2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
14 select SYS_SUPPORTS_APM_EMULATION
17 select HAVE_KPROBES if (!XIP_KERNEL)
18 select HAVE_KRETPROBES if (HAVE_KPROBES)
19 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
20 select HAVE_GENERIC_DMA_COHERENT
22 The ARM series is a line of low-power-consumption RISC chip designs
23 licensed by ARM Ltd and targeted at embedded applications and
24 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
25 manufactured, but legacy ARM-based PC hardware remains popular in
26 Europe. There is an ARM Linux project with a web page at
27 <http://www.arm.linux.org.uk/>.
32 config SYS_SUPPORTS_APM_EMULATION
41 config GENERIC_CLOCKEVENTS
44 config GENERIC_CLOCKEVENTS_BROADCAST
46 depends on GENERIC_CLOCKEVENTS
47 default y if SMP && !LOCAL_TIMERS
51 select GENERIC_ALLOCATOR
59 The Extended Industry Standard Architecture (EISA) bus was
60 developed as an open alternative to the IBM MicroChannel bus.
62 The EISA bus provided some of the features of the IBM MicroChannel
63 bus while maintaining backward compatibility with cards made for
64 the older ISA bus. The EISA bus saw limited use between 1988 and
65 1995 when it was made obsolete by the PCI bus.
67 Say Y here if you are building a kernel for an EISA-based machine.
77 MicroChannel Architecture is found in some IBM PS/2 machines and
78 laptops. It is a bus system similar to PCI or ISA. See
79 <file:Documentation/mca.txt> (and especially the web page given
80 there) before attempting to build an MCA bus kernel.
82 config GENERIC_HARDIRQS
86 config STACKTRACE_SUPPORT
90 config HAVE_LATENCYTOP_SUPPORT
95 config LOCKDEP_SUPPORT
99 config TRACE_IRQFLAGS_SUPPORT
103 config HARDIRQS_SW_RESEND
107 config GENERIC_IRQ_PROBE
111 config GENERIC_LOCKBREAK
114 depends on SMP && PREEMPT
116 config RWSEM_GENERIC_SPINLOCK
120 config RWSEM_XCHGADD_ALGORITHM
123 config ARCH_HAS_ILOG2_U32
126 config ARCH_HAS_ILOG2_U64
129 config ARCH_HAS_CPUFREQ
132 Internal node to signify that the ARCH has CPUFREQ support
133 and that the relevant menu configurations are displayed for
136 config GENERIC_HWEIGHT
140 config GENERIC_CALIBRATE_DELAY
144 config ARCH_MAY_HAVE_PC_FDC
150 config GENERIC_ISA_DMA
159 config GENERIC_HARDIRQS_NO__DO_IRQ
164 config OPROFILE_ARMV6
166 depends on CPU_V6 && !SMP
167 select OPROFILE_ARM11_CORE
169 config OPROFILE_MPCORE
171 depends on CPU_V6 && SMP
172 select OPROFILE_ARM11_CORE
174 config OPROFILE_ARM11_CORE
177 config OPROFILE_ARMV7
179 depends on CPU_V7 && !SMP
186 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
187 default DRAM_BASE if REMAP_VECTORS_TO_RAM
190 The base address of exception vectors.
192 source "init/Kconfig"
194 source "kernel/Kconfig.freezer"
199 bool "MMU-based Paged Memory Management Support"
202 Select if you want MMU-based virtualised addressing space
203 support by paged memory management. If unsure, say 'Y'.
206 prompt "ARM system type"
207 default ARCH_VERSATILE
210 bool "Agilent AAEC-2000 based"
215 This enables support for systems based on the Agilent AAEC-2000
217 config ARCH_INTEGRATOR
218 bool "ARM Ltd. Integrator family"
220 select ARCH_HAS_CPUFREQ
225 Support for ARM's Integrator platform.
228 bool "ARM Ltd. RealView family"
234 select GENERIC_CLOCKEVENTS
235 select ARCH_WANT_OPTIONAL_GPIOLIB
237 This enables support for ARM Ltd RealView boards.
239 config ARCH_VERSATILE
240 bool "ARM Ltd. Versatile family"
