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# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
mainmenu "Linux Kernel Configuration"
config X86_32
default y
This is Linux's home port. Linux was originally native to the Intel
386, and runs on all the later x86 processors including the Intel
486, 586, Pentiums, and various instruction-set-compatible chips by
AMD, Cyrix, and others.
default y
default y
default y
default y
config X86
default y
config MMU
default y
config SBUS
default y
default y
default y
default y
config DMI
default y
source "init/Kconfig"
menu "Processor type and features"
config SMP
bool "Symmetric multi-processing support"
This enables support for systems with more than one CPU. If you have
a system with only one CPU, like most personal computers, say N. If
you have a system with more than one CPU, say Y.
If you say N here, the kernel will run on single and multiprocessor
machines, but will use only one CPU of a multiprocessor machine. If
you say Y here, the kernel will run on many, but not all,
singleprocessor machines. On a singleprocessor machine, the kernel
will run faster if you say N here.
Note that if you say Y here and choose architecture "586" or
"Pentium" under "Processor family", the kernel will not work on 486
architectures. Similarly, multiprocessor kernels for the "PPro"
architecture may not work on all Pentium based boards.
People using multiprocessor machines who say Y here should also say
Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
Management" code will be disabled if you say Y here.
See also the <file:Documentation/smp.txt>,
<file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
If you don't know what to do here, say N.
prompt "Subarchitecture Type"
default X86_PC
config X86_PC
bool "PC-compatible"
Choose this option if your computer is a standard PC or compatible.
config X86_ELAN
bool "AMD Elan"
Select this for an AMD Elan processor.
Do not use this option for K6/Athlon/Opteron processors!
If unsure, choose "PC-compatible" instead.
config X86_VOYAGER
bool "Voyager (NCR)"
Voyager is an MCA-based 32-way capable SMP architecture proprietary
to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
*** WARNING ***
If you do not specifically know you have a Voyager based machine,
say N here, otherwise the kernel you build will not be bootable.
config X86_NUMAQ
bool "NUMAQ (IBM/Sequent)"
select SMP
select NUMA
This option is used for getting Linux to run on a (IBM/Sequent) NUMA
multiquad box. This changes the way that processors are bootstrapped,
and uses Clustered Logical APIC addressing mode instead of Flat Logical.
You will need a new lynxer.elf file to flash your firmware with - send
email to <>.
config X86_SUMMIT
bool "Summit/EXA (IBM x440)"
depends on SMP
This option is needed for IBM systems that use the Summit/EXA chipset.
In particular, it is needed for the x440.
If you don't have one of these computers, you should say N here.
If you want to build a NUMA kernel, you must select ACPI.
config X86_BIGSMP
bool "Support for other sub-arch SMP systems with more than 8 CPUs"
depends on SMP
This option is needed for the systems that have more than 8 CPUs
and if the system is not of any sub-arch type above.
If you don't have such a system, you should say N here.
config X86_VISWS
bool "SGI 320/540 (Visual Workstation)"
The SGI Visual Workstation series is an IA32-based workstation
based on SGI systems chips with some legacy PC hardware attached.
Say Y here to create a kernel to run on the SGI 320 or 540.
A kernel compiled for the Visual Workstation will not run on PCs
and vice versa. See <file:Documentation/sgi-visws.txt> for details.
bool "Generic architecture (Summit, bigsmp, ES7000, default)"
depends on SMP
This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
It is intended for a generic binary kernel.
If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
config X86_ES7000
bool "Support for Unisys ES7000 IA32 series"
depends on SMP
Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
supposed to run on an IA32-based Unisys ES7000 system.
Only choose this option if you have such a system, otherwise you
should say N here.
config ACPI_SRAT
default y
depends on ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
select ACPI_NUMA
default y
depends on ACPI_SRAT
config X86_SUMMIT_NUMA
default y
depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
default y
depends on X86_SUMMIT || X86_GENERICARCH
default y
depends on SMP && X86_ES7000 && MPENTIUMIII
source "arch/i386/Kconfig.cpu"
bool "HPET Timer Support"
This enables the use of the HPET for the kernel's internal timer.
HPET is the next generation timer replacing legacy 8254s.
You can safely choose Y here. However, HPET will only be
activated if the platform and the BIOS support this feature.
