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.\"     @(#)config.8	8.2 (Berkeley) 4/19/94
.\"
.Dd April 19, 1994
.Dt CONFIG 8
.Os BSD 4
.Sh NAME
.Nm config
.Nd build system configuration files
.Sh SYNOPSIS
.Nm config
.Op Fl gpn
.Ar SYSTEM_NAME
.Sh DESCRIPTION
This is the old version of the
.Nm
program.
It understands the old autoconfiguration scheme
used on the HP300, i386, DECstation, and derivative platforms.
The new version of config is used with the
SPARC platform.
Only the version of 
.Nm
applicable to the architecture that you are running
will be installed on your machine.
.Pp
.Nm Config
builds a set of system configuration files from the file
.Ar SYSTEM_NAME
which describes
the system to configure.
A second file
tells
.Nm
what files are needed to generate a system and
can be augmented by configuration specific set of files
that give alternate files for a specific machine
(see the
.Sx FILES
section below).
.Pp
Available options and operands:
.Pp
.Bl -tag -width SYSTEM_NAME
.It Fl g
Configure a system for debugging.
.It Fl p
Configure a system for profiling; for example,
.Xr kgmon 8
and
.Xr gprof 1 .
If two or more
.Fl p
options are supplied,
.Nm
will configure a system for high resolution profiling.
.It Fl n
Do not remove the old compile directory (see below).
.It Ar SYSTEM_NAME
Specifies the name of the system configuration file
containing device specifications, configuration options
and other system parameters for one system configuration.
.El
.Pp
.Nm Config
should be run from the
.Pa conf
subdirectory of the system source (usually
.Pa /sys/ARCH/conf ) .
.Nm Config
will create the directory
.Pa ../../compile/SYSTEM_NAME
as necessary and place all output files there.
If the directory already exists, it will be removed
first unless the
.Fl n
flag was specified or the environment variable
.Ev NO_CONFIG_CLOBBER
is set.
The output of
.Nm
consists of a number of files; for the
.Tn i386 ,
they are:
.Pa ioconf.c ,
a description
of what I/O devices are attached to the system;
.Pa vector.h ,
definitions of
macros related to counting interrupts;
.Pa Makefile ,
used by
.Xr make 1
in building the system;
header files,
definitions of
the number of various devices that will be compiled into the system;
swap configuration files,
definitions for
the disk areas to be used for swapping, the root file system,
argument processing, and system dumps.
.Pp
After running
.Nm config ,
it is necessary to run
.Dq Li make depend
in the directory where the new makefile
was created.
.Nm Config
prints a reminder of this when it completes.
.Pp
If any other error messages are produced by
.Nm config ,
the problems in the configuration file should be corrected and
.Nm
should be run again.
Attempts to compile a system that had configuration errors
are likely to fail.
.Pp
If the option "INCLUDE_CONFIG_FILE" is used in the configuration file the 
entire input file is embedded in the new kernel.  This means that
.Xr strings 1
can be used to extract it from a kernel. 
.Pp
Strings | grep ___ will print just the configure information.
.Sh FILES
.Bl -tag -width /sys/i386/conf/Makefile.i386 -compact
.It Pa /sys/conf/files
list of common files system is built from
.It Pa /sys/i386/conf/Makefile.i386
generic makefile for the
.Tn i386
.It Pa /sys/i386/conf/files.i386
list of
.Tn i386
specific files
.It Pa /sys/i386/conf/devices.i386
name to major device mapping file for the
.Tn i386
.It Pa /sys/i386/conf/files. Ns Em ERNIE
list of files specific to
.Em ERNIE
system
.El
.Sh SEE ALSO
The SYNOPSIS portion of each device in section 4.
.Rs
.%T "Building 4.3 BSD UNIX System with Config"
.Re
.Sh BUGS
The line numbers reported in error messages are usually off by one.
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.1 .