drivers/video/console/Kconfig - linux - Git at Google

 # SPDX-License-Identifier: GPL-2.0-only
 #
 # Video configuration
 #

 menu "Console display driver support"

 config VGA_CONSOLE
 	bool "VGA text console" if EXPERT || !X86
 	depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC &&  !SUPERH && \
 		(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
 		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !NDS32 && !S390
 	default y
 	help
 	  Saying Y here will allow you to use Linux in text mode through a
 	  display that complies with the generic VGA standard. Virtually
 	  everyone wants that.

 	  The program SVGATextMode can be used to utilize SVGA video cards to
 	  their full potential in text mode. Download it from
 	  <ftp://ibiblio.org/pub/Linux/utils/console/>.

 	  Say Y.

 config VGACON_SOFT_SCROLLBACK
        bool "Enable Scrollback Buffer in System RAM"
        depends on VGA_CONSOLE
        default n
        help
          The scrollback buffer of the standard VGA console is located in
 	 the VGA RAM.  The size of this RAM is fixed and is quite small.
 	 If you require a larger scrollback buffer, this can be placed in
 	 System RAM which is dynamically allocated during initialization.
 	 Placing the scrollback buffer in System RAM will slightly slow
 	 down the console.

 	 If you want this feature, say 'Y' here and enter the amount of
 	 RAM to allocate for this buffer.  If unsure, say 'N'.

 config VGACON_SOFT_SCROLLBACK_SIZE
        int "Scrollback Buffer Size (in KB)"
        depends on VGACON_SOFT_SCROLLBACK
        range 1 1024
        default "64"
        help
 	  Enter the amount of System RAM to allocate for scrollback
 	  buffers of VGA consoles. Each 64KB will give you approximately
 	  16 80x25 screenfuls of scrollback buffer.

 config VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT
 	bool "Persistent Scrollback History for each console by default"
 	depends on VGACON_SOFT_SCROLLBACK
 	default n
 	help
 	  Say Y here if the scrollback history should persist by default when
 	  switching between consoles. Otherwise, the scrollback history will be
 	  flushed each time the console is switched. This feature can also be
 	  enabled using the boot command line parameter
 	  'vgacon.scrollback_persistent=1'.

 	  This feature might break your tool of choice to flush the scrollback
 	  buffer, e.g. clear(1) will work fine but Debian's clear_console(1)
 	  will be broken, which might cause security issues.
 	  You can use the escape sequence \e[3J instead if this feature is
 	  activated.

 	  Note that a buffer of VGACON_SOFT_SCROLLBACK_SIZE is taken for each
 	  created tty device.
 	  So if you use a RAM-constrained system, say N here.

 config MDA_CONSOLE
 	depends on !M68K && !PARISC && ISA
 	tristate "MDA text console (dual-headed)"
 	---help---
 	  Say Y here if you have an old MDA or monochrome Hercules graphics
 	  adapter in your system acting as a second head ( = video card). You
 	  will then be able to use two monitors with your Linux system. Do not
 	  say Y here if your MDA card is the primary card in your system; the
 	  normal VGA driver will handle it.

 	  To compile this driver as a module, choose M here: the
 	  module will be called mdacon.

 	  If unsure, say N.

 config SGI_NEWPORT_CONSOLE
         tristate "SGI Newport Console support"
 	depends on SGI_IP22 && HAS_IOMEM
         select FONT_SUPPORT
         help
           Say Y here if you want the console on the Newport aka XL graphics
           card of your Indy.  Most people say Y here.

 config DUMMY_CONSOLE
 	bool
 	depends on VGA_CONSOLE!=y || SGI_NEWPORT_CONSOLE!=y
 	default y

 config DUMMY_CONSOLE_COLUMNS
         int "Initial number of console screen columns"
         depends on DUMMY_CONSOLE && !ARM
         default 160 if PARISC
         default 80
         help
           On PA-RISC, the default value is 160, which should fit a 1280x1024
           monitor.
           Select 80 if you use a 640x480 resolution by default.

