--- name: "pci" section: "4" platform: "openbsd" package: "man" version: "8.0-current-20261101" release: "OpenBSD 8.0-current (2026-11-01)" platforms: ["linux", "freebsd", "openbsd"] url: "https://carta.tech/man/pci" --- # pci(4) introduction to PCI bus support ## NAME **pci** – introduction to PCI bus support ## SYNOPSIS **# alpha** **pci\* at apecs?** **pci\* at cia?** **pci\* at irongate?** **pci\* at lca?** **pci\* at tsp?** **pci\* at mcpcia?** **# amd64, i386** **pci\* at mainbus0** **# arm64** **pci\* at acpipci?** **pci\* at bcmpcie?** **pci\* at dwpcie?** **pci\* at mvkpcie?** **pci\* at pciecam?** **pci\* at rkpcie?** **# armv7** **pci\* at mvpcie?** **pci\* at pciecam?** **# hppa** **pci\* at dino?** **pci\* at elroy?** **# landisk** **pci\* at shpcic?** **# loongson** **pci\* at bonito?** **pci\* at htb?** **# macppc** **pci\* at mpcpcibr?** **pci\* at ht?** **pci\* at hpb?** **# octeon** **pci\* at octpcie?** **# riscv64** **pci\* at dwpcie?** **pci\* at pciecam?** **# sparc64** **pci\* at psycho?** **pci\* at schizo?** **pci\* at pyro?** **pci\* at vpci?** **# all architectures** **pci\* at pchb?** **pci\* at ppb?** ## DESCRIPTION The system includes a machine-independent PCI bus subsystem and several machine-independent PCI device drivers. Note that interrupt mappings on the i386 may require that you configure your BIOS to reserve sufficient interrupts as "PCI/ISAPnP" so that there are sufficient interrupts remaining to configure the discovered PCI devices. For more information, see [pcibios(4)](/man/pcibios/4.md). OpenBSD provides support for the following devices. Note that not all architectures support all devices. ### SCSI host adapters - [adv(4)](/man/adv/4.md), [adw(4)](/man/adw/4.md) AdvanSys PCI SCSI interface - [ahc(4)](/man/ahc/4.md) Adaptec VL/EISA/PCI SCSI interface - [ahd(4)](/man/ahd/4.md) Adaptec PCI/PCI-X AIC79xx-based Ultra320 SCSI interface - [iha(4)](/man/iha/4.md) Initio INIC-940/950 based PCI SCSI interface - [mpi(4)](/man/mpi/4.md) LSI Logic Fusion-MPT Message Passing Interface - [mpii(4)](/man/mpii/4.md) LSI Logic Fusion-MPT Message Passing Interface II - [nvme(4)](/man/nvme/4.md) Non-Volatile Memory Host Controller Interface - [pcscp(4)](/man/pcscp/4.md) Advanced Micro Devices Am53c974 PCscsi-PCI SCSI interface - [qla(4)](/man/qla/4.md) QLogic ISP2100/2200/2300 Fibre Channel controller - [qle(4)](/man/qle/4.md) QLogic ISP2400/2500 Fibre Channel controller - [qlw(4)](/man/qlw/4.md) QLogic ISP1000/1020/1x40/1x80/1x160 SCSI controller - [siop(4)](/man/siop/4.md) LSI/Symbios Logic/NCR 53c8xx SCSI interface - [trm(4)](/man/trm/4.md) TRM-S1040 based PCI SCSI interface - [ufshci(4)](/man/ufshci/4.md) Universal Flash Storage Host Controller Interface - [vmwpvs(4)](/man/vmwpvs/4.md) VMware Paravirtual SCSI ### IDE disk controllers - [ahci(4)](/man/ahci/4.md) Advanced Host Controller Interface for Serial ATA - [jmb(4)](/man/jmb/4.md) JMicron JMB36x SATA II and PATA Host Controller - [kauaiata(4)](/man/kauaiata/4.md) ATA100 HD