[rescue] howto make multiple main boards work on a Sun Sparc 670/MP

[Dave McGuire]

  Correct.  They only get power from the backplane in this
configuration.

     -Dave McGuire

On June 15, Kevin Loch wrote:
> Just to clarify, this allows them to coexist in the same VME backplane
> as separate machines, right?
> 
> KL
> 
> 
> "
> 
> Michael S. Schiller" wrote:
> > 
> > Would that be the 'skip-vme-loopback?' setting? Or is this another setting?
> > 
> > -Mike
> > 
> > Dave McGuire wrote:
> > 
> > >   You need to be running relatively new boot ROMs, though I don't
> > > recall which version in particular...if you do a "printenv" at the
> > > "ok" prompt and you see an option called "vme-loopback?" then you ROMs
> > > are new enough.  Set that option to "yes"...multiple boards can now
> > > coexist in the same backplane.  I've seen this done with up to four or
> > > five 4/600 boards in a 690 chassis.
> > >
> > >   UMD, eh?  I'm up Route 1 from you in Laurel.
> > >
> > >            -Dave McGuire
> > >
> > > On June 14, Rob wrote:
> > > >
> > > > Hi,
> > > >
> > > > I recently picked up a Sun 670/MP, and a spare cpu board, and it would be
> > > > really nifty if I could get them to both work at the same time.  From talking
> > > > to Wise People, it would seem that  I can't get them to work as one computer
> > > > with shared resources: is that correct?  If I read the FAQ correctly, I am
> > > > talking about two fully populated (4cpu, 128 mb) 501-1899 boards, but I can't
> > > > find the number on the boards to confirm the model number.
> > > >
> > > > If that is the case, I read in a different FAQ something about being able to
> > > > make them work as multiple independent computers.  Unfortunately, all it says
> > > > about *how* to do this is it would be 'tricky'.  This is from
> > > > http://www.sunhelp.org/faq/sunref2.html , "Miscellaneous Questions and
> > > > Answers" #9 .   Does anyone have any information about how to do this?
> > > >
> > > > I apologize if this is a common question.  I tried looking through the
> > > > archives, but if there is a search feature, I couldn't find it.
> > > >
> > > > TIA,
> > > >
> > > > - Rob
> > > > .
> > > >
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