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-rw-r--r--src/northbridge/amd/amdk8/acpi.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/northbridge/amd/amdk8/acpi.c b/src/northbridge/amd/amdk8/acpi.c
index 10228cfa94..ce49b9021c 100644
--- a/src/northbridge/amd/amdk8/acpi.c
+++ b/src/northbridge/amd/amdk8/acpi.c
@@ -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";