linux-kernel - Re: AGP aperture beyond 4GB not valid?

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Message-ID: <87k5el1vxv.fsf@basil.nowhere.org>
Date:	Wed, 13 Aug 2008 04:38:04 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Chris Adams <cmadams@...aay.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: AGP aperture beyond 4GB not valid?

Chris Adams <cmadams@...aay.net> writes:
>
> My BIOS doesn't have an IOMMU option (latest BIOS available for the
> mboard).  However, it appears that an aperture is allocated but the
> kernel then ignores it due to where it is placed.  Why?

32MB is normally not a useful aperture. Likely it's some garbage 
value the BIOS is leaving in the registers.

> Is there anything I can or should do about this (what impact does this
> really have)?

It will eat your babies. No really except for some lost RAM nothing.

-Andi

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