.text
.thumb

.global _start
_start:
	movs r0, #1
	lsl r0, #13
	ldr r1, RAM
	mov r2, #1
	lsl r2, #13
loop:
	ldr r3, [r0, r2]
	str r3, [r1, r2]
	sub r2, #4
	bne loop
end:
	b end

.align
RAM:	.word 0x20001000
GPIO_A: .word 0x400b0000