2 # (C) Copyright 2000 - 2011
3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 # See file CREDITS for list of people who contributed to this
8 # This program is free software; you can redistribute it and/or
9 # modify it under the terms of the GNU General Public License as
10 # published by the Free Software Foundation; either version 2 of
11 # the License, or (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write to the Free Software
20 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 This directory contains the source code for U-Boot, a boot loader for
28 Embedded boards based on PowerPC, ARM, MIPS and several other
29 processors, which can be installed in a boot ROM and used to
30 initialize and test the hardware or to download and run application
33 The development of U-Boot is closely related to Linux: some parts of
34 the source code originate in the Linux source tree, we have some
35 header files in common, and special provision has been made to
36 support booting of Linux images.
38 Some attention has been paid to make this software easily
39 configurable and extendable. For instance, all monitor commands are
40 implemented with the same call interface, so that it's very easy to
41 add new commands. Also, instead of permanently adding rarely used
42 code (for instance hardware test utilities) to the monitor, you can
43 load and run it dynamically.
49 In general, all boards for which a configuration option exists in the
50 Makefile have been tested to some extent and can be considered
51 "working". In fact, many of them are used in production systems.
53 In case of problems see the CHANGELOG and CREDITS files to find out
54 who contributed the specific port. The MAINTAINERS file lists board
61 In case you have questions about, problems with or contributions for
62 U-Boot you should send a message to the U-Boot mailing list at
63 <u-boot@lists.denx.de>. There is also an archive of previous traffic
64 on the mailing list - please search the archive before asking FAQ's.
65 Please see http://lists.denx.de/pipermail/u-boot and
66 http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
69 Where to get source code:
70 =========================
72 The U-Boot source code is maintained in the git repository at
73 git://www.denx.de/git/u-boot.git ; you can browse it online at
74 http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
76 The "snapshot" links on this page allow you to download tarballs of
77 any version you might be interested in. Official releases are also
78 available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
81 Pre-built (and tested) images are available from
82 ftp://ftp.denx.de/pub/u-boot/images/
88 - start from 8xxrom sources
89 - create PPCBoot project (http://sourceforge.net/projects/ppcboot)
91 - make it easier to add custom boards
92 - make it possible to add other [PowerPC] CPUs
93 - extend functions, especially:
94 * Provide extended interface to Linux boot loader
97 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
98 - create ARMBoot project (http://sourceforge.net/projects/armboot)
99 - add other CPU families (starting with ARM)
100 - create U-Boot project (http://sourceforge.net/projects/u-boot)
101 - current project page: see http://www.denx.de/wiki/U-Boot
107 The "official" name of this project is "Das U-Boot". The spelling
108 "U-Boot" shall be used in all written text (documentation, comments
109 in source files etc.). Example:
111 This is the README file for the U-Boot project.
113 File names etc. shall be based on the string "u-boot". Examples:
115 include/asm-ppc/u-boot.h
117 #include <asm/u-boot.h>
119 Variable names, preprocessor constants etc. shall be either based on
120 the string "u_boot" or on "U_BOOT". Example:
122 U_BOOT_VERSION u_boot_logo
123 IH_OS_U_BOOT u_boot_hush_start
129 Starting with the release in October 2008, the names of the releases
130 were changed from numerical release numbers without deeper meaning
131 into a time stamp based numbering. Regular releases are identified by
132 names consisting of the calendar year and month of the release date.
133 Additional fields (if present) indicate release candidates or bug fix
134 releases in "stable" maintenance trees.
137 U-Boot v2009.11 - Release November 2009
138 U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
139 U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
145 /arch Architecture specific files
146 /arm Files generic to ARM architecture
147 /cpu CPU specific files
148 /arm720t Files specific to ARM 720 CPUs
149 /arm920t Files specific to ARM 920 CPUs
150 /at91 Files specific to Atmel AT91RM9200 CPU
151 /imx Files specific to Freescale MC9328 i.MX CPUs
152 /s3c24x0 Files specific to Samsung S3C24X0 CPUs
153 /arm925t Files specific to ARM 925 CPUs
154 /arm926ejs Files specific to ARM 926 CPUs
155 /arm1136 Files specific to ARM 1136 CPUs
156 /ixp Files specific to Intel XScale IXP CPUs
157 /pxa Files specific to Intel XScale PXA CPUs
158 /s3c44b0 Files specific to Samsung S3C44B0 CPUs
159 /sa1100 Files specific to Intel StrongARM SA1100 CPUs
160 /lib Architecture specific library files
161 /avr32 Files generic to AVR32 architecture
162 /cpu CPU specific files
163 /lib Architecture specific library files
164 /blackfin Files generic to Analog Devices Blackfin architecture
165 /cpu CPU specific files
166 /lib Architecture specific library files
167 /x86 Files generic to x86 architecture
168 /cpu CPU specific files
169 /lib Architecture specific library files
170 /m68k Files generic to m68k architecture
171 /cpu CPU specific files
172 /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
173 /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
174 /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
175 /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
176 /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
177 /lib Architecture specific library files
178 /microblaze Files generic to microblaze architecture
179 /cpu CPU specific files
180 /lib Architecture specific library files
181 /mips Files generic to MIPS architecture
182 /cpu CPU specific files
183 /mips32 Files specific to MIPS32 CPUs
184 /lib Architecture specific library files
185 /nios2 Files generic to Altera NIOS2 architecture
186 /cpu CPU specific files
187 /lib Architecture specific library files
188 /powerpc Files generic to PowerPC architecture
189 /cpu CPU specific files
190 /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
191 /mpc5xx Files specific to Freescale MPC5xx CPUs
192 /mpc5xxx Files specific to Freescale MPC5xxx CPUs
193 /mpc8xx Files specific to Freescale MPC8xx CPUs
194 /mpc8220 Files specific to Freescale MPC8220 CPUs
195 /mpc824x Files specific to Freescale MPC824x CPUs
196 /mpc8260 Files specific to Freescale MPC8260 CPUs
197 /mpc85xx Files specific to Freescale MPC85xx CPUs
198 /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
199 /lib Architecture specific library files
200 /sh Files generic to SH architecture
201 /cpu CPU specific files
202 /sh2 Files specific to sh2 CPUs
203 /sh3 Files specific to sh3 CPUs
204 /sh4 Files specific to sh4 CPUs
205 /lib Architecture specific library files
206 /sparc Files generic to SPARC architecture
207 /cpu CPU specific files
208 /leon2 Files specific to Gaisler LEON2 SPARC CPU
209 /leon3 Files specific to Gaisler LEON3 SPARC CPU
210 /lib Architecture specific library files
211 /api Machine/arch independent API for external apps
212 /board Board dependent files
213 /common Misc architecture independent functions
214 /disk Code for disk drive partition handling
215 /doc Documentation (don't expect too much)
216 /drivers Commonly used device drivers
217 /examples Example code for standalone applications, etc.
218 /fs Filesystem code (cramfs, ext2, jffs2, etc.)
219 /include Header Files
220 /lib Files generic to all architectures
221 /libfdt Library files to support flattened device trees
222 /lzma Library files to support LZMA decompression
223 /lzo Library files to support LZO decompression
225 /post Power On Self Test
226 /rtc Real Time Clock drivers
227 /tools Tools to build S-Record or U-Boot images, etc.
229 Software Configuration:
230 =======================
232 Configuration is usually done using C preprocessor defines; the
233 rationale behind that is to avoid dead code whenever possible.
235 There are two classes of configuration variables:
237 * Configuration _OPTIONS_:
238 These are selectable by the user and have names beginning with
241 * Configuration _SETTINGS_:
242 These depend on the hardware etc. and should not be meddled with if
243 you don't know what you're doing; they have names beginning with
246 Later we will add a configuration tool - probably similar to or even
247 identical to what's used for the Linux kernel. Right now, we have to
248 do the configuration by hand, which means creating some symbolic
249 links and editing some configuration files. We use the TQM8xxL boards
253 Selection of Processor Architecture and Board Type:
254 ---------------------------------------------------
256 For all supported boards there are ready-to-use default
257 configurations available; just type "make <board_name>_config".
259 Example: For a TQM823L module type:
264 For the Cogent platform, you need to specify the CPU type as well;
265 e.g. "make cogent_mpc8xx_config". And also configure the cogent
266 directory according to the instructions in cogent/README.
269 Configuration Options:
270 ----------------------
272 Configuration depends on the combination of board and CPU type; all
273 such information is kept in a configuration file
274 "include/configs/<board_name>.h".
276 Example: For a TQM823L module, all configuration settings are in
277 "include/configs/TQM823L.h".
280 Many of the options are named exactly as the corresponding Linux
281 kernel configuration options. The intention is to make it easier to
282 build a config tool - later.
285 The following options need to be configured:
287 - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
289 - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
291 - CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
292 Define exactly one, e.g. CONFIG_ATSTK1002
294 - CPU Module Type: (if CONFIG_COGENT is defined)
295 Define exactly one of
297 --- FIXME --- not tested yet:
298 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
299 CONFIG_CMA287_23, CONFIG_CMA287_50
301 - Motherboard Type: (if CONFIG_COGENT is defined)
302 Define exactly one of
303 CONFIG_CMA101, CONFIG_CMA102
305 - Motherboard I/O Modules: (if CONFIG_COGENT is defined)
306 Define one or more of
309 - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
310 Define one or more of
311 CONFIG_LCD_HEARTBEAT - update a character position on
312 the LCD display every second with
315 - Board flavour: (if CONFIG_MPC8260ADS is defined)
318 CONFIG_SYS_8260ADS - original MPC8260ADS
319 CONFIG_SYS_8266ADS - MPC8266ADS
320 CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
321 CONFIG_SYS_8272ADS - MPC8272ADS
323 - Marvell Family Member
324 CONFIG_SYS_MVFS - define it if you want to enable
325 multiple fs option at one time
326 for marvell soc family
328 - MPC824X Family Member (if CONFIG_MPC824X is defined)
329 Define exactly one of
330 CONFIG_MPC8240, CONFIG_MPC8245
332 - 8xx CPU Options: (if using an MPC8xx CPU)
333 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
334 get_gclk_freq() cannot work
335 e.g. if there is no 32KHz
336 reference PIT/RTC clock
337 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
340 - 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
341 CONFIG_SYS_8xx_CPUCLK_MIN
342 CONFIG_SYS_8xx_CPUCLK_MAX
343 CONFIG_8xx_CPUCLK_DEFAULT
344 See doc/README.MPC866
346 CONFIG_SYS_MEASURE_CPUCLK
348 Define this to measure the actual CPU clock instead
349 of relying on the correctness of the configured
350 values. Mostly useful for board bringup to make sure
351 the PLL is locked at the intended frequency. Note
352 that this requires a (stable) reference clock (32 kHz
353 RTC clock or CONFIG_SYS_8XX_XIN)
355 CONFIG_SYS_DELAYED_ICACHE
357 Define this option if you want to enable the
358 ICache only when Code runs from RAM.
361 CONFIG_SYS_FSL_TBCLK_DIV
363 Defines the core time base clock divider ratio compared to the
364 system clock. On most PQ3 devices this is 8, on newer QorIQ
365 devices it can be 16 or 32. The ratio varies from SoC to Soc.
367 CONFIG_SYS_FSL_PCIE_COMPAT
369 Defines the string to utilize when trying to match PCIe device
370 tree nodes for the given platform.
372 - Intel Monahans options:
373 CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
375 Defines the Monahans run mode to oscillator
376 ratio. Valid values are 8, 16, 24, 31. The core
377 frequency is this value multiplied by 13 MHz.
379 CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
381 Defines the Monahans turbo mode to oscillator
382 ratio. Valid values are 1 (default if undefined) and
383 2. The core frequency as calculated above is multiplied
387 CONFIG_SYS_INIT_SP_OFFSET
389 Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
390 pointer. This is needed for the temporary stack before
393 CONFIG_SYS_MIPS_CACHE_MODE
395 Cache operation mode for the MIPS CPU.
396 See also arch/mips/include/asm/mipsregs.h.
398 CONF_CM_CACHABLE_NO_WA
401 CONF_CM_CACHABLE_NONCOHERENT
405 CONF_CM_CACHABLE_ACCELERATED
407 CONFIG_SYS_XWAY_EBU_BOOTCFG
409 Special option for Lantiq XWAY SoCs for booting from NOR flash.
410 See also arch/mips/cpu/mips32/start.S.
412 CONFIG_XWAY_SWAP_BYTES
414 Enable compilation of tools/xway-swap-bytes needed for Lantiq
415 XWAY SoCs for booting from NOR flash. The U-Boot image needs to
416 be swapped if a flash programmer is used.
418 - Linux Kernel Interface:
421 U-Boot stores all clock information in Hz
422 internally. For binary compatibility with older Linux
423 kernels (which expect the clocks passed in the
424 bd_info data to be in MHz) the environment variable
425 "clocks_in_mhz" can be defined so that U-Boot
426 converts clock data to MHZ before passing it to the
428 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
429 "clocks_in_mhz=1" is automatically included in the
432 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
434 When transferring memsize parameter to linux, some versions
435 expect it to be in bytes, others in MB.
436 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
440 New kernel versions are expecting firmware settings to be
441 passed using flattened device trees (based on open firmware
445 * New libfdt-based support
446 * Adds the "fdt" command
447 * The bootm command automatically updates the fdt
449 OF_CPU - The proper name of the cpus node (only required for
450 MPC512X and MPC5xxx based boards).
451 OF_SOC - The proper name of the soc node (only required for
452 MPC512X and MPC5xxx based boards).
453 OF_TBCLK - The timebase frequency.
454 OF_STDOUT_PATH - The path to the console device
456 boards with QUICC Engines require OF_QE to set UCC MAC
459 CONFIG_OF_BOARD_SETUP
461 Board code has addition modification that it wants to make
462 to the flat device tree before handing it off to the kernel
466 This define fills in the correct boot CPU in the boot
467 param header, the default value is zero if undefined.
471 U-Boot can detect if an IDE device is present or not.
472 If not, and this new config option is activated, U-Boot
473 removes the ATA node from the DTS before booting Linux,
474 so the Linux IDE driver does not probe the device and
475 crash. This is needed for buggy hardware (uc101) where
476 no pull down resistor is connected to the signal IDE5V_DD7.
478 CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
480 This setting is mandatory for all boards that have only one
481 machine type and must be used to specify the machine type
482 number as it appears in the ARM machine registry
483 (see http://www.arm.linux.org.uk/developer/machines/).
484 Only boards that have multiple machine types supported
485 in a single configuration file and the machine type is
486 runtime discoverable, do not have to use this setting.
488 - vxWorks boot parameters:
490 bootvx constructs a valid bootline using the following
491 environments variables: bootfile, ipaddr, serverip, hostname.
492 It loads the vxWorks image pointed bootfile.
494 CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
495 CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
496 CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
497 CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
499 CONFIG_SYS_VXWORKS_ADD_PARAMS
501 Add it at the end of the bootline. E.g "u=username pw=secret"
503 Note: If a "bootargs" environment is defined, it will overwride
504 the defaults discussed just above.
506 - Cache Configuration:
507 CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
508 CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
509 CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
511 - Cache Configuration for ARM:
512 CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
514 CONFIG_SYS_PL310_BASE - Physical base address of PL310
515 controller register space
520 Define this if you want support for Amba PrimeCell PL010 UARTs.
524 Define this if you want support for Amba PrimeCell PL011 UARTs.
528 If you have Amba PrimeCell PL011 UARTs, set this variable to
529 the clock speed of the UARTs.
533 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
534 define this to a list of base addresses for each (supported)
535 port. See e.g. include/configs/versatile.h
537 CONFIG_PL011_SERIAL_RLCR
539 Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
540 have separate receive and transmit line control registers. Set
541 this variable to initialize the extra register.
543 CONFIG_PL011_SERIAL_FLUSH_ON_INIT
545 On some platforms (e.g. U8500) U-Boot is loaded by a second stage
546 boot loader that has already initialized the UART. Define this
547 variable to flush the UART at init time.
551 Depending on board, define exactly one serial port
552 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
553 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
554 console by defining CONFIG_8xx_CONS_NONE
556 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
557 port routines must be defined elsewhere
558 (i.e. serial_init(), serial_getc(), ...)
561 Enables console device for a color framebuffer. Needs following
562 defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
563 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
565 VIDEO_HW_RECTFILL graphic chip supports
568 VIDEO_HW_BITBLT graphic chip supports
569 bit-blit (cf. smiLynxEM)
570 VIDEO_VISIBLE_COLS visible pixel columns
572 VIDEO_VISIBLE_ROWS visible pixel rows
573 VIDEO_PIXEL_SIZE bytes per pixel
574 VIDEO_DATA_FORMAT graphic data format
575 (0-5, cf. cfb_console.c)
576 VIDEO_FB_ADRS framebuffer address
577 VIDEO_KBD_INIT_FCT keyboard int fct
578 (i.e. i8042_kbd_init())
579 VIDEO_TSTC_FCT test char fct
581 VIDEO_GETC_FCT get char fct
583 CONFIG_CONSOLE_CURSOR cursor drawing on/off
584 (requires blink timer
586 CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
587 CONFIG_CONSOLE_TIME display time/date info in
589 (requires CONFIG_CMD_DATE)
590 CONFIG_VIDEO_LOGO display Linux logo in
592 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
593 linux_logo.h for logo.
594 Requires CONFIG_VIDEO_LOGO
595 CONFIG_CONSOLE_EXTRA_INFO
596 additional board info beside
599 When CONFIG_CFB_CONSOLE is defined, video console is
600 default i/o. Serial console can be forced with
601 environment 'console=serial'.
603 When CONFIG_SILENT_CONSOLE is defined, all console
604 messages (by U-Boot and Linux!) can be silenced with
605 the "silent" environment variable. See
606 doc/README.silent for more information.
609 CONFIG_BAUDRATE - in bps
610 Select one of the baudrates listed in
611 CONFIG_SYS_BAUDRATE_TABLE, see below.
612 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
614 - Console Rx buffer length
615 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
616 the maximum receive buffer length for the SMC.
617 This option is actual only for 82xx and 8xx possible.
618 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
619 must be defined, to setup the maximum idle timeout for
622 - Pre-Console Buffer:
623 Prior to the console being initialised (i.e. serial UART
624 initialised etc) all console output is silently discarded.
625 Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
626 buffer any console messages prior to the console being
627 initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
628 bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
629 a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
630 bytes are output before the console is initialised, the
631 earlier bytes are discarded.
