linux内核 mtd分区

「爱情、让人受尽委屈。」 2021-10-29 14:46 367阅读 0赞

**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][https_blog.csdn.net_wenlifu71022_article_details_4334962]

[https_blog.csdn.net_wenlifu71022_article_details_4334962]: https://blog.csdn.net/wenlifu71022/article/details/4334962