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/net_rand.h

@@ -0,0 +1,43 @@
+/*
+ *	Copied from LiMon - BOOTP.
+ *
+ *	Copyright 1994, 1995, 2000 Neil Russell.
+ *	(See License)
+ *	Copyright 2000 Paolo Scaffardi
+ */
+
+#ifndef __NET_RAND_H__
+#define __NET_RAND_H__
+
+#include <common.h>
+
+/*
+ * Return a seed for the PRNG derived from the eth0 MAC address.
+ */
+static inline unsigned int seed_mac(void)
+{
+	unsigned char enetaddr[6];
+	unsigned int seed;
+
+	/* get our mac */
+	eth_getenv_enetaddr("ethaddr", enetaddr);
+
+	seed = enetaddr[5];
+	seed ^= enetaddr[4] << 8;
+	seed ^= enetaddr[3] << 16;
+	seed ^= enetaddr[2] << 24;
+	seed ^= enetaddr[1];
+	seed ^= enetaddr[0] << 8;
+
+	return seed;
+}
+
+/*
+ * Seed the random number generator using the eth0 MAC address.
+ */
+static inline void srand_mac(void)
+{
+	srand(seed_mac());
+}
+
+#endif /* __NET_RAND_H__ */