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Erich and Brian Ford designed the Multiboot Specification (see Motivation in ), because they were determined not to add to the large number of mutually-incompatible PC boot methods.
Erich then began modifying the Free BSD boot loader so that it would understand Multiboot.
Only kernels loaded at 1 megabyte or above are presently supported.
Any attempt to load below that boundary will simply result in immediate failure and an error message reporting the problem.
This is the documentation of GNU GRUB, the GRand Unified Bootloader, a flexible and powerful boot loader program for a wide range of architectures. This manual is for GNU GRUB (version 2.02, 25 April 2017).
Copyright © 1999,2000,2001,2002,2004,2006,2008,2009,2010,2011,2012,2013 Free Software Foundation, Inc.
In addition to the requirements above, GRUB has the following features (note that the Multiboot Specification doesn’t require all the features that GRUB supports): Support a human-readable text configuration file with preset boot commands.
The menu is based on a configuration file which you prepare beforehand (see Configuration).
By around 2007, GNU/Linux distributions started to use GRUB 2 to limited extents, and by the end of 2009 multiple major distributions were installing it by default.
GRUB 2 is a rewrite of GRUB (see History), although it shares many characteristics with the previous version, now known as GRUB Legacy.
PUPA was eventually renamed to GRUB 2, and the original version of GRUB was renamed to GRUB Legacy.
Small amounts of maintenance continued to be done on GRUB Legacy, but the last release (0.97) was made in 2005 and at the time of writing it seems unlikely that there will be another.