bdf80fecf0
Reviewed by: wblock MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D3153
169 lines
4.8 KiB
Groff
169 lines
4.8 KiB
Groff
.\" Copyright (c) 2001
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.\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 23, 2015
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.Dt DEVICE.HINTS 5
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.Os
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.Sh NAME
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.Nm device.hints
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.Nd device resource hints
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.Sh DESCRIPTION
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The
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.Nm
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file is read in by the boot
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.Xr loader 8
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when the system is about to start, and its contents are
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passed to the kernel.
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It contains various variables to control the boot behavior of
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the kernel.
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These variables are typically
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.Dq device hints ,
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but can include any kernel tunable values.
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.Pp
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The file contains one variable per line.
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Lines starting with the
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.Ql #
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character are comments and are ignored by the boot loader.
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.Pp
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After the file is read by the boot loader, you may examine
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the variables with the
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.Ic show
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command, and may add a new variable, modify an existing one,
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or delete a variable with the
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.Ic set
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and
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.Ic unset
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commands of the boot loader
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(see
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.Xr loader 8 ) .
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.Pp
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After the system has started, you can dump these variables
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with the
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.Xr kenv 1
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command.
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.Sh DEVICE HINTS
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Device hint variables are used by device drivers to set up
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the device.
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They are most often used by ISA device drivers to specify
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where the driver will probe for the relevant devices, and what
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resources it will attempt to use.
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.Pp
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A device hint line looks like:
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.Pp
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.Sm off
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.D1 Li hint. Ar driver . Ar unit . Ar keyword Li = Qq Ar value
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.Sm on
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.Pp
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where
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.Ar driver
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is the name of a device driver,
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.Ar unit
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is the unit number, and
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.Ar keyword
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is the keyword of the hint.
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The keyword may be:
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.Pp
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.Bl -tag -width ".Li disabled" -compact -offset indent
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.It Li at
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specifies a bus to which the device is attached.
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.It Li port
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specifies the start address of I/O ports to be used by the device.
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.It Li portsize
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specifies the number of ports used by the device.
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.It Li irq
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is the interrupt line number to be used.
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.It Li drq
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is the DMA channel number.
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.It Li maddr
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specifies the physical memory address used by the device.
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.It Li msize
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specifies the physical memory size used by the device.
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.It Li flags
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sets various flag bits for the device.
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.It Li disabled
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can be set to
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.Qq 1
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to disable the device.
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.El
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.Pp
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A device driver may require one or more hint lines with these keywords,
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and may accept other keywords not listed here, through
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.Xr resource_int_value 9 .
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Consult individual device drivers' manual pages for available
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keywords and their possible values.
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.\" .Sh CONTROL VARIABLES
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.\" Lines not starting with
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.\" .Dq hint.
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.\" specify other control variables for the kernel.
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.\" They look:
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.\" .Pp
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.\" .Dl <name>="<value>"
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.\" XXX
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.\" WE SHOULD LIST AVAILABLE VARIABLE NAMES AND THEIR POSSIBLE VALUES HERE!
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.\" .Pp
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.Sh FILES
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.Bl -tag -width ".Pa /sys/ Ns Ar ARCH Ns Pa /conf/GENERIC.hints" -compact
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.It Pa /boot/device.hints
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Device resource hints file.
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.It Pa /sys/ Ns Ar ARCH Ns Pa /conf/GENERIC.hints
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Sample resource hints for the
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.Pa GENERIC
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kernel.
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.It Pa /sys/ Ns Ar ARCH Ns Pa /conf/NOTES
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Notes on the kernel configuration file and device resource hints.
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.El
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.Sh EXAMPLES
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The following example sets up resources for the
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.Xr sio 4
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driver on the ISA bus:
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.Bd -literal -offset indent
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hint.sio.0.at="isa"
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hint.sio.0.port="0x3F8"
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hint.sio.0.flags="0x10"
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hint.sio.0.irq="4"
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.Ed
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.Pp
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The following example disables the ACPI driver:
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.Bd -literal -offset indent
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hint.acpi.0.disabled="1"
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.Ed
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.Pp
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Setting a tunable variable:
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.Bd -literal -offset indent
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vm.pmap.pg_ps_enabled=1
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.Ed
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.Sh SEE ALSO
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.Xr kenv 1 ,
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.Xr loader.conf 5 ,
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.Xr loader 8 ,
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.Xr resource_int_value 9
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.Sh HISTORY
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The
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.Nm
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file first appeared in
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.Fx 5.0 .
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