2 # Character device configuration
5 menu "Character devices"
8 bool "Virtual terminal" if EMBEDDED
12 If you say Y here, you will get support for terminal devices with
13 display and keyboard devices. These are called "virtual" because you
14 can run several virtual terminals (also called virtual consoles) on
15 one physical terminal. This is rather useful, for example one
16 virtual terminal can collect system messages and warnings, another
17 one can be used for a text-mode user session, and a third could run
18 an X session, all in parallel. Switching between virtual terminals
19 is done with certain key combinations, usually Alt-<function key>.
21 The setterm command ("man setterm") can be used to change the
22 properties (such as colors or beeping) of a virtual terminal. The
23 man page console_codes(4) ("man console_codes") contains the special
24 character sequences that can be used to change those properties
25 directly. The fonts used on virtual terminals can be changed with
26 the setfont ("man setfont") command and the key bindings are defined
27 with the loadkeys ("man loadkeys") command.
29 You need at least one virtual terminal device in order to make use
30 of your keyboard and monitor. Therefore, only people configuring an
31 embedded system would want to say N here in order to save some
32 memory; the only way to log into such a system is then via a serial
33 or network connection.
35 If unsure, say Y, or else you won't be able to do much with your new
36 shiny Linux system :-)
39 bool "Support for console on virtual terminal" if EMBEDDED
43 The system console is the device which receives all kernel messages
44 and warnings and which allows logins in single user mode. If you
45 answer Y here, a virtual terminal (the device used to interact with
46 a physical terminal) can be used as system console. This is the most
47 common mode of operations, so you should say Y here unless you want
48 the kernel messages be output only to a serial port (in which case
49 you should say Y to "Console on serial port", below).
51 If you do say Y here, by default the currently visible virtual
52 terminal (/dev/tty0) will be used as system console. You can change
53 that with a kernel command line option such as "console=tty3" which
54 would use the third virtual terminal as system console. (Try "man
55 bootparam" or see the documentation of your boot loader (lilo or
56 loadlin) about how to pass options to the kernel at boot time.)
62 depends on VT && !S390 && !UML
65 config SERIAL_NONSTANDARD
66 bool "Non-standard serial port support"
68 Say Y here if you have any non-standard serial boards -- boards
69 which aren't supported using the standard "dumb" serial driver.
70 This includes intelligent serial boards such as Cyclades,
71 Digiboards, etc. These are usually used for systems that need many
72 serial ports because they serve many terminals or dial-in
75 Note that the answer to this question won't directly affect the
76 kernel: saying N will just cause the configurator to skip all
77 the questions about non-standard serial boards.
79 Most people can say N here.
82 tristate "Computone IntelliPort Plus serial support"
83 depends on SERIAL_NONSTANDARD
85 This driver supports the entire family of Intelliport II/Plus
86 controllers with the exception of the MicroChannel controllers and
87 products previous to the Intelliport II. These are multiport cards,
88 which give you many serial ports. You would need something like this
89 to connect more than two modems to your Linux box, for instance in
90 order to become a dial-in server. If you have a card like that, say
91 Y here and read <file:Documentation/computone.txt>.
93 To compile this driver as modules, choose M here: the
94 modules will be called ip2 and ip2main.
97 tristate "Comtrol RocketPort support"
98 depends on SERIAL_NONSTANDARD
100 This driver supports Comtrol RocketPort and RocketModem PCI boards.
101 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
102 modems. For information about the RocketPort/RocketModem boards
103 and this driver read <file:Documentation/rocket.txt>.
105 To compile this driver as a module, choose M here: the
106 module will be called rocket.
108 If you want to compile this driver into the kernel, say Y here. If
109 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
112 tristate "Cyclades async mux support"
113 depends on SERIAL_NONSTANDARD
115 This driver supports Cyclades Z and Y multiserial boards.
116 You would need something like this to connect more than two modems to
117 your Linux box, for instance in order to become a dial-in server.
119 For information about the Cyclades-Z card, read
120 <file:drivers/char/README.cycladesZ>.
