config FS_JFFS2 bool "Enable JFFS2 filesystem support" help This provides support for reading images from JFFS2 (Journalling Flash File System version 2). JFFS2 is a log-structured file system for use with flash memory devices. It supports raw NAND devices, hard links and compression. config JFFS2_LZO bool "Enable LZO compression in JFFS2" depends on FS_JFFS2 help Enable LZO compression in the JFFS2 filesystem config JFFS2_NAND bool "Enable JFFS2 support for NAND flash" depends on FS_JFFS2 help Enable support for NAND flash as the backing store for JFFS2. config SYS_JFFS2_SORT_FRAGMENTS bool "Enable JFFS2 sorting of filesystem fragments (SLOW!)" depends on FS_JFFS2 help If you boot from a partition which is mounted writable, and you update your boot environment by replacing single files on that partition, you should also define CONFIG_SYS_JFFS2_SORT_FRAGMENTS. Scanning the JFFS2 filesystem takes *much* longer with this feature, though. Sorting is done while inserting into the fragment list, which is more or less a bubble sort. That algorithm is known to be O(n^2), thus you should really consider if you can avoid it!