Merge branch 'master' of github.com:PX4/Firmware into new_state_machine

src/drivers/boards/px4fmu/px4fmu_init.c

@@ -194,7 +194,7 @@ __EXPORT int nsh_archinitialize(void)
 	/* initial LED state */
 	drv_led_start();
 	led_off(LED_AMBER);
-	led_on(LED_BLUE);
+	led_off(LED_BLUE);
 
 
 	/* Configure SPI-based devices */

src/drivers/hmc5883/hmc5883.cpp

@@ -1221,7 +1221,8 @@ start()
 	int fd;
 
 	if (g_dev != nullptr)
-		errx(1, "already started");
+		/* if already started, the still command succeeded */
+		errx(0, "already started");
 
 	/* create the driver, attempt expansion bus first */
 	g_dev = new HMC5883(PX4_I2C_BUS_EXPANSION);

src/drivers/mpu6000/mpu6000.cpp

@@ -1063,7 +1063,8 @@ start()
 	int fd;
 
 	if (g_dev != nullptr)
-		errx(1, "already started");
+		/* if already started, the still command succeeded */
+		errx(0, "already started");
 
 	/* create the driver */
 	g_dev = new MPU6000(1 /* XXX magic number */, (spi_dev_e)PX4_SPIDEV_MPU);

src/drivers/ms5611/ms5611.cpp

@@ -969,7 +969,8 @@ start()
 	int fd;
 
 	if (g_dev != nullptr)
-		errx(1, "already started");
+		/* if already started, the still command succeeded */
+		errx(0, "already started");
 
 	/* create the driver */
 	g_dev = new MS5611(MS5611_BUS);