arm linux 移植usb转串口驱动

  arm-linux下移植usb转串口

内核添加串口驱动：

 Device Drivers  --->   

        USB support  --->

               --- USB port drivers

               USB Serial Converter support  ---> 

                       <*> USB Serial Converter support

                       [*]   USB Serial Console device support (EXPERIMENTAL)

                      < >   USB AIRcable Bluetooth Dongle Driver (EXPERIMENTAL)

                      <*>   USB FTDI Single Port Serial Driver (EXPERIMENTAL)