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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 /arch/x86/kernel/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 'arch/x86/kernel/acpi')
-rw-r--r--arch/x86/kernel/acpi/boot.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 4c51a2f8fd3..db1a90a76b3 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -47,7 +47,7 @@
#endif
static int __initdata acpi_force = 0;
-
+u32 acpi_rsdt_forced;
#ifdef CONFIG_ACPI
int acpi_disabled = 0;
#else
@@ -1783,6 +1783,10 @@ static int __init parse_acpi(char *arg)
disable_acpi();
acpi_ht = 1;
}
+ /* acpi=rsdt use RSDT instead of XSDT */
+ else if (strcmp(arg, "rsdt") == 0) {
+ acpi_rsdt_forced = 1;
+ }
/* "acpi=noirq" disables ACPI interrupt routing */
else if (strcmp(arg, "noirq") == 0) {
acpi_noirq_set();