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Date:      Wed, 19 May 1999 13:29:56 -0400 (EDT)
From:      Luoqi Chen <luoqi@watermarkgroup.com>
To:        luoqi@watermarkgroup.com, mike@smith.net.au
Cc:        ctapang@easystreet.com, current@FreeBSD.ORG, jerry.alexandratos@perspectives.net, jlemon@americantv.com
Subject:   Re: FBSDBOOT.EXE
Message-ID:  <199905191729.NAA14869@lor.watermarkgroup.com>

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> Not at all.  If there's 640k chopped off the end of eg. 128M of 
> physical memory, you'd have to use a 64M segment, a 32M segment, a 16M 
> segment, an 8M segment, a 4M segment, a 2M segment, a 1M segment, a 
> 256k segment and a 128k segment to map it accurately.  That's 9 
> variable MTRRs, and the P6 only has 8.
> 
No you don't need that many, fixed MTRRs take precedence over variable MTRRs,
so you can just use one variable segment covering 0-128M and override with
fixed MTRRs in the low memory area.

> -- 
> \\  The mind's the standard       \\  Mike Smith
> \\  of the man.                   \\  msmith@freebsd.org
> \\    -- Joseph Merrick           \\  msmith@cdrom.com
> 
> 
> 

-lq


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