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authorLen Brown <len.brown@intel.com>2007-11-23 20:08:02 -0500
committerLen Brown <len.brown@intel.com>2007-12-14 02:36:24 -0500
commit239665a3bb0a2234980f918913add31bc536cfd1 (patch)
tree260262706ce5223bf3d1cec0e8083ea42260f2fb /drivers/acpi/osl.c
parent2ffbb8377c7a0713baf6644e285adc27a5654582 (diff)
ACPI: tables: complete searching upon RSDP w/ bad checksum.
ACPI tables follow a tree structure in memory. The root of the tree is the RSDP (Root System Description Pointer). To find the RSDP, the OS searches for the signature "RSD PTR " in well known physical memory locations. Then the OS computes a table checksum to verify that the signature is really part of a valid table header. Some systems have a proper signature but an invalid checksum; followed elsewhere by a proper signature with valid checksum. http://bugzilla.kernel.org/show_bug.cgi?id=9444 The Linux RSDP scanning code bailed out on those systems and as a result they booted with ACPI disabled. Fix this by deleting the Linux RSDP scanning code and plugging in the ACPICA RSDP scanning code. Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/osl.c')
-rw-r--r--drivers/acpi/osl.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index aabc6ca4a81c..101691ef66cb 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -207,8 +207,12 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
"System description tables not found\n");
return 0;
}
- } else
- return acpi_find_rsdp();
+ } else {
+ acpi_physical_address pa = 0;
+
+ acpi_find_root_pointer(&pa);
+ return pa;
+ }
}
void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)