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 VT_HW_CONSOLE_BINDING
66 bool "Support for binding and unbinding console drivers"
70 The virtual terminal is the device that interacts with the physical
71 terminal through console drivers. On these systems, at least one
72 console driver is loaded. In other configurations, additional console
73 drivers may be enabled, such as the framebuffer console. If more than
74 1 console driver is enabled, setting this to 'y' will allow you to
75 select the console driver that will serve as the backend for the
78 See <file:Documentation/console/console.txt> for more
79 information. For framebuffer console users, please refer to
80 <file:Documentation/fb/fbcon.txt>.
82 config SERIAL_NONSTANDARD
83 bool "Non-standard serial port support"
85 Say Y here if you have any non-standard serial boards -- boards
86 which aren't supported using the standard "dumb" serial driver.
87 This includes intelligent serial boards such as Cyclades,
88 Digiboards, etc. These are usually used for systems that need many
89 serial ports because they serve many terminals or dial-in
92 Note that the answer to this question won't directly affect the
93 kernel: saying N will just cause the configurator to skip all
94 the questions about non-standard serial boards.
96 Most people can say N here.
99 tristate "Computone IntelliPort Plus serial support"
100 depends on SERIAL_NONSTANDARD
102 This driver supports the entire family of Intelliport II/Plus
103 controllers with the exception of the MicroChannel controllers and
104 products previous to the Intelliport II. These are multiport cards,
105 which give you many serial ports. You would need something like this
106 to connect more than two modems to your Linux box, for instance in
107 order to become a dial-in server. If you have a card like that, say
108 Y here and read <file:Documentation/computone.txt>.
110 To compile this driver as modules, choose M here: the
111 modules will be called ip2 and ip2main.
114 tristate "Comtrol RocketPort support"
115 depends on SERIAL_NONSTANDARD
117 This driver supports Comtrol RocketPort and RocketModem PCI boards.
118 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
119 modems. For information about the RocketPort/RocketModem boards
120 and this driver read <file:Documentation/rocket.txt>.
122 To compile this driver as a module, choose M here: the
123 module will be called rocket.
125 If you want to compile this driver into the kernel, say Y here. If
126 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
129 tristate "Cyclades async mux support"
130 depends on SERIAL_NONSTANDARD
132 This driver supports Cyclades Z and Y multiserial boards.
133 You would need something like this to connect more than two modems to
134 your Linux box, for instance in order to become a dial-in server.
136 For information about the Cyclades-Z card, read
137 <file:drivers/char/README.cycladesZ>.
139 To compile this driver as a module, choose M here: the
140 module will be called cyclades.
142 If you haven't heard about it, it's safe to say N.
145 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
146 depends on EXPERIMENTAL && CYCLADES
148 The Cyclades-Z family of multiport cards allows 2 (two) driver op
149 modes: polling and interrupt. In polling mode, the driver will check
150 the status of the Cyclades-Z ports every certain amount of time
151 (which is called polling cycle and is configurable). In interrupt
152 mode, it will use an interrupt line (IRQ) in order to check the
153 status of the Cyclades-Z ports. The default op mode is polling. If
157 tristate "Digiboard Intelligent Async Support"
158 depends on SERIAL_NONSTANDARD
160 This is a driver for Digi International's Xx, Xeve, and Xem series
161 of cards which provide multiple serial ports. You would need
162 something like this to connect more than two modems to your Linux
163 box, for instance in order to become a dial-in server. This driver
164 supports the original PC (ISA) boards as well as PCI, and EISA. If
165 you have a card like this, say Y here and read the file
166 <file:Documentation/digiepca.txt>.
168 To compile this driver as a module, choose M here: the
169 module will be called epca.
172 tristate "Hayes ESP serial port support"
173 depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API
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
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
209 This is a driver for the Multi-Tech cards which provide several
210 serial ports. The driver is experimental and can currently only be
211 built as a module. The module will be called isicom.
