From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262047AbTDXJUR (ORCPT ); Thu, 24 Apr 2003 05:20:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262426AbTDXJUR (ORCPT ); Thu, 24 Apr 2003 05:20:17 -0400 Received: from [63.246.199.14] ([63.246.199.14]:8839 "EHLO ns.briggsmedia.com") by vger.kernel.org with ESMTP id S262047AbTDXJUQ convert rfc822-to-8bit (ORCPT ); Thu, 24 Apr 2003 05:20:16 -0400 Content-Type: text/plain; charset=US-ASCII From: joe briggs Organization: BMS To: Alan Cox Subject: Re: [Motion] Re: IDE corruption during heavy bt878-induced interr upt load [LKM] Date: Thu, 24 Apr 2003 06:31:49 -0400 User-Agent: KMail/1.4.3 Cc: David Brodbeck , "'motion@lists.frogtown.com'" , andras@t-online.de, Linux Kernel Mailing List , motion@frogtown.com References: <200304231813.46892.jbriggs@briggsmedia.com> <1051135875.2062.101.camel@dhcp22.swansea.linux.org.uk> In-Reply-To: <1051135875.2062.101.camel@dhcp22.swansea.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Message-Id: <200304240631.49222.jbriggs@briggsmedia.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org That's what I thought, which is why I suspected that the underlying problem might be related to the scope and completeness of the hardware arbitration. 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? On Wednesday 23 April 2003 06:11 pm, Alan Cox wrote: > On Mer, 2003-04-23 at 23:13, joe briggs wrote: > > Is this true??? Does onboard IDE controllers appear and work the same way > > as IDE or PCI controllers with respect to IRQ, DMA, and memory access? > > They appear to. Most of them nowdays are wired directly to the > north/southbridge link for performance. > > - > 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/ -- Joe Briggs Briggs Media Systems 105 Burnsen Ave. Manchester NH 01304 USA TEL/FAX 603-232-3115 MOBILE 603-493-2386 www.briggsmedia.com