Added simple scripts for generic automation.

.gitignore

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+.gitignore
+busybox*
+isoimage
+kernel*
+linux*
+*.iso
+syslinux*
+

clean.sh

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+#!/bin/sh
+rm -rf busybox* isoimage kernel* linux* *.iso syslinux*
+

minimal.sh

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+#!/bin/sh
+set -ex
+KERNEL_VERSION=4.12.3
+BUSYBOX_VERSION=1.27.1
+SYSLINUX_VERSION=6.03
+wget -O kernel.tar.xz http://kernel.org/pub/linux/kernel/v4.x/linux-$KERNEL_VERSION.tar.xz
+wget -O busybox.tar.bz2 http://busybox.net/downloads/busybox-$BUSYBOX_VERSION.tar.bz2
+wget -O syslinux.tar.xz http://kernel.org/pub/linux/utils/boot/syslinux/syslinux-$SYSLINUX_VERSION.tar.xz
+tar -xvf kernel.tar.xz
+tar -xvf busybox.tar.bz2
+tar -xvf syslinux.tar.xz
+mkdir isoimage
+cd busybox-$BUSYBOX_VERSION
+make distclean defconfig
+sed -i "s/.*CONFIG_STATIC.*/CONFIG_STATIC=y/" .config
+make busybox install
+cd _install
+rm -f linuxrc
+mkdir dev proc sys
+echo '#!/bin/sh' > init
+echo 'dmesg -n 1' >> init
+echo 'mount -t devtmpfs none /dev' >> init
+echo 'mount -t proc none /proc' >> init
+echo 'mount -t sysfs none /sys' >> init
+echo 'setsid cttyhack /bin/sh' >> init
+chmod +x init
+find . | cpio -R root:root -H newc -o | gzip > ../../isoimage/rootfs.gz
+cd ../../linux-$KERNEL_VERSION
+make mrproper defconfig bzImage
+cp arch/x86/boot/bzImage ../isoimage/kernel.gz
+cd ../isoimage
+cp ../syslinux-$SYSLINUX_VERSION/bios/core/isolinux.bin .
+cp ../syslinux-$SYSLINUX_VERSION/bios/com32/elflink/ldlinux/ldlinux.c32 .
+echo 'default kernel.gz initrd=rootfs.gz' > ./isolinux.cfg
+genisoimage \
+    -J \
+    -r \
+    -o ../minimal_linux_live.iso \
+    -b isolinux.bin \
+    -c boot.cat \
+    -input-charset UTF-8 \
+    -no-emul-boot \
+    -boot-load-size 4 \
+    -boot-info-table \
+    -joliet-long \
+    ./
+cd ..
+set +ex
+

qemu64.sh

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+#!/bin/sh
+qemu-system-x86_64 -m 128M -cdrom minimal_linux_live.iso -boot d -vga std
+