How to overlay b0n config in CMake?

[CodeLoader]

Hello, we have a project in nRF Connect SDK, where we'd like to use a separate .conf file for b0n subimage in a multi-image build,

Let's say it's called b0n.conf. So, before any add_child_image is called, this line in CMakeLists.txt is invoked:

add_overlay_config(b0n ${CMAKE_CURRENT_SOURCE_DIR}/child_image/b0n.conf)

.But later in nrf/cmake/multi_image.cmake the following command is called, which overwrites b0n.confL

add_overlay_config(
    ${ACI_NAME}
    ${NRF_DIR}/subsys/partition_manager/partition_manager_enabled.conf
    )

As the result, the overlay config values are not applied. How can this be resolved?

[Simon]

I'll look into this

In the meanwhile, if you're having issues with add_overlay_config() you could use this approach instead. Like explained by Håkon in this post. You could also set specific configs of a child image like I demonstrated in this reply.

Best regards,

Simon

[CodeLoader]

Thanks for the response
I'm not sure what to look at the github repository of mcuboot, from the first link
The second link doesn't open correctly for me
Also it's not a problem to change mcuboot.conf, this works fine. The problem is specifically with b0n.

[Simon]

Modify configurations of child images using a child_image folder (continuation)

What I said initially about the file hello_world/child_image/mcuboot/boards/nrf52840dk_nrf52840.conf is not correct. As explained in Multi-image builds → Image-specific variables, this file will override the file <ncs location>/bootloader/mcuboot/boot/zephyr/boards/nrf52840dk_nrf52840.conf (however in this specific case there are no such file). The file hello_world/child_image/mcuboot/boards/nrf52840dk_nrf52840.conf also requires a file hello_world/child_image/mcuboot/prj.conf to be present.

To simply overlay the present configurations of mcuboot you can add the file hello_world/child_image/mcuboot.conf

[msedlak]

Basically, it means, when you want to use SMP server for nRF5340, which uses hci_rpmsg as a child image, and the hci_rpsmg uses nordic's secure bootloader (b0n) as a child image, you are not able to configure the b0n, because there is no way how to this.

So I guess the only solution is to have 2 separate projects - one as your application (eg. providing SMP server) and the second the hci_rpmsg, for which one you can simply modify the child_image configuration for b0n.

Is there a way how to prevent the SMP sample from building/erasing/loading the network core?
Otherwise, you would have to load the full SMP sample and then again load the network core with your customized hci_rpmsg sample

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[Simon]

 msedlak 

Can you test this: -Dhci_rpmsg_b0n_<config symbol>=y from the main app core sample? For example -Dhci_rpmsg_b0n_CONFIG_DEBUG=y.

Let me know if this works or not

Best regards,

Simon

[msedlak]

Hi,
I can confirm, this solution works, and you are able to pass CONFIG_ option directly to "sub-child" image. 
I have tried to add overlay file for configuration (-Dhci_rpmsg_b0_OVERLAY_CONFIG=b0n.conf), but this leads (of course) to "/nrf/samples/nrf5340/netboot/b0n.conf" ... I wasn't able to change the path of the b0n.conf by direct using of -D command 
But using set() directly in CMakeLists.txt, I'm able to pass directly my customized .conf file for the b0n

Location of my b0n.conf file:

set command in CMakeLists.txt:

SET(hci_rpmsg_b0n_OVERLAY_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/b0n_config/b0n.conf")

Build Output:

You can pass your customized .conf file for the b0n  

TRANSLATE with x

English

Arabic	Hebrew	Polish
Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian

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[Simon]

I'm glad the solution worked for you, and thanks for sharing your additional findings!