Shutting down the Cortex M4 core on the iMX7d processor

[cnapolitano]

Our device is currently not utilizing the Cortex M4 core on the i.MX7d processor. Is there any means (GPIO, SMBus,etc.) to power off the Cortex M4 core?

[karangajjar]

Hi Cameron Napolitano,

As mentioned in the i.MX7D RM section 4.2.5 Cortex-M4 Boot requirement, Cortex-A7 is responsible for enabling and providing clock to Cortex-M4, please see the image below:

Taking clue from the last point, using the SRC_M4RCR(M4 Reset Control Register) register's 3rd bit (ENABLE_M4) we can enable/disable M4.

Regards,

Karan Gajjar

[Bio_TICFSL]

good!