> > However, this still raises the interesing question of whether endian-ness
> > even belongs in MACHINE_ARCH.  Obviously for some processors endian-ness
> > is determined by MACHINE_ARCH, so besides Mips and Hitachi, what other
> > processors can run in big or little endian modes?
> 
> IA-64.  Forthcoming (i386) applications must prepare for bi-endianness.

I believe that certain models of PA-RISC processors can run bi-endian,
though I don't believe any little-endian PA systems have been built..