122 To compile this driver as a module, choose M here: the
123 module will be called cyclades.
125 If you haven't heard about it, it's safe to say N.
128 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
129 depends on EXPERIMENTAL && CYCLADES
131 The Cyclades-Z family of multiport cards allows 2 (two) driver op
132 modes: polling and interrupt. In polling mode, the driver will check
133 the status of the Cyclades-Z ports every certain amount of time
134 (which is called polling cycle and is configurable). In interrupt
135 mode, it will use an interrupt line (IRQ) in order to check the
136 status of the Cyclades-Z ports. The default op mode is polling. If
140 tristate "Digiboard Intelligent Async Support"
141 depends on SERIAL_NONSTANDARD
143 This is a driver for Digi International's Xx, Xeve, and Xem series
144 of cards which provide multiple serial ports. You would need
145 something like this to connect more than two modems to your Linux
146 box, for instance in order to become a dial-in server. This driver
147 supports the original PC (ISA) boards as well as PCI, and EISA. If
148 you have a card like this, say Y here and read the file
149 <file:Documentation/digiepca.txt>.
151 To compile this driver as a module, choose M here: the
152 module will be called epca.
155 tristate "Hayes ESP serial port support"
156 depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API
158 This is a driver which supports Hayes ESP serial ports. Both single
159 port cards and multiport cards are supported. Make sure to read
160 <file:Documentation/hayes-esp.txt>.
162 To compile this driver as a module, choose M here: the
163 module will be called esp.
168 tristate "Moxa Intellio support"
169 depends on SERIAL_NONSTANDARD
171 Say Y here if you have a Moxa Intellio multiport serial card.
173 To compile this driver as a module, choose M here: the
174 module will be called moxa.
177 tristate "Moxa SmartIO support"
178 depends on SERIAL_NONSTANDARD
180 Say Y here if you have a Moxa SmartIO multiport serial card.
182 This driver can also be built as a module ( = code which can be
183 inserted in and removed from the running kernel whenever you want).
184 The module will be called mxser. If you want to do that, say M
188 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
189 depends on SERIAL_NONSTANDARD
192 This is a driver for the Multi-Tech cards which provide several
193 serial ports. The driver is experimental and can currently only be
194 built as a module. The module will be called isicom.
195 If you want to do that, choose M here.
198 tristate "Microgate SyncLink card support"
199 depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
201 Provides support for the SyncLink ISA and PCI multiprotocol serial
202 adapters. These adapters support asynchronous and HDLC bit
203 synchronous communication up to 10Mbps (PCI adapter).
205 This driver can only be built as a module ( = code which can be
206 inserted in and removed from the running kernel whenever you want).
207 The module will be called synclink. If you want to do that, say M
211 tristate "SyncLink Multiport support"
212 depends on SERIAL_NONSTANDARD
214 Enable support for the SyncLink Multiport (2 or 4 ports)
215 serial adapter, running asynchronous and HDLC communications up
216 to 2.048Mbps. Each ports is independently selectable for
217 RS-232, V.35, RS-449, RS-530, and X.21
219 This driver may be built as a module ( = code which can be
220 inserted in and removed from the running kernel whenever you want).
221 The module will be called synclinkmp. If you want to do that, say M
225 tristate "SyncLink GT/AC support"
226 depends on SERIAL_NONSTANDARD && PCI
228 Support for SyncLink GT and SyncLink AC families of
229 synchronous and asynchronous serial adapters
230 manufactured by Microgate Systems, Ltd. (www.microgate.com)
233 tristate "HDLC line discipline support"
234 depends on SERIAL_NONSTANDARD
236 Allows synchronous HDLC communications with tty device drivers that
237 support synchronous HDLC such as the Microgate SyncLink adapter.
239 This driver can only be built as a module ( = code which can be
240 inserted in and removed from the running kernel whenever you want).
