diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekL431-EFI/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekL431-EFI/hwdef-bl.dat
new file mode 100644
index 0000000000..173d1fc2fc
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekL431-EFI/hwdef-bl.dat
@@ -0,0 +1,3 @@
+include ../MatekL431/hwdef-bl.inc
+
+define CAN_APP_NODE_NAME "org.ardupilot.MatekL431-EFI"
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekL431-EFI/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekL431-EFI/hwdef.dat
new file mode 100644
index 0000000000..2b122aa0c5
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekL431-EFI/hwdef.dat
@@ -0,0 +1,13 @@
+include ../MatekL431/hwdef.inc
+
+define CAN_APP_NODE_NAME "org.ardupilot.MatekL431-EFI"
+
+define HAL_USE_ADC FALSE
+define STM32_ADC_USE_ADC1 FALSE
+define HAL_DISABLE_ADC_DRIVER TRUE
+
+# support all serial EFI types
+define HAL_PERIPH_ENABLE_EFI
+define HAL_EFI_ENABLED 1
+
+define AP_PERIPH_EFI_PORT_DEFAULT 2