diff --git a/Makefile b/Makefile
index a8f3f5d..406c847 100644
--- a/Makefile
+++ b/Makefile
@@ -13,11 +13,12 @@ toolchain_wrkdir := $(wrkdir)/riscv-gnu-toolchain
 toolchain_dest := $(CURDIR)/toolchain
 
 buildroot_srcdir := $(srcdir)/buildroot
-buildroot_wrkdir := $(wrkdir)/buildroot
-buildroot_tar := $(buildroot_wrkdir)/images/rootfs.tar
+buildroot_initramfs_wrkdir := $(wrkdir)/buildroot_initramfs
+buildroot_initramfs_tar := $(buildroot_initramfs_wrkdir)/images/rootfs.tar
+buildroot_initramfs_config := $(confdir)/buildroot_initramfs_config
 
-sysroot_stamp := $(wrkdir)/.sysroot
-sysroot := $(wrkdir)/sysroot
+buildroot_initramfs_sysroot_stamp := $(wrkdir)/.buildroot_initramfs_sysroot
+buildroot_initramfs_sysroot := $(wrkdir)/buildroot_initramfs_sysroot
 
 linux_srcdir := $(srcdir)/linux
 linux_wrkdir := $(wrkdir)/linux
@@ -66,17 +67,22 @@ $(toolchain_dest)/bin/$(target)-gcc: $(toolchain_srcdir)
 	$(MAKE) -C $(toolchain_wrkdir)
 	sed 's/^#define LINUX_VERSION_CODE.*/#define LINUX_VERSION_CODE 263682/' -i $(toolchain_dest)/sysroot/usr/include/linux/version.h
 
-$(buildroot_tar): $(buildroot_srcdir) $(RISCV)/bin/$(target)-gcc
-	$(MAKE) -C $< RISCV=$(RISCV) PATH=$(PATH) O=$(buildroot_wrkdir) riscv64_defconfig
-	$(MAKE) -C $< RISCV=$(RISCV) PATH=$(PATH) O=$(buildroot_wrkdir)
+$(buildroot_initramfs_wrkdir)/.config: $(buildroot_srcdir)
+	rm -rf $(dir $@)
+	mkdir -p $(dir $@)
+	cp $(buildroot_initramfs_config) $@
+	$(MAKE) -C $< RISCV=$(RISCV) PATH=$(PATH) O=$(buildroot_initramfs_wrkdir) olddefconfig
 
-.PHONY: buildroot-menuconfig
-buildroot-menuconfig: $(buildroot_srcdir)
-	$(MAKE) -C $< O=$(buildroot_wrkdir) menuconfig
+$(buildroot_initramfs_tar): $(buildroot_srcdir) $(buildroot_initramfs_wrkdir)/.config $(RISCV)/bin/$(target)-gcc $(buildroot_initramfs_config)
+	$(MAKE) -C $< RISCV=$(RISCV) PATH=$(PATH) O=$(buildroot_initramfs_wrkdir)
 
-$(sysroot_stamp): $(buildroot_tar)
-	mkdir -p $(sysroot)
-	tar -xpf $< -C $(sysroot) --exclude ./dev --exclude ./usr/share/locale
+.PHONY: buildroot_initramfs-menuconfig
+buildroot_initramfs-menuconfig: $(buildroot_srcdir)
+	$(MAKE) -C $< O=$(buildroot_initramfs_wrkdir) menuconfig
+
+$(buildroot_initramfs_sysroot_stamp): $(buildroot_initramfs_tar)
+	mkdir -p $(buildroot_initramfs_sysroot)
+	tar -xpf $< -C $(buildroot_initramfs_sysroot) --exclude ./dev --exclude ./usr/share/locale
 	touch $@
 
 $(linux_wrkdir)/.config: $(linux_defconfig) $(linux_srcdir)
@@ -95,9 +101,9 @@ ifeq ($(ISA),$(filter rv32%,$(ISA)))
 	$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
 endif
 
-$(vmlinux): $(linux_srcdir) $(linux_wrkdir)/.config $(sysroot_stamp)
+$(vmlinux): $(linux_srcdir) $(linux_wrkdir)/.config $(buildroot_initramfs_sysroot_stamp)
 	$(MAKE) -C $< O=$(linux_wrkdir) \
-		CONFIG_INITRAMFS_SOURCE="$(confdir)/initramfs.txt $(sysroot)" \
+		CONFIG_INITRAMFS_SOURCE="$(confdir)/initramfs.txt $(buildroot_initramfs_sysroot)" \
 		CONFIG_INITRAMFS_ROOT_UID=$(shell id -u) \
 		CONFIG_INITRAMFS_ROOT_GID=$(shell id -g) \
 		ARCH=riscv \
@@ -162,8 +168,8 @@ $(rootfs):
 	truncate --size=1G $@
 	mkfs.ext4 $@
 
-.PHONY: sysroot vmlinux bbl
-sysroot: $(sysroot)
+.PHONY: buildroot_initramfs_sysroot vmlinux bbl
+buildroot_initramfs_sysroot: $(buildroot_initramfs_sysroot)
 vmlinux: $(vmlinux)
 bbl: $(bbl)
 
diff --git a/conf/buildroot_initramfs_config b/conf/buildroot_initramfs_config
new file mode 100644
index 0000000..bf2a6d3
--- /dev/null
+++ b/conf/buildroot_initramfs_config
@@ -0,0 +1,19 @@
+BR2_riscv64=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_PATH="$(RISCV)"
+BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX="$(ARCH)-unknown-linux-gnu"
+BR2_TOOLCHAIN_EXTERNAL_GCC_7=y
+BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_6=y
+BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
+# BR2_TOOLCHAIN_EXTERNAL_INET_RPC is not set
+BR2_TOOLCHAIN_EXTERNAL_CXX=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_2r1=y
+BR2_PACKAGE_DROPBEAR=y
+BR2_PACKAGE_DROPBEAR_CLIENT=y
+BR2_PACKAGE_DROPBEAR_SMALL=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
+BR2_TARGET_GENERIC_ROOT_PASSWD="sifive"
+BR2_SYSTEM_DHCP="eth0"
+BR2_PACKAGE_PCIUTILS=y