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List:       linux-kernel
Subject:    Re: x86 PAT errata
From:       "H. Peter Anvin" <hpa () zytor ! com>
Date:       2001-01-25 22:28:32
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Followup to:  <200101251745.SAA07063@harpo.it.uu.se>
By author:    Mikael Pettersson <mikpe@csd.uu.se>
In newsgroup: linux.dev.kernel
>
> Before people get too exited about the x86 Page Attribute Table ...
> Does Linux use mode B (CR4.PSE=1) or mode C (CR4.PAE=1) paging?
> If so, known P6 errata must be taken into account.
> In particular, Pentium III errata E27 and Pentium II errata A56
> imply that only the low four PAT entries are working for 4KB
> pages, if CR4.PSE or CR4.PAE is enabled.
> 

All of the above.  Sounds like PAT should be declared broken on these
chips.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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