OK6410A 开发板 (三) 24 u-boot-2021.01 boot 解析 U-boot 镜像运行部分 fs-fat

相关配置

CONFIG_CMD_FAT=y

相关文件

fs/fat/fat.c

fs/fs_internal.c

fs/fs.c

cmd/fat.c

命令及命令的使用

fatinfo   - print information about filesystem

fatload   - load binary file from a dos filesystem

fatls     - list files in a directory (default /)

fatsize   - determine a file's size

=> fatinfo mmc 0:1 

Interface:  MMC

  Device 0: Vendor: Man 0000fe Snr 00023d01 Rev: 0.0 Prod: SD16G 

            Type: Removable Hard Disk

            Capacity: 30474.0 MB = 29.7 GB (62410752 x 512)

Filesystem: FAT16 "NO NAME 

=> fatload mmc 0:1 0x50008000 uImage

1828792 bytes read in 277 ms (6.3 MiB/s)

=> fatls mmc 0:1                    

  1828792   uImage

1 file(s), 0 dir(s)

=> fatsize mmc 0:1 uImage

// 没有任何打印

命令解析

可以从命令解析的角度了解 fat fs

fatinfo

do_fat_fsinfo cmd/fat.c

blk_get_device_part_str disk/part.c

fat_set_blk_dev fs/fat/fat.c

file_fat_detectfs fs/fat/fat.c

printf("n  Device %d: ", cur_dev->devnum);

dev_print(cur_dev); disk/part.c

read_bootsectandvi(&bs, &volinfo, &fatsize) fs/fat/fat.c

memcpy(vol_label, volinfo.volume_label, 11)

vol_label[11] = '';

volinfo.fs_type[5] = '';

printf("Filesystem: %s "%s"n", volinfo.fs_type, vol_label);

fatls

do_fat_ls cmd/fat.c

do_ls fs/fs.c

fs_set_blk_dev fs/fs.c

blk_get_device_part_str disk/part.c

info->probe/fat_set_blk_dev fs/fat/fat.c

fs_ls fs/fs.c

struct fstype_info *info = fs_get_info(fs_type); fs/fs.c

info->ls(dirname);/fs_ls_generic fs/fs.c

fs_opendir fs/fs.c

struct fstype_info *info = fs_get_info(fs_type); fs/fs.c

info->opendir(filename, &dirs);/fat_opendir fs/fat/fat.c

dirs->desc = fs_dev_desc; fs/fs.c

dirs->part = fs_dev_part; fs/fs.c

while(dent = fs_readdir(dirs)) fs/fs.c

switch(dent->type){

case FS_DT_DIR:

printf("            %s/n", dent->name);break;

case FS_DT_LNK:

printf("       %sn", dent->name);break;

default:

printf(" %8lld   %sn", dent->size, dent->name);break;

}

fs_closedir fs/fs.c

printf("n%d file(s), %d dir(s)nn", nfiles, ndirs);

fatload

do_fat_fsload cmd/fat.c

do_load fs/fs.c

_fs_read fs/fs.c

fs_read_lmb_check fs/fs.c

info->read/file_fat_read_at fs/fat/fat.c

malloc_cache_aligned include/memalign.h

fat_itr_root// 填充itr fs/fat/fat.c

fat_itr_resolve fs/fat/fat.c

get_contents // 搬运数据 fs/fat/fat.c

get_cluster fs/fat/fat.c

disk_read(startsect, idx, buffer); fs/fat/fat.c

blk_dread drivers/block/blk-uclass.c

if (size)disk_read(startsect, 1, tmpbuf);

memcpy(buffer, tmpbuf, size);

printf("%llu bytes read in %lu ms", len_read, time);

应用

=> fatload mmc 0:1 51000000 2led_c.bin

1049 bytes read in 20 ms (50.8 KiB/s)

=> go 51000000

## Starting application at 0x51000000 ...

// 此时会看到 led灯闪烁

// 一定要主要加载地址和链接地址和运行地址的关系