1.\" $OpenBSD: pci.4,v 1.403 2023/10/14 06:29:11 jmc Exp $ 2.\" $NetBSD: pci.4,v 1.29 2000/04/01 00:32:23 tsarna Exp $ 3.\" 4.\" Copyright (c) 2000 Theo de Raadt. All rights reserved. 5.\" Copyright (c) 1997 Jason R. Thorpe. All rights reserved. 6.\" Copyright (c) 1997 Jonathan Stone 7.\" All rights reserved. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgements: 19.\" This product includes software developed by Jonathan Stone 20.\" 4. The name of the author may not be used to endorse or promote products 21.\" derived from this software without specific prior written permission 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33.\" 34.Dd $Mdocdate: October 14 2023 $ 35.Dt PCI 4 36.Os 37.Sh NAME 38.Nm pci 39.Nd introduction to PCI bus support 40.Sh SYNOPSIS 41.Cd "# alpha" 42.Cd "pci* at apecs?" 43.Cd "pci* at cia?" 44.Cd "pci* at irongate?" 45.Cd "pci* at lca?" 46.Cd "pci* at tsp?" 47.Cd "pci* at mcpcia?" 48.Pp 49.Cd "# amd64, i386" 50.Cd "pci* at mainbus0" 51.Pp 52.Cd "# arm64" 53.Cd "pci* at acpipci?" 54.Cd "pci* at bcmpcie?" 55.Cd "pci* at dwpcie?" 56.Cd "pci* at mvkpcie?" 57.Cd "pci* at pciecam?" 58.Cd "pci* at rkpcie?" 59.Pp 60.Cd "# armv7" 61.Cd "pci* at mvpcie?" 62.Cd "pci* at pciecam?" 63.Pp 64.Cd "# hppa" 65.Cd "pci* at dino?" 66.Cd "pci* at elroy?" 67.Pp 68.Cd "# landisk" 69.Cd "pci* at shpcic?" 70.Pp 71.Cd "# loongson" 72.Cd "pci* at bonito?" 73.Cd "pci* at htb?" 74.Pp 75.Cd "# macppc" 76.Cd "pci* at mpcpcibr?" 77.Cd "pci* at ht?" 78.Cd "pci* at hpb?" 79.Pp 80.Cd "# octeon" 81.Cd "pci* at octpcie?" 82.Pp 83.Cd "# riscv64" 84.Cd "pci* at dwpcie?" 85.Cd "pci* at pciecam?" 86.Pp 87.Cd "# sparc64" 88.Cd "pci* at psycho?" 89.Cd "pci* at schizo?" 90.Cd "pci* at pyro?" 91.Cd "pci* at vpci?" 92.Pp 93.Cd "# all architectures" 94.Cd "pci* at pchb?" 95.Cd "pci* at ppb?" 96.Sh DESCRIPTION 97The system includes a machine-independent PCI bus subsystem and 98several machine-independent PCI device drivers. 99.Pp 100Note that interrupt mappings on the i386 may require that you configure 101your BIOS to reserve sufficient interrupts as "PCI/ISAPnP" so that there 102are sufficient interrupts remaining to configure the discovered PCI 103devices. 104For more information, see 105.Xr pcibios 4 . 106.Pp 107.Ox 108provides support for the following devices. 109Note that not all architectures support all devices. 110.Ss SCSI host adapters 111.Bl -tag -width 10n -offset ind -compact 112.It Xr adv 4 , Xr adw 4 113AdvanSys PCI SCSI interface 114.It Xr ahc 4 115Adaptec VL/EISA/PCI SCSI interface 116.It Xr ahd 4 117Adaptec PCI/PCI-X AIC79xx-based Ultra320 SCSI interface 118.It Xr iha 4 119Initio INIC-940/950 based PCI SCSI interface 120.It Xr mpi 4 121LSI Logic Fusion-MPT Message Passing Interface 122.It Xr mpii 4 123LSI Logic Fusion-MPT Message Passing Interface II 124.It Xr nvme 4 125Non-Volatile Memory Host Controller Interface 126.It Xr pcscp 4 127Advanced Micro Devices Am53c974 PCscsi-PCI SCSI interface 128.It Xr qla 4 129QLogic ISP2100/2200/2300 Fibre Channel controller 130.It Xr qle 4 131QLogic ISP2400/2500 Fibre Channel controller 132.It Xr qlw 4 133QLogic ISP1000/1020/1x40/1x80/1x160 SCSI controller 134.It Xr siop 4 135LSI/Symbios Logic/NCR 53c8xx SCSI interface 136.It Xr trm 4 137TRM-S1040 based PCI SCSI interface 138.It Xr vmwpvs 4 139VMware Paravirtual SCSI 140.El 141.Ss IDE disk controllers 142.Bl -tag -width "kauaiata(4)" -offset ind -compact 143.It Xr ahci 4 144Advanced Host Controller Interface for Serial ATA 145.It Xr jmb 4 146JMicron JMB36x SATA II and PATA Host Controller 147.It Xr kauaiata 4 148ATA100 HD controller on PCI bus 149.It Xr pciide 4 150PCI IDE controller driver 151.It Xr sili 4 152Silicon Image 3124/3132/3531 SATA controller 153.El 154.Ss RAID and cache controllers 155.Bl -tag -width 10n -offset ind -compact 156.It Xr aac 4 157Adaptec SAS/SATA/SCSI RAID controller 158.It Xr ami 4 159American Megatrends Inc. MegaRAID PATA/SATA/SCSI RAID controller 160.It Xr arc 4 161Areca Technology Corporation SAS/SATA RAID controller 162.It Xr cac 4 163Compaq Smart Array 2/3/4 SCSI RAID controller 164.It Xr ciss 4 165Compaq Smart Array SAS/SATA/SCSI RAID controller 166.It Xr gdt 4 167ICP-Vortex and Intel GDT SATA/SCSI RAID controller 168.It Xr ips 4 169IBM SATA/SCSI ServeRAID controller 170.It Xr mfi 4 171LSI Logic & Dell MegaRAID SAS RAID controller 172.It Xr mfii 4 173LSI Logic MegaRAID SAS Fusion RAID controller 174.It Xr twe 4 1753ware 5000/6000/7000/8000 series PATA/SATA RAID controller 176.El 177.Ss Wired network interfaces 178.Bl -tag -width 10n -offset ind -compact 179.It Xr age 4 180Attansic L1 10/100/1Gb Ethernet device 181.It Xr alc 4 182Atheros AR813x/AR815x/AR816x/AR817x 10/100/1Gb Ethernet device 183.It Xr ale 4 184Atheros AR8121/AR8113/AR8114 10/100/1Gb Ethernet device 185.It Xr aq 4 186Aquantia AQC1xx 1Gb/2.5Gb/5Gb/10Gb PCIe Ethernet device 187.It Xr bce 4 188Broadcom BCM4401 10/100 Ethernet device 189.It Xr bge 4 190Broadcom BCM57xx/BCM590x 10/100/1Gb Ethernet device 191.It Xr bnx 4 192Broadcom NetXtreme II 10/100/1Gb Ethernet device 193.It Xr bnxt 4 194Broadcom NetXtreme-C/E 10Gb/25Gb/40Gb/50Gb Ethernet device 195.It Xr cas 4 196Sun Cassini 10/100/1Gb Ethernet device 197.It Xr dc 4 198DEC/Intel 21140/21142/21143/21145 and clones 10/100 Ethernet device 199.It Xr de 4 200DEC DC21x4x (Tulip) 10/100 Ethernet device 201.It Xr dwqe 4 202Synopsys DesignWare Ethernet Quality-of-Service Controller 203.It Xr em 4 204Intel PRO/1000 10/100/1Gb Ethernet device 205.It Xr ep 4 2063Com EtherLink III and Fast EtherLink III 10/100 Ethernet device 207.It Xr epic 4 208SMC 83C170 (EPIC/100) 10/100 Ethernet device 209.It Xr et 4 210Agere/LSI ET1310 10/100/1Gb Ethernet device 211.It Xr fxp 4 212Intel EtherExpress PRO/100 10/100 Ethernet device 213.It Xr gem 4 214GEM 10/100/1Gb Ethernet device 215.It Xr hme 4 216Sun Happy Meal 10/100 Ethernet device 217.It Xr iavf 4 218Intel Ethernet Adaptive Virtual Function device 219.It Xr igc 4 220Intel I225/I226 1Gb/2.5Gb Ethernet device 221.It