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-s3c24xx/Kconfig"
764 source "arch/arm/plat-s3c64xx/Kconfig"
765 source "arch/arm/plat-s3c/Kconfig"
766 source "arch/arm/plat-s5pc1xx/Kconfig"
769 source "arch/arm/mach-s3c2400/Kconfig"
770 source "arch/arm/mach-s3c2410/Kconfig"
771 source "arch/arm/mach-s3c2412/Kconfig"
772 source "arch/arm/mach-s3c2440/Kconfig"
773 source "arch/arm/mach-s3c2442/Kconfig"
774 source "arch/arm/mach-s3c2443/Kconfig"
778 source "arch/arm/mach-s3c6400/Kconfig"
779 source "arch/arm/mach-s3c6410/Kconfig"
782 source "arch/arm/plat-stmp3xxx/Kconfig"
785 source "arch/arm/mach-s5pc100/Kconfig"
788 source "arch/arm/mach-lh7a40x/Kconfig"
790 source "arch/arm/mach-h720x/Kconfig"
792 source "arch/arm/mach-versatile/Kconfig"
794 source "arch/arm/mach-aaec2000/Kconfig"
796 source "arch/arm/mach-realview/Kconfig"
798 source "arch/arm/mach-at91/Kconfig"
800 source "arch/arm/plat-mxc/Kconfig"
802 source "arch/arm/mach-nomadik/Kconfig"
804 source "arch/arm/mach-netx/Kconfig"
806 source "arch/arm/mach-ns9xxx/Kconfig"
808 source "arch/arm/mach-davinci/Kconfig"
810 source "arch/arm/mach-ks8695/Kconfig"
812 source "arch/arm/mach-msm/Kconfig"
814 source "arch/arm/mach-u300/Kconfig"
816 source "arch/arm/mach-w90x900/Kconfig"
818 source "arch/arm/mach-bcmring/Kconfig"
820 # Definitions to make life easier
833 source arch/arm/mm/Kconfig
836 bool "Enable iWMMXt support"
837 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
838 default y if PXA27x || PXA3xx || ARCH_MMP
840 Enable support for iWMMXt context switching at run time if
841 running on a CPU that supports it.
843 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
846 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
850 source "arch/arm/Kconfig-nommu"
853 config ARM_ERRATA_411920
854 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
855 depends on CPU_V6 && !SMP
857 Invalidation of the Instruction Cache operation can
858 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
859 It does not affect the MPCore. This option enables the ARM Ltd.
860 recommended workaround.
862 config ARM_ERRATA_430973
863 bool "ARM errata: Stale prediction on replaced interworking branch"
866 This option enables the workaround for the 430973 Cortex-A8
867 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
868 interworking branch is replaced with another code sequence at the
869 same virtual address, whether due to self-modifying code or virtual
870 to physical address re-mapping, Cortex-A8 does not recover from the
871 stale interworking branch prediction. This results in Cortex-A8
872 executing the new code sequence in the incorrect ARM or Thumb state.
873 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
874 and also flushes the branch target cache at every context switch.
875 Note that setting specific bits in the ACTLR register may not be
876 available in non-secure mode.
878 config ARM_ERRATA_458693
879 bool "ARM errata: Processor deadlock when a false hazard is created"
882 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
883 erratum. For very specific sequences of memory operations, it is
884 possible for a hazard condition intended for a cache line to instead
885 be incorrectly associated with a different cache line. This false
886 hazard might then cause a processor deadlock. The workaround enables
887 the L1 caching of the NEON accesses and disables the PLD instruction
888 in the ACTLR register. Note that setting specific bits in the ACTLR
889 register may not be available in non-secure mode.
891 config ARM_ERRATA_460075
892 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
895 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
896 erratum. Any asynchronous access to the L2 cache may encounter a
897 situation in which recent store transactions to the L2 cache are lost
898 and overwritten with stale memory contents from external memory. The
899 workaround disables the write-allocate mode for the L2 cache via the
900 ACTLR register. Note that setting specific bits in the ACTLR register
901 may not be available in non-secure mode.
