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
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
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 "Enable Au1000 UART Support"
353 depends on SERIAL_NONSTANDARD && MIPS
355 If you have an Alchemy AU1000 processor (MIPS based) and you want
356 to use serial ports, say Y. Otherwise, say N.
358 config AU1000_SERIAL_CONSOLE
359 bool "Enable Au1000 serial console"
360 depends on AU1000_UART
362 If you have an Alchemy AU1000 processor (MIPS based) and you want
363 to use a console on a serial port, say Y. Otherwise, say N.
365 config QTRONIX_KEYBOARD
366 bool "Enable Qtronix 990P Keyboard Support"
369 Images of Qtronix keyboards are at
370 <http://www.qtronix.com/keyboard.html>.
374 depends on QTRONIX_KEYBOARD
378 bool "Enable Smart Card Reader 0 Support "
381 Say Y here to support smart-card reader 0 (SCR0) on the Integrated
382 Technology Express, Inc. ITE8172 SBC. Vendor page at
383 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
384 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
387 bool "Enable Smart Card Reader 1 Support "
390 Say Y here to support smart-card reader 1 (SCR1) on the Integrated
391 Technology Express, Inc. ITE8172 SBC. Vendor page at
392 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
393 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
396 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
397 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
399 This option supports the 2232 7-port serial card shipped with the
400 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
401 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
402 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
403 ports were connected with 8 pin DIN connectors on the card bracket,
404 for which 8 pin to DB25 adapters were supplied. The card also had
405 jumpers internally to toggle various pinning configurations.
407 This driver can be built as a module; but then "generic_serial"
408 will also be built as a module. This has to be loaded before
409 "ser_a2232". If you want to do this, answer M here.
412 bool "SGI Altix system controller communication support"
413 depends on (IA64_SGI_SN2 || IA64_GENERIC)
415 If you have an SGI Altix and you want to enable system
416 controller communication from user space (you want this!),
417 say Y. Otherwise, say N.
419 source "drivers/serial/Kconfig"
422 bool "Unix98 PTY support" if EMBEDDED
425 A pseudo terminal (PTY) is a software device consisting of two
426 halves: a master and a slave. The slave device behaves identical to
427 a physical terminal; the master device is used by a process to
428 read data from and write data to the slave, thereby emulating a
429 terminal. Typical programs for the master side are telnet servers
432 Linux has traditionally used the BSD-like names /dev/ptyxx for
433 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
434 has a number of problems. The GNU C library glibc 2.1 and later,
435 however, supports the Unix98 naming standard: in order to acquire a
436 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
437 terminal is then made available to the process and the pseudo
438 terminal slave can be accessed as /dev/pts/<number>. What was
439 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
441 All modern Linux systems use the Unix98 ptys. Say Y unless
442 you're on an embedded system and want to conserve memory.
445 bool "Legacy (BSD) PTY support"
448 A pseudo terminal (PTY) is a software device consisting of two
449 halves: a master and a slave. The slave device behaves identical to
450 a physical terminal; the master device is used by a process to
451 read data from and write data to the slave, thereby emulating a
452 terminal. Typical programs for the master side are telnet servers
455 Linux has traditionally used the BSD-like names /dev/ptyxx
456 for masters and /dev/ttyxx for slaves of pseudo
457 terminals. This scheme has a number of problems, including
458 security. This option enables these legacy devices; on most
459 systems, it is safe to say N.
462 config LEGACY_PTY_COUNT
463 int "Maximum number of legacy PTY in use"
464 depends on LEGACY_PTYS
468 The maximum number of legacy PTYs that can be used at any one time.
469 The default is 256, and should be more than enough. Embedded
470 systems may want to reduce this to save memory.
472 When not in use, each legacy PTY occupies 12 bytes on 32-bit
473 architectures and 24 bytes on 64-bit architectures.
