From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933046AbYEIR17 (ORCPT ); Fri, 9 May 2008 13:27:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758435AbYEIR1a (ORCPT ); Fri, 9 May 2008 13:27:30 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:59555 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757002AbYEIR1Z (ORCPT ); Fri, 9 May 2008 13:27:25 -0400 Date: Fri, 9 May 2008 10:26:47 -0700 (PDT) From: Linus Torvalds To: Gary Hade cc: Ingo Molnar , Jesse Barnes , Dave Airlie , kernel list , Thomas Gleixner Subject: Re: regression fixed by using pci=rom In-Reply-To: <20080509164551.GB6255@us.ibm.com> Message-ID: References: <21d7e9970805081654h6de38d58q5ad3b6d3520b45f1@mail.gmail.com> <200805081717.54102.jbarnes@virtuousgeek.org> <20080509064402.GA15754@elte.hu> <20080509164551.GB6255@us.ibm.com> User-Agent: Alpine 1.10 (LFD 962 2008-03-14) 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 On Fri, 9 May 2008, Gary Hade wrote: > > Ingo, Would you (or others listening to this discussion) know > exactly what Windows does with respect to BIOS unassigned > expansion ROMs? Nobody really seems to know what windows does for *any* resources. And it probably depends on windows version too, and on detailed chipset issues (ie does Windows do the same thing as Linux wrt transparent bridges that still have bus translation resources set up?). So the "try to do what Windows does" is something we strive for in particular cases, but it's not an absolute thing, and probably can never even be that in theory. It's more a guideline, especially when we don't know which particular choice is better and both seem otherwise equally good. But "doesn't work" always trumps "that's what windows does". Because even if something works under Windows, sometimes Linux drivers simply then act differently (ie they may use PIO vs MMIO, or in the case of graphics they may need ROMs for re-POST'ing while a windows driver is written by the chipset vendor and DTRT without even looking at the BIOS tables) Linus