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.Dd June 30, 1999 28.Dt VGA 4 29.Os 30.Sh NAME 31.Nm vga 32.Nd generic video card interface 33.Sh SYNOPSIS 34.Cd "options VESA" 35.Cd "options VESA_DEBUG=N" 36.Cd "options VGA_ALT_SEQACCESS" 37.Cd "options VGA_NO_FONT_LOADING" 38.Cd "options VGA_NO_MODE_CHANGE" 39.Cd "options VGA_SLOW_IOACCESS" 40.Cd "options VGA_WIDTH90" 41.Cd "device vga" 42.Pp 43In 44.Pa /boot/device.hints : 45.Cd hint.vga.0.at="isa" 46.Sh DESCRIPTION 47The 48.Nm 49driver is a generic video card driver which provides access to 50video cards. 51This driver is required for the console driver 52.Xr syscons 4 . 53The console driver will call the 54.Nm 55driver to manipulate video hardware (changing video modes, loading font, etc). 56.Pp 57The 58.Nm 59driver supports the standard video cards: MDA, CGA, EGA and VGA. 60In 61addition, the driver can utilize VESA BIOS extensions if the video card 62supports them. 63VESA support can either be statically included in the kernel 64or can be loaded as a separate module. 65.Pp 66In order to statically link the VESA support to the kernel, the 67.Dv VESA 68option (see below) must be defined in the kernel configuration file. 69.Pp 70The 71.Nm vesa 72module can be dynamically loaded into the kernel using 73.Xr kldload 8 . 74.Sh DRIVER CONFIGURATION 75.Ss Kernel Configuration Options 76The following kernel configuration options 77(see 78.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 Dv 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 Dv 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 Dv 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 Dv 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 Dv 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 Dv VGA_NO_FONT_LOADING 116The 117.Nm 118driver can load software font to EGA and VGA cards. 119This option removes this feature. 120Note that if you use this option and 121still wish to use the mouse on the console then you must also use the 122.Dv SC_ALT_MOUSE_IMAGE 123option. 124See 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. 150And load the 151.Nm vesa 152module as desired: 153.Pp 154.Dl kldload vesa 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 Mt sos@FreeBSD.org 180and 181.An Kazutaka Yokota Aq Mt yokota@FreeBSD.org . 182This manual page was written by 183.An Kazutaka Yokota . 184