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
55 The Extended Industry Standard Architecture (EISA) bus was
56 developed as an open alternative to the IBM MicroChannel bus.
58 The EISA bus provided some of the features of the IBM MicroChannel
59 bus while maintaining backward compatibility with cards made for
60 the older ISA bus. The EISA bus saw limited use between 1988 and
61 1995 when it was made obsolete by the PCI bus.
63 Say Y here if you are building a kernel for an EISA-based machine.
73 MicroChannel Architecture is found in some IBM PS/2 machines and
74 laptops. It is a bus system similar to PCI or ISA. See
75 <file:Documentation/mca.txt> (and especially the web page given
76 there) before attempting to build an MCA bus kernel.
78 config GENERIC_HARDIRQS
82 config STACKTRACE_SUPPORT
86 config HAVE_LATENCYTOP_SUPPORT
91 config LOCKDEP_SUPPORT
95 config TRACE_IRQFLAGS_SUPPORT
99 config HARDIRQS_SW_RESEND
103 config GENERIC_IRQ_PROBE
107 config GENERIC_LOCKBREAK
110 depends on SMP && PREEMPT
112 config RWSEM_GENERIC_SPINLOCK
116 config RWSEM_XCHGADD_ALGORITHM
119 config ARCH_HAS_ILOG2_U32
122 config ARCH_HAS_ILOG2_U64
125 config ARCH_HAS_CPUFREQ
128 Internal node to signify that the ARCH has CPUFREQ support
129 and that the relevant menu configurations are displayed for
132 config GENERIC_HWEIGHT
136 config GENERIC_CALIBRATE_DELAY
140 config ARCH_MAY_HAVE_PC_FDC
146 config GENERIC_ISA_DMA
155 config GENERIC_HARDIRQS_NO__DO_IRQ
160 config OPROFILE_ARMV6
162 depends on CPU_V6 && !SMP
163 select OPROFILE_ARM11_CORE
165 config OPROFILE_MPCORE
167 depends on CPU_V6 && SMP
168 select OPROFILE_ARM11_CORE
170 config OPROFILE_ARM11_CORE
173 config OPROFILE_ARMV7
175 depends on CPU_V7 && !SMP
182 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
183 default DRAM_BASE if REMAP_VECTORS_TO_RAM
186 The base address of exception vectors.
188 source "init/Kconfig"
190 source "kernel/Kconfig.freezer"
195 bool "MMU-based Paged Memory Management Support"
198 Select if you want MMU-based virtualised addressing space
199 support by paged memory management. If unsure, say 'Y'.
202 prompt "ARM system type"
203 default ARCH_VERSATILE
206 bool "Agilent AAEC-2000 based"
211 This enables support for systems based on the Agilent AAEC-2000
213 config ARCH_INTEGRATOR
214 bool "ARM Ltd. Integrator family"
216 select ARCH_HAS_CPUFREQ
221 Support for ARM's Integrator platform.
224 bool "ARM Ltd. RealView family"
230 select GENERIC_CLOCKEVENTS
232 This enables support for ARM Ltd RealView boards.
234 config ARCH_VERSATILE
235 bool "ARM Ltd. Versatile family"
242 select GENERIC_CLOCKEVENTS
244 This enables support for ARM Ltd Versatile board.
249 select ARCH_REQUIRE_GPIOLIB
252 This enables support for systems based on the Atmel AT91RM9200,
253 AT91SAM9 and AT91CAP9 processors.
256 bool "Cirrus Logic CLPS711x/EP721x-based"
259 Support for Cirrus Logic 711x/721x based boards.
262 bool "Cortina Systems Gemini"
