Plane: changed startup order

this allows BoardConfig to report errors in a way that allows for
BRD_TYPE to be changed by the user

ArduPlane/system.cpp

@@ -113,12 +113,18 @@ void Plane::init_ardupilot()
     }
 #endif
 
-    BoardConfig.init();
+    GCS_MAVLINK::set_dataflash(&DataFlash);
 
     // initialise serial ports
     serial_manager.init();
+    gcs[0].setup_uart(serial_manager, AP_SerialManager::SerialProtocol_MAVLink, 0);
 
-    GCS_MAVLINK::set_dataflash(&DataFlash);
+    // Register mavlink_delay_cb, which will run anytime you have
+    // more than 5ms remaining in your call to hal.scheduler->delay
+    hal.scheduler->register_delay_callback(mavlink_delay_cb_static, 5);
+
+    // setup any board specific drivers
+    BoardConfig.init();
 
     // allow servo set on all channels except first 4
     ServoRelayEvents.set_channel_mask(0xFFF0);
@@ -144,7 +150,7 @@ void Plane::init_ardupilot()
     check_usb_mux();
 
     // setup telem slots with serial ports
-    for (uint8_t i = 0; i < MAVLINK_COMM_NUM_BUFFERS; i++) {
+    for (uint8_t i = 1; i < MAVLINK_COMM_NUM_BUFFERS; i++) {
         gcs[i].setup_uart(serial_manager, AP_SerialManager::SerialProtocol_MAVLink, i);
     }
 
@@ -184,10 +190,6 @@ void Plane::init_ardupilot()
     }
 #endif
 
-    // Register mavlink_delay_cb, which will run anytime you have
-    // more than 5ms remaining in your call to hal.scheduler->delay
-    hal.scheduler->register_delay_callback(mavlink_delay_cb_static, 5);
-
     // give AHRS the airspeed sensor
     ahrs.set_airspeed(&airspeed);