1304 lines
42 KiB
Plaintext
1304 lines
42 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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#
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mainmenu "Linux Kernel Configuration"
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config X86_32
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bool
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default y
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help
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This is Linux's home port. Linux was originally native to the Intel
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386, and runs on all the later x86 processors including the Intel
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486, 586, Pentiums, and various instruction-set-compatible chips by
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AMD, Cyrix, and others.
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config GENERIC_TIME
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bool
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default y
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config GENERIC_CMOS_UPDATE
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bool
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default y
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config CLOCKSOURCE_WATCHDOG
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bool
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default y
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config GENERIC_CLOCKEVENTS
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bool
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default y
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config GENERIC_CLOCKEVENTS_BROADCAST
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bool
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default y
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depends on X86_LOCAL_APIC
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config LOCKDEP_SUPPORT
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bool
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default y
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config STACKTRACE_SUPPORT
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bool
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default y
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config SEMAPHORE_SLEEPERS
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bool
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default y
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config X86
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bool
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default y
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config MMU
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bool
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default y
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config ZONE_DMA
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bool
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default y
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config QUICKLIST
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bool
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default y
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config SBUS
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bool
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config GENERIC_ISA_DMA
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bool
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default y
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config GENERIC_IOMAP
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bool
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default y
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config GENERIC_BUG
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bool
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default y
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depends on BUG
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config GENERIC_HWEIGHT
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bool
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default y
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config ARCH_MAY_HAVE_PC_FDC
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bool
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default y
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config DMI
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bool
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default y
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source "init/Kconfig"
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menu "Processor type and features"
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source "kernel/time/Kconfig"
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config SMP
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bool "Symmetric multi-processing support"
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on many, but not all,
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singleprocessor machines. On a singleprocessor machine, the kernel
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will run faster if you say N here.
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Note that if you say Y here and choose architecture "586" or
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"Pentium" under "Processor family", the kernel will not work on 486
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architectures. Similarly, multiprocessor kernels for the "PPro"
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architecture may not work on all Pentium based boards.
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People using multiprocessor machines who say Y here should also say
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Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
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Management" code will be disabled if you say Y here.
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See also the <file:Documentation/smp.txt>,
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<file:Documentation/i386/IO-APIC.txt>,
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<file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
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<http://www.tldp.org/docs.html#howto>.
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If you don't know what to do here, say N.
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choice
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prompt "Subarchitecture Type"
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default X86_PC
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config X86_PC
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bool "PC-compatible"
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help
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Choose this option if your computer is a standard PC or compatible.
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config X86_ELAN
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bool "AMD Elan"
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help
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Select this for an AMD Elan processor.
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Do not use this option for K6/Athlon/Opteron processors!
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If unsure, choose "PC-compatible" instead.
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config X86_VOYAGER
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bool "Voyager (NCR)"
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help
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Voyager is an MCA-based 32-way capable SMP architecture proprietary
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to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
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*** WARNING ***
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If you do not specifically know you have a Voyager based machine,
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say N here, otherwise the kernel you build will not be bootable.
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config X86_NUMAQ
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bool "NUMAQ (IBM/Sequent)"
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select SMP
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select NUMA
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help
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This option is used for getting Linux to run on a (IBM/Sequent) NUMA
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multiquad box. This changes the way that processors are bootstrapped,
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and uses Clustered Logical APIC addressing mode instead of Flat Logical.
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You will need a new lynxer.elf file to flash your firmware with - send
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email to <Martin.Bligh@us.ibm.com>.
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config X86_SUMMIT
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bool "Summit/EXA (IBM x440)"
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depends on SMP
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help
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This option is needed for IBM systems that use the Summit/EXA chipset.
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In particular, it is needed for the x440.
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If you don't have one of these computers, you should say N here.
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If you want to build a NUMA kernel, you must select ACPI.
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config X86_BIGSMP
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bool "Support for other sub-arch SMP systems with more than 8 CPUs"
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depends on SMP
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help
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This option is needed for the systems that have more than 8 CPUs
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and if the system is not of any sub-arch type above.
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If you don't have such a system, you should say N here.
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config X86_VISWS
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bool "SGI 320/540 (Visual Workstation)"
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help
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The SGI Visual Workstation series is an IA32-based workstation
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based on SGI systems chips with some legacy PC hardware attached.
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Say Y here to create a kernel to run on the SGI 320 or 540.
