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#
# Character device configuration
#
menu "Character devices"
config VT
bool "Virtual terminal" if EMBEDDED
depends on !S390
select INPUT
default y
---help---
If you say Y here, you will get support for terminal devices with
display and keyboard devices. These are called "virtual" because you
can run several virtual terminals (also called virtual consoles) on
one physical terminal. This is rather useful, for example one
virtual terminal can collect system messages and warnings, another
one can be used for a text-mode user session, and a third could run
an X session, all in parallel. Switching between virtual terminals
is done with certain key combinations, usually Alt-<function key>.
The setterm command ("man setterm") can be used to change the
properties (such as colors or beeping) of a virtual terminal. The
man page console_codes(4) ("man console_codes") contains the special
character sequences that can be used to change those properties
directly. The fonts used on virtual terminals can be changed with
the setfont ("man setfont") command and the key bindings are defined
with the loadkeys ("man loadkeys") command.
You need at least one virtual terminal device in order to make use
of your keyboard and monitor. Therefore, only people configuring an
embedded system would want to say N here in order to save some
memory; the only way to log into such a system is then via a serial
or network connection.
If unsure, say Y, or else you won't be able to do much with your new
shiny Linux system :-)
config CONSOLE_TRANSLATIONS
depends on VT
default y
bool "Enable character translations in console" if EMBEDDED
---help---
This enables support for font mapping and Unicode translation
on virtual consoles.
config VT_CONSOLE
bool "Support for console on virtual terminal" if EMBEDDED
depends on VT
default y
---help---
The system console is the device which receives all kernel messages
and warnings and which allows logins in single user mode. If you
answer Y here, a virtual terminal (the device used to interact with
a physical terminal) can be used as system console. This is the most
common mode of operations, so you should say Y here unless you want
the kernel messages be output only to a serial port (in which case
you should say Y to "Console on serial port", below).
If you do say Y here, by default the currently visible virtual
terminal (/dev/tty0) will be used as system console. You can change
that with a kernel command line option such as "console=tty3" which
would use the third virtual terminal as system console. (Try "man
bootparam" or see the documentation of your boot loader (lilo or
loadlin) about how to pass options to the kernel at boot time.)
If unsure, say Y.
config HW_CONSOLE
bool
depends on VT && !S390 && !UML
default y
config VT_HW_CONSOLE_BINDING
bool "Support for binding and unbinding console drivers"
depends on HW_CONSOLE
default n
---help---
The virtual terminal is the device that interacts with the physical
terminal through console drivers. On these systems, at least one
console driver is loaded. In other configurations, additional console
drivers may be enabled, such as the framebuffer console. If more than
1 console driver is enabled, setting this to 'y' will allow you to
select the console driver that will serve as the backend for the
virtual terminals.
See <file:Documentation/console/console.txt> for more
information. For framebuffer console users, please refer to
<file:Documentation/fb/fbcon.txt>.
config DEVKMEM
bool "/dev/kmem virtual device support"
default y
help
Say Y here if you want to support the /dev/kmem device. The
/dev/kmem device is rarely used, but can be used for certain
kind of kernel debugging operations.
When in doubt, say "N".
config SERIAL_NONSTANDARD
bool "Non-standard serial port support"
depends on HAS_IOMEM
---help---
Say Y here if you have any non-standard serial boards -- boards
which aren't supported using the standard "dumb" serial driver.
This includes intelligent serial boards such as Cyclades,
Digiboards, etc. These are usually used for systems that need many
serial ports because they serve many terminals or dial-in
connections.
Note that the answer to this question won't directly affect the
kernel: saying N will just cause the configurator to skip all
the questions about non-standard serial boards.
Most people can say N here.
config COMPUTONE
tristate "Computone IntelliPort Plus serial support"
depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
---help---
This driver supports the entire family of Intelliport II/Plus
controllers with the exception of the MicroChannel controllers and
products previous to the Intelliport II. These are multiport cards,
which give you many serial ports. You would need something like this
to connect more than two modems to your Linux box, for instance in
order to become a dial-in server. If you have a card like that, say
Y here and read <file:Documentation/serial/computone.txt>.
