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BareBox is using a (somewhat outdated) copy of this library with a little bit of wrapper code: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