Otherwise the 8254 will be used for timing services.
Choose N to continue using the legacy 8254 timer.
depends on HPET_TIMER && RTC=y
default y
config NR_CPUS
int "Maximum number of CPUs (2-255)"
range 2 255
depends on SMP
default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
default "8"
This allows you to specify the maximum number of CPUs which this
kernel will support. The maximum supported value is 255 and the
minimum value which makes sense is 2.
This is purely to save memory - each supported CPU adds
approximately eight kilobytes to the kernel image.
config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support"
depends on X86_HT
SMT scheduler support improves the CPU scheduler's decision making
when dealing with Intel Pentium 4 chips with HyperThreading at a
cost of slightly increased overhead in some places. If unsure say
N here.
config SCHED_MC
bool "Multi-core scheduler support"
depends on X86_HT
default y
Multi-core scheduler support improves the CPU scheduler's decision
making when dealing with multi-core CPU chips at a cost of slightly
increased overhead in some places. If unsure say N here.
source "kernel/Kconfig.preempt"
config X86_UP_APIC
bool "Local APIC support on uniprocessors"
depends on !SMP && !(X86_VISWS || X86_VOYAGER)
A local APIC (Advanced Programmable Interrupt Controller) is an
integrated interrupt controller in the CPU. If you have a single-CPU
system which has a processor with a local APIC, you can say Y here to
enable and use it. If you say Y here even though your machine doesn't
have a local APIC, then the kernel will still run with no slowdown at
all. The local APIC supports CPU-generated self-interrupts (timer,
performance counters), and the NMI watchdog which detects hard
config X86_UP_IOAPIC
bool "IO-APIC support on uniprocessors"
depends on X86_UP_APIC
An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
SMP-capable replacement for PC-style interrupt controllers. Most
SMP systems and many recent uniprocessor systems have one.
If you have a single-CPU system with an IO-APIC, you can say Y here
to use it. If you say Y here even though your machine doesn't have
an IO-APIC, then the kernel will still run with no slowdown at all.
config X86_LOCAL_APIC
depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER)
default y
config X86_IO_APIC
depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
default y
config X86_VISWS_APIC
depends on X86_VISWS
default y
config X86_MCE
bool "Machine Check Exception"
depends on !X86_VOYAGER
Machine Check Exception support allows the processor to notify the
kernel if it detects a problem (e.g. overheating, component failure).
The action the kernel takes depends on the severity of the problem,
ranging from a warning message on the console, to halting the machine.
Your processor must be a Pentium or newer to support this - check the
flags in /proc/cpuinfo for mce. Note that some older Pentium systems
have a design flaw which leads to false MCE events - hence MCE is
disabled on all P5 processors, unless explicitly enabled with "mce"
as a boot argument. Similarly, if MCE is built in and creates a
problem on some new non-standard machine, you can boot with "nomce"
to disable it. MCE support simply ignores non-MCE processors like
the 386 and 486, so nearly everyone can say Y here.
tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
depends on X86_MCE
Enabling this feature starts a timer that triggers every 5 seconds which
will look at the machine check registers to see if anything happened.
Non-fatal problems automatically get corrected (but still logged).
Disable this if you don't want to see these messages.
Seeing the messages this option prints out may be indicative of dying hardware,
or out-of-spec (ie, overclocked) hardware.
This option only does something on certain CPUs.
(AMD Athlon/Duron and Intel Pentium 4)
config X86_MCE_P4THERMAL
bool "check for P4 thermal throttling interrupt."
depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
Enabling this feature will cause a message to be printed when the P4
enters thermal throttling.
config VM86
default y
bool "Enable VM86 support" if EMBEDDED
This option is required by programs like DOSEMU to run 16-bit legacy
code on X86 processors. It also may be needed by software like
XFree86 to initialize some video cards via BIOS. Disabling this
option saves about 6k.
config TOSHIBA
tristate "Toshiba Laptop support"
This adds a driver to safely access the System Management Mode of
the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
not work on models with a Phoenix BIOS. The System Management Mode
is used to set the BIOS and power saving options on Toshiba portables.
For information on utilities to make use of this driver see the
Toshiba Linux utilities web site at:
Say Y if you intend to run this kernel on a Toshiba portable.
