Console Output and Serial Terminals
From MediaWiki
Serial Console On NST 2.x.x Or Above
Use the following command to manually enable the serial console on NST versions 2.x.x or above. This example will set the serial baud rate to: "57600" and use serial device: "/dev/ttyS0".
[root@probe ~]# initctl emit --no-wait fedora.serial-console-available ttyS0 57600
[root@probe ~]#