RE: MCUBOOT UART pin numbers

rdolejs — Wed, 19 Oct 2022 01:57:28 GMT

Hi Vidar,

I tried the second approach and it worked. I left the mcuboot.conf file in the child_image directory and renamed mcuboot_dtc.overlay as nrf52840dk_nrf52840.overlay and placed it in the boards directory. The mcuboot uart pin numbers are now assigned correctly.

Thanks for your help,

Ray

RE: MCUBOOT UART pin numbers

Vidar Berg — Tue, 18 Oct 2022 08:23:08 GMT

Hello Ray,

mcuboot_DTC_OVERLAY_FILE and mcuboot_CONF_FILE must be set before find_package() and project() to be applied to the build. So, it should work if you move set() functions just below cmake_minimum_required(VERSION 3.20.0) line.

Another approach that does not involve changing cmakelist.txt is to use the naming convention described here: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_multi_image.html#image-specific-variables. This will make the build system apply the configs and overlays to the mcuboot child image automatically.

Example of how you can apply board specific configurations to the mcuboot build:

├── child_image
│   └── mcuboot
│       └── boards
│           ├── nrf52840dk_nrf52840.conf
│           └── nrf52840dk_nrf52840.overlay

Best regards,

Vidar