关于arm9G20处理器的串口驱动，没有使用DMA，但可作为驱动学习入门参考，我已经在板子上实现了，当串口不能使用时，可用ssh进行监听。-Serial driver about arm9G20 processors, does not use DMA, but can be used as learning portal reference to the drive, I' ve been on the board when the serial port can not be used, can be used ssh monitoring.