Multi-Boot GRUB2 Configuration

grub.cfg

if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
set timeout=-1
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
insmod fat

menuentry 'FreeDOS 1.1 (16-bit)' --class windows {
	set root='hd0,msdos1'
	drivemap -s (hd0) ${root}
	chainloader +1
}
menuentry 'Fedora 20 (32-bit)' --class fedora --class gnu-linux --class gnu {
	set root='hd0,msdos2'
	linux	/boot/vmlinuz-3.15.10-201.fc20.i686 root=/dev/sda2 ro vconsole.font=latarcyrheb-sun16
	initrd	/boot/initramfs-3.15.10-201.fc20.i686.img
}
menuentry 'Android-x86 4.4 (32-bit)' {
	set root='hd0,msdos3'
	linux /android-4.4-r1/kernel root=/dev/ram0 androidboot.hardware=android_x86 video=-16 SRC=/android-4.4-r1
	initrd /android-4.4-r1/initrd.img
}
menuentry 'CentOS 7.0 (64-bit)' --class gnu-linux --class gnu {
	set root='hd0,msdos5'
	linux16 /boot/vmlinuz-3.10.0-123.6.3.el7.x86_64 root=/dev/sda5 ro
	initrd16 /boot/initramfs-3.10.0-123.6.3.el7.x86_64.img
}
menuentry 'Debian 7.6 (32-bit)' --class gnu-linux {
	set root='hd0,msdos6'
	linux /boot/vmlinuz-3.2.0-4-486 root=/dev/sda6 ro
	initrd /boot/initrd.img-3.2.0-4-486
}
menuentry 'Ubuntu 14.04 (32-bit)' --class gnu-linux --class gnu {
	set root='hd0,msdos7'
	linux /boot/vmlinuz-3.13.0-30-generic root=/dev/sda7 ro
	initrd /boot/initrd.img-3.13.0-30-generic
}
menuentry 'RemixOS 3.0 (64-bit)' {
	set root='hd0,msdos8'
	linux /RemixOS/kernel root=/dev/ram0 androidboot.hardware=remix_x86_64 video=-16 SRC=/RemixOS
	initrd /RemixOS/initrd.img
}