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101 lines
3.2 KiB
Groff
101 lines
3.2 KiB
Groff
.\"
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.\" Copyright (c) 2017 Netflix, Inc.
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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.
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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 AUTHORS ``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 AUTHORS 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 October 12, 2020
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.Dt DEVMATCH 8
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.Os
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.Sh NAME
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.Nm devmatch
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.Nd print information about unattached devices
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.Sh SYNOPSIS
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.Nm
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.Op Fl adhpuv
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.Op Fl -all
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.Op Fl -dump
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.Op Fl -hints Ar file
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.Op Fl -nomatch Ar event
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.Op Fl -unbound
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.Op Fl -verbose
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.Sh DESCRIPTION
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The
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.Nm
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utility, without any arguments, prints all the kernel modules it has
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found for all the unattached, enabled devices in the system.
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.Bl -tag -width 20m
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.It Fl a Fl -all
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Include all devices, not just the ones that are unattached.
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.It Fl d Fl -dump
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Produce a human readable dump of the
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.Pa linker.hints
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file.
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.It Fl h Fl -hints Ar file
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Use the named
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.Ar file
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instead of
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.Pa linker.hints
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guessed from the current module load path.
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.It Fl p Fl -nomatch Ar event
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Parse and use a standard NOMATCH event from
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.Xr devd 8
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for matching instead of searching the device tree.
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.It Fl u Fl -unbound
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Attempt to produce a list of those drivers with PNP info whose driver
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tables with that PNP info can not be found.
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.It Fl v Fl -verbose
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Produce more verbose output.
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.El
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.Sh SEE ALSO
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.Xr devinfo 8 ,
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.Xr MODULE_PNP_INFO 9
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.Sh HISTORY
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.Nm
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first appeared in
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.Fx 12.0 .
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.Sh AUTHORS
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.An Warner Losh Aq Mt imp@FreeBSD.org
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.Sh BUGS
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The kernel has hints in it, but we exclude it from the list of modules
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to suggest for unmatched devices.
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We exclude it when suggesting drivers, but include it when looking for
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unbound devices or producing a full dump of
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.Pa linker.hints .
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This can be confusing.
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.Pp
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Some modules are hard links in
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.Pa /boot/kernel
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and will be reported twice.
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.Pp
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The PNP string's attributes are evaluated once per PNP entry on that
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bus rather than once.
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.Pp
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The term PNP is overloaded in FreeBSD.
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It means, generically, the identifying data the bus provides about a
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device.
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While this include old ISA PNP identifiers, it also includes the
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logical equivalent in USB, PCI, and others.
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.Pp
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Many drivers currently lack proper PNP table decorations and need to
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be updated.
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