11c5aee5eb
options, sort SEE ALSOs, etc. Add support for on-the-fly switching of console devices interactively from biosboot via the "consdev" command.
173 lines
3.2 KiB
Groff
173 lines
3.2 KiB
Groff
.\" $NetBSD: dosboot.8,v 1.8 2000/05/13 05:27:21 jhawk Exp $
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.Dd June 20, 1997
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.Os
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.Dt DOSBOOT 8 i386
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.Sh NAME
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.Nm dosboot
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.Nd boot NetBSD/i386 from DOS
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.Sh SYNOPSIS
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.Nm
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.Op Fl u
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.Op Fl c Ar command
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.Op Fl i
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.Op Ar path Op Fl adrs
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.Sh DESCRIPTION
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.Nm
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is an
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.Tn MS-DOS
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program. It is a boot loader for
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.Nx Ns Tn /i386
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designed to permit
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.Nx
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to be booted directly from
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.Tn MS-DOS .
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By default, it boots a file with
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name
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.Pa NETBSD
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in the current
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.Tn MS-DOS
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directory.
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.Nm
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shares common code with the standard boot loader,
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.Xr boot 8 .
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.Pp
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The recognized options are:
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.Bl -tag -width -adrs
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.It Fl u
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Boot from a UFS filesystem instead of an
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.Tn MS-DOS
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filesystem.
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.It Fl c
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Execute
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.Ar command
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(see below).
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.It Fl i
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Enter interactive mode.
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.Nm
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will present a prompt, allowing input of commands (see below).
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.Pp
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.It Pa path
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Specifies the kernel file. In
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.Tn MS-DOS
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mode (default) a normal
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.Tn MS-DOS
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filename (with or without drive specification) is accepted.
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In UFS mode (after
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.Fl u
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or after a
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.Ic mode ufs
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command), a path in a
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.Nx
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filesystem
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is expected. By default, the file is looked up in partition 'a' of
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the first harddisk. Another device or partition can be specified
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by prepending a block device name in terms of
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.Nx ,
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followed
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by a colon (see
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.Xr boot 8
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and examples).
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.It Fl adrs
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Flags passed to the kernel, see
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.Xr boot 8 .
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.El
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.Pp
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The commands accepted after the
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.Fl c
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flag or in interactive mode are:
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.\" NOTE: much of this text is duplicated in boot.8; please try to
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.\" keep both files synchronized.
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.Bl -tag -width 04n -offset 04n
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.It Xo Ic boot
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.Op Va device : Ns
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.Op Va filename
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.Op Fl adrs
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.Xc
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Boot
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.Nx . See
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.Cm boot
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in
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.Xr boot 8
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for full details.
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.It Ic dev Op device
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Set the default device and partition for subsequent filesystem operations.
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Without an operand, print the current setting.
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This setting doesn't apply to
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.Tn MS-DOS
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mode.
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.It Ic help
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Print an overview about commands and arguments.
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.It Ic ls Op Pa path
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Print a directory listing of
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.Pa path ,
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containing inode number, filename and file type. This command works in
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UFS mode only. path can contain a device specification.
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.It Ic mode Va fstype
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Switch filesystem type;
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.Va fstype
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should be one of
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.Ar dos
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or
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.Ar ufs .
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.It Ic quit
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Leave the
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.Nm
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program and exit to
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.Tn MS-DOS .
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.El
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.Sh EXAMPLES
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To boot a
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.Nx
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kernel located on
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.Tn MS-DOS
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drive D, one would issue:
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.Bd -literal -offset indent
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dosboot D:\\NODOS\\NETBSD
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.Ed
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.Pp
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To boot from a
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.Nx
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floppy into single user mode, type eg:
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.Bd -literal -offset indent
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dosboot -u fd0a:netbsd -s
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.Ed
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.Sh BUGS
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.Nm
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assumes that the processor is in real mode at startup. It does not work
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well in the presence of
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.Tn MS-DOS
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extenders and memory managers.
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.Pp
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.Nm
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does not run directly under
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.Tn Windows 95 .
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See
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.Xr w95boot 8
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for a method of starting
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.Nx
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from
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.Tn Windows 95
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using dosboot.
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.Pp
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In UFS mode, files can only be loaded from devices known to the BIOS.
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The device names do not necessarily comply with the names later
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used by the booted
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.Nx
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kernel.
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.Pp
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In
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.Tn MS-DOS
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mode, no useful boot device specification is passed to
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.Nx .
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It is necessary to have the root device hardwired into the kernel
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configuration or to enter it manually.
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.Sh SEE ALSO
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.Xr boot 8 ,
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.Xr w95boot 8
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.Sh HISTORY
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The
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.Nx Ns Tn /i386
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.Nm
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command first appeared in
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.Nx 1.3 .
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