====== How to release /dev/ttyS0 from console once boot? ======

The console is directed to ttyS0 via a line in the inittab file.

In /etc/inittab:
  # Example how to put a getty on a serial line (for a terminal)
  #
  T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100
  #T1:23:respawn:/sbin/getty -L ttyS1 9600 vt100

So it would be possible to adjust this file after boot once your system
is in a state where you do not need the console.

By the way the command 'init q' will cause init to reload this file.

[Mike]

=============================================

Another solution would be:
  T0:23:once:/sbin/getty -L ttyS0 38400
this allows only one (emergency) connect.

And from your application:
  killall getty
this frees up ttyS0.

[Uwe]