Date: Tue, 7 Apr 2009 01:07:44 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Sneha Narnakaje <nsnehaprabha@ti.com>
cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
       davinci-linux-open-source@linux.davincidsp.com,
       Sandeep Paulraj <s-paulraj@ti.com>
Subject: Re: [PATCH] MTD-NAND: Changes to read_page APIs to support
 NAND_ECC_HW_SYNDROME mode on TI DaVinci DM355
In-Reply-To: <1238601784-9563-1-git-send-email-nsnehaprabha@ti.com>
Message-ID: <alpine.LFD.2.00.0904070102260.21577@localhost.localdomain>
References: <1238601784-9563-1-git-send-email-nsnehaprabha@ti.com>
User-Agent: Alpine 2.00 (LFD 1167 2008-08-23)
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
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Lines: 24

Sneha,

On Wed, 1 Apr 2009, nsnehaprabha@ti.com wrote:

Would you please care to CC the still caring but admittedly lazy and
distracted maintainer on such patches ?

> From: Sneha Narnakaje <nsnehaprabha@ti.com>
> 
> The NAND controller on TI DaVinci DM355 supports NAND devices with large page size (2K and 4K), but the HW ECC is handled for every 512byte read/write chunks. The current HW_SYNDROME read_page/write_page APIs in the NAND core (nand_base) use the "infix OOB" scheme. The core APIs overwrite NAND manufacturer's bad block meta data, thus complicating the jobs of non-Linux NAND programmers (end equipment manufacturering). These APIs also imply ECC protection for the prepad bytes, causing nand raw_write operations to fail.

Please use proper line breaks. 523 characters do not fit into a
terminal.

Thanks,

	tglx


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