2 # Character device configuration
5 menu "Character devices"
8 bool "Virtual terminal" if EMBEDDED
13 If you say Y here, you will get support for terminal devices with
14 display and keyboard devices. These are called "virtual" because you
15 can run several virtual terminals (also called virtual consoles) on
16 one physical terminal. This is rather useful, for example one
17 virtual terminal can collect system messages and warnings, another
18 one can be used for a text-mode user session, and a third could run
19 an X session, all in parallel. Switching between virtual terminals
20 is done with certain key combinations, usually Alt-<function key>.
22 The setterm command ("man setterm") can be used to change the
23 properties (such as colors or beeping) of a virtual terminal. The
24 man page console_codes(4) ("man console_codes") contains the special
25 character sequences that can be used to change those properties
26 directly. The fonts used on virtual terminals can be changed with
27 the setfont ("man setfont") command and the key bindings are defined
28 with the loadkeys ("man loadkeys") command.
30 You need at least one virtual terminal device in order to make use
31 of your keyboard and monitor. Therefore, only people configuring an
32 embedded system would want to say N here in order to save some
33 memory; the only way to log into such a system is then via a serial
34 or network connection.
36 If unsure, say Y, or else you won't be able to do much with your new
37 shiny Linux system :-)
40 bool "Support for console on virtual terminal" if EMBEDDED
44 The system console is the device which receives all kernel messages
45 and warnings and which allows logins in single user mode. If you
46 answer Y here, a virtual terminal (the device used to interact with
47 a physical terminal) can be used as system console. This is the most
48 common mode of operations, so you should say Y here unless you want
49 the kernel messages be output only to a serial port (in which case
50 you should say Y to "Console on serial port", below).
52 If you do say Y here, by default the currently visible virtual
53 terminal (/dev/tty0) will be used as system console. You can change
54 that with a kernel command line option such as "console=tty3" which
55 would use the third virtual terminal as system console. (Try "man
56 bootparam" or see the documentation of your boot loader (lilo or
57 loadlin) about how to pass options to the kernel at boot time.)
63 depends on VT && !S390 && !UML
66 config VT_HW_CONSOLE_BINDING
67 bool "Support for binding and unbinding console drivers"
71 The virtual terminal is the device that interacts with the physical
72 terminal through console drivers. On these systems, at least one
73 console driver is loaded. In other configurations, additional console
74 drivers may be enabled, such as the framebuffer console. If more than
75 1 console driver is enabled, setting this to 'y' will allow you to
76 select the console driver that will serve as the backend for the
79 See <file:Documentation/console/console.txt> for more
80 information. For framebuffer console users, please refer to
81 <file:Documentation/fb/fbcon.txt>.
83 config SERIAL_NONSTANDARD
84 bool "Non-standard serial port support"
87 Say Y here if you have any non-standard serial boards -- boards
88 which aren't supported using the standard "dumb" serial driver.
89 This includes intelligent serial boards such as Cyclades,
90 Digiboards, etc. These are usually used for systems that need many
91 serial ports because they serve many terminals or dial-in
94 Note that the answer to this question won't directly affect the
95 kernel: saying N will just cause the configurator to skip all
96 the questions about non-standard serial boards.
98 Most people can say N here.
101 tristate "Computone IntelliPort Plus serial support"
102 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
104 This driver supports the entire family of Intelliport II/Plus
105 controllers with the exception of the MicroChannel controllers and
106 products previous to the Intelliport II. These are multiport cards,
107 which give you many serial ports. You would need something like this
108 to connect more than two modems to your Linux box, for instance in
109 order to become a dial-in server. If you have a card like that, say
110 Y here and read <file:Documentation/computone.txt>.
112 To compile this driver as modules, choose M here: the
113 modules will be called ip2 and ip2main.
116 tristate "Comtrol RocketPort support"
117 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
119 This driver supports Comtrol RocketPort and RocketModem PCI boards.
120 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
121 modems. For information about the RocketPort/RocketModem boards
122 and this driver read <file:Documentation/rocket.txt>.