241 The module will be called n_hdlc. If you want to do that, say M
245 tristate "SDL RISCom/8 card support"
246 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
248 This is a driver for the SDL Communications RISCom/8 multiport card,
249 which gives you many serial ports. You would need something like
250 this to connect more than two modems to your Linux box, for instance
251 in order to become a dial-in server. If you have a card like that,
252 say Y here and read the file <file:Documentation/riscom8.txt>.
254 Also it's possible to say M here and compile this driver as kernel
255 loadable module; the module will be called riscom8.
258 tristate "Specialix IO8+ card support"
259 depends on SERIAL_NONSTANDARD
261 This is a driver for the Specialix IO8+ multiport card (both the
262 ISA and the PCI version) which gives you many serial ports. You
263 would need something like this to connect more than two modems to
264 your Linux box, for instance in order to become a dial-in server.
266 If you have a card like that, say Y here and read the file
267 <file:Documentation/specialix.txt>. Also it's possible to say M here
268 and compile this driver as kernel loadable module which will be
271 config SPECIALIX_RTSCTS
272 bool "Specialix DTR/RTS pin is RTS"
275 The Specialix IO8+ card can only support either RTS or DTR. If you
276 say N here, the driver will use the pin as "DTR" when the tty is in
277 software handshake mode. If you say Y here or hardware handshake is
278 on, it will always be RTS. Read the file
279 <file:Documentation/specialix.txt> for more information.
282 tristate "Specialix SX (and SI) card support"
283 depends on SERIAL_NONSTANDARD
285 This is a driver for the SX and SI multiport serial cards.
286 Please read the file <file:Documentation/sx.txt> for details.
288 This driver can only be built as a module ( = code which can be
289 inserted in and removed from the running kernel whenever you want).
290 The module will be called sx. If you want to do that, say M here.
293 tristate "Specialix RIO system support"
294 depends on SERIAL_NONSTANDARD
296 This is a driver for the Specialix RIO, a smart serial card which
297 drives an outboard box that can support up to 128 ports. Product
298 information is at <http://www.perle.com/support/documentation.html#multiport>.
299 There are both ISA and PCI versions.
302 bool "Support really old RIO/PCI cards"
305 Older RIO PCI cards need some initialization-time configuration to
306 determine the IRQ and some control addresses. If you have a RIO and
307 this doesn't seem to work, try setting this to Y.
310 bool "Stallion multiport serial support"
311 depends on SERIAL_NONSTANDARD
313 Stallion cards give you many serial ports. You would need something
314 like this to connect more than two modems to your Linux box, for
315 instance in order to become a dial-in server. If you say Y here,
316 you will be asked for your specific card model in the next
317 questions. Make sure to read <file:Documentation/stallion.txt> in
318 this case. If you have never heard about all this, it's safe to
322 tristate "Stallion EasyIO or EC8/32 support"
323 depends on STALDRV && BROKEN_ON_SMP
325 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
326 card, then this is for you; say Y. Make sure to read
327 <file:Documentation/stallion.txt>.
329 To compile this driver as a module, choose M here: the
330 module will be called stallion.
333 tristate "Stallion EC8/64, ONboard, Brumby support"
334 depends on STALDRV && BROKEN_ON_SMP
336 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
337 serial multiport card, say Y here. Make sure to read
338 <file:Documentation/stallion.txt>.
340 To compile this driver as a module, choose M here: the
341 module will be called istallion.
344 bool "Enable Au1000 UART Support"
345 depends on SERIAL_NONSTANDARD && MIPS
347 If you have an Alchemy AU1000 processor (MIPS based) and you want
348 to use serial ports, say Y. Otherwise, say N.
350 config AU1000_SERIAL_CONSOLE
351 bool "Enable Au1000 serial console"
352 depends on AU1000_UART
354 If you have an Alchemy AU1000 processor (MIPS based) and you want
355 to use a console on a serial port, say Y. Otherwise, say N.
357 config QTRONIX_KEYBOARD
358 bool "Enable Qtronix 990P Keyboard Support"
361 Images of Qtronix keyboards are at
362 <http://www.qtronix.com/keyboard.html>.
