Don't require memory banks if not using an upload method

Author: multiplemonomials

tools/cmake/UploadMethodManager.cmake

@@ -43,8 +43,9 @@ if(NOT DEFINED MBED_UPLOAD_BASE_ADDR OR "${MBED_UPLOAD_BASE_ADDR}" STREQUAL "")
 	if(MBED_CONFIG_DEFINITIONS MATCHES "MBED_CONFIGURED_ROM_START=(0x[0-9a-zA-Z]+)")
 		set(MBED_UPLOAD_BASE_ADDR ${CMAKE_MATCH_1} CACHE STRING ${BASE_ADDR_DESCRIPTION})
 	else()
-		set(MBED_UPLOAD_BASE_ADDR "" CACHE STRING ${BASE_ADDR_DESCRIPTION})
-		message(FATAL_ERROR "Since no ROM banks have been defined, you need to set the MBED_UPLOAD_BASE_ADDR option so we know where to upload code.  NOTE: If you upgraded from an old version of Mbed CE and are getting this error, delete and reconfigure your CMake build directory.")
+		if(NOT ${UPLOAD_METHOD} STREQUAL "NONE")
+			message(FATAL_ERROR "Since no ROM banks have been defined, you need to set the MBED_UPLOAD_BASE_ADDR option so we know where to upload code.  NOTE: If you upgraded from an old version of Mbed CE and are getting this error, delete and reconfigure your CMake build directory.")
+		endif()
 	endif()
 endif()