kernel dumps on powerpc/pmap questions

[Super Bisquit]

Why don't you ask Whitehorn or other members of the FreeBSD PowerPC
team this question. Very few of the hackers deal with anything outside
of standard i386 and AMD64 platforms.

nwhitehorn at freebsd.org
	chmeeedalf at gmail.com  Justin Hibbits



On 4/3/11, Andreas Tobler <andreast at freebsd.org> wrote:
> 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
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