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| author | Alexandru Gagniuc <mr.nuke.me@gmail.com> | 2013-06-04 23:37:56 -0500 |
|---|---|---|
| committer | Ronald G. Minnich <rminnich@gmail.com> | 2013-06-10 22:30:04 +0200 |
| commit | 88a302346f35580f6ede166a9a0f3ee60343c482 (patch) | |
| tree | ac1769556061605355e91019a2b0c91af30a57b8 /src/northbridge/via/vx900/romstrap.inc | |
| parent | ee2bc27dc58611e83ec7670163fb8a69aa1adb03 (diff) | |
| download | coreboot-88a302346f35580f6ede166a9a0f3ee60343c482.tar.xz | |
VX900: Add support for early romstage
Add support for VX900 early initialization up until, but not including
raminit. Add the basic infrastructure, add a romstrap table, and
functionality to configure the CPU bus and SMBus.
This code is necessary and sufficient to prepare us for raminit.
Change-Id: Icc9c41e4927b589f17416836f87a6a5843b24aa7
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/3372
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/northbridge/via/vx900/romstrap.inc')
| -rw-r--r-- | src/northbridge/via/vx900/romstrap.inc | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/northbridge/via/vx900/romstrap.inc b/src/northbridge/via/vx900/romstrap.inc new file mode 100644 index 0000000000..e4ce67728a --- /dev/null +++ b/src/northbridge/via/vx900/romstrap.inc @@ -0,0 +1,60 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2004 Tyan Computer + * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan Computer) + * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> + * Copyright (C) 2009 One Laptop per Child, Association, Inc. + * Copyright (C) 2011-2012 Alexandru Gagniuc <mr.nuke.me@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* As extracted from the manufacturer's ROM, the romstrap table looks like: + * .long 0x77886047 .long 0x00777777 + * .long 0x00000000 .long 0x00000000 + * .long 0x00888888 .long 0x00AA1111 + * .long 0x00000000 .long 0x00000000 + * + * The vendor BIOS then adjusts some of these settings very early on. Instead of + * adjusting those settings in code, we work them in the romstrap table. + * + */ +/* This file constructs the ROM strap table for VX900 */ + + .section ".romstrap", "a", @progbits + + .globl __romstrap_start +__romstrap_start: +tblpointer: + .long 0x77886047 + .long 0x00777777 + .long 0x00000000 + .long 0x00000000 + .long 0x00888888 + .long 0x00AA1111 + .long 0x00000000 + .long 0x00000000 + +/* + * The pointer to above table should be at 0xffffffd0, + * the table itself MUST be aligned to 128B it seems! + */ +rspointers: + .long tblpointer // It will be 0xffffffd0 + + .globl __romstrap_end + +__romstrap_end: +.previous |