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
21 select HAVE_KERNEL_GZIP
22 select HAVE_KERNEL_LZO
24 The ARM series is a line of low-power-consumption RISC chip designs
25 licensed by ARM Ltd and targeted at embedded applications and
26 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
27 manufactured, but legacy ARM-based PC hardware remains popular in
28 Europe. There is an ARM Linux project with a web page at
29 <http://www.arm.linux.org.uk/>.
34 config SYS_SUPPORTS_APM_EMULATION
43 config GENERIC_CLOCKEVENTS
46 config GENERIC_CLOCKEVENTS_BROADCAST
48 depends on GENERIC_CLOCKEVENTS
49 default y if SMP && !LOCAL_TIMERS
53 select GENERIC_ALLOCATOR
61 The Extended Industry Standard Architecture (EISA) bus was
62 developed as an open alternative to the IBM MicroChannel bus.
64 The EISA bus provided some of the features of the IBM MicroChannel
65 bus while maintaining backward compatibility with cards made for
66 the older ISA bus. The EISA bus saw limited use between 1988 and
67 1995 when it was made obsolete by the PCI bus.
69 Say Y here if you are building a kernel for an EISA-based machine.
79 MicroChannel Architecture is found in some IBM PS/2 machines and
80 laptops. It is a bus system similar to PCI or ISA. See
81 <file:Documentation/mca.txt> (and especially the web page given
82 there) before attempting to build an MCA bus kernel.
84 config GENERIC_HARDIRQS
88 config STACKTRACE_SUPPORT
92 config HAVE_LATENCYTOP_SUPPORT
97 config LOCKDEP_SUPPORT
101 config TRACE_IRQFLAGS_SUPPORT
105 config HARDIRQS_SW_RESEND
109 config GENERIC_IRQ_PROBE
113 config GENERIC_LOCKBREAK
116 depends on SMP && PREEMPT
118 config RWSEM_GENERIC_SPINLOCK
122 config RWSEM_XCHGADD_ALGORITHM
125 config ARCH_HAS_ILOG2_U32
128 config ARCH_HAS_ILOG2_U64
131 config ARCH_HAS_CPUFREQ
134 Internal node to signify that the ARCH has CPUFREQ support
135 and that the relevant menu configurations are displayed for
138 config GENERIC_HWEIGHT
142 config GENERIC_CALIBRATE_DELAY
146 config ARCH_MAY_HAVE_PC_FDC
152 config GENERIC_ISA_DMA
161 config GENERIC_HARDIRQS_NO__DO_IRQ
166 config OPROFILE_ARMV6
168 depends on CPU_V6 && !SMP
169 select OPROFILE_ARM11_CORE
171 config OPROFILE_MPCORE
173 depends on CPU_V6 && SMP
174 select OPROFILE_ARM11_CORE
176 config OPROFILE_ARM11_CORE
179 config OPROFILE_ARMV7
181 depends on CPU_V7 && !SMP
188 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
189 default DRAM_BASE if REMAP_VECTORS_TO_RAM
192 The base address of exception vectors.
194 source "init/Kconfig"
196 source "kernel/Kconfig.freezer"
201 bool "MMU-based Paged Memory Management Support"
204 Select if you want MMU-based virtualised addressing space
205 support by paged memory management. If unsure, say 'Y'.
208 prompt "ARM system type"
209 default ARCH_VERSATILE
212 bool "Agilent AAEC-2000 based"
217 This enables support for systems based on the Agilent AAEC-2000
219 config ARCH_INTEGRATOR
220 bool "ARM Ltd. Integrator family"
222 select ARCH_HAS_CPUFREQ
227 Support for ARM's Integrator platform.
230 bool "ARM Ltd. RealView family"
