Porting child image based project to sysbuild

[C.Thilo]

Hi

We are currently porting a project with a custom board and custom netcore image to sysbuild.

My current problem is, that we have a custom project for the netcore image which was added to the appcore project via CMakeLists.txt and add_child_image.

How is this done via sysbuild nowadays?

The former child image needs to be build during appcore build and added to the domain netcore so sysbuild recognizes it.

I tried it with the sysbuild cmake file:

ExternalZephyrProject_Add(
    APPLICATION net_core
    SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/../netcore-project"
    BOARD pan_ng_module/nrf5340/cpunet
)

set_property(GLOBAL PROPERTY DOMAIN_APP_CPUNET net_core)
set(CPUNET_PM_DOMAIN_DYNAMIC_PARTITION net_core CACHE INTERNAL "")

add_dependencies(${DEFAULT_IMAGE} net_core)

But then there is the net_provision.hex which I don't know why it is produced!
Do I need to define the image for the netcore domain differently?

Thanks for any hint!

Cheers,
Thilo

[Einar Thorsrud]

Hi Thilo,

You normally only need to add a kconfig.sysbuild as explained under Adding custom network core images.

The creation of net_provision.hex does not indicate an issue I believe, as that is generated if you have secure boot for the net core enabled. See Migrating from multi-image builds to sysbuild. You do not get it if you disable secure boot for the network core with SB_CONFIG_SECURE_BOOT_NETCORE=n in sysbuild.conf.