may be used and automatically
4729 updated by the network boot commands ("bootp" and "rarpboot"),
4730 depending the information provided by your boot server:
4732 bootfile - see above
4733 dnsip - IP address of your Domain Name Server
4734 dnsip2 - IP address of your secondary Domain Name Server
4735 gatewayip - IP address of the Gateway (Router) to use
4736 hostname - Target hostname
4738 netmask - Subnet Mask
4739 rootpath - Pathname of the root filesystem on the NFS server
4740 serverip - see above
4743 There are two special Environment Variables:
4745 serial# - contains hardware identification information such
4746 as type string and/or serial number
4747 ethaddr - Ethernet address
4749 These variables can be set only once (usually during manufacturing of
4750 the board). U-Boot refuses to delete or overwrite these variables
4751 once they have been set once.
4754 Further special Environment Variables:
4756 ver - Contains the U-Boot version string as printed
4757 with the "version" command. This variable is
4758 readonly (see CONFIG_VERSION_VARIABLE).
4761 Please note that changes to some configuration parameters may take
4762 only effect after the next boot (yes, that's just like Windoze :-).
4765 Callback functions for environment variables:
4766 ---------------------------------------------
4768 For some environment variables, the behavior of u-boot needs to change
4769 when their values are changed. This functionailty allows functions to
4770 be associated with arbitrary variables. On creation, overwrite, or
4771 deletion, the callback will provide the opportunity for some side
4772 effect to happen or for the change to be rejected.
4774 The callbacks are named and associated with a function using the
4775 U_BOOT_ENV_CALLBACK macro in your board or driver code.
4777 These callbacks are associated with variables in one of two ways. The
4778 static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4779 in the board configuration to a string that defines a list of
4780 associations. The list must be in the following format:
4782 entry = variable_name[:callback_name]
4785 If the callback name is not specified, then the callback is deleted.
4786 Spaces are also allowed anywhere in the list.
4788 Callbacks can also be associated by defining the ".callbacks" variable
4789 with the same list format above. Any association in ".callbacks" will
4790 override any association in the static list. You can define
4791 CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4792 ".callbacks" envirnoment variable in the default or embedded environment.
4795 Command Line Parsing:
4796 =====================
4798 There are two different command line parsers available with U-Boot:
4799 the old "simple" one, and the much more powerful "hush" shell:
4801 Old, simple command line parser:
4802 --------------------------------
4804 - supports environment variables (through setenv / saveenv commands)
4805 - several commands on one line, separated by ';'
4806 - variable substitution using "... ${name} ..." syntax
4807 - special characters ('$', ';') can be escaped by prefixing with '\',
4809 setenv bootcmd bootm \${address}
4810 - You can also escape text by enclosing in single apostrophes, for example:
4811 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4816 - similar to Bourne shell, with control structures like
4817 if...then...else...fi, for...do...done; while...do...done,
4818 until...do...done, ...
4819 - supports environment ("global") variables (through setenv / saveenv
4820 commands) and local shell variables (through standard shell syntax
4821 "name=value"); only environment variables can be used with "run"
4827 (1) If a command line (or an environment variable executed by a "run"
4828 command) contains several commands separated by semicolon, and
4829 one of these commands fails, then the remaining commands will be
4832 (2) If you execute several variables with one call to run (i. e.
4833 calling run with a list of variables as arguments), any failing
4834 command will cause "run" to terminate, i. e. the remaining
4835 variables are not executed.
4837 Note for Redundant Ethernet Interfaces:
4838 =======================================
4840 Some boards come with redundant Ethernet interfaces; U-Boot supports
4841 such configurations and is capable of automatic selection of a
4842 "working" interface when needed. MAC assignment works as follows:
4844 Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
4845 MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4846 "eth1addr" (=>eth1), "eth2addr", ...
4848 If the network interface stores some valid MAC address (for instance
4849 in SROM), this is used as default address if there is NO correspon-
4850 ding setting in the environment; if the corresponding environment
4851 variable is set, this overrides the settings in the card; that means:
4853 o If the SROM has a valid MAC address, and there is no address in the
4854 environment, the SROM's address is used.
4856 o If there is no valid address in the SROM, and a definition in the
4857 environment exists, then the value from the environment variable is
4860 o If both the SROM and the environment contain a MAC address, and
4861 both addresses are the same, this MAC address is used.
4863 o If both the SROM and the environment contain a MAC address, and the
4864 addresses differ, the value from the environment is used and a
4867 o If neither SROM nor the environment contain a MAC address, an error
4870 If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4871 will be programmed into hardware as part of the initialization process. This
4872 may be skipped by setting the appropriate 'ethmacskip' environment variable.