To compile this driver as module, choose M here: the
module will be called ip2.
config ROCKETPORT
tristate "Comtrol RocketPort support"
depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
help
This driver supports Comtrol RocketPort and RocketModem PCI boards.
These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
modems. For information about the RocketPort/RocketModem boards
and this driver read <file:Documentation/serial/rocket.txt>.
To compile this driver as a module, choose M here: the
module will be called rocket.
If you want to compile this driver into the kernel, say Y here. If
you don't have a Comtrol RocketPort/RocketModem card installed, say N.
config CYCLADES
tristate "Cyclades async mux support"
depends on SERIAL_NONSTANDARD && (PCI || ISA)
select FW_LOADER
---help---
This driver supports Cyclades Z and Y multiserial boards.
You would need something like this to connect more than two modems to
your Linux box, for instance in order to become a dial-in server.
For information about the Cyclades-Z card, read
<file:Documentation/serial/README.cycladesZ>.
To compile this driver as a module, choose M here: the
module will be called cyclades.
If you haven't heard about it, it's safe to say N.
config CYZ_INTR
bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
depends on EXPERIMENTAL && CYCLADES
help
The Cyclades-Z family of multiport cards allows 2 (two) driver op
modes: polling and interrupt. In polling mode, the driver will check
the status of the Cyclades-Z ports every certain amount of time
(which is called polling cycle and is configurable). In interrupt
mode, it will use an interrupt line (IRQ) in order to check the
status of the Cyclades-Z ports. The default op mode is polling. If
unsure, say N.
config DIGIEPCA
tristate "Digiboard Intelligent Async Support"
depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
---help---
This is a driver for Digi International's Xx, Xeve, and Xem series
of cards which provide multiple serial ports. You would need
something like this to connect more than two modems to your Linux
box, for instance in order to become a dial-in server. This driver
supports the original PC (ISA) boards as well as PCI, and EISA. If
you have a card like this, say Y here and read the file
<file:Documentation/serial/digiepca.txt>.
To compile this driver as a module, choose M here: the
module will be called epca.
config ESPSERIAL
tristate "Hayes ESP serial port support"
depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API && BROKEN
help
This is a driver which supports Hayes ESP serial ports. Both single
port cards and multiport cards are supported. Make sure to read
<file:Documentation/hayes-esp.txt>.
To compile this driver as a module, choose M here: the
module will be called esp.
If unsure, say N.
config MOXA_INTELLIO
tristate "Moxa Intellio support"
depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
select FW_LOADER
help
Say Y here if you have a Moxa Intellio multiport serial card.
To compile this driver as a module, choose M here: the
module will be called moxa.
config MOXA_SMARTIO
tristate "Moxa SmartIO support v. 2.0"
depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
help
Say Y here if you have a Moxa SmartIO multiport serial card and/or
want to help develop a new version of this driver.
This is upgraded (1.9.1) driver from original Moxa drivers with
changes finally resulting in PCI probing.
This driver can also be built as a module. The module will be called
mxser. If you want to do that, say M here.
config ISI
tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
depends on SERIAL_NONSTANDARD && PCI
select FW_LOADER
help
This is a driver for the Multi-Tech cards which provide several
serial ports. The driver is experimental and can currently only be
built as a module. The module will be called isicom.
If you want to do that, choose M here.
config SYNCLINK
tristate "Microgate SyncLink card support"
depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
help
Provides support for the SyncLink ISA and PCI multiprotocol serial
adapters. These adapters support asynchronous and HDLC bit
synchronous communication up to 10Mbps (PCI adapter).
This driver can only be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called synclink. If you want to do that, say M
here.
config SYNCLINKMP
tristate "SyncLink Multiport support"
depends on SERIAL_NONSTANDARD && PCI
help
Enable support for the SyncLink Multiport (2 or 4 ports)
serial adapter, running asynchronous and HDLC communications up
to 2.048Mbps. Each ports is independently selectable for
RS-232, V.35, RS-449, RS-530, and X.21
This driver may be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called synclinkmp. If you want to do that, say M
here.
config SYNCLINK_GT
tristate "SyncLink GT/AC support"
depends on SERIAL_NONSTANDARD && PCI
help
Support for SyncLink GT and SyncLink AC families of
synchronous and asynchronous serial adapters
manufactured by Microgate Systems, Ltd. (www.microgate.com)
config N_HDLC
tristate "HDLC line discipline support"
depends on SERIAL_NONSTANDARD
help
Allows synchronous HDLC communications with tty device drivers that
support synchronous HDLC such as the Microgate SyncLink adapter.
