BBN support for MacArthur HAT

[mgrouch]

Something like this?

https://github.com/bareboat-necessities/...nt-9344748

UARTs of the MacArthur hat for NMEA 0183 on BBN Marine OS

Raspberry Pi 5

NMEA 1 in/out: UART2
NMEA 2 in/out: UART4

in /boot/firmware/config.txt

dtparam=uart0=on
dtoverlay=uart2-pi5
dtoverlay=uart4-pi5
Raspberry Pi 4 and 3

NMEA 1 in/out: UART3
NMEA 2 in/out: UART5

dtoverlay=disable-bt
dtoverlay=uart3
dtoverlay=uart5
Reboot after editing /boot/firmware/config.txt

and check devices created

ls -ltr /dev/tty*