ESH45 Android：无法访问 sdcard 目录

现象:
- 内部存储没有见到sdcard目录,shell进入sdcard目录发现没有文件,正常情况下应该存在 Download,Music,Movies等文件夹
检查:
- sdcard对应mmc为/dev/block/mmcblk0p1

解决方案:

修改fsck_msdos

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```diff --git a/fsck_msdos/boot.c b/fsck_msdos/boot.c
index 5326a45..0d56697 100644
--- a/fsck_msdos/boot.c
+++ b/fsck_msdos/boot.c
@@ -269,7 +269,7 @@ readboot(dosfs, boot)
    if (boot->NumFatEntries < boot->NumClusters) {
        pfatal("FAT size too small, %u entries won't fit into %u sectors\n",
               boot->NumClusters, boot->FATsecs);
-               return FSFATAL;
+               //return FSFATAL;//new MMC HW VERSION WILL FAIL DON'T KNOW WHY
    }
    boot->ClusterSize = boot->BytesPerSec * boot->SecPerClust;
```