I've just put up the key parts of the remote kgdb
code for i386 to:
zelof1.zel.kfa-juelich.de:/pub/NetBSD/kgdb-i386.tar.gz

Integration with the serial driver is still crude, it uses
the serial console code at the moment. I simply didn't
want to make changes to com.c because there seems to
be active development.

best regards
Matthias Drochner