Add support for filesystem flashing with JLink

Author: maxgerhardt

builder/main.py

@@ -330,10 +330,11 @@ def _jlink_cmd_script(env, source):
         if not isdir(build_dir):
             makedirs(build_dir)
         script_path = join(build_dir, "upload.jlink")
+        upload_addr = hex(env["FS_START"]) if "uploadfs" in COMMAND_LINE_TARGETS else board.get(
+                "upload.offset_address", "0x0")
         commands = [
             "h",
-            "loadbin %s, %s" % (source, board.get(
-                "upload.offset_address", "0x0")),
+            "loadbin %s, %s" % (source, upload_addr),
             "r",
             "q"
         ]