插入串口设备调试信息为
[ 313.402462] usb 3-1.1: new full-speed USB device number 4 using usb20_host
[ 313.508540] usb 3-1.1: New USB device found, idVendor=0403, idProduct=6001
[ 313.508553] usb 3-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 313.508560] usb 3-1.1: Product: USB Serial Converter
[ 313.508567] usb 3-1.1: Manufacturer: FTDI
[ 313.508572] usb 3-1.1: SerialNumber: FT9GJ8PJ
已经添加过设备驱动了