[oe] [RFC] Add ubi volume image support, fix ubifs

[John Willis]

Hi,

Thanks for these patches. Looking good IMHO.

> >> Really?  iirc from the mounting commandline stuff that means you
> have to
> >> pass in machine-rootfs rather than just rootfs, ie
> >> root=ubi0:machine-rootfs not root=ubi0:rootfs
> >
> > You'll have to update your bootloaders anyway, so cutting down on
> > 'flashed wrong machine' errors is a big win :)
> 
> The PoV we have is of starting things from scratch, so that's not
> something we worry about.  How about this so distros can take care of
> it?

Yep, I can't really see many normal OE users will have converted existing
images over to UBI so it seems like the right way to start is as we mean to
go on.

I'll test these patches on the Pandora NAND image later (they are along the
same lines as the patches I have been working on for UBI/UBIFS support but
have the extra bonus feature of actually looking like they work). 
It will make a nice change from post processing a TAR ;).
 
Regards,

John Willis