Hello,
I currently have an app using nRF Connect SDK v2.5.0. To enable FOTA I set CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU and CONFIG_BOOTLOADER_MCUBOOT in my prj.conf (following the documentation instructions).
After this building the app fails during linking for 3 different undefined references:
[275/280] Linking C executable zephyr/zephyr_pre0.elf FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map : && ccache /home/q/app/zephyr_workspace/toolchains/7795df4459/opt/zephyr-sdk/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc -gdwarf-4 zephyr/CMakeFiles/zephyr_pre0.dir/misc/empty_file.c.obj -o zephyr/zephyr_pre0.elf -fuse-ld=bfd -T zephyr/linker_zephyr_pre0.cmd -Wl,-Map=/home/q/app/zephyr_workspace/my_app/build/mcuboot/zephyr/zephyr_pre0.map -Wl,--whole-archive app/libapp.a zephyr/libzephyr.a zephyr/arch/common/libarch__common.a zephyr/arch/arch/arm/core/aarch32/libarch__arm__core__aarch32.a zephyr/arch/arch/arm/core/aarch32/cortex_m/libarch__arm__core__aarch32__cortex_m.a zephyr/arch/arch/arm/core/aarch32/cortex_m/cmse/libarch__arm__core__aarch32__cortex_m__cmse.a zephyr/arch/arch/arm/core/aarch32/mpu/libarch__arm__core__aarch32__mpu.a zephyr/lib/libc/minimal/liblib__libc__minimal.a zephyr/lib/libc/common/liblib__libc__common.a zephyr/soc/soc/arm/common/cortex_m/libsoc__arm__common__cortex_m.a zephyr/drivers/clock_control/libdrivers__clock_control.a zephyr/drivers/console/libdrivers__console.a zephyr/drivers/flash/libdrivers__flash.a zephyr/drivers/gpio/libdrivers__gpio.a zephyr/drivers/pinctrl/libdrivers__pinctrl.a zephyr/drivers/serial/libdrivers__serial.a zephyr/drivers/timer/libdrivers__timer.a modules/nrf/lib/fprotect/lib..__nrf__lib__fprotect.a modules/nrf/lib/fatal_error/lib..__nrf__lib__fatal_error.a modules/nrf/subsys/pcd/lib..__nrf__subsys__pcd.a modules/nrf/drivers/hw_cc310/lib..__nrf__drivers__hw_cc310.a modules/mcuboot/boot/bootutil/zephyr/libmcuboot_util.a modules/mbedtls/libmbedTLSBase.a modules/mbedtls/libmbedTLSCrypto.a modules/mbedtls/libmbedTLSX509.a modules/mbedtls/libmodules__mbedtls.a modules/hal_nordic/nrfx/libmodules__hal_nordic__nrfx.a -Wl,--no-whole-archive zephyr/kernel/libkernel.a zephyr/CMakeFiles/offsets.dir/./arch/arm/core/offsets/offsets.c.obj -L"/home/q/app/zephyr_workspace/toolchains/7795df4459/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/thumb/v8-m.main/nofp" -L/home/q/app/zephyr_workspace/my_app/build/mcuboot/zephyr -lgcc zephyr/arch/common/libisr_tables.a modules/mbedtls/libmbedTLSBase.a modules/mbedtls/libmbedTLSCrypto.a modules/mbedtls/libmbedTLSX509.a -mcpu=cortex-m33 -mthumb -mabi=aapcs -mfp16-format=ieee -Wl,--gc-sections -Wl,--build-id=none -Wl,--sort-common=descending -Wl,--sort-section=alignment -Wl,-u,_OffsetAbsSyms -Wl,-u,_ConfigAbsSyms -nostdlib -static -Wl,-X -Wl,-N -Wl,--orphan-handling=warn -Wl,-no-pie /home/q/app/zephyr_workspace/nrfxlib/crypto/nrf_cc312_platform/lib/cortex-m33/soft-float/no-interrupts/libnrf_cc312_platform_0.9.18.a && cd /home/q/app/zephyr_workspace/my_app/build/mcuboot/zephyr && /home/q/app/zephyr_workspace/toolchains/7795df4459/usr/local/bin/cmake -E true /home/q/app/zephyr_workspace/toolchains/7795df4459/opt/zephyr-sdk/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): in function `k_sleep': /home/q/app/zephyr_workspace/my_app/build/mcuboot/zephyr/include/generated/syscalls/kernel.h:135: undefined reference to `z_impl_k_sleep' /home/q/app/zephyr_workspace/toolchains/7795df4459/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: /home/q/app/zephyr_workspace/my_app/build/mcuboot/zephyr/include/generated/syscalls/kernel.h:135: undefined reference to `z_impl_k_sleep' /home/q/app/zephyr_workspace/toolchains/7795df4459/opt/zephyr-sdk/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_config_0+0x0): undefined reference to `__device_dts_ord_142' collect2: error: ld returned 1 exit status ninja: build stopped: subcommand failed.
Removing CONFIG_BOOTLOADER_MCUBOOT resolves the issue.
I'm building for board: nrf7002dk_nrf5340_cpuapp
