config TTY	bool "Enable TTY" if EXPERT	default y	---help---	  Allows you to remove TTY support which can save space, and	  blocks features that require TTY from inclusion in the kernel.	  TTY is required for any text terminals or serial port	  communication. Most users should leave this enabled. if TTY config VT	bool "Virtual terminal" if EXPERT	depends on !S390 && !UML	select INPUT	default y	---help---	  If you say Y here, you will get support for terminal devices with	  display and keyboard devices. These are called "virtual" because you	  can run several virtual terminals (also called virtual consoles) on	  one physical terminal. This is rather useful, for example one	  virtual terminal can collect system messages and warnings, another	  one can be used for a text-mode user session, and a third could run	  an X session, all in parallel. Switching between virtual terminals	  is done with certain key combinations, usually Alt-<function key>. 	  The setterm command ("man setterm") can be used to change the	  properties (such as colors or beeping) of a virtual terminal. The	  man page console_codes(4) ("man console_codes") contains the special	  character sequences that can be used to change those properties	  directly. The fonts used on virtual terminals can be changed with	  the setfont ("man setfont") command and the key bindings are defined	  with the loadkeys ("man loadkeys") command. 	  You need at least one virtual terminal device in order to make use	  of your keyboard and monitor. Therefore, only people configuring an	  embedded system would want to say N here in order to save some	  memory; the only way to log into such a system is then via a serial	  or network connection. 	  If unsure, say Y, or else you won't be able to do much with your new	  shiny Linux system :-) config CONSOLE_TRANSLATIONS	depends on VT	default y	bool "Enable character translations in console" if EXPERT	---help---	  This enables support for font mapping and Unicode translation	  on virtual consoles. config VT_CONSOLE	bool "Support for console on virtual terminal" if EXPERT	depends on VT	default y	---help---	  The system console is the device which receives all kernel messages	  and warnings and which allows logins in single user mode. If you	  answer Y here, a virtual terminal (the device used to interact with	  a physical terminal) can be used as system console. This is the most	  common mode of operations, so you should say Y here unless you want	  the kernel messages be output only to a serial port (in which case	  you should say Y to "Console on serial port", below). 	  If you do say Y here, by default the currently visible virtual	  terminal (/dev/tty0) will be used as system console. You can change	  that with a kernel command line option such as "console=tty3" which	  would use the third virtual terminal as system console. (Try "man	  bootparam" or see the documentation of your boot loader (lilo or	  loadlin) about how to pass options to the kernel at boot time.) 	  If unsure, say Y. config VT_CONSOLE_SLEEP	def_bool y	depends on VT_CONSOLE && PM_SLEEP config HW_CONSOLE	bool	depends on VT && !UML	default y config VT_HW_CONSOLE_BINDING       bool "Support for binding and unbinding console drivers"       depends on HW_CONSOLE       default n       ---help---         The virtual terminal is the device that interacts with the physical         terminal through console drivers. On these systems, at least one         console driver is loaded. In other configurations, additional console         drivers may be enabled, such as the framebuffer console. If more than         1 console driver is enabled, setting this to 'y' will allow you to         select the console driver that will serve as the backend for the         virtual terminals. 	 See <file:Documentation/console/console.txt> for more	 information. For framebuffer console users, please refer to	 <file:Documentation/fb/fbcon.txt>. config UNIX98_PTYS	bool "Unix98 PTY support" if EXPERT	default y	---help---	  A pseudo terminal (PTY) is a software device consisting of two	  halves: a master and a slave. The slave device behaves identical to	  a physical terminal; the master device is used by a process to	  read data from and write data to the slave, thereby emulating a	  terminal. Typical programs for the master side are telnet servers	  and xterms. 	  Linux has traditionally used the BSD-like names /dev/ptyxx for	  masters and /dev/ttyxx for slaves of pseudo terminals. This scheme	  has a number of problems. The GNU C library glibc 2.1 and later,	  however, supports the Unix98 naming standard: in order to acquire a	  pseudo terminal, a process opens /dev/ptmx; the number of the pseudo	  terminal is then made available to the process and the pseudo	  terminal slave can be accessed as /dev/pts/<number>. What was	  traditionally /dev/ttyp2 will then be /dev/pts/2, for example. 	  All modern Linux systems use the Unix98 ptys.  Say Y unless	  you're on an embedded system and want to conserve memory. config DEVPTS_MULTIPLE_INSTANCES	bool "Support multiple instances of devpts"	depends on UNIX98_PTYS	default n	---help---	  Enable support for multiple instances of devpts filesystem.	  If you want to have isolated PTY namespaces (eg: in containers),	  say Y here.  Otherwise, say N. If enabled, each mount of devpts	  filesystem with the '-o newinstance' option will create an	  independent PTY namespace. config LEGACY_PTYS	bool "Legacy (BSD) PTY support"	default y	---help---	  A pseudo terminal (PTY) is a software device consisting of two	  halves: a master and a slave. The slave device behaves identical to	  a physical terminal; the master device is used by a process to	  read data from and write data to the slave, thereby emulating a	  terminal. Typical programs for the master side are telnet servers	  and xterms. 	  Linux has traditionally used the BSD-like names /dev/ptyxx	  for masters and /dev/ttyxx for slaves of pseudo	  terminals. This scheme has a number of problems, including	  security.  This option enables these legacy devices; on most	  systems, it is safe to say N.  config LEGACY_PTY_COUNT	int "Maximum number of legacy PTY in use"	depends on LEGACY_PTYS	range 0 256	default "256"	---help---	  The maximum number of legacy PTYs that can be used at any one time.	  The default is 256, and should be more than enough.  Embedded	  systems may want to reduce this to save memory. 	  When not in use, each legacy PTY occupies 12 bytes on 32-bit	  architectures and 24 bytes on 64-bit architectures. config BFIN_JTAG_COMM	tristate "Blackfin JTAG Communication"	depends on BLACKFIN	help	  Add support for emulating a TTY device over the Blackfin JTAG. 	  To compile this driver as a module, choose M here: the	  module will be called bfin_jtag_comm. config BFIN_JTAG_COMM_CONSOLE	bool "Console on Blackfin JTAG"	depends on BFIN_JTAG_COMM=y config SERIAL_NONSTANDARD	bool "Non-standard serial port support"	depends on HAS_IOMEM	---help---	  Say Y here if you have any non-standard serial boards -- boards	  which aren't supported using the standard "dumb" serial driver.	  This includes intelligent serial boards such as Cyclades,	  Digiboards, etc. These are usually used for systems that need many	  serial ports because they serve many terminals or dial-in	  connections. 	  Note that the answer to this question won't directly affect the	  kernel: saying N will just cause the configurator to skip all	  the questions about non-standard serial boards. 	  Most people can say N here. config ROCKETPORT	tristate "Comtrol RocketPort support"	depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)	help	  This driver supports Comtrol RocketPort and RocketModem PCI boards.             These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or          modems.  For information about the RocketPort/RocketModem  boards          and this driver read <file:Documentation/serial/rocket.txt>. 	  To compile this driver as a module, choose M here: the	  module will be called rocket. 	  If you want to compile this driver into the kernel, say Y here.  If          you don't have a Comtrol RocketPort/RocketModem card installed, say N. config CYCLADES	tristate "Cyclades async mux support"	depends on SERIAL_NONSTANDARD && (PCI || ISA)	select FW_LOADER	---help---	  This driver supports Cyclades Z and Y multiserial boards.	  You would need something like this to connect more than two modems to	  your Linux box, for instance in order to become a dial-in server. 	  For information about the Cyclades-Z card, read	  <file:Documentation/serial/README.cycladesZ>. 	  To compile this driver as a module, choose M here: the	  module will be called cyclades. 	  If you haven't heard about it, it's safe to say N. config CYZ_INTR	bool "Cyclades-Z interrupt mode operation"	depends on CYCLADES	help	  The Cyclades-Z family of multiport cards allows 2 (two) driver op	  modes: polling and interrupt. In polling mode, the driver will check	  the status of the Cyclades-Z ports every certain amount of time	  (which is called polling cycle and is configurable). In interrupt	  mode, it will use an interrupt line (IRQ) in order to check the	  status of the Cyclades-Z ports. The default op mode is polling. If	  unsure, say N. config MOXA_INTELLIO	tristate "Moxa Intellio support"	depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)	select FW_LOADER	help	  Say Y here if you have a Moxa Intellio multiport serial card. 	  To compile this driver as a module, choose M here: the	  module will be called moxa. config MOXA_SMARTIO	tristate "Moxa SmartIO support v. 2.0"	depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)	help	  Say Y here if you have a Moxa SmartIO multiport serial card and/or	  want to help develop a new version of this driver. 	  This is upgraded (1.9.1) driver from original Moxa drivers with	  changes finally resulting in PCI probing. 	  This driver can also be built as a module. The module will be called	  mxser. If you want to do that, say M here. config SYNCLINK	tristate "Microgate SyncLink card support"	depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API	help	  Provides support for the SyncLink ISA and PCI multiprotocol serial	  adapters. These adapters support asynchronous and HDLC bit	  synchronous communication up to 10Mbps (PCI adapter). 	  