[U-Boot] [PATCH] cmd, nand: add an option to disable the verification when writing in raw mode

[Tom Rini]

On Wed, Jun 15, 2016 at 10:42:18AM +0200, Boris Brezillon wrote:

> Modern NANDs do not guarantee that data written in raw mode will not
> contain bitflips just after writing them. This is fine since the number
> of bitflips should be rather low and thus fixable by the ECC engine,
> but since we are reading data in raw mode to verify if they match the
> input data we cannot prevent failures if some bits are flipped.
> 
> The option of using standard mode to verify the data is not acceptable
> either, since one of the usage of raw mode is to allow flashing images
> that do not respect the standard NAND page layout or the default ECC
> config (this is the case on Allwinner platforms, where the ROM code
> tests several hardcoded configs, which are not necessarily matching the
> NAND characteristics).
> 
> Add an extension to the nand write.raw command allowing one to disable
> the verification step.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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