d9aed21ce3
devmatch(8) matchs up devices in the system device tree with drivers that may match them. For each unattached device in the system, it tries to find matching PNP info in the linker hints and prints modules to load to claim the devices. In --unbound mode, devmatch can look for drivers that have attached to devices in the device tree and have plug and play information, but for which no PNP info exists. This helps find drivers that haven't been converted yet that are in use on this system. In addition, the ability to dump out linker.hints is provided. Future commits will add hooks to devd.conf and rc.d to fully automate using this information.
86 lines
2.8 KiB
Groff
86 lines
2.8 KiB
Groff
.\"
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.\" Copyright (c) 2017 Netflix, Inc
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.\"
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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.
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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 December 25, 2017
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.Dt DEVMATCH 8
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.Os
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.Sh NAME
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.Nm devinfo
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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 aduv
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.Op Fl -all
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.Op Fl -dump
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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 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't 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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.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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.Sh AUTHORS
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.An Warner Losh Aq Mt imp@FreeBSD.org
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