sysbuild: Add default (overridable) MCUboot Kconfigs without clock

nordicjm · nordicjm · commit f081eff70d71 · 2025-10-07T14:52:24.000+01:00
Disables some options including system clock support for MCUboot
to reduce the size of the application as they are not needed

Signed-off-by: Jamie McCrae &lt;jamie.mccrae@nordicsemi.no&gt;
diff --git a/sysbuild/CMakeLists.txt b/sysbuild/CMakeLists.txt
@@ -22,6 +22,7 @@ function(bm_install_setup)
       )
 
       add_overlay_dts(${SB_CONFIG_BM_FIRMWARE_LOADER_IMAGE_NAME} ${CMAKE_CURRENT_SOURCE_DIR}/image_configurations/FIRMWARE_LOADER_image_default.overlay)
+      add_overlay_config(mcuboot ${CMAKE_CURRENT_SOURCE_DIR}/image_configurations/BOOTLOADER_image_default.conf)
 
       # Enable LTO on MCUboot image
       add_overlay_config(mcuboot ${CMAKE_CURRENT_SOURCE_DIR}/image_configurations/lto.conf)
diff --git a/sysbuild/image_configurations/BOOTLOADER_image_default.conf b/sysbuild/image_configurations/BOOTLOADER_image_default.conf
@@ -0,0 +1,9 @@
+CONFIG_KERNEL_MEM_POOL=n
+CONFIG_CURRENT_THREAD_USE_TLS=n
+CONFIG_ERRNO=n
+CONFIG_FP16=n
+CONFIG_HW_STACK_PROTECTION=n
+CONFIG_BUILTIN_STACK_GUARD=n
+CONFIG_TIMEOUT_64BIT=n
+CONFIG_SYS_CLOCK_EXISTS=n
+CONFIG_NRF_GRTC_START_SYSCOUNTER=n

Original file line number	Diff line number	Diff line change
`@@ -22,6 +22,7 @@ function(bm_install_setup)`
`22`	`22`	`)`
`23`	`23`
`24`	`24`	`add_overlay_dts(${SB_CONFIG_BM_FIRMWARE_LOADER_IMAGE_NAME} ${CMAKE_CURRENT_SOURCE_DIR}/image_configurations/FIRMWARE_LOADER_image_default.overlay)`
	`25`	`+ add_overlay_config(mcuboot ${CMAKE_CURRENT_SOURCE_DIR}/image_configurations/BOOTLOADER_image_default.conf)`
`25`	`26`
`26`	`27`	`# Enable LTO on MCUboot image`
`27`	`28`	`add_overlay_config(mcuboot ${CMAKE_CURRENT_SOURCE_DIR}/image_configurations/lto.conf)`