configs: at91: at91sam9x5ek: fix bootcmd for NAND flash

The default bootcommand needs to be accurate w.r.t the nand memory map
at http://www.at91.com/linux4sam/bin/view/Linux4SAM/AT91sam9x5ekMainPage#NAND_Flash_demo_Memory_map

Updated to load kernel + dtb at right offsets and boot the zImage.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
diff --git a/include/configs/at91sam9x5ek.h b/include/configs/at91sam9x5ek.h
index d48b7d0..63305a7 100644
--- a/include/configs/at91sam9x5ek.h
+++ b/include/configs/at91sam9x5ek.h
@@ -85,8 +85,9 @@
 #define CONFIG_ENV_OFFSET_REDUND	0x100000
 #define CONFIG_ENV_SIZE		0x20000		/* 1 sector = 128 kB */
 #define CONFIG_BOOTCOMMAND	"nand read " \
-				"0x22000000 0x200000 0x300000; " \
-				"bootm 0x22000000"
+				"0x22000000 0x200000 0x600000; " \
+				"nand read 0x21000000 0x180000 0x20000; " \
+				"bootz 0x22000000 - 0x21000000"
 #elif defined(CONFIG_SPI_BOOT)
 /* bootstrap + u-boot + env + linux in spi flash */
 #define CONFIG_ENV_OFFSET	0x5000