re-add armStart.S and fix CMakeLists.txt

CMakeLists.txt

@@ -61,8 +61,18 @@ add_executable( ${TARGET_BUILD}
     ${rpiIncludes}
 )
 
+set_target_properties( ${TARGET_BUILD}
+    PROPERTIES
+    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
+)
+
+get_target_property(RUNTIME_OUTPUT_DIRECTORY ${TARGET_BUILD} RUNTIME_OUTPUT_DIRECTORY)
+
 add_custom_command(
     TARGET ${TARGET_BUILD} POST_BUILD
     COMMAND ${CMAKE_OBJCOPY} ${TARGET_BUILD} -O binary ${TARGET_OUTPUT}
-    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+    WORKING_DIRECTORY ${RUNTIME_OUTPUT_DIRECTORY}
     COMMENT "Convert the ELF output file to a binary image" )
+