From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported Date: Thu, 26 Nov 2009 18:33:13 +0300 Message-ID: <4B0E9FB9.8050508@ru.mvista.com> References: <20091125170218.5446.13513.sendpatchset@localhost> <20091125170415.5446.15073.sendpatchset@localhost> <20091125172552.6817e3da@lxorguk.ukuu.org.uk> <200911261553.58941.bzolnier@gmail.com> <20091126151546.6c891014@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from gateway-1237.mvista.com ([206.112.117.35]:41666 "HELO imap.sh.mvista.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1752690AbZKZPcQ (ORCPT ); Thu, 26 Nov 2009 10:32:16 -0500 In-Reply-To: <20091126151546.6c891014@lxorguk.ukuu.org.uk> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Bartlomiej Zolnierkiewicz , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Hello. Alan Cox wrote: >>On Wednesday 25 November 2009 06:25:52 pm Alan Cox wrote: >>>On Wed, 25 Nov 2009 18:04:15 +0100 >>>Bartlomiej Zolnierkiewicz wrote: >>>>From: Bartlomiej Zolnierkiewicz >>>>Subject: [PATCH] pata_efar: MWDMA0 is unsupported >>>>MWDMA0 timings cannot be met with the PIIX based controller >>>>programming interface. >>>The efar documentation makes no reference to not being capable of MWDMA0, >>>so where does this come from ? No MWDMA0 is an Intel erratum it appears. >>No MWDMA0 support is a common issue on all 'PIIX-like' controllers. >>In case of this chipset while the (preliminary) documentation claims MWDMA0 >>support on the 'FEATURES' page the later 'programming guide' part describes >>only PIO0-4, SWDMA2, MWDMA1-2 and UDMA0-4 transfer modes as supported. > Cool - I only have the original docs. Hm, me too... perhaps worth putting in Jeff's documentation archive? MBR, Sergei