This driver can only be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called n_hdlc. If you want to do that, say M
here.
config RISCOM8
tristate "SDL RISCom/8 card support"
depends on SERIAL_NONSTANDARD
help
This is a driver for the SDL Communications RISCom/8 multiport card,
which gives you many serial ports. You would need something like
this to connect more than two modems to your Linux box, for instance
in order to become a dial-in server. If you have a card like that,
say Y here and read the file <file:Documentation/serial/riscom8.txt>.
Also it's possible to say M here and compile this driver as kernel
loadable module; the module will be called riscom8.
config SPECIALIX
tristate "Specialix IO8+ card support"
depends on SERIAL_NONSTANDARD
help
This is a driver for the Specialix IO8+ multiport card (both the
ISA and the PCI version) which gives you many serial ports. You
would need something like this to connect more than two modems to
your Linux box, for instance in order to become a dial-in server.
If you have a card like that, say Y here and read the file
<file:Documentation/serial/specialix.txt>. Also it's possible to say
M here and compile this driver as kernel loadable module which will be
called specialix.
config SX
tristate "Specialix SX (and SI) card support"
depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
help
This is a driver for the SX and SI multiport serial cards.
Please read the file <file:Documentation/serial/sx.txt> for details.
This driver can only be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called sx. If you want to do that, say M here.
config RIO
tristate "Specialix RIO system support"
depends on SERIAL_NONSTANDARD
help
This is a driver for the Specialix RIO, a smart serial card which
drives an outboard box that can support up to 128 ports. Product
information is at <http://www.perle.com/support/documentation.html#multiport>.
There are both ISA and PCI versions.
config RIO_OLDPCI
bool "Support really old RIO/PCI cards"
depends on RIO
help
Older RIO PCI cards need some initialization-time configuration to
determine the IRQ and some control addresses. If you have a RIO and
this doesn't seem to work, try setting this to Y.
config STALDRV
bool "Stallion multiport serial support"
depends on SERIAL_NONSTANDARD
help
Stallion cards give you many serial ports. You would need something
like this to connect more than two modems to your Linux box, for
instance in order to become a dial-in server. If you say Y here,
you will be asked for your specific card model in the next
questions. Make sure to read <file:Documentation/serial/stallion.txt>
in this case. If you have never heard about all this, it's safe to
say N.
config STALLION
tristate "Stallion EasyIO or EC8/32 support"
depends on STALDRV && (ISA || EISA || PCI)
help
If you have an EasyIO or EasyConnection 8/32 multiport Stallion
card, then this is for you; say Y. Make sure to read
<file:Documentation/serial/stallion.txt>.
To compile this driver as a module, choose M here: the
module will be called stallion.
config ISTALLION
tristate "Stallion EC8/64, ONboard, Brumby support"
depends on STALDRV && (ISA || EISA || PCI)
help
If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
serial multiport card, say Y here. Make sure to read
<file:Documentation/serial/stallion.txt>.
To compile this driver as a module, choose M here: the
module will be called istallion.
config NOZOMI
tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
depends on PCI && EXPERIMENTAL
help
If you have a HSDPA driver Broadband Wireless Data Card -
Globe Trotter PCMCIA card, say Y here.
To compile this driver as a module, choose M here, the module
will be called nozomi.
config A2232
tristate "Commodore A2232 serial support (EXPERIMENTAL)"
depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
---help---
This option supports the 2232 7-port serial card shipped with the
Amiga 2000 and other Zorro-bus machines, dating from 1989. At
a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
ports were connected with 8 pin DIN connectors on the card bracket,
for which 8 pin to DB25 adapters were supplied. The card also had
jumpers internally to toggle various pinning configurations.
