odroid: Add boot script (boot.scr) support

Add boot script (boot.scr) support. If no boot script are
found, it boots as usual.

Signed-off-by: Guillaume GARDET <guillaume.gardet@free.fr>
Tested-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

include/configs/odroid.h

@@ -108,6 +108,8 @@
  * 2.  ROOT:  -
 */
 #define CONFIG_EXTRA_ENV_SETTINGS \
+	"loadbootscript=load mmc ${mmcbootdev}:${mmcbootpart} ${scriptaddr} " \
+		"boot.scr\0" \
 	"loadkernel=load mmc ${mmcbootdev}:${mmcbootpart} ${kerneladdr} " \
 		"${kernelname}\0" \
 	"loadinitrd=load mmc ${mmcbootdev}:${mmcbootpart} ${initrdaddr} " \
@@ -129,6 +131,9 @@
 	"kernel_args=" \
 		"setenv bootargs root=/dev/mmcblk${mmcrootdev}p${mmcrootpart}" \
 		" rootwait ${console} ${opts}\0" \
+	"boot_script=" \
+		"run loadbootscript;" \
+		"source ${scriptaddr}\0" \
 	"boot_fit=" \
 		"setenv kerneladdr 0x42000000;" \
 		"setenv kernelname Image.itb;" \
@@ -152,7 +157,9 @@
 		"run kernel_args;" \
 		"bootz ${kerneladdr} ${initrd_addr} ${fdt_addr};\0" \
 	"autoboot=" \
-		"if test -e mmc 0 Image.itb; then; " \
+		"if test -e mmc 0 boot.scr; then; " \
+			"run boot_script; " \
+		"elif test -e mmc 0 Image.itb; then; " \
 			"run boot_fit;" \
 		"elif test -e mmc 0 zImage; then; " \
 			"run boot_zimg;" \
@@ -171,6 +178,7 @@
 	"consoleoff=set console console=ram; save; reset\0" \
 	"initrdname=uInitrd\0" \
 	"initrdaddr=42000000\0" \
+	"scriptaddr=0x42000000\0" \
 	"fdtaddr=40800000\0"
 
 /* I2C */