linux-kernel - Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately?

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Message-ID: <Pine.LNX.4.64.0706011618270.7446@p34.internal.lan>
Date:	Fri, 1 Jun 2007 16:19:26 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't
 the kernel realize the BIOS has problems and re-map appropriately?

On Fri, 1 Jun 2007, Andi Kleen wrote:

> Jesse Barnes <jbarnes@...tuousgeek.org> writes:
>
>> (or we get proper PAT support, which I think would make this problem
>> go away as well).
>
> No it won't. If the basic MTRRs for memory are wrong just having PAT support
> in drivers (which already exist in a limited form already, just for
> UC only) won't change anything.
>
> -Andi
>

Basically from what I read:

1. The MCH/ICH8 hub 'requires' a minimum of 512MB to run, the board manual 
states it needs at least 512MB of memort.
2. The DVT/IGP graphics uses either 128MB or 256MB, I have it set to 
128MB.

How can the Linux kernel find this out/poll this information so users do 
not have to know mem=XXXXM?

Justin.
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