2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
12 This is Linux's home port. Linux was originally native to the Intel
13 386, and runs on all the later x86 processors including the Intel
14 486, 586, Pentiums, and various instruction-set-compatible chips by
15 AMD, Cyrix, and others.
17 config SEMAPHORE_SLEEPERS
32 config GENERIC_ISA_DMA
40 config GENERIC_HWEIGHT
44 config ARCH_MAY_HAVE_PC_FDC
54 menu "Processor type and features"
57 bool "Symmetric multi-processing support"
59 This enables support for systems with more than one CPU. If you have
60 a system with only one CPU, like most personal computers, say N. If
61 you have a system with more than one CPU, say Y.
63 If you say N here, the kernel will run on single and multiprocessor
64 machines, but will use only one CPU of a multiprocessor machine. If
65 you say Y here, the kernel will run on many, but not all,
66 singleprocessor machines. On a singleprocessor machine, the kernel
67 will run faster if you say N here.
69 Note that if you say Y here and choose architecture "586" or
70 "Pentium" under "Processor family", the kernel will not work on 486
71 architectures. Similarly, multiprocessor kernels for the "PPro"
72 architecture may not work on all Pentium based boards.
74 People using multiprocessor machines who say Y here should also say
75 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
76 Management" code will be disabled if you say Y here.
78 See also the <file:Documentation/smp.txt>,
79 <file:Documentation/i386/IO-APIC.txt>,
80 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
81 <http://www.tldp.org/docs.html#howto>.
83 If you don't know what to do here, say N.
86 prompt "Subarchitecture Type"
92 Choose this option if your computer is a standard PC or compatible.
97 Select this for an AMD Elan processor.
99 Do not use this option for K6/Athlon/Opteron processors!
101 If unsure, choose "PC-compatible" instead.
106 Voyager is an MCA-based 32-way capable SMP architecture proprietary
107 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
111 If you do not specifically know you have a Voyager based machine,
112 say N here, otherwise the kernel you build will not be bootable.
115 bool "NUMAQ (IBM/Sequent)"
119 This option is used for getting Linux to run on a (IBM/Sequent) NUMA
120 multiquad box. This changes the way that processors are bootstrapped,
121 and uses Clustered Logical APIC addressing mode instead of Flat Logical.
122 You will need a new lynxer.elf file to flash your firmware with - send
123 email to <Martin.Bligh@us.ibm.com>.
126 bool "Summit/EXA (IBM x440)"
129 This option is needed for IBM systems that use the Summit/EXA chipset.
130 In particular, it is needed for the x440.
132 If you don't have one of these computers, you should say N here.
135 bool "Support for other sub-arch SMP systems with more than 8 CPUs"
138 This option is needed for the systems that have more than 8 CPUs
139 and if the system is not of any sub-arch type above.
141 If you don't have such a system, you should say N here.
144 bool "SGI 320/540 (Visual Workstation)"
146 The SGI Visual Workstation series is an IA32-based workstation
147 based on SGI systems chips with some legacy PC hardware attached.
149 Say Y here to create a kernel to run on the SGI 320 or 540.
151 A kernel compiled for the Visual Workstation will not run on PCs
152 and vice versa. See <file:Documentation/sgi-visws.txt> for details.
154 config X86_GENERICARCH
155 bool "Generic architecture (Summit, bigsmp, ES7000, default)"
158 This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
159 It is intended for a generic binary kernel.
162 bool "Support for Unisys ES7000 IA32 series"
165 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
166 supposed to run on an IA32-based Unisys ES7000 system.
167 Only choose this option if you have such a system, otherwise you
175 depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
177 config X86_SUMMIT_NUMA
180 depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
182 config X86_CYCLONE_TIMER
185 depends on X86_SUMMIT || X86_GENERICARCH
187 config ES7000_CLUSTERED_APIC
190 depends on SMP && X86_ES7000 && MPENTIUMIII
192 source "arch/i386/Kconfig.cpu"
195 bool "HPET Timer Support"
197 This enables the use of the HPET for the kernel's internal timer.
198 HPET is the next generation timer replacing legacy 8254s.
199 You can safely choose Y here. However, HPET will only be
200 activated if the platform and the BIOS support this feature.
