#4 vgetty Interference

[Ronald W. Heiby]

If vgetty is configured on the port, the flash does not
appear to work at all. Utility should conform to
locking protocols for the tty ports and co-exist
peacefully with vgetty et al.

Undocumented Workaround: Disable anything else that
wants to be looking at the port until the flash is
finished.