Re: [Qemu-ppc] [OpenBIOS] FreeBSD powerpc issue

[Andreas Tobler]

On 26.08.12 19:02, Segher Boessenkool wrote:
> > > Now I have to find out about why the OpwnBIOS area is not mapped.
> > > Is it the case that the 'of' code on Apple HW is located
> > > elsewhere, not on such high address like 0xfff00000?
>
> Apple OF normally sits at the top of the address space, too.

Thanks for clarification!

> > > Or should that not matter?
> >
> > Phew. I honestly have no idea how this would work at all even on
> > Apple HW. Linux simply handles everything from real mode (disable
> > paging) when going into anything firmware related. I have no idea
> > what OpenBSD does. If you could try to find out and summarize it, I
> > might be able to reconstruct how it could work :).
>
> Perhaps the OpenBSD code did not flush the TLB yet?  Or does QEMU
> emulate the TLB properly?  I seriously doubt that :-)

Hm, s/OpenBSD/FreeBSD. :)

How do I flush the TLB? Then I can look up in the code and see where it 
is done. I guess we do that but the place/time might be the question.
(Otherwise it wouldn't work on real HW, right?)

> The logs do not show whether segment x'f is still mapped in the
> SRs (or I missed it).  Is it?

How can I enable this log or make it visible?

And sorry for not being subscribed to the OPenBIOS list. Now I am and 
everybody should see all my posts to this list too.

Thanks!
Andreas