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authorZhao Yakui <yakui.zhao@intel.com>2008-12-17 16:55:18 +0800
committerLen Brown <len.brown@intel.com>2009-01-09 01:41:58 -0500
commit237889bf0a62f1399fb2ba0c2a259e6a96597131 (patch)
tree248d6bf6e4e60c8760b9a2b6ba2e788b70e24c76 /drivers/acpi
parent13b40a1a065824d2d4e55c8b48ea9f3f9d162929 (diff)
ACPI : Use RSDT instead of XSDT by adding boot option of "acpi=rsdt"
On some boxes there exist both RSDT and XSDT table. But unfortunately sometimes there exists the following error when XSDT table is used: a. 32/64X address mismatch b. The 32/64X FACS address mismatch In such case the boot option of "acpi=rsdt" is provided so that RSDT is tried instead of XSDT table when the system can't work well. http://bugzilla.kernel.org/show_bug.cgi?id=8246 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> cc:Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/tables/tbutils.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c
index 0cc92ef5236..da9f240186e 100644
--- a/drivers/acpi/tables/tbutils.c
+++ b/drivers/acpi/tables/tbutils.c
@@ -420,7 +420,8 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
/* Differentiate between RSDT and XSDT root tables */
- if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
+ if (rsdp->revision > 1 && rsdp->xsdt_physical_address
+ && !acpi_rsdt_forced) {
/*
* Root table is an XSDT (64-bit physical addresses). We must use the
* XSDT if the revision is > 1 and the XSDT pointer is present, as per