3 .\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
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32 .Nd generic video card interface
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"
44 .Pa /boot/device.hints :
45 .Cd hint.vga.0.at="isa"
49 driver is a generic video card driver which provides access to
51 This driver is required for the console driver
53 The console driver will call the
55 driver to manipulate video hardware (changing video modes, loading font, etc).
59 driver supports the standard video cards: MDA, CGA, EGA and VGA.
61 addition, the driver can utilize VESA BIOS extensions if the video card
63 VESA support can either be statically included in the kernel
64 or can be loaded as a separate module.
66 In order to statically link the VESA support to the kernel, the
68 option (see below) must be defined in the kernel configuration file.
72 module can be dynamically loaded into the kernel using
74 .Sh DRIVER CONFIGURATION
75 .Ss Kernel Configuration Options
76 The following kernel configuration options
79 can be used to control the
82 These options provide compatibility with certain VGA cards.
84 .It Dv VGA_ALT_SEQACCESS
85 You may want to try this option if the mouse pointer is not drawn correctly
86 or the font does not seem to be loaded properly on the VGA card.
87 However, it may cause flicker on some systems.
88 .It Dv VGA_SLOW_IOACCESS
89 Older VGA cards may require this option for proper operation.
90 It makes the driver perform byte-wide I/O to VGA registers and
93 This option enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60.
94 These modes are not always supported by the video card and the display.
95 It is highly likely that LCD display cannot work with these modes.
98 The following options add optional features to the driver.
101 Add VESA BIOS support to the driver.
102 If the VGA card has the VESA BIOS extension 1.2 or later,
103 this option will utilize the VESA BIOS service to switch to high
106 Set the VESA support debug level to
108 The default value is zero, which suppresses all debugging output.
111 The following options will remove some features from the
113 driver and save kernel memory.
114 .Bl -tag -width MOUSE
115 .It Dv VGA_NO_FONT_LOADING
118 driver can load software font to EGA and VGA cards.
119 This option removes this feature.
120 Note that if you use this option and
121 still wish to use the mouse on the console then you must also use the
122 .Dv SC_ALT_MOUSE_IMAGE
126 .It Dv VGA_NO_MODE_CHANGE
127 This option prevents the driver from changing video modes.
131 Your kernel configuration should normally have:
135 And you need the following line in
136 .Pa /boot/device.hints .
138 .Dl hint.vga.0.at="isa"
140 The following lines should be included in the kernel configuration file
141 in order to enable the VESA BIOS Extension support.
146 If you do not want VESA support included in the kernel, but
147 want to use occasionally, do not add the
166 .%T "VESA BIOS Extension (VBE)"
167 .%A Video Electronics Standards Association
172 driver first appeared in
178 driver was written by
179 .An S\(/oren Schmidt Aq Mt sos@FreeBSD.org
181 .An Kazutaka Yokota Aq Mt yokota@FreeBSD.org .
182 This manual page was written by
183 .An Kazutaka Yokota .