2 # Character device configuration
5 menu "Character devices"
8 bool "Virtual terminal" if EXPERT
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 :-)
39 config CONSOLE_TRANSLATIONS
42 bool "Enable character translations in console" if EXPERT
44 This enables support for font mapping and Unicode translation
48 bool "Support for console on virtual terminal" if EXPERT
52 The system console is the device which receives all kernel messages
53 and warnings and which allows logins in single user mode. If you
54 answer Y here, a virtual terminal (the device used to interact with
55 a physical terminal) can be used as system console. This is the most
56 common mode of operations, so you should say Y here unless you want
57 the kernel messages be output only to a serial port (in which case
58 you should say Y to "Console on serial port", below).
60 If you do say Y here, by default the currently visible virtual
61 terminal (/dev/tty0) will be used as system console. You can change
62 that with a kernel command line option such as "console=tty3" which
63 would use the third virtual terminal as system console. (Try "man
64 bootparam" or see the documentation of your boot loader (lilo or
65 loadlin) about how to pass options to the kernel at boot time.)
71 depends on VT && !S390 && !UML
74 config VT_HW_CONSOLE_BINDING
75 bool "Support for binding and unbinding console drivers"
79 The virtual terminal is the device that interacts with the physical
80 terminal through console drivers. On these systems, at least one
81 console driver is loaded. In other configurations, additional console
82 drivers may be enabled, such as the framebuffer console. If more than
83 1 console driver is enabled, setting this to 'y' will allow you to
84 select the console driver that will serve as the backend for the
87 See <file:Documentation/console/console.txt> for more
88 information. For framebuffer console users, please refer to
89 <file:Documentation/fb/fbcon.txt>.
92 bool "/dev/kmem virtual device support"
95 Say Y here if you want to support the /dev/kmem device. The
96 /dev/kmem device is rarely used, but can be used for certain
97 kind of kernel debugging operations.
98 When in doubt, say "N".
100 config BFIN_JTAG_COMM
101 tristate "Blackfin JTAG Communication"
104 Add support for emulating a TTY device over the Blackfin JTAG.
106 To compile this driver as a module, choose M here: the
107 module will be called bfin_jtag_comm.
109 config BFIN_JTAG_COMM_CONSOLE
110 bool "Console on Blackfin JTAG"
111 depends on BFIN_JTAG_COMM=y
113 config SERIAL_NONSTANDARD
114 bool "Non-standard serial port support"
117 Say Y here if you have any non-standard serial boards -- boards
118 which aren't supported using the standard "dumb" serial driver.
119 This includes intelligent serial boards such as Cyclades,
120 Digiboards, etc. These are usually used for systems that need many
121 serial ports because they serve many terminals or dial-in
124 Note that the answer to this question won't directly affect the
125 kernel: saying N will just cause the configurator to skip all
126 the questions about non-standard serial boards.
128 Most people can say N here.
131 tristate "Computone IntelliPort Plus serial support"
132 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
134 This driver supports the entire family of Intelliport II/Plus
135 controllers with the exception of the MicroChannel controllers and
136 products previous to the Intelliport II. These are multiport cards,
137 which give you many serial ports. You would need something like this
138 to connect more than two modems to your Linux box, for instance in
139 order to become a dial-in server. If you have a card like that, say
140 Y here and read <file:Documentation/serial/computone.txt>.
142 To compile this driver as module, choose M here: the
143 module will be called ip2.
146 tristate "Comtrol RocketPort support"
147 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
149 This driver supports Comtrol RocketPort and RocketModem PCI boards.
150 These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
151 modems. For information about the RocketPort/RocketModem boards
152 and this driver read <file:Documentation/serial/rocket.txt>.
154 To compile this driver as a module, choose M here: the
155 module will be called rocket.
157 If you want to compile this driver into the kernel, say Y here. If
158 you don't have a Comtrol RocketPort/RocketModem card installed, say N.
161 tristate "Cyclades async mux support"
162 depends on SERIAL_NONSTANDARD && (PCI || ISA)
165 This driver supports Cyclades Z and Y multiserial boards.
166 You would need something like this to connect more than two modems to
167 your Linux box, for instance in order to become a dial-in server.
169 For information about the Cyclades-Z card, read
170 <file:Documentation/serial/README.cycladesZ>.
172 To compile this driver as a module, choose M here: the
173 module will be called cyclades.
175 If you haven't heard about it, it's safe to say N.
178 bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
179 depends on EXPERIMENTAL && CYCLADES
181 The Cyclades-Z family of multiport cards allows 2 (two) driver op
182 modes: polling and interrupt. In polling mode, the driver will check
183 the status of the Cyclades-Z ports every certain amount of time
184 (which is called polling cycle and is configurable). In interrupt
185 mode, it will use an interrupt line (IRQ) in order to check the
186 status of the Cyclades-Z ports. The default op mode is polling. If
190 tristate "Digiboard Intelligent Async Support"
191 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
193 This is a driver for Digi International's Xx, Xeve, and Xem series
194 of cards which provide multiple serial ports. You would need
195 something like this to connect more than two modems to your Linux
196 box, for instance in order to become a dial-in server. This driver
197 supports the original PC (ISA) boards as well as PCI, and EISA. If
198 you have a card like this, say Y here and read the file
199 <file:Documentation/serial/digiepca.txt>.
201 To compile this driver as a module, choose M here: the
202 module will be called epca.
205 tristate "Moxa Intellio support"
206 depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
209 Say Y here if you have a Moxa Intellio multiport serial card.
211 To compile this driver as a module, choose M here: the
212 module will be called moxa.
215 tristate "Moxa SmartIO support v. 2.0"
216 depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
218 Say Y here if you have a Moxa SmartIO multiport serial card and/or
219 want to help develop a new version of this driver.
221 This is upgraded (1.9.1) driver from original Moxa drivers with
222 changes finally resulting in PCI probing.
224 This driver can also be built as a module. The module will be called
225 mxser. If you want to do that, say M here.
228 tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
229 depends on SERIAL_NONSTANDARD && PCI
232 This is a driver for the Multi-Tech cards which provide several
233 serial ports. The driver is experimental and can currently only be
234 built as a module. The module will be called isicom.
235 If you want to do that, choose M here.
238 tristate "Microgate SyncLink card support"
239 depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
241 Provides support for the SyncLink ISA and PCI multiprotocol serial
242 adapters. These adapters support asynchronous and HDLC bit
243 synchronous communication up to 10Mbps (PCI adapter).
245 This driver can only be built as a module ( = code which can be
246 inserted in and removed from the running kernel whenever you want).
247 The module will be called synclink. If you want to do that, say M
251 tristate "SyncLink Multiport support"
252 depends on SERIAL_NONSTANDARD && PCI
254 Enable support for the SyncLink Multiport (2 or 4 ports)
255 serial adapter, running asynchronous and HDLC communications up
256 to 2.048Mbps. Each ports is independently selectable for
257 RS-232, V.35, RS-449, RS-530, and X.21
259 This driver may be built as a module ( = code which can be
260 inserted in and removed from the running kernel whenever you want).
261 The module will be called synclinkmp. If you want to do that, say M
265 tristate "SyncLink GT/AC support"
266 depends on SERIAL_NONSTANDARD && PCI
268 Support for SyncLink GT and SyncLink AC families of
269 synchronous and asynchronous serial adapters
270 manufactured by Microgate Systems, Ltd. (www.microgate.com)
273 tristate "HDLC line discipline support"
274 depends on SERIAL_NONSTANDARD
276 Allows synchronous HDLC communications with tty device drivers that
277 support synchronous HDLC such as the Microgate SyncLink adapter.
279 This driver can be built as a module ( = code which can be
280 inserted in and removed from the running kernel whenever you want).
281 The module will be called n_hdlc. If you want to do that, say M
285 tristate "GSM MUX line discipline support (EXPERIMENTAL)"
286 depends on EXPERIMENTAL
289 This line discipline provides support for the GSM MUX protocol and
290 presents the mux as a set of 61 individual tty devices.
293 tristate "SDL RISCom/8 card support"
294 depends on SERIAL_NONSTANDARD
296 This is a driver for the SDL Communications RISCom/8 multiport card,
297 which gives you many serial ports. You would need something like
298 this to connect more than two modems to your Linux box, for instance
299 in order to become a dial-in server. If you have a card like that,
300 say Y here and read the file <file:Documentation/serial/riscom8.txt>.
