arm 外设端口映射

/* 硬件相关的设置 */
    /* Peri port setup

cpu: 外设 | 内存

cpu芯片手册上的外设是0x7000_0000 开始

所有这里告诉cpu ？

我可以骗 cpu 说是0x6000_0000 ?

*/
    ldr r0, =0x70000000         @外设端口的地址 peripheral port memory remap register
    orr r0, r0, #0x13           @r0=0x70000013
                                @ [31:12] base address: gives the physical base address of the region of memory

　　　　　　　　　　  @ for remapping the peripheral port.
                                @ [11:5] UNP/SBZ
                                @ [4:0] size: indicates the size of the memory region that the peripheral port is remapped to
                                @ b10011 256M
    mcr p15,0,r0,c15,c2,4       @ 256M(0x70000000-0x7fffffff)

需理解

电灯： 看原理图