How to use jffs2.?

[HS8JCV]

Hi all.
I use AT91RM9200DK and linux version 2.4.27-vrs1.
This kernel support jffs2 because I saw at startup(dmesg).
but I run command cat /proc/mtd and df -h .
cat /proc/mtd
dev:    size   erasesize  name

df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                14.5M      6.7M      7.8M  46% /

Flash on my board 8 M (intel E28F640)
I will save data into my board.

How to use jffs2.?
Please,suggest me for next step.

Best Regard
Mr.X