236 select GENERIC_CLOCKEVENTS
237 select ARCH_WANT_OPTIONAL_GPIOLIB
239 This enables support for ARM Ltd RealView boards.
241 config ARCH_VERSATILE
242 bool "ARM Ltd. Versatile family"
249 select GENERIC_CLOCKEVENTS
250 select ARCH_WANT_OPTIONAL_GPIOLIB
252 This enables support for ARM Ltd Versatile board.
257 select ARCH_REQUIRE_GPIOLIB
260 This enables support for systems based on the Atmel AT91RM9200,
261 AT91SAM9 and AT91CAP9 processors.
264 bool "Cirrus Logic CLPS711x/EP721x-based"
267 Support for Cirrus Logic 711x/721x based boards.
270 bool "Cortina Systems Gemini"
273 select ARCH_REQUIRE_GPIOLIB
275 Support for the Cortina Systems Gemini family SoCs
283 This is an evaluation board for the StrongARM processor available
284 from Digital. It has limited hardware on-board, including an
285 Ethernet interface, two PCMCIA sockets, two serial ports and a
296 select ARCH_REQUIRE_GPIOLIB
297 select ARCH_HAS_HOLES_MEMORYMODEL
299 This enables support for the Cirrus EP93xx series of CPUs.
301 config ARCH_FOOTBRIDGE
306 Support for systems based on the DC21285 companion chip
307 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
310 bool "Freescale MXC/iMX-based"
312 select GENERIC_CLOCKEVENTS
313 select ARCH_REQUIRE_GPIOLIB
317 Support for Freescale MXC/iMX-based family of processors
320 bool "Freescale STMP3xxx"
324 select ARCH_REQUIRE_GPIOLIB
326 select GENERIC_CLOCKEVENTS
328 select USB_ARCH_HAS_EHCI
330 Support for systems based on the Freescale 3xxx CPUs.
333 bool "Hilscher NetX based"
336 select GENERIC_CLOCKEVENTS
339 This enables support for systems based on the Hilscher NetX Soc
342 bool "Hynix HMS720x-based"
346 This enables support for systems based on the Hynix HMS720x
349 bool "STMicroelectronics Nomadik"
356 select GENERIC_CLOCKEVENTS
358 select ARCH_REQUIRE_GPIOLIB
360 Support for the Nomadik platform by ST-Ericsson
368 select ARCH_SUPPORTS_MSI
371 Support for Intel's IOP13XX (XScale) family of processors.
380 select ARCH_REQUIRE_GPIOLIB
382 Support for Intel's 80219 and IOP32X (XScale) family of
392 select ARCH_REQUIRE_GPIOLIB
394 Support for Intel's IOP33X (XScale) family of processors.
402 Support for Intel's IXP23xx (XScale) family of processors.
405 bool "IXP2400/2800-based"
410 Support for Intel's IXP2400/2800 (XScale) family of processors.
418 select GENERIC_CLOCKEVENTS
419 select DMABOUNCE if PCI
421 Support for Intel's IXP4XX (XScale) family of processors.
428 Say Y here if you intend to run this kernel on a LinkUp Systems
429 L7200 Software Development Board which uses an ARM720T processor.
430 Information on this board can be obtained at:
432 <http://www.linkupsys.com/>
434 If you have any questions or comments about the Linux kernel port
435 to this board, send e-mail to <sjhill@cotw.com>.
441 select ARCH_REQUIRE_GPIOLIB
443 select GENERIC_CLOCKEVENTS
446 Support for the Marvell Dove SoC 88AP510
449 bool "Marvell Kirkwood"
453 select ARCH_REQUIRE_GPIOLIB
455 select GENERIC_CLOCKEVENTS
458 Support for the following Marvell Kirkwood series SoCs:
459 88F6180, 88F6192 and 88F6281.
