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.
890 config ARM_ERRATA_720789
891 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
892 depends on CPU_V7 && SMP
894 This option enables the workaround for the 720789 Cortex-A9 (prior to
895 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
896 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
897 As a consequence of this erratum, some TLB entries which should be
898 invalidated are not, resulting in an incoherency in the system page
899 tables. The workaround changes the TLB flushing routines to invalidate
900 entries regardless of the ASID.
904 source "arch/arm/common/Kconfig"
906 config FORCE_MAX_ZONEORDER
919 Find out whether you have ISA slots on your motherboard. ISA is the
920 name of a bus system, i.e. the way the CPU talks to the other stuff
921 inside your box. Other bus systems are PCI, EISA, MicroChannel
922 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
923 newer boards don't support it. If you have ISA, say Y, otherwise N.
925 # Select ISA DMA controller support
930 # Select ISA DMA interface
935 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
937 Find out whether you have a PCI motherboard. PCI is the name of a
938 bus system, i.e. the way the CPU talks to the other stuff inside
939 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
940 VESA. If you have PCI, say Y, otherwise N.
945 # Select the host bridge type
946 config PCI_HOST_VIA82C505
948 depends on PCI && ARCH_SHARK
951 config PCI_HOST_ITE8152
953 depends on PCI && MACH_ARMCORE
957 source "drivers/pci/Kconfig"
959 source "drivers/pcmcia/Kconfig"
963 menu "Kernel Features"
965 source "kernel/time/Kconfig"
968 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
969 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
970 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
971 depends on GENERIC_CLOCKEVENTS
972 select USE_GENERIC_SMP_HELPERS
973 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
975 This enables support for systems with more than one CPU. If you have
976 a system with only one CPU, like most personal computers, say N. If
977 you have a system with more than one CPU, say Y.
979 If you say N here, the kernel will run on single and multiprocessor
980 machines, but will use only one CPU of a multiprocessor machine. If
981 you say Y here, the kernel will run on many, but not all, single
982 processor machines. On a single processor machine, the kernel will
983 run faster if you say N here.
985 See also <file:Documentation/i386/IO-APIC.txt>,
986 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
987 <http://www.linuxdoc.org/docs.html#howto>.
989 If you don't know what to do here, say N.
995 This option enables support for the ARM system coherency unit
1001 This options enables support for the ARM timer and watchdog unit
1004 prompt "Memory split"
1007 Select the desired split between kernel and user memory.
1009 If you are not absolutely sure what you are doing, leave this
1013 bool "3G/1G user/kernel split"
1015 bool "2G/2G user/kernel split"
1017 bool "1G/3G user/kernel split"
1022 default 0x40000000 if VMSPLIT_1G
1023 default 0x80000000 if VMSPLIT_2G
1027 int "Maximum number of CPUs (2-32)"
1033 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1034 depends on SMP && HOTPLUG && EXPERIMENTAL
1036 Say Y here to experiment with turning CPUs off and on. CPUs
1037 can be controlled through /sys/devices/system/cpu.
1040 bool "Use local timer interrupts"
1041 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1042 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1044 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
1046 Enable support for local timers on SMP platforms, rather then the
1047 legacy IPI broadcast method. Local timers allows the system
1048 accounting to be spread across the timer interval, preventing a
1049 "thundering herd" at every timer tick.
1051 source kernel/Kconfig.preempt
1055 default 128 if ARCH_L7200
1056 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1057 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1058 default AT91_TIMER_HZ if ARCH_AT91
1061 config THUMB2_KERNEL
1062 bool "Compile the kernel in Thumb-2 mode"
1063 depends on CPU_V7 && EXPERIMENTAL
1065 select ARM_ASM_UNIFIED
1067 By enabling this option, the kernel will be compiled in
1068 Thumb-2 mode. A compiler/assembler that understand the unified
1069 ARM-Thumb syntax is needed.
1073 config ARM_ASM_UNIFIED
1077 bool "Use the ARM EABI to compile the kernel"
1079 This option allows for the kernel to be compiled using the latest
1080 ARM ABI (aka EABI). This is only useful if you are using a user
1081 space environment that is also compiled with EABI.
1083 Since there are major incompatibilities between the legacy ABI and
1084 EABI, especially with regard to structure member alignment, this
1085 option also changes the kernel syscall calling convention to
1086 disambiguate both ABIs and allow for backward compatibility support
1087 (selected with CONFIG_OABI_COMPAT).
1089 To use this you need GCC version 4.0.0 or later.
1092 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1093 depends on AEABI && EXPERIMENTAL
1096 This option preserves the old syscall interface along with the
1097 new (ARM EABI) one. It also provides a compatibility layer to
1098 intercept syscalls that have structure arguments which layout
1099 in memory differs between the legacy ABI and the new ARM EABI
1100 (only for non "thumb" binaries). This option adds a tiny
1101 overhead to all syscalls and produces a slightly larger kernel.
1102 If you know you'll be using only pure EABI user space then you
1103 can say N here. If this option is not selected and you attempt
1104 to execute a legacy ABI binary then the result will be
1105 UNPREDICTABLE (in fact it can be predicted that it won't work
1106 at all). If in doubt say Y.
1108 config ARCH_HAS_HOLES_MEMORYMODEL
1111 # Discontigmem is deprecated
1112 config ARCH_DISCONTIGMEM_ENABLE
1115 config ARCH_SPARSEMEM_ENABLE
1118 config ARCH_SPARSEMEM_DEFAULT
1119 def_bool ARCH_SPARSEMEM_ENABLE
1121 config ARCH_SELECT_MEMORY_MODEL
1122 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1126 default "4" if ARCH_LH7A40X
1128 depends on NEED_MULTIPLE_NODES
1131 bool "High Memory Support (EXPERIMENTAL)"
1132 depends on MMU && EXPERIMENTAL
1134 The address space of ARM processors is only 4 Gigabytes large
1135 and it has to accommodate user address space, kernel address
1136 space as well as some memory mapped IO. That means that, if you
1137 have a large amount of physical memory and/or IO, not all of the
1138 memory can be "permanently mapped" by the kernel. The physical
1139 memory that is not permanently mapped is called "high memory".
1141 Depending on the selected kernel/user memory split, minimum
1142 vmalloc space and actual amount of RAM, you may not need this
1143 option which should result in a slightly faster kernel.
1148 bool "Allocate 2nd-level pagetables from highmem"
1150 depends on !OUTER_CACHE
1155 bool "Timer and CPU usage LEDs"
1156 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1157 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1158 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1159 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1160 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1161 ARCH_AT91 || ARCH_DAVINCI || \
1162 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1164 If you say Y here, the LEDs on your machine will be used
1165 to provide useful information about your current system status.
1167 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1168 be able to select which LEDs are active using the options below. If
1169 you are compiling a kernel for the EBSA-110 or the LART however, the
1170 red LED will simply flash regularly to indicate that the system is
1171 still functional. It is safe to say Y here if you have a CATS
1172 system, but the driver will do nothing.
1175 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1176 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1177 || MACH_OMAP_PERSEUS2
1179 depends on !GENERIC_CLOCKEVENTS
1180 default y if ARCH_EBSA110
1182 If you say Y here, one of the system LEDs (the green one on the
1183 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1184 will flash regularly to indicate that the system is still
1185 operational. This is mainly useful to kernel hackers who are
1186 debugging unstable kernels.
1188 The LART uses the same LED for both Timer LED and CPU usage LED
1189 functions. You may choose to use both, but the Timer LED function
1190 will overrule the CPU usage LED.
1193 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1195 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1196 || MACH_OMAP_PERSEUS2
1199 If you say Y here, the red LED will be used to give a good real
1200 time indication of CPU usage, by lighting whenever the idle task
1201 is not currently executing.
1203 The LART uses the same LED for both Timer LED and CPU usage LED
1204 functions. You may choose to use both, but the Timer LED function
1205 will overrule the CPU usage LED.
1207 config ALIGNMENT_TRAP
1209 depends on CPU_CP15_MMU
1210 default y if !ARCH_EBSA110
1212 ARM processors cannot fetch/store information which is not
1213 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1214 address divisible by 4. On 32-bit ARM processors, these non-aligned
1215 fetch/store instructions will be emulated in software if you say
1216 here, which has a severe performance impact. This is necessary for
1217 correct operation of some network protocols. With an IP-only
1218 configuration it is safe to say N, otherwise say Y.
1220 config UACCESS_WITH_MEMCPY
1221 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1222 depends on MMU && EXPERIMENTAL
1223 default y if CPU_FEROCEON
1225 Implement faster copy_to_user and clear_user methods for CPU
1226 cores where a 8-word STM instruction give significantly higher
1227 memory write throughput than a sequence of individual 32bit stores.
1229 A possible side effect is a slight increase in scheduling latency
1230 between threads sharing the same address space if they invoke
1231 such copy operations with large buffers.
1233 However, if the CPU data cache is using a write-allocate mode,
1234 this option is unlikely to provide any performance gain.
1240 # Compressed boot loader in ROM. Yes, we really want to ask about
1241 # TEXT and BSS so we preserve their values in the config files.
1242 config ZBOOT_ROM_TEXT
1243 hex "Compressed ROM boot loader base address"
1246 The physical address at which the ROM-able zImage is to be
1247 placed in the target. Platforms which normally make use of
1248 ROM-able zImage formats normally set this to a suitable
1249 value in their defconfig file.
1251 If ZBOOT_ROM is not enabled, this has no effect.
1253 config ZBOOT_ROM_BSS
1254 hex "Compressed ROM boot loader BSS address"
1257 The base address of an area of read/write memory in the target
1258 for the ROM-able zImage which must be available while the
1259 decompressor is running. It must be large enough to hold the
1260 entire decompressed kernel plus an additional 128 KiB.
1261 Platforms which normally make use of ROM-able zImage formats
1262 normally set this to a suitable value in their defconfig file.
1264 If ZBOOT_ROM is not enabled, this has no effect.
1267 bool "Compressed boot loader in ROM/flash"
1268 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1270 Say Y here if you intend to execute your compressed kernel image
1271 (zImage) directly from ROM or flash. If unsure, say N.
1274 string "Default kernel command string"
1277 On some architectures (EBSA110 and CATS), there is currently no way
1278 for the boot loader to pass arguments to the kernel. For these
1279 architectures, you should supply some command-line options at build
1280 time by entering them here. As a minimum, you should specify the
1281 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1284 bool "Kernel Execute-In-Place from ROM"
1285 depends on !ZBOOT_ROM
1287 Execute-In-Place allows the kernel to run from non-volatile storage
1288 directly addressable by the CPU, such as NOR flash. This saves RAM
1289 space since the text section of the kernel is not loaded from flash
1290 to RAM. Read-write sections, such as the data section and stack,
1291 are still copied to RAM. The XIP kernel is not compressed since
1292 it has to run directly from flash, so it will take more space to
1293 store it. The flash address used to link the kernel object files,
1294 and for storing it, is configuration dependent. Therefore, if you
1295 say Y here, you must know the proper physical address where to
1296 store the kernel image depending on your own flash memory usage.
1298 Also note that the make target becomes "make xipImage" rather than
1299 "make zImage" or "make Image". The final kernel binary to put in
1300 ROM memory will be arch/arm/boot/xipImage.
1304 config XIP_PHYS_ADDR
1305 hex "XIP Kernel Physical Location"
1306 depends on XIP_KERNEL
1307 default "0x00080000"
1309 This is the physical address in your flash memory the kernel will
1310 be linked for and stored to. This address is dependent on your
1314 bool "Kexec system call (EXPERIMENTAL)"
1315 depends on EXPERIMENTAL
1317 kexec is a system call that implements the ability to shutdown your
1318 current kernel, and to start another kernel. It is like a reboot
1319 but it is independent of the system firmware. And like a reboot
1320 you can start any kernel with it, not just Linux.
1322 It is an ongoing process to be certain the hardware in a machine
1323 is properly shutdown, so do not be surprised if this code does not
1324 initially work for you. It may help to enable device hotplugging
1328 bool "Export atags in procfs"
1332 Should the atags used to boot the kernel be exported in an "atags"
1333 file in procfs. Useful with kexec.
1335 config PL310_ERRATA_769419
1336 bool "PL310 errata: no automatic Store Buffer drain"
1337 depends on CACHE_L2X0
1339 On revisions of the PL310 prior to r3p2, the Store Buffer does
1340 not automatically drain. This can cause normal, non-cacheable
1341 writes to be retained when the memory system is idle, leading
1342 to suboptimal I/O performance for drivers using coherent DMA.
1343 This option adds a write barrier to the cpu_idle loop so that,
1344 on systems with an outer cache, the store buffer is drained
1349 menu "CPU Power Management"
1353 source "drivers/cpufreq/Kconfig"
1355 config CPU_FREQ_SA1100
1357 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1360 config CPU_FREQ_SA1110
1362 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1365 config CPU_FREQ_INTEGRATOR
1366 tristate "CPUfreq driver for ARM Integrator CPUs"
1367 depends on ARCH_INTEGRATOR && CPU_FREQ
1370 This enables the CPUfreq driver for ARM Integrator CPUs.
1372 For details, take a look at <file:Documentation/cpu-freq>.
1378 depends on CPU_FREQ && ARCH_PXA && PXA25x
1380 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1382 config CPU_FREQ_S3C64XX
1383 bool "CPUfreq support for Samsung S3C64XX CPUs"
1384 depends on CPU_FREQ && CPU_S3C6410
1389 Internal configuration node for common cpufreq on Samsung SoC
1391 config CPU_FREQ_S3C24XX
1392 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1393 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1396 This enables the CPUfreq driver for the Samsung S3C24XX family
1399 For details, take a look at <file:Documentation/cpu-freq>.
1403 config CPU_FREQ_S3C24XX_PLL
1404 bool "Support CPUfreq changing of PLL frequency"
1405 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1407 Compile in support for changing the PLL frequency from the
1408 S3C24XX series CPUfreq driver. The PLL takes time to settle
1409 after a frequency change, so by default it is not enabled.
1411 This also means that the PLL tables for the selected CPU(s) will
1412 be built which may increase the size of the kernel image.
1414 config CPU_FREQ_S3C24XX_DEBUG
1415 bool "Debug CPUfreq Samsung driver core"
1416 depends on CPU_FREQ_S3C24XX
1418 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1420 config CPU_FREQ_S3C24XX_IODEBUG
1421 bool "Debug CPUfreq Samsung driver IO timing"
1422 depends on CPU_FREQ_S3C24XX
1424 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1426 config CPU_FREQ_S3C24XX_DEBUGFS
1427 bool "Export debugfs for CPUFreq"
1428 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1430 Export status information via debugfs.
1434 source "drivers/cpuidle/Kconfig"
1438 menu "Floating point emulation"
1440 comment "At least one emulation must be selected"
1443 bool "NWFPE math emulation"
1444 depends on !AEABI || OABI_COMPAT
1446 Say Y to include the NWFPE floating point emulator in the kernel.
1447 This is necessary to run most binaries. Linux does not currently
1448 support floating point hardware so you need to say Y here even if
1449 your machine has an FPA or floating point co-processor podule.
1451 You may say N here if you are going to load the Acorn FPEmulator
1452 early in the bootup.
1455 bool "Support extended precision"
1456 depends on FPE_NWFPE
1458 Say Y to include 80-bit support in the kernel floating-point
1459 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1460 Note that gcc does not generate 80-bit operations by default,
1461 so in most cases this option only enlarges the size of the
1462 floating point emulator without any good reason.
1464 You almost surely want to say N here.
1467 bool "FastFPE math emulation (EXPERIMENTAL)"
1468 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1470 Say Y here to include the FAST floating point emulator in the kernel.
1471 This is an experimental much faster emulator which now also has full
1472 precision for the mantissa. It does not support any exceptions.
1473 It is very simple, and approximately 3-6 times faster than NWFPE.
1475 It should be sufficient for most programs. It may be not suitable
1476 for scientific calculations, but you have to check this for yourself.
1477 If you do not feel you need a faster FP emulation you should better
1481 bool "VFP-format floating point maths"
1482 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1484 Say Y to include VFP support code in the kernel. This is needed
1485 if your hardware includes a VFP unit.
1487 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1488 release notes and additional status information.
1490 Say N if your target does not have VFP hardware.
1498 bool "Advanced SIMD (NEON) Extension support"
1499 depends on VFPv3 && CPU_V7
1501 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1506 menu "Userspace binary formats"
1508 source "fs/Kconfig.binfmt"
1511 tristate "RISC OS personality"
1514 Say Y here to include the kernel code necessary if you want to run
1515 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1516 experimental; if this sounds frightening, say N and sleep in peace.
1517 You can also say M here to compile this support as a module (which
1518 will be called arthur).
1522 menu "Power management options"
1524 source "kernel/power/Kconfig"
1526 config ARCH_SUSPEND_POSSIBLE
1531 source "net/Kconfig"
1533 source "drivers/Kconfig"
1537 source "arch/arm/Kconfig.debug"
1539 source "security/Kconfig"
1541 source "crypto/Kconfig"
1543 source "lib/Kconfig"