+ 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. NAND partition table
+
+ All the board support boot from NAND flash will use the following NAND
+ partition table
+
+ 0x00000000 - 0x0003FFFF bootstrap (256 KiB)
+ 0x00040000 - 0x000BFFFF u-boot (512 KiB)
+ 0x000C0000 - 0x000FFFFF env (256 KiB)
+ 0x00100000 - 0x0013FFFF env_redundant (256 KiB)
+ 0x00140000 - 0x0017FFFF spare (256 KiB)
+ 0x00180000 - 0x001FFFFF dtb (512 KiB)
+ 0x00200000 - 0x007FFFFF kernel (6 MiB)
+ 0x00800000 - 0xxxxxxxxx rootfs (All left)
+
+III. Watchdog support
+
+ For security reasons, the at91 watchdog is running at boot time and,
+ if deactivated, cannot be used anymore.
+ If you want to use the watchdog, you will need to keep it running in
+ your code (make sure not to disable it in AT91Bootstrap for instance).
+
+ In the U-Boot configuration, the AT91 watchdog support is enabled using
+ the CONFIG_AT91SAM9_WATCHDOG and CONFIG_HW_WATCHDOG options.