462 bool "Marvell Loki (88RC8480)"
465 select GENERIC_CLOCKEVENTS
468 Support for the Marvell Loki (88RC8480) SoC.
471 bool "Marvell MV78xx0"
475 select ARCH_REQUIRE_GPIOLIB
477 select GENERIC_CLOCKEVENTS
480 Support for the following Marvell MV78xx0 series SoCs:
489 select ARCH_REQUIRE_GPIOLIB
491 select GENERIC_CLOCKEVENTS
494 Support for the following Marvell Orion 5x series SoCs:
495 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
496 Orion-2 (5281), Orion-1-90 (6183).
499 bool "Marvell PXA168/910/MMP2"
502 select ARCH_REQUIRE_GPIOLIB
506 select GENERIC_CLOCKEVENTS
510 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
513 bool "Micrel/Kendin KS8695"
516 select ARCH_REQUIRE_GPIOLIB
518 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
519 System-on-Chip devices.
522 bool "NetSilicon NS9xxx"
526 select GENERIC_CLOCKEVENTS
529 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
532 <http://www.digi.com/products/microprocessors/index.jsp>
535 bool "Nuvoton W90X900 CPU"
537 select ARCH_REQUIRE_GPIOLIB
542 select GENERIC_CLOCKEVENTS
544 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
545 At present, the w90x900 has been renamed nuc900, regarding
546 the ARM series product line, you can login the following
547 link address to know more.
549 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
550 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
553 bool "Philips Nexperia PNX4008 Mobile"
557 This enables support for Philips PNX4008 mobile platform.
560 bool "PXA2xx/PXA3xx-based"
563 select ARCH_HAS_CPUFREQ
567 select ARCH_REQUIRE_GPIOLIB
569 select GENERIC_CLOCKEVENTS
573 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
579 select GENERIC_CLOCKEVENTS
581 Support for Qualcomm MSM7K based systems. This runs on the ARM11
582 apps processor of the MSM7K and depends on a shared memory
583 interface to the ARM9 modem processor which runs the baseband stack
584 and controls some vital subsystems (clock and power control, etc).
591 select ARCH_MAY_HAVE_PC_FDC
592 select HAVE_PATA_PLATFORM
595 select ARCH_SPARSEMEM_ENABLE
597 On the Acorn Risc-PC, Linux can support the internal IDE disk and
598 CD-ROM interface, serial and parallel port, and the floppy drive.
604 select ARCH_SPARSEMEM_ENABLE
606 select ARCH_HAS_CPUFREQ
610 select GENERIC_CLOCKEVENTS
613 select ARCH_REQUIRE_GPIOLIB
615 Support for StrongARM 11x0 based boards.
618 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
620 select ARCH_HAS_CPUFREQ
623 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
624 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
625 the Samsung SMDK2410 development board (and derivatives).
628 bool "Samsung S3C64XX"
631 select ARCH_HAS_CPUFREQ
633 Samsung S3C64XX series based systems
636 bool "Samsung S5P6440"
641 Samsung S5P6440 CPU based systems
644 bool "Samsung S5PC1XX"
649 Samsung S5PC1XX series based systems
659 Support for the StrongARM based Digital DNARD machine, also known
660 as "Shark" (<http://www.shark-linux.de/shark.html>).
665 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
666 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
668 Say Y here for systems based on one of the Sharp LH7A40X
669 System on a Chip processors. These CPUs include an ARM922T
670 core with a wide array of integrated devices for
671 hand-held and low-power applications.
674 bool "ST-Ericsson U300 Series"
