I have select jffs2 support of linux on at91rm9200 board,and once system
boot,the mtd can auto configuare the nand flash and give partitions.But I can not mount jffs2 on nand flash.After I excute the following command
#mount -t jffs2 /dev/mtdblock/1 /mnt/mtd
#mkdir /mnt/mtd/tmp
and reboot system,the tmp directory is missing,this means the jffs2 filesystem is not installed onto nand flash.
Could anyone tell me how to install jffs2 on nand flash?

why?umount jffs2?I have try it,but still does not work.