905 source "arch/arm/common/Kconfig"
907 config FORCE_MAX_ZONEORDER
920 Find out whether you have ISA slots on your motherboard. ISA is the
921 name of a bus system, i.e. the way the CPU talks to the other stuff
922 inside your box. Other bus systems are PCI, EISA, MicroChannel
923 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
924 newer boards don't support it. If you have ISA, say Y, otherwise N.
926 # Select ISA DMA controller support
931 # Select ISA DMA interface
936 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
938 Find out whether you have a PCI motherboard. PCI is the name of a
939 bus system, i.e. the way the CPU talks to the other stuff inside
940 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
941 VESA. If you have PCI, say Y, otherwise N.
946 # Select the host bridge type
947 config PCI_HOST_VIA82C505
949 depends on PCI && ARCH_SHARK
952 config PCI_HOST_ITE8152
954 depends on PCI && MACH_ARMCORE
958 source "drivers/pci/Kconfig"
960 source "drivers/pcmcia/Kconfig"
964 menu "Kernel Features"
966 source "kernel/time/Kconfig"
969 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
970 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
971 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
972 depends on GENERIC_CLOCKEVENTS
973 select USE_GENERIC_SMP_HELPERS
974 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
976 This enables support for systems with more than one CPU. If you have
977 a system with only one CPU, like most personal computers, say N. If
978 you have a system with more than one CPU, say Y.
980 If you say N here, the kernel will run on single and multiprocessor
981 machines, but will use only one CPU of a multiprocessor machine. If
982 you say Y here, the kernel will run on many, but not all, single
983 processor machines. On a single processor machine, the kernel will
984 run faster if you say N here.
986 See also <file:Documentation/i386/IO-APIC.txt>,
987 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
988 <http://www.linuxdoc.org/docs.html#howto>.
990 If you don't know what to do here, say N.
996 This option enables support for the ARM system coherency unit
1002 This options enables support for the ARM timer and watchdog unit
1005 prompt "Memory split"
1008 Select the desired split between kernel and user memory.
1010 If you are not absolutely sure what you are doing, leave this
1014 bool "3G/1G user/kernel split"
1016 bool "2G/2G user/kernel split"
1018 bool "1G/3G user/kernel split"
1023 default 0x40000000 if VMSPLIT_1G
1024 default 0x80000000 if VMSPLIT_2G
1028 int "Maximum number of CPUs (2-32)"
1034 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1035 depends on SMP && HOTPLUG && EXPERIMENTAL
1037 Say Y here to experiment with turning CPUs off and on. CPUs
1038 can be controlled through /sys/devices/system/cpu.
1041 bool "Use local timer interrupts"
1042 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1043 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1045 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
1047 Enable support for local timers on SMP platforms, rather then the
1048 legacy IPI broadcast method. Local timers allows the system
1049 accounting to be spread across the timer interval, preventing a
1050 "thundering herd" at every timer tick.
1052 source kernel/Kconfig.preempt
1056 default 128 if ARCH_L7200
1057 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1058 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1059 default AT91_TIMER_HZ if ARCH_AT91
1062 config THUMB2_KERNEL
1063 bool "Compile the kernel in Thumb-2 mode"
1064 depends on CPU_V7 && EXPERIMENTAL
1066 select ARM_ASM_UNIFIED
1068 By enabling this option, the kernel will be compiled in
1069 Thumb-2 mode. A compiler/assembler that understand the unified
1070 ARM-Thumb syntax is needed.
1074 config ARM_ASM_UNIFIED
1078 bool "Use the ARM EABI to compile the kernel"
1080 This option allows for the kernel to be compiled using the latest
1081 ARM ABI (aka EABI). This is only useful if you are using a user
1082 space environment that is also compiled with EABI.
1084 Since there are major incompatibilities between the legacy ABI and
1085 EABI, especially with regard to structure member alignment, this
1086 option also changes the kernel syscall calling convention to
1087 disambiguate both ABIs and allow for backward compatibility support
1088 (selected with CONFIG_OABI_COMPAT).
