Multicore sample for the 54L15

[ovrebekk]

Hi 

Long time no see

I recently got my sweaty hands on a sparkly new 54L15DK, and I thought I would try it out. The AI guided me to the coremark sample and the multicore/hello_word sample, but I couldn't find the hello_world sample anywhere in NCS v2.8.0. Is this sample no longer included? 

I am looking for a very basic sample showing how to enable the two cores, and exchange data between them. 

Best regards
Torbjørn

[Hieu]

Hi Torbjørn,

The AI is confused. The sample you want is zephyr\samples\sysbuild\hello_world.

Exchanging data between them is unfortunately not demonstrated there though :/

Best regards,

Hieu

[Hieu]

Hi Torbjørn,

For communication between the cores, you use IPC, same as the nRF5340. The sample is here: sdk-zephyr/samples/subsys/ipc/ipc_service/icmsg at v3.7.99-ncs1 · nrfconnect/sdk-zephyr

You will also need to use the snippet nordic-flpr.

See also:

Snippets
sdk-zephyr/snippets/nordic-flpr at v3.7.99-ncs1 · nrfconnect/sdk-zephyr

Best regards,

Hieu

[ovrebekk]

Hi Hieu

Thanks a lot for the clarification. 

Do you know how I should build the sample then? 

I tried building the ipc_service/icmsg sample for the 54L appcore with the nordic-flpr snippet selected, but this won't work:

I tried attaching the build log, but attaching files or text is not really working today

Are you supposed to build the sample twice, once for each core, or will sysbuild ensure that a single build can target both the appcore and the FLPR core?

Best regards
Torbjørn

[Hieu]

Hi Torbjørn,

The snippet needs to be applied only to the cpuapp. When you provide snippet like that, it gets applied to all images.

You will need to use the extra CMake argument menu instead and then put the <application name>_ between -D and SNIPPET, like when you add an extra Kconfig only to a specific image.

For example, my application folder is named icmsg_280, so I specified -Dicmsg_280_SNIPPET=nordic-flpr.

And then you build the sample just once with sysbuild. The remote image will be built automatically from the sysbuild setup. Flashing will also automatically include both cores.

Getting to this point isn't straight forward, sorry. I will relay this experience with the relevant team.

Best regards,

Hieu

[AndriiHere]

this is actually works!! how did you even figured this out? where can I find documentation about building for flpr core?

[Hieu]

The documentation on working with FLPR core is here: Working with the FLPR core.