633 'Sane' compilers will generate smaller code if
634 CONFIG_PRE_CON_BUF_SZ is a power of 2
636 - Boot Delay: CONFIG_BOOTDELAY - in seconds
637 Delay before automatically booting the default image;
638 set to -1 to disable autoboot.
640 See doc/README.autoboot for these options that
641 work with CONFIG_BOOTDELAY. None are required.
642 CONFIG_BOOT_RETRY_TIME
643 CONFIG_BOOT_RETRY_MIN
644 CONFIG_AUTOBOOT_KEYED
645 CONFIG_AUTOBOOT_PROMPT
646 CONFIG_AUTOBOOT_DELAY_STR
647 CONFIG_AUTOBOOT_STOP_STR
648 CONFIG_AUTOBOOT_DELAY_STR2
649 CONFIG_AUTOBOOT_STOP_STR2
650 CONFIG_ZERO_BOOTDELAY_CHECK
651 CONFIG_RESET_TO_RETRY
655 Only needed when CONFIG_BOOTDELAY is enabled;
656 define a command string that is automatically executed
657 when no character is read on the console interface
658 within "Boot Delay" after reset.
661 This can be used to pass arguments to the bootm
662 command. The value of CONFIG_BOOTARGS goes into the
663 environment value "bootargs".
665 CONFIG_RAMBOOT and CONFIG_NFSBOOT
666 The value of these goes into the environment as
667 "ramboot" and "nfsboot" respectively, and can be used
668 as a convenience, when switching between booting from
674 When this option is #defined, the existence of the
675 environment variable "preboot" will be checked
676 immediately before starting the CONFIG_BOOTDELAY
677 countdown and/or running the auto-boot command resp.
678 entering interactive mode.
680 This feature is especially useful when "preboot" is
681 automatically generated or modified. For an example
682 see the LWMON board specific code: here "preboot" is
683 modified when the user holds down a certain
684 combination of keys on the (special) keyboard when
687 - Serial Download Echo Mode:
689 If defined to 1, all characters received during a
690 serial download (using the "loads" command) are
691 echoed back. This might be needed by some terminal
692 emulations (like "cu"), but may as well just take
693 time on others. This setting #define's the initial
694 value of the "loads_echo" environment variable.
696 - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
698 Select one of the baudrates listed in
699 CONFIG_SYS_BAUDRATE_TABLE, see below.
702 Monitor commands can be included or excluded
703 from the build by using the #include files
704 "config_cmd_all.h" and #undef'ing unwanted
705 commands, or using "config_cmd_default.h"
706 and augmenting with additional #define's
709 The default command configuration includes all commands
710 except those marked below with a "*".
712 CONFIG_CMD_ASKENV * ask for env variable
713 CONFIG_CMD_BDI bdinfo
714 CONFIG_CMD_BEDBUG * Include BedBug Debugger
715 CONFIG_CMD_BMP * BMP support
716 CONFIG_CMD_BSP * Board specific commands
717 CONFIG_CMD_BOOTD bootd
718 CONFIG_CMD_CACHE * icache, dcache
719 CONFIG_CMD_CONSOLE coninfo
720 CONFIG_CMD_CRC32 * crc32
721 CONFIG_CMD_DATE * support for RTC, date/time...
722 CONFIG_CMD_DHCP * DHCP support
723 CONFIG_CMD_DIAG * Diagnostics
724 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
725 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
726 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
727 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
728 CONFIG_CMD_DTT * Digital Therm and Thermostat
729 CONFIG_CMD_ECHO echo arguments
730 CONFIG_CMD_EDITENV edit env variable
731 CONFIG_CMD_EEPROM * EEPROM read/write support
732 CONFIG_CMD_ELF * bootelf, bootvx
733 CONFIG_CMD_EXPORTENV * export the environment
734 CONFIG_CMD_SAVEENV saveenv
735 CONFIG_CMD_FDC * Floppy Disk Support
736 CONFIG_CMD_FAT * FAT partition support
737 CONFIG_CMD_FDOS * Dos diskette Support
738 CONFIG_CMD_FLASH flinfo, erase, protect
739 CONFIG_CMD_FPGA FPGA device initialization support
740 CONFIG_CMD_GO * the 'go' command (exec code)
741 CONFIG_CMD_GREPENV * search environment
742 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
743 CONFIG_CMD_I2C * I2C serial bus support
744 CONFIG_CMD_IDE * IDE harddisk support
745 CONFIG_CMD_IMI iminfo
746 CONFIG_CMD_IMLS List all found images
747 CONFIG_CMD_IMMAP * IMMR dump support
748 CONFIG_CMD_IMPORTENV * import an environment
749 CONFIG_CMD_IRQ * irqinfo
750 CONFIG_CMD_ITEST Integer/string test of 2 values
751 CONFIG_CMD_JFFS2 * JFFS2 Support
752 CONFIG_CMD_KGDB * kgdb
753 CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader)
754 CONFIG_CMD_LOADB loadb
755 CONFIG_CMD_LOADS loads
756 CONFIG_CMD_MD5SUM print md5 message digest
757 (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
758 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
760 CONFIG_CMD_MISC Misc functions like sleep etc
761 CONFIG_CMD_MMC * MMC memory mapped support
762 CONFIG_CMD_MII * MII utility commands
763 CONFIG_CMD_MTDPARTS * MTD partition support
764 CONFIG_CMD_NAND * NAND support
765 CONFIG_CMD_NET bootp, tftpboot, rarpboot
766 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
767 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
768 CONFIG_CMD_PCI * pciinfo
769 CONFIG_CMD_PCMCIA * PCMCIA support
770 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
772 CONFIG_CMD_PORTIO * Port I/O
773 CONFIG_CMD_REGINFO * Register dump
774 CONFIG_CMD_RUN run command in env variable
775 CONFIG_CMD_SAVES * save S record dump
776 CONFIG_CMD_SCSI * SCSI Support
777 CONFIG_CMD_SDRAM * print SDRAM configuration information
778 (requires CONFIG_CMD_I2C)
779 CONFIG_CMD_SETGETDCR Support for DCR Register access
781 CONFIG_CMD_SHA1SUM print sha1 memory digest
782 (requires CONFIG_CMD_MEMORY)
783 CONFIG_CMD_SOURCE "source" command Support
784 CONFIG_CMD_SPI * SPI serial bus support
785 CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
786 CONFIG_CMD_USB * USB support
787 CONFIG_CMD_CDP * Cisco Discover Protocol support
788 CONFIG_CMD_FSL * Microblaze FSL support
791 EXAMPLE: If you want all functions except of network
792 support you can write:
794 #include "config_cmd_all.h"
795 #undef CONFIG_CMD_NET
798 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
800 Note: Don't enable the "icache" and "dcache" commands
801 (configuration option CONFIG_CMD_CACHE) unless you know
802 what you (and your U-Boot users) are doing. Data
803 cache cannot be enabled on systems like the 8xx or
804 8260 (where accesses to the IMMR region must be
805 uncached), and it cannot be disabled on all other
806 systems where we (mis-) use the data cache to hold an
807 initial stack and some data.
810 XXX - this list needs to get updated!
814 If this variable is defined, it enables watchdog
815 support for the SoC. There must be support in the SoC
816 specific code for a watchdog. For the 8xx and 8260
817 CPUs, the SIU Watchdog feature is enabled in the SYPCR
818 register. When supported for a specific SoC is
819 available, then no further board specific code should
823 When using a watchdog circuitry external to the used
824 SoC, then define this variable and provide board
825 specific code for the "hw_watchdog_reset" function.
828 CONFIG_VERSION_VARIABLE
829 If this variable is defined, an environment variable
830 named "ver" is created by U-Boot showing the U-Boot
831 version as printed by the "version" command.
832 This variable is readonly.
836 When CONFIG_CMD_DATE is selected, the type of the RTC
837 has to be selected, too. Define exactly one of the
840 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
841 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
842 CONFIG_RTC_MC13783 - use MC13783 RTC
843 CONFIG_RTC_MC146818 - use MC146818 RTC
844 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
845 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
846 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
847 CONFIG_RTC_DS164x - use Dallas DS164x RTC
848 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
849 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
850 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
851 CONFIG_SYS_RV3029_TCR - enable trickle charger on
854 Note that if the RTC uses I2C, then the I2C interface
855 must also be configured. See I2C Support, below.
858 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
859 CONFIG_PCA953X_INFO - enable pca953x info command
861 The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
862 chip-ngpio pairs that tell the PCA953X driver the number of
863 pins supported by a particular chip.
865 Note that if the GPIO device uses I2C, then the I2C interface
866 must also be configured. See I2C Support, below.
870 When CONFIG_TIMESTAMP is selected, the timestamp
871 (date and time) of an image is printed by image
872 commands like bootm or iminfo. This option is
873 automatically enabled when you select CONFIG_CMD_DATE .
876 CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
877 and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
879 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
880 CONFIG_CMD_SCSI) you must configure support for at
881 least one partition type as well.
884 CONFIG_IDE_RESET_ROUTINE - this is defined in several
885 board configurations files but used nowhere!
887 CONFIG_IDE_RESET - is this is defined, IDE Reset will
888 be performed by calling the function
889 ide_set_reset(int reset)
890 which has to be defined in a board specific file
895 Set this to enable ATAPI support.
900 Set this to enable support for disks larger than 137GB
901 Also look at CONFIG_SYS_64BIT_LBA.
902 Whithout these , LBA48 support uses 32bit variables and will 'only'
903 support disks up to 2.1TB.
905 CONFIG_SYS_64BIT_LBA:
906 When enabled, makes the IDE subsystem use 64bit sector addresses.
910 At the moment only there is only support for the
911 SYM53C8XX SCSI controller; define
912 CONFIG_SCSI_SYM53C8XX to enable it.
914 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
915 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
916 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
917 maximum numbers of LUNs, SCSI ID's and target
919 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
921 - NETWORK Support (PCI):
923 Support for Intel 8254x gigabit chips.
925 CONFIG_E1000_FALLBACK_MAC
926 default MAC for empty EEPROM after production.
929 Support for Intel 82557/82559/82559ER chips.
930 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
931 write routine for first time initialisation.
934 Support for Digital 2114x chips.
935 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
936 modem chip initialisation (KS8761/QS6611).
939 Support for National dp83815 chips.
942 Support for National dp8382[01] gigabit chips.
944 - NETWORK Support (other):
946 CONFIG_DRIVER_AT91EMAC
947 Support for AT91RM9200 EMAC.
950 Define this to use reduced MII inteface
952 CONFIG_DRIVER_AT91EMAC_QUIET
953 If this defined, the driver is quiet.
954 The driver doen't show link status messages.
956 CONFIG_DRIVER_LAN91C96
957 Support for SMSC's LAN91C96 chips.
960 Define this to hold the physical address
961 of the LAN91C96's I/O space
963 CONFIG_LAN91C96_USE_32_BIT
964 Define this to enable 32 bit addressing
966 CONFIG_DRIVER_SMC91111
967 Support for SMSC's LAN91C111 chip
970 Define this to hold the physical address
971 of the device (I/O space)
973 CONFIG_SMC_USE_32_BIT
974 Define this if data bus is 32 bits
976 CONFIG_SMC_USE_IOFUNCS
977 Define this to use i/o functions instead of macros
978 (some hardware wont work with macros)
981 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
983 CONFIG_FTGMAC100_EGIGA
984 Define this to use GE link update with gigabit PHY.
985 Define this if FTGMAC100 is connected to gigabit PHY.
986 If your system has 10/100 PHY only, it might not occur
987 wrong behavior. Because PHY usually return timeout or
988 useless data when polling gigabit status and gigabit
989 control registers. This behavior won't affect the
990 correctnessof 10/100 link speed update.
993 Support for SMSC's LAN911x and LAN921x chips
996 Define this to hold the physical address
997 of the device (I/O space)
999 CONFIG_SMC911X_32_BIT
1000 Define this if data bus is 32 bits
1002 CONFIG_SMC911X_16_BIT
1003 Define this if data bus is 16 bits. If your processor
1004 automatically converts one 32 bit word to two 16 bit
1005 words you may also try CONFIG_SMC911X_32_BIT.
1008 Support for Renesas on-chip Ethernet controller
1010 CONFIG_SH_ETHER_USE_PORT
1011 Define the number of ports to be used
1013 CONFIG_SH_ETHER_PHY_ADDR
1014 Define the ETH PHY's address
1016 CONFIG_SH_ETHER_CACHE_WRITEBACK
1017 If this option is set, the driver enables cache flush.
1020 At the moment only the UHCI host controller is
1021 supported (PIP405, MIP405, MPC5200); define
1022 CONFIG_USB_UHCI to enable it.
1023 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
1024 and define CONFIG_USB_STORAGE to enable the USB
1027 Supported are USB Keyboards and USB Floppy drives
1029 MPC5200 USB requires additional defines:
1031 for 528 MHz Clock: 0x0001bbbb
1035 for differential drivers: 0x00001000
1036 for single ended drivers: 0x00005000
1037 for differential drivers on PSC3: 0x00000100
1038 for single ended drivers on PSC3: 0x00004100
1039 CONFIG_SYS_USB_EVENT_POLL
1040 May be defined to allow interrupt polling
1041 instead of using asynchronous interrupts
1044 Define the below if you wish to use the USB console.
1045 Once firmware is rebuilt from a serial console issue the
1046 command "setenv stdin usbtty; setenv stdout usbtty" and
1047 attach your USB cable. The Unix command "dmesg" should print
1048 it has found a new device. The environment variable usbtty
1049 can be set to gserial or cdc_acm to enable your device to
1050 appear to a USB host as a Linux gserial device or a
1051 Common Device Class Abstract Control Model serial device.
1052 If you select usbtty = gserial you should be able to enumerate
1054 # modprobe usbserial vendor=0xVendorID product=0xProductID
1055 else if using cdc_acm, simply setting the environment
1056 variable usbtty to be cdc_acm should suffice. The following
1057 might be defined in YourBoardName.h
1060 Define this to build a UDC device
1063 Define this to have a tty type of device available to
1064 talk to the UDC device
1066 CONFIG_SYS_CONSOLE_IS_IN_ENV
1067 Define this if you want stdin, stdout &/or stderr to
1071 CONFIG_SYS_USB_EXTC_CLK 0xBLAH
1072 Derive USB clock from external clock "blah"
1073 - CONFIG_SYS_USB_EXTC_CLK 0x02
1075 CONFIG_SYS_USB_BRG_CLK 0xBLAH
1076 Derive USB clock from brgclk
1077 - CONFIG_SYS_USB_BRG_CLK 0x04
1079 If you have a USB-IF assigned VendorID then you may wish to
1080 define your own vendor specific values either in BoardName.h
1081 or directly in usbd_vendor_info.h. If you don't define
1082 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
1083 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
1084 should pretend to be a Linux device to it's target host.
1086 CONFIG_USBD_MANUFACTURER
1087 Define this string as the name of your company for
1088 - CONFIG_USBD_MANUFACTURER "my company"
1090 CONFIG_USBD_PRODUCT_NAME
1091 Define this string as the name of your product
1092 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
1094 CONFIG_USBD_VENDORID
1095 Define this as your assigned Vendor ID from the USB
1096 Implementors Forum. This *must* be a genuine Vendor ID
1097 to avoid polluting the USB namespace.
1098 - CONFIG_USBD_VENDORID 0xFFFF
1100 CONFIG_USBD_PRODUCTID
1101 Define this as the unique Product ID
1103 - CONFIG_USBD_PRODUCTID 0xFFFF
1107 The MMC controller on the Intel PXA is supported. To
1108 enable this define CONFIG_MMC. The MMC can be
1109 accessed from the boot prompt by mapping the device
1110 to physical memory similar to flash. Command line is
1111 enabled with CONFIG_CMD_MMC. The MMC driver also works with
1112 the FAT fs. This is enabled with CONFIG_CMD_FAT.
1115 Support for Renesas on-chip MMCIF controller
1117 CONFIG_SH_MMCIF_ADDR
1118 Define the base address of MMCIF registers
1121 Define the clock frequency for MMCIF
1123 - Journaling Flash filesystem support:
1124 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
1125 CONFIG_JFFS2_NAND_DEV
1126 Define these for a default partition on a NAND device
1128 CONFIG_SYS_JFFS2_FIRST_SECTOR,
1129 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
1130 Define these for a default partition on a NOR device
1132 CONFIG_SYS_JFFS_CUSTOM_PART
1133 Define this to create an own partition. You have to provide a
1134 function struct part_info* jffs2_part_info(int part_num)
1136 If you define only one JFFS2 partition you may also want to
1137 #define CONFIG_SYS_JFFS_SINGLE_PART 1
1138 to disable the command chpart. This is the default when you
1139 have not defined a custom partition
1144 Define this to enable standard (PC-Style) keyboard
1148 Standard PC keyboard driver with US (is default) and
1149 GERMAN key layout (switch via environment 'keymap=de') support.
1150 Export function i8042_kbd_init, i8042_tstc and i8042_getc
1151 for cfb_console. Supports cursor blinking.
1156 Define this to enable video support (for output to
1159 CONFIG_VIDEO_CT69000
1161 Enable Chips & Technologies 69000 Video chip
1163 CONFIG_VIDEO_SMI_LYNXEM
1164 Enable Silicon Motion SMI 712/710/810 Video chip. The
1165 video output is selected via environment 'videoout'
1166 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1169 For the CT69000 and SMI_LYNXEM drivers, videomode is
1170 selected via environment 'videomode'. Two different ways
1172 - "videomode=num" 'num' is a standard LiLo mode numbers.
1173 Following standard modes are supported (* is default):
1175 Colors 640x480 800x600 1024x768 1152x864 1280x1024
1176 -------------+---------------------------------------------
1177 8 bits | 0x301* 0x303 0x305 0x161 0x307
1178 15 bits | 0x310 0x313 0x316 0x162 0x319
1179 16 bits | 0x311 0x314 0x317 0x163 0x31A
1180 24 bits | 0x312 0x315 0x318 ? 0x31B
1181 -------------+---------------------------------------------
1182 (i.e. setenv videomode 317; saveenv; reset;)
1184 - "videomode=bootargs" all the video parameters are parsed
1185 from the bootargs. (See drivers/video/videomodes.c)
1188 CONFIG_VIDEO_SED13806
1189 Enable Epson SED13806 driver. This driver supports 8bpp
1190 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1191 or CONFIG_VIDEO_SED13806_16BPP
1194 Enable the Freescale DIU video driver. Reference boards for
1195 SOCs that have a DIU should define this macro to enable DIU
1196 support, and should also define these other macros:
1202 CONFIG_VIDEO_SW_CURSOR
1203 CONFIG_VGA_AS_SINGLE_DEVICE
1205 CONFIG_VIDEO_BMP_LOGO
1207 The DIU driver will look for the 'video-mode' environment
1208 variable, and if defined, enable the DIU as a console during
1209 boot. See the documentation file README.video for a
1210 description of this variable.
