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AMD K8: Avoid duplicate variables in SSDT on multisocket systems 

Related-to: I3175c8b29e94a27a2db6b11f8fc9e1d91bde11f9
 (ACPI: Fix corrupt SSDT table on multiprocessor AMD Family 10h systems)

Change-Id: I0b5f265278d90cbaeddc6fc4432933856050f784
Signed-off-by: Jonathan A. Kollasch <jakllsch@kollasch.net>
Reviewed-on: http://review.coreboot.org/10912
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Jonathan A. Kollasch 2015-07-13 21:03:10 -05:00
parent 1fa5274071
commit 0dee57837b
1 changed files with 11 additions and 0 deletions
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11
src/northbridge/amd/amdk8/acpi.c
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@ -282,6 +282,17 @@ static void k8acpi_write_pci_data(int dlen, const char *name, int offset) {
void k8acpi_write_vars(device_t device)
{
/*
* If more than one physical CPU is installed k8acpi_write_vars()
* is called more than once. If we don't prevent it, a SSDT table
* with duplicate variables will cause some ACPI parsers to be
* confused enough to fail.
*/
static uint8_t ssdt_generated = 0;
if (ssdt_generated)
return;
ssdt_generated = 1;
msr_t msr;
char pscope[] = "\\_SB.PCI0";