JFFS2 options and usage.-----------------------JFFS2 in U-Boot is a read only implementation of the file system inLinux with the same name. To use JFFS2 define CFG_CMD_JFFS2.The module adds three new commands.fsload  - load binary file from a file system imagefsinfo  - print information about file systemsls      - list files in a directoryIf you boot from a partition which is mounted writable, and youupdate your boot environment by replacing single files on thatpartition, you should also define CFG_JFFS2_SORT_FRAGMENTS. Scanningthe JFFS2 filesystem takes *much* longer with this feature, though.Sorting is done while inserting into the fragment list, which ismore or less a bubble sort. That algorithm is known to be O(n^2),thus you should really consider if you can avoid it!There is two ways for JFFS2 to find the disk. The default way usesthe flash_info structure to find the start of a JFFS2 disk (calledpartition in the code) and you can change where the partition is withtwo defines.CFG_JFFS2_FIRST_BANK	defined the first flash bank to useCFG_JFFS2_FIRST_SECTOR	defines the first sector to useThe second way is to define CFG_JFFS_CUSTOM_PART and implement thejffs2_part_info(int part_num) function in your board specific files.In this mode CFG_JFFS2_FIRST_BANK and CFG_JFFS2_FIRST_SECTOR is notused.The input is a partition number starting with 0.Return a pointer to struct part_info or NULL for error;Ex jffs2_part_info() for one partition.---#if defined CFG_JFFS_CUSTOM_PART#include <jffs2/jffs2.h>static struct part_info part;struct part_info*jffs2_part_info(int part_num){	if(part_num==0){		if(part.usr_priv==(void*)1)			return &part;		memset(&part, 0, sizeof(part));		part.offset=(char*)0xFF800000;		part.size=1024*1024*8;		/* Mark the struct as ready */		part.usr_priv=(void*)1;		return &part;	}	return 0;}#endif---TODO.	Add a new command so it's actually possible to change	partition.	Remove the assumption that JFFS can dereference a pointer	into the disk. The current code do not work with memory holes	or hardware with a sliding window (PCMCIA).