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From: bob@kenobi.pmr.com (Bob Willcox)
Subject: Re: NCR825 controller with Fujitsu M2915-Q SCSI2 drive
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References: <32340C37.3251@westlake.com>
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Date: Wed, 18 Sep 1996 02:07:33 GMT
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In article <32340C37.3251@westlake.com>,
Ray Cromwell <ray@westlake.com> writes:
> Hi, could anyone help me with the following problem. I'm trying to
> use a 2.1 gig Fujitsu SCSI-2 drive in WIDE and FAST mode with
> FreeBSD using a NCR825 based PCI SCSI-2 card. The problem is this:
> The Fujitsu operates in WIDE mode as SCSI device number 15. However,
Why can't you change the SCSI ID of the drive to something from
0 to 6? Its hard for me to imagine that Fujitsu has forced it
to be 15 (I know of no SCSI device that does so).
> looking at the source code to the NCR driver I see that it has
> an assertion that forces the drive number to range from 0 to 7. Whenever
> the system tries to access the drive, I get the following
> errors:
>
[ kernel messages snipped ]
>
> Does anyone have any recommendations? I don't think the drive
> will work in fast mode with a SCSI device number < 8. And I'd rather
> not run it as a normal SCSI-1 drive.
Are you certain of this? As far as I understand, the only thing
special about the upper IDs is that they are lower in priority and
*only* work on a wide SCSI bus with wide devices. All of my wide
disks work fine on the lower IDs (to which they are all set).
>
> I was thinking about hacking the ncr driver to remove the
> restrictions, but I'm concerned that they were put there for
> a reason.
I am not sufficiently familiar with the NCR device driver in FreeBSD
to comment on why it would be restricted to just the low SCSI IDs,
but unless you want more than 6 devices on your SCSI bus or you
have some other unusual requirement, I can see no particular reason
for using the higher IDs either.
>
> This problem occurs on 2.1, 2.1.5, and the lastest 2.2 SNAP.
>
> -Ray
--
Bob Willcox politics, n:
bob@luke.pmr.com A strife of interests masquerading as a contest of
Austin, TX principles. The conduct of public affairs for private
advantage. -- Ambrose Bierce