SUPERIO(4)             FreeBSD Kernel Interfaces Manual             SUPERIO(4)

NAME
     superio - Super I/O controller and bus driver

SYNOPSIS
     To compile this driver into the kernel, place the following line in your
     kernel configuration file:

           device superio

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           superio_load="YES"

DESCRIPTION
     Super I/O is an I/O controller that combines various low-bandwidth
     devices that can be functionally unrelated otherwise.  A typical Super
     I/O can contain devices such as
     •   a floppy disk controller
     •   a parallel port
     •   a serial port
     •   a PS/2 mouse and keyboard controller
     •   a hardware monitoring controller
     •   a watchdog timer
     •   a controller for general purpose input-output

     The superio driver provides support for devices residing in the Super I/O
     controller that can only be accessed or discovered using the controller's
     interface.  Some of the Super I/O devices have standardized interfaces.
     Such devices either use well-known legacy resources or they are
     advertised via ACPI or both.  They can be configured either using ISA bus
     hints or they are auto-configured by acpi(4).  The superio driver is not
     designed to interact with that kind of devices.  They can be handled by
     their respective drivers without any knowledge of the Super I/O
     specifics.  For instance, fdc(4) provides access to the floppy disk
     controller.

     There are other Super I/O devices that do not have any standardized
     interface.  Drivers for those devices can be written using facilities of
     the superio driver.

     The driver itself attaches to the ISA bus as all supported controllers
     are accessed via LPC I/O ports.

     The superio driver is unusual as it is both a controller driver for a
     variety of Super I/O controllers and a bus driver for supported devices
     in those controllers.

HARDWARE
     The superio driver supports a multitude of Super I/O controllers produced
     by Nuvoton, formerly known as Winbond, and ITE.

SEE ALSO
     superio(9)

HISTORY
     The superio driver was written by Andriy Gapon <avg@FreeBSD.org>.

FreeBSD 13.1-RELEASE-p6        October 11, 2019        FreeBSD 13.1-RELEASE-p6