302 Also it's possible to say M here and compile this driver as kernel
303 loadable module; the module will be called riscom8.
306 tristate "Specialix IO8+ card support"
307 depends on SERIAL_NONSTANDARD
309 This is a driver for the Specialix IO8+ multiport card (both the
310 ISA and the PCI version) which gives you many serial ports. You
311 would need something like this to connect more than two modems to
312 your Linux box, for instance in order to become a dial-in server.
314 If you have a card like that, say Y here and read the file
315 <file:Documentation/serial/specialix.txt>. Also it's possible to say
316 M here and compile this driver as kernel loadable module which will be
320 tristate "Specialix SX (and SI) card support"
321 depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA) && BROKEN
323 This is a driver for the SX and SI multiport serial cards.
324 Please read the file <file:Documentation/serial/sx.txt> for details.
326 This driver can only be built as a module ( = code which can be
327 inserted in and removed from the running kernel whenever you want).
328 The module will be called sx. If you want to do that, say M here.
331 tristate "Specialix RIO system support"
332 depends on SERIAL_NONSTANDARD && BROKEN
334 This is a driver for the Specialix RIO, a smart serial card which
335 drives an outboard box that can support up to 128 ports. Product
336 information is at <http://www.perle.com/support/documentation.html#multiport>.
337 There are both ISA and PCI versions.
340 bool "Support really old RIO/PCI cards"
343 Older RIO PCI cards need some initialization-time configuration to
344 determine the IRQ and some control addresses. If you have a RIO and
345 this doesn't seem to work, try setting this to Y.
348 bool "Stallion multiport serial support"
349 depends on SERIAL_NONSTANDARD
351 Stallion cards give you many serial ports. You would need something
352 like this to connect more than two modems to your Linux box, for
353 instance in order to become a dial-in server. If you say Y here,
354 you will be asked for your specific card model in the next
355 questions. Make sure to read <file:Documentation/serial/stallion.txt>
356 in this case. If you have never heard about all this, it's safe to
360 tristate "Stallion EasyIO or EC8/32 support"
361 depends on STALDRV && (ISA || EISA || PCI)
363 If you have an EasyIO or EasyConnection 8/32 multiport Stallion
364 card, then this is for you; say Y. Make sure to read
365 <file:Documentation/serial/stallion.txt>.
367 To compile this driver as a module, choose M here: the
368 module will be called stallion.
371 tristate "Stallion EC8/64, ONboard, Brumby support"
372 depends on STALDRV && (ISA || EISA || PCI)
374 If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
375 serial multiport card, say Y here. Make sure to read
376 <file:Documentation/serial/stallion.txt>.
378 To compile this driver as a module, choose M here: the
379 module will be called istallion.
382 tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
383 depends on PCI && EXPERIMENTAL
385 If you have a HSDPA driver Broadband Wireless Data Card -
386 Globe Trotter PCMCIA card, say Y here.
388 To compile this driver as a module, choose M here, the module
389 will be called nozomi.
392 tristate "Commodore A2232 serial support (EXPERIMENTAL)"
393 depends on EXPERIMENTAL && ZORRO && BROKEN
395 This option supports the 2232 7-port serial card shipped with the
396 Amiga 2000 and other Zorro-bus machines, dating from 1989. At
397 a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
398 each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
399 ports were connected with 8 pin DIN connectors on the card bracket,
400 for which 8 pin to DB25 adapters were supplied. The card also had
401 jumpers internally to toggle various pinning configurations.
403 This driver can be built as a module; but then "generic_serial"
404 will also be built as a module. This has to be loaded before
405 "ser_a2232". If you want to do this, answer M here.
408 bool "SGI Altix system controller communication support"
409 depends on (IA64_SGI_SN2 || IA64_GENERIC)
411 If you have an SGI Altix and you want to enable system
412 controller communication from user space (you want this!),
413 say Y. Otherwise, say N.
416 bool "SGI TIO CX driver support"
417 depends on (IA64_SGI_SN2 || IA64_GENERIC)
419 If you have an SGI Altix and you have fpga devices attached
420 to your TIO, say Y here, otherwise say N.
