arm: at91: add at91sam9g20ek_mmc_config, which can save environment in mmc card

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

boards.cfg

@@ -94,6 +94,7 @@ at91sam9g10ek_dataflash_cs3  arm         arm926ejs   at91sam9261ek       atmel
 at91sam9g10ek_nandflash      arm         arm926ejs   at91sam9261ek       atmel          at91        at91sam9261ek:AT91SAM9G10,SYS_USE_NANDFLASH
 at91sam9g20ek_dataflash_cs0  arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9G20,SYS_USE_DATAFLASH_CS0
 at91sam9g20ek_dataflash_cs1  arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9G20,SYS_USE_DATAFLASH_CS1
+at91sam9g20ek_mmc            arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9G20,SYS_USE_MMC
 at91sam9g20ek_nandflash      arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9G20,SYS_USE_NANDFLASH
 at91sam9g20ek_2mmc_nandflash arm         arm926ejs   at91sam9260ek       atmel          at91        at91sam9260ek:AT91SAM9G20,AT91SAM9G20EK_2MMC,SYS_USE_NANDFLASH
 at91sam9m10g45ek_nandflash   arm         arm926ejs   at91sam9m10g45ek    atmel          at91        at91sam9m10g45ek:AT91SAM9M10G45,SYS_USE_NANDFLASH

include/configs/at91sam9260ek.h

@@ -223,7 +223,7 @@
 				"mtdparts=atmel_nand:-(root) "		\
 				"rw rootfstype=jffs2"
 
-#else /* CONFIG_SYS_USE_NANDFLASH */
+#elif defined(CONFIG_SYS_USE_NANDFLASH)
 
 /* bootstrap + u-boot + env + linux in nandflash */
 #define CONFIG_ENV_IS_IN_NAND	1
@@ -238,6 +238,22 @@
 	"512k(dtb),6M(kernel)ro,-(rootfs) "				\
 	"root=/dev/mtdblock7 rw rootfstype=jffs2"
 
+#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
+
+#define CONFIG_BOOTCOMMAND						\
+	"fatload mmc 0:1 0x22000000 uImage; bootm"
+#define CONFIG_BOOTARGS							\
+	"console=ttyS0,115200 earlyprintk "				\
+	"mtdparts=atmel_nand:256k(bootstrap)ro,512k(uboot)ro,"		\
+	"256k(env),256k(env_redundant),256k(spare),"			\
+	"512k(dtb),6M(kernel)ro,-(rootfs) "				\
+	"root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait"
 #endif
 
 #define CONFIG_SYS_PROMPT		"U-Boot> "