4873 The naming convention is as follows:
4874 "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4879 U-Boot is capable of booting (and performing other auxiliary operations on)
4880 images in two formats:
4882 New uImage format (FIT)
4883 -----------------------
4885 Flexible and powerful format based on Flattened Image Tree -- FIT (similar
4886 to Flattened Device Tree). It allows the use of images with multiple
4887 components (several kernels, ramdisks, etc.), with contents protected by
4888 SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
4894 Old image format is based on binary files which can be basically anything,
4895 preceded by a special header; see the definitions in include/image.h for
4896 details; basically, the header defines the following image properties:
4898 * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4899 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4900 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4901 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4903 * Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4904 IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4905 Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4906 * Compression Type (uncompressed, gzip, bzip2)
4912 The header is marked by a special Magic Number, and both the header
4913 and the data portions of the image are secured against corruption by
4920 Although U-Boot should support any OS or standalone application
4921 easily, the main focus has always been on Linux during the design of
4924 U-Boot includes many features that so far have been part of some
4925 special "boot loader" code within the Linux kernel. Also, any
4926 "initrd" images to be used are no longer part of one big Linux image;
4927 instead, kernel and "initrd" are separate images. This implementation
4928 serves several purposes:
4930 - the same features can be used for other OS or standalone
4931 applications (for instance: using compressed images to reduce the
4932 Flash memory footprint)
4934 - it becomes much easier to port new Linux kernel versions because
4935 lots of low-level, hardware dependent stuff are done by U-Boot
4937 - the same Linux kernel image can now be used with different "initrd"
4938 images; of course this also means that different kernel images can
4939 be run with the same "initrd". This makes testing easier (you don't
4940 have to build a new "zImage.initrd" Linux image when you just
4941 change a file in your "initrd"). Also, a field-upgrade of the
4942 software is easier now.
4948 Porting Linux to U-Boot based systems:
4949 ---------------------------------------
4951 U-Boot cannot save you from doing all the necessary modifications to
4952 configure the Linux device drivers for use with your target hardware
4953 (no, we don't intend to provide a full virtual machine interface to
4956 But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4958 Just make sure your machine specific header file (for instance
4959 include/asm-ppc/tqm8xx.h) includes the same definition of the Board
4960 Information structure as we define in include/asm-<arch>/u-boot.h,
4961 and make sure that your definition of IMAP_ADDR uses the same value
4962 as your U-Boot configuration in CONFIG_SYS_IMMR.
4965 Configuring the Linux kernel:
4966 -----------------------------
4968 No specific requirements for U-Boot. Make sure you have some root
4969 device (initial ramdisk, NFS) for your target system.
4972 Building a Linux Image:
4973 -----------------------
4975 With U-Boot, "normal" build targets like "zImage" or "bzImage" are
4976 not used. If you use recent kernel source, a new build target
4977 "uImage" will exist which automatically builds an image usable by
4978 U-Boot. Most older kernels also have support for a "pImage" target,
4979 which was introduced for our predecessor project PPCBoot and uses a
4980 100% compatible format.
4989 The "uImage" build target uses a special tool (in 'tools/mkimage') to
4990 encapsulate a compressed Linux kernel image with header information,
4991 CRC32 checksum etc. for use with U-Boot. This is what we are doing:
4993 * build a standard "vmlinux" kernel image (in ELF binary format):
4995 * convert the kernel into a raw binary image:
4997 ${CROSS_COMPILE}-objcopy -O binary \
4998 -R .note -R .comment \
4999 -S vmlinux linux.bin
5001 * compress the binary image:
5005 * package compressed binary image for U-Boot:
5007 mkimage -A ppc -O linux -T kernel -C gzip \
5008 -a 0 -e 0 -n "Linux Kernel Image" \
5009 -d linux.bin.gz uImage
5012 The "mkimage" tool can also be used to create ramdisk images for use
5013 with U-Boot, either separated from the Linux kernel image, or
5014 combined into one file. "mkimage" encapsulates the images with a 64
5015 byte header containing information about target architecture,
5016 operating system, image type, compression method, entry points, time
5017 stamp, CRC32 checksums, etc.
5019 "mkimage" can be called in two ways: to verify existing images and
5020 print the header information, or to build new images.
