[OpenBIOS] [RFC] Make BootX from Mac OS X 10.4 work

[Alexander Graf]

On 31.07.2009, at 08:22, Igor Kovalenko wrote:

> On Thu, Jul 30, 2009 at 8:00 PM, Alexander Graf<agraf at suse.de> wrote:
>> Using this patch stacked on Steven Noonan's I was able to make  
>> BootX from
>> Mac OS X 10.4 load XNU successfully in qemu-system-ppc.
>>
>> Unfortunately, most of this patch is nothing but a mere hack to  
>> find out
>> what we really need to get this working.
>>
>> Also I didn't manage to get anything but 10.4 running. Other  
>> versions broke
>> in the partition table interpretation.
>>
>> I would not feel good taking the patch as is, because it would be  
>> better to
>> implement the correct Forth magic to make the real callbacks work.  
>> Here is
>> what I found to be broken:
>>
>>  - unselect-dev is missing
>>  - local variables don't work ({ ... })
>>  - I ran into an endless loop, getting isi and dsi faults on the  
>> same 2
>>    addresses all the time
>>
>> Also, Qemu's only usable Desktop PPC target is a G3 Beige which is  
>> only
>> supported up to 10.2.8 IIRC. So even getting the bootloader running  
>> for
>> 10.4 didn't exactly buy me much.
>>
>
> While working on sparc64 ofmem patch I used ppc/qemu ofmem
> implementation as reference. What I noticed is there are several
> corner cases not handled by range lists code; I fixed several ones
> for sparc64.

It looked like the real problem was the low level hash entry  
mechanism, which is the one I changed.

> Hope we can work out good common ofmem base soon.

That would still be great. In fact, hearing that all other targets  
broke anyways, it might make sense to take the qemu/ directory and  
just make it the default for all of ppc.

 From there on going towards merging different architectures as well  
sounds like a really good idea.

Alex