build almost works

Makefile

@@ -1,20 +1,24 @@
-all: linux kexec busybox initrd coreboot
+all: coreboot
 
 
 kexec_version := 2.0.12
+kexec_dir := kexec-tools-$(kexec_version)
 kexec_tar := kexec-tools-$(kexec_version).tar.gz
 kexec_url := https://kernel.org/pub/linux/utils/kernel/kexec/$(kexec_tar)
 kexec_hash := cc7b60dad0da202004048a6179d8a53606943062dd627a2edba45a8ea3a85135
 
-kexec: $(kexec_tar)
-	tar xvf "$(kexec_tar)"
-	cd "$(kexec_dir)" && ./configure && make
-
 $(kexec_tar):
 	wget "$(kexec_url)"
 	sha256sum "$(kexec_tar)"
 	echo "$(kexec_hash)"
 
+$(kexec_dir): $(kexec_tar)
+	tar xvf "$(kexec_tar)"
+	cd "$(kexec_dir)" && ./configure
+
+kexec: $(kexec_dir)
+	make -C "$(kexec_dir)" -j 8
+
 
 busybox_version := 1.25.0
 busybox_dir := busybox-$(busybox_version)
@@ -23,10 +27,15 @@ busybox_url := https://busybox.net/downloads/$(busybox_tar)
 busybox_hash := 5a0fe06885ee1b805fb459ab6aaa023fe4f2eccee4fb8c0fd9a6c17c0daca2fc
 busybox_config := config/busybox.config
 
-busybox: $(busybox_tar) $(busybox_config)
+busybox: $(busybox_dir) $(busybox_dir)/.config
+	make -C "$(busybox_dir)" -j 8
+
+$(busybox_dir): $(busybox_tar)
 	tar xvf "$(busybox_tar)"
-	cp "$(busybox_config)" "$(busybox_dir)/.config"
-	cd "$(busybox_dir)" && make oldconfig && make -j 8
+
+$(busybox_dir)/.config: $(busybox_config)
+	cp "$<" "$@"
+	make -C "$(busybox_dir)" oldconfig
 
 $(busybox_tar):
 	wget "$(busybox_url)"
@@ -36,12 +45,114 @@ $(busybox_tar):
 
 linux_version := 4.6.4
 linux_dir := linux-$(linux_version)
-linux_tar := linux-$(linux_version).tar.bz2
-linux_url := https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-$(linux_version).tar.xz
+linux_tar := linux-$(linux_version).tar.xz
+linux_url := https://cdn.kernel.org/pub/linux/kernel/v4.x/$(linux_tar)
 linux_hash := 8568d41c7104e941989b14a380d167129f83db42c04e950d8d9337fe6012ff7e
 linux_config := config/linux.config
 
-linux: $(linux_tar) $(linux_config)
+$(linux_dir): $(linux_tar)
 	tar xvf "$(linux_tar)"
-	cp "$(linux_config)" "$(linux_dir)/.config"
-	cd "$(linux_dir)" && make oldconfig && make -j 8 && make bzImage
+
+$(linux_dir)/.config: $(linux_config)
+	cp "$<" "$@"
+	make -C "$(linux_dir)" oldconfig
+
+$(linux_dir)/arch/x86/boot/bzImage: $(linux_dir) $(linux_dir)/.config
+	make -C "$(linux_dir)" -j 8
+	make -C "$(linux_dir)" bzImage
+	ls -Fla "$@"
+
+coreboot_version := 4.4
+coreboot_dir := coreboot-$(coreboot_version)
+coreboot_tar := coreboot-$(coreboot_version).tar.xz
+coreboot_url := https://www.coreboot.org/releases/$(coreboot_tar)
+coreboot_config := config/coreboot.config
+
+coreboot-blobs_tar := coreboot-blobs-$(coreboot_version).tar.xz
+coreboot-blobs_url := https://www.coreboot.org/releases/$(coreboot-blobs_tar)
+coreboot-blobs_dir := coreboot-$(coreboot_version)/3rdparty/blobs
+coreboot-blobs_hash := 43b993915c0f46a77ee7ddaa2dbe47581f399510632c62f2558dff931358d8ab
+coreboot-blobs_canary := $(coreboot-blobs_dir)/documentation/binary_policy.md
+
+
+$(coreboot_dir)/util/crossgcc/xgcc/bin/iasl:
+	echo '******* Building gcc (this might take a while) ******'
+	time make -C "$(coreboot_dir)" crossgcc
+
+$(coreboot_dir)/bzImage: $(linux_dir)/arch/x86/boot/bzImage
+	cp "$<" "$@"
+
+$(coreboot_dir)/initrd.img: FORCE
+	echo '*** Building initrd ***'
+	( cd initrd && \
+		find . \
+		| cpio --quiet -H newc -o \
+		) | bzip2 -9  > "$@"
+
+
+initrd: \
+	initrd/bin/busybox \
+	initrd/sbin/kexec \
+	initrd/libs
+
+initrd/bin/busybox: $(busybox_dir)/busybox
+	make -C "$(busybox_dir)" CONFIG_PREFIX="`pwd`/initrd" install 
+
+initrd/sbin/kexec: $(kexec_dir)/build/sbin/kexec
+	-mkdir "`dirnname "$@"`"
+	cp "$<" "$@"
+
+INITRD_LIBS += \
+	liblzma.so.5 \
+	libz.so.1 \
+	libc.so.6 \
+	libdl.so.2 \
+
+initrd/libs:
+	-mkdir -p initrd/lib/x86_64-linux-gnu
+	-mkdir -p initrd/lib64
+	cp /lib64/ld-linux-x86-64.so.2 initrd/lib64/
+	for lib in $(INITRD_LIBS); do \
+		cp "/lib/x86_64-linux-gnu/$$lib" initrd/lib/x86_64-linux-gnu/; \
+	done
+
+
+$(coreboot_tar):
+	wget "$(coreboot_url)"
+	sha256sum "$(coreboot_tar)"
+	echo "$(coreboot_hash)"
+
+$(coreboot-blobs_tar):
+	wget "$(coreboot-blobs_url)"
+	sha256sum "$(coreboot-blobs_tar)"
+	echo "$(coreboot-blobs_hash)"
+
+$(coreboot_blobs_canary): $(coreboot-blobs_tar)
+	tar xvf "$(coreboot-blobs_tar)"
+
+$(coreboot_dir): $(coreboot_tar)
+	tar xvf "$(coreboot_tar)"
+
+$(coreboot_dir)/.config: $(coreboot_config)
+	cp "$<" "$@"
+	make -C "$(coreboot_dir)" oldconfig
+
+$(coreboot_dir)/build/coreboot.rom:
+	$(coreboot_dir) \
+	$(coreboot_dir)/.config \
+	$(coreboot_dir)/util/crossgcc/xgcc/bin/iasl \
+	$(coreboot_dir)/bzImage \
+	$(coreboot_dir)/initrd.img \
+	$(coreboot-blobs_canary) \
+
+	make -C "$(coreboot_dir)"
+
+heads-x230.rom: $(coreboot_dir)/build/coreboot.rom
+	dd if="$<" of="$@" bs=1M skip=8
+	sha256sum "$@"
+	xxd -g 1 "$@" | head
+	xxd -g 1 "$@" | tail
+
+coreboot: heads-x230.rom
+
+FORCE: