From: Len Brown <len.brown@intel.com>
Date: Sat, 24 Nov 2007 01:08:02 +0000 (-0500)
Subject: ACPI: tables: complete searching upon RSDP w/ bad checksum.
X-Git-Tag: v2.6.25-rc1~297^2~3^2~2^2~1^2~7^11
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=239665a3bb0a2234980f918913add31bc536cfd1;p=pandora-kernel.git

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>
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