Re: common ieee1275 code

[Hollis Blanchard]

This patch is loosely based on Vincent's Sparc patches. It changes the 
IEEE1275 code to use a new type, grub_ieee1275_cell_t. This is 
necessary because OpenBoot on Sparc requires the cell size to be 64 
bits, while Open Firmware on PowerPC requires it to be 32 bits.

It's rather large because it moves a few files around that Vincent 
indicated can be directly shared between Sparc and PowerPC:
- disk/powerpc/ieee1275/ofdisk.c -> disk/ieee1275/ofdisk.c
- include/grub/powerpc/ieee1275/ieee1275.h -> 
include/grub/ieee1275/ieee1275.h
- include/grub/powerpc/ieee1275/ofdisk.h -> 
include/grub/ieee1275/ofdisk.h
- term/powerpc/ieee1275/ofconsole.c -> term/ieee1275/ofconsole.c
- boot/powerpc/ieee1275/ieee1275.c -> kern/ieee1275.c

As long as I was moving things around, I noticed that 
<grub/machine/console.h> was no longer useful, so consolidated both 
i386 and powerpc's into include/grub/console.h.

I have tested this on PowerPC, and once all the compile annoyances were 
fixed it booted perfectly.

Vincent, this is not exactly what you had in some places, but I think 
this diff will help you a lot.

If there are no complaints, I will send a real changelog entry soon.

-Hollis

grub-ieee1275.diff
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