5022 In the first form (with "-l" option) mkimage lists the information
5023 contained in the header of an existing U-Boot image; this includes
5024 checksum verification:
5026 tools/mkimage -l image
5027 -l ==> list image header information
5029 The second form (with "-d" option) is used to build a U-Boot image
5030 from a "data file" which is used as image payload:
5032 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
5033 -n name -d data_file image
5034 -A ==> set architecture to 'arch'
5035 -O ==> set operating system to 'os'
5036 -T ==> set image type to 'type'
5037 -C ==> set compression type 'comp'
5038 -a ==> set load address to 'addr' (hex)
5039 -e ==> set entry point to 'ep' (hex)
5040 -n ==> set image name to 'name'
5041 -d ==> use image data from 'datafile'
5043 Right now, all Linux kernels for PowerPC systems use the same load
5044 address (0x00000000), but the entry point address depends on the
5047 - 2.2.x kernels have the entry point at 0x0000000C,
5048 - 2.3.x and later kernels have the entry point at 0x00000000.
5050 So a typical call to build a U-Boot image would read:
5052 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
5053 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
5054 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
5055 > examples/uImage.TQM850L
5056 Image Name: 2.4.4 kernel for TQM850L
5057 Created: Wed Jul 19 02:34:59 2000
5058 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5059 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
5060 Load Address: 0x00000000
5061 Entry Point: 0x00000000
5063 To verify the contents of the image (or check for corruption):
5065 -> tools/mkimage -l examples/uImage.TQM850L
5066 Image Name: 2.4.4 kernel for TQM850L
5067 Created: Wed Jul 19 02:34:59 2000
5068 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5069 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
5070 Load Address: 0x00000000
5071 Entry Point: 0x00000000
5073 NOTE: for embedded systems where boot time is critical you can trade
5074 speed for memory and install an UNCOMPRESSED image instead: this
5075 needs more space in Flash, but boots much faster since it does not
5076 need to be uncompressed:
5078 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
5079 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
5080 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
5081 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
5082 > examples/uImage.TQM850L-uncompressed
5083 Image Name: 2.4.4 kernel for TQM850L
5084 Created: Wed Jul 19 02:34:59 2000
5085 Image Type: PowerPC Linux Kernel Image (uncompressed)
5086 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
5087 Load Address: 0x00000000
5088 Entry Point: 0x00000000
5091 Similar you can build U-Boot images from a 'ramdisk.image.gz' file
5092 when your kernel is intended to use an initial ramdisk:
5094 -> tools/mkimage -n 'Simple Ramdisk Image' \
5095 > -A ppc -O linux -T ramdisk -C gzip \
5096 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
5097 Image Name: Simple Ramdisk Image
5098 Created: Wed Jan 12 14:01:50 2000
5099 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
5100 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
5101 Load Address: 0x00000000
5102 Entry Point: 0x00000000
5105 Installing a Linux Image:
5106 -------------------------
5108 To downloading a U-Boot image over the serial (console) interface,
5109 you must convert the image to S-Record format:
5111 objcopy -I binary -O srec examples/image examples/image.srec
5113 The 'objcopy' does not understand the information in the U-Boot
5114 image header, so the resulting S-Record file will be relative to
5115 address 0x00000000. To load it to a given address, you need to
5116 specify the target address as 'offset' parameter with the 'loads'
5119 Example: install the image to address 0x40100000 (which on the
5120 TQM8xxL is in the first Flash bank):
5122 => erase 40100000 401FFFFF
5128 ## Ready for S-Record download ...
5129 ~>examples/image.srec
5130 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5132 15989 15990 15991 15992
5133 [file transfer complete]
5135 ## Start Addr = 0x00000000
5138 You can check the success of the download using the 'iminfo' command;
5139 this includes a checksum verification so you can be sure no data
5140 corruption happened:
5144 ## Checking Image at 40100000 ...
5145 Image Name: 2.2.13 for initrd on TQM850L
5146 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5147 Data Size: 335725 Bytes = 327 kB = 0 MB
5148 Load Address: 00000000
5149 Entry Point: 0000000c
5150 Verifying Checksum ... OK
5156 The "bootm" command is used to boot an application that is stored in
5157 memory (RAM or Flash). In case of a Linux kernel image, the contents
5158 of the "bootargs" environment variable is passed to the kernel as
5159 parameters. You can check and modify this variable using the
5160 "printenv" and "setenv" commands:
5163 => printenv bootargs
5164 bootargs=root=/dev/ram
5166 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5168 => printenv bootargs
5169 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5172 ## Booting Linux kernel at 40020000 ...