Say N otherwise.
config I8K
tristate "Dell laptop support"
This adds a driver to safely access the System Management Mode
of the CPU on the Dell Inspiron 8000. The System Management Mode
is used to read cpu temperature and cooling fan status and to
control the fans on the I8K portables.
This driver has been tested only on the Inspiron 8000 but it may
also work with other Dell laptops. You can force loading on other
models by passing the parameter `force=1' to the module. Use at
your own risk.
For information on utilities to make use of this driver see the
I8K Linux utilities web site at:
Say Y if you intend to run this kernel on a Dell Inspiron 8000.
Say N otherwise.
bool "Enable X86 board specific fixups for reboot"
depends on X86
default n
This enables chipset and/or board specific fixups to be done
in order to get reboot to work correctly. This is only needed on
some combinations of hardware and BIOS. The symptom, for which
this config is intended, is when reboot ends with a stalled/hung
Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1.
Say Y if you want to enable the fixup. Currently, it's safe to
enable this option even if you don't need it.
Say N otherwise.
tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
If you say Y here and also to "/dev file system support" in the
'File systems' section, you will be able to update the microcode on
Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
Pentium III, Pentium 4, Xeon etc. You will obviously need the
actual microcode binary data itself which is not shipped with the
Linux kernel.
For latest news and information on obtaining all the required
ingredients for this driver, check:
To compile this driver as a module, choose M here: the
module will be called microcode.
config X86_MSR
tristate "/dev/cpu/*/msr - Model-specific register support"
This device gives privileged processes access to the x86
Model-Specific Registers (MSRs). It is a character device with
major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
MSR accesses are directed to a specific CPU on multi-processor
config X86_CPUID
tristate "/dev/cpu/*/cpuid - CPU information support"
This device gives processes access to the x86 CPUID instruction to
be executed on a specific processor. It is a character device
with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
source "drivers/firmware/Kconfig"
prompt "High Memory Support"
bool "off"
depends on !X86_NUMAQ
Linux can use up to 64 Gigabytes of physical memory on x86 systems.
However, the address space of 32-bit x86 processors is only 4
Gigabytes large. That means that, if you have a large amount of
physical memory, not all of it can be "permanently mapped" by the
kernel. The physical memory that's not permanently mapped is called
"high memory".
If you are compiling a kernel which will never run on a machine with
more than 1 Gigabyte total physical RAM, answer "off" here (default
choice and suitable for most users). This will result in a "3GB/1GB"
split: 3GB are mapped so that each process sees a 3GB virtual memory
space and the remaining part of the 4GB virtual memory space is used
by the kernel to permanently map as much physical memory as
If the machine has between 1 and 4 Gigabytes physical RAM, then
answer "4GB" here.
If more than 4 Gigabytes is used then answer "64GB" here. This
selection turns Intel PAE (Physical Address Extension) mode on.
PAE implements 3-level paging on IA32 processors. PAE is fully
supported by Linux, PAE mode is implemented on all recent Intel
processors (Pentium Pro and better). NOTE: If you say "64GB" here,
then the kernel will not boot on CPUs that don't support PAE!
The actual amount of total physical memory will either be
auto detected or can be forced by using a kernel command line option
such as "mem=256M". (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 "off".
config HIGHMEM4G
bool "4GB"
depends on !X86_NUMAQ
Select this if you have a 32-bit processor and between 1 and 4
gigabytes of physical RAM.
config HIGHMEM64G
bool "64GB"
depends on X86_CMPXCHG64
Select this if you have a 32-bit processor and more than 4
gigabytes of physical RAM.
depends on EXPERIMENTAL && !X86_PAE
prompt "Memory split" if EMBEDDED
default VMSPLIT_3G
Select the desired split between kernel and user memory.
If the address range available to the kernel is less than the
physical memory installed, the remaining memory will be available
as "high memory". Accessing high memory is a little more costly
than low memory, as it needs to be mapped into the kernel first.
Note that increasing the kernel address space limits the range
available to user programs, making the address space there
tighter. Selecting anything other than the default 3G/1G split
will also likely make your kernel incompatible with binary-only
kernel modules.
If you are not absolutely sure what you are doing, leave this
option alone!
config VMSPLIT_3G
bool "3G/1G user/kernel split"
bool "3G/1G user/kernel split (for full 1G low memory)"
config VMSPLIT_2G
bool "2G/2G user/kernel split"
config VMSPLIT_1G
bool "1G/3G user/kernel split"
default 0xB0000000 if VMSPLIT_3G_OPT
default 0x78000000 if VMSPLIT_2G
default 0x40000000 if VMSPLIT_1G
default 0xC0000000
config HIGHMEM
depends on HIGHMEM64G || HIGHMEM4G
default y
config X86_PAE
depends on HIGHMEM64G
default y
# Common NUMA Features
config NUMA
bool "Numa Memory Allocation and Scheduler Support"
depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI)
default n if X86_PC
default y if (X86_NUMAQ || X86_SUMMIT)
comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
default "4" if X86_NUMAQ
default "3"
depends on NUMA
default y
default y
default y
depends on NUMA
default y
def_bool y
def_bool y
depends on NUMA
def_bool y
depends on NUMA
def_bool y
depends on (NUMA || (X86_PC && EXPERIMENTAL))
def_bool y
source "mm/Kconfig"
default y
depends on NUMA
config HIGHPTE
bool "Allocate 3rd-level pagetables from highmem"
depends on HIGHMEM4G || HIGHMEM64G
The VM uses one page table entry for each page of physical memory.
For systems with a lot of RAM, this can be wasteful of precious
low memory. Setting this option will put user-space page table
entries in high memory.
bool "Math emulation"
Linux can emulate a math coprocessor (used for floating point
operations) if you don't have one. 486DX and Pentium processors have
a math coprocessor built in, 486SX and 386 do not, unless you added
a 487DX or 387, respectively. (The messages during boot time can
give you some hints here ["man dmesg"].) Everyone needs either a
coprocessor or this emulation.
If you don't have a math coprocessor, you need to say Y here; if you
say Y here even though you have a coprocessor, the coprocessor will
be used nevertheless. (This behavior can be changed with the kernel
command line option "no387", which comes handy if your coprocessor
is broken. 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.) This means that it is a good idea to say Y here if you
intend to use this kernel on different machines.
More information about the internals of the Linux math coprocessor
emulation can be found in <file:arch/i386/math-emu/README>.
If you are not sure, say Y; apart from resulting in a 66 KB bigger
kernel, it won't hurt.
config MTRR
bool "MTRR (Memory Type Range Register) support"
On Intel P6 family processors (Pentium Pro, Pentium II and later)
the Memory Type Range Registers (MTRRs) may be used to control
processor access to memory ranges. This is most useful if you have
a video (VGA) card on a PCI or AGP bus. Enabling write-combining
allows bus write transfers to be combined into a larger transfer
before bursting over the PCI/AGP bus. This can increase performance
of image write operations 2.5 times or more. Saying Y here creates a
/proc/mtrr file which may be used to manipulate your processor's
MTRRs. Typically the X server should use this.
This code has a reasonably generic interface so that similar
control registers on other processors can be easily supported
as well:
The Cyrix 6x86, 6x86MX and M II processors have Address Range
Registers (ARRs) which provide a similar functionality to MTRRs. For
these, the ARRs are used to emulate the MTRRs.
The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
write-combining. All of these processors are supported by this code
and it makes sense to say Y here if you have one of them.
Saying Y here also fixes a problem with buggy SMP BIOSes which only
set the MTRRs for the boot CPU and not for the secondary CPUs. This
can lead to all sorts of problems, so it's good to say Y here.
You can safely say Y even if your machine doesn't have MTRRs, you'll
just add about 9 KB to your kernel.
See <file:Documentation/mtrr.txt> for more information.
config EFI
bool "Boot from EFI support"
depends on ACPI
default n
This enables the the kernel to boot on EFI platforms using
system configuration information passed to it from the firmware.
This also enables the kernel to use any EFI runtime services that are
available (such as the EFI variable services).
This option is only useful on systems that have EFI firmware
and will result in a kernel image that is ~8k larger. In addition,
you must use the latest ELILO loader available at
<> in order to take advantage of
kernel initialization using EFI information (neither GRUB nor LILO know
anything about EFI). However, even with this option, the resultant
kernel should continue to boot on existing non-EFI platforms.
bool "Enable kernel irq balancing"
depends on SMP && X86_IO_APIC
default y
The default yes will allow the kernel to do irq load balancing.
