[U-Boot] UBI problems on current u-boot

[Holger Brunck <holger.brunck@keymile.com>]

Hi Stefan,

On 09/13/2011 09:39 AM, Stefan Roese wrote:
> Hi Holger,
> 
> On Monday 12 September 2011 19:16:33 Holger Brunck wrote:
>> I have seen in mainline kernel this fix in the ubi layer:
>>
>> commit b86a2c56e512f46d140a4bcb4e35e8a7d4a99a4b
>> Author: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
>> Date:   Sun May 24 14:13:34 2009 +0300
>>
>>     UBI: do not switch to R/O mode on read errors
>>
>>     This patch improves UBI errors handling. ATM UBI switches to
>>     R/O mode when the WL worker fails to read the source PEB.
>>     This means that the upper layers (e.g., UBIFS) has no
>>     chances to unmap the erroneous PEB and fix the error.
>>     This patch changes this behaviour and makes UBI put PEBs
>>     like this into a separate RB-tree, thus preventing the
>>     WL worker from hitting the same read errors again and
>>     again.
>>
>> [...]
>>
>> And this sounds like the problem I see in u-boot.
> 
> Yes, very likely.
> 
>> But this patch is not
>> easy to port onto u-boot because previously undergoing changes in the
>> kernels ubi layer...
> 
> Correct. UBI has undergone many changes since the integration into U-Boot back 
> in the end of 2008 (nearly 3 years ago now). Perhaps the best would be to re-
> synch with the latest Linux UBI version. But this sounds like quite a lot of 
> work as well...
> 

if found a way to port only this patch. But I had to do some changes to  it.
E.g. exchange the constants for errors with numeric values as present in u-boots
ubi version. And remove setting of the constants (MOVE_TARGET_RD_ERR) values
which are not evaluated in u-boots ubi version. This fixes my problem. Should I
post this patch?

Regards
Holger