3.0-rc1: powerpc hangs at Kernel virtual memory layout

[Christian Kujau]

On Thu, 2 Jun 2011 at 08:07, Rafał Miłecki wrote:
> 1) You didn't see (like Andres):
> Machine check in kernel mode.
>  Caused by (from SRR1=149030): Transfer error ack signal
>  Oops: Machine check, sig: 7 [#1]
> But, OK, maybe machine check requires something additional in kernel,
> I don't know...
> 
> 2) You didn't see SSB messages
> This is confusing. You should see SSB messages that appear before my
> invalid read happens. Did you somehow disable most of the important
> logs, or sth? Having ssb messages and the end of hung boot would
> directly point you to ssb module.

BenH advised to boot with udbg-immortal and out came:

 http://nerdbynature.de/bits/3.0-rc1/linux-3.0_powerpc_2.jpg
 http://nerdbynature.de/bits/3.0-rc1/linux-3.0_powerpc_2.mp4
 (watch it at very slow speed, as it's only 3sec long)

I've enabled[0] FB_NVIDIA and during normal booting the screen flickers 
after the "... : fixmap" message and the screen clears and is filled again 
from the top - maybe the messages would've been there if booted w/o the 
framebuffer enabled.

Right now I'm happy that Ben's fix helped to get past this message, but 
the system remains unsuable[1] with the latest -git, but more debugging 
has to wait until tomorrow...

Thanks,
Christian.

[0] http://nerdbynature.de/bits/3.0-rc1/config-2.6.39.txt
[1] https://lkml.org/lkml/2011/6/2/6
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