MIMXRT1176 CM4 standalone flash/debug issue – PC register write failure (E22)

meetbhatt2113 — Wed, 24 Dec 2025 09:51:21 GMT

Hello NXP Team

I am working with the i MX RT 1176 using MCUXpresso IDE and I am trying to flash and debug a CM4 application by itself

The CM4 project builds successfully but during the flash or debug launch the process fails during the download stage and the debugger reports that it cannot write the program counter register and returns an E22 failure

The error occurs before the application begins execution

I am only able to reproduce this issue when attempting to flash or debug the CM4 core directly
A CM7 application flashes and runs correctly on the same board

Based on my understanding the CM4 core depends on CM7 for flash initialization and system setup before CM4 is released

I would like to ask whether this behavior is expected when attempting to flash or debug the CM4 core in standalone mode on the RT1176

I would also like confirmation on the recommended workflow for loading and debugging CM4 applications on this device

Finally, I would like to know whether the E22 failure indicates that the CM4 core has not yet been released or clocked by CM7

Any guidance from the NXP team would be greatly appreciated

Thank you for your time and support

Re: MIMXRT1176 CM4 standalone flash/debug issue – PC register write failure (E22)

Gavin_Jia — Thu, 25 Dec 2025 09:18:55 GMT

Hi @meetbhatt2113 ,

Thanks for your interest in NXP MIMXRT series!

For CM4 applications, they must be linked to run from RAM rather than flash. You may use the multicore examples provided in the SDK as reference, where CM7 acts as the master core.

If you need to develop and debug CM4 applications, please follow the multicore example approach where CM7 prepares and launches the CM4 application. Additionally, this AN is a good reference:https://www.nxp.com/docs/en/application-note/AN13264.pdf

Best regards,
Gavin

topic MIMXRT1176 CM4 standalone flash/debug issue – PC register write failure (E22) in Other NXP Products

MIMXRT1176 CM4 standalone flash/debug issue – PC register write failure (E22)

Re: MIMXRT1176 CM4 standalone flash/debug issue – PC register write failure (E22)