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Bug#643012: PAE Kernel doesn't work with Pentium M

On Mon, 2011-09-26 at 15:38 -0400, Lennart Sorensen wrote:
> On Mon, Sep 26, 2011 at 03:34:36PM -0400, Lennart Sorensen wrote:
> > Ehm, how can PSE introduced by the Pentium III be pre-PAE (which was
> > introduced by the Pentium Pro)?
> > 
> > PSE may be simpler but it's still newer than PAE.
> Well actually PSE (support for larger than 4k pages) predates PAE, but
> PSE-36 (support for larger than 4k pages with 36bit physical address
> range support) comes after PAE.

My mistake, I thought PSE-36 also pre-dated PAE but obviously I was

One thing which is interesting is that "pse36" normally appears separate
from "pse" in /proc/cpuinfo but doesn't appear here, just like "pae" is

I don't see anywhere in the kernel which masks off X86_FEATURE_PAE or
X86_FEATURE_PSE36 though.

I guess running x86info would give the real underlying features
untouched by the kernel if Bernhard wants to confirm.


> PSE came in the pentium, PAE in the Pentium Pro, and PSE-36 in the
> Pentium III.
> -- 
> Len Sorensen

Ian Campbell

Interchangeable parts won't.

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