Howto create a new jffs2

[Krypton]

-----> > >> Creating 5 MTD partitions on "SA1100 flash":
> > >> 0x00000000-0x00020000 : "firmware"
> > >> 0x00020000-0x00040000 : "params"
> > >> 0x00040000-0x00140000 : "kernel"
> > >> 0x00140000-0x00fe0000 : "rootdisk"
> > >> 0x00fe0000-0x01000000 : "test"
> > 
> > > Try, mount -t jffs2 /dev/mtdblock4 <dir>
> > 
> > I already have tried this but unsuccesfully.
> > Error : "No such file or directory"
> > 
> > Other suggestions ?
> 
> what is the output of "ls -l /dev/mtd*" ?
> 

No such file or directory