366 depends on QTRONIX_KEYBOARD
370 bool "Enable Smart Card Reader 0 Support "
373 Say Y here to support smart-card reader 0 (SCR0) on the Integrated
374 Technology Express, Inc. ITE8172 SBC. Vendor page at
375 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
376 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
379 bool "Enable Smart Card Reader 1 Support "
382 Say Y here to support smart-card reader 1 (SCR1) on the Integrated
383 Technology Express, Inc. ITE8172 SBC. Vendor page at
384 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
385 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
388 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
389 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
391 This option supports the 2232 7-port serial card shipped with the
392 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
393 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
394 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
395 ports were connected with 8 pin DIN connectors on the card bracket,
396 for which 8 pin to DB25 adapters were supplied. The card also had
397 jumpers internally to toggle various pinning configurations.
399 This driver can be built as a module; but then "generic_serial"
400 will also be built as a module. This has to be loaded before
401 "ser_a2232". If you want to do this, answer M here.
404 bool "SGI Altix system controller communication support"
405 depends on (IA64_SGI_SN2 || IA64_GENERIC)
407 If you have an SGI Altix and you want to enable system
408 controller communication from user space (you want this!),
409 say Y. Otherwise, say N.
412 bool "SGI TIO CX driver support"
413 depends on (IA64_SGI_SN2 || IA64_GENERIC)
415 If you have an SGI Altix and you have fpga devices attached
416 to your TIO, say Y here, otherwise say N.
419 tristate "SGI FPGA Core Services driver support"
422 If you have an SGI Altix with an attached SABrick
423 say Y or M here, otherwise say N.
425 source "drivers/serial/Kconfig"
428 bool "Unix98 PTY support" if EMBEDDED
431 A pseudo terminal (PTY) is a software device consisting of two
432 halves: a master and a slave. The slave device behaves identical to
433 a physical terminal; the master device is used by a process to
434 read data from and write data to the slave, thereby emulating a
435 terminal. Typical programs for the master side are telnet servers
438 Linux has traditionally used the BSD-like names /dev/ptyxx for
439 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
440 has a number of problems. The GNU C library glibc 2.1 and later,
441 however, supports the Unix98 naming standard: in order to acquire a
442 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
443 terminal is then made available to the process and the pseudo
444 terminal slave can be accessed as /dev/pts/<number>. What was
445 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
447 All modern Linux systems use the Unix98 ptys. Say Y unless
448 you're on an embedded system and want to conserve memory.
451 bool "Legacy (BSD) PTY support"
454 A pseudo terminal (PTY) is a software device consisting of two
455 halves: a master and a slave. The slave device behaves identical to
456 a physical terminal; the master device is used by a process to
457 read data from and write data to the slave, thereby emulating a
458 terminal. Typical programs for the master side are telnet servers
461 Linux has traditionally used the BSD-like names /dev/ptyxx
462 for masters and /dev/ttyxx for slaves of pseudo
463 terminals. This scheme has a number of problems, including
464 security. This option enables these legacy devices; on most
465 systems, it is safe to say N.
468 config LEGACY_PTY_COUNT
469 int "Maximum number of legacy PTY in use"
470 depends on LEGACY_PTYS
474 The maximum number of legacy PTYs that can be used at any one time.
475 The default is 256, and should be more than enough. Embedded
476 systems may want to reduce this to save memory.
478 When not in use, each legacy PTY occupies 12 bytes on 32-bit
479 architectures and 24 bytes on 64-bit architectures.
482 tristate "Parallel printer support"
485 If you intend to attach a printer to the parallel port of your Linux
486 box (as opposed to using a serial printer; if the connector at the
487 printer has 9 or 25 holes ["female"], then it's serial), say Y.
488 Also read the Printing-HOWTO, available from
489 <http://www.tldp.org/docs.html#howto>.
491 It is possible to share one parallel port among several devices
492 (e.g. printer and ZIP drive) and it is safe to compile the
493 corresponding drivers into the kernel.
