c1454d67ec
directory than the default one. If the option is not given, then the output of config is exactly as before. Only when an alternate output directory has been specified will config modify its behavior. Additional changed: o Remove the now conflicting and unused NODEV define. It conflicts with NODEV in sys/param.h. o Rename the now conflicting MACHINE token to ARCH. It conflicts with MACHINE in sys/param.h. o Fix some easy style bugs. o Fix some easy grammar bugs in the manpage. Approved by: peter, archie
251 lines
7.3 KiB
Groff
251 lines
7.3 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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 University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)config.8 8.2 (Berkeley) 4/19/94
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.\" $FreeBSD$
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.\"
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.Dd April 19, 1994
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.Dt CONFIG 8
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.Os BSD 4
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.Sh NAME
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.Nm config
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.Nd build system configuration files
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.Sh SYNOPSIS
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.Nm config
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.Op Fl gpr
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.Op Fl d Ar destdir
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.Ar SYSTEM_NAME
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.Sh DESCRIPTION
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This is the old version of the
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.Nm
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program.
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It understands the old autoconfiguration scheme
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used on the HP300, i386, DECstation, and derivative platforms.
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The new version of config is used with the
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SPARC platform.
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Only the version of
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.Nm
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applicable to the architecture that you are running
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will be installed on your machine.
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.Pp
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.Nm Config
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builds a set of system configuration files from the file
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.Ar SYSTEM_NAME
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which describes
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the system to configure.
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A second file
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tells
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.Nm
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what files are needed to generate a system and
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can be augmented by configuration specific set of files
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that give alternate files for a specific machine
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(see the
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.Sx FILES
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section below).
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.Pp
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Available options and operands:
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.Pp
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.Bl -tag -width SYSTEM_NAME
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.It Fl d Ar destdir
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Use
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.Ar destdir
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as the output directory, instead of the default one. Note
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that config does not append
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.Ar SYSTEM_NAME
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to the directory given.
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.It Fl g
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Configure a system for debugging.
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.It Fl p
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Configure a system for profiling; for example,
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.Xr kgmon 8
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and
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.Xr gprof 1 .
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If two or more
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.Fl p
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options are supplied,
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.Nm
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configures a system for high resolution profiling.
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.It Fl r
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Remove the old compile directory (see below).
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.It Ar SYSTEM_NAME
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Specifies the name of the system configuration file
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containing device specifications, configuration options
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and other system parameters for one system configuration.
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.El
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.Pp
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.Nm Config
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should be run from the
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.Pa conf
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subdirectory of the system source (usually
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.Pa /sys/ARCH/conf ) ,
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where
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.Pa ARCH
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represents one of the architectures supported by FreeBSD.
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.Nm Config
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creates the directory
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.Pa ../../compile/SYSTEM_NAME
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or the one given with the
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.Fl d
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option
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as necessary and places all output files there.
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If the output directory already exists and the
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.Fl r
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flag was specified, it will be removed first.
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The output of
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.Nm
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consists of a number of files; for the
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.Tn i386 ,
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they are:
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.Pa ioconf.c ,
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a description
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of what I/O devices are attached to the system;
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.Pa vector.h ,
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definitions of
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macros related to counting interrupts;
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.Pa Makefile ,
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used by
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.Xr make 1
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in building the system;
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header files,
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definitions of
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the number of various devices that will be compiled into the system;
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so-called swap configuration files,
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definitions for
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the disk areas to be used for the root file system
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and system dumps.
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.Pp
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After running
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.Nm config ,
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it is necessary to run
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.Dq Li make depend
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in the directory where the new makefile
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was created.
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.Nm Config
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prints a reminder of this when it completes.
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.Pp
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If any other error messages are produced by
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.Nm config ,
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the problems in the configuration file should be corrected and
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.Nm
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should be run again.
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Attempts to compile a system that had configuration errors
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are likely to fail.
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.Pp
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If the option "INCLUDE_CONFIG_FILE" is used in the configuration file the
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entire input file is embedded in the new kernel. This means that
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.Xr strings 1
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can be used to extract it from a kernel:
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to extract the configuration information, use the command
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.Bd -literal
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strings kernel | grep ___
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.Ed
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.Sh DEBUG KERNELS
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Traditional BSD kernels compiled without symbols due to the heavy load on the
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system when compiling a
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.if n "debug"
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.if t ``debug''
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kernel. A debug kernel contains complete symbols for all the source files, and
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enables an experienced kernel programmer to analyse the cause of a problem. The
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debuggers available prior to 4.4BSD-Lite were able to find some information
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from a normal kernel;
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.Xr gdb 1
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provides very little support for normal kernels, and a debug kernel is needed
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for any meaningful analysis.
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.Pp
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For reasons of history, time and space, building a debug kernel is not the
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default with FreeBSD: a debug kernel takes up to 30% longer to build and
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requires about 30 MB of disk storage in the build directory, compared to about 6
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MB for a non-debug kernel. A debug kernel is about 11 MB in size, compared to
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about 2 MB for a non-debug kernel. This space is used both in the root file
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system and at run time in memory. Use the
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.Fl g
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option to build a debug kernel. With this option,
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.Nm
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causes two kernel files to be built in the kernel build directory:
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.Bl -bullet
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.It
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.Nm kernel.debug
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is the complete debug kernel.
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.It
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.Nm kernel
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is a copy of the kernel with the debug symbols stripped off. This is equivalent
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to the normal non-debug kernel.
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.El
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.Pp
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There is currently little sense in installing and booting from a debug kernel,
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since the only tools available which use the symbols do not run on-line. There
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are therefore two options for installing a debug kernel:
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.Bl -bullet
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.It
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.Nm make
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.Ar install
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installs
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.Nm kernel
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in the root file system.
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.It
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.Nm make
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.Ar install.debug
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installs
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.Nm kernel.debug
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in the root file system.
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.El
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.Sh FILES
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.Bl -tag -width /sys/i386/conf/Makefile.i386 -compact
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.It Pa /sys/conf/files
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list of common files system is built from
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.It Pa /sys/i386/conf/Makefile.i386
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generic makefile for the
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.Tn i386
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.It Pa /sys/i386/conf/files.i386
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list of
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.Tn i386
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specific files
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.It Pa /sys/i386/conf/files. Ns Em ERNIE
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list of files specific to
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.Em ERNIE
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system
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.It Pa /sys/compile/SYSTEM_NAME
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default kernel build directory for system
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.Pa SYSTEM_NAME .
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.El
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.Sh SEE ALSO
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The SYNOPSIS portion of each device in section 4.
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.Rs
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.%T "Building 4.3 BSD UNIX System with Config"
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.Re
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.Sh BUGS
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The line numbers reported in error messages are usually off by one.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.1 .
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