[U-Boot] [PATCH v2 2/4] am33xx: add CONFIG_SYS_NAND_DEVICE_WIDTH to determine NAND device bus-width

[Scott Wood]

On Mon, 2013-09-30 at 23:52 +0530, Pekon Gupta wrote:
> +#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SYS_NAND_ONFI_DETECTION)
> +	/* device bus-width determined from ONFI params */
> +	nand->options	&= ~NAND_BUSWIDTH_16;
> +#else
> +	/* device bus-width passed via CONFIG_xx */
> +	if (CONFIG_SYS_NAND_DEVICE_WIDTH == 16)
> +		nand->options |= NAND_BUSWIDTH_16;
> +	else
> +		nand->options &= ~NAND_BUSWIDTH_16;
> +#endif

BTW, CONFIG_SYS_NAND_ONFI_DETECTION is misnamed -- it should be
CONFIG_NAND_ONFI_DETECTION and it should only indicate whether we're
building ONFI support, rather than making an assertion about whether the
device actually is ONFI.  You could do what the Linux driver does, and
retry as 16-bit if an 8-bit ident fails.

-Scott