3 .\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
4 .\" All rights reserved.
6 .\" Redistribution and use in source and binary forms, with or without
7 .\" modification, are permitted provided that the following conditions
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.
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16 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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27 .\" $Id: vga.4,v 1.1 1999/02/07 05:40:14 yokota Exp $
35 generic video card interface
37 .Cd "options" \&"VESA\&"
38 .Cd "options" \&"VESA_DEBUG=N\&"
39 .Cd "options" \&"VGA_ALT_SEQACCESS\&"
40 .Cd "options" \&"VGA_NO_FONT_LOADING\&"
41 .Cd "options" \&"VGA_NO_MODE_CHANGE\&"
42 .Cd "options" \&"VGA_SLOW_IOACCESS\&"
43 .Cd "options" \&"VM86\&"
44 .Cd "device vga0 at isa? port ? conflicts"
48 driver is a generic video card driver which provides access to
49 video cards. This driver is required for the console driver
51 The console driver will call the
53 driver to manipulate video hardware (changing video modes, loading font, etc).
57 is required, as the video card may use I/O ports in the same range
62 driver supports the standard video cards: MDA, CGA, EGA and VGA. In
63 addition, the driver can utilize VESA BIOS extensions if the video card
64 supports them. VESA support can either be statically included in the kernel
65 or can be loaded as a separate module.
67 In order to statically link the support to the kernel, the
69 option (see below) and the
71 option must be defined in the kernel configuration file.
75 module can be dynamically loaded into the kernel using
79 option to be defined in the kernel configuration file.
80 .Sh DRIVER CONFIGURATION
81 .Ss Kernel Configuration Options
82 The following kernel configuration options
84 can be used to control the
87 These options provide compatibility with certain VGA cards.
89 .It Em VGA_ALT_SEQACCESS
90 You may want to try this option if the mouse pointer is not drawn correctly
91 or the font does not seem to be loaded properly on the VGA card.
92 However, it may cause flicker on some systems.
93 .It Em VGA_SLOW_IOACCESS
94 Older VGA cards may require this option for proper operation.
95 It makes the driver perform byte-wide I/O to VGA registers and
99 The following options add optional features to the driver.
100 .Bl -tag -width MOUSE
102 Add VESA BIOS support to the driver.
103 If the VGA card has the VESA BIOS extension 1.2 or later,
104 this option will utilize the VESA BIOS service to switch to high
106 This option requires the
110 Set the VESA support debug level to
112 The default value is zero, which suppresses all debugging output.
115 The following options will remove some features from the
117 driver and save kernel memory.
118 .Bl -tag -width MOUSE
119 .It Em VGA_NO_FONT_LOADING
122 driver can load software font to EGA and VGA cards.
123 This option removes this feature.
124 .It Em VGA_NO_MODE_CHANGE
125 This option prevents the driver from changing video modes.
129 Your kernel configuration should normally have:
131 .Dl "device vga0 at isa? port ? conflicts"
133 The following lines should be included in the kernel configuration file
134 in order to enable the VESA BIOS Extension support.
136 .Dl "options" \&"VM86\&"
137 .Dl "options" \&"VESA\&"
138 .Dl "device vga0 at isa? port ? conflicts"
140 If you do not want VESA support included in the kernel, but
141 want to use occasionally, add the following lines to the kernel configuration
144 .Dl "options" \&"VM86\&"
145 .Dl "device vga0 at isa? port ? conflicts"
163 .%T "VESA BIOS Extension (VBE)"
164 .%A Video Electronics Standards Association
169 driver first appeared in
174 driver was written by
175 .An Søren Schmidt Aq sos@FreeBSD.org
177 .An Kazutaka Yokota Aq yokota@FreeBSD.org .
178 This manual page was written by
179 .An Kazutaka Yokota .