Merge branch 'master' of git://www.denx.de/git/u-boot-fdt

[karo-tx-uboot.git] / README

diff --git a/README b/README
index 18b720c235d2651c55707196f954e5347a6d3a02..5d059e73c6836ddbe8a5cb4fd115e4238fa4efb3 100644 (file)
--- a/README
+++ b/README
@@ -738,6 +738,9 @@ The following options need to be configured:
                CONFIG_E1000
                Support for Intel 8254x gigabit chips.
 
+               CONFIG_E1000_FALLBACK_MAC
+               default MAC for empty eeprom after production.
+
                CONFIG_EEPRO100
                Support for Intel 82557/82559/82559ER chips.
                Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
@@ -1138,6 +1141,20 @@ The following options need to be configured:
                of the "hostname" environment variable is passed as
                option 12 to the DHCP server.
 
+               CONFIG_BOOTP_DHCP_REQUEST_DELAY
+
+               A 32bit value in microseconds for a delay between
+               receiving a "DHCP Offer" and sending the "DHCP Request".
+               This fixes a problem with certain DHCP servers that don't
+               respond 100% of the time to a "DHCP request". E.g. On an
+               AT91RM9200 processor running at 180MHz, this delay needed
+               to be *at least* 15,000 usec before a Windows Server 2003
+               DHCP server would reply 100% of the time. I recommend at
+               least 50,000 usec to be safe. The alternative is to hope
+               that one of the retries will be successful but note that
+               the DHCP timeout and retry process takes a longer than
+               this delay.
+
  - CDP Options:
                CONFIG_CDP_DEVICE_ID
 
@@ -1916,6 +1933,27 @@ Configuration Settings:
                Scratch address used by the alternate memory test
                You only need to set this if address zero isn't writeable
 
+- CFG_MEM_TOP_HIDE (PPC only):
+               If CFG_MEM_TOP_HIDE is defined in the board config header,
+               this specified memory area will get subtracted from the top
+               (end) of ram and won't get "touched" at all by U-Boot. By
+               fixing up gd->ram_size the Linux kernel should gets passed
+               the now "corrected" memory size and won't touch it either.
+               This should work for arch/ppc and arch/powerpc. Only Linux
+               board ports in arch/powerpc with bootwrapper support that
+               recalculate the memory size from the SDRAM controller setup
+               will have to get fixed in Linux additionally.
+
+               This option can be used as a workaround for the 440EPx/GRx
+               CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
+               be touched.
+
+               WARNING: Please make sure that this value is a multiple of
+               the Linux page size (normally 4k). If this is not the case,
+               then the end address of the Linux memory will be located at a
+               non page size aligned address and this could cause major
+               problems.
+
 - CFG_TFTP_LOADADDR:
                Default load address for network file downloads