— support for “Plug and
Play” (PnP) ISA devices
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.
It is not possible to disable individual PnP ISA devices. The
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
Microsoft, Plug and Play ISA
Specification, Version 1.0a, May 5,
Clarifications to the Plug and Play ISA
Specification, Version 1.0a, December 10,
driver first appeared in FreeBSD
. It has been substantially updated in subsequent versions.
PnP support was originally written for FreeBSD 2.2.5
, based on initial work done by