2 # Character device configuration
5 menu "Character devices"
8 bool "Virtual terminal" if EMBEDDED
12 If you say Y here, you will get support for terminal devices with
13 display and keyboard devices. These are called "virtual" because you
14 can run several virtual terminals (also called virtual consoles) on
15 one physical terminal. This is rather useful, for example one
16 virtual terminal can collect system messages and warnings, another
17 one can be used for a text-mode user session, and a third could run
18 an X session, all in parallel. Switching between virtual terminals
19 is done with certain key combinations, usually Alt-<function key>.
21 The setterm command ("man setterm") can be used to change the
22 properties (such as colors or beeping) of a virtual terminal. The
23 man page console_codes(4) ("man console_codes") contains the special
24 character sequences that can be used to change those properties
25 directly. The fonts used on virtual terminals can be changed with
26 the setfont ("man setfont") command and the key bindings are defined
27 with the loadkeys ("man loadkeys") command.
29 You need at least one virtual terminal device in order to make use
30 of your keyboard and monitor. Therefore, only people configuring an
31 embedded system would want to say N here in order to save some
32 memory; the only way to log into such a system is then via a serial
33 or network connection.
35 If unsure, say Y, or else you won't be able to do much with your new
36 shiny Linux system :-)
39 bool "Support for console on virtual terminal" if EMBEDDED
43 The system console is the device which receives all kernel messages
44 and warnings and which allows logins in single user mode. If you
45 answer Y here, a virtual terminal (the device used to interact with
46 a physical terminal) can be used as system console. This is the most
47 common mode of operations, so you should say Y here unless you want
48 the kernel messages be output only to a serial port (in which case
49 you should say Y to "Console on serial port", below).
51 If you do say Y here, by default the currently visible virtual
52 terminal (/dev/tty0) will be used as system console. You can change
53 that with a kernel command line option such as "console=tty3" which
54 would use the third virtual terminal as system console. (Try "man
55 bootparam" or see the documentation of your boot loader (lilo or
56 loadlin) about how to pass options to the kernel at boot time.)
62 depends on VT && !S390 && !USERMODE
65 config SERIAL_NONSTANDARD
66 bool "Non-standard serial port support"
68 Say Y here if you have any non-standard serial boards -- boards
69 which aren't supported using the standard "dumb" serial driver.
70 This includes intelligent serial boards such as Cyclades,
71 Digiboards, etc. These are usually used for systems that need many
72 serial ports because they serve many terminals or dial-in
75 Note that the answer to this question won't directly affect the
76 kernel: saying N will just cause the configurator to skip all
77 the questions about non-standard serial boards.
79 Most people can say N here.
82 tristate "Computone IntelliPort Plus serial support"
83 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
85 This driver supports the entire family of Intelliport II/Plus
86 controllers with the exception of the MicroChannel controllers and
87 products previous to the Intelliport II. These are multiport cards,
88 which give you many serial ports. You would need something like this
89 to connect more than two modems to your Linux box, for instance in
90 order to become a dial-in server. If you have a card like that, say
91 Y here and read <file:Documentation/computone.txt>.
93 To compile this driver as modules, choose M here: the
94 modules will be called ip2 and ip2main.
97 tristate "Comtrol RocketPort support"
98 depends on SERIAL_NONSTANDARD
100 This driver supports Comtrol RocketPort and RocketModem PCI boards.
101 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
102 modems. For information about the RocketPort/RocketModem boards
103 and this driver read <file:Documentation/rocket.txt>.
105 To compile this driver as a module, choose M here: the
106 module will be called rocket.
108 If you want to compile this driver into the kernel, say Y here. If
109 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
112 tristate "Cyclades async mux support"
113 depends on SERIAL_NONSTANDARD
115 This driver supports Cyclades Z and Y multiserial boards.
116 You would need something like this to connect more than two modems to
117 your Linux box, for instance in order to become a dial-in server.
