On Sun, 24 Dec 2000, Peter Seebach wrote:
> I may go looking. I have a passel of '875 cards that *don't* work, for
> one reason or another. The symptom is, the card "probes" (it is identified
> by the SRM console as an '875 rather than getting only product/vendor ID), but
> the SRM console doesn't think there's any devices on it, not even a SCSI
> bus.
Here are reasons that, IMO, may explain this behaviour:
1) Clock doubler assumed by SRM but not present, or the opposite,
or strange SCSI clock frequency.
Normally, 875s rev. >= 2 support the doubler, but base SCSI clock
should be 40 MHz (you may check the frequency on the board).
2) SRM probing a SCSI differential BUS instead of Single Ended, or
the opposite.
The 875, unlike multi-mode capable chips (895, 896, 1010), does not
provide this information. SYMBIOS recommendation was to set GPIO3 for
HVD, but not all brands followed this recommendation.
I donnot see any other reason, unless the SRM actually doing something
very bad, and I would suspect reason 2 to be the cause of the problem.
Gérard.
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