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 && !UML
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 To compile this driver as a module, choose M here: the
152 module will be called epca.
155 tristate "Hayes ESP serial port support"
156 depends on SERIAL_NONSTANDARD && ISA && BROKEN_ON_SMP && ISA_DMA_API
158 This is a driver which supports Hayes ESP serial ports. Both single
159 port cards and multiport cards are supported. Make sure to read
160 <file:Documentation/hayes-esp.txt>.
162 To compile this driver as a module, choose M here: the
163 module will be called esp.
168 tristate "Moxa Intellio support"
169 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
171 Say Y here if you have a Moxa Intellio multiport serial card.
173 To compile this driver as a module, choose M here: the
174 module will be called moxa.
177 tristate "Moxa SmartIO support"
178 depends on SERIAL_NONSTANDARD
180 Say Y here if you have a Moxa SmartIO multiport serial card.
182 This driver can also be built as a module ( = code which can be
183 inserted in and removed from the running kernel whenever you want).
184 The module will be called mxser. If you want to do that, say M
188 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
189 depends on SERIAL_NONSTANDARD
191 This is a driver for the Multi-Tech cards which provide several
192 serial ports. The driver is experimental and can currently only be
193 built as a module. The module will be called isicom.
194 If you want to do that, choose M here.
197 tristate "Microgate SyncLink card support"
198 depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
200 Provides support for the SyncLink ISA and PCI multiprotocol serial
201 adapters. These adapters support asynchronous and HDLC bit
202 synchronous communication up to 10Mbps (PCI adapter).
204 This driver can only be built as a module ( = code which can be
205 inserted in and removed from the running kernel whenever you want).
206 The module will be called synclink. If you want to do that, say M
210 tristate "SyncLink Multiport support"
211 depends on SERIAL_NONSTANDARD
213 Enable support for the SyncLink Multiport (2 or 4 ports)
214 serial adapter, running asynchronous and HDLC communications up
215 to 2.048Mbps. Each ports is independently selectable for
216 RS-232, V.35, RS-449, RS-530, and X.21
218 This driver may be built as a module ( = code which can be
219 inserted in and removed from the running kernel whenever you want).
220 The module will be called synclinkmp. If you want to do that, say M
224 tristate "HDLC line discipline support"
225 depends on SERIAL_NONSTANDARD
227 Allows synchronous HDLC communications with tty device drivers that
228 support synchronous HDLC such as the Microgate SyncLink adapter.
230 This driver can only be built as a module ( = code which can be
231 inserted in and removed from the running kernel whenever you want).
232 The module will be called n_hdlc. If you want to do that, say M
236 tristate "SDL RISCom/8 card support"
237 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
239 This is a driver for the SDL Communications RISCom/8 multiport card,
240 which gives you many serial ports. You would need something like
241 this to connect more than two modems to your Linux box, for instance
242 in order to become a dial-in server. If you have a card like that,
243 say Y here and read the file <file:Documentation/riscom8.txt>.
245 Also it's possible to say M here and compile this driver as kernel
246 loadable module; the module will be called riscom8.
249 tristate "Specialix IO8+ card support"
250 depends on SERIAL_NONSTANDARD
252 This is a driver for the Specialix IO8+ multiport card (both the
253 ISA and the PCI version) which gives you many serial ports. You
254 would need something like this to connect more than two modems to
255 your Linux box, for instance in order to become a dial-in server.
257 If you have a card like that, say Y here and read the file
258 <file:Documentation/specialix.txt>. Also it's possible to say M here
259 and compile this driver as kernel loadable module which will be
262 config SPECIALIX_RTSCTS
263 bool "Specialix DTR/RTS pin is RTS"
266 The Specialix IO8+ card can only support either RTS or DTR. If you
267 say N here, the driver will use the pin as "DTR" when the tty is in
268 software handshake mode. If you say Y here or hardware handshake is
269 on, it will always be RTS. Read the file
270 <file:Documentation/specialix.txt> for more information.
273 tristate "Specialix SX (and SI) card support"
274 depends on SERIAL_NONSTANDARD
276 This is a driver for the SX and SI multiport serial cards.
277 Please read the file <file:Documentation/sx.txt> for details.
279 This driver can only be built as a module ( = code which can be
280 inserted in and removed from the running kernel whenever you want).
