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  1 config TTY
  2         bool "Enable TTY" if EXPERT
  3         default y
  4         ---help---
  5           Allows you to remove TTY support which can save space, and
  6           blocks features that require TTY from inclusion in the kernel.
  7           TTY is required for any text terminals or serial port
  8           communication. Most users should leave this enabled.
 10 if TTY
 12 config VT
 13         bool "Virtual terminal" if EXPERT
 14         depends on !S390 && !UML
 15         select INPUT
 16         default y
 17         ---help---
 18           If you say Y here, you will get support for terminal devices with
 19           display and keyboard devices. These are called "virtual" because you
 20           can run several virtual terminals (also called virtual consoles) on
 21           one physical terminal. This is rather useful, for example one
 22           virtual terminal can collect system messages and warnings, another
 23           one can be used for a text-mode user session, and a third could run
 24           an X session, all in parallel. Switching between virtual terminals
 25           is done with certain key combinations, usually Alt-<function key>.
 27           The setterm command ("man setterm") can be used to change the
 28           properties (such as colors or beeping) of a virtual terminal. The
 29           man page console_codes(4) ("man console_codes") contains the special
 30           character sequences that can be used to change those properties
 31           directly. The fonts used on virtual terminals can be changed with
 32           the setfont ("man setfont") command and the key bindings are defined
 33           with the loadkeys ("man loadkeys") command.
 35           You need at least one virtual terminal device in order to make use
 36           of your keyboard and monitor. Therefore, only people configuring an
 37           embedded system would want to say N here in order to save some
 38           memory; the only way to log into such a system is then via a serial
 39           or network connection.
 41           If unsure, say Y, or else you won't be able to do much with your new
 42           shiny Linux system :-)
 45         depends on VT
 46         default y
 47         bool "Enable character translations in console" if EXPERT
 48         ---help---
 49           This enables support for font mapping and Unicode translation
 50           on virtual consoles.
 52 config VT_CONSOLE
 53         bool "Support for console on virtual terminal" if EXPERT
 54         depends on VT
 55         default y
 56         ---help---
 57           The system console is the device which receives all kernel messages
 58           and warnings and which allows logins in single user mode. If you
 59           answer Y here, a virtual terminal (the device used to interact with
 60           a physical terminal) can be used as system console. This is the most
 61           common mode of operations, so you should say Y here unless you want
 62           the kernel messages be output only to a serial port (in which case
 63           you should say Y to "Console on serial port", below).
 65           If you do say Y here, by default the currently visible virtual
 66           terminal (/dev/tty0) will be used as system console. You can change
 67           that with a kernel command line option such as "console=tty3" which
 68           would use the third virtual terminal as system console. (Try "man
 69           bootparam" or see the documentation of your boot loader (lilo or
 70           loadlin) about how to pass options to the kernel at boot time.)
 72           If unsure, say Y.
 75         def_bool y
 76         depends on VT_CONSOLE && PM_SLEEP
 78 config HW_CONSOLE
 79         bool
 80         depends on VT && !UML
 81         default y
 84        bool "Support for binding and unbinding console drivers"
 85        depends on HW_CONSOLE
 86        default n
 87        ---help---
 88          The virtual terminal is the device that interacts with the physical
 89          terminal through console drivers. On these systems, at least one
 90          console driver is loaded. In other configurations, additional console
 91          drivers may be enabled, such as the framebuffer console. If more than
 92          1 console driver is enabled, setting this to 'y' will allow you to
 93          select the console driver that will serve as the backend for the
 94          virtual terminals.
 96          See <file:Documentation/console/console.txt> for more
 97          information. For framebuffer console users, please refer to
 98          <file:Documentation/fb/fbcon.txt>.
100 config UNIX98_PTYS
101         bool "Unix98 PTY support" if EXPERT
102         default y
103         ---help---
104           A pseudo terminal (PTY) is a software device consisting of two
105           halves: a master and a slave. The slave device behaves identical to
106           a physical terminal; the master device is used by a process to
107           read data from and write data to the slave, thereby emulating a
108           terminal. Typical programs for the master side are telnet servers
109           and xterms.
