*BSD News Article 29717


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Newsgroups: comp.os.386bsd.development
Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!hookup!swrinde!cs.utexas.edu!uunet!world!hd
From: hd@world.std.com (HD Associates)
Subject: Re: SCSI processor target mode implemented?
Message-ID: <CoB81n.4tD@world.std.com>
Organization: The World Public Access UNIX, Brookline, MA
References: <1994Apr13.133015.7424@unibw-hamburg.de>
Date: Fri, 15 Apr 1994 16:48:58 GMT
Lines: 53

In article <1994Apr13.133015.7424@unibw-hamburg.de>,
Jens-Peter Akelbein <e_akel@unibw-hamburg.de> wrote:
>Hi!
>
>I'm interested in SCSI as a data link between two PC's running
>FreeBSD. I've found some hints in the sources that is it possible
>to implement support for the mode. Has somebody already done it?
>What information do I need to implement support? I've the sources
>of the libsu library that allows user access to SCSI-devices.
>I think it must be possible to write the extensions for the
>processor device target mode.
>
>I've the Adaptec 1542cf SCSI-Adapter. Does it support the target
>mode? Is there anybody out there that has tried/implemented the
>code for this adapter are another one?
>
>my email address: e_akel@unibw-hamburg.de
>
>thanks
>      Jens-Peter

I implemented it.  I have never brought it up to date with Julian's second
release, and for good reason:  I am only sure it works on the 1542B,
I know it doesn't work on the 1542C with early firmware and I don't know
if it has been fixed.  It also kind-of-works on the 1740 with custom
firmware from Adaptec.  The 1740 interface is completely different from
the documented one in the 1740 tech ref manual.

Adaptec DOES NOT SUPPORT TARGET MODE ON ANY OF ITS' HOST ADAPTERS.

This is a Adaptec's formal position.  They do not test it and they
will not fix the firmware.  They shafted a client who was going to
embed the 1740 in a several hundred / year product.  The client
selected the 1740 on Adaptec's recommendation.  They dragged their
feet for months and then finally said they will not support or fix
the firmware related to target mode.

The client instead bought an OEM board from NCR and wrote their own
scripts for the NCR scsi chip.  They are only now finishing that up,
7 months after Adaptec pulled the plug on their 1740 efforts.

I do not know of any PC SCSI board with a supported processor target
mode.  I've made quite a few calls without luck.  If anyone locates
such a board let me know.

If you want my code I can send it, but again, it is relative to an
old release of Julian's drivers.

Peter
-- 
Peter Dufault               Real Time Machine Control and Simulation
HD Associates, Inc.         Voice: 508 433 6936
hd@world.std.com            Fax:   508 433 5267