diff --git a/cores/arduino/board.h b/cores/arduino/board.h
index d62102f..ac36c47 100644
--- a/cores/arduino/board.h
+++ b/cores/arduino/board.h
@@ -8,9 +8,4 @@ extern volatile bool use_error_messages;
 // function for init called after setup()
 void post_init(void);
 
-void updateCacheLimit(void);
-#include "stdint.h"
-uint32_t getCLimit(void);
-
-
 #endif /* _BOARD_H_ */
diff --git a/cores/arduino/main.cpp b/cores/arduino/main.cpp
index f4fb6a9..0fcf31d 100644
--- a/cores/arduino/main.cpp
+++ b/cores/arduino/main.cpp
@@ -7,16 +7,9 @@
 void initVariant() __attribute__((weak));
 void initVariant() { }
 
-#include "xprintf.h"
-
 extern "C" int main(void) __attribute__((weak));
 int main()
 {
-    Serial.begin(9600);
-    xprintf("old_climit = 0x%08lX\n", getCLimit());
-    updateCacheLimit();
-    xprintf("new_climit = 0x%08lX\n", getCLimit());
-
     initVariant(); // for freeRTOS
     setup();
     post_init();