This is a small patch to deviceiobook.tmpl to describe the new mmiowb routine 
a bit more completely.  I've also updated it to provide pointers to drivers 
that do write flushing, use mmiowb, and use the readX_relaxed routines.

Acked-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>

Thanks,
Jesse