config FS_FAT bool "Enable FAT filesystem support" help This provides support for reading images from File Allocation Table (FAT) filesystem. FAT filesystem is a legacy, lightweight filesystem. It is useful mainly for its wide compatibility with various operating systems. You can also enable CMD_FAT to get access to fat commands. config FAT_WRITE bool "Enable FAT filesystem write support" depends on FS_FAT help This provides support for creating and writing new files to an existing FAT filesystem partition. config FS_FAT_MAX_CLUSTSIZE int "Set maximum possible clustersize" default 65536 depends on FS_FAT help Set the maximum possible clustersize for the FAT 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.