From owner-freebsd-hardware Thu Apr 24 02:51:49 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id CAA27484 for hardware-outgoing; Thu, 24 Apr 1997 02:51:49 -0700 (PDT) Received: from hda.hda.com (hda-bicnet.bicnet.net [207.198.1.121]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id CAA27478 for ; Thu, 24 Apr 1997 02:51:46 -0700 (PDT) Received: (from dufault@localhost) by hda.hda.com (8.8.5/8.8.5) id FAA02994; Thu, 24 Apr 1997 05:38:12 -0400 (EDT) From: Peter Dufault Message-Id: <199704240938.FAA02994@hda.hda.com> Subject: Re: Yet another Adaptec 2940UW problem :( In-Reply-To: <3.0.1.32.19970423175524.006f61c4@lariat.org> from Brett Glass at "Apr 23, 97 05:55:24 pm" To: brett@lariat.org (Brett Glass) Date: Thu, 24 Apr 1997 05:38:11 -0400 (EDT) Cc: hardware@freebsd.org X-Mailer: ELM [version 2.4ME+ PL25 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > >You don't configure a > >pt device you configure an "sctarg" device. Getting a 1542 may be > >a way to prototype. > > Well, ultimately, the machine may be replicated a few hundred times, so I'd > like something I could use for "production" as well as prototyping. Is > there a reason (other than the bus interface) that the board might be > unsuited for production application? Expensive, old, and from Adaptec. Adaptec will not support documented features of their boards even after convincing an OEM to use a board in a product selling several hundred per year. The documented 17xx target operations are broken and buggy and won't be fixed, and I have a statement from Adaptec that they don't support target ops on any of their boards - ignore the documentation and anything you hear from pre-sales OEM marketing. I recommend that you stay FAR away from Adaptec's board side of the business - I'm sure their chip side is more OEM friendly. Now I remember that it is even worse - note that aha1542.c is only enabling target ops for the 1542B since the 1542C locks up the bus. Use a 1542B only to remove the lack of another adapter as a block in the software development path, and only use 16MB of memory if you do that. I strongly recommend the NCR where you'll have multiple vendors and control over the firmware. I wouldn't try the 1542 clones unless you can get a happy reference from a customer buying several hundred per year. Peter -- Peter Dufault (dufault@hda.com) Realtime Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936