Xr ix 4 222Intel 82598/82599/X540/X550 PCI Express 100/1Gb/10Gb Ethernet device 223.It Xr ixgb 4 224Intel PRO/10GbE 10Gb Ethernet device 225.It Xr ixl 4 226Intel Ethernet 700 series Ethernet device 227.It Xr jme 4 228JMicron JMC25x/JMC26x 10/100/1Gb Ethernet device 229.It Xr lge 4 230Level 1 LXT1001 NetCellerator PCI 1Gb Ethernet device 231.It Xr lii 4 232Attansic L2 10/100 Ethernet device 233.It Xr mcx 4 234Mellanox 5th generation Ethernet device 235.It Xr msk 4 236Marvell Yukon-2 10/100/1Gb Ethernet device 237.It Xr mtd 4 238Myson Technology MTD800/MTD803/MTD891 10/100/1Gb Ethernet device 239.It Xr myx 4 240Myricom Myri-10G PCI Express 10Gb Ethernet device 241.It Xr ne 4 242NE2000 and compatible 10/100 Ethernet device 243.It Xr nep 4 244Sun Neptune 10Gb Ethernet device 245.It Xr nfe 4 246NVIDIA nForce MCP 10/100/1Gb Ethernet device 247.It Xr ngbe 4 248WangXun WX1860 PCI Express 10/100/1Gb Ethernet device 249.It Xr nge 4 250National Semiconductor PCI 10/100/1Gb Ethernet device 251.It Xr oce 4 252Emulex OneConnect 10Gb Ethernet device 253.It Xr pcn 4 254AMD PCnet-PCI 10/100 Ethernet device 255.It Xr re 4 256Realtek 8139C+/8169/816xS/811xS/8168/810xE 10/100/1Gb Ethernet device 257.It Xr rge 4 258Realtek 8125/8125B PCI Express 10/100/1Gb/2.5Gb Ethernet device 259.It Xr rl 4 260Realtek 8129/8139 10/100 Ethernet device 261.It Xr se 4 262SiS 190/191 10/100/1Gb Ethernet device 263.It Xr sf 4 264Adaptec AIC-6915 "Starfire" PCI 10/100 Ethernet device 265.It Xr sis 4 266SiS 900, SiS 7016, and NS DP83815/6 10/100 Ethernet device 267.It Xr sk 4 268SysKonnect XMAC II and Marvell Yukon 10/100/1Gb Ethernet device 269.It Xr ste 4 270Sundance Technologies ST201 10/100 Ethernet device 271.It Xr stge 4 272Sundance/Tamarack TC9021 1Gb Ethernet device 273.It Xr tht 4 274Tehuti Networks 10Gb Ethernet device 275.It Xr ti 4 276Alteon Networks Tigon I and II 1Gb Ethernet device 277.It Xr tl 4 278Texas Instruments ThunderLAN 10/100 Ethernet device 279.It Xr txp 4 2803Com 3XP Typhoon/Sidewinder (3CR990) 10/100 Ethernet device 281.It Xr vge 4 282VIA Velocity 10/100/1Gb Ethernet device 283.It Xr vic 4 284VMware VMXnet Virtual Interface Controller device 285.It Xr vmx 4 286VMware VMXNET3 Virtual Interface Controller device 287.It Xr vr 4 288VIA Rhine I/II/III 10/100 Ethernet device 289.It Xr vte 4 290RDC R6040 10/100 Ethernet device 291.It Xr wb 4 292Winbond W89C840F 10/100 Ethernet device 293.It Xr xge 4 294Neterion Xframe/Xframe II 10Gb Ethernet device 295.It Xr xl 4 2963Com EtherLink XL and Fast EtherLink XL 10/100 Ethernet device 297.El 298.Ss Wireless network interfaces 299.Bl -tag -width 10n -offset ind -compact 300.It Xr acx 4 301TI ACX100/ACX111 IEEE 802.11a/b/g wireless network device 302.It Xr an 4 303Aironet Communications 4500/4800 IEEE 802.11FH/b wireless network device 304.It Xr ath 4 305Atheros IEEE 802.11a/b/g wireless network device with GPIO 306.It Xr athn 4 307Atheros IEEE 802.11a/b/g/n wireless network device 308.It Xr atw 4 309ADMtek ADM8211 IEEE 