[rescue] Did i nuke my SS20?

[Peter Stokes]

Hi

There was a curious comment re modern M48T08 not working in old Sun kit due to
a timing issue. I have bought a fair number over the last few years from the
official distis such as Farnell and Mouser and had zero issues. The new M48T02
is a different matter and most versions of OBP have an issue from what I
remember when testing them.

FYI the official chip for the SS20 is the M48T18 not the M48T08, but in my
experience they are interchangeable.

Peter

Sent from my iPad

> On 2 Aug 2021, at 17:16, Romain Dolbeau <romain at dolbeau.org> wrote:
>
> o;?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
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