modules-$(CONFIG_LINUXBOOT) += linuxboot

linuxboot_version := git
linuxboot_repo := https://github.com/osresearch/linuxboot
linuxboot_dir := linuxboot-$(linuxboot_version)


linuxboot_configure := \
	touch .config

# linuxboot builds are specialized on a per-target basis.
# They can be specialized by defining $(CONFIG_LINUXBOOT_BOARD)
# otherwise it is assumed that it will have the same name
# as the Heads BOARD.
linuxboot_board := $(or $(CONFIG_LINUXBOOT_BOARD),$(BOARD))

linuxboot_target := \
	BOARD=$(linuxboot_board) \
	KERNEL=$(build)/$(BOARD)/bzImage \
	INITRD=$(build)/$(BOARD)/initrd.cpio.xz \
	$(if $(CONFIG_LINUXBOOT_ROM), ROM=$(pwd)/$(CONFIG_LINUXBOOT_ROM)) \
	all

#
# Most mainboards will define a ROM file that contains the vendor ROM
# for the image.  Provide a reasonable error if the ROM file doesn't exist.
#
ifneq "$(CONFIG_LINUXBOOT_ROM)" ""
ifneq "y" "$(shell [ -r '$(CONFIG_LINUXBOOT_ROM)' ] && echo y)"
$(error $(CONFIG_LINUXBOOT_ROM): you must provide a ROM file)
endif

# Force a rebuild of the LinuxBoot ROM if the vendor ROM changes
linuxboot.intermediate:  $(CONFIG_LINUXBOOT_ROM)

endif

# The output file from the LinuxBoot build is a full ROM
# ready to flash onto the mainboard.  There might be partial
# firmware volumes as well, but that depends on the board
# so this only retrieves the final one
linuxboot_output := $(build)/$(linuxboot_dir)/build/$(linuxboot_board)/linuxboot.rom

$(linuxboot_output): linuxboot.intermediate

$(build)/$(BOARD)/linuxboot.rom: $(linuxboot_output)
	$(call do-copy,$<,$@)

# The Linux kernel and Heads initrd must be built before linuxboot
# unless the user has specified "FAST=1" on the make command line,
# which will assume that the kernel and initrd are fresh
ifneq "$(FAST)" "1"
linuxboot_depends := linux initrd
linuxboot.intermediate: $(build)/$(BOARD)/bzImage
linuxboot.intermediate: $(build)/$(BOARD)/initrd.cpio.xz
endif


linuxboot.run: $(build)/$(BOARD)/linuxboot.rom
	$(MAKE) -C $(build)/$(linuxboot_dir)  \
		BOARD:=$(linuxboot_board) \
		KERNEL=$(build)/$(BOARD)/bzImage \
		INITRD=$(build)/$(BOARD)/initrd.cpio.xz \
		run