Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765009AbXIMRWA (ORCPT ); Thu, 13 Sep 2007 13:22:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760603AbXIMRVf (ORCPT ); Thu, 13 Sep 2007 13:21:35 -0400 Received: from terminus.zytor.com ([198.137.202.10]:44800 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759349AbXIMRVc (ORCPT ); Thu, 13 Sep 2007 13:21:32 -0400 Message-ID: <46E97178.2040903@zytor.com> Date: Thu, 13 Sep 2007 10:20:56 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.0 (X11/20070419) MIME-Version: 1.0 To: Yinghai Lu CC: Andi Kleen , Greg KH , Andrew Morton , Jeff Garzik , Martin Mares , dean gaudet , Robert Richter , Linux Kernel Mailing List Subject: Re: [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is used References: <200709121921.43950.yinghai.lu@sun.com> <200709131147.43446.ak@suse.de> <20070913104704.GA3878@kroah.com> <200709131353.15752.ak@suse.de> <86802c440709131001w4b758921r52a23f1732a6e9c8@mail.gmail.com> In-Reply-To: <86802c440709131001w4b758921r52a23f1732a6e9c8@mail.gmail.com> X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 966 Lines: 23 Yinghai Lu wrote: > > BIOS guys also said that fam 10h need mmconfig via eax accessing, may > need OS do sth, so it is safe to stay with MCFG entry for SB like > mcp55... > > but latest kernel already have that workaround to make mmconfig via eax... > This is actually a good point. Since the CPU vendor managed to completely fuck up the operation of MMCONFIG itself on this CPU (it's a *MEMORY REFERENCE*, guys!), it is actually to be expected and prudent that BIOS vendors will drop the MCFG entry. MMCONFIG doesn't actually work on this CPU for any system software which doesn't already know to work around this particular piece of severe braindamage; standards-complicant MMCONFIG isn't supported at all. -hpa - 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/