.\"
.\" Copyright (c) 2007
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.\" $DragonFly: src/share/man/man5/kernconf.5,v 1.3 2007/11/07 20:56:20 swildner Exp $
.\"
.Dd September 13, 2007
.Os
.Dt KERNCONF 5
.Sh NAME
.Nm kernconf
.Nd kernel configuration file
.Sh SYNOPSIS
.Cd cpu ...
.Cd device ...
.Cd ident ...
.Cd machine ...
.Cd machine-arch ...
.Cd makeoptions ...
.Cd maxusers ...
.Cd options ...
.Cd platform ...
.Cd pseudo-device ...
.Sh DESCRIPTION
This manual page describes the structure of the kernel configuration file.
Blank lines are ignored.
The
.Sq #
character is interpreted as a comment and is ignored along with everything
that follows it on the same line.
See
.Xr config 8
for information on how to configure and build kernels.
.Sh KEYWORDS
The following keywords are recognized in a configuration file:
.Bl -ohang
.It Sy cpu Xo
.Ar name
.Xc
This system is to run on the CPU type
.Ar name .
Legal types are
.Sy I486_CPU
(i486),
.Sy I586_CPU
.Tn ( Pentium ) ,
and
.Sy I686_CPU
.Tn ( Pentium Pro ) .
More than one CPU type specification can appear in a configuration file.
.It Sy device Xo
.Ar name
.Xc
Configures support for device
.Ar name .
.It Sy ident Xo
.Ar string
.Xc
Sets the kernel identification string to
.Ar string .
.It Sy machine Xo
.Ar name
.Xc
The system is to run on the machine type
.Ar name .
This is a legacy keyword and must be set to
.Sy i386 .
.It Sy machine_arch Xo
.Ar name
.Xc
The system is to run on the machine architecture
.Ar name .
The only legal architecture is
.Sy i386 .
.It Sy makeoptions Xo
.Ar name=value
.Xc
Defines a
.Xr make 1
macro
.Ar name
with the value
.Ar value
in the kernel Makefile.
.It Sy maxusers Xo
.Ar integer
.Xc
Set the
.Va maxusers
variable in the kernel.
.It Sy options Xo
.Ar name Ns Bq Ar =value
.Xc
Sets the option
.Ar name .
Some options expect to be assigned a value, which may be an integer,
a double-quoted word, a bare word, or an empty string
.Pq Qq .
Note that those are eventually handled by the C compiler, so the rules
of that language apply.
.\"For more information see the
.\".Sx OPTIONS
.\"section.
.It Sy platform Xo
.Ar name
.Xc
Sets the platform of this kernel to
.Ar name .
Legal platforms are
.Sy pc32
and
.Sy vkernel ,
meaning either a 32 bit
.Tn Intel
architecture or a virtual kernel.
.It Sy pseudo-device Xo
.Ar name
.Op Ar N
.Xc
Includes support for the pseudo-device
.Ar name .
Some pseudo-devices can have multiple or
.Ar N
instances.
.El
.\".Sh OPTIONS
.Sh SEE ALSO
.Xr build 7 ,
.Xr vkernel 7 ,
.Xr config 8
.Sh HISTORY
The
.Nm
manual page first appeared in
.Dx 1.11 .