423 tristate "SGI FPGA Core Services driver support"
426 If you have an SGI Altix with an attached SABrick
427 say Y or M here, otherwise say N.
429 source "drivers/serial/Kconfig"
432 bool "Unix98 PTY support" if EXPERT
435 A pseudo terminal (PTY) is a software device consisting of two
436 halves: a master and a slave. The slave device behaves identical to
437 a physical terminal; the master device is used by a process to
438 read data from and write data to the slave, thereby emulating a
439 terminal. Typical programs for the master side are telnet servers
442 Linux has traditionally used the BSD-like names /dev/ptyxx for
443 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
444 has a number of problems. The GNU C library glibc 2.1 and later,
445 however, supports the Unix98 naming standard: in order to acquire a
446 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
447 terminal is then made available to the process and the pseudo
448 terminal slave can be accessed as /dev/pts/<number>. What was
449 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
451 All modern Linux systems use the Unix98 ptys. Say Y unless
452 you're on an embedded system and want to conserve memory.
454 config DEVPTS_MULTIPLE_INSTANCES
455 bool "Support multiple instances of devpts"
456 depends on UNIX98_PTYS
459 Enable support for multiple instances of devpts filesystem.
460 If you want to have isolated PTY namespaces (eg: in containers),
461 say Y here. Otherwise, say N. If enabled, each mount of devpts
462 filesystem with the '-o newinstance' option will create an
463 independent PTY namespace.
466 bool "Legacy (BSD) PTY support"
469 A pseudo terminal (PTY) is a software device consisting of two
470 halves: a master and a slave. The slave device behaves identical to
471 a physical terminal; the master device is used by a process to
472 read data from and write data to the slave, thereby emulating a
473 terminal. Typical programs for the master side are telnet servers
476 Linux has traditionally used the BSD-like names /dev/ptyxx
477 for masters and /dev/ttyxx for slaves of pseudo
478 terminals. This scheme has a number of problems, including
479 security. This option enables these legacy devices; on most
480 systems, it is safe to say N.
483 config LEGACY_PTY_COUNT
484 int "Maximum number of legacy PTY in use"
485 depends on LEGACY_PTYS
489 The maximum number of legacy PTYs that can be used at any one time.
490 The default is 256, and should be more than enough. Embedded
491 systems may want to reduce this to save memory.
493 When not in use, each legacy PTY occupies 12 bytes on 32-bit
494 architectures and 24 bytes on 64-bit architectures.
497 bool "TTY driver to output user messages via printk"
501 If you say Y here, the support for writing user messages (i.e.
502 console messages) via printk is available.
504 The feature is useful to inline user messages with kernel
506 In order to use this feature, you should output user messages
507 to /dev/ttyprintk or redirect console to this TTY.
512 tristate 'Total Impact briQ front panel driver'
515 The briQ is a small footprint CHRP computer with a frontpanel VFD, a
516 tristate led and two switches. It is the size of a CDROM drive.
518 If you have such one and want anything showing on the VFD then you
521 To compile this driver as a module, choose M here: the
522 module will be called briq_panel.
524 It's safe to say N here.
527 tristate "Blackfin On-Chip OTP Memory Support"
528 depends on BLACKFIN && (BF51x || BF52x || BF54x)
531 If you say Y here, you will get support for a character device
532 interface into the One Time Programmable memory pages that are
533 stored on the Blackfin processor. This will not get you access
534 to the secure memory pages however. You will need to write your
535 own secure code and reader for that.
537 To compile this driver as a module, choose M here: the module
538 will be called bfin-otp.
540 If unsure, it is safe to say Y.
542 config BFIN_OTP_WRITE_ENABLE
543 bool "Enable writing support of OTP pages"
547 If you say Y here, you will enable support for writing of the
548 OTP pages. This is dangerous by nature as you can only program
549 the pages once, so only enable this option when you actually
550 need it so as to not inadvertently clobber data.
555 tristate "Parallel printer support"
558 If you intend to attach a printer to the parallel port of your Linux
559 box (as opposed to using a serial printer; if the connector at the
560 printer has 9 or 25 holes ["female"], then it's serial), say Y.
