diff --git a/os/common/startup/ARMCMx/compilers/GCC/crt0_v6m.S b/os/common/startup/ARMCMx/compilers/GCC/crt0_v6m.S
index 42bf683f32..4b83d08814 100644
--- a/os/common/startup/ARMCMx/compilers/GCC/crt0_v6m.S
+++ b/os/common/startup/ARMCMx/compilers/GCC/crt0_v6m.S
@@ -163,6 +163,9 @@
                 .thumb_func
                 .global _crt0_entry
 _crt0_entry:
+                ldr     R0, =__entry_hook
+                blx     R0
+
                 /* Interrupts are globally masked initially.*/
                 cpsid   i
 
diff --git a/os/common/startup/ARMCMx/compilers/GCC/crt0_v7m.S b/os/common/startup/ARMCMx/compilers/GCC/crt0_v7m.S
index 4abe00a999..860b59272a 100644
--- a/os/common/startup/ARMCMx/compilers/GCC/crt0_v7m.S
+++ b/os/common/startup/ARMCMx/compilers/GCC/crt0_v7m.S
@@ -201,6 +201,9 @@
                 .thumb_func
                 .global _crt0_entry
 _crt0_entry:
+                ldr     R0, =__entry_hook
+                blx     R0
+
                 /* Interrupts are globally masked initially.*/
                 cpsid   i
 
diff --git a/os/common/startup/ARMCMx/compilers/GCC/crt1.c b/os/common/startup/ARMCMx/compilers/GCC/crt1.c
index ae15b3216e..9a2d03e168 100644
--- a/os/common/startup/ARMCMx/compilers/GCC/crt1.c
+++ b/os/common/startup/ARMCMx/compilers/GCC/crt1.c
@@ -147,6 +147,20 @@ void __cpu_init(void) {
 }
 
 /**
+ * @brief called immediately at Reset
+ * @details This hook is invoked immediately after the Reset Handler
+ * 
+ * @note    This function is a weak symbol.
+ */
+#if !defined(__DOXYGEN__)
+__attribute__((weak))
+#endif
+/*lint -save -e9075 [8.4] All symbols are invoked from asm context.*/
+#ifndef __ARDUPILOT__
+void __entry_hook(void) {}
+#endif
+
+/**
  * @brief   Early initialization.
  * @details This hook is invoked immediately after the stack and core
  *          initialization and before the DATA and BSS segments