controller on PCI bus - [pciide(4)](/man/pciide/4.md) PCI IDE controller driver - [sili(4)](/man/sili/4.md) Silicon Image 3124/3132/3531 SATA controller ### RAID and cache controllers - [aac(4)](/man/aac/4.md) Adaptec SAS/SATA/SCSI RAID controller - [ami(4)](/man/ami/4.md) American Megatrends Inc. MegaRAID PATA/SATA/SCSI RAID controller - [arc(4)](/man/arc/4.md) Areca Technology Corporation SAS/SATA RAID controller - [cac(4)](/man/cac/4.md) Compaq Smart Array 2/3/4 SCSI RAID controller - [ciss(4)](/man/ciss/4.md) Compaq Smart Array SAS/SATA/SCSI RAID controller - [gdt(4)](/man/gdt/4.md) ICP-Vortex and Intel GDT SATA/SCSI RAID controller - [ips(4)](/man/ips/4.md) IBM SATA/SCSI ServeRAID controller - [mfi(4)](/man/mfi/4.md) LSI Logic & Dell MegaRAID SAS RAID controller - [mfii(4)](/man/mfii/4.md) LSI Logic MegaRAID SAS Fusion RAID controller - [twe(4)](/man/twe/4.md) 3ware 5000/6000/7000/8000 series PATA/SATA RAID controller ### Wired network interfaces - [age(4)](/man/age/4.md) Attansic L1 10/100/1Gb Ethernet device - [alc(4)](/man/alc/4.md) Atheros AR813x/AR815x/AR816x/AR817x 10/100/1Gb Ethernet device - [ale(4)](/man/ale/4.md) Atheros AR8121/AR8113/AR8114 10/100/1Gb Ethernet device - [aq(4)](/man/aq/4.md) Aquantia AQC1xx 1Gb/2.5Gb/5Gb/10Gb PCIe Ethernet device - [bce(4)](/man/bce/4.md) Broadcom BCM4401 10/100 Ethernet device - [bge(4)](/man/bge/4.md) Broadcom BCM57xx/BCM590x 10/100/1Gb Ethernet device - [bnx(4)](/man/bnx/4.md) Broadcom NetXtreme II 10/100/1Gb Ethernet device - [bnxt(4)](/man/bnxt/4.md) Broadcom NetXtreme-C/E 10Gb/25Gb/40Gb/50Gb Ethernet device - [cas(4)](/man/cas/4.md) Sun Cassini 10/100/1Gb Ethernet device - [dc(4)](/man/dc/4.md) DEC/Intel 21140/21142/21143/21145 and clones 10/100 Ethernet device - [de(4)](/man/de/4.md) DEC DC21x4x (Tulip) 10/100 Ethernet device - [dwqe(4)](/man/dwqe/4.md) Synopsys DesignWare Ethernet Quality-of-Service Controller - [em(4)](/man/em/4.md) Intel PRO/1000 10/100/1Gb Ethernet device - [ep(4)](/man/ep/4.md) 3Com EtherLink III and Fast EtherLink III 10/100 Ethernet device - [epic(4)](/man/epic/4.md) SMC 83C170 (EPIC/100) 10/100 Ethernet device - [et(4)](/man/et/4.md) Agere/LSI ET1310 10/100/1Gb Ethernet device - [fxp(4)](/man/fxp/4.md) Intel EtherExpress PRO/100 10/100 Ethernet device - [gem(4)](/man/gem/4.md) GEM 10/100/1Gb Ethernet device - [hme(4)](/man/hme/4.md) Sun Happy Meal 10/100 Ethernet device - [iavf(4)](/man/iavf/4.md) Intel Ethernet adaptive virtual function device - [ice(4)](/man/ice/4.md) Intel Ethernet 800 series PCI Express 1Gb/10Gb/25Gb/50Gb/100Gb Ethernet device - [igc(4)](/man/igc/4.md) Intel I225/I226 1Gb/2.5Gb Ethernet device - [ix(4)](/man/ix/4.md) Intel 82598/82599/X540/X550 PCI Express 100/1Gb/10Gb Ethernet device - [ixgb(4)](/man/ixgb/4.md) Intel PRO/10GbE 10Gb Ethernet device - [ixl(4)](/man/ixl/4.md) Intel Ethernet 700 series Ethernet device - [ixv(4)](/man/ixv/4.md) Intel 10Gb Ethernet virtual function device - [jme(4)](/man/jme/4.md) JMicron JMC25x/JMC26x 10/100/1Gb Ethernet device - [lge(4)](/man/lge/4.md) Level 1 LXT1001 NetCellerator PCI 1Gb Ethernet device - [lii(4)](/man/lii/4.md) Attansic L2 10/100 Ethernet device - [mcx(4)](/man/mcx/4.md) Mellanox 5th generation Ethernet device - [msk(4)](/man/msk/4.md) Marvell Yukon-2 10/100/1Gb Ethernet device - [mtd(4)](/man/mtd/4.md) Myson Technology MTD800/MTD803/MTD891 10/100/1Gb Ethernet device - [myx(4)](/man/myx/4.md) Myricom Myri-10G PCI Express 10Gb Ethernet device - [ne(4)](/man/ne/4.md) NE2000 and compatible 10/100 Ethernet device - [nep(4)](/man/nep/4.md) Sun Neptune 10Gb Ethernet device - [nfe(4)](/man/nfe/4.md) NVIDIA nForce MCP 10/100/1Gb Ethernet device - [ngbe(4)](/man/ngbe/4.md) WangXun WX1860 PCI Express 10/100/1Gb Ethernet device - [nge(4)](/man/nge/4.md) National Semiconductor PCI 10/100/1Gb Ethernet device - [oce(4)](/man/oce/4.md) Emulex OneConnect 10Gb Ethernet device - [pcn(4)](/man/pcn/4.md) AMD PCnet-PCI 10/100 Ethernet device - [re(4)](/man/re/4.md) Realtek 8139C+/8169/816xS/811xS/8168/810xE 10/100/1Gb Ethernet device - [rge(4)](/man/rge/4.md) Realtek 8125/8126/8127 PCI Express 10/100/1Gb/2.5Gb/5Gb/10Gb Ethernet device - [rl(4)](/man/rl/4.md) Realtek 8129/8139 10/100 Ethernet device - [se(4)](/man/se/4.md) SiS 190/191 10/100/1Gb Ethernet device - [sf(4)](/man/sf/4.md) Adaptec AIC-6915 "Starfire" PCI 10/100 Ethernet device - [sis(4)](/man/sis/4.md) SiS 900, SiS 7016, and NS DP83815/6 10/100 Ethernet device - [sk(4)](/man/sk/4.md) SysKonnect XMAC II and Marvell Yukon 10/100/1Gb Ethernet device - [ste(4)](/man/ste/4.md) Sundance Technologies ST201 10/100 Ethernet device - [stge(4)](/man/stge/4.md) Sundance/Tamarack TC9021 1Gb Ethernet device - [tht(4)](/man/tht/4.md) Tehuti Networks 10Gb Ethernet device - [ti(4)](/man/ti/4.md) Alteon Networks Tigon I and II 1Gb Ethernet device - [tl(4)](/man/tl/4.md) Texas Instruments ThunderLAN 10/100 Ethernet device - [txp(4)](/man/txp/4.md) 3Com 3XP Typhoon/Sidewinder (3CR990) 10/100 Ethernet device - [vge(4)](/man/vge/4.md) VIA Velocity 10/100/1Gb Ethernet device - [vic(4)](/man/vic/4.md) VMware VMXnet Virtual Interface Controller device - [vmx(4)](/man/vmx/4.md) VMware VMXNET3 Virtual Interface Controller device - [vr(4)](/man/vr/4.md) VIA Rhine I/II/III 10/100 Ethernet device - [vte(4)](/man/vte/4.md) RDC R6040 10/100 Ethernet device - [wb(4)](/man/wb/4.md) Winbond W89C840F 10/100 Ethernet device - [xge(4)](/man/xge/4.md) Neterion Xframe/Xframe II 10Gb Ethernet device - [xl(4)](/man/xl/4.md) 3Com EtherLink XL and Fast EtherLink XL 10/100 Ethernet device ### Wireless network interfaces - [acx(4)](/man/acx/4.md) TI ACX100/ACX111 IEEE 802.11a/b/g wireless network device - [an(4)](/man/an/4.md) Aironet Communications 4500/4800 IEEE 802.11FH/b wireless network device - [ath(4)](/man/ath/4.md) Atheros IEEE 802.11a/b/g wireless network device with GPIO - [athn(4)](/man/athn/4.md) Atheros IEEE 802.11a/b/g/n wireless network device - [atw(4)](/man/atw/4.md) ADMtek ADM8211 IEEE 802.11b wireless network device - [bwfm(4)](/man/bwfm/4.md) Broadcom and Cypress IEEE 802.11a/ac/ax/b/g/n wireless network device - [bwi(4)](/man/bwi/4.md) Broadcom AirForce IEEE 802.11b/g wireless network device - [ipw(4)](/man/ipw/4.md) Intel PRO/Wireless 2100 IEEE 802.11b wireless network device - [iwi(4)](/man/iwi/4.md) Intel PRO/Wireless 2200BG/2225BG/2915ABG IEEE 802.11a/b/g wireless network device - [iwn(4)](/man/iwn/4.md) Intel WiFi Link and Centrino IEEE 802.11a/b/g/n wireless network device - [iwm(4)](/man/iwm/4.md) Intel 7000/8000/9000 IEEE 802.11a/ac/b/g/n wireless network device - [iwx(4)](/man/iwx/4.md) Intel AX200/AX201/AX210/AX211 IEEE 802.11a/ac/ax/b/g/n wireless network device - [malo(4)](/man/malo/4.md) Marvell Libertas IEEE 802.11b/g wireless network device - [mwx(4)](/man/mwx/4.md) MediaTek IEEE 802.11a/ac/ax/b/g/n wireless network device - [pgt(4)](/man/pgt/4.md) Conexant/Intersil Prism GT Full-MAC IEEE 802.11a/b/g wireless network device - [qwx(4)](/man/qwx/4.md) Qualcomm IEEE 802.11a/ac/ax/b/g/n wireless network device - [qwz(4)](/man/qwz/4.md) Qualcomm IEEE 802.11a/ac/ax/b/g/n wireless network device - [ral(4)](/man/ral/4.md) Ralink Technology/MediaTek IEEE 802.11a/b/g/n wireless network device - [rtw(4)](/man/rtw/4.md) Realtek RTL8180L IEEE 802.11b wireless network device - [rtwn(4)](/man/rtwn/4.md) Realtek RTL8188CE/RTL8188EE/RTL8192CE/RTL8723AE PCIe IEEE 802.11b/g/n wireless network device - [wi(4)](/man/wi/4.md) WaveLAN/IEEE, PRISM 2-3, and Spectrum24 IEEE 802.11b wireless network device - [wpi(4)](/man/wpi/4.md) Intel PRO/Wireless 3945ABG IEEE 802.11a/b/g wireless network device ### Cryptography accelerators - [ccp(4)](/man/ccp/4.md) AMD cryptographic co-processor - [glxsb(4)](/man/glxsb/4.md) Geode LX Security Block crypto accelerator ### Serial interfaces - [cy(4)](/man/cy/4.md) Cyclades Cyclom-4Y, -8Y, and -16Y asynchronous serial communications devices - [cz(4)](/man/cz/4.md) Cyclades-Z series multi-port serial adapter device - [puc(4)](/man/puc/4.md) PCI “universal” communications card driver ### Display adapters - [astfb(4)](/man/astfb/4.md) Aspeed BMC frame buffer - [gfxp(4)](/man/gfxp/4.md) accelerated color frame buffer - [ifb(4)](/man/ifb/4.md) inextricable frame buffer - [machfb(4)](/man/machfb/4.md) accelerated color frame buffer - [radeonfb(4)](/man/radeonfb/4.md) accelerated color frame buffer - [raptor(4)](/man/raptor/4.md) accelerated color frame buffer - [sti(4)](/man/sti/4.md) HP Standard Text Interface - [tga(4)](/man/tga/4.md) DECchip 21030 (TGA) graphics driver - [vga(4)](/man/vga/4.md) VGA graphics cards - [vgafb(4)](/man/vgafb/4.md) VGA frame buffer ### Audio devices - [auacer(4)](/man/auacer/4.md) Acer Labs I/O Controller Hub integrated AC'97 audio device - [auglx(4)](/man/auglx/4.md) AMD Geode LX CS5536 integrated AC'97 audio device - [auich(4)](/man/auich/4.md) Intel ICH integrated AC'97 audio device - [auixp(4)](/man/auixp/4.md) ATI SB200/SB300/SB400/SB600 integrated AC'97 audio device - [autri(4)](/man/autri/4.md) Trident 4DWAVE-DX/NX, SiS 7018, ALi M5451 audio device - [auvia(4)](/man/auvia/4.md) VIA VT82C686A/VT8233/VT8235/VT8237 integrated AC'97 audio device - [azalia(4)](/man/azalia/4.md) generic High Definition Audio device - [clcs(4)](/man/clcs/4.md) Cirrus Logic CS4280/CS4610/CS4615 audio device - [clct(4)](/man/clct/4.md) Cirrus Logic CS4281 audio device - [cmpci(4)](/man/cmpci/4.md) C-Media CMI8338/CMI8738/CMI8768 PCI audio device - [eap(4)](/man/eap/4.md) Ensoniq AudioPCI audio device - [emu(4)](/man/emu/4.md) Creative Labs SBLive!, PCI 512, and Audigy audio device - [envy(4)](/man/envy/4.md) VIA Envy24 audio device - [esa(4)](/man/esa/4.md) ESS Technology Allegro-1/Maestro-3 family audio device - [eso(4)](/man/eso/4.md) ESS Technology Solo-1 PCI AudioDrive audio device - [fms(4)](/man/fms/4.md) Forte Media FM801 audio device - [maestro(4)](/man/maestro/4.md) ESS Maestro 1 and 2 audio device - [neo(4)](/man/neo/4.md) NeoMagic 256AV/ZX audio device - [sv(4)](/man/sv/4.md) S3 SonicVibes audio device - [yds(4)](/man/yds/4.md) Yamaha DS-XG audio device ### Time receiver devices - [mbg(4)](/man/mbg/4.md) Meinberg Funkuhren timedelta sensor ### Radio receiver devices - [fms(4)](/man/fms/4.md) Forte Media FM801 audio device ### Hardware Sensors - [berkwdt(4)](/man/berkwdt/4.md) Berkshire Products watchdog timer device - [geodesc(4)](/man/geodesc/4.md) Geode SC1100/SCx200 IAOC watchdog timer device - [ichwdt(4)](/man/ichwdt/4.md) Intel 6300ESB ICH watchdog timer device - [itherm(4)](/man/itherm/4.md) Intel 3400 temperature sensor - [kate(4)](/man/kate/4.md) AMD K8 temperature sensor - [km(4)](/man/km/4.md) AMD K10 temperature sensor - [ksmn(4)](/man/ksmn/4.md) AMD K17 temperature sensor over SMN - [pchtemp(4)](/man/pchtemp/4.md) Intel PCH temperature sensor - [pwdog(4)](/man/pwdog/4.md) Quancom PWDOG1 watchdog timer device - [viapm(4)](/man/viapm/4.md) VIA SMBus controller and VIA VT82C686A/VT8231 hardware monitor - [wdt(4)](/man/wdt/4.md) ICS PCI-WDT500/501 watchdog timer device ### Miscellaneous devices - [alipm(4)](/man/alipm/4.md) Acer Labs M7101 SMBus controller - [amas(4)](/man/amas/4.md) AMD memory address map - [amdiic(4)](/man/amdiic/4.md) AMD-8111 SMBus controller - [amdpcib(4)](/man/amdpcib/4.md) AMD-8111 series LPC bridge and timecounter - [amdpm(4)](/man/amdpm/4.md) AMD-756/766/768/8111 Power Management and SMBus controller - [bktr(4)](/man/bktr/4.md) Brooktree Bt848/849/878/879 PCI TV tuners and video capture boards - [cbb(4)](/man/cbb/4.md) PCI Yenta compatible CardBus bridges - [drm(4)](/man/drm/4.md) Direct Rendering Manager device - [dwiic(4)](/man/dwiic/4.md) Synopsys DesignWare I2C controller - [ehci(4)](/man/ehci/4.md) USB Enhanced Host Controller Interface - [gcu(4)](/man/gcu/4.md) Intel EP80579 Global Configuration Unit - [glxpcib(4)](/man/glxpcib/4.md) CS5536 PCI-ISA Bridge with timecounter, watchdog timer, and GPIO - [gscpcib(4)](/man/gscpcib/4.md) National Semiconductor Geode SC1100 PCI-ISA bridge with GPIO - [gscpm(4)](/man/gscpm/4.md) National Semiconductor Geode SC1100 SMI/ACPI