fal flash抽象层

-FAL_FLASH_DEV_TABLE设备表挂载不同flash设备

-FAL_PART_TABLE分区表对同一个flash挂载不同分区

-blocks 对不同颗粒度的flash进行分块

初始化

  • 执行 fal_init

-FAL_FLASH_DEV_TABLE注册flash设备

  1. fal_flash_init
  • 遍历注册表信息,执行flash初始化,与block分割
  1. fal_partition_init
  • 使用ROM保存分区表,每次查询并挂钩 FAL_PART_TABLE分区表
  • 使用FLASH保存分区表,仅需读取
  • 加载分区表,读取分区信息
  • 检查flash设备是否都存在

注册设备

  • 注册块设备, 或字符串设备,或MTD nor设备
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struct rt_mtd_nor_device

{

    struct rt_device parent;


    rt_uint32_t block_size;         /* The Block size in the flash */

    rt_uint32_t block_start;        /* The start of available block*/

    rt_uint32_t block_end;          /* The end of available block */


    /* operations interface */

    conststruct rt_mtd_nor_driver_ops* ops;

};


struct rt_mtd_nor_driver_ops

{

    rt_err_t (*read_id) (struct rt_mtd_nor_device* device);


    rt_ssize_t (*read)    (struct rt_mtd_nor_device* device, rt_off_t offset, rt_uint8_t* data, rt_size_t length);

    rt_ssize_t (*write)   (struct rt_mtd_nor_device* device, rt_off_t offset, constrt_uint8_t* data, rt_size_t length);


    rt_err_t (*erase_block)(struct rt_mtd_nor_device* device, rt_off_t offset, rt_size_t length);

};


struct fal_char_device

{

    struct rt_device                parent;

    conststruct fal_partition     *fal_part;

};


struct fal_blk_device

{

    struct rt_device                parent;

    struct rt_device_blk_geometry   geometry;

    conststruct fal_partition     *fal_part;

};

读写

  • 调用注册的接口