1215 Define this to enable a custom keyboard support.
1216 This simply calls drv_keyboard_init() which must be
1217 defined in your board-specific files.
1218 The only board using this so far is RBC823.
1220 - LCD Support: CONFIG_LCD
1222 Define this to enable LCD support (for output to LCD
1223 display); also select one of the supported displays
1224 by defining one of these:
1228 HITACHI TX09D70VM1CCA, 3.5", 240x320.
1230 CONFIG_NEC_NL6448AC33:
1232 NEC NL6448AC33-18. Active, color, single scan.
1234 CONFIG_NEC_NL6448BC20
1236 NEC NL6448BC20-08. 6.5", 640x480.
1237 Active, color, single scan.
1239 CONFIG_NEC_NL6448BC33_54
1241 NEC NL6448BC33-54. 10.4", 640x480.
1242 Active, color, single scan.
1246 Sharp 320x240. Active, color, single scan.
1247 It isn't 16x9, and I am not sure what it is.
1249 CONFIG_SHARP_LQ64D341
1251 Sharp LQ64D341 display, 640x480.
1252 Active, color, single scan.
1256 HLD1045 display, 640x480.
1257 Active, color, single scan.
1261 Optrex CBL50840-2 NF-FW 99 22 M5
1263 Hitachi LMG6912RPFC-00T
1267 320x240. Black & white.
1269 Normally display is black on white background; define
1270 CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1272 - Splash Screen Support: CONFIG_SPLASH_SCREEN
1274 If this option is set, the environment is checked for
1275 a variable "splashimage". If found, the usual display
1276 of logo, copyright and system information on the LCD
1277 is suppressed and the BMP image at the address
1278 specified in "splashimage" is loaded instead. The
1279 console is redirected to the "nulldev", too. This
1280 allows for a "silent" boot where a splash screen is
1281 loaded very quickly after power-on.
1283 CONFIG_SPLASH_SCREEN_ALIGN
1285 If this option is set the splash image can be freely positioned
1286 on the screen. Environment variable "splashpos" specifies the
1287 position as "x,y". If a positive number is given it is used as
1288 number of pixel from left/top. If a negative number is given it
1289 is used as number of pixel from right/bottom. You can also
1290 specify 'm' for centering the image.
1293 setenv splashpos m,m
1294 => image at center of screen
1296 setenv splashpos 30,20
1297 => image at x = 30 and y = 20
1299 setenv splashpos -10,m
1300 => vertically centered image
1301 at x = dspWidth - bmpWidth - 9
1303 - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1305 If this option is set, additionally to standard BMP
1306 images, gzipped BMP images can be displayed via the
1307 splashscreen support or the bmp command.
1309 - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1311 If this option is set, 8-bit RLE compressed BMP images
1312 can be displayed via the splashscreen support or the
1315 - Compression support:
1318 If this option is set, support for bzip2 compressed
1319 images is included. If not, only uncompressed and gzip
1320 compressed images are supported.
1322 NOTE: the bzip2 algorithm requires a lot of RAM, so
1323 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1328 If this option is set, support for lzma compressed
1331 Note: The LZMA algorithm adds between 2 and 4KB of code and it
1332 requires an amount of dynamic memory that is given by the
1335 (1846 + 768 << (lc + lp)) * sizeof(uint16)
1337 Where lc and lp stand for, respectively, Literal context bits
1338 and Literal pos bits.
1340 This value is upper-bounded by 14MB in the worst case. Anyway,
1341 for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1342 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1343 a very small buffer.
1345 Use the lzmainfo tool to determinate the lc and lp values and
1346 then calculate the amount of needed dynamic memory (ensuring
1347 the appropriate CONFIG_SYS_MALLOC_LEN value).
1352 The address of PHY on MII bus.
1354 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1356 The clock frequency of the MII bus
1360 If this option is set, support for speed/duplex
1361 detection of gigabit PHY is included.
1363 CONFIG_PHY_RESET_DELAY
1365 Some PHY like Intel LXT971A need extra delay after
1366 reset before any MII register access is possible.
1367 For such PHY, set this option to the usec delay
1368 required. (minimum 300usec for LXT971A)
1370 CONFIG_PHY_CMD_DELAY (ppc4xx)
1372 Some PHY like Intel LXT971A need extra delay after
1373 command issued before MII status register can be read
1383 Define a default value for Ethernet address to use
1384 for the respective Ethernet interface, in case this
1385 is not determined automatically.
1390 Define a default value for the IP address to use for
1391 the default Ethernet interface, in case this is not
1392 determined through e.g. bootp.
1394 - Server IP address:
1397 Defines a default value for the IP address of a TFTP
1398 server to contact when using the "tftboot" command.
1400 CONFIG_KEEP_SERVERADDR
1402 Keeps the server's MAC address, in the env 'serveraddr'
1403 for passing to bootargs (like Linux's netconsole option)
1405 - Multicast TFTP Mode:
1408 Defines whether you want to support multicast TFTP as per
1409 rfc-2090; for example to work with atftp. Lets lots of targets
1410 tftp down the same boot image concurrently. Note: the Ethernet
1411 driver in use must provide a function: mcast() to join/leave a
1414 - BOOTP Recovery Mode:
1415 CONFIG_BOOTP_RANDOM_DELAY
1417 If you have many targets in a network that try to
1418 boot using BOOTP, you may want to avoid that all
1419 systems send out BOOTP requests at precisely the same
1420 moment (which would happen for instance at recovery
1421 from a power failure, when all systems will try to
1422 boot, thus flooding the BOOTP server. Defining
1423 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1424 inserted before sending out BOOTP requests. The
1425 following delays are inserted then:
1427 1st BOOTP request: delay 0 ... 1 sec
1428 2nd BOOTP request: delay 0 ... 2 sec
1429 3rd BOOTP request: delay 0 ... 4 sec
1431 BOOTP requests: delay 0 ... 8 sec
1433 - DHCP Advanced Options:
1434 You can fine tune the DHCP functionality by defining
1435 CONFIG_BOOTP_* symbols:
1437 CONFIG_BOOTP_SUBNETMASK
1438 CONFIG_BOOTP_GATEWAY
1439 CONFIG_BOOTP_HOSTNAME
1440 CONFIG_BOOTP_NISDOMAIN
1441 CONFIG_BOOTP_BOOTPATH
1442 CONFIG_BOOTP_BOOTFILESIZE
1445 CONFIG_BOOTP_SEND_HOSTNAME
1446 CONFIG_BOOTP_NTPSERVER
1447 CONFIG_BOOTP_TIMEOFFSET
1448 CONFIG_BOOTP_VENDOREX
1450 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1451 environment variable, not the BOOTP server.
1453 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1454 serverip from a DHCP server, it is possible that more
1455 than one DNS serverip is offered to the client.
1456 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1457 serverip will be stored in the additional environment
1458 variable "dnsip2". The first DNS serverip is always
1459 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
1462 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1463 to do a dynamic update of a DNS server. To do this, they
1464 need the hostname of the DHCP requester.
1465 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
1466 of the "hostname" environment variable is passed as
1467 option 12 to the DHCP server.
1469 CONFIG_BOOTP_DHCP_REQUEST_DELAY
1471 A 32bit value in microseconds for a delay between
1472 receiving a "DHCP Offer" and sending the "DHCP Request".
1473 This fixes a problem with certain DHCP servers that don't
1474 respond 100% of the time to a "DHCP request". E.g. On an
1475 AT91RM9200 processor running at 180MHz, this delay needed
1476 to be *at least* 15,000 usec before a Windows Server 2003
1477 DHCP server would reply 100% of the time. I recommend at
1478 least 50,000 usec to be safe. The alternative is to hope
1479 that one of the retries will be successful but note that
1480 the DHCP timeout and retry process takes a longer than
1484 CONFIG_CDP_DEVICE_ID
1486 The device id used in CDP trigger frames.
1488 CONFIG_CDP_DEVICE_ID_PREFIX
1490 A two character string which is prefixed to the MAC address
1495 A printf format string which contains the ascii name of
1496 the port. Normally is set to "eth%d" which sets
1497 eth0 for the first Ethernet, eth1 for the second etc.
1499 CONFIG_CDP_CAPABILITIES
1501 A 32bit integer which indicates the device capabilities;
1502 0x00000010 for a normal host which does not forwards.
1506 An ascii string containing the version of the software.
1510 An ascii string containing the name of the platform.
1514 A 32bit integer sent on the trigger.
1516 CONFIG_CDP_POWER_CONSUMPTION
1518 A 16bit integer containing the power consumption of the
1519 device in .1 of milliwatts.
1521 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1523 A byte containing the id of the VLAN.
1525 - Status LED: CONFIG_STATUS_LED
1527 Several configurations allow to display the current
1528 status using a LED. For instance, the LED will blink
1529 fast while running U-Boot code, stop blinking as
1530 soon as a reply to a BOOTP request was received, and
1531 start blinking slow once the Linux kernel is running
1532 (supported by a status LED driver in the Linux
1533 kernel). Defining CONFIG_STATUS_LED enables this
1536 - CAN Support: CONFIG_CAN_DRIVER
1538 Defining CONFIG_CAN_DRIVER enables CAN driver support
1539 on those systems that support this (optional)
1540 feature, like the TQM8xxL modules.
1542 - I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1544 These enable I2C serial bus commands. Defining either of
1545 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
1546 include the appropriate I2C driver for the selected CPU.
1548 This will allow you to use i2c commands at the u-boot
1549 command line (as long as you set CONFIG_CMD_I2C in
1550 CONFIG_COMMANDS) and communicate with i2c based realtime
1551 clock chips. See common/cmd_i2c.c for a description of the
1552 command line interface.
1554 CONFIG_HARD_I2C selects a hardware I2C controller.
1556 CONFIG_SOFT_I2C configures u-boot to use a software (aka
1557 bit-banging) driver instead of CPM or similar hardware
1560 There are several other quantities that must also be
1561 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1563 In both cases you will need to define CONFIG_SYS_I2C_SPEED
1564 to be the frequency (in Hz) at which you wish your i2c bus
1565 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
1566 the CPU's i2c node address).
1568 Now, the u-boot i2c code for the mpc8xx
1569 (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
1570 and so its address should therefore be cleared to 0 (See,
1571 eg, MPC823e User's Manual p.16-473). So, set
1572 CONFIG_SYS_I2C_SLAVE to 0.
1574 CONFIG_SYS_I2C_INIT_MPC5XXX
1576 When a board is reset during an i2c bus transfer
1577 chips might think that the current transfer is still
1578 in progress. Reset the slave devices by sending start
1579 commands until the slave device responds.
1581 That's all that's required for CONFIG_HARD_I2C.
1583 If you use the software i2c interface (CONFIG_SOFT_I2C)
1584 then the following macros need to be defined (examples are
1585 from include/configs/lwmon.h):
1589 (Optional). Any commands necessary to enable the I2C
1590 controller or configure ports.
1592 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
1596 (Only for MPC8260 CPU). The I/O port to use (the code
1597 assumes both bits are on the same port). Valid values
1598 are 0..3 for ports A..D.
1602 The code necessary to make the I2C data line active
1603 (driven). If the data line is open collector, this
1606 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1610 The code necessary to make the I2C data line tri-stated
1611 (inactive). If the data line is open collector, this
1614 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1618 Code that returns TRUE if the I2C data line is high,
1621 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1625 If <bit> is TRUE, sets the I2C data line high. If it
1626 is FALSE, it clears it (low).
1628 eg: #define I2C_SDA(bit) \
1629 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
1630 else immr->im_cpm.cp_pbdat &= ~PB_SDA
1634 If <bit> is TRUE, sets the I2C clock line high. If it
1635 is FALSE, it clears it (low).
1637 eg: #define I2C_SCL(bit) \
1638 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
1639 else immr->im_cpm.cp_pbdat &= ~PB_SCL
1643 This delay is invoked four times per clock cycle so this
1644 controls the rate of data transfer. The data rate thus
1645 is 1 / (I2C_DELAY * 4). Often defined to be something
1648 #define I2C_DELAY udelay(2)
1650 CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1652 If your arch supports the generic GPIO framework (asm/gpio.h),
1653 then you may alternatively define the two GPIOs that are to be
1654 used as SCL / SDA. Any of the previous I2C_xxx macros will
1655 have GPIO-based defaults assigned to them as appropriate.
1657 You should define these to the GPIO value as given directly to
1658 the generic GPIO functions.
1660 CONFIG_SYS_I2C_INIT_BOARD
1662 When a board is reset during an i2c bus transfer
1663 chips might think that the current transfer is still
1664 in progress. On some boards it is possible to access
1665 the i2c SCLK line directly, either by using the
1666 processor pin as a GPIO or by having a second pin
1667 connected to the bus. If this option is defined a
1668 custom i2c_init_board() routine in boards/xxx/board.c
1669 is run early in the boot sequence.
1671 CONFIG_SYS_I2C_BOARD_LATE_INIT
1673 An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
1674 defined a custom i2c_board_late_init() routine in
1675 boards/xxx/board.c is run AFTER the operations in i2c_init()
1676 is completed. This callpoint can be used to unreset i2c bus
1677 using CPU i2c controller register accesses for CPUs whose i2c
1678 controller provide such a method. It is called at the end of
1679 i2c_init() to allow i2c_init operations to setup the i2c bus
1680 controller on the CPU (e.g. setting bus speed & slave address).
1682 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1684 This option enables configuration of bi_iic_fast[] flags
1685 in u-boot bd_info structure based on u-boot environment
1686 variable "i2cfast". (see also i2cfast)
1688 CONFIG_I2C_MULTI_BUS
1690 This option allows the use of multiple I2C buses, each of which
1691 must have a controller. At any point in time, only one bus is
1692 active. To switch to a different bus, use the 'i2c dev' command.
1693 Note that bus numbering is zero-based.
1695 CONFIG_SYS_I2C_NOPROBES
1697 This option specifies a list of I2C devices that will be skipped
1698 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
1699 is set, specify a list of bus-device pairs. Otherwise, specify
1700 a 1D array of device addresses
1703 #undef CONFIG_I2C_MULTI_BUS
1704 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
1706 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1708 #define CONFIG_I2C_MULTI_BUS
1709 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
1711 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1713 CONFIG_SYS_SPD_BUS_NUM
1715 If defined, then this indicates the I2C bus number for DDR SPD.
1716 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1718 CONFIG_SYS_RTC_BUS_NUM
1720 If defined, then this indicates the I2C bus number for the RTC.
1721 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
1723 CONFIG_SYS_DTT_BUS_NUM
1725 If defined, then this indicates the I2C bus number for the DTT.
1726 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
1728 CONFIG_SYS_I2C_DTT_ADDR:
1730 If defined, specifies the I2C address of the DTT device.
1731 If not defined, then U-Boot uses predefined value for
1732 specified DTT device.
1736 Define this option if you want to use Freescale's I2C driver in
1737 drivers/i2c/fsl_i2c.c.
1741 Define this option if you have I2C devices reached over 1 .. n
1742 I2C Muxes like the pca9544a. This option addes a new I2C
1743 Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
1744 new I2C Bus to the existing I2C Busses. If you select the
1745 new Bus with "i2c dev", u-bbot sends first the commandos for
1746 the muxes to activate this new "bus".
1748 CONFIG_I2C_MULTI_BUS must be also defined, to use this
1752 Adding a new I2C Bus reached over 2 pca9544a muxes
1753 The First mux with address 70 and channel 6
1754 The Second mux with address 71 and channel 4
1756 => i2c bus pca9544a:70:6:pca9544a:71:4
1758 Use the "i2c bus" command without parameter, to get a list
1759 of I2C Busses with muxes:
1762 Busses reached over muxes:
1764 reached over Mux(es):
1767 reached over Mux(es):
1772 If you now switch to the new I2C Bus 3 with "i2c dev 3"
1773 u-boot first sends the command to the mux@70 to enable
1774 channel 6, and then the command to the mux@71 to enable
1777 After that, you can use the "normal" i2c commands as
1778 usual to communicate with your I2C devices behind
1781 This option is actually implemented for the bitbanging
1782 algorithm in common/soft_i2c.c and for the Hardware I2C
1783 Bus on the MPC8260. But it should be not so difficult
1784 to add this option to other architectures.
1786 CONFIG_SOFT_I2C_READ_REPEATED_START
1788 defining this will force the i2c_read() function in
1789 the soft_i2c driver to perform an I2C repeated start
1790 between writing the address pointer and reading the
1791 data. If this define is omitted the default behaviour
1792 of doing a stop-start sequence will be used. Most I2C
1793 devices can use either method, but some require one or
1796 - SPI Support: CONFIG_SPI
1798 Enables SPI driver (so far only tested with
1799 SPI EEPROM, also an instance works with Crystal A/D and
1800 D/As on the SACSng board)
1804 Enables the driver for SPI controller on SuperH. Currently
1805 only SH7757 is supported.
1809 Enables extended (16-bit) SPI EEPROM addressing.
1810 (symmetrical to CONFIG_I2C_X)
1814 Enables a software (bit-bang) SPI driver rather than
1815 using hardware support. This is a general purpose
1816 driver that only requires three general I/O port pins
1817 (two outputs, one input) to function. If this is
1818 defined, the board configuration must define several
1819 SPI configuration items (port pins to use, etc). For
1820 an example, see include/configs/sacsng.h.
1824 Enables a hardware SPI driver for general-purpose reads
1825 and writes. As with CONFIG_SOFT_SPI, the board configuration
1826 must define a list of chip-select function pointers.
1827 Currently supported on some MPC8xxx processors. For an
1828 example, see include/configs/mpc8349emds.h.
