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
35 config HAVE_SCHED_CLOCK
44 config GENERIC_CLOCKEVENTS
47 config GENERIC_CLOCKEVENTS_BROADCAST
49 depends on GENERIC_CLOCKEVENTS
50 default y if SMP && !LOCAL_TIMERS
54 select GENERIC_ALLOCATOR
62 The Extended Industry Standard Architecture (EISA) bus was
63 developed as an open alternative to the IBM MicroChannel bus.
65 The EISA bus provided some of the features of the IBM MicroChannel
66 bus while maintaining backward compatibility with cards made for
67 the older ISA bus. The EISA bus saw limited use between 1988 and
68 1995 when it was made obsolete by the PCI bus.
70 Say Y here if you are building a kernel for an EISA-based machine.
80 MicroChannel Architecture is found in some IBM PS/2 machines and
81 laptops. It is a bus system similar to PCI or ISA. See
82 <file:Documentation/mca.txt> (and especially the web page given
83 there) before attempting to build an MCA bus kernel.
85 config GENERIC_HARDIRQS
89 config STACKTRACE_SUPPORT
93 config HAVE_LATENCYTOP_SUPPORT
98 config LOCKDEP_SUPPORT
102 config TRACE_IRQFLAGS_SUPPORT
106 config HARDIRQS_SW_RESEND
110 config GENERIC_IRQ_PROBE
114 config GENERIC_LOCKBREAK
117 depends on SMP && PREEMPT
119 config RWSEM_GENERIC_SPINLOCK
123 config RWSEM_XCHGADD_ALGORITHM
126 config ARCH_HAS_ILOG2_U32
129 config ARCH_HAS_ILOG2_U64
132 config ARCH_HAS_CPUFREQ
135 Internal node to signify that the ARCH has CPUFREQ support
136 and that the relevant menu configurations are displayed for
139 config GENERIC_HWEIGHT
143 config GENERIC_CALIBRATE_DELAY
147 config ARCH_MAY_HAVE_PC_FDC
153 config GENERIC_ISA_DMA
162 config GENERIC_HARDIRQS_NO__DO_IRQ
167 config OPROFILE_ARMV6
169 depends on CPU_V6 && !SMP
170 select OPROFILE_ARM11_CORE
172 config OPROFILE_MPCORE
174 depends on CPU_V6 && SMP
175 select OPROFILE_ARM11_CORE
177 config OPROFILE_ARM11_CORE
180 config OPROFILE_ARMV7
182 depends on CPU_V7 && !SMP
189 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
190 default DRAM_BASE if REMAP_VECTORS_TO_RAM
193 The base address of exception vectors.
195 source "init/Kconfig"
197 source "kernel/Kconfig.freezer"
202 bool "MMU-based Paged Memory Management Support"
205 Select if you want MMU-based virtualised addressing space
206 support by paged memory management. If unsure, say 'Y'.
209 prompt "ARM system type"
210 default ARCH_VERSATILE
213 bool "Agilent AAEC-2000 based"
218 This enables support for systems based on the Agilent AAEC-2000
220 config ARCH_INTEGRATOR
221 bool "ARM Ltd. Integrator family"
223 select ARCH_HAS_CPUFREQ
228 Support for ARM's Integrator platform.
231 bool "ARM Ltd. RealView family"
237 select GENERIC_CLOCKEVENTS
238 select ARCH_WANT_OPTIONAL_GPIOLIB
240 This enables support for ARM Ltd RealView boards.
242 config ARCH_VERSATILE
243 bool "ARM Ltd. Versatile family"
250 select GENERIC_CLOCKEVENTS
251 select ARCH_WANT_OPTIONAL_GPIOLIB
253 This enables support for ARM Ltd Versatile board.
258 select ARCH_REQUIRE_GPIOLIB
261 This enables support for systems based on the Atmel AT91RM9200,
262 AT91SAM9 and AT91CAP9 processors.
265 bool "Cirrus Logic CLPS711x/EP721x-based"
