Possible to run PRU while CPU and OS are powered down to reduce energie consumption?

Hi there!

First of all: Thanks for Beaglebone Black! It’s so amazing I learned so many things with and from it.

I have a question, and because of my low skills I wasn’t able to find an answere.

Is it possible to run the PRU while the main system and processor are not consuming any energy?

And would it further be possible to power up the main system by the PRU when certain GPIO states occur?

And of course if, how? What should I read to understand this?

Thank you very much,