242 lines
6.2 KiB
Groff
242 lines
6.2 KiB
Groff
.\" $NetBSD: sunlabel.8,v 1.4 2002/12/21 08:11:28 lukem Exp $
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.\"
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.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Thomas Klausner.
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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 NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd December 21, 2002
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.Dt SUNLABEL 8
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.Os
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.Sh NAME
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.Nm sunlabel
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.Nd read or modify a SunOS disk label
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.Sh SYNOPSIS
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.Nm
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.Op Fl mnqs
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.Ar device
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.Sh DESCRIPTION
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.Nm
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reads or modifies a
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.Tn SunOS
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disk label on
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.Ar device ,
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which is used by the
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.Tn PROM
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on
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.Nx Ns /sparc
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hardware to find partitions to boot from.
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.Nm
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only reads/writes the first 512 bytes of
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.Ar device .
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.Pp
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The supported options are:
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.Bl -tag -width 4n -offset indent
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.It Fl m
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Ignore an incorrect magic number in the disk label.
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.It Fl n
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Synthesize a new label rather than reading what is there.
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.It Fl q
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Quiet mode - don't print unnecessary babble (currently
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this suppresses the
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.Dq sunlabel\*[Gt]
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prompt).
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.It Fl s
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Ignore checksum errors when reading the label.
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.El
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.Pp
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Note that
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.Fl m
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is dangerous, especially when combined with
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.Fl s ,
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since it will then happily believe whatever garbage it may
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find in the label. When using these flags, all values should be
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checked carefully, both those printed by
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.Ic L
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and the partition table printed by
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.Ic P .
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.Pp
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.Nm
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prints a prompt
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.Dq sunlabel\*[Gt]
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and expects commands.
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The following commands are understood:
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.Bl -tag -width 16n -offset indent
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.It \&?
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Show a short help message.
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.It Ic [abcdefghijklmnop] Ar \*[Lt]cylno\*[Gt] Ar \*[Lt]size\*[Gt]
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Change partition (see below).
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.It Ic L
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Print label, except for the partition table.
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.It Ic P
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Print the partition table.
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.It Ic Q
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Quit program (error if no write since last change).
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.It Ic Q!
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Quit program (unconditionally) [EOF also quits].
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.It Ic S
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Set label in the kernel (orthogonal to
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.Ic W ) .
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.It Ic V Ar \*[Lt]name\*[Gt] Ar \*[Lt]value\*[Gt]
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Change a non-partition label value.
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.It Ic W
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Write (possibly modified) label out.
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.El
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.Pp
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The
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.Ic a
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through
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.Ic p
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commands will accept, for the
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.Ar \*[Lt]size\*[Gt]
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parameter, the
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.Ar nnn/nnn/nnn
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syntax used by
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.Tn SunOS 4.x
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.Ic format .
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(For those not
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familiar with this syntax,
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.Ar a/b/c
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means
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.Ar a
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cylinders +
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.Ar b
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tracks +
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.Ar c
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sectors. For example, if the disk has 16 tracks of 32 sectors,
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.Ar 3/4/5
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means (3*16*32)+(4*32)+5=1669. This calculation always uses the
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.Ar nsect
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and
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.Ar ntrack
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values as printed by the
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.Ic L
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command; in particular, if they are zero (which they will initially be
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if
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.Fl n
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is used), this syntax is not very useful. Some additional strings are
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accepted. For the
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.Ar \*[Lt]cylno\*[Gt]
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parameter,
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.Dq end-X
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(where
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.Ar X
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is a partition letter) indicates that the partition should start with
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the first free cylinder after partition
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.Ar X ;
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.Dq start-X
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indicates that the partition should start at the same place as
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partition
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.Ar X .
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For the
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.Ar \*[Lt]size\*[Gt]
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parameter,
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.Dq end-X
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indicates that the partition should end at the same place as partition
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.Ar X
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(even if partition
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.Ar X
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ends partway through a cylinder);
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.Dq start-X
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indicates that the partition should end with the last cylinder before
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partition
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.Ar X ;
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and
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.Dq size-X
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means that the partition's size should exactly match partition
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.Ar X Ns No 's
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size.
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.Pp
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Note that
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.Nm
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supports 16 partitions.
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.Tn SunOS
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supports only 8.
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Labels written by
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.Nm "" ,
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when partitions
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.Ar i
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through
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.Ar p
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are all set
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.Ar offset=0 size=0 ,
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are identical to
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.Tn Sun
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labels. If any of the
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.Dq extended
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partitions are nontrivial, information about them is tucked into some
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otherwise unused space in the
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.Tn Sun
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label format.
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.Pp
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The
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.Ic V
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command changes fields printed by the
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.Ic L
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command.
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For example, if the
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.Ic L
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command prints
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.Bd -literal -offset indent
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ascii: ST15230N cyl 5657 alt 2 hd 19 sec 78
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rpm: 0 pcyl: 0 apc: 0 obs1: 0
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obs2: 0 intrlv: 1 ncyl: 5657 acyl: 0
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nhead: 19 nsect: 78 obs3: 0 obs4: 0
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.Ed
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.Pp
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then
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.Ic V Ar ncyl 6204
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would set the
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.Ar ncyl
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value to 6204, or
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.Ic V
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.Ar "ascii Seagate ST15230N cyl 5657 hd 19 sec varying"
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would set the ascii-label string to that string.
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.Nm
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performs very few consistency checks on the values you supply, and the
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ones it does perform never generate errors, only warnings.
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.Sh AUTHORS
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.An der Mouse Aq mouse@rodents.montreal.qc.ca
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.Sh BUGS
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It may be that the space in the label where the information for the
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extended partitions is saved is used by
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.Tn SunOS .
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.Pp
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Not very many consistency checks are done on the
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.Ic V
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arguments, and those only produce warnings.
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.Pp
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.Nx
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doesn't support 16 partitions in a
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.Tn Sun
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disk label yet.
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