CMake: program SoftDevice with application when not using bootloader

Add a new Kconfig option CONFIG_PROGRAM_SOFTDEVICE_WITH_APP.
When enabled, the SoftDevice hex will be programmed together with
the application image. This only applies to the none MCUboot board
variants.

For the MCUboot board variants, the SoftDevice is already programmed
together with the MCUboot bootloader.

Signed-off-by: Andreas Moltumyr <[email protected]>

Author: anhmolt

CMakeLists.txt

@@ -7,6 +7,7 @@
 if(CONFIG_NCS_BM)
   zephyr_include_directories(include)
 
+  include(cmake/merge_app_softdevice.cmake)
   include(cmake/version.cmake)
 
   add_subdirectory(drivers)

Kconfig.nrf_bm

@@ -17,4 +17,13 @@ rsource "samples/Kconfig"
 rsource "subsys/Kconfig"
 # zephyr-keep-sorted-stop
 
+config PROGRAM_SOFTDEVICE_WITH_APP
+	bool "Program SoftDevice together with application (none MCUboot board variant)"
+	depends on !BOOTLOADER_MCUBOOT
+	depends on SOFTDEVICE
+	default y
+
+config SOFTDEVICE_FILE
+	string "SoftDevice file (DO NOT ALTER)"
+
 endif # NCS_BM

cmake/merge_app_softdevice.cmake

@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+if(CONFIG_PROGRAM_SOFTDEVICE_WITH_APP)
+  add_custom_target(app_softdevice_merged
+    ALL
+    DEPENDS ${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}_softdevice_merged.hex
+  )
+
+  add_custom_command(OUTPUT ${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}_softdevice_merged.hex
+    COMMAND
+    ${PYTHON_EXECUTABLE}
+    ${ZEPHYR_BASE}/scripts/build/mergehex.py
+    -o ${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}_softdevice_merged.hex
+    ${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}.hex
+    ${CONFIG_SOFTDEVICE_FILE}
+    DEPENDS
+    ${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}.hex
+    ${CONFIG_SOFTDEVICE_FILE}
+  )
+
+  set_target_properties(runners_yaml_props_target PROPERTIES "hex_file"
+    "${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}_softdevice_merged.hex"
+  )
+  set(BYPRODUCT_KERNEL_APP_SD_HEX_NAME
+    "${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}_softdevice_merged.hex"
+    CACHE FILEPATH "Application with SoftDevice hex file" FORCE
+  )
+
+endif()

sysbuild/image_configurations/MAIN_image_default.cmake

@@ -24,3 +24,5 @@ if(SB_CONFIG_BM_BOOTLOADER_MCUBOOT)
     set_config_bool(${ZCMAKE_APPLICATION} CONFIG_MCUBOOT_BOOTLOADER_MODE_SINGLE_APP y)
   endif()
 endif()
+
+set_config_string(${ZCMAKE_APPLICATION} CONFIG_SOFTDEVICE_FILE "${SB_CONFIG_SOFTDEVICE_FILE}")