From owner-freebsd-bugs  Wed Jan 29  6:25:56 2003
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Date: Wed, 29 Jan 2003 06:25:53 -0800 (PST)
From: "James J. Ramsey" <jjramsey_6x9eq42@yahoo.com>
Reply-To: jjramsey@pobox.com
Subject: Re: Revisiting the semirandom bug/issue in FreeBSD's ATA querying
To: freebsd-bugs@freebsd.org
In-Reply-To: <20030129015852.GB1989@HAL9000.homeunix.com>
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--- David Schultz <dschultz@uclink.Berkeley.EDU>
wrote:
> Thus spake James J. Ramsey
> <jjramsey_6x9eq42@yahoo.com>:
> > --- "Wojciech S. Czarnecki" <ohir@sec.pl> wrote:
> > > James J. Ramsey wrote:
> > > [on Thu, Jan 23, 2003 at 05:01:05PM -0800]
> > > (>) Owego dnia James J. Ramsey napisał(a):
> > > > ad0: 8866663634010175MB
> > > > <?U}O|U}!~IEzA~M~!|M~1.5?!?!~!~!?!?!~!?!>
> > > > [16955114026566160/17/63] at ata0-master PIO4
> > > Check cables twice. 
> > > For the test: change cable to ATA33 (40wire)
> cable.
> > 
> > I did this and could not get FreeBSD to fail. The
> > kernel messages were nice and healthy-looking:
> > 
> > ad0: DMA limited to UDMA33, non-ATA66 cable or
> device
> > ad0: 19595MB <QUANTUM FIREBALLP LM20.5>
> [39813/16/63]
> > at ata0-master UDMA33
> > 
> > (The hard drive was primary master, and my CD-ROM
> > primary slave.)
> 
> That's absolutely bizarre.  So the problem happens
> *only* on
> FreeBSD, and only when you use bad cables *and* have
> two devices
> on the controller.  Well, thanks for being patient
> about it.

I'm not so sure the cables are even bad. I've tried
two different ATA66 cables and can reproduce the
problem using either one of them. I doubt that *both*
of them are bad.

On the bright side, the problem seems to be narrowed
down some. :)

Sidenote: After actually *seeing* an ATA33 cable, I
can tell that both the cables I had been using (before
doing my most recent test) were for ATA66. I hadn't
realized before that the difference between an ATA33
and an ATA66 cable was so obvious (I found out that
ATA33 cable wires are fatter.)


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