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/arch/arm/mach-tegra/tegra20/crypto.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _CRYPTO_H_
+#define _CRYPTO_H_
+
+/**
+ * Sign a block of data
+ *
+ * \param source	Source data
+ * \param length	Size of source data
+ * \param signature	Destination address for signature, AES_KEY_LENGTH bytes
+ */
+int sign_data_block(u8 *source, unsigned length, u8 *signature);
+
+#endif /* #ifndef _CRYPTO_H_ */