[U-Boot] Porting UBI fixes (specially fastmap's) to U-Boot

[Richard Weinberger <richard@nod.at>]

Hi!

Am 03.10.2015 um 06:27 schrieb Heiko Schocher:
>>> According to Richard Weinberger, UBI fastmap is broken in U-Boot.
>>> There are plenty
>>> of fixes in Linux that we should pull in U-Boot to fix it.
> 
> Thanks for pointing!
> 
>> BTW: it is not broken in terms of you broke it.
> 
> Puuh ;-)
> 
> In what way is it broken? If we update to 4.1, will ubi work (mount
> an existing UBI partition with fastmap) on existing boards?

The on-flash layout did not change, so it should work.

The "old" fastmap code had a number of issues, mostly related to powercuts
and some logical issues.
In 4.1 it saw a huge amount of rework and fixes, including UBI core code.

>> It is just the old fastmap version. In v4.1 fastmap saw
>> a massive update. Sadly this changes are a way to big for the stable tree.
> 
> What do you mean with "for the stable tree" ?

I was under the assumption that you are porting all UBI fixes to u-boot which are marked for stable.
As the fastmap rework turned out to be much more than a few single fixes they are not
in the Linux stable tree.

>>> Maybe you are already aware of this and you have some work-in-progress
>>> patches to share?
>>> Otherwise, I might be able to spend some time working on this in the next weeks.
>>
>> I'll happily help you!
> 
> I am next week in Dublin on the ELCE so I have no time to look into
> this issue ... maybe the week after ...

I'm also at ELCE, maybe we can discuss this also in person.

Thanks,
//richard