$ cp minimalconfig .config
$ make -j8 bzImage

$ cd (project_root)
$ wget http://busybox.net/downloads/busybox-1.27.2.tar.bz2
$ tar xf busybox-1.27.2.tar.bz2
$ cd busybox
$ make menuconfig
Busybox Settings ---> Build Options --->Build BusyBox as a static binary (no shared libs)
$ make -j8
$ make install
$ mv _install ../rootfs
$ cd ../rootfs
$ find . | cpio -o --format=newc > ../rootfs.img
$ cd ..

qemu-system-x86_64 -kernel arch/x86/boot/bzImage -initrd (project_root)/rootfs.img -append "console=tty0 console=ttyS0,115200 root=/dev/ram rdinit=/bin/sh" -curses

# mkdir /proc /sys
# mount -t proc none /proc
# mount -t sysfs none /sys
# mdev -s