I'm trying to set up a softraid crypto volume on top of a disk partition
/dev/wd0j (on an i386 laptop running 4.8-release).  I'm using
  # bioctl -c C -r 100000 -l /dev/wd0j softraid0
to try to initially create the softraid volume.  I expected this to
prompt me (twice) for a passphrase, then give me a softraid0 device
somehow accessible as /dev/sd0 or suchlike.  Instead, it complains
  bioctl: ioctl: Invalid argument
while my console window says
  softraid0: Invalid metadata format

What am I doing wrong?  What's the right way to initially create a
softraid crypto volume on top of a disk partition?  Is there a FM I
should R to be enlighted (beyond softraid(4) and bioctl(8) which I've
already read)?

thanks, ciao,

-- 
-- "Jonathan Thornburg [remove -animal to reply]" <jthorn@astro.indiana-zebra.edu>
   Dept of Astronomy, Indiana University, Bloomington, Indiana, USA
   "Washing one's hands of the conflict between the powerful and the
    powerless means to side with the powerful, not to be neutral."
                                      -- quote by Freire / poster by Oxfam