BOOTLOADER

The drive where bootloaders and OSes are installed on these examples is "/dev/sda", but could be anywhere.
The bootloader installation IS inside chroot AND with drives mounted, so this guide assumes you are inside "/mnt/drive".
"<PARTITION_NUMBER_OF_ROOT>", "<PARTITION_NUMBER_OF_FREEDOS>" and "<PARTITION_NUMBER_OF_WINDOWS>" are just the numbers of partitions.
Specifically, "<PARTITION_NUMBER_OF_ROOT>" is the partition number of your root partition.
The "vmlinuz" file makes reference to the kernel image, you can rename it or simlink to it in all cases, the only rule is you have to make sure the name is referenced correctly in the bootloader. By default it can have names like "vmlinuz-linux", "vmlinuz-<KERNEL_VERSION>" and so on. The same with "initramfs.img", it can be "initramfs-<KERNEL_VERSION>.img" and such.
All bootloader examples have included other OS inside what is called "stanzas".
FreeDOS and Windows stanzas are OPTIONAL.
If dualbooting with Windows remember that it likes to be in the first partition.
If on UEFI check if module is loaded by issuing "modprobe efivars".
On CRUX do "prt-get remove lilo" if you dont use LILO.
On Source Mage GNU/Linux do "cast <BOOTLOADER>" to install the preferred bootloader.

Supported filesystems by bootloaders, they will boot the OS only if the "/boot" partition has a supported filesystem. If on "UEFI" ignore this as it only supports "FAT".:

LILO: indifferent (anything?)
SYSLINUX: ext2, ext3, ext4, btrfs, ufs 1/2, FAT16, FAT32, iso9660, udf, NTFS.
GRUB Legacy: FAT16, FAT32, minix, ext2, ext3, ext4, ReiserFS, JFS, XFS, VSTa fs, Btrfs.
GRUB 2: ext2, ext3, ext4, btrfs, zfs, ufs, minix, iso9660, udf, jfs, hfs, hfs+, afs, affs, sfs, xfs, reiserfs, tar, cpio, NTFS, FAT16, FAT32.

LILO

If on UEFI use elilo and change names to "/etc/elilo.conf" instead of "/etc/lilo.conf" and "elilo" instead of "lilo" in commands.
nano /etc/lilo.conf
Inserting "password=<PASSWORD>" inside an OS stanza will protect with a password that OS, but inserting "password=<PASSWORD>" just before the stanzas and outside any of them will protect with a password the bootloader itself (notice the space inside stanzas)

boot = /dev/sda
image = /boot/vmlinuz
     Label = <DISTRO_NAME>
     root = /dev/sda<PARTITION_NUMBER_OF_ROOT>
other = /dev/sda<PARTITION_NUMBER_OF_FREEDOS>
     table = /dev/sda
     Label = FreeDOS
other = /dev/sda<PARTITION_NUMBER_OF_WINDOWS>
     table = /dev/sda
     Label = Windows7

Set boot entry

lilo -A /dev/sda 1
lilo

Prevent anyone but root of reading the config file (in case you used a password)
chmod 600 /etc/lilo.conf

SYSLINUX

If on BIOS make directory and copy files accordingly

mkdir -p /boot/syslinux
cp /usr/lib/syslinux/bios/*.c32 /boot/syslinux/

If on UEFI make directory and copy files accordingly

mkdir -p /boot/efi/EFI/syslinux
cp -r /usr/lib/syslinux/efi64/* /boot/efi/EFI/syslinux/

If on BIOS set boot entry

umount /dev/sda1
syslinux --directory syslinux --install /dev/sda1
mount /dev/sda1 /boot

If on UEFI set boot entry using "efibootmgr"

umount /dev/sda1
efibootmgr -c -d /dev/sda -p 1 -l /boot/efi/EFI/syslinux/syslinux.efi -L Syslinux
mount /dev/sda1 /boot/efi

Edit "/boot/syslinux/syslinux.cfg" if on BIOS or "/boot/efi/EFI/syslinux/syslinux.cfg" if on UEFI
"splash.png" is the splash screen image located in "/boot/syslinux/" if on BIOS or "/boot/efi/EFI/syslinux/" if on UEFI

PROMPT 1
TIMEOUT 50
MENU BACKGROUND splash.png
DEFAULT <DISTRO_NAME>
LABEL <DISTRO_NAME>
      MENU LABEL <DISTRO_NAME>
      LINUX /boot/vmlinuz
      INITRD /boot/initramfs.img
LABEL FreeDOS
      MENU LABEL FreeDOS
      KERNEL chain.c32
      APPEND sda <PARTITION_NUMBER_OF_FREEDOS>
LABEL Windows7
      MENU LABEL Windows7
      KERNEL chain.c32
      APPEND sda <PARTITION_NUMBER_OF_WINDOWS>

GRUB Legacy

If on BIOS set boot entry (boot partition must be mounted)

mount /dev/sda1 /boot
grub-install /dev/sda

If on UEFI set boot entry (boot partition must be mounted)

mount /dev/sda1 /boot/efi
grub-install /boot/efi

Edit configuration file "/boot/grub/menu.lst"

default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
title <DISTRO_NAME> (<KERNEL_VERSION>)
        root (hd0,<PARTITION_NUMBER_OF_ROOT>)
        kernel /vmlinuz-<KERNEL_VERSION> ro root=/dev/sda5 rhgb quiet
        initrd /initramfs-<KERNEL_VERSION>.img
title <DISTRO_NAME_alternative_kernel> (<ANOTHER_KERNEL_VERSION>)
        root (hd0,<PARTITION_NUMBER_OF_ROOT>)
        kernel /vmlinuz-<ANOTHER_KERNEL_VERSION> ro root=/dev/sda5 rhgb quiet
        initrd /initramfs-<ANOTHER_KERNEL_VERSION>.img
title FreeDOS
        root (hd0,<PARTITION_NUMBER_OF_FREEDOS>)
        kernel /memdisk
        initrd (hd0,<PARTITION_NUMBER_OF_FREEDOS>)/fdboot.img
title Windows 7
        root (hd0,<PARTITION_NUMBER_OF_WINDOWS>)
        chainloader /EFI/Microsoft/Boot/bootmgfw.efi

GRUB 2

If on BIOS set boot entry (boot partition must be mounted)

mount /dev/sda1 /boot
grub-install /dev/sda

If on UEFI set boot entry (boot partition must be mounted)

mount /dev/sda1 /boot/efi
grub-install /boot/efi

If Grub does not detect your OS run "os-prober" followed by "update-grub"
Or add the OS manually to the Grub config file "/etc/grub.d/40_custom"

menuentry "FreeDOS" {
set root='(hd0,msdos2)'
linux16 /memdisk
initrd16 /fdboot.img
chainloader +1
}
menuentry "Windows 7" {
insmod part_msdos
insmod ntfs
insmod search_fs_uuid
insmod ntldr
search --fs-uuid --no-floppy --set=root 3482FBC382FB879E
chainloader +1
ntldr /bootmgr
}

Update config file
grub-mkconfig -o /boot/grub/grub.cfg

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BOOTLOADER

LILO

SYSLINUX

GRUB Legacy

GRUB 2

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