[U-Boot] [PATCH] mtd: nand: fsl_ifc: Fix handling of bitflips in erased pages

[Pavel Machek <pavel@denx.de>]

On Mon 2017-06-12 13:50:00, Darwin Dingel wrote:
> This is a fix made for the fsl_ifc_nand driver on linux kernel by
> Pavel Machek and is applied to uboot. It is currently on applied on
> linux-mtd.
> 
> https://patchwork.kernel.org/patch/9758117/
> 
> IFC always raises ECC errors on erased pages. It is only ignored when
> the buffer is checked for all 0xFF by is_blank(). The problem is a
> single bitflip will cause is_blank() and then mtd_read to fail. The fix
> makes use of nand_check_erased_ecc_chunk() to check for empty pages
> instead of is_blank(). This also makes sure that reads are made at ECC
> page size granularity to get a proper bitflip count. If the number of
> bitflips does not exceed the ECC strength, the page is considered empty
> and the bitflips will be corrected when data is sent to the higher
> layers (e.g. ubi).

Thanks for porting the fix in u-boot.

I don't have hardware to test, but the fix looks good.

Acked-by: Pavel Machek <pavel@denx.de>
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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