281 The module will be called sx. If you want to do that, say M here.
284 tristate "Specialix RIO system support"
285 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
287 This is a driver for the Specialix RIO, a smart serial card which
288 drives an outboard box that can support up to 128 ports. Product
289 information is at <http://www.perle.com/support/documentation.html#multiport>.
290 There are both ISA and PCI versions.
293 bool "Support really old RIO/PCI cards"
296 Older RIO PCI cards need some initialization-time configuration to
297 determine the IRQ and some control addresses. If you have a RIO and
298 this doesn't seem to work, try setting this to Y.
301 bool "Stallion multiport serial support"
302 depends on SERIAL_NONSTANDARD
304 Stallion cards give you many serial ports. You would need something
305 like this to connect more than two modems to your Linux box, for
306 instance in order to become a dial-in server. If you say Y here,
307 you will be asked for your specific card model in the next
308 questions. Make sure to read <file:Documentation/stallion.txt> in
309 this case. If you have never heard about all this, it's safe to
313 tristate "Stallion EasyIO or EC8/32 support"
314 depends on STALDRV && BROKEN_ON_SMP
316 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
317 card, then this is for you; say Y. Make sure to read
318 <file:Documentation/stallion.txt>.
320 To compile this driver as a module, choose M here: the
321 module will be called stallion.
324 tristate "Stallion EC8/64, ONboard, Brumby support"
325 depends on STALDRV && BROKEN_ON_SMP
327 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
328 serial multiport card, say Y here. Make sure to read
329 <file:Documentation/stallion.txt>.
331 To compile this driver as a module, choose M here: the
332 module will be called istallion.
335 bool "Enable Au1000 UART Support"
336 depends on SERIAL_NONSTANDARD && MIPS
338 If you have an Alchemy AU1000 processor (MIPS based) and you want
339 to use serial ports, say Y. Otherwise, say N.
341 config AU1000_SERIAL_CONSOLE
342 bool "Enable Au1000 serial console"
343 depends on AU1000_UART
345 If you have an Alchemy AU1000 processor (MIPS based) and you want
346 to use a console on a serial port, say Y. Otherwise, say N.
348 config QTRONIX_KEYBOARD
349 bool "Enable Qtronix 990P Keyboard Support"
352 Images of Qtronix keyboards are at
353 <http://www.qtronix.com/keyboard.html>.
357 depends on QTRONIX_KEYBOARD
361 bool "Enable Smart Card Reader 0 Support "
364 Say Y here to support smart-card reader 0 (SCR0) on the Integrated
365 Technology Express, Inc. ITE8172 SBC. Vendor page at
366 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
367 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
370 bool "Enable Smart Card Reader 1 Support "
373 Say Y here to support smart-card reader 1 (SCR1) on the Integrated
374 Technology Express, Inc. ITE8172 SBC. Vendor page at
375 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
376 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
379 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
380 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
382 This option supports the 2232 7-port serial card shipped with the
383 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
384 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
385 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
386 ports were connected with 8 pin DIN connectors on the card bracket,
387 for which 8 pin to DB25 adapters were supplied. The card also had
388 jumpers internally to toggle various pinning configurations.
390 This driver can be built as a module; but then "generic_serial"
391 will also be built as a module. This has to be loaded before
392 "ser_a2232". If you want to do this, answer M here.
395 bool "SGI Altix system controller communication support"
396 depends on (IA64_SGI_SN2 || IA64_GENERIC)
398 If you have an SGI Altix and you want to enable system
399 controller communication from user space (you want this!),
400 say Y. Otherwise, say N.
403 bool "SGI TIO CX driver support"
404 depends on (IA64_SGI_SN2 || IA64_GENERIC)
406 If you have an SGI Altix and you have fpga devices attached
407 to your TIO, say Y here, otherwise say N.
410 tristate "SGI FPGA Core Services driver support"
411 depends on (IA64_SGI_SN2 || IA64_GENERIC)
413 If you have an SGI Altix with an attached SABrick
414 say Y or M here, otherwise say N.
416 source "drivers/serial/Kconfig"
419 bool "Unix98 PTY support" if EMBEDDED
422 A pseudo terminal (PTY) is a software device consisting of two
423 halves: a master and a slave. The slave device behaves identical to
424 a physical terminal; the master device is used by a process to
425 read data from and write data to the slave, thereby emulating a
426 terminal. Typical programs for the master side are telnet servers
429 Linux has traditionally used the BSD-like names /dev/ptyxx for
430 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
431 has a number of problems. The GNU C library glibc 2.1 and later,
432 however, supports the Unix98 naming standard: in order to acquire a
433 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
434 terminal is then made available to the process and the pseudo
435 terminal slave can be accessed as /dev/pts/<number>. What was
436 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
438 All modern Linux systems use the Unix98 ptys. Say Y unless
439 you're on an embedded system and want to conserve memory.