This driver can be built as a module; but then "generic_serial"
will also be built as a module. This has to be loaded before
"ser_a2232". If you want to do this, answer M here.
config SGI_SNSC
bool "SGI Altix system controller communication support"
depends on (IA64_SGI_SN2 || IA64_GENERIC)
help
If you have an SGI Altix and you want to enable system
controller communication from user space (you want this!),
say Y. Otherwise, say N.
config SGI_TIOCX
bool "SGI TIO CX driver support"
depends on (IA64_SGI_SN2 || IA64_GENERIC)
help
If you have an SGI Altix and you have fpga devices attached
to your TIO, say Y here, otherwise say N.
config SGI_MBCS
tristate "SGI FPGA Core Services driver support"
depends on SGI_TIOCX
help
If you have an SGI Altix with an attached SABrick
say Y or M here, otherwise say N.
source "drivers/serial/Kconfig"
config UNIX98_PTYS
bool "Unix98 PTY support" if EMBEDDED
default y
---help---
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
read data from and write data to the slave, thereby emulating a
terminal. Typical programs for the master side are telnet servers
and xterms.
Linux has traditionally used the BSD-like names /dev/ptyxx for
masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
has a number of problems. The GNU C library glibc 2.1 and later,
however, supports the Unix98 naming standard: in order to acquire a
pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
terminal is then made available to the process and the pseudo
terminal slave can be accessed as /dev/pts/<number>. What was
traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
All modern Linux systems use the Unix98 ptys. Say Y unless
you're on an embedded system and want to conserve memory.
config DEVPTS_MULTIPLE_INSTANCES
bool "Support multiple instances of devpts"
depends on UNIX98_PTYS
default n
---help---
Enable support for multiple instances of devpts filesystem.
If you want to have isolated PTY namespaces (eg: in containers),
say Y here. Otherwise, say N. If enabled, each mount of devpts
filesystem with the '-o newinstance' option will create an
independent PTY namespace.
config LEGACY_PTYS
bool "Legacy (BSD) PTY support"
default y
---help---
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
read data from and write data to the slave, thereby emulating a
terminal. Typical programs for the master side are telnet servers
and xterms.
Linux has traditionally used the BSD-like names /dev/ptyxx
for masters and /dev/ttyxx for slaves of pseudo
terminals. This scheme has a number of problems, including
security. This option enables these legacy devices; on most
systems, it is safe to say N.
config LEGACY_PTY_COUNT
int "Maximum number of legacy PTY in use"
depends on LEGACY_PTYS
range 0 256
default "256"
---help---
The maximum number of legacy PTYs that can be used at any one time.
The default is 256, and should be more than enough. Embedded
systems may want to reduce this to save memory.
When not in use, each legacy PTY occupies 12 bytes on 32-bit
architectures and 24 bytes on 64-bit architectures.
config BRIQ_PANEL
tristate 'Total Impact briQ front panel driver'
depends on PPC_CHRP
---help---
The briQ is a small footprint CHRP computer with a frontpanel VFD, a
tristate led and two switches. It is the size of a CDROM drive.
If you have such one and want anything showing on the VFD then you
must answer Y here.
To compile this driver as a module, choose M here: the
module will be called briq_panel.
It's safe to say N here.
config BFIN_OTP
tristate "Blackfin On-Chip OTP Memory Support"
depends on BLACKFIN && (BF52x || BF54x)
default y
help
If you say Y here, you will get support for a character device
interface into the One Time Programmable memory pages that are
stored on the Blackfin processor. This will not get you access
to the secure memory pages however. You will need to write your
own secure code and reader for that.
To compile this driver as a module, choose M here: the module
will be called bfin-otp.
If unsure, it is safe to say Y.
config BFIN_OTP_WRITE_ENABLE
bool "Enable writing support of OTP pages"
depends on BFIN_OTP
default n
help
If you say Y here, you will enable support for writing of the
OTP pages. This is dangerous by nature as you can only program
the pages once, so only enable this option when you actually
need it so as to not inadvertently clobber data.
If unsure, say N.
config PRINTER
tristate "Parallel printer support"
depends on PARPORT
---help---
If you intend to attach a printer to the parallel port of your Linux
box (as opposed to using a serial printer; if the connector at the
printer has 9 or 25 holes ["female"], then it's serial), say Y.
Also read the Printing-HOWTO, available from
<http://www.tldp.org/docs.html#howto>.
It is possible to share one parallel port among several devices
(e.g. printer and ZIP drive) and it is safe to compile the
corresponding drivers into the kernel.
To compile this driver as a module, choose M here and read
<file:Documentation/parport.txt>. The module will be called lp.
If you have several parallel ports, you can specify which ports to
use with the "lp" kernel command line option. (Try "man bootparam"
or see the documentation of your boot loader (lilo or loadlin) about
how to pass options to the kernel at boot time.) The syntax of the
"lp" command line option can be found in <file:drivers/char/lp.c>.
If you have more than 8 printers, you need to increase the LP_NO
macro in lp.c and the PARPORT_MAX macro in parport.h.
config LP_CONSOLE
bool "Support for console on line printer"
depends on PRINTER
---help---
If you want kernel messages to be printed out as they occur, you
can have a console on the printer. This option adds support for
doing that; to actually get it to happen you need to pass the
option "console=lp0" to the kernel at boot time.
If the printer is out of paper (or off, or unplugged, or too
busy..) the kernel will stall until the printer is ready again.
By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
can make the kernel continue when this happens,
but it'll lose the kernel messages.
If unsure, say N.
config PPDEV
tristate "Support for user-space parallel port device drivers"
depends on PARPORT
---help---
Saying Y to this adds support for /dev/parport device nodes. This
is needed for programs that want portable access to the parallel
port, for instance deviceid (which displays Plug-and-Play device
IDs).
This is the parallel port equivalent of SCSI generic support (sg).
It is safe to say N to this -- it is not needed for normal printing
or parallel port CD-ROM/disk support.
To compile this driver as a module, choose M here: the
module will be called ppdev.
If unsure, say N.
config HVC_DRIVER
bool
help
Generic "hypervisor virtual console" infrastructure for various
hypervisors (pSeries, iSeries, Xen, lguest).
It will automatically be selected if one of the back-end console drivers
is selected.
config HVC_IRQ
bool
config HVC_CONSOLE
bool "pSeries Hypervisor Virtual Console support"
depends on PPC_PSERIES
select HVC_DRIVER
select HVC_IRQ
help
pSeries machines when partitioned support a hypervisor virtual
console. This driver allows each pSeries partition to have a console
which is accessed via the HMC.
config HVC_ISERIES
bool "iSeries Hypervisor Virtual Console support"
depends on PPC_ISERIES
default y
select HVC_DRIVER
select HVC_IRQ
select VIOPATH
help
iSeries machines support a hypervisor virtual console.
config HVC_RTAS
bool "IBM RTAS Console support"
depends on PPC_RTAS
select HVC_DRIVER
help
IBM Console device driver which makes use of RTAS
config HVC_BEAT
bool "Toshiba's Beat Hypervisor Console support"
depends on PPC_CELLEB
select HVC_DRIVER
help
Toshiba's Cell Reference Set Beat Console device driver
config HVC_IUCV
bool "z/VM IUCV Hypervisor console support (VM only)"
depends on S390
select HVC_DRIVER
select IUCV
default y
help
This driver provides a Hypervisor console (HVC) back-end to access
a Linux (console) terminal via a z/VM IUCV communication path.
config HVC_XEN
bool "Xen Hypervisor Console support"
depends on XEN
select HVC_DRIVER
select HVC_IRQ
default y
help
Xen virtual console device driver
config HVC_UDBG
bool "udbg based fake hypervisor console"
depends on PPC && EXPERIMENTAL
select HVC_DRIVER
default n
config VIRTIO_CONSOLE
tristate "Virtio console"
depends on VIRTIO
select HVC_DRIVER
help
Virtio console for use with lguest and other hypervisors.
config HVCS
tristate "IBM Hypervisor Virtual Console Server support"
depends on PPC_PSERIES
help
Partitionable IBM Power5 ppc64 machines allow hosting of
firmware virtual consoles from one Linux partition by
another Linux partition. This driver allows console data
from Linux partitions to be accessed through TTY device
interfaces in the device tree of a Linux partition running
this driver.
