diff --git a/libraries/AP_EFI/AP_EFI.cpp b/libraries/AP_EFI/AP_EFI.cpp
index 5fd3f8a590..cd796a82e3 100644
--- a/libraries/AP_EFI/AP_EFI.cpp
+++ b/libraries/AP_EFI/AP_EFI.cpp
@@ -94,17 +94,17 @@ void AP_EFI::init(void)
         backend = new AP_EFI_Serial_Lutan(*this);
         break;
     case Type::NWPMU:
-#if HAL_EFI_NWPWU_ENABLED
+#if AP_EFI_NWPWU_ENABLED
         backend = new AP_EFI_NWPMU(*this);
 #endif
         break;
     case Type::DroneCAN:
-#if HAL_EFI_DRONECAN_ENABLED
+#if AP_EFI_DRONECAN_ENABLED
         backend = new AP_EFI_DroneCAN(*this);
 #endif
         break;
     case Type::CurrawongECU:
-#if HAL_EFI_CURRAWONG_ECU_ENABLED
+#if AP_EFI_CURRAWONG_ECU_ENABLED
         backend = new AP_EFI_Currawong_ECU(*this);
 #endif
         break;
diff --git a/libraries/AP_EFI/AP_EFI_Currawong_ECU.cpp b/libraries/AP_EFI/AP_EFI_Currawong_ECU.cpp
index 091537807c..9aa69e78a7 100644
--- a/libraries/AP_EFI/AP_EFI_Currawong_ECU.cpp
+++ b/libraries/AP_EFI/AP_EFI_Currawong_ECU.cpp
@@ -21,7 +21,7 @@
 
 #include "AP_EFI_Currawong_ECU.h"
 
-#if HAL_EFI_CURRAWONG_ECU_ENABLED
+#if AP_EFI_CURRAWONG_ECU_ENABLED
 
 #include <AP_Param/AP_Param.h>
 #include <AP_PiccoloCAN/piccolo_protocol/ECUPackets.h>
@@ -103,4 +103,4 @@ bool AP_EFI_Currawong_ECU::handle_message(AP_HAL::CANFrame &frame)
     return valid;
 }
 
-#endif // HAL_EFI_CURRAWONG_ECU_ENABLED
+#endif // AP_EFI_CURRAWONG_ECU_ENABLED
diff --git a/libraries/AP_EFI/AP_EFI_Currawong_ECU.h b/libraries/AP_EFI/AP_EFI_Currawong_ECU.h
index 89387e9dd4..300a5db64f 100644
--- a/libraries/AP_EFI/AP_EFI_Currawong_ECU.h
+++ b/libraries/AP_EFI/AP_EFI_Currawong_ECU.h
@@ -21,15 +21,13 @@
  
 #pragma once
 
+#include "AP_EFI_config.h"
+
+#if AP_EFI_CURRAWONG_ECU_ENABLED
+
 #include "AP_EFI.h"
 #include "AP_EFI_Backend.h"
 
-#ifndef HAL_EFI_CURRAWONG_ECU_ENABLED
-#define HAL_EFI_CURRAWONG_ECU_ENABLED HAL_MAX_CAN_PROTOCOL_DRIVERS && (BOARD_FLASH_SIZE > 1024)
-#endif
-
-#if HAL_EFI_CURRAWONG_ECU_ENABLED
-
 class AP_EFI_Currawong_ECU : public AP_EFI_Backend {
 public:
     AP_EFI_Currawong_ECU(AP_EFI &_frontend);
@@ -49,5 +47,5 @@ private:
     friend class AP_PiccoloCAN;
 };
 
-#endif // HAL_EFI_CURRAWONG_ECU_ENABLED
+#endif // AP_EFI_CURRAWONG_ECU_ENABLED
 
diff --git a/libraries/AP_EFI/AP_EFI_DroneCAN.cpp b/libraries/AP_EFI/AP_EFI_DroneCAN.cpp
index 50388c1508..0df6d05484 100644
--- a/libraries/AP_EFI/AP_EFI_DroneCAN.cpp
+++ b/libraries/AP_EFI/AP_EFI_DroneCAN.cpp
@@ -2,7 +2,7 @@
 
 #include "AP_EFI_DroneCAN.h"
 
-#if HAL_EFI_DRONECAN_ENABLED
+#if AP_EFI_DRONECAN_ENABLED
 
 #include <AP_CANManager/AP_CANManager.h>
 #include <AP_UAVCAN/AP_UAVCAN.h>
@@ -165,5 +165,5 @@ void AP_EFI_DroneCAN::handle_status(const uavcan::equipment::ice::reciprocating:
     copy_to_frontend();
 }
 
-#endif // HAL_EFI_DRONECAN_ENABLED
+#endif // AP_EFI_DRONECAN_ENABLED
 
diff --git a/libraries/AP_EFI/AP_EFI_DroneCAN.h b/libraries/AP_EFI/AP_EFI_DroneCAN.h
index d1ec432ccc..b84e4be1b0 100644
--- a/libraries/AP_EFI/AP_EFI_DroneCAN.h
+++ b/libraries/AP_EFI/AP_EFI_DroneCAN.h
@@ -3,7 +3,7 @@
 #include "AP_EFI.h"
 #include "AP_EFI_Backend.h"
 