476 tristate "Parallel printer support"
479 If you intend to attach a printer to the parallel port of your Linux
480 box (as opposed to using a serial printer; if the connector at the
481 printer has 9 or 25 holes ["female"], then it's serial), say Y.
482 Also read the Printing-HOWTO, available from
483 <http://www.tldp.org/docs.html#howto>.
485 It is possible to share one parallel port among several devices
486 (e.g. printer and ZIP drive) and it is safe to compile the
487 corresponding drivers into the kernel.
489 To compile this driver as a module, choose M here and read
490 <file:Documentation/parport.txt>. The module will be called lp.
492 If you have several parallel ports, you can specify which ports to
493 use with the "lp" kernel command line option. (Try "man bootparam"
494 or see the documentation of your boot loader (lilo or loadlin) about
495 how to pass options to the kernel at boot time.) The syntax of the
496 "lp" command line option can be found in <file:drivers/char/lp.c>.
498 If you have more than 8 printers, you need to increase the LP_NO
499 macro in lp.c and the PARPORT_MAX macro in parport.h.
502 bool "Support for console on line printer"
505 If you want kernel messages to be printed out as they occur, you
506 can have a console on the printer. This option adds support for
507 doing that; to actually get it to happen you need to pass the
508 option "console=lp0" to the kernel at boot time.
510 If the printer is out of paper (or off, or unplugged, or too
511 busy..) the kernel will stall until the printer is ready again.
512 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
513 can make the kernel continue when this happens,
514 but it'll lose the kernel messages.
519 tristate "Support for user-space parallel port device drivers"
522 Saying Y to this adds support for /dev/parport device nodes. This
523 is needed for programs that want portable access to the parallel
524 port, for instance deviceid (which displays Plug-and-Play device
527 This is the parallel port equivalent of SCSI generic support (sg).
528 It is safe to say N to this -- it is not needed for normal printing
529 or parallel port CD-ROM/disk support.
531 To compile this driver as a module, choose M here: the
532 module will be called ppdev.
537 tristate "Texas Instruments parallel link cable support"
540 If you own a Texas Instruments graphing calculator and use a
541 parallel link cable, then you might be interested in this driver.
543 If you enable this driver, you will be able to communicate with
544 your calculator through a set of device nodes under /dev. The
545 main advantage of this driver is that you don't have to be root
546 to use this precise link cable (depending on the permissions on
547 the device nodes, though).
549 To compile this driver as a module, choose M here: the
550 module will be called tipar.
552 If you don't know what a parallel link cable is or what a Texas
553 Instruments graphing calculator is, then you probably don't need this
559 bool "pSeries Hypervisor Virtual Console support"
560 depends on PPC_PSERIES
562 pSeries machines when partitioned support a hypervisor virtual
563 console. This driver allows each pSeries partition to have a console
564 which is accessed via the HMC.
567 tristate "IBM Hypervisor Virtual Console Server support"
568 depends on PPC_PSERIES
570 Partitionable IBM Power5 ppc64 machines allow hosting of
571 firmware virtual consoles from one Linux partition by
572 another Linux partition. This driver allows console data
573 from Linux partitions to be accessed through TTY device
574 interfaces in the device tree of a Linux partition running
577 To compile this driver as a module, choose M here: the
578 module will be called hvcs.ko. Additionally, this module
579 will depend on arch specific APIs exported from hvcserver.ko
580 which will also be compiled when this driver is built as a
583 source "drivers/char/ipmi/Kconfig"
585 source "drivers/char/watchdog/Kconfig"
588 tristate "NetWinder thermometer support"
589 depends on ARCH_NETWINDER
591 Say Y here to include support for the thermal management hardware
592 found in the NetWinder. This driver allows the user to control the
593 temperature set points and to read the current temperature.
595 It is also possible to say M here to build it as a module (ds1620)
596 It is recommended to be used on a NetWinder, but it is not a
600 tristate "NetWinder Button"
601 depends on ARCH_NETWINDER
603 If you say Y here and create a character device node /dev/nwbutton
604 with major and minor numbers 10 and 158 ("man mknod"), then every
605 time the orange button is pressed a number of times, the number of
606 times the button was pressed will be written to that device.