681 select GENERIC_CLOCKEVENTS
686 Support for ST-Ericsson U300 series mobile platforms.
692 select GENERIC_CLOCKEVENTS
694 select ARCH_REQUIRE_GPIOLIB
699 select GENERIC_ALLOCATOR
700 select ARCH_HAS_HOLES_MEMORYMODEL
702 Support for TI's DaVinci platform.
708 select ARCH_REQUIRE_GPIOLIB
709 select ARCH_HAS_CPUFREQ
711 select GENERIC_CLOCKEVENTS
712 select ARCH_HAS_HOLES_MEMORYMODEL
714 Support for TI's OMAP platform (OMAP1 and OMAP2).
717 bool "Broadcom BCMRING"
723 select GENERIC_CLOCKEVENTS
724 select ARCH_WANT_OPTIONAL_GPIOLIB
726 Support for Broadcom's BCMRing platform.
729 bool "ST-Ericsson U8500 Series"
733 select GENERIC_CLOCKEVENTS
736 Support for ST-Ericsson's Ux500 architecture
740 source "arch/arm/mach-aaec2000/Kconfig"
742 source "arch/arm/mach-at91/Kconfig"
744 source "arch/arm/mach-bcmring/Kconfig"
746 source "arch/arm/mach-clps711x/Kconfig"
748 source "arch/arm/mach-davinci/Kconfig"
750 source "arch/arm/mach-dove/Kconfig"
752 source "arch/arm/mach-ep93xx/Kconfig"
754 source "arch/arm/mach-footbridge/Kconfig"
756 source "arch/arm/mach-gemini/Kconfig"
758 source "arch/arm/mach-h720x/Kconfig"
760 source "arch/arm/mach-integrator/Kconfig"
762 source "arch/arm/mach-iop32x/Kconfig"
764 source "arch/arm/mach-iop33x/Kconfig"
766 source "arch/arm/mach-iop13xx/Kconfig"
768 source "arch/arm/mach-ixp4xx/Kconfig"
770 source "arch/arm/mach-ixp2000/Kconfig"
772 source "arch/arm/mach-ixp23xx/Kconfig"
774 source "arch/arm/mach-kirkwood/Kconfig"
776 source "arch/arm/mach-ks8695/Kconfig"
778 source "arch/arm/mach-lh7a40x/Kconfig"
780 source "arch/arm/mach-loki/Kconfig"
782 source "arch/arm/mach-msm/Kconfig"
784 source "arch/arm/mach-mv78xx0/Kconfig"
786 source "arch/arm/plat-mxc/Kconfig"
788 source "arch/arm/mach-netx/Kconfig"
790 source "arch/arm/mach-nomadik/Kconfig"
791 source "arch/arm/plat-nomadik/Kconfig"
793 source "arch/arm/mach-ns9xxx/Kconfig"
795 source "arch/arm/plat-omap/Kconfig"
797 source "arch/arm/mach-omap1/Kconfig"
799 source "arch/arm/mach-omap2/Kconfig"
801 source "arch/arm/mach-orion5x/Kconfig"
803 source "arch/arm/mach-pxa/Kconfig"
804 source "arch/arm/plat-pxa/Kconfig"
806 source "arch/arm/mach-mmp/Kconfig"
808 source "arch/arm/mach-realview/Kconfig"
810 source "arch/arm/mach-sa1100/Kconfig"
812 source "arch/arm/plat-samsung/Kconfig"
813 source "arch/arm/plat-s3c24xx/Kconfig"
814 source "arch/arm/plat-s3c64xx/Kconfig"
815 source "arch/arm/plat-s3c/Kconfig"
816 source "arch/arm/plat-s5p/Kconfig"
817 source "arch/arm/plat-s5pc1xx/Kconfig"
820 source "arch/arm/mach-s3c2400/Kconfig"
821 source "arch/arm/mach-s3c2410/Kconfig"
822 source "arch/arm/mach-s3c2412/Kconfig"
823 source "arch/arm/mach-s3c2440/Kconfig"
824 source "arch/arm/mach-s3c2442/Kconfig"
825 source "arch/arm/mach-s3c2443/Kconfig"
829 source "arch/arm/mach-s3c6400/Kconfig"
830 source "arch/arm/mach-s3c6410/Kconfig"
833 source "arch/arm/mach-s5p6440/Kconfig"
835 source "arch/arm/plat-stmp3xxx/Kconfig"
838 source "arch/arm/mach-s5pc100/Kconfig"
841 source "arch/arm/mach-u300/Kconfig"
843 source "arch/arm/mach-ux500/Kconfig"
845 source "arch/arm/mach-versatile/Kconfig"
847 source "arch/arm/mach-w90x900/Kconfig"
849 # Definitions to make life easier
855 select GENERIC_CLOCKEVENTS
864 source arch/arm/mm/Kconfig
867 bool "Enable iWMMXt support"
868 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
869 default y if PXA27x || PXA3xx || ARCH_MMP
871 Enable support for iWMMXt context switching at run time if
872 running on a CPU that supports it.
