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: src/share/man/man4/vga.4,v 1.7.2.10 2002/12/20 18:03:05 trhodes Exp $ 28.\" 29.Dd June 30, 1999 30.Dt VGA 4 31.Os 32.Sh NAME 33.Nm vga 34.Nd generic video card interface 35.Sh SYNOPSIS 36.Cd "options VESA" 37.Cd "options VESA_DEBUG=N" 38.Cd "options VGA_ALT_SEQACCESS" 39.Cd "options VGA_NO_FONT_LOADING" 40.Cd "options VGA_NO_MODE_CHANGE" 41.Cd "options VGA_SLOW_IOACCESS" 42.Cd "options VGA_WIDTH90" 43.Cd "device vga0 at isa? port ? 44.Sh DESCRIPTION 45The 46.Nm 47driver is a generic video card driver which provides access to 48video cards. This driver is required for the console driver 49.Xr syscons 4 . 50The console driver will call the 51.Nm 52driver to manipulate video hardware (changing video modes, loading font, etc). 53.Pp 54The 55.Nm 56driver supports the standard video cards: MDA, CGA, EGA and VGA. 57In 58addition, the driver can utilize VESA BIOS extensions if the video card 59supports them. 60VESA support can either be statically included in the kernel 61or can be loaded as a separate module. 62.Pp 63In order to statically link the VESA support to the kernel, the 64.Dv VESA 65option (see below) must be defined in the kernel configuration file. 66.Pp 67The 68.Nm vesa 69module can be dynamically loaded into the kernel using 70.Xr kldload 8 . 71.Sh DRIVER CONFIGURATION 72.Ss Kernel Configuration Options 73The following kernel configuration options 74(see 75.Xr config 8 ) 76can be used to control the 77.Nm 78driver. 79These options provide compatibility with certain VGA cards. 80.Bl -tag -width MOUSE 81.It Dv VGA_ALT_SEQACCESS 82You may want to try this option if the mouse pointer is not drawn correctly 83or the font does not seem to be loaded properly on the VGA card. 84However, it may cause flicker on some systems. 85.It Dv VGA_SLOW_IOACCESS 86Older VGA cards may require this option for proper operation. 87It makes the driver perform byte-wide I/O to VGA registers and 88slow down a little. 89.It Dv VGA_WIDTH90 90This option enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60. 91These modes are not always supported by the video card and the display. 92It is highly likely that LCD display cannot work with these modes. 93.El 94.Pp 95The following options add optional features to the driver. 96.Bl -tag -width MOUSE 97.It Dv VESA 98Add VESA BIOS support to the driver. 99If the VGA card has the VESA BIOS extension 1.2 or later, 100this option will utilize the VESA BIOS service to switch to high 101resolution modes. 102.It Dv VESA_DEBUG=N 103Set the VESA support debug level to 104.Fa N . 105The default value is zero, which suppresses all debugging output. 106.El 107.Pp 108The following options will remove some features from the 109.Nm 110driver and save kernel memory. 111.Bl -tag -width MOUSE 112.It Dv VGA_NO_FONT_LOADING 113The 114.Nm 115driver can load software font to EGA and VGA cards. 116This option removes this feature. 117Note that if you use this option and 118still wish to use the mouse on the console then you must also use the 119.Dv SC_ALT_MOUSE_IMAGE 120option. See 121.Xr syscons 4 . 122.It Dv VGA_NO_MODE_CHANGE 123This option prevents the driver from changing video modes. 124.El 125.\".Sh FILES 126.Sh EXAMPLES 127Your kernel configuration should normally have: 128.Pp 129.Dl "device vga0 at isa? port ? 130.Pp 131The following lines should be included in the kernel configuration file 132in order to enable the VESA BIOS Extension support. 133.Pp 134.Dl "options VESA" 135.Dl "device vga0 at isa? port ? 136.Pp 137If you do not want VESA support included in the kernel, but 138want to use occasionally, do not add the 139.Dv VESA 140option. And load the 141.Nm vesa 142module as desired: 143.Pp 144.Dl kldload vesa 145.Pp 146.\".Sh DIAGNOSTICS 147.\".Sh CAVEATS 148.\".Sh BUGS 149.Sh SEE ALSO 150.Xr vgl 3 , 151.Xr syscons 4 , 152.Xr config 8 , 153.Xr kldload 8 , 154.Xr kldunload 8 155.Sh STANDARDS 156.Rs 157.%T "VESA BIOS Extension (VBE)" 158.%A Video Electronics Standards Association 159.Re 160.Sh HISTORY 161The 162.Nm 163driver first appeared in 164.Fx 3.1 . 165.Sh AUTHORS 166.An -nosplit 167The 168.Nm 169driver was written by 170.An S\(/oren Schmidt Aq sos@FreeBSD.org 171and 172.An Kazutaka Yokota Aq yokota@FreeBSD.org . 173This manual page was written by 174.An Kazutaka Yokota . 175