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>.
440 select ARCH_REQUIRE_GPIOLIB
442 select GENERIC_CLOCKEVENTS
445 Support for the Marvell Dove SoC 88AP510
448 bool "Marvell Kirkwood"
452 select ARCH_REQUIRE_GPIOLIB
454 select GENERIC_CLOCKEVENTS
457 Support for the following Marvell Kirkwood series SoCs:
458 88F6180, 88F6192 and 88F6281.
461 bool "Marvell Loki (88RC8480)"
464 select GENERIC_CLOCKEVENTS
467 Support for the Marvell Loki (88RC8480) SoC.
470 bool "Marvell MV78xx0"
474 select ARCH_REQUIRE_GPIOLIB
476 select GENERIC_CLOCKEVENTS
479 Support for the following Marvell MV78xx0 series SoCs:
488 select ARCH_REQUIRE_GPIOLIB
490 select GENERIC_CLOCKEVENTS
493 Support for the following Marvell Orion 5x series SoCs:
494 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
495 Orion-2 (5281), Orion-1-90 (6183).
498 bool "Marvell PXA168/910"
501 select ARCH_REQUIRE_GPIOLIB
505 select GENERIC_CLOCKEVENTS
509 Support for Marvell's PXA168/910 processor line.
512 bool "Micrel/Kendin KS8695"
515 select ARCH_REQUIRE_GPIOLIB
517 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
518 System-on-Chip devices.
521 bool "NetSilicon NS9xxx"
525 select GENERIC_CLOCKEVENTS
528 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
531 <http://www.digi.com/products/microprocessors/index.jsp>
534 bool "Nuvoton W90X900 CPU"
536 select ARCH_REQUIRE_GPIOLIB
541 select GENERIC_CLOCKEVENTS
543 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
544 At present, the w90x900 has been renamed nuc900, regarding
545 the ARM series product line, you can login the following
546 link address to know more.
548 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
549 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
552 bool "Philips Nexperia PNX4008 Mobile"
556 This enables support for Philips PNX4008 mobile platform.
559 bool "PXA2xx/PXA3xx-based"
562 select ARCH_HAS_CPUFREQ
566 select ARCH_REQUIRE_GPIOLIB
568 select GENERIC_CLOCKEVENTS
572 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
578 select GENERIC_CLOCKEVENTS
580 Support for Qualcomm MSM7K based systems. This runs on the ARM11
581 apps processor of the MSM7K and depends on a shared memory
582 interface to the ARM9 modem processor which runs the baseband stack
583 and controls some vital subsystems (clock and power control, etc).
590 select ARCH_MAY_HAVE_PC_FDC
591 select HAVE_PATA_PLATFORM
594 select ARCH_SPARSEMEM_ENABLE
596 On the Acorn Risc-PC, Linux can support the internal IDE disk and
597 CD-ROM interface, serial and parallel port, and the floppy drive.
603 select ARCH_SPARSEMEM_ENABLE
605 select ARCH_HAS_CPUFREQ
608 select GENERIC_CLOCKEVENTS
611 select ARCH_REQUIRE_GPIOLIB
613 Support for StrongARM 11x0 based boards.
616 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
618 select ARCH_HAS_CPUFREQ
621 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
622 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
623 the Samsung SMDK2410 development board (and derivatives).
626 bool "Samsung S3C64XX"
629 select ARCH_HAS_CPUFREQ
631 Samsung S3C64XX series based systems
634 bool "Samsung S5PC1XX"
639 Samsung S5PC1XX series based systems
649 Support for the StrongARM based Digital DNARD machine, also known
650 as "Shark" (<http://www.shark-linux.de/shark.html>).
655 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
656 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
658 Say Y here for systems based on one of the Sharp LH7A40X
659 System on a Chip processors. These CPUs include an ARM922T
660 core with a wide array of integrated devices for
661 hand-held and low-power applications.
664 bool "ST-Ericsson U300 Series"
671 select GENERIC_CLOCKEVENTS
676 Support for ST-Ericsson U300 series mobile platforms.
682 select GENERIC_CLOCKEVENTS
684 select ARCH_REQUIRE_GPIOLIB
689 select GENERIC_ALLOCATOR
691 Support for TI's DaVinci platform.
697 select ARCH_REQUIRE_GPIOLIB
698 select ARCH_HAS_CPUFREQ
700 select GENERIC_CLOCKEVENTS
702 Support for TI's OMAP platform (OMAP1 and OMAP2).
705 bool "Broadcom BCMRING"
711 select GENERIC_CLOCKEVENTS
712 select ARCH_WANT_OPTIONAL_GPIOLIB
714 Support for Broadcom's BCMRing platform.
718 source "arch/arm/mach-clps711x/Kconfig"
720 source "arch/arm/mach-ep93xx/Kconfig"
722 source "arch/arm/mach-footbridge/Kconfig"
724 source "arch/arm/mach-gemini/Kconfig"
726 source "arch/arm/mach-integrator/Kconfig"
728 source "arch/arm/mach-iop32x/Kconfig"
730 source "arch/arm/mach-iop33x/Kconfig"
732 source "arch/arm/mach-iop13xx/Kconfig"
734 source "arch/arm/mach-ixp4xx/Kconfig"
736 source "arch/arm/mach-ixp2000/Kconfig"
738 source "arch/arm/mach-ixp23xx/Kconfig"
740 source "arch/arm/mach-loki/Kconfig"
742 source "arch/arm/mach-mv78xx0/Kconfig"
744 source "arch/arm/mach-pxa/Kconfig"
745 source "arch/arm/plat-pxa/Kconfig"
747 source "arch/arm/mach-mmp/Kconfig"
749 source "arch/arm/mach-sa1100/Kconfig"
751 source "arch/arm/plat-omap/Kconfig"
753 source "arch/arm/mach-omap1/Kconfig"
755 source "arch/arm/mach-omap2/Kconfig"
757 source "arch/arm/mach-orion5x/Kconfig"
759 source "arch/arm/mach-kirkwood/Kconfig"
761 source "arch/arm/mach-dove/Kconfig"
763 source "arch/arm/plat-samsung/Kconfig"
764 source "arch/arm/plat-s3c24xx/Kconfig"
765 source "arch/arm/plat-s3c64xx/Kconfig"
766 source "arch/arm/plat-s3c/Kconfig"
767 source "arch/arm/plat-s5pc1xx/Kconfig"
770 source "arch/arm/mach-s3c2400/Kconfig"
771 source "arch/arm/mach-s3c2410/Kconfig"
772 source "arch/arm/mach-s3c2412/Kconfig"
773 source "arch/arm/mach-s3c2440/Kconfig"
774 source "arch/arm/mach-s3c2442/Kconfig"
775 source "arch/arm/mach-s3c2443/Kconfig"
779 source "arch/arm/mach-s3c6400/Kconfig"
780 source "arch/arm/mach-s3c6410/Kconfig"
783 source "arch/arm/plat-stmp3xxx/Kconfig"
786 source "arch/arm/mach-s5pc100/Kconfig"
789 source "arch/arm/mach-lh7a40x/Kconfig"
791 source "arch/arm/mach-h720x/Kconfig"
793 source "arch/arm/mach-versatile/Kconfig"
795 source "arch/arm/mach-aaec2000/Kconfig"
797 source "arch/arm/mach-realview/Kconfig"
799 source "arch/arm/mach-at91/Kconfig"
801 source "arch/arm/plat-mxc/Kconfig"
803 source "arch/arm/mach-nomadik/Kconfig"
805 source "arch/arm/mach-netx/Kconfig"
807 source "arch/arm/mach-ns9xxx/Kconfig"
809 source "arch/arm/mach-davinci/Kconfig"
811 source "arch/arm/mach-ks8695/Kconfig"
813 source "arch/arm/mach-msm/Kconfig"
815 source "arch/arm/mach-u300/Kconfig"
817 source "arch/arm/mach-w90x900/Kconfig"
819 source "arch/arm/mach-bcmring/Kconfig"
821 # Definitions to make life easier
827 select GENERIC_CLOCKEVENTS
836 source arch/arm/mm/Kconfig
839 bool "Enable iWMMXt support"
840 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
841 default y if PXA27x || PXA3xx || ARCH_MMP
843 Enable support for iWMMXt context switching at run time if
844 running on a CPU that supports it.
846 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
849 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
853 source "arch/arm/Kconfig-nommu"
856 config ARM_ERRATA_411920
857 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
858 depends on CPU_V6 && !SMP
860 Invalidation of the Instruction Cache operation can
861 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
862 It does not affect the MPCore. This option enables the ARM Ltd.
863 recommended workaround.
