Hi,
I have Kernel Version: 4.19.50-ti-r20
running debian buster.
The Console is UART0 port linked to /dev/ttyS0:
crw------- 1 debian tty 4, 64 Jul 7 17:19 /dev/ttyS0

I try to accept user input from the ttyS0 during booting process in a service script.
I followed steps in outlined in the link:
https://alan-mushi.github.io/2014/10...h-systemd.html
But not working. It seems to me that ttyS0 is not redirected to TTYPath=/dev/tty2. I also tried chvt 13

//=== ncu-install.service
[Unit]
Description=NCU Installation
After=network.target sshd.service systemd-logind.service getty@tty2.service
[Service]
Type=oneshot
TTYPath=/dev/tty2
ExecStartPre=/bin/chvt 13
ExecStart=/ncu_install/ncu_install.sh
ExecStartPost=/bin/chvt 1
StandardInput=tty
TTYVHangup=yes
TTYReset=yes
TTYVTDisallocate=yes
#RemainAfterExit=no
[Install]
WantedBy=default.target
RequiredBy=sshd.service systemd-logind.service getty@tty1.service

//=====
They are not working.
Anything I missed?
Thank You,
David

/dev/tty2 is the second virtual terminal. When you enable virtual terminals, you can switch to tty2 by doing Ctrl-Alt-2 on the directly attached keyboard/display. It has nothing to do with serial consoles.

See instead:
https://www.linuxquestions.org/quest...-a-4175557041/

If systemctl can't find the service you may have to copy the template /usr/lib/systemd/system/serial-getty@.service
to /etc/systemd/system/serial-getty@ttyS0.service and edit for the baud rate or other parameters that you want.

You may also want to add to your grub config so that grub and kernel console go to the serial port. See:
https://wiki.archlinux.org/title/Wor...serial_console

It didn't work for me. And I stopped this approach.
Thanks