Add top-level Makefile

Building the OS is now as simple as running `make` on a Gentoo system.

Interestingly, when `make` is executed as a (grand)child process of
another `make` process, it always prints an `Entering directory ...`
message.  This breaks the `make kernelversion` command, by adding
extraneous text to the output.

.gitignore

@@ -1,3 +1,5 @@
 /images
 /linux
 /output
+/.prepared
+/.host-tools

Makefile

@@ -0,0 +1,95 @@
+update.tar: output/update.tar.zstd
+
+.prepared: \
+		prepare.sh \
+		config-portage.sh \
+		setup-local-repo.sh \
+		$(shell find portage host-portage -type f) \
+		$(shell find patches/ebuilds -type f)
+	./prepare.sh
+	./config-portage.sh
+	./setup-local-repo.sh
+	touch .prepared
+
+prepare: .prepared
+
+.host-tools: \
+		build-host-tools.sh \
+		.prepared
+	./build-host-tools.sh
+	touch .host-tools
+
+host-tools: .host-tools
+
+images/rootfs.squashfs: \
+		build.sh \
+		build-rootfs.sh \
+		build-squashfs.sh \
+		linux/arch/arm64/boot/Image.gz \
+		.host-tools \
+		.prepared
+	./build.sh
+	./build-rootfs.sh
+	./build-squashfs.sh
+
+squashfs: images/rootfs.squashfs
+
+linux/arch/arm64/boot/Image.gz: \
+		build-kernel.sh \
+		linux.config \
+		.host-tools \
+		.prepared
+	./build-kernel.sh
+
+kernel: linux/arch/arm64/boot/Image.gz
+
+output/efi-part/EFI/BOOT/BOOTAA64.efi: \
+		build-grub.sh \
+		grub.cfg \
+		.host-tools \
+		.prepared
+	./build-grub.sh
+
+grub: output/efi-part/EFI/BOOT/BOOTAA64.efi
+
+output/efi-part/u-boot.bin: \
+		build-uboot.sh \
+		u-boot.config
+	./build-uboot.sh
+
+uboot: output/efi-part/u-boot.bin
+
+images/sdcard.img: \
+		genimage.cfg \
+		genimage.sh \
+		post-build.sh \
+		output/efi-part/u-boot.bin \
+		output/efi-part/EFI/BOOT/BOOTAA64.efi
+	./post-build.sh
+	./genimage.sh
+
+sdcard.img: images/sdcard.img
+
+images/firmware.img: images/sdcard.img
+
+output/update.tar.zstd: \
+		images/rootfs.squashfs \
+		images/firmware.img \
+		.host-tools \
+		.prepared
+	./build-update.sh
+
+clean:
+	git -C u-boot clean -fdx && git -C u-boot checkout -- .
+	rm -rf linux output images tmp
+	rm -f .prepared .host-tools
+
+.PHONY: \
+	grub \
+	host-tools \
+	kernel \
+	prepare \
+	sdcard.img \
+	squashfs \
+	uboot \
+	update.tar

build-kernel.sh

@@ -15,11 +15,11 @@ cd linux
     ../linux.config
 make -C /usr/src/linux O=${PWD} olddefconfig
 make -j$(nproc)
-kver=$(make kernelversion)
+kver=$(make -s kernelversion)
 make modules_install INSTALL_MOD_PATH=/mnt/gentoo
 cd -
 
-printf 'Installing Kernel ...\n'
+printf 'Installing Kernel %s ...\n' "${kver}"
 mkdir -p /mnt/gentoo/boot
 cp -au linux/arch/arm64/boot/Image.gz /mnt/gentoo/boot/vmlinuz-${kver}
 cp -au linux/.config /mnt/gentoo/boot/config-${kver}

podman-build.sh

@@ -22,7 +22,7 @@ cid=$(podman run \
 
 ./patch-uboot.sh
 
-podman exec -it ${cid} ./build-all.sh "${target}"
+podman exec -it ${cid} make
 
 podman stop ${cid}
 podman rm ${cid}