111           Linux has traditionally used the BSD-like names /dev/ptyxx for
112           masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
113           has a number of problems. The GNU C library glibc 2.1 and later,
114           however, supports the Unix98 naming standard: in order to acquire a
115           pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
116           terminal is then made available to the process and the pseudo
117           terminal slave can be accessed as /dev/pts/<number>. What was
118           traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
120           All modern Linux systems use the Unix98 ptys.  Say Y unless
121           you're on an embedded system and want to conserve memory.
124         bool "Support multiple instances of devpts"
125         depends on UNIX98_PTYS
126         default n
127         ---help---
128           Enable support for multiple instances of devpts filesystem.
129           If you want to have isolated PTY namespaces (eg: in containers),
130           say Y here.  Otherwise, say N. If enabled, each mount of devpts
131           filesystem with the '-o newinstance' option will create an
132           independent PTY namespace.
134 config LEGACY_PTYS
135         bool "Legacy (BSD) PTY support"
136         default y
137         ---help---
138           A pseudo terminal (PTY) is a software device consisting of two
139           halves: a master and a slave. The slave device behaves identical to
140           a physical terminal; the master device is used by a process to
141           read data from and write data to the slave, thereby emulating a
142           terminal. Typical programs for the master side are telnet servers
143           and xterms.
145           Linux has traditionally used the BSD-like names /dev/ptyxx
146           for masters and /dev/ttyxx for slaves of pseudo
147           terminals. This scheme has a number of problems, including
148           security.  This option enables these legacy devices; on most
149           systems, it is safe to say N.
153         int "Maximum number of legacy PTY in use"
154         depends on LEGACY_PTYS
155         range 0 256
156         default "256"
157         ---help---
158           The maximum number of legacy PTYs that can be used at any one time.
159           The default is 256, and should be more than enough.  Embedded
160           systems may want to reduce this to save memory.
162           When not in use, each legacy PTY occupies 12 bytes on 32-bit
163           architectures and 24 bytes on 64-bit architectures.
165 config BFIN_JTAG_COMM
166         tristate "Blackfin JTAG Communication"
167         depends on BLACKFIN
168         help
169           Add support for emulating a TTY device over the Blackfin JTAG.
171           To compile this driver as a module, choose M here: the
172           module will be called bfin_jtag_comm.
175         bool "Console on Blackfin JTAG"
176         depends on BFIN_JTAG_COMM=y
179         bool "Non-standard serial port support"
180         depends on HAS_IOMEM
181         ---help---
182           Say Y here if you have any non-standard serial boards -- boards
183           which aren't supported using the standard "dumb" serial driver.
184           This includes intelligent serial boards such as Cyclades,
185           Digiboards, etc. These are usually used for systems that need many
186           serial ports because they serve many terminals or dial-in
187           connections.
189           Note that the answer to this question won't directly affect the
190           kernel: saying N will just cause the configurator to skip all
191           the questions about non-standard serial boards.
193           Most people can say N here.
195 config ROCKETPORT
196         tristate "Comtrol RocketPort support"
197         depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
198         help
199           This driver supports Comtrol RocketPort and RocketModem PCI boards.   
200           These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
201           modems.  For information about the RocketPort/RocketModem  boards
202           and this driver read <file:Documentation/serial/rocket.txt>.
204           To compile this driver as a module, choose M here: the
205           module will be called rocket.
207           If you want to compile this driver into the kernel, say Y here.  If
208           you don't have a Comtrol RocketPort/RocketModem card installed, say N.
210 config CYCLADES
211         tristate "Cyclades async mux support"
212         depends on SERIAL_NONSTANDARD && (PCI || ISA)
213         select FW_LOADER
214         ---help---
215           This driver supports Cyclades Z and Y multiserial boards.
216           You would need something like this to connect more than two modems to
217           your Linux box, for instance in order to become a dial-in server.
219           For information about the Cyclades-Z card, read
220           <file:Documentation/serial/README.cycladesZ>.
222           To compile this driver as a module, choose M here: the
223           module will be called cyclades.
225           If you haven't heard about it, it's safe to say N.
227 config CYZ_INTR
228         bool "Cyclades-Z interrupt mode operation"
229         depends on CYCLADES && PCI
230         help
231           The Cyclades-Z family of multiport cards allows 2 (two) driver op
232           modes: polling and interrupt. In polling mode, the driver will check
233           the status of the Cyclades-Z ports every certain amount of time
234           (which is called polling cycle and is configurable). In interrupt
235           mode, it will use an interrupt line (IRQ) in order to check the
236           status of the Cyclades-Z ports. The default op mode is polling. If
237           unsure, say N.
239 config MOXA_INTELLIO
240         tristate "Moxa Intellio support"
241         depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
242         select FW_LOADER
243         help
244           Say Y here if you have a Moxa Intellio multiport serial card.
246           To compile this driver as a module, choose M here: the
247           module will be called moxa.
249 config MOXA_SMARTIO
250         tristate "Moxa SmartIO support v. 2.0"
251         depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
252         help
253           Say Y here if you have a Moxa SmartIO multiport serial card and/or
254           want to help develop a new version of this driver.
256           This is upgraded (1.9.1) driver from original Moxa drivers with
257           changes finally resulting in PCI probing.
259           This driver can also be built as a module. The module will be called
260           mxser. If you want to do that, say M here.
262 config SYNCLINK
263         tristate "Microgate SyncLink card support"
264         depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
265         help
266           Provides support for the SyncLink ISA and PCI multiprotocol serial
267           adapters. These adapters support asynchronous and HDLC bit
268           synchronous communication up to 10Mbps (PCI adapter).
270           This driver can only be built as a module ( = code which can be
271           inserted in and removed from the running kernel whenever you want).
272           The module will be called synclink.  If you want to do that, say M
273           here.
275 config SYNCLINKMP
276         tristate "SyncLink Multiport support"
277         depends on SERIAL_NONSTANDARD && PCI
278         help
279           Enable support for the SyncLink Multiport (2 or 4 ports)
280           serial adapter, running asynchronous and HDLC communications up
281           to 2.048Mbps. Each ports is independently selectable for
282           RS-232, V.35, RS-449, RS-530, and X.21
284           This driver may be built as a module ( = code which can be
285           inserted in and removed from the running kernel whenever you want).
286           The module will be called synclinkmp.  If you want to do that, say M
287           here.
289 config SYNCLINK_GT
290         tristate "SyncLink GT/AC support"
291         depends on SERIAL_NONSTANDARD && PCI
292         help
293           Support for SyncLink GT and SyncLink AC families of
294           synchronous and asynchronous serial adapters
295           manufactured by Microgate Systems, Ltd. (
297 config NOZOMI
298         tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
299         depends on PCI
300         help
301           If you have a HSDPA driver Broadband Wireless Data Card -
302           Globe Trotter PCMCIA card, say Y here.
304           To compile this driver as a module, choose M here, the module
305           will be called nozomi.
307 config ISI
308         tristate "Multi-Tech multiport card support"
309         depends on SERIAL_NONSTANDARD && PCI
310         select FW_LOADER
311         help
312           This is a driver for the Multi-Tech cards which provide several
313           serial ports.  The driver is experimental and can currently only be
314           built as a module. The module will be called isicom.
315           If you want to do that, choose M here.
317 config N_HDLC
318         tristate "HDLC line discipline support"
319         depends on SERIAL_NONSTANDARD
320         help
321           Allows synchronous HDLC communications with tty device drivers that
322           support synchronous HDLC such as the Microgate SyncLink adapter.
324           This driver can be built as a module ( = code which can be
325           inserted in and removed from the running kernel whenever you want).
326           The module will be called n_hdlc. If you want to do that, say M
327           here.
329 config N_GSM
330         tristate "GSM MUX line discipline support (EXPERIMENTAL)"
331         depends on NET
332         help
333           This line discipline provides support for the GSM MUX protocol and
334           presents the mux as a set of 61 individual tty devices.
336 config TRACE_ROUTER
337         tristate "Trace data router for MIPI P1149.7 cJTAG standard"
338         depends on TRACE_SINK
339         default n
340         help
341           The trace router uses the Linux tty line discipline framework to
342           route trace data coming from a tty port (say UART for example) to
343           the trace sink line discipline driver and to another tty port (say
344           USB). This is part of a solution for the MIPI P1149.7, compact JTAG,
345           standard, which is for debugging mobile devices. The PTI driver in
346           drivers/misc/pti.c defines the majority of this MIPI solution.
