How to do the communication between the A core and M core on the i.MX8QM?

[charleshuang]

Hi NXP

Do you have SOP about "How to do the communication between the A core and M core on the i.MX8QM" ?

[Zhiming_Liu]

Hello,

Please refer 2.8 Remote Processor Messaging in this manual: https://www.nxp.com.cn/docs/en/reference-manual/IMX_REFERENCE_MANUAL.pdf

The M core sdk examples are here: https://github.com/nxp-mcuxpresso/mcux-sdk-examples/tree/main/mekmimx8qm/multicore_examples

To load it , you can refer 4.7.4 Running the Arm Cortex-M4/7/33 image in this guide:

https://www.nxp.com.cn/docs/en/user-guide/IMX_LINUX_USERS_GUIDE.pdf

Best Regards,
Zhiming

[charleshuang]

Hi @Zhiming_Liu 

We are trying to run the test M40.bin, which will display the PRMSG message on the M40.

We are trying to run "pingpong" and load the "imx_rpmsg_pingpong",  the device cannot get any message from M core and A core.

Have you tested the 'communication between the A core and M core' image for the i.MX8MQ demo board? 

Please share it with me, and we will test it.

[Zhiming_Liu]

Hello,

Are you using imx8qm-mek-rpmsg.dtb?

For the tty driver, you need install imx_rpmsg_tty.ko in /lib/modules, the you can use /dev/ttyRPMSG with echo "MESSAGE" > /dev/ttyRPMSG*. 

Best Regards,
Zhiming