124 To compile this driver as a module, choose M here: the
125 module will be called rocket.
127 If you want to compile this driver into the kernel, say Y here. If
128 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
131 tristate "Cyclades async mux support"
132 depends on SERIAL_NONSTANDARD && (PCI || ISA)
135 This driver supports Cyclades Z and Y multiserial boards.
136 You would need something like this to connect more than two modems to
137 your Linux box, for instance in order to become a dial-in server.
139 For information about the Cyclades-Z card, read
140 <file:Documentation/README.cycladesZ>.
142 To compile this driver as a module, choose M here: the
143 module will be called cyclades.
145 If you haven't heard about it, it's safe to say N.
148 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
149 depends on EXPERIMENTAL && CYCLADES
151 The Cyclades-Z family of multiport cards allows 2 (two) driver op
152 modes: polling and interrupt. In polling mode, the driver will check
153 the status of the Cyclades-Z ports every certain amount of time
154 (which is called polling cycle and is configurable). In interrupt
155 mode, it will use an interrupt line (IRQ) in order to check the
156 status of the Cyclades-Z ports. The default op mode is polling. If
160 tristate "Digiboard Intelligent Async Support"
161 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
163 This is a driver for Digi International's Xx, Xeve, and Xem series
164 of cards which provide multiple serial ports. You would need
165 something like this to connect more than two modems to your Linux
166 box, for instance in order to become a dial-in server. This driver
167 supports the original PC (ISA) boards as well as PCI, and EISA. If
168 you have a card like this, say Y here and read the file
169 <file:Documentation/digiepca.txt>.
171 To compile this driver as a module, choose M here: the
172 module will be called epca.
175 tristate "Hayes ESP serial port support"
176 depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API
178 This is a driver which supports Hayes ESP serial ports. Both single
179 port cards and multiport cards are supported. Make sure to read
180 <file:Documentation/hayes-esp.txt>.
182 To compile this driver as a module, choose M here: the
183 module will be called esp.
188 tristate "Moxa Intellio support"
189 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
191 Say Y here if you have a Moxa Intellio multiport serial card.
193 To compile this driver as a module, choose M here: the
194 module will be called moxa.
197 tristate "Moxa SmartIO support (OBSOLETE)"
198 depends on SERIAL_NONSTANDARD
200 Say Y here if you have a Moxa SmartIO multiport serial card.
202 This driver can also be built as a module ( = code which can be
203 inserted in and removed from the running kernel whenever you want).
204 The module will be called mxser. If you want to do that, say M
207 config MOXA_SMARTIO_NEW
208 tristate "Moxa SmartIO support v. 2.0"
209 depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
211 Say Y here if you have a Moxa SmartIO multiport serial card and/or
212 want to help develop a new version of this driver.
214 This is upgraded (1.9.1) driver from original Moxa drivers with
215 changes finally resulting in PCI probing.
217 This driver can also be built as a module. The module will be called
218 mxser_new. If you want to do that, say M here.
221 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
222 depends on SERIAL_NONSTANDARD && PCI
225 This is a driver for the Multi-Tech cards which provide several
226 serial ports. The driver is experimental and can currently only be
227 built as a module. The module will be called isicom.
228 If you want to do that, choose M here.
231 tristate "Microgate SyncLink card support"
232 depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
234 Provides support for the SyncLink ISA and PCI multiprotocol serial
235 adapters. These adapters support asynchronous and HDLC bit
236 synchronous communication up to 10Mbps (PCI adapter).
238 This driver can only be built as a module ( = code which can be
239 inserted in and removed from the running kernel whenever you want).
