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-.\" 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd January 13, 2009
-.Dt BOOT0CFG 8
-.Os
-.Sh NAME
-.Nm boot0cfg
-.Nd boot manager installation/configuration utility
-.Sh SYNOPSIS
-.Nm
-.Op Fl Bv
-.Op Fl b Ar boot0
-.Op Fl d Ar drive
-.Op Fl e Ar bell character
-.Op Fl f Ar file
-.Op Fl i Ar volume-id
-.Op Fl m Ar mask
-.Op Fl o Ar options
-.Op Fl s Ar slice
-.Op Fl t Ar ticks
-.Ar disk
-.Sh DESCRIPTION
-The
-.Fx
-.Sq boot0
-boot manager permits the operator to select from which disk and
-slice an i386 machine (PC) is booted.
-.Pp
-Note that what are referred to here as
-.Dq slices
-are typically called
-.Dq partitions
-in
-.No non- Ns Bx
-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, without
-affecting the embedded slice table.
-.It Fl b Ar boot0
-Specify which
-.Sq boot0
-image to use.
-The default is
-.Pa /boot/boot0
-which will use the video card as output, alternatively
-.Pa /boot/boot0sio
-can be used for output to the COM1 port.
-(Be aware that nothing will be output to the COM1 port unless the
-modem signals DSR and CTS are active.)
-.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 e Ar bell character
-Set the character to be printed in case of input error.
-.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 replaced if it does.
-.It Fl i Ar volume-id
-Specifies a volume-id (in the form XXXX-XXXX) to be saved at location
-0x1b8 in the MBR. This information is sometimes used by NT, XP and Vista
-to identify the disk drive. The option is only compatible with version 2.00
-of the 512-byte boot block.
-.It Fl m Ar mask
-Specify slices to be enabled/disabled, where
-.Ar mask
-is an integer between 0 (no slices enabled) and 0xf (all four slices
-enabled).
-.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,
-as opposed to the legacy (CHS) interface, when doing disk I/O.
-This allows booting above cylinder 1023, but requires specific
-BIOS support.
-The default is
-.Sq packet .
-.It setdrv
-Forces 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 s Ar slice
-Set the default boot selection to
-.Ar slice .
-Values between 1 and 4 refer to slices; a value of 5 refers to the
-option of booting from a second disk.
-.It Fl t Ar ticks
-Set the timeout value to
-.Ar ticks .
-(There are approximately 18.2 ticks per second.)
-.It Fl v
-Verbose: display information about the slices defined, etc.
-.El
-.Sh NOTE
-Protection mechanisms in the
-.Xr geom 4
-subsystem might prevent
-.Nm
-from being able to update the MBR on a mounted disk.
-Instructions for temporarily disabling these protection mechanisms
-can be found in the
-.Xr geom 4
-manpage. Specifically, do a
-.Pp
-.Dl sysctl kern.geom.debugflags=0x10
-.Pp
-to allow writing to the MBR, and restore it to 0 afterwards.
-.Pp
-.Sh FILES
-.Bl -tag -width /boot/boot0sio -compact
-.It Pa /boot/boot0
-The default
-.Sq boot0
-image
-.It Pa /boot/boot0sio
-Image for serial consoles (COM1,9600,8,N,1,MODEM)
-.El
-.Sh EXIT STATUS
-.Ex -std
-.Sh EXAMPLES
-To boot slice 2 on the next boot:
-.Pp
-.Dl "boot0cfg -s 2 ad0"
-.Pp
-To enable just slices 1 and 2 in the menu:
-.Pp
-.Dl "boot0cfg -m 0x3 ad0"
-.Pp
-To go back to non-interactive booting, use
-.Xr fdisk 8
-to install the default MBR:
-.Pp
-.Dl "fdisk -B ad0"
-.Pp
-.Sh SEE ALSO
-.Xr geom 4 ,
-.Xr boot 8 ,
-.Xr fdisk 8
-.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
-Use of the
-.Sq setdrv
-option with an incorrect -d operand may cause the boot0 code
-to write the MBR to the wrong disk, thus trashing its previous
-content.  Be careful.