265 select ARCH_REQUIRE_GPIOLIB
267 Support for the Cortina Systems Gemini family SoCs
275 This is an evaluation board for the StrongARM processor available
276 from Digital. It has limited hardware on-board, including an
277 Ethernet interface, two PCMCIA sockets, two serial ports and a
288 select ARCH_REQUIRE_GPIOLIB
289 select ARCH_HAS_HOLES_MEMORYMODEL
291 This enables support for the Cirrus EP93xx series of CPUs.
293 config ARCH_FOOTBRIDGE
298 Support for systems based on the DC21285 companion chip
299 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
302 bool "Freescale MXC/iMX-based"
304 select GENERIC_CLOCKEVENTS
307 select ARCH_REQUIRE_GPIOLIB
310 Support for Freescale MXC/iMX-based family of processors
313 bool "Freescale STMP3xxx"
317 select ARCH_REQUIRE_GPIOLIB
319 select GENERIC_CLOCKEVENTS
321 select USB_ARCH_HAS_EHCI
323 Support for systems based on the Freescale 3xxx CPUs.
326 bool "Hilscher NetX based"
329 select GENERIC_CLOCKEVENTS
332 This enables support for systems based on the Hilscher NetX Soc
335 bool "Hynix HMS720x-based"
339 This enables support for systems based on the Hynix HMS720x
347 select ARCH_SUPPORTS_MSI
350 Support for Intel's IOP13XX (XScale) family of processors.
359 select ARCH_REQUIRE_GPIOLIB
361 Support for Intel's 80219 and IOP32X (XScale) family of
371 select ARCH_REQUIRE_GPIOLIB
373 Support for Intel's IOP33X (XScale) family of processors.
381 Support for Intel's IXP23xx (XScale) family of processors.
384 bool "IXP2400/2800-based"
389 Support for Intel's IXP2400/2800 (XScale) family of processors.
397 select GENERIC_CLOCKEVENTS
398 select DMABOUNCE if PCI
400 Support for Intel's IXP4XX (XScale) family of processors.
407 Say Y here if you intend to run this kernel on a LinkUp Systems
408 L7200 Software Development Board which uses an ARM720T processor.
409 Information on this board can be obtained at:
411 <http://www.linkupsys.com/>
413 If you have any questions or comments about the Linux kernel port
414 to this board, send e-mail to <sjhill@cotw.com>.
417 bool "Marvell Kirkwood"
421 select ARCH_REQUIRE_GPIOLIB
423 select GENERIC_CLOCKEVENTS
426 Support for the following Marvell Kirkwood series SoCs:
427 88F6180, 88F6192 and 88F6281.
430 bool "Marvell Loki (88RC8480)"
433 select GENERIC_CLOCKEVENTS
436 Support for the Marvell Loki (88RC8480) SoC.
439 bool "Marvell MV78xx0"
443 select ARCH_REQUIRE_GPIOLIB
445 select GENERIC_CLOCKEVENTS
448 Support for the following Marvell MV78xx0 series SoCs:
457 select ARCH_REQUIRE_GPIOLIB
459 select GENERIC_CLOCKEVENTS
462 Support for the following Marvell Orion 5x series SoCs:
463 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
464 Orion-2 (5281), Orion-1-90 (6183).
467 bool "Marvell PXA168/910"
470 select ARCH_REQUIRE_GPIOLIB
474 select GENERIC_CLOCKEVENTS
478 Support for Marvell's PXA168/910 processor line.
481 bool "Micrel/Kendin KS8695"
484 select ARCH_REQUIRE_GPIOLIB
486 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
487 System-on-Chip devices.
490 bool "NetSilicon NS9xxx"
494 select GENERIC_CLOCKEVENTS
497 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
500 <http://www.digi.com/products/microprocessors/index.jsp>
503 bool "Nuvoton W90X900 CPU"
505 select ARCH_REQUIRE_GPIOLIB
509 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
510 can login www.mcuos.com or www.nuvoton.com to know more.
513 bool "Philips Nexperia PNX4008 Mobile"
517 This enables support for Philips PNX4008 mobile platform.
520 bool "PXA2xx/PXA3xx-based"
523 select ARCH_HAS_CPUFREQ
527 select ARCH_REQUIRE_GPIOLIB
529 select GENERIC_CLOCKEVENTS
533 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
539 select GENERIC_CLOCKEVENTS
541 Support for Qualcomm MSM7K based systems. This runs on the ARM11
542 apps processor of the MSM7K and depends on a shared memory
543 interface to the ARM9 modem processor which runs the baseband stack
544 and controls some vital subsystems (clock and power control, etc).
551 select ARCH_MAY_HAVE_PC_FDC
552 select HAVE_PATA_PLATFORM
555 select ARCH_SPARSEMEM_ENABLE
557 On the Acorn Risc-PC, Linux can support the internal IDE disk and
558 CD-ROM interface, serial and parallel port, and the floppy drive.
564 select ARCH_SPARSEMEM_ENABLE
566 select ARCH_HAS_CPUFREQ
569 select GENERIC_CLOCKEVENTS
572 select ARCH_REQUIRE_GPIOLIB
574 Support for StrongARM 11x0 based boards.
577 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
579 select ARCH_HAS_CPUFREQ
582 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
583 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
584 the Samsung SMDK2410 development board (and derivatives).
587 bool "Samsung S3C64XX"
590 select ARCH_HAS_CPUFREQ
592 Samsung S3C64XX series based systems
595 bool "Samsung S5PC1XX"
600 Samsung S5PC1XX series based systems
610 Support for the StrongARM based Digital DNARD machine, also known
611 as "Shark" (<http://www.shark-linux.de/shark.html>).
616 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
617 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
619 Say Y here for systems based on one of the Sharp LH7A40X
620 System on a Chip processors. These CPUs include an ARM922T
621 core with a wide array of integrated devices for
622 hand-held and low-power applications.
625 bool "ST-Ericsson U300 Series"
631 select GENERIC_CLOCKEVENTS
636 Support for ST-Ericsson U300 series mobile platforms.
642 select GENERIC_CLOCKEVENTS
644 select ARCH_REQUIRE_GPIOLIB
649 select GENERIC_ALLOCATOR
651 Support for TI's DaVinci platform.
657 select ARCH_REQUIRE_GPIOLIB
658 select ARCH_HAS_CPUFREQ
660 select GENERIC_CLOCKEVENTS
662 Support for TI's OMAP platform (OMAP1 and OMAP2).
666 source "arch/arm/mach-clps711x/Kconfig"
668 source "arch/arm/mach-ep93xx/Kconfig"
670 source "arch/arm/mach-footbridge/Kconfig"
672 source "arch/arm/mach-gemini/Kconfig"
674 source "arch/arm/mach-integrator/Kconfig"
676 source "arch/arm/mach-iop32x/Kconfig"
678 source "arch/arm/mach-iop33x/Kconfig"
680 source "arch/arm/mach-iop13xx/Kconfig"
682 source "arch/arm/mach-ixp4xx/Kconfig"
684 source "arch/arm/mach-ixp2000/Kconfig"
686 source "arch/arm/mach-ixp23xx/Kconfig"
688 source "arch/arm/mach-loki/Kconfig"
690 source "arch/arm/mach-mv78xx0/Kconfig"
692 source "arch/arm/mach-pxa/Kconfig"
693 source "arch/arm/plat-pxa/Kconfig"
695 source "arch/arm/mach-mmp/Kconfig"
697 source "arch/arm/mach-sa1100/Kconfig"
699 source "arch/arm/plat-omap/Kconfig"
701 source "arch/arm/mach-omap1/Kconfig"
703 source "arch/arm/mach-omap2/Kconfig"
705 source "arch/arm/mach-orion5x/Kconfig"
707 source "arch/arm/mach-kirkwood/Kconfig"
709 source "arch/arm/plat-s3c24xx/Kconfig"
710 source "arch/arm/plat-s3c64xx/Kconfig"
711 source "arch/arm/plat-s3c/Kconfig"
712 source "arch/arm/plat-s5pc1xx/Kconfig"
715 source "arch/arm/mach-s3c2400/Kconfig"
716 source "arch/arm/mach-s3c2410/Kconfig"
717 source "arch/arm/mach-s3c2412/Kconfig"
718 source "arch/arm/mach-s3c2440/Kconfig"
719 source "arch/arm/mach-s3c2442/Kconfig"
720 source "arch/arm/mach-s3c2443/Kconfig"
724 source "arch/arm/mach-s3c6400/Kconfig"
725 source "arch/arm/mach-s3c6410/Kconfig"
728 source "arch/arm/plat-stmp3xxx/Kconfig"
731 source "arch/arm/mach-s5pc100/Kconfig"
734 source "arch/arm/mach-lh7a40x/Kconfig"
736 source "arch/arm/mach-h720x/Kconfig"
738 source "arch/arm/mach-versatile/Kconfig"
740 source "arch/arm/mach-aaec2000/Kconfig"
742 source "arch/arm/mach-realview/Kconfig"
744 source "arch/arm/mach-at91/Kconfig"
746 source "arch/arm/plat-mxc/Kconfig"
