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ACPI: tables: complete searching upon RSDP w/ bad checksum.

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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>
This commit is contained in:
Len Brown
2007-11-23 20:08:02 -05:00
parent 2ffbb8377c
commit 239665a3bb
7 changed files with 23 additions and 60 deletions
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2
arch/x86/kernel/srat_32.c
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@@ -276,7 +276,7 @@ int __init get_memcfg_from_srat(void)
int tables = 0;
int i = 0;
rsdp_address = acpi_find_rsdp();
rsdp_address = acpi_os_get_root_pointer();
if (!rsdp_address) {
printk("%s: System description tables not found\n",
__FUNCTION__);