To compile this driver as a module, choose M here: the
module will be called hvcs.ko. Additionally, this module
will depend on arch specific APIs exported from hvcserver.ko
which will also be compiled when this driver is built as a
module.
config IBM_BSR
tristate "IBM POWER Barrier Synchronization Register support"
depends on PPC_PSERIES
help
This devices exposes a hardware mechanism for fast synchronization
of threads across a large system which avoids bouncing a cacheline
between several cores on a system
source "drivers/char/ipmi/Kconfig"
config DS1620
tristate "NetWinder thermometer support"
depends on ARCH_NETWINDER
help
Say Y here to include support for the thermal management hardware
found in the NetWinder. This driver allows the user to control the
temperature set points and to read the current temperature.
It is also possible to say M here to build it as a module (ds1620)
It is recommended to be used on a NetWinder, but it is not a
necessity.
config NWBUTTON
tristate "NetWinder Button"
depends on ARCH_NETWINDER
---help---
If you say Y here and create a character device node /dev/nwbutton
with major and minor numbers 10 and 158 ("man mknod"), then every
time the orange button is pressed a number of times, the number of
times the button was pressed will be written to that device.
This is most useful for applications, as yet unwritten, which
perform actions based on how many times the button is pressed in a
row.
Do not hold the button down for too long, as the driver does not
alter the behaviour of the hardware reset circuitry attached to the
button; it will still execute a hard reset if the button is held
down for longer than approximately five seconds.
To compile this driver as a module, choose M here: the
module will be called nwbutton.
Most people will answer Y to this question and "Reboot Using Button"
below to be able to initiate a system shutdown from the button.
config NWBUTTON_REBOOT
bool "Reboot Using Button"
depends on NWBUTTON
help
If you say Y here, then you will be able to initiate a system
shutdown and reboot by pressing the orange button a number of times.
The number of presses to initiate the shutdown is two by default,
but this can be altered by modifying the value of NUM_PRESSES_REBOOT
in nwbutton.h and recompiling the driver or, if you compile the
driver as a module, you can specify the number of presses at load
time with "insmod button reboot_count=<something>".
config NWFLASH
tristate "NetWinder flash support"
depends on ARCH_NETWINDER
---help---
If you say Y here and create a character device /dev/flash with
major 10 and minor 160 you can manipulate the flash ROM containing
the NetWinder firmware. Be careful as accidentally overwriting the
flash contents can render your computer unbootable. On no account
allow random users access to this device. :-)
To compile this driver as a module, choose M here: the
module will be called nwflash.
If you're not sure, say N.
source "drivers/char/hw_random/Kconfig"
config NVRAM
tristate "/dev/nvram support"
depends on ATARI || X86 || (ARM && RTC_DRV_CMOS) || GENERIC_NVRAM
---help---
If you say Y here and create a character special file /dev/nvram
with major number 10 and minor number 144 using mknod ("man mknod"),
you get read and write access to the extra bytes of non-volatile
memory in the real time clock (RTC), which is contained in every PC
and most Ataris. The actual number of bytes varies, depending on the
nvram in the system, but is usually 114 (128-14 for the RTC).
This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
on Ataris. /dev/nvram may be used to view settings there, or to
change them (with some utility). It could also be used to frequently
save a few bits of very important data that may not be lost over
power-off and for which writing to disk is too insecure. Note
however that most NVRAM space in a PC belongs to the BIOS and you
should NEVER idly tamper with it. See Ralf Brown's interrupt list
for a guide to the use of CMOS bytes by your BIOS.
On Atari machines, /dev/nvram is always configured and does not need
to be selected.
To compile this driver as a module, choose M here: the
module will be called nvram.
#
# These legacy RTC drivers just cause too many conflicts with the generic
# RTC framework ... let's not even try to coexist any more.
#
if RTC_LIB=n
config RTC
tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)"
depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV \
&& !ARM && !SUPERH && !S390 && !AVR32
---help---
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
Every PC has such a clock built in. It can be used to generate
signals from as low as 1Hz up to 8192Hz, and can also be used
as a 24 hour alarm. It reports status information via the file
/proc/driver/rtc and its behaviour is set by various ioctls on
/dev/rtc.