348           You should select this driver if the target kernel is meant for
349           a mobile device containing a modem.  Then you will need to select
350           "Trace data sink for MIPI P1149.7 cJTAG standard" line discipline
351           driver.
353 config TRACE_SINK
354         tristate "Trace data sink for MIPI P1149.7 cJTAG standard"
355         default n
356         help
357           The trace sink uses the Linux line discipline framework to receive
358           trace data coming from the trace router line discipline driver
359           to a user-defined tty port target, like USB.
360           This is to provide a way to extract modem trace data on
361           devices that do not have a PTI HW module, or just need modem
362           trace data to come out of a different HW output port.
363           This is part of a solution for the P1149.7, compact JTAG, standard.
365           If you select this option, you need to select
366           "Trace data router for MIPI P1149.7 cJTAG standard".
369         bool "ePAPR hypervisor byte channel driver"
370         depends on PPC
371         select EPAPR_PARAVIRT
372         help
373           This driver creates /dev entries for each ePAPR hypervisor byte
374           channel, thereby allowing applications to communicate with byte
375           channels as if they were serial ports.
378         bool "Early console (udbg) support for ePAPR hypervisors"
379         depends on PPC_EPAPR_HV_BYTECHAN=y
380         help
381           Select this option to enable early console (a.k.a. "udbg") support
382           via an ePAPR byte channel.  You also need to choose the byte channel
383           handle below.
386         int "Byte channel handle for early console (udbg)"
387         depends on PPC_EARLY_DEBUG_EHV_BC
388         default 0
389         help
390           If you want early console (udbg) output through a byte channel,
391           specify the handle of the byte channel to use.
393           For this to work, the byte channel driver must be compiled
394           in-kernel, not as a module.
396           Note that only one early console driver can be enabled, so don't
397           enable any others if you enable this one.
399           If the number you specify is not a valid byte channel handle, then
400           there simply will be no early console output.  This is true also
401           if you don't boot under a hypervisor at all.
403 config GOLDFISH_TTY
404         tristate "Goldfish TTY Driver"
405         depends on GOLDFISH
406         help
407           Console and system TTY driver for the Goldfish virtual platform.
409 config DA_TTY
410         bool "DA TTY"
411         depends on METAG_DA
412         select SERIAL_NONSTANDARD
413         help
414           This enables a TTY on a Dash channel.
416 config DA_CONSOLE
417         bool "DA Console"
418         depends on DA_TTY
419         help
420           This enables a console on a Dash channel.
423         bool "MIPS EJTAG Fast Debug Channel TTY"
424         depends on MIPS_CDMM
425         help
426           This enables a TTY and console on the MIPS EJTAG Fast Debug Channels,
427           if they are present. This can be useful when working with an EJTAG
428           probe which supports it, to get console output and a login prompt via
429           EJTAG without needing to connect a serial cable.
431           TTY devices are named e.g. ttyFDC3c2 (for FDC channel 2 of the FDC on
432           CPU3).
434           The console can be enabled with console=fdc1 (for FDC channel 1 on all
435           CPUs). Do not use the console unless there is a debug probe attached
436           to drain the FDC TX FIFO.
438           If unsure, say N.
441         bool "Early FDC console"
442         depends on MIPS_EJTAG_FDC_TTY
443         help
444           This registers a console on FDC channel 1 very early during boot (from
445           MIPS arch code). This is useful for bring-up and debugging early boot
446           issues.
448           Do not enable unless there is a debug probe attached to drain the FDC
449           TX FIFO.
451           If unsure, say N.
454         bool "Use KGDB over an FDC channel"
455         depends on MIPS_EJTAG_FDC_TTY && KGDB
456         default y
457         help
458           This enables the use of KGDB over an FDC channel, allowing KGDB to be
459           used remotely or when a serial port isn't available.
462         int "KGDB FDC channel"
463         depends on MIPS_EJTAG_FDC_KGDB
464         range 2 15
465         default 3
466         help
467           FDC channel number to use for KGDB.
469 endif # TTY

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