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.
374 config QTRONIX_KEYBOARD
375 bool "Enable Qtronix 990P Keyboard Support"
378 Images of Qtronix keyboards are at
379 <http://www.qtronix.com/keyboard.html>.
383 depends on QTRONIX_KEYBOARD
387 bool "Enable Smart Card Reader 0 Support "
390 Say Y here to support smart-card reader 0 (SCR0) on the Integrated
391 Technology Express, Inc. ITE8172 SBC. Vendor page at
392 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
393 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
396 bool "Enable Smart Card Reader 1 Support "
399 Say Y here to support smart-card reader 1 (SCR1) on the Integrated
400 Technology Express, Inc. ITE8172 SBC. Vendor page at
401 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
402 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
405 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
406 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
408 This option supports the 2232 7-port serial card shipped with the
409 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
410 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
411 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
412 ports were connected with 8 pin DIN connectors on the card bracket,
413 for which 8 pin to DB25 adapters were supplied. The card also had
414 jumpers internally to toggle various pinning configurations.
416 This driver can be built as a module; but then "generic_serial"
417 will also be built as a module. This has to be loaded before
418 "ser_a2232". If you want to do this, answer M here.
421 bool "SGI Altix system controller communication support"
422 depends on (IA64_SGI_SN2 || IA64_GENERIC)
424 If you have an SGI Altix and you want to enable system
425 controller communication from user space (you want this!),
426 say Y. Otherwise, say N.
429 bool "SGI TIO CX driver support"
430 depends on (IA64_SGI_SN2 || IA64_GENERIC)
432 If you have an SGI Altix and you have fpga devices attached
433 to your TIO, say Y here, otherwise say N.
436 tristate "SGI FPGA Core Services driver support"
439 If you have an SGI Altix with an attached SABrick
440 say Y or M here, otherwise say N.
443 tristate "Memory special operations driver"
446 If you have an ia64 and you want to enable memory special
447 operations support (formerly known as fetchop), say Y here,
450 source "drivers/serial/Kconfig"
453 bool "Unix98 PTY support" if EMBEDDED
456 A pseudo terminal (PTY) is a software device consisting of two
457 halves: a master and a slave. The slave device behaves identical to
458 a physical terminal; the master device is used by a process to
459 read data from and write data to the slave, thereby emulating a
460 terminal. Typical programs for the master side are telnet servers
463 Linux has traditionally used the BSD-like names /dev/ptyxx for
464 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
465 has a number of problems. The GNU C library glibc 2.1 and later,
466 however, supports the Unix98 naming standard: in order to acquire a
467 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
468 terminal is then made available to the process and the pseudo
469 terminal slave can be accessed as /dev/pts/<number>. What was
470 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
472 All modern Linux systems use the Unix98 ptys. Say Y unless
473 you're on an embedded system and want to conserve memory.
476 bool "Legacy (BSD) PTY support"
479 A pseudo terminal (PTY) is a software device consisting of two
480 halves: a master and a slave. The slave device behaves identical to
481 a physical terminal; the master device is used by a process to
482 read data from and write data to the slave, thereby emulating a
483 terminal. Typical programs for the master side are telnet servers
486 Linux has traditionally used the BSD-like names /dev/ptyxx
487 for masters and /dev/ttyxx for slaves of pseudo
488 terminals. This scheme has a number of problems, including
489 security. This option enables these legacy devices; on most
490 systems, it is safe to say N.
493 config LEGACY_PTY_COUNT
494 int "Maximum number of legacy PTY in use"
495 depends on LEGACY_PTYS
499 The maximum number of legacy PTYs that can be used at any one time.
500 The default is 256, and should be more than enough. Embedded
501 systems may want to reduce this to save memory.
503 When not in use, each legacy PTY occupies 12 bytes on 32-bit
504 architectures and 24 bytes on 64-bit architectures.
507 tristate 'Total Impact briQ front panel driver'
510 The briQ is a small footprint CHRP computer with a frontpanel VFD, a
511 tristate led and two switches. It is the size of a CDROM drive.
513 If you have such one and want anything showing on the VFD then you
516 To compile this driver as a module, choose M here: the
517 module will be called briq_panel.
