PowerPC patches

[Pavel Roskin]

Hello!

I'm going to send the remaining patches for PowerPC to the list.  I  
don't want to spend more time on it, and I don't want to sit on those  
patches.  If any of them are good, I'll apply then.  If not, somebody  
could fix them later.  I don't want to spend more time on them.

I added completely untested CHRP support to grub-mkrescue and updated  
the copyright.  I don't want to add PREP support blindly, without  
hardware to test it on.  Besides, PREP would probably need serial  
console.

Open Hack'Ware used as the firmware by QEMU on PowerPC lacks  
/memory/available.  I don't know what Linux does to find the memory,  
but it fails to boot anyway when loaded from GRUB under qemu.  I think  
either /memory/available should be implemented in Open Hack'Ware or  
qemu should switch to another Openfirmware implementation.

Anyway, I made a patch that allocates memory between 3Mb and 4Mb.   
That's what yaboot would do.  Actually, yaboot would scan for a 1Mb  
chunk from 3Mb to 16Mb, but it's an overkill for a simple hack.

Finally, I made a patch that restores a gap between the end of the  
core code and the beginning of the modules in the image created by  
grub-mkimage.  I realize that making the resulting image a valid ELF  
file would likely achieve the same goal, but I don't have time for that.

--
Regards,
Pavel Roskin