Uboot下实现sd卡的烧写分区升级

最新推荐文章于 2025-02-28 21:31:12 发布

fxs19910121

最新推荐文章于 2025-02-28 21:31:12 发布

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分类专栏： linux系统编程文章标签： c语言 linux

本文链接：https://blog.youkuaiyun.com/fxs19910121/article/details/119152190

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整个流程就是在uboot下，识别出sd卡，接着对sd卡进行vfat格式化，根据文件名读出升级包数据到内存，然后对升级包进行解析，解析出对应分区的镜像文件，进行分区的烧写升级。

以SD卡mmc设备为例

static int mmc_stor_init(void)
{
   struct mmc *mmc;
   int dev_num=0;
#ifdef CONFIG_EMMC
   dev_num=1;
#else
   dev_num=0;
#endif
   mmc = find_mmc_device(dev_num);
   if (NULL == mmc) {
       printf("No mmc driver found!\n");
       return -1;
   }

return 0;
}

static void mmc_stor_exit(void)
{
}

struct mtd_info *nand_flash;
static int nand_flash_init(void)
{
nand_flash = get_nand_dev_by_index(0);
return 0;
}

static int nand_flash_erase(unsigned long offset, unsigned long len)
{
   int ret;
   unsigned long erase_len;
   unsigned long erase_step;
   unsigned long length;
   nand_erase_options_t opts;

memset(&opts, 0, sizeof(opts));

   length = len;
   erase_step = nand_flash->erasesize;
   erase_len = length;
   opts.length = erase_step;
   opts.offset = offset;
   opts.quiet = 1;

   while (length > 0) {
       if (length < erase_step)
           erase_step &#