519 It's safe to say N here.
522 tristate "Parallel printer support"
525 If you intend to attach a printer to the parallel port of your Linux
526 box (as opposed to using a serial printer; if the connector at the
527 printer has 9 or 25 holes ["female"], then it's serial), say Y.
528 Also read the Printing-HOWTO, available from
529 <http://www.tldp.org/docs.html#howto>.
531 It is possible to share one parallel port among several devices
532 (e.g. printer and ZIP drive) and it is safe to compile the
533 corresponding drivers into the kernel.
535 To compile this driver as a module, choose M here and read
536 <file:Documentation/parport.txt>. The module will be called lp.
538 If you have several parallel ports, you can specify which ports to
539 use with the "lp" kernel command line option. (Try "man bootparam"
540 or see the documentation of your boot loader (lilo or loadlin) about
541 how to pass options to the kernel at boot time.) The syntax of the
542 "lp" command line option can be found in <file:drivers/char/lp.c>.
544 If you have more than 8 printers, you need to increase the LP_NO
545 macro in lp.c and the PARPORT_MAX macro in parport.h.
548 bool "Support for console on line printer"
551 If you want kernel messages to be printed out as they occur, you
552 can have a console on the printer. This option adds support for
553 doing that; to actually get it to happen you need to pass the
554 option "console=lp0" to the kernel at boot time.
556 If the printer is out of paper (or off, or unplugged, or too
557 busy..) the kernel will stall until the printer is ready again.
558 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
559 can make the kernel continue when this happens,
560 but it'll lose the kernel messages.
565 tristate "Support for user-space parallel port device drivers"
568 Saying Y to this adds support for /dev/parport device nodes. This
569 is needed for programs that want portable access to the parallel
570 port, for instance deviceid (which displays Plug-and-Play device
573 This is the parallel port equivalent of SCSI generic support (sg).
574 It is safe to say N to this -- it is not needed for normal printing
575 or parallel port CD-ROM/disk support.
577 To compile this driver as a module, choose M here: the
578 module will be called ppdev.
583 tristate "Texas Instruments parallel link cable support"
586 If you own a Texas Instruments graphing calculator and use a
587 parallel link cable, then you might be interested in this driver.
589 If you enable this driver, you will be able to communicate with
590 your calculator through a set of device nodes under /dev. The
591 main advantage of this driver is that you don't have to be root
592 to use this precise link cable (depending on the permissions on
593 the device nodes, though).
595 To compile this driver as a module, choose M here: the
596 module will be called tipar.
598 If you don't know what a parallel link cable is or what a Texas
599 Instruments graphing calculator is, then you probably don't need this
607 Users of pSeries machines that want to utilize the hvc console front-end
608 module for their backend console driver should select this option.
609 It will automatically be selected if one of the back-end console drivers
614 bool "pSeries Hypervisor Virtual Console support"
615 depends on PPC_PSERIES
618 pSeries machines when partitioned support a hypervisor virtual
619 console. This driver allows each pSeries partition to have a console
620 which is accessed via the HMC.
623 bool "iSeries Hypervisor Virtual Console support"
624 depends on PPC_ISERIES && !VIOCONS
627 iSeries machines support a hypervisor virtual console.
630 bool "IBM RTAS Console support"
634 IBM Console device driver which makes use of RTAS
637 tristate "IBM Hypervisor Virtual Console Server support"
638 depends on PPC_PSERIES
640 Partitionable IBM Power5 ppc64 machines allow hosting of
641 firmware virtual consoles from one Linux partition by
642 another Linux partition. This driver allows console data
643 from Linux partitions to be accessed through TTY device
644 interfaces in the device tree of a Linux partition running
647 To compile this driver as a module, choose M here: the
648 module will be called hvcs.ko. Additionally, this module
649 will depend on arch specific APIs exported from hvcserver.ko
650 which will also be compiled when this driver is built as a
653 source "drivers/char/ipmi/Kconfig"
655 source "drivers/char/watchdog/Kconfig"
658 tristate "NetWinder thermometer support"
659 depends on ARCH_NETWINDER
661 Say Y here to include support for the thermal management hardware
662 found in the NetWinder. This driver allows the user to control the
663 temperature set points and to read the current temperature.
