linux-kernel - Re: [PATCH RFC v4 3/4] nand: pl353: Add ONDIE ECC support

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Date:	Thu, 31 Jul 2014 00:23:17 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rob@...dley.net, michal.simek@...inx.com, grant.likely@...aro.org,
	gregkh@...uxfoundation.org, jason@...edaemon.net,
	ezequiel.garcia@...e-electrons.com, arnd@...db.de,
	dwmw2@...radead.org, artem.bityutskiy@...ux.intel.com,
	pekon@...com, jussi.kivilinna@....fi, acourbot@...dia.com,
	ivan.khoronzhuk@...com, joern@...fs.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	kpc528@...il.com, kalluripunnaiahchoudary@...il.com,
	anirudh@...inx.com, svemula@...inx.com,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>
Subject: Re: [PATCH RFC v4 3/4] nand: pl353: Add ONDIE ECC support

On Thu, Jul 31, 2014 at 12:06:43AM -0700, Brian Norris wrote:
> On Mon, Jul 28, 2014 at 09:01:39PM +0530, Punnaiah Choudary Kalluri wrote:
> > +/* Generic flash bbt decriptors */
> > +static uint8_t bbt_pattern[] = { 'B', 'b', 't', '0' };
> > +static uint8_t mirror_pattern[] = { '1', 't', 'b', 'B' };
> > +
> > +static struct nand_bbt_descr bbt_main_descr = {
> > +	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
> > +		| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
> > +	.offs = 4,
> > +	.len = 4,
> > +	.veroffs = 20,
> > +	.maxblocks = 4,
> > +	.pattern = bbt_pattern
> > +};
> > +
> > +static struct nand_bbt_descr bbt_mirror_descr = {
> > +	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
> > +		| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
> > +	.offs = 4,
> > +	.len = 4,
> > +	.veroffs = 20,
> > +	.maxblocks = 4,
> > +	.pattern = mirror_pattern
> > +};
> 
> Why do you need a custom BBT descriptor? It's much better to use the
> standard ones. Perhaps you just want the NAND_BBT_NO_OOB_BBM option, so
> you get the bbt_{main,mirror}_no_oob_descr structs from nand_bbt.c.

I see you answered this:

 http://lists.infradead.org/pipermail/linux-mtd/2014-April/053451.html

That's unfortunate.

Brian
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