kernel dumps on powerpc/pmap questions

[Super Bisquit]

Apologies; but, he can get more help from one of the two of you before
he can get any from the FreeBSD hacker mailing list.
On 4/3/11, Super Bisquit <superbisquit at gmail.com> wrote:
> 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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>