201 Otherwise the 8254 will be used for timing services.
203 Choose N to continue using the legacy 8254 timer.
205 config HPET_EMULATE_RTC
207 depends on HPET_TIMER && RTC=y
211 int "Maximum number of CPUs (2-255)"
214 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
217 This allows you to specify the maximum number of CPUs which this
218 kernel will support. The maximum supported value is 255 and the
219 minimum value which makes sense is 2.
221 This is purely to save memory - each supported CPU adds
222 approximately eight kilobytes to the kernel image.
225 bool "SMT (Hyperthreading) scheduler support"
229 SMT scheduler support improves the CPU scheduler's decision making
230 when dealing with Intel Pentium 4 chips with HyperThreading at a
231 cost of slightly increased overhead in some places. If unsure say
235 bool "Multi-core scheduler support"
239 Multi-core scheduler support improves the CPU scheduler's decision
240 making when dealing with multi-core CPU chips at a cost of slightly
241 increased overhead in some places. If unsure say N here.
243 source "kernel/Kconfig.preempt"
246 bool "Local APIC support on uniprocessors"
247 depends on !SMP && !(X86_VISWS || X86_VOYAGER)
249 A local APIC (Advanced Programmable Interrupt Controller) is an
250 integrated interrupt controller in the CPU. If you have a single-CPU
251 system which has a processor with a local APIC, you can say Y here to
252 enable and use it. If you say Y here even though your machine doesn't
253 have a local APIC, then the kernel will still run with no slowdown at
254 all. The local APIC supports CPU-generated self-interrupts (timer,
255 performance counters), and the NMI watchdog which detects hard
259 bool "IO-APIC support on uniprocessors"
260 depends on X86_UP_APIC
262 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
263 SMP-capable replacement for PC-style interrupt controllers. Most
264 SMP systems and many recent uniprocessor systems have one.
266 If you have a single-CPU system with an IO-APIC, you can say Y here
267 to use it. If you say Y here even though your machine doesn't have
268 an IO-APIC, then the kernel will still run with no slowdown at all.
270 config X86_LOCAL_APIC
272 depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER)
277 depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
280 config X86_VISWS_APIC
286 bool "Machine Check Exception"
287 depends on !X86_VOYAGER
289 Machine Check Exception support allows the processor to notify the
290 kernel if it detects a problem (e.g. overheating, component failure).
291 The action the kernel takes depends on the severity of the problem,
292 ranging from a warning message on the console, to halting the machine.
293 Your processor must be a Pentium or newer to support this - check the
294 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
295 have a design flaw which leads to false MCE events - hence MCE is
296 disabled on all P5 processors, unless explicitly enabled with "mce"
297 as a boot argument. Similarly, if MCE is built in and creates a
298 problem on some new non-standard machine, you can boot with "nomce"
299 to disable it. MCE support simply ignores non-MCE processors like
300 the 386 and 486, so nearly everyone can say Y here.
302 config X86_MCE_NONFATAL
303 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
306 Enabling this feature starts a timer that triggers every 5 seconds which
307 will look at the machine check registers to see if anything happened.
308 Non-fatal problems automatically get corrected (but still logged).
309 Disable this if you don't want to see these messages.
310 Seeing the messages this option prints out may be indicative of dying hardware,
311 or out-of-spec (ie, overclocked) hardware.
312 This option only does something on certain CPUs.
313 (AMD Athlon/Duron and Intel Pentium 4)
315 config X86_MCE_P4THERMAL
316 bool "check for P4 thermal throttling interrupt."
317 depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
319 Enabling this feature will cause a message to be printed when the P4
320 enters thermal throttling.
