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.Dd February 17, 2017 .Dt PNPBIOS 4 i386 .Os .Sh NAME .Nm pnpbios .Nd introduction to PnP BIOS support .Sh SYNOPSIS .Cd "pnpbios0 at mainbus?" .Cd "XX* at pnpbios0 index ?"
p .Cd options PNPBIOSVERBOSE .Cd options PNPBIOSDEBUG .Sh INTRODUCTION .Nm provides support for finding and attaching devices by extracting information from the PnP BIOS of a machine. .Sh SUPPORTED DEVICES .Nx includes the following .Nm drivers, sorted by driver name:
p l -tag -width x86/fdc(4) -offset indent -compact t Xr com 4 serial communications interface t Xr ess 4 ESS Technology AudioDrive family audio device driver t Xr x86/fdc 4 floppy controller t Xr joy 4 game controller t Xr x86/lpt 4 parallel port driver t Xr pciide 4 PCI IDE controllers driver t Xr pckbc 4 PC keyboard/mouse controller t Xr sb 4 SoundBlaster family audio device driver t Xr wss 4 Windows Sound System hardware driver t Xr ym 4 Yamaha OPL3-SA3 sound driver .El .Sh SEE ALSO .Xr i386/intro 4 , .Xr isa 4 , .Xr pci 4 .Sh HISTORY The .Nm driver appeared in .Nx 1.5 . .Sh BUGS The .Nm bus provides a different way to attach devices than the real buses (e.g., .Xr isa 4 ) . The reason to use .Nm instead of the real bus is that some machines have weird routings of, e.g., interrupts. The exact information about these things can be found in the BIOS, which is why the .Nm bus has a better chance of succeeding with getting it right.
p Many older BIOS implementations do not support PnP, and some newer ones do not follow the standards.