Re: Static UBI volumes and ubiupdatevol ?

[Artem Bityutskiy <dedekind1@gmail.com>]

On Fri, 2010-12-17 at 13:31 +0100, Ricard Wanderlof wrote:
> On Fri, 17 Dec 2010, Artem Bityutskiy wrote:
> 
> > Ah, yes, you see, you know the things quite well yourself :-)
> 
> Well, I try to convince myself that I think I know, but there's always the 
> very real and likely possibilty that I'm wrong because I've misunderstood 
> something.
> 
> >> I guess I could read from the /dev/ubix_y device to just get the raw UBIFS
> >> data which shouldn't change even in the event of scrubbing? Or should I
> >> use gluebi to get both a raw mtd partition corresponding to the raw UBIFS
> >> data, as well as using UBIFS (on /dev/ubix_y) for the file system?
> >
> > No, gluebi is not needed, it would just give you an /dev/mtdZ device
> > with contents equivalent to /dev/ubiX_Y
> 
> So what does gluebi in fact add, does it just supply all the necessary 
> ioctl's to make /dev/ubiX_Y look like a /dev/mtdZ device, in addition to 
> the already existing functionality of being able to read and write to the 
> volume using read and write? (Yes, I could dig through the code, but even 
> though it might give me the answer on what it looks like right now, it 
> might not tell what the intention was...).

Original idea was to put JFFS2 on top of UBI volumes. Gluebi is doing
just that - turns UBI volume into an MTD device, then you have mount it
with JFFS2.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)