linux-kernel - Re: MTRR initialization

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Message-ID: <46ED54EF.3040209@symas.com>
Date:	Sun, 16 Sep 2007 09:08:15 -0700
From:	Howard Chu <hyc@...as.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: MTRR initialization

Yinghai Lu wrote:
> 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.

Thanks for the reply. Unfortunately this BIOS doesn't seem to have any other options related to the 
MTRRs. I guess I'll just live with this hack.
-- 
   -- Howard Chu
   Chief Architect, Symas Corp.  http://www.symas.com
   Director, Highland Sun        http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP     http://www.openldap.org/project/

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