linux-kernel - RE: [PATCH] mtd: nand: gpmi: add proper raw access support

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Date:	Mon, 29 Sep 2014 11:22:11 +1000
From:	Iwo Mergler <Iwo.Mergler@...commwireless.com>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Huang Shijie <shijie8@...il.com>
CC:	Mike Voytovich <mvoytovich@...pal.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Huang Shijie <b32955@...escale.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Roy Lee <roylee@...pal.com>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] mtd: nand: gpmi: add proper raw access support

On Thu, 11 Sep 2014 22:36:16 +1000
Boris BREZILLON <boris.brezillon@...e-electrons.com> wrote:
> 
> Well, I don't know about freescale specific tools, but at least I have
> an example with mtd_nandbiterrs module.
> This module is assuming it can write only the data part of a NAND page
> without modifying the OOB area (see [1]), which in GPMI controller
> case is impossible because raw write function store the data as if
> there were no specific scheme, while there is one:
> (metadata + n x (data_chunk + ECC bytes) + remaining_bytes).
> 

Hi Boris,


just as an aside, only the incremental bit errors test in nandbiterrs
positively requires raw data write.

The overwrite test (re-write the same page data repeatedly without
erase), only uses raw access because I was lazy. A normal ECC write
would do just as well.


Best regards,

Iwo

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