rename all instances of serial PPB to EXT2

Tools/serial/generate_config.py

@@ -136,9 +136,9 @@ serial_ports = {
         "default_baudrate": 1, # set default to an unusable value to detect that this serial port has not been configured
         },
 
-    # Pixhawk Payload Bus
-    "PPB": {
-        "label": "Pixhawk Payload Bus",
+    # EXT2
+    "EXT2": {
+        "label": "EXT2",
         "index": 401,
         "default_baudrate": 57600,
         },

boards/px4/fmu-v5x/default.px4board

@@ -6,7 +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_PPB="/dev/ttyS3"
+CONFIG_BOARD_SERIAL_EXT2="/dev/ttyS3"
 CONFIG_DRIVERS_ADC_ADS1115=y
 CONFIG_DRIVERS_ADC_BOARD_ADC=y
 CONFIG_DRIVERS_BAROMETER_BMP388=y

boards/sky-drones/smartap-airlink/default.px4board

@@ -6,7 +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_PPB="/dev/ttyS3"
+CONFIG_BOARD_SERIAL_EXT2="/dev/ttyS3"
 CONFIG_DRIVERS_ADC_BOARD_ADC=y
 CONFIG_COMMON_BAROMETERS=y
 CONFIG_DRIVERS_BATT_SMBUS=y

cmake/kconfig.cmake

@@ -301,8 +301,8 @@ if(EXISTS ${BOARD_DEFCONFIG})
 	if(SERIAL_WIFI)
         list(APPEND board_serial_ports WIFI:${SERIAL_WIFI})
 	endif()
-	if(SERIAL_PPB)
-        list(APPEND board_serial_ports PPB:${SERIAL_PPB})
+	if(SERIAL_EXT2)
+        list(APPEND board_serial_ports EXT2:${SERIAL_EXT2})
 	endif()