Hmm, kinda hard. Shouldn't be impossible though. In the process of creating this image it might help to be able to boot from sd/mmc though. It's hard to work with the jffs2 filesystem on a desktop as it requires either a real NAND device or a free chunk of RAM equal in size to the jffs2 fs you're trying to make. This isn't always easy to come by when that size is 256MB. If you could boot from SD and remount the internal flash read-only you could probably just use dd on /dev/mtdblock4 . Failing that, you could rsync / to your desktop, but then you'd still need to copy it into a jffs2 image before you could flash it. Hope that helps. Good luck!

-John