ubx: add option to wipe flash

src/drivers/gps/gps.cpp

@@ -909,6 +909,15 @@ GPS::run()
 
 		gpsConfig.interface_protocols = static_cast<GPSHelper::InterfaceProtocolsMask>(gps_ubx_cfg_intf);
 
+		int32_t gps_cfg_wipe = 0;
+		handle = param_find("GPS_CFG_WIPE");
+
+		if (handle != PARAM_INVALID) {
+			param_get(handle, &gps_cfg_wipe);
+		}
+
+		gpsConfig.cfg_wipe = static_cast<bool>(gps_cfg_wipe);
+
 		if (_helper && _helper->configure(_baudrate, gpsConfig) == 0) {
 
 			/* reset report */

src/drivers/gps/params.c

@@ -142,6 +142,22 @@ PARAM_DEFINE_INT32(GPS_UBX_BAUD2, 230400);
  */
 PARAM_DEFINE_INT32(GPS_UBX_CFG_INTF, 0);
 
+/**
+ * Wipes the flash config of UBX modules.
+ *
+ * Some UBX modules have a FLASH that allows to store persistent configuration that will be loaded on start.
+ * PX4 does override all configuration parameters it needs in RAM, which takes precedence over the values in FLASH.
+ * However, configuration parameters that are not overriden by PX4 can still cause unexpected problems during flight.
+ * To avoid these kind of problems a clean config can be reached by wiping the FLASH on boot.
+ *
+ * Note: Currently only supported on UBX.
+ *
+ * @reboot_required true
+ * @group GPS
+ * @boolean
+ */
+PARAM_DEFINE_INT32(GPS_CFG_WIPE, 0);
+
 /**
  * Heading/Yaw offset for dual antenna GPS
  *