on the target host (openbsd), i disabled the getty:
$ sudo cat /etc/ttys|grep tty00
tty00   none                            unknown off
#tty00  "/usr/libexec/getty std.115200" vt220   on secure

on the xubuntu host, there was no getty on any ttyS:
$ sudo pstree -ac|grep getty
  |-getty -8 38400 tty4
  |-getty -8 38400 tty5
  |-getty -8 38400 tty2
  |-getty -8 38400 tty3
  |-getty -8 38400 tty6
  |-getty -8 38400 tty1
  |   |   |-grep --color=auto getty

on the target host, i have:
$ sudo od -t x1 /dev/tty00

on the xubuntu host, i'm trying to send:
$ sudo echo -n '1234567890'>/dev/ttyS0

i usually get nothing, except "0000000   00  00  00  00  00  00  00  00
00  00  00  00  00  00  00  00" followed by "*"; this only happens if i
freshly started 'od' on the target host, and i try to send something
twice. after that, the line stays dead. i can not provoke this in any
other way, than starting 'od' and sending something.

i don't have a breakout box and i suck at soldering, but i will ask
around.

thanks for your time!

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https://bugs.launchpad.net/bugs/1094278

Title:
  cu doesn't connect properly to a serial console

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