If you run Linux on a multiprocessor machine and said Y to
"Symmetric Multi Processing" above, you should say Y here to read
and set the RTC in an SMP compatible fashion.
If you think you have a use for such a device (such as periodic data
sampling), then say Y here, and read <file:Documentation/rtc.txt>
for details.
To compile this driver as a module, choose M here: the
module will be called rtc.
config JS_RTC
tristate "Enhanced Real Time Clock Support"
depends on SPARC32 && PCI
---help---
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
Every PC has such a clock built in. It can be used to generate
signals from as low as 1Hz up to 8192Hz, and can also be used
as a 24 hour alarm. It reports status information via the file
/proc/driver/rtc and its behaviour is set by various ioctls on
/dev/rtc.
If you think you have a use for such a device (such as periodic data
sampling), then say Y here, and read <file:Documentation/rtc.txt>
for details.
To compile this driver as a module, choose M here: the
module will be called js-rtc.
config GEN_RTC
tristate "Generic /dev/rtc emulation"
depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH && !AVR32 && !BLACKFIN
---help---
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
It reports status information via the file /proc/driver/rtc and its
behaviour is set by various ioctls on /dev/rtc. If you enable the
"extended RTC operation" below it will also provide an emulation
for RTC_UIE which is required by some programs and may improve
precision in some cases.
To compile this driver as a module, choose M here: the
module will be called genrtc.
config GEN_RTC_X
bool "Extended RTC operation"
depends on GEN_RTC
help
Provides an emulation for RTC_UIE which is required by some programs
and may improve precision of the generic RTC support in some cases.
config EFI_RTC
bool "EFI Real Time Clock Services"
depends on IA64
config DS1302
tristate "DS1302 RTC support"
depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
help
If you say Y here and create a character special file /dev/rtc with
major number 121 and minor number 0 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
endif # RTC_LIB
config DTLK
tristate "Double Talk PC internal speech card support"
depends on ISA
help
This driver is for the DoubleTalk PC, a speech synthesizer
manufactured by RC Systems (<http://www.rcsys.com/>). It is also
called the `internal DoubleTalk'.
To compile this driver as a module, choose M here: the
module will be called dtlk.
config XILINX_HWICAP
tristate "Xilinx HWICAP Support"
depends on XILINX_VIRTEX
help
This option enables support for Xilinx Internal Configuration
Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex
FPGA platforms to partially reconfigure the FPGA at runtime.
If unsure, say N.
config R3964
tristate "Siemens R3964 line discipline"
---help---
This driver allows synchronous communication with devices using the
Siemens R3964 packet protocol. Unless you are dealing with special
hardware like PLCs, you are unlikely to need this.
To compile this driver as a module, choose M here: the
module will be called n_r3964.
If unsure, say N.
config APPLICOM
tristate "Applicom intelligent fieldbus card support"
depends on PCI
---help---
This driver provides the kernel-side support for the intelligent
fieldbus cards made by Applicom International. More information
about these cards can be found on the WWW at the address
<http://www.applicom-int.com/>, or by email from David Woodhouse
<dwmw2@infradead.org>.
To compile this driver as a module, choose M here: the
module will be called applicom.
If unsure, say N.
config SONYPI
tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
---help---
This driver enables access to the Sony Programmable I/O Control
Device which can be found in many (all ?) Sony Vaio laptops.
If you have one of those laptops, read
<file:Documentation/laptops/sonypi.txt>, and say Y or M here.
To compile this driver as a module, choose M here: the
module will be called sonypi.
config GPIO_TB0219
tristate "TANBAC TB0219 GPIO support"
depends on TANBAC_TB022X
select GPIO_VR41XX
source "drivers/char/pcmcia/Kconfig"
config MWAVE
tristate "ACP Modem (Mwave) support"
depends on X86
select SERIAL_8250
---help---
The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
kernel driver and a user level application. Together these components
support direct attachment to public switched telephone networks (PSTNs)
and support selected world wide countries.