1090 To use this you need GCC version 4.0.0 or later.
1093 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1094 depends on AEABI && EXPERIMENTAL
1097 This option preserves the old syscall interface along with the
1098 new (ARM EABI) one. It also provides a compatibility layer to
1099 intercept syscalls that have structure arguments which layout
1100 in memory differs between the legacy ABI and the new ARM EABI
1101 (only for non "thumb" binaries). This option adds a tiny
1102 overhead to all syscalls and produces a slightly larger kernel.
1103 If you know you'll be using only pure EABI user space then you
1104 can say N here. If this option is not selected and you attempt
1105 to execute a legacy ABI binary then the result will be
1106 UNPREDICTABLE (in fact it can be predicted that it won't work
1107 at all). If in doubt say Y.
1109 config ARCH_HAS_HOLES_MEMORYMODEL
1112 # Discontigmem is deprecated
1113 config ARCH_DISCONTIGMEM_ENABLE
1116 config ARCH_SPARSEMEM_ENABLE
1119 config ARCH_SPARSEMEM_DEFAULT
1120 def_bool ARCH_SPARSEMEM_ENABLE
1122 config ARCH_SELECT_MEMORY_MODEL
1123 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1127 default "4" if ARCH_LH7A40X
1129 depends on NEED_MULTIPLE_NODES
1132 bool "High Memory Support (EXPERIMENTAL)"
1133 depends on MMU && EXPERIMENTAL
1135 The address space of ARM processors is only 4 Gigabytes large
1136 and it has to accommodate user address space, kernel address
1137 space as well as some memory mapped IO. That means that, if you
1138 have a large amount of physical memory and/or IO, not all of the
1139 memory can be "permanently mapped" by the kernel. The physical
1140 memory that is not permanently mapped is called "high memory".
1142 Depending on the selected kernel/user memory split, minimum
1143 vmalloc space and actual amount of RAM, you may not need this
1144 option which should result in a slightly faster kernel.
1149 bool "Allocate 2nd-level pagetables from highmem"
1151 depends on !OUTER_CACHE
1156 bool "Timer and CPU usage LEDs"
1157 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1158 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1159 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1160 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1161 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1162 ARCH_AT91 || ARCH_DAVINCI || \
1163 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1165 If you say Y here, the LEDs on your machine will be used
1166 to provide useful information about your current system status.
1168 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1169 be able to select which LEDs are active using the options below. If
1170 you are compiling a kernel for the EBSA-110 or the LART however, the
1171 red LED will simply flash regularly to indicate that the system is
1172 still functional. It is safe to say Y here if you have a CATS
1173 system, but the driver will do nothing.
1176 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1177 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1178 || MACH_OMAP_PERSEUS2
1180 depends on !GENERIC_CLOCKEVENTS
1181 default y if ARCH_EBSA110
1183 If you say Y here, one of the system LEDs (the green one on the
1184 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1185 will flash regularly to indicate that the system is still
1186 operational. This is mainly useful to kernel hackers who are
1187 debugging unstable kernels.
1189 The LART uses the same LED for both Timer LED and CPU usage LED
1190 functions. You may choose to use both, but the Timer LED function
1191 will overrule the CPU usage LED.
1194 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1196 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1197 || MACH_OMAP_PERSEUS2
1200 If you say Y here, the red LED will be used to give a good real
1201 time indication of CPU usage, by lighting whenever the idle task
1202 is not currently executing.
1204 The LART uses the same LED for both Timer LED and CPU usage LED
1205 functions. You may choose to use both, but the Timer LED function
1206 will overrule the CPU usage LED.
1208 config ALIGNMENT_TRAP
1210 depends on CPU_CP15_MMU
1211 default y if !ARCH_EBSA110
1213 ARM processors cannot fetch/store information which is not
1214 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1215 address divisible by 4. On 32-bit ARM processors, these non-aligned
1216 fetch/store instructions will be emulated in software if you say
1217 here, which has a severe performance impact. This is necessary for
1218 correct operation of some network protocols. With an IP-only
1219 configuration it is safe to say N, otherwise say Y.
1221 config UACCESS_WITH_MEMCPY
1222 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1223 depends on MMU && EXPERIMENTAL
1224 default y if CPU_FEROCEON
1226 Implement faster copy_to_user and clear_user methods for CPU
1227 cores where a 8-word STM instruction give significantly higher
1228 memory write throughput than a sequence of individual 32bit stores.