1832 Enables the driver for the SPI controllers on i.MX and MXC
1833 SoCs. Currently only i.MX31 is supported.
1835 - FPGA Support: CONFIG_FPGA
1837 Enables FPGA subsystem.
1839 CONFIG_FPGA_<vendor>
1841 Enables support for specific chip vendors.
1844 CONFIG_FPGA_<family>
1846 Enables support for FPGA family.
1847 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
1851 Specify the number of FPGA devices to support.
1853 CONFIG_SYS_FPGA_PROG_FEEDBACK
1855 Enable printing of hash marks during FPGA configuration.
1857 CONFIG_SYS_FPGA_CHECK_BUSY
1859 Enable checks on FPGA configuration interface busy
1860 status by the configuration function. This option
1861 will require a board or device specific function to
1866 If defined, a function that provides delays in the FPGA
1867 configuration driver.
1869 CONFIG_SYS_FPGA_CHECK_CTRLC
1870 Allow Control-C to interrupt FPGA configuration
1872 CONFIG_SYS_FPGA_CHECK_ERROR
1874 Check for configuration errors during FPGA bitfile
1875 loading. For example, abort during Virtex II
1876 configuration if the INIT_B line goes low (which
1877 indicated a CRC error).
1879 CONFIG_SYS_FPGA_WAIT_INIT
1881 Maximum time to wait for the INIT_B line to deassert
1882 after PROB_B has been deasserted during a Virtex II
1883 FPGA configuration sequence. The default time is 500
1886 CONFIG_SYS_FPGA_WAIT_BUSY
1888 Maximum time to wait for BUSY to deassert during
1889 Virtex II FPGA configuration. The default is 5 ms.
1891 CONFIG_SYS_FPGA_WAIT_CONFIG
1893 Time to wait after FPGA configuration. The default is
1896 - Configuration Management:
1899 If defined, this string will be added to the U-Boot
1900 version information (U_BOOT_VERSION)
1902 - Vendor Parameter Protection:
1904 U-Boot considers the values of the environment
1905 variables "serial#" (Board Serial Number) and
1906 "ethaddr" (Ethernet Address) to be parameters that
1907 are set once by the board vendor / manufacturer, and
1908 protects these variables from casual modification by
1909 the user. Once set, these variables are read-only,
1910 and write or delete attempts are rejected. You can
1911 change this behaviour:
1913 If CONFIG_ENV_OVERWRITE is #defined in your config
1914 file, the write protection for vendor parameters is
1915 completely disabled. Anybody can change or delete
1918 Alternatively, if you #define _both_ CONFIG_ETHADDR
1919 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1920 Ethernet address is installed in the environment,
1921 which can be changed exactly ONCE by the user. [The
1922 serial# is unaffected by this, i. e. it remains
1928 Define this variable to enable the reservation of
1929 "protected RAM", i. e. RAM which is not overwritten
1930 by U-Boot. Define CONFIG_PRAM to hold the number of
1931 kB you want to reserve for pRAM. You can overwrite
1932 this default value by defining an environment
1933 variable "pram" to the number of kB you want to
1934 reserve. Note that the board info structure will
1935 still show the full amount of RAM. If pRAM is
1936 reserved, a new environment variable "mem" will
1937 automatically be defined to hold the amount of
1938 remaining RAM in a form that can be passed as boot
1939 argument to Linux, for instance like that:
1941 setenv bootargs ... mem=\${mem}
1944 This way you can tell Linux not to use this memory,
1945 either, which results in a memory region that will
1946 not be affected by reboots.
1948 *WARNING* If your board configuration uses automatic
1949 detection of the RAM size, you must make sure that
1950 this memory test is non-destructive. So far, the
1951 following board configurations are known to be
1954 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1955 HERMES, IP860, RPXlite, LWMON, LANTEC,
1961 Define this variable to stop the system in case of a
1962 fatal error, so that you have to reset it manually.
1963 This is probably NOT a good idea for an embedded
1964 system where you want the system to reboot
1965 automatically as fast as possible, but it may be
1966 useful during development since you can try to debug
1967 the conditions that lead to the situation.
1969 CONFIG_NET_RETRY_COUNT
1971 This variable defines the number of retries for
1972 network operations like ARP, RARP, TFTP, or BOOTP
1973 before giving up the operation. If not defined, a
1974 default value of 5 is used.
1978 Timeout waiting for an ARP reply in milliseconds.
1980 - Command Interpreter:
1981 CONFIG_AUTO_COMPLETE
1983 Enable auto completion of commands using TAB.
1985 Note that this feature has NOT been implemented yet
1986 for the "hush" shell.
1989 CONFIG_SYS_HUSH_PARSER
1991 Define this variable to enable the "hush" shell (from
1992 Busybox) as command line interpreter, thus enabling
1993 powerful command line syntax like
1994 if...then...else...fi conditionals or `&&' and '||'
1995 constructs ("shell scripts").
1997 If undefined, you get the old, much simpler behaviour
1998 with a somewhat smaller memory footprint.
2001 CONFIG_SYS_PROMPT_HUSH_PS2
2003 This defines the secondary prompt string, which is
2004 printed when the command interpreter needs more input
2005 to complete a command. Usually "> ".
2009 In the current implementation, the local variables
2010 space and global environment variables space are
2011 separated. Local variables are those you define by
2012 simply typing `name=value'. To access a local
2013 variable later on, you have write `$name' or
2014 `${name}'; to execute the contents of a variable
2015 directly type `$name' at the command prompt.
2017 Global environment variables are those you use
2018 setenv/printenv to work with. To run a command stored
2019 in such a variable, you need to use the run command,
2020 and you must not use the '$' sign to access them.
2022 To store commands and special characters in a
2023 variable, please use double quotation marks
2024 surrounding the whole text of the variable, instead
2025 of the backslashes before semicolons and special
2028 - Commandline Editing and History:
2029 CONFIG_CMDLINE_EDITING
2031 Enable editing and History functions for interactive
2032 commandline input operations
2034 - Default Environment:
2035 CONFIG_EXTRA_ENV_SETTINGS
2037 Define this to contain any number of null terminated
2038 strings (variable = value pairs) that will be part of
2039 the default environment compiled into the boot image.
2041 For example, place something like this in your
2042 board's config file:
2044 #define CONFIG_EXTRA_ENV_SETTINGS \
2048 Warning: This method is based on knowledge about the
2049 internal format how the environment is stored by the
2050 U-Boot code. This is NOT an official, exported
2051 interface! Although it is unlikely that this format
2052 will change soon, there is no guarantee either.
2053 You better know what you are doing here.
2055 Note: overly (ab)use of the default environment is
2056 discouraged. Make sure to check other ways to preset
2057 the environment like the "source" command or the
2060 - DataFlash Support:
2061 CONFIG_HAS_DATAFLASH
2063 Defining this option enables DataFlash features and
2064 allows to read/write in Dataflash via the standard
2067 - SystemACE Support:
2070 Adding this option adds support for Xilinx SystemACE
2071 chips attached via some sort of local bus. The address
2072 of the chip must also be defined in the
2073 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
2075 #define CONFIG_SYSTEMACE
2076 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
2078 When SystemACE support is added, the "ace" device type
2079 becomes available to the fat commands, i.e. fatls.
2081 - TFTP Fixed UDP Port:
2084 If this is defined, the environment variable tftpsrcp
2085 is used to supply the TFTP UDP source port value.
2086 If tftpsrcp isn't defined, the normal pseudo-random port
2087 number generator is used.
2089 Also, the environment variable tftpdstp is used to supply
2090 the TFTP UDP destination port value. If tftpdstp isn't
2091 defined, the normal port 69 is used.
2093 The purpose for tftpsrcp is to allow a TFTP server to
2094 blindly start the TFTP transfer using the pre-configured
2095 target IP address and UDP port. This has the effect of
2096 "punching through" the (Windows XP) firewall, allowing
2097 the remainder of the TFTP transfer to proceed normally.
2098 A better solution is to properly configure the firewall,
2099 but sometimes that is not allowed.
2101 - Show boot progress:
2102 CONFIG_SHOW_BOOT_PROGRESS
2104 Defining this option allows to add some board-
2105 specific code (calling a user-provided function
2106 "show_boot_progress(int)") that enables you to show
2107 the system's boot progress on some display (for
2108 example, some LED's) on your board. At the moment,
2109 the following checkpoints are implemented:
2111 - Standalone program support:
2112 CONFIG_STANDALONE_LOAD_ADDR
2114 This option allows to define board specific values
2115 for the address where standalone program gets loaded,
2116 thus overwriting the architecutre dependent default
2119 - Frame Buffer Address:
2122 Define CONFIG_FB_ADDR if you want to use specific address for
2124 Then system will reserve the frame buffer address to defined address
2125 instead of lcd_setmem (this function grab the memory for frame buffer
2128 Please see board_init_f function.
2130 If you want this config option then,
2131 please define it at your board config file
2133 Legacy uImage format:
2136 1 common/cmd_bootm.c before attempting to boot an image
2137 -1 common/cmd_bootm.c Image header has bad magic number
2138 2 common/cmd_bootm.c Image header has correct magic number
2139 -2 common/cmd_bootm.c Image header has bad checksum
2140 3 common/cmd_bootm.c Image header has correct checksum
2141 -3 common/cmd_bootm.c Image data has bad checksum
2142 4 common/cmd_bootm.c Image data has correct checksum
2143 -4 common/cmd_bootm.c Image is for unsupported architecture
2144 5 common/cmd_bootm.c Architecture check OK
2145 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
2146 6 common/cmd_bootm.c Image Type check OK
2147 -6 common/cmd_bootm.c gunzip uncompression error
2148 -7 common/cmd_bootm.c Unimplemented compression type
2149 7 common/cmd_bootm.c Uncompression OK
2150 8 common/cmd_bootm.c No uncompress/copy overwrite error
2151 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
2153 9 common/image.c Start initial ramdisk verification
2154 -10 common/image.c Ramdisk header has bad magic number
2155 -11 common/image.c Ramdisk header has bad checksum
2156 10 common/image.c Ramdisk header is OK
2157 -12 common/image.c Ramdisk data has bad checksum
2158 11 common/image.c Ramdisk data has correct checksum
2159 12 common/image.c Ramdisk verification complete, start loading
2160 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
2161 13 common/image.c Start multifile image verification
2162 14 common/image.c No initial ramdisk, no multifile, continue.
2164 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2166 -30 arch/powerpc/lib/board.c Fatal error, hang the system
2167 -31 post/post.c POST test failed, detected by post_output_backlog()
2168 -32 post/post.c POST test failed, detected by post_run_single()
2170 34 common/cmd_doc.c before loading a Image from a DOC device
2171 -35 common/cmd_doc.c Bad usage of "doc" command
2172 35 common/cmd_doc.c correct usage of "doc" command
2173 -36 common/cmd_doc.c No boot device
2174 36 common/cmd_doc.c correct boot device
2175 -37 common/cmd_doc.c Unknown Chip ID on boot device
2176 37 common/cmd_doc.c correct chip ID found, device available
2177 -38 common/cmd_doc.c Read Error on boot device
2178 38 common/cmd_doc.c reading Image header from DOC device OK
2179 -39 common/cmd_doc.c Image header has bad magic number
2180 39 common/cmd_doc.c Image header has correct magic number
2181 -40 common/cmd_doc.c Error reading Image from DOC device
2182 40 common/cmd_doc.c Image header has correct magic number
2183 41 common/cmd_ide.c before loading a Image from a IDE device
2184 -42 common/cmd_ide.c Bad usage of "ide" command
2185 42 common/cmd_ide.c correct usage of "ide" command
2186 -43 common/cmd_ide.c No boot device
2187 43 common/cmd_ide.c boot device found
2188 -44 common/cmd_ide.c Device not available
2189 44 common/cmd_ide.c Device available
2190 -45 common/cmd_ide.c wrong partition selected
2191 45 common/cmd_ide.c partition selected
2192 -46 common/cmd_ide.c Unknown partition table
2193 46 common/cmd_ide.c valid partition table found
2194 -47 common/cmd_ide.c Invalid partition type
2195 47 common/cmd_ide.c correct partition type
2196 -48 common/cmd_ide.c Error reading Image Header on boot device
2197 48 common/cmd_ide.c reading Image Header from IDE device OK
2198 -49 common/cmd_ide.c Image header has bad magic number
2199 49 common/cmd_ide.c Image header has correct magic number
2200 -50 common/cmd_ide.c Image header has bad checksum
2201 50 common/cmd_ide.c Image header has correct checksum
2202 -51 common/cmd_ide.c Error reading Image from IDE device
2203 51 common/cmd_ide.c reading Image from IDE device OK
2204 52 common/cmd_nand.c before loading a Image from a NAND device
2205 -53 common/cmd_nand.c Bad usage of "nand" command
2206 53 common/cmd_nand.c correct usage of "nand" command
2207 -54 common/cmd_nand.c No boot device
2208 54 common/cmd_nand.c boot device found
2209 -55 common/cmd_nand.c Unknown Chip ID on boot device
2210 55 common/cmd_nand.c correct chip ID found, device available
2211 -56 common/cmd_nand.c Error reading Image Header on boot device
2212 56 common/cmd_nand.c reading Image Header from NAND device OK
2213 -57 common/cmd_nand.c Image header has bad magic number
2214 57 common/cmd_nand.c Image header has correct magic number
2215 -58 common/cmd_nand.c Error reading Image from NAND device
2216 58 common/cmd_nand.c reading Image from NAND device OK
2218 -60 common/env_common.c Environment has a bad CRC, using default
2220 64 net/eth.c starting with Ethernet configuration.
2221 -64 net/eth.c no Ethernet found.
2222 65 net/eth.c Ethernet found.
2224 -80 common/cmd_net.c usage wrong
2225 80 common/cmd_net.c before calling NetLoop()
2226 -81 common/cmd_net.c some error in NetLoop() occurred
2227 81 common/cmd_net.c NetLoop() back without error
2228 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
2229 82 common/cmd_net.c trying automatic boot
2230 83 common/cmd_net.c running "source" command
2231 -83 common/cmd_net.c some error in automatic boot or "source" command
2232 84 common/cmd_net.c end without errors
2237 100 common/cmd_bootm.c Kernel FIT Image has correct format
2238 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
2239 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
2240 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
2241 102 common/cmd_bootm.c Kernel unit name specified
2242 -103 common/cmd_bootm.c Can't get kernel subimage node offset
2243 103 common/cmd_bootm.c Found configuration node
2244 104 common/cmd_bootm.c Got kernel subimage node offset
2245 -104 common/cmd_bootm.c Kernel subimage hash verification failed
2246 105 common/cmd_bootm.c Kernel subimage hash verification OK
2247 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
2248 106 common/cmd_bootm.c Architecture check OK
2249 -106 common/cmd_bootm.c Kernel subimage has wrong type
2250 107 common/cmd_bootm.c Kernel subimage type OK
2251 -107 common/cmd_bootm.c Can't get kernel subimage data/size
2252 108 common/cmd_bootm.c Got kernel subimage data/size
2253 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
2254 -109 common/cmd_bootm.c Can't get kernel subimage type
2255 -110 common/cmd_bootm.c Can't get kernel subimage comp
2256 -111 common/cmd_bootm.c Can't get kernel subimage os
2257 -112 common/cmd_bootm.c Can't get kernel subimage load address
2258 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
2260 120 common/image.c Start initial ramdisk verification
2261 -120 common/image.c Ramdisk FIT image has incorrect format
2262 121 common/image.c Ramdisk FIT image has correct format
2263 122 common/image.c No ramdisk subimage unit name, using configuration
2264 -122 common/image.c Can't get configuration for ramdisk subimage
2265 123 common/image.c Ramdisk unit name specified
2266 -124 common/image.c Can't get ramdisk subimage node offset
2267 125 common/image.c Got ramdisk subimage node offset
2268 -125 common/image.c Ramdisk subimage hash verification failed
2269 126 common/image.c Ramdisk subimage hash verification OK
2270 -126 common/image.c Ramdisk subimage for unsupported architecture
2271 127 common/image.c Architecture check OK
2272 -127 common/image.c Can't get ramdisk subimage data/size
2273 128 common/image.c Got ramdisk subimage data/size
2274 129 common/image.c Can't get ramdisk load address
2275 -129 common/image.c Got ramdisk load address
2277 -130 common/cmd_doc.c Incorrect FIT image format
2278 131 common/cmd_doc.c FIT image format OK
2280 -140 common/cmd_ide.c Incorrect FIT image format
2281 141 common/cmd_ide.c FIT image format OK
2283 -150 common/cmd_nand.c Incorrect FIT image format
2284 151 common/cmd_nand.c FIT image format OK
2286 - Automatic software updates via TFTP server
2288 CONFIG_UPDATE_TFTP_CNT_MAX
2289 CONFIG_UPDATE_TFTP_MSEC_MAX
2291 These options enable and control the auto-update feature;
2292 for a more detailed description refer to doc/README.update.
2294 - MTD Support (mtdparts command, UBI support)
2297 Adds the MTD device infrastructure from the Linux kernel.
2298 Needed for mtdparts command support.
2300 CONFIG_MTD_PARTITIONS
2302 Adds the MTD partitioning infrastructure from the Linux
2303 kernel. Needed for UBI support.
2307 Enable building of SPL globally.
2309 CONFIG_SPL_TEXT_BASE
2310 TEXT_BASE for linking the SPL binary.
2313 LDSCRIPT for linking the SPL binary.
2315 CONFIG_SPL_LIBCOMMON_SUPPORT
2316 Support for common/libcommon.o in SPL binary
2318 CONFIG_SPL_LIBDISK_SUPPORT
2319 Support for disk/libdisk.o in SPL binary
2321 CONFIG_SPL_I2C_SUPPORT
2322 Support for drivers/i2c/libi2c.o in SPL binary
2324 CONFIG_SPL_GPIO_SUPPORT
2325 Support for drivers/gpio/libgpio.o in SPL binary
2327 CONFIG_SPL_MMC_SUPPORT
2328 Support for drivers/mmc/libmmc.o in SPL binary
2330 CONFIG_SPL_SERIAL_SUPPORT
2331 Support for drivers/serial/libserial.o in SPL binary
2333 CONFIG_SPL_SPI_FLASH_SUPPORT
2334 Support for drivers/mtd/spi/libspi_flash.o in SPL binary
2336 CONFIG_SPL_SPI_SUPPORT
2337 Support for drivers/spi/libspi.o in SPL binary
2339 CONFIG_SPL_FAT_SUPPORT
2340 Support for fs/fat/libfat.o in SPL binary
2342 CONFIG_SPL_LIBGENERIC_SUPPORT
2343 Support for lib/libgeneric.o in SPL binary
2348 [so far only for SMDK2400 boards]
2350 - Modem support enable:
2351 CONFIG_MODEM_SUPPORT
2353 - RTS/CTS Flow control enable:
2356 - Modem debug support:
2357 CONFIG_MODEM_SUPPORT_DEBUG
2359 Enables debugging stuff (char screen[1024], dbg())
2360 for modem support. Useful only with BDI2000.
