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 && !USERMODE
66 tristate "Moxa CPU platform DI/DO support"
67 depends on ARCH_MOXACPU
70 tristate "Moxa CPU platform DI/DO support for W325"
71 depends on ARCH_MOXACPU
74 tristate "Moxa CPU platform RTC (real time clock) support"
75 depends on ARCH_MOXACPU
78 tristate "Moxa CPU platform misc support"
79 depends on ARCH_MOXACPU
82 tristate "Moxa CPU platform watchdog support"
83 depends on ARCH_MOXACPU
86 tristate "Moxa CPU platform cipher support"
87 depends on ARCH_MOXACPU
90 config SERIAL_NONSTANDARD
91 bool "Non-standard serial port support"
93 Say Y here if you have any non-standard serial boards -- boards
94 which aren't supported using the standard "dumb" serial driver.
95 This includes intelligent serial boards such as Cyclades,
96 Digiboards, etc. These are usually used for systems that need many
97 serial ports because they serve many terminals or dial-in
100 Note that the answer to this question won't directly affect the
101 kernel: saying N will just cause the configurator to skip all
102 the questions about non-standard serial boards.
104 Most people can say N here.
107 tristate "Computone IntelliPort Plus serial support"
108 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
110 This driver supports the entire family of Intelliport II/Plus
111 controllers with the exception of the MicroChannel controllers and
112 products previous to the Intelliport II. These are multiport cards,
113 which give you many serial ports. You would need something like this
114 to connect more than two modems to your Linux box, for instance in
115 order to become a dial-in server. If you have a card like that, say
116 Y here and read <file:Documentation/computone.txt>.
118 To compile this driver as modules, choose M here: the
119 modules will be called ip2 and ip2main.
122 tristate "Comtrol RocketPort support"
123 depends on SERIAL_NONSTANDARD
125 This driver supports Comtrol RocketPort and RocketModem PCI boards.
126 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
127 modems. For information about the RocketPort/RocketModem boards
128 and this driver read <file:Documentation/rocket.txt>.
130 To compile this driver as a module, choose M here: the
131 module will be called rocket.
133 If you want to compile this driver into the kernel, say Y here. If
134 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
137 tristate "Cyclades async mux support"
138 depends on SERIAL_NONSTANDARD
140 This driver supports Cyclades Z and Y multiserial boards.
141 You would need something like this to connect more than two modems to
142 your Linux box, for instance in order to become a dial-in server.
144 For information about the Cyclades-Z card, read
145 <file:drivers/char/README.cycladesZ>.
147 To compile this driver as a module, choose M here: the
148 module will be called cyclades.
150 If you haven't heard about it, it's safe to say N.
153 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
154 depends on EXPERIMENTAL && CYCLADES
156 The Cyclades-Z family of multiport cards allows 2 (two) driver op
157 modes: polling and interrupt. In polling mode, the driver will check
158 the status of the Cyclades-Z ports every certain amount of time
159 (which is called polling cycle and is configurable). In interrupt
160 mode, it will use an interrupt line (IRQ) in order to check the
161 status of the Cyclades-Z ports. The default op mode is polling. If
165 tristate "Digiboard Intelligent Async Support"
166 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
168 This is a driver for Digi International's Xx, Xeve, and Xem series
169 of cards which provide multiple serial ports. You would need
170 something like this to connect more than two modems to your Linux
171 box, for instance in order to become a dial-in server. This driver
172 supports the original PC (ISA) boards as well as PCI, and EISA. If
173 you have a card like this, say Y here and read the file
174 <file:Documentation/digiepca.txt>.
176 NOTE: There is another, separate driver for the Digiboard PC boards:
177 "Digiboard PC/Xx Support" below. You should (and can) only select
178 one of the two drivers.
180 To compile this driver as a module, choose M here: the
181 module will be called epca.