1230 A possible side effect is a slight increase in scheduling latency
1231 between threads sharing the same address space if they invoke
1232 such copy operations with large buffers.
1234 However, if the CPU data cache is using a write-allocate mode,
1235 this option is unlikely to provide any performance gain.
1241 # Compressed boot loader in ROM. Yes, we really want to ask about
1242 # TEXT and BSS so we preserve their values in the config files.
1243 config ZBOOT_ROM_TEXT
1244 hex "Compressed ROM boot loader base address"
1247 The physical address at which the ROM-able zImage is to be
1248 placed in the target. Platforms which normally make use of
1249 ROM-able zImage formats normally set this to a suitable
1250 value in their defconfig file.
1252 If ZBOOT_ROM is not enabled, this has no effect.
1254 config ZBOOT_ROM_BSS
1255 hex "Compressed ROM boot loader BSS address"
1258 The base address of an area of read/write memory in the target
1259 for the ROM-able zImage which must be available while the
1260 decompressor is running. It must be large enough to hold the
1261 entire decompressed kernel plus an additional 128 KiB.
1262 Platforms which normally make use of ROM-able zImage formats
1263 normally set this to a suitable value in their defconfig file.
1265 If ZBOOT_ROM is not enabled, this has no effect.
1268 bool "Compressed boot loader in ROM/flash"
1269 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1271 Say Y here if you intend to execute your compressed kernel image
1272 (zImage) directly from ROM or flash. If unsure, say N.
1275 string "Default kernel command string"
1278 On some architectures (EBSA110 and CATS), there is currently no way
1279 for the boot loader to pass arguments to the kernel. For these
1280 architectures, you should supply some command-line options at build
1281 time by entering them here. As a minimum, you should specify the
1282 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1285 bool "Kernel Execute-In-Place from ROM"
1286 depends on !ZBOOT_ROM
1288 Execute-In-Place allows the kernel to run from non-volatile storage
1289 directly addressable by the CPU, such as NOR flash. This saves RAM
1290 space since the text section of the kernel is not loaded from flash
1291 to RAM. Read-write sections, such as the data section and stack,
1292 are still copied to RAM. The XIP kernel is not compressed since
1293 it has to run directly from flash, so it will take more space to
1294 store it. The flash address used to link the kernel object files,
1295 and for storing it, is configuration dependent. Therefore, if you
1296 say Y here, you must know the proper physical address where to
1297 store the kernel image depending on your own flash memory usage.
1299 Also note that the make target becomes "make xipImage" rather than
1300 "make zImage" or "make Image". The final kernel binary to put in
1301 ROM memory will be arch/arm/boot/xipImage.
1305 config XIP_PHYS_ADDR
1306 hex "XIP Kernel Physical Location"
1307 depends on XIP_KERNEL
1308 default "0x00080000"
1310 This is the physical address in your flash memory the kernel will
1311 be linked for and stored to. This address is dependent on your
1315 bool "Kexec system call (EXPERIMENTAL)"
1316 depends on EXPERIMENTAL
1318 kexec is a system call that implements the ability to shutdown your
1319 current kernel, and to start another kernel. It is like a reboot
1320 but it is independent of the system firmware. And like a reboot
1321 you can start any kernel with it, not just Linux.
1323 It is an ongoing process to be certain the hardware in a machine
1324 is properly shutdown, so do not be surprised if this code does not
1325 initially work for you. It may help to enable device hotplugging
1329 bool "Export atags in procfs"
1333 Should the atags used to boot the kernel be exported in an "atags"
1334 file in procfs. Useful with kexec.