268 Support for Cirrus Logic 711x/721x based boards.
271 bool "Cortina Systems Gemini"
274 select ARCH_REQUIRE_GPIOLIB
276 Support for the Cortina Systems Gemini family SoCs
284 This is an evaluation board for the StrongARM processor available
285 from Digital. It has limited hardware on-board, including an
286 Ethernet interface, two PCMCIA sockets, two serial ports and a
297 select ARCH_REQUIRE_GPIOLIB
298 select ARCH_HAS_HOLES_MEMORYMODEL
300 This enables support for the Cirrus EP93xx series of CPUs.
302 config ARCH_FOOTBRIDGE
307 Support for systems based on the DC21285 companion chip
308 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
311 bool "Freescale MXC/iMX-based"
313 select GENERIC_CLOCKEVENTS
316 select ARCH_REQUIRE_GPIOLIB
319 Support for Freescale MXC/iMX-based family of processors
322 bool "Freescale STMP3xxx"
326 select ARCH_REQUIRE_GPIOLIB
328 select GENERIC_CLOCKEVENTS
330 select USB_ARCH_HAS_EHCI
332 Support for systems based on the Freescale 3xxx CPUs.
335 bool "Hilscher NetX based"
338 select GENERIC_CLOCKEVENTS
341 This enables support for systems based on the Hilscher NetX Soc
344 bool "Hynix HMS720x-based"
348 This enables support for systems based on the Hynix HMS720x
351 bool "STMicroelectronics Nomadik"
358 select GENERIC_CLOCKEVENTS
360 select ARCH_REQUIRE_GPIOLIB
362 Support for the Nomadik platform by ST-Ericsson
370 select ARCH_SUPPORTS_MSI
373 Support for Intel's IOP13XX (XScale) family of processors.
382 select ARCH_REQUIRE_GPIOLIB
384 Support for Intel's 80219 and IOP32X (XScale) family of
394 select ARCH_REQUIRE_GPIOLIB
396 Support for Intel's IOP33X (XScale) family of processors.
404 Support for Intel's IXP23xx (XScale) family of processors.
407 bool "IXP2400/2800-based"
412 Support for Intel's IXP2400/2800 (XScale) family of processors.
420 select GENERIC_CLOCKEVENTS
421 select DMABOUNCE if PCI
423 Support for Intel's IXP4XX (XScale) family of processors.
430 Say Y here if you intend to run this kernel on a LinkUp Systems
431 L7200 Software Development Board which uses an ARM720T processor.
432 Information on this board can be obtained at:
434 <http://www.linkupsys.com/>
436 If you have any questions or comments about the Linux kernel port
437 to this board, send e-mail to <sjhill@cotw.com>.
440 bool "Marvell Kirkwood"
444 select ARCH_REQUIRE_GPIOLIB
446 select GENERIC_CLOCKEVENTS
449 Support for the following Marvell Kirkwood series SoCs:
450 88F6180, 88F6192 and 88F6281.
453 bool "Marvell Loki (88RC8480)"
456 select GENERIC_CLOCKEVENTS
459 Support for the Marvell Loki (88RC8480) SoC.
462 bool "Marvell MV78xx0"
466 select ARCH_REQUIRE_GPIOLIB
468 select GENERIC_CLOCKEVENTS
471 Support for the following Marvell MV78xx0 series SoCs:
480 select ARCH_REQUIRE_GPIOLIB
482 select GENERIC_CLOCKEVENTS
485 Support for the following Marvell Orion 5x series SoCs:
486 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
487 Orion-2 (5281), Orion-1-90 (6183).
490 bool "Marvell PXA168/910"
493 select ARCH_REQUIRE_GPIOLIB
497 select GENERIC_CLOCKEVENTS
501 Support for Marvell's PXA168/910 processor line.
504 bool "Micrel/Kendin KS8695"
507 select ARCH_REQUIRE_GPIOLIB
509 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
510 System-on-Chip devices.
513 bool "NetSilicon NS9xxx"
517 select GENERIC_CLOCKEVENTS
520 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
523 <http://www.digi.com/products/microprocessors/index.jsp>
526 bool "Nuvoton W90X900 CPU"
528 select ARCH_REQUIRE_GPIOLIB
533 select GENERIC_CLOCKEVENTS
535 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
536 At present, the w90x900 has been renamed nuc900, regarding
537 the ARM series product line, you can login the following
538 link address to know more.
540 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
541 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
544 bool "Philips Nexperia PNX4008 Mobile"
548 This enables support for Philips PNX4008 mobile platform.
551 bool "PXA2xx/PXA3xx-based"
554 select ARCH_HAS_CPUFREQ
558 select ARCH_REQUIRE_GPIOLIB
560 select GENERIC_CLOCKEVENTS
564 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
570 select GENERIC_CLOCKEVENTS
572 Support for Qualcomm MSM7K based systems. This runs on the ARM11
573 apps processor of the MSM7K and depends on a shared memory
574 interface to the ARM9 modem processor which runs the baseband stack
575 and controls some vital subsystems (clock and power control, etc).
582 select ARCH_MAY_HAVE_PC_FDC
583 select HAVE_PATA_PLATFORM
586 select ARCH_SPARSEMEM_ENABLE
588 On the Acorn Risc-PC, Linux can support the internal IDE disk and
589 CD-ROM interface, serial and parallel port, and the floppy drive.
595 select ARCH_SPARSEMEM_ENABLE
597 select ARCH_HAS_CPUFREQ
600 select GENERIC_CLOCKEVENTS
603 select ARCH_REQUIRE_GPIOLIB
605 Support for StrongARM 11x0 based boards.
608 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
610 select ARCH_HAS_CPUFREQ
613 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
614 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
615 the Samsung SMDK2410 development board (and derivatives).
618 bool "Samsung S3C64XX"
621 select ARCH_HAS_CPUFREQ
623 Samsung S3C64XX series based systems
626 bool "Samsung S5PC1XX"
631 Samsung S5PC1XX series based systems
641 Support for the StrongARM based Digital DNARD machine, also known
642 as "Shark" (<http://www.shark-linux.de/shark.html>).
647 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
648 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
650 Say Y here for systems based on one of the Sharp LH7A40X
651 System on a Chip processors. These CPUs include an ARM922T
652 core with a wide array of integrated devices for
653 hand-held and low-power applications.
656 bool "ST-Ericsson U300 Series"
663 select GENERIC_CLOCKEVENTS
668 Support for ST-Ericsson U300 series mobile platforms.
674 select GENERIC_CLOCKEVENTS
676 select ARCH_REQUIRE_GPIOLIB
681 select GENERIC_ALLOCATOR
683 Support for TI's DaVinci platform.
689 select ARCH_REQUIRE_GPIOLIB
690 select ARCH_HAS_CPUFREQ
692 select GENERIC_CLOCKEVENTS
694 Support for TI's OMAP platform (OMAP1 and OMAP2).
697 bool "Broadcom BCMRING"
703 select GENERIC_CLOCKEVENTS
704 select ARCH_WANT_OPTIONAL_GPIOLIB
706 Support for Broadcom's BCMRing platform.
709 bool "Rockchip soc rk2818"
715 select ARCH_HAS_CPUFREQ
717 select GENERIC_CLOCKEVENTS
718 select ARCH_REQUIRE_GPIOLIB
720 Support for Rockchip RK2818 soc.
723 bool "Rockchip Soc Rk29"
