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

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Message-ID: <7A436F7769CA33409C6B44B358BFFF0CFFAA8FCA@dlee02.ent.ti.com>
Date:	Tue, 7 Apr 2009 10:07:16 -0500
From:	"Narnakaje, Snehaprabha" <nsnehaprabha@...com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"Paulraj, Sandeep" <s-paulraj@...com>
Subject: RE: [PATCH] MTD-NAND: Changes to read_page APIs to support
 NAND_ECC_HW_SYNDROME mode on TI DaVinci DM355

Thomas,

> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@...utronix.de]
> Sent: Monday, April 06, 2009 7:08 PM
> To: Narnakaje, Snehaprabha
> Cc: linux-mtd@...ts.infradead.org; linux-kernel@...r.kernel.org; davinci-
> linux-open-source@...ux.davincidsp.com; Paulraj, Sandeep
> 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 ?

Who would that be?

Is the list below correct?

Steven J. Hill (sjhill@...litydiluted.com)
Thomas Gleixner (tglx@...uxtronix.de)
David Woodhouse (dwmw2@...radead.org)

> 
> > 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.

OK.

Thanks
Sneha
 
> 
> Thanks,
> 
> 	tglx
> 
> 

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