Serial output

Serial port can be used like "vga output" instead of vga/monitor ..

• edit grub

vim /etc/default/grub

• add/edit follow

# set terminal for output/input
GRUB_TERMINAL="serial console"

# set params -> unit 0 = ttyS0
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"

# add params for kernel to set ttyS0 output
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash console=tty0 console=ttyS0,115200n8"

• update-grub
• in case of trouble, perform force enable

systemctl enable --now serial-getty@ttyS0.service

• thats all