Syslinux - Apr 2011 - ifcpu(64).c32 does not detect Athlon II X4

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?

Thank you,
Andreas

What version of syslinux are you using ?

Speaking about the ifcpu, what was your command line ?

Can you show us the result of

cat /proc/cpuinfo

and also, some output of HDT while reading the cpu information ?

Cheers,

2011/4/4 Andreas Heinlein <aheinlein at gmx.com>
> 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?
>
> Thank you,
> Andreas
>
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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.