212 If you want to do that, choose M here.
215 tristate "Microgate SyncLink card support"
216 depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
218 Provides support for the SyncLink ISA and PCI multiprotocol serial
219 adapters. These adapters support asynchronous and HDLC bit
220 synchronous communication up to 10Mbps (PCI adapter).
222 This driver can only be built as a module ( = code which can be
223 inserted in and removed from the running kernel whenever you want).
224 The module will be called synclink. If you want to do that, say M
228 tristate "SyncLink Multiport support"
229 depends on SERIAL_NONSTANDARD
231 Enable support for the SyncLink Multiport (2 or 4 ports)
232 serial adapter, running asynchronous and HDLC communications up
233 to 2.048Mbps. Each ports is independently selectable for
234 RS-232, V.35, RS-449, RS-530, and X.21
236 This driver may be built as a module ( = code which can be
237 inserted in and removed from the running kernel whenever you want).
238 The module will be called synclinkmp. If you want to do that, say M
242 tristate "SyncLink GT/AC support"
243 depends on SERIAL_NONSTANDARD && PCI
245 Support for SyncLink GT and SyncLink AC families of
246 synchronous and asynchronous serial adapters
247 manufactured by Microgate Systems, Ltd. (www.microgate.com)
250 tristate "HDLC line discipline support"
251 depends on SERIAL_NONSTANDARD
253 Allows synchronous HDLC communications with tty device drivers that
254 support synchronous HDLC such as the Microgate SyncLink adapter.
256 This driver can only be built as a module ( = code which can be
257 inserted in and removed from the running kernel whenever you want).
258 The module will be called n_hdlc. If you want to do that, say M
262 tristate "SDL RISCom/8 card support"
263 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
265 This is a driver for the SDL Communications RISCom/8 multiport card,
266 which gives you many serial ports. You would need something like
267 this to connect more than two modems to your Linux box, for instance
268 in order to become a dial-in server. If you have a card like that,
269 say Y here and read the file <file:Documentation/riscom8.txt>.
271 Also it's possible to say M here and compile this driver as kernel
272 loadable module; the module will be called riscom8.
275 tristate "Specialix IO8+ card support"
276 depends on SERIAL_NONSTANDARD
278 This is a driver for the Specialix IO8+ multiport card (both the
279 ISA and the PCI version) which gives you many serial ports. You
280 would need something like this to connect more than two modems to
281 your Linux box, for instance in order to become a dial-in server.
283 If you have a card like that, say Y here and read the file
284 <file:Documentation/specialix.txt>. Also it's possible to say M here
285 and compile this driver as kernel loadable module which will be
288 config SPECIALIX_RTSCTS
289 bool "Specialix DTR/RTS pin is RTS"
292 The Specialix IO8+ card can only support either RTS or DTR. If you
293 say N here, the driver will use the pin as "DTR" when the tty is in
294 software handshake mode. If you say Y here or hardware handshake is
295 on, it will always be RTS. Read the file
296 <file:Documentation/specialix.txt> for more information.
299 tristate "Specialix SX (and SI) card support"
300 depends on SERIAL_NONSTANDARD
302 This is a driver for the SX and SI multiport serial cards.
303 Please read the file <file:Documentation/sx.txt> for details.
305 This driver can only be built as a module ( = code which can be
306 inserted in and removed from the running kernel whenever you want).
307 The module will be called sx. If you want to do that, say M here.
310 tristate "Specialix RIO system support"
311 depends on SERIAL_NONSTANDARD
313 This is a driver for the Specialix RIO, a smart serial card which
314 drives an outboard box that can support up to 128 ports. Product
315 information is at <http://www.perle.com/support/documentation.html#multiport>.
316 There are both ISA and PCI versions.
319 bool "Support really old RIO/PCI cards"
322 Older RIO PCI cards need some initialization-time configuration to
323 determine the IRQ and some control addresses. If you have a RIO and
324 this doesn't seem to work, try setting this to Y.
327 bool "Stallion multiport serial support"
328 depends on SERIAL_NONSTANDARD
330 Stallion cards give you many serial ports. You would need something
331 like this to connect more than two modems to your Linux box, for
332 instance in order to become a dial-in server. If you say Y here,
333 you will be asked for your specific card model in the next
334 questions. Make sure to read <file:Documentation/stallion.txt> in
335 this case. If you have never heard about all this, it's safe to
339 tristate "Stallion EasyIO or EC8/32 support"
340 depends on STALDRV && BROKEN_ON_SMP
342 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
343 card, then this is for you; say Y. Make sure to read
344 <file:Documentation/stallion.txt>.
346 To compile this driver as a module, choose M here: the
347 module will be called stallion.
350 tristate "Stallion EC8/64, ONboard, Brumby support"
351 depends on STALDRV && BROKEN_ON_SMP
353 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
354 serial multiport card, say Y here. Make sure to read
355 <file:Documentation/stallion.txt>.
357 To compile this driver as a module, choose M here: the
358 module will be called istallion.
361 bool "Enable Au1000 UART Support"
362 depends on SERIAL_NONSTANDARD && MIPS
364 If you have an Alchemy AU1000 processor (MIPS based) and you want
365 to use serial ports, say Y. Otherwise, say N.
367 config AU1000_SERIAL_CONSOLE
368 bool "Enable Au1000 serial console"
369 depends on AU1000_UART
371 If you have an Alchemy AU1000 processor (MIPS based) and you want
372 to use a console on a serial port, say Y. Otherwise, say N.
375 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
376 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
378 This option supports the 2232 7-port serial card shipped with the
379 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
380 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
381 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
382 ports were connected with 8 pin DIN connectors on the card bracket,
383 for which 8 pin to DB25 adapters were supplied. The card also had
384 jumpers internally to toggle various pinning configurations.
386 This driver can be built as a module; but then "generic_serial"
387 will also be built as a module. This has to be loaded before
388 "ser_a2232". If you want to do this, answer M here.
391 bool "SGI Altix system controller communication support"
392 depends on (IA64_SGI_SN2 || IA64_GENERIC)
394 If you have an SGI Altix and you want to enable system
395 controller communication from user space (you want this!),
396 say Y. Otherwise, say N.
399 bool "SGI TIO CX driver support"
400 depends on (IA64_SGI_SN2 || IA64_GENERIC)
402 If you have an SGI Altix and you have fpga devices attached
403 to your TIO, say Y here, otherwise say N.
406 tristate "SGI FPGA Core Services driver support"
409 If you have an SGI Altix with an attached SABrick
410 say Y or M here, otherwise say N.
412 source "drivers/serial/Kconfig"
415 bool "Unix98 PTY support" if EMBEDDED
418 A pseudo terminal (PTY) is a software device consisting of two
419 halves: a master and a slave. The slave device behaves identical to
420 a physical terminal; the master device is used by a process to
421 read data from and write data to the slave, thereby emulating a
422 terminal. Typical programs for the master side are telnet servers
425 Linux has traditionally used the BSD-like names /dev/ptyxx for
426 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
427 has a number of problems. The GNU C library glibc 2.1 and later,
428 however, supports the Unix98 naming standard: in order to acquire a
429 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
430 terminal is then made available to the process and the pseudo
431 terminal slave can be accessed as /dev/pts/<number>. What was
432 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
434 All modern Linux systems use the Unix98 ptys. Say Y unless
435 you're on an embedded system and want to conserve memory.
438 bool "Legacy (BSD) PTY support"
441 A pseudo terminal (PTY) is a software device consisting of two
442 halves: a master and a slave. The slave device behaves identical to
443 a physical terminal; the master device is used by a process to
444 read data from and write data to the slave, thereby emulating a
445 terminal. Typical programs for the master side are telnet servers
448 Linux has traditionally used the BSD-like names /dev/ptyxx
449 for masters and /dev/ttyxx for slaves of pseudo
450 terminals. This scheme has a number of problems, including
451 security. This option enables these legacy devices; on most
452 systems, it is safe to say N.
455 config LEGACY_PTY_COUNT
456 int "Maximum number of legacy PTY in use"
457 depends on LEGACY_PTYS
461 The maximum number of legacy PTYs that can be used at any one time.
462 The default is 256, and should be more than enough. Embedded
463 systems may want to reduce this to save memory.
