Enable Uart in ARMBIAN

Open the port

#mount /dev/nanda /mnt
#cd /mnt
#bin2fex  script.bin script.fex
#vi script.fex

Modify the script.fex to open the uart3 ，uart4 as below ：

[uart_para3]
uart_used = 1
uart_port = 3
uart_type = 4
uart_tx = port:PG06<4><1><default><default>
uart_rx = port:PG07<4><1><default><default>
uart_rts = port:PG08<4><1><default><default>
uart_cts = port:PG09<4><1><default><default>

[uart_para4]
uart_used = 1
uart_port = 4
uart_type = 2
uart_tx = port:PG10<4><1><default><default>
uart_rx = port:PG11<4><1><default><default>

Save the modification.

#fex2bin script.fex  script.bin
#reboot

After the reboot ,the uart3 and uart4 are available.

Cubieboard1 And Cubieboard2 Gpio Pin