mount_chfs —
mount a CHFS flash file system
Mounts a flash file system from a
  flash(4) device. CHFS file
  systems can be only mounted from flash devices. For regular block devices like
  SSD drives or USB drives, please use a regular file system. The file system
  will be created during the first mount. CHFS stands for Chip File System.
This command is normally executed by
    mount(8) at boot time.
The options are as follows:
  - -o
- Options are specified with a -oflag followed by a
      comma-separated string of options. See the
      mount(8) man page for
      possible options and their meanings.
mount_chfs /dev/flash0
  /mnt
A mount_chfs utility appeared in NetBSD
  6.0. CHFS was originally called ChewieFS during development. The name
  was changed to avoid legal issues and to have a more neutral name.
CHFS was developed at the Department of Software Engineering,
  University of Szeged, Hungary.
CHFS has a few known bugs as of 2011. Writing the FS full can cause problems.
  Truncating a file and growing it again can cause the new bytes not having all
  zeroes, but filled with the old content instead.