>> Migration to evbppc is under consideration.
> 
> What are the arguments to not migrate it to evbppc?

Not a big deal.  I'm hesitating to do so before renovation
branch gets mature enough to terminate.

I found powerpc/pic cascadable interrupt dispatch scheme
is snip handy to eliminate port specific extintr.c file.  It's
even useful for non cascading, single and plain flat interrupt
controllers.  For example, NetBSD/pmppc can take advantage
of it by having pic_cpc700.c whose size would be no larger
than ~100 lines.

Toru Nishimura/ALKYL Technology