2 mainmenu "Linux Kernel Configuration for x86"
6 bool "64-bit kernel" if ARCH = "x86"
7 default ARCH = "x86_64"
9 Say yes to build a 64-bit kernel - formerly known as x86_64
10 Say no to build a 32-bit kernel - formerly known as i386
24 select HAVE_KRETPROBES
25 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
29 config GENERIC_LOCKBREAK
35 config GENERIC_CMOS_UPDATE
38 config CLOCKSOURCE_WATCHDOG
41 config GENERIC_CLOCKEVENTS
44 config GENERIC_CLOCKEVENTS_BROADCAST
46 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
48 config LOCKDEP_SUPPORT
51 config STACKTRACE_SUPPORT
54 config HAVE_LATENCYTOP_SUPPORT
57 config FAST_CMPXCHG_LOCAL
70 config GENERIC_ISA_DMA
80 config GENERIC_HWEIGHT
86 config ARCH_MAY_HAVE_PC_FDC
92 config RWSEM_GENERIC_SPINLOCK
95 config RWSEM_XCHGADD_ALGORITHM
98 config ARCH_HAS_ILOG2_U32
101 config ARCH_HAS_ILOG2_U64
104 config ARCH_HAS_CPU_IDLE_WAIT
107 config GENERIC_CALIBRATE_DELAY
110 config GENERIC_TIME_VSYSCALL
114 config ARCH_HAS_CPU_RELAX
117 config HAVE_SETUP_PER_CPU_AREA
118 def_bool X86_64 || (X86_SMP && !X86_VOYAGER)
120 config ARCH_HIBERNATION_POSSIBLE
122 depends on !SMP || !X86_VOYAGER
124 config ARCH_SUSPEND_POSSIBLE
126 depends on !X86_VOYAGER
132 config ARCH_POPULATES_NODE_MAP
139 config ARCH_SUPPORTS_AOUT
142 # Use the generic interrupt handling code in kernel/irq/:
143 config GENERIC_HARDIRQS
147 config GENERIC_IRQ_PROBE
151 config GENERIC_PENDING_IRQ
153 depends on GENERIC_HARDIRQS && SMP
158 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
163 depends on X86_32 && SMP
167 depends on X86_64 && SMP
172 depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || X86_64
175 config X86_BIOS_REBOOT
177 depends on X86_32 && !(X86_VISWS || X86_VOYAGER)
180 config X86_TRAMPOLINE
182 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
187 source "init/Kconfig"
189 menu "Processor type and features"
191 source "kernel/time/Kconfig"
194 bool "Symmetric multi-processing support"
196 This enables support for systems with more than one CPU. If you have
197 a system with only one CPU, like most personal computers, say N. If
198 you have a system with more than one CPU, say Y.
200 If you say N here, the kernel will run on single and multiprocessor
201 machines, but will use only one CPU of a multiprocessor machine. If
202 you say Y here, the kernel will run on many, but not all,
203 singleprocessor machines. On a singleprocessor machine, the kernel
204 will run faster if you say N here.
206 Note that if you say Y here and choose architecture "586" or
207 "Pentium" under "Processor family", the kernel will not work on 486
208 architectures. Similarly, multiprocessor kernels for the "PPro"
209 architecture may not work on all Pentium based boards.
211 People using multiprocessor machines who say Y here should also say
212 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
213 Management" code will be disabled if you say Y here.
215 See also <file:Documentation/i386/IO-APIC.txt>,
216 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
217 <http://www.tldp.org/docs.html#howto>.
219 If you don't know what to do here, say N.
222 prompt "Subarchitecture Type"
228 Choose this option if your computer is a standard PC or compatible.
234 Select this for an AMD Elan processor.
236 Do not use this option for K6/Athlon/Opteron processors!
238 If unsure, choose "PC-compatible" instead.
242 depends on X86_32 && (SMP || BROKEN)
244 Voyager is an MCA-based 32-way capable SMP architecture proprietary
245 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
249 If you do not specifically know you have a Voyager based machine,
250 say N here, otherwise the kernel you build will not be bootable.
253 bool "NUMAQ (IBM/Sequent)"
254 depends on SMP && X86_32
257 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
258 multiquad box. This changes the way that processors are bootstrapped,
259 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
260 You will need a new lynxer.elf file to flash your firmware with - send
261 email to <Martin.Bligh@us.ibm.com>.
264 bool "Summit/EXA (IBM x440)"
265 depends on X86_32 && SMP
267 This option is needed for IBM systems that use the Summit/EXA chipset.
268 In particular, it is needed for the x440.
270 If you don't have one of these computers, you should say N here.
271 If you want to build a NUMA kernel, you must select ACPI.
274 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
275 depends on X86_32 && SMP
277 This option is needed for the systems that have more than 8 CPUs
278 and if the system is not of any sub-arch type above.
280 If you don't have such a system, you should say N here.
283 bool "SGI 320/540 (Visual Workstation)"
286 The SGI Visual Workstation series is an IA32-based workstation
287 based on SGI systems chips with some legacy PC hardware attached.
289 Say Y here to create a kernel to run on the SGI 320 or 540.
291 A kernel compiled for the Visual Workstation will not run on PCs
292 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
294 config X86_GENERICARCH
295 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
298 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
299 It is intended for a generic binary kernel.
300 If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
303 bool "Support for Unisys ES7000 IA32 series"
304 depends on X86_32 && SMP
306 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
307 supposed to run on an IA32-based Unisys ES7000 system.
308 Only choose this option if you have such a system, otherwise you
312 bool "RDC R-321x SoC"
315 select X86_REBOOTFIXUPS
320 This option is needed for RDC R-321x system-on-chip, also known
322 If you don't have one of these chips, you should say N here.
325 bool "Support for ScaleMP vSMP"
329 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
330 supposed to run on these EM64T-based machines. Only choose this option
331 if you have one of these machines.
