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-zynq/Makefile

@@ -0,0 +1,18 @@
+#
+# (C) Copyright 2000-2003
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2008
+# Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	:= timer.o
+obj-y	+= cpu.o
+obj-y	+= ddrc.o
+obj-y	+= slcr.o
+obj-y	+= clk.o
+obj-y	+= lowlevel_init.o
+AFLAGS_lowlevel_init.o := -mfpu=neon
+obj-$(CONFIG_SPL_BUILD)	+= spl.o