Tools: embed default.param files for Linux boards

Tools/ardupilotwaf/boards.py

@@ -1000,6 +1000,15 @@ class linux(Board):
         if cfg.options.apstatedir:
             cfg.define('AP_STATEDIR', cfg.options.apstatedir)
 
+        defaults_file = 'libraries/AP_HAL_Linux/boards/%s/defaults.parm' % self.get_name()
+        if os.path.exists(defaults_file):
+            env.ROMFS_FILES += [('defaults.parm', defaults_file)]
+            env.DEFINES.update(
+                HAL_PARAM_DEFAULTS_PATH='"@ROMFS/defaults.parm"',
+            )
+        if len(env.ROMFS_FILES) > 0:
+            env.CXXFLAGS += ['-DHAL_HAVE_AP_ROMFS_EMBEDDED_H']
+
     def build(self, bld):
         super(linux, self).build(bld)
         if bld.options.upload: