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/board/xilinx/zynq/Makefile

@@ -0,0 +1,29 @@
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	:= board.o
+
+hw-platform-y :=$(shell echo $(CONFIG_DEFAULT_DEVICE_TREE))
+
+init-objs := $(if $(wildcard $(srctree)/$(src)/$(hw-platform-y)/ps7_init_gpl.c),\
+	$(hw-platform-y)/ps7_init_gpl.o)
+
+ifeq ($(init-objs),)
+ifneq ($(wildcard $(srctree)/$(src)/ps7_init_gpl.c),)
+init-objs := ps7_init_gpl.o
+$(if $(CONFIG_SPL_BUILD),\
+$(warning Put custom ps7_init_gpl.c/h to board/xilinx/zynq/custom_hw_platform/))
+endif
+endif
+
+obj-$(CONFIG_SPL_BUILD) += $(init-objs)
+
+# Suppress "warning: function declaration isn't a prototype"
+CFLAGS_REMOVE_ps7_init_gpl.o := -Wstrict-prototypes
+
+# To include xil_io.h
+CFLAGS_ps7_init_gpl.o := -I$(srctree)/$(src)