Support for redundant environment in NAND Flash.

[oweals/u-boot.git] / README

diff --git a/README b/README
index 6f610082224e54fc0a31246cdea7ad688df1e6d1..44421497beef778eebe3fb828571cd18dc5384f1 100644 (file)
--- a/README
+++ b/README
@@ -1946,6 +1946,17 @@ to save the current settings.
          These two #defines specify the offset and size of the environment
          area within the first NAND device.
 
+       - CFG_ENV_OFFSET_REDUND
+
+         This setting describes a second storage area of CFG_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.
+
+       Note: CFG_ENV_OFFSET and CFG_ENV_OFFSET_REDUND must be aligned
+       to a block boundary, and CFG_ENV_SIZE must be a multiple of
+       the NAND devices block size.
+
 - CFG_SPI_INIT_OFFSET
 
        Defines offset to the initial SPI buffer area in DPRAM. The