You can keep the Atmel in RESET mode (for a low power consumption) from i.MX6 by using: Code: echo out > /sys/class/gpio/gpio0/direction echo 0 > /sys/class/gpio/gpio0/value you can wake it up again with Code: echo 1 > /sys/class/gpio/gpio0/value You can't do the opposite 'cause if you restart the i.MX6 the Atmel will restart as well.
It's an advanced topic but I have had a look through the Atmel SAM3X8E and Freescale i.MX6 Datasheets, to explore the power saving states etc. I can see several Use Cases where it would be desirable to drop down into a lower state for extended periods of time without being off. Something to explore in the future for sure!
I am going to have to hook up all my power testing equipment and see how much of a measurable difference this makes. This is good info!! Thanks Delba !
