113 lines
3.6 KiB
Groff
113 lines
3.6 KiB
Groff
.\" $NetBSD: tdvfb.4,v 1.7 2012/08/03 21:51:11 wiz Exp $
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.\"
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.\" Copyright (c) 2012 Radoslaw Kujawa
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd August 3, 2012
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.Dt TDVFB 4
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.Os
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.Sh NAME
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.Nm tdvfb
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.Nd 3Dfx Voodoo Graphics / Voodoo 2 framebuffer driver
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.Sh SYNOPSIS
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.Cd "tdvfb* at pci?"
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.Cd "wsdisplay* at tdvfb?"
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.Cd "options TDVFB_CONSOLE"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the graphics cards based on 3Dfx Voodoo Graphics
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(SST-1) and 3Dfx Voodoo2 (CVG) chipsets and provides an interface for the
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machine independent
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.Xr wscons 4
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driver.
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.Pp
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Since both Voodoo Graphics and Voodoo2 were originally designed as a 3D-only
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solutions, most boards do not have any kind of firmware.
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The
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.Nm
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driver is able to do low level initialization (boot) of the board, which means
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that it can be used on all architectures and is truly machine independent.
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However, it also means that driver cannot detect automatically if the card
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is used as a console.
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The
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.Dv TDVFB_CONSOLE
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option is provided and should be set if the
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.Nm
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driver is intended to be used as a console.
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.Sh SEE ALSO
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.Xr genfb 4 ,
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.Xr voodoofb 4 ,
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.Xr wsdisplay 4
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.Rs
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.%A 3Dfx Interactive, Inc.
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.%T Voodoo2 Graphics Engine for 3D Game Acceleration
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.%N Revision 1.16
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.%D December 1, 1999
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.Re
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.Sh HISTORY
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The
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.Nm
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device first appeared in
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.Nx 7.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Radoslaw Kujawa .
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3Dfx Glide 2.x source code, Linux driver by
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.An Ghozlane Toumi
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were used as reference.
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The
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.Xr wscons 4
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attachment code is based mostly on the
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.Xr genfb 4
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driver by
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.An Michael Lorenz .
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.Sh BUGS
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3Dfx Voodoo2 has a simple 2D graphics engine.
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The
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.Nm
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driver has minimal support
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for this engine.
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It is activated only when the card is running in a 16-bit mode
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(this is a hardware limitation).
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.Pp
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Video mode is hard-coded to 800x600 at 60Hz.
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Default bit depth for little
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endian machines is 16-bit, for big endian machines it is 32-bit.
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Resolution and
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depth should be selectable at least via kernel configuration file.
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It is not
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possible to detect what resolutions are supported by the monitor, since Voodoo
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Graphics and Voodoo2 have no DDC interface.
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.Pp
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8-bit depth is not supported by the hardware.
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16-bit depth is supported by the hardware and is the preferred depth, however it
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does not work correctly on big endian machines at the moment (this is a driver
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problem).
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.Pp
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Sometimes the driver fails to detect RAMDAC.
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