Re: hang on panic, can not return to OBP

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> > I'm on serial console:
> > [  129.237799] f005de3c: ttyS0 at MMIO 0x1fff8902000 (irq = 2) is a zs (ESCC)
> > [  129.237925] Console: ttyS0 (SunZilog zs0)
> > [  129.238289] console [ttyS0] enabled
> > 
> > Strange that this time (fresh todays git kernel with no changes) I can 
> > use BREAK successfully - and I only need to send it once from minicom 
> > (^A F).
> 
> Strange...  I have to send two breaks on hypervisor sun4v consoles.
> 
> Because the way you send Alt-SYSRQ keycodes on serial consoles
> is BREAK+sysrq_code, and that's why two breaks are necessary to
> indicate a real break into the OBP prompt.
> 
> I suspect it doesn't work for you in that other case because it's
> at a point before the serial driver has even registered yet.

I think it was registered...

Just tried with fully booted up system (E3500, console on zs serial) and 
single BREAK was enough to drop to prom ok prompt.

-- 
Meelis Roos (mroos@xxxxxxxx)
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