am335x_evm: Add boot script support to am335x_evm

This patch adds boot script support to am335x_evm

Signed-off-by: Guillaume GARDET <guillaume.gardet@free.fr>
Cc: Tom Rini <trini@ti.com>

include/configs/am335x_evm.h

@@ -115,6 +115,9 @@
 		"nfsroot=${serverip}:${rootpath},${nfsopts} rw " \
 		"ip=dhcp\0" \
 	"bootenv=uEnv.txt\0" \
+	"loadbootscript=load mmc ${mmcdev} ${loadaddr} boot.scr\0" \
+	"bootscript=echo Running bootscript from mmc${mmcdev} ...; " \
+		"source ${loadaddr}\0" \
 	"loadbootenv=load mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
 	"importbootenv=echo Importing environment from mmc ...; " \
 		"env import -t -r $loadaddr $filesize\0" \
@@ -142,6 +145,9 @@
 	"mmcboot=mmc dev ${mmcdev}; " \
 		"if mmc rescan; then " \
 			"echo SD/MMC found on device ${mmcdev};" \
+			"if run loadbootscript; then " \
+				"run bootscript;" \
+			"else " \
 				"if run loadbootenv; then " \
 					"echo Loaded environment from ${bootenv};" \
 					"run importbootenv;" \
@@ -153,6 +159,7 @@
 				"if run loadimage; then " \
 					"run mmcloados;" \
 				"fi;" \
+			"fi ;" \
 		"fi;\0" \
 	"spiboot=echo Booting from spi ...; " \
 		"run spiargs; " \