Add initial build infrastructure

.gitignore

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+work/

.gitmodules

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+[submodule "linux"]
+	path = linux
+	url = https://github.com/riscv/riscv-linux.git
+[submodule "buildroot"]
+	path = buildroot
+	url = https://github.com/a0u/buildroot.git
+[submodule "riscv-pk"]
+	path = riscv-pk
+	url = git@bitbucket.org:sifive/riscv-pk.git

Makefile

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+
+srcdir := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
+srcdir := $(srcdir:/=)
+confdir := $(srcdir)/conf
+wrkdir := $(CURDIR)/work
+
+buildroot_srcdir := $(srcdir)/buildroot
+buildroot_wrkdir := $(wrkdir)/buildroot
+buildroot_tar := $(buildroot_wrkdir)/images/rootfs.tar
+
+sysroot_stamp := $(wrkdir)/.sysroot
+sysroot := $(wrkdir)/sysroot
+
+linux_srcdir := $(srcdir)/linux
+linux_wrkdir := $(wrkdir)/linux
+linux_defconfig := $(confdir)/linux_defconfig
+
+vmlinux := $(linux_wrkdir)/vmlinux
+vmlinux_stripped := $(linux_wrkdir)/vmlinux-stripped
+
+pk_srcdir := $(srcdir)/riscv-pk
+pk_wrkdir := $(wrkdir)/riscv-pk
+bbl := $(pk_wrkdir)/bbl
+bin := $(wrkdir)/bbl.bin
+
+target := riscv64-unknown-linux-gnu
+
+.PHONY: all
+all: $(bin)
+
+$(buildroot_tar): $(buildroot_srcdir)
+	$(MAKE) -C $< O=$(buildroot_wrkdir) riscv64_defconfig
+	$(MAKE) -C $< O=$(buildroot_wrkdir)
+
+.PHONY: buildroot-menuconfig
+buildroot-menuconfig: $(buildroot_srcdir)
+	$(MAKE) -C $< O=$(buildroot_wrkdir) menuconfig
+
+$(sysroot_stamp): $(buildroot_tar)
+	mkdir -p $(sysroot)
+	tar -xpf $< -C $(sysroot) --exclude ./dev
+	touch $@
+
+$(linux_wrkdir)/.config: $(linux_defconfig) $(linux_srcdir)
+	mkdir -p $(dir $@)
+	cp -p $< $@
+	$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
+
+$(vmlinux): $(linux_srcdir) $(linux_wrkdir)/.config $(sysroot_stamp)
+	$(MAKE) -C $< O=$(linux_wrkdir) \
+		CONFIG_INITRAMFS_SOURCE="$(confdir)/initramfs.txt $(sysroot)" \
+		CONFIG_INITRAMFS_ROOT_UID=$(shell id -u) \
+		CONFIG_INITRAMFS_ROOT_GID=$(shell id -g) \
+		ARCH=riscv \
+		vmlinux
+
+$(vmlinux_stripped): $(vmlinux)
+	$(target)-strip -o $@ $<
+
+.PHONY: linux-menuconfig
+linux-menuconfig: $(linux_wrkdir)/.config
+	$(MAKE) -C $(linux_srcdir) O=$(dir $<) ARCH=riscv menuconfig savedefconfig
+
+$(bbl): $(pk_srcdir) $(vmlinux_stripped)
+	rm -rf $(pk_wrkdir)
+	mkdir -p $(pk_wrkdir)
+	cd $(pk_wrkdir) && $</configure \
+		--host=$(target) \
+		--with-payload=$(vmlinux_stripped)
+	$(MAKE) -C $(pk_wrkdir)
+
+$(bin): $(bbl)
+	$(target)-objcopy -S -O binary --change-addresses -0x80000000 $< $@
+
+.PHONY: sysroot vmlinux bbl
+sysroot: $(sysroot)
+vmlinux: $(vmlinux)
+bbl: $(bbl)
+
+.PHONY: clean
+clean:
+	rm -rf -- $(wrkdir)

buildroot

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+Subproject commit 8dd56de89c1fe51fcee14f8d873d7b3a1f0e2d80

conf/initramfs.txt

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+dir /dev 755 0 0
+nod /dev/console 644 0 0 c 5 1
+nod /dev/null 644 0 0 c 1 3
+slink /init /bin/busybox 755 0 0

conf/linux_defconfig

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+# CONFIG_COMPACTION is not set
+CONFIG_HZ_100=y
+CONFIG_CROSS_COMPILE="riscv64-unknown-linux-gnu-"
+CONFIG_DEFAULT_HOSTNAME="ucbvax"
+# CONFIG_CROSS_MEMORY_ATTACH is not set
+CONFIG_NAMESPACES=y
+CONFIG_BLK_DEV_INITRD=y
+# CONFIG_RD_BZIP2 is not set
+# CONFIG_RD_LZMA is not set
+# CONFIG_RD_XZ is not set
+# CONFIG_RD_LZO is not set
+# CONFIG_RD_LZ4 is not set
+CONFIG_EMBEDDED=y
+# CONFIG_BLK_DEV_BSG is not set
+CONFIG_PARTITION_ADVANCED=y
+# CONFIG_EFI_PARTITION is not set
+# CONFIG_IOSCHED_DEADLINE is not set
+CONFIG_NET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
+# CONFIG_INET_XFRM_MODE_TUNNEL is not set
+# CONFIG_INET_XFRM_MODE_BEET is not set
+# CONFIG_INET_LRO is not set
+# CONFIG_INET_DIAG is not set
+# CONFIG_IPV6 is not set
+# CONFIG_WIRELESS is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+# CONFIG_FIRMWARE_IN_KERNEL is not set
+# CONFIG_BLK_DEV is not set
+# CONFIG_INPUT_MOUSEDEV is not set
+# CONFIG_INPUT_KEYBOARD is not set
+# CONFIG_INPUT_MOUSE is not set
+# CONFIG_VT is not set
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+# CONFIG_USB_SUPPORT is not set
+# CONFIG_IOMMU_SUPPORT is not set
+CONFIG_EXT2_FS=y
+# CONFIG_FILE_LOCKING is not set
+# CONFIG_DNOTIFY is not set
+# CONFIG_INOTIFY_USER is not set
+# CONFIG_PROC_PAGE_MONITOR is not set
+CONFIG_TMPFS=y
+# CONFIG_MISC_FILESYSTEMS is not set
+# CONFIG_NETWORK_FILESYSTEMS is not set
+CONFIG_EARLY_PRINTK=y
+CONFIG_PRINTK_TIME=y
+CONFIG_STRIP_ASM_SYMS=y
+CONFIG_DEBUG_SECTION_MISMATCH=y
+# CONFIG_FRAME_POINTER is not set
+# CONFIG_CRYPTO_ANSI_CPRNG is not set
+# CONFIG_CRYPTO_HW is not set

linux

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+Subproject commit 67628e091e461e0851f2a98120fcbdc1fa2a7ebb

riscv-pk

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+Subproject commit 67983fdf1228f714169d49c8761842757933f01c