240 The module will be called synclink. If you want to do that, say M
244 tristate "SyncLink Multiport support"
245 depends on SERIAL_NONSTANDARD && PCI
247 Enable support for the SyncLink Multiport (2 or 4 ports)
248 serial adapter, running asynchronous and HDLC communications up
249 to 2.048Mbps. Each ports is independently selectable for
250 RS-232, V.35, RS-449, RS-530, and X.21
252 This driver may be built as a module ( = code which can be
253 inserted in and removed from the running kernel whenever you want).
254 The module will be called synclinkmp. If you want to do that, say M
258 tristate "SyncLink GT/AC support"
259 depends on SERIAL_NONSTANDARD && PCI
261 Support for SyncLink GT and SyncLink AC families of
262 synchronous and asynchronous serial adapters
263 manufactured by Microgate Systems, Ltd. (www.microgate.com)
266 tristate "HDLC line discipline support"
267 depends on SERIAL_NONSTANDARD
269 Allows synchronous HDLC communications with tty device drivers that
270 support synchronous HDLC such as the Microgate SyncLink adapter.
272 This driver can only be built as a module ( = code which can be
273 inserted in and removed from the running kernel whenever you want).
274 The module will be called n_hdlc. If you want to do that, say M
278 tristate "SDL RISCom/8 card support"
279 depends on SERIAL_NONSTANDARD
281 This is a driver for the SDL Communications RISCom/8 multiport card,
282 which gives you many serial ports. You would need something like
283 this to connect more than two modems to your Linux box, for instance
284 in order to become a dial-in server. If you have a card like that,
285 say Y here and read the file <file:Documentation/riscom8.txt>.
287 Also it's possible to say M here and compile this driver as kernel
288 loadable module; the module will be called riscom8.
291 tristate "Specialix IO8+ card support"
292 depends on SERIAL_NONSTANDARD
294 This is a driver for the Specialix IO8+ multiport card (both the
295 ISA and the PCI version) which gives you many serial ports. You
296 would need something like this to connect more than two modems to
297 your Linux box, for instance in order to become a dial-in server.
299 If you have a card like that, say Y here and read the file
300 <file:Documentation/specialix.txt>. Also it's possible to say M here
301 and compile this driver as kernel loadable module which will be
304 config SPECIALIX_RTSCTS
305 bool "Specialix DTR/RTS pin is RTS"
308 The Specialix IO8+ card can only support either RTS or DTR. If you
309 say N here, the driver will use the pin as "DTR" when the tty is in
310 software handshake mode. If you say Y here or hardware handshake is
311 on, it will always be RTS. Read the file
312 <file:Documentation/specialix.txt> for more information.
315 tristate "Specialix SX (and SI) card support"
316 depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
318 This is a driver for the SX and SI multiport serial cards.
319 Please read the file <file:Documentation/sx.txt> for details.
321 This driver can only be built as a module ( = code which can be
322 inserted in and removed from the running kernel whenever you want).
323 The module will be called sx. If you want to do that, say M here.
326 tristate "Specialix RIO system support"
327 depends on SERIAL_NONSTANDARD
329 This is a driver for the Specialix RIO, a smart serial card which
330 drives an outboard box that can support up to 128 ports. Product
331 information is at <http://www.perle.com/support/documentation.html#multiport>.
332 There are both ISA and PCI versions.
335 bool "Support really old RIO/PCI cards"
338 Older RIO PCI cards need some initialization-time configuration to
339 determine the IRQ and some control addresses. If you have a RIO and
340 this doesn't seem to work, try setting this to Y.
343 bool "Stallion multiport serial support"
344 depends on SERIAL_NONSTANDARD
346 Stallion cards give you many serial ports. You would need something
347 like this to connect more than two modems to your Linux box, for
348 instance in order to become a dial-in server. If you say Y here,
349 you will be asked for your specific card model in the next
350 questions. Make sure to read <file:Documentation/stallion.txt> in
351 this case. If you have never heard about all this, it's safe to
355 tristate "Stallion EasyIO or EC8/32 support"
356 depends on STALDRV && BROKEN_ON_SMP && (ISA || EISA || PCI)
358 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
359 card, then this is for you; say Y. Make sure to read
360 <file:Documentation/stallion.txt>.