465 When not in use, each legacy PTY occupies 12 bytes on 32-bit
466 architectures and 24 bytes on 64-bit architectures.
469 tristate 'Total Impact briQ front panel driver'
472 The briQ is a small footprint CHRP computer with a frontpanel VFD, a
473 tristate led and two switches. It is the size of a CDROM drive.
475 If you have such one and want anything showing on the VFD then you
478 To compile this driver as a module, choose M here: the
479 module will be called briq_panel.
481 It's safe to say N here.
484 tristate "Parallel printer support"
487 If you intend to attach a printer to the parallel port of your Linux
488 box (as opposed to using a serial printer; if the connector at the
489 printer has 9 or 25 holes ["female"], then it's serial), say Y.
490 Also read the Printing-HOWTO, available from
491 <http://www.tldp.org/docs.html#howto>.
493 It is possible to share one parallel port among several devices
494 (e.g. printer and ZIP drive) and it is safe to compile the
495 corresponding drivers into the kernel.
497 To compile this driver as a module, choose M here and read
498 <file:Documentation/parport.txt>. The module will be called lp.
500 If you have several parallel ports, you can specify which ports to
501 use with the "lp" kernel command line option. (Try "man bootparam"
502 or see the documentation of your boot loader (lilo or loadlin) about
503 how to pass options to the kernel at boot time.) The syntax of the
504 "lp" command line option can be found in <file:drivers/char/lp.c>.
506 If you have more than 8 printers, you need to increase the LP_NO
507 macro in lp.c and the PARPORT_MAX macro in parport.h.
510 bool "Support for console on line printer"
513 If you want kernel messages to be printed out as they occur, you
514 can have a console on the printer. This option adds support for
515 doing that; to actually get it to happen you need to pass the
516 option "console=lp0" to the kernel at boot time.
518 If the printer is out of paper (or off, or unplugged, or too
519 busy..) the kernel will stall until the printer is ready again.
520 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
521 can make the kernel continue when this happens,
522 but it'll lose the kernel messages.
527 tristate "Support for user-space parallel port device drivers"
530 Saying Y to this adds support for /dev/parport device nodes. This
531 is needed for programs that want portable access to the parallel
532 port, for instance deviceid (which displays Plug-and-Play device
535 This is the parallel port equivalent of SCSI generic support (sg).
536 It is safe to say N to this -- it is not needed for normal printing
537 or parallel port CD-ROM/disk support.
539 To compile this driver as a module, choose M here: the
540 module will be called ppdev.
545 tristate "Texas Instruments parallel link cable support"
548 If you own a Texas Instruments graphing calculator and use a
549 parallel link cable, then you might be interested in this driver.
551 If you enable this driver, you will be able to communicate with
552 your calculator through a set of device nodes under /dev. The
553 main advantage of this driver is that you don't have to be root
554 to use this precise link cable (depending on the permissions on
555 the device nodes, though).
557 To compile this driver as a module, choose M here: the
558 module will be called tipar.
560 If you don't know what a parallel link cable is or what a Texas
561 Instruments graphing calculator is, then you probably don't need this
569 Users of pSeries machines that want to utilize the hvc console front-end
570 module for their backend console driver should select this option.
571 It will automatically be selected if one of the back-end console drivers
576 bool "pSeries Hypervisor Virtual Console support"
577 depends on PPC_PSERIES
580 pSeries machines when partitioned support a hypervisor virtual
581 console. This driver allows each pSeries partition to have a console
582 which is accessed via the HMC.
585 bool "iSeries Hypervisor Virtual Console support"
586 depends on PPC_ISERIES && !VIOCONS
589 iSeries machines support a hypervisor virtual console.