5173 Image Name: 2.2.13 for NFS on TQM850L
5174 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5175 Data Size: 381681 Bytes = 372 kB = 0 MB
5176 Load Address: 00000000
5177 Entry Point: 0000000c
5178 Verifying Checksum ... OK
5179 Uncompressing Kernel Image ... OK
5180 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
5181 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5182 time_init: decrementer frequency = 187500000/60
5183 Calibrating delay loop... 49.77 BogoMIPS
5184 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5187 If you want to boot a Linux kernel with initial RAM disk, you pass
5188 the memory addresses of both the kernel and the initrd image (PPBCOOT
5189 format!) to the "bootm" command:
5191 => imi 40100000 40200000
5193 ## Checking Image at 40100000 ...
5194 Image Name: 2.2.13 for initrd on TQM850L
5195 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5196 Data Size: 335725 Bytes = 327 kB = 0 MB
5197 Load Address: 00000000
5198 Entry Point: 0000000c
5199 Verifying Checksum ... OK
5201 ## Checking Image at 40200000 ...
5202 Image Name: Simple Ramdisk Image
5203 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
5204 Data Size: 566530 Bytes = 553 kB = 0 MB
5205 Load Address: 00000000
5206 Entry Point: 00000000
5207 Verifying Checksum ... OK
5209 => bootm 40100000 40200000
5210 ## Booting Linux kernel at 40100000 ...
5211 Image Name: 2.2.13 for initrd on TQM850L
5212 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5213 Data Size: 335725 Bytes = 327 kB = 0 MB
5214 Load Address: 00000000
5215 Entry Point: 0000000c
5216 Verifying Checksum ... OK
5217 Uncompressing Kernel Image ... OK
5218 ## Loading RAMDisk Image at 40200000 ...
5219 Image Name: Simple Ramdisk Image
5220 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
5221 Data Size: 566530 Bytes = 553 kB = 0 MB
5222 Load Address: 00000000
5223 Entry Point: 00000000
5224 Verifying Checksum ... OK
5225 Loading Ramdisk ... OK
5226 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
5227 Boot arguments: root=/dev/ram
5228 time_init: decrementer frequency = 187500000/60
5229 Calibrating delay loop... 49.77 BogoMIPS
5231 RAMDISK: Compressed image found at block 0
5232 VFS: Mounted root (ext2 filesystem).
5236 Boot Linux and pass a flat device tree:
5239 First, U-Boot must be compiled with the appropriate defines. See the section
5240 titled "Linux Kernel Interface" above for a more in depth explanation. The
5241 following is an example of how to start a kernel and pass an updated
5247 oft=oftrees/mpc8540ads.dtb
5248 => tftp $oftaddr $oft
5249 Speed: 1000, full duplex
5251 TFTP from server 192.168.1.1; our IP address is 192.168.1.101
5252 Filename 'oftrees/mpc8540ads.dtb'.
5253 Load address: 0x300000
5256 Bytes transferred = 4106 (100a hex)
5257 => tftp $loadaddr $bootfile
5258 Speed: 1000, full duplex
5260 TFTP from server 192.168.1.1; our IP address is 192.168.1.2
5262 Load address: 0x200000
5263 Loading:############
5265 Bytes transferred = 1029407 (fb51f hex)
5270 => bootm $loadaddr - $oftaddr
5271 ## Booting image at 00200000 ...
5272 Image Name: Linux-2.6.17-dirty
5273 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5274 Data Size: 1029343 Bytes = 1005.2 kB
5275 Load Address: 00000000
5276 Entry Point: 00000000
5277 Verifying Checksum ... OK
5278 Uncompressing Kernel Image ... OK
5279 Booting using flat device tree at 0x300000
5280 Using MPC85xx ADS machine description
5281 Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
5285 More About U-Boot Image Types:
5286 ------------------------------
5288 U-Boot supports the following image types:
5290 "Standalone Programs" are directly runnable in the environment
5291 provided by U-Boot; it is expected that (if they behave
5292 well) you can continue to work in U-Boot after return from
5293 the Standalone Program.
5294 "OS Kernel Images" are usually images of some Embedded OS which
5295 will take over control completely. Usually these programs
5296 will install their own set of exception handlers, device
5297 drivers, set up the MMU, etc. - this means, that you cannot
5298 expect to re-enter U-Boot except by resetting the CPU.
5299 "RAMDisk Images" are more or less just data blocks, and their
5300 parameters (address, size) are passed to an OS kernel that is
5302 "Multi-File Images" contain several images, typically an OS
5303 (Linux) kernel image and one or more data images like
5304 RAMDisks. This construct is useful for instance when you want
5305 to boot over the network using BOOTP etc., where the boot
5306 server provides just a single image file, but you want to get
5307 for instance an OS kernel and a RAMDisk image.
