linux-kernel - Re: MTRR initialization

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Date:	Fri, 14 Sep 2007 10:12:52 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Howard Chu" <hyc@...as.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: MTRR initialization

On 9/14/07, Howard Chu <hyc@...as.com> wrote:
> Hi, was wondering if anyone else has been tripped up by this... I've got 4GB of
> RAM in my Asus A8V Deluxe and memory hole mapping enabled in the BIOS. By
> default, my system boots up with these MTRR settings:
>
> reg00: base=0x00000000 (   0MB), size=4096MB: write-back, count=1
> reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
> reg02: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
> reg03: base=0xc0000000 (3072MB), size= 256MB: write-combining, count=1

BIOS should have another setup option about MTRR (continous?)
then you could get

> reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
> reg01: base=0x100000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
===> if you have rev E...instead of rev F.

YH
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