Date: Wed, 23 Oct 2002 16:23:59 -0700 (PDT) From: Kevin Stevens <Kevin_Stevens@pursued-with.net> To: "Jack L. Stone" <jackstone@sage-one.net> Cc: lewiz <purple@lewiz.info>, Steve Warwick <ukla@attbi.com>, <freebsd-questions@FreeBSD.ORG> Subject: Re: UDMA limited to 33 - resolution Message-ID: <20021023161917.H11289-100000@babelfish.pursued-with.net> In-Reply-To: <3.0.5.32.20021023180249.00e357f8@mail.sage-one.net>
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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 <ST360021A> [116301/16/63] at ata0-master UDMA100 ad1: 78533MB <IC35L080AVVA07-0> [159560/16/63] at ata0-slave UDMA100 > BANG!! The CDROM is on the same channel as ad2: > > ad0: 76319MB <ST380021A> [155061/16/63] at ata0-master UDMA100 > ad2: 38166MB <ST340016A> [77545/16/63] at ata1-master UDMA100 > acd0: CDROM <FX5401W> 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
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