From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 3 Aug 2001 03:14:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 3 Aug 2001 03:14:17 -0400 Received: from ebiederm.dsl.xmission.com ([166.70.28.69]:46146 "EHLO flinx.biederman.org") by vger.kernel.org with ESMTP id ; Fri, 3 Aug 2001 03:14:02 -0400 To: Alan Cox Cc: pgallen@randomlogic.com (Paul G. Allen), linux-kernel@vger.kernel.org (linux-kernel@vger.kernel.org) Subject: Re: SMP possible with AMD CPUs? In-Reply-To: From: ebiederm@xmission.com (Eric W. Biederman) Date: 03 Aug 2001 01:07:42 -0600 In-Reply-To: Message-ID: User-Agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.5 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Alan Cox writes: > > 3. The BIOS (apparently) doesn't setup the MTRR properly on both CPUs making > mtrr bitch about a mismatch. > > > The mtrr driver fixups should cure that - its a common bios bug. There is some truth in that. But note AMD hasn't released all of the documentation related to their MTRR's so we can't rely on linux fixing all of those BIOS bugs. In this case it happens to be different caching on the BIOS chip, from different cpus. An interesting question is what is 0x1e in the AMD fixed mtrr's. Eric