[J-u-boot.git] / doc / README.JFFS2_NAND

JFFS2 NAND support:

To enable, use the following #define in the board configuration file:

#define CONFIG_JFFS2_NAND 1

Configuration of partitions is similar to how this is done in  U-Boot
for  JFFS2  on top NOR flash. If a single partition is used, it can be
configured using the following #defines in the configuration file:

#define CONFIG_JFFS2_NAND_DEV 0			/* nand device jffs2 lives on */
#define CONFIG_JFFS2_NAND_OFF 0			/* start of jffs2 partition */
#define CONFIG_JFFS2_NAND_SIZE 2*1024*1024	/* size of jffs2 partition */

If more than a single partition is desired, the user can define a
CONFIG_SYS_JFFS_CUSTOM_PART macro and implement a

	struct part_info* jffs2_part_info(int part_num)

function in a board-specific module. An example of such function is
available in common/cmd_jffs2.c

The default configuration for the DAVE board has a single JFFS2
partition of 2 MB size.
Commit	Line	Data
998eaaec WD	1	JFFS2 NAND support:
998eaaec WD	2
0ff5d146	3	To enable, use the following #define in the board configuration file:
998eaaec WD	4
	5	#define CONFIG_JFFS2_NAND 1
	6
	7	Configuration of partitions is similar to how this is done in U-Boot
445093d1	8	for JFFS2 on top NOR flash. If a single partition is used, it can be
998eaaec WD	9	configured 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 210241024 /* size of jffs2 partition */
	14
	15	If more than a single partition is desired, the user can define a
6d0f6bcf	16	CONFIG_SYS_JFFS_CUSTOM_PART macro and implement a
998eaaec WD	17
	18	struct part_info* jffs2_part_info(int part_num)
	19
	20	function in a board-specific module. An example of such function is
	21	available in common/cmd_jffs2.c
	22
	23	The default configuration for the DAVE board has a single JFFS2
	24	partition of 2 MB size.