362 To compile this driver as a module, choose M here: the
363 module will be called stallion.
366 tristate "Stallion EC8/64, ONboard, Brumby support"
367 depends on STALDRV && BROKEN_ON_SMP && (ISA || EISA || PCI)
369 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
370 serial multiport card, say Y here. Make sure to read
371 <file:Documentation/stallion.txt>.
373 To compile this driver as a module, choose M here: the
374 module will be called istallion.
377 tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
378 depends on PCI && EXPERIMENTAL
380 If you have a HSDPA driver Broadband Wireless Data Card -
381 Globe Trotter PCMCIA card, say Y here.
383 To compile this driver as a module, choose M here, the module
384 will be called nozomi.
387 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
388 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
390 This option supports the 2232 7-port serial card shipped with the
391 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
392 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
393 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
394 ports were connected with 8 pin DIN connectors on the card bracket,
395 for which 8 pin to DB25 adapters were supplied. The card also had
396 jumpers internally to toggle various pinning configurations.
398 This driver can be built as a module; but then "generic_serial"
399 will also be built as a module. This has to be loaded before
400 "ser_a2232". If you want to do this, answer M here.
403 bool "SGI Altix system controller communication support"
404 depends on (IA64_SGI_SN2 || IA64_GENERIC)
406 If you have an SGI Altix and you want to enable system
407 controller communication from user space (you want this!),
408 say Y. Otherwise, say N.
411 bool "SGI TIO CX driver support"
412 depends on (IA64_SGI_SN2 || IA64_GENERIC)
414 If you have an SGI Altix and you have fpga devices attached
415 to your TIO, say Y here, otherwise say N.
418 tristate "SGI FPGA Core Services driver support"
421 If you have an SGI Altix with an attached SABrick
422 say Y or M here, otherwise say N.
424 source "drivers/serial/Kconfig"
427 bool "Unix98 PTY support" if EMBEDDED
430 A pseudo terminal (PTY) is a software device consisting of two
431 halves: a master and a slave. The slave device behaves identical to
432 a physical terminal; the master device is used by a process to
433 read data from and write data to the slave, thereby emulating a
434 terminal. Typical programs for the master side are telnet servers
437 Linux has traditionally used the BSD-like names /dev/ptyxx for
438 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
439 has a number of problems. The GNU C library glibc 2.1 and later,
440 however, supports the Unix98 naming standard: in order to acquire a
441 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
442 terminal is then made available to the process and the pseudo
443 terminal slave can be accessed as /dev/pts/<number>. What was
444 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
446 All modern Linux systems use the Unix98 ptys. Say Y unless
447 you're on an embedded system and want to conserve memory.
450 bool "Legacy (BSD) PTY support"
453 A pseudo terminal (PTY) is a software device consisting of two
454 halves: a master and a slave. The slave device behaves identical to
455 a physical terminal; the master device is used by a process to
456 read data from and write data to the slave, thereby emulating a
457 terminal. Typical programs for the master side are telnet servers
460 Linux has traditionally used the BSD-like names /dev/ptyxx
461 for masters and /dev/ttyxx for slaves of pseudo
462 terminals. This scheme has a number of problems, including
463 security. This option enables these legacy devices; on most
464 systems, it is safe to say N.
467 config LEGACY_PTY_COUNT
468 int "Maximum number of legacy PTY in use"
469 depends on LEGACY_PTYS
473 The maximum number of legacy PTYs that can be used at any one time.
474 The default is 256, and should be more than enough. Embedded
475 systems may want to reduce this to save memory.
477 When not in use, each legacy PTY occupies 12 bytes on 32-bit
478 architectures and 24 bytes on 64-bit architectures.
481 tristate 'Total Impact briQ front panel driver'
484 The briQ is a small footprint CHRP computer with a frontpanel VFD, a
485 tristate led and two switches. It is the size of a CDROM drive.
