From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031313AbXDZQYb (ORCPT ); Thu, 26 Apr 2007 12:24:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1031338AbXDZQYb (ORCPT ); Thu, 26 Apr 2007 12:24:31 -0400 Received: from terminus.zytor.com ([192.83.249.54]:56442 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031313AbXDZQYa (ORCPT ); Thu, 26 Apr 2007 12:24:30 -0400 Message-ID: <4630D116.4080202@zytor.com> Date: Thu, 26 Apr 2007 09:19:34 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.0 (X11/20070419) MIME-Version: 1.0 To: Lennart Sorensen CC: David Acker , "Kok, Auke" , Lennert Buytenhek , Jeff Garzik , Netdev List , Linux Kernel , Andrew Morton , Russell King Subject: Re: [RFT] e100 driver on ARM References: <44FC0261.6010807@garzik.org> <20060904123123.GB1285@xi.wantstofly.org> <460AF480.7050609@intel.com> <460B4BF2.1070803@roinet.com> <20070329141041.GA3510@csclub.uwaterloo.ca> <46239138.4040408@roinet.com> <20070417173507.GB5575@csclub.uwaterloo.ca> In-Reply-To: <20070417173507.GB5575@csclub.uwaterloo.ca> 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 Lennart Sorensen wrote: > > My suspicision (although it is only that) is that the PXA255 trying to > access memory may cause interruptions in PCI bus master transfers, which > is of course not permitted by the PCI spec (at least the way I read it). Why wouldn't that be permitted? It, in fact, happens all the time (the host bridge withdraws the GNT# line and raises STOP#, which does a Termination With Data of the bus transfer.) This is a normal event and if you can't handle it you won't work with many host bridges at all. -hpa