IMX7 cortex-m4 low power mode


I tried with the low power mode example for imx7 as below:
When m4 enters Stop mode, set cortex-A7 with linux to go to low power mode with “echo mem>/sys/power/state”. So the system enter deep sleep mode but when resume with trigger, m4 low power mode stop working i.e it doesn’t enter stop/wait mode again.
Probably something in suspend/resume of linux on A7 has changed m4 low power mode. Please help me with the root cause of this issue.


Which version of the BSP are you using? What module are you exactly using?

What happens exactly after waking up? Is there still serial output from the M4 core?