linux-kernel - RE: [PATCH 3/4] ARM: OMAP2: gpmc: Add support for BCH ECC scheme

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Message-ID: <518397C60809E147AF5323E0420B992E3E9D29C8@DBDE01.ent.ti.com>
Date:	Tue, 23 Oct 2012 10:18:02 +0000
From:	"Philip, Avinash" <avinashphilip@...com>
To:	Peter Korsgaard <jacmet@...site.dk>
CC:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"artem.bityutskiy@...ux.intel.com" <artem.bityutskiy@...ux.intel.com>,
	"tony@...mide.com" <tony@...mide.com>,
	"Mohammed, Afzal" <afzal@...com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"ivan.djelic@...rot.com" <ivan.djelic@...rot.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 3/4] ARM: OMAP2: gpmc: Add support for BCH ECC scheme

On Tue, Oct 16, 2012 at 00:18:30, Peter Korsgaard wrote:
> >>>>> Philip, Avinash <avinashphilip@...com> writes:
> 
>  > Add support for BCH ECC scheme to gpmc driver and also enabling multi
>  > sector read/write. This helps in doing single shot NAND page read and
>  > write.
> 
>  > ECC engine configurations
>  > BCH 4 bit support
>  > 1. write => ECC engine configured in wrap mode 6 and with ecc_size0 as 32.
>  > 2. read  => ECC engine configured in wrap mode 1 and with ecc_size0 as
>  > 13 and ecc_size1 as 1.
> 
>  > BCH 8 bit support
>  > 1. write => ECC engine configured in wrap mode 6 and with ecc_size0 as 32.
>  > 2. read  => ECC engine configured in wrap mode 1 and with ecc_size0 as
>  > 26 and ecc_size1 as 2.
> 
>  > Note: For BCH8 ECC bytes set to 14 to make compatible with RBL.
> 
> On what device? In the am335x TRM (spruh73f.pdf) figure 26-15 (pg 4273)
> the rom code is documented to not use any padding on the ECC bytes
> (E.G. oob 2..53):
> 
> http://www.ti.com/litv/pdf/spruh73f
> 
> I see the driver in the u-boot-am33x tree (ti81xx_nand.c) seems to use
> 4x14 bytes as well though, so perhaps that's a bug in the documentation
> instead?

Yes, RBL uses 4x14 bytes.

Thanks
Avinash

> 
> -- 
> Bye, Peter Korsgaard
> 

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