Chris G Demetriou <Chris_G_Demetriou@UX2.SP.CS.CMU.EDU> writes:

> 
> A couple of people have suggested to me that there is some need for
> 'native to bus' and 'bus to native' endianness conversion macros...
> This could very well be a good use for them.

That's not sufficient.  You can have devices that natively speak
big-endian and natively speak little-endian on the same bus.