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svn_rev_636

This commit is contained in:
Sascha Hauer 2007-07-05 18:02:12 +02:00 committed by Sascha Hauer
parent 2af5209ba8
commit 784fa014e2
1 changed files with 20 additions and 5 deletions
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25
Documentation/porting.txt
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@ -73,6 +73,17 @@ console_initcall(scb9328_console_init);
EEPROM just return -1. set_mac_address() shall set the MAC address in
the device. All magic previously done with getenv/setenv(ethaddr) must be
removed.
During startup U-Boot calls get_mac_address() to see if an EEPROM is
connected. If so, it calls set_mac_address() with this address. This
is done even if networking is not used during startup. This makes sure
that the MAC address is set in the device and Linux can pick it up later.
- There is now (the beginning of) generic phy support. When porting drivers
it is recommended to use it. The phy support currently only starts generic
autonegotiation, so if you have some fancy things to do (or have gigabit
ethernet) you'll have to extend the phy layer first. Although this is
extra work, it will pay off some day, as phy support is a great source
of duplicated code. see drivers/net/dm9000.c or drivers/net/fec_mpc5200.c
for examples.
- Add a clocksource for your system. PowerPCs have a generic decrementer
counter, so if you have a PowerPC aou have nothing to do here. on ARM
@ -97,10 +108,14 @@ calc_source:
subi r4, r4, 0x100
(I'm almost sure that PowerPC has a dedicated instruction for this, un-
fortunately I know next to nothing of PowerPC assembler)
fortunately I know next to nothing of PowerPC assembler, so if you have
a better way to archieve this, please write to the list)
U-Boot runs now from the address it was linked to, so on PowerPC you have
to adjust TEXT_BASE to be in RAM. This makes the various fixup functions
unnecessary. It also simplifies debugging because you will see the
correct addresses in the objdump.
On PowerPC U-Boot now runs at the address it was linked to, so you have
to adjust TEXT_BASE to be in RAM. This makes the various fixup relocation
functions unnecessary. On PowerPC the removal of -fPIC saves around 10% of
binary space. It also simplifies debugging because you will see the correct
addresses in the objdump without doing offset calculation.
- On arm most of the duplicate code under cpu/arm* is already merged into
arch/arm/cpu. the start.S files are missing though.