The ARM board computer I am currently working on does not have a working framebuffer terminal due to a buggy kernel.
I have managed to follow the instructions at https://help.ubuntu.com/community/SerialConsoleHowto to get the login prompt up on the UART port.
However my USB-UART adapter has a broken input line.
Thus I want to know how I can connect the output via ttyS0 with the input via tty0 (connected to the USB keyboard) so I can interact with my computer.
I wonder if it is possible to echo tty0 into ttyS0?