sysbuild: sdp: Use Kconfig to specify FLPR image path

Specifying the FLPR image path in Kconfig makes it easier
to select the SDP FLPR core image and allows the use of
external SDP images.

Signed-off-by: Jakub Zymelka <jakub.zymelka@nordicsemi.no>

Author: jaz1-nordic

sysbuild/Kconfig.sdp

@@ -39,6 +39,13 @@ endchoice
 
 endif # SDP_GPIO
 
+config SDP_IMAGE_PATH
+	string
+	default "${ZEPHYR_NRF_MODULE_DIR}/applications/sdp/gpio" if SDP_GPIO
+	default "${ZEPHYR_NRF_MODULE_DIR}/applications/sdp/mspi" if SDP_MSPI
+	help
+	  Source directory of SDP image.
+
 endif # SDP
 
 endmenu

sysbuild/sdp.cmake

@@ -9,22 +9,12 @@ if(SB_CONFIG_SDP)
   set(board_target_flpr "${BOARD}/${target_soc}/cpuflpr")
   set(target_soc)
 
-  # Select the SDP application
-  if(SB_CONFIG_SDP_GPIO)
-    set(sdp_app_dir "${ZEPHYR_NRF_MODULE_DIR}/applications/sdp/gpio")
-  elseif(SB_CONFIG_SDP_MSPI)
-    set(sdp_app_dir "${ZEPHYR_NRF_MODULE_DIR}/applications/sdp/mspi")
-  else()
-    message(FATAL_ERROR "Unknown SDP application type")
-  endif()
-
   # Include the SDP application in the build
   ExternalZephyrProject_Add(
     APPLICATION sdp
-    SOURCE_DIR ${sdp_app_dir}
+    SOURCE_DIR ${SB_CONFIG_SDP_IMAGE_PATH}
     BOARD ${board_target_flpr}
     BOARD_REVISION ${BOARD_REVISION}
   )
-  set(sdp_app_dir)
   set(board_target_flpr)
 endif()