build: px4: allow to embed defaults file into ROMFS

(cherry picked from commit f6d43aea25)

Tools/ardupilotwaf/boards.py

@@ -460,6 +460,12 @@ class px4(Board):
         # be searched for in sources and installed in ROMFS as rc.board. This
         # init script is used to change the init behavior among different boards.
         self.board_rc = False
+
+        # Path relative to the ROMFS directory where to find a file with default
+        # parameters. If set this file will be copied to /etc/defaults.parm
+        # inside the ROMFS
+        self.param_defaults = None
+
         self.ROMFS_EXCLUDE = []
 
     def configure(self, cfg):
@@ -504,6 +510,7 @@ class px4(Board):
         env.PX4_BOARD_NAME = self.board_name
         env.PX4_BOARD_RC = self.board_rc
         env.PX4_PX4IO_NAME = self.px4io_name
+        env.PX4_PARAM_DEFAULTS = self.param_defaults
 
         env.AP_PROGRAM_AS_STLIB = True
 

Tools/ardupilotwaf/px4.py

@@ -200,6 +200,9 @@ def _process_romfs(self):
         board_rc = 'init.d/rc.%s' % bld.env.get_flat('PX4_BOARD_NAME')
         file_list.append((board_rc, 'init.d/rc.board'))
 
+    if bld.env.PX4_PARAM_DEFAULTS:
+        file_list.append((bld.env.PX4_PARAM_DEFAULTS, 'defaults.parm'))
+
     romfs_src = bld.srcnode.find_dir(bld.env.PX4_ROMFS_SRC)
     romfs_bld = bld.bldnode.make_node(bld.env.PX4_ROMFS_BLD)