NAME    [Toc]    [Back]

     pnp -- support for ``Plug and Play'' (PnP) ISA devices

DESCRIPTION    [Toc]    [Back]

     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.

CAVEAT    [Toc]    [Back]

     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.

SEE ALSO    [Toc]    [Back]

     pnpbios(4)

STANDARDS    [Toc]    [Back]

     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.

AUTHORS    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

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


FreeBSD 5.2.1		      September 20, 2001		 FreeBSD 5.2.1