romcc fixes for AMD64

[ron minnich]

On Tue, 16 Sep 2003, Stefan Reinauer wrote:

> This could be done using the Opterons PAE feature. Currently I see a
> tradeoff between LinuxBIOS image size and the design conflict when going
> away from 16bit firmware on 32bit systems while staying with 32bit on
> a 64bit platform.

this won't last very long here. 36 bits only gets us to 64 GB -- too 
small. 

LinuxBIOS has run in 64-bit mode on a 64-bit platform -- the alpha. I see 
no real issue with going to 64-bit opteron mode. 

rno