5309 "Multi-File Images" start with a list of image sizes, each
5310 image size (in bytes) specified by an "uint32_t" in network
5311 byte order. This list is terminated by an "(uint32_t)0".
5312 Immediately after the terminating 0 follow the images, one by
5313 one, all aligned on "uint32_t" boundaries (size rounded up to
5314 a multiple of 4 bytes).
5316 "Firmware Images" are binary images containing firmware (like
5317 U-Boot or FPGA images) which usually will be programmed to
5320 "Script files" are command sequences that will be executed by
5321 U-Boot's command interpreter; this feature is especially
5322 useful when you configure U-Boot to use a real shell (hush)
5323 as command interpreter.
5325 Booting the Linux zImage:
5326 -------------------------
5328 On some platforms, it's possible to boot Linux zImage. This is done
5329 using the "bootz" command. The syntax of "bootz" command is the same
5330 as the syntax of "bootm" command.
5332 Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
5333 kernel with raw initrd images. The syntax is slightly different, the
5334 address of the initrd must be augmented by it's size, in the following
5335 format: "<initrd addres>:<initrd size>".
5341 One of the features of U-Boot is that you can dynamically load and
5342 run "standalone" applications, which can use some resources of
5343 U-Boot like console I/O functions or interrupt services.
5345 Two simple examples are included with the sources:
5350 'examples/hello_world.c' contains a small "Hello World" Demo
5351 application; it is automatically compiled when you build U-Boot.
5352 It's configured to run at address 0x00040004, so you can play with it
5356 ## Ready for S-Record download ...
5357 ~>examples/hello_world.srec
5358 1 2 3 4 5 6 7 8 9 10 11 ...
5359 [file transfer complete]
5361 ## Start Addr = 0x00040004
5363 => go 40004 Hello World! This is a test.
5364 ## Starting application at 0x00040004 ...
5375 Hit any key to exit ...
5377 ## Application terminated, rc = 0x0
5379 Another example, which demonstrates how to register a CPM interrupt
5380 handler with the U-Boot code, can be found in 'examples/timer.c'.
5381 Here, a CPM timer is set up to generate an interrupt every second.
5382 The interrupt service routine is trivial, just printing a '.'
5383 character, but this is just a demo program. The application can be
5384 controlled by the following keys:
5386 ? - print current values og the CPM Timer registers
5387 b - enable interrupts and start timer
5388 e - stop timer and disable interrupts
5389 q - quit application
5392 ## Ready for S-Record download ...
5393 ~>examples/timer.srec
5394 1 2 3 4 5 6 7 8 9 10 11 ...
5395 [file transfer complete]
5397 ## Start Addr = 0x00040004
5400 ## Starting application at 0x00040004 ...
5403 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5406 [q, b, e, ?] Set interval 1000000 us
5409 [q, b, e, ?] ........
5410 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5413 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5416 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5419 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5421 [q, b, e, ?] ...Stopping timer
5423 [q, b, e, ?] ## Application terminated, rc = 0x0
5429 Over time, many people have reported problems when trying to use the
5430 "minicom" terminal emulation program for serial download. I (wd)
5431 consider minicom to be broken, and recommend not to use it. Under
5432 Unix, I recommend to use C-Kermit for general purpose use (and
5433 especially for kermit binary protocol download ("loadb" command), and
5434 use "cu" for S-Record download ("loads" command). See
5435 http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5436 for help with kermit.
5439 Nevertheless, if you absolutely want to use it try adding this
5440 configuration to your "File transfer protocols" section:
5442 Name Program Name U/D FullScr IO-Red. Multi
5443 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
5444 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
5450 Starting at version 0.9.2, U-Boot supports NetBSD both as host
5451 (build U-Boot) and target system (boots NetBSD/mpc8xx).
5453 Building requires a cross environment; it is known to work on
5454 NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5455 need gmake since the Makefiles are not compatible with BSD make).
5456 Note that the cross-powerpc package does not install include files;
5457 attempting to build U-Boot will fail because <machine/ansi.h> is
5458 missing. This file has to be installed and patched manually:
5460 # cd /usr/pkg/cross/powerpc-netbsd/include
5462 # ln -s powerpc machine
5463 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5464 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
5466 Native builds *don't* work due to incompatibilities between native
5467 and U-Boot include files.