119 For information about the Cyclades-Z card, read
120 <file:drivers/char/README.cycladesZ>.
122 To compile this driver as a module, choose M here: the
123 module will be called cyclades.
125 If you haven't heard about it, it's safe to say N.
128 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
129 depends on EXPERIMENTAL && CYCLADES
131 The Cyclades-Z family of multiport cards allows 2 (two) driver op
132 modes: polling and interrupt. In polling mode, the driver will check
133 the status of the Cyclades-Z ports every certain amount of time
134 (which is called polling cycle and is configurable). In interrupt
135 mode, it will use an interrupt line (IRQ) in order to check the
136 status of the Cyclades-Z ports. The default op mode is polling. If
140 tristate "Digiboard Intelligent Async Support"
141 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
143 This is a driver for Digi International's Xx, Xeve, and Xem series
144 of cards which provide multiple serial ports. You would need
145 something like this to connect more than two modems to your Linux
146 box, for instance in order to become a dial-in server. This driver
147 supports the original PC (ISA) boards as well as PCI, and EISA. If
148 you have a card like this, say Y here and read the file
149 <file:Documentation/digiepca.txt>.
151 NOTE: There is another, separate driver for the Digiboard PC boards:
152 "Digiboard PC/Xx Support" below. You should (and can) only select
153 one of the two drivers.
155 To compile this driver as a module, choose M here: the
156 module will be called epca.
159 tristate "Digiboard PC/Xx Support"
160 depends on SERIAL_NONSTANDARD && DIGIEPCA=n && BROKEN_ON_SMP
162 This is a driver for the Digiboard PC/Xe, PC/Xi, and PC/Xeve cards
163 that give you many serial ports. You would need something like this
164 to connect more than two modems to your Linux box, for instance in
165 order to become a dial-in server. If you have a card like that, say
166 Y here and read the file <file:Documentation/digiboard.txt>.
168 To compile this driver as a module, choose M here: the
169 module will be called pcxx.
172 tristate "Hayes ESP serial port support"
173 depends on SERIAL_NONSTANDARD && ISA && BROKEN_ON_SMP
175 This is a driver which supports Hayes ESP serial ports. Both single
176 port cards and multiport cards are supported. Make sure to read
177 <file:Documentation/hayes-esp.txt>.
179 To compile this driver as a module, choose M here: the
180 module will be called esp.
185 tristate "Moxa Intellio support"
186 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
188 Say Y here if you have a Moxa Intellio multiport serial card.
190 To compile this driver as a module, choose M here: the
191 module will be called moxa.
194 tristate "Moxa SmartIO support"
195 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
197 Say Y here if you have a Moxa SmartIO multiport serial card.
199 This driver can also be built as a module ( = code which can be
200 inserted in and removed from the running kernel whenever you want).
201 The module will be called mxser. If you want to do that, say M
205 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
206 depends on SERIAL_NONSTANDARD && PCI && EXPERIMENTAL && BROKEN_ON_SMP && m
208 This is a driver for the Multi-Tech cards which provide several
209 serial ports. The driver is experimental and can currently only be
210 built as a module. The module will be called isicom.
211 If you want to do that, choose M here.
214 tristate "Microgate SyncLink card support"
215 depends on SERIAL_NONSTANDARD && PCI
217 Provides support for the SyncLink ISA and PCI multiprotocol serial
218 adapters. These adapters support asynchronous and HDLC bit
219 synchronous communication up to 10Mbps (PCI adapter).
221 This driver can only be built as a module ( = code which can be
222 inserted in and removed from the running kernel whenever you want).
223 The module will be called synclink. If you want to do that, say M
227 tristate "SyncLink Multiport support"
228 depends on SERIAL_NONSTANDARD
230 Enable support for the SyncLink Multiport (2 or 4 ports)
231 serial adapter, running asynchronous and HDLC communications up
232 to 2.048Mbps. Each ports is independently selectable for
233 RS-232, V.35, RS-449, RS-530, and X.21
235 This driver may be built as a module ( = code which can be
236 inserted in and removed from the running kernel whenever you want).
