NAND-FLASH YAFFS

stm32f407vgt6使用虚拟文件系统对接yaffs2

发布于 2023-04-07 14:13:38 浏览：947 订阅该版

nand flash初始化成功可以进行读写；
但在挂载yaffs文件系统时，挂载不上去，使用yaffs最新的软件包。

```c
    yaffs_start_up();
    mtd_nand = rt_device_find("MT29F");
    if (!mtd_nand)
    {
          rt_kprintf("find MT29F failed! \n");
          return RT_ERROR;
    }
    res = rt_device_open(mtd_nand, RT_DEVICE_OFLAG_RDWR);
    res = dfs_mount(mtd_nand->parent.name, "/", "yaffs", 0, 0);
    if (res == RT_EOK)
    {
         rt_kprintf("Mount YAFFS on NAND successfully\n");
    }
    else
    {
        rt_kprintf("Mount YAFFS on NAND failed\n");
        rt_kprintf("res %d\n", res);
//        if (res == RT_EOK)
//        {
//            res = dfs_mount(mtd_nand->parent.name, "/", "yaffs", 0, 0);
//       }

}

```
```c
int yaffs_start_up(void)
{
    static struct yaffs_dev *flash = RT_NULL;
    rt_mtd_nand_t mtd_nand;

if (flash != RT_NULL)
    {
        return 0;
    }
    //查找设备看是否存在MTD device 的root设备，
    mtd_nand = (rt_mtd_nand_t)rt_device_find("MT29F");
    if (mtd_nand == RT_NULL)
    {
        return -1;
    }
    else
    {
        rt_kprintf("yaffs_start_up--find nand device OK\r\n");
    }
    if (mtd_nand->parent.type != RT_Device_Class_MTD)
    {
        return -1;
    }
    else
    {
        rt_kprintf("yaffs_start_up--nand device class type OK\r\n");
    }
    flash = (struct yaffs_dev *)rt_malloc(sizeof(struct yaffs_dev));
    rt_memset(flash, 0, sizeof(struct yaffs_dev));

flash->param.name = "/MT29F";
    flash->param.n_caches = 0;
    flash->param.start_block = mtd_nand->block_start;
    flash->param.end_block = mtd_nand->block_end;
    flash->param.total_bytes_per_chunk = mtd_nand->page_size;
    flash->param.spare_bytes_per_chunk = mtd_nand->oob_size;
    flash->param.chunks_per_block = mtd_nand->pages_per_block;
    flash->param.use_nand_ecc = 0;
    flash->param.is_yaffs2 = 1;
    flash->param.n_reserved_blocks = 4;
    flash->driver_context = mtd_nand;
    mtd_nand->priv = flash;

yaffsfs_OSInitialisation();
    yaffs_mtd_drv_install(flash);
    yaffs_add_device(flash);

return 0;
}

```