2 bool "Virtual terminal" if EXPERT
3 depends on !S390 && !UML
7 If you say Y here, you will get support for terminal devices with
8 display and keyboard devices. These are called "virtual" because you
9 can run several virtual terminals (also called virtual consoles) on
10 one physical terminal. This is rather useful, for example one
11 virtual terminal can collect system messages and warnings, another
12 one can be used for a text-mode user session, and a third could run
13 an X session, all in parallel. Switching between virtual terminals
14 is done with certain key combinations, usually Alt-<function key>.
16 The setterm command ("man setterm") can be used to change the
17 properties (such as colors or beeping) of a virtual terminal. The
18 man page console_codes(4) ("man console_codes") contains the special
19 character sequences that can be used to change those properties
20 directly. The fonts used on virtual terminals can be changed with
21 the setfont ("man setfont") command and the key bindings are defined
22 with the loadkeys ("man loadkeys") command.
24 You need at least one virtual terminal device in order to make use
25 of your keyboard and monitor. Therefore, only people configuring an
26 embedded system would want to say N here in order to save some
27 memory; the only way to log into such a system is then via a serial
28 or network connection.
30 If unsure, say Y, or else you won't be able to do much with your new
31 shiny Linux system :-)
33 config CONSOLE_TRANSLATIONS
36 bool "Enable character translations in console" if EXPERT
38 This enables support for font mapping and Unicode translation
42 bool "Support for console on virtual terminal" if EXPERT
46 The system console is the device which receives all kernel messages
47 and warnings and which allows logins in single user mode. If you
48 answer Y here, a virtual terminal (the device used to interact with
49 a physical terminal) can be used as system console. This is the most
50 common mode of operations, so you should say Y here unless you want
51 the kernel messages be output only to a serial port (in which case
52 you should say Y to "Console on serial port", below).
54 If you do say Y here, by default the currently visible virtual
55 terminal (/dev/tty0) will be used as system console. You can change
56 that with a kernel command line option such as "console=tty3" which
57 would use the third virtual terminal as system console. (Try "man
58 bootparam" or see the documentation of your boot loader (lilo or
59 loadlin) about how to pass options to the kernel at boot time.)
63 config VT_CONSOLE_SLEEP
65 depends on VT_CONSOLE && PM_SLEEP
68 bool "Colored kernel message output"
71 This option enables kernel messages to be emitted in
72 colors other than the default.
74 The color value you need to enter is composed (OR-ed)
75 of a foreground and a background color.
78 0x00 = black, 0x08 = dark gray,
79 0x01 = red, 0x09 = light red,
80 0x02 = green, 0x0A = light green,
81 0x03 = brown, 0x0B = yellow,
82 0x04 = blue, 0x0C = light blue,
83 0x05 = magenta, 0x0D = light magenta,
84 0x06 = cyan, 0x0E = light cyan,
85 0x07 = gray, 0x0F = white,
87 (Foreground colors 0x08 to 0x0F do not work when a VGA
88 console font with 512 glyphs is used.)
91 0x00 = black, 0x40 = blue,
92 0x10 = red, 0x50 = magenta,
93 0x20 = green, 0x60 = cyan,
94 0x30 = brown, 0x70 = gray,
96 For example, 0x1F would yield white on red.
100 config VT_PRINTK_EMERG_COLOR
101 hex "Emergency messages color"
106 This option defines with which color kernel emergency messages will
107 be printed to the console.
109 config VT_PRINTK_ALERT_COLOR
110 hex "Alert messages color"
115 This option defines with which color kernel alert messages will
116 be printed to the console.
118 config VT_PRINTK_CRIT_COLOR
119 hex "Critical messages color"
124 This option defines with which color kernel critical messages will
125 be printed to the console.
127 config VT_PRINTK_ERR_COLOR
128 hex "Error messages color"
133 This option defines with which color kernel error messages will
134 be printed to the console.
136 config VT_PRINTK_WARNING_COLOR
137 hex "Warning messages color"
142 This option defines with which color kernel warning messages will
143 be printed to the console.
145 config VT_PRINTK_NOTICE_COLOR
146 hex "Notice messages color"
151 This option defines with which color kernel notice messages will
152 be printed to the console.
154 config VT_PRINTK_INFO_COLOR
155 hex "Information messages color"
160 This option defines with which color kernel information messages will
161 be printed to the console.
163 config VT_PRINTK_DEBUG_COLOR
164 hex "Debug messages color"
169 This option defines with which color kernel debug messages will
170 be printed to the console.
172 config NR_TTY_DEVICES
173 int "Maximum tty device number"
178 This option is used to change the number of tty devices in /dev.
179 The default value is 63. The lowest number you can set is 12,
180 63 is also the upper limit so we don't overrun the serial
187 depends on VT && !UML
190 config VT_HW_CONSOLE_BINDING
191 bool "Support for binding and unbinding console drivers"
192 depends on HW_CONSOLE
195 The virtual terminal is the device that interacts with the physical
196 terminal through console drivers. On these systems, at least one
197 console driver is loaded. In other configurations, additional console
198 drivers may be enabled, such as the framebuffer console. If more than
199 1 console driver is enabled, setting this to 'y' will allow you to
200 select the console driver that will serve as the backend for the
203 See <file:Documentation/console/console.txt> for more
204 information. For framebuffer console users, please refer to
205 <file:Documentation/fb/fbcon.txt>.