495 To compile this driver as a module, choose M here and read
496 <file:Documentation/parport.txt>. The module will be called lp.
498 If you have several parallel ports, you can specify which ports to
499 use with the "lp" kernel command line option. (Try "man bootparam"
500 or see the documentation of your boot loader (lilo or loadlin) about
501 how to pass options to the kernel at boot time.) The syntax of the
502 "lp" command line option can be found in <file:drivers/char/lp.c>.
504 If you have more than 8 printers, you need to increase the LP_NO
505 macro in lp.c and the PARPORT_MAX macro in parport.h.
508 bool "Support for console on line printer"
511 If you want kernel messages to be printed out as they occur, you
512 can have a console on the printer. This option adds support for
513 doing that; to actually get it to happen you need to pass the
514 option "console=lp0" to the kernel at boot time.
516 If the printer is out of paper (or off, or unplugged, or too
517 busy..) the kernel will stall until the printer is ready again.
518 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
519 can make the kernel continue when this happens,
520 but it'll lose the kernel messages.
525 tristate "Support for user-space parallel port device drivers"
528 Saying Y to this adds support for /dev/parport device nodes. This
529 is needed for programs that want portable access to the parallel
530 port, for instance deviceid (which displays Plug-and-Play device
533 This is the parallel port equivalent of SCSI generic support (sg).
534 It is safe to say N to this -- it is not needed for normal printing
535 or parallel port CD-ROM/disk support.
537 To compile this driver as a module, choose M here: the
538 module will be called ppdev.
543 tristate "Texas Instruments parallel link cable support"
546 If you own a Texas Instruments graphing calculator and use a
547 parallel link cable, then you might be interested in this driver.
549 If you enable this driver, you will be able to communicate with
550 your calculator through a set of device nodes under /dev. The
551 main advantage of this driver is that you don't have to be root
552 to use this precise link cable (depending on the permissions on
553 the device nodes, though).
555 To compile this driver as a module, choose M here: the
556 module will be called tipar.
558 If you don't know what a parallel link cable is or what a Texas
559 Instruments graphing calculator is, then you probably don't need this
567 Users of pSeries machines that want to utilize the hvc console front-end
568 module for their backend console driver should select this option.
569 It will automatically be selected if one of the back-end console drivers
574 bool "pSeries Hypervisor Virtual Console support"
575 depends on PPC_PSERIES
578 pSeries machines when partitioned support a hypervisor virtual
579 console. This driver allows each pSeries partition to have a console
580 which is accessed via the HMC.
583 bool "IBM RTAS Console support"
587 IBM Console device driver which makes use of RTAS
590 tristate "IBM Hypervisor Virtual Console Server support"
591 depends on PPC_PSERIES
593 Partitionable IBM Power5 ppc64 machines allow hosting of
594 firmware virtual consoles from one Linux partition by
595 another Linux partition. This driver allows console data
596 from Linux partitions to be accessed through TTY device
597 interfaces in the device tree of a Linux partition running
600 To compile this driver as a module, choose M here: the
601 module will be called hvcs.ko. Additionally, this module
602 will depend on arch specific APIs exported from hvcserver.ko
603 which will also be compiled when this driver is built as a
606 source "drivers/char/ipmi/Kconfig"
608 source "drivers/char/watchdog/Kconfig"
611 tristate "NetWinder thermometer support"
612 depends on ARCH_NETWINDER
614 Say Y here to include support for the thermal management hardware
615 found in the NetWinder. This driver allows the user to control the
616 temperature set points and to read the current temperature.
618 It is also possible to say M here to build it as a module (ds1620)
619 It is recommended to be used on a NetWinder, but it is not a
623 tristate "NetWinder Button"
624 depends on ARCH_NETWINDER
626 If you say Y here and create a character device node /dev/nwbutton
627 with major and minor numbers 10 and 158 ("man mknod"), then every
628 time the orange button is pressed a number of times, the number of
629 times the button was pressed will be written to that device.
