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authorWu, Josh <Josh.wu@atmel.com>2014-07-01 19:30:13 +0800
committerTom Rini <trini@ti.com>2014-07-07 19:43:01 -0400
commitbd83b5921201a61eb74ed7faa04c3f237d5323a2 (patch)
tree0f3a924e4cbb4fc7be45d8bcb4de8dda3d72ed71 /README
parentbe354c1a214daeedb24d7716308432f188d0004c (diff)
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README: document CONFIG_ENV_IS_IN_SPI_FLASH
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> Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
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--- a/README
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@@ -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