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@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