TQ2440国嵌学院gboot-代码的搬移

比较简单，就不逐个介绍了

copy_to_ram:
ldr r0, =0x0
ldr r1, =0x30008000
add r3, r0, #1024*4

copy_loop:
ldr r2, [r0], #4
str r2, [r1], #4
cmp r0, r3
bne copy_loop

mov pc, lr