index 5105e64a388d257c625d0480879203889af7f712..d51ece946c309a37fa3fcf5c1d91f0174e2b016f 100644 (file)
--- a/README
+++ b/README
boot loader that has already initialized the UART. Define this
variable to flush the UART at init time.
+ CONFIG_SYS_NS16550_BROKEN_TEMT
+
+ 16550 UART set the Transmitter Empty (TEMT) Bit when all output
+ has finished and the transmitter is totally empty. U-Boot waits
+ for this bit to be set to initialize the serial console. On some
+ broken platforms this bit is not set in SPL making U-Boot to
+ hang while waiting for TEMT. Define this option to avoid it.
+
- Console Interface:
Depending on board, define exactly one serial port
CONFIG_CMD_I2C * I2C serial bus support
CONFIG_CMD_IDE * IDE harddisk support
CONFIG_CMD_IMI iminfo
- CONFIG_CMD_IMLS List all found images
+ CONFIG_CMD_IMLS List all images found in NOR flash
+ CONFIG_CMD_IMLS_NAND List all images found in NAND flash
CONFIG_CMD_IMMAP * IMMR dump support
CONFIG_CMD_IMPORTENV * import an environment
CONFIG_CMD_INI * import data from an ini file into the env
CONFIG_CMD_LOADS loads
CONFIG_CMD_MD5SUM print md5 message digest
(requires CONFIG_CMD_MEMORY and CONFIG_MD5)
+ CONFIG_CMD_MEMINFO * Display detailed memory information
CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
loop, loopw, mtest
CONFIG_CMD_MISC Misc functions like sleep etc
CONFIG_CMD_READ * Read raw data from partition
CONFIG_CMD_REGINFO * Register dump
CONFIG_CMD_RUN run command in env variable
+ CONFIG_CMD_SANDBOX * sb command to access sandbox features
CONFIG_CMD_SAVES * save S record dump
CONFIG_CMD_SCSI * SCSI Support
CONFIG_CMD_SDRAM * print SDRAM configuration information
Normally display is black on white background; define
CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
+ CONFIG_LCD_ALIGNMENT
+
+ Normally the LCD is page-aligned (tyically 4KB). If this is
+ defined then the LCD will be aligned to this value instead.
+ For ARM it is sometimes useful to use MMU_SECTION_SIZE
+ here, since it is cheaper to change data cache settings on
+ a per-section basis.
+
+ CONFIG_CONSOLE_SCROLL_LINES
+
+ When the console need to be scrolled, this is the number of
+ lines to scroll by. It defaults to 1. Increasing this makes
+ the console jump but can help speed up operation when scrolling
+ is slow.
+
CONFIG_LCD_BMP_RLE8
Support drawing of RLE8-compressed bitmaps on the LCD.
Enables an 'i2c edid' command which can read EDID
information over I2C from an attached LCD display.
-
- Splash Screen Support: CONFIG_SPLASH_SCREEN
If this option is set, the environment is checked for
allows for a "silent" boot where a splash screen is
loaded very quickly after power-on.
+ CONFIG_SPLASHIMAGE_GUARD
+
+ If this option is set, then U-Boot will prevent the environment
+ variable "splashimage" from being set to a problematic address
+ (see README.displaying-bmps and README.arm-unaligned-accesses).
+ This option is useful for targets where, due to alignment
+ restrictions, an improperly aligned BMP image will cause a data
+ abort. If you think you will not have problems with unaligned
+ accesses (for example because your toolchain prevents them)
+ there is no need to set this option.
+
CONFIG_SPLASH_SCREEN_ALIGN
If this option is set the splash image can be freely positioned
=> vertically centered image
at x = dspWidth - bmpWidth - 9
+ CONFIG_SPLASH_SCREEN_PREPARE
+
+ If this option is set then the board_splash_screen_prepare()
+ function, which must be defined in your code, is called as part
+ of the splash screen display sequence. It gives the board an
+ opportunity to prepare the splash image data before it is
+ processed and sent to the frame buffer by U-Boot.
