Pine64-LTS and UART ports

[Kaya Saman]

Hi,


I've attached an RS232c converter board to UART2 on my Pine64-LTS board. 
I followed the pinout diagrams from here:


http://synfare.com/599N105E/hwdocs/pine64/gpiosgeo.html


I'm using Pin 4 and 6 to power the board and have In1 connected to Pin 8 
(TX) and Out1 connected to Pin 10 (RX), on the Pi-2-BUS header.


AK-3232 In1 <- Pine64 Pin8 (UART2 TX)

AK-3232 Out1 -> Pine64 pin10 (UART2 RX)


The converter I'm using is an AK-3232: 
https://www.artekit.eu/ak-3232-usage-guide/ based on the ST3232B chip.


What do I have to do to get FreeBSD to see the AK-3232 board and use it 
as a COM port?


Currently I've gone through the UART man page and am looking here: 
https://www.freebsd.org/doc/en_US.ISO8859-1/articles/serial-uart/article.html


At the moment the only TTY devices listed are the UART0 from the Exp 
connector and the Prolific USB serial converter U0 I have attached.

Here is the version I'm running: 12.0-RELEASE-p3 FreeBSD 12.0-RELEASE-p3 
r347570 PPS-GENERIC  arm64


The only change to my kernel is that I added PPS support to it:


# PPS Support
options         PPS_SYNC


Based on my reading I created a 'hints' file for it:

/boot/device.hints
hint.uart.2.disabled="0"

but I'm not sure if this is correct?


Do I need to adjust anything in the gpioctl? 
https://wiki.freebsd.org/FreeBSD/GPIO


Many thanks.


Kaya