592 bool "IBM RTAS Console support"
596 IBM Console device driver which makes use of RTAS
599 tristate "IBM Hypervisor Virtual Console Server support"
600 depends on PPC_PSERIES
602 Partitionable IBM Power5 ppc64 machines allow hosting of
603 firmware virtual consoles from one Linux partition by
604 another Linux partition. This driver allows console data
605 from Linux partitions to be accessed through TTY device
606 interfaces in the device tree of a Linux partition running
609 To compile this driver as a module, choose M here: the
610 module will be called hvcs.ko. Additionally, this module
611 will depend on arch specific APIs exported from hvcserver.ko
612 which will also be compiled when this driver is built as a
615 source "drivers/char/ipmi/Kconfig"
617 source "drivers/char/watchdog/Kconfig"
620 tristate "NetWinder thermometer support"
621 depends on ARCH_NETWINDER
623 Say Y here to include support for the thermal management hardware
624 found in the NetWinder. This driver allows the user to control the
625 temperature set points and to read the current temperature.
627 It is also possible to say M here to build it as a module (ds1620)
628 It is recommended to be used on a NetWinder, but it is not a
632 tristate "NetWinder Button"
633 depends on ARCH_NETWINDER
635 If you say Y here and create a character device node /dev/nwbutton
636 with major and minor numbers 10 and 158 ("man mknod"), then every
637 time the orange button is pressed a number of times, the number of
638 times the button was pressed will be written to that device.
640 This is most useful for applications, as yet unwritten, which
641 perform actions based on how many times the button is pressed in a
644 Do not hold the button down for too long, as the driver does not
645 alter the behaviour of the hardware reset circuitry attached to the
646 button; it will still execute a hard reset if the button is held
647 down for longer than approximately five seconds.
649 To compile this driver as a module, choose M here: the
650 module will be called nwbutton.
652 Most people will answer Y to this question and "Reboot Using Button"
653 below to be able to initiate a system shutdown from the button.
655 config NWBUTTON_REBOOT
656 bool "Reboot Using Button"
659 If you say Y here, then you will be able to initiate a system
660 shutdown and reboot by pressing the orange button a number of times.
661 The number of presses to initiate the shutdown is two by default,
662 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
663 in nwbutton.h and recompiling the driver or, if you compile the
664 driver as a module, you can specify the number of presses at load
665 time with "insmod button reboot_count=<something>".
668 tristate "NetWinder flash support"
669 depends on ARCH_NETWINDER
671 If you say Y here and create a character device /dev/flash with
672 major 10 and minor 160 you can manipulate the flash ROM containing
673 the NetWinder firmware. Be careful as accidentally overwriting the
674 flash contents can render your computer unbootable. On no account
675 allow random users access to this device. :-)
677 To compile this driver as a module, choose M here: the
678 module will be called nwflash.
680 If you're not sure, say N.
682 source "drivers/char/hw_random/Kconfig"
685 tristate "/dev/nvram support"
686 depends on ATARI || X86 || ARM || GENERIC_NVRAM
688 If you say Y here and create a character special file /dev/nvram
689 with major number 10 and minor number 144 using mknod ("man mknod"),
690 you get read and write access to the extra bytes of non-volatile
691 memory in the real time clock (RTC), which is contained in every PC
692 and most Ataris. The actual number of bytes varies, depending on the
693 nvram in the system, but is usually 114 (128-14 for the RTC).
695 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
696 on Ataris. /dev/nvram may be used to view settings there, or to
697 change them (with some utility). It could also be used to frequently
698 save a few bits of very important data that may not be lost over
699 power-off and for which writing to disk is too insecure. Note
700 however that most NVRAM space in a PC belongs to the BIOS and you
701 should NEVER idly tamper with it. See Ralf Brown's interrupt list
702 for a guide to the use of CMOS bytes by your BIOS.
704 On Atari machines, /dev/nvram is always configured and does not need
707 To compile this driver as a module, choose M here: the
708 module will be called nvram.
