I use both /dev/ttyS1 and S2 in my application. It seems that /dev/ttyS2 is the default text console - and this causes me some problems with stdin.

When I use open() and close() on /dev/ttyS2, I inadvertently close stdin for my ssh over wifi console.

As I log in over wifi using ssh, and I configure wpa_supplicant.conf so that it is active on first boot after installation of ubuntu, I have no need for the serial console.

How can I disable the text console, or at least move it off of /dev/ttyS2.