323 tristate "Toshiba Laptop support"
325 This adds a driver to safely access the System Management Mode of
326 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
327 not work on models with a Phoenix BIOS. The System Management Mode
328 is used to set the BIOS and power saving options on Toshiba portables.
330 For information on utilities to make use of this driver see the
331 Toshiba Linux utilities web site at:
332 <http://www.buzzard.org.uk/toshiba/>.
334 Say Y if you intend to run this kernel on a Toshiba portable.
338 tristate "Dell laptop support"
340 This adds a driver to safely access the System Management Mode
341 of the CPU on the Dell Inspiron 8000. The System Management Mode
342 is used to read cpu temperature and cooling fan status and to
343 control the fans on the I8K portables.
345 This driver has been tested only on the Inspiron 8000 but it may
346 also work with other Dell laptops. You can force loading on other
347 models by passing the parameter `force=1' to the module. Use at
350 For information on utilities to make use of this driver see the
351 I8K Linux utilities web site at:
352 <http://people.debian.org/~dz/i8k/>
354 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
357 config X86_REBOOTFIXUPS
358 bool "Enable X86 board specific fixups for reboot"
362 This enables chipset and/or board specific fixups to be done
363 in order to get reboot to work correctly. This is only needed on
364 some combinations of hardware and BIOS. The symptom, for which
365 this config is intended, is when reboot ends with a stalled/hung
368 Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1.
371 Say Y if you want to enable the fixup. Currently, it's safe to
372 enable this option even if you don't need it.
376 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
378 If you say Y here and also to "/dev file system support" in the
379 'File systems' section, you will be able to update the microcode on
380 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
381 Pentium III, Pentium 4, Xeon etc. You will obviously need the
382 actual microcode binary data itself which is not shipped with the
385 For latest news and information on obtaining all the required
386 ingredients for this driver, check:
387 <http://www.urbanmyth.org/microcode/>.
389 To compile this driver as a module, choose M here: the
390 module will be called microcode.
393 tristate "/dev/cpu/*/msr - Model-specific register support"
395 This device gives privileged processes access to the x86
396 Model-Specific Registers (MSRs). It is a character device with
397 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
398 MSR accesses are directed to a specific CPU on multi-processor
402 tristate "/dev/cpu/*/cpuid - CPU information support"
404 This device gives processes access to the x86 CPUID instruction to
405 be executed on a specific processor. It is a character device
406 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
409 source "drivers/firmware/Kconfig"
412 prompt "High Memory Support"
417 depends on !X86_NUMAQ
419 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
420 However, the address space of 32-bit x86 processors is only 4
421 Gigabytes large. That means that, if you have a large amount of
422 physical memory, not all of it can be "permanently mapped" by the
423 kernel. The physical memory that's not permanently mapped is called
426 If you are compiling a kernel which will never run on a machine with
427 more than 1 Gigabyte total physical RAM, answer "off" here (default
428 choice and suitable for most users). This will result in a "3GB/1GB"
429 split: 3GB are mapped so that each process sees a 3GB virtual memory
430 space and the remaining part of the 4GB virtual memory space is used
431 by the kernel to permanently map as much physical memory as
434 If the machine has between 1 and 4 Gigabytes physical RAM, then
437 If more than 4 Gigabytes is used then answer "64GB" here. This
438 selection turns Intel PAE (Physical Address Extension) mode on.
439 PAE implements 3-level paging on IA32 processors. PAE is fully
440 supported by Linux, PAE mode is implemented on all recent Intel
441 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
442 then the kernel will not boot on CPUs that don't support PAE!
444 The actual amount of total physical memory will either be
445 auto detected or can be forced by using a kernel command line option
446 such as "mem=256M". (Try "man bootparam" or see the documentation of
447 your boot loader (lilo or loadlin) about how to pass options to the
448 kernel at boot time.)
450 If unsure, say "off".
454 depends on !X86_NUMAQ
456 Select this if you have a 32-bit processor and between 1 and 4
457 gigabytes of physical RAM.
