payloads/external: Add yabits payload

Yabits (Yet another UEFI bootloader) is designed to be a slim and quick
alternative to Tianocore.  It is still under heavy development.

https://web.archive.org/web/https://yabits.github.io/

Change-Id: I132970e952c605c73cfe33dc47f20170ae8aa899
Signed-off-by: Martin Roth <martin@coreboot.org>
Reviewed-on: https://review.coreboot.org/28590
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>

payloads/external/Yabits/Makefile

@@ -0,0 +1,69 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2016 Google Inc.
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+TAG-$(CONFIG_YABITS_MASTER)=origin/master
+NAME-$(CONFIG_YABITS_MASTER)=Master
+TAG-$(CONFIG_YABITS_STABLE)=d25abb067431dee9af9f8a874a209730ab7f0e91
+NAME-$(CONFIG_YABITS_STABLE)=Stable
+TAG-$(CONFIG_YABITS_REVISION)=$(CONFIG_YABITS_REVISION_ID)
+
+project_name=Yabits
+project_dir=$(CURDIR)/uefi
+project_git_repo=https://github.com/yabits/uefi.git
+LIBCONFIG_PATH="../../../libpayload"
+
+all: build
+
+$(project_dir):
+	echo "    Cloning $(project_name) from Git"
+	git clone $(project_git_repo) $(project_dir)
+
+fetch: $(project_dir)
+ifeq ($(TAG-y),)
+	echo "Error: The specified tag is invalid"
+ifeq ($(CONFIG_YABITS_REVISION),y)
+	echo "Error: There is no revision specified for $(project_name)"
+	false
+endif
+	false
+endif
+	-cd $(project_dir); git show $(TAG-y) >/dev/null 2>&1 ; \
+		if [ $$? -ne 0 ] || [ "$(TAG-y)" = "origin/master" ]; then \
+		echo "    Fetching new commits from the $(project_name) git repo"; \
+		git fetch; fi
+
+checkout: fetch
+	echo "    Checking out $(project_name) revision $(NAME-y) ($(TAG-y))"
+	cd $(project_dir); \
+		git checkout master; \
+		git branch -D coreboot 2>/dev/null; \
+		git checkout -b coreboot $(TAG-y)
+
+build: checkout
+	echo "    MAKE       $(project_name) $(NAME-y)"
+	$(if $(wildcard uefi/.xcompile),,$(shell bash ../../../util/xcompile/xcompile > uefi/.xcompile))
+	$(MAKE) -C $(project_dir) defconfig LIBCONFIG_PATH=$(LIBCONFIG_PATH) XGCC=$(XGCCPATH)
+	$(MAKE) -C $(project_dir) all LIBCONFIG_PATH=$(LIBCONFIG_PATH) XGCC=$(XGCCPATH)
+
+clean:
+	test -d $(project_dir) && $(MAKE) -C $(project_dir) clean LIBCONFIG_PATH=$(LIBCONFIG_PATH) XGCC=$(XGCCPATH) || exit 0
+
+distclean:
+	rm -rf $(project_dir)
+
+print-repo-info:
+	echo "$(project_git_repo) $(project_dir)"
+
+.PHONY: all build checkout clean distclean fetch print-repo-info