at91: Introduction of at91sam9g45 SOC.

AT91sam9g45 series is an ARM 926ej-s SOC family clocked at 400/133MHz.
It embeds USB high speed host and device, LCD, DDR2 RAM, and a full set of
peripherals.

The first board that embeds at91sam9g45 chip is the AT91SAM9G45-EKES.
On the board you can find 2 USART, USB high speed,
a 480*272 LG lcd, ethernet, gpio/joystick/buttons.

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
diff --git a/doc/README.at91 b/doc/README.at91
index 4a2c56b..269d072 100644
--- a/doc/README.at91
+++ b/doc/README.at91
@@ -75,6 +75,26 @@
 
 
 ------------------------------------------------------------------------------
+AT91SAM9M10G45EK
+------------------------------------------------------------------------------
+
+Memory map
+	0x20000000 - 23FFFFFF	SDRAM (64 MB)
+	0xC0000000 - Cxxxxxxx	Atmel Dataflash card (J12)
+
+Environment variables
+
+	U-Boot environment variables can be stored at different places:
+		- Dataflash on SPI chip select 0 (dataflash card)
+		- Nand flash.
+
+	You can choose your storage location at config step (here for at91sam9m10g45ek) :
+		make at91sam9m10g45ek_config			- use data flash (spi cs0) (default)
+		make at91sam9m10g45ek_nandflash_config		- use nand flash
+		make at91sam9m10g45ek_dataflash_cs0_config	- use data flash (spi cs0)
+
+
+------------------------------------------------------------------------------
 AT91SAM9RLEK
 ------------------------------------------------------------------------------