Beagleboard の要求する FAT は、けっこう厳しい?

なんか

• BeagleBoard - Linux on ARM - eewiki

に書いてあるように VFAT を用意しているはずなんだけど、うまくいくときと行かないときがあります。SD カード上の MLO が読めないです。以下は、うまく動くパターン。備忘録です。

$ sudo fdisk /dev/sdb
You will not be able to write the partition table.

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): p

Disk /dev/sdb: 1015 MB, 1015808000 bytes
32 heads, 61 sectors/track, 1016 cylinders
Units = cylinders of 1952 * 512 = 999424 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           2          52       49776    e  W95 FAT16 (LBA)
/dev/sdb2              53        1016      940864   83  Linux

Command (m for help): ^C

で、

$ sudo fsck.vfat -v /dev/sdb1
dosfsck 3.0.7 (24 Dec 2009)
dosfsck 3.0.7, 24 Dec 2009, FAT32, LFN
Checking we can access the last sector of the filesystem
Boot sector contents:
System ID "mkdosfs"
Media byte 0xf8 (hard disk)
       512 bytes per logical sector
      2048 bytes per cluster
         1 reserved sector
First FAT starts at byte 512 (sector 1)
         2 FATs, 16 bit entries
     50176 bytes per FAT (= 98 sectors)
Root directory starts at byte 100864 (sector 197)
       512 root directory entries
Data area starts at byte 117248 (sector 229)
     24830 data clusters (50851840 bytes)
61 sectors/track, 32 heads
         0 hidden sectors
     99552 sectors total
Checking for unused clusters.
/dev/sdb1: 82 files, 3504/24830 clusters