diff options
| -rw-r--r-- | src/northbridge/amd/amdfam10/acpi.c | 17 |
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; |