Add warning for using stub with >16MB flash size

esptool.py

@@ -4588,6 +4588,13 @@ def add_spi_flash_subparsers(parent, allow_keep, auto_detect):
             detect_flash_size(esp, args)
             if args.flash_size != 'keep':  # TODO: should set this even with 'keep'
                 esp.flash_set_parameters(flash_size_bytes(args.flash_size))
+                # Check if stub supports chosen flash size
+                if esp.IS_STUB and args.flash_size in ('32MB', '64MB', '128MB'):
+                    print("WARNING: Flasher stub doesn't fully support flash size larger than 16MB, in case of failure use --no-stub.")
+
+        if esp.IS_STUB and hasattr(args, "address") and hasattr(args, "size"):
+            if args.address + args.size > 0x1000000:
+                print("WARNING: Flasher stub doesn't fully support flash size larger than 16MB, in case of failure use --no-stub.")
 
         try:
             operation_func(esp, args)