X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-u-boot.git;a=blobdiff_plain;f=README;h=a33647623767f52c971e5ca2cc70c653cecf24dc;hp=a80441c9b57f5ce26fe34484bffd7c5e206b81af;hb=HEAD;hpb=caddc17f3019a437b972cd04a8c9a9cbea344def diff --git a/README b/README index a80441c9b5..a336476237 100644 --- a/README +++ b/README @@ -616,6 +616,14 @@ The following options need to be configured: 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 @@ -815,6 +823,8 @@ The following options need to be configured: CONFIG_CMD_EDITENV edit env variable CONFIG_CMD_EEPROM * EEPROM read/write support CONFIG_CMD_ELF * bootelf, bootvx + CONFIG_CMD_ENV_CALLBACK * display details about env callbacks + CONFIG_CMD_ENV_FLAGS * display details about env flags CONFIG_CMD_EXPORTENV * export the environment CONFIG_CMD_EXT2 * ext2 command support CONFIG_CMD_EXT4 * ext4 command support @@ -847,6 +857,7 @@ The following options need to be configured: 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 @@ -1484,6 +1495,21 @@ CBFS (Coreboot Filesystem) support 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. @@ -1493,7 +1519,6 @@ CBFS (Coreboot Filesystem) support 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 @@ -2187,6 +2212,11 @@ CBFS (Coreboot Filesystem) support serial# is unaffected by this, i. e. it remains read-only.] + The same can be accomplished in a more flexible way + for any variable by configuring the type of access + to allow for those variables in the ".flags" variable + or define CONFIG_ENV_FLAGS_LIST_STATIC. + - Protected RAM: CONFIG_PRAM @@ -2357,6 +2387,15 @@ CBFS (Coreboot Filesystem) support 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 @@ -2383,6 +2422,11 @@ CBFS (Coreboot Filesystem) support 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 @@ -2670,10 +2714,13 @@ FIT uImage format: 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. @@ -2968,9 +3015,6 @@ Configuration Settings: 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 @@ -3112,6 +3156,49 @@ Configuration Settings: cases. This setting can be used to tune behaviour; see lib/hashtable.c for details. +- CONFIG_ENV_FLAGS_LIST_DEFAULT +- CONFIG_ENV_FLAGS_LIST_STATIC + Enable validation of the values given to enviroment variables when + calling env set. Variables can be restricted to only decimal, + hexadecimal, or boolean. If CONFIG_CMD_NET is also defined, + the variables can also be restricted to IP address or MAC address. + + The format of the list is: + type_attribute = [s|d|x|b|i|m] + access_atribute = [a|r|o|c] + attributes = type_attribute[access_atribute] + entry = variable_name[:attributes] + list = entry[,list] + + The type attributes are: + s - String (default) + d - Decimal + x - Hexadecimal + b - Boolean ([1yYtT|0nNfF]) + i - IP address + m - MAC address + + The access attributes are: + a - Any (default) + r - Read-only + o - Write-once + c - Change-default + + - CONFIG_ENV_FLAGS_LIST_DEFAULT + Define this to a list (string) to define the ".flags" + envirnoment variable in the default or embedded environment. + + - CONFIG_ENV_FLAGS_LIST_STATIC + Define this to a list (string) to define validation that + should be done if an entry is not found in the ".flags" + environment variable. To override a setting in the static + list, simply add an entry for the same variable name to the + ".flags" variable. + +- CONFIG_ENV_ACCESS_IGNORE_FORCE + If defined, don't allow the -f switch to env set override variable + access flags. + The following definitions that deal with the placement and management of environment data (variable area); in general, we support the following configurations: @@ -3387,6 +3474,16 @@ use the "saveenv" command to store a valid environment. 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: --------------------------------------------------- @@ -4213,6 +4310,36 @@ Please note that changes to some configuration parameters may take only effect after the next boot (yes, that's just like Windoze :-). +Callback functions for environment variables: +--------------------------------------------- + +For some environment variables, the behavior of u-boot needs to change +when their values are changed. This functionailty allows functions to +be associated with arbitrary variables. On creation, overwrite, or +deletion, the callback will provide the opportunity for some side +effect to happen or for the change to be rejected. + +The callbacks are named and associated with a function using the +U_BOOT_ENV_CALLBACK macro in your board or driver code. + +These callbacks are associated with variables in one of two ways. The +static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC +in the board configuration to a string that defines a list of +associations. The list must be in the following format: + + entry = variable_name[:callback_name] + list = entry[,list] + +If the callback name is not specified, then the callback is deleted. +Spaces are also allowed anywhere in the list. + +Callbacks can also be associated by defining the ".callbacks" variable +with the same list format above. Any association in ".callbacks" will +override any association in the static list. You can define +CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the +".callbacks" envirnoment variable in the default or embedded environment. + + Command Line Parsing: =====================