Merge remote branch 'remotes/kc/karo-tx6q' into karo-tx28-devel

[karo-tx-uboot.git] / README

diff --git a/README b/README
index a9a92d7f83a30136d60d744b6c9fad9ac06fde0e..e6ea6fe8d476581d043f3851fb8ee37bd6e32bb6 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
@@ -1697,6 +1705,17 @@ CBFS (Coreboot Filesystem) support
                4th and following
                BOOTP requests:         delay 0 ... 8 sec
 
+- BOOTP Random transaction ID:
+               CONFIG_BOOTP_RANDOM_ID
+
+               The standard algorithm to generate a DHCP/BOOTP transaction ID
+               by using the MAC address and the current time stamp may not
+               quite unlikely produce duplicate transaction IDs from different
+               clients in the same network. This option creates a transaction
+               ID using the rand() function. Provided that the RNG has been
+               seeded well, this should guarantee unique transaction IDs
+               always.
+
 - DHCP Advanced Options:
                You can fine tune the DHCP functionality by defining
                CONFIG_BOOTP_* symbols:
@@ -2414,6 +2433,11 @@ 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
 
@@ -2701,10 +2725,13 @@ 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.
 
@@ -2803,6 +2830,12 @@ 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.
@@ -2860,6 +2893,10 @@ 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