diff --git a/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat
index 1431d0326e..52478ec7e6 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat
@@ -147,3 +147,14 @@ ROMFS_WILDCARD libraries/AP_OSD/fonts/font*.bin
 
 define BOARD_PWM_COUNT_DEFAULT 6
 define STM32_PWM_USE_ADVANCED TRUE
+
+# disable SMBUS and fuel battery monitors to save flash
+define HAL_BATTMON_SMBUS_ENABLE 0
+define HAL_BATTMON_FUEL_ENABLE 0
+
+# disable parachute and sprayer to save flash
+define HAL_PARACHUTE_ENABLED 0
+define HAL_SPRAYER_ENABLED 0
+
+# reduce max size of embedded params for apj_tool.py
+define AP_PARAM_MAX_EMBEDDED_PARAM 1024
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
index 6dace8092a..2ae20160a6 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
@@ -125,6 +125,14 @@ define HAL_PROBE_EXTERNAL_I2C_COMPASSES
 define HAL_I2C_INTERNAL_MASK 0
 define HAL_COMPASS_AUTO_ROT_DEFAULT 2
 
+# disable SMBUS and fuel battery monitors to save flash
+define HAL_BATTMON_SMBUS_ENABLE 0
+define HAL_BATTMON_FUEL_ENABLE 0
+
+# disable parachute and sprayer to save flash
+define HAL_PARACHUTE_ENABLED 0
+define HAL_SPRAYER_ENABLED 0
+
 # one baro
 BARO BMP280 SPI:bmp280