Provided by: freebsd-manpages_7.2-1_all
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
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
Clarifications to the Plug and Play ISA Specification, Version 1.0a,
December 10, 1994.
The pnp driver first appeared in FreeBSD 2.2.5. It has been
substantially updated in subsequent versions.
PnP support was originally written for FreeBSD 2.2.5 by Luigi Rizzo,
based on initial work done by Sujal Patel.