/cpu CPU specific files
/arm720t Files specific to ARM 720 CPUs
/arm920t Files specific to ARM 920 CPUs
- /at91rm9200 Files specific to Atmel AT91RM9200 CPU
+ /at91 Files specific to Atmel AT91RM9200 CPU
/imx Files specific to Freescale MC9328 i.MX CPUs
/s3c24x0 Files specific to Samsung S3C24X0 CPUs
/arm925t Files specific to ARM 925 CPUs
/lib Architecture specific library files
/mips Files generic to MIPS architecture
/cpu CPU specific files
+ /mips32 Files specific to MIPS32 CPUs
/lib Architecture specific library files
/nios2 Files generic to Altera NIOS2 architecture
/cpu CPU specific files
2. The core frequency as calculated above is multiplied
by this value.
+- MIPS CPU options:
+ CONFIG_SYS_INIT_SP_OFFSET
+
+ Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
+ pointer. This is needed for the temporary stack before
+ relocation.
+
+ CONFIG_SYS_MIPS_CACHE_MODE
+
+ Cache operation mode for the MIPS CPU.
+ See also arch/mips/include/asm/mipsregs.h.
+ Possible values are:
+ CONF_CM_CACHABLE_NO_WA
+ CONF_CM_CACHABLE_WA
+ CONF_CM_UNCACHED
+ CONF_CM_CACHABLE_NONCOHERENT
+ CONF_CM_CACHABLE_CE
+ CONF_CM_CACHABLE_COW
+ CONF_CM_CACHABLE_CUW
+ CONF_CM_CACHABLE_ACCELERATED
+
+ CONFIG_SYS_XWAY_EBU_BOOTCFG
+
+ Special option for Lantiq XWAY SoCs for booting from NOR flash.
+ See also arch/mips/cpu/mips32/start.S.
+
+ CONFIG_XWAY_SWAP_BYTES
+
+ Enable compilation of tools/xway-swap-bytes needed for Lantiq
+ XWAY SoCs for booting from NOR flash. The U-Boot image needs to
+ be swapped if a flash programmer is used.
+
- Linux Kernel Interface:
CONFIG_CLOCKS_IN_MHZ
must be defined, to setup the maximum idle timeout for
the SMC.
+- Pre-Console Buffer:
+ Prior to the console being initialised (i.e. serial UART
+ initialised etc) all console output is silently discarded.
+ Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
+ buffer any console messages prior to the console being
+ initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
+ bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
+ a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
+ bytes are output before the console is initialised, the
+ earlier bytes are discarded.
+
+ 'Sane' compilers will generate smaller code if
+ CONFIG_PRE_CON_BUF_SZ is a power of 2
+
- Boot Delay: CONFIG_BOOTDELAY - in seconds
Delay before automatically booting the default image;
set to -1 to disable autoboot.
or CONFIG_VIDEO_SED13806_16BPP
CONFIG_FSL_DIU_FB
- Enable the Freescale DIU video driver. Reference boards for
+ Enable the Freescale DIU video driver. Reference boards for
SOCs that have a DIU should define this macro to enable DIU
support, and should also define these other macros:
=>
If you now switch to the new I2C Bus 3 with "i2c dev 3"
- u-boot sends First the Commando to the mux@70 to enable
- channel 6, and then the Commando to the mux@71 to enable
+ u-boot first sends the command to the mux@70 to enable
+ channel 6, and then the command to the mux@71 to enable
the channel 4.
After that, you can use the "normal" i2c commands as
- usual, to communicate with your I2C devices behind
+ usual to communicate with your I2C devices behind
the 2 muxes.
This option is actually implemented for the bitbanging
example, some LED's) on your board. At the moment,
the following checkpoints are implemented:
-- Standalone program support:
- CONFIG_STANDALONE_LOAD_ADDR
-
- This option allows to define board specific values
- for the address where standalone program gets loaded,
- thus overwriting the architecutre dependent default
- settings.
-
-- Frame Buffer Address:
- CONFIG_FB_ADDR
-
- Define CONFIG_FB_ADDR if you want to use specific address for
- frame buffer.
