Inquiry About nRF5340 Multi-core Build for Applications

[Ben_M]

Hi Nordic,

I am currently working with the nRF5340 and trying to understand the process of building applications in a multi-core setup.

From both the forum and official documentation, I learned that multi-core build is the default option, and that once "cpuapp" is selected as board option, both the application core and network core firmware should be built.

However, when I build the peripheral_nus sample, I only obtain the application core image, and no network core firmware is generated.

          

Could you please let me know if I am missing any steps or configurations to properly generate and include the network core firmware?

Thank you very much for your guidance.

Best regards,

[Vidar Berg]

Hi,

You are building the NUS sample from the Zephyr repository which does not include the network core FW by default. It's possible to modify the zephyr project to include the BT controller on the network core, but I'd recommend you start with the samples from the nRF folder first if you are just trying to get familiar with multi image builds. (e.g., nrf/samples/peripheral_uart). This is also covered in more detail in this course at https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-sysbuild/ 

Best regards,

Vidar

[Ben_M]

Hi Vidar,

Thank you for your previous guidance. Based on your suggestion, I was able to successfully run some nrf sample, and now both the application core and network core are working as expected.

However, I have encountered another issue when trying to use a custom overlay file with Sysbuild to override the network core device tree.

It seems that the changes in my custom overlay are not being applied successfully to the network core build.

Could you please clarify the correct procedure or steps required to ensure that a custom overlay file is properly applied to the network core when using Sysbuild? Am I missing a specific configuration or placement requirement?

I would greatly appreciate your advice.

Best regards,

Ben

[Ben_M]

I have found the answer in the tutorial. Thank you very much for your support. I will now close this ticket.

Best regards,

Ben