[coreboot] AMD S3: Experiences with ACPI 2.0 method _BFS (Back From Sleep)

[Paul Menzel]

Dear coreboot folks,


searching for ACPI in the output of `dmesg` I noticed the following
message.

        $ uname -v
        #1 SMP Debian 3.2.35-2
        $ dmesg | grep -i acpi
        [    0.154063] ACPI: BIOS offers _BFS
        [    0.154067] ACPI: If "acpi.bfs=1" improves resume, please notify linux-acpi at vger.kernel.org

Doing

   $ git grep _GTA

reveals that it is only implemented in the DSDT of AMD based boards. As
resuming currently does not work on the ASRock E350M1 [1], I cannot test
that.

Was this ever tested by adding `acpi.bfs=1` to the Linux kernel command
line and what was the outcome? A test on AMD Persimmon would be very
interesting.

It looks like support for this has been removed in the meantime though

        commit 3f6f49c7854c9294119437a82c5b35be78f9cea6
        Author: Len Brown <len.brown at intel.com>
        Date:   Thu Jul 26 20:08:54 2012 -0400
        
            ACPI: delete _GTS/_BFS support

since Linux Git tag v3.6-rc2.


Thanks,

Paul


[1] http://www.coreboot.org/ASRock_E350M1
[2] https://patchwork.kernel.org/patch/1246671/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 198 bytes
Desc: This is a digitally signed message part
URL: <http://www.coreboot.org/pipermail/coreboot/attachments/20130218/412a5781/attachment.sig>