linux-kernel - Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip

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Date:	Thu, 8 Dec 2011 12:43:52 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	LiuShuo <b35362@...escale.com>
CC:	<shuo.liu@...escale.com>, <dwmw2@...radead.org>,
	<Artem.Bityutskiy@...ia.com>, <linux-mtd@...ts.infradead.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <leoli@...escale.com>
Subject: Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support
 large-page Nand chip

On 12/08/2011 04:44 AM, LiuShuo wrote:
> 于 2011年12月08日 03:11, Scott Wood 写道:
>> And if we do want to make such assumptions, we could rip out all usage
>> of index/column here, and just handle "oob" and "full page" cases.
> The function nand_do_write_ops() in nandbase.c is a Nand internal
> interface.
> It always is called when application write to nand flash. (e.g. dd)
> In this function, partial page write is dealt with by filling '0xff' to
> buffer before data copy.
> (nand_do_write_oob() is similar)
> So I don't think we need to do it in our controller driver again, it
> should be a job of upper layer.

If this is to be considered part of the interface contract, then perhaps
do a WARN_ON() if we see an unexpected index/column?  And after that,
only consider full-page or full-oob possibilities.

-Scott

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