748 source "arch/arm/mach-netx/Kconfig"
750 source "arch/arm/mach-ns9xxx/Kconfig"
752 source "arch/arm/mach-davinci/Kconfig"
754 source "arch/arm/mach-ks8695/Kconfig"
756 source "arch/arm/mach-msm/Kconfig"
758 source "arch/arm/mach-u300/Kconfig"
760 source "arch/arm/mach-w90x900/Kconfig"
762 # Definitions to make life easier
775 source arch/arm/mm/Kconfig
778 bool "Enable iWMMXt support"
779 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
780 default y if PXA27x || PXA3xx || ARCH_MMP
782 Enable support for iWMMXt context switching at run time if
783 running on a CPU that supports it.
785 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
788 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
792 source "arch/arm/Kconfig-nommu"
795 config ARM_ERRATA_411920
796 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
797 depends on CPU_V6 && !SMP
799 Invalidation of the Instruction Cache operation can
800 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
801 It does not affect the MPCore. This option enables the ARM Ltd.
802 recommended workaround.
804 config ARM_ERRATA_430973
805 bool "ARM errata: Stale prediction on replaced interworking branch"
808 This option enables the workaround for the 430973 Cortex-A8
809 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
810 interworking branch is replaced with another code sequence at the
811 same virtual address, whether due to self-modifying code or virtual
812 to physical address re-mapping, Cortex-A8 does not recover from the
813 stale interworking branch prediction. This results in Cortex-A8
814 executing the new code sequence in the incorrect ARM or Thumb state.
815 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
816 and also flushes the branch target cache at every context switch.
817 Note that setting specific bits in the ACTLR register may not be
818 available in non-secure mode.
820 config ARM_ERRATA_458693
821 bool "ARM errata: Processor deadlock when a false hazard is created"
824 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
825 erratum. For very specific sequences of memory operations, it is
826 possible for a hazard condition intended for a cache line to instead
827 be incorrectly associated with a different cache line. This false
828 hazard might then cause a processor deadlock. The workaround enables
829 the L1 caching of the NEON accesses and disables the PLD instruction
830 in the ACTLR register. Note that setting specific bits in the ACTLR
831 register may not be available in non-secure mode.
833 config ARM_ERRATA_460075
834 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
837 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
838 erratum. Any asynchronous access to the L2 cache may encounter a
839 situation in which recent store transactions to the L2 cache are lost
840 and overwritten with stale memory contents from external memory. The
841 workaround disables the write-allocate mode for the L2 cache via the
842 ACTLR register. Note that setting specific bits in the ACTLR register
843 may not be available in non-secure mode.
847 source "arch/arm/common/Kconfig"
849 config FORCE_MAX_ZONEORDER
862 Find out whether you have ISA slots on your motherboard. ISA is the
863 name of a bus system, i.e. the way the CPU talks to the other stuff
864 inside your box. Other bus systems are PCI, EISA, MicroChannel
865 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
866 newer boards don't support it. If you have ISA, say Y, otherwise N.
