avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/net/ping.h

@@ -0,0 +1,32 @@
+/*
+ *	Copied from Linux Monitor (LiMon) - Networking.
+ *
+ *	Copyright 1994 - 2000 Neil Russell.
+ *	(See License)
+ *	Copyright 2000 Roland Borde
+ *	Copyright 2000 Paolo Scaffardi
+ *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
+ *	SPDX-License-Identifier:	GPL-2.0
+ */
+
+#ifndef __PING_H__
+#define __PING_H__
+
+#include <common.h>
+#include <net.h>
+
+/*
+ * Initialize ping (beginning of netloop)
+ */
+void ping_start(void);
+
+/*
+ * Deal with the receipt of a ping packet
+ *
+ * @param et Ethernet header in packet
+ * @param ip IP header in the same packet
+ * @param len Packet length
+ */
+void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len);
+
+#endif /* __PING_H__ */