Just FYI, the changes to resurect h8300-tdep.c and h8300.mt are ok (I 
see the're already committed).  However the change to resurect 
config/h8300/tm-h8300.h isn't - the h8300 is now considered to be a new 
architecture and any new architecture is required to be pure multi-arch 
(i.e., no tm-*.h file).

Looking forward to patches that fix that.

In the mean time I've committed the attached,
Andrew