Saying no will keep the kernel from doing irq load balancing.
# turning this on wastes a bunch of space.
# Summit needs it only when NUMA is on
depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
default y
config REGPARM
bool "Use register arguments"
default y
Compile the kernel with -mregparm=3. This instructs gcc to use
a more efficient function call ABI which passes the first three
arguments of a function call via registers, which results in denser
and faster code.
If this option is disabled, then the default ABI of passing
arguments via the stack is used.
If unsure, say Y.
config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
default y
This kernel feature is useful for number crunching applications
that may need to compute untrusted bytecode during their
execution. By using pipes or other transports made available to
the process as file descriptors supporting the read/write
syscalls, it's possible to isolate those applications in
their own address space using seccomp. Once seccomp is
enabled via /proc/<pid>/seccomp, it cannot be disabled
and the task is only allowed to execute a few safe syscalls
defined by each seccomp mode.
If unsure, say Y. Only embedded should say N here.
source kernel/Kconfig.hz
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot
but it is independent of the system firmware. And like a reboot
you can start any kernel with it, not just Linux.
The name comes from the similarity to the exec system call.
It is an ongoing process to be certain the hardware in a machine
is properly shutdown, so do not be surprised if this code does not
initially work for you. It may help to enable device hotplugging
support. As of this writing the exact hardware interface is
strongly in flux, so no good recommendation can be made.
bool "kernel crash dumps (EXPERIMENTAL)"
depends on HIGHMEM
Generate crash dump after being started by kexec.
hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
default "0x1000000" if CRASH_DUMP
default "0x100000"
This gives the physical address where the kernel is loaded. Normally
for regular kernels this value is 0x100000 (1MB). But in the case
of kexec on panic the fail safe kernel needs to run at a different
address than the panic-ed kernel. This option is used to set the load
address for kernels used to capture crash dump on being kexec'ed
after panic. The default value for crash dump kernels is
0x1000000 (16MB). This can also be set based on the "X" value as
specified in the "crashkernel=YM@XM" command line boot parameter
passed to the panic-ed kernel. Typically this parameter is set as
crashkernel=64M@16M. Please take a look at
Documentation/kdump/kdump.txt for more details about crash dumps.
Don't change this unless you know what you are doing.
bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
Say Y here to experiment with turning CPUs off and on, and to
enable suspend on SMP systems. CPUs can be controlled through
bool "Compat VDSO support"
default y
Map the VDSO to the predictable old-style address too.
Say N here if you are running a sufficiently recent glibc
version (2.3.3 or later), to remove the high-mapped
VDSO mapping and to exclusively use the randomized VDSO.
If unsure, say Y.
def_bool y
depends on HIGHMEM
menu "Power management options (ACPI, APM)"
depends on !X86_VOYAGER
source kernel/power/Kconfig
source "drivers/acpi/Kconfig"
menu "APM (Advanced Power Management) BIOS Support"
depends on PM && !X86_VISWS
config APM
tristate "APM (Advanced Power Management) BIOS support"
depends on PM
APM is a BIOS specification for saving power using several different
techniques. This is mostly useful for battery powered laptops with
APM compliant BIOSes. If you say Y here, the system time will be
reset after a RESUME operation, the /proc/apm device will provide
battery status information, and user-space programs will receive
notification of APM "events" (e.g. battery status change).
If you select "Y" here, you can disable actual use of the APM
BIOS by passing the "apm=off" option to the kernel at boot time.
Note that the APM support is almost completely disabled for
machines with more than one CPU.
In order to use APM, you will need supporting software. For location
and more information, read <file:Documentation/pm.txt> and the
Battery Powered Linux mini-HOWTO, available from
This driver does not spin down disk drives (see the hdparm(8)
manpage ("man 8 hdparm") for that), and it doesn't turn off
VESA-compliant "green" monitors.
This driver does not support the TI 4000M TravelMate and the ACER
486/DX4/75 because they don't have compliant BIOSes. Many "green"
desktop machines also don't have compliant BIOSes, and this driver
may cause those machines to panic during the boot phase.
