[syslinux] ifcpu(64).c32 does not detect Athlon II X4

[H. Peter Anvin]

On 04/03/2011 11:55 PM, Andreas Heinlein wrote:
> Hello,
> 
> as said in the subject; I am having problems with ifcpu.c32 and
> ifcpu64.c32 detecting a Athlon II X4 CPU correctly as a 64Bit capable
> CPU. Ifcpu64.c32 does not detect PAE capabilities, also. Both boot the
> last (32Bit, non-PAE) entry. On two other Core2-based machines I have
> here, everything works.
> 
> Can someone tell me what exactly these modules are looking for? Maybe I
> can compare that with /proc/cpuinfo output and tell what's wrong.
> 
> I'd like to incorporate this feature into a live CD which we intent to
> publish, so this should work fairly reliably. Do you have any other
> experiences with these modules?
> 

They look for the PAE and the LM bits in CPUID.

There are some CPUs which mask certain CPUID bits... I don't know if
those are affected.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.