i.MX setup auto login

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The default BSP provided by NXP requires login in UART after booting up, which seems “unfriendly” to some users.

In i.MX Yocto BSP, Login is provided by a systemd service called systemd-serialgetty:
sources/poky/meta/recipes-core/systemd/systemd-serialgetty/serial-getty@.service
This service will execute agetty when system booting up and require login.

So there are two ways to disable login:

Replace agetty with /bin/login

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ExecStart=/bin/login -f root

Provide username to agetty

Add option -a to provide username to agetty.

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[Service]
Environment="TERM=xterm"
#ExecStart=-/sbin/agetty -8 -L %I @BAUDRATE@ $TERM
ExecStart=-/sbin/agetty -8 -a root -L %I @BAUDRATE@ $TERM
Type=idle
Restart=always
RestartSec=0