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Date: Sun, 03 Apr 2011 09:58:34 +0200
From: Andreas Tobler <andreast@FreeBSD.org>
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Subject: kernel dumps on powerpc/pmap questions
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X-List-Received-Date: Sun, 03 Apr 2011 08:15:22 -0000

Hello all,

to investigate a system lockup I need to implement kerneldumps on 
powerpc. Well, exactly on PowerMacs. The booke should already support 
this feature.

Right now I'm at the point where I can dump something, means the 
mechanism to be able to get a (core) dump for example via 'call doadump' 
in db works. I can restore the dump via savecore.

I took the approach from booke and implemented the necessary functions 
for PowerMacs. But here I'm offline.

I do not understand what I want to dump, means which part of the memory.
Once I know what to dump, where do I find the information, which addresses?

How can I get a picture of the memory organization form powermacs?
Is there a pointer available about pmap in the kernel to find out a bit 
more on this topic?

What is really needed to be able to run kgdb on a core file to be able 
to find where the kernel crashed?

I know the questions are a bit vague, but I need an entry point.

I appreciate any pointer to implement this feature.

Tia,
Andreas