Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755277AbZAUXiS (ORCPT ); Wed, 21 Jan 2009 18:38:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752934AbZAUXiC (ORCPT ); Wed, 21 Jan 2009 18:38:02 -0500 Received: from h155.mvista.com ([63.81.120.155]:5686 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752767AbZAUXiA (ORCPT ); Wed, 21 Jan 2009 18:38:00 -0500 Message-ID: <4977B1D1.2010305@ru.mvista.com> Date: Thu, 22 Jan 2009 02:37:53 +0300 From: Sergei Shtylyov User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 To: Sergei Shtylyov Cc: Alan Cox , Mikael Pettersson , Hugh Dickins , Jeff Garzik , "Rafael J. Wysocki" , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: 2.6.29-rc libata sff 32bit PIO regression References: <18807.33113.550070.329912@harpo.it.uu.se> <20090121214746.2b15d1de@lxorguk.ukuu.org.uk> <4977A6E5.6080506@ru.mvista.com> <20090121225808.1f5ffac1@lxorguk.ukuu.org.uk> <4977B10B.5050904@ru.mvista.com> In-Reply-To: <4977B10B.5050904@ru.mvista.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1457 Lines: 43 Hello, I wrote: >>>>> > I've a Dell Precision 670 here (four-year-old EM64T Xeon with >>>>> ata_piix) >>>>> > which doesn't like your commit >>>>> 871af1210f13966ab911ed2166e4ab2ce775b99d >>>>> > libata: Add 32bit PIO support. Full dmesg (and .config) >>>>> attached, but >>>>> > here's an extract showing the start of the error messages on ata2: >>>>> >>>> Cool - so we need two different 32bit PIO methods - at least >>>> according to >>>> the docs for the AMD we should use entirely 32bit I/O there. Fun fun >>>> >>> Could you refer me to the exact AMD doc that requires that? >>> >> >> AMD762 page 82, under DevB:1x40 bit 14 and bit 12 >> > > What exactly AMD-762 document has this? I'm not seeing it in either > stasheet ot software/BIOS design guide. Besides, AMD-762 is a north > bridge and doesn't include IDE. Finally found it in the AMD-768 datasheet. >> "Note: only 32-bit writes to the data port are allowed when this bit is >> set." >> > > Now tell me who forces you to set that bit (I assume it's the write > buffer enable) for the ATAPI devices? Yes, it's the write buffer enable (about which I have written already). \ MBR, Sergei -- 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/