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 19:44:07 +0300 Message-ID: <4B0EB057.10301@ru.mvista.com> References: <20091125170218.5446.13513.sendpatchset@localhost> <200911261640.39208.bzolnier@gmail.com> <4B0EA9FC.1000208@ru.mvista.com> <200911261729.46700.bzolnier@gmail.com> 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]:24722 "HELO imap.sh.mvista.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1755851AbZKZQnJ (ORCPT ); Thu, 26 Nov 2009 11:43:09 -0500 In-Reply-To: <200911261729.46700.bzolnier@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Bartlomiej Zolnierkiewicz Cc: Alan Cox , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Bartlomiej Zolnierkiewicz wrote: >>>>>>>>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? >>>Me too? I just have what 'The Good Uncle Google' has.. >> Well, I've googled for it and was unable to find any valid links even to >>my preliminary version anymore. Perhaps I haven't looked hard enough... > Maybe... ;) > FWIW my file is called 38384_SMSC_SLC90E66.pdf Well, that brought me to some Chinese site with 07/10/2002 version (which I've already found minutes before that). But it still claims support for MWDMA0 under the features... ah, I need to look further down... no "programming guide" part, hm... but thanks anyway. :-) > -- > Bartlomiej Zolnierkiewicz WBR, Sergei