I run Android 5.1.1 on M3 recently. Can I receive the data of GPS Module from the serial port of UART2-TX and UART2-RX,If yes ,where can i find it.Or if i run Ubuntu，can i receive the data,and how can I read it.Many thanks for your help!
yes ,you can do it . just use UART2 TX&RX ,
you can see BPI-M3 SCH: