多个串口加输出

查看有哪些串口

dmesg | grep -E "tty|console"

查看哪些串口设备正在被使用

sudo lsof /dev/ttyAMA*

ttyAMA0和ttyAMA1加串口输出

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash loglevel=0 console=tty0 console=ttyAMA0,115200n8 console=ttyAMA1,115200n8"
GRUB_CMDLINE_LINUX=""

启用串口服务

sudo systemctl enable serial-getty@ttyAMA0.service
sudo systemctl start serial-getty@ttyAMA0.service
sudo systemctl enable serial-getty@ttyAMA1.service
sudo systemctl start serial-getty@ttyAMA1.service