 config DUMMY_CONSOLE_ROWS
         int "Initial number of console screen rows"
         depends on DUMMY_CONSOLE && !ARM
         default 64 if PARISC
         default 25
         help
           On PA-RISC, the default value is 64, which should fit a 1280x1024
           monitor.
           Select 25 if you use a 640x480 resolution by default.

 config FRAMEBUFFER_CONSOLE
 	bool "Framebuffer Console support"
 	depends on FB && !UML
 	select VT_HW_CONSOLE_BINDING
 	select CRC32
 	select FONT_SUPPORT
 	help
 	  Low-level framebuffer-based console driver.

 config FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
        bool "Map the console to the primary display device"
        depends on FRAMEBUFFER_CONSOLE
        default n
        ---help---
          If this option is selected, the framebuffer console will
          automatically select the primary display device (if the architecture
 	 supports this feature).  Otherwise, the framebuffer console will
          always select the first framebuffer driver that is loaded. The latter
          is the default behavior.

 	 You can always override the automatic selection of the primary device
 	 by using the fbcon=map: boot option.

 	 If unsure, select n.

 config FRAMEBUFFER_CONSOLE_ROTATION
        bool "Framebuffer Console Rotation"
        depends on FRAMEBUFFER_CONSOLE
        help
          Enable display rotation for the framebuffer console.  This is done
          in software and may be significantly slower than a normally oriented
          display.  Note that the rotation is done at the console level only
          such that other users of the framebuffer will remain normally
          oriented.

 config FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
 	bool "Framebuffer Console Deferred Takeover"
 	depends on FB=y && FRAMEBUFFER_CONSOLE && DUMMY_CONSOLE
 	help
 	  If enabled this defers the framebuffer console taking over the
 	  console from the dummy console until the first text is displayed on
 	  the console. This is useful in combination with the "quiet" kernel
 	  commandline option to keep the framebuffer contents initially put up
 	  by the firmware in place, rather then replacing the contents with a
 	  black screen as soon as fbcon loads.

 config STI_CONSOLE
         bool "STI text console"
 	depends on PARISC && HAS_IOMEM
         select FONT_SUPPORT
         default y
         help
           The STI console is the builtin display/keyboard on HP-PARISC
           machines.  Say Y here to build support for it into your kernel.
           The alternative is to use your primary serial port as a console.

 endmenu
	# SPDX-License-Identifier: GPL-2.0-only
	#
	# Video configuration
	#

	menu "Console display driver support"

	config VGA_CONSOLE
	bool "VGA text console" if EXPERT \|\| !X86
	depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC && !SUPERH && \
	(!ARM \|\| ARCH_FOOTBRIDGE \|\| ARCH_INTEGRATOR \|\| ARCH_NETWINDER) && \
	!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !NDS32 && !S390
	default y
	help
	Saying Y here will allow you to use Linux in text mode through a
	display that complies with the generic VGA standard. Virtually
	everyone wants that.

	The program SVGATextMode can be used to utilize SVGA video cards to
	their full potential in text mode. Download it from
	<ftp://ibiblio.org/pub/Linux/utils/console/>.

	Say Y.

	config VGACON_SOFT_SCROLLBACK
	bool "Enable Scrollback Buffer in System RAM"
	depends on VGA_CONSOLE
	default n
	help
	The scrollback buffer of the standard VGA console is located in
	the VGA RAM. The size of this RAM is fixed and is quite small.
	If you require a larger scrollback buffer, this can be placed in
	System RAM which is dynamically allocated during initialization.
	Placing the scrollback buffer in System RAM will slightly slow
	down the console.

	If you want this feature, say 'Y' here and enter the amount of
	RAM to allocate for this buffer. If unsure, say 'N'.

	config VGACON_SOFT_SCROLLBACK_SIZE
	int "Scrollback Buffer Size (in KB)"
	depends on VGACON_SOFT_SCROLLBACK
	range 1 1024
	default "64"
	help
	Enter the amount of System RAM to allocate for scrollback
	buffers of VGA consoles. Each 64KB will give you approximately
	16 80x25 screenfuls of scrollback buffer.

	config VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT
	bool "Persistent Scrollback History for each console by default"
	depends on VGACON_SOFT_SCROLLBACK
	default n
	help
	Say Y here if the scrollback history should persist by default when
	switching between consoles. Otherwise, the scrollback history will be
	flushed each time the console is switched. This feature can also be
	enabled using the boot command line parameter
	'vgacon.scrollback_persistent=1'.

	This feature might break your tool of choice to flush the scrollback
	buffer, e.g. clear(1) will work fine but Debian's clear_console(1)
	will be broken, which might cause security issues.
	You can use the escape sequence \e[3J instead if this feature is
	activated.

	Note that a buffer of VGACON_SOFT_SCROLLBACK_SIZE is taken for each
	created tty device.
	So if you use a RAM-constrained system, say N here.

	config MDA_CONSOLE
	depends on !M68K && !PARISC && ISA
	tristate "MDA text console (dual-headed)"
	---help---
	Say Y here if you have an old MDA or monochrome Hercules graphics
	adapter in your system acting as a second head ( = video card). You
	will then be able to use two monitors with your Linux system. Do not
	say Y here if your MDA card is the primary card in your system; the
	normal VGA driver will handle it.

	To compile this driver as a module, choose M here: the
	module will be called mdacon.

	If unsure, say N.

	config SGI_NEWPORT_CONSOLE
	tristate "SGI Newport Console support"
	depends on SGI_IP22 && HAS_IOMEM
	select FONT_SUPPORT
	help
	Say Y here if you want the console on the Newport aka XL graphics
	card of your Indy. Most people say Y here.

	config DUMMY_CONSOLE
	bool
	depends on VGA_CONSOLE!=y \|\| SGI_NEWPORT_CONSOLE!=y
	default y

	config DUMMY_CONSOLE_COLUMNS
	int "Initial number of console screen columns"
	depends on DUMMY_CONSOLE && !ARM
	default 160 if PARISC
	default 80
	help
	On PA-RISC, the default value is 160, which should fit a 1280x1024
	monitor.
	Select 80 if you use a 640x480 resolution by default.

	config DUMMY_CONSOLE_ROWS
	int "Initial number of console screen rows"
	depends on DUMMY_CONSOLE && !ARM
	default 64 if PARISC
	default 25
	help
	On PA-RISC, the default value is 64, which should fit a 1280x1024
	monitor.
	Select 25 if you use a 640x480 resolution by default.

	config FRAMEBUFFER_CONSOLE
	bool "Framebuffer Console support"
	depends on FB && !UML
	select VT_HW_CONSOLE_BINDING
	select CRC32
	select FONT_SUPPORT
	help
	Low-level framebuffer-based console driver.

	config FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
	bool "Map the console to the primary display device"
	depends on FRAMEBUFFER_CONSOLE
	default n
	---help---
	If this option is selected, the framebuffer console will
	automatically select the primary display device (if the architecture
	supports this feature). Otherwise, the framebuffer console will
	always select the first framebuffer driver that is loaded. The latter
	is the default behavior.

	You can always override the automatic selection of the primary device
	by using the fbcon=map: boot option.

	If unsure, select n.

	config FRAMEBUFFER_CONSOLE_ROTATION
	bool "Framebuffer Console Rotation"
	depends on FRAMEBUFFER_CONSOLE
	help
	Enable display rotation for the framebuffer console. This is done
	in software and may be significantly slower than a normally oriented
	display. Note that the rotation is done at the console level only
	such that other users of the framebuffer will remain normally
	oriented.

	config FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
	bool "Framebuffer Console Deferred Takeover"
	depends on FB=y && FRAMEBUFFER_CONSOLE && DUMMY_CONSOLE
	help
	If enabled this defers the framebuffer console taking over the
	console from the dummy console until the first text is displayed on
	the console. This is useful in combination with the "quiet" kernel
	commandline option to keep the framebuffer contents initially put up
	by the firmware in place, rather then replacing the contents with a
	black screen as soon as fbcon loads.

	config STI_CONSOLE
	bool "STI text console"
	depends on PARISC && HAS_IOMEM
	select FONT_SUPPORT
	default y
	help
	The STI console is the builtin display/keyboard on HP-PARISC
	machines. Say Y here to build support for it into your kernel.
	The alternative is to use your primary serial port as a console.

	endmenu