freebsd-dev/etc/devd/devmatch.conf

#
# $FreeBSD$
#

#
# Example devd configuration file for automatically
# loading what modules we can based on nomatch
# events.
#
# Generic NOMATCH event
nomatch 100 {
	action "service devmatch start"
};

# Add the following to devd.conf to preent this from running:
# 	nomatch 1000 {
#		action "true"
#	};
# it replaces the generic event with one of higher priority that
# does nothing. You can also set 'devmatch_enable=NO' in /etc/rc.conf