874 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
877 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
881 source "arch/arm/Kconfig-nommu"
884 config ARM_ERRATA_411920
885 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
886 depends on CPU_V6 && !SMP
888 Invalidation of the Instruction Cache operation can
889 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
890 It does not affect the MPCore. This option enables the ARM Ltd.
891 recommended workaround.
893 config ARM_ERRATA_430973
894 bool "ARM errata: Stale prediction on replaced interworking branch"
897 This option enables the workaround for the 430973 Cortex-A8
898 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
899 interworking branch is replaced with another code sequence at the
900 same virtual address, whether due to self-modifying code or virtual
901 to physical address re-mapping, Cortex-A8 does not recover from the
902 stale interworking branch prediction. This results in Cortex-A8
903 executing the new code sequence in the incorrect ARM or Thumb state.
904 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
905 and also flushes the branch target cache at every context switch.
906 Note that setting specific bits in the ACTLR register may not be
907 available in non-secure mode.
909 config ARM_ERRATA_458693
910 bool "ARM errata: Processor deadlock when a false hazard is created"
913 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
914 erratum. For very specific sequences of memory operations, it is
915 possible for a hazard condition intended for a cache line to instead
916 be incorrectly associated with a different cache line. This false
917 hazard might then cause a processor deadlock. The workaround enables
918 the L1 caching of the NEON accesses and disables the PLD instruction
919 in the ACTLR register. Note that setting specific bits in the ACTLR
920 register may not be available in non-secure mode.
922 config ARM_ERRATA_460075
923 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
926 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
927 erratum. Any asynchronous access to the L2 cache may encounter a
928 situation in which recent store transactions to the L2 cache are lost
929 and overwritten with stale memory contents from external memory. The
930 workaround disables the write-allocate mode for the L2 cache via the
931 ACTLR register. Note that setting specific bits in the ACTLR register
932 may not be available in non-secure mode.
936 source "arch/arm/common/Kconfig"
938 config FORCE_MAX_ZONEORDER
951 Find out whether you have ISA slots on your motherboard. ISA is the
952 name of a bus system, i.e. the way the CPU talks to the other stuff
953 inside your box. Other bus systems are PCI, EISA, MicroChannel
954 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
955 newer boards don't support it. If you have ISA, say Y, otherwise N.
957 # Select ISA DMA controller support
962 # Select ISA DMA interface
967 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
969 Find out whether you have a PCI motherboard. PCI is the name of a
970 bus system, i.e. the way the CPU talks to the other stuff inside
971 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
972 VESA. If you have PCI, say Y, otherwise N.
977 # Select the host bridge type
978 config PCI_HOST_VIA82C505
980 depends on PCI && ARCH_SHARK
983 config PCI_HOST_ITE8152
985 depends on PCI && MACH_ARMCORE
989 source "drivers/pci/Kconfig"
991 source "drivers/pcmcia/Kconfig"
995 menu "Kernel Features"
997 source "kernel/time/Kconfig"
1000 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1001 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1002 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1003 depends on GENERIC_CLOCKEVENTS
1004 select USE_GENERIC_SMP_HELPERS
1005 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1007 This enables support for systems with more than one CPU. If you have
1008 a system with only one CPU, like most personal computers, say N. If
1009 you have a system with more than one CPU, say Y.
1011 If you say N here, the kernel will run on single and multiprocessor
1012 machines, but will use only one CPU of a multiprocessor machine. If
1013 you say Y here, the kernel will run on many, but not all, single
1014 processor machines. On a single processor machine, the kernel will
1015 run faster if you say N here.
