[U-Boot] [PATCH] README: document CONFIG_ENV_IS_IN_SPI_FLASH

[Jagan Teki]

Thanks! for the document.

Reviewed-by: Jagannadha Sutradharudu Teki <jaganna at xilinx.com>

On Tue, Jul 1, 2014 at 5:00 PM, Josh Wu <josh.wu at atmel.com> wrote:
> The option can be used to save the environment in spi flash.
> Implementation code is already exist in command/env_sf.c. But
> the documentation is missing.
>
> This patch add the details for this option to the README file.
>
> Signed-off-by: Josh Wu <josh.wu at atmel.com>
> ---
>  README |   37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>
> diff --git a/README b/README
> index fe5cacb..794cfb0 100644
> --- a/README
> +++ b/README
> @@ -4069,6 +4069,43 @@ to save the current settings.
>           environment area within the total memory of your DataFlash placed
>           at the specified address.
>
> +- CONFIG_ENV_IS_IN_SPI_FLASH:
> +
> +       Define this if you have a SPI Flash memory device which you
> +       want to use for the environment.
> +
> +       - CONFIG_ENV_OFFSET:
> +       - CONFIG_ENV_SIZE:
> +
> +         These two #defines specify the offset and size of the
> +         environment area within the SPI Flash. CONFIG_ENV_OFFSET must be
> +         aligned to an erase sector boundary.
> +
> +       - CONFIG_ENV_SECT_SIZE:
> +
> +         Define the SPI flash's sector size.
> +
> +       - CONFIG_ENV_OFFSET_REDUND (optional):
> +
> +         This setting describes a second storage area of CONFIG_ENV_SIZE
> +         size used to hold a redundant copy of the environment data, so
> +         that there is a valid backup copy in case there is a power failure
> +         during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
> +         aligned to an erase sector boundary.
> +
> +       - CONFIG_ENV_SPI_BUS (optional):
> +       - CONFIG_ENV_SPI_CS (optional):
> +
> +         Define the SPI bus and chip select. If not defined they will be 0.
> +
> +       - CONFIG_ENV_SPI_MAX_HZ (optional):
> +
> +         Define the SPI max work clock. If not defined then use 1MHz.
> +
> +       - CONFIG_ENV_SPI_MODE (optional):
> +
> +         Define the SPI work mode. If not defined then use SPI_MODE_3.
> +
>  - CONFIG_ENV_IS_IN_REMOTE:
>
>         Define this if you have a remote memory space which you
> --
> 1.7.9.5
>
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-- 
Jagan.