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

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Message-ID: <20140930100415.4834971d@bbrezillon>
Date:	Tue, 30 Sep 2014 10:04:15 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Iwo Mergler <Iwo.Mergler@...commwireless.com>
Cc:	Huang Shijie <shijie8@...il.com>,
	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

Hi Iwo,

On Mon, 29 Sep 2014 11:22:11 +1000
Iwo Mergler <Iwo.Mergler@...commwireless.com> wrote:

> 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.

Okay.
Anyway, the test I'm really interested in is the incremental bit errors
test :-).

BTW, any reason you chose to implement this test/testsuite as a
module ?
>From my understanding (and tell me if I'm wrong) we could do the same
from user-space.

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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