romfs: allow target level airframe selection (#25677)

ROMFS/CMakeLists.txt

@@ -85,10 +85,32 @@ endif()
 if(PX4_ETHERNET)
 	set(added_arguments ${added_arguments} --ethernet)
 endif()
+# Check if board has an rc.board_airframes file to filter airframes
+set(board_airframes_file "${PX4_BOARD_DIR}/init/rc.board_airframes")
+set(airframes_whitelist "")
+if(EXISTS "${board_airframes_file}")
+	message(STATUS "ROMFS: Using board-specific airframes list: ${board_airframes_file}")
+	file(STRINGS "${board_airframes_file}" airframes_whitelist)
+	# Remove comments and empty lines
+	list(FILTER airframes_whitelist EXCLUDE REGEX "^[ \t]*#")
+	list(FILTER airframes_whitelist EXCLUDE REGEX "^[ \t]*$")
+endif()
+
 # create list of relative romfs file names
 set(romfs_copy_files_relative)
 foreach(romfs_file IN LISTS romfs_copy_files)
 	string(REPLACE "${romfs_src_dir}/" "" romfs_file_rel ${romfs_file})
+
+	# If we have an airframes whitelist, filter airframe files
+	if(airframes_whitelist AND romfs_file_rel MATCHES "^init.d/airframes/")
+		# Extract just the filename
+		get_filename_component(airframe_name "${romfs_file_rel}" NAME)
+		# Check if it's in the whitelist
+		if(NOT "${airframe_name}" IN_LIST airframes_whitelist)
+			continue()
+		endif()
+	endif()
+
 	list(APPEND romfs_copy_files_relative ${romfs_file_rel})
 endforeach()
 # copy the ROMFS files by creating a tar and extracting it to the build

boards/ark/pi6x/init/rc.board_airframes

@@ -0,0 +1,2 @@
+4001_quad_x
+4601_droneblocks_dexi_5