SAUCE: OMAP4 Make pxe boot fallback default boot

If there is no boot.scr nor uEnv.txt nor uImage then fallback to pxe.

BugLink: https://bugs.launchpad.net/bugs/820121
BugLink: https://bugs.launchpad.net/bugs/826877

Signed-off-by: John Rigby <john.rigby@linaro.org>
diff --git a/include/configs/omap4_common.h b/include/configs/omap4_common.h
index 2469ba5..7008fe6 100644
--- a/include/configs/omap4_common.h
+++ b/include/configs/omap4_common.h
@@ -176,6 +176,12 @@
 				"run mmcboot; " \
 			"fi; " \
 		"fi; " \
+	"fi; " \
+	"if usb start; then " \
+		"set autoload no; "\
+		"bootp; "\
+		"pxe get;" \
+		"pxe boot;" \
 	"fi"
 
 #define CONFIG_AUTO_COMPLETE		1