5469 Booting assumes that (the first part of) the image booted is a
5470 stage-2 loader which in turn loads and then invokes the kernel
5471 proper. Loader sources will eventually appear in the NetBSD source
5472 tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
5473 meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5476 Implementation Internals:
5477 =========================
5479 The following is not intended to be a complete description of every
5480 implementation detail. However, it should help to understand the
5481 inner workings of U-Boot and make it easier to port it to custom
5485 Initial Stack, Global Data:
5486 ---------------------------
5488 The implementation of U-Boot is complicated by the fact that U-Boot
5489 starts running out of ROM (flash memory), usually without access to
5490 system RAM (because the memory controller is not initialized yet).
5491 This means that we don't have writable Data or BSS segments, and BSS
5492 is not initialized as zero. To be able to get a C environment working
5493 at all, we have to allocate at least a minimal stack. Implementation
5494 options for this are defined and restricted by the CPU used: Some CPU
5495 models provide on-chip memory (like the IMMR area on MPC8xx and
5496 MPC826x processors), on others (parts of) the data cache can be
5497 locked as (mis-) used as memory, etc.
5499 Chris Hallinan posted a good summary of these issues to the
5500 U-Boot mailing list:
5502 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
5503 From: "Chris Hallinan" <clh@net1plus.com>
5504 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
5507 Correct me if I'm wrong, folks, but the way I understand it
5508 is this: Using DCACHE as initial RAM for Stack, etc, does not
5509 require any physical RAM backing up the cache. The cleverness
5510 is that the cache is being used as a temporary supply of
5511 necessary storage before the SDRAM controller is setup. It's
5512 beyond the scope of this list to explain the details, but you
5513 can see how this works by studying the cache architecture and
5514 operation in the architecture and processor-specific manuals.
5516 OCM is On Chip Memory, which I believe the 405GP has 4K. It
5517 is another option for the system designer to use as an
5518 initial stack/RAM area prior to SDRAM being available. Either
5519 option should work for you. Using CS 4 should be fine if your
5520 board designers haven't used it for something that would
5521 cause you grief during the initial boot! It is frequently not
5524 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
5525 with your processor/board/system design. The default value
5526 you will find in any recent u-boot distribution in
5527 walnut.h should work for you. I'd set it to a value larger
5528 than your SDRAM module. If you have a 64MB SDRAM module, set
5529 it above 400_0000. Just make sure your board has no resources
5530 that are supposed to respond to that address! That code in
5531 start.S has been around a while and should work as is when
5532 you get the config right.
5537 It is essential to remember this, since it has some impact on the C
5538 code for the initialization procedures:
5540 * Initialized global data (data segment) is read-only. Do not attempt
5543 * Do not use any uninitialized global data (or implicitely initialized
5544 as zero data - BSS segment) at all - this is undefined, initiali-
5545 zation is performed later (when relocating to RAM).
5547 * Stack space is very limited. Avoid big data buffers or things like
5550 Having only the stack as writable memory limits means we cannot use
5551 normal global data to share information beween the code. But it
5552 turned out that the implementation of U-Boot can be greatly
5553 simplified by making a global data structure (gd_t) available to all
5554 functions. We could pass a pointer to this data as argument to _all_
5555 functions, but this would bloat the code. Instead we use a feature of
5556 the GCC compiler (Global Register Variables) to share the data: we
5557 place a pointer (gd) to the global data into a register which we
5558 reserve for this purpose.
5560 When choosing a register for such a purpose we are restricted by the
5561 relevant (E)ABI specifications for the current architecture, and by
5562 GCC's implementation.
5564 For PowerPC, the following registers have specific use:
5566 R2: reserved for system use
5567 R3-R4: parameter passing and return values
5568 R5-R10: parameter passing
5569 R13: small data area pointer
5573 (U-Boot also uses R12 as internal GOT pointer. r12
5574 is a volatile register so r12 needs to be reset when
5575 going back and forth between asm and C)
5577 ==> U-Boot will use R2 to hold a pointer to the global data
5579 Note: on PPC, we could use a static initializer (since the
5580 address of the global data structure is known at compile time),
5581 but it turned out that reserving a register results in somewhat
5582 smaller code - although the code savings are not that big (on
5583 average for all boards 752 bytes for the whole U-Boot image,
5584 624 text + 127 data).
5586 On Blackfin, the normal C ABI (except for P3) is followed as documented here:
5587 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
5589 ==> U-Boot will use P3 to hold a pointer to the global data
5591 On ARM, the following registers are used:
5593 R0: function argument word/integer result
5594 R1-R3: function argument word
5596 R10: stack limit (used only if stack checking if enabled)
5597 R11: argument (frame) pointer
5598 R12: temporary workspace
5601 R15: program counter
5603 ==> U-Boot will use R8 to hold a pointer to the global data
5605 On Nios II, the ABI is documented here:
5606 http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
5608 ==> U-Boot will use gp to hold a pointer to the global data
5610 Note: on Nios II, we give "-G0" option to gcc and don't use gp
5611 to access small data sections, so gp is free.
5613 On NDS32, the following registers are used:
5615 R0-R1: argument/return
5617 R15: temporary register for assembler
5618 R16: trampoline register
5619 R28: frame pointer (FP)
5620 R29: global pointer (GP)
5621 R30: link register (LP)
5622 R31: stack pointer (SP)
5623 PC: program counter (PC)
5625 ==> U-Boot will use R10 to hold a pointer to the global data
5627 NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5628 or current versions of GCC may "optimize" the code too much.
5633 U-Boot runs in system state and uses physical addresses, i.e. the
5634 MMU is not used either for address mapping nor for memory protection.
5636 The available memory is mapped to fixed addresses using the memory
5637 controller. In this process, a contiguous block is formed for each
5638 memory type (Flash, SDRAM, SRAM), even when it consists of several
5639 physical memory banks.
5641 U-Boot is installed in the first 128 kB of the first Flash bank (on
5642 TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5643 booting and sizing and initializing DRAM, the code relocates itself
5644 to the upper end of DRAM. Immediately below the U-Boot code some
5645 memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5646 configuration setting]. Below that, a structure with global Board
5647 Info data is placed, followed by the stack (growing downward).
5649 Additionally, some exception handler code is copied to the low 8 kB
5650 of DRAM (0x00000000 ... 0x00001FFF).
5652 So a typical memory configuration with 16 MB of DRAM could look like
5655 0x0000 0000 Exception Vector code
5658 0x0000 2000 Free for Application Use
5664 0x00FB FF20 Monitor Stack (Growing downward)
5665 0x00FB FFAC Board Info Data and permanent copy of global data
5666 0x00FC 0000 Malloc Arena
5669 0x00FE 0000 RAM Copy of Monitor Code
5670 ... eventually: LCD or video framebuffer
5671 ... eventually: pRAM (Protected RAM - unchanged by reset)
5672 0x00FF FFFF [End of RAM]
5675 System Initialization:
5676 ----------------------
5678 In the reset configuration, U-Boot starts at the reset entry point
5679 (on most PowerPC systems at address 0x00000100). Because of the reset
5680 configuration for CS0# this is a mirror of the onboard Flash memory.
5681 To be able to re-map memory U-Boot then jumps to its link address.
5682 To be able to implement the initialization code in C, a (small!)
5683 initial stack is set up in the internal Dual Ported RAM (in case CPUs
5684 which provide such a feature like MPC8xx or MPC8260), or in a locked
5685 part of the data cache. After that, U-Boot initializes the CPU core,
5686 the caches and the SIU.
5688 Next, all (potentially) available memory banks are mapped using a
5689 preliminary mapping. For example, we put them on 512 MB boundaries
5690 (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5691 on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5692 programmed for SDRAM access. Using the temporary configuration, a
5693 simple memory test is run that determines the size of the SDRAM
5696 When there is more than one SDRAM bank, and the banks are of
5697 different size, the largest is mapped first. For equal size, the first
5698 bank (CS2#) is mapped first. The first mapping is always for address
5699 0x00000000, with any additional banks following immediately to create
5700 contiguous memory starting from 0.
5702 Then, the monitor installs itself at the upper end of the SDRAM area
5703 and allocates memory for use by malloc() and for the global Board
5704 Info data; also, the exception vector code is copied to the low RAM
5705 pages, and the final stack is set up.