727 select HAVE_SCHED_CLOCK
728 select ARCH_HAS_CPUFREQ
730 select GENERIC_CLOCKEVENTS
731 select ARCH_REQUIRE_GPIOLIB
737 Support for Rockchip RK29 soc.
741 source "arch/arm/mach-clps711x/Kconfig"
743 source "arch/arm/mach-ep93xx/Kconfig"
745 source "arch/arm/mach-footbridge/Kconfig"
747 source "arch/arm/mach-gemini/Kconfig"
749 source "arch/arm/mach-integrator/Kconfig"
751 source "arch/arm/mach-iop32x/Kconfig"
753 source "arch/arm/mach-iop33x/Kconfig"
755 source "arch/arm/mach-iop13xx/Kconfig"
757 source "arch/arm/mach-ixp4xx/Kconfig"
759 source "arch/arm/mach-ixp2000/Kconfig"
761 source "arch/arm/mach-ixp23xx/Kconfig"
763 source "arch/arm/mach-loki/Kconfig"
765 source "arch/arm/mach-mv78xx0/Kconfig"
767 source "arch/arm/mach-pxa/Kconfig"
768 source "arch/arm/plat-pxa/Kconfig"
770 source "arch/arm/mach-mmp/Kconfig"
772 source "arch/arm/mach-sa1100/Kconfig"
774 source "arch/arm/plat-omap/Kconfig"
776 source "arch/arm/mach-omap1/Kconfig"
778 source "arch/arm/mach-omap2/Kconfig"
780 source "arch/arm/mach-orion5x/Kconfig"
782 source "arch/arm/mach-kirkwood/Kconfig"
784 source "arch/arm/plat-s3c24xx/Kconfig"
785 source "arch/arm/plat-s3c64xx/Kconfig"
786 source "arch/arm/plat-s3c/Kconfig"
787 source "arch/arm/plat-s5pc1xx/Kconfig"
790 source "arch/arm/mach-s3c2400/Kconfig"
791 source "arch/arm/mach-s3c2410/Kconfig"
792 source "arch/arm/mach-s3c2412/Kconfig"
793 source "arch/arm/mach-s3c2440/Kconfig"
794 source "arch/arm/mach-s3c2442/Kconfig"
795 source "arch/arm/mach-s3c2443/Kconfig"
799 source "arch/arm/mach-s3c6400/Kconfig"
800 source "arch/arm/mach-s3c6410/Kconfig"
803 source "arch/arm/plat-stmp3xxx/Kconfig"
806 source "arch/arm/mach-s5pc100/Kconfig"
809 source "arch/arm/mach-lh7a40x/Kconfig"
811 source "arch/arm/mach-h720x/Kconfig"
813 source "arch/arm/mach-versatile/Kconfig"
815 source "arch/arm/mach-aaec2000/Kconfig"
817 source "arch/arm/mach-realview/Kconfig"
819 source "arch/arm/mach-at91/Kconfig"
821 source "arch/arm/plat-mxc/Kconfig"
823 source "arch/arm/mach-nomadik/Kconfig"
825 source "arch/arm/mach-netx/Kconfig"
827 source "arch/arm/mach-ns9xxx/Kconfig"
829 source "arch/arm/mach-davinci/Kconfig"
831 source "arch/arm/mach-ks8695/Kconfig"
833 source "arch/arm/mach-msm/Kconfig"
835 source "arch/arm/mach-u300/Kconfig"
837 source "arch/arm/mach-w90x900/Kconfig"
839 source "arch/arm/mach-bcmring/Kconfig"
841 source "arch/arm/mach-rk2818/Kconfig"
843 source "arch/arm/mach-rk29/Kconfig"
845 # Definitions to make life easier
858 source arch/arm/mm/Kconfig
861 bool "Enable iWMMXt support"
862 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
863 default y if PXA27x || PXA3xx || ARCH_MMP
865 Enable support for iWMMXt context switching at run time if
866 running on a CPU that supports it.
868 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
871 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
875 source "arch/arm/Kconfig-nommu"
878 config ARM_ERRATA_411920
879 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
880 depends on CPU_V6 && !SMP
882 Invalidation of the Instruction Cache operation can
883 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
884 It does not affect the MPCore. This option enables the ARM Ltd.
885 recommended workaround.
887 config ARM_ERRATA_430973
888 bool "ARM errata: Stale prediction on replaced interworking branch"
891 This option enables the workaround for the 430973 Cortex-A8
892 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
893 interworking branch is replaced with another code sequence at the
894 same virtual address, whether due to self-modifying code or virtual
895 to physical address re-mapping, Cortex-A8 does not recover from the
896 stale interworking branch prediction. This results in Cortex-A8
897 executing the new code sequence in the incorrect ARM or Thumb state.
898 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
899 and also flushes the branch target cache at every context switch.
900 Note that setting specific bits in the ACTLR register may not be
901 available in non-secure mode.
903 config ARM_ERRATA_458693
904 bool "ARM errata: Processor deadlock when a false hazard is created"
907 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
908 erratum. For very specific sequences of memory operations, it is
909 possible for a hazard condition intended for a cache line to instead
910 be incorrectly associated with a different cache line. This false
911 hazard might then cause a processor deadlock. The workaround enables
912 the L1 caching of the NEON accesses and disables the PLD instruction
913 in the ACTLR register. Note that setting specific bits in the ACTLR
914 register may not be available in non-secure mode.
916 config ARM_ERRATA_460075
917 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
920 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
921 erratum. Any asynchronous access to the L2 cache may encounter a
922 situation in which recent store transactions to the L2 cache are lost
923 and overwritten with stale memory contents from external memory. The
924 workaround disables the write-allocate mode for the L2 cache via the
925 ACTLR register. Note that setting specific bits in the ACTLR register
926 may not be available in non-secure mode.
