mesh SCSI bus locks hard on 7500 when burning a CD-R in dao mode

[Michael Schmitz]

> > The big question: why does this particular command time out in the first
> > place? Does the target expect more data to be sent? Does the target just
> > crash and fails to release the bus? It seems to work on other host
> > adapters, doesn't it?
>
> There's a report of excatly the same failure mode on mac53c94 with a
> different brand (Sony, as opposed to Yamaha on my MESH) of DVD drive.

Please send a detailed description on how to reproduce this bug by PM.
I'll try to look into that on my Lombard, and in case I can get the
required binaries for m68k I'd also test on an old Quadra with 53c9x
SCSI.

Does the bug happen only with DVD writers, or regular CD writers?

> So the only points in common seem to be that the DVD drives are running
> on mac hardware and that the drivers are written by Paul Mackerras.  :-)
> I don't at all mean to impugn Paul's coding ability, which is obviously
> excellent, but the fact that he wrote both the drivers may mean that
> they share lots of code and possibly share the same bug.

If so, the bug should have propagated to the m68k 53c9x driver. Wouldn't
be the 53c9x first weirdness - I never got it to accept a DAT drive (old
DDS-1, possibly Apple) without blowing up.

It might be something PPC specific as well and have nothing to do with
Paul's drivers.

	Michael


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