Via USB:

Load kernel & initfs and boot it:
$ 0xFFFF -m initfs -m kernel -l -b

Flash kernel:
$ 0xFFFF -m kernel -f

Flash FIASCO image:
$ 0xFFFF -M image.fiasco -f

Flash only kernel from FIASCO image:
$ 0xFFFF -M image.fiasco -t kernel -f

Reboot:
$ 0xFFFF -r

Identify device:
$ 0xFFFF -I


On device (need nanddump from mtd-utils):

Dump all images to current directory:
$ 0xFFFF -e

Dump all images to one fiasco file:
$ 0xFFFF -E dump.fiasco


FIASCO packaging:

Show FIASCO archive:
$ 0xFFFF -M image.fiasco -i

Unpack fiasco image to current directory:
$ 0xFFFF -M image.fiasco -u

Generate new fiasco image from files xloader.bin, nolo.bin, zImage, rootfs and append device&version information (xloader for RX-51 hw revision: 2101 and 2102, version 1.0)
$ 0xFFFF -m RX-51:2101,2102:1.0:xloader:xloader.bin -m RX-51:2101,2102:1.0:secondary:nolo.bin -m 2.6.28:kernel:zImage -m rootfs -g image.fiasco

For all options see help:
$ 0xFFFF -h


0xFFFF can detect more image types from file header. If autodetection not working, see syntax of param -m ([[[dev:[hw:]]ver:]type:]file[%lay])