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-at91/armv7/Makefile

@@ -0,0 +1,17 @@
+#
+# (C) Copyright 2000-2008
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2013
+# Bo Shen <voice.shen@atmel.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_SAMA5D2)	+= sama5d2_devices.o
+obj-$(CONFIG_SAMA5D3)	+= sama5d3_devices.o
+obj-$(CONFIG_SAMA5D4)	+= sama5d4_devices.o
+obj-y += clock.o
+obj-y += cpu.o
+obj-y += reset.o
+obj-y += timer.o