km@emory.CSNET (Ken Mandelberg) (09/09/86)
We bought some Vax 750 1 Meg boards from Digital Data
Systems. For some reason when first powered up 4.2-3 BSD
doesn't see them. More precisely Unix sees the first 256K of the
first DDS board, and nothing past it. The company says it isn't a
problem on VMS, and in fact if we run the DEC memory diagnostic before
booting, Unix sees all the memory until the next power failure.
The company said that it had something to do with the fact
they used 256K parts, and the initial pattern that comes
up on the board is different. I would like a more detailed
explanation if anyone understands the issue.
Does anyone have an easy solution to avoid the manual intervention
needed on a cold boot. If I understood what the DEC diagnostic
did, I could probably build it in to the Unix bootstrap. However,
frankly I would be just as happy with an operational solution.
Right now, the 750 boots off RA81 directly from the boot Rom.
I'm wondering if there is a way to boot a memory diagnostic off
the tu58 instead, and then have it call the RA81 boot just like
the rom would.
Ken Mandelberg
Emory University
Dept of Math and CS
Atlanta, Ga 30322
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