208 bool "Unix98 PTY support" if EXPERT
211 A pseudo terminal (PTY) is a software device consisting of two
212 halves: a master and a slave. The slave device behaves identical to
213 a physical terminal; the master device is used by a process to
214 read data from and write data to the slave, thereby emulating a
215 terminal. Typical programs for the master side are telnet servers
218 Linux has traditionally used the BSD-like names /dev/ptyxx for
219 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
220 has a number of problems. The GNU C library glibc 2.1 and later,
221 however, supports the Unix98 naming standard: in order to acquire a
222 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
223 terminal is then made available to the process and the pseudo
224 terminal slave can be accessed as /dev/pts/<number>. What was
225 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
227 All modern Linux systems use the Unix98 ptys. Say Y unless
228 you're on an embedded system and want to conserve memory.
230 config DEVPTS_MULTIPLE_INSTANCES
231 bool "Support multiple instances of devpts"
232 depends on UNIX98_PTYS
235 Enable support for multiple instances of devpts filesystem.
236 If you want to have isolated PTY namespaces (eg: in containers),
237 say Y here. Otherwise, say N. If enabled, each mount of devpts
238 filesystem with the '-o newinstance' option will create an
239 independent PTY namespace.
242 bool "Legacy (BSD) PTY support"
245 A pseudo terminal (PTY) is a software device consisting of two
246 halves: a master and a slave. The slave device behaves identical to
247 a physical terminal; the master device is used by a process to
248 read data from and write data to the slave, thereby emulating a
249 terminal. Typical programs for the master side are telnet servers
252 Linux has traditionally used the BSD-like names /dev/ptyxx
253 for masters and /dev/ttyxx for slaves of pseudo
254 terminals. This scheme has a number of problems, including
255 security. This option enables these legacy devices; on most
256 systems, it is safe to say N.
259 config LEGACY_PTY_COUNT
260 int "Maximum number of legacy PTY in use"
261 depends on LEGACY_PTYS
265 The maximum number of legacy PTYs that can be used at any one time.
266 The default is 256, and should be more than enough. Embedded
267 systems may want to reduce this to save memory.
269 When not in use, each legacy PTY occupies 12 bytes on 32-bit
270 architectures and 24 bytes on 64-bit architectures.
272 config BFIN_JTAG_COMM
273 tristate "Blackfin JTAG Communication"
276 Add support for emulating a TTY device over the Blackfin JTAG.
278 To compile this driver as a module, choose M here: the
279 module will be called bfin_jtag_comm.
281 config BFIN_JTAG_COMM_CONSOLE
282 bool "Console on Blackfin JTAG"
283 depends on BFIN_JTAG_COMM=y
285 config SERIAL_NONSTANDARD
286 bool "Non-standard serial port support"
289 Say Y here if you have any non-standard serial boards -- boards
290 which aren't supported using the standard "dumb" serial driver.
291 This includes intelligent serial boards such as Cyclades,
292 Digiboards, etc. These are usually used for systems that need many
293 serial ports because they serve many terminals or dial-in
296 Note that the answer to this question won't directly affect the
297 kernel: saying N will just cause the configurator to skip all
298 the questions about non-standard serial boards.
300 Most people can say N here.
303 tristate "Comtrol RocketPort support"
304 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
306 This driver supports Comtrol RocketPort and RocketModem PCI boards.
307 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
308 modems. For information about the RocketPort/RocketModem boards
309 and this driver read <file:Documentation/serial/rocket.txt>.
311 To compile this driver as a module, choose M here: the
312 module will be called rocket.
314 If you want to compile this driver into the kernel, say Y here. If
315 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
318 tristate "Cyclades async mux support"
319 depends on SERIAL_NONSTANDARD && (PCI || ISA)
322 This driver supports Cyclades Z and Y multiserial boards.
323 You would need something like this to connect more than two modems to
324 your Linux box, for instance in order to become a dial-in server.
326 For information about the Cyclades-Z card, read
327 <file:Documentation/serial/README.cycladesZ>.
329 To compile this driver as a module, choose M here: the
330 module will be called cyclades.
332 If you haven't heard about it, it's safe to say N.
335 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
336 depends on EXPERIMENTAL && CYCLADES
338 The Cyclades-Z family of multiport cards allows 2 (two) driver op
339 modes: polling and interrupt. In polling mode, the driver will check
340 the status of the Cyclades-Z ports every certain amount of time
341 (which is called polling cycle and is configurable). In interrupt
342 mode, it will use an interrupt line (IRQ) in order to check the
343 status of the Cyclades-Z ports. The default op mode is polling. If
347 tristate "Moxa Intellio support"
348 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
351 Say Y here if you have a Moxa Intellio multiport serial card.
353 To compile this driver as a module, choose M here: the
354 module will be called moxa.
357 tristate "Moxa SmartIO support v. 2.0"
358 depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
360 Say Y here if you have a Moxa SmartIO multiport serial card and/or
361 want to help develop a new version of this driver.
363 This is upgraded (1.9.1) driver from original Moxa drivers with
364 changes finally resulting in PCI probing.
366 This driver can also be built as a module. The module will be called
367 mxser. If you want to do that, say M here.
370 tristate "Microgate SyncLink card support"
371 depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
373 Provides support for the SyncLink ISA and PCI multiprotocol serial
374 adapters. These adapters support asynchronous and HDLC bit
375 synchronous communication up to 10Mbps (PCI adapter).
377 This driver can only be built as a module ( = code which can be
378 inserted in and removed from the running kernel whenever you want).
379 The module will be called synclink. If you want to do that, say M
383 tristate "SyncLink Multiport support"
384 depends on SERIAL_NONSTANDARD && PCI
386 Enable support for the SyncLink Multiport (2 or 4 ports)
387 serial adapter, running asynchronous and HDLC communications up
388 to 2.048Mbps. Each ports is independently selectable for
389 RS-232, V.35, RS-449, RS-530, and X.21
391 This driver may be built as a module ( = code which can be
392 inserted in and removed from the running kernel whenever you want).
393 The module will be called synclinkmp. If you want to do that, say M
397 tristate "SyncLink GT/AC support"
398 depends on SERIAL_NONSTANDARD && PCI
400 Support for SyncLink GT and SyncLink AC families of
401 synchronous and asynchronous serial adapters
402 manufactured by Microgate Systems, Ltd. (www.microgate.com)
405 tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
406 depends on PCI && EXPERIMENTAL
408 If you have a HSDPA driver Broadband Wireless Data Card -
409 Globe Trotter PCMCIA card, say Y here.
411 To compile this driver as a module, choose M here, the module
412 will be called nozomi.
415 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
416 depends on SERIAL_NONSTANDARD && PCI
419 This is a driver for the Multi-Tech cards which provide several
420 serial ports. The driver is experimental and can currently only be
421 built as a module. The module will be called isicom.
422 If you want to do that, choose M here.
425 tristate "HDLC line discipline support"
426 depends on SERIAL_NONSTANDARD
428 Allows synchronous HDLC communications with tty device drivers that
429 support synchronous HDLC such as the Microgate SyncLink adapter.
431 This driver can be built as a module ( = code which can be
432 inserted in and removed from the running kernel whenever you want).
433 The module will be called n_hdlc. If you want to do that, say M
437 tristate "GSM MUX line discipline support (EXPERIMENTAL)"
438 depends on EXPERIMENTAL
441 This line discipline provides support for the GSM MUX protocol and
442 presents the mux as a set of 61 individual tty devices.
445 tristate "Trace data router for MIPI P1149.7 cJTAG standard"
446 depends on TRACE_SINK
449 The trace router uses the Linux tty line discipline framework to
450 route trace data coming from a tty port (say UART for example) to
451 the trace sink line discipline driver and to another tty port (say
452 USB). This is part of a solution for the MIPI P1149.7, compact JTAG,
453 standard, which is for debugging mobile devices. The PTI driver in
454 drivers/misc/pti.c defines the majority of this MIPI solution.
456 You should select this driver if the target kernel is meant for
457 a mobile device containing a modem. Then you will need to select
458 "Trace data sink for MIPI P1149.7 cJTAG standard" line discipline
462 tristate "Trace data sink for MIPI P1149.7 cJTAG standard"
465 The trace sink uses the Linux line discipline framework to receive
466 trace data coming from the trace router line discipline driver
467 to a user-defined tty port target, like USB.
468 This is to provide a way to extract modem trace data on
469 devices that do not have a PTI HW module, or just need modem
470 trace data to come out of a different HW output port.
471 This is part of a solution for the P1149.7, compact JTAG, standard.
473 If you select this option, you need to select
474 "Trace data router for MIPI P1149.7 cJTAG standard".
476 config PPC_EPAPR_HV_BYTECHAN
477 tristate "ePAPR hypervisor byte channel driver"
480 This driver creates /dev entries for each ePAPR hypervisor byte
481 channel, thereby allowing applications to communicate with byte
482 channels as if they were serial ports.
484 config PPC_EARLY_DEBUG_EHV_BC
485 bool "Early console (udbg) support for ePAPR hypervisors"
486 depends on PPC_EPAPR_HV_BYTECHAN=y
488 Select this option to enable early console (a.k.a. "udbg") support
489 via an ePAPR byte channel. You also need to choose the byte channel
492 config PPC_EARLY_DEBUG_EHV_BC_HANDLE
493 int "Byte channel handle for early console (udbg)"
494 depends on PPC_EARLY_DEBUG_EHV_BC
497 If you want early console (udbg) output through a byte channel,
498 specify the handle of the byte channel to use.
500 For this to work, the byte channel driver must be compiled
501 in-kernel, not as a module.
503 Note that only one early console driver can be enabled, so don't
504 enable any others if you enable this one.
506 If the number you specify is not a valid byte channel handle, then
507 there simply will be no early console output. This is true also
508 if you don't boot under a hypervisor at all.