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 vga0 at isa? port ? conflicts" 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 keyword 55.Dv conflicts 56is required, as the video card may use I/O ports in the same range 57as other drivers. 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.Pq see 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 vga0 at isa? port ? conflicts" 134.Pp 135The following lines should be included in the kernel configuration file 136in order to enable the VESA BIOS Extension support. 137.Pp 138.Dl "options VESA" 139.Dl "device vga0 at isa? port ? conflicts" 140.Pp 141If you do not want VESA support included in the kernel, but 142want to use occasionally, do not add the 143.Dv VESA 144option. And load the 145.Nm vesa 146module as desired: 147.Pp 148.Dl kldload vesa 149.Pp 150.\".Sh DIAGNOSTICS 151.\".Sh CAVEATS 152.\".Sh BUGS 153.Sh SEE ALSO 154.Xr vgl 3 , 155.Xr syscons 4 , 156.Xr config 8 , 157.Xr kldload 8 , 158.Xr kldunload 8 159.Sh STANDARDS 160.Rs 161.%T "VESA BIOS Extension (VBE)" 162.%A Video Electronics Standards Association 163.Re 164.Sh HISTORY 165The 166.Nm 167driver first appeared in 168.Fx 3.1 . 169.Sh AUTHORS 170.An -nosplit 171The 172.Nm 173driver was written by 174.An S\(/oren Schmidt Aq sos@FreeBSD.org 175and 176.An Kazutaka Yokota Aq yokota@FreeBSD.org . 177This manual page was written by 178.An Kazutaka Yokota . 179