561 Also read the Printing-HOWTO, available from
562 <http://www.tldp.org/docs.html#howto>.
564 It is possible to share one parallel port among several devices
565 (e.g. printer and ZIP drive) and it is safe to compile the
566 corresponding drivers into the kernel.
568 To compile this driver as a module, choose M here and read
569 <file:Documentation/parport.txt>. The module will be called lp.
571 If you have several parallel ports, you can specify which ports to
572 use with the "lp" kernel command line option. (Try "man bootparam"
573 or see the documentation of your boot loader (lilo or loadlin) about
574 how to pass options to the kernel at boot time.) The syntax of the
575 "lp" command line option can be found in <file:drivers/char/lp.c>.
577 If you have more than 8 printers, you need to increase the LP_NO
578 macro in lp.c and the PARPORT_MAX macro in parport.h.
581 bool "Support for console on line printer"
584 If you want kernel messages to be printed out as they occur, you
585 can have a console on the printer. This option adds support for
586 doing that; to actually get it to happen you need to pass the
587 option "console=lp0" to the kernel at boot time.
589 If the printer is out of paper (or off, or unplugged, or too
590 busy..) the kernel will stall until the printer is ready again.
591 By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
592 can make the kernel continue when this happens,
593 but it'll lose the kernel messages.
598 tristate "Support for user-space parallel port device drivers"
601 Saying Y to this adds support for /dev/parport device nodes. This
602 is needed for programs that want portable access to the parallel
603 port, for instance deviceid (which displays Plug-and-Play device
606 This is the parallel port equivalent of SCSI generic support (sg).
607 It is safe to say N to this -- it is not needed for normal printing
608 or parallel port CD-ROM/disk support.
610 To compile this driver as a module, choose M here: the
611 module will be called ppdev.
618 Generic "hypervisor virtual console" infrastructure for various
619 hypervisors (pSeries, iSeries, Xen, lguest).
620 It will automatically be selected if one of the back-end console drivers
627 bool "pSeries Hypervisor Virtual Console support"
628 depends on PPC_PSERIES
632 pSeries machines when partitioned support a hypervisor virtual
633 console. This driver allows each pSeries partition to have a console
634 which is accessed via the HMC.
637 bool "iSeries Hypervisor Virtual Console support"
638 depends on PPC_ISERIES
644 iSeries machines support a hypervisor virtual console.
647 bool "IBM RTAS Console support"
651 IBM Console device driver which makes use of RTAS
654 bool "Toshiba's Beat Hypervisor Console support"
655 depends on PPC_CELLEB
658 Toshiba's Cell Reference Set Beat Console device driver
661 bool "z/VM IUCV Hypervisor console support (VM only)"
667 This driver provides a Hypervisor console (HVC) back-end to access
668 a Linux (console) terminal via a z/VM IUCV communication path.
671 bool "Xen Hypervisor Console support"
677 Xen virtual console device driver
680 bool "udbg based fake hypervisor console"
681 depends on PPC && EXPERIMENTAL
686 bool "ARM JTAG DCC console"
690 This console uses the JTAG DCC on ARM to create a console under the HVC
691 driver. This console is used through a JTAG only on ARM. If you don't have
692 a JTAG then you probably don't want this option.
694 config VIRTIO_CONSOLE
695 tristate "Virtio console"
699 Virtio console for use with lguest and other hypervisors.
701 Also serves as a general-purpose serial device for data
702 transfer between the guest and host. Character devices at
703 /dev/vportNpn will be created when corresponding ports are
704 found, where N is the device number and n is the port number
705 within that device. If specified by the host, a sysfs
706 attribute called 'name' will be populated with a name for
707 the port which can be used by udev scripts to create a
708 symlink to the device.
