Shutting down the Cortex M4 core on the iMX7d processor

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Shutting down the Cortex M4 core on the iMX7d processor

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cnapolitano
Contributor I

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?

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655件の閲覧回数
karangajjar
Senior Contributor II

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:

Screenshot from 2020-01-22 12-23-35.png

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

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Bio_TICFSL
NXP TechSupport
NXP TechSupport

good!