[U-Boot] [RFC] FAT errors

[Heinrich Schuchardt]

Currently we do no have a maintainer for the FAT file system. Takahiro
has done a great job fixing some of the most prominent deficiencies. But
still the driver is not in good shape:

I once again ran upon errors in FAT when executing the UEFI SCT.

Here is some of the output of
dosfsck -w -r -l -a -v -t
The full output has hundreds of errors recorded.

Orphaned long file name part "Sct.log"
   Auto-deleting.
Orphaned long file name part "Sct.log"
   Auto-deleting.
/Log/RuntimeServicesTest/VariableServicesTest0/QueryVariableInfo_Conf_0_0_61758774-91A3-47DD-BDBD-B81094A5F62D.log
   Duplicate directory entry.
   First    Size 4712 bytes, date 01:00:00 Dec 31 1979
   Second   Size 5086 bytes, date 01:00:00 Dec 31 1979
   Auto-renaming second.
   Renamed to FSCK0000.008

BareBox is using a (somewhat outdated) copy of this library with a
little bit of wrapper code:

FatFs - Generic FAT Filesystem Module
http://elm-chan.org/fsw/ff/00index_e.html
http://elm-chan.org/fsw/ff/arc/ff13c.zip

The same library is also used for Arduinos:
https://github.com/stm32duino/FatFs

Shouldn't we try just the same?

Best regards

Heinrich