865 config ARM_ERRATA_430973
866 bool "ARM errata: Stale prediction on replaced interworking branch"
869 This option enables the workaround for the 430973 Cortex-A8
870 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
871 interworking branch is replaced with another code sequence at the
872 same virtual address, whether due to self-modifying code or virtual
873 to physical address re-mapping, Cortex-A8 does not recover from the
874 stale interworking branch prediction. This results in Cortex-A8
875 executing the new code sequence in the incorrect ARM or Thumb state.
876 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
877 and also flushes the branch target cache at every context switch.
878 Note that setting specific bits in the ACTLR register may not be
879 available in non-secure mode.
881 config ARM_ERRATA_458693
882 bool "ARM errata: Processor deadlock when a false hazard is created"
885 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
886 erratum. For very specific sequences of memory operations, it is
887 possible for a hazard condition intended for a cache line to instead
888 be incorrectly associated with a different cache line. This false
889 hazard might then cause a processor deadlock. The workaround enables
890 the L1 caching of the NEON accesses and disables the PLD instruction
891 in the ACTLR register. Note that setting specific bits in the ACTLR
892 register may not be available in non-secure mode.
894 config ARM_ERRATA_460075
895 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
898 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
899 erratum. Any asynchronous access to the L2 cache may encounter a
900 situation in which recent store transactions to the L2 cache are lost
901 and overwritten with stale memory contents from external memory. The
902 workaround disables the write-allocate mode for the L2 cache via the
903 ACTLR register. Note that setting specific bits in the ACTLR register
904 may not be available in non-secure mode.
908 source "arch/arm/common/Kconfig"
910 config FORCE_MAX_ZONEORDER
923 Find out whether you have ISA slots on your motherboard. ISA is the
924 name of a bus system, i.e. the way the CPU talks to the other stuff
925 inside your box. Other bus systems are PCI, EISA, MicroChannel
926 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
927 newer boards don't support it. If you have ISA, say Y, otherwise N.
929 # Select ISA DMA controller support
934 # Select ISA DMA interface
939 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
941 Find out whether you have a PCI motherboard. PCI is the name of a
942 bus system, i.e. the way the CPU talks to the other stuff inside
943 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
944 VESA. If you have PCI, say Y, otherwise N.
949 # Select the host bridge type
950 config PCI_HOST_VIA82C505
952 depends on PCI && ARCH_SHARK
955 config PCI_HOST_ITE8152
957 depends on PCI && MACH_ARMCORE
961 source "drivers/pci/Kconfig"
963 source "drivers/pcmcia/Kconfig"
967 menu "Kernel Features"
969 source "kernel/time/Kconfig"
972 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
973 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
974 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
975 depends on GENERIC_CLOCKEVENTS
976 select USE_GENERIC_SMP_HELPERS
977 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
979 This enables support for systems with more than one CPU. If you have
980 a system with only one CPU, like most personal computers, say N. If
981 you have a system with more than one CPU, say Y.
983 If you say N here, the kernel will run on single and multiprocessor
984 machines, but will use only one CPU of a multiprocessor machine. If
985 you say Y here, the kernel will run on many, but not all, single
986 processor machines. On a single processor machine, the kernel will
987 run faster if you say N here.
989 See also <file:Documentation/i386/IO-APIC.txt>,
990 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
991 <http://www.linuxdoc.org/docs.html#howto>.
993 If you don't know what to do here, say N.
999 This option enables support for the ARM system coherency unit
1005 This options enables support for the ARM timer and watchdog unit
1008 prompt "Memory split"
1011 Select the desired split between kernel and user memory.
1013 If you are not absolutely sure what you are doing, leave this
1017 bool "3G/1G user/kernel split"
1019 bool "2G/2G user/kernel split"
1021 bool "1G/3G user/kernel split"
1026 default 0x40000000 if VMSPLIT_1G
1027 default 0x80000000 if VMSPLIT_2G
1031 int "Maximum number of CPUs (2-32)"
1037 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1038 depends on SMP && HOTPLUG && EXPERIMENTAL
1040 Say Y here to experiment with turning CPUs off and on. CPUs
1041 can be controlled through /sys/devices/system/cpu.
1044 bool "Use local timer interrupts"
1045 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1046 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1048 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
1050 Enable support for local timers on SMP platforms, rather then the
1051 legacy IPI broadcast method. Local timers allows the system
1052 accounting to be spread across the timer interval, preventing a
1053 "thundering herd" at every timer tick.
