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+.\"	$NetBSD: dosboot.8,v 1.4 2023/04/24 13:55:45 manu Exp $
+.\"
+.\" Copyright (c) 1997
+.\" 	Matthias Drochner.  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.
+.\"
+.\"     @(#)boot_i386.8	8.2 (Berkeley) 4/19/94
+.\"
+.Dd February 17, 2017
+.Dt DOSBOOT 8 x86
+.Os
+.Sh NAME
+.Nm dosboot
+.Nd boot NetBSD/x86 from DOS
+.Sh SYNOPSIS
+.Nm
+.Op Fl u
+.Op Fl c Ar command
+.Op Fl i
+.Op Ar path Op Fl adqsv
+.Sh DESCRIPTION
+.Nm
+is an
+.Tn MS-DOS
+program.
+It is a boot loader for
+.Nx Ns Tn /x86
+designed to permit
+.Nx
+to be booted directly from
+.Tn MS-DOS .
+By default, it boots a file with name
+.Pa NETBSD
+in the current
+.Tn MS-DOS
+directory.
+.Nm
+shares common code with the standard boot loader,
+.Xr x86/boot 8 .
+.Pp
+The recognized options are:
+.Bl -tag -width "-adqsv" -offset 04n
+.It Fl c
+Execute
+.Ar command
+(see below).
+.It Fl i
+Enter interactive mode.
+.Nm
+will present a prompt, allowing input of commands (see below).
+.It Fl u
+Boot from a UFS file system instead of an
+.Tn MS-DOS
+file system.
+.It Ar path
+Specifies the kernel file.
+In
+.Tn MS-DOS
+mode (default) a normal
+.Tn MS-DOS
+filename (with or without drive specification) is accepted.
+In UFS mode (after
+.Fl u
+or after a
+.Ic mode ufs
+command), a path in a
+.Nx
+file system is expected.
+By default, the file is looked up in partition
+.Sq a
+of the first hard disk.
+Another device or partition can be specified
+by prepending a block device name in terms of
+.Nx ,
+followed by a colon (see
+.Xr x86/boot 8
+and examples).
+.It Fl 1234abcdmqsvxz
+Flags passed to the kernel, see
+.Xr x86/boot 8 .
+.El
+.Pp
+See
+.Xr x86/boot 8
+for commands accepted after the
+.Fl c
+flag or in interactive mode.
+.Pp
+.Nm
+is also installed in the
+.Xr release 7
+hierarchy, under
+.Pa installation/misc/dosboot.com .
+.Sh FILES
+.Pa /usr/mdec/dosboot.com
+.Sh EXAMPLES
+To boot a
+.Nx
+kernel located on
+.Tn MS-DOS
+drive D, one would issue:
+.Bd -literal -offset indent
+dosboot D:\eNODOS\eNETBSD
+.Ed
+.Pp
+To boot from a
+.Nx
+floppy into single user mode, type e.g.:
+.Bd -literal -offset indent
+dosboot -u fd0a:netbsd -s
+.Ed
+.Sh SEE ALSO
+.Xr release 7 ,
+.Xr x86/boot 8
+.Sh HISTORY
+The
+.Nx Ns Tn /x86
+.Nm
+command first appeared in
+.Nx 1.3 .
+.Sh BUGS
+.Nm
+assumes that the processor is in real mode at startup.
+It does not work well in the presence of
+.Tn MS-DOS
+extenders and memory managers.
+.Pp
+.Nm
+does not run directly under
+.Tn Windows 95 .
+.Pp
+In UFS mode, files can only be loaded from devices known to the BIOS.
+The device names do not necessarily comply with the names later
+used by the booted
+.Nx
+kernel.
+.Pp
+In
+.Tn MS-DOS
+mode, no useful boot device specification is passed to
+.Nx .
+It is necessary to have the root device hardwired into the kernel
+configuration or to enter it manually.