arm: at91sam9x5: add dataflash boot support

Add dataflash boot support on at91sam9x5ek board
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Andreas Bießmann <andreas.devel@googlemail.com>

boards.cfg

@@ -99,6 +99,7 @@ at91sam9m10g45ek_nandflash   arm         arm926ejs   at91sam9m10g45ek    atmel
 at91sam9rlek_dataflash       arm         arm926ejs   at91sam9rlek        atmel          at91        at91sam9rlek:AT91SAM9RL,SYS_USE_DATAFLASH
 at91sam9rlek_nandflash       arm         arm926ejs   at91sam9rlek        atmel          at91        at91sam9rlek:AT91SAM9RL,SYS_USE_NANDFLASH
 at91sam9x5ek_nandflash       arm         arm926ejs   at91sam9x5ek        atmel          at91        at91sam9x5ek:AT91SAM9X5,SYS_USE_NANDFLASH
+at91sam9x5ek_dataflash       arm         arm926ejs   at91sam9x5ek        atmel          at91        at91sam9x5ek:AT91SAM9X5,SYS_USE_DATAFLASH
 at91sam9x5ek_spiflash        arm         arm926ejs   at91sam9x5ek        atmel          at91        at91sam9x5ek:AT91SAM9X5,SYS_USE_SPIFLASH
 at91sam9x5ek_mmc             arm         arm926ejs   at91sam9x5ek        atmel          at91        at91sam9x5ek:AT91SAM9X5,SYS_USE_MMC
 at91sam9xeek_dataflash_cs0   arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9XE,SYS_USE_DATAFLASH_CS0

include/configs/at91sam9x5ek.h

@@ -205,6 +205,16 @@
 #define CONFIG_BOOTCOMMAND	"sf probe 0; " \
 				"sf read 0x22000000 0x100000 0x300000; " \
 				"bootm 0x22000000"
+#elif defined(CONFIG_SYS_USE_DATAFLASH)
+/* bootstrap + u-boot + env + linux in data flash */
+#define CONFIG_ENV_IS_IN_SPI_FLASH
+#define CONFIG_ENV_OFFSET	0x4200
+#define CONFIG_ENV_SIZE		0x4200
+#define CONFIG_ENV_SECT_SIZE	0x210
+#define CONFIG_ENV_SPI_MAX_HZ	30000000
+#define CONFIG_BOOTCOMMAND	"sf probe 0; " \
+				"sf read 0x22000000 0x84000 0x294000; " \
+				"bootm 0x22000000"
 #else /* CONFIG_SYS_USE_MMC */
 /* bootstrap + u-boot + env + linux in mmc */
 #define CONFIG_ENV_IS_IN_MMC