631 This is most useful for applications, as yet unwritten, which
632 perform actions based on how many times the button is pressed in a
635 Do not hold the button down for too long, as the driver does not
636 alter the behaviour of the hardware reset circuitry attached to the
637 button; it will still execute a hard reset if the button is held
638 down for longer than approximately five seconds.
640 To compile this driver as a module, choose M here: the
641 module will be called nwbutton.
643 Most people will answer Y to this question and "Reboot Using Button"
644 below to be able to initiate a system shutdown from the button.
646 config NWBUTTON_REBOOT
647 bool "Reboot Using Button"
650 If you say Y here, then you will be able to initiate a system
651 shutdown and reboot by pressing the orange button a number of times.
652 The number of presses to initiate the shutdown is two by default,
653 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
654 in nwbutton.h and recompiling the driver or, if you compile the
655 driver as a module, you can specify the number of presses at load
656 time with "insmod button reboot_count=<something>".
659 tristate "NetWinder flash support"
660 depends on ARCH_NETWINDER
662 If you say Y here and create a character device /dev/flash with
663 major 10 and minor 160 you can manipulate the flash ROM containing
664 the NetWinder firmware. Be careful as accidentally overwriting the
665 flash contents can render your computer unbootable. On no account
666 allow random users access to this device. :-)
668 To compile this driver as a module, choose M here: the
669 module will be called nwflash.
671 If you're not sure, say N.
674 tristate "Intel/AMD/VIA HW Random Number Generator support"
675 depends on (X86 || IA64) && PCI
677 This driver provides kernel-side support for the Random Number
678 Generator hardware found on Intel i8xx-based motherboards,
679 AMD 76x-based motherboards, and Via Nehemiah CPUs.
681 Provides a character driver, used to read() entropy data.
683 To compile this driver as a module, choose M here: the
684 module will be called hw_random.
689 tristate "/dev/nvram support"
690 depends on ATARI || X86 || ARM || GENERIC_NVRAM
692 If you say Y here and create a character special file /dev/nvram
693 with major number 10 and minor number 144 using mknod ("man mknod"),
694 you get read and write access to the extra bytes of non-volatile
695 memory in the real time clock (RTC), which is contained in every PC
696 and most Ataris. The actual number of bytes varies, depending on the
697 nvram in the system, but is usually 114 (128-14 for the RTC).
699 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
700 on Ataris. /dev/nvram may be used to view settings there, or to
701 change them (with some utility). It could also be used to frequently
702 save a few bits of very important data that may not be lost over
703 power-off and for which writing to disk is too insecure. Note
704 however that most NVRAM space in a PC belongs to the BIOS and you
705 should NEVER idly tamper with it. See Ralf Brown's interrupt list
706 for a guide to the use of CMOS bytes by your BIOS.
708 On Atari machines, /dev/nvram is always configured and does not need
711 To compile this driver as a module, choose M here: the
712 module will be called nvram.
715 tristate "Enhanced Real Time Clock Support"
716 depends on !PPC && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && !FRV && !ARM
718 If you say Y here and create a character special file /dev/rtc with
719 major number 10 and minor number 135 using mknod ("man mknod"), you
720 will get access to the real time clock (or hardware clock) built
723 Every PC has such a clock built in. It can be used to generate
724 signals from as low as 1Hz up to 8192Hz, and can also be used
725 as a 24 hour alarm. It reports status information via the file
726 /proc/driver/rtc and its behaviour is set by various ioctls on
729 If you run Linux on a multiprocessor machine and said Y to
730 "Symmetric Multi Processing" above, you should say Y here to read
731 and set the RTC in an SMP compatible fashion.
733 If you think you have a use for such a device (such as periodic data
734 sampling), then say Y here, and read <file:Documentation/rtc.txt>
737 To compile this driver as a module, choose M here: the
738 module will be called rtc.
741 tristate "SGI DS1286 RTC support"
744 If you say Y here and create a character special file /dev/rtc with
745 major number 10 and minor number 135 using mknod ("man mknod"), you
746 will get access to the real time clock built into your computer.