237 The module will be called synclinkmp. If you want to do that, say M
241 tristate "HDLC line discipline support"
242 depends on SERIAL_NONSTANDARD
244 Allows synchronous HDLC communications with tty device drivers that
245 support synchronous HDLC such as the Microgate SyncLink adapter.
247 This driver can only be built as a module ( = code which can be
248 inserted in and removed from the running kernel whenever you want).
249 The module will be called n_hdlc. If you want to do that, say M
253 tristate "SDL RISCom/8 card support"
254 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
256 This is a driver for the SDL Communications RISCom/8 multiport card,
257 which gives you many serial ports. You would need something like
258 this to connect more than two modems to your Linux box, for instance
259 in order to become a dial-in server. If you have a card like that,
260 say Y here and read the file <file:Documentation/riscom8.txt>.
262 Also it's possible to say M here and compile this driver as kernel
263 loadable module; the module will be called riscom8.
266 tristate "Specialix IO8+ card support"
267 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
269 This is a driver for the Specialix IO8+ multiport card (both the
270 ISA and the PCI version) which gives you many serial ports. You
271 would need something like this to connect more than two modems to
272 your Linux box, for instance in order to become a dial-in server.
274 If you have a card like that, say Y here and read the file
275 <file:Documentation/specialix.txt>. Also it's possible to say M here
276 and compile this driver as kernel loadable module which will be
279 config SPECIALIX_RTSCTS
280 bool "Specialix DTR/RTS pin is RTS"
283 The Specialix IO8+ card can only support either RTS or DTR. If you
284 say N here, the driver will use the pin as "DTR" when the tty is in
285 software handshake mode. If you say Y here or hardware handshake is
286 on, it will always be RTS. Read the file
287 <file:Documentation/specialix.txt> for more information.
290 tristate "Specialix SX (and SI) card support"
291 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
293 This is a driver for the SX and SI multiport serial cards.
294 Please read the file <file:Documentation/sx.txt> for details.
296 This driver can only be built as a module ( = code which can be
297 inserted in and removed from the running kernel whenever you want).
298 The module will be called sx. If you want to do that, say M here.
301 tristate "Specialix RIO system support"
302 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
304 This is a driver for the Specialix RIO, a smart serial card which
305 drives an outboard box that can support up to 128 ports. Product
306 information is at <http://www.perle.com/support/documentation.html#multiport>.
307 There are both ISA and PCI versions.
310 bool "Support really old RIO/PCI cards"
313 Older RIO PCI cards need some initialization-time configuration to
314 determine the IRQ and some control addresses. If you have a RIO and
315 this doesn't seem to work, try setting this to Y.
318 bool "Stallion multiport serial support"
319 depends on SERIAL_NONSTANDARD
321 Stallion cards give you many serial ports. You would need something
322 like this to connect more than two modems to your Linux box, for
323 instance in order to become a dial-in server. If you say Y here,
324 you will be asked for your specific card model in the next
325 questions. Make sure to read <file:Documentation/stallion.txt> in
326 this case. If you have never heard about all this, it's safe to
330 tristate "Stallion EasyIO or EC8/32 support"
331 depends on STALDRV && BROKEN_ON_SMP
333 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
334 card, then this is for you; say Y. Make sure to read
335 <file:Documentation/stallion.txt>.
337 To compile this driver as a module, choose M here: the
338 module will be called stallion.
341 tristate "Stallion EC8/64, ONboard, Brumby support"
342 depends on STALDRV && BROKEN_ON_SMP
344 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
345 serial multiport card, say Y here. Make sure to read
346 <file:Documentation/stallion.txt>.
348 To compile this driver as a module, choose M here: the
349 module will be called istallion.
352 bool "TX3912/PR31700 serial port support"
353 depends on SERIAL_NONSTANDARD && MIPS && BROKEN_ON_SMP
355 The TX3912 is a Toshiba RISC processor based o the MIPS 3900 core;
356 see <http://www.toshiba.com/taec/components/Generic/risc/tx3912.htm>.
