Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965279AbVLRUHO (ORCPT ); Sun, 18 Dec 2005 15:07:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965278AbVLRUHO (ORCPT ); Sun, 18 Dec 2005 15:07:14 -0500 Received: from mail.avalus.com ([195.82.114.197]:62088 "EHLO shed.alex.org.uk") by vger.kernel.org with ESMTP id S965277AbVLRUHM (ORCPT ); Sun, 18 Dec 2005 15:07:12 -0500 Date: Sun, 18 Dec 2005 20:07:08 +0000 From: Alex Bligh - linux-kernel Reply-To: Alex Bligh - linux-kernel To: Michael Madore , linux-kernel@vger.kernel.org Cc: Alex Bligh - linux-kernel Subject: Re: PCI-DMA: high address but no IOMMU (still there) Message-ID: <92C54DAE01BADE27ACF9C370@[192.168.100.25]> In-Reply-To: References: X-Mailer: Mulberry/4.0.4 (Win32) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1145 Lines: 34 --On 27 October 2005 10:47 -0700 Michael Madore wrote: > Hi, > > I am seeing the following errors in /var/log/messages when booting > 2.6.14-rc5 on a dual Opteron nforce4 motherboard with 8GB of RAM: For the record, I was seeing the same problem with 2.6.15-rc5 (it wasn't there on 2.6.12), but the thread I'm replying to isolated the problem patch. A workaround here (Phoenix BIOS, Dual Opteron 275, 8GB RAM, 1.02.2895, Tyan Thunder K8WE (S2895)) is to set the following in BIOS: * Set Operating System to "Linux" * Hammer Configuration->Memory Hole->IOMMU set to Enable * Hammer Configuration->MTRR mapping set to "Discrete" No idea why this fixes it, nor why it wasn't necessary before, but it at least boots now. It hangs in a pretty cryptic way on a default config kernel (well, Ubuntu Dapper defaults) so it would be nice if this was resolved. -- Alex Bligh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/