184 tristate "Digiboard PC/Xx Support"
185 depends on SERIAL_NONSTANDARD && DIGIEPCA=n && BROKEN_ON_SMP
187 This is a driver for the Digiboard PC/Xe, PC/Xi, and PC/Xeve cards
188 that give you many serial ports. You would need something like this
189 to connect more than two modems to your Linux box, for instance in
190 order to become a dial-in server. If you have a card like that, say
191 Y here and read the file <file:Documentation/digiboard.txt>.
193 To compile this driver as a module, choose M here: the
194 module will be called pcxx.
197 tristate "3G cardbus card for Nozomi support"
198 depends on SERIAL_NONSTANDARD && ARCH_MOXACPU && PCMCIA
200 This is a 3G card. To support GPRS & UMTS communication.
203 tristate "3G cardbus card for HSO support"
204 depends on SERIAL_NONSTANDARD && ARCH_MOXACPU && PCMCIA
206 This is a 3G card. To support GPRS & UMTS communication.
209 tristate "Hayes ESP serial port support"
210 depends on SERIAL_NONSTANDARD && ISA && BROKEN_ON_SMP
212 This is a driver which supports Hayes ESP serial ports. Both single
213 port cards and multiport cards are supported. Make sure to read
214 <file:Documentation/hayes-esp.txt>.
216 To compile this driver as a module, choose M here: the
217 module will be called esp.
222 tristate "Moxa Intellio support"
223 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
225 Say Y here if you have a Moxa Intellio multiport serial card.
227 To compile this driver as a module, choose M here: the
228 module will be called moxa.
231 tristate "Moxa SmartIO support"
232 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
234 Say Y here if you have a Moxa SmartIO multiport serial card.
236 This driver can also be built as a module ( = code which can be
237 inserted in and removed from the running kernel whenever you want).
238 The module will be called mxser. If you want to do that, say M
241 config MOXA_SMARTIO_PCIE
242 tristate "Moxa SmartIO PCIe support"
243 depends on SERIAL_NONSTANDARD
245 Say Y here if you have a Moxa SmartIO multiport serial card.
247 This driver can also be built as a module ( = code which can be
248 inserted in and removed from the running kernel whenever you want).
249 The module will be called mxser. If you want to do that, say M
253 tristate "Moxa CPU CPE development platform"
254 depends on SERIAL_NONSTANDARD && ARCH_MOXACPU && ARCH_CPE
256 Say Y to use Moxa CPU & CPE devkit with embedded UART.
258 config SERIAL_CPE_CONSOLE
259 bool "Moxa CPU CPE devkit console"
260 depends on SERIAL_CPE
262 To support MOXA CPU embedded UART for console.
265 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
266 depends on SERIAL_NONSTANDARD && PCI && EXPERIMENTAL && BROKEN_ON_SMP && m
268 This is a driver for the Multi-Tech cards which provide several
269 serial ports. The driver is experimental and can currently only be
270 built as a module. The module will be called isicom.
271 If you want to do that, choose M here.
274 tristate "Microgate SyncLink card support"
275 depends on SERIAL_NONSTANDARD && PCI
277 Provides support for the SyncLink ISA and PCI multiprotocol serial
278 adapters. These adapters support asynchronous and HDLC bit
279 synchronous communication up to 10Mbps (PCI adapter).
281 This driver can only be built as a module ( = code which can be
282 inserted in and removed from the running kernel whenever you want).
283 The module will be called synclink. If you want to do that, say M
287 tristate "SyncLink Multiport support"
288 depends on SERIAL_NONSTANDARD
290 Enable support for the SyncLink Multiport (2 or 4 ports)
291 serial adapter, running asynchronous and HDLC communications up
292 to 2.048Mbps. Each ports is independently selectable for
293 RS-232, V.35, RS-449, RS-530, and X.21
295 This driver may be built as a module ( = code which can be
296 inserted in and removed from the running kernel whenever you want).