487 If you have such one and want anything showing on the VFD then you
490 To compile this driver as a module, choose M here: the
491 module will be called briq_panel.
493 It's safe to say N here.
496 tristate "Parallel printer support"
499 If you intend to attach a printer to the parallel port of your Linux
500 box (as opposed to using a serial printer; if the connector at the
501 printer has 9 or 25 holes ["female"], then it's serial), say Y.
502 Also read the Printing-HOWTO, available from
503 <http://www.tldp.org/docs.html#howto>.
505 It is possible to share one parallel port among several devices
506 (e.g. printer and ZIP drive) and it is safe to compile the
507 corresponding drivers into the kernel.
509 To compile this driver as a module, choose M here and read
510 <file:Documentation/parport.txt>. The module will be called lp.
512 If you have several parallel ports, you can specify which ports to
513 use with the "lp" kernel command line option. (Try "man bootparam"
514 or see the documentation of your boot loader (lilo or loadlin) about
515 how to pass options to the kernel at boot time.) The syntax of the
516 "lp" command line option can be found in <file:drivers/char/lp.c>.
518 If you have more than 8 printers, you need to increase the LP_NO
519 macro in lp.c and the PARPORT_MAX macro in parport.h.
522 bool "Support for console on line printer"
525 If you want kernel messages to be printed out as they occur, you
526 can have a console on the printer. This option adds support for
527 doing that; to actually get it to happen you need to pass the
528 option "console=lp0" to the kernel at boot time.
530 If the printer is out of paper (or off, or unplugged, or too
531 busy..) the kernel will stall until the printer is ready again.
532 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
533 can make the kernel continue when this happens,
534 but it'll lose the kernel messages.
539 tristate "Support for user-space parallel port device drivers"
542 Saying Y to this adds support for /dev/parport device nodes. This
543 is needed for programs that want portable access to the parallel
544 port, for instance deviceid (which displays Plug-and-Play device
547 This is the parallel port equivalent of SCSI generic support (sg).
548 It is safe to say N to this -- it is not needed for normal printing
549 or parallel port CD-ROM/disk support.
551 To compile this driver as a module, choose M here: the
552 module will be called ppdev.
559 Generic "hypervisor virtual console" infrastructure for various
560 hypervisors (pSeries, iSeries, Xen, lguest).
561 It will automatically be selected if one of the back-end console drivers
566 bool "pSeries Hypervisor Virtual Console support"
567 depends on PPC_PSERIES
570 pSeries machines when partitioned support a hypervisor virtual
571 console. This driver allows each pSeries partition to have a console
572 which is accessed via the HMC.
575 bool "iSeries Hypervisor Virtual Console support"
576 depends on PPC_ISERIES
580 iSeries machines support a hypervisor virtual console.
583 bool "IBM RTAS Console support"
587 IBM Console device driver which makes use of RTAS
590 bool "Toshiba's Beat Hypervisor Console support"
591 depends on PPC_CELLEB
594 Toshiba's Cell Reference Set Beat Console device driver
597 bool "Xen Hypervisor Console support"
602 Xen virtual console device driver
604 config VIRTIO_CONSOLE
609 tristate "IBM Hypervisor Virtual Console Server support"
610 depends on PPC_PSERIES
612 Partitionable IBM Power5 ppc64 machines allow hosting of
613 firmware virtual consoles from one Linux partition by
614 another Linux partition. This driver allows console data
615 from Linux partitions to be accessed through TTY device
616 interfaces in the device tree of a Linux partition running
619 To compile this driver as a module, choose M here: the
620 module will be called hvcs.ko. Additionally, this module
621 will depend on arch specific APIs exported from hvcserver.ko
622 which will also be compiled when this driver is built as a
625 source "drivers/char/ipmi/Kconfig"
628 tristate "NetWinder thermometer support"
629 depends on ARCH_NETWINDER
631 Say Y here to include support for the thermal management hardware
632 found in the NetWinder. This driver allows the user to control the
633 temperature set points and to read the current temperature.
