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32 .\" $DragonFly: src/share/man/man5/kernconf.5,v 1.8 2008/07/16 01:02:07 thomas Exp $
39 .Nd kernel configuration file
52 This manual page describes the structure of the kernel configuration file.
55 to create a build environment where a kernel may be built using
59 for information on how to build kernels.
61 Each line starts with a keyword at the beginning of the line and is
62 followed by additional parameters.
63 Long input lines may be broken into shorter lines by starting the
64 second and subsequent lines with a white space character.
65 Numbers are specified using
68 Blank lines are ignored.
71 character is interpreted as a comment and is ignored along with everything
72 that follows it on the same line.
74 The following keywords are recognized in a configuration file:
76 .Bl -tag -width indent -compact
78 This system is to run on the CPU type
93 More than one CPU type specification can appear in a configuration file.
95 .It Sy device Ar name \
97 Oo Sy port Ar num Oc \
100 Oo Sy iomem Ar num Oc \
101 Oo Sy iosiz Ar num Oc \
103 Configures support for device
105 Additional parameters may be passed to specify
107 configuration settings (most often for
110 .Bl -tag -width ".Sy iomem"
112 specifies a bus to which the device is attached.
114 specifies the start address of
116 ports to be used by the device.
118 specifies the number of ports used by the device.
120 is the interrupt line number to be used.
122 specifies the physical memory address used by the device.
124 specifies the physical memory size used by the device.
126 sets various flag bits for the device.
129 .It Sy ident Ar string
130 Sets the kernel identification string to
133 .It Sy machine Ar name
134 The system is to run on the machine type
136 This is a legacy keyword, it is normally set to same value as
139 .It Sy machine_arch Ar name
140 The system is to run on the machine architecture
142 The legal architectures are
147 .It Sy makeoptions Ar name Ns Sy = Ns Ar value
154 in the kernel Makefile.
156 .It Sy maxusers Ar integer
159 variable in the kernel.
161 .It Sy options Ar name Ns Op Sy = Ns Ar value
164 Some options expect to be assigned a value, which may be an integer,
165 a double-quoted word, a bare word, or an empty string
167 Note that those are eventually handled by the C compiler, so the rules
168 of that language apply.
169 .\"For more information see the
173 .It Sy platform Ar name
174 Sets the platform of this kernel to
181 meaning either a 32 bit
183 architecture, a 64 bit
185 architecture, or a virtual kernel.
187 .It Sy pseudo-device Ar name Op Ar N
188 Includes support for the pseudo-device
190 Some pseudo-devices can have multiple or
196 .Bl -tag -width ".Pa /sys/config/X86_64_GENERIC"
197 .It Pa /sys/config/GENERIC
200 kernel configuration file
201 .It Pa /sys/config/LINT
202 kernel configuration file for checking all the sources,
203 includes description of kernel configuration options
204 .It Pa /sys/config/VKERNEL
207 kernel configuration file
208 .It Pa /sys/config/X86_64_GENERIC
211 kernel configuration file
221 manual page first appeared in