Date: Sat, 25 Sep 2004 10:00:51 +1000 (EST) From: Andrew MacIntyre <andymac@bullseye.apana.org.au> To: Bruce Campbell <bruce@engmail.uwaterloo.ca> Cc: freebsd-hardware@freebsd.org Subject: Re: ata "fallback to PIO mode" on dual processor AMD systems Message-ID: <20040925095643.F44318@bullseye.apana.org.au> In-Reply-To: <1041532923.3e1487fb50a0e@www.nexusmail.uwaterloo.ca> References: <1041368236.3e1204ac45da5@www.nexusmail.uwaterloo.ca> <1041532923.3e1487fb50a0e@www.nexusmail.uwaterloo.ca>
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On Thu, 2 Jan 2003, Bruce Campbell wrote:
> I've manually set:
>
> atacontrol mode 0 UDMA33 UDMA33
>
> and the problem has not recurred.
That sort of hints that there's some issue with the cabling, as UDMA33 is
the highest you can go on a 40wire IDE cable. Going beyond requires an
80wire cable (& no longer than 450mm/18" as I recall).
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