247 select GENERIC_CLOCKEVENTS
248 select ARCH_WANT_OPTIONAL_GPIOLIB
250 This enables support for ARM Ltd Versatile board.
255 select ARCH_REQUIRE_GPIOLIB
258 This enables support for systems based on the Atmel AT91RM9200,
259 AT91SAM9 and AT91CAP9 processors.
262 bool "Cirrus Logic CLPS711x/EP721x-based"
265 Support for Cirrus Logic 711x/721x based boards.
268 bool "Cortina Systems Gemini"
271 select ARCH_REQUIRE_GPIOLIB
273 Support for the Cortina Systems Gemini family SoCs
281 This is an evaluation board for the StrongARM processor available
282 from Digital. It has limited hardware on-board, including an
283 Ethernet interface, two PCMCIA sockets, two serial ports and a
294 select ARCH_REQUIRE_GPIOLIB
295 select ARCH_HAS_HOLES_MEMORYMODEL
297 This enables support for the Cirrus EP93xx series of CPUs.
299 config ARCH_FOOTBRIDGE
304 Support for systems based on the DC21285 companion chip
305 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
308 bool "Freescale MXC/iMX-based"
310 select GENERIC_CLOCKEVENTS
313 select ARCH_REQUIRE_GPIOLIB
316 Support for Freescale MXC/iMX-based family of processors
319 bool "Freescale STMP3xxx"
323 select ARCH_REQUIRE_GPIOLIB
325 select GENERIC_CLOCKEVENTS
327 select USB_ARCH_HAS_EHCI
329 Support for systems based on the Freescale 3xxx CPUs.
332 bool "Hilscher NetX based"
335 select GENERIC_CLOCKEVENTS
338 This enables support for systems based on the Hilscher NetX Soc
341 bool "Hynix HMS720x-based"
345 This enables support for systems based on the Hynix HMS720x
348 bool "STMicroelectronics Nomadik"
355 select GENERIC_CLOCKEVENTS
357 select ARCH_REQUIRE_GPIOLIB
359 Support for the Nomadik platform by ST-Ericsson
367 select ARCH_SUPPORTS_MSI
370 Support for Intel's IOP13XX (XScale) family of processors.
379 select ARCH_REQUIRE_GPIOLIB
381 Support for Intel's 80219 and IOP32X (XScale) family of
391 select ARCH_REQUIRE_GPIOLIB
393 Support for Intel's IOP33X (XScale) family of processors.
401 Support for Intel's IXP23xx (XScale) family of processors.
404 bool "IXP2400/2800-based"
409 Support for Intel's IXP2400/2800 (XScale) family of processors.
417 select GENERIC_CLOCKEVENTS
418 select DMABOUNCE if PCI
420 Support for Intel's IXP4XX (XScale) family of processors.
427 Say Y here if you intend to run this kernel on a LinkUp Systems
428 L7200 Software Development Board which uses an ARM720T processor.
429 Information on this board can be obtained at:
431 <http://www.linkupsys.com/>
433 If you have any questions or comments about the Linux kernel port
434 to this board, send e-mail to <sjhill@cotw.com>.
437 bool "Marvell Kirkwood"
441 select ARCH_REQUIRE_GPIOLIB
443 select GENERIC_CLOCKEVENTS
446 Support for the following Marvell Kirkwood series SoCs:
447 88F6180, 88F6192 and 88F6281.
450 bool "Marvell Loki (88RC8480)"
453 select GENERIC_CLOCKEVENTS
456 Support for the Marvell Loki (88RC8480) SoC.
459 bool "Marvell MV78xx0"
463 select ARCH_REQUIRE_GPIOLIB
465 select GENERIC_CLOCKEVENTS
468 Support for the following Marvell MV78xx0 series SoCs:
477 select ARCH_REQUIRE_GPIOLIB
479 select GENERIC_CLOCKEVENTS
482 Support for the following Marvell Orion 5x series SoCs:
483 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
484 Orion-2 (5281), Orion-1-90 (6183).
487 bool "Marvell PXA168/910"
490 select ARCH_REQUIRE_GPIOLIB
494 select GENERIC_CLOCKEVENTS
498 Support for Marvell's PXA168/910 processor line.
501 bool "Micrel/Kendin KS8695"
504 select ARCH_REQUIRE_GPIOLIB
506 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
507 System-on-Chip devices.
510 bool "NetSilicon NS9xxx"
514 select GENERIC_CLOCKEVENTS
517 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
520 <http://www.digi.com/products/microprocessors/index.jsp>
523 bool "Nuvoton W90X900 CPU"
525 select ARCH_REQUIRE_GPIOLIB
530 select GENERIC_CLOCKEVENTS
532 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
533 At present, the w90x900 has been renamed nuc900, regarding
534 the ARM series product line, you can login the following
535 link address to know more.
537 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
538 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
541 bool "Philips Nexperia PNX4008 Mobile"
545 This enables support for Philips PNX4008 mobile platform.
548 bool "PXA2xx/PXA3xx-based"
551 select ARCH_HAS_CPUFREQ
555 select ARCH_REQUIRE_GPIOLIB
557 select GENERIC_CLOCKEVENTS
561 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
567 select GENERIC_CLOCKEVENTS
569 Support for Qualcomm MSM7K based systems. This runs on the ARM11
570 apps processor of the MSM7K and depends on a shared memory
571 interface to the ARM9 modem processor which runs the baseband stack
572 and controls some vital subsystems (clock and power control, etc).
579 select ARCH_MAY_HAVE_PC_FDC
580 select HAVE_PATA_PLATFORM
583 select ARCH_SPARSEMEM_ENABLE
585 On the Acorn Risc-PC, Linux can support the internal IDE disk and
586 CD-ROM interface, serial and parallel port, and the floppy drive.
592 select ARCH_SPARSEMEM_ENABLE
594 select ARCH_HAS_CPUFREQ
597 select GENERIC_CLOCKEVENTS
600 select ARCH_REQUIRE_GPIOLIB
602 Support for StrongARM 11x0 based boards.
605 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
607 select ARCH_HAS_CPUFREQ
610 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
611 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
612 the Samsung SMDK2410 development board (and derivatives).
615 bool "Samsung S3C64XX"
618 select ARCH_HAS_CPUFREQ
620 Samsung S3C64XX series based systems
623 bool "Samsung S5PC1XX"
628 Samsung S5PC1XX series based systems
638 Support for the StrongARM based Digital DNARD machine, also known
639 as "Shark" (<http://www.shark-linux.de/shark.html>).
644 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
645 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
647 Say Y here for systems based on one of the Sharp LH7A40X
648 System on a Chip processors. These CPUs include an ARM922T
649 core with a wide array of integrated devices for
650 hand-held and low-power applications.
653 bool "ST-Ericsson U300 Series"
660 select GENERIC_CLOCKEVENTS
665 Support for ST-Ericsson U300 series mobile platforms.
671 select GENERIC_CLOCKEVENTS
673 select ARCH_REQUIRE_GPIOLIB
678 select GENERIC_ALLOCATOR
680 Support for TI's DaVinci platform.
686 select ARCH_REQUIRE_GPIOLIB
687 select ARCH_HAS_CPUFREQ
689 select GENERIC_CLOCKEVENTS
691 Support for TI's OMAP platform (OMAP1 and OMAP2).
694 bool "Broadcom BCMRING"
700 select GENERIC_CLOCKEVENTS
701 select ARCH_WANT_OPTIONAL_GPIOLIB
703 Support for Broadcom's BCMRing platform.
707 source "arch/arm/mach-clps711x/Kconfig"
709 source "arch/arm/mach-ep93xx/Kconfig"
711 source "arch/arm/mach-footbridge/Kconfig"
713 source "arch/arm/mach-gemini/Kconfig"
715 source "arch/arm/mach-integrator/Kconfig"
717 source "arch/arm/mach-iop32x/Kconfig"
719 source "arch/arm/mach-iop33x/Kconfig"
721 source "arch/arm/mach-iop13xx/Kconfig"
723 source "arch/arm/mach-ixp4xx/Kconfig"
725 source "arch/arm/mach-ixp2000/Kconfig"
727 source "arch/arm/mach-ixp23xx/Kconfig"
729 source "arch/arm/mach-loki/Kconfig"
731 source "arch/arm/mach-mv78xx0/Kconfig"
733 source "arch/arm/mach-pxa/Kconfig"
734 source "arch/arm/plat-pxa/Kconfig"
736 source "arch/arm/mach-mmp/Kconfig"
738 source "arch/arm/mach-sa1100/Kconfig"
740 source "arch/arm/plat-omap/Kconfig"
742 source "arch/arm/mach-omap1/Kconfig"
744 source "arch/arm/mach-omap2/Kconfig"
746 source "arch/arm/mach-orion5x/Kconfig"
748 source "arch/arm/mach-kirkwood/Kconfig"
750 source "arch/arm/plat-s3c24xx/Kconfig"
751 source "arch/arm/plat-s3c64xx/Kconfig"
752 source "arch/arm/plat-s3c/Kconfig"
753 source "arch/arm/plat-s5pc1xx/Kconfig"
756 source "arch/arm/mach-s3c2400/Kconfig"
757 source "arch/arm/mach-s3c2410/Kconfig"
758 source "arch/arm/mach-s3c2412/Kconfig"
759 source "arch/arm/mach-s3c2440/Kconfig"
760 source "arch/arm/mach-s3c2442/Kconfig"
761 source "arch/arm/mach-s3c2443/Kconfig"
765 source "arch/arm/mach-s3c6400/Kconfig"
766 source "arch/arm/mach-s3c6410/Kconfig"
769 source "arch/arm/plat-stmp3xxx/Kconfig"
772 source "arch/arm/mach-s5pc100/Kconfig"
775 source "arch/arm/mach-lh7a40x/Kconfig"
777 source "arch/arm/mach-h720x/Kconfig"
779 source "arch/arm/mach-versatile/Kconfig"
781 source "arch/arm/mach-aaec2000/Kconfig"
783 source "arch/arm/mach-realview/Kconfig"
785 source "arch/arm/mach-at91/Kconfig"
787 source "arch/arm/plat-mxc/Kconfig"
789 source "arch/arm/mach-nomadik/Kconfig"
791 source "arch/arm/mach-netx/Kconfig"
793 source "arch/arm/mach-ns9xxx/Kconfig"
795 source "arch/arm/mach-davinci/Kconfig"
797 source "arch/arm/mach-ks8695/Kconfig"
799 source "arch/arm/mach-msm/Kconfig"
801 source "arch/arm/mach-u300/Kconfig"
803 source "arch/arm/mach-w90x900/Kconfig"
805 source "arch/arm/mach-bcmring/Kconfig"
807 # Definitions to make life easier
820 source arch/arm/mm/Kconfig
823 bool "Enable iWMMXt support"
824 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
825 default y if PXA27x || PXA3xx || ARCH_MMP
827 Enable support for iWMMXt context switching at run time if
828 running on a CPU that supports it.
830 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
833 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
837 source "arch/arm/Kconfig-nommu"
840 config ARM_ERRATA_411920
841 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
842 depends on CPU_V6 && !SMP
844 Invalidation of the Instruction Cache operation can
845 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
846 It does not affect the MPCore. This option enables the ARM Ltd.
847 recommended workaround.
849 config ARM_ERRATA_430973
850 bool "ARM errata: Stale prediction on replaced interworking branch"
853 This option enables the workaround for the 430973 Cortex-A8
854 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
855 interworking branch is replaced with another code sequence at the
856 same virtual address, whether due to self-modifying code or virtual
857 to physical address re-mapping, Cortex-A8 does not recover from the
858 stale interworking branch prediction. This results in Cortex-A8
859 executing the new code sequence in the incorrect ARM or Thumb state.
860 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
861 and also flushes the branch target cache at every context switch.
862 Note that setting specific bits in the ACTLR register may not be
863 available in non-secure mode.
865 config ARM_ERRATA_458693
866 bool "ARM errata: Processor deadlock when a false hazard is created"
869 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
870 erratum. For very specific sequences of memory operations, it is
871 possible for a hazard condition intended for a cache line to instead
872 be incorrectly associated with a different cache line. This false
873 hazard might then cause a processor deadlock. The workaround enables
874 the L1 caching of the NEON accesses and disables the PLD instruction
875 in the ACTLR register. Note that setting specific bits in the ACTLR
876 register may not be available in non-secure mode.
878 config ARM_ERRATA_460075
879 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
882 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
883 erratum. Any asynchronous access to the L2 cache may encounter a
884 situation in which recent store transactions to the L2 cache are lost
885 and overwritten with stale memory contents from external memory. The
886 workaround disables the write-allocate mode for the L2 cache via the
887 ACTLR register. Note that setting specific bits in the ACTLR register
888 may not be available in non-secure mode.
892 source "arch/arm/common/Kconfig"
894 config FORCE_MAX_ZONEORDER
907 Find out whether you have ISA slots on your motherboard. ISA is the
908 name of a bus system, i.e. the way the CPU talks to the other stuff
909 inside your box. Other bus systems are PCI, EISA, MicroChannel
910 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
911 newer boards don't support it. If you have ISA, say Y, otherwise N.
913 # Select ISA DMA controller support
918 # Select ISA DMA interface
923 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
925 Find out whether you have a PCI motherboard. PCI is the name of a
926 bus system, i.e. the way the CPU talks to the other stuff inside
927 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
928 VESA. If you have PCI, say Y, otherwise N.
933 # Select the host bridge type
934 config PCI_HOST_VIA82C505
936 depends on PCI && ARCH_SHARK
939 config PCI_HOST_ITE8152
941 depends on PCI && MACH_ARMCORE
945 source "drivers/pci/Kconfig"
947 source "drivers/pcmcia/Kconfig"
951 menu "Kernel Features"
953 source "kernel/time/Kconfig"
956 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
957 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
958 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
959 depends on GENERIC_CLOCKEVENTS
960 select USE_GENERIC_SMP_HELPERS
961 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
963 This enables support for systems with more than one CPU. If you have
964 a system with only one CPU, like most personal computers, say N. If
965 you have a system with more than one CPU, say Y.
967 If you say N here, the kernel will run on single and multiprocessor
968 machines, but will use only one CPU of a multiprocessor machine. If
969 you say Y here, the kernel will run on many, but not all, single
970 processor machines. On a single processor machine, the kernel will
971 run faster if you say N here.
973 See also <file:Documentation/i386/IO-APIC.txt>,
974 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
975 <http://www.linuxdoc.org/docs.html#howto>.
977 If you don't know what to do here, say N.
983 This option enables support for the ARM system coherency unit
989 This options enables support for the ARM timer and watchdog unit
992 prompt "Memory split"
995 Select the desired split between kernel and user memory.
997 If you are not absolutely sure what you are doing, leave this
1001 bool "3G/1G user/kernel split"
1003 bool "2G/2G user/kernel split"
1005 bool "1G/3G user/kernel split"
1010 default 0x40000000 if VMSPLIT_1G
1011 default 0x80000000 if VMSPLIT_2G
1015 int "Maximum number of CPUs (2-32)"
1021 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1022 depends on SMP && HOTPLUG && EXPERIMENTAL
1024 Say Y here to experiment with turning CPUs off and on. CPUs
1025 can be controlled through /sys/devices/system/cpu.
1028 bool "Use local timer interrupts"
1029 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1030 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1032 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
1034 Enable support for local timers on SMP platforms, rather then the
1035 legacy IPI broadcast method. Local timers allows the system
1036 accounting to be spread across the timer interval, preventing a
1037 "thundering herd" at every timer tick.
1039 source kernel/Kconfig.preempt
1043 default 128 if ARCH_L7200
1044 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1045 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1046 default AT91_TIMER_HZ if ARCH_AT91
1049 config THUMB2_KERNEL
1050 bool "Compile the kernel in Thumb-2 mode"
1051 depends on CPU_V7 && EXPERIMENTAL
1053 select ARM_ASM_UNIFIED
1055 By enabling this option, the kernel will be compiled in
1056 Thumb-2 mode. A compiler/assembler that understand the unified
1057 ARM-Thumb syntax is needed.
1061 config ARM_ASM_UNIFIED
1065 bool "Use the ARM EABI to compile the kernel"
1067 This option allows for the kernel to be compiled using the latest
1068 ARM ABI (aka EABI). This is only useful if you are using a user
1069 space environment that is also compiled with EABI.
1071 Since there are major incompatibilities between the legacy ABI and
1072 EABI, especially with regard to structure member alignment, this
1073 option also changes the kernel syscall calling convention to
1074 disambiguate both ABIs and allow for backward compatibility support
1075 (selected with CONFIG_OABI_COMPAT).
1077 To use this you need GCC version 4.0.0 or later.
1080 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1081 depends on AEABI && EXPERIMENTAL
1084 This option preserves the old syscall interface along with the
1085 new (ARM EABI) one. It also provides a compatibility layer to
1086 intercept syscalls that have structure arguments which layout
1087 in memory differs between the legacy ABI and the new ARM EABI
1088 (only for non "thumb" binaries). This option adds a tiny
1089 overhead to all syscalls and produces a slightly larger kernel.
1090 If you know you'll be using only pure EABI user space then you
1091 can say N here. If this option is not selected and you attempt
1092 to execute a legacy ABI binary then the result will be
1093 UNPREDICTABLE (in fact it can be predicted that it won't work
1094 at all). If in doubt say Y.
1096 config ARCH_HAS_HOLES_MEMORYMODEL
1099 # Discontigmem is deprecated
1100 config ARCH_DISCONTIGMEM_ENABLE
1103 config ARCH_SPARSEMEM_ENABLE
1106 config ARCH_SPARSEMEM_DEFAULT
1107 def_bool ARCH_SPARSEMEM_ENABLE
1109 config ARCH_SELECT_MEMORY_MODEL
1110 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1114 default "4" if ARCH_LH7A40X
1116 depends on NEED_MULTIPLE_NODES
1119 bool "High Memory Support (EXPERIMENTAL)"
1120 depends on MMU && EXPERIMENTAL
1122 The address space of ARM processors is only 4 Gigabytes large
1123 and it has to accommodate user address space, kernel address
1124 space as well as some memory mapped IO. That means that, if you
1125 have a large amount of physical memory and/or IO, not all of the
1126 memory can be "permanently mapped" by the kernel. The physical
1127 memory that is not permanently mapped is called "high memory".
1129 Depending on the selected kernel/user memory split, minimum
1130 vmalloc space and actual amount of RAM, you may not need this
1131 option which should result in a slightly faster kernel.
1136 bool "Allocate 2nd-level pagetables from highmem"
1138 depends on !OUTER_CACHE
1143 bool "Timer and CPU usage LEDs"
1144 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1145 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1146 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1147 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1148 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1149 ARCH_AT91 || ARCH_DAVINCI || \
1150 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1152 If you say Y here, the LEDs on your machine will be used
1153 to provide useful information about your current system status.
1155 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1156 be able to select which LEDs are active using the options below. If
1157 you are compiling a kernel for the EBSA-110 or the LART however, the
1158 red LED will simply flash regularly to indicate that the system is
1159 still functional. It is safe to say Y here if you have a CATS
1160 system, but the driver will do nothing.
1163 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1164 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1165 || MACH_OMAP_PERSEUS2
1167 depends on !GENERIC_CLOCKEVENTS
1168 default y if ARCH_EBSA110
1170 If you say Y here, one of the system LEDs (the green one on the
1171 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1172 will flash regularly to indicate that the system is still
1173 operational. This is mainly useful to kernel hackers who are
1174 debugging unstable kernels.
1176 The LART uses the same LED for both Timer LED and CPU usage LED
1177 functions. You may choose to use both, but the Timer LED function
1178 will overrule the CPU usage LED.
1181 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1183 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1184 || MACH_OMAP_PERSEUS2
1187 If you say Y here, the red LED will be used to give a good real
1188 time indication of CPU usage, by lighting whenever the idle task
1189 is not currently executing.
1191 The LART uses the same LED for both Timer LED and CPU usage LED
1192 functions. You may choose to use both, but the Timer LED function
1193 will overrule the CPU usage LED.
1195 config ALIGNMENT_TRAP
1197 depends on CPU_CP15_MMU
1198 default y if !ARCH_EBSA110
1200 ARM processors cannot fetch/store information which is not
1201 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1202 address divisible by 4. On 32-bit ARM processors, these non-aligned
1203 fetch/store instructions will be emulated in software if you say
1204 here, which has a severe performance impact. This is necessary for
1205 correct operation of some network protocols. With an IP-only
1206 configuration it is safe to say N, otherwise say Y.
1208 config UACCESS_WITH_MEMCPY
1209 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1210 depends on MMU && EXPERIMENTAL
1211 default y if CPU_FEROCEON
1213 Implement faster copy_to_user and clear_user methods for CPU
1214 cores where a 8-word STM instruction give significantly higher
1215 memory write throughput than a sequence of individual 32bit stores.
1217 A possible side effect is a slight increase in scheduling latency
1218 between threads sharing the same address space if they invoke
1219 such copy operations with large buffers.
1221 However, if the CPU data cache is using a write-allocate mode,
1222 this option is unlikely to provide any performance gain.
1228 # Compressed boot loader in ROM. Yes, we really want to ask about
1229 # TEXT and BSS so we preserve their values in the config files.
1230 config ZBOOT_ROM_TEXT
1231 hex "Compressed ROM boot loader base address"
1234 The physical address at which the ROM-able zImage is to be
1235 placed in the target. Platforms which normally make use of
1236 ROM-able zImage formats normally set this to a suitable
1237 value in their defconfig file.
1239 If ZBOOT_ROM is not enabled, this has no effect.
1241 config ZBOOT_ROM_BSS
1242 hex "Compressed ROM boot loader BSS address"
1245 The base address of an area of read/write memory in the target
1246 for the ROM-able zImage which must be available while the
1247 decompressor is running. It must be large enough to hold the
1248 entire decompressed kernel plus an additional 128 KiB.
1249 Platforms which normally make use of ROM-able zImage formats
1250 normally set this to a suitable value in their defconfig file.
1252 If ZBOOT_ROM is not enabled, this has no effect.
1255 bool "Compressed boot loader in ROM/flash"
1256 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1258 Say Y here if you intend to execute your compressed kernel image
1259 (zImage) directly from ROM or flash. If unsure, say N.
1262 string "Default kernel command string"
1265 On some architectures (EBSA110 and CATS), there is currently no way
1266 for the boot loader to pass arguments to the kernel. For these
1267 architectures, you should supply some command-line options at build
1268 time by entering them here. As a minimum, you should specify the
1269 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1272 bool "Kernel Execute-In-Place from ROM"
1273 depends on !ZBOOT_ROM
1275 Execute-In-Place allows the kernel to run from non-volatile storage
1276 directly addressable by the CPU, such as NOR flash. This saves RAM
1277 space since the text section of the kernel is not loaded from flash
1278 to RAM. Read-write sections, such as the data section and stack,
1279 are still copied to RAM. The XIP kernel is not compressed since
1280 it has to run directly from flash, so it will take more space to
1281 store it. The flash address used to link the kernel object files,
1282 and for storing it, is configuration dependent. Therefore, if you
1283 say Y here, you must know the proper physical address where to
1284 store the kernel image depending on your own flash memory usage.
1286 Also note that the make target becomes "make xipImage" rather than
1287 "make zImage" or "make Image". The final kernel binary to put in
1288 ROM memory will be arch/arm/boot/xipImage.
1292 config XIP_PHYS_ADDR
1293 hex "XIP Kernel Physical Location"
1294 depends on XIP_KERNEL
1295 default "0x00080000"
1297 This is the physical address in your flash memory the kernel will
1298 be linked for and stored to. This address is dependent on your
1302 bool "Kexec system call (EXPERIMENTAL)"
1303 depends on EXPERIMENTAL
1305 kexec is a system call that implements the ability to shutdown your
1306 current kernel, and to start another kernel. It is like a reboot
1307 but it is independent of the system firmware. And like a reboot
1308 you can start any kernel with it, not just Linux.
1310 It is an ongoing process to be certain the hardware in a machine
1311 is properly shutdown, so do not be surprised if this code does not
1312 initially work for you. It may help to enable device hotplugging
1316 bool "Export atags in procfs"
1320 Should the atags used to boot the kernel be exported in an "atags"
1321 file in procfs. Useful with kexec.
1325 menu "CPU Power Management"
1329 source "drivers/cpufreq/Kconfig"
1331 config CPU_FREQ_SA1100
1333 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1336 config CPU_FREQ_SA1110
1338 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1341 config CPU_FREQ_INTEGRATOR
1342 tristate "CPUfreq driver for ARM Integrator CPUs"
1343 depends on ARCH_INTEGRATOR && CPU_FREQ
1346 This enables the CPUfreq driver for ARM Integrator CPUs.
1348 For details, take a look at <file:Documentation/cpu-freq>.
1354 depends on CPU_FREQ && ARCH_PXA && PXA25x
1356 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1358 config CPU_FREQ_S3C64XX
1359 bool "CPUfreq support for Samsung S3C64XX CPUs"
1360 depends on CPU_FREQ && CPU_S3C6410
1365 Internal configuration node for common cpufreq on Samsung SoC
1367 config CPU_FREQ_S3C24XX
1368 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1369 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1372 This enables the CPUfreq driver for the Samsung S3C24XX family
1375 For details, take a look at <file:Documentation/cpu-freq>.
1379 config CPU_FREQ_S3C24XX_PLL
1380 bool "Support CPUfreq changing of PLL frequency"
1381 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1383 Compile in support for changing the PLL frequency from the
1384 S3C24XX series CPUfreq driver. The PLL takes time to settle
1385 after a frequency change, so by default it is not enabled.
1387 This also means that the PLL tables for the selected CPU(s) will
1388 be built which may increase the size of the kernel image.
1390 config CPU_FREQ_S3C24XX_DEBUG
1391 bool "Debug CPUfreq Samsung driver core"
1392 depends on CPU_FREQ_S3C24XX
1394 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1396 config CPU_FREQ_S3C24XX_IODEBUG
1397 bool "Debug CPUfreq Samsung driver IO timing"
1398 depends on CPU_FREQ_S3C24XX
1400 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1402 config CPU_FREQ_S3C24XX_DEBUGFS
1403 bool "Export debugfs for CPUFreq"
1404 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1406 Export status information via debugfs.
1410 source "drivers/cpuidle/Kconfig"
1414 menu "Floating point emulation"
1416 comment "At least one emulation must be selected"
1419 bool "NWFPE math emulation"
1420 depends on !AEABI || OABI_COMPAT
1422 Say Y to include the NWFPE floating point emulator in the kernel.
1423 This is necessary to run most binaries. Linux does not currently
1424 support floating point hardware so you need to say Y here even if
1425 your machine has an FPA or floating point co-processor podule.
1427 You may say N here if you are going to load the Acorn FPEmulator
1428 early in the bootup.
1431 bool "Support extended precision"
1432 depends on FPE_NWFPE
1434 Say Y to include 80-bit support in the kernel floating-point
1435 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1436 Note that gcc does not generate 80-bit operations by default,
1437 so in most cases this option only enlarges the size of the
1438 floating point emulator without any good reason.
1440 You almost surely want to say N here.
1443 bool "FastFPE math emulation (EXPERIMENTAL)"
1444 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1446 Say Y here to include the FAST floating point emulator in the kernel.
1447 This is an experimental much faster emulator which now also has full
1448 precision for the mantissa. It does not support any exceptions.
1449 It is very simple, and approximately 3-6 times faster than NWFPE.
1451 It should be sufficient for most programs. It may be not suitable
1452 for scientific calculations, but you have to check this for yourself.
1453 If you do not feel you need a faster FP emulation you should better
1457 bool "VFP-format floating point maths"
1458 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1460 Say Y to include VFP support code in the kernel. This is needed
1461 if your hardware includes a VFP unit.
1463 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1464 release notes and additional status information.
1466 Say N if your target does not have VFP hardware.
1474 bool "Advanced SIMD (NEON) Extension support"
1475 depends on VFPv3 && CPU_V7
1477 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1482 menu "Userspace binary formats"
1484 source "fs/Kconfig.binfmt"
1487 tristate "RISC OS personality"
1490 Say Y here to include the kernel code necessary if you want to run
1491 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1492 experimental; if this sounds frightening, say N and sleep in peace.
1493 You can also say M here to compile this support as a module (which
1494 will be called arthur).
1498 menu "Power management options"
1500 source "kernel/power/Kconfig"
1502 config ARCH_SUSPEND_POSSIBLE
1507 source "net/Kconfig"
1509 source "drivers/Kconfig"
1513 source "arch/arm/Kconfig.debug"
1515 source "security/Kconfig"
1517 source "crypto/Kconfig"
1519 source "lib/Kconfig"