928 config ARM_ERRATA_720789
929 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
930 depends on CPU_V7 && SMP
932 This option enables the workaround for the 720789 Cortex-A9 (prior to
933 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
934 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
935 As a consequence of this erratum, some TLB entries which should be
936 invalidated are not, resulting in an incoherency in the system page
937 tables. The workaround changes the TLB flushing routines to invalidate
938 entries regardless of the ASID.
942 source "arch/arm/common/Kconfig"
944 config FORCE_MAX_ZONEORDER
957 Find out whether you have ISA slots on your motherboard. ISA is the
958 name of a bus system, i.e. the way the CPU talks to the other stuff
959 inside your box. Other bus systems are PCI, EISA, MicroChannel
960 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
961 newer boards don't support it. If you have ISA, say Y, otherwise N.
963 # Select ISA DMA controller support
968 # Select ISA DMA interface
973 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
975 Find out whether you have a PCI motherboard. PCI is the name of a
976 bus system, i.e. the way the CPU talks to the other stuff inside
977 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
978 VESA. If you have PCI, say Y, otherwise N.
983 # Select the host bridge type
984 config PCI_HOST_VIA82C505
986 depends on PCI && ARCH_SHARK
989 config PCI_HOST_ITE8152
991 depends on PCI && MACH_ARMCORE
995 source "drivers/pci/Kconfig"
997 source "drivers/pcmcia/Kconfig"
1001 menu "Kernel Features"
1003 source "kernel/time/Kconfig"
1006 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1007 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1008 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1009 depends on GENERIC_CLOCKEVENTS
1010 select USE_GENERIC_SMP_HELPERS
1011 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
1013 This enables support for systems with more than one CPU. If you have
1014 a system with only one CPU, like most personal computers, say N. If
1015 you have a system with more than one CPU, say Y.
1017 If you say N here, the kernel will run on single and multiprocessor
1018 machines, but will use only one CPU of a multiprocessor machine. If
1019 you say Y here, the kernel will run on many, but not all, single
1020 processor machines. On a single processor machine, the kernel will
1021 run faster if you say N here.
1023 See also <file:Documentation/i386/IO-APIC.txt>,
1024 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1025 <http://www.linuxdoc.org/docs.html#howto>.
1027 If you don't know what to do here, say N.
1033 This option enables support for the ARM system coherency unit
1039 This options enables support for the ARM timer and watchdog unit
1042 prompt "Memory split"
1045 Select the desired split between kernel and user memory.
1047 If you are not absolutely sure what you are doing, leave this
1051 bool "3G/1G user/kernel split"
1053 bool "2G/2G user/kernel split"
1055 bool "1G/3G user/kernel split"
1060 default 0x40000000 if VMSPLIT_1G
1061 default 0x80000000 if VMSPLIT_2G
1065 int "Maximum number of CPUs (2-32)"
1071 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1072 depends on SMP && HOTPLUG && EXPERIMENTAL
1074 Say Y here to experiment with turning CPUs off and on. CPUs
1075 can be controlled through /sys/devices/system/cpu.
1078 bool "Use local timer interrupts"
1079 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1080 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1082 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
1084 Enable support for local timers on SMP platforms, rather then the
1085 legacy IPI broadcast method. Local timers allows the system
1086 accounting to be spread across the timer interval, preventing a
1087 "thundering herd" at every timer tick.
1089 source kernel/Kconfig.preempt
1093 default 128 if ARCH_L7200
1094 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1095 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1096 default AT91_TIMER_HZ if ARCH_AT91
1099 config THUMB2_KERNEL
1100 bool "Compile the kernel in Thumb-2 mode"
1101 depends on CPU_V7 && EXPERIMENTAL
1103 select ARM_ASM_UNIFIED
1105 By enabling this option, the kernel will be compiled in
1106 Thumb-2 mode. A compiler/assembler that understand the unified
1107 ARM-Thumb syntax is needed.
1111 config ARM_ASM_UNIFIED
1115 bool "Use the ARM EABI to compile the kernel"
1117 This option allows for the kernel to be compiled using the latest
1118 ARM ABI (aka EABI). This is only useful if you are using a user
1119 space environment that is also compiled with EABI.
1121 Since there are major incompatibilities between the legacy ABI and
1122 EABI, especially with regard to structure member alignment, this
1123 option also changes the kernel syscall calling convention to
1124 disambiguate both ABIs and allow for backward compatibility support
1125 (selected with CONFIG_OABI_COMPAT).
1127 To use this you need GCC version 4.0.0 or later.
1130 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1131 depends on AEABI && EXPERIMENTAL
1134 This option preserves the old syscall interface along with the
1135 new (ARM EABI) one. It also provides a compatibility layer to
1136 intercept syscalls that have structure arguments which layout
1137 in memory differs between the legacy ABI and the new ARM EABI
1138 (only for non "thumb" binaries). This option adds a tiny
1139 overhead to all syscalls and produces a slightly larger kernel.
1140 If you know you'll be using only pure EABI user space then you
1141 can say N here. If this option is not selected and you attempt
1142 to execute a legacy ABI binary then the result will be
1143 UNPREDICTABLE (in fact it can be predicted that it won't work
1144 at all). If in doubt say Y.
1146 config ARCH_HAS_HOLES_MEMORYMODEL
1149 # Discontigmem is deprecated
1150 config ARCH_DISCONTIGMEM_ENABLE
1153 config ARCH_SPARSEMEM_ENABLE
1156 config ARCH_SPARSEMEM_DEFAULT
1157 def_bool ARCH_SPARSEMEM_ENABLE
1159 config ARCH_SELECT_MEMORY_MODEL
1160 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1164 default "4" if ARCH_LH7A40X
1166 depends on NEED_MULTIPLE_NODES
1169 bool "High Memory Support (EXPERIMENTAL)"
1170 depends on MMU && EXPERIMENTAL
1172 The address space of ARM processors is only 4 Gigabytes large
1173 and it has to accommodate user address space, kernel address
1174 space as well as some memory mapped IO. That means that, if you
1175 have a large amount of physical memory and/or IO, not all of the
1176 memory can be "permanently mapped" by the kernel. The physical
1177 memory that is not permanently mapped is called "high memory".
1179 Depending on the selected kernel/user memory split, minimum
1180 vmalloc space and actual amount of RAM, you may not need this
1181 option which should result in a slightly faster kernel.
1186 bool "Allocate 2nd-level pagetables from highmem"
1188 depends on !OUTER_CACHE
1193 bool "Timer and CPU usage LEDs"
1194 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1195 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1196 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1197 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1198 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1199 ARCH_AT91 || ARCH_DAVINCI || \
1200 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1202 If you say Y here, the LEDs on your machine will be used
1203 to provide useful information about your current system status.
1205 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1206 be able to select which LEDs are active using the options below. If
1207 you are compiling a kernel for the EBSA-110 or the LART however, the
1208 red LED will simply flash regularly to indicate that the system is
1209 still functional. It is safe to say Y here if you have a CATS
1210 system, but the driver will do nothing.
1213 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1214 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1215 || MACH_OMAP_PERSEUS2
1217 depends on !GENERIC_CLOCKEVENTS
1218 default y if ARCH_EBSA110
1220 If you say Y here, one of the system LEDs (the green one on the
1221 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1222 will flash regularly to indicate that the system is still
1223 operational. This is mainly useful to kernel hackers who are
1224 debugging unstable kernels.
1226 The LART uses the same LED for both Timer LED and CPU usage LED
1227 functions. You may choose to use both, but the Timer LED function
1228 will overrule the CPU usage LED.
1231 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1233 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1234 || MACH_OMAP_PERSEUS2
1237 If you say Y here, the red LED will be used to give a good real
1238 time indication of CPU usage, by lighting whenever the idle task
1239 is not currently executing.
1241 The LART uses the same LED for both Timer LED and CPU usage LED
1242 functions. You may choose to use both, but the Timer LED function
1243 will overrule the CPU usage LED.
1245 config ALIGNMENT_TRAP
1247 depends on CPU_CP15_MMU
1248 default y if !ARCH_EBSA110
1250 ARM processors cannot fetch/store information which is not
1251 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1252 address divisible by 4. On 32-bit ARM processors, these non-aligned
1253 fetch/store instructions will be emulated in software if you say
1254 here, which has a severe performance impact. This is necessary for
1255 correct operation of some network protocols. With an IP-only
1256 configuration it is safe to say N, otherwise say Y.
