From owner-freebsd-questions Wed Oct 23 16:24: 4 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EFE5F37B401 for ; Wed, 23 Oct 2002 16:24:02 -0700 (PDT) Received: from pursued-with.net (adsl-66-125-9-242.dsl.sndg02.pacbell.net [66.125.9.242]) by mx1.FreeBSD.org (Postfix) with ESMTP id 712A343E4A for ; Wed, 23 Oct 2002 16:24:02 -0700 (PDT) (envelope-from Kevin_Stevens@pursued-with.net) Received: from babelfish (babelfish [192.168.168.42]) by pursued-with.net (8.12.6/8.12.5) with ESMTP id g9NNNxIC011311; Wed, 23 Oct 2002 16:23:59 -0700 (PDT) (envelope-from Kevin_Stevens@pursued-with.net) Date: Wed, 23 Oct 2002 16:23:59 -0700 (PDT) From: Kevin Stevens Reply-To: Kevin_Stevens@pursued-with.net To: "Jack L. Stone" Cc: lewiz , Steve Warwick , Subject: Re: UDMA limited to 33 - resolution In-Reply-To: <3.0.5.32.20021023180249.00e357f8@mail.sage-one.net> Message-ID: <20021023161917.H11289-100000@babelfish.pursued-with.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Wed, 23 Oct 2002, Jack L. Stone wrote: > At 11:04 PM 10.23.2002 +0100, lewiz wrote: > >Hi, > > > > Afaik, UDMA100 is only supported if there is just one device on the > >channel. Feel free to shoot me if I am incorrect, which is quite > >possible. Just double-check by asking Google or something - but I have > >a gut feeling this may be the case. That is not correct: ad0: 57241MB [116301/16/63] at ata0-master UDMA100 ad1: 78533MB [159560/16/63] at ata0-slave UDMA100 > BANG!! The CDROM is on the same channel as ad2: > > ad0: 76319MB [155061/16/63] at ata0-master UDMA100 > ad2: 38166MB [77545/16/63] at ata1-master UDMA100 > acd0: CDROM at ata1-slave PIO4 However, it *is* correct that all devices on a UDMA channel must support UDMA, so yes, the above is a problem. I don't recall if all devices must also be the same UDMA speed (66/100/133) or not, bbelieve that is true too. This is not a BSD issue, it is part of the UDMA spec. KeS To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message