I'm trying to dynamically add a uart console device (/dev/ttyu0) to the low-level console list per conscontrol(8), but always get an ENXIO error:
root@wasp:~ # conscontrol add /dev/ttyu0
conscontrol: could not add ttyu0 as a console: Device not configured
I've tried it with getty running and not running, as well as with a terminal connected and not connected with the same results in all cases.
root@wasp:~ # uname -a
FreeBSD wasp 11.0-CURRENT FreeBSD 11.0-CURRENT #14: Mon Jun 16 01:01:23 PDT 2014 admin@wasp:/usr/obj/usr/src/sys/GENERIC amd64