xref: /openbmc/linux/drivers/video/console/Kconfig (revision 82df5b73) 
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Video configuration
4#
5
6menu "Console display driver support"
7
8config VGA_CONSOLE
9	bool "VGA text console" if EXPERT || !X86
10	depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC &&  !SUPERH && \
11		(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
12		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !NDS32 && !S390
13	default y
14	help
15	  Saying Y here will allow you to use Linux in text mode through a
16	  display that complies with the generic VGA standard. Virtually
17	  everyone wants that.
18
19	  The program SVGATextMode can be used to utilize SVGA video cards to
20	  their full potential in text mode. Download it from
21	  <ftp://ibiblio.org/pub/Linux/utils/console/>.
22
23	  Say Y.
24
25config VGACON_SOFT_SCROLLBACK
26       bool "Enable Scrollback Buffer in System RAM"
27       depends on VGA_CONSOLE
28       default n
29       help
30	 The scrollback buffer of the standard VGA console is located in
31	 the VGA RAM.  The size of this RAM is fixed and is quite small.
32	 If you require a larger scrollback buffer, this can be placed in
33	 System RAM which is dynamically allocated during initialization.
34	 Placing the scrollback buffer in System RAM will slightly slow
35	 down the console.
36
37	 If you want this feature, say 'Y' here and enter the amount of
38	 RAM to allocate for this buffer.  If unsure, say 'N'.
39
40config VGACON_SOFT_SCROLLBACK_SIZE
41       int "Scrollback Buffer Size (in KB)"
42       depends on VGACON_SOFT_SCROLLBACK
43       range 1 1024
44       default "64"
45       help
46	  Enter the amount of System RAM to allocate for scrollback
47	  buffers of VGA consoles. Each 64KB will give you approximately
48	  16 80x25 screenfuls of scrollback buffer.
49
50config VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT
51	bool "Persistent Scrollback History for each console by default"
52	depends on VGACON_SOFT_SCROLLBACK
53	default n
54	help
55	  Say Y here if the scrollback history should persist by default when
56	  switching between consoles. Otherwise, the scrollback history will be
57	  flushed each time the console is switched. This feature can also be
58	  enabled using the boot command line parameter
59	  'vgacon.scrollback_persistent=1'.
60
61	  This feature might break your tool of choice to flush the scrollback
62	  buffer, e.g. clear(1) will work fine but Debian's clear_console(1)
63	  will be broken, which might cause security issues.
64	  You can use the escape sequence \e[3J instead if this feature is
65	  activated.
66
67	  Note that a buffer of VGACON_SOFT_SCROLLBACK_SIZE is taken for each
68	  created tty device.
69	  So if you use a RAM-constrained system, say N here.
70
71config MDA_CONSOLE
72	depends on !M68K && !PARISC && ISA
73	tristate "MDA text console (dual-headed)"
74	help
75	  Say Y here if you have an old MDA or monochrome Hercules graphics
76	  adapter in your system acting as a second head ( = video card). You
77	  will then be able to use two monitors with your Linux system. Do not
78	  say Y here if your MDA card is the primary card in your system; the
79	  normal VGA driver will handle it.
80
81	  To compile this driver as a module, choose M here: the
82	  module will be called mdacon.
83
84	  If unsure, say N.
85
86config SGI_NEWPORT_CONSOLE
87	tristate "SGI Newport Console support"
88	depends on SGI_IP22 && HAS_IOMEM
89	select FONT_SUPPORT
90	help
91	  Say Y here if you want the console on the Newport aka XL graphics
92	  card of your Indy.  Most people say Y here.
93
94config DUMMY_CONSOLE
95	bool
96	default y
97
98config DUMMY_CONSOLE_COLUMNS
99	int "Initial number of console screen columns"
100	depends on DUMMY_CONSOLE && !ARM
101	default 160 if PARISC
102	default 80
103	help
104	  On PA-RISC, the default value is 160, which should fit a 1280x1024
105	  monitor.
106	  Select 80 if you use a 640x480 resolution by default.
107
108config DUMMY_CONSOLE_ROWS
109	int "Initial number of console screen rows"
110	depends on DUMMY_CONSOLE && !ARM
111	default 64 if PARISC
112	default 25
113	help
114	  On PA-RISC, the default value is 64, which should fit a 1280x1024
115	  monitor.
116	  Select 25 if you use a 640x480 resolution by default.
117
118config FRAMEBUFFER_CONSOLE
119	bool "Framebuffer Console support"
120	depends on FB && !UML
121	select VT_HW_CONSOLE_BINDING
122	select CRC32
123	select FONT_SUPPORT
124	help
125	  Low-level framebuffer-based console driver.
126
127config FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
128       bool "Map the console to the primary display device"
129       depends on FRAMEBUFFER_CONSOLE
130       default n
131	help
132	 If this option is selected, the framebuffer console will
133	 automatically select the primary display device (if the architecture
134	 supports this feature).  Otherwise, the framebuffer console will
135	 always select the first framebuffer driver that is loaded. The latter
136	 is the default behavior.
137
138	 You can always override the automatic selection of the primary device
139	 by using the fbcon=map: boot option.
140
141	 If unsure, select n.
142
143config FRAMEBUFFER_CONSOLE_ROTATION
144       bool "Framebuffer Console Rotation"
145       depends on FRAMEBUFFER_CONSOLE
146       help
147	 Enable display rotation for the framebuffer console.  This is done
148	 in software and may be significantly slower than a normally oriented
149	 display.  Note that the rotation is done at the console level only
150	 such that other users of the framebuffer will remain normally
151	 oriented.
152
153config FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
154	bool "Framebuffer Console Deferred Takeover"
155	depends on FB=y && FRAMEBUFFER_CONSOLE && DUMMY_CONSOLE
156	help
157	  If enabled this defers the framebuffer console taking over the
158	  console from the dummy console until the first text is displayed on
159	  the console. This is useful in combination with the "quiet" kernel
160	  commandline option to keep the framebuffer contents initially put up
161	  by the firmware in place, rather then replacing the contents with a
162	  black screen as soon as fbcon loads.
163
164config STI_CONSOLE
165	bool "STI text console"
166	depends on PARISC && HAS_IOMEM
167	select FONT_SUPPORT
168	default y
169	help
170	  The STI console is the builtin display/keyboard on HP-PARISC
171	  machines.  Say Y here to build support for it into your kernel.
172	  The alternative is to use your primary serial port as a console.
173
174endmenu
175
176