335 config SCHED_NO_NO_OMIT_FRAME_POINTER
337 prompt "Single-depth WCHAN output"
340 Calculate simpler /proc/<PID>/wchan values. If this option
341 is disabled then wchan values will recurse back to the
342 caller function. This provides more accurate wchan values,
343 at the expense of slightly more scheduling overhead.
345 If in doubt, say "Y".
347 menuconfig PARAVIRT_GUEST
348 bool "Paravirtualized guest support"
350 Say Y here to get to see options related to running Linux under
351 various hypervisors. This option alone does not add any kernel code.
353 If you say N, all options in this submenu will be skipped and disabled.
357 source "arch/x86/xen/Kconfig"
360 bool "VMI Guest support"
363 depends on !(X86_VISWS || X86_VOYAGER)
365 VMI provides a paravirtualized interface to the VMware ESX server
366 (it could be used by other hypervisors in theory too, but is not
367 at the moment), by linking the kernel to a GPL-ed ROM module
368 provided by the hypervisor.
370 source "arch/x86/lguest/Kconfig"
373 bool "Enable paravirtualization code"
374 depends on !(X86_VISWS || X86_VOYAGER)
376 This changes the kernel so it can modify itself when it is run
377 under a hypervisor, potentially improving performance significantly
378 over full virtualization. However, when run without a hypervisor
379 the kernel is theoretically slower and slightly larger.
383 config MEMTEST_BOOTPARAM
384 bool "Memtest boot parameter"
388 This option adds a kernel parameter 'memtest', which allows memtest
389 to be disabled at boot. If this option is selected, memtest
390 functionality can be disabled with memtest=0 on the kernel
391 command line. The purpose of this option is to allow a single
392 kernel image to be distributed with memtest built in, but not
395 If you are unsure how to answer this question, answer Y.
397 config MEMTEST_BOOTPARAM_VALUE
398 int "Memtest boot parameter default value (0-4)"
399 depends on MEMTEST_BOOTPARAM
403 This option sets the default value for the kernel parameter
404 'memtest', which allows memtest to be disabled at boot. If this
405 option is set to 0 (zero), the memtest kernel parameter will
406 default to 0, disabling memtest at bootup. If this option is
407 set to 4, the memtest kernel parameter will default to 4,
408 enabling memtest at bootup, and use that as pattern number.
410 If you are unsure how to answer this question, answer 0.
414 depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
417 config HAVE_ARCH_PARSE_SRAT
421 config X86_SUMMIT_NUMA
423 depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)
425 config X86_CYCLONE_TIMER
427 depends on X86_32 && X86_SUMMIT || X86_GENERICARCH
429 config ES7000_CLUSTERED_APIC
431 depends on SMP && X86_ES7000 && MPENTIUMIII
433 source "arch/x86/Kconfig.cpu"
437 prompt "HPET Timer Support" if X86_32
439 Use the IA-PC HPET (High Precision Event Timer) to manage
440 time in preference to the PIT and RTC, if a HPET is
442 HPET is the next generation timer replacing legacy 8254s.
443 The HPET provides a stable time base on SMP
444 systems, unlike the TSC, but it is more expensive to access,
445 as it is off-chip. You can find the HPET spec at
446 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
448 You can safely choose Y here. However, HPET will only be
449 activated if the platform and the BIOS support this feature.
450 Otherwise the 8254 will be used for timing services.
452 Choose N to continue using the legacy 8254 timer.
454 config HPET_EMULATE_RTC
456 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
458 # Mark as embedded because too many people got it wrong.
459 # The code disables itself when not needed.
461 bool "GART IOMMU support" if EMBEDDED
465 depends on X86_64 && PCI
467 Support for full DMA access of devices with 32bit memory access only
468 on systems with more than 3GB. This is usually needed for USB,
469 sound, many IDE/SATA chipsets and some other devices.
470 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
471 based hardware IOMMU and a software bounce buffer based IOMMU used
472 on Intel systems and as fallback.
473 The code is only active when needed (enough memory and limited
474 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
478 bool "IBM Calgary IOMMU support"
480 depends on X86_64 && PCI && EXPERIMENTAL
482 Support for hardware IOMMUs in IBM's xSeries x366 and x460
483 systems. Needed to run systems with more than 3GB of memory
484 properly with 32-bit PCI devices that do not support DAC
485 (Double Address Cycle). Calgary also supports bus level
486 isolation, where all DMAs pass through the IOMMU. This
487 prevents them from going anywhere except their intended
488 destination. This catches hard-to-find kernel bugs and
489 mis-behaving drivers and devices that do not use the DMA-API
490 properly to set up their DMA buffers. The IOMMU can be
491 turned off at boot time with the iommu=off parameter.
492 Normally the kernel will make the right choice by itself.
495 config CALGARY_IOMMU_ENABLED_BY_DEFAULT
497 prompt "Should Calgary be enabled by default?"
498 depends on CALGARY_IOMMU
500 Should Calgary be enabled by default? if you choose 'y', Calgary
501 will be used (if it exists). If you choose 'n', Calgary will not be
502 used even if it exists. If you choose 'n' and would like to use
503 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
507 def_bool (CALGARY_IOMMU || GART_IOMMU)
509 # need this always selected by IOMMU for the VIA workaround
513 Support for software bounce buffers used on x86-64 systems
514 which don't have a hardware IOMMU (e.g. the current generation
515 of Intel's x86-64 CPUs). Using this PCI devices which can only
516 access 32-bits of memory can be used on systems with more than
517 3 GB of memory. If unsure, say Y.
