Pin multiplexing on BBB using ubuntu snappy(11-6-2015)

I could multiplex a pin in the past using Angstrom. Now I’m using Ubuntu snappy with different device overlay tree and the configurations are also different. I couldn’t find a guide or tutorial to use all hardware resources :frowning:
I can blink the led, but I need much more configurations.
Can you help me to drive a uart and send some strings or use AM3358 pwm?

Thank you

You might want to ask on #snappy (irc freenode) as i don't think the
ubuntu snappy team monitors this list just yet..