[Open-graphics] From PCI to VGA registers

[Dieter]

> In order to facilitate early boot access to a device some cards have a chunk 
> of ROM BIOS code on them. Typically this will be x86/pc machine code and/or 
> Forth OpenFirmware code. If you can't run this natively you have to either 
> emulate it (Xfree86 contains an x86 emulator for this purpose), or just build 
> the setup code into your system and ignore the rom.

It is not clear to me how Xfree86 having an x86 emulator helps with early boot?

IIRC, some non-x86 machines have an x86 translator in firmware.

> For non-x86 systems we generally don't care about vga compatibility.

How does the non-x86 firmware display console messages?