pnp -- support for ``Plug and Play'' (PnP) ISA devices
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
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.
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.
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.
PnP support was originally written for FreeBSD 2.2.5 by Luigi Rizzo,
based on initial work done by
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 [ Back ]