mmc: at91sam9x5: support to save environment in mmc

Signed-off-by: NJosh Wu <josh.wu@atmel.com>
Acked-by: NAndreas Bießmann <andreas.devel@googlemail.com>
Signed-off-by: NAndy Fleming <afleming@freescale.com>

boards.cfg

@@ -98,6 +98,7 @@ at91sam9rlek_dataflash       arm         arm926ejs   at91sam9rlek        atmel
 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_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
 at91sam9xeek_dataflash_cs1   arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9XE,SYS_USE_DATAFLASH_CS1
 at91sam9xeek_nandflash       arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9XE,SYS_USE_NANDFLASH

include/configs/at91sam9x5ek.h

@@ -168,8 +168,7 @@
 #define CONFIG_BOOTCOMMAND	"nand read " \
 				"0x22000000 0x200000 0x300000; " \
 				"bootm 0x22000000"
-#else
-#ifdef CONFIG_SYS_USE_SPIFLASH
+#elif defined(CONFIG_SYS_USE_SPIFLASH)
 /* bootstrap + u-boot + env + linux in spi flash */
 #define CONFIG_ENV_IS_IN_SPI_FLASH
 #define CONFIG_ENV_OFFSET	0x5000
@@ -179,14 +178,28 @@
 #define CONFIG_BOOTCOMMAND	"sf probe 0; " \
 				"sf read 0x22000000 0x100000 0x300000; " \
 				"bootm 0x22000000"
-#endif
+#else /* CONFIG_SYS_USE_MMC */
+/* bootstrap + u-boot + env + linux in mmc */
+#define CONFIG_ENV_IS_IN_MMC
+/* For FAT system, most cases it should be in the reserved sector */
+#define CONFIG_ENV_OFFSET	0x2000
+#define CONFIG_ENV_SIZE		0x1000
+#define CONFIG_SYS_MMC_ENV_DEV	0
 #endif
 
+#ifdef CONFIG_SYS_USE_MMC
+#define CONFIG_BOOTARGS		"mem=128M console=ttyS0,115200 " \
+				"mtdparts=atmel_nand:" \
+				"8M(bootstrap/uboot/kernel)ro,-(rootfs) " \
+				"root=/dev/mmcblk0p2 " \
+				"rw rootfstype=ext4 rootwait"
+#else
 #define CONFIG_BOOTARGS		"mem=128M console=ttyS0,115200 " \
 				"mtdparts=atmel_nand:" \
 				"8M(bootstrap/uboot/kernel)ro,-(rootfs) " \
 				"root=/dev/mtdblock1 rw " \
 				"rootfstype=ubifs ubi.mtd=1 root=ubi0:rootfs"
+#endif
 
 #define CONFIG_BAUDRATE		115200