Sun dead battery / unresponsive openboot

Sean Caron scaron at
Sun May 3 15:48:57 CDT 2015

I have seen almost anything once on Sun machines :O Are you testing with
all cables disconnected just power and serial terminal? I have seriously
seen a bad network cable cause mysterious hangs on a SS10 once...

You've tried some of the other usual troubleshooting stuff like swapping
out/around some of the memory, removing Sbus cards, etc?

Under normal circumstances, it /should/ drop to OF with a dead IDPROM per
my experience ... I always think of my Macs and my NeXTs as being the most
troublesome for not powering on when the battery is flat ... Suns are
almost always ... 99.99% of the time ... good about it.



On Sun, May 3, 2015 at 12:50 PM, Jules Richardson <
jules.richardson99 at> wrote:

> The PROM battery appears to have died in my Sun U1 (Ethernet address and
> host ID all ff's etc.).
> I can hack a new battery into it at some point - but can anyone confirm
> whether the openboot environment should be responsive even while the
> battery is hosed? Via a serial console, I can send a break and get an OK
> prompt back, but then it appears to go unresponsive and won't accept
> commands (no key presses aren't echoed back to the screen).
> Using the same terminal emulator / cabling is fine with my other Sun (a
> U2), so I'm reasonably confident that the environment is OK, and that the
> problem is local to the U1 machine.
> cheers
> Jules

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