802.11b wireless network device 310.It Xr bwfm 4 311Broadcom and Cypress IEEE 802.11a/ac/ax/b/g/n wireless network device 312.It Xr bwi 4 313Broadcom AirForce IEEE 802.11b/g wireless network device 314.It Xr ipw 4 315Intel PRO/Wireless 2100 IEEE 802.11b wireless network device 316.It Xr iwi 4 317Intel 318PRO/Wireless 2200BG/2225BG/2915ABG IEEE 802.11a/b/g wireless network device 319.It Xr iwn 4 320Intel WiFi Link and Centrino IEEE 802.11a/b/g/n wireless network device 321.It Xr iwm 4 322Intel 7000/8000/9000 IEEE 802.11a/ac/b/g/n wireless network device 323.It Xr iwx 4 324Intel AX200/AX201/AX210/AX211 IEEE 802.11a/ac/ax/b/g/n wireless network device 325.It Xr malo 4 326Marvell Libertas IEEE 802.11b/g wireless network device 327.It Xr pgt 4 328Conexant/Intersil Prism GT Full-MAC IEEE 802.11a/b/g wireless network device 329.It Xr ral 4 330Ralink Technology/MediaTek IEEE 802.11a/b/g/n wireless network device 331.It Xr rtw 4 332Realtek RTL8180L IEEE 802.11b wireless network device 333.It Xr rtwn 4 334Realtek RTL8188CE/RTL8188EE/RTL8192CE/RTL8723AE PCIe IEEE 802.11b/g/n wireless 335network device 336.It Xr wi 4 337WaveLAN/IEEE, PRISM 2-3, and Spectrum24 IEEE 802.11b wireless network 338device 339.It Xr wpi 4 340Intel PRO/Wireless 3945ABG IEEE 802.11a/b/g wireless network device 341.El 342.Ss Cryptography accelerators 343.Bl -tag -width 10n -offset ind -compact 344.It Xr ccp 4 345AMD cryptographic co-processor 346.It Xr glxsb 4 347Geode LX Security Block crypto accelerator 348.El 349.Ss Serial interfaces 350.Bl -tag -width 10n -offset ind -compact 351.It Xr cy 4 352Cyclades Cyclom-4Y, -8Y, and -16Y asynchronous serial communications devices 353.It Xr cz 4 354Cyclades-Z series multi-port serial adapter device 355.It Xr puc 4 356PCI 357.Dq universal 358communications card driver 359.El 360.Ss Display adapters 361.Bl -tag -width 10n -offset ind -compact 362.It Xr astfb 4 363Aspeed BMC frame buffer 364.It Xr gfxp 4 365accelerated color frame buffer 366.It Xr ifb 4 367inextricable frame buffer 368.It Xr machfb 4 369accelerated color frame buffer 370.It radeonfb 4 371accelerated color frame buffer 372.It Xr raptor 4 373accelerated color frame buffer 374.It Xr sisfb 4 375SiS 315 Pro frame buffer 376.It Xr smfb 4 377Silicon Motion frame buffer 378.It Xr sti 4 379HP Standard Text Interface 380.It Xr tga 4 381DECchip 21030 (TGA) graphics driver 382.It Xr vga 4 383VGA graphics cards 384.It Xr vgafb 4 385VGA frame buffer 386.El 387.Ss Audio devices 388.Bl -tag -width 10n -offset ind -compact 389.It Xr auacer 4 390Acer Labs I/O Controller Hub integrated AC'97 audio device 391.It Xr auglx 4 392AMD Geode LX CS5536 integrated AC'97 audio device 393.It Xr auich 4 394Intel ICH integrated AC'97 audio device 395.It Xr auixp 4 396ATI SB200/SB300/SB400/SB600 integrated AC'97 audio device 397.It Xr autri 4 398Trident 4DWAVE-DX/NX, SiS 7018, ALi M5451 audio device 399.It Xr auvia 4 400VIA VT82C686A/VT8233/VT8235/VT8237 integrated AC'97 audio device 401.It Xr azalia 4 402generic High Definition Audio device 403.It Xr clcs 4 404Cirrus Logic CS4280/CS4610/CS4615 audio device 405.It Xr clct 4 406Cirrus Logic CS4281 audio device 407.It Xr cmpci 4 408C-Media CMI8338/CMI8738/CMI8768 PCI audio device 409.It Xr eap 4 410Ensoniq AudioPCI audio device 411.It Xr emu 4 412Creative Labs SBLive!, PCI 512, and Audigy audio device 413.It Xr envy 4 414VIA Envy24 audio device 415.It Xr esa 4 416ESS Technology Allegro-1/Maestro-3 family audio device 417.It Xr eso 4 418ESS Technology Solo-1 PCI AudioDrive audio device 419.It Xr fms 4 420Forte Media FM801 audio device 421.It Xr maestro 4 422ESS Maestro 1 and 2 audio device 423.It Xr neo 4 424NeoMagic 256AV/ZX audio device 425.It Xr sv 4 426S3 SonicVibes audio device 427.It Xr yds 4 428Yamaha DS-XG audio device 429.El 430.Ss Time receiver devices 431.Bl -tag -width 10n -offset ind -compact 432.It Xr mbg 4 433Meinberg Funkuhren timedelta sensor 434.El 435.Ss Radio receiver devices 436.Bl -tag -width 10n -offset ind -compact 437.It Xr fms 4 438Forte Media FM801 audio device 439.El 440.Ss Hardware Sensors 441.Bl -tag -width 10n -offset ind -compact 442.It Xr berkwdt 4 443Berkshire Products watchdog timer device 444.It Xr geodesc 4 445Geode SC1100/SCx200 IAOC watchdog timer device 446.It Xr ichwdt 4 447Intel 6300ESB ICH watchdog timer device 448.It Xr itherm 4 449Intel 3400 temperature sensor 450.It Xr kate 4 451AMD K8 temperature sensor 452.It Xr km 4 453AMD K10 temperature sensor 454.It Xr ksmn 4 455AMD K17 temperature sensor over SMN 456.It Xr pchtemp 4 457Intel PCH temperature sensor 458.It Xr pwdog 4 459Quancom PWDOG1 watchdog timer device 460.It Xr viapm 4 461VIA SMBus controller and VIA VT82C686A/VT8231 hardware monitor 462.It Xr wdt 4 463ICS PCI-WDT500/501 watchdog timer device 464.El 465.Ss Miscellaneous devices 466.Bl -tag -width "amdpcib(4)" -offset ind -compact 467.It Xr alipm 4 468Acer Labs M7101 SMBus controller 469.It Xr amas 4 470AMD memory address map 471.It Xr amdiic 4 472AMD-8111 SMBus controller 473.It Xr amdpcib 4 474AMD-8111 series LPC bridge and timecounter 475.It Xr amdpm 4 476AMD-756/766/768/8111 Power Management and SMBus controller 477.It Xr bktr 4 478Brooktree Bt848/849/878/879 PCI TV tuners and video capture boards 479.It Xr cbb 4 480PCI Yenta compatible CardBus bridges 481.It Xr drm 4 482Direct Rendering Manager device 483.It Xr dwiic 4 484Synopsys DesignWare I2C controller 485.It Xr ehci 4 486USB Enhanced Host Controller Interface 487.It Xr gcu 4 488Intel EP80579 Global Configuration Unit 489.It Xr glxpcib 4 490CS5536 PCI-ISA Bridge with timecounter, watchdog timer, and GPIO 491.It Xr gscpcib 4 492National Semiconductor Geode SC1100 PCI-ISA bridge with GPIO 493.It Xr gscpm 4 494National Semiconductor Geode SC1100 SMI/ACPI module 495.It Xr hpb 4 496HyperTransport-PCI bridge 497.It Xr ichiic 4 498Intel ICH SMBus controller 499.It Xr ichpcib 4 500Intel ICHx/ICHx-M LPC bridges 501.It Xr iosf 4 502Intel OnChip System Fabric device 503.It Xr nviic 4 504NVIDIA nForce2/3/4 SMBus controller 505.It Xr ohci 4 506USB Open Host Controller Interface 507.It Xr pcib 4 508PCI-ISA bridge 509.It Xr pcic 4 510PCI PCMCIA controllers, including the Cirrus Logic GD6729 511.It Xr piixpm 4 512Intel PIIX SMBus controller 513.It Xr ppb 4 514PCI-PCI bridge 515.It Xr rtsx 4 516Realtek SD card reader 517.It Xr sbbc 4 518PCI BootBus Controller 519.It Xr sdhc 4 520SD Host Controller 521.It Xr ssio 4 522National Semiconductor PC87560 Legacy IO 523.It Xr tcpcib 4 524Intel Atom E600 series LPC bridge and watchdog timer 525.It Xr uhci 4 526USB Universal Host Controller Interface 527.It Xr viapm 4 528VIA SMBus controller 529.It Xr virtio 4 530VirtIO support driver 531.It Xr voyager 4 532Silicon Motion Mobile Multimedia Companion Chip 533.It Xr xspd 4 534XenSource Platform Device driver 535.El 536.Sh IOCTLS 537If the kernel is compiled with the 538.Va USER_PCICONF 539kernel option, the following 540.Xr ioctl 2 541calls are supported by the 542.Nm 543driver. 544They are defined in the header file 545.In sys/pciio.h . 546.Bl -tag -width Ds 547.It PCIOCREAD Fa "struct pci_io *" 548This 549.Xr ioctl 2 550reads the PCI configuration registers specified by the passed-in 551.Va pci_io 552structure. 553The 554.Va pci_io 555structure consists of the following fields: 556.Bl -tag -width pi_width 557.It pi_sel 558A 559.Va pcisel 560structure which specifies the bus, slot and function the user would like to 561query. 562.It pi_reg 563The PCI configuration register the user would like to access. 564.It pi_width 565The width, in bytes, of the data the user would like to read. 566This value can be only 4. 567.It pi_data 568The data returned by the kernel. 569.El 570.It PCIOCWRITE Fa "struct pci_io *" 571This 572.Xr ioctl 2 573allows users to write to the PCI device specified in the passed-in 574.Va pci_io 575structure. 576The 577.Va pci_io 578structure is described above. 579The limitations on data width described for 580reading registers, above, also apply to writing PCI configuration registers. 581.It PCIOCGETROM Fa "struct pci_rom *" 582This 583.Xr ioctl 2 584allows users to read the contents of the PCI ROM specified in the passed-in 585.Va pci_rom 586structure. 587The 588.Va pci_rom 589structure consists of the following fields: 590.Bl -tag -width pr_romlen 591.It pr_sel 592A 593.Va pcisel 594structure which specifies the bus, slot and function the user would like to 595query. 596.It pr_romlen 597Size of the buffer to store the contents of the ROM. 598Upon return, this field will contain the size of the ROM 599.It pr_rom 600The address of the buffer to store the contents of the ROM. 601.El 602.Pp 603If the ROM is larger than the specified buffer size, 604.Dv ENOMEM 605will be returned. 606.El 607.Sh FILES 608.Bl -tag -width /dev/pci* -compact 609.It Pa /dev/pci* 610Character device for the 611.Nm 612driver. 613.El 614.Sh SEE ALSO 615.Xr intro 4 , 616.Xr pcidump 8 617.Sh HISTORY 618The machine-independent PCI subsystem appeared in 619.Ox 1.2 . 620