mx51evk: consolidate env for mmcboot and netboot

This patch is to consolidate default mx51evk env for two primary
boot modes, mmcboot and netboot.

It also cleans some unused env like netdev, uboot and redundant
env like loadaddr since CONFIG_LOADADDR already defines it.

Signed-off-by: Shawn Guo <shawn.gsc@gmail.com>

include/configs/mx51evk.h

@@ -125,18 +125,42 @@
 
 #define CONFIG_LOADADDR		0x90800000	/* loadaddr env var */
 
-#define	CONFIG_EXTRA_ENV_SETTINGS					\
-		"netdev=eth0\0"						\
-		"uboot_addr=0xa0000000\0"				\
-		"uboot=u-boot.bin\0"			\
-		"loadaddr=0x90800000\0"			\
-		"bootargs_base=setenv bootargs console=tty "\
-			"console=ttymxc0,${baudrate}\0"\
-		"bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs "\
-			"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0"\
-		"bootcmd=run bootcmd_net\0"				\
-		"bootcmd_net=run bootargs_base bootargs_nfs; "		\
-			"tftpboot ${loadaddr} ${kernel}; bootm\0"
+#define CONFIG_EXTRA_ENV_SETTINGS \
+	"script=boot.scr\0" \
+	"uimage=uImage\0" \
+	"mmcdev=0\0" \
+	"mmcpart=2\0" \
+	"mmcroot=/dev/mmcblk0p3 rw\0" \
+	"mmcrootfstype=ext3 rootwait\0" \
+	"mmcargs=setenv bootargs console=ttymxc0,${baudrate} " \
+		"root=${mmcroot} " \
+		"rootfstype=${mmcrootfstype}\0" \
+	"loadbootscript=" \
+		"fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};\0" \
+	"bootscript=echo Running bootscript from mmc ...; " \
+		"source\0" \
+	"loaduimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${uimage}\0" \
+	"mmcboot=echo Booting from mmc ...; " \
+		"run mmcargs; " \
+		"bootm\0" \
+	"netargs=setenv bootargs console=ttymxc0,${baudrate} " \
+		"root=/dev/nfs " \
+		"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0" \
+	"netboot=echo Booting from net ...; " \
+		"run netargs; " \
+		"dhcp ${uimage}; bootm\0" \
+
+#define CONFIG_BOOTCOMMAND \
+	"if mmc rescan ${mmcdev}; then " \
+		"if run loadbootscript; then " \
+			"run bootscript; " \
+		"else " \
+			"if run loaduimage; then " \
+				"run mmcboot; " \
+			"else run netboot; " \
+			"fi; " \
+		"fi; " \
+	"else run netboot; fi"
 
 #define CONFIG_ARP_TIMEOUT	200UL
 
@@ -144,6 +168,8 @@
  * Miscellaneous configurable options
  */
 #define CONFIG_SYS_LONGHELP		/* undef to save memory */
+#define CONFIG_SYS_HUSH_PARSER		/* use "hush" command parser */
+#define CONFIG_SYS_PROMPT_HUSH_PS2	"> "
 #define CONFIG_SYS_PROMPT		"MX51EVK U-Boot > "
 #define CONFIG_AUTO_COMPLETE
 #define CONFIG_SYS_CBSIZE		256	/* Console I/O Buffer Size */