uboot/doc/README.JFFS2
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   1JFFS2 options and usage.
   2-----------------------
   3
   4JFFS2 in U-Boot is a read only implementation of the file system in
   5Linux with the same name. To use JFFS2 define CONFIG_CMD_JFFS2.
   6
   7The module adds three new commands.
   8fsload  - load binary file from a file system image
   9fsinfo  - print information about file systems
  10ls      - list files in a directory
  11chpart  - change active partition
  12
  13If you boot from a partition which is mounted writable, and you
  14update your boot environment by replacing single files on that
  15partition, you should also define CONFIG_SYS_JFFS2_SORT_FRAGMENTS. Scanning
  16the JFFS2 filesystem takes *much* longer with this feature, though.
  17Sorting is done while inserting into the fragment list, which is
  18more or less a bubble sort. That algorithm is known to be O(n^2),
  19thus you should really consider if you can avoid it!
  20
  21
  22There only one way for JFFS2 to find the disk. It uses the flash_info
  23structure to find the start of a JFFS2 disk (called partition in the code)
  24and you can change where the partition is with two defines.
  25
  26CONFIG_SYS_JFFS2_FIRST_BANK
  27        defined the first flash bank to use
  28
  29CONFIG_SYS_JFFS2_FIRST_SECTOR
  30        defines the first sector to use
  31---
  32
  33TODO.
  34
  35        Remove the assumption that JFFS can dereference a pointer
  36        into the disk. The current code do not work with memory holes
  37        or hardware with a sliding window (PCMCIA).
  38