[OpenBIOS] [Qemu-ppc] FreeBSD powerpc issue

Segher Boessenkool segher at kernel.crashing.org
Sun Aug 26 19:02:31 CEST 2012

>> 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.

>> 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 :-)

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


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