357 Say Y here to enable kernel support for the on-board serial port.
359 config SERIAL_TX3912_CONSOLE
360 bool "Console on TX3912/PR31700 serial port"
361 depends on SERIAL_TX3912
363 The TX3912 is a Toshiba RISC processor based o the MIPS 3900 core;
364 see <http://www.toshiba.com/taec/components/Generic/risc/tx3912.htm>.
365 Say Y here to direct console I/O to the on-board serial port.
368 bool "Enable Au1000 UART Support"
369 depends on SERIAL_NONSTANDARD && MIPS
371 If you have an Alchemy AU1000 processor (MIPS based) and you want
372 to use serial ports, say Y. Otherwise, say N.
374 config AU1000_SERIAL_CONSOLE
375 bool "Enable Au1000 serial console"
376 depends on AU1000_UART
378 If you have an Alchemy AU1000 processor (MIPS based) and you want
379 to use a console on a serial port, say Y. Otherwise, say N.
381 config QTRONIX_KEYBOARD
382 bool "Enable Qtronix 990P Keyboard Support"
385 Images of Qtronix keyboards are at
386 <http://www.qtronix.com/keyboard.html>.
390 depends on QTRONIX_KEYBOARD
394 bool "Enable Smart Card Reader 0 Support "
397 Say Y here to support smart-card reader 0 (SCR0) on the Integrated
398 Technology Express, Inc. ITE8172 SBC. Vendor page at
399 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
400 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
403 bool "Enable Smart Card Reader 1 Support "
406 Say Y here to support smart-card reader 1 (SCR1) on the Integrated
407 Technology Express, Inc. ITE8172 SBC. Vendor page at
408 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
409 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
412 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
413 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
415 This option supports the 2232 7-port serial card shipped with the
416 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
417 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
418 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
419 ports were connected with 8 pin DIN connectors on the card bracket,
420 for which 8 pin to DB25 adapters were supplied. The card also had
421 jumpers internally to toggle various pinning configurations.
423 This driver can be built as a module; but then "generic_serial"
424 will also be built as a module. This has to be loaded before
425 "ser_a2232". If you want to do this, answer M here.
428 bool "SGI Altix system controller communication support"
429 depends on (IA64_SGI_SN2 || IA64_GENERIC)
431 If you have an SGI Altix and you want to enable system
432 controller communication from user space (you want this!),
433 say Y. Otherwise, say N.
435 source "drivers/serial/Kconfig"
438 bool "Unix98 PTY support" if EMBEDDED
441 A pseudo terminal (PTY) is a software device consisting of two
442 halves: a master and a slave. The slave device behaves identical to
443 a physical terminal; the master device is used by a process to
444 read data from and write data to the slave, thereby emulating a
445 terminal. Typical programs for the master side are telnet servers
448 Linux has traditionally used the BSD-like names /dev/ptyxx for
449 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
450 has a number of problems. The GNU C library glibc 2.1 and later,
451 however, supports the Unix98 naming standard: in order to acquire a
452 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
453 terminal is then made available to the process and the pseudo
454 terminal slave can be accessed as /dev/pts/<number>. What was
455 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
457 All modern Linux systems use the Unix98 ptys. Say Y unless
458 you're on an embedded system and want to conserve memory.
461 bool "Legacy (BSD) PTY support"
464 A pseudo terminal (PTY) is a software device consisting of two
465 halves: a master and a slave. The slave device behaves identical to
466 a physical terminal; the master device is used by a process to
467 read data from and write data to the slave, thereby emulating a
468 terminal. Typical programs for the master side are telnet servers
471 Linux has traditionally used the BSD-like names /dev/ptyxx
472 for masters and /dev/ttyxx for slaves of pseudo
473 terminals. This scheme has a number of problems, including
474 security. This option enables these legacy devices; on most
475 systems, it is safe to say N.