- Then system will reserve the frame buffer address to defined address
- instead of lcd_setmem (this function grab the memory for frame buffer
- by panel's size).
-
- Please see board_init_f function.
-
- If you want this config option then,
- please define it at your board config file
-
Legacy uImage format:
Arg Where When
-150 common/cmd_nand.c Incorrect FIT image format
151 common/cmd_nand.c FIT image format OK
+- Standalone program support:
+ CONFIG_STANDALONE_LOAD_ADDR
+
+ This option allows to define board specific values
+ for the address where standalone program gets loaded,
+ thus overwriting the architecutre dependent default
+ settings.
+
+- Frame Buffer Address:
+ CONFIG_FB_ADDR
+
+ Define CONFIG_FB_ADDR if you want to use specific
+ address for frame buffer.
+ Then system will reserve the frame buffer address to
+ defined address instead of lcd_setmem (this function
+ grab the memory for frame buffer by panel's size).
+
+ Please see board_init_f function.
+
+ If you want this config option then,
+ please define it at your board config file
+
- Automatic software updates via TFTP server
CONFIG_UPDATE_TFTP
CONFIG_UPDATE_TFTP_CNT_MAX
kernel. Needed for UBI support.
- SPL framework
- CONFIG_SPL
- Enable building of SPL globally.
+ CONFIG_SPL
+ Enable building of SPL globally.
- CONFIG_SPL_TEXT_BASE
- TEXT_BASE for linking the SPL binary.
+ CONFIG_SPL_TEXT_BASE
+ TEXT_BASE for linking the SPL binary.
- CONFIG_SPL_LDSCRIPT
- LDSCRIPT for linking the SPL binary.
+ CONFIG_SPL_LDSCRIPT
+ LDSCRIPT for linking the SPL binary.
- CONFIG_SPL_LIBCOMMON_SUPPORT
- Support for common/libcommon.o in SPL binary
+ CONFIG_SPL_LIBCOMMON_SUPPORT
+ Support for common/libcommon.o in SPL binary
- CONFIG_SPL_LIBDISK_SUPPORT
- Support for disk/libdisk.o in SPL binary
+ CONFIG_SPL_LIBDISK_SUPPORT
+ Support for disk/libdisk.o in SPL binary
- CONFIG_SPL_I2C_SUPPORT
- Support for drivers/i2c/libi2c.o in SPL binary
+ CONFIG_SPL_I2C_SUPPORT
+ Support for drivers/i2c/libi2c.o in SPL binary
- CONFIG_SPL_GPIO_SUPPORT
- Support for drivers/gpio/libgpio.o in SPL binary
+ CONFIG_SPL_GPIO_SUPPORT
+ Support for drivers/gpio/libgpio.o in SPL binary
- CONFIG_SPL_MMC_SUPPORT
- Support for drivers/mmc/libmmc.o in SPL binary
+ CONFIG_SPL_MMC_SUPPORT
+ Support for drivers/mmc/libmmc.o in SPL binary
- CONFIG_SPL_SERIAL_SUPPORT
- Support for drivers/serial/libserial.o in SPL binary
+ CONFIG_SPL_SERIAL_SUPPORT
+ Support for drivers/serial/libserial.o in SPL binary
- CONFIG_SPL_SPI_FLASH_SUPPORT
- Support for drivers/mtd/spi/libspi_flash.o in SPL binary
+ CONFIG_SPL_SPI_FLASH_SUPPORT
+ Support for drivers/mtd/spi/libspi_flash.o in SPL binary
- CONFIG_SPL_SPI_SUPPORT
- Support for drivers/spi/libspi.o in SPL binary
+ CONFIG_SPL_SPI_SUPPORT
+ Support for drivers/spi/libspi.o in SPL binary
- CONFIG_SPL_FAT_SUPPORT
- Support for fs/fat/libfat.o in SPL binary
+ CONFIG_SPL_FAT_SUPPORT
+ Support for fs/fat/libfat.o in SPL binary
- CONFIG_SPL_LIBGENERIC_SUPPORT
- Support for lib/libgeneric.o in SPL binary
+ CONFIG_SPL_LIBGENERIC_SUPPORT
+ Support for lib/libgeneric.o in SPL binary
Modem Support:
--------------
of environment data (variable area); in general, we support the
following configurations:
+- CONFIG_BUILD_ENVCRC:
+
+ Builds up envcrc with the target environment so that external utils
+ may easily extract it and embed it in final U-Boot images.
