Howto create a new jffs2

[Krypton]

I added my new 'test' MTD partition.
I'd like to add a new little home.jffs2
How can I mount a new little jffs2 partition when I have 
linux prompt ?
Thank you  

Creating 5 MTD partitions on "SA1100 flash":

0x00000000-0x00020000 : "firmware"

0x00020000-0x00040000 : "params"

0x00040000-0x00140000 : "kernel"

0x00140000-0x00fe0000 : "rootdisk"

0x00fe0000-0x01000000 : "test"