1055 source kernel/Kconfig.preempt
1059 default 128 if ARCH_L7200
1060 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1061 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1062 default AT91_TIMER_HZ if ARCH_AT91
1065 config THUMB2_KERNEL
1066 bool "Compile the kernel in Thumb-2 mode"
1067 depends on CPU_V7 && EXPERIMENTAL
1069 select ARM_ASM_UNIFIED
1071 By enabling this option, the kernel will be compiled in
1072 Thumb-2 mode. A compiler/assembler that understand the unified
1073 ARM-Thumb syntax is needed.
1077 config ARM_ASM_UNIFIED
1081 bool "Use the ARM EABI to compile the kernel"
1083 This option allows for the kernel to be compiled using the latest
1084 ARM ABI (aka EABI). This is only useful if you are using a user
1085 space environment that is also compiled with EABI.
1087 Since there are major incompatibilities between the legacy ABI and
1088 EABI, especially with regard to structure member alignment, this
1089 option also changes the kernel syscall calling convention to
1090 disambiguate both ABIs and allow for backward compatibility support
1091 (selected with CONFIG_OABI_COMPAT).
1093 To use this you need GCC version 4.0.0 or later.
1096 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1097 depends on AEABI && EXPERIMENTAL
1100 This option preserves the old syscall interface along with the
1101 new (ARM EABI) one. It also provides a compatibility layer to
1102 intercept syscalls that have structure arguments which layout
1103 in memory differs between the legacy ABI and the new ARM EABI
1104 (only for non "thumb" binaries). This option adds a tiny
1105 overhead to all syscalls and produces a slightly larger kernel.
1106 If you know you'll be using only pure EABI user space then you
1107 can say N here. If this option is not selected and you attempt
1108 to execute a legacy ABI binary then the result will be
1109 UNPREDICTABLE (in fact it can be predicted that it won't work
1110 at all). If in doubt say Y.
1112 config ARCH_HAS_HOLES_MEMORYMODEL
1115 # Discontigmem is deprecated
1116 config ARCH_DISCONTIGMEM_ENABLE
1119 config ARCH_SPARSEMEM_ENABLE
1122 config ARCH_SPARSEMEM_DEFAULT
1123 def_bool ARCH_SPARSEMEM_ENABLE
1125 config ARCH_SELECT_MEMORY_MODEL
1126 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1130 default "4" if ARCH_LH7A40X
1132 depends on NEED_MULTIPLE_NODES
1135 bool "High Memory Support (EXPERIMENTAL)"
1136 depends on MMU && EXPERIMENTAL
1138 The address space of ARM processors is only 4 Gigabytes large
1139 and it has to accommodate user address space, kernel address
1140 space as well as some memory mapped IO. That means that, if you
1141 have a large amount of physical memory and/or IO, not all of the
1142 memory can be "permanently mapped" by the kernel. The physical
1143 memory that is not permanently mapped is called "high memory".
1145 Depending on the selected kernel/user memory split, minimum
1146 vmalloc space and actual amount of RAM, you may not need this
1147 option which should result in a slightly faster kernel.
1152 bool "Allocate 2nd-level pagetables from highmem"
1154 depends on !OUTER_CACHE
1159 bool "Timer and CPU usage LEDs"
1160 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1161 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1162 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1163 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1164 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1165 ARCH_AT91 || ARCH_DAVINCI || \
1166 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1168 If you say Y here, the LEDs on your machine will be used
1169 to provide useful information about your current system status.
1171 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1172 be able to select which LEDs are active using the options below. If
1173 you are compiling a kernel for the EBSA-110 or the LART however, the
1174 red LED will simply flash regularly to indicate that the system is
1175 still functional. It is safe to say Y here if you have a CATS
1176 system, but the driver will do nothing.
1179 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1180 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1181 || MACH_OMAP_PERSEUS2
1183 depends on !GENERIC_CLOCKEVENTS
1184 default y if ARCH_EBSA110
1186 If you say Y here, one of the system LEDs (the green one on the
1187 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1188 will flash regularly to indicate that the system is still
1189 operational. This is mainly useful to kernel hackers who are
1190 debugging unstable kernels.
1192 The LART uses the same LED for both Timer LED and CPU usage LED
1193 functions. You may choose to use both, but the Timer LED function
1194 will overrule the CPU usage LED.
1197 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1199 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1200 || MACH_OMAP_PERSEUS2
1203 If you say Y here, the red LED will be used to give a good real
1204 time indication of CPU usage, by lighting whenever the idle task
1205 is not currently executing.
1207 The LART uses the same LED for both Timer LED and CPU usage LED
1208 functions. You may choose to use both, but the Timer LED function
1209 will overrule the CPU usage LED.
1211 config ALIGNMENT_TRAP
1213 depends on CPU_CP15_MMU
1214 default y if !ARCH_EBSA110
1216 ARM processors cannot fetch/store information which is not
1217 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1218 address divisible by 4. On 32-bit ARM processors, these non-aligned
1219 fetch/store instructions will be emulated in software if you say
1220 here, which has a severe performance impact. This is necessary for
1221 correct operation of some network protocols. With an IP-only
1222 configuration it is safe to say N, otherwise say Y.
1224 config UACCESS_WITH_MEMCPY
1225 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1226 depends on MMU && EXPERIMENTAL
1227 default y if CPU_FEROCEON
1229 Implement faster copy_to_user and clear_user methods for CPU
1230 cores where a 8-word STM instruction give significantly higher
1231 memory write throughput than a sequence of individual 32bit stores.
1233 A possible side effect is a slight increase in scheduling latency
1234 between threads sharing the same address space if they invoke
1235 such copy operations with large buffers.
1237 However, if the CPU data cache is using a write-allocate mode,
1238 this option is unlikely to provide any performance gain.
1244 # Compressed boot loader in ROM. Yes, we really want to ask about
1245 # TEXT and BSS so we preserve their values in the config files.
1246 config ZBOOT_ROM_TEXT
1247 hex "Compressed ROM boot loader base address"
1250 The physical address at which the ROM-able zImage is to be
1251 placed in the target. Platforms which normally make use of
1252 ROM-able zImage formats normally set this to a suitable
1253 value in their defconfig file.
1255 If ZBOOT_ROM is not enabled, this has no effect.
1257 config ZBOOT_ROM_BSS
1258 hex "Compressed ROM boot loader BSS address"
1261 The base address of an area of read/write memory in the target
1262 for the ROM-able zImage which must be available while the
1263 decompressor is running. It must be large enough to hold the
1264 entire decompressed kernel plus an additional 128 KiB.
1265 Platforms which normally make use of ROM-able zImage formats
1266 normally set this to a suitable value in their defconfig file.
1268 If ZBOOT_ROM is not enabled, this has no effect.
1271 bool "Compressed boot loader in ROM/flash"
1272 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1274 Say Y here if you intend to execute your compressed kernel image
1275 (zImage) directly from ROM or flash. If unsure, say N.
1278 string "Default kernel command string"
1281 On some architectures (EBSA110 and CATS), there is currently no way
1282 for the boot loader to pass arguments to the kernel. For these
1283 architectures, you should supply some command-line options at build
1284 time by entering them here. As a minimum, you should specify the
1285 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1288 bool "Kernel Execute-In-Place from ROM"
1289 depends on !ZBOOT_ROM
1291 Execute-In-Place allows the kernel to run from non-volatile storage
1292 directly addressable by the CPU, such as NOR flash. This saves RAM
1293 space since the text section of the kernel is not loaded from flash
1294 to RAM. Read-write sections, such as the data section and stack,
1295 are still copied to RAM. The XIP kernel is not compressed since
1296 it has to run directly from flash, so it will take more space to
1297 store it. The flash address used to link the kernel object files,
1298 and for storing it, is configuration dependent. Therefore, if you
1299 say Y here, you must know the proper physical address where to
1300 store the kernel image depending on your own flash memory usage.
1302 Also note that the make target becomes "make xipImage" rather than
1303 "make zImage" or "make Image". The final kernel binary to put in
1304 ROM memory will be arch/arm/boot/xipImage.
1308 config XIP_PHYS_ADDR
1309 hex "XIP Kernel Physical Location"
1310 depends on XIP_KERNEL
1311 default "0x00080000"
1313 This is the physical address in your flash memory the kernel will
1314 be linked for and stored to. This address is dependent on your
1318 bool "Kexec system call (EXPERIMENTAL)"
1319 depends on EXPERIMENTAL
1321 kexec is a system call that implements the ability to shutdown your
1322 current kernel, and to start another kernel. It is like a reboot
1323 but it is independent of the system firmware. And like a reboot
1324 you can start any kernel with it, not just Linux.
1326 It is an ongoing process to be certain the hardware in a machine
1327 is properly shutdown, so do not be surprised if this code does not
1328 initially work for you. It may help to enable device hotplugging
1332 bool "Export atags in procfs"
1336 Should the atags used to boot the kernel be exported in an "atags"
1337 file in procfs. Useful with kexec.
1341 menu "CPU Power Management"
1345 source "drivers/cpufreq/Kconfig"
1347 config CPU_FREQ_SA1100
1349 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1352 config CPU_FREQ_SA1110
1354 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1357 config CPU_FREQ_INTEGRATOR
1358 tristate "CPUfreq driver for ARM Integrator CPUs"
1359 depends on ARCH_INTEGRATOR && CPU_FREQ
1362 This enables the CPUfreq driver for ARM Integrator CPUs.
1364 For details, take a look at <file:Documentation/cpu-freq>.
1370 depends on CPU_FREQ && ARCH_PXA && PXA25x
1372 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1374 config CPU_FREQ_S3C64XX
1375 bool "CPUfreq support for Samsung S3C64XX CPUs"
1376 depends on CPU_FREQ && CPU_S3C6410
1381 Internal configuration node for common cpufreq on Samsung SoC
1383 config CPU_FREQ_S3C24XX
1384 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1385 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1388 This enables the CPUfreq driver for the Samsung S3C24XX family
1391 For details, take a look at <file:Documentation/cpu-freq>.
1395 config CPU_FREQ_S3C24XX_PLL
1396 bool "Support CPUfreq changing of PLL frequency"
1397 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1399 Compile in support for changing the PLL frequency from the
1400 S3C24XX series CPUfreq driver. The PLL takes time to settle
1401 after a frequency change, so by default it is not enabled.
1403 This also means that the PLL tables for the selected CPU(s) will
1404 be built which may increase the size of the kernel image.
1406 config CPU_FREQ_S3C24XX_DEBUG
1407 bool "Debug CPUfreq Samsung driver core"
1408 depends on CPU_FREQ_S3C24XX
1410 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1412 config CPU_FREQ_S3C24XX_IODEBUG
1413 bool "Debug CPUfreq Samsung driver IO timing"
1414 depends on CPU_FREQ_S3C24XX
1416 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1418 config CPU_FREQ_S3C24XX_DEBUGFS
1419 bool "Export debugfs for CPUFreq"
1420 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1422 Export status information via debugfs.
1426 source "drivers/cpuidle/Kconfig"
1430 menu "Floating point emulation"
1432 comment "At least one emulation must be selected"
1435 bool "NWFPE math emulation"
1436 depends on !AEABI || OABI_COMPAT
1438 Say Y to include the NWFPE floating point emulator in the kernel.
1439 This is necessary to run most binaries. Linux does not currently
1440 support floating point hardware so you need to say Y here even if
1441 your machine has an FPA or floating point co-processor podule.
1443 You may say N here if you are going to load the Acorn FPEmulator
1444 early in the bootup.
1447 bool "Support extended precision"
1448 depends on FPE_NWFPE
1450 Say Y to include 80-bit support in the kernel floating-point
1451 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1452 Note that gcc does not generate 80-bit operations by default,
1453 so in most cases this option only enlarges the size of the
1454 floating point emulator without any good reason.
1456 You almost surely want to say N here.
1459 bool "FastFPE math emulation (EXPERIMENTAL)"
1460 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1462 Say Y here to include the FAST floating point emulator in the kernel.
1463 This is an experimental much faster emulator which now also has full
1464 precision for the mantissa. It does not support any exceptions.
1465 It is very simple, and approximately 3-6 times faster than NWFPE.
1467 It should be sufficient for most programs. It may be not suitable
1468 for scientific calculations, but you have to check this for yourself.
1469 If you do not feel you need a faster FP emulation you should better
1473 bool "VFP-format floating point maths"
1474 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1476 Say Y to include VFP support code in the kernel. This is needed
1477 if your hardware includes a VFP unit.
1479 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1480 release notes and additional status information.
1482 Say N if your target does not have VFP hardware.
1490 bool "Advanced SIMD (NEON) Extension support"
1491 depends on VFPv3 && CPU_V7
1493 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1498 menu "Userspace binary formats"
1500 source "fs/Kconfig.binfmt"
1503 tristate "RISC OS personality"
1506 Say Y here to include the kernel code necessary if you want to run
1507 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1508 experimental; if this sounds frightening, say N and sleep in peace.
1509 You can also say M here to compile this support as a module (which
1510 will be called arthur).
1514 menu "Power management options"
1516 source "kernel/power/Kconfig"
1518 config ARCH_SUSPEND_POSSIBLE
1523 source "net/Kconfig"
1525 source "drivers/Kconfig"
1529 source "arch/arm/Kconfig.debug"
1531 source "security/Kconfig"
1533 source "crypto/Kconfig"
1535 source "lib/Kconfig"