drivers/video/console/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # Video configuration
   4 #
   5
   6 menu "Console display driver support"
   7
   8 config 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
  25 config 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
  40 config 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
  50 config 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
  71 config 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
  86 config 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
  94 config DUMMY_CONSOLE
  95         bool
  96         depends on VGA_CONSOLE!=y || SGI_NEWPORT_CONSOLE!=y
  97         default y
  98
  99 config DUMMY_CONSOLE_COLUMNS
 100         int "Initial number of console screen columns"
 101         depends on DUMMY_CONSOLE && !ARM
 102         default 160 if PARISC
 103         default 80
 104         help
 105           On PA-RISC, the default value is 160, which should fit a 1280x1024
 106           monitor.
 107           Select 80 if you use a 640x480 resolution by default.
 108
 109 config DUMMY_CONSOLE_ROWS
 110         int "Initial number of console screen rows"
 111         depends on DUMMY_CONSOLE && !ARM
 112         default 64 if PARISC
 113         default 25
 114         help
 115           On PA-RISC, the default value is 64, which should fit a 1280x1024
 116           monitor.
 117           Select 25 if you use a 640x480 resolution by default.
 118
 119 config FRAMEBUFFER_CONSOLE
 120         bool "Framebuffer Console support"
 121         depends on FB && !UML
 122         select VT_HW_CONSOLE_BINDING
 123         select CRC32
 124         select FONT_SUPPORT
 125         help
 126           Low-level framebuffer-based console driver.
 127
 128 config FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
 129        bool "Map the console to the primary display device"
 130        depends on FRAMEBUFFER_CONSOLE
 131        default n
 132        ---help---
 133          If this option is selected, the framebuffer console will
 134          automatically select the primary display device (if the architecture
 135          supports this feature).  Otherwise, the framebuffer console will
 136          always select the first framebuffer driver that is loaded. The latter
 137          is the default behavior.
 138
 139          You can always override the automatic selection of the primary device
 140          by using the fbcon=map: boot option.
 141
 142          If unsure, select n.
 143
 144 config FRAMEBUFFER_CONSOLE_ROTATION
 145        bool "Framebuffer Console Rotation"
 146        depends on FRAMEBUFFER_CONSOLE
 147        help
 148          Enable display rotation for the framebuffer console.  This is done
 149          in software and may be significantly slower than a normally oriented
 150          display.  Note that the rotation is done at the console level only
 151          such that other users of the framebuffer will remain normally
 152          oriented.
 153
 154 config FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
 155         bool "Framebuffer Console Deferred Takeover"
 156         depends on FB=y && FRAMEBUFFER_CONSOLE && DUMMY_CONSOLE
 157         help
 158           If enabled this defers the framebuffer console taking over the
 159           console from the dummy console until the first text is displayed on
 160           the console. This is useful in combination with the "quiet" kernel
 161           commandline option to keep the framebuffer contents initially put up
 162           by the firmware in place, rather then replacing the contents with a
 163           black screen as soon as fbcon loads.
 164
 165 config STI_CONSOLE
 166         bool "STI text console"
 167         depends on PARISC && HAS_IOMEM
 168         select FONT_SUPPORT
 169         default y
 170         help
 171           The STI console is the builtin display/keyboard on HP-PARISC
 172           machines.  Say Y here to build support for it into your kernel.
 173           The alternative is to use your primary serial port as a console.
 174
 175 endmenu
 176