From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756516AbYCZWte (ORCPT ); Wed, 26 Mar 2008 18:49:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753816AbYCZWtZ (ORCPT ); Wed, 26 Mar 2008 18:49:25 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:49102 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753575AbYCZWtY (ORCPT ); Wed, 26 Mar 2008 18:49:24 -0400 Date: Wed, 26 Mar 2008 15:47:03 -0700 (PDT) From: Linus Torvalds To: Benjamin Herrenschmidt cc: Ingo Molnar , Ivan Kokshaysky , Gary Hade , Thomas Meyer , Stefan Richter , Thomas Gleixner , "Rafael J. Wysocki" , LKML , Adrian Bunk , Andrew Morton , Natalie Protasevich , pm@debian.org Subject: Re: [patch] pci: revert "PCI: remove transparent bridge sizing" In-Reply-To: <1206570546.6926.30.camel@pasglop> Message-ID: References: <20080326101450.GA9060@jurassic.park.msu.ru> <20080326135458.GA27621@elte.hu> <20080326180701.GA6249@us.ibm.com> <20080326203012.GB6249@us.ibm.com> <20080326205828.GA15225@jurassic.park.msu.ru> <1206568675.6926.7.camel@pasglop> <20080326221027.GA7959@elte.hu> <1206570546.6926.30.camel@pasglop> User-Agent: Alpine 1.00 (LFD 882 2007-12-20) 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 Thu, 27 Mar 2008, Benjamin Herrenschmidt wrote: > > I was talking about IO not memory mostly here. Yeah, low IO is also reserved on PC's (the low 256 IO ports are motherboard resources and contain stuff like legacy DMA channel setup etc). You could imagine having it behind a PCI bridge, but in practice it's always on the NB/SB (and if you want to support some of the odder things like the NMI reason and the i387 error ports, they pretty much have to be - it would be insane to make a special PCI chips on a separate bus that does things like that). Linus