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ACPI: Fix corrupt SSDT table on multiprocessor AMD Family 10h systems 

Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Change-Id: I3175c8b29e94a27a2db6b11f8fc9e1d91bde11f9
Reviewed-on: http://review.coreboot.org/8259
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Timothy Pearson 2015-01-23 20:18:56 -06:00 committed by Alexandru Gagniuc
parent ae9cd01460
commit 367fe8cac1
1 changed files with 17 additions and 0 deletions
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17
src/northbridge/amd/amdfam10/acpi.c
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@ -1,6 +1,7 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* Copyright (C) 2007 Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify
@ -187,6 +188,22 @@ void update_ssdtx(void *ssdtx, int i)
void northbridge_acpi_write_vars(void)
{
/*
* If more than one physical CPU is installed, northbridge_acpi_write_vars()
* is called more than once and the resultant SSDT table is corrupted
* (duplicated entries).
* This prevents Linux from booting, with log messages like these:
* ACPI Error: [BUSN] Namespace lookup failure, AE_ALREADY_EXISTS (/dswload-353)
* ACPI Exception: AE_ALREADY_EXISTS, During name lookup/catalog (/psobject-222)
* followed by a slew of ACPI method failures and a hang when the invalid PCI
* resource entries are used.
* This routine prevents the SSDT table from being corrupted.
*/
static uint8_t ssdt_generated = 0;
if (ssdt_generated)
return;
ssdt_generated = 1;
msr_t msr;
char pscope[] = "\\_SB.PCI0";
int i;