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)
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