NAME

       pnp — support for “Plug and Play” (PnP) ISA devices

DESCRIPTION

       The  pnp driver enumerates ISA devices which support “Plug and Play ISA Specification” in the system.  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 PnP ISA device without causing conflict with other devices
       in the system, the device will not be activated and will be unavailable to programs.

SEE ALSO

       pnpbios(4)

STANDARDS

       Intel and Microsoft, Plug and Play ISA Specification, Version 1.0a, May 5, 1994.

       Clarifications to the Plug and Play ISA Specification, Version 1.0a, December 10, 1994.

HISTORY

       The pnp driver first appeared in  FreeBSD  2.2.5.   It  has  been  substantially  updated  in  subsequent
       versions.

AUTHORS

       PnP  support was originally written for FreeBSD 2.2.5 by Luigi Rizzo, based on initial work done by Sujal
       Patel.

CAVEATS

       It is not possible to disable individual  PnP  ISA  devices.   The  pnp  driver  will  find  all  devices
       conforming the PnP ISA specification and try to activate them all.

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

Debian                                         September 20, 2001                                         PNP(4)