@tkaiser - Maybe you, my good sir, have any idea ! I’ve read your reviews and digging more into M3, I am starting to believe that I made a terrible mistake when buying two Banana Pi’s M3.
I am positive that I’ve used the same pins on the M3 as well as the Pi Zero. I have checked with the multi-meter and I have also consulted both of the device’s documentation and pin layouts.
I can see the Image where you wired the cables but i think only you know which one is which, so i can’t help just looking at the picture, sorry.
Regarding the availability of the pins, i just mean that for example, pin12 may be in use by UART and you need this pin as output or input, the same for TWI and so on. Or you need I2C, this must be set on DTB and kernel config.
It is a nice project, if you go with mainline you should ask on Armbian forum also, maybe someone have this working with similar AW platform and can be used as a reference.