127 lines
4.5 KiB
Groff
127 lines
4.5 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software written and contributed
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.\" to Berkeley by William Jolitz.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)boot_i386.8 8.2 (Berkeley) 4/19/94
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.\"
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.Dd April 19, 1994
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.Dt BOOT 8 i386
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.Os
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.Sh NAME
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.Nm boot
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.Nd
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system bootstrapping procedures
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.Sh DESCRIPTION
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.Sy Power fail and crash recovery.
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Normally, the system will reboot itself at power-up or after crashes.
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An automatic consistency check of the file systems will be performed,
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and unless this fails, the system will resume multi-user operations.
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.Pp
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.Sy Cold starts.
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The 386
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.Tn "PC AT"
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clones attempt to boot the floppy disk drive A (otherwise known as drive
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0) first, and failing that, attempt to boot the hard disk C (otherwise
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known as hard disk controller 1, drive 0).
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The automatic boot will attempt to load
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.Pa vmunix
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from partition A of either the floppy or the hard disk.
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This boot may be aborted by typing any character on the keyboard repeatedly
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(four or five times at least) during the operating system load phase, after
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which the bootstrap will prompt for the file that you wish to load instead.
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.Pp
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One exception to this is the
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.Ql d
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key, which will not abort the load but instead silently force the
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.Dv DEBUG
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boot flags.
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The boot flags for an autoboot are 0, and 3 for the successive boot after
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an aborted autoboot sequence.
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No other provison is made for setting boot flags (yet).
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A specific device or bootstrap file may be used; for example,
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.Pp
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The file specifications used for the boostrap
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when loaded with the
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.Dq askme
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flag
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(e.g. an aborted autoboot)
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are of the form:
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.Pp
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.Dl device unit partition:
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.Pp
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where
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.Ar device
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is the type of the device, assumed to be on the ISA bus, to be searched,
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.Ar unit
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is the unit number of the disk or tape,
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and
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.Ar partition
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is the disk partition or tape file number.
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Normal line editing characters can be used when typing the file specification.
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The following list of supported devices may vary from installation to
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installation:
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.Bd -unfilled -offset indent
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wd ST506, IDE, ESDI, RLL disks on a WD100[2367] or lookalike
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controller
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fd 5 1/4" or 3 1/2" High density floppies
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.Ed
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.Pp
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For example,
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to boot from a file system which starts at cylinder 0
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of unit 0 of an IDE disk, type
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.Dq Li wd0a:vmunix
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to the boot prompt;
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.Dq Li fd0a:vmunix
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would specify a 3 1/2" floppy drive 0 .
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.Pp
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In an emergency, the bootstrap methods described in the paper
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.%T "Installing and Operating 4.3 BSD-Reno UNIX on the AT/386"
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can be used
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to boot from a distribution tape.
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.Sh FILES
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.Bl -tag -width /vmunixxx -compact
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.It Pa /vmunix
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system code
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.It Pa /boot
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system bootstrap
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.El
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.Sh SEE ALSO
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.Xr halt 8 ,
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.Xr reboot 8 ,
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.Xr shutdown 8
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.Sh BUGS
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The disklabel format used by this version of
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.Bx
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is quite
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different from that of other architectures.
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