665 It is also possible to say M here to build it as a module (ds1620)
666 It is recommended to be used on a NetWinder, but it is not a
670 tristate "NetWinder Button"
671 depends on ARCH_NETWINDER
673 If you say Y here and create a character device node /dev/nwbutton
674 with major and minor numbers 10 and 158 ("man mknod"), then every
675 time the orange button is pressed a number of times, the number of
676 times the button was pressed will be written to that device.
678 This is most useful for applications, as yet unwritten, which
679 perform actions based on how many times the button is pressed in a
682 Do not hold the button down for too long, as the driver does not
683 alter the behaviour of the hardware reset circuitry attached to the
684 button; it will still execute a hard reset if the button is held
685 down for longer than approximately five seconds.
687 To compile this driver as a module, choose M here: the
688 module will be called nwbutton.
690 Most people will answer Y to this question and "Reboot Using Button"
691 below to be able to initiate a system shutdown from the button.
693 config NWBUTTON_REBOOT
694 bool "Reboot Using Button"
697 If you say Y here, then you will be able to initiate a system
698 shutdown and reboot by pressing the orange button a number of times.
699 The number of presses to initiate the shutdown is two by default,
700 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
701 in nwbutton.h and recompiling the driver or, if you compile the
702 driver as a module, you can specify the number of presses at load
703 time with "insmod button reboot_count=<something>".
706 tristate "NetWinder flash support"
707 depends on ARCH_NETWINDER
709 If you say Y here and create a character device /dev/flash with
710 major 10 and minor 160 you can manipulate the flash ROM containing
711 the NetWinder firmware. Be careful as accidentally overwriting the
712 flash contents can render your computer unbootable. On no account
713 allow random users access to this device. :-)
715 To compile this driver as a module, choose M here: the
716 module will be called nwflash.
718 If you're not sure, say N.
720 source "drivers/char/hw_random/Kconfig"
723 tristate "/dev/nvram support"
724 depends on ATARI || X86 || ARM || GENERIC_NVRAM
726 If you say Y here and create a character special file /dev/nvram
727 with major number 10 and minor number 144 using mknod ("man mknod"),
728 you get read and write access to the extra bytes of non-volatile
729 memory in the real time clock (RTC), which is contained in every PC
730 and most Ataris. The actual number of bytes varies, depending on the
731 nvram in the system, but is usually 114 (128-14 for the RTC).
733 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
734 on Ataris. /dev/nvram may be used to view settings there, or to
735 change them (with some utility). It could also be used to frequently
736 save a few bits of very important data that may not be lost over
737 power-off and for which writing to disk is too insecure. Note
738 however that most NVRAM space in a PC belongs to the BIOS and you
739 should NEVER idly tamper with it. See Ralf Brown's interrupt list
740 for a guide to the use of CMOS bytes by your BIOS.
742 On Atari machines, /dev/nvram is always configured and does not need
745 To compile this driver as a module, choose M here: the
746 module will be called nvram.
749 tristate "Enhanced Real Time Clock Support"
750 depends on !PPC && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && !FRV && !ARM && !SUPERH
752 If you say Y here and create a character special file /dev/rtc with
753 major number 10 and minor number 135 using mknod ("man mknod"), you
754 will get access to the real time clock (or hardware clock) built
757 Every PC has such a clock built in. It can be used to generate
758 signals from as low as 1Hz up to 8192Hz, and can also be used
759 as a 24 hour alarm. It reports status information via the file
760 /proc/driver/rtc and its behaviour is set by various ioctls on
763 If you run Linux on a multiprocessor machine and said Y to
764 "Symmetric Multi Processing" above, you should say Y here to read
765 and set the RTC in an SMP compatible fashion.
767 If you think you have a use for such a device (such as periodic data
768 sampling), then say Y here, and read <file:Documentation/rtc.txt>
771 To compile this driver as a module, choose M here: the
772 module will be called rtc.
775 tristate "SGI DS1286 RTC support"
778 If you say Y here and create a character special file /dev/rtc with
779 major number 10 and minor number 135 using mknod ("man mknod"), you
780 will get access to the real time clock built into your computer.
781 Every SGI has such a clock built in. It reports status information
782 via the file /proc/rtc and its behaviour is set by various ioctls on
786 bool "SGI M48T35 RTC support"
789 If you say Y here and create a character special file /dev/rtc with
790 major number 10 and minor number 135 using mknod ("man mknod"), you
791 will get access to the real time clock built into your computer.
792 Every SGI has such a clock built in. It reports status information
793 via the file /proc/rtc and its behaviour is set by various ioctls on
797 tristate "Generic /dev/rtc emulation"
798 depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV
800 If you say Y here and create a character special file /dev/rtc with
801 major number 10 and minor number 135 using mknod ("man mknod"), you
802 will get access to the real time clock (or hardware clock) built
805 It reports status information via the file /proc/driver/rtc and its
806 behaviour is set by various ioctls on /dev/rtc. If you enable the
807 "extended RTC operation" below it will also provide an emulation
808 for RTC_UIE which is required by some programs and may improve
809 precision in some cases.
811 To compile this driver as a module, choose M here: the
812 module will be called genrtc.
815 bool "Extended RTC operation"
818 Provides an emulation for RTC_UIE which is required by some programs
819 and may improve precision of the generic RTC support in some cases.
822 bool "EFI Real Time Clock Services"
826 tristate "DS1302 RTC support"
827 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
829 If you say Y here and create a character special file /dev/rtc with
830 major number 121 and minor number 0 using mknod ("man mknod"), you
831 will get access to the real time clock (or hardware clock) built
835 bool "S3C2410 RTC Driver"
836 depends on ARCH_S3C2410
838 RTC (Realtime Clock) driver for the clock inbuilt into the
839 Samsung S3C2410. This can provide periodic interrupt rates
840 from 1Hz to 64Hz for user programs, and wakeup from Alarm.
843 bool "Support for Cobalt LCD"
844 depends on MIPS_COBALT
846 This option enables support for the LCD display and buttons found
847 on Cobalt systems through a misc device.
850 tristate "Double Talk PC internal speech card support"
852 This driver is for the DoubleTalk PC, a speech synthesizer
853 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
854 called the `internal DoubleTalk'.
856 To compile this driver as a module, choose M here: the
857 module will be called dtlk.
860 tristate "Siemens R3964 line discipline"
862 This driver allows synchronous communication with devices using the
863 Siemens R3964 packet protocol. Unless you are dealing with special
864 hardware like PLCs, you are unlikely to need this.
866 To compile this driver as a module, choose M here: the
867 module will be called n_r3964.
872 tristate "Applicom intelligent fieldbus card support"
875 This driver provides the kernel-side support for the intelligent
876 fieldbus cards made by Applicom International. More information
877 about these cards can be found on the WWW at the address
878 <http://www.applicom-int.com/>, or by email from David Woodhouse
879 <dwmw2@infradead.org>.
881 To compile this driver as a module, choose M here: the
882 module will be called applicom.
887 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
888 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
890 This driver enables access to the Sony Programmable I/O Control
891 Device which can be found in many (all ?) Sony Vaio laptops.
893 If you have one of those laptops, read
894 <file:Documentation/sonypi.txt>, and say Y or M here.
896 To compile this driver as a module, choose M here: the
897 module will be called sonypi.
900 tristate "TANBAC TB0219 base board support"
901 depends TANBAC_TB022X
904 menu "Ftape, the floppy tape device driver"
907 tristate "Ftape (QIC-80/Travan) support"
908 depends on BROKEN_ON_SMP && (ALPHA || X86)
910 If you have a tape drive that is connected to your floppy
911 controller, say Y here.
913 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
914 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
915 controller of their own. These drives (and their companion
916 controllers) are also supported if you say Y here.
918 If you have a special controller (such as the CMS FC-10, FC-20,
919 Mountain Mach-II, or any controller that is based on the Intel 82078
920 FDC like the high speed controllers by Seagate and Exabyte and
921 Iomega's "Ditto Dash") you must configure it by selecting the
922 appropriate entries from the "Floppy tape controllers" sub-menu
923 below and possibly modify the default values for the IRQ and DMA
924 channel and the IO base in ftape's configuration menu.
926 If you want to use your floppy tape drive on a PCI-bus based system,
927 please read the file <file:drivers/char/ftape/README.PCI>.
929 The ftape kernel driver is also available as a runtime loadable
930 module. To compile this driver as a module, choose M here: the
931 module will be called ftape.
