diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-bdshot/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-bdshot/hwdef.dat
index 67ea0aae84..3aca8a528d 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-bdshot/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-bdshot/hwdef.dat
@@ -36,3 +36,7 @@ define HAL_PROBE_EXTERNAL_I2C_COMPASSES
 # produce this error if we are on a 1M board
 undef BOARD_CHECK_F427_USE_1M
 define BOARD_CHECK_F427_USE_1M "ERROR: 1M flash use Pixhawk1-1M"
+
+# enable support for dshot on iomcu
+ROMFS io_firmware_dshot.bin Tools/IO_Firmware/iofirmware_dshot_lowpolh.bin
+define HAL_WITH_IO_MCU_DSHOT 1
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
index 26d14b1905..05ef592380 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
@@ -3040,6 +3040,8 @@ Please run: Tools/scripts/build_bootloaders.py %s
                     self.baro_list = []
                 if u == 'AIRSPEED':
                     self.airspeed_list = []
+                if u == 'ROMFS':
+                    self.romfs = {}
         elif a[0] == 'env':
             self.progress("Adding environment %s" % ' '.join(a[1:]))
             if len(a[1:]) < 2: