IMX7 cortex-m4 low power mode

Technical Support
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1

Hello,

I tried with the low power mode example for imx7 as below:
freertos-colibri-imx7/examples/imx7_colibri_m4/demo_apps/low_power_imx7d
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.

Thanks,
Bryce

2

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?