1258 config UACCESS_WITH_MEMCPY
1259 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1260 depends on MMU && EXPERIMENTAL
1261 default y if CPU_FEROCEON
1263 Implement faster copy_to_user and clear_user methods for CPU
1264 cores where a 8-word STM instruction give significantly higher
1265 memory write throughput than a sequence of individual 32bit stores.
1267 A possible side effect is a slight increase in scheduling latency
1268 between threads sharing the same address space if they invoke
1269 such copy operations with large buffers.
1271 However, if the CPU data cache is using a write-allocate mode,
1272 this option is unlikely to provide any performance gain.
1278 # Compressed boot loader in ROM. Yes, we really want to ask about
1279 # TEXT and BSS so we preserve their values in the config files.
1280 config ZBOOT_ROM_TEXT
1281 hex "Compressed ROM boot loader base address"
1284 The physical address at which the ROM-able zImage is to be
1285 placed in the target. Platforms which normally make use of
1286 ROM-able zImage formats normally set this to a suitable
1287 value in their defconfig file.
1289 If ZBOOT_ROM is not enabled, this has no effect.
1291 config ZBOOT_ROM_BSS
1292 hex "Compressed ROM boot loader BSS address"
1295 The base address of an area of read/write memory in the target
1296 for the ROM-able zImage which must be available while the
1297 decompressor is running. It must be large enough to hold the
1298 entire decompressed kernel plus an additional 128 KiB.
1299 Platforms which normally make use of ROM-able zImage formats
1300 normally set this to a suitable value in their defconfig file.
1302 If ZBOOT_ROM is not enabled, this has no effect.
1305 bool "Compressed boot loader in ROM/flash"
1306 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1308 Say Y here if you intend to execute your compressed kernel image
1309 (zImage) directly from ROM or flash. If unsure, say N.
1312 string "Default kernel command string"
1315 On some architectures (EBSA110 and CATS), there is currently no way
1316 for the boot loader to pass arguments to the kernel. For these
1317 architectures, you should supply some command-line options at build
1318 time by entering them here. As a minimum, you should specify the
1319 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1322 bool "Kernel Execute-In-Place from ROM"
1323 depends on !ZBOOT_ROM
1325 Execute-In-Place allows the kernel to run from non-volatile storage
1326 directly addressable by the CPU, such as NOR flash. This saves RAM
1327 space since the text section of the kernel is not loaded from flash
1328 to RAM. Read-write sections, such as the data section and stack,
1329 are still copied to RAM. The XIP kernel is not compressed since
1330 it has to run directly from flash, so it will take more space to
1331 store it. The flash address used to link the kernel object files,
1332 and for storing it, is configuration dependent. Therefore, if you
1333 say Y here, you must know the proper physical address where to
1334 store the kernel image depending on your own flash memory usage.
1336 Also note that the make target becomes "make xipImage" rather than
1337 "make zImage" or "make Image". The final kernel binary to put in
1338 ROM memory will be arch/arm/boot/xipImage.
1342 config XIP_PHYS_ADDR
1343 hex "XIP Kernel Physical Location"
1344 depends on XIP_KERNEL
1345 default "0x00080000"
1347 This is the physical address in your flash memory the kernel will
1348 be linked for and stored to. This address is dependent on your
1352 bool "Kexec system call (EXPERIMENTAL)"
1353 depends on EXPERIMENTAL
1355 kexec is a system call that implements the ability to shutdown your
1356 current kernel, and to start another kernel. It is like a reboot
1357 but it is independent of the system firmware. And like a reboot
1358 you can start any kernel with it, not just Linux.
1360 It is an ongoing process to be certain the hardware in a machine
1361 is properly shutdown, so do not be surprised if this code does not
1362 initially work for you. It may help to enable device hotplugging
1366 bool "Export atags in procfs"
1370 Should the atags used to boot the kernel be exported in an "atags"
1371 file in procfs. Useful with kexec.