1017 See also <file:Documentation/i386/IO-APIC.txt>,
1018 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1019 <http://www.linuxdoc.org/docs.html#howto>.
1021 If you don't know what to do here, say N.
1027 This option enables support for the ARM system coherency unit
1033 This options enables support for the ARM timer and watchdog unit
1036 prompt "Memory split"
1039 Select the desired split between kernel and user memory.
1041 If you are not absolutely sure what you are doing, leave this
1045 bool "3G/1G user/kernel split"
1047 bool "2G/2G user/kernel split"
1049 bool "1G/3G user/kernel split"
1054 default 0x40000000 if VMSPLIT_1G
1055 default 0x80000000 if VMSPLIT_2G
1059 int "Maximum number of CPUs (2-32)"
1065 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1066 depends on SMP && HOTPLUG && EXPERIMENTAL
1068 Say Y here to experiment with turning CPUs off and on. CPUs
1069 can be controlled through /sys/devices/system/cpu.
1072 bool "Use local timer interrupts"
1073 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1074 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1076 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1078 Enable support for local timers on SMP platforms, rather then the
1079 legacy IPI broadcast method. Local timers allows the system
1080 accounting to be spread across the timer interval, preventing a
1081 "thundering herd" at every timer tick.
1083 source kernel/Kconfig.preempt
1087 default 128 if ARCH_L7200
1088 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440
1089 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1090 default AT91_TIMER_HZ if ARCH_AT91
1093 config THUMB2_KERNEL
1094 bool "Compile the kernel in Thumb-2 mode"
1095 depends on CPU_V7 && EXPERIMENTAL
1097 select ARM_ASM_UNIFIED
1099 By enabling this option, the kernel will be compiled in
1100 Thumb-2 mode. A compiler/assembler that understand the unified
1101 ARM-Thumb syntax is needed.
1105 config ARM_ASM_UNIFIED
1109 bool "Use the ARM EABI to compile the kernel"
1111 This option allows for the kernel to be compiled using the latest
1112 ARM ABI (aka EABI). This is only useful if you are using a user
1113 space environment that is also compiled with EABI.
1115 Since there are major incompatibilities between the legacy ABI and
1116 EABI, especially with regard to structure member alignment, this
1117 option also changes the kernel syscall calling convention to
1118 disambiguate both ABIs and allow for backward compatibility support
1119 (selected with CONFIG_OABI_COMPAT).
1121 To use this you need GCC version 4.0.0 or later.
1124 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1125 depends on AEABI && EXPERIMENTAL
1128 This option preserves the old syscall interface along with the
1129 new (ARM EABI) one. It also provides a compatibility layer to
1130 intercept syscalls that have structure arguments which layout
1131 in memory differs between the legacy ABI and the new ARM EABI
1132 (only for non "thumb" binaries). This option adds a tiny
1133 overhead to all syscalls and produces a slightly larger kernel.
1134 If you know you'll be using only pure EABI user space then you
1135 can say N here. If this option is not selected and you attempt
1136 to execute a legacy ABI binary then the result will be
1137 UNPREDICTABLE (in fact it can be predicted that it won't work
1138 at all). If in doubt say Y.
1140 config ARCH_HAS_HOLES_MEMORYMODEL
1143 # Discontigmem is deprecated
1144 config ARCH_DISCONTIGMEM_ENABLE
1147 config ARCH_SPARSEMEM_ENABLE
1150 config ARCH_SPARSEMEM_DEFAULT
1151 def_bool ARCH_SPARSEMEM_ENABLE
1153 config ARCH_SELECT_MEMORY_MODEL
1154 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1158 default "4" if ARCH_LH7A40X
1160 depends on NEED_MULTIPLE_NODES
1163 bool "High Memory Support (EXPERIMENTAL)"
1164 depends on MMU && EXPERIMENTAL
1166 The address space of ARM processors is only 4 Gigabytes large
1167 and it has to accommodate user address space, kernel address
1168 space as well as some memory mapped IO. That means that, if you
1169 have a large amount of physical memory and/or IO, not all of the
1170 memory can be "permanently mapped" by the kernel. The physical
1171 memory that is not permanently mapped is called "high memory".
