相關文件
Firefly USB轉UART串口模塊（驅動程序）：
http://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
串口調試教程：
Firefly-RK3399: http://wiki.t-firefly.com/index.php/Firefly-RK3399/Serial_debug
F irefly-RK3288: http://wiki.t-firefly.com/index.php/Firefly-RK3288/Serial_debug
FirePrime: http://wiki.t-firefly.com/index.php/FirePrime/Serial_debug
