[U-Boot] [PATCH 4/4] [v2] cmd_nand: add nand write.trimffs command

[Detlev Zundel <dzu@denx.de>]

Hi Ben,

> Add another nand write. variant, trimffs. This command will request of
> nand_write_skip_bad() that all trailing all-0xff pages will be
> dropped from eraseblocks when they are written to flash as-per the
> reccommended behaviour of the UBI FAQ [1].
>
> The function that implements this timming is the drop_ffs() function
> by Artem Bityutskiy, ported from the mtd-utils tree.
>
> [1] http://www.linux-mtd.infradead.org/doc/ubi.html#L_flasher_algo
>
> Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
> CC: Artem Bityutskiy <dedekind1@gmail.com>
> CC: Detlev Zundel <dzu@denx.de>
>
> ---
>
> Detlev,
> I did not do any erased-state checks since the implicit assumption
> in other nand commands is that the user is required to do their
> own erasing beforehand.

Yes, I have come to the same conclusion.

I have another request though - please add the new command to
doc/README.nand.  Thanks!

Cheers
  Detlev

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