Simple LED blinking code

Hello Friends,

I did an LED blinking code for the LPC2468 Development Board(OLIMEX), built it in CrossStudio for ARM IDE downloaded it to the board and blinked the LED. 

But when I do it on an LPC2478-based  custom-designed board it didnt blink LED.

The only difference between LPC2468 and LPC2478 mcu is the display functionality.

C code- 

#include <targets/LPC2000.h>

#define LED (1 << 20)

static void delay(volatile int n) {
  while (n--);
}

int main(void) {
  SCS |= SCS_GPIOM;
  FIO1DIR |= LED;
  while (1) {
    FIO1PIN ^= LED;
    delay(1000000);
  }
}