scmdspi —
SPI frontend to the Sparkfun Serial Controlled Motor
  Driver
scmd* at spi? slave 0
scmd* at spi? slave 1
The scmdspi driver provides the SPI frontend attachment
  for the Sparkfun SCMD device.
The following sysctl(3) variables
  are inherited from scmd(4) :
  - hw.scmd0.debug
- If the driver is compiled with SCMD_DEBUG, this
      node will appear and can be used to set the debugging level.
  - /dev/scmdu
- character device allowing access to the register space of a main
      u, SCMD device
Thescmdspi driver first appeared in
  NetBSD 10.0.
When used in SPI mode, the SCMD device uses an odd method of doing reads that
  can become stuck. See the command spi_read_one in the
  scmdctl(1) utility to try and
  unstick the device when this happens.