modules-$(CONFIG_COREBOOT) += coreboot

ifeq "$(CONFIG_COREBOOT_VERSION)" "4.8.1"
coreboot_version := 4.8.1
coreboot_hash := f0ddf4db0628c1fe1e8348c40084d9cbeb5771400c963fd419cda3995b69ad23
else
$(error "$(BOARD): does not specify coreboot version under CONFIG_COREBOOT_VERSION")
endif 

#coreboot_version := git
#coreboot_repo := https://github.com/osresearch/coreboot
coreboot_base_dir := coreboot-$(coreboot_version)
coreboot_dir := $(coreboot_base_dir)/$(BOARD)
coreboot_tar := coreboot-$(coreboot_version).tar.xz
coreboot_url := https://www.coreboot.org/releases/$(coreboot_tar)

# coreboot builds are specialized on a per-target basis.
# The builds are done in a per-target subdirectory
CONFIG_COREBOOT_CONFIG ?= config/coreboot-$(BOARD).config

# Ensure that touching the config file will force a rebuild
$(build)/$(coreboot_dir)/.configured: $(CONFIG_COREBOOT_CONFIG)

EXTRA_FLAGS := -fdebug-prefix-map=$(pwd)=heads -gno-record-gcc-switches -Wno-error=packed-not-aligned

coreboot_configure := \
	mkdir -p "$(build)/$(coreboot_dir)" \
	&& cp "$(pwd)/$(CONFIG_COREBOOT_CONFIG)" "$(build)/$(coreboot_dir)/.config" \
	&& $(MAKE) olddefconfig \
		-C "$(build)/$(coreboot_base_dir)" \
		obj="$(build)/$(coreboot_dir)" \
		DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
		BUILD_TIMELESS=1 \
		CFLAGS_x86_32="$(EXTRA_FLAGS)" \
		CFLAGS_x86_64="$(EXTRA_FLAGS)" \

COREBOOT_IASL="$(build)/$(coreboot_base_dir)/util/crossgcc/xgcc/bin/iasl"

# coreboot is built with the 32-bit compiler; ideally we could use the same
# x86_64-linux-musl -m32 to build it, but this causes some link errors that need
# to be tracked down.
#	CROSS="$(CROSS)" \

coreboot_target := \
	-C "$(build)/$(coreboot_base_dir)" \
	obj="$(build)/$(coreboot_dir)" \
	CROSS="$(dir $(CROSS))i386-linux-musl-" \
	IASL="$(COREBOOT_IASL)" \
	DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
	BUILD_TIMELESS=1 \
	CFLAGS_x86_32="$(EXTRA_FLAGS)" \
	CFLAGS_x86_64="$(EXTRA_FLAGS)" \
	$(MAKE_JOBS)

coreboot_output := coreboot.rom
coreboot_depend += linux initrd $(musl_dep)

$(build)/$(coreboot_dir)/.configured: $(COREBOOT_IASL)
$(COREBOOT_IASL): $(build)/$(coreboot_base_dir)/.canary
	$(MAKE) -C "$(build)/$(coreboot_base_dir)" CPUS=`nproc` iasl

# Force a rebuild if the inputs have changed
$(build)/$(coreboot_dir)/.build: \
	$(build)/$(BOARD)/bzImage \
	$(build)/$(BOARD)/initrd.cpio.xz \

# This produces a ROM image that is written with the flashrom program
$(build)/$(BOARD)/coreboot.rom: $(build)/$(coreboot_dir)/.build
	"$(build)/$(coreboot_dir)/cbfstool" "$(dir $<)coreboot.rom" print
	$(call do-copy,$(dir $<)coreboot.rom,$@)
	@touch $@   # update the time stamp

#
# Helpful target for reconfiguring the coreboot target
#
coreboot.menuconfig:
	$(MAKE) \
		-C "$(build)/$(coreboot_base_dir)" \
		DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
		menuconfig

# The config file in the repo is stored as a "defconfig" format
# which only includes the options that have changed from the defaults.
coreboot.saveconfig:
	$(MAKE) \
		-C "$(build)/$(coreboot_base_dir)" \
		DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
		DEFCONFIG="$(pwd)/$(CONFIG_COREBOOT_CONFIG)" \
		savedefconfig


# if we are not building from a git checkout,
# we must also download the coreboot-blobs tree
ifneq "$(coreboot_version)" "git"

coreboot_depends += coreboot-blobs
modules-y += coreboot-blobs

coreboot-blobs_version := $(coreboot_version)
coreboot-blobs_tar := coreboot-blobs-$(coreboot-blobs_version).tar.xz
coreboot-blobs_tar_opt := --strip 3
coreboot-blobs_dir := coreboot-$(coreboot-blobs_version)/3rdparty/blobs
coreboot-blobs_url := https://www.coreboot.org/releases/$(coreboot-blobs_tar)
coreboot-blobs_hash := 18aa509ae3af005a05d7b1e0b0246dc640249c14fc828f5144b6fd20bb10e295

## there is nothing to build for the blobs, this should be
## made easier to make happen
coreboot-blobs_output := .built
coreboot-blobs_configure := echo -e 'all:\n\ttouch .built' > Makefile

endif