添加一个新的文件 /lib/systemd/system/ttyUSB0.service （文件名字自己取，这里用usb 串口举例）
root@my_desktop:~# cat /lib/systemd/system/ttyUSB0.service
[Unit]
Description=USB serial console service
[Service]
ExecStart=/sbin/getty -L 115200 ttyUSB0 vt102
Restart=always
[Install]
WantedBy=multi-user.target
ttyUSB0 是驱动文件的名字，根据实际环境替换
然后执行如下命令启动service
root@my_desktop:~# systemctl daemon-reload
root@my_desktop:~# systemctl enable ttyUSB0
Created symlink from /etc/systemd/system/multi-user.target.wants/ttyUSB0.service to /lib/systemd/system/ttyUSB0.service.
root@my_desktop:~# systemctl start ttyUSB0
