6410 从sd卡启动，参照下面教程。
led_on.s:
.text
.global _start
_start:
     ldr r0, =0x7f008800    //GPK4-gpk7 output
     ldr r1, =0x11110000
     str r1, [r0]
     ldr r0, =0x7f008808    //gpkdat
     ldr r1, =0xf0            //10100000 低8位设置
     str r1, [r0]
main_loop:
    ldr    r1,=0xa0;
    str    r1,[r0]
    bl delay
    ldr    r1,=0x60;
    str    r1,[r0]
    bl delay
    b main_loop
delay:    
    ldr    r2,=0xffffff
delay1:
    sub    r2,r2,#1
    cmp    r2,#0x0
    bne    delay1
    mov    pc,r14
Makefil：
CROSS_COMPILE :=arm-linux -
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)ld
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
led_on.bin : led_on.S
        $(CC) -g -c -o led_on.o led_on.S
        $(LD) -Ttext 0x0000000 -g led_on.o -o led_on_elf
        $(OBJCOPY) -O binary -S led_on_elf led_on.bin
clean:
        rm -f led_on.bin led_on_elf *.o
编译后生成led_on.bin ，用winhex烧写到sd卡，sd插上。led一闪一闪。

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http://topic.csdn.net/u/20110710/14/28ce2621-9d78-4eb6-9ff1-a0bc74222103.html

    

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