module - [hpb(4)](/man/hpb/4.md) HyperTransport-PCI bridge - [ichiic(4)](/man/ichiic/4.md) Intel ICH SMBus controller - [ichpcib(4)](/man/ichpcib/4.md) Intel ICHx/ICHx-M LPC bridges - [iosf(4)](/man/iosf/4.md) Intel OnChip System Fabric device - [nviic(4)](/man/nviic/4.md) NVIDIA nForce2/3/4 SMBus controller - [ohci(4)](/man/ohci/4.md) USB Open Host Controller Interface - [pcib(4)](/man/pcib/4.md) PCI-ISA bridge - [pcic(4)](/man/pcic/4.md) PCI PCMCIA controllers, including the Cirrus Logic GD6729 - [piixpm(4)](/man/piixpm/4.md) Intel PIIX SMBus controller - [ppb(4)](/man/ppb/4.md) PCI-PCI bridge - [rtsx(4)](/man/rtsx/4.md) Realtek SD card reader - [sbbc(4)](/man/sbbc/4.md) PCI BootBus Controller - [sdhc(4)](/man/sdhc/4.md) SD Host Controller - [ssio(4)](/man/ssio/4.md) National Semiconductor PC87560 Legacy IO - [tcpcib(4)](/man/tcpcib/4.md) Intel Atom E600 series LPC bridge and watchdog timer - [uhci(4)](/man/uhci/4.md) USB Universal Host Controller Interface - [viapm(4)](/man/viapm/4.md) VIA SMBus controller - [virtio(4)](/man/virtio/4.md) VirtIO support driver - [xspd(4)](/man/xspd/4.md) XenSource Platform Device driver ## IOCTLS If the kernel is compiled with the *USER\_PCICONF* kernel option, the following [ioctl(2)](/man/ioctl/2.md) calls are supported by the **pci** driver. They are defined in the header file ⟨sys/pciio.h⟩. - PCIOCREAD *struct pci\_io \** This [ioctl(2)](/man/ioctl/2.md) reads the PCI configuration registers specified by the passed-in *pci\_io* structure. The *pci\_io* structure consists of the following fields: - pi\_sel A *pcisel* structure which specifies the bus, slot and function the user would like to query. - pi\_reg The PCI configuration register the user would like to access. - pi\_width The width, in bytes, of the data the user would like to read. This value can be only 4. - pi\_data The data returned by the kernel. - PCIOCWRITE *struct pci\_io \** This [ioctl(2)](/man/ioctl/2.md) allows users to write to the PCI device specified in the passed-in *pci\_io* structure. The *pci\_io* structure is described above. The limitations on data width described for reading registers, above, also apply to writing PCI configuration registers. - PCIOCGETROM *struct pci\_rom \** This [ioctl(2)](/man/ioctl/2.md) allows users to read the contents of the PCI ROM specified in the passed-in *pci\_rom* structure. The *pci\_rom* structure consists of the following fields: - pr\_sel A *pcisel* structure which specifies the bus, slot and function the user would like to query. - pr\_romlen Size of the buffer to store the contents of the ROM. Upon return, this field will contain the size of the ROM - pr\_rom The address of the buffer to store the contents of the ROM. If the ROM is larger than the specified buffer size, ENOMEM will be returned. ## FILES - */dev/pci\** Character device for the **pci** driver. ## SEE ALSO [intro(4)](/man/intro/4.md), [pcidump(8)](/man/pcidump/8.md) ## HISTORY The machine-independent PCI subsystem appeared in OpenBSD 1.2.