608 This is most useful for applications, as yet unwritten, which
609 perform actions based on how many times the button is pressed in a
612 Do not hold the button down for too long, as the driver does not
613 alter the behaviour of the hardware reset circuitry attached to the
614 button; it will still execute a hard reset if the button is held
615 down for longer than approximately five seconds.
617 To compile this driver as a module, choose M here: the
618 module will be called nwbutton.
620 Most people will answer Y to this question and "Reboot Using Button"
621 below to be able to initiate a system shutdown from the button.
623 config NWBUTTON_REBOOT
624 bool "Reboot Using Button"
627 If you say Y here, then you will be able to initiate a system
628 shutdown and reboot by pressing the orange button a number of times.
629 The number of presses to initiate the shutdown is two by default,
630 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
631 in nwbutton.h and recompiling the driver or, if you compile the
632 driver as a module, you can specify the number of presses at load
633 time with "insmod button reboot_count=<something>".
636 tristate "NetWinder flash support"
637 depends on ARCH_NETWINDER
639 If you say Y here and create a character device /dev/flash with
640 major 10 and minor 160 you can manipulate the flash ROM containing
641 the NetWinder firmware. Be careful as accidentally overwriting the
642 flash contents can render your computer unbootable. On no account
643 allow random users access to this device. :-)
645 To compile this driver as a module, choose M here: the
646 module will be called nwflash.
648 If you're not sure, say N.
651 tristate "Intel/AMD/VIA HW Random Number Generator support"
652 depends on (X86 || IA64) && PCI
654 This driver provides kernel-side support for the Random Number
655 Generator hardware found on Intel i8xx-based motherboards,
656 AMD 76x-based motherboards, and Via Nehemiah CPUs.
658 Provides a character driver, used to read() entropy data.
660 To compile this driver as a module, choose M here: the
661 module will be called hw_random.
666 tristate "/dev/nvram support"
667 depends on ATARI || X86 || X86_64 || ARM || GENERIC_NVRAM
669 If you say Y here and create a character special file /dev/nvram
670 with major number 10 and minor number 144 using mknod ("man mknod"),
671 you get read and write access to the extra bytes of non-volatile
672 memory in the real time clock (RTC), which is contained in every PC
673 and most Ataris. The actual number of bytes varies, depending on the
674 nvram in the system, but is usually 114 (128-14 for the RTC).
676 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
677 on Ataris. /dev/nvram may be used to view settings there, or to
678 change them (with some utility). It could also be used to frequently
679 save a few bits of very important data that may not be lost over
680 power-off and for which writing to disk is too insecure. Note
681 however that most NVRAM space in a PC belongs to the BIOS and you
682 should NEVER idly tamper with it. See Ralf Brown's interrupt list
683 for a guide to the use of CMOS bytes by your BIOS.
685 On Atari machines, /dev/nvram is always configured and does not need
688 To compile this driver as a module, choose M here: the
689 module will be called nvram.
692 tristate "Enhanced Real Time Clock Support"
693 depends on !PPC32 && !PARISC && !IA64 && !M68K
695 If you say Y here and create a character special file /dev/rtc with
696 major number 10 and minor number 135 using mknod ("man mknod"), you
697 will get access to the real time clock (or hardware clock) built
700 Every PC has such a clock built in. It can be used to generate
701 signals from as low as 1Hz up to 8192Hz, and can also be used
702 as a 24 hour alarm. It reports status information via the file
703 /proc/driver/rtc and its behaviour is set by various ioctls on
706 If you run Linux on a multiprocessor machine and said Y to
707 "Symmetric Multi Processing" above, you should say Y here to read
708 and set the RTC in an SMP compatible fashion.