297 The module will be called synclinkmp. If you want to do that, say M
301 tristate "HDLC line discipline support"
302 depends on SERIAL_NONSTANDARD
304 Allows synchronous HDLC communications with tty device drivers that
305 support synchronous HDLC such as the Microgate SyncLink adapter.
307 This driver can only be built as a module ( = code which can be
308 inserted in and removed from the running kernel whenever you want).
309 The module will be called n_hdlc. If you want to do that, say M
313 tristate "SDL RISCom/8 card support"
314 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
316 This is a driver for the SDL Communications RISCom/8 multiport card,
317 which gives you many serial ports. You would need something like
318 this to connect more than two modems to your Linux box, for instance
319 in order to become a dial-in server. If you have a card like that,
320 say Y here and read the file <file:Documentation/riscom8.txt>.
322 Also it's possible to say M here and compile this driver as kernel
323 loadable module; the module will be called riscom8.
326 tristate "Specialix IO8+ card support"
327 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
329 This is a driver for the Specialix IO8+ multiport card (both the
330 ISA and the PCI version) which gives you many serial ports. You
331 would need something like this to connect more than two modems to
332 your Linux box, for instance in order to become a dial-in server.
334 If you have a card like that, say Y here and read the file
335 <file:Documentation/specialix.txt>. Also it's possible to say M here
336 and compile this driver as kernel loadable module which will be
339 config SPECIALIX_RTSCTS
340 bool "Specialix DTR/RTS pin is RTS"
343 The Specialix IO8+ card can only support either RTS or DTR. If you
344 say N here, the driver will use the pin as "DTR" when the tty is in
345 software handshake mode. If you say Y here or hardware handshake is
346 on, it will always be RTS. Read the file
347 <file:Documentation/specialix.txt> for more information.
350 tristate "Specialix SX (and SI) card support"
351 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
353 This is a driver for the SX and SI multiport serial cards.
354 Please read the file <file:Documentation/sx.txt> for details.
356 This driver can only be built as a module ( = code which can be
357 inserted in and removed from the running kernel whenever you want).
358 The module will be called sx. If you want to do that, say M here.
361 tristate "Specialix RIO system support"
362 depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
364 This is a driver for the Specialix RIO, a smart serial card which
365 drives an outboard box that can support up to 128 ports. Product
366 information is at <http://www.perle.com/support/documentation.html#multiport>.
367 There are both ISA and PCI versions.
370 bool "Support really old RIO/PCI cards"
373 Older RIO PCI cards need some initialization-time configuration to
374 determine the IRQ and some control addresses. If you have a RIO and
375 this doesn't seem to work, try setting this to Y.
378 bool "Stallion multiport serial support"
379 depends on SERIAL_NONSTANDARD
381 Stallion cards give you many serial ports. You would need something
382 like this to connect more than two modems to your Linux box, for
383 instance in order to become a dial-in server. If you say Y here,
384 you will be asked for your specific card model in the next
385 questions. Make sure to read <file:Documentation/stallion.txt> in
386 this case. If you have never heard about all this, it's safe to
390 tristate "Stallion EasyIO or EC8/32 support"
391 depends on STALDRV && BROKEN_ON_SMP
393 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
394 card, then this is for you; say Y. Make sure to read
395 <file:Documentation/stallion.txt>.
397 To compile this driver as a module, choose M here: the
398 module will be called stallion.
401 tristate "Stallion EC8/64, ONboard, Brumby support"
402 depends on STALDRV && BROKEN_ON_SMP
404 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
405 serial multiport card, say Y here. Make sure to read
406 <file:Documentation/stallion.txt>.
408 To compile this driver as a module, choose M here: the
409 module will be called istallion.
412 bool "TX3912/PR31700 serial port support"
413 depends on SERIAL_NONSTANDARD && MIPS && BROKEN_ON_SMP
415 The TX3912 is a Toshiba RISC processor based o the MIPS 3900 core;
416 see <http://www.toshiba.com/taec/components/Generic/risc/tx3912.htm>.
