5318a38202
the following syntax in the kernel config. makeoptions MODULES_OVERRIDE=foo makeoptions MODULES_OVERRIDE+=bar makeoptions MODULES_OVERRIDE+=baz Bump config minor version to 600007.
409 lines
10 KiB
Groff
409 lines
10 KiB
Groff
.\" Copyright (c) 2003 Joseph Koshy
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 3, 2005
|
|
.Dt CONFIG 5
|
|
.Os
|
|
.Sh NAME
|
|
.Nm config
|
|
.Nd kernel configuration file format
|
|
.Sh DESCRIPTION
|
|
A kernel configuration file specifies the configuration of a
|
|
.Fx
|
|
kernel.
|
|
It is processed by
|
|
.Xr config 8
|
|
to create a build environment where a kernel may be built using
|
|
.Xr make 1 .
|
|
.Ss Lexical Structure
|
|
A kernel configuration file comprises a sequence of specification
|
|
directives.
|
|
.Pp
|
|
A specification directive starts with a keyword at the beginning
|
|
of the line and is followed by additional parameters.
|
|
.Pp
|
|
A specification directive may be terminated by a semicolon
|
|
.Ql \&;
|
|
or by a newline.
|
|
Long input lines may be broken into shorter lines by starting the
|
|
second and subsequent lines with a white space character.
|
|
.Pp
|
|
Case is significant,
|
|
.Dq Li machine
|
|
and
|
|
.Dq Li MACHINE
|
|
are different tokens.
|
|
.Pp
|
|
A double quote character
|
|
.Ql \[dq]
|
|
starts a quoted string.
|
|
All characters up to the next quote character form the value
|
|
of the quoted string.
|
|
A
|
|
.Ql \[dq]
|
|
character may be inserted into a quoted string by
|
|
using the sequence
|
|
.Ql \e\[dq] .
|
|
.Pp
|
|
Numbers are specified using
|
|
.Tn C Ns -style
|
|
syntax.
|
|
.Pp
|
|
A
|
|
.Ql #
|
|
character starts a comment; all characters from the
|
|
.Ql #
|
|
character till the end of the current line are ignored.
|
|
.Pp
|
|
Whitespace between tokens is ignored, except inside quoted strings.
|
|
Whitespace following a comment line is ignored.
|
|
.Ss Configuration Directives
|
|
Kernel configuration directives may appear in any order
|
|
in a kernel configuration file.
|
|
Directives are processed in order of appearance with subsequent
|
|
directive lines overriding the effect of prior ones.
|
|
.Pp
|
|
The list of keywords and their meanings are as follows:
|
|
.Bl -tag -width indent -compact
|
|
.\" -------- CPU --------
|
|
.Pp
|
|
.It Ic cpu Ar cputype
|
|
Specify the CPU this kernel will run on.
|
|
There can be more than one
|
|
.Ic cpu
|
|
directive in a configuration file.
|
|
The allowed list of CPU names is architecture specific and is
|
|
defined in the file
|
|
.Pa sys/conf/options. Ns Aq Ar arch .
|
|
.\" -------- DEVICE --------
|
|
.Pp
|
|
.It Ic device Ar name Op , Ar name Op ...
|
|
.It Ic devices Ar name Op , Ar name Op ...
|
|
Configures the specified devices
|
|
for inclusion into the kernel image.
|
|
Devices that are common to all architectures are
|
|
defined in the file
|
|
.Pa sys/conf/files .
|
|
Devices that are specific to architecture
|
|
.Ar arch
|
|
are defined in the file
|
|
.Pa sys/conf/files. Ns Aq Ar arch .
|
|
.\" -------- ENV --------
|
|
.Pp
|
|
.It Ic env Ar filename
|
|
Specifies a filename containing a kernel environment definition.
|
|
The kernel normally uses an environment prepared for it at boot time
|
|
by
|
|
.Xr loader 8 .
|
|
This directive makes the kernel ignore the boot environment and use
|
|
the compiled-in environment instead.
|
|
.Pp
|
|
This directive is useful for setting kernel tunables in
|
|
embedded environments that do not start from
|
|
.Xr loader 8 .
|
|
.\" -------- FILES --------
|
|
.Pp
|
|
.It Ic files Ar filename
|
|
Specifies a file containing a list of files specific to that kernel
|
|
configuration file (a la
|
|
.Pa files. Ns Aq Ar arch ) .
|
|
.\" -------- HINTS --------
|
|
.Pp
|
|
.It Ic hints Ar filename
|
|
Specifies a file to load a static device configuration specification
|
|
from.
|
|
From
|
|
.Fx 5.0
|
|
onwards, the kernel reads the system's device configuration at boot
|
|
time (see
|
|
.Xr device.hints 5 ) .
|
|
This directive configures the kernel to use the static device configuration
|
|
listed in
|
|
.Ar filename .
