From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: 2.6.20 libata cdrom Date: Tue, 01 May 2007 09:24:42 -0400 Message-ID: <46373F9A.9020705@rtr.ca> References: <20070427175205.GD7809@electro-mechanical.com> <4635C35D.1020807@gmail.com> <20070430202107.GF5942@electro-mechanical.com> <4636C2C7.8090206@gmail.com> <20070501121703.GH5942@electro-mechanical.com> <46373AEE.6070908@rtr.ca> <20070501131818.GA18521@electro-mechanical.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([64.26.128.89]:2290 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030192AbXEANYp (ORCPT ); Tue, 1 May 2007 09:24:45 -0400 In-Reply-To: <20070501131818.GA18521@electro-mechanical.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: William Thompson Cc: Mark Lord , Tejun Heo , linux-kernel@vger.kernel.org, IDE/ATA development list , albertcc@tw.ibm.com William Thompson wrote: > > The one thing I do know, the machine with the non-working libata cdrom also > does not work with the ide driver *ONLY IF* DMA is turned on. That's probably because it's a mdma2 device, and not many chipsets seem to do mdma2 correctly. I had a drive like that around here, too. It could do dma on only one motherboard out of our half dozen or so. But libata might actually be able to use mdma2 with it, as I believe (unsubstantiated) that Alan may have done a better implementation of setting the timings than what we had with our old IDE drivers. Cheers