461 depends on X86_CMPXCHG64
463 Select this if you have a 32-bit processor and more than 4
464 gigabytes of physical RAM.
469 depends on EXPERIMENTAL && !X86_PAE
470 prompt "Memory split"
473 Select the desired split between kernel and user memory.
475 If the address range available to the kernel is less than the
476 physical memory installed, the remaining memory will be available
477 as "high memory". Accessing high memory is a little more costly
478 than low memory, as it needs to be mapped into the kernel first.
479 Note that increasing the kernel address space limits the range
480 available to user programs, making the address space there
481 tighter. Selecting anything other than the default 3G/1G split
482 will also likely make your kernel incompatible with binary-only
485 If you are not absolutely sure what you are doing, leave this
489 bool "3G/1G user/kernel split"
490 config VMSPLIT_3G_OPT
491 bool "3G/1G user/kernel split (for full 1G low memory)"
493 bool "2G/2G user/kernel split"
495 bool "1G/3G user/kernel split"
500 default 0xB0000000 if VMSPLIT_3G_OPT
501 default 0x78000000 if VMSPLIT_2G
502 default 0x40000000 if VMSPLIT_1G
507 depends on HIGHMEM64G || HIGHMEM4G
512 depends on HIGHMEM64G
515 # Common NUMA Features
517 bool "Numa Memory Allocation and Scheduler Support"
518 depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
520 default y if (X86_NUMAQ || X86_SUMMIT)
522 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
523 depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
527 default "4" if X86_NUMAQ
529 depends on NEED_MULTIPLE_NODES
531 config HAVE_ARCH_BOOTMEM_NODE
536 config ARCH_HAVE_MEMORY_PRESENT
538 depends on DISCONTIGMEM
541 config NEED_NODE_MEMMAP_SIZE
543 depends on DISCONTIGMEM || SPARSEMEM
546 config HAVE_ARCH_ALLOC_REMAP
551 config ARCH_FLATMEM_ENABLE
553 depends on (ARCH_SELECT_MEMORY_MODEL && X86_PC)
555 config ARCH_DISCONTIGMEM_ENABLE
559 config ARCH_DISCONTIGMEM_DEFAULT
563 config ARCH_SPARSEMEM_ENABLE
565 depends on (NUMA || (X86_PC && EXPERIMENTAL))
566 select SPARSEMEM_STATIC
568 config ARCH_SELECT_MEMORY_MODEL
570 depends on ARCH_SPARSEMEM_ENABLE
574 config HAVE_ARCH_EARLY_PFN_TO_NID
580 bool "Allocate 3rd-level pagetables from highmem"
581 depends on HIGHMEM4G || HIGHMEM64G
583 The VM uses one page table entry for each page of physical memory.
584 For systems with a lot of RAM, this can be wasteful of precious
585 low memory. Setting this option will put user-space page table
586 entries in high memory.
588 config MATH_EMULATION
589 bool "Math emulation"
591 Linux can emulate a math coprocessor (used for floating point
592 operations) if you don't have one. 486DX and Pentium processors have
593 a math coprocessor built in, 486SX and 386 do not, unless you added
594 a 487DX or 387, respectively. (The messages during boot time can
595 give you some hints here ["man dmesg"].) Everyone needs either a
596 coprocessor or this emulation.
598 If you don't have a math coprocessor, you need to say Y here; if you
599 say Y here even though you have a coprocessor, the coprocessor will
600 be used nevertheless. (This behavior can be changed with the kernel
601 command line option "no387", which comes handy if your coprocessor
602 is broken. Try "man bootparam" or see the documentation of your boot
603 loader (lilo or loadlin) about how to pass options to the kernel at
604 boot time.) This means that it is a good idea to say Y here if you
605 intend to use this kernel on different machines.
607 More information about the internals of the Linux math coprocessor
608 emulation can be found in <file:arch/i386/math-emu/README>.
610 If you are not sure, say Y; apart from resulting in a 66 KB bigger
611 kernel, it won't hurt.
614 bool "MTRR (Memory Type Range Register) support"
616 On Intel P6 family processors (Pentium Pro, Pentium II and later)
617 the Memory Type Range Registers (MTRRs) may be used to control
618 processor access to memory ranges. This is most useful if you have
619 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
620 allows bus write transfers to be combined into a larger transfer
621 before bursting over the PCI/AGP bus. This can increase performance
622 of image write operations 2.5 times or more. Saying Y here creates a
623 /proc/mtrr file which may be used to manipulate your processor's
624 MTRRs. Typically the X server should use this.
626 This code has a reasonably generic interface so that similar
627 control registers on other processors can be easily supported
630 The Cyrix 6x86, 6x86MX and M II processors have Address Range
631 Registers (ARRs) which provide a similar functionality to MTRRs. For
632 these, the ARRs are used to emulate the MTRRs.
633 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
634 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
635 write-combining. All of these processors are supported by this code
636 and it makes sense to say Y here if you have one of them.
638 Saying Y here also fixes a problem with buggy SMP BIOSes which only
639 set the MTRRs for the boot CPU and not for the secondary CPUs. This
640 can lead to all sorts of problems, so it's good to say Y here.
642 You can safely say Y even if your machine doesn't have MTRRs, you'll
643 just add about 9 KB to your kernel.
645 See <file:Documentation/mtrr.txt> for more information.
648 bool "Boot from EFI support (EXPERIMENTAL)"
652 This enables the the kernel to boot on EFI platforms using
653 system configuration information passed to it from the firmware.
654 This also enables the kernel to use any EFI runtime services that are
655 available (such as the EFI variable services).
657 This option is only useful on systems that have EFI firmware
658 and will result in a kernel image that is ~8k larger. In addition,
659 you must use the latest ELILO loader available at
660 <http://elilo.sourceforge.net> in order to take advantage of
661 kernel initialization using EFI information (neither GRUB nor LILO know
662 anything about EFI). However, even with this option, the resultant
663 kernel should continue to boot on existing non-EFI platforms.
666 bool "Enable kernel irq balancing"
667 depends on SMP && X86_IO_APIC
670 The default yes will allow the kernel to do irq load balancing.
671 Saying no will keep the kernel from doing irq load balancing.
673 # turning this on wastes a bunch of space.
674 # Summit needs it only when NUMA is on
677 depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
681 bool "Use register arguments"
684 Compile the kernel with -mregparm=3. This instructs gcc to use
685 a more efficient function call ABI which passes the first three
686 arguments of a function call via registers, which results in denser
689 If this option is disabled, then the default ABI of passing
690 arguments via the stack is used.
695 bool "Enable seccomp to safely compute untrusted bytecode"
699 This kernel feature is useful for number crunching applications
700 that may need to compute untrusted bytecode during their
701 execution. By using pipes or other transports made available to
702 the process as file descriptors supporting the read/write
703 syscalls, it's possible to isolate those applications in
704 their own address space using seccomp. Once seccomp is
705 enabled via /proc/<pid>/seccomp, it cannot be disabled
706 and the task is only allowed to execute a few safe syscalls
707 defined by each seccomp mode.
709 If unsure, say Y. Only embedded should say N here.
711 source kernel/Kconfig.hz
714 bool "kexec system call (EXPERIMENTAL)"
715 depends on EXPERIMENTAL
717 kexec is a system call that implements the ability to shutdown your
718 current kernel, and to start another kernel. It is like a reboot
719 but it is indepedent of the system firmware. And like a reboot
720 you can start any kernel with it, not just Linux.
722 The name comes from the similiarity to the exec system call.
724 It is an ongoing process to be certain the hardware in a machine
725 is properly shutdown, so do not be surprised if this code does not
726 initially work for you. It may help to enable device hotplugging
727 support. As of this writing the exact hardware interface is
728 strongly in flux, so no good recommendation can be made.
731 bool "kernel crash dumps (EXPERIMENTAL)"
732 depends on EXPERIMENTAL
735 Generate crash dump after being started by kexec.
737 config PHYSICAL_START
738 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
740 default "0x1000000" if CRASH_DUMP
743 This gives the physical address where the kernel is loaded. Normally
744 for regular kernels this value is 0x100000 (1MB). But in the case
745 of kexec on panic the fail safe kernel needs to run at a different
746 address than the panic-ed kernel. This option is used to set the load
747 address for kernels used to capture crash dump on being kexec'ed
748 after panic. The default value for crash dump kernels is
749 0x1000000 (16MB). This can also be set based on the "X" value as
750 specified in the "crashkernel=YM@XM" command line boot parameter
751 passed to the panic-ed kernel. Typically this parameter is set as
752 crashkernel=64M@16M. Please take a look at
753 Documentation/kdump/kdump.txt for more details about crash dumps.
755 Don't change this unless you know what you are doing.
758 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
759 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER && !X86_PC
761 Say Y here to experiment with turning CPUs off and on. CPUs
762 can be controlled through /sys/devices/system/cpu.
769 menu "Power management options (ACPI, APM)"
770 depends on !X86_VOYAGER
772 source kernel/power/Kconfig
774 source "drivers/acpi/Kconfig"
776 menu "APM (Advanced Power Management) BIOS Support"
777 depends on PM && !X86_VISWS
780 tristate "APM (Advanced Power Management) BIOS support"
783 APM is a BIOS specification for saving power using several different
784 techniques. This is mostly useful for battery powered laptops with
785 APM compliant BIOSes. If you say Y here, the system time will be
786 reset after a RESUME operation, the /proc/apm device will provide
787 battery status information, and user-space programs will receive
788 notification of APM "events" (e.g. battery status change).
790 If you select "Y" here, you can disable actual use of the APM
791 BIOS by passing the "apm=off" option to the kernel at boot time.
793 Note that the APM support is almost completely disabled for
794 machines with more than one CPU.
796 In order to use APM, you will need supporting software. For location
797 and more information, read <file:Documentation/pm.txt> and the
798 Battery Powered Linux mini-HOWTO, available from
799 <http://www.tldp.org/docs.html#howto>.
801 This driver does not spin down disk drives (see the hdparm(8)
802 manpage ("man 8 hdparm") for that), and it doesn't turn off
803 VESA-compliant "green" monitors.
805 This driver does not support the TI 4000M TravelMate and the ACER
806 486/DX4/75 because they don't have compliant BIOSes. Many "green"
807 desktop machines also don't have compliant BIOSes, and this driver
808 may cause those machines to panic during the boot phase.
810 Generally, if you don't have a battery in your machine, there isn't
811 much point in using this driver and you should say N. If you get
812 random kernel OOPSes or reboots that don't seem to be related to
813 anything, try disabling/enabling this option (or disabling/enabling
816 Some other things you should try when experiencing seemingly random,
819 1) make sure that you have enough swap space and that it is
821 2) pass the "no-hlt" option to the kernel
822 3) switch on floating point emulation in the kernel and pass
823 the "no387" option to the kernel
824 4) pass the "floppy=nodma" option to the kernel
825 5) pass the "mem=4M" option to the kernel (thereby disabling
826 all but the first 4 MB of RAM)
827 6) make sure that the CPU is not over clocked.
828 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
829 8) disable the cache from your BIOS settings
830 9) install a fan for the video card or exchange video RAM
831 10) install a better fan for the CPU
832 11) exchange RAM chips
833 12) exchange the motherboard.
835 To compile this driver as a module, choose M here: the
836 module will be called apm.
838 config APM_IGNORE_USER_SUSPEND
839 bool "Ignore USER SUSPEND"
842 This option will ignore USER SUSPEND requests. On machines with a
843 compliant APM BIOS, you want to say N. However, on the NEC Versa M
844 series notebooks, it is necessary to say Y because of a BIOS bug.
847 bool "Enable PM at boot time"
850 Enable APM features at boot time. From page 36 of the APM BIOS
851 specification: "When disabled, the APM BIOS does not automatically
852 power manage devices, enter the Standby State, enter the Suspend
853 State, or take power saving steps in response to CPU Idle calls."
854 This driver will make CPU Idle calls when Linux is idle (unless this
855 feature is turned off -- see "Do CPU IDLE calls", below). This
856 should always save battery power, but more complicated APM features
857 will be dependent on your BIOS implementation. You may need to turn
858 this option off if your computer hangs at boot time when using APM
859 support, or if it beeps continuously instead of suspending. Turn
860 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
861 T400CDT. This is off by default since most machines do fine without
865 bool "Make CPU Idle calls when idle"
868 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
869 On some machines, this can activate improved power savings, such as
870 a slowed CPU clock rate, when the machine is idle. These idle calls
871 are made after the idle loop has run for some length of time (e.g.,
872 333 mS). On some machines, this will cause a hang at boot time or
873 whenever the CPU becomes idle. (On machines with more than one CPU,
874 this option does nothing.)
876 config APM_DISPLAY_BLANK
877 bool "Enable console blanking using APM"
880 Enable console blanking using the APM. Some laptops can use this to
881 turn off the LCD backlight when the screen blanker of the Linux
882 virtual console blanks the screen. Note that this is only used by
883 the virtual console screen blanker, and won't turn off the backlight
884 when using the X Window system. This also doesn't have anything to
885 do with your VESA-compliant power-saving monitor. Further, this
886 option doesn't work for all laptops -- it might not turn off your
887 backlight at all, or it might print a lot of errors to the console,
888 especially if you are using gpm.
890 config APM_RTC_IS_GMT
891 bool "RTC stores time in GMT"
894 Say Y here if your RTC (Real Time Clock a.k.a. hardware clock)
895 stores the time in GMT (Greenwich Mean Time). Say N if your RTC
898 It is in fact recommended to store GMT in your RTC, because then you
899 don't have to worry about daylight savings time changes. The only
900 reason not to use GMT in your RTC is if you also run a broken OS
901 that doesn't understand GMT.
903 config APM_ALLOW_INTS
904 bool "Allow interrupts during APM BIOS calls"
907 Normally we disable external interrupts while we are making calls to
908 the APM BIOS as a measure to lessen the effects of a badly behaving
909 BIOS implementation. The BIOS should reenable interrupts if it
910 needs to. Unfortunately, some BIOSes do not -- especially those in
911 many of the newer IBM Thinkpads. If you experience hangs when you
912 suspend, try setting this to Y. Otherwise, say N.
914 config APM_REAL_MODE_POWER_OFF
915 bool "Use real mode APM BIOS call to power off"
918 Use real mode APM BIOS calls to switch off the computer. This is
919 a work-around for a number of buggy BIOSes. Switch this option on if
920 your computer crashes instead of powering off properly.
924 source "arch/i386/kernel/cpu/cpufreq/Kconfig"
928 menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
931 bool "PCI support" if !X86_VISWS
932 depends on !X86_VOYAGER
933 default y if X86_VISWS
935 Find out whether you have a PCI motherboard. PCI is the name of a
936 bus system, i.e. the way the CPU talks to the other stuff inside
937 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
938 VESA. If you have PCI, say Y, otherwise N.
940 The PCI-HOWTO, available from
941 <http://www.tldp.org/docs.html#howto>, contains valuable
942 information about which PCI hardware does work under Linux and which
946 prompt "PCI access mode"
947 depends on PCI && !X86_VISWS
950 On PCI systems, the BIOS can be used to detect the PCI devices and
951 determine their configuration. However, some old PCI motherboards
952 have BIOS bugs and may crash if this is done. Also, some embedded
953 PCI-based systems don't have any BIOS at all. Linux can also try to
954 detect the PCI hardware directly without using the BIOS.
956 With this option, you can specify how Linux should detect the
957 PCI devices. If you choose "BIOS", the BIOS will be used,
958 if you choose "Direct", the BIOS won't be used, and if you
959 choose "MMConfig", then PCI Express MMCONFIG will be used.
960 If you choose "Any", the kernel will try MMCONFIG, then the
961 direct access method and falls back to the BIOS if that doesn't
962 work. If unsure, go with the default, which is "Any".
967 config PCI_GOMMCONFIG
980 depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
985 depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
990 depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
993 source "drivers/pci/pcie/Kconfig"
995 source "drivers/pci/Kconfig"
1003 depends on !(X86_VOYAGER || X86_VISWS)
1005 Find out whether you have ISA slots on your motherboard. ISA is the
1006 name of a bus system, i.e. the way the CPU talks to the other stuff
1007 inside your box. Other bus systems are PCI, EISA, MicroChannel
1008 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1009 newer boards don't support it. If you have ISA, say Y, otherwise N.
1015 The Extended Industry Standard Architecture (EISA) bus was
1016 developed as an open alternative to the IBM MicroChannel bus.
1018 The EISA bus provided some of the features of the IBM MicroChannel
1019 bus while maintaining backward compatibility with cards made for
1020 the older ISA bus. The EISA bus saw limited use between 1988 and
1021 1995 when it was made obsolete by the PCI bus.
1023 Say Y here if you are building a kernel for an EISA-based machine.
1027 source "drivers/eisa/Kconfig"
1030 bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1031 default y if X86_VOYAGER
1033 MicroChannel Architecture is found in some IBM PS/2 machines and
1034 laptops. It is a bus system similar to PCI or ISA. See
1035 <file:Documentation/mca.txt> (and especially the web page given
1036 there) before attempting to build an MCA bus kernel.
1038 source "drivers/mca/Kconfig"
1041 tristate "NatSemi SCx200 support"
1042 depends on !X86_VOYAGER
1044 This provides basic support for the National Semiconductor SCx200
1045 processor. Right now this is just a driver for the GPIO pins.
1047 If you don't know what to do here, say N.
1049 This support is also available as a module. If compiled as a
1050 module, it will be called scx200.
1052 source "drivers/pcmcia/Kconfig"
1054 source "drivers/pci/hotplug/Kconfig"
1058 menu "Executable file formats"
1060 source "fs/Kconfig.binfmt"
1064 source "net/Kconfig"
1066 source "drivers/Kconfig"
1070 menu "Instrumentation Support"
1071 depends on EXPERIMENTAL
1073 source "arch/i386/oprofile/Kconfig"
1076 bool "Kprobes (EXPERIMENTAL)"
1077 depends on EXPERIMENTAL && MODULES
1079 Kprobes allows you to trap at almost any kernel address and
1080 execute a callback function. register_kprobe() establishes
1081 a probepoint and specifies the callback. Kprobes is useful
1082 for kernel debugging, non-intrusive instrumentation and testing.
1083 If in doubt, say "N".
1086 source "arch/i386/Kconfig.debug"
1088 source "security/Kconfig"
1090 source "crypto/Kconfig"
1092 source "lib/Kconfig"
1095 # Use the generic interrupt handling code in kernel/irq/:
1097 config GENERIC_HARDIRQS
1101 config GENERIC_IRQ_PROBE
1105 config GENERIC_PENDING_IRQ
1107 depends on GENERIC_HARDIRQS && SMP
1112 depends on SMP && !X86_VOYAGER
1117 depends on SMP && !(X86_VISWS || X86_VOYAGER)
1120 config X86_BIOS_REBOOT
1122 depends on !(X86_VISWS || X86_VOYAGER)
1125 config X86_TRAMPOLINE
1127 depends on X86_SMP || (X86_VOYAGER && SMP)
projects / linux-2.6 / blob