3 .\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
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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 driver supports the standard video cards: MDA, CGA, EGA and VGA.
58 In addition, the driver can utilize the VESA BIOS extension,
59 if the video card has one.
60 VESA support can either be statically included in the kernel or
61 available as a separate module.
63 In order to statically link the support to the kernel, define the
65 option (see below) and the
67 option in the kernel configuration file.
71 module can be loaded to the kernel, without static VESA support, by
75 option is required in the kernel configuration file in this case too.
76 .Sh DRIVER CONFIGURATION
77 .Ss Kernel Configuration Options
78 The following kernel configuration options control the
81 They may be set in the kernel configuration file
84 The following options are to provide compatibility with certain VGA
87 .It Em VGA_ALT_SEQACCESS
88 You may want to try this option if the mouse pointer is not drawn correctly
89 or font does not seem to be loaded properly on the VGA card.
90 However, it may cause flicker on some systems.
91 .It Em VGA_SLOW_IOACCESS
92 Older VGA cards may require this option for proper operation.
93 It makes the driver perform byte-wide I/O to VGA registers and
97 The following options add optional features to the driver.
100 Add VESA BIOS support to the driver.
101 If the VGA card has the VESA BIOS extension 1.2 or later,
102 this option will utilize the VESA BIOS service to switch to high
104 This option requires the
108 Set the VESA support debug level to N.
109 The default value is zero (all debugging output is suppressed).
112 The following options will remove some features from the
114 driver and save kernel memory.
115 .Bl -tag -width MOUSE
116 .It Em VGA_NO_FONT_LOADING
119 driver can load software font to EGA and VGA cards.
120 This option removes this feature.
121 .It Em VGA_NO_MODE_CHANGE
122 This option disallows the driver to change video modes.
126 Your kernel configuration should normally have:
128 .Dl "device vga0 at isa? port ? conflicts"
130 The following lines should be included in the kernel configuration file
131 in order to enable the VESA BIOS Extension support.
133 .Dl "options" \&"VM86\&"
134 .Dl "options" \&"VESA\&"
135 .Dl "device vga0 at isa? port ? conflicts"
137 If you do not want the VESA support always included in the kernel, but
138 want to use occasionally, add the following lines to the kernel configuration
141 .Dl "options" \&"VM86\&"
142 .Dl "device vga0 at isa? port ? conflicts"
146 module, when desired, as follows.
158 .%T "VESA BIOS Extension (VBE)"
159 .%A Video Electronics Standards Association
164 driver first appeared in
169 driver was written by
170 .An Søren Schmidt Aq sos@FreeBSD.org
172 .An Kazutaka Yokota Aq yokota@FreeBSD.org .
173 This manual page was written by
174 .An Kazutaka Yokota .