linux-kernel - Re: [PATCH] x86_32: trim memory by updating e820 v3

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Date:	Sun, 27 Apr 2008 10:29:06 +0200
From:	Mika Fischer <mika.fischer@...pnet.de>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>, balajirrao@...il.com
Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3

Yinghai Lu wrote:
>>  reg00: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
>>  reg01: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
>>  reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
>>  reg03: base=0xbf700000 (3063MB), size= 1MB: uncachable, count=1
>>  reg04: base=0xbf800000 (3064MB), size= 8MB: uncachable, count=1
>>
>>  which screws up the X server's attempt to map the video memory at
>>  0xd0000000.
> 
> the BIOS should have set memhole to 2048MB or 2560M instead of 1033MB
> 
> good mtrr should
> 
>>  reg00: base=0x00000000 (0MB), size=2048MB: write-back, count=1
>>  reg01: base=0x100000000 (4096MB), size=2048MB: write-back, count=1
> 
> or
> 
>>  reg00: base=0x00000000 (0MB), size=2048MB: write-back, count=1
>>  reg01: base=0x80000000 (2048MB), size=512MB: write-back, count=1
>>  reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
>>  reg03: base=0x140000000 (4096MB), size=512MB: write-back, count=1
> 
> so please talk to your HW esp CPU vendor to fix the BIOS problem.

This is a Core 2 Duo CPU, so my CPU vendor is Intel. I assume that the
relevant people are already reading this, no?

I'm not sure what I'm supposed to do? Write an Email to Intel support,
referencing this thread? Doesn't anyone here already know the right
people at Intel who could actually do something about this. I think that
would be more useful since I doubt an email to Intel support would reach
those people...

Regards,
 Mika

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