linux-kernel - Re: [PATCH v4 11/11] mtd: nand: stm_nand_bch: provide ST's implementation of Bad Block Table

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Date:	Tue, 16 Dec 2014 14:49:42 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...inux.com, pekon@...-sem.com,
	linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v4 11/11] mtd: nand: stm_nand_bch: provide ST's
 implementation of Bad Block Table

On Wed, Nov 05, 2014 at 04:59:53PM +0000, Lee Jones wrote:
> This is the BBT format ST use internally.  It has to be used on boards
> which were flashed with or actively use ST's tooling and boards which
> are booted using ST's bootloaders.
> 
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mtd/nand/Kconfig        |   8 +
>  drivers/mtd/nand/Makefile       |   4 +-
>  drivers/mtd/nand/stm_nand_bbt.c | 619 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 630 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/mtd/nand/stm_nand_bbt.c
> 
> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> index 2738eec..040374d 100644
> --- a/drivers/mtd/nand/Kconfig
> +++ b/drivers/mtd/nand/Kconfig
> @@ -520,4 +520,12 @@ config MTD_NAND_STM_BCH
>  	help
>  	  Adds support for the STMicroelectronics NANDi BCH Controller.
>  
> +config MTD_NAND_STM_BCH_BBT
> +	bool "STMicroelectronics: NANDi BCH Controller Bad Block Table support"
> +	default y if MTD_NAND_STM_BCH=y || MTD_NAND_STM_BCH=m

This line could be simplified. But it's also weird now that you can
select CONFIG_MTD_NAND_STM_BCH_BBT, but that won't build the BBT code if
MTD_NAND_STM_BCH=n. So I'd suggest the following instead:

	depends on MTD_NAND_STM_BCH
	default y

Or maybe this could be more explicit about the default:

	depends on MTD_NAND_STM_BCH
	default MTD_NAND_STM_BCH

> +	help
> +	  Adds support for the STMicroelectronics Bad Block Table support.
> +	  If you are using a device which has has already been initialised
> +	  by ST or using their tooling/bootloaders, leave this enabled.
> +
>  endif # MTD_NAND
> diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
> index 6044e0a..e342c91 100644
> --- a/drivers/mtd/nand/Makefile
> +++ b/drivers/mtd/nand/Makefile
> @@ -41,7 +41,9 @@ obj-$(CONFIG_MTD_NAND_MLC_LPC32XX)      += lpc32xx_mlc.o
>  obj-$(CONFIG_MTD_NAND_SH_FLCTL)		+= sh_flctl.o
>  obj-$(CONFIG_MTD_NAND_MXC)		+= mxc_nand.o
>  obj-$(CONFIG_MTD_NAND_SOCRATES)		+= socrates_nand.o
> -obj-$(CONFIG_MTD_NAND_STM_BCH)		+= stm_nand_bch.o
> +obj-$(CONFIG_MTD_NAND_STM_BCH)		+= stm-nand.o
> +stm-nand-y				+= stm_nand_bch.o
> +stm-nand-$(CONFIG_MTD_NAND_STM_BCH_BBT)	+= stm_nand_bbt.o
>  obj-$(CONFIG_MTD_NAND_TXX9NDFMC)	+= txx9ndfmc.o
>  obj-$(CONFIG_MTD_NAND_NUC900)		+= nuc900_nand.o
>  obj-$(CONFIG_MTD_NAND_MPC5121_NFC)	+= mpc5121_nfc.o

[...]

Brian
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