Communication Latency between A53 and M4.

[noufal_p]

Hi, i have imx8m mini evk and i have tested communication between A53 and M4 using RPMsg. I would like to know the methods that can be used to measure communication latency between A53 and M4?

Thanks 

Noufal P

[fabianmpa019]

Hi,

What Kernel version and Yocto release are you using?

[diegoadrian]

Hello,

Unfortunately, it could be possible, but it will not be an easy task.

If you go to the MU part of the reference manual, you can find that there is a flag that changes the state when the transmission between cores is finished. You will need to create a code in the M4 cortex that could detect when the flag changed.

The name of the register is Processor x Status Register (MUx_ASR).

However, in the code, you will need to play with the timers and interrupts to handle this operation. Unfortunately, this is out of our scope.

I apologize for the inconvenience this may give you.

Best regards,

Diego.