|
|
The file
|
|
.Ar filename
|
|
must conform to the syntax specified by
|
|
.Xr device.hints 5 .
|
|
Multiple hints lines are allowed.
|
|
The resulting hints will be the files concatenated in the order of appearance.
|
|
.\" -------- IDENT --------
|
|
.Pp
|
|
.It Ic ident Ar name
|
|
Set the kernel name to
|
|
.Ar name .
|
|
At least one
|
|
.Ic ident
|
|
directive is required.
|
|
.\" -------- INCLUDE --------
|
|
.Pp
|
|
.It Ic include Ar filename
|
|
Read subsequent text from file
|
|
.Ar filename
|
|
and return to the current file after
|
|
.Ar filename
|
|
is successfully processed.
|
|
.\" -------- MACHINE --------
|
|
.Pp
|
|
.It Ic machine Ar arch Op Ar cpuarch
|
|
Specifies the architecture of the machine the kernel is being
|
|
compiled for.
|
|
Legal values for
|
|
.Ar arch
|
|
include:
|
|
.Pp
|
|
.Bl -tag -width ".Cm powerpc" -compact
|
|
.It Cm alpha
|
|
The DEC Alpha architecture.
|
|
.It Cm arm
|
|
The ARM architecture.
|
|
.It Cm amd64
|
|
The AMD x86-64 architecture.
|
|
.It Cm i386
|
|
The Intel x86 based PC architecture.
|
|
.It Cm ia64
|
|
The Intel IA64 architecture.
|
|
.It Cm mips
|
|
The MIPS architecture.
|
|
.It Cm pc98
|
|
The PC98 architecture.
|
|
.It Cm powerpc
|
|
The IBM PowerPC architecture.
|
|
.It Cm sparc64
|
|
The Sun Sparc64 architecture.
|
|
.El
|
|
.Pp
|
|
If argument
|
|
.Ar cpuarch
|
|
is specified, it points
|
|
.Xr config 8
|
|
to the cpu architecture of the machine.
|
|
Currently the
|
|
.Cm pc98
|
|
architecture requires its cpu architecture
|
|
to be set to
|
|
.Cm i386 .
|
|
When
|
|
.Ar cpuarch
|
|
is not specified, it is assumed to be the same as
|
|
.Ar arch .
|
|
.Ar arch
|
|
corresponds to MACHINE.
|
|
.Ar cpuarch
|
|
corresponds to MACHINE_ARCH.
|
|
.Pp
|
|
A kernel configuration file may have only one
|
|
.Ic machine
|
|
directive.
|
|
.\" -------- MAKEOPTION --------
|
|
.Pp
|
|
.It Ic makeoption Ar options
|
|
.It Ic makeoptions Ar options
|
|
Add
|
|
.Ar options
|
|
to the generated makefile.
|
|
.Pp
|
|
The
|
|
.Ar options
|
|
argument is a comma separated list of one or more option
|
|
specifications.
|
|
Each option specification has the form
|
|
.Pp
|
|
.D1 Ar MakeVariableName Ns Op = Ns Ar Value
|
|
.D1 Ar MakeVariableName Ns += Ns Ar Value
|
|
.Pp
|
|
and results in the appropriate
|
|
.Xr make 1
|
|
variable definition being inserted into the generated makefile.
|
|
If only the name of the
|
|
.Xr make 1
|
|
variable is specified,
|
|
.Ar value
|
|
is assumed to be the empty string.
|
|
.Pp
|
|
Example:
|
|
.Bd -literal -offset indent -compact
|
|
makeoptions MYMAKEOPTION="foo"
|
|
makeoptions MYMAKEOPTION+="bar"
|
|
makeoptions MYNULLMAKEOPTION
|
|
.Ed
|
|
.\" -------- MAXUSERS --------
|
|
.Pp
|
|
.It Ic maxusers Ar number
|
|
This optional directive is used to configure the size
|
|
of some kernel data structures.
|
|
The parameter
|
|
.Ar number
|
|
can be 0 (the default) or an integer greater than or equal to 2.
|
|
A value of 0 indicates that the kernel should configure
|
|
its data structures according to the size of available
|
|
physical memory.
|
|
If auto configuration is requested, the kernel will set
|
|
this tunable to a value between 32 and 384.
|
|
.Pp
|
|
As explained in
|
|
.Xr tuning 7 ,
|
|
this tunable can also be set at boot time using
|
|
.Xr loader 8 .
|
|
.\" -------- NOCPU --------
|
|
.Pp
|
|
.It Ic nocpu Ar cputype
|
|
Remove the specified CPU
|
|
from the list of previously selected CPUs.
|
|
This directive can be used to cancel the effect of
|
|
.Ic cpu
|
|
directives in files included using
|
|
.Ic include .