521 int "Maximum number of CPUs (2-255)"
524 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
527 This allows you to specify the maximum number of CPUs which this
528 kernel will support. The maximum supported value is 255 and the
529 minimum value which makes sense is 2.
531 This is purely to save memory - each supported CPU adds
532 approximately eight kilobytes to the kernel image.
535 bool "SMT (Hyperthreading) scheduler support"
538 SMT scheduler support improves the CPU scheduler's decision making
539 when dealing with Intel Pentium 4 chips with HyperThreading at a
540 cost of slightly increased overhead in some places. If unsure say
545 prompt "Multi-core scheduler support"
548 Multi-core scheduler support improves the CPU scheduler's decision
549 making when dealing with multi-core CPU chips at a cost of slightly
550 increased overhead in some places. If unsure say N here.
552 source "kernel/Kconfig.preempt"
555 bool "Local APIC support on uniprocessors"
556 depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
558 A local APIC (Advanced Programmable Interrupt Controller) is an
559 integrated interrupt controller in the CPU. If you have a single-CPU
560 system which has a processor with a local APIC, you can say Y here to
561 enable and use it. If you say Y here even though your machine doesn't
562 have a local APIC, then the kernel will still run with no slowdown at
563 all. The local APIC supports CPU-generated self-interrupts (timer,
564 performance counters), and the NMI watchdog which detects hard
568 bool "IO-APIC support on uniprocessors"
569 depends on X86_UP_APIC
571 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
572 SMP-capable replacement for PC-style interrupt controllers. Most
573 SMP systems and many recent uniprocessor systems have one.
575 If you have a single-CPU system with an IO-APIC, you can say Y here
576 to use it. If you say Y here even though your machine doesn't have
577 an IO-APIC, then the kernel will still run with no slowdown at all.
579 config X86_LOCAL_APIC
581 depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))
585 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))
587 config X86_VISWS_APIC
589 depends on X86_32 && X86_VISWS
592 bool "Machine Check Exception"
593 depends on !X86_VOYAGER
595 Machine Check Exception support allows the processor to notify the
596 kernel if it detects a problem (e.g. overheating, component failure).
597 The action the kernel takes depends on the severity of the problem,
598 ranging from a warning message on the console, to halting the machine.
599 Your processor must be a Pentium or newer to support this - check the
600 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
601 have a design flaw which leads to false MCE events - hence MCE is
602 disabled on all P5 processors, unless explicitly enabled with "mce"
603 as a boot argument. Similarly, if MCE is built in and creates a
604 problem on some new non-standard machine, you can boot with "nomce"
605 to disable it. MCE support simply ignores non-MCE processors like
606 the 386 and 486, so nearly everyone can say Y here.
610 prompt "Intel MCE features"
611 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
613 Additional support for intel specific MCE features such as
618 prompt "AMD MCE features"
619 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
621 Additional support for AMD specific MCE features such as
622 the DRAM Error Threshold.
624 config X86_MCE_NONFATAL
625 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
626 depends on X86_32 && X86_MCE
628 Enabling this feature starts a timer that triggers every 5 seconds which
629 will look at the machine check registers to see if anything happened.
630 Non-fatal problems automatically get corrected (but still logged).
631 Disable this if you don't want to see these messages.
632 Seeing the messages this option prints out may be indicative of dying
633 or out-of-spec (ie, overclocked) hardware.
634 This option only does something on certain CPUs.
635 (AMD Athlon/Duron and Intel Pentium 4)
637 config X86_MCE_P4THERMAL
638 bool "check for P4 thermal throttling interrupt."
639 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
641 Enabling this feature will cause a message to be printed when the P4
642 enters thermal throttling.
645 bool "Enable VM86 support" if EMBEDDED
649 This option is required by programs like DOSEMU to run 16-bit legacy
650 code on X86 processors. It also may be needed by software like
651 XFree86 to initialize some video cards via BIOS. Disabling this
652 option saves about 6k.
655 tristate "Toshiba Laptop support"
658 This adds a driver to safely access the System Management Mode of
659 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
660 not work on models with a Phoenix BIOS. The System Management Mode
661 is used to set the BIOS and power saving options on Toshiba portables.
663 For information on utilities to make use of this driver see the
664 Toshiba Linux utilities web site at:
665 <http://www.buzzard.org.uk/toshiba/>.
667 Say Y if you intend to run this kernel on a Toshiba portable.
671 tristate "Dell laptop support"
673 This adds a driver to safely access the System Management Mode
674 of the CPU on the Dell Inspiron 8000. The System Management Mode
675 is used to read cpu temperature and cooling fan status and to
676 control the fans on the I8K portables.
678 This driver has been tested only on the Inspiron 8000 but it may
679 also work with other Dell laptops. You can force loading on other
680 models by passing the parameter `force=1' to the module. Use at
683 For information on utilities to make use of this driver see the
684 I8K Linux utilities web site at:
685 <http://people.debian.org/~dz/i8k/>
687 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
690 config X86_REBOOTFIXUPS
692 prompt "Enable X86 board specific fixups for reboot"
693 depends on X86_32 && X86
695 This enables chipset and/or board specific fixups to be done
696 in order to get reboot to work correctly. This is only needed on
697 some combinations of hardware and BIOS. The symptom, for which
698 this config is intended, is when reboot ends with a stalled/hung
701 Currently, the only fixup is for the Geode machines using
702 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
704 Say Y if you want to enable the fixup. Currently, it's safe to
705 enable this option even if you don't need it.
709 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
712 If you say Y here, you will be able to update the microcode on
713 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
714 Pentium III, Pentium 4, Xeon etc. You will obviously need the
715 actual microcode binary data itself which is not shipped with the
718 For latest news and information on obtaining all the required
719 ingredients for this driver, check:
720 <http://www.urbanmyth.org/microcode/>.
722 To compile this driver as a module, choose M here: the
723 module will be called microcode.
725 config MICROCODE_OLD_INTERFACE
730 tristate "/dev/cpu/*/msr - Model-specific register support"
732 This device gives privileged processes access to the x86
733 Model-Specific Registers (MSRs). It is a character device with
734 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
735 MSR accesses are directed to a specific CPU on multi-processor
739 tristate "/dev/cpu/*/cpuid - CPU information support"
741 This device gives processes access to the x86 CPUID instruction to
742 be executed on a specific processor. It is a character device
743 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
747 prompt "High Memory Support"
748 default HIGHMEM4G if !X86_NUMAQ
749 default HIGHMEM64G if X86_NUMAQ
754 depends on !X86_NUMAQ
756 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
757 However, the address space of 32-bit x86 processors is only 4
758 Gigabytes large. That means that, if you have a large amount of
759 physical memory, not all of it can be "permanently mapped" by the
760 kernel. The physical memory that's not permanently mapped is called
763 If you are compiling a kernel which will never run on a machine with
764 more than 1 Gigabyte total physical RAM, answer "off" here (default
765 choice and suitable for most users). This will result in a "3GB/1GB"
766 split: 3GB are mapped so that each process sees a 3GB virtual memory
767 space and the remaining part of the 4GB virtual memory space is used
768 by the kernel to permanently map as much physical memory as
771 If the machine has between 1 and 4 Gigabytes physical RAM, then
774 If more than 4 Gigabytes is used then answer "64GB" here. This
775 selection turns Intel PAE (Physical Address Extension) mode on.
776 PAE implements 3-level paging on IA32 processors. PAE is fully
777 supported by Linux, PAE mode is implemented on all recent Intel
778 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
779 then the kernel will not boot on CPUs that don't support PAE!
781 The actual amount of total physical memory will either be
782 auto detected or can be forced by using a kernel command line option
783 such as "mem=256M". (Try "man bootparam" or see the documentation of
784 your boot loader (lilo or loadlin) about how to pass options to the
785 kernel at boot time.)
787 If unsure, say "off".
791 depends on !X86_NUMAQ
793 Select this if you have a 32-bit processor and between 1 and 4
794 gigabytes of physical RAM.
798 depends on !M386 && !M486
801 Select this if you have a 32-bit processor and more than 4
802 gigabytes of physical RAM.
807 depends on EXPERIMENTAL
808 prompt "Memory split" if EMBEDDED
812 Select the desired split between kernel and user memory.
814 If the address range available to the kernel is less than the
815 physical memory installed, the remaining memory will be available
816 as "high memory". Accessing high memory is a little more costly
817 than low memory, as it needs to be mapped into the kernel first.
818 Note that increasing the kernel address space limits the range
819 available to user programs, making the address space there
820 tighter. Selecting anything other than the default 3G/1G split
821 will also likely make your kernel incompatible with binary-only
824 If you are not absolutely sure what you are doing, leave this
828 bool "3G/1G user/kernel split"
829 config VMSPLIT_3G_OPT
831 bool "3G/1G user/kernel split (for full 1G low memory)"
833 bool "2G/2G user/kernel split"
834 config VMSPLIT_2G_OPT
836 bool "2G/2G user/kernel split (for full 2G low memory)"
838 bool "1G/3G user/kernel split"
843 default 0xB0000000 if VMSPLIT_3G_OPT
844 default 0x80000000 if VMSPLIT_2G
845 default 0x78000000 if VMSPLIT_2G_OPT
846 default 0x40000000 if VMSPLIT_1G
852 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
856 prompt "PAE (Physical Address Extension) Support"
857 depends on X86_32 && !HIGHMEM4G
858 select RESOURCES_64BIT
860 PAE is required for NX support, and furthermore enables
861 larger swapspace support for non-overcommit purposes. It
862 has the cost of more pagetable lookup overhead, and also
863 consumes more pagetable space per process.
865 # Common NUMA Features
867 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
869 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
871 default y if (X86_NUMAQ || X86_SUMMIT)
873 Enable NUMA (Non Uniform Memory Access) support.
874 The kernel will try to allocate memory used by a CPU on the
875 local memory controller of the CPU and add some more
876 NUMA awareness to the kernel.
878 For i386 this is currently highly experimental and should be only
879 used for kernel development. It might also cause boot failures.
880 For x86_64 this is recommended on all multiprocessor Opteron systems.
881 If the system is EM64T, you should say N unless your system is
884 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
885 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
889 prompt "Old style AMD Opteron NUMA detection"
890 depends on X86_64 && NUMA && PCI
892 Enable K8 NUMA node topology detection. You should say Y here if
893 you have a multi processor AMD K8 system. This uses an old
894 method to read the NUMA configuration directly from the builtin
895 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
896 instead, which also takes priority if both are compiled in.
898 config X86_64_ACPI_NUMA
900 prompt "ACPI NUMA detection"
901 depends on X86_64 && NUMA && ACPI && PCI
904 Enable ACPI SRAT based node topology detection.
906 # Some NUMA nodes have memory ranges that span
907 # other nodes. Even though a pfn is valid and
908 # between a node's start and end pfns, it may not
909 # reside on that node. See memmap_init_zone()
911 config NODES_SPAN_OTHER_NODES
913 depends on X86_64_ACPI_NUMA
916 bool "NUMA emulation"
917 depends on X86_64 && NUMA
919 Enable NUMA emulation. A flat machine will be split
920 into virtual nodes when booted with "numa=fake=N", where N is the
921 number of nodes. This is only useful for debugging.
924 int "Max num nodes shift(1-15)"
926 default "6" if X86_64
927 default "4" if X86_NUMAQ
929 depends on NEED_MULTIPLE_NODES
931 config HAVE_ARCH_BOOTMEM_NODE
933 depends on X86_32 && NUMA
935 config ARCH_HAVE_MEMORY_PRESENT
937 depends on X86_32 && DISCONTIGMEM
939 config NEED_NODE_MEMMAP_SIZE
941 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
943 config HAVE_ARCH_ALLOC_REMAP
945 depends on X86_32 && NUMA
947 config ARCH_FLATMEM_ENABLE
949 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
951 config ARCH_DISCONTIGMEM_ENABLE
953 depends on NUMA && X86_32
955 config ARCH_DISCONTIGMEM_DEFAULT
957 depends on NUMA && X86_32
959 config ARCH_SPARSEMEM_DEFAULT
963 config ARCH_SPARSEMEM_ENABLE
965 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
966 select SPARSEMEM_STATIC if X86_32
967 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
969 config ARCH_SELECT_MEMORY_MODEL
971 depends on ARCH_SPARSEMEM_ENABLE
973 config ARCH_MEMORY_PROBE
975 depends on MEMORY_HOTPLUG
980 bool "Allocate 3rd-level pagetables from highmem"
981 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
983 The VM uses one page table entry for each page of physical memory.
984 For systems with a lot of RAM, this can be wasteful of precious
985 low memory. Setting this option will put user-space page table
986 entries in high memory.
988 config MATH_EMULATION
990 prompt "Math emulation" if X86_32
992 Linux can emulate a math coprocessor (used for floating point
993 operations) if you don't have one. 486DX and Pentium processors have
994 a math coprocessor built in, 486SX and 386 do not, unless you added
995 a 487DX or 387, respectively. (The messages during boot time can
996 give you some hints here ["man dmesg"].) Everyone needs either a
997 coprocessor or this emulation.
999 If you don't have a math coprocessor, you need to say Y here; if you
1000 say Y here even though you have a coprocessor, the coprocessor will
1001 be used nevertheless. (This behavior can be changed with the kernel
1002 command line option "no387", which comes handy if your coprocessor
1003 is broken. Try "man bootparam" or see the documentation of your boot
1004 loader (lilo or loadlin) about how to pass options to the kernel at
1005 boot time.) This means that it is a good idea to say Y here if you
1006 intend to use this kernel on different machines.
1008 More information about the internals of the Linux math coprocessor
1009 emulation can be found in <file:arch/x86/math-emu/README>.
1011 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1012 kernel, it won't hurt.
1015 bool "MTRR (Memory Type Range Register) support"
1017 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1018 the Memory Type Range Registers (MTRRs) may be used to control
1019 processor access to memory ranges. This is most useful if you have
1020 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1021 allows bus write transfers to be combined into a larger transfer
1022 before bursting over the PCI/AGP bus. This can increase performance
1023 of image write operations 2.5 times or more. Saying Y here creates a
1024 /proc/mtrr file which may be used to manipulate your processor's
1025 MTRRs. Typically the X server should use this.
1027 This code has a reasonably generic interface so that similar
1028 control registers on other processors can be easily supported
1031 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1032 Registers (ARRs) which provide a similar functionality to MTRRs. For
1033 these, the ARRs are used to emulate the MTRRs.
1034 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1035 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1036 write-combining. All of these processors are supported by this code
1037 and it makes sense to say Y here if you have one of them.
1039 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1040 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1041 can lead to all sorts of problems, so it's good to say Y here.
1043 You can safely say Y even if your machine doesn't have MTRRs, you'll
1044 just add about 9 KB to your kernel.
1046 See <file:Documentation/mtrr.txt> for more information.
1050 prompt "x86 PAT support"
1051 depends on MTRR && NONPROMISC_DEVMEM
1053 Use PAT attributes to setup page level cache control.
1055 PATs are the modern equivalents of MTRRs and are much more
1056 flexible than MTRRs.
1058 Say N here if you see bootup problems (boot crash, boot hang,
1059 spontaneous reboots) or a non-working video driver.
1065 prompt "EFI runtime service support"
1068 This enables the kernel to use EFI runtime services that are
1069 available (such as the EFI variable services).
1071 This option is only useful on systems that have EFI firmware.
1072 In addition, you should use the latest ELILO loader available
1073 at <http://elilo.sourceforge.net> in order to take advantage
1074 of EFI runtime services. However, even with this option, the
1075 resultant kernel should continue to boot on existing non-EFI
1080 prompt "Enable kernel irq balancing"
1081 depends on X86_32 && SMP && X86_IO_APIC
1083 The default yes will allow the kernel to do irq load balancing.
1084 Saying no will keep the kernel from doing irq load balancing.
1088 prompt "Enable seccomp to safely compute untrusted bytecode"
1091 This kernel feature is useful for number crunching applications
1092 that may need to compute untrusted bytecode during their
1093 execution. By using pipes or other transports made available to
1094 the process as file descriptors supporting the read/write
1095 syscalls, it's possible to isolate those applications in
1096 their own address space using seccomp. Once seccomp is
1097 enabled via /proc/<pid>/seccomp, it cannot be disabled
1098 and the task is only allowed to execute a few safe syscalls
1099 defined by each seccomp mode.
1101 If unsure, say Y. Only embedded should say N here.
1103 config CC_STACKPROTECTOR
1104 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1105 depends on X86_64 && EXPERIMENTAL && BROKEN
1107 This option turns on the -fstack-protector GCC feature. This
1108 feature puts, at the beginning of critical functions, a canary
1109 value on the stack just before the return address, and validates
1110 the value just before actually returning. Stack based buffer
1111 overflows (that need to overwrite this return address) now also
1112 overwrite the canary, which gets detected and the attack is then
1113 neutralized via a kernel panic.
1115 This feature requires gcc version 4.2 or above, or a distribution
1116 gcc with the feature backported. Older versions are automatically
1117 detected and for those versions, this configuration option is ignored.
1119 config CC_STACKPROTECTOR_ALL
1120 bool "Use stack-protector for all functions"
1121 depends on CC_STACKPROTECTOR
1123 Normally, GCC only inserts the canary value protection for
1124 functions that use large-ish on-stack buffers. By enabling
1125 this option, GCC will be asked to do this for ALL functions.
1127 source kernel/Kconfig.hz
1130 bool "kexec system call"
1131 depends on X86_64 || X86_BIOS_REBOOT
1133 kexec is a system call that implements the ability to shutdown your
1134 current kernel, and to start another kernel. It is like a reboot
1135 but it is independent of the system firmware. And like a reboot
1136 you can start any kernel with it, not just Linux.
1138 The name comes from the similarity to the exec system call.
1140 It is an ongoing process to be certain the hardware in a machine
1141 is properly shutdown, so do not be surprised if this code does not
1142 initially work for you. It may help to enable device hotplugging
1143 support. As of this writing the exact hardware interface is
1144 strongly in flux, so no good recommendation can be made.
1147 bool "kernel crash dumps (EXPERIMENTAL)"
1148 depends on EXPERIMENTAL
1149 depends on X86_64 || (X86_32 && HIGHMEM)
1151 Generate crash dump after being started by kexec.
1152 This should be normally only set in special crash dump kernels
1153 which are loaded in the main kernel with kexec-tools into
1154 a specially reserved region and then later executed after
1155 a crash by kdump/kexec. The crash dump kernel must be compiled
1156 to a memory address not used by the main kernel or BIOS using
1157 PHYSICAL_START, or it must be built as a relocatable image
1158 (CONFIG_RELOCATABLE=y).
1159 For more details see Documentation/kdump/kdump.txt
1161 config PHYSICAL_START
1162 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1163 default "0x1000000" if X86_NUMAQ
1164 default "0x200000" if X86_64
1167 This gives the physical address where the kernel is loaded.
1169 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1170 bzImage will decompress itself to above physical address and
1171 run from there. Otherwise, bzImage will run from the address where
1172 it has been loaded by the boot loader and will ignore above physical
1175 In normal kdump cases one does not have to set/change this option
1176 as now bzImage can be compiled as a completely relocatable image
1177 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1178 address. This option is mainly useful for the folks who don't want
1179 to use a bzImage for capturing the crash dump and want to use a
1180 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1181 to be specifically compiled to run from a specific memory area
1182 (normally a reserved region) and this option comes handy.
1184 So if you are using bzImage for capturing the crash dump, leave
1185 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1186 Otherwise if you plan to use vmlinux for capturing the crash dump
1187 change this value to start of the reserved region (Typically 16MB
1188 0x1000000). In other words, it can be set based on the "X" value as
1189 specified in the "crashkernel=YM@XM" command line boot parameter
1190 passed to the panic-ed kernel. Typically this parameter is set as
1191 crashkernel=64M@16M. Please take a look at
1192 Documentation/kdump/kdump.txt for more details about crash dumps.
1194 Usage of bzImage for capturing the crash dump is recommended as
1195 one does not have to build two kernels. Same kernel can be used
1196 as production kernel and capture kernel. Above option should have
1197 gone away after relocatable bzImage support is introduced. But it
1198 is present because there are users out there who continue to use
1199 vmlinux for dump capture. This option should go away down the
1202 Don't change this unless you know what you are doing.
1205 bool "Build a relocatable kernel (EXPERIMENTAL)"
1206 depends on EXPERIMENTAL
1208 This builds a kernel image that retains relocation information
1209 so it can be loaded someplace besides the default 1MB.
1210 The relocations tend to make the kernel binary about 10% larger,
1211 but are discarded at runtime.
1213 One use is for the kexec on panic case where the recovery kernel
1214 must live at a different physical address than the primary
1217 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1218 it has been loaded at and the compile time physical address
1219 (CONFIG_PHYSICAL_START) is ignored.
1221 config PHYSICAL_ALIGN
1223 prompt "Alignment value to which kernel should be aligned" if X86_32
1224 default "0x100000" if X86_32
1225 default "0x200000" if X86_64
1226 range 0x2000 0x400000
1228 This value puts the alignment restrictions on physical address
1229 where kernel is loaded and run from. Kernel is compiled for an
1230 address which meets above alignment restriction.
1232 If bootloader loads the kernel at a non-aligned address and
1233 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1234 address aligned to above value and run from there.
1236 If bootloader loads the kernel at a non-aligned address and
1237 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1238 load address and decompress itself to the address it has been
1239 compiled for and run from there. The address for which kernel is
1240 compiled already meets above alignment restrictions. Hence the
1241 end result is that kernel runs from a physical address meeting
1242 above alignment restrictions.
1244 Don't change this unless you know what you are doing.
1247 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1248 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1250 Say Y here to experiment with turning CPUs off and on, and to
1251 enable suspend on SMP systems. CPUs can be controlled through
1252 /sys/devices/system/cpu.
1253 Say N if you want to disable CPU hotplug and don't need to
1258 prompt "Compat VDSO support"
1259 depends on X86_32 || IA32_EMULATION
1261 Map the 32-bit VDSO to the predictable old-style address too.
1263 Say N here if you are running a sufficiently recent glibc
1264 version (2.3.3 or later), to remove the high-mapped
1265 VDSO mapping and to exclusively use the randomized VDSO.
1271 config ARCH_ENABLE_MEMORY_HOTPLUG
1273 depends on X86_64 || (X86_32 && HIGHMEM)
1275 config HAVE_ARCH_EARLY_PFN_TO_NID
1279 menu "Power management options"
1280 depends on !X86_VOYAGER
1282 config ARCH_HIBERNATION_HEADER
1284 depends on X86_64 && HIBERNATION
1286 source "kernel/power/Kconfig"
1288 source "drivers/acpi/Kconfig"
1293 depends on APM || APM_MODULE
1296 tristate "APM (Advanced Power Management) BIOS support"
1297 depends on X86_32 && PM_SLEEP && !X86_VISWS
1299 APM is a BIOS specification for saving power using several different
1300 techniques. This is mostly useful for battery powered laptops with
1301 APM compliant BIOSes. If you say Y here, the system time will be
1302 reset after a RESUME operation, the /proc/apm device will provide
1303 battery status information, and user-space programs will receive
1304 notification of APM "events" (e.g. battery status change).
1306 If you select "Y" here, you can disable actual use of the APM
1307 BIOS by passing the "apm=off" option to the kernel at boot time.
1309 Note that the APM support is almost completely disabled for
1310 machines with more than one CPU.
1312 In order to use APM, you will need supporting software. For location
1313 and more information, read <file:Documentation/power/pm.txt> and the
1314 Battery Powered Linux mini-HOWTO, available from
1315 <http://www.tldp.org/docs.html#howto>.
1317 This driver does not spin down disk drives (see the hdparm(8)
1318 manpage ("man 8 hdparm") for that), and it doesn't turn off
1319 VESA-compliant "green" monitors.
1321 This driver does not support the TI 4000M TravelMate and the ACER
1322 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1323 desktop machines also don't have compliant BIOSes, and this driver
1324 may cause those machines to panic during the boot phase.
1326 Generally, if you don't have a battery in your machine, there isn't
1327 much point in using this driver and you should say N. If you get
1328 random kernel OOPSes or reboots that don't seem to be related to
1329 anything, try disabling/enabling this option (or disabling/enabling
1332 Some other things you should try when experiencing seemingly random,
1335 1) make sure that you have enough swap space and that it is
1337 2) pass the "no-hlt" option to the kernel
1338 3) switch on floating point emulation in the kernel and pass
1339 the "no387" option to the kernel
1340 4) pass the "floppy=nodma" option to the kernel
1341 5) pass the "mem=4M" option to the kernel (thereby disabling
1342 all but the first 4 MB of RAM)
1343 6) make sure that the CPU is not over clocked.
1344 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1345 8) disable the cache from your BIOS settings
1346 9) install a fan for the video card or exchange video RAM
1347 10) install a better fan for the CPU
1348 11) exchange RAM chips
1349 12) exchange the motherboard.
1351 To compile this driver as a module, choose M here: the
1352 module will be called apm.
1356 config APM_IGNORE_USER_SUSPEND
1357 bool "Ignore USER SUSPEND"
1359 This option will ignore USER SUSPEND requests. On machines with a
1360 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1361 series notebooks, it is necessary to say Y because of a BIOS bug.
1363 config APM_DO_ENABLE
1364 bool "Enable PM at boot time"
1366 Enable APM features at boot time. From page 36 of the APM BIOS
1367 specification: "When disabled, the APM BIOS does not automatically
1368 power manage devices, enter the Standby State, enter the Suspend
1369 State, or take power saving steps in response to CPU Idle calls."
1370 This driver will make CPU Idle calls when Linux is idle (unless this
1371 feature is turned off -- see "Do CPU IDLE calls", below). This
1372 should always save battery power, but more complicated APM features
1373 will be dependent on your BIOS implementation. You may need to turn
1374 this option off if your computer hangs at boot time when using APM
1375 support, or if it beeps continuously instead of suspending. Turn
1376 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1377 T400CDT. This is off by default since most machines do fine without
1381 bool "Make CPU Idle calls when idle"
1383 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1384 On some machines, this can activate improved power savings, such as
1385 a slowed CPU clock rate, when the machine is idle. These idle calls
1386 are made after the idle loop has run for some length of time (e.g.,
1387 333 mS). On some machines, this will cause a hang at boot time or
1388 whenever the CPU becomes idle. (On machines with more than one CPU,
1389 this option does nothing.)
1391 config APM_DISPLAY_BLANK
1392 bool "Enable console blanking using APM"
1394 Enable console blanking using the APM. Some laptops can use this to
1395 turn off the LCD backlight when the screen blanker of the Linux
1396 virtual console blanks the screen. Note that this is only used by
1397 the virtual console screen blanker, and won't turn off the backlight
1398 when using the X Window system. This also doesn't have anything to
1399 do with your VESA-compliant power-saving monitor. Further, this
1400 option doesn't work for all laptops -- it might not turn off your
1401 backlight at all, or it might print a lot of errors to the console,
1402 especially if you are using gpm.
1404 config APM_ALLOW_INTS
1405 bool "Allow interrupts during APM BIOS calls"
1407 Normally we disable external interrupts while we are making calls to
1408 the APM BIOS as a measure to lessen the effects of a badly behaving
1409 BIOS implementation. The BIOS should reenable interrupts if it
1410 needs to. Unfortunately, some BIOSes do not -- especially those in
1411 many of the newer IBM Thinkpads. If you experience hangs when you
1412 suspend, try setting this to Y. Otherwise, say N.
1414 config APM_REAL_MODE_POWER_OFF
1415 bool "Use real mode APM BIOS call to power off"
1417 Use real mode APM BIOS calls to switch off the computer. This is
1418 a work-around for a number of buggy BIOSes. Switch this option on if
1419 your computer crashes instead of powering off properly.
1423 source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1425 source "drivers/cpuidle/Kconfig"
1430 menu "Bus options (PCI etc.)"
1433 bool "PCI support" if !X86_VISWS && !X86_VSMP
1434 depends on !X86_VOYAGER
1436 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1438 Find out whether you have a PCI motherboard. PCI is the name of a
1439 bus system, i.e. the way the CPU talks to the other stuff inside
1440 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1441 VESA. If you have PCI, say Y, otherwise N.
1444 prompt "PCI access mode"
1445 depends on X86_32 && PCI && !X86_VISWS
1448 On PCI systems, the BIOS can be used to detect the PCI devices and
1449 determine their configuration. However, some old PCI motherboards
1450 have BIOS bugs and may crash if this is done. Also, some embedded
1451 PCI-based systems don't have any BIOS at all. Linux can also try to
1452 detect the PCI hardware directly without using the BIOS.
1454 With this option, you can specify how Linux should detect the
1455 PCI devices. If you choose "BIOS", the BIOS will be used,
1456 if you choose "Direct", the BIOS won't be used, and if you
1457 choose "MMConfig", then PCI Express MMCONFIG will be used.
1458 If you choose "Any", the kernel will try MMCONFIG, then the
1459 direct access method and falls back to the BIOS if that doesn't
1460 work. If unsure, go with the default, which is "Any".
1465 config PCI_GOMMCONFIG
1478 depends on X86_32 && !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1480 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1483 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
1487 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
1494 bool "Support mmconfig PCI config space access"
1495 depends on X86_64 && PCI && ACPI
1498 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1499 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1501 DMA remapping (DMAR) devices support enables independent address
1502 translations for Direct Memory Access (DMA) from devices.
1503 These DMA remapping devices are reported via ACPI tables
1504 and include PCI device scope covered by these DMA
1509 prompt "Support for Graphics workaround"
1512 Current Graphics drivers tend to use physical address
1513 for DMA and avoid using DMA APIs. Setting this config
1514 option permits the IOMMU driver to set a unity map for
1515 all the OS-visible memory. Hence the driver can continue
1516 to use physical addresses for DMA.
1518 config DMAR_FLOPPY_WA
1522 Floppy disk drivers are know to bypass DMA API calls
1523 thereby failing to work when IOMMU is enabled. This
1524 workaround will setup a 1:1 mapping for the first
1525 16M to make floppy (an ISA device) work.
1527 source "drivers/pci/pcie/Kconfig"
1529 source "drivers/pci/Kconfig"
1531 # x86_64 have no ISA slots, but do have ISA-style DMA.
1539 depends on !(X86_VOYAGER || X86_VISWS)
1541 Find out whether you have ISA slots on your motherboard. ISA is the
1542 name of a bus system, i.e. the way the CPU talks to the other stuff
1543 inside your box. Other bus systems are PCI, EISA, MicroChannel
1544 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1545 newer boards don't support it. If you have ISA, say Y, otherwise N.
1551 The Extended Industry Standard Architecture (EISA) bus was
1552 developed as an open alternative to the IBM MicroChannel bus.
1554 The EISA bus provided some of the features of the IBM MicroChannel
1555 bus while maintaining backward compatibility with cards made for
1556 the older ISA bus. The EISA bus saw limited use between 1988 and
1557 1995 when it was made obsolete by the PCI bus.
1559 Say Y here if you are building a kernel for an EISA-based machine.
1563 source "drivers/eisa/Kconfig"
1566 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1567 default y if X86_VOYAGER
1569 MicroChannel Architecture is found in some IBM PS/2 machines and
1570 laptops. It is a bus system similar to PCI or ISA. See
1571 <file:Documentation/mca.txt> (and especially the web page given
1572 there) before attempting to build an MCA bus kernel.
1574 source "drivers/mca/Kconfig"
1577 tristate "NatSemi SCx200 support"
1578 depends on !X86_VOYAGER
1580 This provides basic support for National Semiconductor's
1581 (now AMD's) Geode processors. The driver probes for the
1582 PCI-IDs of several on-chip devices, so its a good dependency
1583 for other scx200_* drivers.
1585 If compiled as a module, the driver is named scx200.
1587 config SCx200HR_TIMER
1588 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1589 depends on SCx200 && GENERIC_TIME
1592 This driver provides a clocksource built upon the on-chip
1593 27MHz high-resolution timer. Its also a workaround for
1594 NSC Geode SC-1100's buggy TSC, which loses time when the
1595 processor goes idle (as is done by the scheduler). The
1596 other workaround is idle=poll boot option.
1598 config GEODE_MFGPT_TIMER
1600 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
1601 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
1603 This driver provides a clock event source based on the MFGPT
1604 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1605 MFGPTs have a better resolution and max interval than the
1606 generic PIT, and are suitable for use as high-res timers.
1612 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
1614 source "drivers/pcmcia/Kconfig"
1616 source "drivers/pci/hotplug/Kconfig"
1621 menu "Executable file formats / Emulations"
1623 source "fs/Kconfig.binfmt"
1625 config IA32_EMULATION
1626 bool "IA32 Emulation"
1628 select COMPAT_BINFMT_ELF
1630 Include code to run 32-bit programs under a 64-bit kernel. You should
1631 likely turn this on, unless you're 100% sure that you don't have any
1632 32-bit programs left.
1635 tristate "IA32 a.out support"
1636 depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
1638 Support old a.out binaries in the 32bit emulation.
1642 depends on IA32_EMULATION
1644 config COMPAT_FOR_U64_ALIGNMENT
1648 config SYSVIPC_COMPAT
1650 depends on X86_64 && COMPAT && SYSVIPC
1655 source "net/Kconfig"
1657 source "drivers/Kconfig"
1659 source "drivers/firmware/Kconfig"
1663 source "arch/x86/Kconfig.debug"
1665 source "security/Kconfig"
1667 source "crypto/Kconfig"
1669 source "arch/x86/kvm/Kconfig"
1671 source "lib/Kconfig"
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