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/scripts/Makefile

@@ -0,0 +1,19 @@
+###
+# scripts contains sources for various helper programs used throughout
+# the kernel for the build process.
+# ---------------------------------------------------------------------------
+# docproc:       Used in Documentation/DocBook
+#
+# SPDX-License-Identifier:	GPL-2.0
+#
+
+# The following hostprogs-y programs are only build on demand
+hostprogs-y += docproc
+
+# These targets are used internally to avoid "is up to date" messages
+PHONY += build_docproc
+build_docproc: $(obj)/docproc
+	@:
+
+# Let clean descend into subdirs
+subdir-	+= basic kconfig