747 Every SGI has such a clock built in. It reports status information
748 via the file /proc/rtc and its behaviour is set by various ioctls on
752 bool "SGI M48T35 RTC support"
755 If you say Y here and create a character special file /dev/rtc with
756 major number 10 and minor number 135 using mknod ("man mknod"), you
757 will get access to the real time clock built into your computer.
758 Every SGI has such a clock built in. It reports status information
759 via the file /proc/rtc and its behaviour is set by various ioctls on
763 tristate "Generic /dev/rtc emulation"
764 depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV
766 If you say Y here and create a character special file /dev/rtc with
767 major number 10 and minor number 135 using mknod ("man mknod"), you
768 will get access to the real time clock (or hardware clock) built
771 It reports status information via the file /proc/driver/rtc and its
772 behaviour is set by various ioctls on /dev/rtc. If you enable the
773 "extended RTC operation" below it will also provide an emulation
774 for RTC_UIE which is required by some programs and may improve
775 precision in some cases.
777 To compile this driver as a module, choose M here: the
778 module will be called genrtc.
781 bool "Extended RTC operation"
784 Provides an emulation for RTC_UIE which is required by some programs
785 and may improve precision of the generic RTC support in some cases.
788 bool "EFI Real Time Clock Services"
792 tristate "DS1302 RTC support"
793 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
795 If you say Y here and create a character special file /dev/rtc with
796 major number 121 and minor number 0 using mknod ("man mknod"), you
797 will get access to the real time clock (or hardware clock) built
801 bool "S3C2410 RTC Driver"
802 depends on ARCH_S3C2410
804 RTC (Realtime Clock) driver for the clock inbuilt into the
805 Samsung S3C2410. This can provide periodic interrupt rates
806 from 1Hz to 64Hz for user programs, and wakeup from Alarm.
809 bool "Support for Cobalt LCD"
810 depends on MIPS_COBALT
812 This option enables support for the LCD display and buttons found
813 on Cobalt systems through a misc device.
816 tristate "Double Talk PC internal speech card support"
818 This driver is for the DoubleTalk PC, a speech synthesizer
819 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
820 called the `internal DoubleTalk'.
822 To compile this driver as a module, choose M here: the
823 module will be called dtlk.
826 tristate "Siemens R3964 line discipline"
828 This driver allows synchronous communication with devices using the
829 Siemens R3964 packet protocol. Unless you are dealing with special
830 hardware like PLCs, you are unlikely to need this.
832 To compile this driver as a module, choose M here: the
833 module will be called n_r3964.
838 tristate "Applicom intelligent fieldbus card support"
841 This driver provides the kernel-side support for the intelligent
842 fieldbus cards made by Applicom International. More information
843 about these cards can be found on the WWW at the address
844 <http://www.applicom-int.com/>, or by email from David Woodhouse
845 <dwmw2@infradead.org>.
847 To compile this driver as a module, choose M here: the
848 module will be called applicom.
853 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
854 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
856 This driver enables access to the Sony Programmable I/O Control
857 Device which can be found in many (all ?) Sony Vaio laptops.
859 If you have one of those laptops, read
860 <file:Documentation/sonypi.txt>, and say Y or M here.
862 To compile this driver as a module, choose M here: the
863 module will be called sonypi.
866 tristate "TANBAC TB0219 base board support"
867 depends TANBAC_TB022X
870 menu "Ftape, the floppy tape device driver"
873 tristate "Ftape (QIC-80/Travan) support"
874 depends on BROKEN_ON_SMP && (ALPHA || X86)
876 If you have a tape drive that is connected to your floppy
877 controller, say Y here.
879 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
880 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
881 controller of their own. These drives (and their companion
882 controllers) are also supported if you say Y here.
