1.\" $OpenBSD: cdboot.8,v 1.10 2016/03/30 06:58:06 jmc Exp $ 2.\" Copyright (c) 2004 Tom Cosgrove 3.\" Copyright (c) 2003 Matthias Drochner 4.\" Copyright (c) 1999 Doug White 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd $Mdocdate: March 30 2016 $ 29.Dt CDBOOT 8 i386 30.Os 31.Sh NAME 32.Nm cdboot 33.Nd i386-specific second-stage CD-specific bootstrap 34.Sh DESCRIPTION 35.Nm 36is a modified version of the i386 second-stage bootstrap program, 37.Xr boot 8 , 38configured to be run by the 39.Ox 40El Torito CD-ROM boot sector 41.Pa cdbr . 42.Nm 43will look for an 44.Pa /etc/boot.conf 45configuration 46file on the CD-ROM. 47If it finds one, it processes the commands within it. 48.Pa boot.conf 49processing can be skipped by holding down either Control key as 50.Nm 51starts. 52.Pp 53.Nm 54then sits in a loop, 55processing commands given by the user. 56It accepts all the commands accepted by 57.Xr boot 8 . 58.Pp 59If no commands are given for a short time, 60.Nm 61will then attempt to load an 62.Ox 63kernel from the CD. 64It first looks for the install kernel 65.Pa bsd.rd 66in the standard i386 release directory 67(e.g.\& 68.Pa /3.6/i386/bsd.rd ) , 69then for 70.Pa /bsd . 71It may be told to boot an alternative kernel, 72either by commands in the 73.Pa boot.conf 74file, 75or by commands typed by the user at the 76.Ic boot> 77prompt. 78.Sh FILES 79.Bl -tag -width /usr/mdec/cdbootxx -compact 80.It Pa /usr/mdec/cdboot 81CD-specific second-stage bootstrap 82.It Pa /etc/boot.conf 83.Nm 84configuration file (read from CD) 85.El 86.Sh EXAMPLES 87Boot the install kernel: 88.Pp 89.Dl boot> bsd.rd 90.Sh SEE ALSO 91.Xr boot 8 , 92.Xr boot_i386 8 , 93.Xr mkhybrid 8 94.Sh STANDARDS 95.Rs 96.%A Curtis E. Stevens 97.%A Stan Merkin 98.%D January 25, 1995 99.%N Version 1.0 100.%T "El Torito Bootable CD-ROM Format Specification" 101.Re 102.Sh HISTORY 103The 104.Nm 105program first appeared in 106.Ox 3.6 . 107.Sh CAVEATS 108By default, many CD creation programs restrict filenames to 109the MS-DOS 8.3 format. 110Unless this is changed, 111.Nm 112will not be able to read its 113.Xr boot.conf 8 114file. 115For example, with 116.Xr mkhybrid 8 117the 118.Fl l 119option should be specified. 120.Sh BUGS 121The 122.Ic ls 123command does not work on ISO 9660 (cd9660) filesystems, 124which are used on most CDs. 125