478 config LEGACY_PTY_COUNT
479 int "Maximum number of legacy PTY in use"
480 depends on LEGACY_PTYS
483 The maximum number of legacy PTYs that can be used at any one time.
484 The default is 256, and should be more than enough. Embedded
485 systems may want to reduce this to save memory.
487 When not in use, each legacy PTY occupies 12 bytes on 32-bit
488 architectures and 24 bytes on 64-bit architectures.
491 tristate "Parallel printer support"
494 If you intend to attach a printer to the parallel port of your Linux
495 box (as opposed to using a serial printer; if the connector at the
496 printer has 9 or 25 holes ["female"], then it's serial), say Y.
497 Also read the Printing-HOWTO, available from
498 <http://www.tldp.org/docs.html#howto>.
500 It is possible to share one parallel port among several devices
501 (e.g. printer and ZIP drive) and it is safe to compile the
502 corresponding drivers into the kernel.
504 To compile this driver as a module, choose M here and read
505 <file:Documentation/parport.txt>. The module will be called lp.
507 If you have several parallel ports, you can specify which ports to
508 use with the "lp" kernel command line option. (Try "man bootparam"
509 or see the documentation of your boot loader (lilo or loadlin) about
510 how to pass options to the kernel at boot time.) The syntax of the
511 "lp" command line option can be found in <file:drivers/char/lp.c>.
513 If you have more than 8 printers, you need to increase the LP_NO
514 macro in lp.c and the PARPORT_MAX macro in parport.h.
517 bool "Support for console on line printer"
520 If you want kernel messages to be printed out as they occur, you
521 can have a console on the printer. This option adds support for
522 doing that; to actually get it to happen you need to pass the
523 option "console=lp0" to the kernel at boot time.
525 If the printer is out of paper (or off, or unplugged, or too
526 busy..) the kernel will stall until the printer is ready again.
527 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
528 can make the kernel continue when this happens,
529 but it'll lose the kernel messages.
534 tristate "Support for user-space parallel port device drivers"
537 Saying Y to this adds support for /dev/parport device nodes. This
538 is needed for programs that want portable access to the parallel
539 port, for instance deviceid (which displays Plug-and-Play device
542 This is the parallel port equivalent of SCSI generic support (sg).
543 It is safe to say N to this -- it is not needed for normal printing
544 or parallel port CD-ROM/disk support.
546 To compile this driver as a module, choose M here: the
547 module will be called ppdev.
552 tristate "Texas Instruments parallel link cable support"
555 If you own a Texas Instruments graphing calculator and use a
556 parallel link cable, then you might be interested in this driver.
558 If you enable this driver, you will be able to communicate with
559 your calculator through a set of device nodes under /dev. The
560 main advantage of this driver is that you don't have to be root
561 to use this precise link cable (depending on the permissions on
562 the device nodes, though).
564 To compile this driver as a module, choose M here: the
565 module will be called tipar.
567 If you don't know what a parallel link cable is or what a Texas
568 Instruments graphing calculator is, then you probably don't need this
574 bool "pSeries Hypervisor Virtual Console support"
575 depends on PPC_PSERIES
577 pSeries machines when partitioned support a hypervisor virtual
578 console. This driver allows each pSeries partition to have a console
579 which is accessed via the HMC.
582 tristate "IBM Hypervisor Virtual Console Server support"
583 depends on PPC_PSERIES
585 Partitionable IBM Power5 ppc64 machines allow hosting of
586 firmware virtual consoles from one Linux partition by
587 another Linux partition. This driver allows console data
588 from Linux partitions to be accessed through TTY device
589 interfaces in the device tree of a Linux partition running
592 To compile this driver as a module, choose M here: the
593 module will be called hvcs.ko. Additionally, this module
594 will depend on arch specific APIs exported from hvcserver.ko
595 which will also be compiled when this driver is built as a
598 source "drivers/char/ipmi/Kconfig"
600 source "drivers/char/watchdog/Kconfig"
603 tristate "NetWinder thermometer support"
604 depends on ARCH_NETWINDER
606 Say Y here to include support for the thermal management hardware
607 found in the NetWinder. This driver allows the user to control the
608 temperature set points and to read the current temperature.
