diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef-bl.dat
index c9b65a069f..e048f428f4 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef-bl.dat
@@ -15,8 +15,8 @@ APJ_BOARD_ID 1064
 # setup build for a peripheral firmware
 env AP_PERIPH 1
 
-# crystal frequency set to 0 to use internal clock
-OSCILLATOR_HZ 0
+# crystal frequency set to 0 to use internal clock; currently configured for external crystal 12MHZ
+OSCILLATOR_HZ 12000000
 
 # assume 1024K flash part
 FLASH_SIZE_KB 1024
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat
index ce9333e202..26a794ca83 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixF405/hwdef.dat
@@ -16,8 +16,10 @@ APJ_BOARD_ID 1064
 # setup build for a peripheral firmware
 env AP_PERIPH 1
 
-# crystal frequency set to 0 to use internal clock
-OSCILLATOR_HZ 0
+# crystal frequency set to 0 to use internal clock; currently configured for external crystal 12MHZ
+OSCILLATOR_HZ 12000000
+
+define AP_CUSTOM_FIRMWARE_STRING "CarboPilot V5.0.1-dev"
 
 #MCU F405 Flash 1024
 FLASH_SIZE_KB 1024
@@ -115,33 +117,9 @@ define HAL_NO_MONITOR_THREAD
 
 define AP_PARAM_MAX_EMBEDDED_PARAM 512
 
-define CAN_APP_NODE_NAME "org.ardupilot.CarbonixF405"
-
-define HAL_PERIPH_ENABLE_MAG
-define HAL_PERIPH_ENABLE_BARO
 define HAL_PERIPH_ENABLE_RC_OUT
 
 # enable ESC control
 define HAL_SUPPORT_RCOUT_SERIAL 1
-define HAL_WITH_ESC_TELEM 1
-
-# enable GPS
-define HAL_PERIPH_ENABLE_GPS
-define HAL_PERIPH_GPS_PORT_DEFAULT 2
-#define HAL_PERIPH_ENABLE_NOTIFY
-#define HAL_PERIPH_ENABLE_NCP5623_LED_WITHOUT_NOTIFY
-
-# default ADSB off by setting 0 baudrate
-define HAL_PERIPH_ENABLE_ADSB
-define HAL_PERIPH_ADSB_PORT_DEFAULT 3
-define HAL_PERIPH_ADSB_BAUD_DEFAULT 57600
-
-BARO MS56XX I2C:0:0x76
-COMPASS MMC5XX3 I2C:0:0x30 false ROTATION_NONE
-
-define AP_COMPASS_QMC5883P_ENABLED 1
-COMPASS QMC5883P I2C:0:0x2C false ROTATION_YAW_180
-
-
-
 
+define HAL_PERIPH_ARM_MONITORING_ENABLE 1
\ No newline at end of file