Cannot disable Zephyr file system with nRF Connect SDK 2.4.0

[MKir]

On our platform we don't use the filesystem, so we would like to exclude it from the build. For this reason, we have been disabling it in Kconfig (CONFIG_FILE_SYSTEM=n in prj.conf).

This has worked well with SDK version 2.3.0. However, with 2.4.0 this now results in the following error:

C:\ncs\v2.4.0\modules\fs\fatfs\ff.c:499:2: error: #error LFN must be enabled when enable exFAT
499 | #error LFN must be enabled when enable exFAT

This happens even if I explicitly add CONFIG_FS_FATFS_EXFAT=n to the configuration file (although as I understand it, this should follow from CONFIG_FILE_SYSTEM=n).

The same happens if I remove all these settings from prj.conf and disable the file system via the Kconfig GUI (Subsystems and OS Services -> File Systems -> File system support).

Is this a known error? Or is there some additional setting that I know have to use?

[runsiv]

Hi, 

I have tried to reproduce it at my end, I see no error when trying to compile with CONFIG_FILE_SYSTEM=n and a 5340 cpapp_ns. Can you try to delete your build folder and to a pristine build? 

Regards

Runar

[MKir]

Hi Runar,

I've tried it and did not help. I will have to analyze it further.

[runsiv]

Hi

Sorry for the delay, I have been out of office after your reply. Did you make any progress? 

Regards 

Runar

[MKir]

Sorry for the slow answer, another project took priority. Tried migration from scratch again, now it works. I don't know what is different, but the issue is gone, so there is nothing more to do.

Thanks for verifying it on your side, gave me the reassurance that it should work.