In order to be able to boot the LFS system, we need to update our bootloader. We're assuming that your host system is using Lilo (since that's the most commonly used boot loader at the moment).
We will not be running the lilo program inside chroot. Running lilo inside chroot can have fatal side-effects which render your MBR useless and you'd need a boot disk to be able to start any Linux system (either the host system or the LFS system).
First we'll exit chroot and copy the lfskernel file to the host system:
logout cp $LFS/boot/lfskernel /boot
The next step is adding an entry to /etc/lilo.conf so that we can choose LFS when booting the computer:
cat >> /etc/lilo.conf << "EOF" image=/boot/lfskernel label=lfs root=<partition> read-only EOF
<partition> must be replaced with the LFS partition's designation.
Also note that if you are using reiserfs for your root partition, the line read-only should be changed to read-write.
Now, update the boot loader by running:
The last step is synchronizing the host system's lilo configuration files with the LFS system's:
cp /etc/lilo.conf $LFS/etc && cp $(grep "image.*=" /etc/lilo.conf | cut -f 2 -d "=") $LFS/boot