Merge remote-tracking branch 'mpc83xx/next'

[karo-tx-uboot.git] / README

diff --git a/README b/README
index 78f40dfb5aef64b476b7945166b55542a9f60cc1..2352e3862bfa81f4ad2bca262cc26529ac008fd7 100644 (file)
--- 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
@@ -849,6 +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
@@ -2378,6 +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
 
@@ -2696,10 +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.
 
@@ -2798,6 +2819,12 @@ FIT uImage format:
                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.
@@ -2855,6 +2882,10 @@ FIT uImage format:
                CONFIG_SPL_LIBGENERIC_SUPPORT
                Support for lib/libgeneric.o in SPL binary
 
+               CONFIG_SPL_PAD_TO
+               Linker address to which the SPL should be padded before
+               appending the SPL payload.
+
                CONFIG_SPL_TARGET
                Final target image containing SPL and payload.  Some SPLs
                use an arch-specific makefile fragment instead, for
@@ -3453,6 +3484,16 @@ 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:
 ---------------------------------------------------