2362 - Interrupt support (PPC):
2364 There are common interrupt_init() and timer_interrupt()
2365 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
2366 for CPU specific initialization. interrupt_init_cpu()
2367 should set decrementer_count to appropriate value. If
2368 CPU resets decrementer automatically after interrupt
2369 (ppc4xx) it should set decrementer_count to zero.
2370 timer_interrupt() calls timer_interrupt_cpu() for CPU
2371 specific handling. If board has watchdog / status_led
2372 / other_activity_monitor it works automatically from
2373 general timer_interrupt().
2377 In the target system modem support is enabled when a
2378 specific key (key combination) is pressed during
2379 power-on. Otherwise U-Boot will boot normally
2380 (autoboot). The key_pressed() function is called from
2381 board_init(). Currently key_pressed() is a dummy
2382 function, returning 1 and thus enabling modem
2385 If there are no modem init strings in the
2386 environment, U-Boot proceed to autoboot; the
2387 previous output (banner, info printfs) will be
2390 See also: doc/README.Modem
2393 Configuration Settings:
2394 -----------------------
2396 - CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2397 undefine this when you're short of memory.
2399 - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
2400 width of the commands listed in the 'help' command output.
2402 - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
2403 prompt for user input.
2405 - CONFIG_SYS_CBSIZE: Buffer size for input from the Console
2407 - CONFIG_SYS_PBSIZE: Buffer size for Console output
2409 - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
2411 - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2412 the application (usually a Linux kernel) when it is
2415 - CONFIG_SYS_BAUDRATE_TABLE:
2416 List of legal baudrate settings for this board.
2418 - CONFIG_SYS_CONSOLE_INFO_QUIET
2419 Suppress display of console information at boot.
2421 - CONFIG_SYS_CONSOLE_IS_IN_ENV
2422 If the board specific function
2423 extern int overwrite_console (void);
2424 returns 1, the stdin, stderr and stdout are switched to the
2425 serial port, else the settings in the environment are used.
2427 - CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2428 Enable the call to overwrite_console().
2430 - CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2431 Enable overwrite of previous console environment settings.
2433 - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2434 Begin and End addresses of the area used by the
2437 - CONFIG_SYS_ALT_MEMTEST:
2438 Enable an alternate, more extensive memory test.
2440 - CONFIG_SYS_MEMTEST_SCRATCH:
2441 Scratch address used by the alternate memory test
2442 You only need to set this if address zero isn't writeable
2444 - CONFIG_SYS_MEM_TOP_HIDE (PPC only):
2445 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
2446 this specified memory area will get subtracted from the top
2447 (end) of RAM and won't get "touched" at all by U-Boot. By
2448 fixing up gd->ram_size the Linux kernel should gets passed
2449 the now "corrected" memory size and won't touch it either.
2450 This should work for arch/ppc and arch/powerpc. Only Linux
2451 board ports in arch/powerpc with bootwrapper support that
2452 recalculate the memory size from the SDRAM controller setup
2453 will have to get fixed in Linux additionally.
2455 This option can be used as a workaround for the 440EPx/GRx
2456 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
2459 WARNING: Please make sure that this value is a multiple of
2460 the Linux page size (normally 4k). If this is not the case,
2461 then the end address of the Linux memory will be located at a
2462 non page size aligned address and this could cause major
2465 - CONFIG_SYS_TFTP_LOADADDR:
2466 Default load address for network file downloads
2468 - CONFIG_SYS_LOADS_BAUD_CHANGE:
2469 Enable temporary baudrate change while serial download
2471 - CONFIG_SYS_SDRAM_BASE:
2472 Physical start address of SDRAM. _Must_ be 0 here.
2474 - CONFIG_SYS_MBIO_BASE:
2475 Physical start address of Motherboard I/O (if using a
2478 - CONFIG_SYS_FLASH_BASE:
2479 Physical start address of Flash memory.
2481 - CONFIG_SYS_MONITOR_BASE:
2482 Physical start address of boot monitor code (set by
2483 make config files to be same as the text base address
2484 (CONFIG_SYS_TEXT_BASE) used when linking) - same as
2485 CONFIG_SYS_FLASH_BASE when booting from flash.
2487 - CONFIG_SYS_MONITOR_LEN:
2488 Size of memory reserved for monitor code, used to
2489 determine _at_compile_time_ (!) if the environment is
2490 embedded within the U-Boot image, or in a separate
2493 - CONFIG_SYS_MALLOC_LEN:
2494 Size of DRAM reserved for malloc() use.
2496 - CONFIG_SYS_BOOTM_LEN:
2497 Normally compressed uImages are limited to an
2498 uncompressed size of 8 MBytes. If this is not enough,
2499 you can define CONFIG_SYS_BOOTM_LEN in your board config file
2500 to adjust this setting to your needs.
2502 - CONFIG_SYS_BOOTMAPSZ:
2503 Maximum size of memory mapped by the startup code of
2504 the Linux kernel; all data that must be processed by
2505 the Linux kernel (bd_info, boot arguments, FDT blob if
2506 used) must be put below this limit, unless "bootm_low"
2507 enviroment variable is defined and non-zero. In such case
2508 all data for the Linux kernel must be between "bootm_low"
2509 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
2510 variable "bootm_mapsize" will override the value of
2511 CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
2512 then the value in "bootm_size" will be used instead.
2514 - CONFIG_SYS_BOOT_RAMDISK_HIGH:
2515 Enable initrd_high functionality. If defined then the
2516 initrd_high feature is enabled and the bootm ramdisk subcommand
2519 - CONFIG_SYS_BOOT_GET_CMDLINE:
2520 Enables allocating and saving kernel cmdline in space between
2521 "bootm_low" and "bootm_low" + BOOTMAPSZ.
2523 - CONFIG_SYS_BOOT_GET_KBD:
2524 Enables allocating and saving a kernel copy of the bd_info in
2525 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2527 - CONFIG_SYS_MAX_FLASH_BANKS:
2528 Max number of Flash memory banks
2530 - CONFIG_SYS_MAX_FLASH_SECT:
2531 Max number of sectors on a Flash chip
2533 - CONFIG_SYS_FLASH_ERASE_TOUT:
2534 Timeout for Flash erase operations (in ms)
2536 - CONFIG_SYS_FLASH_WRITE_TOUT:
2537 Timeout for Flash write operations (in ms)
2539 - CONFIG_SYS_FLASH_LOCK_TOUT
2540 Timeout for Flash set sector lock bit operation (in ms)
2542 - CONFIG_SYS_FLASH_UNLOCK_TOUT
2543 Timeout for Flash clear lock bits operation (in ms)
2545 - CONFIG_SYS_FLASH_PROTECTION
2546 If defined, hardware flash sectors protection is used
2547 instead of U-Boot software protection.
2549 - CONFIG_SYS_DIRECT_FLASH_TFTP:
2551 Enable TFTP transfers directly to flash memory;
2552 without this option such a download has to be
2553 performed in two steps: (1) download to RAM, and (2)
2554 copy from RAM to flash.
2556 The two-step approach is usually more reliable, since
2557 you can check if the download worked before you erase
2558 the flash, but in some situations (when system RAM is
2559 too limited to allow for a temporary copy of the
2560 downloaded image) this option may be very useful.
2562 - CONFIG_SYS_FLASH_CFI:
2563 Define if the flash driver uses extra elements in the
2564 common flash structure for storing flash geometry.
2566 - CONFIG_FLASH_CFI_DRIVER
2567 This option also enables the building of the cfi_flash driver
2568 in the drivers directory
2570 - CONFIG_FLASH_CFI_MTD
2571 This option enables the building of the cfi_mtd driver
2572 in the drivers directory. The driver exports CFI flash
2575 - CONFIG_SYS_FLASH_USE_BUFFER_WRITE
2576 Use buffered writes to flash.
2578 - CONFIG_FLASH_SPANSION_S29WS_N
2579 s29ws-n MirrorBit flash has non-standard addresses for buffered
2582 - CONFIG_SYS_FLASH_QUIET_TEST
2583 If this option is defined, the common CFI flash doesn't
2584 print it's warning upon not recognized FLASH banks. This
2585 is useful, if some of the configured banks are only
2586 optionally available.
2588 - CONFIG_FLASH_SHOW_PROGRESS
2589 If defined (must be an integer), print out countdown
2590 digits and dots. Recommended value: 45 (9..1) for 80
2591 column displays, 15 (3..1) for 40 column displays.
2593 - CONFIG_SYS_RX_ETH_BUFFER:
2594 Defines the number of Ethernet receive buffers. On some
2595 Ethernet controllers it is recommended to set this value
2596 to 8 or even higher (EEPRO100 or 405 EMAC), since all
2597 buffers can be full shortly after enabling the interface
2598 on high Ethernet traffic.
2599 Defaults to 4 if not defined.
2601 - CONFIG_ENV_MAX_ENTRIES
2603 Maximum number of entries in the hash table that is used
2604 internally to store the environment settings. The default
2605 setting is supposed to be generous and should work in most
2606 cases. This setting can be used to tune behaviour; see
2607 lib/hashtable.c for details.
2609 The following definitions that deal with the placement and management
2610 of environment data (variable area); in general, we support the
2611 following configurations:
2613 - CONFIG_BUILD_ENVCRC:
2615 Builds up envcrc with the target environment so that external utils
2616 may easily extract it and embed it in final U-Boot images.
2618 - CONFIG_ENV_IS_IN_FLASH:
2620 Define this if the environment is in flash memory.
2622 a) The environment occupies one whole flash sector, which is
2623 "embedded" in the text segment with the U-Boot code. This
2624 happens usually with "bottom boot sector" or "top boot
2625 sector" type flash chips, which have several smaller
2626 sectors at the start or the end. For instance, such a
2627 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2628 such a case you would place the environment in one of the
2629 4 kB sectors - with U-Boot code before and after it. With
2630 "top boot sector" type flash chips, you would put the
2631 environment in one of the last sectors, leaving a gap
2632 between U-Boot and the environment.
2634 - CONFIG_ENV_OFFSET:
2636 Offset of environment data (variable area) to the
2637 beginning of flash memory; for instance, with bottom boot
2638 type flash chips the second sector can be used: the offset
2639 for this sector is given here.
2641 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2645 This is just another way to specify the start address of
2646 the flash sector containing the environment (instead of
2649 - CONFIG_ENV_SECT_SIZE:
2651 Size of the sector containing the environment.
2654 b) Sometimes flash chips have few, equal sized, BIG sectors.
2655 In such a case you don't want to spend a whole sector for
2660 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
2661 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2662 of this flash sector for the environment. This saves
2663 memory for the RAM copy of the environment.
2665 It may also save flash memory if you decide to use this
2666 when your environment is "embedded" within U-Boot code,
2667 since then the remainder of the flash sector could be used
2668 for U-Boot code. It should be pointed out that this is
2669 STRONGLY DISCOURAGED from a robustness point of view:
2670 updating the environment in flash makes it always
2671 necessary to erase the WHOLE sector. If something goes
2672 wrong before the contents has been restored from a copy in
2673 RAM, your target system will be dead.
2675 - CONFIG_ENV_ADDR_REDUND
2676 CONFIG_ENV_SIZE_REDUND
2678 These settings describe a second storage area used to hold
2679 a redundant copy of the environment data, so that there is
2680 a valid backup copy in case there is a power failure during
2681 a "saveenv" operation.
2683 BE CAREFUL! Any changes to the flash layout, and some changes to the
2684 source code will make it necessary to adapt <board>/u-boot.lds*
2688 - CONFIG_ENV_IS_IN_NVRAM:
2690 Define this if you have some non-volatile memory device
2691 (NVRAM, battery buffered SRAM) which you want to use for the
2697 These two #defines are used to determine the memory area you
2698 want to use for environment. It is assumed that this memory
2699 can just be read and written to, without any special
2702 BE CAREFUL! The first access to the environment happens quite early
2703 in U-Boot initalization (when we try to get the setting of for the
2704 console baudrate). You *MUST* have mapped your NVRAM area then, or
2707 Please note that even with NVRAM we still use a copy of the
2708 environment in RAM: we could work on NVRAM directly, but we want to
2709 keep settings there always unmodified except somebody uses "saveenv"
2710 to save the current settings.
2713 - CONFIG_ENV_IS_IN_EEPROM:
2715 Use this if you have an EEPROM or similar serial access
2716 device and a driver for it.
2718 - CONFIG_ENV_OFFSET:
2721 These two #defines specify the offset and size of the
2722 environment area within the total memory of your EEPROM.
2724 - CONFIG_SYS_I2C_EEPROM_ADDR:
2725 If defined, specified the chip address of the EEPROM device.
2726 The default address is zero.
2728 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
2729 If defined, the number of bits used to address bytes in a
2730 single page in the EEPROM device. A 64 byte page, for example
2731 would require six bits.
2733 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
2734 If defined, the number of milliseconds to delay between
2735 page writes. The default is zero milliseconds.
2737 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
2738 The length in bytes of the EEPROM memory array address. Note
2739 that this is NOT the chip address length!
2741 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
2742 EEPROM chips that implement "address overflow" are ones
2743 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
2744 address and the extra bits end up in the "chip address" bit
2745 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
2748 Note that we consider the length of the address field to
2749 still be one byte because the extra address bits are hidden
2750 in the chip address.
2752 - CONFIG_SYS_EEPROM_SIZE:
2753 The size in bytes of the EEPROM device.
2755 - CONFIG_ENV_EEPROM_IS_ON_I2C
2756 define this, if you have I2C and SPI activated, and your
2757 EEPROM, which holds the environment, is on the I2C bus.
2759 - CONFIG_I2C_ENV_EEPROM_BUS
2760 if you have an Environment on an EEPROM reached over
2761 I2C muxes, you can define here, how to reach this
2762 EEPROM. For example:
2764 #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0"
2766 EEPROM which holds the environment, is reached over
2767 a pca9547 i2c mux with address 0x70, channel 3.
2769 - CONFIG_ENV_IS_IN_DATAFLASH:
2771 Define this if you have a DataFlash memory device which you
2772 want to use for the environment.
2774 - CONFIG_ENV_OFFSET:
2778 These three #defines specify the offset and size of the
2779 environment area within the total memory of your DataFlash placed
2780 at the specified address.
2782 - CONFIG_ENV_IS_IN_NAND:
2784 Define this if you have a NAND device which you want to use
2785 for the environment.
2787 - CONFIG_ENV_OFFSET:
2790 These two #defines specify the offset and size of the environment
2791 area within the first NAND device. CONFIG_ENV_OFFSET must be
2792 aligned to an erase block boundary.
2794 - CONFIG_ENV_OFFSET_REDUND (optional):
2796 This setting describes a second storage area of CONFIG_ENV_SIZE
2797 size used to hold a redundant copy of the environment data, so
2798 that there is a valid backup copy in case there is a power failure
2799 during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
2800 aligned to an erase block boundary.
2802 - CONFIG_ENV_RANGE (optional):
2804 Specifies the length of the region in which the environment
2805 can be written. This should be a multiple of the NAND device's
2806 block size. Specifying a range with more erase blocks than
2807 are needed to hold CONFIG_ENV_SIZE allows bad blocks within
2808 the range to be avoided.
2810 - CONFIG_ENV_OFFSET_OOB (optional):
2812 Enables support for dynamically retrieving the offset of the
2813 environment from block zero's out-of-band data. The
2814 "nand env.oob" command can be used to record this offset.
2815 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
2816 using CONFIG_ENV_OFFSET_OOB.
2818 - CONFIG_NAND_ENV_DST
2820 Defines address in RAM to which the nand_spl code should copy the
2821 environment. If redundant environment is used, it will be copied to
2822 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
2824 - CONFIG_SYS_SPI_INIT_OFFSET
2826 Defines offset to the initial SPI buffer area in DPRAM. The
2827 area is used at an early stage (ROM part) if the environment
2828 is configured to reside in the SPI EEPROM: We need a 520 byte
2829 scratch DPRAM area. It is used between the two initialization
2830 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2831 to be a good choice since it makes it far enough from the
2832 start of the data area as well as from the stack pointer.
2834 Please note that the environment is read-only until the monitor
2835 has been relocated to RAM and a RAM copy of the environment has been
2836 created; also, when using EEPROM you will have to use getenv_f()
2837 until then to read environment variables.
2839 The environment is protected by a CRC32 checksum. Before the monitor
2840 is relocated into RAM, as a result of a bad CRC you will be working
2841 with the compiled-in default environment - *silently*!!! [This is
2842 necessary, because the first environment variable we need is the
2843 "baudrate" setting for the console - if we have a bad CRC, we don't
2844 have any device yet where we could complain.]
2846 Note: once the monitor has been relocated, then it will complain if
2847 the default environment is used; a new CRC is computed as soon as you
2848 use the "saveenv" command to store a valid environment.
2850 - CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
2851 Echo the inverted Ethernet link state to the fault LED.
2853 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
2854 also needs to be defined.
2856 - CONFIG_SYS_FAULT_MII_ADDR:
2857 MII address of the PHY to check for the Ethernet link state.
2859 - CONFIG_NS16550_MIN_FUNCTIONS:
2860 Define this if you desire to only have use of the NS16550_init
2861 and NS16550_putc functions for the serial driver located at
2862 drivers/serial/ns16550.c. This option is useful for saving
2863 space for already greatly restricted images, including but not
2864 limited to NAND_SPL configurations.
2866 Low Level (hardware related) configuration options:
2867 ---------------------------------------------------
2869 - CONFIG_SYS_CACHELINE_SIZE:
2870 Cache Line Size of the CPU.
2872 - CONFIG_SYS_DEFAULT_IMMR:
2873 Default address of the IMMR after system reset.
2875 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
2876 and RPXsuper) to be able to adjust the position of
2877 the IMMR register after a reset.
2879 - CONFIG_SYS_CCSRBAR_DEFAULT:
2880 Default (power-on reset) physical address of CCSR on Freescale
2883 - CONFIG_SYS_CCSRBAR:
2884 Virtual address of CCSR. On a 32-bit build, this is typically
2885 the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
2887 CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
2888 for cross-platform code that uses that macro instead.