Generally, if you don't have a battery in your machine, there isn't
much point in using this driver and you should say N. If you get
random kernel OOPSes or reboots that don't seem to be related to
anything, try disabling/enabling this option (or disabling/enabling
APM in your BIOS).
Some other things you should try when experiencing seemingly random,
"weird" problems:
1) make sure that you have enough swap space and that it is
2) pass the "no-hlt" option to the kernel
3) switch on floating point emulation in the kernel and pass
the "no387" option to the kernel
4) pass the "floppy=nodma" option to the kernel
5) pass the "mem=4M" option to the kernel (thereby disabling
all but the first 4 MB of RAM)
6) make sure that the CPU is not over clocked.
7) read the sig11 FAQ at <>
8) disable the cache from your BIOS settings
9) install a fan for the video card or exchange video RAM
10) install a better fan for the CPU
11) exchange RAM chips
12) exchange the motherboard.
To compile this driver as a module, choose M here: the
module will be called apm.
bool "Ignore USER SUSPEND"
depends on APM
This option will ignore USER SUSPEND requests. On machines with a
compliant APM BIOS, you want to say N. However, on the NEC Versa M
series notebooks, it is necessary to say Y because of a BIOS bug.
bool "Enable PM at boot time"
depends on APM
Enable APM features at boot time. From page 36 of the APM BIOS
specification: "When disabled, the APM BIOS does not automatically
power manage devices, enter the Standby State, enter the Suspend
State, or take power saving steps in response to CPU Idle calls."
This driver will make CPU Idle calls when Linux is idle (unless this
feature is turned off -- see "Do CPU IDLE calls", below). This
should always save battery power, but more complicated APM features
will be dependent on your BIOS implementation. You may need to turn
this option off if your computer hangs at boot time when using APM
support, or if it beeps continuously instead of suspending. Turn
this off if you have a NEC UltraLite Versa 33/C or a Toshiba
T400CDT. This is off by default since most machines do fine without
this feature.
bool "Make CPU Idle calls when idle"
depends on APM
Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
On some machines, this can activate improved power savings, such as
a slowed CPU clock rate, when the machine is idle. These idle calls
are made after the idle loop has run for some length of time (e.g.,
333 mS). On some machines, this will cause a hang at boot time or
whenever the CPU becomes idle. (On machines with more than one CPU,
this option does nothing.)
bool "Enable console blanking using APM"
depends on APM
Enable console blanking using the APM. Some laptops can use this to
turn off the LCD backlight when the screen blanker of the Linux
virtual console blanks the screen. Note that this is only used by
the virtual console screen blanker, and won't turn off the backlight
when using the X Window system. This also doesn't have anything to
do with your VESA-compliant power-saving monitor. Further, this
option doesn't work for all laptops -- it might not turn off your
backlight at all, or it might print a lot of errors to the console,
especially if you are using gpm.
bool "RTC stores time in GMT"
depends on APM
Say Y here if your RTC (Real Time Clock a.k.a. hardware clock)
stores the time in GMT (Greenwich Mean Time). Say N if your RTC
stores localtime.
It is in fact recommended to store GMT in your RTC, because then you
don't have to worry about daylight savings time changes. The only
reason not to use GMT in your RTC is if you also run a broken OS
that doesn't understand GMT.
bool "Allow interrupts during APM BIOS calls"
depends on APM
Normally we disable external interrupts while we are making calls to
the APM BIOS as a measure to lessen the effects of a badly behaving
BIOS implementation. The BIOS should reenable interrupts if it
needs to. Unfortunately, some BIOSes do not -- especially those in
many of the newer IBM Thinkpads. If you experience hangs when you
suspend, try setting this to Y. Otherwise, say N.
bool "Use real mode APM BIOS call to power off"
depends on APM
Use real mode APM BIOS calls to switch off the computer. This is
a work-around for a number of buggy BIOSes. Switch this option on if
your computer crashes instead of powering off properly.
source "arch/i386/kernel/cpu/cpufreq/Kconfig"
menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
config PCI
bool "PCI support" if !X86_VISWS
depends on !X86_VOYAGER
default y if X86_VISWS
Find out whether you have a PCI motherboard. PCI is the name of a
bus system, i.e. the way the CPU talks to the other stuff inside
your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
VESA. If you have PCI, say Y, otherwise N.
