Izumi Tsutsui <tsutsui@ceres.dti.ne.jp> writes:

>> Are there any systems with this kind of firewire support in practice?
>
> FreeBSD seems to have some support of KGDB over firewire:
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/firewire/00README

... and there is this tutorial by Greg Lehey which has been around for
some time where (among other things) he shows how to use firewire to
debug a FreeBSD kernel.

http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf

Regards,
 Aymeric