arm+c程序 为什么加const编译出来的BIN就变得小N多。解决方法

.text.global _start_start:    ldr sp, =4096    bl  close_watchdog    bl memsetup    bl  testarmled:    ldr r0, =0x56000010    mov r1, #0x15400    str r1, [r0]    ldr r0, =0x56000014    mov r1, #0    str r1, [r0]loop:    b   loop

all: clean    arm-linux-gcc -c  myhead.s myinit.c    arm-linux-ld -Ttext 0x00000000 myhead.o myinit.o -o test.elf    arm-linux-objcopy -O binary -S test.elf test.bin    arm-linux-objdump -D -m arm test.elf > test.dis    -rm -f *.o *.elfclean:    -rm -f *.bin~                                                                            ~                      

typedef    volatile unsigned int PLONG32;struct mini2440 {    PLONG32    NFCONF;     //4E000000    PLONG32    NFCONT;        //04    PLONG32    NFCMMD;        //08    PLONG32    NFADDR;        //0c    PLONG32    NFDATA;        //10    PLONG32    NFMECCD0;    //14    PLONG32    NFMECCD1;    //18    PLONG32    NFSECCD;    //1c    PLONG32    NFSTAT;        //20    PLONG32    NFESTAT0;    //24    PLONG32    NFESTAT1;    //28    PLONG32    NFMECC0;    //2c    PLONG32    NFMECC1;    //30    PLONG32    NFSECC;        //34    PLONG32    NFSBLK;        //38    PLONG32    NFEBLK;        //3c};void close_watchdog();void memsetup();void led();void test();struct mini2440 * addr = (struct mini2440 *)0x4e000000;  //这样编译出来的BIN 为32K//如果改为 struct mini2440 *const addr = (struct mini2440 *const)0x4e000000; 编译出来的BIN 为328字节//  WHY？void close_watchdog(){#define rWTCON (*((volatile unsigned long *)0x53000000))    rWTCON = 0;}void memsetup(){    int     i = 0;    unsigned long *p = (unsigned long *)0x48000000;    /* SDRAM 13个寄存器的值*/     unsigned long  const    mem_cfg_val[]={ 0x22011110,     //BWSCON                                            0x00000700,     //BANKCON0                                            0x00000700,     //BANKCON1                                            0x00000700,     //BANKCON2                                            0x00000700,     //BANKCON3                                              0x00000700,     //BANKCON4                                            0x00000700,     //BANKCON5                                            0x00018005,     //BANKCON6                                            0x00018005,     //BANKCON7                                            0x008C07A3,     //REFRESH                                            0x000000B1,     //BANKSIZE                                            0x00000030,     //MRSRB6                                            0x00000030,     //MRSRB7                                    };    for(; i < 13; i++)        p[i] = mem_cfg_val[i];}void led(){#define rGPBCON    (*(volatile unsigned long *)0x56000010)#define rGPBDAT    (*(volatile unsigned long *)0x56000014)    rGPBCON = 0x15400;    rGPBDAT = 0;    while (1);}void test(){    if(addr == (struct mini2440 *)0x4e000000)        led();        while (1);}