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/lib/physmem.c

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+#include <common.h>
+#include <physmem.h>
+#include <linux/compiler.h>
+
+phys_addr_t __weak arch_phys_memset(phys_addr_t s, int c, phys_size_t n)
+{
+	void *s_ptr = (void *)(uintptr_t)s;
+
+	assert(((phys_addr_t)(uintptr_t)s) == s);
+	assert(((phys_addr_t)(uintptr_t)(s + n)) == s + n);
+	return (phys_addr_t)(uintptr_t)memset(s_ptr, c, n);
+}