code of blink led

[xiangfu]

Hi
I write some code. 
but i don't know how to download it to GTA02
and how to run it?
another question :
    where is the GTA02's LED? :-)
    what is the best TEXT_BASE value


::::::::::::::
led.c
::::::::::::::
extern void delay(int time);
#define GPBCON        (*(volatile unsigned *)0x56000010)
#define GPBDAT        (*(volatile unsigned *)0x56000014)
#define GPBUP        (*(volatile unsigned *)0x56000018)  
#define    LED3_ON()    (GPBDAT &= ~(0x1)) 
#define    LED4_ON()    (GPBDAT &= ~(0x2))  
#define    LED3_OFF()   (GPBDAT |= (0x1))
#define    LED4_OFF()   (GPBDAT |= (0x2))
void main()
{
    GPBCON = 0x5;
    GPBUP = 0xffff;
    while(1)
    {
    LED3_ON();
    delay(0xfffff);
    LED4_ON();
    delay(0xfffff);
    LED3_OFF() ;
    delay(0xfffff);
    LED4_OFF();
    delay(0xfffff);  
    }
}
::::::::::::::
led.s
::::::::::::::
.text
.global _start
    ldr sp,=1024*4
.extern main
    bl main
.global delay
delay:
    sub   r0,r0,#1
    cmp   r0,#0x0
    bne   delay
    mov   pc,lr
.end
   
::::::::::::::
Makefile
::::::::::::::
CROSS_COMPILE=arm-angstrom-linux-gnueabi-
TEXT_BASE=0x0000000
led_on: led.s led.c
    $(CROSS_COMPILE)gcc -g -c -o led.o led.s
    $(CROSS_COMPILE)gcc -g -c -o led_on.o led.c
    $(CROSS_COMPILE)ld -Ttext $(TEXT_BASE) -g led.o led_on.o  -o led_on_c.o
    $(CROSS_COMPILE)objcopy -O binary -S led_on_c.o led_on

clean:
    rm -f *.o
    rm -f led_on

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