711 tristate "IBM Hypervisor Virtual Console Server support"
712 depends on PPC_PSERIES && HVC_CONSOLE
714 Partitionable IBM Power5 ppc64 machines allow hosting of
715 firmware virtual consoles from one Linux partition by
716 another Linux partition. This driver allows console data
717 from Linux partitions to be accessed through TTY device
718 interfaces in the device tree of a Linux partition running
721 To compile this driver as a module, choose M here: the
722 module will be called hvcs. Additionally, this module
723 will depend on arch specific APIs exported from hvcserver.ko
724 which will also be compiled when this driver is built as a
728 tristate "IBM POWER Barrier Synchronization Register support"
729 depends on PPC_PSERIES
731 This devices exposes a hardware mechanism for fast synchronization
732 of threads across a large system which avoids bouncing a cacheline
733 between several cores on a system
735 source "drivers/char/ipmi/Kconfig"
738 tristate "NetWinder thermometer support"
739 depends on ARCH_NETWINDER
741 Say Y here to include support for the thermal management hardware
742 found in the NetWinder. This driver allows the user to control the
743 temperature set points and to read the current temperature.
745 It is also possible to say M here to build it as a module (ds1620)
746 It is recommended to be used on a NetWinder, but it is not a
750 tristate "NetWinder Button"
751 depends on ARCH_NETWINDER
753 If you say Y here and create a character device node /dev/nwbutton
754 with major and minor numbers 10 and 158 ("man mknod"), then every
755 time the orange button is pressed a number of times, the number of
756 times the button was pressed will be written to that device.
758 This is most useful for applications, as yet unwritten, which
759 perform actions based on how many times the button is pressed in a
762 Do not hold the button down for too long, as the driver does not
763 alter the behaviour of the hardware reset circuitry attached to the
764 button; it will still execute a hard reset if the button is held
765 down for longer than approximately five seconds.
767 To compile this driver as a module, choose M here: the
768 module will be called nwbutton.
770 Most people will answer Y to this question and "Reboot Using Button"
771 below to be able to initiate a system shutdown from the button.
773 config NWBUTTON_REBOOT
774 bool "Reboot Using Button"
777 If you say Y here, then you will be able to initiate a system
778 shutdown and reboot by pressing the orange button a number of times.
779 The number of presses to initiate the shutdown is two by default,
780 but this can be altered by modifying the value of NUM_PRESSES_REBOOT
781 in nwbutton.h and recompiling the driver or, if you compile the
782 driver as a module, you can specify the number of presses at load
783 time with "insmod button reboot_count=<something>".
786 tristate "NetWinder flash support"
787 depends on ARCH_NETWINDER
789 If you say Y here and create a character device /dev/flash with
790 major 10 and minor 160 you can manipulate the flash ROM containing
791 the NetWinder firmware. Be careful as accidentally overwriting the
792 flash contents can render your computer unbootable. On no account
793 allow random users access to this device. :-)
795 To compile this driver as a module, choose M here: the
796 module will be called nwflash.
798 If you're not sure, say N.
800 source "drivers/char/hw_random/Kconfig"
803 tristate "/dev/nvram support"
804 depends on ATARI || X86 || (ARM && RTC_DRV_CMOS) || GENERIC_NVRAM
806 If you say Y here and create a character special file /dev/nvram
807 with major number 10 and minor number 144 using mknod ("man mknod"),
808 you get read and write access to the extra bytes of non-volatile
809 memory in the real time clock (RTC), which is contained in every PC
810 and most Ataris. The actual number of bytes varies, depending on the
811 nvram in the system, but is usually 114 (128-14 for the RTC).
813 This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
814 on Ataris. /dev/nvram may be used to view settings there, or to
815 change them (with some utility). It could also be used to frequently
816 save a few bits of very important data that may not be lost over
817 power-off and for which writing to disk is too insecure. Note
818 however that most NVRAM space in a PC belongs to the BIOS and you
819 should NEVER idly tamper with it. See Ralf Brown's interrupt list
820 for a guide to the use of CMOS bytes by your BIOS.
822 On Atari machines, /dev/nvram is always configured and does not need
825 To compile this driver as a module, choose M here: the
826 module will be called nvram.
829 # These legacy RTC drivers just cause too many conflicts with the generic
830 # RTC framework ... let's not even try to coexist any more.
835 tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)"
836 depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV \
837 && !ARM && !SUPERH && !S390 && !AVR32 && !BLACKFIN
839 If you say Y here and create a character special file /dev/rtc with
840 major number 10 and minor number 135 using mknod ("man mknod"), you
841 will get access to the real time clock (or hardware clock) built
844 Every PC has such a clock built in. It can be used to generate
845 signals from as low as 1Hz up to 8192Hz, and can also be used
846 as a 24 hour alarm. It reports status information via the file
847 /proc/driver/rtc and its behaviour is set by various ioctls on
850 If you run Linux on a multiprocessor machine and said Y to
851 "Symmetric Multi Processing" above, you should say Y here to read
852 and set the RTC in an SMP compatible fashion.
854 If you think you have a use for such a device (such as periodic data
855 sampling), then say Y here, and read <file:Documentation/rtc.txt>
858 To compile this driver as a module, choose M here: the
859 module will be called rtc.
862 tristate "Enhanced Real Time Clock Support"
863 depends on SPARC32 && PCI
865 If you say Y here and create a character special file /dev/rtc with
866 major number 10 and minor number 135 using mknod ("man mknod"), you
867 will get access to the real time clock (or hardware clock) built
870 Every PC has such a clock built in. It can be used to generate
871 signals from as low as 1Hz up to 8192Hz, and can also be used
872 as a 24 hour alarm. It reports status information via the file
873 /proc/driver/rtc and its behaviour is set by various ioctls on
876 If you think you have a use for such a device (such as periodic data
877 sampling), then say Y here, and read <file:Documentation/rtc.txt>
880 To compile this driver as a module, choose M here: the
881 module will be called js-rtc.
884 tristate "Generic /dev/rtc emulation"
885 depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH && !AVR32 && !BLACKFIN
887 If you say Y here and create a character special file /dev/rtc with
888 major number 10 and minor number 135 using mknod ("man mknod"), you
889 will get access to the real time clock (or hardware clock) built
892 It reports status information via the file /proc/driver/rtc and its
893 behaviour is set by various ioctls on /dev/rtc. If you enable the
894 "extended RTC operation" below it will also provide an emulation
895 for RTC_UIE which is required by some programs and may improve
896 precision in some cases.
898 To compile this driver as a module, choose M here: the
899 module will be called genrtc.
902 bool "Extended RTC operation"
905 Provides an emulation for RTC_UIE which is required by some programs
906 and may improve precision of the generic RTC support in some cases.
909 bool "EFI Real Time Clock Services"
913 tristate "DS1302 RTC support"
914 depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
916 If you say Y here and create a character special file /dev/rtc with
917 major number 121 and minor number 0 using mknod ("man mknod"), you
918 will get access to the real time clock (or hardware clock) built
924 tristate "Double Talk PC internal speech card support"
927 This driver is for the DoubleTalk PC, a speech synthesizer
928 manufactured by RC Systems (<http://www.rcsys.com/>). It is also
929 called the `internal DoubleTalk'.
931 To compile this driver as a module, choose M here: the
932 module will be called dtlk.
935 tristate "Xilinx HWICAP Support"
936 depends on XILINX_VIRTEX || MICROBLAZE
938 This option enables support for Xilinx Internal Configuration
939 Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex
940 FPGA platforms to partially reconfigure the FPGA at runtime.
945 tristate "Siemens R3964 line discipline"
947 This driver allows synchronous communication with devices using the
948 Siemens R3964 packet protocol. Unless you are dealing with special
949 hardware like PLCs, you are unlikely to need this.
951 To compile this driver as a module, choose M here: the
952 module will be called n_r3964.
957 tristate "Applicom intelligent fieldbus card support"
960 This driver provides the kernel-side support for the intelligent
961 fieldbus cards made by Applicom International. More information
962 about these cards can be found on the WWW at the address
963 <http://www.applicom-int.com/>, or by email from David Woodhouse
964 <dwmw2@infradead.org>.
966 To compile this driver as a module, choose M here: the
967 module will be called applicom.
972 tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
973 depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
975 This driver enables access to the Sony Programmable I/O Control
976 Device which can be found in many (all ?) Sony Vaio laptops.
978 If you have one of those laptops, read
979 <file:Documentation/laptops/sonypi.txt>, and say Y or M here.
981 To compile this driver as a module, choose M here: the
982 module will be called sonypi.
985 tristate "TANBAC TB0219 GPIO support"
986 depends on TANBAC_TB022X
989 source "drivers/char/pcmcia/Kconfig"
992 tristate "ACP Modem (Mwave) support"
996 The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
997 kernel driver and a user level application. Together these components
998 support direct attachment to public switched telephone networks (PSTNs)
999 and support selected world wide countries.
