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

Dave McGuire rescue at sunhelp.org
Thu Jun 14 17:31:24 CDT 2001

  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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