610 It is also possible to say M here to build it as a module (ds1620)
611 It is recommended to be used on a NetWinder, but it is not a
615 tristate "NetWinder Button"
616 depends on ARCH_NETWINDER
618 If you say Y here and create a character device node /dev/nwbutton
619 with major and minor numbers 10 and 158 ("man mknod"), then every
620 time the orange button is pressed a number of times, the number of
621 times the button was pressed will be written to that device.
623 This is most useful for applications, as yet unwritten, which
624 perform actions based on how many times the button is pressed in a
627 Do not hold the button down for too long, as the driver does not
628 alter the behaviour of the hardware reset circuitry attached to the
629 button; it will still execute a hard reset if the button is held
630 down for longer than approximately five seconds.
632 To compile this driver as a module, choose M here: the
633 module will be called nwbutton.
635 Most people will answer Y to this question and "Reboot Using Button"
636 below to be able to initiate a system shutdown from the button.
638 config NWBUTTON_REBOOT
639 bool "Reboot Using Button"
642 If you say Y here, then you will be able to initiate a system
643 shutdown and reboot by pressing the orange button a number of times.
644 The number of presses to initiate the shutdown is two by default,
645 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
646 in nwbutton.h and recompiling the driver or, if you compile the
647 driver as a module, you can specify the number of presses at load
648 time with "insmod button reboot_count=<something>".
651 tristate "NetWinder flash support"
652 depends on ARCH_NETWINDER
654 If you say Y here and create a character device /dev/flash with
655 major 10 and minor 160 you can manipulate the flash ROM containing
656 the NetWinder firmware. Be careful as accidentally overwriting the
657 flash contents can render your computer unbootable. On no account
658 allow random users access to this device. :-)
660 To compile this driver as a module, choose M here: the
661 module will be called nwflash.
663 If you're not sure, say N.
666 tristate "Intel/AMD/VIA HW Random Number Generator support"
667 depends on (X86 || IA64) && PCI
669 This driver provides kernel-side support for the Random Number
670 Generator hardware found on Intel i8xx-based motherboards,
671 AMD 76x-based motherboards, and Via Nehemiah CPUs.
673 Provides a character driver, used to read() entropy data.
675 To compile this driver as a module, choose M here: the
676 module will be called hw_random.
681 tristate "/dev/nvram support"
682 depends on ATARI || X86 || X86_64 || ARM || GENERIC_NVRAM
684 If you say Y here and create a character special file /dev/nvram
685 with major number 10 and minor number 144 using mknod ("man mknod"),
686 you get read and write access to the extra bytes of non-volatile
687 memory in the real time clock (RTC), which is contained in every PC
688 and most Ataris. The actual number of bytes varies, depending on the
689 nvram in the system, but is usually 114 (128-14 for the RTC).
691 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
692 on Ataris. /dev/nvram may be used to view settings there, or to
693 change them (with some utility). It could also be used to frequently
694 save a few bits of very important data that may not be lost over
695 power-off and for which writing to disk is too insecure. Note
696 however that most NVRAM space in a PC belongs to the BIOS and you
697 should NEVER idly tamper with it. See Ralf Brown's interrupt list
698 for a guide to the use of CMOS bytes by your BIOS.
700 On Atari machines, /dev/nvram is always configured and does not need
703 To compile this driver as a module, choose M here: the
704 module will be called nvram.
