UART1: 4 wire, RS-232 level UART
UART3: 4 wire, RS-232 level UART
are both working as expected due to calling wrong "name".
But still unable to get UART_5 working. with "dmesg | grep tty" command on the 6+ console, i guessed UART_5 should point to Line 4. I am using UART TTL to RS232 converter.
With setserial command, it showed:
/dev/ttymxc4, Line 4, UART: undefined, Port: 0x0000, IRQ: 75
Baud_base: 5000000, close_delay: 50, divisor: 0
Do I need to do any setting or is there any recommended hardware that i need in order to use UART_5?