[SunHELP] NVRAM weirdness

[Hichael Morton]

I was told in a SunED class that you can turn the NVRAM chip around and
start the Sparc.  After a few seconds, the NVRAM will be cleared and
reset to the defaults.  The SunEd instructor said this is not support
but works none-the-less.


Hope this helps,

HM


bran tregare wrote:
> 
> if the NVRAM chip is socketed, reboot with the chip out, then when it comes
> up to the OBP, plug the NVRAM chip back in and reset it to defaults.
> 
> -However- it is possible to trash the nvram while doing this.  I thought I
> should warn you.
> 
> At 03:15 PM 2/7/02 -0500, you wrote:
> >Hello all-
> >         I wrote in a couple of weeks ago about the Kodak Image Magic PS4 (aka
> >Sun Ultra 5) that I had but that I couldn't boot anything other than the
> >Kodak HDD. I ordered a new PROM/NVRAM/whatever chip from Mouser and I
> >installed it today, and following the directions from the PROM
> >reprogramming page I was able to successfully reprogram the new PROM.
> >         Weird thing is, I was about to do a Debian install, booting via
> > TFTP. I
> >had the original Kodak disk drive in there and it booted off that before
> >I could get into OpenBOOT. It flashed something about Solaris 5.5 on the
> >screen before it reset the machine. Now my new PROM is exhibiting the
> >same symptoms as the old PROM... i.e. I can no longer get into the
> >OpenBOOT menu, it simply says "Initializing... Please Wait..." when it
> >is booting. Then it won't do a thing unless the original drive is hooked
> >up.
> >         I was careful to reset the PROM write-protect jumper after
> > programming
> >my new PROM, but the KODAK software has somehow managed to munge my
> >brand new PROM even with it write-protected!  Anyone have any idea how
> >to reverse this/short the PROM so that I can reprogram it again? Or am I
> >going to have to shell out another $25 bux and wait another 2 weeks for
> >yet another new PROM from Mouser?
> >
> >Thanks again,
> >Zack
> >_______________________________________________
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