Re: A3000 and UVM

[David Hopper <dhop%nwlink.com@localhost>]

Thanks, I'll look into this.  The only possible termination issue I have with 
this bus is
that I've plugged one end of the wide bus directly into the Cyberstorm, instead 
of
chaining it along to an active terminator.  I had assumed (always a bad thing 
to do) that
the 770 auto-terminated (but now that I think of it, that's a function of the 
controller
card, not the chip).

Thanks,
dave

Ignatios Souvatzis wrote:

> On Wed, Sep 15, 1999 at 01:34:26AM -0700, David Hopper wrote:
> >
> > Problem Two:  In trying to isolate the problem (and looking forward to
> > installing a new toy), I upgraded the whole kit to a Cyberstorm PPC 
> > 233/'060,
> > and added an additional 32 megs.  I had compiled and installed an '060 and
> > Cyberstorm SCSI kernel beforehand, but I saw uvm_faults even more 
> > frequently,
> > with getty, inetd, and others coring into the root.
> >
> > I then started from scratch on the Cyberstorm with Ignatios' installation
> > kernel, and it fails at random points in the installation script with 
> > either a
> > segmentation fault and a lockup, or a uvm_fault dump.  This is all on one 
> > single
> > memory segment.
>
> Are you using a disk on the cyberstorm scsi or on the internal scsi?
> Either way: are you sure the cable and termination are ok?
> Sure as in "I looked at every mm of the cable and checked every device
> connected to it, and found no termination but at the two ends of the longest
> path, and I didn't build an Y cable.".
>
> Yes, it might seem strange that this acts differently depending on how much
> memory is used, but I can't rule this out (different DMA timing!)
>
> Regards,
>         -is