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/tools/gen_eth_addr.c

@@ -0,0 +1,34 @@
+/*
+ * (C) Copyright 2001
+ * Murray Jensen <Murray.Jensen@cmst.csiro.au>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+
+int
+main(int argc, char *argv[])
+{
+    unsigned long ethaddr_low, ethaddr_high;
+
+    srand(time(0) + (getpid() << 8));
+
+    /*
+     * setting the 2nd LSB in the most significant byte of
+     * the address makes it a locally administered ethernet
+     * address
+     */
+    ethaddr_high = (rand() & 0xfeff) | 0x0200;
+    ethaddr_low = rand();
+
+    printf("%02lx:%02lx:%02lx:%02lx:%02lx:%02lx\n",
+	ethaddr_high >> 8, ethaddr_high & 0xff,
+	ethaddr_low >> 24, (ethaddr_low >> 16) & 0xff,
+	(ethaddr_low >> 8) & 0xff, ethaddr_low & 0xff);
+
+    return (0);
+}