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authorHuang Ying <ying.huang@intel.com>2011-07-20 16:09:29 +0800
committerLen Brown <len.brown@intel.com>2011-08-03 11:15:59 -0400
commitc3e6088e1036f8084bc7444b38437da136b7588b (patch)
tree1c2d24c8e5812cd21f56679fa57165693c2fb7da /Documentation/acpi
parent70cb6e1da00db6c9212e6fd69bd96fd41c797077 (diff)
downloadkernel-c3e6088e1036f8084bc7444b38437da136b7588b.tar.gz
ACPI, APEI, EINJ Param support is disabled by default
EINJ parameter support is only usable for some specific BIOS. Originally, it is expected to have no harm for BIOS does not support it. But now, we found it will cause issue (memory overwriting) for some BIOS. So param support is disabled by default and only enabled when newly added module parameter named "param_extension" is explicitly specified. Signed-off-by: Huang Ying <ying.huang@intel.com> Cc: Matthew Garrett <mjg@redhat.com> Acked-by: Don Zickus <dzickus@redhat.com> Acked-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation/acpi')
-rw-r--r--Documentation/acpi/apei/einj.txt11
1 files changed, 9 insertions, 2 deletions
diff --git a/Documentation/acpi/apei/einj.txt b/Documentation/acpi/apei/einj.txt
index dfab71848dc8..5cc699ba5453 100644
--- a/Documentation/acpi/apei/einj.txt
+++ b/Documentation/acpi/apei/einj.txt
@@ -48,12 +48,19 @@ directory apei/einj. The following files are provided.
- param1
This file is used to set the first error parameter value. Effect of
parameter depends on error_type specified. For memory error, this is
- physical memory address.
+ physical memory address. Only available if param_extension module
+ parameter is specified.
- param2
This file is used to set the second error parameter value. Effect of
parameter depends on error_type specified. For memory error, this is
- physical memory address mask.
+ physical memory address mask. Only available if param_extension
+ module parameter is specified.
+
+Injecting parameter support is a BIOS version specific extension, that
+is, it only works on some BIOS version. If you want to use it, please
+make sure your BIOS version has the proper support and specify
+"param_extension=y" in module parameter.
For more information about EINJ, please refer to ACPI specification
version 4.0, section 17.5.