707 tristate "Enhanced Real Time Clock Support"
708 depends on !PPC32 && !PARISC && !IA64 && !M68K
710 If you say Y here and create a character special file /dev/rtc with
711 major number 10 and minor number 135 using mknod ("man mknod"), you
712 will get access to the real time clock (or hardware clock) built
715 Every PC has such a clock built in. It can be used to generate
716 signals from as low as 1Hz up to 8192Hz, and can also be used
717 as a 24 hour alarm. It reports status information via the file
718 /proc/driver/rtc and its behaviour is set by various ioctls on
721 If you run Linux on a multiprocessor machine and said Y to
722 "Symmetric Multi Processing" above, you should say Y here to read
723 and set the RTC in an SMP compatible fashion.
725 If you think you have a use for such a device (such as periodic data
726 sampling), then say Y here, and read <file:Documentation/rtc.txt>
729 To compile this driver as a module, choose M here: the
730 module will be called rtc.
733 tristate "SGI DS1286 RTC support"
736 If you say Y here and create a character special file /dev/rtc with
737 major number 10 and minor number 135 using mknod ("man mknod"), you
738 will get access to the real time clock built into your computer.
739 Every SGI has such a clock built in. It reports status information
740 via the file /proc/rtc and its behaviour is set by various ioctls on
744 bool "SGI M48T35 RTC support"
747 If you say Y here and create a character special file /dev/rtc with
748 major number 10 and minor number 135 using mknod ("man mknod"), you
749 will get access to the real time clock built into your computer.
750 Every SGI has such a clock built in. It reports status information
751 via the file /proc/rtc and its behaviour is set by various ioctls on
755 tristate "Generic /dev/rtc emulation"
756 depends on RTC!=y && !IA64 && !ARM
758 If you say Y here and create a character special file /dev/rtc with
759 major number 10 and minor number 135 using mknod ("man mknod"), you
760 will get access to the real time clock (or hardware clock) built
763 It reports status information via the file /proc/driver/rtc and its
764 behaviour is set by various ioctls on /dev/rtc. If you enable the
765 "extended RTC operation" below it will also provide an emulation
766 for RTC_UIE which is required by some programs and may improve
767 precision in some cases.
769 To compile this driver as a module, choose M here: the
770 module will be called genrtc.
773 bool "Extended RTC operation"
776 Provides an emulation for RTC_UIE which is required by some programs
777 and may improve precision of the generic RTC support in some cases.
780 bool "EFI Real Time Clock Services"
784 bool "Support for Cobalt LCD"
785 depends on MIPS_COBALT
787 This option enables support for the LCD display and buttons found
788 on Cobalt systems through a misc device.
791 tristate "Double Talk PC internal speech card support"
793 This driver is for the DoubleTalk PC, a speech synthesizer
794 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
795 called the `internal DoubleTalk'.
797 To compile this driver as a module, choose M here: the
798 module will be called dtlk.
801 tristate "Siemens R3964 line discipline"
803 This driver allows synchronous communication with devices using the
804 Siemens R3964 packet protocol. Unless you are dealing with special
805 hardware like PLCs, you are unlikely to need this.
807 To compile this driver as a module, choose M here: the
808 module will be called n_r3964.
813 tristate "Applicom intelligent fieldbus card support"
816 This driver provides the kernel-side support for the intelligent
817 fieldbus cards made by Applicom International. More information
818 about these cards can be found on the WWW at the address
819 <http://www.applicom-int.com/>, or by email from David Woodhouse
820 <dwmw2@infradead.org>.
822 To compile this driver as a module, choose M here: the
823 module will be called applicom.
828 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
829 depends on EXPERIMENTAL && X86 && PCI && !64BIT
831 This driver enables access to the Sony Programmable I/O Control
832 Device which can be found in many (all ?) Sony Vaio laptops.
834 If you have one of those laptops, read
835 <file:Documentation/sonypi.txt>, and say Y or M here.
837 To compile this driver as a module, choose M here: the
838 module will be called sonypi.
841 menu "Ftape, the floppy tape device driver"
844 tristate "Ftape (QIC-80/Travan) support"
845 depends on BROKEN_ON_SMP && (ALPHA || X86)
847 If you have a tape drive that is connected to your floppy
848 controller, say Y here.
