RT-Thread Components > Device virtual file system ---> -*- Using device virtual file system [*] Using working directory (2) The maximal number of mounted file system (2) The maximal number of file system type (16) The maximal number of opened files [*] Enable elm-chan fatfs elm-chan's FatFs, Generic FAT Filesystem Module ---> Support long file name (3: LFN with dynamic LFN working buffer on the heap) ---> (X) 3: LFN with dynamic LFN working buffer on the heap (4096) Maximum sector size to be handled. [*] Enable sector erase feature RT-Thread Components > POSIX layer and C standard library [*] Enable libc APIs from toolchain