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A kernel compiled for the Visual Workstation will not run on PCs
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and vice versa. See <file:Documentation/sgi-visws.txt> for details.
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config X86_GENERICARCH
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bool "Generic architecture (Summit, bigsmp, ES7000, default)"
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help
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This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
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It is intended for a generic binary kernel.
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If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
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config X86_ES7000
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bool "Support for Unisys ES7000 IA32 series"
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depends on SMP
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help
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Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
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supposed to run on an IA32-based Unisys ES7000 system.
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Only choose this option if you have such a system, otherwise you
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should say N here.
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endchoice
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config PARAVIRT
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bool "Paravirtualization support (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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depends on !(X86_VISWS || X86_VOYAGER)
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help
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Paravirtualization is a way of running multiple instances of
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Linux on the same machine, under a hypervisor. This option
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changes the kernel so it can modify itself when it is run
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under a hypervisor, improving performance significantly.
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However, when run without a hypervisor the kernel is
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theoretically slower. If in doubt, say N.
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source "arch/i386/xen/Kconfig"
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config VMI
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bool "VMI Paravirt-ops support"
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depends on PARAVIRT
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help
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VMI provides a paravirtualized interface to the VMware ESX server
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(it could be used by other hypervisors in theory too, but is not
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at the moment), by linking the kernel to a GPL-ed ROM module
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provided by the hypervisor.
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config ACPI_SRAT
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bool
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default y
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depends on ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
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select ACPI_NUMA
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config HAVE_ARCH_PARSE_SRAT
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bool
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default y
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depends on ACPI_SRAT
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config X86_SUMMIT_NUMA
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bool
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default y
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depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
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config X86_CYCLONE_TIMER
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bool
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default y
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depends on X86_SUMMIT || X86_GENERICARCH
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config ES7000_CLUSTERED_APIC
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bool
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default y
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depends on SMP && X86_ES7000 && MPENTIUMIII
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source "arch/i386/Kconfig.cpu"
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config HPET_TIMER
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bool "HPET Timer Support"
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help
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This enables the use of the HPET for the kernel's internal timer.
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HPET is the next generation timer replacing legacy 8254s.
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You can safely choose Y here. However, HPET will only be
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activated if the platform and the BIOS support this feature.
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Otherwise the 8254 will be used for timing services.
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Choose N to continue using the legacy 8254 timer.
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config HPET_EMULATE_RTC
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bool
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depends on HPET_TIMER && RTC=y
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default y
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config NR_CPUS
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int "Maximum number of CPUs (2-255)"
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range 2 255
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depends on SMP
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default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
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default "8"
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help
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This allows you to specify the maximum number of CPUs which this
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kernel will support. The maximum supported value is 255 and the
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minimum value which makes sense is 2.
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This is purely to save memory - each supported CPU adds
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approximately eight kilobytes to the kernel image.
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config SCHED_SMT
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bool "SMT (Hyperthreading) scheduler support"
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depends on X86_HT
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help
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SMT scheduler support improves the CPU scheduler's decision making
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when dealing with Intel Pentium 4 chips with HyperThreading at a
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cost of slightly increased overhead in some places. If unsure say
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N here.
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config SCHED_MC
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bool "Multi-core scheduler support"
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depends on X86_HT
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default y
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help
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Multi-core scheduler support improves the CPU scheduler's decision
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making when dealing with multi-core CPU chips at a cost of slightly
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increased overhead in some places. If unsure say N here.
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source "kernel/Kconfig.preempt"
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config X86_UP_APIC
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bool "Local APIC support on uniprocessors"
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depends on !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
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help
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A local APIC (Advanced Programmable Interrupt Controller) is an
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integrated interrupt controller in the CPU. If you have a single-CPU
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system which has a processor with a local APIC, you can say Y here to
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enable and use it. If you say Y here even though your machine doesn't
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have a local APIC, then the kernel will still run with no slowdown at
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all. The local APIC supports CPU-generated self-interrupts (timer,
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performance counters), and the NMI watchdog which detects hard
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lockups.
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config X86_UP_IOAPIC
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bool "IO-APIC support on uniprocessors"
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depends on X86_UP_APIC
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help
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An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
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SMP-capable replacement for PC-style interrupt controllers. Most
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SMP systems and many recent uniprocessor systems have one.
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If you have a single-CPU system with an IO-APIC, you can say Y here
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to use it. If you say Y here even though your machine doesn't have
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an IO-APIC, then the kernel will still run with no slowdown at all.
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config X86_LOCAL_APIC
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bool
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depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH
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default y
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config X86_IO_APIC
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bool
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depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH
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default y
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config X86_VISWS_APIC
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bool
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depends on X86_VISWS
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default y
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config X86_MCE
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bool "Machine Check Exception"
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depends on !X86_VOYAGER
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---help---
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Machine Check Exception support allows the processor to notify the
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kernel if it detects a problem (e.g. overheating, component failure).
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The action the kernel takes depends on the severity of the problem,
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ranging from a warning message on the console, to halting the machine.
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Your processor must be a Pentium or newer to support this - check the
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flags in /proc/cpuinfo for mce. Note that some older Pentium systems
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have a design flaw which leads to false MCE events - hence MCE is
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disabled on all P5 processors, unless explicitly enabled with "mce"
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as a boot argument. Similarly, if MCE is built in and creates a
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problem on some new non-standard machine, you can boot with "nomce"
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to disable it. MCE support simply ignores non-MCE processors like
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the 386 and 486, so nearly everyone can say Y here.
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config X86_MCE_NONFATAL
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tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
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depends on X86_MCE
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help
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Enabling this feature starts a timer that triggers every 5 seconds which
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will look at the machine check registers to see if anything happened.
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Non-fatal problems automatically get corrected (but still logged).
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Disable this if you don't want to see these messages.
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Seeing the messages this option prints out may be indicative of dying hardware,
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or out-of-spec (ie, overclocked) hardware.
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This option only does something on certain CPUs.
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(AMD Athlon/Duron and Intel Pentium 4)
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config X86_MCE_P4THERMAL
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bool "check for P4 thermal throttling interrupt."
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depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
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help
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Enabling this feature will cause a message to be printed when the P4
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enters thermal throttling.
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config VM86
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default y
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bool "Enable VM86 support" if EMBEDDED
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help
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This option is required by programs like DOSEMU to run 16-bit legacy
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code on X86 processors. It also may be needed by software like
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XFree86 to initialize some video cards via BIOS. Disabling this
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option saves about 6k.
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config TOSHIBA
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tristate "Toshiba Laptop support"
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---help---
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This adds a driver to safely access the System Management Mode of
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the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
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not work on models with a Phoenix BIOS. The System Management Mode
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is used to set the BIOS and power saving options on Toshiba portables.
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For information on utilities to make use of this driver see the
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Toshiba Linux utilities web site at:
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<http://www.buzzard.org.uk/toshiba/>.
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Say Y if you intend to run this kernel on a Toshiba portable.
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Say N otherwise.
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config I8K
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tristate "Dell laptop support"
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---help---
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This adds a driver to safely access the System Management Mode
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of the CPU on the Dell Inspiron 8000. The System Management Mode
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is used to read cpu temperature and cooling fan status and to
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control the fans on the I8K portables.
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This driver has been tested only on the Inspiron 8000 but it may
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also work with other Dell laptops. You can force loading on other
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models by passing the parameter `force=1' to the module. Use at
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your own risk.
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For information on utilities to make use of this driver see the
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I8K Linux utilities web site at:
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<http://people.debian.org/~dz/i8k/>
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Say Y if you intend to run this kernel on a Dell Inspiron 8000.
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Say N otherwise.
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config X86_REBOOTFIXUPS
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bool "Enable X86 board specific fixups for reboot"
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depends on X86
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default n
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---help---
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This enables chipset and/or board specific fixups to be done
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in order to get reboot to work correctly. This is only needed on
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some combinations of hardware and BIOS. The symptom, for which
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this config is intended, is when reboot ends with a stalled/hung
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system.
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Currently, the only fixup is for the Geode machines using
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CS5530A and CS5536 chipsets.
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Say Y if you want to enable the fixup. Currently, it's safe to
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enable this option even if you don't need it.
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Say N otherwise.
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config MICROCODE
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tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
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select FW_LOADER
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---help---
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If you say Y here, you will be able to update the microcode on
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Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
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Pentium III, Pentium 4, Xeon etc. You will obviously need the
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actual microcode binary data itself which is not shipped with the
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Linux kernel.
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For latest news and information on obtaining all the required
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ingredients for this driver, check:
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<http://www.urbanmyth.org/microcode/>.
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To compile this driver as a module, choose M here: the
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module will be called microcode.
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config MICROCODE_OLD_INTERFACE
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bool
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depends on MICROCODE
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default y
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config X86_MSR
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tristate "/dev/cpu/*/msr - Model-specific register support"
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help
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This device gives privileged processes access to the x86
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Model-Specific Registers (MSRs). It is a character device with
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major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
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MSR accesses are directed to a specific CPU on multi-processor
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systems.
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config X86_CPUID
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tristate "/dev/cpu/*/cpuid - CPU information support"
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help
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This device gives processes access to the x86 CPUID instruction to
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be executed on a specific processor. It is a character device
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with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
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/dev/cpu/31/cpuid.
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source "drivers/firmware/Kconfig"
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choice
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prompt "High Memory Support"
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default HIGHMEM4G if !X86_NUMAQ
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default HIGHMEM64G if X86_NUMAQ
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config NOHIGHMEM
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bool "off"
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depends on !X86_NUMAQ
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---help---
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Linux can use up to 64 Gigabytes of physical memory on x86 systems.
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However, the address space of 32-bit x86 processors is only 4
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Gigabytes large. That means that, if you have a large amount of
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physical memory, not all of it can be "permanently mapped" by the
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kernel. The physical memory that's not permanently mapped is called
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"high memory".
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If you are compiling a kernel which will never run on a machine with
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more than 1 Gigabyte total physical RAM, answer "off" here (default
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choice and suitable for most users). This will result in a "3GB/1GB"
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split: 3GB are mapped so that each process sees a 3GB virtual memory
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space and the remaining part of the 4GB virtual memory space is used
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by the kernel to permanently map as much physical memory as
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possible.
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If the machine has between 1 and 4 Gigabytes physical RAM, then
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answer "4GB" here.
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If more than 4 Gigabytes is used then answer "64GB" here. This
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selection turns Intel PAE (Physical Address Extension) mode on.
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PAE implements 3-level paging on IA32 processors. PAE is fully
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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
|
|
help
|
|
Select this if you have a 32-bit processor and between 1 and 4
|
|
gigabytes of physical RAM.
|
|
|
|
config HIGHMEM64G
|
|
bool "64GB"
|
|
depends on !M386 && !M486
|
|
select X86_PAE
|
|
help
|
|
Select this if you have a 32-bit processor and more than 4
|
|
gigabytes of physical RAM.
|
|
|
|
endchoice
|
|
|
|
choice
|
|
depends on EXPERIMENTAL
|
|
prompt "Memory split" if EMBEDDED
|
|
default VMSPLIT_3G
|
|
help
|
|
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"
|
|
config VMSPLIT_3G_OPT
|
|
depends on !X86_PAE
|
|
bool "3G/1G user/kernel split (for full 1G low memory)"
|
|
config VMSPLIT_2G
|
|
bool "2G/2G user/kernel split"
|
|
config VMSPLIT_2G_OPT
|
|
depends on !X86_PAE
|
|
bool "2G/2G user/kernel split (for full 2G low memory)"
|
|
config VMSPLIT_1G
|
|
bool "1G/3G user/kernel split"
|
|
endchoice
|
|
|
|
config PAGE_OFFSET
|
|
hex
|
|
default 0xB0000000 if VMSPLIT_3G_OPT
|
|
default 0x80000000 if VMSPLIT_2G
|
|
default 0x78000000 if VMSPLIT_2G_OPT
|
|
default 0x40000000 if VMSPLIT_1G
|
|
default 0xC0000000
|
|
|
|
config HIGHMEM
|
|
bool
|
|
depends on HIGHMEM64G || HIGHMEM4G
|
|
default y
|
|
|
|
config X86_PAE
|
|
bool "PAE (Physical Address Extension) Support"
|
|
default n
|
|
depends on !HIGHMEM4G
|
|
select RESOURCES_64BIT
|
|
help
|
|
PAE is required for NX support, and furthermore enables
|
|
larger swapspace support for non-overcommit purposes. It
|
|
has the cost of more pagetable lookup overhead, and also
|
|
consumes more pagetable space per process.
|
|
|
|
# Common NUMA Features
|
|
config NUMA
|
|
bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
|
|
depends on SMP && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL
|
|
default n if X86_PC
|
|
default y if (X86_NUMAQ || X86_SUMMIT)
|
|
help
|
|
NUMA support for i386. This is currently high experimental
|
|
and should be only used for kernel development. It might also
|
|
cause boot failures.
|
|
|
|
comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
|
|
depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
|
|
|
|
config NODES_SHIFT
|
|
int
|
|
default "4" if X86_NUMAQ
|
|
default "3"
|
|
depends on NEED_MULTIPLE_NODES
|
|
|
|
config HAVE_ARCH_BOOTMEM_NODE
|
|
bool
|
|
depends on NUMA
|
|
default y
|
|
|
|
config ARCH_HAVE_MEMORY_PRESENT
|
|
bool
|
|
depends on DISCONTIGMEM
|
|
default y
|
|
|
|
config NEED_NODE_MEMMAP_SIZE
|
|
bool
|
|
depends on DISCONTIGMEM || SPARSEMEM
|
|
default y
|
|
|
|
config HAVE_ARCH_ALLOC_REMAP
|
|
bool
|
|
depends on NUMA
|
|
default y
|
|
|
|
config ARCH_FLATMEM_ENABLE
|
|
def_bool y
|
|
depends on (ARCH_SELECT_MEMORY_MODEL && X86_PC)
|
|
|
|
config ARCH_DISCONTIGMEM_ENABLE
|
|
def_bool y
|
|
depends on NUMA
|
|
|
|
config ARCH_DISCONTIGMEM_DEFAULT
|
|
def_bool y
|
|
depends on NUMA
|
|
|
|
config ARCH_SPARSEMEM_ENABLE
|
|
def_bool y
|
|
depends on (NUMA || (X86_PC && EXPERIMENTAL))
|
|
select SPARSEMEM_STATIC
|
|
|
|
config ARCH_SELECT_MEMORY_MODEL
|
|
def_bool y
|
|
depends on ARCH_SPARSEMEM_ENABLE
|
|
|
|
config ARCH_POPULATES_NODE_MAP
|
|
def_bool y
|
|
|
|
source "mm/Kconfig"
|
|
|
|
config HIGHPTE
|
|
bool "Allocate 3rd-level pagetables from highmem"
|
|
depends on HIGHMEM4G || HIGHMEM64G
|
|
help
|
|
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.
|
|
|
|
config MATH_EMULATION
|
|
bool "Math emulation"
|
|
---help---
|
|
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"
|
|
---help---
|
|
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
|
|
---help---
|
|
This enables 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
|
|
<http://elilo.sourceforge.net> 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.
|
|
|
|
config IRQBALANCE
|
|
bool "Enable kernel irq balancing"
|
|
depends on SMP && X86_IO_APIC
|
|
default y
|
|
help
|
|
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
|
|
config BOOT_IOREMAP
|
|
bool
|
|
depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
|
|
default y
|
|
|
|
config SECCOMP
|
|
bool "Enable seccomp to safely compute untrusted bytecode"
|
|
depends on PROC_FS
|
|
default y
|
|
help
|
|
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"
|
|
help
|
|
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.
|
|
|
|
config CRASH_DUMP
|
|
bool "kernel crash dumps (EXPERIMENTAL)"
|
|
depends on EXPERIMENTAL
|
|
depends on HIGHMEM
|
|
help
|
|
Generate crash dump after being started by kexec.
|
|
This should be normally only set in special crash dump kernels
|
|
which are loaded in the main kernel with kexec-tools into
|
|
a specially reserved region and then later executed after
|
|
a crash by kdump/kexec. The crash dump kernel must be compiled
|
|
to a memory address not used by the main kernel or BIOS using
|
|
PHYSICAL_START.
|
|
For more details see Documentation/kdump/kdump.txt
|
|
|
|
config PHYSICAL_START
|
|
hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
|
|
default "0x1000000" if X86_NUMAQ
|
|
default "0x100000"
|
|
help
|
|
This gives the physical address where the kernel is loaded.
|
|
|
|
If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
|
|
bzImage will decompress itself to above physical address and
|
|
run from there. Otherwise, bzImage will run from the address where
|
|
it has been loaded by the boot loader and will ignore above physical
|
|
address.
|
|
|
|
In normal kdump cases one does not have to set/change this option
|
|
as now bzImage can be compiled as a completely relocatable image
|
|
(CONFIG_RELOCATABLE=y) and be used to load and run from a different
|
|
address. This option is mainly useful for the folks who don't want
|
|
to use a bzImage for capturing the crash dump and want to use a
|
|
vmlinux instead. vmlinux is not relocatable hence a kernel needs
|
|
to be specifically compiled to run from a specific memory area
|
|
(normally a reserved region) and this option comes handy.
|
|
|
|
So if you are using bzImage for capturing the crash dump, leave
|
|
the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
|
|
Otherwise if you plan to use vmlinux for capturing the crash dump
|
|
change this value to start of the reserved region (Typically 16MB
|
|
0x1000000). In other words, it can 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.
|
|
|
|
Usage of bzImage for capturing the crash dump is recommended as
|
|
one does not have to build two kernels. Same kernel can be used
|
|
as production kernel and capture kernel. Above option should have
|
|
gone away after relocatable bzImage support is introduced. But it
|
|
is present because there are users out there who continue to use
|
|
vmlinux for dump capture. This option should go away down the
|
|
line.
|
|
|
|
Don't change this unless you know what you are doing.
|
|
|
|
config RELOCATABLE
|
|
bool "Build a relocatable kernel(EXPERIMENTAL)"
|
|
depends on EXPERIMENTAL
|
|
help
|
|
This builds a kernel image that retains relocation information
|
|
so it can be loaded someplace besides the default 1MB.
|
|
The relocations tend to make the kernel binary about 10% larger,
|
|
but are discarded at runtime.
|
|
|
|
One use is for the kexec on panic case where the recovery kernel
|
|
must live at a different physical address than the primary
|
|
kernel.
|
|
|
|
config PHYSICAL_ALIGN
|
|
hex "Alignment value to which kernel should be aligned"
|
|
default "0x100000"
|
|
range 0x2000 0x400000
|
|
help
|
|
This value puts the alignment restrictions on physical address
|
|
where kernel is loaded and run from. Kernel is compiled for an
|
|
address which meets above alignment restriction.
|
|
|
|
If bootloader loads the kernel at a non-aligned address and
|
|
CONFIG_RELOCATABLE is set, kernel will move itself to nearest
|
|
address aligned to above value and run from there.
|
|
|
|
If bootloader loads the kernel at a non-aligned address and
|
|
CONFIG_RELOCATABLE is not set, kernel will ignore the run time
|
|
load address and decompress itself to the address it has been
|
|
compiled for and run from there. The address for which kernel is
|
|
compiled already meets above alignment restrictions. Hence the
|
|
end result is that kernel runs from a physical address meeting
|
|
above alignment restrictions.
|
|
|
|
Don't change this unless you know what you are doing.
|
|
|
|
config HOTPLUG_CPU
|
|
bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
|
|
depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
|
|
---help---
|
|
Say Y here to experiment with turning CPUs off and on, and to
|
|
enable suspend on SMP systems. CPUs can be controlled through
|
|
/sys/devices/system/cpu.
|
|
|
|
config COMPAT_VDSO
|
|
bool "Compat VDSO support"
|
|
default y
|
|
help
|
|
Map the VDSO to the predictable old-style address too.
|
|
---help---
|
|
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.
|
|
|
|
endmenu
|
|
|
|
config ARCH_ENABLE_MEMORY_HOTPLUG
|
|
def_bool y
|
|
depends on HIGHMEM
|
|
|
|
menu "Power management options (ACPI, APM)"
|
|
depends on !X86_VOYAGER
|
|
|
|
source kernel/power/Kconfig
|
|
|
|
source "drivers/acpi/Kconfig"
|
|
|
|
menuconfig APM
|
|
tristate "APM (Advanced Power Management) BIOS support"
|
|
depends on PM_SLEEP && !X86_VISWS
|
|
---help---
|
|
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
|
|
<http://www.tldp.org/docs.html#howto>.
|
|
|
|
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
|
|
enabled.
|
|
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 <http://www.bitwizard.nl/sig11/>
|
|
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.
|
|
|
|
if APM
|
|
|
|
config APM_IGNORE_USER_SUSPEND
|
|
bool "Ignore USER SUSPEND"
|
|
help
|
|
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.
|
|
|
|
config APM_DO_ENABLE
|
|
bool "Enable PM at boot time"
|
|
---help---
|
|
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.
|
|
|
|
config APM_CPU_IDLE
|
|
bool "Make CPU Idle calls when idle"
|
|
help
|
|
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.)
|
|
|
|
config APM_DISPLAY_BLANK
|
|
bool "Enable console blanking using APM"
|
|
help
|
|
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.
|
|
|
|
config APM_ALLOW_INTS
|
|
bool "Allow interrupts during APM BIOS calls"
|
|
help
|
|
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.
|
|
|
|
config APM_REAL_MODE_POWER_OFF
|
|
bool "Use real mode APM BIOS call to power off"
|
|
help
|
|
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.
|
|
|
|
endif # APM
|
|
|
|
source "arch/i386/kernel/cpu/cpufreq/Kconfig"
|
|
|
|
endmenu
|
|
|
|
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
|
|
select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
|
|
help
|
|
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
|
|
<http://www.tldp.org/docs.html#howto>, contains valuable
|
|
information about which PCI hardware does work under Linux and which
|
|
doesn't.
|
|
|
|
choice
|
|
prompt "PCI access mode"
|
|
depends on PCI && !X86_VISWS
|
|
default PCI_GOANY
|
|
---help---
|
|
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".
|
|
|
|
config PCI_GOBIOS
|
|
bool "BIOS"
|
|
|
|
config PCI_GOMMCONFIG
|
|
bool "MMConfig"
|
|
|
|
config PCI_GODIRECT
|
|
bool "Direct"
|
|
|
|
config PCI_GOANY
|
|
bool "Any"
|
|
|
|
endchoice
|
|
|
|
config PCI_BIOS
|
|
bool
|
|
depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
|
|
default y
|
|
|
|
config PCI_DIRECT
|
|
bool
|
|
depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
|
|
default y
|
|
|
|
config PCI_MMCONFIG
|
|
bool
|
|
depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
|
|
default y
|
|
|
|
source "drivers/pci/pcie/Kconfig"
|
|
|
|
source "drivers/pci/Kconfig"
|
|
|
|
config ISA_DMA_API
|
|
bool
|
|
default y
|
|
|
|
config ISA
|
|
bool "ISA support"
|
|
depends on !(X86_VOYAGER || X86_VISWS)
|
|
help
|
|
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
|
|
---help---
|
|
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
|
|
help
|
|
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
|
|
help
|
|
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
|
|
help
|
|
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"
|
|
|
|
endmenu
|
|
|
|
menu "Executable file formats"
|
|
|
|
source "fs/Kconfig.binfmt"
|
|
|
|
endmenu
|
|
|
|
source "net/Kconfig"
|
|
|
|
source "drivers/Kconfig"
|
|
|
|
source "fs/Kconfig"
|
|
|
|
menuconfig INSTRUMENTATION
|
|
bool "Instrumentation Support"
|
|
depends on EXPERIMENTAL
|
|
default y
|
|
---help---
|
|
Say Y here to get to see options related to performance measurement,
|
|
debugging, and testing. This option alone does not add any kernel code.
|
|
|
|
If you say N, all options in this submenu will be skipped and disabled.
|
|
|
|
if INSTRUMENTATION
|
|
|
|
source "arch/i386/oprofile/Kconfig"
|
|
|
|
config KPROBES
|
|
bool "Kprobes"
|
|
depends on KALLSYMS && MODULES
|
|
help
|
|
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".
|
|
|
|
endif # INSTRUMENTATION
|
|
|
|
source "arch/i386/Kconfig.debug"
|
|
|
|
source "security/Kconfig"
|
|
|
|
source "crypto/Kconfig"
|
|
|
|
source "lib/Kconfig"
|
|
|
|
#
|
|
# Use the generic interrupt handling code in kernel/irq/:
|
|
#
|
|
config GENERIC_HARDIRQS
|
|
bool
|
|
default y
|
|
|
|
config GENERIC_IRQ_PROBE
|
|
bool
|
|
default y
|
|
|
|
config GENERIC_PENDING_IRQ
|
|
bool
|
|
depends on GENERIC_HARDIRQS && SMP
|
|
default y
|
|
|
|
config X86_SMP
|
|
bool
|
|
depends on SMP && !X86_VOYAGER
|
|
default y
|
|
|
|
config X86_HT
|
|
bool
|
|
depends on SMP && !(X86_VISWS || X86_VOYAGER)
|
|
default y
|
|
|
|
config X86_BIOS_REBOOT
|
|
bool
|
|
depends on !(X86_VISWS || X86_VOYAGER)
|
|
default y
|
|
|
|
config X86_TRAMPOLINE
|
|
bool
|
|
depends on X86_SMP || (X86_VOYAGER && SMP)
|
|
default y
|
|
|
|
config KTIME_SCALAR
|
|
bool
|
|
default y
|