+
- CONFIG_ENV_IS_IN_FLASH:
Define this if the environment is in flash memory.
and RPXsuper) to be able to adjust the position of
the IMMR register after a reset.
+- CONFIG_SYS_CCSRBAR_DEFAULT:
+ Default (power-on reset) physical address of CCSR on Freescale
+ PowerPC SOCs.
+
+- CONFIG_SYS_CCSRBAR:
+ Virtual address of CCSR. On a 32-bit build, this is typically
+ the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
+
+ CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
+ for cross-platform code that uses that macro instead.
+
+- CONFIG_SYS_CCSRBAR_PHYS:
+ Physical address of CCSR. CCSR can be relocated to a new
+ physical address, if desired. In this case, this macro should
+ be set to that address. Otherwise, it should be set to the
+ same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
+ is typically relocated on 36-bit builds. It is recommended
+ that this macro be defined via the _HIGH and _LOW macros:
+
+ #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
+ * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
+
+- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
+ Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
+ either 0 (32-bit build) or 0xF (36-bit build). This macro is
+ used in assembly code, so it must not contain typecasts or
+ integer size suffixes (e.g. "ULL").
+
+- CONFIG_SYS_CCSRBAR_PHYS_LOW:
+ Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
+ used in assembly code, so it must not contain typecasts or
+ integer size suffixes (e.g. "ULL").
+
+- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
+ If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
+ forced to a value that ensures that CCSR is not relocated.
+
- Floppy Disk Support:
CONFIG_SYS_FDC_DRIVE_NUMBER
globally (CONFIG_CMD_MEM).
- CONFIG_SKIP_LOWLEVEL_INIT
- [ARM only] If this variable is defined, then certain
+ [ARM, MIPS only] If this variable is defined, then certain
low level initializations (like setting up the memory
controller) are omitted and/or U-Boot does not
relocate itself into RAM.
bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
- ethprime - When CONFIG_NET_MULTI is enabled controls which
- interface is used first.
+ ethprime - controls which interface is used first.
- ethact - When CONFIG_NET_MULTI is enabled controls which
- interface is currently active. For example you
- can do the following
+ ethact - controls which interface is currently active.
+ For example you can do the following
=> setenv ethact FEC
=> ping 192.168.0.1 # traffic sent on FEC
All contributions to U-Boot should conform to the Linux kernel
coding style; see the file "Documentation/CodingStyle" and the script
-"scripts/Lindent" in your Linux kernel source directory. In sources
-originating from U-Boot a style corresponding to "Lindent -pcs" (adding
-spaces before parameters to function calls) is actually used.
+"scripts/Lindent" in your Linux kernel source directory.
Source files originating from a different project (for example the
MTD subsystem) are generally exempt from these guidelines and are not
Please also stick to the following formatting rules:
- remove any trailing white space
-- use TAB characters for indentation, not spaces
+- use TAB characters for indentation and vertical alignment, not spaces
- make sure NOT to use DOS '\r\n' line feeds
-- do not add more than 2 empty lines to source files
+- do not add more than 2 consecutive empty lines to source files
- do not add trailing empty lines to source files
Submissions which do not conform to the standards may be returned
* For major contributions, your entry to the CREDITS file
* When you add support for a new board, don't forget to add this
- board to the MAKEALL script, too.
+ board to the MAINTAINERS file, too.
* If your patch adds new configuration options, don't forget to
document these in the README file.
* The patch itself. If you are using git (which is *strongly*
recommended) you can easily generate the patch using the
- "git-format-patch". If you then use "git-send-email" to send it to
+ "git format-patch". If you then use "git send-email" to send it to
the U-Boot mailing list, you will avoid most of the common problems
with some other mail clients.
projects / platform / kernel / u-boot.git / blobdiff