711 tristate "Enhanced Real Time Clock Support"
712 depends on !PPC && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && !FRV && !ARM && !SUPERH
714 If you say Y here and create a character special file /dev/rtc with
715 major number 10 and minor number 135 using mknod ("man mknod"), you
716 will get access to the real time clock (or hardware clock) built
719 Every PC has such a clock built in. It can be used to generate
720 signals from as low as 1Hz up to 8192Hz, and can also be used
721 as a 24 hour alarm. It reports status information via the file
722 /proc/driver/rtc and its behaviour is set by various ioctls on
725 If you run Linux on a multiprocessor machine and said Y to
726 "Symmetric Multi Processing" above, you should say Y here to read
727 and set the RTC in an SMP compatible fashion.
729 If you think you have a use for such a device (such as periodic data
730 sampling), then say Y here, and read <file:Documentation/rtc.txt>
733 To compile this driver as a module, choose M here: the
734 module will be called rtc.
737 tristate "SGI DS1286 RTC support"
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 built into your computer.
743 Every SGI has such a clock built in. It reports status information
744 via the file /proc/rtc and its behaviour is set by various ioctls on
748 bool "SGI M48T35 RTC support"
751 If you say Y here and create a character special file /dev/rtc with
752 major number 10 and minor number 135 using mknod ("man mknod"), you
753 will get access to the real time clock built into your computer.
754 Every SGI has such a clock built in. It reports status information
755 via the file /proc/rtc and its behaviour is set by various ioctls on
759 tristate "Generic /dev/rtc emulation"
760 depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV
762 If you say Y here and create a character special file /dev/rtc with
763 major number 10 and minor number 135 using mknod ("man mknod"), you
764 will get access to the real time clock (or hardware clock) built
767 It reports status information via the file /proc/driver/rtc and its
768 behaviour is set by various ioctls on /dev/rtc. If you enable the
769 "extended RTC operation" below it will also provide an emulation
770 for RTC_UIE which is required by some programs and may improve
771 precision in some cases.
773 To compile this driver as a module, choose M here: the
774 module will be called genrtc.
777 bool "Extended RTC operation"
780 Provides an emulation for RTC_UIE which is required by some programs
781 and may improve precision of the generic RTC support in some cases.
784 bool "EFI Real Time Clock Services"
788 tristate "DS1302 RTC support"
789 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
791 If you say Y here and create a character special file /dev/rtc with
792 major number 121 and minor number 0 using mknod ("man mknod"), you
793 will get access to the real time clock (or hardware clock) built
797 bool "Support for Cobalt LCD"
798 depends on MIPS_COBALT
800 This option enables support for the LCD display and buttons found
801 on Cobalt systems through a misc device.
804 tristate "Double Talk PC internal speech card support"
806 This driver is for the DoubleTalk PC, a speech synthesizer
807 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
808 called the `internal DoubleTalk'.
810 To compile this driver as a module, choose M here: the
811 module will be called dtlk.
814 tristate "Siemens R3964 line discipline"
816 This driver allows synchronous communication with devices using the
817 Siemens R3964 packet protocol. Unless you are dealing with special
818 hardware like PLCs, you are unlikely to need this.
820 To compile this driver as a module, choose M here: the
821 module will be called n_r3964.
826 tristate "Applicom intelligent fieldbus card support"
829 This driver provides the kernel-side support for the intelligent
830 fieldbus cards made by Applicom International. More information
831 about these cards can be found on the WWW at the address
832 <http://www.applicom-int.com/>, or by email from David Woodhouse
833 <dwmw2@infradead.org>.
835 To compile this driver as a module, choose M here: the
836 module will be called applicom.
841 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
842 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
844 This driver enables access to the Sony Programmable I/O Control
845 Device which can be found in many (all ?) Sony Vaio laptops.
847 If you have one of those laptops, read
848 <file:Documentation/sonypi.txt>, and say Y or M here.
850 To compile this driver as a module, choose M here: the
851 module will be called sonypi.
854 tristate "TANBAC TB0219 base board support"
855 depends TANBAC_TB022X
858 menu "Ftape, the floppy tape device driver"
861 tristate "Ftape (QIC-80/Travan) support"
862 depends on BROKEN_ON_SMP && (ALPHA || X86)
864 If you have a tape drive that is connected to your floppy
865 controller, say Y here.
