首先

内核配置需要打开MTD选项

Memory Technology Devices (MTD)  --->

如果是NOR Flash，需要选择Common Flash Interface (CFI)相关的选项；而且需要配置映射首地址（和uboot中配置的flash首地址一致）、映射地址大小和位宽

<*> CFI Flash device in physical memory map

(0xff800000) Physical start address of flash mapping

(0x2000000) Physical length of flash mapping

(2)   Bank width in octets

如果是NAND Flash，需要选择NAND Flash相关的选项

修改内核文件

linux-2.6.15.b/drivers/mtd/maps/physmap.c

//linux

#define FLASH_PARTITION1_ADDR 0x00000000		//偏移地址

#define FLASH_PARTITION1_SIZE 0x001C0000		//大小

//ramdisk

#define FLASH_PARTITION2_ADDR 0x001C0000

#define FLASH_PARTITION2_SIZE 0x00240000

//ramdisk reserve

#define FLASH_PARTITION3_ADDR 0x00400000

#define FLASH_PARTITION3_SIZE 0x00380000

//uboot Environment

#define FLASH_PARTITION4_ADDR 0x00780000

#define FLASH_PARTITION4_SIZE 0x00020000

//uboot

#define FLASH_PARTITION0_ADDR 0x007A0000

#define FLASH_PARTITION0_SIZE 0x00060000

static struct mtd_partition mtd_parts[] = {

        {

                .name =         "Bootloader",

                .offset =       FLASH_PARTITION0_ADDR,

                .size =         FLASH_PARTITION0_SIZE

        },

        {

                .name =         "Kernel image",

                .offset =       FLASH_PARTITION1_ADDR,

                .size =         FLASH_PARTITION1_SIZE

        },

        {

                .name =         "Initial ramdisk image",

                .offset =       FLASH_PARTITION2_ADDR,

                .size =         FLASH_PARTITION2_SIZE

        },

        {

                .name =         "ramdisk reserve",

                .offset =       FLASH_PARTITION3_ADDR,

                .size =         FLASH_PARTITION3_SIZE

        },

        {

                .name =         "uboot Environment",

                .offset =       FLASH_PARTITION4_ADDR,

                .size =         FLASH_PARTITION4_SIZE

        },

};

#define PARTITION_COUNT (sizeof(mtd_parts)/sizeof(struct mtd_partition))

可参考地址：https://blog.csdn.net/wenlifu71022/article/details/4334962