[rescue] Did i nuke my SS20?

[Romain Dolbeau]

Le lun. 2 aoC;t 2021 C  16:50, Ray Brooks <ray.userinterface at gmail.com> a
C)crit :
>   The good news is that the motherboard isn't nuked.

Good news indeed :-) Those were built to last, fortunately.

> I've managed to get it to POST via serial by stripping it back to the
absolute bare bones as suggested by Romain.
> I need to do some more digging around here to fully track down the problem
but the good news is that nothing important seems to be broken. Phew!

If you reach the PROM prompt, you're all good if it's with the new NVRAM.
You just need to full-reset it as per the NVRAM faq (i.e.,
set-defaults, then invalidate the checkum and set the new hostid/mac
with mkpl).
Then you can disable the diag-switch? parameter and reset the system -
the POST should be much, much shorter with a valid NVRAM and
diag-switch? set to false.

You should then be able to carefully put everything back and restart.

Depending if you're more worried about the power-supply not liking
many power-cycles or some piece of hardware having a fault, you'll
have to choose between 'put everything at once and hope for the best'
and 'put things one by one and check every time'...

Cordially,

--
Romain Dolbeau