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Date: Tue, 27 May 1997 13:06:51 +0200
From: Stefan Esser <se@FreeBSD.ORG>
To: Marc Slemko <marcs@znep.com>
Cc: Dave Huang <khym@bga.com>, freebsd-scsi@FreeBSD.ORG,
        current-users@netbsd.org
Subject: Re: ncr driver working well with 53c875?
References: <Pine.BSI.3.96.970526170647.9159A-100000@urchin.bga.com> <Pine.BSF.3.95.970526213857.9988A-100000@alive.znep.com>
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In-Reply-To: <Pine.BSF.3.95.970526213857.9988A-100000@alive.znep.com>; from Marc Slemko on Mon, May 26, 1997 at 09:45:54PM -0600
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On May 26, Marc Slemko <marcs@znep.com> wrote:
> I have run both a DC-390U (ultra) and a DC-390F (ultra wide) under FreeBSD
> without any real problems.  The U isn't wide, but still uses the 875
> chipset. 
> 
> Note that the Tekram's BIOS doesn't like disks partitioned using FreeBSD's
> dedicated mode and will hang on boot if it sees one.  

Well, it will write a nasty complaint, and will pause for
some 10 seconds, but will eventually continue the SCSI bus
scan ...

> The only problem I had was when attaching a wide drive to the narrow
> controller (390U) , the code kept thinking it could talk over a wide bus
> (the chip on the contoller is a 875, which is wide, the drive is wide, but
> the connection is narrow) and blew up horribly.  To work around this I
> just used the appropriate define to force the NCR driver to only talk
> narrow. 

There is not much that can be done about the problem of 
WIDE drives connected to a WIDE host adapter with an 8bit
SCSI cable. The driver should fall back to non-WIDE mode
if WIDE transfers fail because of the cable, but I have 
never tested that feature.

One more point for the ToDo list ... :)

Regards, STefan