417 Say Y here to enable kernel support for the on-board serial port.
419 config SERIAL_TX3912_CONSOLE
420 bool "Console on TX3912/PR31700 serial port"
421 depends on SERIAL_TX3912
423 The TX3912 is a Toshiba RISC processor based o the MIPS 3900 core;
424 see <http://www.toshiba.com/taec/components/Generic/risc/tx3912.htm>.
425 Say Y here to direct console I/O to the on-board serial port.
428 bool "Enable Au1000 UART Support"
429 depends on SERIAL_NONSTANDARD && MIPS
431 If you have an Alchemy AU1000 processor (MIPS based) and you want
432 to use serial ports, say Y. Otherwise, say N.
434 config AU1000_SERIAL_CONSOLE
435 bool "Enable Au1000 serial console"
436 depends on AU1000_UART
438 If you have an Alchemy AU1000 processor (MIPS based) and you want
439 to use a console on a serial port, say Y. Otherwise, say N.
441 config QTRONIX_KEYBOARD
442 bool "Enable Qtronix 990P Keyboard Support"
445 Images of Qtronix keyboards are at
446 <http://www.qtronix.com/keyboard.html>.
450 depends on QTRONIX_KEYBOARD
454 bool "Enable Smart Card Reader 0 Support "
457 Say Y here to support smart-card reader 0 (SCR0) on the Integrated
458 Technology Express, Inc. ITE8172 SBC. Vendor page at
459 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
460 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
463 bool "Enable Smart Card Reader 1 Support "
466 Say Y here to support smart-card reader 1 (SCR1) on the Integrated
467 Technology Express, Inc. ITE8172 SBC. Vendor page at
468 <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
469 board at <http://www.mvista.com/partners/semiconductor/ite.html>.
472 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
473 depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
475 This option supports the 2232 7-port serial card shipped with the
476 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
477 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
478 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
479 ports were connected with 8 pin DIN connectors on the card bracket,
480 for which 8 pin to DB25 adapters were supplied. The card also had
481 jumpers internally to toggle various pinning configurations.
483 This driver can be built as a module; but then "generic_serial"
484 will also be built as a module. This has to be loaded before
485 "ser_a2232". If you want to do this, answer M here.
488 bool "LED Manager support"
490 Enbale the LED manager driver.
493 bool "Reset switch support"
495 Support the hardware reset switch.
498 bool "SGI Altix system controller communication support"
499 depends on (IA64_SGI_SN2 || IA64_GENERIC)
501 If you have an SGI Altix and you want to enable system
502 controller communication from user space (you want this!),
503 say Y. Otherwise, say N.
505 source "drivers/serial/Kconfig"
508 bool "Unix98 PTY support" if EMBEDDED
511 A pseudo terminal (PTY) is a software device consisting of two
512 halves: a master and a slave. The slave device behaves identical to
513 a physical terminal; the master device is used by a process to
514 read data from and write data to the slave, thereby emulating a
515 terminal. Typical programs for the master side are telnet servers
518 Linux has traditionally used the BSD-like names /dev/ptyxx for
519 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
520 has a number of problems. The GNU C library glibc 2.1 and later,
521 however, supports the Unix98 naming standard: in order to acquire a
522 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
523 terminal is then made available to the process and the pseudo
524 terminal slave can be accessed as /dev/pts/<number>. What was
525 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
527 All modern Linux systems use the Unix98 ptys. Say Y unless
528 you're on an embedded system and want to conserve memory.
531 bool "Legacy (BSD) PTY support"
534 A pseudo terminal (PTY) is a software device consisting of two
535 halves: a master and a slave. The slave device behaves identical to
536 a physical terminal; the master device is used by a process to
537 read data from and write data to the slave, thereby emulating a
538 terminal. Typical programs for the master side are telnet servers
541 Linux has traditionally used the BSD-like names /dev/ptyxx
542 for masters and /dev/ttyxx for slaves of pseudo
543 terminals. This scheme has a number of problems, including
544 security. This option enables these legacy devices; on most
545 systems, it is safe to say N.
