imx8mp stop m4 when app runs

[xjy198903]

How can I reliably stop the program running on the M4 core while executing user applications on the A53 core of the imx8mp? I need to perform some specific tests without modifying the device tree or other settings, as the M4 core automatically restarts after a reboot. This way, the M4 core can continue to operate normally when I’m not conducting tests.

[danielchen]

Hi Xjy:

You  can try to use below commands.

For example,  disable CPU1

echo 0 > /sys/devices/system/cpu/cpu1/online

below command to enable CPU 1

echo 1 > /sys/devices/system/cpu/cpu1/online

Regards

Daniel

[xjy198903]

Hi,

I just want to stop cortex-m4 not an A53 core of imx8mp，when running services on imx8mp

[danielchen · Accepted solution]

For M core, you can try

echo stop > /sys/devices/platform/imx8mp-cm7/remoteproc/remoteproc0/state

Regards

Daniel