linux-kernel - Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip

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Date:	Mon, 28 Nov 2011 15:48:35 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	LiuShuo <b35362@...escale.com>
CC:	David Woodhouse <dwmw2@...radead.org>,
	<linux-mtd@...ts.infradead.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<leoli@...escale.com>, Artem Bityutskiy <dedekind1@...il.com>
Subject: Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support
 large-page Nand chip

On 11/23/2011 06:41 PM, b35362@...escale.com wrote:
> From: Liu Shuo <b35362@...escale.com>
> 
> Freescale FCM controller has a 2K size limitation of buffer RAM. In order
> to support the Nand flash chip whose page size is larger than 2K bytes,
> we read/write 2k data repeatedly by issuing FIR_OP_RB/FIR_OP_WB and save
> them to a large buffer.
> 
> Signed-off-by: Liu Shuo <b35362@...escale.com>
> Signed-off-by: Li Yang <leoli@...escale.com>
> ---
>  drivers/mtd/nand/fsl_elbc_nand.c |  211 +++++++++++++++++++++++++++++++++++---
>  1 files changed, 194 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
> index d634c5f..c96e714 100644
> --- a/drivers/mtd/nand/fsl_elbc_nand.c
> +++ b/drivers/mtd/nand/fsl_elbc_nand.c
> @@ -55,7 +55,9 @@ struct fsl_elbc_mtd {
>  	struct device *dev;
>  	int bank;               /* Chip select bank number           */
>  	u8 __iomem *vbase;      /* Chip select base virtual address  */
> -	int page_size;          /* NAND page size (0=512, 1=2048)    */
> +	int page_size;          /* NAND page size, the mutiple of 2048.
> +				 * (0=512, 1=2048, 2=4096, 4=8192....)
> +				 */

Again, please remove this.  It was sort-of reasonable when it was a
boolean that selected between slightly different programming models.  It
doesn't make sense as "mtd->writesize == 512 ? 0 : mtd->writesize / 512".

What is the plan for migrating bad block markers on first use?

-Scott

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