ppc linuxbios support

[Greg Watson]

Hi Ramkumar,

Ports to new boards, or suggestions on how to make the PPC code more 
modular and robust are always appreciated.

You might want to start by getting linuxbios booting a linux kernel 
on the 755. This shouldn't be too difficult, as the 755 appears to 
use the same northbridge as the 7410. I used the MontiVista linux as 
it was already ported to the Sandpoint, though I had to make a few 
patches to get it to boot with linuxbios. Let me know when you get to 
this point and I can send you the patches.

I've just ordered an EP405PC from EmbeddedPlanet which will be my 
next port. It uses the IBM PPC 405Gpr chip which is sufficiently 
different to the 7410 to be challenging.

Hopefully this week I'll have the PPC version working under the new 
configuration system (check out freebios2 instead of freebios). This 
is going to allow us to build a static device tree which can be 
passed to linux. Heiko Schick and I have been discussing the 
possibility of mapping this device tree to an Open Firmware device 
tree that can then be used to boot linux on an OF system (such as 
Power Mac's).

Stefan Reinauer has reminded me that we should work with the openbios 
community on this, though looking at the IEEE 1275 spec (all 250+ 
pages) I think they've got a big job ahead. :-)

Cheers,

Greg


>I would be interested in helping out in the testing/development of 
>the PPC BIOS. Also, have access to sandpoint 755. Let me know if I 
>can help.
>
>Thanks
>
>Ramkumar
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