Xen devel - Jan 2012 - Xen 4.1: x86/ucode: fix for AMD Fam15 CPUs

x86/ucode: fix for AMD Fam15 CPUs

Remove hardcoded maximum size a microcode patch can have. This is
dynamic now.

The microcode patch for family15h can be larger than 2048 bytes and
gets silently truncated.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
Backport from xen-unstable changeset 24411:ca5f588bd203 to Xen 4.1


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Am 04.01.2012 16:28, schrieb Christoph Egger:
> 
> x86/ucode: fix for AMD Fam15 CPUs
> 
> Remove hardcoded maximum size a microcode patch can have. This is
> dynamic now.
> 
> The microcode patch for family15h can be larger than 2048 bytes and
> gets silently truncated.
> 
> Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
> Backport from xen-unstable changeset 24411:ca5f588bd203 to Xen 4.1
> 
Could this fix my xen boot problem on athlon x2 (fam 15 according to
cpuinfo)

See xen-devel post:
[Xen-devel] [Xen-users] Problem booting xen 4.1.2 on Athlon 64 X2
from 22.12.2011 ff

Regards,
Florian
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel



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On 01/04/2012 10:50 AM, Florian Manschwetus wrote:
> Am 04.01.2012 16:28, schrieb Christoph Egger:
>> x86/ucode: fix for AMD Fam15 CPUs
>>
>> Remove hardcoded maximum size a microcode patch can have. This is
>> dynamic now.
>>
>> The microcode patch for family15h can be larger than 2048 bytes and
>> gets silently truncated.
>>
>> Signed-off-by: Christoph Egger<Christoph.Egger@amd.com>
>> Backport from xen-unstable changeset 24411:ca5f588bd203 to Xen 4.1
>>
> Could this fix my xen boot problem on athlon x2 (fam 15 according to
> cpuinfo)
>
> See xen-devel post:
> [Xen-devel] [Xen-users] Problem booting xen 4.1.2 on Athlon 64 X2
> from 22.12.2011 ff
Probably not. cpuinfo reports family in decimal. So your Athlon is 
Family 0xF; but Christoph''s patch is for Family 0x15. For a quick 
verification, you can rename your AMD ucode (in /lib/firmware/amd-ucode) 
to prevent it from being loaded. /
/
>
> Regards,
> Florian
>
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>


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