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+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software written and contributed
+.\" to Berkeley by William Jolitz.
+.\"
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     @(#)boot_i386.8	8.2 (Berkeley) 4/19/94
+.\"
+.Dd April 19, 1994
+.Dt BOOT 8 i386
+.Os
+.Sh NAME
+.Nm boot
+.Nd
+system bootstrapping procedures
+.Sh DESCRIPTION
+.Sy Power fail and crash recovery.
+Normally, the system will reboot itself at power-up or after crashes.
+An automatic consistency check of the file systems will be performed,
+and unless this fails, the system will resume multi-user operations.
+.Pp
+.Sy Cold starts.
+The 386
+.Tn "PC AT"
+clones attempt to boot the floppy disk drive A (otherwise known as drive
+0) first, and failing that, attempt to boot the hard disk C (otherwise
+known as hard disk controller 1, drive 0).
+The automatic boot will attempt to load
+.Pa vmunix
+from partition A of either the floppy or the hard disk.
+This boot may be aborted by typing any character on the keyboard repeatedly
+(four or five times at least) during the operating system load phase, after
+which the bootstrap will prompt for the file that you wish to load instead.
+.Pp
+One exception to this is the
+.Ql d
+key, which will not abort the load but instead silently force the
+.Dv DEBUG
+boot flags.
+The boot flags for an autoboot are 0, and 3 for the successive boot after
+an aborted autoboot sequence.
+No other provison is made for setting boot flags (yet).
+A specific device or bootstrap file may be used; for example,
+.Pp
+The file specifications used for the boostrap
+when loaded with the
+.Dq askme
+flag
+(e.g. an aborted autoboot)
+are of the form:
+.Pp
+.Dl device unit partition:
+.Pp
+where
+.Ar device
+is the type of the device, assumed to be on the ISA bus, to be searched,
+.Ar unit
+is the unit number of the disk or tape,
+and
+.Ar partition
+is the disk partition or tape file number.
+Normal line editing characters can be used when typing the file specification.
+The following list of supported devices may vary from installation to
+installation:
+.Bd -unfilled -offset indent
+wd	ST506, IDE, ESDI, RLL disks on a WD100[2367] or lookalike
+	controller
+fd	5 1/4" or 3 1/2" High density floppies
+.Ed
+.Pp
+For example,
+to boot from a file system which starts at cylinder 0
+of unit 0 of an IDE disk, type
+.Dq Li wd0a:vmunix
+to the boot prompt;
+.Dq Li fd0a:vmunix
+would specify a 3 1/2" floppy drive 0 .
+.Pp
+In an emergency, the bootstrap methods described in the paper
+.%T "Installing and Operating 4.3 BSD-Reno UNIX on the AT/386"
+can be used
+to boot from a distribution tape.
+.Sh FILES
+.Bl -tag -width /vmunixxx -compact
+.It Pa /vmunix
+system code
+.It Pa /boot
+system bootstrap
+.El
+.Sh SEE ALSO
+.Xr halt 8 ,
+.Xr reboot 8 ,
+.Xr shutdown 8
+.Sh BUGS
+The disklabel format used by this version of
+.Bx
+is quite
+different from that of other architectures.