I want to enable UART1, UART4, UART5 on NanoPi R6C board for comunication purposes. I follow https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R6C#Build_Other_Linux to access kernel menuconfig. I have searched in kernel menuconfig but these is no option to enable UART1, UART4, UART5. I contact to ...