diff --git a/hw/bsp/stm32h7/boards/stm32h743eval/board.h b/hw/bsp/stm32h7/boards/stm32h743eval/board.h
index cb6d772e6..7c3f6414a 100644
--- a/hw/bsp/stm32h7/boards/stm32h743eval/board.h
+++ b/hw/bsp/stm32h7/boards/stm32h743eval/board.h
@@ -249,7 +249,7 @@ static inline void board_init2(void) {
 }
 
 // VBUS1 is actually controlled by USB3320C PHY (using dwc2 drivebus signal)
-static void board_vbus_set(uint8_t rhport, bool state) {
+static void TU_ATTR_UNUSED board_vbus_set(uint8_t rhport, bool state) {
   if (mfx_io) {
     mfx_io->IO_WritePin(&mfx_obj, mfx_vbus_pin[rhport], state);
   }
diff --git a/hw/bsp/stm32h7/family.mk b/hw/bsp/stm32h7/family.mk
index 29b83cf7d..19a085424 100644
--- a/hw/bsp/stm32h7/family.mk
+++ b/hw/bsp/stm32h7/family.mk
@@ -45,11 +45,9 @@ CFLAGS += \
 	-DBOARD_TUH_MAX_SPEED=${RHPORT_HOST_SPEED} \
 
 # GCC Flags
-CFLAGS_GCC += \
-  -flto \
-
 # suppress warning caused by vendor mcu driver
 CFLAGS_GCC += \
+  -flto \
   -Wno-error=cast-align \
   -Wno-error=unused-parameter \
 
diff --git a/test/hil/hil_test.py b/test/hil/hil_test.py
index 14ab4e63a..f292bca15 100755
--- a/test/hil/hil_test.py
+++ b/test/hil/hil_test.py
@@ -543,7 +543,7 @@ def test_example(board, f1, example):
         print(f'Flashing {fw_name}.elf')
 
     # flash firmware. It may fail randomly, retry a few times
-    max_rety = 2
+    max_rety = 3
     for i in range(max_rety):
         ret = globals()[f'flash_{board["flasher"]["name"].lower()}'](board, fw_name)
         if ret.returncode == 0: