From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [PATCH] amd74xx: don't configure udma mode higher than BIOS did Date: Mon, 05 Feb 2007 18:32:11 +0300 Message-ID: <45C74DFB.5030703@ru.mvista.com> References: <20070205075836.GG1625@htj.dyndns.org> <20070205112410.5a3c3182@localhost.localdomain> <45C72012.7050605@gmail.com> <20070205132247.6f611e3c@localhost.localdomain> <45C73A3E.6080700@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from homer.mvista.com ([63.81.120.155]:15665 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S932965AbXBEPcS (ORCPT ); Mon, 5 Feb 2007 10:32:18 -0500 In-Reply-To: <45C73A3E.6080700@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Alan , bzolnier@gmail.com, linux-ide@vger.kernel.org Tejun Heo wrote: > CK804 IDE, at least mine, reports 80c in a lot of cases where it > shouldn't. I dunno the reason but it also makes drives confused about > cable type. Maybe it has the wrong capacitor attached or something. > This is A8N-E from ASUS, probably one of the popular ones using nf4. > When that happens, libata EH does its job and slows the interface to > udma33 after quite a few error messages. On IDE, if this happens, the > drive is put into PIO mode making the machine painful to use. Why? The old IDE core should just be downgrading UDMA to a speed where it starts working (i.e. 44 or 33 MB/s usually). MBR, Sergei