710 If you think you have a use for such a device (such as periodic data
711 sampling), then say Y here, and read <file:Documentation/rtc.txt>
714 To compile this driver as a module, choose M here: the
715 module will be called rtc.
718 tristate "SGI DS1286 RTC support"
721 If you say Y here and create a character special file /dev/rtc with
722 major number 10 and minor number 135 using mknod ("man mknod"), you
723 will get access to the real time clock built into your computer.
724 Every SGI has such a clock built in. It reports status information
725 via the file /proc/rtc and its behaviour is set by various ioctls on
729 bool "SGI M48T35 RTC support"
732 If you say Y here and create a character special file /dev/rtc with
733 major number 10 and minor number 135 using mknod ("man mknod"), you
734 will get access to the real time clock built into your computer.
735 Every SGI has such a clock built in. It reports status information
736 via the file /proc/rtc and its behaviour is set by various ioctls on
740 tristate "Generic /dev/rtc emulation"
741 depends on RTC!=y && !IA64 && !ARM
743 If you say Y here and create a character special file /dev/rtc with
744 major number 10 and minor number 135 using mknod ("man mknod"), you
745 will get access to the real time clock (or hardware clock) built
748 It reports status information via the file /proc/driver/rtc and its
749 behaviour is set by various ioctls on /dev/rtc. If you enable the
750 "extended RTC operation" below it will also provide an emulation
751 for RTC_UIE which is required by some programs and may improve
752 precision in some cases.
754 To compile this driver as a module, choose M here: the
755 module will be called genrtc.
758 bool "Extended RTC operation"
761 Provides an emulation for RTC_UIE which is required by some programs
762 and may improve precision of the generic RTC support in some cases.
765 bool "EFI Real Time Clock Services"
769 tristate "DS1302 RTC support"
770 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
772 If you say Y here and create a character special file /dev/rtc with
773 major number 121 and minor number 0 using mknod ("man mknod"), you
774 will get access to the real time clock (or hardware clock) built
778 bool "S3C2410 RTC Driver"
779 depends on ARCH_S3C2410
781 RTC (Realtime Clock) driver for the clock inbuilt into the
782 Samsung S3C2410. This can provide periodic interrupt rates
783 from 1Hz to 64Hz for user programs, and wakeup from Alarm.
786 bool "Support for Cobalt LCD"
787 depends on MIPS_COBALT
789 This option enables support for the LCD display and buttons found
790 on Cobalt systems through a misc device.
793 tristate "Double Talk PC internal speech card support"
795 This driver is for the DoubleTalk PC, a speech synthesizer
796 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
797 called the `internal DoubleTalk'.
799 To compile this driver as a module, choose M here: the
800 module will be called dtlk.
803 tristate "Siemens R3964 line discipline"
805 This driver allows synchronous communication with devices using the
806 Siemens R3964 packet protocol. Unless you are dealing with special
807 hardware like PLCs, you are unlikely to need this.
809 To compile this driver as a module, choose M here: the
810 module will be called n_r3964.
815 tristate "Applicom intelligent fieldbus card support"
818 This driver provides the kernel-side support for the intelligent
819 fieldbus cards made by Applicom International. More information
820 about these cards can be found on the WWW at the address
821 <http://www.applicom-int.com/>, or by email from David Woodhouse
822 <dwmw2@infradead.org>.
824 To compile this driver as a module, choose M here: the
825 module will be called applicom.
830 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
831 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
833 This driver enables access to the Sony Programmable I/O Control
834 Device which can be found in many (all ?) Sony Vaio laptops.
836 If you have one of those laptops, read
837 <file:Documentation/sonypi.txt>, and say Y or M here.
839 To compile this driver as a module, choose M here: the
840 module will be called sonypi.
843 menu "Ftape, the floppy tape device driver"
846 tristate "Ftape (QIC-80/Travan) support"
847 depends on BROKEN_ON_SMP && (ALPHA || X86)
849 If you have a tape drive that is connected to your floppy
850 controller, say Y here.
