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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


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