Grub is a modern boot-loader which is able to read the filesystem natively and includes a shell-like interface to manipulate the configuration on-the-fly. It only needs to store the block-list for the second stage loader (unlike LILO which needs to store the block-list for each kernel image - and so need to be rerun after each kernel or config change).

Clean Install

In T2 Linux the grub package installs a STONE module which can configure and install grub automatically.

Configuration Example for Manual Installation

The layout of configuration file /boot/grub/menu.lst differs from the usual lilo style config.

The file might contain multiple sections. Each section starts with the 'title' keyword specifying the name used by grub to refer to this configuration. The next statement needs to specify the partition grub should read the kernel image from. Via the keyword 'kernel' grub set up to load the specified file for execution and pass the optional arguments. The optional arguments usually include 'root=' to specify the system's root device as well as 'ro' to configure that the root device should be mounted read only by default. So a basic configuration looks like:

title  T2 Linux
  root (hd1,0)
  kernel /boot/vmlinuz root=/dev/ide/host0/bus0/target0/lun0/part2 ro

Creating a GRUB Floppy Disk

Although grub is one of the most advanced boot-loaders, it sometimes fails to install from inside a Linux system (e.g. when many IDE or SCSI devices are present and the BIOS devices can not be guessed - or when floppy support is enabled in the BIOS but no floppy drive is present). In such a case or for maintenance you might want to install grub from a floppy disk. First you need to create a grub floppy via:

cat /boot/grub/stage1 /boot/grub/stage2 > /dev/floppy/0

which outputs the two grub files stage1 and stage2 which are then written to your floppy drive 0. It is bootable and can be used to boot or install grub on defect systems.

Installing GRUB from a floppy disk

After creating the boot-disk in the last section you boot this floppy and perform the installation of grub from out-side of the OS (using grubs native BIOS access when the x86 is running in Real-Mode ...). Do this by entering the following in the grub shell: (do not forget to substitute the disk and partition number 0 to the ones used on your workstation!)

install (hd0,0)/boot/grub/stage1 (hd0) (hd0,0)/boot/grub/stage2 \

This tells grub to install the stage1 file /boot/grub/stage1 from the 1st partition of your first hard-disk into the first hard-disk's Master-Boot-Record (MBR). Grub will then use the stage2 file /boot/grub/stage2 and the menu file /boot/grub/menu.lst from the same hard-disk and partition.