igep003x: Add netboot support

netboot allows to boot an external image using TFTP and NFS protocols

Signed-off-by: Pau Pajuelo <ppajuelo@iseebcn.com>
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Tested-by: Pau Pajuelo <ppajuel@gmail.com>

include/configs/am335x_igep003x.h

@@ -79,6 +79,16 @@
 		"run nandargs; " \
 		"run nandload; " \
 		"bootz ${loadaddr} - ${fdtaddr} \0" \
+	"netload=tftpboot ${loadaddr} ${bootfile}; " \
+		"tftpboot ${fdtaddr} ${fdtfile} \0" \
+	"netargs=setenv bootargs console=${console} " \
+		"${optargs} " \
+		"root=/dev/nfs " \
+		"ip=${ipaddr} nfsroot=${serverip}:${rootnfs},v3,tcp \0" \
+	"netboot=echo Booting from net ...; " \
+		"run netargs; " \
+		"run netload; " \
+		"bootz ${loadaddr} - ${fdtaddr} \0" \
 	"findfdt="\
 		"if test ${board_name} = igep0033; then " \
 			"setenv fdtfile am335x-igep-base0033.dtb; fi; " \
@@ -93,7 +103,8 @@
 #define CONFIG_BOOTCOMMAND \
 	"run findfdt;" \
 	"run mmcboot;" \
-	"run nandboot;"
+	"run nandboot;" \
+	"run netboot;"
 
 /* NS16550 Configuration */
 #define CONFIG_SYS_NS16550_COM1		0x44e09000	/* UART0 */