u-boot中的FAT命令

https://blog.youkuaiyun.com/voice_shen/article/details/8915463

[u-boot: v2013.04]

[Author: Bo Shen voice.shen@gmail.com]

1. Source Code

<common/cmd_fat.c>

此文件中定义了四个命令：fatload,fatls,fatinfo是定义"#define CONFIG_CMD_FAT"后就包括了。而fatwrite是需要再定义"#define CONFIG_FAT_WRITE"才会出现。

2. Usage

在使用FAT相关命令的时候，一定会有FAT文件系统的存储设备，此处举例使用U盘。

U-Boot> fatinfousb 0
Interface:  USB
  Device 0: Vendor: Kingston Rev: PMAP Prod: DataTraveler G3
            Type: Removable Hard Disk
            Capacity: 7441.6 MB = 7.2 GB (15240576 x 512)
Filesystem: FAT32 "KINGSTON   "
U-Boot> fatlsusb 0
      166   autorun.inf
    39334   tbi.png
    43134   tbi_2.png
    43006   tms.png
    55191   tck.png
    57357   rtck.png
    53981   tdo.png 
7 file(s), 0 dir(s)
 
U-Boot> fatloadusb 0 0x20000000 tbi.png
reading tbi.png
39334 bytes read in 161ms (244.3 KiB/s)

3. Source Code go through
   3.1 fatls --> do_fat_ls <common/cmd_fat.c> --> do_ls <fs/fs.c> --> fs_set_blk_dev <fs/fs.c> --> fs_ls <fs/fs.c> --> return 0;
   3.1.1 fs_set_blk_dev <fs/fs.c> --> get_device_and_partition <disk/part.c> --> (callback: fstype_info->probe) <fs/fs.c>
   3.1.2 fs_ls <fs/fs.c> --> fs_get_info <fs/fs.c> --> (callback: fstype_info->ls) <fs/fs.c>

3.2 fatinfo --> do_fat_fsinfo <common/cmd_fat.c> --> get_device_and_partition <disk/part.c> --> fat_set_blk_dev <fs/fat/fat.c> --> file_fat_detectfs <fs/fat/fat.c>
3.2.1 fat_set_blk_dev <fs/fat/fat.c> --> disk_read <fs/fat/fat.c>
3.2.2 file_fat_detectfs <fs/fat/fat.c> --> dev_print <disk/part.c> --> read_bootsectandvi <fs/fat/fat.c>

3.3 fatload --> do_fat_fsload --> do_load <fs/fs.c> --> fs_set_blk_dev < fs/fs.c> --> fs_read (callback: fstype_info->read)

---

作者：voice_shen
来源：优快云
原文：https://blog.youkuaiyun.com/voice_shen/article/details/8915463
版权声明：本文为博主原创文章，转载请附上博文链接！