This driver can only be built as a module ( = code which can be	  inserted in and removed from the running kernel whenever you want).	  The module will be called synclink.  If you want to do that, say M	  here. config SYNCLINKMP	tristate "SyncLink Multiport support"	depends on SERIAL_NONSTANDARD && PCI	help	  Enable support for the SyncLink Multiport (2 or 4 ports)	  serial adapter, running asynchronous and HDLC communications up	  to 2.048Mbps. Each ports is independently selectable for	  RS-232, V.35, RS-449, RS-530, and X.21 	  This driver may be built as a module ( = code which can be	  inserted in and removed from the running kernel whenever you want).	  The module will be called synclinkmp.  If you want to do that, say M	  here. config SYNCLINK_GT	tristate "SyncLink GT/AC support"	depends on SERIAL_NONSTANDARD && PCI	help	  Support for SyncLink GT and SyncLink AC families of	  synchronous and asynchronous serial adapters	  manufactured by Microgate Systems, Ltd. (www.microgate.com) config NOZOMI	tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"	depends on PCI	help	  If you have a HSDPA driver Broadband Wireless Data Card -	  Globe Trotter PCMCIA card, say Y here. 	  To compile this driver as a module, choose M here, the module	  will be called nozomi. config ISI	tristate "Multi-Tech multiport card support"	depends on SERIAL_NONSTANDARD && PCI	select FW_LOADER	help	  This is a driver for the Multi-Tech cards which provide several	  serial ports.  The driver is experimental and can currently only be	  built as a module. The module will be called isicom.	  If you want to do that, choose M here. config N_HDLC	tristate "HDLC line discipline support"	depends on SERIAL_NONSTANDARD	help	  Allows synchronous HDLC communications with tty device drivers that	  support synchronous HDLC such as the Microgate SyncLink adapter. 	  This driver can be built as a module ( = code which can be	  inserted in and removed from the running kernel whenever you want).	  The module will be called n_hdlc. If you want to do that, say M	  here. config N_GSM	tristate "GSM MUX line discipline support (EXPERIMENTAL)"	depends on NET	help	  This line discipline provides support for the GSM MUX protocol and	  presents the mux as a set of 61 individual tty devices. config TRACE_ROUTER	tristate "Trace data router for MIPI P1149.7 cJTAG standard"	depends on TRACE_SINK	default n	help	  The trace router uses the Linux tty line discipline framework to	  route trace data coming from a tty port (say UART for example) to	  the trace sink line discipline driver and to another tty port (say	  USB). This is part of a solution for the MIPI P1149.7, compact JTAG,	  standard, which is for debugging mobile devices. The PTI driver in	  drivers/misc/pti.c defines the majority of this MIPI solution. 	  You should select this driver if the target kernel is meant for	  a mobile device containing a modem.  Then you will need to select	  "Trace data sink for MIPI P1149.7 cJTAG standard" line discipline	  driver. config TRACE_SINK	tristate "Trace data sink for MIPI P1149.7 cJTAG standard"	default n	help	  The trace sink uses the Linux line discipline framework to receive	  trace data coming from the trace router line discipline driver	  to a user-defined tty port target, like USB.	  This is to provide a way to extract modem trace data on	  devices that do not have a PTI HW module, or just need modem	  trace data to come out of a different HW output port.	  This is part of a solution for the P1149.7, compact JTAG, standard. 	  If you select this option, you need to select	  "Trace data router for MIPI P1149.7 cJTAG standard". config PPC_EPAPR_HV_BYTECHAN	tristate "ePAPR hypervisor byte channel driver"	depends on PPC	select EPAPR_PARAVIRT	help	  This driver creates /dev entries for each ePAPR hypervisor byte	  channel, thereby allowing applications to communicate with byte	  channels as if they were serial ports. config PPC_EARLY_DEBUG_EHV_BC	bool "Early console (udbg) support for ePAPR hypervisors"	depends on PPC_EPAPR_HV_BYTECHAN=y	help	  Select this option to enable early console (a.k.a. "udbg") support	  via an ePAPR byte channel.  You also need to choose the byte channel	  handle below. config PPC_EARLY_DEBUG_EHV_BC_HANDLE	int "Byte channel handle for early console (udbg)"	depends on PPC_EARLY_DEBUG_EHV_BC	default 0	help	  If you want early console (udbg) output through a byte channel,	  specify the handle of the byte channel to use. 	  For this to work, the byte channel driver must be compiled	  in-kernel, not as a module. 	  Note that only one early console driver can be enabled, so don't	  enable any others if you enable this one. 	  If the number you specify is not a valid byte channel handle, then	  there simply will be no early console output.  This is true also	  if you don't boot under a hypervisor at all. config GOLDFISH_TTY	tristate "Goldfish TTY Driver"	depends on GOLDFISH	help	  Console and system TTY driver for the Goldfish virtual platform. config DA_TTY	bool "DA TTY"	depends on METAG_DA	select SERIAL_NONSTANDARD	help	  This enables a TTY on a Dash channel. config DA_CONSOLE	bool "DA Console"	depends on DA_TTY	help	  This enables a console on a Dash channel. endif # TTY