From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754854AbYHMCiU (ORCPT ); Tue, 12 Aug 2008 22:38:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753424AbYHMCiJ (ORCPT ); Tue, 12 Aug 2008 22:38:09 -0400 Received: from one.firstfloor.org ([213.235.205.2]:47771 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753318AbYHMCiI (ORCPT ); Tue, 12 Aug 2008 22:38:08 -0400 To: Chris Adams Cc: linux-kernel@vger.kernel.org Subject: Re: AGP aperture beyond 4GB not valid? From: Andi Kleen References: <20080813013255.GD633804@hiwaay.net> Date: Wed, 13 Aug 2008 04:38:04 +0200 In-Reply-To: <20080813013255.GD633804@hiwaay.net> (Chris Adams's message of "Tue, 12 Aug 2008 20:32:55 -0500") Message-ID: <87k5el1vxv.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Chris Adams 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