174 lines
5.2 KiB
Groff
174 lines
5.2 KiB
Groff
.\"
|
||
.\" Copyright (c) 1999
|
||
.\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
|
||
.\" All rights reserved.
|
||
.\"
|
||
.\" Redistribution and use in source and binary forms, with or without
|
||
.\" modification, are permitted provided that the following conditions
|
||
.\" are met:
|
||
.\" 1. Redistributions of source code must retain the above copyright
|
||
.\" notice, this list of conditions and the following disclaimer as
|
||
.\" the first lines of this file unmodified.
|
||
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||
.\" notice, this list of conditions and the following disclaimer in the
|
||
.\" documentation and/or other materials provided with the distribution.
|
||
.\"
|
||
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
.\"
|
||
.\" $FreeBSD$
|
||
.\"
|
||
.Dd June 30, 1999
|
||
.Dt VGA 4
|
||
.Os FreeBSD
|
||
.Sh NAME
|
||
.Nm vga
|
||
.Nd
|
||
generic video card interface
|
||
.Sh SYNOPSIS
|
||
.Cd "options VESA"
|
||
.Cd "options VESA_DEBUG=N"
|
||
.Cd "options VGA_ALT_SEQACCESS"
|
||
.Cd "options VGA_NO_FONT_LOADING"
|
||
.Cd "options VGA_NO_MODE_CHANGE"
|
||
.Cd "options VGA_SLOW_IOACCESS"
|
||
.Cd "options VGA_WIDTH90"
|
||
.Cd "device vga0 at isa? port ? conflicts"
|
||
.Sh DESCRIPTION
|
||
The
|
||
.Nm
|
||
driver is a generic video card driver which provides access to
|
||
video cards. This driver is required for the console driver
|
||
.Xr syscons 4 .
|
||
The console driver will call the
|
||
.Nm
|
||
driver to manipulate video hardware (changing video modes, loading font, etc).
|
||
.Pp
|
||
The keyword
|
||
.Em conflicts
|
||
is required, as the video card may use I/O ports in the same range
|
||
as other drivers.
|
||
.Pp
|
||
The
|
||
.Nm
|
||
driver supports the standard video cards: MDA, CGA, EGA and VGA.
|
||
In
|
||
addition, the driver can utilize VESA BIOS extensions if the video card
|
||
supports them.
|
||
VESA support can either be statically included in the kernel
|
||
or can be loaded as a separate module.
|
||
.Pp
|
||
In order to statically link the VESA support to the kernel, the
|
||
.Em VESA
|
||
option (see below) must be defined in the kernel configuration file.
|
||
.Pp
|
||
The
|
||
.Nm vesa
|
||
module can be dynamically loaded into the kernel using
|
||
.Xr kldload 8 .
|
||
.Sh DRIVER CONFIGURATION
|
||
.Ss Kernel Configuration Options
|
||
The following kernel configuration options
|
||
.Pq see Xr config 8
|
||
can be used to control the
|
||
.Nm
|
||
driver.
|
||
These options provide compatibility with certain VGA cards.
|
||
.Bl -tag -width MOUSE
|
||
.It Em VGA_ALT_SEQACCESS
|
||
You may want to try this option if the mouse pointer is not drawn correctly
|
||
or the font does not seem to be loaded properly on the VGA card.
|
||
However, it may cause flicker on some systems.
|
||
.It Em VGA_SLOW_IOACCESS
|
||
Older VGA cards may require this option for proper operation.
|
||
It makes the driver perform byte-wide I/O to VGA registers and
|
||
slow down a little.
|
||
.It Em VGA_WIDTH90
|
||
This option enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60.
|
||
These modes are not always supported by the video card and the display.
|
||
It is highly likely that LCD display cannot work with these modes.
|
||
.El
|
||
.Pp
|
||
The following options add optional features to the driver.
|
||
.Bl -tag -width MOUSE
|
||
.It Em VESA
|
||
Add VESA BIOS support to the driver.
|
||
If the VGA card has the VESA BIOS extension 1.2 or later,
|
||
this option will utilize the VESA BIOS service to switch to high
|
||
resolution modes.
|
||
.It Em VESA_DEBUG=N
|
||
Set the VESA support debug level to
|
||
.Fa N .
|
||
The default value is zero, which suppresses all debugging output.
|
||
.El
|
||
.Pp
|
||
The following options will remove some features from the
|
||
.Nm
|
||
driver and save kernel memory.
|
||
.Bl -tag -width MOUSE
|
||
.It Em VGA_NO_FONT_LOADING
|
||
The
|
||
.Nm
|
||
driver can load software font to EGA and VGA cards.
|
||
This option removes this feature.
|
||
.It Em VGA_NO_MODE_CHANGE
|
||
This option prevents the driver from changing video modes.
|
||
.El
|
||
.\".Sh FILES
|
||
.Sh EXAMPLE
|
||
Your kernel configuration should normally have:
|
||
.Pp
|
||
.Dl "device vga0 at isa? port ? conflicts"
|
||
.Pp
|
||
The following lines should be included in the kernel configuration file
|
||
in order to enable the VESA BIOS Extension support.
|
||
.Pp
|
||
.Dl "options VESA"
|
||
.Dl "device vga0 at isa? port ? conflicts"
|
||
.Pp
|
||
If you do not want VESA support included in the kernel, but
|
||
want to use occasionally, do not add the
|
||
.Em VESA
|
||
option. And load the
|
||
.Nm vesa
|
||
module as desired:
|
||
.Pp
|
||
.Dl kldload vesa
|
||
.Pp
|
||
.\".Sh DIAGNOSTICS
|
||
.\".Sh CAVEATS
|
||
.\".Sh BUGS
|
||
.Sh SEE ALSO
|
||
.Xr vgl 3 ,
|
||
.Xr syscons 4 ,
|
||
.Xr config 8 ,
|
||
.Xr kldload 8 ,
|
||
.Xr kldunload 8 .
|
||
.Sh STANDARD
|
||
.Rs
|
||
.%T "VESA BIOS Extension (VBE)"
|
||
.%A Video Electronics Standards Association
|
||
.Re
|
||
.Sh HISTORY
|
||
The
|
||
.Nm
|
||
driver first appeared in
|
||
.Fx 3.1 .
|
||
.Sh AUTHORS
|
||
The
|
||
.Nm
|
||
driver was written by
|
||
.An S<EFBFBD>ren Schmidt Aq sos@FreeBSD.org
|
||
and
|
||
.An Kazutaka Yokota Aq yokota@FreeBSD.org .
|
||
This manual page was written by
|
||
.An Kazutaka Yokota .
|