852 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
853 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
854 controller of their own. These drives (and their companion
855 controllers) are also supported if you say Y here.
857 If you have a special controller (such as the CMS FC-10, FC-20,
858 Mountain Mach-II, or any controller that is based on the Intel 82078
859 FDC like the high speed controllers by Seagate and Exabyte and
860 Iomega's "Ditto Dash") you must configure it by selecting the
861 appropriate entries from the "Floppy tape controllers" sub-menu
862 below and possibly modify the default values for the IRQ and DMA
863 channel and the IO base in ftape's configuration menu.
865 If you want to use your floppy tape drive on a PCI-bus based system,
866 please read the file <file:drivers/char/ftape/README.PCI>.
868 The ftape kernel driver is also available as a runtime loadable
869 module. To compile this driver as a module, choose M here: the
870 module will be called ftape.
872 Note that the Ftape-HOWTO is out of date (sorry) and documents the
873 older version 2.08 of this software but still contains useful
874 information. There is a web page with more recent documentation at
875 <http://www.instmath.rwth-aachen.de/~heine/ftape/>. This page
876 always contains the latest release of the ftape driver and useful
877 information (backup software, ftape related patches and
878 documentation, FAQ). Note that the file system interface has
879 changed quite a bit compared to previous versions of ftape. Please
880 read <file:Documentation/ftape.txt>.
882 source "drivers/char/ftape/Kconfig"
886 source "drivers/char/agp/Kconfig"
888 source "drivers/char/drm/Kconfig"
890 source "drivers/char/pcmcia/Kconfig"
893 tristate "ACP Modem (Mwave) support"
897 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
898 kernel driver and a user level application. Together these components
899 support direct attachment to public switched telephone networks (PSTNs)
900 and support selected world wide countries.
902 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
903 600, and 770 that include on board ACP modem hardware.
905 The modem also supports the standard communications port interface
906 (ttySx) and is compatible with the Hayes AT Command Set.
908 The user level application needed to use this driver can be found at
909 the IBM Linux Technology Center (LTC) web site:
910 <http://www.ibm.com/linux/ltc/>.
912 If you own one of the above IBM Thinkpads which has the Mwave chipset
915 To compile this driver as a module, choose M here: the
916 module will be called mwave.
919 tristate "NatSemi SCx200 GPIO Support"
922 Give userspace access to the GPIO pins on the National
923 Semiconductor SCx200 processors.
925 If compiled as a module, it will be called scx200_gpio.
928 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
930 The raw driver permits block devices to be bound to /dev/raw/rawN.
931 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
932 See the raw(8) manpage for more details.
934 The raw driver is deprecated and may be removed from 2.7
935 kernels. Applications should simply open the device (eg /dev/hda1)
936 with the O_DIRECT flag.
939 bool "HPET - High Precision Event Timer" if (X86 || IA64)
943 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
944 open selects one of the timers supported by the HPET. The timers are
945 non-periodioc and/or periodic.
948 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
952 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
953 is assumed the platform called hpet_alloc with the RTC IRQ values for
957 bool "Allow mmap of HPET"
961 If you say Y here, user applications will be able to mmap
964 In some hardware implementations, the page containing HPET
965 registers may also contain other things that shouldn't be
966 exposed to the user. If this applies to your hardware,
970 int "Maximum number of RAW devices to support (1-8192)"
971 depends on RAW_DRIVER
974 The maximum number of RAW devices that are supported.
975 Default is 256. Increase this number in case you need lots of
978 config HANGCHECK_TIMER
979 tristate "Hangcheck timer"
980 depends on X86_64 || X86
982 The hangcheck-timer module detects when the system has gone
983 out to lunch past a certain margin. It can reboot the system
984 or merely print a warning.
987 tristate "MMTIMER Memory mapped RTC for SGI Altix"
988 depends on IA64_GENERIC || IA64_SGI_SN2
991 The mmtimer device allows direct userspace access to the