linux内核 mtd分区

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

修改分区方式二

setenv bootargs root=/dev/mtdblock3 rootfstype=yaffs2 mtdparts=hinand:1M(u-boot)ro,64k(u-boot envs),32M(appfs)