Date: Thu, 24 Apr 1997 05:38:11 -0400 (EDT) From: Peter Dufault <dufault@hda.com> To: brett@lariat.org (Brett Glass) Cc: hardware@freebsd.org Subject: Re: Yet another Adaptec 2940UW problem :( Message-ID: <199704240938.FAA02994@hda.hda.com> In-Reply-To: <3.0.1.32.19970423175524.006f61c4@lariat.org> from Brett Glass at "Apr 23, 97 05:55:24 pm"
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> >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
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