linux-kernel - Re: [ANNOUNCE] [PATCH] [MTD] Flex-OneNAND MTD Driver available.

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Message-Id: <1222417176.5012.17.camel@sauron>
Date:	Fri, 26 Sep 2008 11:19:36 +0300
From:	Artem Bityutskiy <dedekind@...radead.org>
To:	Amit Kumar Sharma <amitsharma.9@...sung.com>
Cc:	Kyungmin Park <kmpark@...radead.org>,
	apgmoorthy <moorthy.apg@...sung.com>,
	linux-mtd@...ts.infradead.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	lkml <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [ANNOUNCE] [PATCH] [MTD] Flex-OneNAND MTD Driver available.


On Fri, 2008-09-26 at 13:31 +0530, Amit Kumar Sharma wrote:
> Hi Artem
> 
> we have following erro message  if we maintain 64 bytes 
> eccpos.
> 
> /flash_eraseall -j /dev/mtd4
> ./flash_eraseall: /dev/mtd4: unable to get NAND oobinfo
> 
> ./nandwrite -j /dev/mtd2 /jffs2.img
> MEMSETOOBSEL: Inappropriate ioctl for device
> 
> but i think as OneNAND has hw ecc controller so Jffs2 will 
> not face any problem
> still i think mtd should consider for 128 bytes eccpos for 
> 4K page size.

Well, anyway, in Linux ABI is a holy cow, you cannot change it.
That is a tough rule. Old user-space binaries have to always
works.

Thus you may do one of:
1. Invent a new ioctl for 4KiB page NANDs
2. Add sysfs support
3. Just do not expose whole OOB as Kyungmin suggested

But I think assume dwmw2 would need to comment on this and
tell which approach would agree on.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

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