Re: [EXT] [PATCH v2 3/3] mtd: rawnand: micron: Address the shallow erase issue

[Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>]

On Thu, 7 May 2020 09:28:59 +0000
"Bean Huo (beanhuo)" <beanhuo@xxxxxxxxxx> wrote:

> Hi Richard
> Thanks. 
> 
> How about this special  situation: 
> 
> Page 0(EC) is good;
> Page 1(VID) is bad;

UBI should reject the LEB because of this VID corruption, but I'm not
sure how well that works when you add fastmap in the mix :-/.

> Page 2 (data) is good;
> Page 3( data) is bad, or contain filling pattern.
> Page 4 (data) is good, or empty;
> Page 5( data) is bad, or contain filling pattern.
> Page 6 (data) is good, or empty;
> .....
> 
> 
> Bean
> 
> > 
> > ----- Ursprüngliche Mail -----  
> > >> UBI scans only headers during attach. If you don't touch these, no way.  
> > >
> > > Sorry, I misunderstood what you meant by payload. UBI should schedule
> > > the PEB for erase if the EC/VID header is corrupted.  
> > 
> > UBI even tries to recover from such a situation. If only the EC header is bad, it
> > will create a new one. Only of the VID header is bad/missing and the payload is
> > corrupted (ECC errors or bit-flips) it will erase it.
> > 
> > A missing VID header plus good payload will cause UBI to stop attaching since it
> > violates the IO model.
> > 
> > Thanks,
> > //richard  


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