From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 22 May 2007 23:07:41 +0200
To: 9fans@cse.psu.edu
Subject: Re: [9fans] sd53c8xx: bios scntl3(00) stest2(00)
Message-ID: <20070522210741.GA5310@mercurius.galaxy>
References: <20070521205043.GA14281@mercurius.galaxy>
	<9158.1179792984@lunacy.ugrad.cs.cmu.edu>
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From: frank@inua.be (Frank Lenaerts)
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On Mon, May 21, 2007 at 08:16:24PM -0400, Dave Eckhardt wrote:
> I am successfully using one of those cards on my
> fossil server.  It emits that message every time
> it boots (the last time it booted the values were
> 00 and 00; I can't claim they are every time).
> 
> If I can be of use in debugging, let me know...
> I should have time starting Wednesday.
> 
> Have you checked that your SCSI bus is terminated?

As this system has always been running Debian GNU/Linux, I would say
yes.

Nevertheless, I also checked the user manual of the card and found out
that I should actually use the special twisted pair ribbon cable with
a SCSI terminator (LVD) to use Ultra2 SCSI (my disks are U2W) instead
of the flat cable (SE) which is only for Ultra/Wide SCSI.

I didn't know there was a difference between the 2 cables and used the
flat cable (having 3 connectors) as the machine only has 2 SCSI disks
anyway (so all 3 connectors would be used). The ribbon cable would
have connectors left over: it has 6 connectors: 1 for the controller,
1 for an LVD terminator and 4 for disks. I always thought that the 2
unused connectors would leave the SCSI bus open.

After switching the cables (not the connector), the Linux on the
harddisk worked as before (with no noticable difference but I didn't
investigate throughput or so any further). The Plan 9 CD didn't get
any further however.

> Dave Eckhardt

-- 
Frank Lenaerts ---------------------------------------- frank@inua.be