1.\" 2.\" Copyright (c) 2017 Netflix, Inc. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 14.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16.\" IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 17.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23.\" 24.\" $FreeBSD$ 25.\" 26.Dd November 3, 2022 27.Dt DEVMATCH 8 28.Os 29.Sh NAME 30.Nm devmatch 31.Nd print information about unattached devices 32.Sh SYNOPSIS 33.Nm 34.Op Fl a | -all 35.Op Fl d | -dump 36.Op Oo Fl h | -hints Oc Ar file 37.Op Oo Fl p | -nomatch Oc Ar event 38.Op Fl u | -unbound 39.Op Fl v | -verbose 40.Sh DESCRIPTION 41The 42.Nm 43utility, without any arguments, prints all the kernel modules it has 44found for all the unattached, enabled devices in the system. 45.Bl -tag -width 20m 46.It Fl a Fl -all 47Include all devices, not just the ones that are unattached. 48.It Fl d Fl -dump 49Produce a human readable dump of the 50.Pa linker.hints 51file. 52.It Fl h Fl -hints Ar file 53Use the named 54.Ar file 55instead of 56.Pa linker.hints 57guessed from the current module load path. 58.It Fl p Fl -nomatch Ar event 59Parse and use a standard NOMATCH event from 60.Xr devd 8 61for matching instead of searching the device tree. 62.It Fl u Fl -unbound 63Attempt to produce a list of those drivers with PNP info whose driver 64tables with that PNP info cannot be found. 65.It Fl v Fl -verbose 66Produce more verbose output. 67.El 68.Sh SEE ALSO 69.Xr rc.conf 5 , 70.Xr devinfo 8 , 71.Xr MODULE_PNP_INFO 9 72.Sh HISTORY 73.Nm 74first appeared in 75.Fx 12.0 . 76.Sh AUTHORS 77.An Warner Losh Aq Mt imp@FreeBSD.org 78.Sh BUGS 79The kernel has hints in it, but we exclude it from the list of modules 80to suggest for unmatched devices. 81We exclude it when suggesting drivers, but include it when looking for 82unbound devices or producing a full dump of 83.Pa linker.hints . 84This can be confusing. 85.Pp 86Some modules are hard links in 87.Pa /boot/kernel 88and will be reported twice. 89.Pp 90The PNP string's attributes are evaluated once per PNP entry on that 91bus rather than once. 92.Pp 93The term PNP is overloaded in 94.Fx . 95It means, generically, the identifying data the bus provides about a 96device. 97While this include old ISA PNP identifiers, it also includes the 98logical equivalent in USB, PCI, and others. 99.Pp 100Many drivers currently lack proper PNP table decorations and need to 101be updated. 102