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 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 vga" 44.Pp 45In 46.Pa /boot/device.hints : 47.Cd hint.vga.0.at="isa" 48.Sh DESCRIPTION 49The 50.Nm 51driver is a generic video card driver which provides access to 52video cards. 53This driver is required for the console driver 54.Xr syscons 4 . 55The console driver will call the 56.Nm 57driver to manipulate video hardware (changing video modes, loading font, etc). 58.Pp 59The 60.Nm 61driver supports the standard video cards: MDA, CGA, EGA and VGA. 62In 63addition, the driver can utilize VESA BIOS extensions if the video card 64supports them. 65VESA support can either be statically included in the kernel 66or can be loaded as a separate module. 67.Pp 68In order to statically link the VESA support to the kernel, the 69.Dv VESA 70option (see below) must be defined in the kernel configuration file. 71.Pp 72The 73.Nm vesa 74module can be dynamically loaded into the kernel using 75.Xr kldload 8 . 76.Sh DRIVER CONFIGURATION 77.Ss Kernel Configuration Options 78The following kernel configuration options 79(see 80.Xr config 8 ) 81can be used to control the 82.Nm 83driver. 84These options provide compatibility with certain VGA cards. 85.Bl -tag -width MOUSE 86.It Dv VGA_ALT_SEQACCESS 87You may want to try this option if the mouse pointer is not drawn correctly 88or the font does not seem to be loaded properly on the VGA card. 89However, it may cause flicker on some systems. 90.It Dv VGA_SLOW_IOACCESS 91Older VGA cards may require this option for proper operation. 92It makes the driver perform byte-wide I/O to VGA registers and 93slow down a little. 94.It Dv VGA_WIDTH90 95This option enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60. 96These modes are not always supported by the video card and the display. 97It is highly likely that LCD display cannot work with these modes. 98.El 99.Pp 100The following options add optional features to the driver. 101.Bl -tag -width MOUSE 102.It Dv VESA 103Add VESA BIOS support to the driver. 104If the VGA card has the VESA BIOS extension 1.2 or later, 105this option will utilize the VESA BIOS service to switch to high 106resolution modes. 107.It Dv VESA_DEBUG=N 108Set the VESA support debug level to 109.Fa N . 110The default value is zero, which suppresses all debugging output. 111.El 112.Pp 113The following options will remove some features from the 114.Nm 115driver and save kernel memory. 116.Bl -tag -width MOUSE 117.It Dv VGA_NO_FONT_LOADING 118The 119.Nm 120driver can load software font to EGA and VGA cards. 121This option removes this feature. 122Note that if you use this option and 123still wish to use the mouse on the console then you must also use the 124.Dv SC_ALT_MOUSE_IMAGE 125option. 126See 127.Xr syscons 4 . 128.It Dv VGA_NO_MODE_CHANGE 129This option prevents the driver from changing video modes. 130.El 131.\".Sh FILES 132.Sh EXAMPLES 133Your kernel configuration should normally have: 134.Pp 135.Dl "device vga" 136.Pp 137And you need the following line in 138.Pa /boot/device.hints . 139.Pp 140.Dl hint.vga.0.at="isa" 141.Pp 142The following lines should be included in the kernel configuration file 143in order to enable the VESA BIOS Extension support. 144.Pp 145.Dl "options VESA" 146.Dl "device vga" 147.Pp 148If you do not want VESA support included in the kernel, but 149want to use occasionally, do not add the 150.Dv VESA 151option. 152And load the 153.Nm vesa 154module as desired: 155.Pp 156.Dl kldload vesa 157.Pp 158.\".Sh DIAGNOSTICS 159.\".Sh CAVEATS 160.\".Sh BUGS 161.Sh SEE ALSO 162.Xr vgl 3 , 163.Xr syscons 4 , 164.Xr config 8 , 165.Xr kldload 8 , 166.Xr kldunload 8 167.Sh STANDARDS 168.Rs 169.%T "VESA BIOS Extension (VBE)" 170.%A Video Electronics Standards Association 171.Re 172.Sh HISTORY 173The 174.Nm 175driver first appeared in 176.Fx 3.1 . 177.Sh AUTHORS 178.An -nosplit 179The 180.Nm 181driver was written by 182.An S\(/oren Schmidt Aq sos@FreeBSD.org 183and 184.An Kazutaka Yokota Aq yokota@FreeBSD.org . 185This manual page was written by 186.An Kazutaka Yokota . 187