baremetal.sh

#!/bin/bash

size_in_mib=32
bytes=$((2 ** 20 * $size_in_mib))
sectors=$(($bytes / 512))
heads=16
cylinders=$(($sectors / $heads / 63))

dd if=/dev/zero of=baremetal.img bs=512 count=$sectors
dd if=fat16mbr.bin of=baremetal.img conv=notrunc

losetup /dev/loop0 baremetal.img
sfdisk -D -H $heads -C $cylinders -S 63 /dev/loop0 <<EOF
,,6,*
EOF
blockdev --rereadpt /dev/loop0
mkdosfs -F 16 /dev/loop0p1
if [ ! -e baremetal ]; then mkdir baremetal; fi
mount -t vfat /dev/loop0p1 baremetal
cp -v pure64.sys kernel64.sys baremetal
sync
umount baremetal
losetup -d /dev/loop0

dd if=boot16b.bin of=baremetal.img conv=notrunc bs=1 seek=32318 skip=62

if [ -e baremetal.vdi ]; then
  rm -i baremetal.vdi
fi
if [ ! -e baremetal.vdi ]; then
  VBoxManage convertdd baremetal.img baremetal.vdi
fi