5707 Only after this relocation will you have a "normal" C environment;
5708 until that you are restricted in several ways, mostly because you are
5709 running from ROM, and because the code will have to be relocated to a
5713 U-Boot Porting Guide:
5714 ----------------------
5716 [Based on messages by Jerry Van Baren in the U-Boot-Users mailing
5720 int main(int argc, char *argv[])
5722 sighandler_t no_more_time;
5724 signal(SIGALRM, no_more_time);
5725 alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5727 if (available_money > available_manpower) {
5728 Pay consultant to port U-Boot;
5732 Download latest U-Boot source;
5734 Subscribe to u-boot mailing list;
5737 email("Hi, I am new to U-Boot, how do I get started?");
5740 Read the README file in the top level directory;
5741 Read http://www.denx.de/twiki/bin/view/DULG/Manual;
5742 Read applicable doc/*.README;
5743 Read the source, Luke;
5744 /* find . -name "*.[chS]" | xargs grep -i <keyword> */
5747 if (available_money > toLocalCurrency ($2500))
5750 Add a lot of aggravation and time;
5752 if (a similar board exists) { /* hopefully... */
5753 cp -a board/<similar> board/<myboard>
5754 cp include/configs/<similar>.h include/configs/<myboard>.h
5756 Create your own board support subdirectory;
5757 Create your own board include/configs/<myboard>.h file;
5759 Edit new board/<myboard> files
5760 Edit new include/configs/<myboard>.h
5765 Add / modify source code;
5769 email("Hi, I am having problems...");
5771 Send patch file to the U-Boot email list;
5772 if (reasonable critiques)
5773 Incorporate improvements from email list code review;
5775 Defend code as written;
5781 void no_more_time (int sig)
5790 All contributions to U-Boot should conform to the Linux kernel
5791 coding style; see the file "Documentation/CodingStyle" and the script
5792 "scripts/Lindent" in your Linux kernel source directory.
5794 Source files originating from a different project (for example the
5795 MTD subsystem) are generally exempt from these guidelines and are not
5796 reformated to ease subsequent migration to newer versions of those
5799 Please note that U-Boot is implemented in C (and to some small parts in
5800 Assembler); no C++ is used, so please do not use C++ style comments (//)
5803 Please also stick to the following formatting rules:
5804 - remove any trailing white space
5805 - use TAB characters for indentation and vertical alignment, not spaces
5806 - make sure NOT to use DOS '\r\n' line feeds
5807 - do not add more than 2 consecutive empty lines to source files
5808 - do not add trailing empty lines to source files
5810 Submissions which do not conform to the standards may be returned
5811 with a request to reformat the changes.
5817 Since the number of patches for U-Boot is growing, we need to
5818 establish some rules. Submissions which do not conform to these rules
5819 may be rejected, even when they contain important and valuable stuff.
5821 Please see http://www.denx.de/wiki/U-Boot/Patches for details.
5823 Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
5824 see http://lists.denx.de/mailman/listinfo/u-boot
5826 When you send a patch, please include the following information with
5829 * For bug fixes: a description of the bug and how your patch fixes
5830 this bug. Please try to include a way of demonstrating that the
5831 patch actually fixes something.
5833 * For new features: a description of the feature and your
5836 * A CHANGELOG entry as plaintext (separate from the patch)
5838 * For major contributions, your entry to the CREDITS file
5840 * When you add support for a new board, don't forget to add a
5841 maintainer e-mail address to the boards.cfg file, too.
5843 * If your patch adds new configuration options, don't forget to
5844 document these in the README file.
5846 * The patch itself. If you are using git (which is *strongly*
5847 recommended) you can easily generate the patch using the
5848 "git format-patch". If you then use "git send-email" to send it to
5849 the U-Boot mailing list, you will avoid most of the common problems
5850 with some other mail clients.
5852 If you cannot use git, use "diff -purN OLD NEW". If your version of
5853 diff does not support these options, then get the latest version of
5856 The current directory when running this command shall be the parent
5857 directory of the U-Boot source tree (i. e. please make sure that
5858 your patch includes sufficient directory information for the
5861 We prefer patches as plain text. MIME attachments are discouraged,
5862 and compressed attachments must not be used.
5864 * If one logical set of modifications affects or creates several
5865 files, all these changes shall be submitted in a SINGLE patch file.
5867 * Changesets that contain different, unrelated modifications shall be
5868 submitted as SEPARATE patches, one patch per changeset.
5873 * Before sending the patch, run the MAKEALL script on your patched
5874 source tree and make sure that no errors or warnings are reported
5875 for any of the boards.
5877 * Keep your modifications to the necessary minimum: A patch
5878 containing several unrelated changes or arbitrary reformats will be
5879 returned with a request to re-formatting / split it.
5881 * If you modify existing code, make sure that your new code does not
5882 add to the memory footprint of the code ;-) Small is beautiful!
5883 When adding new features, these should compile conditionally only
5884 (using #ifdef), and the resulting code with the new feature
5885 disabled must not need more memory than the old code without your
5888 * Remember that there is a size limit of 100 kB per message on the
5889 u-boot mailing list. Bigger patches will be moderated. If they are
5890 reasonable and not too big, they will be acknowledged. But patches
5891 bigger than the size limit should be avoided.
projects / kernel / u-boot.git / blob