NRF5340 multicore image dfu package not have net core binary

[ErDarshan]

Hi,

I am using NRF5340DK and NCS2.1.0. I am able to have network core source code in my application using multicore (https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_multi_image.html). 

But I would like to have bin file of custom net core inside zephyr and dfu_package zip file. Please suggest a way to do it.

[Sigurd Hellesvik]

Hi,

Here are two samples I have made to do DFU for the nRF5340:

https://github.com/hellesvik-nordic/samples_for_nrf_connect_sdk/tree/main/bootloader_samples/nrf5340

Is this the kind of inspiration you are looking for?

Regards,
Sigurd Hellesvik

[ErDarshan]

Thanks for the response.

My question may not be clear. When we build NRF5340, it gets NCS hci_rpmsg sample application as network core.
I would like to get rid of it and so I added multi image build in my application code base which add child image as my own network core applicaiton.

I am able to do it but custom network core application (which is inside application code directory) binary is not available in dfu_package.zip. 
So my question is while adding child image, how we can specify binary name and path of child image. Also how we can add it inside zip.

[Sigurd Hellesvik]

Aha, I think I understand now!

I will try to reproduce this myself and return with what I found on Monday.

Regards,
Sigurd Hellesvik

[ErDarshan]

Thanks.

Please update if you get success. Any example code is appreciated!!!

[Sigurd Hellesvik]

Hi,

Try to add the following to your prj.conf (of application)

CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_NRF53_UPGRADE_NETWORK_CORE=y

I tested this on nrf/samples/nrf5340/multicore, and it seems to work here.

Regards,
Sigurd Hellesvik

[ErDarshan]

Thanks for the reply. Yet I am not sure what is working at your end. I think still there is gap in understanding. Let me share example code with more explanation and expectations.

Here is my updated smp_svr example. In default example, I have added logic to use my custom netcore firmware (same as multicore)

6518.smp_svr.zip

Now, after building smp_svr for ble, I can find two binary files inside build/cpunet/zephyr as shown below,

Now, when I try to update network core using zephyr.bin or signed_by_b0_app.bin, I am getting below error,

And also image is not included in dfu_application.zip which is found inside build/zephyr/.

My expectation is to have upgradable bin file which I can provide for update and also the same file should be included inside dfu_application.zip.

Please let me know if you have any query for my issue or expectation. Please share your suggestions or updated smp_svr code to accomplish my expectations.

[Sigurd Hellesvik]

Hi,

You are right on two accounts:

Firstly, I should have been more clear about my "seems to work here".
What I meant is that I could see that dfu_application.zip is generated.

Secondly, I see now that dfu_application.zip only contains app_update.bin, so it will not update the network core.

I will keep on looking into this.

Regards,
Sigurd Hellesvik