1.\" 2.\" Copyright (c) 1999 3.\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer as 11.\" the first lines of this file unmodified. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" 29.Dd June 30, 1999 30.Dt VGA 4 31.Os FreeBSD 32.Sh NAME 33.Nm vga 34.Nd 35generic video card interface 36.Sh SYNOPSIS 37.Cd "options VESA" 38.Cd "options VESA_DEBUG=N" 39.Cd "options VGA_ALT_SEQACCESS" 40.Cd "options VGA_NO_FONT_LOADING" 41.Cd "options VGA_NO_MODE_CHANGE" 42.Cd "options VGA_SLOW_IOACCESS" 43.Cd "options VGA_WIDTH90" 44.Cd "device vga0 at isa? port ? conflicts" 45.Sh DESCRIPTION 46The 47.Nm 48driver is a generic video card driver which provides access to 49video cards. This driver is required for the console driver 50.Xr syscons 4 . 51The console driver will call the 52.Nm 53driver to manipulate video hardware (changing video modes, loading font, etc). 54.Pp 55The keyword 56.Em conflicts 57is required, as the video card may use I/O ports in the same range 58as other drivers. 59.Pp 60The 61.Nm 62driver supports the standard video cards: MDA, CGA, EGA and VGA. In 63addition, the driver can utilize VESA BIOS extensions if the video card 64supports them. VESA support can either be statically included in the kernel 65or can be loaded as a separate module. 66.Pp 67In order to statically link the VESA support to the kernel, the 68.Em VESA 69option (see below) must be defined in the kernel configuration file. 70.Pp 71The 72.Nm vesa 73module can be dynamically loaded into the kernel using 74.Xr kldload 8 . 75.Sh DRIVER CONFIGURATION 76.Ss Kernel Configuration Options 77The following kernel configuration options 78.Pq see Xr config 8 79can be used to control the 80.Nm 81driver. 82These options provide compatibility with certain VGA cards. 83.Bl -tag -width MOUSE 84.It Em VGA_ALT_SEQACCESS 85You may want to try this option if the mouse pointer is not drawn correctly 86or the font does not seem to be loaded properly on the VGA card. 87However, it may cause flicker on some systems. 88.It Em VGA_SLOW_IOACCESS 89Older VGA cards may require this option for proper operation. 90It makes the driver perform byte-wide I/O to VGA registers and 91slow down a little. 92.It Em VGA_WIDTH90 93This option enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60. 94These modes are not always supported by the video card and the display. 95It is highly likely that LCD display cannot work with these modes. 96.El 97.Pp 98The following options add optional features to the driver. 99.Bl -tag -width MOUSE 100.It Em VESA 101Add VESA BIOS support to the driver. 102If the VGA card has the VESA BIOS extension 1.2 or later, 103this option will utilize the VESA BIOS service to switch to high 104resolution modes. 105.It Em VESA_DEBUG=N 106Set the VESA support debug level to 107.Fa N . 108The default value is zero, which suppresses all debugging output. 109.El 110.Pp 111The following options will remove some features from the 112.Nm 113driver and save kernel memory. 114.Bl -tag -width MOUSE 115.It Em VGA_NO_FONT_LOADING 116The 117.Nm 118driver can load software font to EGA and VGA cards. 119This option removes this feature. 120.It Em VGA_NO_MODE_CHANGE 121This option prevents the driver from changing video modes. 122.El 123.\".Sh FILES 124.Sh EXAMPLE 125Your kernel configuration should normally have: 126.Pp 127.Dl "device vga0 at isa? port ? conflicts" 128.Pp 129The following lines should be included in the kernel configuration file 130in order to enable the VESA BIOS Extension support. 131.Pp 132.Dl "options VESA" 133.Dl "device vga0 at isa? port ? conflicts" 134.Pp 135If you do not want VESA support included in the kernel, but 136want to use occasionally, do not add the 137.Em VESA 138option. And load the 139.Nm vesa 140module as desired: 141.Pp 142.Dl kldload vesa 143.Pp 144.\".Sh DIAGNOSTICS 145.\".Sh CAVEATS 146.\".Sh BUGS 147.Sh SEE ALSO 148.Xr syscons 4 , 149.Xr config 8 , 150.Xr kldload 8 , 151.Xr kldunload 8 . 152.Sh STANDARD 153.Rs 154.%T "VESA BIOS Extension (VBE)" 155.%A Video Electronics Standards Association 156.Re 157.Sh HISTORY 158The 159.Nm 160driver first appeared in 161.Fx 3.1 . 162.Sh AUTHORS 163The 164.Nm 165driver was written by 166.An S�ren Schmidt Aq sos@FreeBSD.org 167and 168.An Kazutaka Yokota Aq yokota@FreeBSD.org . 169This manual page was written by 170.An Kazutaka Yokota . 171