board: amcore: add update scripts

Add some useful update scripts.
Signed-off-by: NAngelo Dureghello <angelo@sysam.it>
---
Changes for v.2:
- Fix syntax error on upgrade_jffs2 script

include/configs/amcore.h

 /*
  * Sysam AMCORE board configuration
  *
- * (C) Copyright 2015  Angelo Dureghello <angelo@sysam.it>
+ * (C) Copyright 2016  Angelo Dureghello <angelo@sysam.it>
  *
  * SPDX-License-Identifier:     GPL-2.0+
  */
@@ -19,6 +19,17 @@
 #define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }
 
 #define CONFIG_BOOTCOMMAND		"bootm ffc20000"
+#define CONFIG_EXTRA_ENV_SETTINGS				\
+	"upgrade_uboot=loady; "					\
+		"protect off 0xffc00000 0xffc1ffff; "		\
+		"erase 0xffc00000 0xffc1ffff; "			\
+		"cp.b 0x20000 0xffc00000 ${filesize}\0"		\
+	"upgrade_kernel=loady; "				\
+		"erase 0xffc20000 0xffefffff; "			\
+		"cp.b 0x20000 0xffc20000 ${filesize}\0"		\
+	"upgrade_jffs2=loady; "					\
+		"erase 0xfff00000 0xffffffff; "			\
+		"cp.b 0x20000 0xfff00000 ${filesize}\0"
 
 #undef CONFIG_CMD_AES
 #define CONFIG_CMD_DIAG