AMD Confidential
User Manual September 12h, 2008
74 Chapter 7: Device Configuration
Device models of the Super IO device contain the keyboard, PS/2 mouse, floppy, COM1,
COM2, LPT1, IR, fan, GPIO, MIDI, and joystick devices, as well as PCI support and
control information. The COM1 and COM2 devices create named-pipes "SimNow.Com1"
and "SimNow.Com2” and send all serial communication through these.
Interfaces
The Super IO device model has a single interface connection, and is connected to the
LPC connection of the Southbridge device.
Initialization and Reset State
The following conditions represent the keyboard and/or mouse during initialization and
reset state:
A20 and reset released.
Mouse scaling set to 1.
Mouse resolution set to 4.
Stream mode off.
Mouse sample rate set to 100.
All sticky keys released.
Keyboard output port set to 0xDF.
The floppy is initialized with no drive image present. Reset clears the controller to an idle
state. If an image is loaded, reset does not unload the image.
COM1 and COM2 are initialized with 9600 Baud, no parity, 8-bit words, 1 stop bit, and
interrupts off.
The parallel port initializes with the data and control ports set to zero. Reset clears these
ports to their initial values.
The following devices have no functionality behind them at this time, with the exception
of their configuration registers. These registers are initialized and reset to the values
specified in the Super I/O specification:
IR
GPIO
MIDI
Joystick
Fan
Contents of a BSD
Keyboard and Mouse