diff --git a/libraries/AP_HAL_ChibiOS/hwdef/fmuv3/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/fmuv3/hwdef.dat
index 6a57cd02c9..ed0c1b08e2 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/fmuv3/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/fmuv3/hwdef.dat
@@ -170,3 +170,9 @@ define HAL_HAVE_IMU_HEATER 1
 
 # enable FAT filesystem
 define HAL_OS_FATFS_IO 1
+
+# enable RTSCTS
+define AP_FEATURE_RTSCTS 1
+
+# enable SBUS_OUT on IOMCU
+define AP_FEATURE_SBUS_OUT 1
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat
index c28d989d87..1a9be3f219 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/fmuv4/hwdef.dat
@@ -171,3 +171,5 @@ define HAL_GPIO_A_LED_PIN 0
 define HAL_GPIO_B_LED_PIN 1
 define HAL_GPIO_C_LED_PIN 2
 
+# enable RTSCTS
+define AP_FEATURE_RTSCTS 1
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/mindpx-v2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/mindpx-v2/hwdef.dat
index d64029bbbc..62bb839b72 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/mindpx-v2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/mindpx-v2/hwdef.dat
@@ -184,3 +184,5 @@ define STORAGE_FLASH_PAGE 22
 # enable FAT filesystem
 #define HAL_OS_FATFS_IO 1
 
+# enable RTSCTS
+define AP_FEATURE_RTSCTS 1