Are there any instructions on how to create a ROM image rootfs file?   I saw the wiki page  I am unfamiliar with a .ubi and Googleing around did not enlighten me.      

Also is there a way to pull a ubi image of the device and expand it out to a directory tree?   The second question is not so important because I can always tar off the root file system to an SD card.

Thank for your help,

David Moffatt.