Radix cross Linux 3pp sources

diff --git a/hal/firmware/armbian-firmware/Makefile b/hal/firmware/armbian-firmware/Makefile
new file mode 100644
index 0000000..c3bd4ad
--- /dev/null
+++ b/hal/firmware/armbian-firmware/Makefile
@@ -0,0 +1,63 @@
+
+#
+# Armbian Firmware for the Linux Kernel: https://github.com/armbian/firmware.git
+#
+
+url        = https://github.com/armbian
+
+repo_name  = firmware
+
+#
+# List of tags to be extracted:
+# ============================
+#
+#                                               hash | version
+#            ----------------------------------------+--------------
+revisions  = 761658e1701c77a0a84706754e6db1a25ee60b82:20210505
+
+git_repo   = .git_clone
+
+pkgname    = armbian-firmware
+suffix     = tar.xz
+
+versions   = $(foreach tag, $(revisions), $(shell echo $(tag) | cut -f 2 -d ':'))
+tarballs   = $(addsuffix .$(suffix), $(addprefix $(pkgname)-, $(versions)))
+sha1s      = $(addsuffix .sha1sum, $(tarballs))
+
+TARGETS = repository_clean
+
+all: $(TARGETS)
+
+.PHONY: downloads_clean repository_clean
+
+$(git_repo):
+	@echo -e "\n======= Clone $(repo_name).git repository =======\n"
+	@rm -rf $(repo_name)
+	@git clone $(url)/$(repo_name).git $(repo_name)
+	@touch $@
+
+$(tarballs): $(git_repo)
+	@for revision in $(revisions) ; do \
+	  hash=`echo $$revision | cut -f 1 -d ':'` ; \
+	  date=`echo $$revision | cut -f 2 -d ':'` ; \
+	  if [ ! -f $(pkgname)-$$date.$(suffix) ]; then \
+	    echo -e "\n======= Creating '$(pkgname)-$$date.$(suffix)' snapshot =======" ; \
+	    ( cd $(repo_name) && \
+	      git archive --format=tar --prefix=$(pkgname)-$$date/ $$hash | \
+	      xz >../$(pkgname)-$$date.$(suffix) ) ; \
+	  fi ; \
+	done
+
+$(sha1s): %.$(suffix).sha1sum : %.$(suffix)
+	@for tarball in $< ; do \
+	  echo -e "\n======= Calculation the '$$tarball' sha1sum =======" ; \
+	  sha1sum --binary $$tarball > $$tarball.sha1sum ; \
+	done
+
+repository_clean: $(sha1s)
+	@echo -e "\n======= Remove cloned $(repo_name).git repository =======\n"
+	@rm -rf $(git_repo) $(repo_name)
+
+downloads_clean:
+	@rm -rf $(tarballs) $(sha1s)
+	@rm -rf $(git_repo) $(repo_name)