635 It is also possible to say M here to build it as a module (ds1620)
636 It is recommended to be used on a NetWinder, but it is not a
640 tristate "NetWinder Button"
641 depends on ARCH_NETWINDER
643 If you say Y here and create a character device node /dev/nwbutton
644 with major and minor numbers 10 and 158 ("man mknod"), then every
645 time the orange button is pressed a number of times, the number of
646 times the button was pressed will be written to that device.
648 This is most useful for applications, as yet unwritten, which
649 perform actions based on how many times the button is pressed in a
652 Do not hold the button down for too long, as the driver does not
653 alter the behaviour of the hardware reset circuitry attached to the
654 button; it will still execute a hard reset if the button is held
655 down for longer than approximately five seconds.
657 To compile this driver as a module, choose M here: the
658 module will be called nwbutton.
660 Most people will answer Y to this question and "Reboot Using Button"
661 below to be able to initiate a system shutdown from the button.
663 config NWBUTTON_REBOOT
664 bool "Reboot Using Button"
667 If you say Y here, then you will be able to initiate a system
668 shutdown and reboot by pressing the orange button a number of times.
669 The number of presses to initiate the shutdown is two by default,
670 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
671 in nwbutton.h and recompiling the driver or, if you compile the
672 driver as a module, you can specify the number of presses at load
673 time with "insmod button reboot_count=<something>".
676 tristate "NetWinder flash support"
677 depends on ARCH_NETWINDER
679 If you say Y here and create a character device /dev/flash with
680 major 10 and minor 160 you can manipulate the flash ROM containing
681 the NetWinder firmware. Be careful as accidentally overwriting the
682 flash contents can render your computer unbootable. On no account
683 allow random users access to this device. :-)
685 To compile this driver as a module, choose M here: the
686 module will be called nwflash.
688 If you're not sure, say N.
690 source "drivers/char/hw_random/Kconfig"
693 tristate "/dev/nvram support"
694 depends on ATARI || X86 || ARM || GENERIC_NVRAM
696 If you say Y here and create a character special file /dev/nvram
697 with major number 10 and minor number 144 using mknod ("man mknod"),
698 you get read and write access to the extra bytes of non-volatile
699 memory in the real time clock (RTC), which is contained in every PC
700 and most Ataris. The actual number of bytes varies, depending on the
701 nvram in the system, but is usually 114 (128-14 for the RTC).
703 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
704 on Ataris. /dev/nvram may be used to view settings there, or to
705 change them (with some utility). It could also be used to frequently
706 save a few bits of very important data that may not be lost over
707 power-off and for which writing to disk is too insecure. Note
708 however that most NVRAM space in a PC belongs to the BIOS and you
709 should NEVER idly tamper with it. See Ralf Brown's interrupt list
710 for a guide to the use of CMOS bytes by your BIOS.
712 On Atari machines, /dev/nvram is always configured and does not need
715 To compile this driver as a module, choose M here: the
716 module will be called nvram.
719 tristate "Enhanced Real Time Clock Support"
720 depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV && !ARM && !SUPERH && !S390
722 If you say Y here and create a character special file /dev/rtc with
723 major number 10 and minor number 135 using mknod ("man mknod"), you
724 will get access to the real time clock (or hardware clock) built
727 Every PC has such a clock built in. It can be used to generate
728 signals from as low as 1Hz up to 8192Hz, and can also be used
729 as a 24 hour alarm. It reports status information via the file
730 /proc/driver/rtc and its behaviour is set by various ioctls on
733 If you run Linux on a multiprocessor machine and said Y to
734 "Symmetric Multi Processing" above, you should say Y here to read
735 and set the RTC in an SMP compatible fashion.
737 If you think you have a use for such a device (such as periodic data
738 sampling), then say Y here, and read <file:Documentation/rtc.txt>
741 To compile this driver as a module, choose M here: the
742 module will be called rtc.
