2 # Character device configuration
5 menu "Character devices"
8 bool "Virtual terminal" if EMBEDDED
13 If you say Y here, you will get support for terminal devices with
14 display and keyboard devices. These are called "virtual" because you
15 can run several virtual terminals (also called virtual consoles) on
16 one physical terminal. This is rather useful, for example one
17 virtual terminal can collect system messages and warnings, another
18 one can be used for a text-mode user session, and a third could run
19 an X session, all in parallel. Switching between virtual terminals
20 is done with certain key combinations, usually Alt-<function key>.
22 The setterm command ("man setterm") can be used to change the
23 properties (such as colors or beeping) of a virtual terminal. The
24 man page console_codes(4) ("man console_codes") contains the special
25 character sequences that can be used to change those properties
26 directly. The fonts used on virtual terminals can be changed with
27 the setfont ("man setfont") command and the key bindings are defined
28 with the loadkeys ("man loadkeys") command.
30 You need at least one virtual terminal device in order to make use
31 of your keyboard and monitor. Therefore, only people configuring an
32 embedded system would want to say N here in order to save some
33 memory; the only way to log into such a system is then via a serial
34 or network connection.
36 If unsure, say Y, or else you won't be able to do much with your new
37 shiny Linux system :-)
40 bool "Support for console on virtual terminal" if EMBEDDED
44 The system console is the device which receives all kernel messages
45 and warnings and which allows logins in single user mode. If you
46 answer Y here, a virtual terminal (the device used to interact with
47 a physical terminal) can be used as system console. This is the most
48 common mode of operations, so you should say Y here unless you want
49 the kernel messages be output only to a serial port (in which case
50 you should say Y to "Console on serial port", below).
52 If you do say Y here, by default the currently visible virtual
53 terminal (/dev/tty0) will be used as system console. You can change
54 that with a kernel command line option such as "console=tty3" which
55 would use the third virtual terminal as system console. (Try "man
56 bootparam" or see the documentation of your boot loader (lilo or
57 loadlin) about how to pass options to the kernel at boot time.)
63 depends on VT && !S390 && !UML
66 config VT_HW_CONSOLE_BINDING
67 bool "Support for binding and unbinding console drivers"
71 The virtual terminal is the device that interacts with the physical
72 terminal through console drivers. On these systems, at least one
73 console driver is loaded. In other configurations, additional console
74 drivers may be enabled, such as the framebuffer console. If more than
75 1 console driver is enabled, setting this to 'y' will allow you to
76 select the console driver that will serve as the backend for the
79 See <file:Documentation/console/console.txt> for more
80 information. For framebuffer console users, please refer to
81 <file:Documentation/fb/fbcon.txt>.
84 bool "/dev/kmem virtual device support"
87 Say Y here if you want to support the /dev/kmem device. The
88 /dev/kmem device is rarely used, but can be used for certain
89 kind of kernel debugging operations.
90 When in doubt, say "N".
92 config SERIAL_NONSTANDARD
93 bool "Non-standard serial port support"
96 Say Y here if you have any non-standard serial boards -- boards
97 which aren't supported using the standard "dumb" serial driver.
98 This includes intelligent serial boards such as Cyclades,
99 Digiboards, etc. These are usually used for systems that need many
100 serial ports because they serve many terminals or dial-in
103 Note that the answer to this question won't directly affect the
104 kernel: saying N will just cause the configurator to skip all
105 the questions about non-standard serial boards.
107 Most people can say N here.
110 tristate "Computone IntelliPort Plus serial support"
111 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
113 This driver supports the entire family of Intelliport II/Plus
114 controllers with the exception of the MicroChannel controllers and
115 products previous to the Intelliport II. These are multiport cards,
116 which give you many serial ports. You would need something like this
117 to connect more than two modems to your Linux box, for instance in
118 order to become a dial-in server. If you have a card like that, say
119 Y here and read <file:Documentation/computone.txt>.
121 To compile this driver as module, choose M here: the
122 module will be called ip2.
125 tristate "Comtrol RocketPort support"
126 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
128 This driver supports Comtrol RocketPort and RocketModem PCI boards.
129 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
130 modems. For information about the RocketPort/RocketModem boards
131 and this driver read <file:Documentation/rocket.txt>.
133 To compile this driver as a module, choose M here: the
134 module will be called rocket.
136 If you want to compile this driver into the kernel, say Y here. If
137 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
140 tristate "Cyclades async mux support"
141 depends on SERIAL_NONSTANDARD && (PCI || ISA)
144 This driver supports Cyclades Z and Y multiserial boards.
145 You would need something like this to connect more than two modems to
146 your Linux box, for instance in order to become a dial-in server.
148 For information about the Cyclades-Z card, read
149 <file:Documentation/README.cycladesZ>.
151 To compile this driver as a module, choose M here: the
152 module will be called cyclades.
154 If you haven't heard about it, it's safe to say N.
157 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
158 depends on EXPERIMENTAL && CYCLADES
160 The Cyclades-Z family of multiport cards allows 2 (two) driver op
161 modes: polling and interrupt. In polling mode, the driver will check
162 the status of the Cyclades-Z ports every certain amount of time
163 (which is called polling cycle and is configurable). In interrupt
164 mode, it will use an interrupt line (IRQ) in order to check the
165 status of the Cyclades-Z ports. The default op mode is polling. If
169 tristate "Digiboard Intelligent Async Support"
170 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
172 This is a driver for Digi International's Xx, Xeve, and Xem series
173 of cards which provide multiple serial ports. You would need
174 something like this to connect more than two modems to your Linux
175 box, for instance in order to become a dial-in server. This driver
176 supports the original PC (ISA) boards as well as PCI, and EISA. If
177 you have a card like this, say Y here and read the file
178 <file:Documentation/digiepca.txt>.
180 To compile this driver as a module, choose M here: the
181 module will be called epca.
184 tristate "Hayes ESP serial port support"
185 depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API
187 This is a driver which supports Hayes ESP serial ports. Both single
188 port cards and multiport cards are supported. Make sure to read
189 <file:Documentation/hayes-esp.txt>.
191 To compile this driver as a module, choose M here: the
192 module will be called esp.
197 tristate "Moxa Intellio support"
198 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
201 Say Y here if you have a Moxa Intellio multiport serial card.
203 To compile this driver as a module, choose M here: the
204 module will be called moxa.
207 tristate "Moxa SmartIO support v. 2.0"
208 depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
210 Say Y here if you have a Moxa SmartIO multiport serial card and/or
211 want to help develop a new version of this driver.
213 This is upgraded (1.9.1) driver from original Moxa drivers with
214 changes finally resulting in PCI probing.
216 This driver can also be built as a module. The module will be called
217 mxser. If you want to do that, say M here.
220 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
221 depends on SERIAL_NONSTANDARD && PCI
224 This is a driver for the Multi-Tech cards which provide several
225 serial ports. The driver is experimental and can currently only be
226 built as a module. The module will be called isicom.
227 If you want to do that, choose M here.
230 tristate "Microgate SyncLink card support"
231 depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
233 Provides support for the SyncLink ISA and PCI multiprotocol serial
234 adapters. These adapters support asynchronous and HDLC bit
235 synchronous communication up to 10Mbps (PCI adapter).
237 This driver can only be built as a module ( = code which can be
238 inserted in and removed from the running kernel whenever you want).
239 The module will be called synclink. If you want to do that, say M
243 tristate "SyncLink Multiport support"
244 depends on SERIAL_NONSTANDARD && PCI
246 Enable support for the SyncLink Multiport (2 or 4 ports)
247 serial adapter, running asynchronous and HDLC communications up
248 to 2.048Mbps. Each ports is independently selectable for
249 RS-232, V.35, RS-449, RS-530, and X.21
251 This driver may be built as a module ( = code which can be
252 inserted in and removed from the running kernel whenever you want).
253 The module will be called synclinkmp. If you want to do that, say M
257 tristate "SyncLink GT/AC support"
258 depends on SERIAL_NONSTANDARD && PCI
260 Support for SyncLink GT and SyncLink AC families of
261 synchronous and asynchronous serial adapters
262 manufactured by Microgate Systems, Ltd. (www.microgate.com)
265 tristate "HDLC line discipline support"
266 depends on SERIAL_NONSTANDARD
268 Allows synchronous HDLC communications with tty device drivers that
269 support synchronous HDLC such as the Microgate SyncLink adapter.
271 This driver can only be built as a module ( = code which can be
272 inserted in and removed from the running kernel whenever you want).
273 The module will be called n_hdlc. If you want to do that, say M
277 tristate "SDL RISCom/8 card support"
278 depends on SERIAL_NONSTANDARD
280 This is a driver for the SDL Communications RISCom/8 multiport card,
281 which gives you many serial ports. You would need something like
282 this to connect more than two modems to your Linux box, for instance
283 in order to become a dial-in server. If you have a card like that,
284 say Y here and read the file <file:Documentation/riscom8.txt>.
286 Also it's possible to say M here and compile this driver as kernel
287 loadable module; the module will be called riscom8.
290 tristate "Specialix IO8+ card support"
291 depends on SERIAL_NONSTANDARD && BROKEN
293 This is a driver for the Specialix IO8+ multiport card (both the
294 ISA and the PCI version) which gives you many serial ports. You
295 would need something like this to connect more than two modems to
296 your Linux box, for instance in order to become a dial-in server.
298 If you have a card like that, say Y here and read the file
299 <file:Documentation/specialix.txt>. Also it's possible to say M here
300 and compile this driver as kernel loadable module which will be
304 tristate "Specialix SX (and SI) card support"
305 depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
307 This is a driver for the SX and SI multiport serial cards.
308 Please read the file <file:Documentation/sx.txt> for details.
310 This driver can only be built as a module ( = code which can be
311 inserted in and removed from the running kernel whenever you want).
312 The module will be called sx. If you want to do that, say M here.
315 tristate "Specialix RIO system support"
316 depends on SERIAL_NONSTANDARD
318 This is a driver for the Specialix RIO, a smart serial card which
319 drives an outboard box that can support up to 128 ports. Product
320 information is at <http://www.perle.com/support/documentation.html#multiport>.
321 There are both ISA and PCI versions.
324 bool "Support really old RIO/PCI cards"
327 Older RIO PCI cards need some initialization-time configuration to
328 determine the IRQ and some control addresses. If you have a RIO and
329 this doesn't seem to work, try setting this to Y.
332 bool "Stallion multiport serial support"
333 depends on SERIAL_NONSTANDARD
335 Stallion cards give you many serial ports. You would need something
336 like this to connect more than two modems to your Linux box, for
337 instance in order to become a dial-in server. If you say Y here,
338 you will be asked for your specific card model in the next
339 questions. Make sure to read <file:Documentation/stallion.txt> in
340 this case. If you have never heard about all this, it's safe to
344 tristate "Stallion EasyIO or EC8/32 support"
345 depends on STALDRV && BROKEN_ON_SMP && (ISA || EISA || PCI)
347 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
348 card, then this is for you; say Y. Make sure to read
349 <file:Documentation/stallion.txt>.
351 To compile this driver as a module, choose M here: the
352 module will be called stallion.
355 tristate "Stallion EC8/64, ONboard, Brumby support"
356 depends on STALDRV && BROKEN_ON_SMP && (ISA || EISA || PCI)
358 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
359 serial multiport card, say Y here. Make sure to read
360 <file:Documentation/stallion.txt>.
362 To compile this driver as a module, choose M here: the
363 module will be called istallion.
366 tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
367 depends on PCI && EXPERIMENTAL
369 If you have a HSDPA driver Broadband Wireless Data Card -
370 Globe Trotter PCMCIA card, say Y here.
372 To compile this driver as a module, choose M here, the module
373 will be called nozomi.
376 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
377 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
379 This option supports the 2232 7-port serial card shipped with the
380 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
381 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
382 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
383 ports were connected with 8 pin DIN connectors on the card bracket,
384 for which 8 pin to DB25 adapters were supplied. The card also had
385 jumpers internally to toggle various pinning configurations.
387 This driver can be built as a module; but then "generic_serial"
388 will also be built as a module. This has to be loaded before
389 "ser_a2232". If you want to do this, answer M here.
392 bool "SGI Altix system controller communication support"
393 depends on (IA64_SGI_SN2 || IA64_GENERIC)
395 If you have an SGI Altix and you want to enable system
396 controller communication from user space (you want this!),
397 say Y. Otherwise, say N.
400 bool "SGI TIO CX driver support"
401 depends on (IA64_SGI_SN2 || IA64_GENERIC)
403 If you have an SGI Altix and you have fpga devices attached
404 to your TIO, say Y here, otherwise say N.
407 tristate "SGI FPGA Core Services driver support"
410 If you have an SGI Altix with an attached SABrick
411 say Y or M here, otherwise say N.
413 source "drivers/serial/Kconfig"
416 bool "Unix98 PTY support" if EMBEDDED
419 A pseudo terminal (PTY) is a software device consisting of two
420 halves: a master and a slave. The slave device behaves identical to
421 a physical terminal; the master device is used by a process to
422 read data from and write data to the slave, thereby emulating a
423 terminal. Typical programs for the master side are telnet servers
426 Linux has traditionally used the BSD-like names /dev/ptyxx for
427 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
428 has a number of problems. The GNU C library glibc 2.1 and later,
429 however, supports the Unix98 naming standard: in order to acquire a
430 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
431 terminal is then made available to the process and the pseudo
432 terminal slave can be accessed as /dev/pts/<number>. What was
433 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
435 All modern Linux systems use the Unix98 ptys. Say Y unless
436 you're on an embedded system and want to conserve memory.
439 bool "Legacy (BSD) PTY support"
442 A pseudo terminal (PTY) is a software device consisting of two
443 halves: a master and a slave. The slave device behaves identical to
444 a physical terminal; the master device is used by a process to
445 read data from and write data to the slave, thereby emulating a
446 terminal. Typical programs for the master side are telnet servers
449 Linux has traditionally used the BSD-like names /dev/ptyxx
450 for masters and /dev/ttyxx for slaves of pseudo
451 terminals. This scheme has a number of problems, including
452 security. This option enables these legacy devices; on most
453 systems, it is safe to say N.
456 config LEGACY_PTY_COUNT
457 int "Maximum number of legacy PTY in use"
458 depends on LEGACY_PTYS
462 The maximum number of legacy PTYs that can be used at any one time.
463 The default is 256, and should be more than enough. Embedded
464 systems may want to reduce this to save memory.
466 When not in use, each legacy PTY occupies 12 bytes on 32-bit
467 architectures and 24 bytes on 64-bit architectures.
470 tristate 'Total Impact briQ front panel driver'
473 The briQ is a small footprint CHRP computer with a frontpanel VFD, a
474 tristate led and two switches. It is the size of a CDROM drive.
476 If you have such one and want anything showing on the VFD then you
479 To compile this driver as a module, choose M here: the
480 module will be called briq_panel.
482 It's safe to say N here.
485 tristate "Blackfin On-Chip OTP Memory Support"
486 depends on BLACKFIN && (BF52x || BF54x)
489 If you say Y here, you will get support for a character device
490 interface into the One Time Programmable memory pages that are
491 stored on the Blackfin processor. This will not get you access
492 to the secure memory pages however. You will need to write your
493 own secure code and reader for that.
495 To compile this driver as a module, choose M here: the module
496 will be called bfin-otp.
498 If unsure, it is safe to say Y.
500 config BFIN_OTP_WRITE_ENABLE
501 bool "Enable writing support of OTP pages"
505 If you say Y here, you will enable support for writing of the
506 OTP pages. This is dangerous by nature as you can only program
507 the pages once, so only enable this option when you actually
508 need it so as to not inadvertently clobber data.
513 tristate "Parallel printer support"
516 If you intend to attach a printer to the parallel port of your Linux
517 box (as opposed to using a serial printer; if the connector at the
518 printer has 9 or 25 holes ["female"], then it's serial), say Y.
519 Also read the Printing-HOWTO, available from
520 <http://www.tldp.org/docs.html#howto>.
522 It is possible to share one parallel port among several devices
523 (e.g. printer and ZIP drive) and it is safe to compile the
524 corresponding drivers into the kernel.
526 To compile this driver as a module, choose M here and read
527 <file:Documentation/parport.txt>. The module will be called lp.
529 If you have several parallel ports, you can specify which ports to
530 use with the "lp" kernel command line option. (Try "man bootparam"
531 or see the documentation of your boot loader (lilo or loadlin) about
532 how to pass options to the kernel at boot time.) The syntax of the
533 "lp" command line option can be found in <file:drivers/char/lp.c>.
535 If you have more than 8 printers, you need to increase the LP_NO
536 macro in lp.c and the PARPORT_MAX macro in parport.h.
539 bool "Support for console on line printer"
542 If you want kernel messages to be printed out as they occur, you
543 can have a console on the printer. This option adds support for
544 doing that; to actually get it to happen you need to pass the
545 option "console=lp0" to the kernel at boot time.
547 If the printer is out of paper (or off, or unplugged, or too
548 busy..) the kernel will stall until the printer is ready again.
549 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
550 can make the kernel continue when this happens,
551 but it'll lose the kernel messages.
556 tristate "Support for user-space parallel port device drivers"
559 Saying Y to this adds support for /dev/parport device nodes. This
560 is needed for programs that want portable access to the parallel
561 port, for instance deviceid (which displays Plug-and-Play device
564 This is the parallel port equivalent of SCSI generic support (sg).
565 It is safe to say N to this -- it is not needed for normal printing
566 or parallel port CD-ROM/disk support.
568 To compile this driver as a module, choose M here: the
569 module will be called ppdev.
576 Generic "hypervisor virtual console" infrastructure for various
577 hypervisors (pSeries, iSeries, Xen, lguest).
578 It will automatically be selected if one of the back-end console drivers
583 bool "pSeries Hypervisor Virtual Console support"
584 depends on PPC_PSERIES
587 pSeries machines when partitioned support a hypervisor virtual
588 console. This driver allows each pSeries partition to have a console
589 which is accessed via the HMC.
592 bool "iSeries Hypervisor Virtual Console support"
593 depends on PPC_ISERIES
597 iSeries machines support a hypervisor virtual console.
600 bool "IBM RTAS Console support"
604 IBM Console device driver which makes use of RTAS
607 bool "Toshiba's Beat Hypervisor Console support"
608 depends on PPC_CELLEB
611 Toshiba's Cell Reference Set Beat Console device driver
614 bool "Xen Hypervisor Console support"
619 Xen virtual console device driver
621 config VIRTIO_CONSOLE
626 tristate "IBM Hypervisor Virtual Console Server support"
627 depends on PPC_PSERIES
629 Partitionable IBM Power5 ppc64 machines allow hosting of
630 firmware virtual consoles from one Linux partition by
631 another Linux partition. This driver allows console data
632 from Linux partitions to be accessed through TTY device
633 interfaces in the device tree of a Linux partition running
636 To compile this driver as a module, choose M here: the
637 module will be called hvcs.ko. Additionally, this module
638 will depend on arch specific APIs exported from hvcserver.ko
639 which will also be compiled when this driver is built as a
643 tristate "IBM POWER Barrier Synchronization Register support"
644 depends on PPC_PSERIES
646 This devices exposes a hardware mechanism for fast synchronization
647 of threads across a large system which avoids bouncing a cacheline
648 between several cores on a system
650 source "drivers/char/ipmi/Kconfig"
653 tristate "NetWinder thermometer support"
654 depends on ARCH_NETWINDER
656 Say Y here to include support for the thermal management hardware
657 found in the NetWinder. This driver allows the user to control the
658 temperature set points and to read the current temperature.
660 It is also possible to say M here to build it as a module (ds1620)
661 It is recommended to be used on a NetWinder, but it is not a
665 tristate "NetWinder Button"
666 depends on ARCH_NETWINDER
668 If you say Y here and create a character device node /dev/nwbutton
669 with major and minor numbers 10 and 158 ("man mknod"), then every
670 time the orange button is pressed a number of times, the number of
671 times the button was pressed will be written to that device.
673 This is most useful for applications, as yet unwritten, which
674 perform actions based on how many times the button is pressed in a
677 Do not hold the button down for too long, as the driver does not
678 alter the behaviour of the hardware reset circuitry attached to the
679 button; it will still execute a hard reset if the button is held
680 down for longer than approximately five seconds.
682 To compile this driver as a module, choose M here: the
683 module will be called nwbutton.
685 Most people will answer Y to this question and "Reboot Using Button"
686 below to be able to initiate a system shutdown from the button.
688 config NWBUTTON_REBOOT
689 bool "Reboot Using Button"
692 If you say Y here, then you will be able to initiate a system
693 shutdown and reboot by pressing the orange button a number of times.
694 The number of presses to initiate the shutdown is two by default,
695 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
696 in nwbutton.h and recompiling the driver or, if you compile the
697 driver as a module, you can specify the number of presses at load
698 time with "insmod button reboot_count=<something>".
701 tristate "NetWinder flash support"
702 depends on ARCH_NETWINDER
704 If you say Y here and create a character device /dev/flash with
705 major 10 and minor 160 you can manipulate the flash ROM containing
706 the NetWinder firmware. Be careful as accidentally overwriting the
707 flash contents can render your computer unbootable. On no account
708 allow random users access to this device. :-)
710 To compile this driver as a module, choose M here: the
711 module will be called nwflash.
713 If you're not sure, say N.
715 source "drivers/char/hw_random/Kconfig"
718 tristate "/dev/nvram support"
719 depends on ATARI || X86 || ARM || GENERIC_NVRAM
721 If you say Y here and create a character special file /dev/nvram
722 with major number 10 and minor number 144 using mknod ("man mknod"),
723 you get read and write access to the extra bytes of non-volatile
724 memory in the real time clock (RTC), which is contained in every PC
725 and most Ataris. The actual number of bytes varies, depending on the
726 nvram in the system, but is usually 114 (128-14 for the RTC).
728 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
729 on Ataris. /dev/nvram may be used to view settings there, or to
730 change them (with some utility). It could also be used to frequently
731 save a few bits of very important data that may not be lost over
732 power-off and for which writing to disk is too insecure. Note
733 however that most NVRAM space in a PC belongs to the BIOS and you
734 should NEVER idly tamper with it. See Ralf Brown's interrupt list
735 for a guide to the use of CMOS bytes by your BIOS.
737 On Atari machines, /dev/nvram is always configured and does not need
740 To compile this driver as a module, choose M here: the
741 module will be called nvram.
744 # These legacy RTC drivers just cause too many conflicts with the generic
745 # RTC framework ... let's not even try to coexist any more.
750 tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)"
751 depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV \
752 && !ARM && !SUPERH && !S390 && !AVR32
754 If you say Y here and create a character special file /dev/rtc with
755 major number 10 and minor number 135 using mknod ("man mknod"), you
756 will get access to the real time clock (or hardware clock) built
759 Every PC has such a clock built in. It can be used to generate
760 signals from as low as 1Hz up to 8192Hz, and can also be used
761 as a 24 hour alarm. It reports status information via the file
762 /proc/driver/rtc and its behaviour is set by various ioctls on
765 If you run Linux on a multiprocessor machine and said Y to
766 "Symmetric Multi Processing" above, you should say Y here to read
767 and set the RTC in an SMP compatible fashion.
769 If you think you have a use for such a device (such as periodic data
770 sampling), then say Y here, and read <file:Documentation/rtc.txt>
773 To compile this driver as a module, choose M here: the
774 module will be called rtc.
777 tristate "Enhanced Real Time Clock Support"
778 depends on SPARC32 && PCI
780 If you say Y here and create a character special file /dev/rtc with
781 major number 10 and minor number 135 using mknod ("man mknod"), you
782 will get access to the real time clock (or hardware clock) built
785 Every PC has such a clock built in. It can be used to generate
786 signals from as low as 1Hz up to 8192Hz, and can also be used
787 as a 24 hour alarm. It reports status information via the file
788 /proc/driver/rtc and its behaviour is set by various ioctls on
791 If you think you have a use for such a device (such as periodic data
792 sampling), then say Y here, and read <file:Documentation/rtc.txt>
795 To compile this driver as a module, choose M here: the
796 module will be called js-rtc.
799 tristate "SGI DS1286 RTC support"
800 depends on SGI_HAS_DS1286
802 If you say Y here and create a character special file /dev/rtc with
803 major number 10 and minor number 135 using mknod ("man mknod"), you
804 will get access to the real time clock built into your computer.
805 Every SGI has such a clock built in. It reports status information
806 via the file /proc/rtc and its behaviour is set by various ioctls on
810 bool "SGI M48T35 RTC support"
813 If you say Y here and create a character special file /dev/rtc with
814 major number 10 and minor number 135 using mknod ("man mknod"), you
815 will get access to the real time clock built into your computer.
816 Every SGI has such a clock built in. It reports status information
817 via the file /proc/rtc and its behaviour is set by various ioctls on
821 tristate "Generic /dev/rtc emulation"
822 depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH && !AVR32
824 If you say Y here and create a character special file /dev/rtc with
825 major number 10 and minor number 135 using mknod ("man mknod"), you
826 will get access to the real time clock (or hardware clock) built
829 It reports status information via the file /proc/driver/rtc and its
830 behaviour is set by various ioctls on /dev/rtc. If you enable the
831 "extended RTC operation" below it will also provide an emulation
832 for RTC_UIE which is required by some programs and may improve
833 precision in some cases.
835 To compile this driver as a module, choose M here: the
836 module will be called genrtc.
839 bool "Extended RTC operation"
842 Provides an emulation for RTC_UIE which is required by some programs
843 and may improve precision of the generic RTC support in some cases.
846 bool "EFI Real Time Clock Services"
850 tristate "DS1302 RTC support"
851 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
853 If you say Y here and create a character special file /dev/rtc with
854 major number 121 and minor number 0 using mknod ("man mknod"), you
855 will get access to the real time clock (or hardware clock) built
861 bool "Support for Cobalt LCD"
862 depends on MIPS_COBALT
864 This option enables support for the LCD display and buttons found
865 on Cobalt systems through a misc device.
868 tristate "Double Talk PC internal speech card support"
871 This driver is for the DoubleTalk PC, a speech synthesizer
872 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
873 called the `internal DoubleTalk'.
875 To compile this driver as a module, choose M here: the
876 module will be called dtlk.
879 tristate "Xilinx HWICAP Support"
880 depends on XILINX_VIRTEX
882 This option enables support for Xilinx Internal Configuration
883 Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex
884 FPGA platforms to partially reconfigure the FPGA at runtime.
889 tristate "Siemens R3964 line discipline"
891 This driver allows synchronous communication with devices using the
892 Siemens R3964 packet protocol. Unless you are dealing with special
893 hardware like PLCs, you are unlikely to need this.
895 To compile this driver as a module, choose M here: the
896 module will be called n_r3964.
901 tristate "Applicom intelligent fieldbus card support"
904 This driver provides the kernel-side support for the intelligent
905 fieldbus cards made by Applicom International. More information
906 about these cards can be found on the WWW at the address
907 <http://www.applicom-int.com/>, or by email from David Woodhouse
908 <dwmw2@infradead.org>.
910 To compile this driver as a module, choose M here: the
911 module will be called applicom.
916 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
917 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
919 This driver enables access to the Sony Programmable I/O Control
920 Device which can be found in many (all ?) Sony Vaio laptops.
922 If you have one of those laptops, read
923 <file:Documentation/laptops/sonypi.txt>, and say Y or M here.
925 To compile this driver as a module, choose M here: the
926 module will be called sonypi.
929 tristate "TANBAC TB0219 GPIO support"
930 depends on TANBAC_TB022X
933 source "drivers/char/pcmcia/Kconfig"
936 tristate "ACP Modem (Mwave) support"
940 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
941 kernel driver and a user level application. Together these components
942 support direct attachment to public switched telephone networks (PSTNs)
943 and support selected world wide countries.
945 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
946 600, and 770 that include on board ACP modem hardware.
948 The modem also supports the standard communications port interface
949 (ttySx) and is compatible with the Hayes AT Command Set.
951 The user level application needed to use this driver can be found at
952 the IBM Linux Technology Center (LTC) web site:
953 <http://www.ibm.com/linux/ltc/>.
955 If you own one of the above IBM Thinkpads which has the Mwave chipset
958 To compile this driver as a module, choose M here: the
959 module will be called mwave.
962 tristate "NatSemi SCx200 GPIO Support"
966 Give userspace access to the GPIO pins on the National
967 Semiconductor SCx200 processors.
969 If compiled as a module, it will be called scx200_gpio.
972 tristate "NatSemi PC8736x GPIO Support"
974 default SCx200_GPIO # mostly N
975 select NSC_GPIO # needed for support routines
977 Give userspace access to the GPIO pins on the National
978 Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
979 has multiple functional units, inc several managed by
980 hwmon/pc87360 driver. Tested with PC-87366
982 If compiled as a module, it will be called pc8736x_gpio.
985 tristate "NatSemi Base GPIO Support"
987 # selected by SCx200_GPIO and PC8736x_GPIO
988 # what about 2 selectors differing: m != y
990 Common support used (and needed) by scx200_gpio and
991 pc8736x_gpio drivers. If those drivers are built as
992 modules, this one will be too, named nsc_gpio
995 tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
998 Give userspace access to the GPIO pins on the AMD CS5535 and
999 CS5536 Geode companion devices.
1001 If compiled as a module, it will be called cs5535_gpio.
1004 tristate "NEC VR4100 series General-purpose I/O Unit support"
1005 depends on CPU_VR41XX
1008 tristate "RAW driver (/dev/raw/rawN)"
1011 The raw driver permits block devices to be bound to /dev/raw/rawN.
1012 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
1013 See the raw(8) manpage for more details.
1015 Applications should preferably open the device (eg /dev/hda1)
1016 with the O_DIRECT flag.
1019 int "Maximum number of RAW devices to support (1-8192)"
1020 depends on RAW_DRIVER
1023 The maximum number of RAW devices that are supported.
1024 Default is 256. Increase this number in case you need lots of
1028 bool "HPET - High Precision Event Timer" if (X86 || IA64)
1032 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
1033 open selects one of the timers supported by the HPET. The timers are
1034 non-periodic and/or periodic.
1038 default HPET_EMULATE_RTC
1039 depends on RTC && HPET
1041 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
1042 is assumed the platform called hpet_alloc with the RTC IRQ values for
1046 bool "Allow mmap of HPET"
1050 If you say Y here, user applications will be able to mmap
1053 In some hardware implementations, the page containing HPET
1054 registers may also contain other things that shouldn't be
1055 exposed to the user. If this applies to your hardware,
1058 config HANGCHECK_TIMER
1059 tristate "Hangcheck timer"
1060 depends on X86 || IA64 || PPC64 || S390
1062 The hangcheck-timer module detects when the system has gone
1063 out to lunch past a certain margin. It can reboot the system
1064 or merely print a warning.
1067 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1068 depends on IA64_GENERIC || IA64_SGI_SN2
1071 The mmtimer device allows direct userspace access to the
1074 source "drivers/char/tpm/Kconfig"
1077 tristate "Telecom clock driver for ATCA SBC"
1078 depends on EXPERIMENTAL && X86
1081 The telecom clock device is specific to the MPCBL0010 and MPCBL0050
1082 ATCA computers and allows direct userspace access to the
1083 configuration of the telecom clock configuration settings. This
1084 device is used for hardware synchronization across the ATCA backplane
1085 fabric. Upon loading, the driver exports a sysfs directory,
1086 /sys/devices/platform/telco_clock, with a number of files for
1087 controlling the behavior of this hardware.
1092 depends on ISA || PCI
1095 source "drivers/s390/char/Kconfig"
projects / linux-2.6 / blob