442 bool "Legacy (BSD) PTY support"
445 A pseudo terminal (PTY) is a software device consisting of two
446 halves: a master and a slave. The slave device behaves identical to
447 a physical terminal; the master device is used by a process to
448 read data from and write data to the slave, thereby emulating a
449 terminal. Typical programs for the master side are telnet servers
452 Linux has traditionally used the BSD-like names /dev/ptyxx
453 for masters and /dev/ttyxx for slaves of pseudo
454 terminals. This scheme has a number of problems, including
455 security. This option enables these legacy devices; on most
456 systems, it is safe to say N.
459 config LEGACY_PTY_COUNT
460 int "Maximum number of legacy PTY in use"
461 depends on LEGACY_PTYS
465 The maximum number of legacy PTYs that can be used at any one time.
466 The default is 256, and should be more than enough. Embedded
467 systems may want to reduce this to save memory.
469 When not in use, each legacy PTY occupies 12 bytes on 32-bit
470 architectures and 24 bytes on 64-bit architectures.
473 tristate "Parallel printer support"
476 If you intend to attach a printer to the parallel port of your Linux
477 box (as opposed to using a serial printer; if the connector at the
478 printer has 9 or 25 holes ["female"], then it's serial), say Y.
479 Also read the Printing-HOWTO, available from
480 <http://www.tldp.org/docs.html#howto>.
482 It is possible to share one parallel port among several devices
483 (e.g. printer and ZIP drive) and it is safe to compile the
484 corresponding drivers into the kernel.
486 To compile this driver as a module, choose M here and read
487 <file:Documentation/parport.txt>. The module will be called lp.
489 If you have several parallel ports, you can specify which ports to
490 use with the "lp" kernel command line option. (Try "man bootparam"
491 or see the documentation of your boot loader (lilo or loadlin) about
492 how to pass options to the kernel at boot time.) The syntax of the
493 "lp" command line option can be found in <file:drivers/char/lp.c>.
495 If you have more than 8 printers, you need to increase the LP_NO
496 macro in lp.c and the PARPORT_MAX macro in parport.h.
499 bool "Support for console on line printer"
502 If you want kernel messages to be printed out as they occur, you
503 can have a console on the printer. This option adds support for
504 doing that; to actually get it to happen you need to pass the
505 option "console=lp0" to the kernel at boot time.
507 If the printer is out of paper (or off, or unplugged, or too
508 busy..) the kernel will stall until the printer is ready again.
509 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
510 can make the kernel continue when this happens,
511 but it'll lose the kernel messages.
516 tristate "Support for user-space parallel port device drivers"
519 Saying Y to this adds support for /dev/parport device nodes. This
520 is needed for programs that want portable access to the parallel
521 port, for instance deviceid (which displays Plug-and-Play device
524 This is the parallel port equivalent of SCSI generic support (sg).
525 It is safe to say N to this -- it is not needed for normal printing
526 or parallel port CD-ROM/disk support.
528 To compile this driver as a module, choose M here: the
529 module will be called ppdev.
534 tristate "Texas Instruments parallel link cable support"
537 If you own a Texas Instruments graphing calculator and use a
538 parallel link cable, then you might be interested in this driver.
540 If you enable this driver, you will be able to communicate with
541 your calculator through a set of device nodes under /dev. The
542 main advantage of this driver is that you don't have to be root
543 to use this precise link cable (depending on the permissions on
544 the device nodes, though).
546 To compile this driver as a module, choose M here: the
547 module will be called tipar.
549 If you don't know what a parallel link cable is or what a Texas
550 Instruments graphing calculator is, then you probably don't need this
556 bool "pSeries Hypervisor Virtual Console support"
557 depends on PPC_PSERIES
559 pSeries machines when partitioned support a hypervisor virtual
560 console. This driver allows each pSeries partition to have a console
561 which is accessed via the HMC.
564 tristate "IBM Hypervisor Virtual Console Server support"
565 depends on PPC_PSERIES
567 Partitionable IBM Power5 ppc64 machines allow hosting of
568 firmware virtual consoles from one Linux partition by
569 another Linux partition. This driver allows console data
570 from Linux partitions to be accessed through TTY device
571 interfaces in the device tree of a Linux partition running
574 To compile this driver as a module, choose M here: the
575 module will be called hvcs.ko. Additionally, this module
576 will depend on arch specific APIs exported from hvcserver.ko
577 which will also be compiled when this driver is built as a
580 source "drivers/char/ipmi/Kconfig"
582 source "drivers/char/watchdog/Kconfig"
585 tristate "NetWinder thermometer support"
586 depends on ARCH_NETWINDER
588 Say Y here to include support for the thermal management hardware
589 found in the NetWinder. This driver allows the user to control the
590 temperature set points and to read the current temperature.
592 It is also possible to say M here to build it as a module (ds1620)
593 It is recommended to be used on a NetWinder, but it is not a
597 tristate "NetWinder Button"
598 depends on ARCH_NETWINDER
600 If you say Y here and create a character device node /dev/nwbutton
601 with major and minor numbers 10 and 158 ("man mknod"), then every
602 time the orange button is pressed a number of times, the number of
603 times the button was pressed will be written to that device.
605 This is most useful for applications, as yet unwritten, which
606 perform actions based on how many times the button is pressed in a
609 Do not hold the button down for too long, as the driver does not
610 alter the behaviour of the hardware reset circuitry attached to the
611 button; it will still execute a hard reset if the button is held
612 down for longer than approximately five seconds.
614 To compile this driver as a module, choose M here: the
615 module will be called nwbutton.
617 Most people will answer Y to this question and "Reboot Using Button"
618 below to be able to initiate a system shutdown from the button.
620 config NWBUTTON_REBOOT
621 bool "Reboot Using Button"
624 If you say Y here, then you will be able to initiate a system
625 shutdown and reboot by pressing the orange button a number of times.
626 The number of presses to initiate the shutdown is two by default,
627 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
628 in nwbutton.h and recompiling the driver or, if you compile the
629 driver as a module, you can specify the number of presses at load
630 time with "insmod button reboot_count=<something>".
633 tristate "NetWinder flash support"
634 depends on ARCH_NETWINDER
636 If you say Y here and create a character device /dev/flash with
637 major 10 and minor 160 you can manipulate the flash ROM containing
638 the NetWinder firmware. Be careful as accidentally overwriting the
639 flash contents can render your computer unbootable. On no account
640 allow random users access to this device. :-)
642 To compile this driver as a module, choose M here: the
643 module will be called nwflash.
645 If you're not sure, say N.
648 tristate "Intel/AMD/VIA HW Random Number Generator support"
649 depends on (X86 || IA64) && PCI
651 This driver provides kernel-side support for the Random Number
652 Generator hardware found on Intel i8xx-based motherboards,
653 AMD 76x-based motherboards, and Via Nehemiah CPUs.
655 Provides a character driver, used to read() entropy data.
657 To compile this driver as a module, choose M here: the
658 module will be called hw_random.
663 tristate "/dev/nvram support"
664 depends on ATARI || X86 || X86_64 || ARM || GENERIC_NVRAM
666 If you say Y here and create a character special file /dev/nvram
667 with major number 10 and minor number 144 using mknod ("man mknod"),
668 you get read and write access to the extra bytes of non-volatile
669 memory in the real time clock (RTC), which is contained in every PC
670 and most Ataris. The actual number of bytes varies, depending on the
671 nvram in the system, but is usually 114 (128-14 for the RTC).
673 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
674 on Ataris. /dev/nvram may be used to view settings there, or to
675 change them (with some utility). It could also be used to frequently
676 save a few bits of very important data that may not be lost over
677 power-off and for which writing to disk is too insecure. Note
678 however that most NVRAM space in a PC belongs to the BIOS and you
679 should NEVER idly tamper with it. See Ralf Brown's interrupt list
680 for a guide to the use of CMOS bytes by your BIOS.
682 On Atari machines, /dev/nvram is always configured and does not need
685 To compile this driver as a module, choose M here: the
686 module will be called nvram.