745 tristate "Enhanced Real Time Clock Support"
746 depends on SPARC32 && PCI
748 If you say Y here and create a character special file /dev/rtc with
749 major number 10 and minor number 135 using mknod ("man mknod"), you
750 will get access to the real time clock (or hardware clock) built
753 Every PC has such a clock built in. It can be used to generate
754 signals from as low as 1Hz up to 8192Hz, and can also be used
755 as a 24 hour alarm. It reports status information via the file
756 /proc/driver/rtc and its behaviour is set by various ioctls on
759 If you think you have a use for such a device (such as periodic data
760 sampling), then say Y here, and read <file:Documentation/rtc.txt>
763 To compile this driver as a module, choose M here: the
764 module will be called js-rtc.
767 tristate "SGI DS1286 RTC support"
768 depends on SGI_HAS_DS1286
770 If you say Y here and create a character special file /dev/rtc with
771 major number 10 and minor number 135 using mknod ("man mknod"), you
772 will get access to the real time clock built into your computer.
773 Every SGI has such a clock built in. It reports status information
774 via the file /proc/rtc and its behaviour is set by various ioctls on
778 bool "SGI M48T35 RTC support"
781 If you say Y here and create a character special file /dev/rtc with
782 major number 10 and minor number 135 using mknod ("man mknod"), you
783 will get access to the real time clock built into your computer.
784 Every SGI has such a clock built in. It reports status information
785 via the file /proc/rtc and its behaviour is set by various ioctls on
789 tristate "Generic /dev/rtc emulation"
790 depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH
792 If you say Y here and create a character special file /dev/rtc with
793 major number 10 and minor number 135 using mknod ("man mknod"), you
794 will get access to the real time clock (or hardware clock) built
797 It reports status information via the file /proc/driver/rtc and its
798 behaviour is set by various ioctls on /dev/rtc. If you enable the
799 "extended RTC operation" below it will also provide an emulation
800 for RTC_UIE which is required by some programs and may improve
801 precision in some cases.
803 To compile this driver as a module, choose M here: the
804 module will be called genrtc.
807 bool "Extended RTC operation"
810 Provides an emulation for RTC_UIE which is required by some programs
811 and may improve precision of the generic RTC support in some cases.
814 bool "EFI Real Time Clock Services"
818 tristate "DS1302 RTC support"
819 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
821 If you say Y here and create a character special file /dev/rtc with
822 major number 121 and minor number 0 using mknod ("man mknod"), you
823 will get access to the real time clock (or hardware clock) built
827 bool "Support for Cobalt LCD"
828 depends on MIPS_COBALT
830 This option enables support for the LCD display and buttons found
831 on Cobalt systems through a misc device.
834 tristate "Double Talk PC internal speech card support"
837 This driver is for the DoubleTalk PC, a speech synthesizer
838 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
839 called the `internal DoubleTalk'.
841 To compile this driver as a module, choose M here: the
842 module will be called dtlk.
845 tristate "Siemens R3964 line discipline"
847 This driver allows synchronous communication with devices using the
848 Siemens R3964 packet protocol. Unless you are dealing with special
849 hardware like PLCs, you are unlikely to need this.
851 To compile this driver as a module, choose M here: the
852 module will be called n_r3964.
857 tristate "Applicom intelligent fieldbus card support"
860 This driver provides the kernel-side support for the intelligent
861 fieldbus cards made by Applicom International. More information
862 about these cards can be found on the WWW at the address
863 <http://www.applicom-int.com/>, or by email from David Woodhouse
864 <dwmw2@infradead.org>.
866 To compile this driver as a module, choose M here: the
867 module will be called applicom.
872 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
873 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
875 This driver enables access to the Sony Programmable I/O Control
876 Device which can be found in many (all ?) Sony Vaio laptops.
878 If you have one of those laptops, read
879 <file:Documentation/sonypi.txt>, and say Y or M here.
