diff --git a/board.h b/board.h
index 5e33526..522e9fb 100644
--- a/board.h
+++ b/board.h
@@ -6,4 +6,8 @@
  */
 #define BOARD_NAME "AT-EVAL"
 
+#ifndef LED_CRITICAL_ERROR_BRAIN_PIN
+#define LED_CRITICAL_ERROR_BRAIN_PIN Gpio::Unassigned
+#endif
+
 #endif /* _BOARD_H_ */
diff --git a/config.mk b/config.mk
index 5279d4a..2944820 100644
--- a/config.mk
+++ b/config.mk
@@ -2,3 +2,5 @@ ARTERY_CONTRIB = $(BOARD_DIR)/OS
 
 USE_LIS302 = no
 USE_FATFS = no
+
+LDSCRIPT = $(ARTERY_CONTRIB)/../ext/AT32F435_437_Firmware_Library/libraries/cmsis/cm4/device_support/startup/gcc/linker/AT32F435xG_FLASH.ld
\ No newline at end of file
diff --git a/efifeatures.h b/efifeatures.h
index e69de29..6d0b97b 100644
--- a/efifeatures.h
+++ b/efifeatures.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#define EFI_GPIO_HARDWARE TRUE
+
+// todo: we really need GPT implementation
+// todo: #define EFI_SIGNAL_EXECUTOR_ONE_TIMER TRUE
+#define EFI_SIGNAL_EXECUTOR_SLEEP TRUE
+#define MY_US2ST(x) ((x) / 10)
+
+#define CONSOLE_MAX_ACTIONS 180
+
+#define ENABLE_PERF_TRACE FALSE
\ No newline at end of file