MCMGR Reboot Crashing M4 Core

[D_TTSA]

Good day

In my project, I am restarting the M4 core of the RT1176 processor.

In certain conditions, I want the M4 to continually restart. However, it seems like there is a problem in the SDK for this.

You can reproduce this problem on the MIMXRT1170-EVK quite easily. You will need to load the evkmimxrt1170_multicore_manager_cm7 project and the associated evkmimxrt1170_multicore_manager_cm4 project. Then, comment out line 180 and line 196 of the project's mcmgr_core0.c. Load this to the EVK and run it.

This adjustment will make the processor continually stop the M4 core, wait 1s, then start the M4 core and wait 1s. 

After some time (about 5 minutes maximum), you can see from the UART terminal output that the M4 core is no longer producing a CoreUpEvent, because "Secondary core is in startup code" is not printed anymore.

Could NXP's technical team please have a look at this.

[D_TTSA]

Bump @kerryzhou

[jingpan]

Hi @D_TTSA ,

This is a strange problem. I'm looking into it. Please wait several days.

Regards,

Jing

[D_TTSA]

Hi @jingpan 

Thanks for your reply. Could you please provide an update?

Kind regards

[jingpan]

Hi @D_TTSA ,

Sorry, we are still checking this issue.

Regards,

Jing

[jingpan]

Hi @D_TTSA ,

The issue is related to cache coherency on the CM4. It is a bug in our SDK drivers. The SDK team is currently working on a fix. A temporary solution that seems to do the trick is to disable the System and Code caches on the CM4.

• include fsl_cache.h in mcmgr_core1.c
• insert L1CACHE_DisableSystemCache(); and  L1CACHE_DisableCodeCache(); in mcmgr_core1.c after BOARD_ConfigMPU();

Best Regards,

Jing

[D_TTSA]

Hi @jingpan 

Thank you for the update. Could you please estimate when this update to the SDK will be made?

If you are not sure, could you perhaps say which version of the SDK it would be included in? v2.??.??

Kind regards

[jingpan]

Hi @D_TTSA ,

Sorry I don't know.

Regards,

Jing