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/blackfin/lib/Makefile

@@ -0,0 +1,27 @@
+#
+# U-Boot Makefile
+#
+# Copyright (c) 2005-2008 Analog Devices Inc.
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	+= ins.o
+obj-y	+= memcmp.o
+obj-y	+= memcpy.o
+obj-y	+= memmove.o
+obj-y	+= memset.o
+obj-y	+= outs.o
+obj-$(CONFIG_CMD_KGDB) += __kgdb.o
+obj-y	+= boot.o
+obj-y	+= cache.o
+obj-y	+= clocks.o
+obj-$(CONFIG_CMD_CACHE_DUMP) += cmd_cache_dump.o
+obj-$(CONFIG_CMD_KGDB) += kgdb.o
+obj-y	+= muldi3.o
+obj-$(CONFIG_HAS_POST) += post.o
+obj-y	+= string.o
+obj-y	+= sections.o