[bsp][renesas] add IAR enviroment entry function and startup_check script

Author: tomjielii

bsp/renesas/ra2e2-ek/SConstruct

@@ -44,6 +44,18 @@ Export('SDK_LIB')
 
 rtconfig.BSP_LIBRARY_TYPE = None
 
+def startup_check():
+    import subprocess
+    startup_check_path = os.getcwd() + "/../tools/startup_check.py"
+
+    if os.path.exists(startup_check_path):
+        try:
+            subprocess.call(["python", startup_check_path])
+        except:
+            subprocess.call(["python3", startup_check_path])
+
+RegisterPreBuildingAction(startup_check)
+
 # prepare building environment
 objs = PrepareBuilding(env, RTT_ROOT, has_libcpu=False)
 

bsp/renesas/ra2e2-ek/ra/fsp/src/bsp/cmsis/Device/RENESAS/Source/startup.c

@@ -50,11 +50,15 @@ void Reset_Handler (void)
     SystemInit();
 
     /* Call user application. */
-#ifdef __ARMCC_VERSION
-    main();
-#elif defined(__GNUC__)
+#if defined(__GNUC__) && !defined(__ARMCC_VERSION)
     extern int entry(void);
     entry();
+#elif defined(__ICCARM__)
+    extern void __low_level_init(void);
+    __low_level_init();
+#else
+    /* Jump to main. */
+    main();
 #endif
 
     while (1)