I was going to try to use the SPI interface(s) on the board and just found this in the forums: BeagleY-AI: spi - #10 by jkridner seems to be a resolution.
I am going to try to port a “Hat” to the BeagleY-AI for now: mjbots/pi3hat
I thought it would be neat and fun-filled. If anyone has any documentation on this port, please step forward, e.g. either good or bad testing.