diff --git a/linux/buildroot-scripts/Makefile b/linux/buildroot-scripts/Makefile
index b0e3bdf9..7e0c0cfc 100644
--- a/linux/buildroot-scripts/Makefile
+++ b/linux/buildroot-scripts/Makefile
@@ -1,3 +1,6 @@
+IMAGES := ${RISCV}/buildroot/output/images
+DIS := ${IMAGES}/disassembly
+
 all:
 	make disassemble
 	make generate
@@ -7,15 +10,18 @@ generate:
 	dtc -I dts -O dtb ../devicetree/wally-virt.dts > ${RISCV}/buildroot/output/images/wally-virt.dtb
 
 disassemble:
-	mkdir ${RISCV}/buildroot/output/images/disassembly
-	# fw_jump
-	riscv64-unknown-elf-objdump -D ${RISCV}/buildroot/output/images/fw_jump.elf >> ${RISCV}/buildroot/output/images/disassembly/fw_jump.objdump
-	# vmlinux
-	riscv64-unknown-elf-objdump -D ${RISCV}/buildroot/output/images/vmlinux >> ${RISCV}/buildroot/output/images/disassembly/vmlinux.objdump
+	mkdir -p ${DIS}
+	make -j ${DIS}/fw_jump.objdump ${DIS}/vmlinux.objdump
 	# filesystem
 	mkdir ${RISCV}/buildroot/output/images/disassembly/rootfs
 	-cd ${RISCV}/buildroot/output/images/disassembly/rootfs; cpio -idv < ../../rootfs.cpio
+	riscv64-unknown-elf-objdump -D ${RISCV}/buildroot/output/images/disassembly/rootfs/bin/busybox >> ${RISCV}/buildroot/output/images/disassembly/busybox.objdump
+
+${DIS}/fw_jump.objdump: ${IMAGES}/fw_jump.elf
+	riscv64-unknown-elf-objdump -D ${RISCV}/buildroot/output/images/fw_jump.elf >> ${RISCV}/buildroot/output/images/disassembly/fw_jump.objdump
+${DIS}/vmlinux.objdump: ${IMAGES}/vmlinux
+	riscv64-unknown-elf-objdump -D ${RISCV}/buildroot/output/images/vmlinux >> ${RISCV}/buildroot/output/images/disassembly/vmlinux.objdump
 
 clean:
-	rm ${RISCV}/buildroot/output/images/wally-virt.dtb
-	rm -rf ${RISCV}/buildroot/output/images/disassembly
+	rm -f ${IMAGES}/wally-virt.dtb
+	rm -rf ${DIS}