-#if HAL_EFI_DRONECAN_ENABLED
+#if AP_EFI_DRONECAN_ENABLED
 #include <AP_UAVCAN/AP_UAVCAN.h>
 #include <uavcan/equipment/ice/reciprocating/Status.hpp>
 
@@ -24,5 +24,5 @@ private:
     // singleton for trampoline
     static AP_EFI_DroneCAN *driver;
 };
-#endif // HAL_EFI_DRONECAN_ENABLED
+#endif // AP_EFI_DRONECAN_ENABLED
 
diff --git a/libraries/AP_EFI/AP_EFI_NWPMU.cpp b/libraries/AP_EFI/AP_EFI_NWPMU.cpp
index 44c8c947ec..9fd732ee15 100644
--- a/libraries/AP_EFI/AP_EFI_NWPMU.cpp
+++ b/libraries/AP_EFI/AP_EFI_NWPMU.cpp
@@ -13,6 +13,10 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "AP_EFI_config.h"
+
+#if AP_EFI_NWPWU_ENABLED
+
 #include <AP_HAL/AP_HAL.h>
 
 #include <AP_Common/AP_Common.h>
@@ -22,8 +26,6 @@
 
 #include "AP_EFI_NWPMU.h"
 
-#if HAL_EFI_NWPWU_ENABLED
-
 extern const AP_HAL::HAL& hal;
 
 AP_EFI_NWPMU::AP_EFI_NWPMU(AP_EFI &_frontend) :
@@ -131,4 +133,4 @@ void AP_EFI_NWPMU::update()
     copy_to_frontend();
 }
 
-#endif // HAL_EFI_NWPWU_ENABLED
+#endif // AP_EFI_NWPWU_ENABLED
diff --git a/libraries/AP_EFI/AP_EFI_NWPMU.h b/libraries/AP_EFI/AP_EFI_NWPMU.h
index ce3677ccf9..8f4280e174 100644
--- a/libraries/AP_EFI/AP_EFI_NWPMU.h
+++ b/libraries/AP_EFI/AP_EFI_NWPMU.h
@@ -20,15 +20,12 @@
  
 #pragma once
 
+#include "AP_EFI_config.h"
+
+#if AP_EFI_NWPWU_ENABLED
+
 #include "AP_EFI.h"
 #include "AP_EFI_Backend.h"
-#include <AP_CANManager/AP_CANSensor.h>
-
-#ifndef HAL_EFI_NWPWU_ENABLED
-#define HAL_EFI_NWPWU_ENABLED HAL_MAX_CAN_PROTOCOL_DRIVERS && BOARD_FLASH_SIZE > 1024
-#endif
-
-#if HAL_EFI_NWPWU_ENABLED
 
 class AP_EFI_NWPMU : public CANSensor, public AP_EFI_Backend {
 public:
@@ -111,5 +108,5 @@ private:
     };
 };
 
-#endif // HAL_EFI_NWPWU_ENABLED
+#endif // AP_EFI_NWPWU_ENABLED
 
diff --git a/libraries/AP_EFI/AP_EFI_config.h b/libraries/AP_EFI/AP_EFI_config.h
index c85584373a..d54e71c5eb 100644
--- a/libraries/AP_EFI/AP_EFI_config.h
+++ b/libraries/AP_EFI/AP_EFI_config.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <AP_HAL/AP_HAL_Boards.h>
+#include <AP_CANManager/AP_CANSensor.h>
 
 #ifndef HAL_EFI_ENABLED
 #define HAL_EFI_ENABLED !HAL_MINIMIZE_FEATURES && BOARD_FLASH_SIZE > 1024
@@ -10,8 +11,16 @@
 #define AP_EFI_BACKEND_DEFAULT_ENABLED HAL_EFI_ENABLED
 #endif
 
-#ifndef HAL_EFI_DRONECAN_ENABLED
-#define HAL_EFI_DRONECAN_ENABLED AP_EFI_BACKEND_DEFAULT_ENABLED && HAL_MAX_CAN_PROTOCOL_DRIVERS && BOARD_FLASH_SIZE > 1024 && HAL_CANMANAGER_ENABLED
+#ifndef AP_EFI_CURRAWONG_ECU_ENABLED
+#define AP_EFI_CURRAWONG_ECU_ENABLED AP_EFI_BACKEND_DEFAULT_ENABLED && HAL_MAX_CAN_PROTOCOL_DRIVERS
+#endif
+
+#ifndef AP_EFI_DRONECAN_ENABLED
+#define AP_EFI_DRONECAN_ENABLED AP_EFI_BACKEND_DEFAULT_ENABLED && HAL_MAX_CAN_PROTOCOL_DRIVERS && HAL_CANMANAGER_ENABLED
+#endif
+
+#ifndef AP_EFI_NWPWU_ENABLED
+#define AP_EFI_NWPWU_ENABLED AP_EFI_BACKEND_DEFAULT_ENABLED && HAL_MAX_CAN_PROTOCOL_DRIVERS
 #endif
 
 #ifndef AP_EFI_SCRIPTING_ENABLED