850 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
851 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
852 controller of their own. These drives (and their companion
853 controllers) are also supported if you say Y here.
855 If you have a special controller (such as the CMS FC-10, FC-20,
856 Mountain Mach-II, or any controller that is based on the Intel 82078
857 FDC like the high speed controllers by Seagate and Exabyte and
858 Iomega's "Ditto Dash") you must configure it by selecting the
859 appropriate entries from the "Floppy tape controllers" sub-menu
860 below and possibly modify the default values for the IRQ and DMA
861 channel and the IO base in ftape's configuration menu.
863 If you want to use your floppy tape drive on a PCI-bus based system,
864 please read the file <file:drivers/char/ftape/README.PCI>.
866 The ftape kernel driver is also available as a runtime loadable
867 module. To compile this driver as a module, choose M here: the
868 module will be called ftape.
870 Note that the Ftape-HOWTO is out of date (sorry) and documents the
871 older version 2.08 of this software but still contains useful
872 information. There is a web page with more recent documentation at
873 <http://www.instmath.rwth-aachen.de/~heine/ftape/>. This page
874 always contains the latest release of the ftape driver and useful
875 information (backup software, ftape related patches and
876 documentation, FAQ). Note that the file system interface has
877 changed quite a bit compared to previous versions of ftape. Please
878 read <file:Documentation/ftape.txt>.
880 source "drivers/char/ftape/Kconfig"
884 source "drivers/char/agp/Kconfig"
886 source "drivers/char/drm/Kconfig"
888 source "drivers/char/pcmcia/Kconfig"
891 tristate "ACP Modem (Mwave) support"
895 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
896 kernel driver and a user level application. Together these components
897 support direct attachment to public switched telephone networks (PSTNs)
898 and support selected world wide countries.
900 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
901 600, and 770 that include on board ACP modem hardware.
903 The modem also supports the standard communications port interface
904 (ttySx) and is compatible with the Hayes AT Command Set.
906 The user level application needed to use this driver can be found at
907 the IBM Linux Technology Center (LTC) web site:
908 <http://www.ibm.com/linux/ltc/>.
910 If you own one of the above IBM Thinkpads which has the Mwave chipset
913 To compile this driver as a module, choose M here: the
914 module will be called mwave.
917 tristate "NatSemi SCx200 GPIO Support"
920 Give userspace access to the GPIO pins on the National
921 Semiconductor SCx200 processors.
923 If compiled as a module, it will be called scx200_gpio.
926 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
928 The raw driver permits block devices to be bound to /dev/raw/rawN.
929 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
930 See the raw(8) manpage for more details.
932 The raw driver is deprecated and may be removed from 2.7
933 kernels. Applications should simply open the device (eg /dev/hda1)
934 with the O_DIRECT flag.
937 bool "HPET - High Precision Event Timer" if (X86 || IA64)
941 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
942 open selects one of the timers supported by the HPET. The timers are
943 non-periodioc and/or periodic.
946 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
950 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
951 is assumed the platform called hpet_alloc with the RTC IRQ values for
955 bool "Allow mmap of HPET"
959 If you say Y here, user applications will be able to mmap
962 In some hardware implementations, the page containing HPET
963 registers may also contain other things that shouldn't be
964 exposed to the user. If this applies to your hardware,
968 int "Maximum number of RAW devices to support (1-8192)"
969 depends on RAW_DRIVER
972 The maximum number of RAW devices that are supported.
973 Default is 256. Increase this number in case you need lots of
976 config HANGCHECK_TIMER
977 tristate "Hangcheck timer"
978 depends on X86_64 || X86
980 The hangcheck-timer module detects when the system has gone
981 out to lunch past a certain margin. It can reboot the system
982 or merely print a warning.
985 tristate "MMTIMER Memory mapped RTC for SGI Altix"
986 depends on IA64_GENERIC || IA64_SGI_SN2
989 The mmtimer device allows direct userspace access to the