933 source "drivers/char/ftape/Kconfig"
937 source "drivers/char/agp/Kconfig"
939 source "drivers/char/drm/Kconfig"
941 source "drivers/char/pcmcia/Kconfig"
944 tristate "ACP Modem (Mwave) support"
948 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
949 kernel driver and a user level application. Together these components
950 support direct attachment to public switched telephone networks (PSTNs)
951 and support selected world wide countries.
953 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
954 600, and 770 that include on board ACP modem hardware.
956 The modem also supports the standard communications port interface
957 (ttySx) and is compatible with the Hayes AT Command Set.
959 The user level application needed to use this driver can be found at
960 the IBM Linux Technology Center (LTC) web site:
961 <http://www.ibm.com/linux/ltc/>.
963 If you own one of the above IBM Thinkpads which has the Mwave chipset
966 To compile this driver as a module, choose M here: the
967 module will be called mwave.
970 tristate "NatSemi SCx200 GPIO Support"
974 Give userspace access to the GPIO pins on the National
975 Semiconductor SCx200 processors.
977 If compiled as a module, it will be called scx200_gpio.
980 tristate "NatSemi PC8736x GPIO Support"
982 default SCx200_GPIO # mostly N
983 select NSC_GPIO # needed for support routines
985 Give userspace access to the GPIO pins on the National
986 Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
987 has multiple functional units, inc several managed by
988 hwmon/pc87360 driver. Tested with PC-87366
990 If compiled as a module, it will be called pc8736x_gpio.
993 tristate "NatSemi Base GPIO Support"
995 # selected by SCx200_GPIO and PC8736x_GPIO
996 # what about 2 selectors differing: m != y
998 Common support used (and needed) by scx200_gpio and
999 pc8736x_gpio drivers. If those drivers are built as
1000 modules, this one will be too, named nsc_gpio
1003 tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
1006 Give userspace access to the GPIO pins on the AMD CS5535 and
1007 CS5536 Geode companion devices.
1009 If compiled as a module, it will be called cs5535_gpio.
1012 tristate "NEC VR4100 series General-purpose I/O Unit support"
1013 depends on CPU_VR41XX
1016 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
1018 The raw driver permits block devices to be bound to /dev/raw/rawN.
1019 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
1020 See the raw(8) manpage for more details.
1022 The raw driver is deprecated and will be removed soon.
1023 Applications should simply open the device (eg /dev/hda1)
1024 with the O_DIRECT flag.
1027 int "Maximum number of RAW devices to support (1-8192)"
1028 depends on RAW_DRIVER
1031 The maximum number of RAW devices that are supported.
1032 Default is 256. Increase this number in case you need lots of
1036 bool "HPET - High Precision Event Timer" if (X86 || IA64)
1040 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
1041 open selects one of the timers supported by the HPET. The timers are
1042 non-periodioc and/or periodic.
1045 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
1049 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
1050 is assumed the platform called hpet_alloc with the RTC IRQ values for
1054 bool "Allow mmap of HPET"
1058 If you say Y here, user applications will be able to mmap
1061 In some hardware implementations, the page containing HPET
1062 registers may also contain other things that shouldn't be
1063 exposed to the user. If this applies to your hardware,
1066 config HANGCHECK_TIMER
1067 tristate "Hangcheck timer"
1068 depends on X86 || IA64 || PPC64
1070 The hangcheck-timer module detects when the system has gone
1071 out to lunch past a certain margin. It can reboot the system
1072 or merely print a warning.
1075 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1076 depends on IA64_GENERIC || IA64_SGI_SN2
1079 The mmtimer device allows direct userspace access to the
1082 source "drivers/char/tpm/Kconfig"
1085 tristate "Telecom clock driver for MPBL0010 ATCA SBC"
1086 depends on EXPERIMENTAL
1089 The telecom clock device is specific to the MPBL0010 ATCA computer and
1090 allows direct userspace access to the configuration of the telecom clock
1091 configuration settings. This device is used for hardware synchronization
1092 across the ATCA backplane fabric. Upon loading, the driver exports a
1093 sysfs directory, /sys/devices/platform/telco_clock, with a number of
1094 files for controlling the behavior of this hardware.
projects / linux-2.6 / blob