Hello, It’s my first time to use the board of RK3328-CC. Does anyone knows how to use its serial port for communication (without module USB2TTL). I have found one similar solution for raspberry pi, https://blog.csdn.net/asukasmallriver/article/details/76851375, while it doesn’t work for RK3328. Can anyone helps me?The system of board is Ubuntu 16.04. Thanks a lot. 
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