This version of the ACP Modem driver supports the IBM Thinkpad 600E,
600, and 770 that include on board ACP modem hardware.
The modem also supports the standard communications port interface
(ttySx) and is compatible with the Hayes AT Command Set.
The user level application needed to use this driver can be found at
the IBM Linux Technology Center (LTC) web site:
<http://www.ibm.com/linux/ltc/>.
If you own one of the above IBM Thinkpads which has the Mwave chipset
in it, say Y.
To compile this driver as a module, choose M here: the
module will be called mwave.
config SCx200_GPIO
tristate "NatSemi SCx200 GPIO Support"
depends on SCx200
select NSC_GPIO
help
Give userspace access to the GPIO pins on the National
Semiconductor SCx200 processors.
If compiled as a module, it will be called scx200_gpio.
config PC8736x_GPIO
tristate "NatSemi PC8736x GPIO Support"
depends on X86
default SCx200_GPIO # mostly N
select NSC_GPIO # needed for support routines
help
Give userspace access to the GPIO pins on the National
Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
has multiple functional units, inc several managed by
hwmon/pc87360 driver. Tested with PC-87366
If compiled as a module, it will be called pc8736x_gpio.
config NSC_GPIO
tristate "NatSemi Base GPIO Support"
depends on X86_32
# selected by SCx200_GPIO and PC8736x_GPIO
# what about 2 selectors differing: m != y
help
Common support used (and needed) by scx200_gpio and
pc8736x_gpio drivers. If those drivers are built as
modules, this one will be too, named nsc_gpio
config CS5535_GPIO
tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
depends on X86_32
help
Give userspace access to the GPIO pins on the AMD CS5535 and
CS5536 Geode companion devices.
If compiled as a module, it will be called cs5535_gpio.
config GPIO_VR41XX
tristate "NEC VR4100 series General-purpose I/O Unit support"
depends on CPU_VR41XX
config RAW_DRIVER
tristate "RAW driver (/dev/raw/rawN)"
depends on BLOCK
help
The raw driver permits block devices to be bound to /dev/raw/rawN.
Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
See the raw(8) manpage for more details.
Applications should preferably open the device (eg /dev/hda1)
with the O_DIRECT flag.
config MAX_RAW_DEVS
int "Maximum number of RAW devices to support (1-8192)"
depends on RAW_DRIVER
default "256"
help
The maximum number of RAW devices that are supported.
Default is 256. Increase this number in case you need lots of
raw devices.
config HPET
bool "HPET - High Precision Event Timer" if (X86 || IA64)
default n
depends on ACPI
help
If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
open selects one of the timers supported by the HPET. The timers are
non-periodic and/or periodic.
config HPET_MMAP
bool "Allow mmap of HPET"
default y
depends on HPET
help
If you say Y here, user applications will be able to mmap
the HPET registers.
In some hardware implementations, the page containing HPET
registers may also contain other things that shouldn't be
exposed to the user. If this applies to your hardware,
say N here.
config HANGCHECK_TIMER
tristate "Hangcheck timer"
depends on X86 || IA64 || PPC64 || S390
help
The hangcheck-timer module detects when the system has gone
out to lunch past a certain margin. It can reboot the system
or merely print a warning.
config MMTIMER
tristate "MMTIMER Memory mapped RTC for SGI Altix"
depends on IA64_GENERIC || IA64_SGI_SN2
default y
help
The mmtimer device allows direct userspace access to the
Altix system timer.
source "drivers/char/tpm/Kconfig"
config TELCLOCK
tristate "Telecom clock driver for ATCA SBC"
depends on EXPERIMENTAL && X86
default n
help
The telecom clock device is specific to the MPCBL0010 and MPCBL0050
ATCA computers and allows direct userspace access to the
configuration of the telecom clock configuration settings. This
device is used for hardware synchronization across the ATCA backplane
fabric. Upon loading, the driver exports a sysfs directory,
/sys/devices/platform/telco_clock, with a number of files for
controlling the behavior of this hardware.
config DEVPORT
bool
depends on !M68K
depends on ISA || PCI
default y
source "drivers/s390/char/Kconfig"
endmenu
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