1338 menu "CPU Power Management"
1342 source "drivers/cpufreq/Kconfig"
1344 config CPU_FREQ_SA1100
1346 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1349 config CPU_FREQ_SA1110
1351 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1354 config CPU_FREQ_INTEGRATOR
1355 tristate "CPUfreq driver for ARM Integrator CPUs"
1356 depends on ARCH_INTEGRATOR && CPU_FREQ
1359 This enables the CPUfreq driver for ARM Integrator CPUs.
1361 For details, take a look at <file:Documentation/cpu-freq>.
1367 depends on CPU_FREQ && ARCH_PXA && PXA25x
1369 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1371 config CPU_FREQ_S3C64XX
1372 bool "CPUfreq support for Samsung S3C64XX CPUs"
1373 depends on CPU_FREQ && CPU_S3C6410
1378 Internal configuration node for common cpufreq on Samsung SoC
1380 config CPU_FREQ_S3C24XX
1381 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1382 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1385 This enables the CPUfreq driver for the Samsung S3C24XX family
1388 For details, take a look at <file:Documentation/cpu-freq>.
1392 config CPU_FREQ_S3C24XX_PLL
1393 bool "Support CPUfreq changing of PLL frequency"
1394 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1396 Compile in support for changing the PLL frequency from the
1397 S3C24XX series CPUfreq driver. The PLL takes time to settle
1398 after a frequency change, so by default it is not enabled.
1400 This also means that the PLL tables for the selected CPU(s) will
1401 be built which may increase the size of the kernel image.
1403 config CPU_FREQ_S3C24XX_DEBUG
1404 bool "Debug CPUfreq Samsung driver core"
1405 depends on CPU_FREQ_S3C24XX
1407 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1409 config CPU_FREQ_S3C24XX_IODEBUG
1410 bool "Debug CPUfreq Samsung driver IO timing"
1411 depends on CPU_FREQ_S3C24XX
1413 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1415 config CPU_FREQ_S3C24XX_DEBUGFS
1416 bool "Export debugfs for CPUFreq"
1417 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1419 Export status information via debugfs.
1423 source "drivers/cpuidle/Kconfig"
1427 menu "Floating point emulation"
1429 comment "At least one emulation must be selected"
1432 bool "NWFPE math emulation"
1433 depends on !AEABI || OABI_COMPAT
1435 Say Y to include the NWFPE floating point emulator in the kernel.
1436 This is necessary to run most binaries. Linux does not currently
1437 support floating point hardware so you need to say Y here even if
1438 your machine has an FPA or floating point co-processor podule.
1440 You may say N here if you are going to load the Acorn FPEmulator
1441 early in the bootup.
1444 bool "Support extended precision"
1445 depends on FPE_NWFPE
1447 Say Y to include 80-bit support in the kernel floating-point
1448 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1449 Note that gcc does not generate 80-bit operations by default,
1450 so in most cases this option only enlarges the size of the
1451 floating point emulator without any good reason.
1453 You almost surely want to say N here.
1456 bool "FastFPE math emulation (EXPERIMENTAL)"
1457 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1459 Say Y here to include the FAST floating point emulator in the kernel.
1460 This is an experimental much faster emulator which now also has full
1461 precision for the mantissa. It does not support any exceptions.
1462 It is very simple, and approximately 3-6 times faster than NWFPE.
1464 It should be sufficient for most programs. It may be not suitable
1465 for scientific calculations, but you have to check this for yourself.
1466 If you do not feel you need a faster FP emulation you should better
1470 bool "VFP-format floating point maths"
1471 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1473 Say Y to include VFP support code in the kernel. This is needed
1474 if your hardware includes a VFP unit.
1476 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1477 release notes and additional status information.
1479 Say N if your target does not have VFP hardware.
1487 bool "Advanced SIMD (NEON) Extension support"
1488 depends on VFPv3 && CPU_V7
1490 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1495 menu "Userspace binary formats"
1497 source "fs/Kconfig.binfmt"
1500 tristate "RISC OS personality"
1503 Say Y here to include the kernel code necessary if you want to run
1504 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1505 experimental; if this sounds frightening, say N and sleep in peace.
1506 You can also say M here to compile this support as a module (which
1507 will be called arthur).
1511 menu "Power management options"
1513 source "kernel/power/Kconfig"
1515 config ARCH_SUSPEND_POSSIBLE
1520 source "net/Kconfig"
1522 source "drivers/Kconfig"
1526 source "arch/arm/Kconfig.debug"
1528 source "security/Kconfig"
1530 source "crypto/Kconfig"
1532 source "lib/Kconfig"