Boot linux from cramfs on USB

[Jakob Malm]

Hi,

How would I boot a linux system in a cramfs image on USB? I don't seem
to be able to mount such an image:

barebox:/ usb
USB: scanning bus for devices...
Bus 001 Device 002: ID 0dd8:1728 Flash Drive
Using index 1 for the new disk
Bus 001 Device 001: ID 0000:0000 EHCI Host Controller
2 USB Device(s) found
barebox:/ mkdir /usb
barebox:/ mount /dev/disk1.0 fat /usb
barebox:/ mkdir /cramfs
barebox:/ mount /usb/rootfs.cramfs cramfs /cramfs
mount: Invalid argument

Is it not possible to mount a cramfs image file?

This is on a Freescale MX-23 EVK board.

Thanks,
Jakob Malm