studio@studio:~$  jackd -d firewire
jackdmp 1.9.8
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2011 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
libffado 2.999.0- built Feb 17 2012 15:52:28
01109828663: Error (bebob_avdevice.cpp)[  96] probe: Number of channels command failed
01109908162: Error (avc_avdevice.cpp)[  89] probe: Subunit info command failed
firewire ERR: FFADO: Error creating virtual device
Cannot attach audio driver
JackServer::Open() failed with -1
Failed to open server