548 config LEGACY_PTY_COUNT
549 int "Maximum number of legacy PTY in use"
550 depends on LEGACY_PTYS
553 The maximum number of legacy PTYs that can be used at any one time.
554 The default is 256, and should be more than enough. Embedded
555 systems may want to reduce this to save memory.
557 When not in use, each legacy PTY occupies 12 bytes on 32-bit
558 architectures and 24 bytes on 64-bit architectures.
561 tristate "Parallel printer support"
564 If you intend to attach a printer to the parallel port of your Linux
565 box (as opposed to using a serial printer; if the connector at the
566 printer has 9 or 25 holes ["female"], then it's serial), say Y.
567 Also read the Printing-HOWTO, available from
568 <http://www.tldp.org/docs.html#howto>.
570 It is possible to share one parallel port among several devices
571 (e.g. printer and ZIP drive) and it is safe to compile the
572 corresponding drivers into the kernel.
574 To compile this driver as a module, choose M here and read
575 <file:Documentation/parport.txt>. The module will be called lp.
577 If you have several parallel ports, you can specify which ports to
578 use with the "lp" kernel command line option. (Try "man bootparam"
579 or see the documentation of your boot loader (lilo or loadlin) about
580 how to pass options to the kernel at boot time.) The syntax of the
581 "lp" command line option can be found in <file:drivers/char/lp.c>.
583 If you have more than 8 printers, you need to increase the LP_NO
584 macro in lp.c and the PARPORT_MAX macro in parport.h.
587 bool "Support for console on line printer"
590 If you want kernel messages to be printed out as they occur, you
591 can have a console on the printer. This option adds support for
592 doing that; to actually get it to happen you need to pass the
593 option "console=lp0" to the kernel at boot time.
595 If the printer is out of paper (or off, or unplugged, or too
596 busy..) the kernel will stall until the printer is ready again.
597 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
598 can make the kernel continue when this happens,
599 but it'll lose the kernel messages.
604 tristate "Support for user-space parallel port device drivers"
607 Saying Y to this adds support for /dev/parport device nodes. This
608 is needed for programs that want portable access to the parallel
609 port, for instance deviceid (which displays Plug-and-Play device
612 This is the parallel port equivalent of SCSI generic support (sg).
613 It is safe to say N to this -- it is not needed for normal printing
614 or parallel port CD-ROM/disk support.
616 To compile this driver as a module, choose M here: the
617 module will be called ppdev.
622 tristate "Texas Instruments parallel link cable support"
625 If you own a Texas Instruments graphing calculator and use a
626 parallel link cable, then you might be interested in this driver.
628 If you enable this driver, you will be able to communicate with
629 your calculator through a set of device nodes under /dev. The
630 main advantage of this driver is that you don't have to be root
631 to use this precise link cable (depending on the permissions on
632 the device nodes, though).
634 To compile this driver as a module, choose M here: the
635 module will be called tipar.
637 If you don't know what a parallel link cable is or what a Texas
638 Instruments graphing calculator is, then you probably don't need this
644 bool "pSeries Hypervisor Virtual Console support"
645 depends on PPC_PSERIES
647 pSeries machines when partitioned support a hypervisor virtual
648 console. This driver allows each pSeries partition to have a console
649 which is accessed via the HMC.
652 tristate "IBM Hypervisor Virtual Console Server support"
653 depends on PPC_PSERIES
655 Partitionable IBM Power5 ppc64 machines allow hosting of
656 firmware virtual consoles from one Linux partition by
657 another Linux partition. This driver allows console data
658 from Linux partitions to be accessed through TTY device
659 interfaces in the device tree of a Linux partition running
662 To compile this driver as a module, choose M here: the
663 module will be called hvcs.ko. Additionally, this module
664 will depend on arch specific APIs exported from hvcserver.ko
665 which will also be compiled when this driver is built as a
668 source "drivers/char/ipmi/Kconfig"
670 source "drivers/char/watchdog/Kconfig"
673 tristate "Coldfire Watchdog"
677 Watchdog for Coldfire processors. /dev/watchdog is not used
678 for this driver. A timer-interrupt is updating the watchdog instead.
681 tristate "NetWinder thermometer support"
682 depends on ARCH_NETWINDER
684 Say Y here to include support for the thermal management hardware
685 found in the NetWinder. This driver allows the user to control the
686 temperature set points and to read the current temperature.
688 It is also possible to say M here to build it as a module (ds1620)
689 It is recommended to be used on a NetWinder, but it is not a
693 tristate "NetWinder Button"
694 depends on ARCH_NETWINDER
696 If you say Y here and create a character device node /dev/nwbutton
697 with major and minor numbers 10 and 158 ("man mknod"), then every
698 time the orange button is pressed a number of times, the number of
699 times the button was pressed will be written to that device.
701 This is most useful for applications, as yet unwritten, which
702 perform actions based on how many times the button is pressed in a
705 Do not hold the button down for too long, as the driver does not
706 alter the behaviour of the hardware reset circuitry attached to the
707 button; it will still execute a hard reset if the button is held
708 down for longer than approximately five seconds.
710 To compile this driver as a module, choose M here: the
711 module will be called nwbutton.
713 Most people will answer Y to this question and "Reboot Using Button"
714 below to be able to initiate a system shutdown from the button.
716 config NWBUTTON_REBOOT
717 bool "Reboot Using Button"
720 If you say Y here, then you will be able to initiate a system
721 shutdown and reboot by pressing the orange button a number of times.
722 The number of presses to initiate the shutdown is two by default,
723 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
724 in nwbutton.h and recompiling the driver or, if you compile the
725 driver as a module, you can specify the number of presses at load
726 time with "insmod button reboot_count=<something>".
729 tristate "NetWinder flash support"
730 depends on ARCH_NETWINDER
732 If you say Y here and create a character device /dev/flash with
733 major 10 and minor 160 you can manipulate the flash ROM containing
734 the NetWinder firmware. Be careful as accidentally overwriting the
735 flash contents can render your computer unbootable. On no account
736 allow random users access to this device. :-)
738 To compile this driver as a module, choose M here: the
739 module will be called nwflash.
741 If you're not sure, say N.
744 tristate "Intel/AMD/VIA HW Random Number Generator support"
745 depends on (X86 || IA64) && PCI
747 This driver provides kernel-side support for the Random Number
748 Generator hardware found on Intel i8xx-based motherboards,
749 AMD 76x-based motherboards, and Via Nehemiah CPUs.
751 Provides a character driver, used to read() entropy data.
753 To compile this driver as a module, choose M here: the
754 module will be called hw_random.
759 tristate "/dev/nvram support"
760 depends on ATARI || X86 || X86_64 || ARM || GENERIC_NVRAM
762 If you say Y here and create a character special file /dev/nvram
763 with major number 10 and minor number 144 using mknod ("man mknod"),
764 you get read and write access to the extra bytes of non-volatile
765 memory in the real time clock (RTC), which is contained in every PC
766 and most Ataris. The actual number of bytes varies, depending on the
767 nvram in the system, but is usually 114 (128-14 for the RTC).
769 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
770 on Ataris. /dev/nvram may be used to view settings there, or to
771 change them (with some utility). It could also be used to frequently
772 save a few bits of very important data that may not be lost over
773 power-off and for which writing to disk is too insecure. Note
774 however that most NVRAM space in a PC belongs to the BIOS and you
775 should NEVER idly tamper with it. See Ralf Brown's interrupt list
776 for a guide to the use of CMOS bytes by your BIOS.
778 On Atari machines, /dev/nvram is always configured and does not need
781 To compile this driver as a module, choose M here: the
782 module will be called nvram.
