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-orion5x/Makefile

@@ -0,0 +1,28 @@
+#
+# Copyright (C) 2010 Albert ARIBAUD <albert.u.boot@aribaud.net>
+#
+# Based on original Kirkwood support which is
+# (C) Copyright 2009
+# Marvell Semiconductor <www.marvell.com>
+# Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	= cpu.o
+obj-y	+= dram.o
+obj-y	+= timer.o
+
+ifndef CONFIG_SKIP_LOWLEVEL_INIT
+obj-y	+= lowlevel_init.o
+endif
+
+# some files can only build in ARM or THUMB2, not THUMB1
+
+ifdef CONFIG_SYS_THUMB_BUILD
+ifndef CONFIG_HAS_THUMB2
+
+CFLAGS_cpu.o := -marm
+
+endif
+endif