884 If you have a special controller (such as the CMS FC-10, FC-20,
885 Mountain Mach-II, or any controller that is based on the Intel 82078
886 FDC like the high speed controllers by Seagate and Exabyte and
887 Iomega's "Ditto Dash") you must configure it by selecting the
888 appropriate entries from the "Floppy tape controllers" sub-menu
889 below and possibly modify the default values for the IRQ and DMA
890 channel and the IO base in ftape's configuration menu.
892 If you want to use your floppy tape drive on a PCI-bus based system,
893 please read the file <file:drivers/char/ftape/README.PCI>.
895 The ftape kernel driver is also available as a runtime loadable
896 module. To compile this driver as a module, choose M here: the
897 module will be called ftape.
899 source "drivers/char/ftape/Kconfig"
903 source "drivers/char/agp/Kconfig"
905 source "drivers/char/drm/Kconfig"
907 source "drivers/char/pcmcia/Kconfig"
910 tristate "ACP Modem (Mwave) support"
914 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
915 kernel driver and a user level application. Together these components
916 support direct attachment to public switched telephone networks (PSTNs)
917 and support selected world wide countries.
919 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
920 600, and 770 that include on board ACP modem hardware.
922 The modem also supports the standard communications port interface
923 (ttySx) and is compatible with the Hayes AT Command Set.
925 The user level application needed to use this driver can be found at
926 the IBM Linux Technology Center (LTC) web site:
927 <http://www.ibm.com/linux/ltc/>.
929 If you own one of the above IBM Thinkpads which has the Mwave chipset
932 To compile this driver as a module, choose M here: the
933 module will be called mwave.
936 tristate "NatSemi SCx200 GPIO Support"
939 Give userspace access to the GPIO pins on the National
940 Semiconductor SCx200 processors.
942 If compiled as a module, it will be called scx200_gpio.
945 tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
948 Give userspace access to the GPIO pins on the AMD CS5535 and
949 CS5536 Geode companion devices.
951 If compiled as a module, it will be called cs5535_gpio.
954 tristate "NEC VR4100 series General-purpose I/O Unit support"
955 depends on CPU_VR41XX
958 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
960 The raw driver permits block devices to be bound to /dev/raw/rawN.
961 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
962 See the raw(8) manpage for more details.
964 The raw driver is deprecated and will be removed soon.
965 Applications should simply open the device (eg /dev/hda1)
966 with the O_DIRECT flag.
969 int "Maximum number of RAW devices to support (1-8192)"
970 depends on RAW_DRIVER
973 The maximum number of RAW devices that are supported.
974 Default is 256. Increase this number in case you need lots of
978 bool "HPET - High Precision Event Timer" if (X86 || IA64)
982 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
983 open selects one of the timers supported by the HPET. The timers are
984 non-periodioc and/or periodic.
987 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
991 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
992 is assumed the platform called hpet_alloc with the RTC IRQ values for
996 bool "Allow mmap of HPET"
1000 If you say Y here, user applications will be able to mmap
1003 In some hardware implementations, the page containing HPET
1004 registers may also contain other things that shouldn't be
1005 exposed to the user. If this applies to your hardware,
1008 config HANGCHECK_TIMER
1009 tristate "Hangcheck timer"
1010 depends on X86 || IA64 || PPC64
1012 The hangcheck-timer module detects when the system has gone
1013 out to lunch past a certain margin. It can reboot the system
1014 or merely print a warning.
1017 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1018 depends on IA64_GENERIC || IA64_SGI_SN2
1021 The mmtimer device allows direct userspace access to the
1024 source "drivers/char/tpm/Kconfig"
1027 tristate "Telecom clock driver for MPBL0010 ATCA SBC"
1028 depends on EXPERIMENTAL
1031 The telecom clock device is specific to the MPBL0010 ATCA computer and
1032 allows direct userspace access to the configuration of the telecom clock
1033 configuration settings. This device is used for hardware synchronization
1034 across the ATCA backplane fabric. Upon loading, the driver exports a
1035 sysfs directory, /sys/devices/platform/telco_clock, with a number of
1036 files for controlling the behavior of this hardware.
projects / linux-2.6 / blob