|
|
.\" -------- NODEVICE --------
|
|
.Pp
|
|
.It Ic nodevice Ar name Op , Ar name Op ...
|
|
.It Ic nodevices Ar name Op , Ar name Op ...
|
|
Remove the specified devices
|
|
from the list of previously selected devices.
|
|
This directive can be used to cancel the effects of
|
|
.Ic device
|
|
or
|
|
.Ic devices
|
|
directives in files included using
|
|
.Ic include .
|
|
.\" -------- NOMAKEOPTION --------
|
|
.Pp
|
|
.It Ic nomakeoption Ar name
|
|
.It Ic nomakeoptions Ar name
|
|
Removes previously defined
|
|
.Xr make 1
|
|
option
|
|
.Ar name
|
|
from the kernel build.
|
|
This directive can be used to cancel the effects of
|
|
.Ic makeoption
|
|
directives in files included using
|
|
.Ic include .
|
|
.\" -------- NOOPTION --------
|
|
.Pp
|
|
.It Ic nooption Ar name Op , Ar name Op ...
|
|
.It Ic nooptions Ar name Op , Ar name Op ...
|
|
Remove the specified kernel options
|
|
from the list of previously defined options.
|
|
This directive can be used to cancel the effects of
|
|
.Ic option
|
|
or
|
|
.Ic options
|
|
directives in files included using
|
|
.Ic include .
|
|
.\" -------- OPTIONS --------
|
|
.Pp
|
|
.It Ic option Ar optionspec Op , Ar optionspec Op ...
|
|
.It Ic options Ar optionspec Op , Ar optionspec Op ...
|
|
Add compile time kernel options to the kernel build.
|
|
Each option specification has the form
|
|
.Pp
|
|
.D1 Ar name Ns Op = Ns Ar value
|
|
.Pp
|
|
If
|
|
.Ar value
|
|
is not specified, it is assumed to be
|
|
.Dv NULL .
|
|
Options common to all architectures are specified in
|
|
the file
|
|
.Pa sys/conf/options .
|
|
Options specific to architecture
|
|
.Ar arch
|
|
are specified in the file
|
|
.Pa sys/conf/options. Ns Aq Ar arch .
|
|
.\" -------- PROFILE --------
|
|
.Pp
|
|
.It Ic profile Ar number
|
|
Enables kernel profiling if
|
|
.Ar number
|
|
is non-zero.
|
|
If
|
|
.Ar number
|
|
is 2 or greater, the kernel is configured for
|
|
high-resolution profiling.
|
|
Kernels can also be built for profiling using the
|
|
.Fl p
|
|
option to
|
|
.Xr config 8 .
|
|
.El
|
|
.Ss Obsolete Directives
|
|
The following kernel configuration directives are obsolete.
|
|
.Bl -tag -width indent
|
|
.\" -------- CONFIG --------
|
|
.Pp
|
|
.It Ic config
|
|
This directive was used to specify the device to be used for the root
|
|
file system.
|
|
From
|
|
.Fx 4.0
|
|
onwards, this information is passed to a booting kernel by
|
|
.Xr loader 8 .
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa sys/conf/Makefile. Ns Ar arch" -compact
|
|
.It Pa sys/compile/ Ns Ar NAME
|
|
Compile directory created from a kernel configuration.
|
|
.It Pa sys/conf/Makefile. Ns Ar arch
|
|
.Pa Makefile
|
|
fragments for architecture
|
|
.Ar arch .
|
|
.It Pa sys/conf/files
|
|
Devices common to all architectures.
|
|
.It Pa sys/conf/files. Ns Ar arch
|
|
Devices for architecture
|
|
.Ar arch .
|
|
.It Pa sys/conf/options
|
|
Options common to all architectures.
|
|
.It Pa sys/conf/options. Ns Ar arch
|
|
Options for architecture
|
|
.Ar arch .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr kenv 1 ,
|
|
.Xr make 1 ,
|
|
.Xr device.hints 5 ,
|
|
.Xr loader.conf 5 ,
|
|
.Xr config 8 ,
|
|
.Xr kldload 8 ,
|
|
.Xr loader 8
|
|
.Rs
|
|
.%T "Building 4.4BSD Kernels with Config"
|
|
.%A "Samuel J. Leffler"
|
|
.%A "Michael J. Karels"
|
|
.Re
|
|
.Sh HISTORY
|
|
The
|
|
.Xr config 8
|
|
utility first appeared in
|
|
.Bx 4.1 ,
|
|
and was subsequently revised in
|
|
.Bx 4.4 .
|
|
.Pp
|
|
The kernel configuration mechanism changed further in
|
|
.Fx 4.0
|
|
and
|
|
.Fx 5.0 ,
|
|
moving toward an architecture supporting dynamic kernel
|
|
configuration.
|