867 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
868 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
869 controller of their own. These drives (and their companion
870 controllers) are also supported if you say Y here.
872 If you have a special controller (such as the CMS FC-10, FC-20,
873 Mountain Mach-II, or any controller that is based on the Intel 82078
874 FDC like the high speed controllers by Seagate and Exabyte and
875 Iomega's "Ditto Dash") you must configure it by selecting the
876 appropriate entries from the "Floppy tape controllers" sub-menu
877 below and possibly modify the default values for the IRQ and DMA
878 channel and the IO base in ftape's configuration menu.
880 If you want to use your floppy tape drive on a PCI-bus based system,
881 please read the file <file:drivers/char/ftape/README.PCI>.
883 The ftape kernel driver is also available as a runtime loadable
884 module. To compile this driver as a module, choose M here: the
885 module will be called ftape.
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"
928 Give userspace access to the GPIO pins on the National
929 Semiconductor SCx200 processors.
931 If compiled as a module, it will be called scx200_gpio.
934 tristate "NatSemi PC8736x GPIO Support"
936 default SCx200_GPIO # mostly N
937 select NSC_GPIO # needed for support routines
939 Give userspace access to the GPIO pins on the National
940 Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
941 has multiple functional units, inc several managed by
942 hwmon/pc87360 driver. Tested with PC-87366
944 If compiled as a module, it will be called pc8736x_gpio.
947 tristate "NatSemi Base GPIO Support"
949 # selected by SCx200_GPIO and PC8736x_GPIO
950 # what about 2 selectors differing: m != y
952 Common support used (and needed) by scx200_gpio and
953 pc8736x_gpio drivers. If those drivers are built as
954 modules, this one will be too, named nsc_gpio
957 tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
960 Give userspace access to the GPIO pins on the AMD CS5535 and
961 CS5536 Geode companion devices.
963 If compiled as a module, it will be called cs5535_gpio.
966 tristate "NEC VR4100 series General-purpose I/O Unit support"
967 depends on CPU_VR41XX
970 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
973 The raw driver permits block devices to be bound to /dev/raw/rawN.
974 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
975 See the raw(8) manpage for more details.
977 The raw driver is deprecated and will be removed soon.
978 Applications should simply open the device (eg /dev/hda1)
979 with the O_DIRECT flag.
982 int "Maximum number of RAW devices to support (1-8192)"
983 depends on RAW_DRIVER
986 The maximum number of RAW devices that are supported.
987 Default is 256. Increase this number in case you need lots of
991 bool "HPET - High Precision Event Timer" if (X86 || IA64)
995 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
996 open selects one of the timers supported by the HPET. The timers are
997 non-periodic and/or periodic.
1000 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
1004 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
1005 is assumed the platform called hpet_alloc with the RTC IRQ values for
1009 bool "Allow mmap of HPET"
1013 If you say Y here, user applications will be able to mmap
1016 In some hardware implementations, the page containing HPET
1017 registers may also contain other things that shouldn't be
1018 exposed to the user. If this applies to your hardware,
1021 config HANGCHECK_TIMER
1022 tristate "Hangcheck timer"
1023 depends on X86 || IA64 || PPC64
1025 The hangcheck-timer module detects when the system has gone
1026 out to lunch past a certain margin. It can reboot the system
1027 or merely print a warning.
1030 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1031 depends on IA64_GENERIC || IA64_SGI_SN2
1034 The mmtimer device allows direct userspace access to the
1037 source "drivers/char/tpm/Kconfig"
1040 tristate "Telecom clock driver for MPBL0010 ATCA SBC"
1041 depends on EXPERIMENTAL && X86
1044 The telecom clock device is specific to the MPBL0010 ATCA computer and
1045 allows direct userspace access to the configuration of the telecom clock
1046 configuration settings. This device is used for hardware synchronization
1047 across the ATCA backplane fabric. Upon loading, the driver exports a
1048 sysfs directory, /sys/devices/platform/telco_clock, with a number of
1049 files for controlling the behavior of this hardware.
projects / linux-2.6 / blob