Thread (19 messages) 19 messages, 3 authors, 2011-06-10

Re: 3.0-rc1: powerpc hangs at Kernel virtual memory layout

From: Christian Kujau <hidden>
Date: 2011-06-02 06:17:03
Also in: lkml

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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