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-rw-r--r--doc/README.at9142
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diff --git a/doc/README.at91 b/doc/README.at91
index b3d110b..5cf9770 100644
--- a/doc/README.at91
+++ b/doc/README.at91
@@ -102,6 +102,48 @@ Environment variables
You can choose your storage location at config step (here for at91sam9rlek) :
make at91sam9rlek_nandflash_config - use nand flash
+
+------------------------------------------------------------------------------
+AT91SAM9N12EK, AT91SAM9X5EK
+------------------------------------------------------------------------------
+
+Memory map
+ 0x20000000 - 27FFFFFF SDRAM (128 MB)
+
+Environment variables
+
+ U-Boot environment variables can be stored at different places:
+ - Nand flash.
+ - SD/MMC card
+ - Serialflash/Dataflash on SPI chip select 0
+
+ You can choose your storage location at config step (here for at91sam9x5ek) :
+ make at91sam9x5ek_dataflash_config - use data flash
+ make at91sam9x5ek_mmc_config - use sd/mmc card
+ make at91sam9x5ek_nandflash_config - use nand flash
+ make at91sam9x5ek_spiflash_config - use serial flash
+
+
+------------------------------------------------------------------------------
+SAMA5D3XEK
+------------------------------------------------------------------------------
+
+Memory map
+ 0x20000000 - 3FFFFFFF SDRAM (512 MB)
+
+Environment variables
+
+ U-Boot environment variables can be stored at different places:
+ - Nand flash.
+ - SD/MMC card
+ - Serialflash on SPI chip select 0
+
+ You can choose your storage location at config step (here for sama5d3xek) :
+ make sama5d3xek_mmc_config - use SD/MMC card
+ make sama5d3xek_nandflash_config - use nand flash
+ make sama5d3xek_serialflash_config - use serial flash
+
+
II. Watchdog support
For security reasons, the at91 watchdog is running at boot time and,