From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 23 May 2002 18:41:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 23 May 2002 18:41:12 -0400 Received: from twilight.ucw.cz ([195.39.74.230]:39074 "EHLO twilight.ucw.cz") by vger.kernel.org with ESMTP id ; Thu, 23 May 2002 18:41:11 -0400 Date: Fri, 24 May 2002 00:40:57 +0200 From: Vojtech Pavlik To: Andre Hedrick Cc: Tomas Szepe , "Gryaznova E." , linux-kernel@vger.kernel.org Subject: Re: IDE problem: linux-2.5.17 Message-ID: <20020524004057.C27005@ucw.cz> In-Reply-To: <20020523180357.GA725@louise.pinerecords.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 23, 2002 at 11:44:44AM -0700, Andre Hedrick wrote: > > Not true at all. > > Many of the OEM's use 40c's to do 66 and 100, just they have to be very > high quality and about 6" in length. Hmm, last time we were discussing you were saying that only 80 wire cables work, and I was saying that short enough 40 wire cables are OK as well (even in some older revision of the spec) .... ... interesting. Anyway, 40 wire cables can really only work with a single drive and have to be really short. And, Linux should only use UDMA33 and lower on them, because it can't know the length of the cable. > > On Thu, 23 May 2002, Tomas Szepe wrote: > > > > I have 40 wires cable. When ide=nodma is passed to 2.5.17 kernel - > > > kernel boots. Am I correct that it is not possible to have DMA > > > on with such cable? Is there any reason for doing that? > > > > 40-conductor IDE cables are capable of transfering data > > in DMA modes up to udma2, but no faster. > > > > T. > > - > > 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/ > > > > Andre Hedrick > LAD Storage Consulting Group > > - > 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/ -- Vojtech Pavlik SuSE Labs