uboot/doc/README.JFFS2_NAND
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   1JFFS2 NAND support:
   2
   3To ebable, use the following #define in the board configuration file:
   4
   5#define CONFIG_JFFS2_NAND 1
   6
   7Configuration of partitions is similar to how this is done in  U-Boot
   8for  JFFS2  on top NOR flash. If a single parition is used, it can be
   9configured using the following #defines in the configuration file:
  10
  11#define CONFIG_JFFS2_NAND_DEV 0                 /* nand device jffs2 lives on */
  12#define CONFIG_JFFS2_NAND_OFF 0                 /* start of jffs2 partition */
  13#define CONFIG_JFFS2_NAND_SIZE 2*1024*1024      /* size of jffs2 partition */
  14
  15If more than a single partition is desired, the user can define a
  16CONFIG_SYS_JFFS_CUSTOM_PART macro and implement a
  17
  18        struct part_info* jffs2_part_info(int part_num)
  19
  20function in a board-specific module. An example of such function is
  21available in common/cmd_jffs2.c
  22
  23The default configuration for the DAVE board has a single JFFS2
  24partition of 2 MB size.
  25