linux-kernel - Re: [PATCH] MTD-NAND: Changes to read_page APIs to support NAND_ECC_HW

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Date:	Tue, 7 Apr 2009 01:07:44 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Sneha Narnakaje <nsnehaprabha@...com>
cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	Sandeep Paulraj <s-paulraj@...com>
Subject: Re: [PATCH] MTD-NAND: Changes to read_page APIs to support
 NAND_ECC_HW_SYNDROME mode on TI DaVinci DM355

Sneha,

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

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

> From: Sneha Narnakaje <nsnehaprabha@...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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