689 tristate "Enhanced Real Time Clock Support"
690 depends on !PPC32 && !PARISC && !IA64 && !M68K
692 If you say Y here and create a character special file /dev/rtc with
693 major number 10 and minor number 135 using mknod ("man mknod"), you
694 will get access to the real time clock (or hardware clock) built
697 Every PC has such a clock built in. It can be used to generate
698 signals from as low as 1Hz up to 8192Hz, and can also be used
699 as a 24 hour alarm. It reports status information via the file
700 /proc/driver/rtc and its behaviour is set by various ioctls on
703 If you run Linux on a multiprocessor machine and said Y to
704 "Symmetric Multi Processing" above, you should say Y here to read
705 and set the RTC in an SMP compatible fashion.
707 If you think you have a use for such a device (such as periodic data
708 sampling), then say Y here, and read <file:Documentation/rtc.txt>
711 To compile this driver as a module, choose M here: the
712 module will be called rtc.
715 tristate "SGI DS1286 RTC support"
718 If you say Y here and create a character special file /dev/rtc with
719 major number 10 and minor number 135 using mknod ("man mknod"), you
720 will get access to the real time clock built into your computer.
721 Every SGI has such a clock built in. It reports status information
722 via the file /proc/rtc and its behaviour is set by various ioctls on
726 bool "SGI M48T35 RTC support"
729 If you say Y here and create a character special file /dev/rtc with
730 major number 10 and minor number 135 using mknod ("man mknod"), you
731 will get access to the real time clock built into your computer.
732 Every SGI has such a clock built in. It reports status information
733 via the file /proc/rtc and its behaviour is set by various ioctls on
737 tristate "Generic /dev/rtc emulation"
738 depends on RTC!=y && !IA64 && !ARM
740 If you say Y here and create a character special file /dev/rtc with
741 major number 10 and minor number 135 using mknod ("man mknod"), you
742 will get access to the real time clock (or hardware clock) built
745 It reports status information via the file /proc/driver/rtc and its
746 behaviour is set by various ioctls on /dev/rtc. If you enable the
747 "extended RTC operation" below it will also provide an emulation
748 for RTC_UIE which is required by some programs and may improve
749 precision in some cases.
751 To compile this driver as a module, choose M here: the
752 module will be called genrtc.
755 bool "Extended RTC operation"
758 Provides an emulation for RTC_UIE which is required by some programs
759 and may improve precision of the generic RTC support in some cases.
762 bool "EFI Real Time Clock Services"
766 tristate "DS1302 RTC support"
767 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
769 If you say Y here and create a character special file /dev/rtc with
770 major number 121 and minor number 0 using mknod ("man mknod"), you
771 will get access to the real time clock (or hardware clock) built
775 bool "S3C2410 RTC Driver"
776 depends on ARCH_S3C2410
778 RTC (Realtime Clock) driver for the clock inbuilt into the
779 Samsung S3C2410. This can provide periodic interrupt rates
780 from 1Hz to 64Hz for user programs, and wakeup from Alarm.
783 tristate "NEC VR4100 series Real Time Clock Support"
784 depends on CPU_VR41XX
787 bool "Support for Cobalt LCD"
788 depends on MIPS_COBALT
790 This option enables support for the LCD display and buttons found
791 on Cobalt systems through a misc device.
794 tristate "Double Talk PC internal speech card support"
796 This driver is for the DoubleTalk PC, a speech synthesizer
797 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
798 called the `internal DoubleTalk'.
800 To compile this driver as a module, choose M here: the
801 module will be called dtlk.
804 tristate "Siemens R3964 line discipline"
806 This driver allows synchronous communication with devices using the
807 Siemens R3964 packet protocol. Unless you are dealing with special
808 hardware like PLCs, you are unlikely to need this.
810 To compile this driver as a module, choose M here: the
811 module will be called n_r3964.
816 tristate "Applicom intelligent fieldbus card support"
819 This driver provides the kernel-side support for the intelligent
820 fieldbus cards made by Applicom International. More information
821 about these cards can be found on the WWW at the address
822 <http://www.applicom-int.com/>, or by email from David Woodhouse
823 <dwmw2@infradead.org>.
825 To compile this driver as a module, choose M here: the
826 module will be called applicom.
831 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
832 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
834 This driver enables access to the Sony Programmable I/O Control
835 Device which can be found in many (all ?) Sony Vaio laptops.
837 If you have one of those laptops, read
838 <file:Documentation/sonypi.txt>, and say Y or M here.
840 To compile this driver as a module, choose M here: the
841 module will be called sonypi.