1375 menu "CPU Power Management"
1379 source "drivers/cpufreq/Kconfig"
1381 config CPU_FREQ_SA1100
1383 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1386 config CPU_FREQ_SA1110
1388 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1391 config CPU_FREQ_INTEGRATOR
1392 tristate "CPUfreq driver for ARM Integrator CPUs"
1393 depends on ARCH_INTEGRATOR && CPU_FREQ
1396 This enables the CPUfreq driver for ARM Integrator CPUs.
1398 For details, take a look at <file:Documentation/cpu-freq>.
1404 depends on CPU_FREQ && ARCH_PXA && PXA25x
1406 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1408 config CPU_FREQ_S3C64XX
1409 bool "CPUfreq support for Samsung S3C64XX CPUs"
1410 depends on CPU_FREQ && CPU_S3C6410
1415 Internal configuration node for common cpufreq on Samsung SoC
1417 config CPU_FREQ_S3C24XX
1418 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1419 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1422 This enables the CPUfreq driver for the Samsung S3C24XX family
1425 For details, take a look at <file:Documentation/cpu-freq>.
1429 config CPU_FREQ_S3C24XX_PLL
1430 bool "Support CPUfreq changing of PLL frequency"
1431 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1433 Compile in support for changing the PLL frequency from the
1434 S3C24XX series CPUfreq driver. The PLL takes time to settle
1435 after a frequency change, so by default it is not enabled.
1437 This also means that the PLL tables for the selected CPU(s) will
1438 be built which may increase the size of the kernel image.
1440 config CPU_FREQ_S3C24XX_DEBUG
1441 bool "Debug CPUfreq Samsung driver core"
1442 depends on CPU_FREQ_S3C24XX
1444 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1446 config CPU_FREQ_S3C24XX_IODEBUG
1447 bool "Debug CPUfreq Samsung driver IO timing"
1448 depends on CPU_FREQ_S3C24XX
1450 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1452 config CPU_FREQ_S3C24XX_DEBUGFS
1453 bool "Export debugfs for CPUFreq"
1454 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1456 Export status information via debugfs.
1460 source "drivers/cpuidle/Kconfig"
1464 menu "Floating point emulation"
1466 comment "At least one emulation must be selected"
1469 bool "NWFPE math emulation"
1470 depends on !AEABI || OABI_COMPAT
1472 Say Y to include the NWFPE floating point emulator in the kernel.
1473 This is necessary to run most binaries. Linux does not currently
1474 support floating point hardware so you need to say Y here even if
1475 your machine has an FPA or floating point co-processor podule.
1477 You may say N here if you are going to load the Acorn FPEmulator
1478 early in the bootup.
1481 bool "Support extended precision"
1482 depends on FPE_NWFPE
1484 Say Y to include 80-bit support in the kernel floating-point
1485 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1486 Note that gcc does not generate 80-bit operations by default,
1487 so in most cases this option only enlarges the size of the
1488 floating point emulator without any good reason.
1490 You almost surely want to say N here.
1493 bool "FastFPE math emulation (EXPERIMENTAL)"
1494 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1496 Say Y here to include the FAST floating point emulator in the kernel.
1497 This is an experimental much faster emulator which now also has full
1498 precision for the mantissa. It does not support any exceptions.
1499 It is very simple, and approximately 3-6 times faster than NWFPE.
1501 It should be sufficient for most programs. It may be not suitable
1502 for scientific calculations, but you have to check this for yourself.
1503 If you do not feel you need a faster FP emulation you should better
1507 bool "VFP-format floating point maths"
1508 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1510 Say Y to include VFP support code in the kernel. This is needed
1511 if your hardware includes a VFP unit.
1513 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1514 release notes and additional status information.
1516 Say N if your target does not have VFP hardware.
1524 bool "Advanced SIMD (NEON) Extension support"
1525 depends on VFPv3 && CPU_V7
1527 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1532 menu "Userspace binary formats"
1534 source "fs/Kconfig.binfmt"
1537 tristate "RISC OS personality"
1540 Say Y here to include the kernel code necessary if you want to run
1541 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1542 experimental; if this sounds frightening, say N and sleep in peace.
1543 You can also say M here to compile this support as a module (which
1544 will be called arthur).
1548 menu "Power management options"
1550 source "kernel/power/Kconfig"
1552 config ARCH_SUSPEND_POSSIBLE
1557 source "net/Kconfig"
1559 source "drivers/Kconfig"
1563 source "arch/arm/Kconfig.debug"
1565 source "security/Kconfig"
1567 source "crypto/Kconfig"
1569 source "lib/Kconfig"