785 tristate "Enhanced Real Time Clock Support"
786 depends on !PPC32 && !PARISC && !IA64 && !M68K
788 If you say Y here and create a character special file /dev/rtc with
789 major number 10 and minor number 135 using mknod ("man mknod"), you
790 will get access to the real time clock (or hardware clock) built
793 Every PC has such a clock built in. It can be used to generate
794 signals from as low as 1Hz up to 8192Hz, and can also be used
795 as a 24 hour alarm. It reports status information via the file
796 /proc/driver/rtc and its behaviour is set by various ioctls on
799 If you run Linux on a multiprocessor machine and said Y to
800 "Symmetric Multi Processing" above, you should say Y here to read
801 and set the RTC in an SMP compatible fashion.
803 If you think you have a use for such a device (such as periodic data
804 sampling), then say Y here, and read <file:Documentation/rtc.txt>
807 To compile this driver as a module, choose M here: the
808 module will be called rtc.
811 tristate "SGI DS1286 RTC support"
814 If you say Y here and create a character special file /dev/rtc with
815 major number 10 and minor number 135 using mknod ("man mknod"), you
816 will get access to the real time clock built into your computer.
817 Every SGI has such a clock built in. It reports status information
818 via the file /proc/rtc and its behaviour is set by various ioctls on
822 bool "SGI M48T35 RTC support"
825 If you say Y here and create a character special file /dev/rtc with
826 major number 10 and minor number 135 using mknod ("man mknod"), you
827 will get access to the real time clock built into your computer.
828 Every SGI has such a clock built in. It reports status information
829 via the file /proc/rtc and its behaviour is set by various ioctls on
833 tristate "Generic /dev/rtc emulation"
834 depends on RTC!=y && !IA64 && !ARM
836 If you say Y here and create a character special file /dev/rtc with
837 major number 10 and minor number 135 using mknod ("man mknod"), you
838 will get access to the real time clock (or hardware clock) built
841 It reports status information via the file /proc/driver/rtc and its
842 behaviour is set by various ioctls on /dev/rtc. If you enable the
843 "extended RTC operation" below it will also provide an emulation
844 for RTC_UIE which is required by some programs and may improve
845 precision in some cases.
847 To compile this driver as a module, choose M here: the
848 module will be called genrtc.
851 bool "Extended RTC operation"
854 Provides an emulation for RTC_UIE which is required by some programs
855 and may improve precision of the generic RTC support in some cases.
858 bool "EFI Real Time Clock Services"
862 bool "Support for Cobalt LCD"
863 depends on MIPS_COBALT
865 This option enables support for the LCD display and buttons found
866 on Cobalt systems through a misc device.
869 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 "Siemens R3964 line discipline"
881 This driver allows synchronous communication with devices using the
882 Siemens R3964 packet protocol. Unless you are dealing with special
883 hardware like PLCs, you are unlikely to need this.
885 To compile this driver as a module, choose M here: the
886 module will be called n_r3964.
891 tristate "Applicom intelligent fieldbus card support"
894 This driver provides the kernel-side support for the intelligent
895 fieldbus cards made by Applicom International. More information
896 about these cards can be found on the WWW at the address
897 <http://www.applicom-int.com/>, or by email from David Woodhouse
898 <dwmw2@infradead.org>.
900 To compile this driver as a module, choose M here: the
901 module will be called applicom.
906 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
907 depends on EXPERIMENTAL && X86 && PCI && !64BIT
909 This driver enables access to the Sony Programmable I/O Control
910 Device which can be found in many (all ?) Sony Vaio laptops.
912 If you have one of those laptops, read
913 <file:Documentation/sonypi.txt>, and say Y or M here.
915 To compile this driver as a module, choose M here: the
916 module will be called sonypi.
919 menu "Ftape, the floppy tape device driver"
922 tristate "Ftape (QIC-80/Travan) support"
923 depends on BROKEN_ON_SMP && (ALPHA || X86)
925 If you have a tape drive that is connected to your floppy
926 controller, say Y here.
928 Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
929 "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
930 controller of their own. These drives (and their companion
931 controllers) are also supported if you say Y here.
933 If you have a special controller (such as the CMS FC-10, FC-20,
934 Mountain Mach-II, or any controller that is based on the Intel 82078
935 FDC like the high speed controllers by Seagate and Exabyte and
936 Iomega's "Ditto Dash") you must configure it by selecting the
937 appropriate entries from the "Floppy tape controllers" sub-menu
938 below and possibly modify the default values for the IRQ and DMA
939 channel and the IO base in ftape's configuration menu.
941 If you want to use your floppy tape drive on a PCI-bus based system,
942 please read the file <file:drivers/char/ftape/README.PCI>.
944 The ftape kernel driver is also available as a runtime loadable
945 module. To compile this driver as a module, choose M here: the
946 module will be called ftape.
948 Note that the Ftape-HOWTO is out of date (sorry) and documents the
949 older version 2.08 of this software but still contains useful
950 information. There is a web page with more recent documentation at
951 <http://www.instmath.rwth-aachen.de/~heine/ftape/>. This page
952 always contains the latest release of the ftape driver and useful
953 information (backup software, ftape related patches and
954 documentation, FAQ). Note that the file system interface has
955 changed quite a bit compared to previous versions of ftape. Please
956 read <file:Documentation/ftape.txt>.
958 source "drivers/char/ftape/Kconfig"
962 source "drivers/char/agp/Kconfig"
964 source "drivers/char/drm/Kconfig"
966 source "drivers/char/pcmcia/Kconfig"
969 tristate "ACP Modem (Mwave) support"
973 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
974 kernel driver and a user level application. Together these components
975 support direct attachment to public switched telephone networks (PSTNs)
976 and support selected world wide countries.
978 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
979 600, and 770 that include on board ACP modem hardware.
981 The modem also supports the standard communications port interface
982 (ttySx) and is compatible with the Hayes AT Command Set.
984 The user level application needed to use this driver can be found at
985 the IBM Linux Technology Center (LTC) web site:
986 <http://www.ibm.com/linux/ltc/>.
988 If you own one of the above IBM Thinkpads which has the Mwave chipset
991 To compile this driver as a module, choose M here: the
992 module will be called mwave.
995 tristate "NatSemi SCx200 GPIO Support"
998 Give userspace access to the GPIO pins on the National
999 Semiconductor SCx200 processors.
1001 If compiled as a module, it will be called scx200_gpio.
1004 tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
1006 The raw driver permits block devices to be bound to /dev/raw/rawN.
1007 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
1008 See the raw(8) manpage for more details.
1010 The raw driver is deprecated and may be removed from 2.7
1011 kernels. Applications should simply open the device (eg /dev/hda1)
1012 with the O_DIRECT flag.
1015 bool "HPET - High Precision Event Timer" if (X86 || IA64)
1019 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
1020 open selects one of the timers supported by the HPET. The timers are
1021 non-periodioc and/or periodic.
1024 bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
1028 If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
1029 is assumed the platform called hpet_alloc with the RTC IRQ values for
1033 bool "Allow mmap of HPET"
1037 If you say Y here, user applications will be able to mmap
1040 In some hardware implementations, the page containing HPET
1041 registers may also contain other things that shouldn't be
1042 exposed to the user. If this applies to your hardware,
1046 int "Maximum number of RAW devices to support (1-8192)"
1047 depends on RAW_DRIVER
1050 The maximum number of RAW devices that are supported.
1051 Default is 256. Increase this number in case you need lots of
1054 config HANGCHECK_TIMER
1055 tristate "Hangcheck timer"
1056 depends on X86_64 || X86
1058 The hangcheck-timer module detects when the system has gone
1059 out to lunch past a certain margin. It can reboot the system
1060 or merely print a warning.
1063 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1064 depends on IA64_GENERIC || IA64_SGI_SN2
1067 The mmtimer device allows direct userspace access to the