868 # Select ISA DMA controller support
873 # Select ISA DMA interface
878 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
880 Find out whether you have a PCI motherboard. PCI is the name of a
881 bus system, i.e. the way the CPU talks to the other stuff inside
882 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
883 VESA. If you have PCI, say Y, otherwise N.
888 # Select the host bridge type
889 config PCI_HOST_VIA82C505
891 depends on PCI && ARCH_SHARK
894 config PCI_HOST_ITE8152
896 depends on PCI && MACH_ARMCORE
900 source "drivers/pci/Kconfig"
902 source "drivers/pcmcia/Kconfig"
906 menu "Kernel Features"
908 source "kernel/time/Kconfig"
911 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
912 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
913 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
914 depends on GENERIC_CLOCKEVENTS
915 select USE_GENERIC_SMP_HELPERS
916 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
918 This enables support for systems with more than one CPU. If you have
919 a system with only one CPU, like most personal computers, say N. If
920 you have a system with more than one CPU, say Y.
922 If you say N here, the kernel will run on single and multiprocessor
923 machines, but will use only one CPU of a multiprocessor machine. If
924 you say Y here, the kernel will run on many, but not all, single
925 processor machines. On a single processor machine, the kernel will
926 run faster if you say N here.
928 See also <file:Documentation/i386/IO-APIC.txt>,
929 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
930 <http://www.linuxdoc.org/docs.html#howto>.
932 If you don't know what to do here, say N.
938 This option enables support for the ARM system coherency unit
944 This options enables support for the ARM timer and watchdog unit
947 prompt "Memory split"
950 Select the desired split between kernel and user memory.
952 If you are not absolutely sure what you are doing, leave this
956 bool "3G/1G user/kernel split"
958 bool "2G/2G user/kernel split"
960 bool "1G/3G user/kernel split"
965 default 0x40000000 if VMSPLIT_1G
966 default 0x80000000 if VMSPLIT_2G
970 int "Maximum number of CPUs (2-32)"
976 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
977 depends on SMP && HOTPLUG && EXPERIMENTAL
979 Say Y here to experiment with turning CPUs off and on. CPUs
980 can be controlled through /sys/devices/system/cpu.
983 bool "Use local timer interrupts"
984 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
985 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
987 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
989 Enable support for local timers on SMP platforms, rather then the
990 legacy IPI broadcast method. Local timers allows the system
991 accounting to be spread across the timer interval, preventing a
992 "thundering herd" at every timer tick.
994 source kernel/Kconfig.preempt
998 default 128 if ARCH_L7200
999 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1000 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1001 default AT91_TIMER_HZ if ARCH_AT91
1004 config THUMB2_KERNEL
1005 bool "Compile the kernel in Thumb-2 mode"
1006 depends on CPU_V7 && EXPERIMENTAL
1008 select ARM_ASM_UNIFIED
1010 By enabling this option, the kernel will be compiled in
1011 Thumb-2 mode. A compiler/assembler that understand the unified
1012 ARM-Thumb syntax is needed.
1016 config ARM_ASM_UNIFIED
1020 bool "Use the ARM EABI to compile the kernel"
1022 This option allows for the kernel to be compiled using the latest
1023 ARM ABI (aka EABI). This is only useful if you are using a user
1024 space environment that is also compiled with EABI.
1026 Since there are major incompatibilities between the legacy ABI and
1027 EABI, especially with regard to structure member alignment, this
1028 option also changes the kernel syscall calling convention to
1029 disambiguate both ABIs and allow for backward compatibility support
1030 (selected with CONFIG_OABI_COMPAT).
1032 To use this you need GCC version 4.0.0 or later.
1035 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1036 depends on AEABI && EXPERIMENTAL
1039 This option preserves the old syscall interface along with the
1040 new (ARM EABI) one. It also provides a compatibility layer to
1041 intercept syscalls that have structure arguments which layout
1042 in memory differs between the legacy ABI and the new ARM EABI
1043 (only for non "thumb" binaries). This option adds a tiny
1044 overhead to all syscalls and produces a slightly larger kernel.
1045 If you know you'll be using only pure EABI user space then you
1046 can say N here. If this option is not selected and you attempt
1047 to execute a legacy ABI binary then the result will be
1048 UNPREDICTABLE (in fact it can be predicted that it won't work
1049 at all). If in doubt say Y.
1051 config ARCH_HAS_HOLES_MEMORYMODEL
1054 # Discontigmem is deprecated
1055 config ARCH_DISCONTIGMEM_ENABLE
1058 config ARCH_SPARSEMEM_ENABLE
1061 config ARCH_SPARSEMEM_DEFAULT
1062 def_bool ARCH_SPARSEMEM_ENABLE
1064 config ARCH_SELECT_MEMORY_MODEL
1065 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1069 default "4" if ARCH_LH7A40X
1071 depends on NEED_MULTIPLE_NODES
1074 bool "High Memory Support (EXPERIMENTAL)"
1075 depends on MMU && EXPERIMENTAL
1077 The address space of ARM processors is only 4 Gigabytes large
1078 and it has to accommodate user address space, kernel address
1079 space as well as some memory mapped IO. That means that, if you
1080 have a large amount of physical memory and/or IO, not all of the
1081 memory can be "permanently mapped" by the kernel. The physical
1082 memory that is not permanently mapped is called "high memory".
1084 Depending on the selected kernel/user memory split, minimum
1085 vmalloc space and actual amount of RAM, you may not need this
1086 option which should result in a slightly faster kernel.
1093 bool "Timer and CPU usage LEDs"
1094 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1095 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1096 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1097 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1098 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1099 ARCH_AT91 || ARCH_DAVINCI || \
1100 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1102 If you say Y here, the LEDs on your machine will be used
1103 to provide useful information about your current system status.
1105 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1106 be able to select which LEDs are active using the options below. If
1107 you are compiling a kernel for the EBSA-110 or the LART however, the
1108 red LED will simply flash regularly to indicate that the system is
1109 still functional. It is safe to say Y here if you have a CATS
1110 system, but the driver will do nothing.
1113 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1114 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1115 || MACH_OMAP_PERSEUS2
1117 depends on !GENERIC_CLOCKEVENTS
1118 default y if ARCH_EBSA110
1120 If you say Y here, one of the system LEDs (the green one on the
1121 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1122 will flash regularly to indicate that the system is still
1123 operational. This is mainly useful to kernel hackers who are
1124 debugging unstable kernels.
1126 The LART uses the same LED for both Timer LED and CPU usage LED
1127 functions. You may choose to use both, but the Timer LED function
1128 will overrule the CPU usage LED.
1131 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1133 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1134 || MACH_OMAP_PERSEUS2
1137 If you say Y here, the red LED will be used to give a good real
1138 time indication of CPU usage, by lighting whenever the idle task
1139 is not currently executing.
1141 The LART uses the same LED for both Timer LED and CPU usage LED
1142 functions. You may choose to use both, but the Timer LED function
1143 will overrule the CPU usage LED.
1145 config ALIGNMENT_TRAP
1147 depends on CPU_CP15_MMU
1148 default y if !ARCH_EBSA110
1150 ARM processors cannot fetch/store information which is not
1151 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1152 address divisible by 4. On 32-bit ARM processors, these non-aligned
1153 fetch/store instructions will be emulated in software if you say
1154 here, which has a severe performance impact. This is necessary for
1155 correct operation of some network protocols. With an IP-only
1156 configuration it is safe to say N, otherwise say Y.
1158 config UACCESS_WITH_MEMCPY
1159 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1160 depends on MMU && EXPERIMENTAL
1161 default y if CPU_FEROCEON
1163 Implement faster copy_to_user and clear_user methods for CPU
1164 cores where a 8-word STM instruction give significantly higher
1165 memory write throughput than a sequence of individual 32bit stores.
1167 A possible side effect is a slight increase in scheduling latency
1168 between threads sharing the same address space if they invoke
1169 such copy operations with large buffers.
