diff --git a/Kconfig b/Kconfig
index 2d53a79c05..5050e3e7d7 100644
--- a/Kconfig
+++ b/Kconfig
@@ -174,8 +174,8 @@ menu "Serial ports"
     config BOARD_SERIAL_WIFI
         string "WIFI tty port"
 
-    config BOARD_SERIAL_PPB
-        string "PPB (Pixhawk Payload Bus) tty port"
+    config BOARD_SERIAL_EXT2
+        string "EXT2 tty port"
 endmenu
 
 menu "drivers"
diff --git a/boards/px4/fmu-v5x/default.px4board b/boards/px4/fmu-v5x/default.px4board
index 18426d905c..0689cd2264 100644
--- a/boards/px4/fmu-v5x/default.px4board
+++ b/boards/px4/fmu-v5x/default.px4board
@@ -6,6 +6,7 @@ CONFIG_BOARD_SERIAL_GPS2="/dev/ttyS7"
 CONFIG_BOARD_SERIAL_TEL1="/dev/ttyS6"
 CONFIG_BOARD_SERIAL_TEL2="/dev/ttyS4"
 CONFIG_BOARD_SERIAL_TEL3="/dev/ttyS1"
+CONFIG_BOARD_SERIAL_EXT2="/dev/ttyS3"
 CONFIG_DRIVERS_ADC_ADS1115=y
 CONFIG_DRIVERS_ADC_BOARD_ADC=y
 CONFIG_DRIVERS_BAROMETER_BMP388=y
@@ -56,9 +57,9 @@ CONFIG_MODULES_ESC_BATTERY=y
 CONFIG_MODULES_EVENTS=y
 CONFIG_MODULES_FLIGHT_MODE_MANAGER=y
 CONFIG_MODULES_FW_ATT_CONTROL=y
-CONFIG_MODULES_FW_RATE_CONTROL=y
 CONFIG_MODULES_FW_AUTOTUNE_ATTITUDE_CONTROL=y
 CONFIG_MODULES_FW_POS_CONTROL_L1=y
+CONFIG_MODULES_FW_RATE_CONTROL=y
 CONFIG_MODULES_GIMBAL=y
 CONFIG_MODULES_GYRO_CALIBRATION=y
 CONFIG_MODULES_LAND_DETECTOR=y
@@ -80,7 +81,6 @@ CONFIG_MODULES_PAYLOAD_DELIVERER=y
 CONFIG_MODULES_RC_UPDATE=y
 CONFIG_MODULES_ROVER_POS_CONTROL=y
 CONFIG_MODULES_SENSORS=y
-CONFIG_MODULES_SIMULATION_PWM_OUT_SIM=y
 CONFIG_MODULES_SIMULATION_SIMULATOR_SIH=y
 CONFIG_MODULES_TEMPERATURE_COMPENSATION=y
 CONFIG_MODULES_VTOL_ATT_CONTROL=y