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32 .\" @(#)config.8 8.2 (Berkeley) 4/19/94
33 .\" $FreeBSD: src/usr.sbin/config/config.8,v 1.21.2.7 2003/04/23 07:32:39 brueffer Exp $
40 .Nd build system configuration files
47 This is the old version of the
50 It understands the old autoconfiguration scheme
51 used on the HP300, i386, DECstation, and derivative platforms.
58 applicable to the architecture that you are running
59 will be installed on your machine.
63 utility builds a set of system configuration files from the file
66 the system to configure.
70 what files are needed to generate a system and
71 can be augmented by configuration specific set of files
72 that give alternate files for a specific machine
77 Available options and operands:
78 .Bl -tag -width ".Ar SYSTEM_NAME"
82 as the output directory, instead of the default one.
87 to the directory given.
89 Configure a system for debugging.
91 Configure a system for profiling; for example,
99 configures a system for high resolution profiling.
101 Remove the old compile directory (see below).
103 Specify the name of the system configuration file
104 containing device specifications, configuration options
105 and other system parameters for one system configuration.
109 should be run from the
111 subdirectory of the system source (usually
112 .Pa /sys/ Ns Va ARCH Ns Pa /conf ) ,
115 represents one of the architectures supported by
118 creates the directory
119 .Pa ../../compile/ Ns Ar SYSTEM_NAME
120 or the one given with the
123 as necessary and places all output files there.
124 If the output directory already exists and the
126 flag was specified, it will be removed first.
129 consists of a number of files; for the
134 of what I/O devices are attached to the system;
138 in building the system;
141 the number of various devices that will be compiled into the system.
145 it is necessary to run
147 in the directory where the new makefile
151 utility prints a reminder of this when it completes.
153 If any other error messages are produced by
155 the problems in the configuration file should be corrected and
158 Attempts to compile a system that had configuration errors
162 .Cd "options INCLUDE_CONFIG_FILE"
163 is used in the configuration file the
164 entire input file is embedded in the new kernel.
167 can be used to extract it from a kernel:
168 to extract the configuration information, use the command
170 .Dl "strings -n 3 kernel | sed -n 's/^___//p'"
174 kernels are compiled without symbols due to the heavy load on the
175 system when compiling a
178 A debug kernel contains complete symbols for all the source files, and
179 enables an experienced kernel programmer to analyse the cause of a problem.
181 debuggers available prior to
183 were able to find some information
184 from a normal kernel;
186 provides very little support for normal kernels, and a debug kernel is needed
187 for any meaningful analysis.
189 For reasons of history, time and space, building a debug kernel is not the
192 a debug kernel takes up to 30% longer to build and
193 requires about 30 MB of disk storage in the build directory, compared to about 6
194 MB for a non-debug kernel.
195 A debug kernel is about 11 MB in size, compared to
196 about 2 MB for a non-debug kernel.
197 This space is used both in the root file
198 system and at run time in memory.
201 option to build a debug kernel.
204 causes two kernel files to be built in the kernel build directory:
208 is the complete debug kernel.
211 is a copy of the kernel with the debug symbols stripped off.
213 to the normal non-debug kernel.
216 There is currently little sense in installing and booting from a debug kernel,
217 since the only tools available which use the symbols do not run on-line.
219 are therefore two options for installing a debug kernel:
222 .Dq Li "make install"
225 in the root file system.
227 .Dq Li "make install.debug"
230 in the root file system.
233 .Bl -tag -width ".Pa /sys/ Ns Va ARCH Ns Pa /conf/files. Ns Ar SYSTEM_NAME" -compact
234 .It Pa /sys/conf/files
235 list of common files system is built from
236 .It Pa /sys/conf/Makefile. Ns Va ARCH
237 generic makefile for the
239 .It Pa /sys/conf/files. Ns Va ARCH
243 .It Pa /sys/ Ns Va ARCH Ns Pa /conf/files. Ns Ar SYSTEM_NAME
244 list of files specific to
248 .It Pa /sys/compile/ Ns Ar SYSTEM_NAME
249 default kernel build directory for system
255 portion of each device in section 4.
257 .%T "Building 4.3 BSD UNIX System with Config"
260 The line numbers reported in error messages are usually off by one.