This is the code I've used to generate a usable toolkit
for myself. It adds support for the 256x devices, limited to the
first half of flash (<128KB). It might be usefull for others
as well.
For the "ultimate" support I read the majority
believes in a generated jumptable in the lower part of flash, to be used for
IJMP/ICALL instructions. Can anybody comment on the status of this work ?