ACPI: add boot option acpi=copy_dsdt to fix corrupt DSDT

Some BIOS on Toshiba machines corrupt the DSDT, so add a new
boot option acpi=copy_dsdt to workaround it.
Add warning message to ask users to use this option if corrupt DSDT detected.

Also build a DMI blacklist to check it and automatically copy DSDT.

https://bugzilla.kernel.org/show_bug.cgi?id=14679

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e2202e93b148..93f113a1b326 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -151,6 +151,7 @@ and is between 256 and 4096 characters. It is defined in the file
                         strict -- Be less tolerant of platforms that are not
                                 strictly ACPI specification compliant.
                         rsdt -- prefer RSDT over (default) XSDT
+                        copy_dsdt -- copy DSDT to memory
 
                         See also Documentation/power/pm.txt, pci=noacpi