From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263824AbTDXToa (ORCPT ); Thu, 24 Apr 2003 15:44:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263754AbTDXToa (ORCPT ); Thu, 24 Apr 2003 15:44:30 -0400 Received: from pc2-cwma1-4-cust86.swan.cable.ntl.com ([213.105.254.86]:11652 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S263824AbTDXTo2 (ORCPT ); Thu, 24 Apr 2003 15:44:28 -0400 Subject: Re: [Motion] Re: IDE corruption during heavy bt878-induced interr upt load [LKM] From: Alan Cox To: joe briggs Cc: David Brodbeck , "'motion@lists.frogtown.com'" , andras@t-online.de, Linux Kernel Mailing List , motion@frogtown.com In-Reply-To: <200304240631.49222.jbriggs@briggsmedia.com> References: <200304231813.46892.jbriggs@briggsmedia.com> <1051135875.2062.101.camel@dhcp22.swansea.linux.org.uk> <200304240631.49222.jbriggs@briggsmedia.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Organization: Message-Id: <1051210647.4017.20.camel@dhcp22.swansea.linux.org.uk> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.2 (1.2.2-5) Date: 24 Apr 2003 19:57:28 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Iau, 2003-04-24 at 11:31, joe briggs wrote: > Specifically, if a PCI board is DMA'ing a block of data to main memory, how > is the operation of the direct-connect IDE device impacted? When most PCI > devices transfer data to main memory, don't they arbitrate the bus, become > master, and blast it accross in chunks? Doesn't onboard IDE (legacy?) use > the DMA controller (8237 derivate I gues) to transfer? Onboard legacy mode IDE doing PCI DMA is doing it directly. How onboard and southbridge IDE interact is a complicated field and chipset dependant.