diff --git a/os/hal/boards/SN_SN32F240/board.c b/os/hal/boards/SN_SN32F240/board.c
index dfc276c2..655a9b04 100644
--- a/os/hal/boards/SN_SN32F240/board.c
+++ b/os/hal/boards/SN_SN32F240/board.c
@@ -44,6 +44,7 @@ const PALConfig pal_default_config = {
 #endif
 
 static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0xAAAA5555;
+extern void enter_bootloader_mode_if_requested(void);
 
 /**
  * @brief   Early initialization code.
@@ -51,6 +52,7 @@ static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0x
  *          and before any other initialization.
  */
 void __early_init(void) {
+  enter_bootloader_mode_if_requested();
   sn32_clock_init();
 }
 
diff --git a/os/hal/boards/SN_SN32F240B/board.c b/os/hal/boards/SN_SN32F240B/board.c
index dfc276c2..655a9b04 100644
--- a/os/hal/boards/SN_SN32F240B/board.c
+++ b/os/hal/boards/SN_SN32F240B/board.c
@@ -44,6 +44,7 @@ const PALConfig pal_default_config = {
 #endif
 
 static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0xAAAA5555;
+extern void enter_bootloader_mode_if_requested(void);
 
 /**
  * @brief   Early initialization code.
@@ -51,6 +52,7 @@ static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0x
  *          and before any other initialization.
  */
 void __early_init(void) {
+  enter_bootloader_mode_if_requested();
   sn32_clock_init();
 }
 
diff --git a/os/hal/boards/SN_SN32F280/board.c b/os/hal/boards/SN_SN32F280/board.c
index dfc276c2..655a9b04 100644
--- a/os/hal/boards/SN_SN32F280/board.c
+++ b/os/hal/boards/SN_SN32F280/board.c
@@ -44,6 +44,7 @@ const PALConfig pal_default_config = {
 #endif
 
 static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0xAAAA5555;
+extern void enter_bootloader_mode_if_requested(void);
 
 /**
  * @brief   Early initialization code.
@@ -51,6 +52,7 @@ static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0x
  *          and before any other initialization.
  */
 void __early_init(void) {
+  enter_bootloader_mode_if_requested();
   sn32_clock_init();
 }
 
diff --git a/os/hal/boards/SN_SN32F290/board.c b/os/hal/boards/SN_SN32F290/board.c
index dfc276c2..655a9b04 100644
--- a/os/hal/boards/SN_SN32F290/board.c
+++ b/os/hal/boards/SN_SN32F290/board.c
@@ -44,6 +44,7 @@ const PALConfig pal_default_config = {
 #endif
 
 static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0xAAAA5555;
+extern void enter_bootloader_mode_if_requested(void);
 
 /**
  * @brief   Early initialization code.
@@ -51,6 +52,7 @@ static int flag __attribute__((section(".flag"))) __attribute__((__used__)) = 0x
  *          and before any other initialization.
  */
 void __early_init(void) {
+  enter_bootloader_mode_if_requested();
   sn32_clock_init();
 }