1001 This version of the ACP Modem driver supports the IBM Thinkpad 600E,
1002 600, and 770 that include on board ACP modem hardware.
1004 The modem also supports the standard communications port interface
1005 (ttySx) and is compatible with the Hayes AT Command Set.
1007 The user level application needed to use this driver can be found at
1008 the IBM Linux Technology Center (LTC) web site:
1009 <http://www.ibm.com/linux/ltc/>.
1011 If you own one of the above IBM Thinkpads which has the Mwave chipset
1014 To compile this driver as a module, choose M here: the
1015 module will be called mwave.
1018 tristate "NatSemi SCx200 GPIO Support"
1022 Give userspace access to the GPIO pins on the National
1023 Semiconductor SCx200 processors.
1025 If compiled as a module, it will be called scx200_gpio.
1028 tristate "NatSemi PC8736x GPIO Support"
1030 default SCx200_GPIO # mostly N
1031 select NSC_GPIO # needed for support routines
1033 Give userspace access to the GPIO pins on the National
1034 Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
1035 has multiple functional units, inc several managed by
1036 hwmon/pc87360 driver. Tested with PC-87366
1038 If compiled as a module, it will be called pc8736x_gpio.
1041 tristate "NatSemi Base GPIO Support"
1043 # selected by SCx200_GPIO and PC8736x_GPIO
1044 # what about 2 selectors differing: m != y
1046 Common support used (and needed) by scx200_gpio and
1047 pc8736x_gpio drivers. If those drivers are built as
1048 modules, this one will be too, named nsc_gpio
1051 tristate "RAW driver (/dev/raw/rawN)"
1054 The raw driver permits block devices to be bound to /dev/raw/rawN.
1055 Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
1056 See the raw(8) manpage for more details.
1058 Applications should preferably open the device (eg /dev/hda1)
1059 with the O_DIRECT flag.
1062 int "Maximum number of RAW devices to support (1-8192)"
1063 depends on RAW_DRIVER
1066 The maximum number of RAW devices that are supported.
1067 Default is 256. Increase this number in case you need lots of
1071 bool "HPET - High Precision Event Timer" if (X86 || IA64)
1075 If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
1076 open selects one of the timers supported by the HPET. The timers are
1077 non-periodic and/or periodic.
1080 bool "Allow mmap of HPET"
1084 If you say Y here, user applications will be able to mmap
1087 In some hardware implementations, the page containing HPET
1088 registers may also contain other things that shouldn't be
1089 exposed to the user. If this applies to your hardware,
1092 config HANGCHECK_TIMER
1093 tristate "Hangcheck timer"
1094 depends on X86 || IA64 || PPC64 || S390
1096 The hangcheck-timer module detects when the system has gone
1097 out to lunch past a certain margin. It can reboot the system
1098 or merely print a warning.
1101 tristate "MMTIMER Memory mapped RTC for SGI Altix"
1102 depends on IA64_GENERIC || IA64_SGI_SN2
1105 The mmtimer device allows direct userspace access to the
1109 tristate "UV_MMTIMER Memory mapped RTC for SGI UV"
1113 The uv_mmtimer device allows direct userspace access to the
1116 source "drivers/char/tpm/Kconfig"
1119 tristate "Telecom clock driver for ATCA SBC"
1120 depends on EXPERIMENTAL && X86
1123 The telecom clock device is specific to the MPCBL0010 and MPCBL0050
1124 ATCA computers and allows direct userspace access to the
1125 configuration of the telecom clock configuration settings. This
1126 device is used for hardware synchronization across the ATCA backplane
1127 fabric. Upon loading, the driver exports a sysfs directory,
1128 /sys/devices/platform/telco_clock, with a number of files for
1129 controlling the behavior of this hardware.
1134 depends on ISA || PCI
1137 source "drivers/s390/char/Kconfig"
1140 tristate "Log panic/oops to a RAM buffer"
1141 depends on HAS_IOMEM
1144 This enables panic and oops messages to be logged to a circular
1145 buffer in RAM where it can be read back at some later point.
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