On Mi, 2015-08-05 at 23:30 +0200, Richard Weinberger wrote:
> Jörg,
> 
> Am 05.08.2015 um 23:22 schrieb Jörg Krause:
> > Hi,
> > 
> > after updating a custom build Linux Kernel from 4.0.8 to 4.1.4 my
> > system fails to attach an MTD partition. Note, that everything 
> > worked
> > fine with Linux Kernels before 4.1.
> 
> UBI Fastmap saw a lot of changes in 4.1.
> 
> > The error message is:
> > 	ubi_wl_get_peb: Unable to get a free PEB from user WL pool
> > 	autoresize: cannot auto-resize volume 0
> 
> Can you please share the full kernel log?
> Especially I'm interested in the fastmap pool sizes.

I attached the kernel boot log.

> 
> > The MTD partition has a size of 36 MB. The UBIFS image is created 
> > with:
> > 	mkfs.ubifs -v -F -m 2048 -e 124KiB -c 264 -d user -o user.ubifs
> > 
> > The UBI image is created with:
> > 	ubinize -v -o data.ubi -m 2048 -p 128KiB ubinize.ini
> > 
> > ubinize.ini:
> >     [user]
> >     mode=ubi
> >     image=user.ubifs
> >     vol_id=0
> >     vol_type=dynamic
> >     vol_name=user
> >     vol_flags=autoresize
> > 
> > 
> > It works, if I replace the vol_flags with vol_size=32480KiB. But 
> > that's
> > not a final solution for me.
> > 
> > Any idea what is wrong here?
> 
> Not sure. Maybe fastmap claims too much PEBs.
> BTW: Are you actually using fastmap or is it just enabled in your 
> kernel config?

It is enabled in the kernel config. Not sure how to use it.