nRF5340-DK: add/change configuration of network core bootloader (b0n)

[mguc]

For some reason my ticket got deleted earlier, so here I go again.

I'm trying to change the configuration of the network core bootloader. For the `hci_rpmsg` and `mcuboot` child images I can just add `prj.conf` in the `child_image` folder if I want to add my own configuration:

child_image/
    hci_rpmsg/
        prj.conf
    mcuboot/
        prj.conf

Doing the same thing for the network core bootloader image (b0n) doesn't work:

child_image/
    b0n/
        prj.conf

So how can I change the configuration of the network core bootloader? I'm using the nRF Connect SDK v2.0.0.

Thanks in advance.
Marko

[Sigurd Hellesvik]

Hi Marko,

In our build system, the net core code is a child image for the application.
Netboot is a child image of the net core child image, so we have nested child images.

To configure netboot(b0n), we can use this technique to set Variables in child images, but nested like this:

 -Dhci_rpmsg_b0n_CONFIG_DEBUG=y

You can also set this in CMakeLists.txt using the set() function.

Regards,
Sigurd Hellesvik