Twister cannot find custom out-of-tree board

RE: Twister cannot find custom out-of-tree board

cedric.gerber — Thu, 08 Jan 2026 12:45:38 GMT

Short update, I've finally found the issue, it was due to the naming of the files, it has to be yaml and not yml. (I thought I tried this, but got mixed up with the out of tree board files).

Would be nice to have the same parser mechanism for build and test : )

RE: Twister cannot find custom out-of-tree board

Håkon Alseth — Fri, 14 Nov 2025 11:48:38 GMT

Hi,

[quote user="cedric.gerber"]Do you know which community is the best? [/quote]

If you have issues reaching out to the community, it might be beneficial to join their discord server and ask there.

Kind regards,

Håkon

RE: Twister cannot find custom out-of-tree board

cedric.gerber — Thu, 13 Nov 2025 12:37:33 GMT

Hi, thanks for the feedback. Do you know which community is the best?

I opened a discussion in githhub: https://github.com/zephyrproject-rtos/zephyr/discussions/99209

RE: Twister cannot find custom out-of-tree board

Håkon Alseth — Tue, 11 Nov 2025 13:26:36 GMT

Hi,

You could try the same procedure with the custom board given in the example-application:

https://github.com/zephyrproject-rtos/example-application

[quote user="cedric.gerber"]

I just tried to duplicate my board directory to "C:\ncs\v3.1.1\zephyr\boards"

Now I get the error:

ERROR: Board(s): {'RoomzDisplay'}, defined multiple times.
Last defined in C:\workspace\gen3\boards\roomz\roomzdisplay\board.yml

[/quote]

You need to remove it from the zephyr/boards folder if you want to use it as a out-of-tree board.

[quote user="cedric.gerber"]I suppose the error is actually not due to being out of tree, but the parsing of the board files with twister? The build is ok.[/quote]

I suspect this as well. I would recommend that you contact the zephyr community related to twister issues.

Kind regards,

Håkon

RE: Twister cannot find custom out-of-tree board

cedric.gerber — Mon, 10 Nov 2025 13:58:19 GMT

Hi, thanks for you reply!

Yes I did use "--board-root ."

I just tried to duplicate my board directory to "C:\ncs\v3.1.1\zephyr\boards"

Now I get the error:

ERROR: Board(s): {'RoomzDisplay'}, defined multiple times.
Last defined in C:\workspace\gen3\boards\roomz\roomzdisplay\board.yml

This seems to indicate the board location is parsed correctly.

But when I remove the --board-root . I get:

ERROR - platform_allow in RoomzDisplay.power.sleep - unrecognized platform - RoomzDisplay/nrf5340/cpuapp

I suppose the error is actually not due to being out of tree, but the parsing of the board files with twister? The build is ok.

I've tried to rename my .yml files to .yaml as I saw a comment saying it could cause issues. It did not help.

Any idea what could cause the issue?

RE: Twister cannot find custom out-of-tree board

Håkon Alseth — Mon, 10 Nov 2025 08:43:06 GMT

Hi,

Have you tried passing the "BOARD_ROOT" parameter to the twister application, as per its expected syntax listed here?

https://docs.zephyrproject.org/latest/develop/test/twister.html

Based on searches in zephyr's "issues" threads, this feature will require specific settings in zephyr/module.yml as well:

https://github.com/zephyrproject-rtos/zephyr/discussions/67674

https://github.com/zephyrproject-rtos/zephyr/issues/38047

Kind regards,

Håkon