.\" Copyright (c) 1999 Robert Nordier .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS .\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, .\" OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT .\" OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR .\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, .\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE .\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, .\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .\" $Id: boot0cfg.8,v 1.1.1.1 1999/02/21 21:23:42 rnordier Exp $ .\" .Dd February 21, 1999 .Dt BOOT0CFG 8 .Os .Sh NAME .Nm boot0cfg .Nd boot manager installation/configuration utility .Sh SYNOPSIS .Nm boot0cfg .Op Fl Bv .Op Fl b Ar boot0 .Op Fl d Ar drive .Op Fl f Ar file .Op Fl o Ar options .Op Fl t Ar ticks .Ar disk .Sh DESCRIPTION The FreeBSD .Sq boot0 boot manager permits the operator to select from which disk and which slice an i386 machine (PC) is booted. .Pp Note that what are referred to here as .Dq slices are typically called .Dq partitions in non-BSD documentation relating to the PC. Typically, only non-removable disks are sliced. .Pp The .Nm utility optionally installs the .Sq boot0 boot manager on the specified .Ar disk ; and allows various operational parameters to be configured. .Pp On PCs, a boot manager typically occupies sector 0 of a disk, which is known as the Master Boot Record (MBR). The MBR contains both code (to which control is passed by the PC BIOS) and data (an embedded table of defined slices). .Pp The options are: .Bl -tag -width indent .It Fl B Install the .Sq boot0 boot manager. This option causes MBR code to be replaced, but without affecting the embedded slice table. .It Fl v Verbose: display information about the slices defined, etc. .It Fl b Ar boot0 Specify which .Sq boot0 image to use. The default is /boot/boot0. .It Fl d Ar drive Specify the drive number used by the PC BIOS in referencing the drive which contains the specified .Ar disk . Typically this will be 0x80 for the first hard drive, 0x81 for the second hard drive, and so on; however any integer between 0 and 0xff is acceptable here. .It Fl f Ar file Specify that a backup copy of the preexisting MBR should be written to .Ar file . This file is created if it does not exist, and truncated if it does. .It Fl o Ar options A comma-separated string of any of the following options may be specified (with .Dq no prepended as necessary): .Bl -tag -width indent .It packet Use the disk packet (BIOS Int 0x13 extensions) interface rather than the conventional (CHS) interface, when accessing disk-related BIOS services. The default is .Sq nopacket . .It setdrv Causes the drive containing the disk to be referenced using drive number definable by means of the -d option. The default is .Sq nosetdrv . .It update Allow the MBR to be updated by the boot manager. (The MBR may be updated to flag slices as .Sq active , and to save slice selection information.) This is the default; a .Sq noupdate option causes the MBR to be treated as read-only. .El .It Fl t Ar ticks Set the timeout value to .Ar ticks . (There are approximately 18.2 ticks per second.) .El .Sh SEE ALSO .Xr boot 8 , .Xr fdisk 8 . .Sh DIAGNOSTICS Exit status is 0 on success and >0 on error. .Sh AUTHORS .An Robert Nordier Aq rnordier@FreeBSD.org . .Sh BUGS Use of the .Sq packet option may cause .Sq boot0 to fail, depending on the nature of BIOS support. .Pp The .Sq setdrv option is presently implemented .Dq syntactically but not semantically .