CROSS_COMPILE	?= arm-none-eabi-
PATCHDIR	:= /proj/fairbanks_lx/users/coresw/linux-next-patches
build_dir       := $(CURDIR)/build-u300
output_dir	:= $(HOME)
rootfs		:= $(PATCHDIR)/rootfs-u338.cpio
install_dir     := $(build_dir)/install
config_file     := $(build_dir)/.config
strip		:= $(CROSS_COMPILE)strip
objcopy		:= $(CROSS_COMPILE)objcopy

ARCH ?= arm

make_options := -f Makefile \
                ARCH=$(ARCH) \
                CROSS_COMPILE=$(CROSS_COMPILE) \
                KBUILD_OUTPUT=$(build_dir)

.PHONY: help
help:
	@echo "****  Common Makefile  ****"
	@echo "make config [PLATFORM=foo] - configure for platform \"foo\""
	@echo "make build - build the kernel and produce a RAMdisk image"
	@echo
	@echo "example:"
	@echo "make -f u300.mak config"
	@echo "make -f u300.mak build"

.PHONY: have-rootfs
have-rootfs:
	@if [ ! -f $(rootfs) ] ; then \
	     echo "ERROR: no rootfs at $(rootfs)" ; \
	     echo "This is needed to boot the system." ; \
	     echo "ABORTING." ; \
	     exit 1 ; \
	else \
	     echo "Rootfs available at $(rootfs)" ; \
	fi

.PHONY: have-crosscompiler
have-crosscompiler:
	@echo -n "Check that $(CROSS_COMPILE)gcc is available..."
	@which $(CROSS_COMPILE)gcc > /dev/null ; \
	if [ ! $$? -eq 0 ] ; then \
	   echo "ERROR: cross-compiler $(CROSS_COMPILE)gcc not in PATH=$$PATH!" ; \
	   echo "ABORTING." ; \
	   exit 1 ; \
	else \
	   echo "OK" ;\
	fi


config: have-rootfs FORCE
	@mkdir -p $(build_dir)
	@cp $(rootfs) $(build_dir)
	$(MAKE) $(make_options) u300_defconfig
	# Reconfigure a bit
	$(CURDIR)/scripts/config --file $(build_dir)/.config \
	--enable BLK_DEV_INITRD \
	--set-str INITRAMFS_SOURCE rootfs-u338.cpio \
	--enable RD_GZIP \
	--enable INITRAMFS_COMPRESSION_NONE \
	--enable DEBUG_FS \
	--disable MMC_DEBUG
	yes "" | make $(make_options) oldconfig

menuconfig: FORCE
	$(MAKE) $(make_options) menuconfig

build: have-rootfs have-crosscompiler FORCE
	$(MAKE) $(make_options) -j 4 vmlinux CONFIG_DEBUG_SECTION_MISMATCH=y
	# $(MAKE) $(make_options) -j 4 modules
	# Copy to output dir
	cp -f $(build_dir)/vmlinux $(output_dir)/vmlinux.debug
	$(strip) -o $(output_dir)/vmlinux.stripped $(output_dir)/vmlinux.debug
	$(objcopy) -O binary -R .note -R .comment -R .note.gnu.build-id -S \
		   $(output_dir)/vmlinux.stripped $(output_dir)/vmlinux.bin

regressiontest: config
	$(MAKE) $(make_options) realview_defconfig
	$(MAKE) $(make_options) -j 4 vmlinux CONFIG_DEBUG_SECTION_MISMATCH=y
	$(MAKE) $(make_options) -j 4 modules
	$(MAKE) $(make_options) versatile_defconfig
	$(MAKE) $(make_options) -j 4 vmlinux CONFIG_DEBUG_SECTION_MISMATCH=y
	$(MAKE) $(make_options) -j 4 modules
	$(MAKE) $(make_options) integrator_defconfig
	$(MAKE) $(make_options) -j 4 vmlinux CONFIG_DEBUG_SECTION_MISMATCH=y
	$(MAKE) $(make_options) -j 4 modules

TAGS: FORCE
	$(MAKE) $(make_options) TAGS

clean:
	$(MAKE) -f Makefile clean
	rm -f $(module_files)
	rm -rf build

# Rules without commands or prerequisites that do not match a file name
# are considered to always change when make runs. This means that any rule
# that depends on FORCE will always be remade also.
FORCE: