bionic (4) pnpbios.4freebsd.gz

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NAME
     pnpbios — support for embedded devices on the motherboard


DESCRIPTION
     The pnpbios driver enumerates embedded ISA devices on the motherboard whose BIOS supports “Plug and Play
     BIOS Specification”.  It assigns ISA bus resources (interrupt line, DMA channel, I/O ports, and memory
     region) to each device and activates it.

     If it cannot assign necessary resources to a device without causing conflict with other devices in the
     system, the device will not be activated and will be unavailable to programs.


SEE ALSO
     pnp(4)


STANDARDS
     Compaq, Phenix, and Intel, Plug and Play BIOS Specification Version 1.0A, May 5, 1994.

     Compaq, Phenix, and Intel, Plug and Play BIOS CLARIFICATION Paper for Plug and Play BIOS Specification
     Version 1.0A, October 6, 1994.


HISTORY
     The pnpbios driver first appeared in FreeBSD 4.0.


AUTHORS
     The pnpbios driver was written by Mike Smith.


CAVEATS
     There is no explicit way to disable individual embedded devices.  The pnpbios driver will find all devices
     reported by the “Plug and Play (PnP)” BIOS and try to activate them all.

     There is no way to explicitly assign particular resource to a device.  The resource assignment is fully
     automatic and there is no provision for manual override.