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-rw-r--r--src/northbridge/amd/amdfam10/acpi.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/northbridge/amd/amdfam10/acpi.c b/src/northbridge/amd/amdfam10/acpi.c
index 463fb7cb8a..9ffea36aa0 100644
--- a/src/northbridge/amd/amdfam10/acpi.c
+++ b/src/northbridge/amd/amdfam10/acpi.c
@@ -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;