+
- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
If this option is set, additionally to standard BMP
run-time determined information about the hardware to the
environment. These will be named board_name, board_rev.
+ CONFIG_DELAY_ENVIRONMENT
+
+ Normally the environment is loaded when the board is
+ intialised so that it is available to U-Boot. This inhibits
+ that so that the environment is not available until
+ explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
+ this is instead controlled by the value of
+ /config/load-environment.
+
- DataFlash Support:
CONFIG_HAS_DATAFLASH
CONFIG_SF_DEFAULT_MODE (see include/spi.h)
CONFIG_SF_DEFAULT_SPEED in Hz
+ CONFIG_CMD_SF_TEST
+
+ Define this option to include a destructive SPI flash
+ test ('sf test').
+
- SystemACE Support:
CONFIG_SYSTEMACE
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
- grabs the memory for frame buffer by panel's size).
+ address for frame buffer. This is typically the case
+ when using a graphics controller has separate video
+ memory. U-Boot will then place the frame buffer at
+ the given address instead of dynamically reserving it
+ in system RAM by calling lcd_setmem(), which grabs
+ the memory for the frame buffer depending on the
+ configured panel size.
Please see board_init_f function.
CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
Filename to read to load U-Boot when reading from FAT
+ CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
+ Set this for NAND SPL on PPC mpc83xx targets, so that
+ start.S waits for the rest of the SPL to load before
+ continuing (the hardware starts execution after just
+ loading the first page rather than the full 4K).
+
CONFIG_SPL_NAND_BASE
Include nand_base.c in the SPL. Requires
CONFIG_SPL_NAND_DRIVERS.
non page size aligned address and this could cause major
problems.
-- CONFIG_SYS_TFTP_LOADADDR:
- Default load address for network file downloads
-
- CONFIG_SYS_LOADS_BAUD_CHANGE:
Enable temporary baudrate change while serial download
space for already greatly restricted images, including but not
limited to NAND_SPL configurations.
+- CONFIG_DISPLAY_BOARDINFO
+ Display information about the board that U-Boot is running on
+ when U-Boot starts up. The board function checkboard() is called
+ to do this.
+
+- CONFIG_DISPLAY_BOARDINFO_LATE
+ Similar to the previous option, but display this information
+ later, once stdio is running and output goes to the LCD, if
+ present.
+
Low Level (hardware related) configuration options:
---------------------------------------------------
that is executed before the actual U-Boot. E.g. when
compiling a NAND SPL.
+- CONFIG_ARCH_MAP_SYSMEM
+ Generally U-Boot (and in particular the md command) uses
+ effective address. It is therefore not necessary to regard
+ U-Boot address as virtual addresses that need to be translated
+ to physical addresses. However, sandbox requires this, since
+ it maintains its own little RAM buffer which contains all
+ addressable memory. This option causes some memory accesses
+ to be mapped through map_sysmem() / unmap_sysmem().
+
- CONFIG_USE_ARCH_MEMCPY
CONFIG_USE_ARCH_MEMSET
If these options are used a optimized version of memcpy/memset will
be used if available. These functions may be faster under some
conditions but may increase the binary size.
-- CONFIG_X86_NO_RESET_VECTOR
- If defined, the x86 reset vector code is excluded. You will need
- to do this when U-Boot is running from Coreboot.
-
-- CONFIG_X86_NO_REAL_MODE
- If defined, x86 real mode code is omitted. This assumes a
- 32-bit environment where such code is not needed. You will
- need to do this when U-Boot is running from Coreboot.
+- CONFIG_X86_RESET_VECTOR
+ If defined, the x86 reset vector code is included. This is not
+ needed when U-Boot is running from Coreboot.
Freescale QE/FMAN Firmware Support: