Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!hellgate.utah.edu!uplherc!wicat!meph!gsarff
From: gsarff@meph.UUCP (Gary Sarff)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: 32bit DMA lockups (Was: More info on A2091 woes)
Message-ID: <00077@meph.UUCP>
Date: 12 Feb 91 22:28:13 GMT
References: <555376@neabbs.UUCP>
Reply-To: gsarff@meph.UUCP
Organization: WICAT Systems Inc., Orem Utah
Lines: 44

In article <555376@neabbs.UUCP>, ajbrouw@neabbs.UUCP (ALBERT-JAN BROUWER) writes:
>
>Hey CBM, this message is worth a CAT-Scan or two :-). If you know about
>the problem I'm about to describe please comment. I would like know
>whether the problem is actually being addressed.
>
>Gregory Travis wrote:
>> Here is some more information for Commodore/Randell.  As I posted before
>> and as Randell suggested, turning off reselection on the A2091 with
>> 5.92 ROMS and the WD "A" chip is NOT sufficient to avoid the lockup
>> problem.  First of all, my configuration:
>>
>>	1 A2500/30 with 4 Meg of 32-Bit RAM
>>	1 A2091 with ROM V5.92 and the WD "A" chip.  2 Meg of 16-bit RAM
>>	  on the board.
>> etc. etc.
>
>I think you might be suffering from two separate problems here Gregory.
>The 2091 WD reselection thing has been highlighted sufficiently I think.

I have been seeing messages about this and am curious.  Am I correct in
assuming that the WD "A" chip is the WD3393A?  The reason I am asking is
because I have been in the process of modifying our scsi driver, that
previously worked with NCR boards, Adaptec boards, and our own controller
based on the WD3393 chip.  I did have to do some modifications to our
driver, though they were fairly minor as such things go.  I am wondering if
it is the consensus here, among users, developers, or CATS people, or any
combination thereof, that the "reselection" problem is the fault of the
WD3393A chip or is some problem with the 2091 controller board itself
and/or its interaction with the WD3393A chip.  Our driver does do
disconnect/reconnect selection and seems to be working fine so far, I have
just finished testing it with 1 Archive Viper 150Meg scsi tape, 2 Wren VII
1.2 Gig SCSI, 2 Wren VI, 702 Megs, a Wren IV (I think) 182 Meg, and a
seagate ST251, all being read from and written to simultaneously, and have
not noticed any problems occuring, BUT, I am not doing this on an amiga,
but on our own machines that we make, multibus Moto-680x0 based machines.
I do have an amiga 2000 though and thought I would post since I did not
like the sound of some of the things I have been hearing about peoples
problems, re: the new A chip.  Thanks


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