mount_sysvbfs —
mount a System V Boot File System
  
    | mount_sysvbfs | [ -ooptions]
      special node | 
The mount_sysvbfs command attaches the System V Boot
  File System on the special device on to the file system
  tree at point node. Both special
  and node are converted to absolute paths before use.
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.
Amount_sysvbfs command first appeared in
  NetBSD 4.0.
The sysvbfs support is still experimental and there are few sanity checks, so it
  is possible for a corrupted file system to cause a crash.