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

Tom Rini
2016-06-24T23:26:44Z

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@free-electrons.com>

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

--
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: Digital signature
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20160624/7f7ca895/attachment.sig>