detect and manage power cut on MLC NAND

[Richard Weinberger]

Am 21.03.2015 um 02:48 schrieb Qi Wang 王起 (qiwang):
> For this method, my idea is we can consider page 1 and page4 as one 
> page, to program page 1 and page 4 together. So if power cut occur, 
> both page 1 and page 4 (But one page corruption in software view)will 
> corrupt at same time, won't have issue for UBI/UBIFS.

I think we could add a new mtd driver which merges paired pages into bigger
pages. We already have "funky" mtd drivers like mtd_concat. What about a mtd_unpair?
This mtd driver could also do the scrambling.

Boris, what do you think?

Thanks,
//richard