2890 - CONFIG_SYS_CCSRBAR_PHYS:
2891 Physical address of CCSR. CCSR can be relocated to a new
2892 physical address, if desired. In this case, this macro should
2893 be set to that address. Otherwise, it should be set to the
2894 same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
2895 is typically relocated on 36-bit builds. It is recommended
2896 that this macro be defined via the _HIGH and _LOW macros:
2898 #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
2899 * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
2901 - CONFIG_SYS_CCSRBAR_PHYS_HIGH:
2902 Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
2903 either 0 (32-bit build) or 0xF (36-bit build). This macro is
2904 used in assembly code, so it must not contain typecasts or
2905 integer size suffixes (e.g. "ULL").
2907 - CONFIG_SYS_CCSRBAR_PHYS_LOW:
2908 Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
2909 used in assembly code, so it must not contain typecasts or
2910 integer size suffixes (e.g. "ULL").
2912 - CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
2913 If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
2914 forced to a value that ensures that CCSR is not relocated.
2916 - Floppy Disk Support:
2917 CONFIG_SYS_FDC_DRIVE_NUMBER
2919 the default drive number (default value 0)
2921 CONFIG_SYS_ISA_IO_STRIDE
2923 defines the spacing between FDC chipset registers
2926 CONFIG_SYS_ISA_IO_OFFSET
2928 defines the offset of register from address. It
2929 depends on which part of the data bus is connected to
2930 the FDC chipset. (default value 0)
2932 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
2933 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
2936 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
2937 fdc_hw_init() is called at the beginning of the FDC
2938 setup. fdc_hw_init() must be provided by the board
2939 source code. It is used to make hardware dependant
2943 Most IDE controllers were designed to be connected with PCI
2944 interface. Only few of them were designed for AHB interface.
2945 When software is doing ATA command and data transfer to
2946 IDE devices through IDE-AHB controller, some additional
2947 registers accessing to these kind of IDE-AHB controller
2950 - CONFIG_SYS_IMMR: Physical address of the Internal Memory.
2951 DO NOT CHANGE unless you know exactly what you're
2952 doing! (11-4) [MPC8xx/82xx systems only]
2954 - CONFIG_SYS_INIT_RAM_ADDR:
2956 Start address of memory area that can be used for
2957 initial data and stack; please note that this must be
2958 writable memory that is working WITHOUT special
2959 initialization, i. e. you CANNOT use normal RAM which
2960 will become available only after programming the
2961 memory controller and running certain initialization
2964 U-Boot uses the following memory types:
2965 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2966 - MPC824X: data cache
2967 - PPC4xx: data cache
2969 - CONFIG_SYS_GBL_DATA_OFFSET:
2971 Offset of the initial data structure in the memory
2972 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
2973 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
2974 data is located at the end of the available space
2975 (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
2976 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
2977 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
2978 CONFIG_SYS_GBL_DATA_OFFSET) downward.
2981 On the MPC824X (or other systems that use the data
2982 cache for initial memory) the address chosen for
2983 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
2984 point to an otherwise UNUSED address space between
2985 the top of RAM and the start of the PCI space.
2987 - CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
2989 - CONFIG_SYS_SYPCR: System Protection Control (11-9)
2991 - CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
2993 - CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
2995 - CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
2997 - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
2999 - CONFIG_SYS_OR_TIMING_SDRAM:
3002 - CONFIG_SYS_MAMR_PTA:
3003 periodic timer for refresh
3005 - CONFIG_SYS_DER: Debug Event Register (37-47)
3007 - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
3008 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
3009 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
3010 CONFIG_SYS_BR1_PRELIM:
3011 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3013 - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
3014 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
3015 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3016 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3018 - CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
3019 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3020 Machine Mode Register and Memory Periodic Timer
3021 Prescaler definitions (SDRAM timing)
3023 - CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3024 enable I2C microcode relocation patch (MPC8xx);
3025 define relocation offset in DPRAM [DSP2]
3027 - CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3028 enable SMC microcode relocation patch (MPC8xx);
3029 define relocation offset in DPRAM [SMC1]
3031 - CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3032 enable SPI microcode relocation patch (MPC8xx);
3033 define relocation offset in DPRAM [SCC4]
3035 - CONFIG_SYS_USE_OSCCLK:
3036 Use OSCM clock mode on MBX8xx board. Be careful,
3037 wrong setting might damage your board. Read
3038 doc/README.MBX before setting this variable!
3040 - CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3041 Offset of the bootmode word in DPRAM used by post
3042 (Power On Self Tests). This definition overrides
3043 #define'd default value in commproc.h resp.
3046 - CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
3047 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
3048 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
3049 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
3050 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
3051 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
3052 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
3053 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3054 Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
3056 - CONFIG_PCI_DISABLE_PCIE:
3057 Disable PCI-Express on systems where it is supported but not
3061 Chip has SRIO or not
3064 Board has SRIO 1 port available
3067 Board has SRIO 2 port available
3069 - CONFIG_SYS_SRIOn_MEM_VIRT:
3070 Virtual Address of SRIO port 'n' memory region
3072 - CONFIG_SYS_SRIOn_MEM_PHYS:
3073 Physical Address of SRIO port 'n' memory region
3075 - CONFIG_SYS_SRIOn_MEM_SIZE:
3076 Size of SRIO port 'n' memory region
3078 - CONFIG_SYS_NDFC_16
3079 Defined to tell the NDFC that the NAND chip is using a
3082 - CONFIG_SYS_NDFC_EBC0_CFG
3083 Sets the EBC0_CFG register for the NDFC. If not defined
3084 a default value will be used.
3087 Get DDR timing information from an I2C EEPROM. Common
3088 with pluggable memory modules such as SODIMMs
3091 I2C address of the SPD EEPROM
3093 - CONFIG_SYS_SPD_BUS_NUM
3094 If SPD EEPROM is on an I2C bus other than the first
3095 one, specify here. Note that the value must resolve
3096 to something your driver can deal with.
3098 - CONFIG_SYS_DDR_RAW_TIMING
3099 Get DDR timing information from other than SPD. Common with
3100 soldered DDR chips onboard without SPD. DDR raw timing
3101 parameters are extracted from datasheet and hard-coded into
3102 header files or board specific files.
3104 - CONFIG_SYS_83XX_DDR_USES_CS0
3105 Only for 83xx systems. If specified, then DDR should
3106 be configured using CS0 and CS1 instead of CS2 and CS3.
3108 - CONFIG_ETHER_ON_FEC[12]
3109 Define to enable FEC[12] on a 8xx series processor.
3111 - CONFIG_FEC[12]_PHY
3112 Define to the hardcoded PHY address which corresponds
3113 to the given FEC; i. e.
3114 #define CONFIG_FEC1_PHY 4
3115 means that the PHY with address 4 is connected to FEC1
3117 When set to -1, means to probe for first available.
3119 - CONFIG_FEC[12]_PHY_NORXERR
3120 The PHY does not have a RXERR line (RMII only).
3121 (so program the FEC to ignore it).
3124 Enable RMII mode for all FECs.
3125 Note that this is a global option, we can't
3126 have one FEC in standard MII mode and another in RMII mode.
3128 - CONFIG_CRC32_VERIFY
3129 Add a verify option to the crc32 command.
3132 => crc32 -v <address> <count> <crc32>
3134 Where address/count indicate a memory area
3135 and crc32 is the correct crc32 which the
3139 Add the "loopw" memory command. This only takes effect if
3140 the memory commands are activated globally (CONFIG_CMD_MEM).
3143 Add the "mdc" and "mwc" memory commands. These are cyclic
3148 This command will print 4 bytes (10,11,12,13) each 500 ms.
3150 => mwc.l 100 12345678 10
3151 This command will write 12345678 to address 100 all 10 ms.
3153 This only takes effect if the memory commands are activated
3154 globally (CONFIG_CMD_MEM).
3156 - CONFIG_SKIP_LOWLEVEL_INIT
3157 [ARM, MIPS only] If this variable is defined, then certain
3158 low level initializations (like setting up the memory
3159 controller) are omitted and/or U-Boot does not
3160 relocate itself into RAM.
3162 Normally this variable MUST NOT be defined. The only
3163 exception is when U-Boot is loaded (to RAM) by some
3164 other boot loader or by a debugger which performs
3165 these initializations itself.
3168 Modifies the behaviour of start.S when compiling a loader
3169 that is executed before the actual U-Boot. E.g. when
3170 compiling a NAND SPL.
3172 - CONFIG_USE_ARCH_MEMCPY
3173 CONFIG_USE_ARCH_MEMSET
3174 If these options are used a optimized version of memcpy/memset will
3175 be used if available. These functions may be faster under some
3176 conditions but may increase the binary size.
3178 Building the Software:
3179 ======================
3181 Building U-Boot has been tested in several native build environments
3182 and in many different cross environments. Of course we cannot support
3183 all possibly existing versions of cross development tools in all
3184 (potentially obsolete) versions. In case of tool chain problems we
3185 recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3186 which is extensively used to build and test U-Boot.
3188 If you are not using a native environment, it is assumed that you
3189 have GNU cross compiling tools available in your path. In this case,
3190 you must set the environment variable CROSS_COMPILE in your shell.
3191 Note that no changes to the Makefile or any other source files are
3192 necessary. For example using the ELDK on a 4xx CPU, please enter:
3194 $ CROSS_COMPILE=ppc_4xx-
3195 $ export CROSS_COMPILE
3197 Note: If you wish to generate Windows versions of the utilities in
3198 the tools directory you can use the MinGW toolchain
3199 (http://www.mingw.org). Set your HOST tools to the MinGW
3200 toolchain and execute 'make tools'. For example:
3202 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
3204 Binaries such as tools/mkimage.exe will be created which can
3205 be executed on computers running Windows.
3207 U-Boot is intended to be simple to build. After installing the
3208 sources you must configure U-Boot for one specific board type. This
3213 where "NAME_config" is the name of one of the existing configu-
3214 rations; see the main Makefile for supported names.
3216 Note: for some board special configuration names may exist; check if
3217 additional information is available from the board vendor; for
3218 instance, the TQM823L systems are available without (standard)
3219 or with LCD support. You can select such additional "features"
3220 when choosing the configuration, i. e.
3223 - will configure for a plain TQM823L, i. e. no LCD support
3225 make TQM823L_LCD_config
3226 - will configure for a TQM823L with U-Boot console on LCD
3231 Finally, type "make all", and you should get some working U-Boot
3232 images ready for download to / installation on your system:
3234 - "u-boot.bin" is a raw binary image
3235 - "u-boot" is an image in ELF binary format
3236 - "u-boot.srec" is in Motorola S-Record format
3238 By default the build is performed locally and the objects are saved
3239 in the source directory. One of the two methods can be used to change
3240 this behavior and build U-Boot to some external directory:
3242 1. Add O= to the make command line invocations:
3244 make O=/tmp/build distclean
3245 make O=/tmp/build NAME_config
3246 make O=/tmp/build all
3248 2. Set environment variable BUILD_DIR to point to the desired location:
3250 export BUILD_DIR=/tmp/build
3255 Note that the command line "O=" setting overrides the BUILD_DIR environment
3259 Please be aware that the Makefiles assume you are using GNU make, so
3260 for instance on NetBSD you might need to use "gmake" instead of
3264 If the system board that you have is not listed, then you will need
3265 to port U-Boot to your hardware platform. To do this, follow these
3268 1. Add a new configuration option for your board to the toplevel
3269 "Makefile" and to the "MAKEALL" script, using the existing
3270 entries as examples. Note that here and at many other places
3271 boards and other names are listed in alphabetical sort order. Please
3273 2. Create a new directory to hold your board specific code. Add any
3274 files you need. In your board directory, you will need at least
3275 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
3276 3. Create a new configuration file "include/configs/<board>.h" for
3278 3. If you're porting U-Boot to a new CPU, then also create a new
3279 directory to hold your CPU specific code. Add any files you need.
3280 4. Run "make <board>_config" with your new name.
3281 5. Type "make", and you should get a working "u-boot.srec" file
3282 to be installed on your target system.
3283 6. Debug and solve any problems that might arise.
3284 [Of course, this last step is much harder than it sounds.]
3287 Testing of U-Boot Modifications, Ports to New Hardware, etc.:
3288 ==============================================================
3290 If you have modified U-Boot sources (for instance added a new board
3291 or support for new devices, a new CPU, etc.) you are expected to
3292 provide feedback to the other developers. The feedback normally takes
3293 the form of a "patch", i. e. a context diff against a certain (latest
3294 official or latest in the git repository) version of U-Boot sources.
3296 But before you submit such a patch, please verify that your modifi-
3297 cation did not break existing code. At least make sure that *ALL* of
3298 the supported boards compile WITHOUT ANY compiler warnings. To do so,
3299 just run the "MAKEALL" script, which will configure and build U-Boot
3300 for ALL supported system. Be warned, this will take a while. You can
3301 select which (cross) compiler to use by passing a `CROSS_COMPILE'
3302 environment variable to the script, i. e. to use the ELDK cross tools
3305 CROSS_COMPILE=ppc_8xx- MAKEALL
3307 or to build on a native PowerPC system you can type
3309 CROSS_COMPILE=' ' MAKEALL
3311 When using the MAKEALL script, the default behaviour is to build
3312 U-Boot in the source directory. This location can be changed by
3313 setting the BUILD_DIR environment variable. Also, for each target
3314 built, the MAKEALL script saves two log files (<target>.ERR and
3315 <target>.MAKEALL) in the <source dir>/LOG directory. This default
3316 location can be changed by setting the MAKEALL_LOGDIR environment
3317 variable. For example:
3319 export BUILD_DIR=/tmp/build
3320 export MAKEALL_LOGDIR=/tmp/log
3321 CROSS_COMPILE=ppc_8xx- MAKEALL
3323 With the above settings build objects are saved in the /tmp/build,
3324 log files are saved in the /tmp/log and the source tree remains clean
3325 during the whole build process.
3328 See also "U-Boot Porting Guide" below.
3331 Monitor Commands - Overview:
3332 ============================
3334 go - start application at address 'addr'
3335 run - run commands in an environment variable
3336 bootm - boot application image from memory
3337 bootp - boot image via network using BootP/TFTP protocol
3338 tftpboot- boot image via network using TFTP protocol
3339 and env variables "ipaddr" and "serverip"
3340 (and eventually "gatewayip")
3341 rarpboot- boot image via network using RARP/TFTP protocol
3342 diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
3343 loads - load S-Record file over serial line
3344 loadb - load binary file over serial line (kermit mode)
3346 mm - memory modify (auto-incrementing)
3347 nm - memory modify (constant address)
3348 mw - memory write (fill)
3350 cmp - memory compare
3351 crc32 - checksum calculation
3352 i2c - I2C sub-system
3353 sspi - SPI utility commands
3354 base - print or set address offset
3355 printenv- print environment variables
3356 setenv - set environment variables
3357 saveenv - save environment variables to persistent storage
3358 protect - enable or disable FLASH write protection
3359 erase - erase FLASH memory
3360 flinfo - print FLASH memory information
3361 bdinfo - print Board Info structure
3362 iminfo - print header information for application image
3363 coninfo - print console devices and informations
3364 ide - IDE sub-system
3365 loop - infinite loop on address range
3366 loopw - infinite write loop on address range
3367 mtest - simple RAM test
3368 icache - enable or disable instruction cache
3369 dcache - enable or disable data cache
3370 reset - Perform RESET of the CPU
3371 echo - echo args to console
3372 version - print monitor version
3373 help - print online help
3374 ? - alias for 'help'
3377 Monitor Commands - Detailed Description:
3378 ========================================
3382 For now: just type "help <command>".
3385 Environment Variables:
3386 ======================
3388 U-Boot supports user configuration using Environment Variables which
3389 can be made persistent by saving to Flash memory.
3391 Environment Variables are set using "setenv", printed using
3392 "printenv", and saved to Flash using "saveenv". Using "setenv"
3393 without a value can be used to delete a variable from the
3394 environment. As long as you don't save the environment you are
3395 working with an in-memory copy. In case the Flash area containing the
3396 environment is erased by accident, a default environment is provided.
3398 Some configuration options can be set using Environment Variables.
3400 List of environment variables (most likely not complete):
3402 baudrate - see CONFIG_BAUDRATE
3404 bootdelay - see CONFIG_BOOTDELAY
3406 bootcmd - see CONFIG_BOOTCOMMAND
3408 bootargs - Boot arguments when booting an RTOS image
3410 bootfile - Name of the image to load with TFTP
3412 bootm_low - Memory range available for image processing in the bootm
3413 command can be restricted. This variable is given as
3414 a hexadecimal number and defines lowest address allowed
3415 for use by the bootm command. See also "bootm_size"
3416 environment variable. Address defined by "bootm_low" is
3417 also the base of the initial memory mapping for the Linux
3418 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3421 bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3422 This variable is given as a hexadecimal number and it
3423 defines the size of the memory region starting at base
3424 address bootm_low that is accessible by the Linux kernel
3425 during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
3426 as the default value if it is defined, and bootm_size is
3429 bootm_size - Memory range available for image processing in the bootm
3430 command can be restricted. This variable is given as
3431 a hexadecimal number and defines the size of the region
3432 allowed for use by the bootm command. See also "bootm_low"
3433 environment variable.
3435 updatefile - Location of the software update file on a TFTP server, used
3436 by the automatic software update feature. Please refer to
3437 documentation in doc/README.update for more details.
3439 autoload - if set to "no" (any string beginning with 'n'),
3440 "bootp" will just load perform a lookup of the
3441 configuration from the BOOTP server, but not try to
3442 load any image using TFTP
3444 autostart - if set to "yes", an image loaded using the "bootp",
3445 "rarpboot", "tftpboot" or "diskboot" commands will
3446 be automatically started (by internally calling
3449 If set to "no", a standalone image passed to the
3450 "bootm" command will be copied to the load address
3451 (and eventually uncompressed), but NOT be started.
3452 This can be used to load and uncompress arbitrary
3455 fdt_high - if set this restricts the maximum address that the
3456 flattened device tree will be copied into upon boot.
3457 If this is set to the special value 0xFFFFFFFF then
3458 the fdt will not be copied at all on boot. For this
3459 to work it must reside in writable memory, have
3460 sufficient padding on the end of it for u-boot to
3461 add the information it needs into it, and the memory
3462 must be accessible by the kernel.
3464 i2cfast - (PPC405GP|PPC405EP only)
3465 if set to 'y' configures Linux I2C driver for fast
3466 mode (400kHZ). This environment variable is used in
3467 initialization code. So, for changes to be effective
3468 it must be saved and board must be reset.
3470 initrd_high - restrict positioning of initrd images:
3471 If this variable is not set, initrd images will be
3472 copied to the highest possible address in RAM; this
3473 is usually what you want since it allows for
3474 maximum initrd size. If for some reason you want to
3475 make sure that the initrd image is loaded below the
3476 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3477 variable to a value of "no" or "off" or "0".
3478 Alternatively, you can set it to a maximum upper
3479 address to use (U-Boot will still check that it
3480 does not overwrite the U-Boot stack and data).
3482 For instance, when you have a system with 16 MB
3483 RAM, and want to reserve 4 MB from use by Linux,
3484 you can do this by adding "mem=12M" to the value of
3485 the "bootargs" variable. However, now you must make
3486 sure that the initrd image is placed in the first
3487 12 MB as well - this can be done with
3489 setenv initrd_high 00c00000
3491 If you set initrd_high to 0xFFFFFFFF, this is an
3492 indication to U-Boot that all addresses are legal
3493 for the Linux kernel, including addresses in flash
3494 memory. In this case U-Boot will NOT COPY the
3495 ramdisk at all. This may be useful to reduce the
3496 boot time on your system, but requires that this
3497 feature is supported by your Linux kernel.
3499 ipaddr - IP address; needed for tftpboot command
3501 loadaddr - Default load address for commands like "bootp",
3502 "rarpboot", "tftpboot", "loadb" or "diskboot"
3504 loads_echo - see CONFIG_LOADS_ECHO
3506 serverip - TFTP server IP address; needed for tftpboot command
3508 bootretry - see CONFIG_BOOT_RETRY_TIME
3510 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
3512 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
3514 ethprime - controls which interface is used first.
3516 ethact - controls which interface is currently active.
3517 For example you can do the following
3519 => setenv ethact FEC
3520 => ping 192.168.0.1 # traffic sent on FEC
3521 => setenv ethact SCC
3522 => ping 10.0.0.1 # traffic sent on SCC
3524 ethrotate - When set to "no" U-Boot does not go through all
3525 available network interfaces.
3526 It just stays at the currently selected interface.
3528 netretry - When set to "no" each network operation will
3529 either succeed or fail without retrying.
3530 When set to "once" the network operation will
3531 fail when all the available network interfaces
3532 are tried once without success.
3533 Useful on scripts which control the retry operation
3536 npe_ucode - set load address for the NPE microcode
3538 tftpsrcport - If this is set, the value is used for TFTP's
3541 tftpdstport - If this is set, the value is used for TFTP's UDP
3542 destination port instead of the Well Know Port 69.
3544 tftpblocksize - Block size to use for TFTP transfers; if not set,
3545 we use the TFTP server's default block size
3547 tftptimeout - Retransmission timeout for TFTP packets (in milli-
3548 seconds, minimum value is 1000 = 1 second). Defines
3549 when a packet is considered to be lost so it has to
3550 be retransmitted. The default is 5000 = 5 seconds.
3551 Lowering this value may make downloads succeed
3552 faster in networks with high packet loss rates or
3553 with unreliable TFTP servers.
3555 vlan - When set to a value < 4095 the traffic over
3556 Ethernet is encapsulated/received over 802.1q
3559 The following environment variables may be used and automatically
3560 updated by the network boot commands ("bootp" and "rarpboot"),
3561 depending the information provided by your boot server:
3563 bootfile - see above
3564 dnsip - IP address of your Domain Name Server
3565 dnsip2 - IP address of your secondary Domain Name Server
3566 gatewayip - IP address of the Gateway (Router) to use
3567 hostname - Target hostname
3569 netmask - Subnet Mask
3570 rootpath - Pathname of the root filesystem on the NFS server
3571 serverip - see above
3574 There are two special Environment Variables:
3576 serial# - contains hardware identification information such
3577 as type string and/or serial number
3578 ethaddr - Ethernet address
3580 These variables can be set only once (usually during manufacturing of
3581 the board). U-Boot refuses to delete or overwrite these variables
3582 once they have been set once.
3585 Further special Environment Variables:
3587 ver - Contains the U-Boot version string as printed
3588 with the "version" command. This variable is
3589 readonly (see CONFIG_VERSION_VARIABLE).
3592 Please note that changes to some configuration parameters may take
3593 only effect after the next boot (yes, that's just like Windoze :-).
3596 Command Line Parsing:
3597 =====================
3599 There are two different command line parsers available with U-Boot:
3600 the old "simple" one, and the much more powerful "hush" shell:
3602 Old, simple command line parser:
3603 --------------------------------
3605 - supports environment variables (through setenv / saveenv commands)
3606 - several commands on one line, separated by ';'
3607 - variable substitution using "... ${name} ..." syntax
3608 - special characters ('$', ';') can be escaped by prefixing with '\',
3610 setenv bootcmd bootm \${address}
3611 - You can also escape text by enclosing in single apostrophes, for example:
3612 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3617 - similar to Bourne shell, with control structures like
3618 if...then...else...fi, for...do...done; while...do...done,
3619 until...do...done, ...
3620 - supports environment ("global") variables (through setenv / saveenv
3621 commands) and local shell variables (through standard shell syntax
3622 "name=value"); only environment variables can be used with "run"
3628 (1) If a command line (or an environment variable executed by a "run"
3629 command) contains several commands separated by semicolon, and
3630 one of these commands fails, then the remaining commands will be
3633 (2) If you execute several variables with one call to run (i. e.
3634 calling run with a list of variables as arguments), any failing
3635 command will cause "run" to terminate, i. e. the remaining
3636 variables are not executed.
3638 Note for Redundant Ethernet Interfaces:
3639 =======================================
3641 Some boards come with redundant Ethernet interfaces; U-Boot supports
3642 such configurations and is capable of automatic selection of a
3643 "working" interface when needed. MAC assignment works as follows:
3645 Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
3646 MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3647 "eth1addr" (=>eth1), "eth2addr", ...
3649 If the network interface stores some valid MAC address (for instance
3650 in SROM), this is used as default address if there is NO correspon-
3651 ding setting in the environment; if the corresponding environment
3652 variable is set, this overrides the settings in the card; that means:
3654 o If the SROM has a valid MAC address, and there is no address in the
3655 environment, the SROM's address is used.
3657 o If there is no valid address in the SROM, and a definition in the
3658 environment exists, then the value from the environment variable is
3661 o If both the SROM and the environment contain a MAC address, and
3662 both addresses are the same, this MAC address is used.
3664 o If both the SROM and the environment contain a MAC address, and the
3665 addresses differ, the value from the environment is used and a
3668 o If neither SROM nor the environment contain a MAC address, an error
3671 If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
3672 will be programmed into hardware as part of the initialization process. This
3673 may be skipped by setting the appropriate 'ethmacskip' environment variable.
3674 The naming convention is as follows:
3675 "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
3680 U-Boot is capable of booting (and performing other auxiliary operations on)
3681 images in two formats:
3683 New uImage format (FIT)
3684 -----------------------
3686 Flexible and powerful format based on Flattened Image Tree -- FIT (similar
3687 to Flattened Device Tree). It allows the use of images with multiple
3688 components (several kernels, ramdisks, etc.), with contents protected by
3689 SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
3695 Old image format is based on binary files which can be basically anything,
3696 preceded by a special header; see the definitions in include/image.h for
3697 details; basically, the header defines the following image properties:
3699 * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3700 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3701 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3702 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3704 * Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
3705 IA64, MIPS, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
3706 Currently supported: ARM, AVR32, Intel x86, MIPS, Nios II, PowerPC).
3707 * Compression Type (uncompressed, gzip, bzip2)
3713 The header is marked by a special Magic Number, and both the header
3714 and the data portions of the image are secured against corruption by
3721 Although U-Boot should support any OS or standalone application
3722 easily, the main focus has always been on Linux during the design of
3725 U-Boot includes many features that so far have been part of some
3726 special "boot loader" code within the Linux kernel. Also, any
3727 "initrd" images to be used are no longer part of one big Linux image;
3728 instead, kernel and "initrd" are separate images. This implementation
3729 serves several purposes:
3731 - the same features can be used for other OS or standalone
3732 applications (for instance: using compressed images to reduce the
3733 Flash memory footprint)
3735 - it becomes much easier to port new Linux kernel versions because
3736 lots of low-level, hardware dependent stuff are done by U-Boot
3738 - the same Linux kernel image can now be used with different "initrd"
3739 images; of course this also means that different kernel images can
3740 be run with the same "initrd". This makes testing easier (you don't
3741 have to build a new "zImage.initrd" Linux image when you just
3742 change a file in your "initrd"). Also, a field-upgrade of the
3743 software is easier now.
3749 Porting Linux to U-Boot based systems:
3750 ---------------------------------------
3752 U-Boot cannot save you from doing all the necessary modifications to
3753 configure the Linux device drivers for use with your target hardware
3754 (no, we don't intend to provide a full virtual machine interface to
3757 But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
3759 Just make sure your machine specific header file (for instance
3760 include/asm-ppc/tqm8xx.h) includes the same definition of the Board
3761 Information structure as we define in include/asm-<arch>/u-boot.h,
3762 and make sure that your definition of IMAP_ADDR uses the same value
3763 as your U-Boot configuration in CONFIG_SYS_IMMR.
3766 Configuring the Linux kernel:
3767 -----------------------------
3769 No specific requirements for U-Boot. Make sure you have some root
3770 device (initial ramdisk, NFS) for your target system.
3773 Building a Linux Image:
3774 -----------------------
3776 With U-Boot, "normal" build targets like "zImage" or "bzImage" are
3777 not used. If you use recent kernel source, a new build target
3778 "uImage" will exist which automatically builds an image usable by
3779 U-Boot. Most older kernels also have support for a "pImage" target,
3780 which was introduced for our predecessor project PPCBoot and uses a
3781 100% compatible format.
3790 The "uImage" build target uses a special tool (in 'tools/mkimage') to
3791 encapsulate a compressed Linux kernel image with header information,
3792 CRC32 checksum etc. for use with U-Boot. This is what we are doing:
3794 * build a standard "vmlinux" kernel image (in ELF binary format):
3796 * convert the kernel into a raw binary image:
3798 ${CROSS_COMPILE}-objcopy -O binary \
3799 -R .note -R .comment \
3800 -S vmlinux linux.bin
3802 * compress the binary image:
3806 * package compressed binary image for U-Boot:
3808 mkimage -A ppc -O linux -T kernel -C gzip \
3809 -a 0 -e 0 -n "Linux Kernel Image" \
3810 -d linux.bin.gz uImage
3813 The "mkimage" tool can also be used to create ramdisk images for use
3814 with U-Boot, either separated from the Linux kernel image, or
3815 combined into one file. "mkimage" encapsulates the images with a 64
3816 byte header containing information about target architecture,
3817 operating system, image type, compression method, entry points, time
3818 stamp, CRC32 checksums, etc.
3820 "mkimage" can be called in two ways: to verify existing images and
3821 print the header information, or to build new images.
3823 In the first form (with "-l" option) mkimage lists the information
3824 contained in the header of an existing U-Boot image; this includes
3825 checksum verification:
3827 tools/mkimage -l image
3828 -l ==> list image header information
3830 The second form (with "-d" option) is used to build a U-Boot image
3831 from a "data file" which is used as image payload:
3833 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3834 -n name -d data_file image
3835 -A ==> set architecture to 'arch'
3836 -O ==> set operating system to 'os'
3837 -T ==> set image type to 'type'
3838 -C ==> set compression type 'comp'
3839 -a ==> set load address to 'addr' (hex)
3840 -e ==> set entry point to 'ep' (hex)
3841 -n ==> set image name to 'name'
3842 -d ==> use image data from 'datafile'
3844 Right now, all Linux kernels for PowerPC systems use the same load
3845 address (0x00000000), but the entry point address depends on the
3848 - 2.2.x kernels have the entry point at 0x0000000C,
3849 - 2.3.x and later kernels have the entry point at 0x00000000.
3851 So a typical call to build a U-Boot image would read:
3853 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3854 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3855 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
3856 > examples/uImage.TQM850L
3857 Image Name: 2.4.4 kernel for TQM850L
3858 Created: Wed Jul 19 02:34:59 2000
3859 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3860 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3861 Load Address: 0x00000000
3862 Entry Point: 0x00000000
3864 To verify the contents of the image (or check for corruption):
3866 -> tools/mkimage -l examples/uImage.TQM850L
3867 Image Name: 2.4.4 kernel for TQM850L
3868 Created: Wed Jul 19 02:34:59 2000
3869 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3870 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3871 Load Address: 0x00000000
3872 Entry Point: 0x00000000
3874 NOTE: for embedded systems where boot time is critical you can trade
3875 speed for memory and install an UNCOMPRESSED image instead: this
3876 needs more space in Flash, but boots much faster since it does not
3877 need to be uncompressed:
3879 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
3880 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3881 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3882 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
3883 > examples/uImage.TQM850L-uncompressed
3884 Image Name: 2.4.4 kernel for TQM850L
3885 Created: Wed Jul 19 02:34:59 2000
3886 Image Type: PowerPC Linux Kernel Image (uncompressed)
3887 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
3888 Load Address: 0x00000000
3889 Entry Point: 0x00000000
3892 Similar you can build U-Boot images from a 'ramdisk.image.gz' file
3893 when your kernel is intended to use an initial ramdisk:
3895 -> tools/mkimage -n 'Simple Ramdisk Image' \
3896 > -A ppc -O linux -T ramdisk -C gzip \
3897 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3898 Image Name: Simple Ramdisk Image
3899 Created: Wed Jan 12 14:01:50 2000
3900 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3901 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
3902 Load Address: 0x00000000
3903 Entry Point: 0x00000000
3906 Installing a Linux Image:
3907 -------------------------
3909 To downloading a U-Boot image over the serial (console) interface,
3910 you must convert the image to S-Record format:
3912 objcopy -I binary -O srec examples/image examples/image.srec
3914 The 'objcopy' does not understand the information in the U-Boot
3915 image header, so the resulting S-Record file will be relative to
3916 address 0x00000000. To load it to a given address, you need to
3917 specify the target address as 'offset' parameter with the 'loads'
3920 Example: install the image to address 0x40100000 (which on the
3921 TQM8xxL is in the first Flash bank):
3923 => erase 40100000 401FFFFF
3929 ## Ready for S-Record download ...
3930 ~>examples/image.srec
3931 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3933 15989 15990 15991 15992
3934 [file transfer complete]
3936 ## Start Addr = 0x00000000
3939 You can check the success of the download using the 'iminfo' command;
3940 this includes a checksum verification so you can be sure no data
3941 corruption happened:
3945 ## Checking Image at 40100000 ...
3946 Image Name: 2.2.13 for initrd on TQM850L
3947 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3948 Data Size: 335725 Bytes = 327 kB = 0 MB
3949 Load Address: 00000000
3950 Entry Point: 0000000c
3951 Verifying Checksum ... OK
3957 The "bootm" command is used to boot an application that is stored in
3958 memory (RAM or Flash). In case of a Linux kernel image, the contents
3959 of the "bootargs" environment variable is passed to the kernel as
3960 parameters. You can check and modify this variable using the
3961 "printenv" and "setenv" commands:
3964 => printenv bootargs
3965 bootargs=root=/dev/ram
3967 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3969 => printenv bootargs
3970 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3973 ## Booting Linux kernel at 40020000 ...
3974 Image Name: 2.2.13 for NFS on TQM850L
3975 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3976 Data Size: 381681 Bytes = 372 kB = 0 MB
3977 Load Address: 00000000
3978 Entry Point: 0000000c
3979 Verifying Checksum ... OK
3980 Uncompressing Kernel Image ... OK
3981 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
3982 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3983 time_init: decrementer frequency = 187500000/60
3984 Calibrating delay loop... 49.77 BogoMIPS
3985 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3988 If you want to boot a Linux kernel with initial RAM disk, you pass
3989 the memory addresses of both the kernel and the initrd image (PPBCOOT
3990 format!) to the "bootm" command:
3992 => imi 40100000 40200000
3994 ## Checking Image at 40100000 ...
3995 Image Name: 2.2.13 for initrd on TQM850L
3996 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3997 Data Size: 335725 Bytes = 327 kB = 0 MB
3998 Load Address: 00000000
3999 Entry Point: 0000000c
4000 Verifying Checksum ... OK
4002 ## Checking Image at 40200000 ...
4003 Image Name: Simple Ramdisk Image
4004 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4005 Data Size: 566530 Bytes = 553 kB = 0 MB
4006 Load Address: 00000000
4007 Entry Point: 00000000
4008 Verifying Checksum ... OK
4010 => bootm 40100000 40200000
4011 ## Booting Linux kernel at 40100000 ...
4012 Image Name: 2.2.13 for initrd on TQM850L
4013 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4014 Data Size: 335725 Bytes = 327 kB = 0 MB
4015 Load Address: 00000000
4016 Entry Point: 0000000c
4017 Verifying Checksum ... OK
4018 Uncompressing Kernel Image ... OK
4019 ## Loading RAMDisk Image at 40200000 ...
4020 Image Name: Simple Ramdisk Image
4021 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4022 Data Size: 566530 Bytes = 553 kB = 0 MB
4023 Load Address: 00000000
4024 Entry Point: 00000000
4025 Verifying Checksum ... OK
4026 Loading Ramdisk ... OK
4027 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
4028 Boot arguments: root=/dev/ram
4029 time_init: decrementer frequency = 187500000/60
4030 Calibrating delay loop... 49.77 BogoMIPS
4032 RAMDISK: Compressed image found at block 0
4033 VFS: Mounted root (ext2 filesystem).
4037 Boot Linux and pass a flat device tree:
4040 First, U-Boot must be compiled with the appropriate defines. See the section
4041 titled "Linux Kernel Interface" above for a more in depth explanation. The
4042 following is an example of how to start a kernel and pass an updated
4048 oft=oftrees/mpc8540ads.dtb
4049 => tftp $oftaddr $oft
4050 Speed: 1000, full duplex
4052 TFTP from server 192.168.1.1; our IP address is 192.168.1.101
4053 Filename 'oftrees/mpc8540ads.dtb'.
4054 Load address: 0x300000
4057 Bytes transferred = 4106 (100a hex)
4058 => tftp $loadaddr $bootfile
4059 Speed: 1000, full duplex
4061 TFTP from server 192.168.1.1; our IP address is 192.168.1.2
4063 Load address: 0x200000
4064 Loading:############
4066 Bytes transferred = 1029407 (fb51f hex)
4071 => bootm $loadaddr - $oftaddr
4072 ## Booting image at 00200000 ...
4073 Image Name: Linux-2.6.17-dirty
4074 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4075 Data Size: 1029343 Bytes = 1005.2 kB
4076 Load Address: 00000000
4077 Entry Point: 00000000
4078 Verifying Checksum ... OK
4079 Uncompressing Kernel Image ... OK
4080 Booting using flat device tree at 0x300000
4081 Using MPC85xx ADS machine description
4082 Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
4086 More About U-Boot Image Types:
4087 ------------------------------
4089 U-Boot supports the following image types:
4091 "Standalone Programs" are directly runnable in the environment
4092 provided by U-Boot; it is expected that (if they behave
4093 well) you can continue to work in U-Boot after return from
4094 the Standalone Program.
4095 "OS Kernel Images" are usually images of some Embedded OS which
4096 will take over control completely. Usually these programs
4097 will install their own set of exception handlers, device
4098 drivers, set up the MMU, etc. - this means, that you cannot
4099 expect to re-enter U-Boot except by resetting the CPU.
4100 "RAMDisk Images" are more or less just data blocks, and their
4101 parameters (address, size) are passed to an OS kernel that is
4103 "Multi-File Images" contain several images, typically an OS
4104 (Linux) kernel image and one or more data images like
4105 RAMDisks. This construct is useful for instance when you want
4106 to boot over the network using BOOTP etc., where the boot
4107 server provides just a single image file, but you want to get
4108 for instance an OS kernel and a RAMDisk image.
4110 "Multi-File Images" start with a list of image sizes, each
4111 image size (in bytes) specified by an "uint32_t" in network
4112 byte order. This list is terminated by an "(uint32_t)0".
4113 Immediately after the terminating 0 follow the images, one by
4114 one, all aligned on "uint32_t" boundaries (size rounded up to
4115 a multiple of 4 bytes).
4117 "Firmware Images" are binary images containing firmware (like
4118 U-Boot or FPGA images) which usually will be programmed to
4121 "Script files" are command sequences that will be executed by
4122 U-Boot's command interpreter; this feature is especially
4123 useful when you configure U-Boot to use a real shell (hush)
4124 as command interpreter.
4130 One of the features of U-Boot is that you can dynamically load and
4131 run "standalone" applications, which can use some resources of
4132 U-Boot like console I/O functions or interrupt services.
4134 Two simple examples are included with the sources:
4139 'examples/hello_world.c' contains a small "Hello World" Demo
4140 application; it is automatically compiled when you build U-Boot.
4141 It's configured to run at address 0x00040004, so you can play with it
4145 ## Ready for S-Record download ...
4146 ~>examples/hello_world.srec
4147 1 2 3 4 5 6 7 8 9 10 11 ...
4148 [file transfer complete]
4150 ## Start Addr = 0x00040004
4152 => go 40004 Hello World! This is a test.
4153 ## Starting application at 0x00040004 ...
4164 Hit any key to exit ...
4166 ## Application terminated, rc = 0x0
4168 Another example, which demonstrates how to register a CPM interrupt
4169 handler with the U-Boot code, can be found in 'examples/timer.c'.
4170 Here, a CPM timer is set up to generate an interrupt every second.
4171 The interrupt service routine is trivial, just printing a '.'
4172 character, but this is just a demo program. The application can be
4173 controlled by the following keys:
4175 ? - print current values og the CPM Timer registers
4176 b - enable interrupts and start timer
4177 e - stop timer and disable interrupts
4178 q - quit application
4181 ## Ready for S-Record download ...
4182 ~>examples/timer.srec
4183 1 2 3 4 5 6 7 8 9 10 11 ...
4184 [file transfer complete]
4186 ## Start Addr = 0x00040004
4189 ## Starting application at 0x00040004 ...
4192 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4195 [q, b, e, ?] Set interval 1000000 us
4198 [q, b, e, ?] ........
4199 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4202 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4205 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4208 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4210 [q, b, e, ?] ...Stopping timer
4212 [q, b, e, ?] ## Application terminated, rc = 0x0
4218 Over time, many people have reported problems when trying to use the
4219 "minicom" terminal emulation program for serial download. I (wd)
4220 consider minicom to be broken, and recommend not to use it. Under
4221 Unix, I recommend to use C-Kermit for general purpose use (and
4222 especially for kermit binary protocol download ("loadb" command), and
4223 use "cu" for S-Record download ("loads" command).
4225 Nevertheless, if you absolutely want to use it try adding this
4226 configuration to your "File transfer protocols" section:
4228 Name Program Name U/D FullScr IO-Red. Multi
4229 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
4230 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
4236 Starting at version 0.9.2, U-Boot supports NetBSD both as host
4237 (build U-Boot) and target system (boots NetBSD/mpc8xx).
4239 Building requires a cross environment; it is known to work on
4240 NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4241 need gmake since the Makefiles are not compatible with BSD make).
4242 Note that the cross-powerpc package does not install include files;
4243 attempting to build U-Boot will fail because <machine/ansi.h> is
4244 missing. This file has to be installed and patched manually:
4246 # cd /usr/pkg/cross/powerpc-netbsd/include
4248 # ln -s powerpc machine
4249 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4250 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
4252 Native builds *don't* work due to incompatibilities between native
4253 and U-Boot include files.
4255 Booting assumes that (the first part of) the image booted is a
4256 stage-2 loader which in turn loads and then invokes the kernel
4257 proper. Loader sources will eventually appear in the NetBSD source
4258 tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
4259 meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4262 Implementation Internals:
4263 =========================
4265 The following is not intended to be a complete description of every
4266 implementation detail. However, it should help to understand the
4267 inner workings of U-Boot and make it easier to port it to custom
4271 Initial Stack, Global Data:
4272 ---------------------------
4274 The implementation of U-Boot is complicated by the fact that U-Boot
4275 starts running out of ROM (flash memory), usually without access to
4276 system RAM (because the memory controller is not initialized yet).
4277 This means that we don't have writable Data or BSS segments, and BSS
4278 is not initialized as zero. To be able to get a C environment working
4279 at all, we have to allocate at least a minimal stack. Implementation
4280 options for this are defined and restricted by the CPU used: Some CPU
4281 models provide on-chip memory (like the IMMR area on MPC8xx and
4282 MPC826x processors), on others (parts of) the data cache can be
4283 locked as (mis-) used as memory, etc.
4285 Chris Hallinan posted a good summary of these issues to the
4286 U-Boot mailing list:
4288 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
4289 From: "Chris Hallinan" <clh@net1plus.com>
4290 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
4293 Correct me if I'm wrong, folks, but the way I understand it
4294 is this: Using DCACHE as initial RAM for Stack, etc, does not
4295 require any physical RAM backing up the cache. The cleverness
4296 is that the cache is being used as a temporary supply of
4297 necessary storage before the SDRAM controller is setup. It's
4298 beyond the scope of this list to explain the details, but you
4299 can see how this works by studying the cache architecture and
4300 operation in the architecture and processor-specific manuals.
4302 OCM is On Chip Memory, which I believe the 405GP has 4K. It
4303 is another option for the system designer to use as an
4304 initial stack/RAM area prior to SDRAM being available. Either
4305 option should work for you. Using CS 4 should be fine if your
4306 board designers haven't used it for something that would
4307 cause you grief during the initial boot! It is frequently not
4310 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
4311 with your processor/board/system design. The default value
4312 you will find in any recent u-boot distribution in
4313 walnut.h should work for you. I'd set it to a value larger
4314 than your SDRAM module. If you have a 64MB SDRAM module, set
4315 it above 400_0000. Just make sure your board has no resources
4316 that are supposed to respond to that address! That code in
4317 start.S has been around a while and should work as is when
4318 you get the config right.
4323 It is essential to remember this, since it has some impact on the C
4324 code for the initialization procedures:
4326 * Initialized global data (data segment) is read-only. Do not attempt
4329 * Do not use any uninitialized global data (or implicitely initialized
4330 as zero data - BSS segment) at all - this is undefined, initiali-
4331 zation is performed later (when relocating to RAM).
4333 * Stack space is very limited. Avoid big data buffers or things like
4336 Having only the stack as writable memory limits means we cannot use
4337 normal global data to share information beween the code. But it
4338 turned out that the implementation of U-Boot can be greatly
4339 simplified by making a global data structure (gd_t) available to all
4340 functions. We could pass a pointer to this data as argument to _all_
4341 functions, but this would bloat the code. Instead we use a feature of
4342 the GCC compiler (Global Register Variables) to share the data: we
4343 place a pointer (gd) to the global data into a register which we
4344 reserve for this purpose.
4346 When choosing a register for such a purpose we are restricted by the
4347 relevant (E)ABI specifications for the current architecture, and by
4348 GCC's implementation.
4350 For PowerPC, the following registers have specific use:
4352 R2: reserved for system use
4353 R3-R4: parameter passing and return values
4354 R5-R10: parameter passing
4355 R13: small data area pointer
4359 (U-Boot also uses R12 as internal GOT pointer. r12
4360 is a volatile register so r12 needs to be reset when
4361 going back and forth between asm and C)
4363 ==> U-Boot will use R2 to hold a pointer to the global data
4365 Note: on PPC, we could use a static initializer (since the
4366 address of the global data structure is known at compile time),
4367 but it turned out that reserving a register results in somewhat
4368 smaller code - although the code savings are not that big (on
4369 average for all boards 752 bytes for the whole U-Boot image,
4370 624 text + 127 data).
4372 On Blackfin, the normal C ABI (except for P3) is followed as documented here:
4373 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
4375 ==> U-Boot will use P3 to hold a pointer to the global data
4377 On ARM, the following registers are used:
4379 R0: function argument word/integer result
4380 R1-R3: function argument word
4382 R10: stack limit (used only if stack checking if enabled)
4383 R11: argument (frame) pointer
4384 R12: temporary workspace
4387 R15: program counter
4389 ==> U-Boot will use R8 to hold a pointer to the global data
4391 On Nios II, the ABI is documented here:
4392 http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
4394 ==> U-Boot will use gp to hold a pointer to the global data
4396 Note: on Nios II, we give "-G0" option to gcc and don't use gp
4397 to access small data sections, so gp is free.
4399 NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4400 or current versions of GCC may "optimize" the code too much.
4405 U-Boot runs in system state and uses physical addresses, i.e. the
4406 MMU is not used either for address mapping nor for memory protection.
4408 The available memory is mapped to fixed addresses using the memory
4409 controller. In this process, a contiguous block is formed for each
4410 memory type (Flash, SDRAM, SRAM), even when it consists of several
4411 physical memory banks.
4413 U-Boot is installed in the first 128 kB of the first Flash bank (on
4414 TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4415 booting and sizing and initializing DRAM, the code relocates itself
4416 to the upper end of DRAM. Immediately below the U-Boot code some
4417 memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4418 configuration setting]. Below that, a structure with global Board
4419 Info data is placed, followed by the stack (growing downward).
4421 Additionally, some exception handler code is copied to the low 8 kB
4422 of DRAM (0x00000000 ... 0x00001FFF).
4424 So a typical memory configuration with 16 MB of DRAM could look like
4427 0x0000 0000 Exception Vector code
4430 0x0000 2000 Free for Application Use
4436 0x00FB FF20 Monitor Stack (Growing downward)
4437 0x00FB FFAC Board Info Data and permanent copy of global data
4438 0x00FC 0000 Malloc Arena
4441 0x00FE 0000 RAM Copy of Monitor Code
4442 ... eventually: LCD or video framebuffer
4443 ... eventually: pRAM (Protected RAM - unchanged by reset)
4444 0x00FF FFFF [End of RAM]
4447 System Initialization:
4448 ----------------------
4450 In the reset configuration, U-Boot starts at the reset entry point
4451 (on most PowerPC systems at address 0x00000100). Because of the reset
4452 configuration for CS0# this is a mirror of the onboard Flash memory.
4453 To be able to re-map memory U-Boot then jumps to its link address.
4454 To be able to implement the initialization code in C, a (small!)
4455 initial stack is set up in the internal Dual Ported RAM (in case CPUs
4456 which provide such a feature like MPC8xx or MPC8260), or in a locked
4457 part of the data cache. After that, U-Boot initializes the CPU core,
4458 the caches and the SIU.
4460 Next, all (potentially) available memory banks are mapped using a
4461 preliminary mapping. For example, we put them on 512 MB boundaries
4462 (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4463 on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4464 programmed for SDRAM access. Using the temporary configuration, a
4465 simple memory test is run that determines the size of the SDRAM
4468 When there is more than one SDRAM bank, and the banks are of
4469 different size, the largest is mapped first. For equal size, the first
4470 bank (CS2#) is mapped first. The first mapping is always for address
4471 0x00000000, with any additional banks following immediately to create
4472 contiguous memory starting from 0.
4474 Then, the monitor installs itself at the upper end of the SDRAM area
4475 and allocates memory for use by malloc() and for the global Board
4476 Info data; also, the exception vector code is copied to the low RAM
4477 pages, and the final stack is set up.
4479 Only after this relocation will you have a "normal" C environment;
4480 until that you are restricted in several ways, mostly because you are
4481 running from ROM, and because the code will have to be relocated to a
4485 U-Boot Porting Guide:
4486 ----------------------
4488 [Based on messages by Jerry Van Baren in the U-Boot-Users mailing
4492 int main(int argc, char *argv[])
4494 sighandler_t no_more_time;
4496 signal(SIGALRM, no_more_time);
4497 alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4499 if (available_money > available_manpower) {
4500 Pay consultant to port U-Boot;
4504 Download latest U-Boot source;
4506 Subscribe to u-boot mailing list;
4509 email("Hi, I am new to U-Boot, how do I get started?");
4512 Read the README file in the top level directory;
4513 Read http://www.denx.de/twiki/bin/view/DULG/Manual;
4514 Read applicable doc/*.README;
4515 Read the source, Luke;
4516 /* find . -name "*.[chS]" | xargs grep -i <keyword> */
4519 if (available_money > toLocalCurrency ($2500))
4522 Add a lot of aggravation and time;
4524 if (a similar board exists) { /* hopefully... */
4525 cp -a board/<similar> board/<myboard>
4526 cp include/configs/<similar>.h include/configs/<myboard>.h
4528 Create your own board support subdirectory;
4529 Create your own board include/configs/<myboard>.h file;
4531 Edit new board/<myboard> files
4532 Edit new include/configs/<myboard>.h
4537 Add / modify source code;
4541 email("Hi, I am having problems...");
4543 Send patch file to the U-Boot email list;
4544 if (reasonable critiques)
4545 Incorporate improvements from email list code review;
4547 Defend code as written;
4553 void no_more_time (int sig)
4562 All contributions to U-Boot should conform to the Linux kernel
4563 coding style; see the file "Documentation/CodingStyle" and the script
4564 "scripts/Lindent" in your Linux kernel source directory.
4566 Source files originating from a different project (for example the
4567 MTD subsystem) are generally exempt from these guidelines and are not
4568 reformated to ease subsequent migration to newer versions of those
4571 Please note that U-Boot is implemented in C (and to some small parts in
4572 Assembler); no C++ is used, so please do not use C++ style comments (//)
4575 Please also stick to the following formatting rules:
4576 - remove any trailing white space
4577 - use TAB characters for indentation and vertical alignment, not spaces
4578 - make sure NOT to use DOS '\r\n' line feeds
4579 - do not add more than 2 consecutive empty lines to source files
4580 - do not add trailing empty lines to source files
4582 Submissions which do not conform to the standards may be returned
4583 with a request to reformat the changes.
4589 Since the number of patches for U-Boot is growing, we need to
4590 establish some rules. Submissions which do not conform to these rules
4591 may be rejected, even when they contain important and valuable stuff.
4593 Please see http://www.denx.de/wiki/U-Boot/Patches for details.
4595 Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
4596 see http://lists.denx.de/mailman/listinfo/u-boot
4598 When you send a patch, please include the following information with
4601 * For bug fixes: a description of the bug and how your patch fixes
4602 this bug. Please try to include a way of demonstrating that the
4603 patch actually fixes something.
4605 * For new features: a description of the feature and your
4608 * A CHANGELOG entry as plaintext (separate from the patch)
4610 * For major contributions, your entry to the CREDITS file
4612 * When you add support for a new board, don't forget to add this
4613 board to the MAINTAINERS file, too.
4615 * If your patch adds new configuration options, don't forget to
4616 document these in the README file.
4618 * The patch itself. If you are using git (which is *strongly*
4619 recommended) you can easily generate the patch using the
4620 "git format-patch". If you then use "git send-email" to send it to
4621 the U-Boot mailing list, you will avoid most of the common problems
4622 with some other mail clients.
4624 If you cannot use git, use "diff -purN OLD NEW". If your version of
4625 diff does not support these options, then get the latest version of
4628 The current directory when running this command shall be the parent
4629 directory of the U-Boot source tree (i. e. please make sure that
4630 your patch includes sufficient directory information for the
4633 We prefer patches as plain text. MIME attachments are discouraged,
4634 and compressed attachments must not be used.
4636 * If one logical set of modifications affects or creates several
4637 files, all these changes shall be submitted in a SINGLE patch file.
4639 * Changesets that contain different, unrelated modifications shall be
4640 submitted as SEPARATE patches, one patch per changeset.
4645 * Before sending the patch, run the MAKEALL script on your patched
4646 source tree and make sure that no errors or warnings are reported
4647 for any of the boards.
4649 * Keep your modifications to the necessary minimum: A patch
4650 containing several unrelated changes or arbitrary reformats will be
4651 returned with a request to re-formatting / split it.
4653 * If you modify existing code, make sure that your new code does not
4654 add to the memory footprint of the code ;-) Small is beautiful!
4655 When adding new features, these should compile conditionally only
4656 (using #ifdef), and the resulting code with the new feature
4657 disabled must not need more memory than the old code without your
4660 * Remember that there is a size limit of 100 kB per message on the
4661 u-boot mailing list. Bigger patches will be moderated. If they are
4662 reasonable and not too big, they will be acknowledged. But patches
4663 bigger than the size limit should be avoided.
projects / platform / kernel / u-boot.git / blob