Failedto read big file with "Invald FAT entry' from USB disk (FAT16)

[Simon Glass]

+Heinrich Schuchardt

On Tue, 24 Oct 2023 at 19:34, target <simitel at 163.com> wrote:
>
> I am using u-boot 2017.03 in my system and enabled the debug in fs/fat/fat.c
> I had a USB disk formatted in FAT16 in Linux, I put a bigfile.bin into / in the USB disk and plugged the disk into by board.
> Then I want to read/load the bigfile.bin into RAM with u-boot's fatload command, I did followings.
>
>
> # usb reset
> # fatls usb 0, it showd,
> VFAT Support enabled
> FAT16, fat_sect: 128, fatlength: 128
> Rootdir begins at cluster: 0, sector: 384, offset: 30000
> Data begins at: 256
> Sector size: 512, cluster size: 128
> FAT read(sect=384, cnt:2), clust_size=128, DIRENTSPERBLOCK=16
>  36438016   bigfile.bin
>      1012   s01syslogd
>      1004   s02klogd
>      1876   s02sysctl
>      1684   s20urandom
>       214   s21mount
> END LOOP: buffer_blk_cnt=0   clust_size=128
> FAT read(sect=385, cnt:2), clust_size=128, DIRENTSPERBLOCK=16
>      1635   s30dbus
>       438   s40network
> RootDentname == NULL - 13
>
>
> 8 file(s), 0 dir(s)
> # fatload usb 0 0x100000 bigfile.bin
> reading bigile.bin
> VFAT Support enabled
> FAT16, fat_sect: 128, fatlength: 128
> Rootdir begins at cluster: 0, sector: 384, offset: 30000
> Data begins at: 256
> Sector size: 512, cluster size: 128
> FAT read(sect=384, cnt:2), clust_size=128, DIRENTSPERBLOCK=16
> Rootvfatname: |bigfile.bin|
> RootName: bigfile.bin, start: 0x3, size:  0x22c0000
> Filesize: 36438016 bytes
> 36438016 bytes
> FAT16: entry: 0x0003 = 3, offset: 0x0003 = 3
> FAT16: ret: 00000004, offset: 0003
> FAT16: entry: 0x0004 = 4, offset: 0x0004 = 4
> FAT16: ret: 00000005, offset: 0004
> FAT16: entry: 0x0005 = 5, offset: 0x0005 = 5
> FAT16: ret: 00000006, offset: 0005
> FAT16: entry: 0x0006 = 6, offset: 0x0006 = 6
> FAT16: ret: 00000007, offset: 0006
> FAT16: entry: 0x0007 = 7, offset: 0x0007 = 7
> FAT16: ret: 00000008, offset: 0007
> FAT16: entry: 0x0008 = 8, offset: 0x0008 = 8
> FAT16: ret: 00000009, offset: 0008
> FAT16: entry: 0x0009 = 9, offset: 0x0009 = 9
> FAT16: ret: 0000000a, offset: 0009
> .....
> .....
> FAT16: entry: 0x020e = 526, offset: 0x020e = 526
> FAT16: ret: 0000020f, offset: 020e
> FAT16: entry: 0x020f = 527, offset: 0x020f = 527
> FAT16: ret: 00000210, offset: 020f
> FAT16: entry: 0x0210 = 528, offset: 0x0210 = 528
> FAT16: ret: 0000ffff, offset: 0210
> gc - clustnum: 3, startsect: 640
> FAT16: entry: 0x0210 = 528, offset: 0x0210 = 528
> FAT16: ret: 0000ffff, offset: 0210
> curclust: 0xffff
> Invalid FAT entry
> Size: 36438016, got: 34471936
>
>
> I have tried many times, even with "fatload usb 0 0x100000 bigfile.bin 2000000", it still failed with above error.
> I can not test newer version of u-boot, since there are lots of old drivers I am using.
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