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 21, 2021 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 adhpuv 35.Op Fl -all 36.Op Fl -dump 37.Op Fl -hints Ar file 38.Op Fl -nomatch Ar event 39.Op Fl -unbound 40.Op Fl -verbose 41.Sh DESCRIPTION 42The 43.Nm 44utility, without any arguments, prints all the kernel modules it has 45found for all the unattached, enabled devices in the system. 46.Bl -tag -width 20m 47.It Fl a Fl -all 48Include all devices, not just the ones that are unattached. 49.It Fl d Fl -dump 50Produce a human readable dump of the 51.Pa linker.hints 52file. 53.It Fl h Fl -hints Ar file 54Use the named 55.Ar file 56instead of 57.Pa linker.hints 58guessed from the current module load path. 59.It Fl p Fl -nomatch Ar event 60Parse and use a standard NOMATCH event from 61.Xr devd 8 62for matching instead of searching the device tree. 63.It Fl u Fl -unbound 64Attempt to produce a list of those drivers with PNP info whose driver 65tables with that PNP info can not be found. 66.It Fl v Fl -verbose 67Produce more verbose output. 68.El 69.Sh SEE ALSO 70.Xr rc.conf 5 , 71.Xr devinfo 8 , 72.Xr MODULE_PNP_INFO 9 73.Sh HISTORY 74.Nm 75first appeared in 76.Fx 12.0 . 77.Sh AUTHORS 78.An Warner Losh Aq Mt imp@FreeBSD.org 79.Sh BUGS 80The kernel has hints in it, but we exclude it from the list of modules 81to suggest for unmatched devices. 82We exclude it when suggesting drivers, but include it when looking for 83unbound devices or producing a full dump of 84.Pa linker.hints . 85This can be confusing. 86.Pp 87Some modules are hard links in 88.Pa /boot/kernel 89and will be reported twice. 90.Pp 91The PNP string's attributes are evaluated once per PNP entry on that 92bus rather than once. 93.Pp 94The term PNP is overloaded in FreeBSD. 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