171 lines
5.1 KiB
Groff
171 lines
5.1 KiB
Groff
.\"
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.\" Copyright (c) 1999
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.\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
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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 as
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.\" the first lines of this file unmodified.
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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, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 30, 1999
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.Dt VGA 4
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.Os FreeBSD
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.Sh NAME
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.Nm vga
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.Nd
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generic video card interface
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.Sh SYNOPSIS
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.Cd "options VESA"
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.Cd "options VESA_DEBUG=N"
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.Cd "options VGA_ALT_SEQACCESS"
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.Cd "options VGA_NO_FONT_LOADING"
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.Cd "options VGA_NO_MODE_CHANGE"
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.Cd "options VGA_SLOW_IOACCESS"
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.Cd "options VGA_WIDTH90"
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.Cd "device vga0 at isa? port ? conflicts"
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.Sh DESCRIPTION
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The
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.Nm
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driver is a generic video card driver which provides access to
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video cards. This driver is required for the console driver
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.Xr syscons 4 .
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The console driver will call the
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.Nm
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driver to manipulate video hardware (changing video modes, loading font, etc).
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.Pp
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The keyword
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.Em conflicts
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is required, as the video card may use I/O ports in the same range
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as other drivers.
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.Pp
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The
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.Nm
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driver supports the standard video cards: MDA, CGA, EGA and VGA. In
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addition, the driver can utilize VESA BIOS extensions if the video card
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supports them. VESA support can either be statically included in the kernel
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or can be loaded as a separate module.
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.Pp
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In order to statically link the VESA support to the kernel, the
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.Em VESA
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option (see below) must be defined in the kernel configuration file.
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.Pp
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The
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.Nm vesa
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module can be dynamically loaded into the kernel using
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.Xr kldload 8 .
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.Sh DRIVER CONFIGURATION
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.Ss Kernel Configuration Options
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The following kernel configuration options
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.Pq see Xr config 8
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can be used to control the
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.Nm
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driver.
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These options provide compatibility with certain VGA cards.
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.Bl -tag -width MOUSE
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.It Em VGA_ALT_SEQACCESS
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You may want to try this option if the mouse pointer is not drawn correctly
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or the font does not seem to be loaded properly on the VGA card.
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However, it may cause flicker on some systems.
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.It Em VGA_SLOW_IOACCESS
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Older VGA cards may require this option for proper operation.
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It makes the driver perform byte-wide I/O to VGA registers and
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slow down a little.
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.It Em VGA_WIDTH90
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This option enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60.
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These modes are not always supported by the video card and the display.
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It is highly likely that LCD display cannot work with these modes.
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.El
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.Pp
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The following options add optional features to the driver.
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.Bl -tag -width MOUSE
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.It Em VESA
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Add VESA BIOS support to the driver.
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If the VGA card has the VESA BIOS extension 1.2 or later,
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this option will utilize the VESA BIOS service to switch to high
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resolution modes.
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.It Em VESA_DEBUG=N
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Set the VESA support debug level to
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.Fa N .
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The default value is zero, which suppresses all debugging output.
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.El
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.Pp
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The following options will remove some features from the
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.Nm
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driver and save kernel memory.
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.Bl -tag -width MOUSE
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.It Em VGA_NO_FONT_LOADING
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The
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.Nm
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driver can load software font to EGA and VGA cards.
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This option removes this feature.
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.It Em VGA_NO_MODE_CHANGE
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This option prevents the driver from changing video modes.
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.El
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.\".Sh FILES
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.Sh EXAMPLE
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Your kernel configuration should normally have:
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.Pp
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.Dl "device vga0 at isa? port ? conflicts"
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.Pp
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The following lines should be included in the kernel configuration file
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in order to enable the VESA BIOS Extension support.
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.Pp
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.Dl "options VESA"
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.Dl "device vga0 at isa? port ? conflicts"
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.Pp
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If you do not want VESA support included in the kernel, but
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want to use occasionally, do not add the
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.Em VESA
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option. And load the
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.Nm vesa
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module as desired:
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.Pp
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.Dl kldload vesa
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.Pp
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.\".Sh DIAGNOSTICS
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.\".Sh CAVEATS
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.\".Sh BUGS
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.Sh SEE ALSO
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.Xr syscons 4 ,
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.Xr config 8 ,
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.Xr kldload 8 ,
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.Xr kldunload 8 .
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.Sh STANDARD
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.Rs
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.%T "VESA BIOS Extension (VBE)"
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.%A Video Electronics Standards Association
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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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driver first appeared in
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.Fx 3.1 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An S<EFBFBD>ren Schmidt Aq sos@FreeBSD.org
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and
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.An Kazutaka Yokota Aq yokota@FreeBSD.org .
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This manual page was written by
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.An Kazutaka Yokota .
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