sysbuild: Add image selection for PPR core images

Allows selecting a core to be built for the PPR core on supported
devices, with empty as the only user selectable image

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

sysbuild/CMakeLists.txt

@@ -902,6 +902,7 @@ include(ncs_sysbuild_extensions)
 include(${CMAKE_CURRENT_LIST_DIR}/extensions.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/appcore.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/netcore.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/pprcore.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/secureboot.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/mcuboot.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/hpf.cmake)

sysbuild/Kconfig.pprcore

@@ -6,6 +6,56 @@ config SUPPORT_PPRCORE
 	bool
 	default y if SOC_NRF54H20_CPUAPP
 
+if SUPPORT_PPRCORE
+
 config PPRCORE_REMOTE_BOARD_TARGET_CPUCLUSTER
 	string
 	default "cpuppr" if SOC_NRF54H20_CPUAPP
+
+menu "Peripheral processor core (PPR) configuration"
+	depends on SUPPORT_PPRCORE
+
+config SUPPORT_PPRCORE_EMPTY
+	bool
+	default y
+
+config DEFAULT_PPRCORE_EMPTY
+	bool
+
+choice PPRCORE
+	prompt "PPR core image"
+	default PPRCORE_EMPTY if DEFAULT_PPRCORE_EMPTY && PPRCORE_REMOTE_BOARD_TARGET_CPUCLUSTER != ""
+	depends on SUPPORT_PPRCORE
+
+config PPRCORE_NONE
+	bool "None"
+	help
+	  Do not include a PPR core image in the build.
+
+config PPRCORE_EMPTY
+	bool "Empty"
+	depends on SUPPORT_PPRCORE_EMPTY
+	help
+	  Include empty image as the PPR core image to use.
+
+endchoice
+
+if !PPRCORE_NONE
+
+config PPRCORE_IMAGE_NAME
+	string
+	default "empty_ppr_core" if PPRCORE_EMPTY
+	help
+	  Name of PPR core image.
+
+config PPRCORE_IMAGE_PATH
+	string
+	default "$(ZEPHYR_NRF_MODULE_DIR)/samples/basic/empty" if PPRCORE_EMPTY
+	help
+	  Source directory of PPR core image.
+
+endif # !PPRCORE_NONE
+
+endmenu
+
+endif # SUPPORT_PPRCORE

sysbuild/pprcore.cmake

@@ -0,0 +1,22 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+
+# Include PPR core image if enabled
+if(SB_CONFIG_SUPPORT_PPRCORE AND NOT SB_CONFIG_PPRCORE_NONE AND DEFINED SB_CONFIG_PPRCORE_IMAGE_NAME)
+  # Calculate the PPR core board target
+  string(REPLACE "/" ";" split_board_qualifiers "${BOARD_QUALIFIERS}")
+  list(GET split_board_qualifiers 1 target_soc)
+  list(GET split_board_qualifiers 2 target_cpucluster)
+  set(board_target_pprcore "${BOARD}/${target_soc}/${SB_CONFIG_PPRCORE_REMOTE_BOARD_TARGET_CPUCLUSTER}")
+  set(target_soc)
+  set(target_cpucluster)
+
+  ExternalZephyrProject_Add(
+    APPLICATION ${SB_CONFIG_PPRCORE_IMAGE_NAME}
+    SOURCE_DIR ${SB_CONFIG_PPRCORE_IMAGE_PATH}
+    BOARD ${board_target_pprcore}
+    BOARD_REVISION ${BOARD_REVISION}
+  )
+endif()