844 tristate "TANBAC TB0219 base board support"
845 depends TANBAC_TB0229
848 menu "Ftape, the floppy tape device driver"
851 tristate "Ftape (QIC-80/Travan) support"
852 depends on BROKEN_ON_SMP && (ALPHA || X86)
854 If you have a tape drive that is connected to your floppy
855 controller, say Y here.
857 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
858 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
859 controller of their own. These drives (and their companion
860 controllers) are also supported if you say Y here.
862 If you have a special controller (such as the CMS FC-10, FC-20,
863 Mountain Mach-II, or any controller that is based on the Intel 82078
864 FDC like the high speed controllers by Seagate and Exabyte and
865 Iomega's "Ditto Dash") you must configure it by selecting the
866 appropriate entries from the "Floppy tape controllers" sub-menu
867 below and possibly modify the default values for the IRQ and DMA
868 channel and the IO base in ftape's configuration menu.
870 If you want to use your floppy tape drive on a PCI-bus based system,
871 please read the file <file:drivers/char/ftape/README.PCI>.
873 The ftape kernel driver is also available as a runtime loadable
874 module. To compile this driver as a module, choose M here: the
875 module will be called ftape.
877 Note that the Ftape-HOWTO is out of date (sorry) and documents the
878 older version 2.08 of this software but still contains useful
879 information. There is a web page with more recent documentation at
880 <http://www.instmath.rwth-aachen.de/~heine/ftape/>. This page
881 always contains the latest release of the ftape driver and useful
882 information (backup software, ftape related patches and
883 documentation, FAQ). Note that the file system interface has
884 changed quite a bit compared to previous versions of ftape. Please
885 read <file:Documentation/ftape.txt>.
887 source "drivers/char/ftape/Kconfig"
891 source "drivers/char/agp/Kconfig"
893 source "drivers/char/drm/Kconfig"
895 source "drivers/char/pcmcia/Kconfig"
898 tristate "ACP Modem (Mwave) support"
902 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
903 kernel driver and a user level application. Together these components
904 support direct attachment to public switched telephone networks (PSTNs)
905 and support selected world wide countries.
907 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
908 600, and 770 that include on board ACP modem hardware.
910 The modem also supports the standard communications port interface
911 (ttySx) and is compatible with the Hayes AT Command Set.
913 The user level application needed to use this driver can be found at
914 the IBM Linux Technology Center (LTC) web site:
915 <http://www.ibm.com/linux/ltc/>.
917 If you own one of the above IBM Thinkpads which has the Mwave chipset
920 To compile this driver as a module, choose M here: the
921 module will be called mwave.
924 tristate "NatSemi SCx200 GPIO Support"
927 Give userspace access to the GPIO pins on the National
928 Semiconductor SCx200 processors.
930 If compiled as a module, it will be called scx200_gpio.
933 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
935 The raw driver permits block devices to be bound to /dev/raw/rawN.
936 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
937 See the raw(8) manpage for more details.
939 The raw driver is deprecated and may be removed from 2.7
940 kernels. Applications should simply open the device (eg /dev/hda1)
941 with the O_DIRECT flag.
944 bool "HPET - High Precision Event Timer" if (X86 || IA64)
948 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
949 open selects one of the timers supported by the HPET. The timers are
950 non-periodioc and/or periodic.
953 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
957 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
958 is assumed the platform called hpet_alloc with the RTC IRQ values for
962 bool "Allow mmap of HPET"
966 If you say Y here, user applications will be able to mmap
969 In some hardware implementations, the page containing HPET
970 registers may also contain other things that shouldn't be
971 exposed to the user. If this applies to your hardware,
975 int "Maximum number of RAW devices to support (1-8192)"
976 depends on RAW_DRIVER
979 The maximum number of RAW devices that are supported.
980 Default is 256. Increase this number in case you need lots of
983 config HANGCHECK_TIMER
984 tristate "Hangcheck timer"
985 depends on X86_64 || X86 || IA64 || PPC64 || ARCH_S390
987 The hangcheck-timer module detects when the system has gone
988 out to lunch past a certain margin. It can reboot the system
989 or merely print a warning.
992 tristate "MMTIMER Memory mapped RTC for SGI Altix"
993 depends on IA64_GENERIC || IA64_SGI_SN2
996 The mmtimer device allows direct userspace access to the
999 source "drivers/char/tpm/Kconfig"
projects / linux-2.6 / blob