iMX93 read ADC using CM33

[ptremante]

Hi NXP Team,

I'm working with the imx93_evk_11x11 board and have built a custom image with LF 6.6.x kernel and the Scarthgap Yocto release.

My goal is to test adc1 on the CM33 core, so I downloaded the MCUXpresso SDK and built the `sar_adc/polling` example.

The problem occurs when I load the firmware using `remoteproc`:

echo -n adc_polling_cm33.elf > /sys/class/remoteproc/remoteproc0/firmware
echo -n start > /sys/class/remoteproc/remoteproc0/state

At that point, everything freezes, both the A55 and CM33 cores.
On the CM33 debug UART I only see the first message:
`ADC polling example`
…then the system hangs and I have to reboot the board.

I tested the same firmware from U-Boot and it works perfectly, so I suspect a conflict with some kernel configuration.
I also tried disabling the `adc1` node in the device tree, but the issue persists.

Has anyone successfully run the ADC examples on CM33 with this EVK?
Am I missing something that should be disabled on the A55 side?
Any help or suggestions would be greatly appreciated!

Thanks a lot!

Pasquale

[JorgeCas]

Hello,

This could be caused by a peripheral conflict between Cortex-M and Cortex-A cores since are trying to access at the same peripheral simultaneously.

You can use this post as reference:

Test SAI3 while running M7 firmware with remoteproc

Best regards.