881 To compile this driver as a module, choose M here: the
882 module will be called sonypi.
885 tristate "TANBAC TB0219 GPIO support"
886 depends on TANBAC_TB022X
889 source "drivers/char/pcmcia/Kconfig"
892 tristate "ACP Modem (Mwave) support"
896 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
897 kernel driver and a user level application. Together these components
898 support direct attachment to public switched telephone networks (PSTNs)
899 and support selected world wide countries.
901 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
902 600, and 770 that include on board ACP modem hardware.
904 The modem also supports the standard communications port interface
905 (ttySx) and is compatible with the Hayes AT Command Set.
907 The user level application needed to use this driver can be found at
908 the IBM Linux Technology Center (LTC) web site:
909 <http://www.ibm.com/linux/ltc/>.
911 If you own one of the above IBM Thinkpads which has the Mwave chipset
914 To compile this driver as a module, choose M here: the
915 module will be called mwave.
918 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 "NatSemi PC8736x GPIO Support"
930 default SCx200_GPIO # mostly N
931 select NSC_GPIO # needed for support routines
933 Give userspace access to the GPIO pins on the National
934 Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
935 has multiple functional units, inc several managed by
936 hwmon/pc87360 driver. Tested with PC-87366
938 If compiled as a module, it will be called pc8736x_gpio.
941 tristate "NatSemi Base GPIO Support"
943 # selected by SCx200_GPIO and PC8736x_GPIO
944 # what about 2 selectors differing: m != y
946 Common support used (and needed) by scx200_gpio and
947 pc8736x_gpio drivers. If those drivers are built as
948 modules, this one will be too, named nsc_gpio
951 tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
954 Give userspace access to the GPIO pins on the AMD CS5535 and
955 CS5536 Geode companion devices.
957 If compiled as a module, it will be called cs5535_gpio.
960 tristate "NEC VR4100 series General-purpose I/O Unit support"
961 depends on CPU_VR41XX
964 tristate "RAW driver (/dev/raw/rawN)"
967 The raw driver permits block devices to be bound to /dev/raw/rawN.
968 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
969 See the raw(8) manpage for more details.
971 Applications should preferably open the device (eg /dev/hda1)
972 with the O_DIRECT flag.
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
984 bool "HPET - High Precision Event Timer" if (X86 || IA64)
988 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
989 open selects one of the timers supported by the HPET. The timers are
990 non-periodic and/or periodic.
993 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
997 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
998 is assumed the platform called hpet_alloc with the RTC IRQ values for
1002 bool "Allow mmap of HPET"
1006 If you say Y here, user applications will be able to mmap
1009 In some hardware implementations, the page containing HPET
1010 registers may also contain other things that shouldn't be
1011 exposed to the user. If this applies to your hardware,
1014 config HANGCHECK_TIMER
1015 tristate "Hangcheck timer"
1016 depends on X86 || IA64 || PPC64 || S390
1018 The hangcheck-timer module detects when the system has gone
1019 out to lunch past a certain margin. It can reboot the system
1020 or merely print a warning.
1023 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1024 depends on IA64_GENERIC || IA64_SGI_SN2
1027 The mmtimer device allows direct userspace access to the
1030 source "drivers/char/tpm/Kconfig"
1033 tristate "Telecom clock driver for ATCA SBC"
1034 depends on EXPERIMENTAL && X86
1037 The telecom clock device is specific to the MPCBL0010 and MPCBL0050
1038 ATCA computers and allows direct userspace access to the
1039 configuration of the telecom clock configuration settings. This
1040 device is used for hardware synchronization across the ATCA backplane
1041 fabric. Upon loading, the driver exports a sysfs directory,
1042 /sys/devices/platform/telco_clock, with a number of files for
1043 controlling the behavior of this hardware.
1048 depends on ISA || PCI
1051 source "drivers/s390/char/Kconfig"
projects / linux-2.6 / blob