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 && !64BIT
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
565 bool "pSeries Hypervisor Virtual Console support"
566 depends on PPC_PSERIES
568 pSeries machines when partitioned support a hypervisor virtual
569 console. This driver allows each pSeries partition to have a console
570 which is accessed via the HMC.
573 tristate "IBM Hypervisor Virtual Console Server support"
574 depends on PPC_PSERIES
576 Partitionable IBM Power5 ppc64 machines allow hosting of
577 firmware virtual consoles from one Linux partition by
578 another Linux partition. This driver allows console data
579 from Linux partitions to be accessed through TTY device
580 interfaces in the device tree of a Linux partition running
583 To compile this driver as a module, choose M here: the
584 module will be called hvcs.ko. Additionally, this module
585 will depend on arch specific APIs exported from hvcserver.ko
586 which will also be compiled when this driver is built as a
589 source "drivers/char/ipmi/Kconfig"
591 source "drivers/char/watchdog/Kconfig"
594 tristate "NetWinder thermometer support"
595 depends on ARCH_NETWINDER
597 Say Y here to include support for the thermal management hardware
598 found in the NetWinder. This driver allows the user to control the
599 temperature set points and to read the current temperature.
601 It is also possible to say M here to build it as a module (ds1620)
602 It is recommended to be used on a NetWinder, but it is not a
606 tristate "NetWinder Button"
607 depends on ARCH_NETWINDER
609 If you say Y here and create a character device node /dev/nwbutton
610 with major and minor numbers 10 and 158 ("man mknod"), then every
611 time the orange button is pressed a number of times, the number of
612 times the button was pressed will be written to that device.
614 This is most useful for applications, as yet unwritten, which
615 perform actions based on how many times the button is pressed in a
618 Do not hold the button down for too long, as the driver does not
619 alter the behaviour of the hardware reset circuitry attached to the
620 button; it will still execute a hard reset if the button is held
621 down for longer than approximately five seconds.
623 To compile this driver as a module, choose M here: the
624 module will be called nwbutton.
626 Most people will answer Y to this question and "Reboot Using Button"
627 below to be able to initiate a system shutdown from the button.
629 config NWBUTTON_REBOOT
630 bool "Reboot Using Button"
633 If you say Y here, then you will be able to initiate a system
634 shutdown and reboot by pressing the orange button a number of times.
635 The number of presses to initiate the shutdown is two by default,
636 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
637 in nwbutton.h and recompiling the driver or, if you compile the
638 driver as a module, you can specify the number of presses at load
639 time with "insmod button reboot_count=<something>".
642 tristate "NetWinder flash support"
643 depends on ARCH_NETWINDER
645 If you say Y here and create a character device /dev/flash with
646 major 10 and minor 160 you can manipulate the flash ROM containing
647 the NetWinder firmware. Be careful as accidentally overwriting the
648 flash contents can render your computer unbootable. On no account
649 allow random users access to this device. :-)
651 To compile this driver as a module, choose M here: the
652 module will be called nwflash.
654 If you're not sure, say N.
657 tristate "Intel/AMD/VIA HW Random Number Generator support"
658 depends on (X86 || IA64) && PCI
660 This driver provides kernel-side support for the Random Number
661 Generator hardware found on Intel i8xx-based motherboards,
662 AMD 76x-based motherboards, and Via Nehemiah CPUs.
664 Provides a character driver, used to read() entropy data.
666 To compile this driver as a module, choose M here: the
667 module will be called hw_random.
672 tristate "/dev/nvram support"
673 depends on ATARI || X86 || ARM || GENERIC_NVRAM
675 If you say Y here and create a character special file /dev/nvram
676 with major number 10 and minor number 144 using mknod ("man mknod"),
677 you get read and write access to the extra bytes of non-volatile
678 memory in the real time clock (RTC), which is contained in every PC
679 and most Ataris. The actual number of bytes varies, depending on the
680 nvram in the system, but is usually 114 (128-14 for the RTC).
682 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
683 on Ataris. /dev/nvram may be used to view settings there, or to
684 change them (with some utility). It could also be used to frequently
685 save a few bits of very important data that may not be lost over
686 power-off and for which writing to disk is too insecure. Note
687 however that most NVRAM space in a PC belongs to the BIOS and you
688 should NEVER idly tamper with it. See Ralf Brown's interrupt list
689 for a guide to the use of CMOS bytes by your BIOS.
691 On Atari machines, /dev/nvram is always configured and does not need
694 To compile this driver as a module, choose M here: the
695 module will be called nvram.
698 tristate "Enhanced Real Time Clock Support"
699 depends on !PPC && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && !FRV && !ARM
701 If you say Y here and create a character special file /dev/rtc with
702 major number 10 and minor number 135 using mknod ("man mknod"), you
703 will get access to the real time clock (or hardware clock) built
706 Every PC has such a clock built in. It can be used to generate
707 signals from as low as 1Hz up to 8192Hz, and can also be used
708 as a 24 hour alarm. It reports status information via the file
709 /proc/driver/rtc and its behaviour is set by various ioctls on
712 If you run Linux on a multiprocessor machine and said Y to
713 "Symmetric Multi Processing" above, you should say Y here to read
714 and set the RTC in an SMP compatible fashion.
716 If you think you have a use for such a device (such as periodic data
717 sampling), then say Y here, and read <file:Documentation/rtc.txt>
720 To compile this driver as a module, choose M here: the
721 module will be called rtc.
724 tristate "SGI DS1286 RTC support"
727 If you say Y here and create a character special file /dev/rtc with
728 major number 10 and minor number 135 using mknod ("man mknod"), you
729 will get access to the real time clock built into your computer.
730 Every SGI has such a clock built in. It reports status information
731 via the file /proc/rtc and its behaviour is set by various ioctls on
735 bool "SGI M48T35 RTC support"
738 If you say Y here and create a character special file /dev/rtc with
739 major number 10 and minor number 135 using mknod ("man mknod"), you
740 will get access to the real time clock built into your computer.
741 Every SGI has such a clock built in. It reports status information
742 via the file /proc/rtc and its behaviour is set by various ioctls on
746 tristate "Generic /dev/rtc emulation"
747 depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV
749 If you say Y here and create a character special file /dev/rtc with
750 major number 10 and minor number 135 using mknod ("man mknod"), you
751 will get access to the real time clock (or hardware clock) built
754 It reports status information via the file /proc/driver/rtc and its
755 behaviour is set by various ioctls on /dev/rtc. If you enable the
756 "extended RTC operation" below it will also provide an emulation
757 for RTC_UIE which is required by some programs and may improve
758 precision in some cases.
760 To compile this driver as a module, choose M here: the
761 module will be called genrtc.
764 bool "Extended RTC operation"
767 Provides an emulation for RTC_UIE which is required by some programs
768 and may improve precision of the generic RTC support in some cases.
771 bool "EFI Real Time Clock Services"
775 tristate "DS1302 RTC support"
776 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
778 If you say Y here and create a character special file /dev/rtc with
779 major number 121 and minor number 0 using mknod ("man mknod"), you
780 will get access to the real time clock (or hardware clock) built
784 bool "S3C2410 RTC Driver"
785 depends on ARCH_S3C2410
787 RTC (Realtime Clock) driver for the clock inbuilt into the
788 Samsung S3C2410. This can provide periodic interrupt rates
789 from 1Hz to 64Hz for user programs, and wakeup from Alarm.
792 tristate "NEC VR4100 series Real Time Clock Support"
793 depends on CPU_VR41XX
796 bool "Support for Cobalt LCD"
797 depends on MIPS_COBALT
799 This option enables support for the LCD display and buttons found
800 on Cobalt systems through a misc device.
803 tristate "Double Talk PC internal speech card support"
805 This driver is for the DoubleTalk PC, a speech synthesizer
806 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
807 called the `internal DoubleTalk'.
809 To compile this driver as a module, choose M here: the
810 module will be called dtlk.
813 tristate "Siemens R3964 line discipline"
815 This driver allows synchronous communication with devices using the
816 Siemens R3964 packet protocol. Unless you are dealing with special
817 hardware like PLCs, you are unlikely to need this.
819 To compile this driver as a module, choose M here: the
820 module will be called n_r3964.
825 tristate "Applicom intelligent fieldbus card support"
828 This driver provides the kernel-side support for the intelligent
829 fieldbus cards made by Applicom International. More information
830 about these cards can be found on the WWW at the address
831 <http://www.applicom-int.com/>, or by email from David Woodhouse
832 <dwmw2@infradead.org>.
834 To compile this driver as a module, choose M here: the
835 module will be called applicom.
840 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
841 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
843 This driver enables access to the Sony Programmable I/O Control
844 Device which can be found in many (all ?) Sony Vaio laptops.
846 If you have one of those laptops, read
847 <file:Documentation/sonypi.txt>, and say Y or M here.
849 To compile this driver as a module, choose M here: the
850 module will be called sonypi.
853 tristate "TANBAC TB0219 base board support"
854 depends TANBAC_TB022X
856 menu "Ftape, the floppy tape device driver"
859 tristate "Ftape (QIC-80/Travan) support"
860 depends on BROKEN_ON_SMP && (ALPHA || X86)
862 If you have a tape drive that is connected to your floppy
863 controller, say Y here.
865 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
866 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
867 controller of their own. These drives (and their companion
868 controllers) are also supported if you say Y here.
870 If you have a special controller (such as the CMS FC-10, FC-20,
871 Mountain Mach-II, or any controller that is based on the Intel 82078
872 FDC like the high speed controllers by Seagate and Exabyte and
873 Iomega's "Ditto Dash") you must configure it by selecting the
874 appropriate entries from the "Floppy tape controllers" sub-menu
875 below and possibly modify the default values for the IRQ and DMA
876 channel and the IO base in ftape's configuration menu.
878 If you want to use your floppy tape drive on a PCI-bus based system,
879 please read the file <file:drivers/char/ftape/README.PCI>.
881 The ftape kernel driver is also available as a runtime loadable
882 module. To compile this driver as a module, choose M here: the
883 module will be called ftape.
885 source "drivers/char/ftape/Kconfig"
889 source "drivers/char/agp/Kconfig"
891 source "drivers/char/drm/Kconfig"
893 source "drivers/char/pcmcia/Kconfig"
896 tristate "ACP Modem (Mwave) support"
900 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
901 kernel driver and a user level application. Together these components
902 support direct attachment to public switched telephone networks (PSTNs)
903 and support selected world wide countries.
905 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
906 600, and 770 that include on board ACP modem hardware.
908 The modem also supports the standard communications port interface
909 (ttySx) and is compatible with the Hayes AT Command Set.
911 The user level application needed to use this driver can be found at
912 the IBM Linux Technology Center (LTC) web site:
913 <http://www.ibm.com/linux/ltc/>.
915 If you own one of the above IBM Thinkpads which has the Mwave chipset
918 To compile this driver as a module, choose M here: the
919 module will be called mwave.
922 tristate "NatSemi SCx200 GPIO Support"
925 Give userspace access to the GPIO pins on the National
926 Semiconductor SCx200 processors.
928 If compiled as a module, it will be called scx200_gpio.
931 tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
934 Give userspace access to the GPIO pins on the AMD CS5535 and
935 CS5536 Geode companion devices.
937 If compiled as a module, it will be called cs5535_gpio.
940 tristate "NEC VR4100 series General-purpose I/O Unit support"
941 depends on CPU_VR41XX
944 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
946 The raw driver permits block devices to be bound to /dev/raw/rawN.
947 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
948 See the raw(8) manpage for more details.
950 The raw driver is deprecated and will be removed soon.
951 Applications should simply open the device (eg /dev/hda1)
952 with the O_DIRECT flag.
955 int "Maximum number of RAW devices to support (1-8192)"
956 depends on RAW_DRIVER
959 The maximum number of RAW devices that are supported.
960 Default is 256. Increase this number in case you need lots of
964 bool "HPET - High Precision Event Timer" if (X86 || IA64)
968 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
969 open selects one of the timers supported by the HPET. The timers are
970 non-periodioc and/or periodic.
973 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
977 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
978 is assumed the platform called hpet_alloc with the RTC IRQ values for
982 bool "Allow mmap of HPET"
986 If you say Y here, user applications will be able to mmap
989 In some hardware implementations, the page containing HPET
990 registers may also contain other things that shouldn't be
991 exposed to the user. If this applies to your hardware,
994 config HANGCHECK_TIMER
995 tristate "Hangcheck timer"
996 depends on X86 || IA64 || PPC64
998 The hangcheck-timer module detects when the system has gone
999 out to lunch past a certain margin. It can reboot the system
1000 or merely print a warning.
1003 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1004 depends on IA64_GENERIC || IA64_SGI_SN2
1007 The mmtimer device allows direct userspace access to the
1010 source "drivers/char/tpm/Kconfig"
1013 tristate "Telecom clock driver for MPBL0010 ATCA SBC"
1014 depends on EXPERIMENTAL
1017 The telecom clock device is specific to the MPBL0010 ATCA computer and
1018 allows direct userspace access to the configuration of the telecom clock
1019 configuration settings. This device is used for hardware synchronization
1020 across the ATCA backplane fabric. Upon loading, the driver exports a
1021 sysfs directory, /sys/devices/platform/telco_clock, with a number of
1022 files for controlling the behavior of this hardware.
projects / linux-2.6 / blob