108 lines
3.4 KiB
Groff
108 lines
3.4 KiB
Groff
.\" $NetBSD: et.4,v 1.9 2000/02/05 19:50:24 jdc Exp $
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.\"
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.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Julian Coleman.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd Jul 30, 1998
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.Dt ET 4 atari
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.Sh NAME
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.Nm et
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.Nd driver for ET4000 VME graphics cards
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.Sh SYNOPSIS
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.Cd "et0 at vme0"
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.Sh DESCRIPTION
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The
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.Nm ""
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device driver supports VME graphics cards based on the Tseng ET4000 chipset.
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It supports the minimal ioctl's needed to run X11. The 8Kb control registers
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are mapped from offset 0x0 to offset 0x1fff and the 1MB frame buffer is mapped
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from offset 0x400000 to offset 0x4fffff. VGA compatible memory is mapped from
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offset 0xa0000 to offset 0xc0000.
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.Sh HARDWARE
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Cards supported by the
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.Nm
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driver include:
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.Pp
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.Bl -item -compact
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.It
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Crazy Dots II VME graphics card
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.El
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.Sh NOTES
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The clock generator on the Crazy Dots card is an ICS 1394M. Setting the
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clock is done by writing to a register at offset 0x0. This address cannot
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be read. The values that can be written to the register and the associated
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clock are:
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.Bl -column "Value " "Clock" -offset indent
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.It Em Value Ta Em Clock
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.It Li 0x00 Ta
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14318
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.It Li 0x10 Ta
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16257
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.It Li 0x17 Ta
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20000
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.It Li 0x0c Ta
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24000
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.It Li 0x04 Ta
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25175
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.It Li 0x14 Ta
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28332
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.It Li 0x18 Ta
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32514
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.It Li 0x1a Ta
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36000
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.It Li 0x1c Ta
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40000
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.It Li 0x03 Ta
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44900
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.It Li 0x0f Ta
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50000
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.It Li 0x13 Ta
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50344
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.It Li 0x07 Ta
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56644
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.It Li 0x11 Ta
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65028
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.It Li 0x1f Ta
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80000
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.El
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.Sh FILES
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.Bl -tag -width "xxxxxxxxxx" -compact
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.It Pa /dev/etvme
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.El
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.Sh AUTHOR
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.An Julian Coleman
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.Sh BUGS
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The driver does not support a text mode, so cannot be used as a console.
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