1171 However, if the CPU data cache is using a write-allocate mode,
1172 this option is unlikely to provide any performance gain.
1178 # Compressed boot loader in ROM. Yes, we really want to ask about
1179 # TEXT and BSS so we preserve their values in the config files.
1180 config ZBOOT_ROM_TEXT
1181 hex "Compressed ROM boot loader base address"
1184 The physical address at which the ROM-able zImage is to be
1185 placed in the target. Platforms which normally make use of
1186 ROM-able zImage formats normally set this to a suitable
1187 value in their defconfig file.
1189 If ZBOOT_ROM is not enabled, this has no effect.
1191 config ZBOOT_ROM_BSS
1192 hex "Compressed ROM boot loader BSS address"
1195 The base address of an area of read/write memory in the target
1196 for the ROM-able zImage which must be available while the
1197 decompressor is running. It must be large enough to hold the
1198 entire decompressed kernel plus an additional 128 KiB.
1199 Platforms which normally make use of ROM-able zImage formats
1200 normally set this to a suitable value in their defconfig file.
1202 If ZBOOT_ROM is not enabled, this has no effect.
1205 bool "Compressed boot loader in ROM/flash"
1206 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1208 Say Y here if you intend to execute your compressed kernel image
1209 (zImage) directly from ROM or flash. If unsure, say N.
1212 string "Default kernel command string"
1215 On some architectures (EBSA110 and CATS), there is currently no way
1216 for the boot loader to pass arguments to the kernel. For these
1217 architectures, you should supply some command-line options at build
1218 time by entering them here. As a minimum, you should specify the
1219 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1222 bool "Kernel Execute-In-Place from ROM"
1223 depends on !ZBOOT_ROM
1225 Execute-In-Place allows the kernel to run from non-volatile storage
1226 directly addressable by the CPU, such as NOR flash. This saves RAM
1227 space since the text section of the kernel is not loaded from flash
1228 to RAM. Read-write sections, such as the data section and stack,
1229 are still copied to RAM. The XIP kernel is not compressed since
1230 it has to run directly from flash, so it will take more space to
1231 store it. The flash address used to link the kernel object files,
1232 and for storing it, is configuration dependent. Therefore, if you
1233 say Y here, you must know the proper physical address where to
1234 store the kernel image depending on your own flash memory usage.
1236 Also note that the make target becomes "make xipImage" rather than
1237 "make zImage" or "make Image". The final kernel binary to put in
1238 ROM memory will be arch/arm/boot/xipImage.
1242 config XIP_PHYS_ADDR
1243 hex "XIP Kernel Physical Location"
1244 depends on XIP_KERNEL
1245 default "0x00080000"
1247 This is the physical address in your flash memory the kernel will
1248 be linked for and stored to. This address is dependent on your
1252 bool "Kexec system call (EXPERIMENTAL)"
1253 depends on EXPERIMENTAL
1255 kexec is a system call that implements the ability to shutdown your
1256 current kernel, and to start another kernel. It is like a reboot
1257 but it is independent of the system firmware. And like a reboot
1258 you can start any kernel with it, not just Linux.
1260 It is an ongoing process to be certain the hardware in a machine
1261 is properly shutdown, so do not be surprised if this code does not
1262 initially work for you. It may help to enable device hotplugging
1266 bool "Export atags in procfs"
1270 Should the atags used to boot the kernel be exported in an "atags"
1271 file in procfs. Useful with kexec.
1275 menu "CPU Power Management"
1279 source "drivers/cpufreq/Kconfig"
1281 config CPU_FREQ_SA1100
1283 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1286 config CPU_FREQ_SA1110
1288 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1291 config CPU_FREQ_INTEGRATOR
1292 tristate "CPUfreq driver for ARM Integrator CPUs"
