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