config FS_EXFAT bool "Enable exFAT filesystem support" help This provides support for reading images from File Allocation Table (FAT) filesystem. exFAT filesystem is a legacy, lightweight filesystem. It is useful mainly for its wide compatibility with various operating systems. You can also enable CMD_EXFAT to get access to exfat commands. config EXFAT_WRITE bool "Enable exFAT filesystem write support" depends on FS_EXFAT help This provides support for creating and writing new files to an existing exFAT filesystem partition. config FS_EXFAT_MAX_CLUSTSIZE int "Set maximum possible clustersize" default 262144 depends on FS_EXFAT help Set the maximum possible clustersize for the exFAT filesytem. This is the smallest amount of disk space that can be used to hold a file. Unless you have an extremely tight memory memory constraints, leave the default.