sysbuild + MCUboot can't resolve SPI NOR symbols (NCS v2.7.0)

Question

I'm using Zephyr/NCS v2.7.0 with a custom multi-image project based on sysbuild . My top-level project has a sysbuild.conf at the root, and a sysbuild/ folder containing a mcuboot.conf that enables CONFIG_SPI_NOR=y , CONFIG_MULTITHREADING=y , etc. Despite this, building fails with an error like: 
 
 ``` /opt/toolchains/zephyr-sdk-0.16.1/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/drivers/flash/libdrivers__flash.a(spi_nor.c.obj):(.rodata.spi_nor_0_config+0x0): undefined reference to `__device_dts_ord_24' ``` 
 
 This implies MCUboot can't resolve the SPI NOR driver, even though it's configured and works in the main app. I've verified that CONFIG_SPI_NOR is enabled for MCUboot via build logs. 
 Project structure looks like this:

project/
 ├── sysbuild.conf 
 ├── CmakeLists.txt.conf 
 ├── prj.conf 
 ├── pm_static.yml 
 ├── sysbuild/
 │ └── mcuboot.conf 
 │ └── CMakeLists.txt 
 │ └── mcuboot.overlay Any ideas why the SPI NOR driver instance isn’t being linked correctly into MCUboot? Do I need to mirror the devicetree overlay into sysbuild/mcuboot.overlay , or manually define a node alias to make it resolve properly? I am happy to share the contents of any of these files on the public forum.

Håkon Alseth · Accepted Answer

Hi, 
 
 you can have a sysbuild.cmake file in your root directory, but it is strictly not required. 
 
 Your current error is related to the board root, ie cmake def. BOARD_ROOT, which you can specify when using west: 
 west build -b board_name/nrf52840 -- -DBOARD_ROOT=. 
 
 ando20 said: For now I will paste my current sysbuild/CMakeLists.txt: ``` 
 
 set (mcuboot_CONF_FILE ${CMAKE_CURRENT_LIST_DIR} /mcuboot.conf) 
 
 get_filename_component (CURRENT_DIR ${CMAKE_CURRENT_LIST_DIR} ABSOLUTE ) 
 
 # Get the parent directory 
 get_filename_component (PARENT_DIR ${CURRENT_DIR} DIRECTORY) 
 get_filename_component (APP_NAME ${PARENT_DIR} NAME ) 
 
 set (BOARD_ROOT ${PARENT_DIR} ) 
 find_package (Sysbuild REQUIRED HINTS $ENV{ZEPHYR_BASE} ) 
 project (sysbuild LANGUAGES) 
 You can set these in your application/CMakeLists.txt file instead of for the sysbuild images. 
 
 I have never seen a CMakeLists.txt directly in the sysbuild-folder, so that might be the reason why your build behaves so strange. 
 
 PS: You do not need to specify sysbuild/mcuboot.conf and .overlay. these should be picked up by the build system automatically when SB_CONFIG_BOOTLOADER_MCUBOOT=y is set. 
 
 Kind regards, 
 Håkon

sysbuild + MCUboot can't resolve SPI NOR symbols (NCS v2.7.0)

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