The PCI-HOWTO, available from
<>, contains valuable
information about which PCI hardware does work under Linux and which
prompt "PCI access mode"
depends on PCI && !X86_VISWS
default PCI_GOANY
On PCI systems, the BIOS can be used to detect the PCI devices and
determine their configuration. However, some old PCI motherboards
have BIOS bugs and may crash if this is done. Also, some embedded
PCI-based systems don't have any BIOS at all. Linux can also try to
detect the PCI hardware directly without using the BIOS.
With this option, you can specify how Linux should detect the
PCI devices. If you choose "BIOS", the BIOS will be used,
if you choose "Direct", the BIOS won't be used, and if you
choose "MMConfig", then PCI Express MMCONFIG will be used.
If you choose "Any", the kernel will try MMCONFIG, then the
direct access method and falls back to the BIOS if that doesn't
work. If unsure, go with the default, which is "Any".
bool "BIOS"
bool "MMConfig"
bool "Direct"
config PCI_GOANY
bool "Any"
config PCI_BIOS
depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
default y
depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
default y
default y
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
config ISA_DMA_API
default y
config ISA
bool "ISA support"
depends on !(X86_VOYAGER || X86_VISWS)
Find out whether you have ISA slots on your motherboard. ISA is the
name of a bus system, i.e. the way the CPU talks to the other stuff
inside your box. Other bus systems are PCI, EISA, MicroChannel
(MCA) or VESA. ISA is an older system, now being displaced by PCI;
newer boards don't support it. If you have ISA, say Y, otherwise N.
config EISA
bool "EISA support"
depends on ISA
The Extended Industry Standard Architecture (EISA) bus was
developed as an open alternative to the IBM MicroChannel bus.
The EISA bus provided some of the features of the IBM MicroChannel
bus while maintaining backward compatibility with cards made for
the older ISA bus. The EISA bus saw limited use between 1988 and
1995 when it was made obsolete by the PCI bus.
Say Y here if you are building a kernel for an EISA-based machine.
Otherwise, say N.
source "drivers/eisa/Kconfig"
config MCA
bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
default y if X86_VOYAGER
MicroChannel Architecture is found in some IBM PS/2 machines and
laptops. It is a bus system similar to PCI or ISA. See
<file:Documentation/mca.txt> (and especially the web page given
there) before attempting to build an MCA bus kernel.
source "drivers/mca/Kconfig"
config SCx200
tristate "NatSemi SCx200 support"
depends on !X86_VOYAGER
This provides basic support for National Semiconductor's
(now AMD's) Geode processors. The driver probes for the
PCI-IDs of several on-chip devices, so its a good dependency
for other scx200_* drivers.
If compiled as a module, the driver is named scx200.
config SCx200HR_TIMER
tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
depends on SCx200 && GENERIC_TIME
default y
This driver provides a clocksource built upon the on-chip
27MHz high-resolution timer. Its also a workaround for
NSC Geode SC-1100's buggy TSC, which loses time when the
processor goes idle (as is done by the scheduler). The
other workaround is idle=poll boot option.
config K8_NB
def_bool y
depends on AGP_AMD64
source "drivers/pcmcia/Kconfig"
source "drivers/pci/hotplug/Kconfig"
menu "Executable file formats"
source "fs/Kconfig.binfmt"
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
menu "Instrumentation Support"
source "arch/i386/oprofile/Kconfig"
config KPROBES
bool "Kprobes (EXPERIMENTAL)"
Kprobes allows you to trap at almost any kernel address and
execute a callback function. register_kprobe() establishes
a probepoint and specifies the callback. Kprobes is useful
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
source "arch/i386/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
# Use the generic interrupt handling code in kernel/irq/:
default y
default y
default y
config X86_SMP
depends on SMP && !X86_VOYAGER
default y
config X86_HT
depends on SMP && !(X86_VISWS || X86_VOYAGER)
default y
config X86_BIOS_REBOOT
depends on !(X86_VISWS || X86_VOYAGER)
default y
depends on X86_SMP || (X86_VOYAGER && SMP)
default y
default y