Address           Data

0x00001f00     0x12

0x00001f01     0x34

0x00001f02     0x56

0x00001f03     0x78

Address:  0x00001f00      0x00001f01    0x00001f02    0x00001f03

Data :      0001 0010       0011 0100     0101 0110      0111 1000

Address          Data

0x00001f00     0x78

0x00001f01     0x56

0x00001f02     0x34

0x00001f03     0x12

Address:  0x00001f00      0x00001f01    0x00001f02    0x00001f03

Data :      0111 1000         0101 0110     0011 0100      0001 0010

union cpu_mode

         {

                   int a;  /*4 byte*/

                   char b; /*1 byte*/

                   char c; /*1 byte*/

                   char d; /*1 byte*/

                   char e; /*1 byte*/

         } pri_data;

         pri_data.a = 1;

         printk("pri_data.a = %d\n", pri_data.a);

         printk("pri_data.b = %d\n", pri_data.b);

         printk("pri_data.c = %d\n", pri_data.c);

         printk("pri_data.d = %d\n", pri_data.d);

         printk("pri_data.e = %d\n", pri_data.e);

         if (1 == pri_data.b == pri_data.c == pri_data.d == pri_data.e) {

                   printk("小端存储模式\n");

         } else {

                   printk("大端存储模式\n");

         }

         unsigned short pri_data=0xaabb;

         char data1,data2;

         data1 = *((char*)&pri_data); //低地址单元上的数据

         data2 = *((char*)&pri_data + 1); //高地址单元上的数据

         printk("data1 = 0x%02x\n", data1);

         printk("data2 = 0x%02x\n", data2);

         if (data1 == 0xbb && data2 == 0xaa) {

                   printk("小端存储模式\n");

         } else if (data1 == 0xaa && data2 == 0xbb) {

                   printk("大端存储模式\n");

         } else {

                   printk("未知存储模式\n");

         }