1293 depends on ARCH_INTEGRATOR && CPU_FREQ
1296 This enables the CPUfreq driver for ARM Integrator CPUs.
1298 For details, take a look at <file:Documentation/cpu-freq>.
1304 depends on CPU_FREQ && ARCH_PXA && PXA25x
1306 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1308 config CPU_FREQ_S3C64XX
1309 bool "CPUfreq support for Samsung S3C64XX CPUs"
1310 depends on CPU_FREQ && CPU_S3C6410
1315 Internal configuration node for common cpufreq on Samsung SoC
1317 config CPU_FREQ_S3C24XX
1318 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1319 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1322 This enables the CPUfreq driver for the Samsung S3C24XX family
1325 For details, take a look at <file:Documentation/cpu-freq>.
1329 config CPU_FREQ_S3C24XX_PLL
1330 bool "Support CPUfreq changing of PLL frequency"
1331 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1333 Compile in support for changing the PLL frequency from the
1334 S3C24XX series CPUfreq driver. The PLL takes time to settle
1335 after a frequency change, so by default it is not enabled.
1337 This also means that the PLL tables for the selected CPU(s) will
1338 be built which may increase the size of the kernel image.
1340 config CPU_FREQ_S3C24XX_DEBUG
1341 bool "Debug CPUfreq Samsung driver core"
1342 depends on CPU_FREQ_S3C24XX
1344 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1346 config CPU_FREQ_S3C24XX_IODEBUG
1347 bool "Debug CPUfreq Samsung driver IO timing"
1348 depends on CPU_FREQ_S3C24XX
1350 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1352 config CPU_FREQ_S3C24XX_DEBUGFS
1353 bool "Export debugfs for CPUFreq"
1354 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1356 Export status information via debugfs.
1360 source "drivers/cpuidle/Kconfig"
1364 menu "Floating point emulation"
1366 comment "At least one emulation must be selected"
1369 bool "NWFPE math emulation"
1370 depends on !AEABI || OABI_COMPAT
1372 Say Y to include the NWFPE floating point emulator in the kernel.
1373 This is necessary to run most binaries. Linux does not currently
1374 support floating point hardware so you need to say Y here even if
1375 your machine has an FPA or floating point co-processor podule.
1377 You may say N here if you are going to load the Acorn FPEmulator
1378 early in the bootup.
1381 bool "Support extended precision"
1382 depends on FPE_NWFPE
1384 Say Y to include 80-bit support in the kernel floating-point
1385 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1386 Note that gcc does not generate 80-bit operations by default,
1387 so in most cases this option only enlarges the size of the
1388 floating point emulator without any good reason.
1390 You almost surely want to say N here.
1393 bool "FastFPE math emulation (EXPERIMENTAL)"
1394 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1396 Say Y here to include the FAST floating point emulator in the kernel.
1397 This is an experimental much faster emulator which now also has full
1398 precision for the mantissa. It does not support any exceptions.
1399 It is very simple, and approximately 3-6 times faster than NWFPE.
1401 It should be sufficient for most programs. It may be not suitable
1402 for scientific calculations, but you have to check this for yourself.
1403 If you do not feel you need a faster FP emulation you should better
1407 bool "VFP-format floating point maths"
1408 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1410 Say Y to include VFP support code in the kernel. This is needed
1411 if your hardware includes a VFP unit.
1413 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1414 release notes and additional status information.
1416 Say N if your target does not have VFP hardware.
1424 bool "Advanced SIMD (NEON) Extension support"
1425 depends on VFPv3 && CPU_V7
1427 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1432 menu "Userspace binary formats"
1434 source "fs/Kconfig.binfmt"
1437 tristate "RISC OS personality"
1440 Say Y here to include the kernel code necessary if you want to run
1441 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1442 experimental; if this sounds frightening, say N and sleep in peace.
1443 You can also say M here to compile this support as a module (which
1444 will be called arthur).
1448 menu "Power management options"
1450 source "kernel/power/Kconfig"
1452 config ARCH_SUSPEND_POSSIBLE
1457 source "net/Kconfig"
1459 source "drivers/Kconfig"
1463 source "arch/arm/Kconfig.debug"
1465 source "security/Kconfig"
1467 source "crypto/Kconfig"
1469 source "lib/Kconfig"