My apologies if this is a ultra basic question:
Does linux / systemd / agetty support double ended serial-getty consoles?
For example I have two remote servers A and B, they are running a recent ubuntu with systemd, agetty and screen installed.There is a null modem cable installed bewteen the servers and it appears on /dev/ttyS0 on both.
From Server B I can use screen to get a login prompt (agetty) on server A.
From that prompt I can reboot the server A, grub comes up I can make choices in grub, boot Linux, I see the boot messages, then a successful login prompt etc all over a serial link from B.
Is it possible to do the reverse with the same serial port/link ?Can I use screen to login to server B from A over the same /dev/ttyS0?Can server B also have agetty listen on /dev/ttyS0 when it is not in use by screen?
And if not and I need a second serial port/cable to get from A -> B, is that a hardware limitation of UART or a software limitation of agetty or systemd ?And if its a systemd issue it this possible in a non-systemd Linux say Gentoo?
Thank you in advance.
