Use SPI from DTS in MCUBOOT

RE: Use SPI from DTS in MCUBOOT

Tom H. — Wed, 10 Dec 2025 13:15:50 GMT

Thats it, thank you.

RE: Use SPI from DTS in MCUBOOT

Vidar Berg — Wed, 10 Dec 2025 12:42:23 GMT

Hello Tom,

The warning isn't particularly helpful in this case. But the problem is the spi driver fails to be included in the build due a missing dependency on CONFIG_MULTITHREADING being enabled. This requirement has since been removed: https://github.com/zephyrproject-rtos/zephyr/commit/df65918cfa51d355095571b607e1f23cfb794e23

Adding CONFIG_MULTITHREADING=y to your mcuboot.conf file should fix your build error.

Best regards,

Vidar

RE: Use SPI from DTS in MCUBOOT

Tom H. — Tue, 09 Dec 2025 15:12:29 GMT

Hello Vidar,

thanks for oyur reply. I am certain that CONFIG_SPI=y is set. Find attached the generated autoconf.h and devicetree_generated.h from the 'build\mcuboot\zephyr\include\generated\zephyr' directory.

devzone.nordicsemi.com/.../4744.autoconf.h devzone.nordicsemi.com/.../0844.devicetree_5F00_generated.h

But you are right about a previous warning:

CMake Warning at C:/ncs/v2.9.0/zephyr/CMakeLists.txt:952 (message):
  No SOURCES given to Zephyr library: drivers__spi

  Excluding target from build.


CMake Warning at C:/ncs/v2.9.0/zephyr/CMakeLists.txt:952 (message):
  No SOURCES given to Zephyr library: ..__nrf__subsys__fw_info

  Excluding target from build.

Am I missing an additional configuration entry?

BR, Tom

RE: Use SPI from DTS in MCUBOOT

Vidar Berg — Tue, 09 Dec 2025 14:28:41 GMT

Hello Tom,

Please check the .config file in build/mcuboot/zephyr/ to confirm that CONFIG_SPI actually ended up being enabled for the bootloader. You may also want to double check that there aren't any warnings in the build log above the linker error.

Best regards,

Vidar