omap5: Add netargs and netboot option

* Add netargs and netboot option.
* This enables tftp and nfs booting
* This puts omap5 devices inline with other devices such as am335x and am437x

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>

include/configs/ti_omap5_common.h

@@ -85,10 +85,16 @@
 		"vram=${vram} " \
 		"root=${mmcroot} " \
 		"rootfstype=${mmcrootfstype}\0" \
+	"netargs=setenv bootargs console=${console} " \
+		"${optargs} " \
+		"root=/dev/nfs " \
+		"nfsroot=${serverip}:${rootpath},${nfsopts} rw " \
+		"ip=dhcp\0" \
 	"loadbootscript=fatload mmc ${mmcdev} ${loadaddr} boot.scr\0" \
 	"bootscript=echo Running bootscript from mmc${mmcdev} ...; " \
 		"source ${loadaddr}\0" \
-	"loadbootenv=fatload mmc ${mmcdev} ${loadaddr} uEnv.txt\0" \
+	"bootenv=uEnv.txt\0" \
+	"loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
 	"importbootenv=echo Importing environment from mmc${mmcdev} ...; " \
 		"env import -t ${loadaddr} ${filesize}\0" \
 	"loadimage=load mmc ${bootpart} ${loadaddr} ${bootdir}/${bootfile}\0" \
@@ -110,6 +116,13 @@
 				"bootz ${loadaddr} - ${fdtaddr}; " \
 			"fi;" \
 		"fi;\0" \
+	"netboot=echo Booting from network ...; " \
+		"set env autoload no; " \
+		"dhcp; " \
+		"tftp ${loadaddr} ${bootfile}; " \
+		"tftp ${fdtaddr} ${fdtfile}; " \
+		"run netargs; " \
+		"bootz ${loadaddr} - ${fdtaddr}\0" \
 	"findfdt="\
 		"if test $board_name = omap5_uevm; then " \
 			"setenv fdtfile omap5-uevm.dtb; fi; " \