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i.MX6SX: Wake A9 up from M4

Question asked by Davide Aguiari on Feb 9, 2017
Latest reply on Feb 10, 2017 by igorpadykov

Hi guys,
I'm working with a UDOO Neo full board at the moment and they have a i.MX6SX embedded.
I'm a newbye in this field and I can't find a solution for my problem.

 

In order to achieve a low power consumption I need a sleep/awake behavior between A9 and M4.
I can put the A9 into sleep if I do

 

echo standby > /sys/power/stat

 

But I need a way to wake it up through the ttyMCC serial, so with a serial.print() from M4 sketch. T

here is no wakeup in /sys/bus/platform/drivers/imx6sx-mcc-tty/mcctty.13/power/

 

This is the way I would like. If it's not possible, could I use gpio? How to enable one of them?

 

Thank you!

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