1173 Depending on the selected kernel/user memory split, minimum
1174 vmalloc space and actual amount of RAM, you may not need this
1175 option which should result in a slightly faster kernel.
1180 bool "Allocate 2nd-level pagetables from highmem"
1182 depends on !OUTER_CACHE
1187 bool "Timer and CPU usage LEDs"
1188 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1189 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1190 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1191 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1192 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1193 ARCH_AT91 || ARCH_DAVINCI || \
1194 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1196 If you say Y here, the LEDs on your machine will be used
1197 to provide useful information about your current system status.
1199 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1200 be able to select which LEDs are active using the options below. If
1201 you are compiling a kernel for the EBSA-110 or the LART however, the
1202 red LED will simply flash regularly to indicate that the system is
1203 still functional. It is safe to say Y here if you have a CATS
1204 system, but the driver will do nothing.
1207 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1208 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1209 || MACH_OMAP_PERSEUS2
1211 depends on !GENERIC_CLOCKEVENTS
1212 default y if ARCH_EBSA110
1214 If you say Y here, one of the system LEDs (the green one on the
1215 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1216 will flash regularly to indicate that the system is still
1217 operational. This is mainly useful to kernel hackers who are
1218 debugging unstable kernels.
1220 The LART uses the same LED for both Timer LED and CPU usage LED
1221 functions. You may choose to use both, but the Timer LED function
1222 will overrule the CPU usage LED.
1225 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1227 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1228 || MACH_OMAP_PERSEUS2
1231 If you say Y here, the red LED will be used to give a good real
1232 time indication of CPU usage, by lighting whenever the idle task
1233 is not currently executing.
1235 The LART uses the same LED for both Timer LED and CPU usage LED
1236 functions. You may choose to use both, but the Timer LED function
1237 will overrule the CPU usage LED.
1239 config ALIGNMENT_TRAP
1241 depends on CPU_CP15_MMU
1242 default y if !ARCH_EBSA110
1244 ARM processors cannot fetch/store information which is not
1245 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1246 address divisible by 4. On 32-bit ARM processors, these non-aligned
1247 fetch/store instructions will be emulated in software if you say
1248 here, which has a severe performance impact. This is necessary for
1249 correct operation of some network protocols. With an IP-only
1250 configuration it is safe to say N, otherwise say Y.
1252 config UACCESS_WITH_MEMCPY
1253 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1254 depends on MMU && EXPERIMENTAL
1255 default y if CPU_FEROCEON
1257 Implement faster copy_to_user and clear_user methods for CPU
1258 cores where a 8-word STM instruction give significantly higher
1259 memory write throughput than a sequence of individual 32bit stores.
1261 A possible side effect is a slight increase in scheduling latency
1262 between threads sharing the same address space if they invoke
1263 such copy operations with large buffers.
1265 However, if the CPU data cache is using a write-allocate mode,
1266 this option is unlikely to provide any performance gain.
1272 # Compressed boot loader in ROM. Yes, we really want to ask about
1273 # TEXT and BSS so we preserve their values in the config files.
1274 config ZBOOT_ROM_TEXT
1275 hex "Compressed ROM boot loader base address"
1278 The physical address at which the ROM-able zImage is to be
1279 placed in the target. Platforms which normally make use of
1280 ROM-able zImage formats normally set this to a suitable
1281 value in their defconfig file.
1283 If ZBOOT_ROM is not enabled, this has no effect.
1285 config ZBOOT_ROM_BSS
1286 hex "Compressed ROM boot loader BSS address"
1289 The base address of an area of read/write memory in the target
1290 for the ROM-able zImage which must be available while the
1291 decompressor is running. It must be large enough to hold the
1292 entire decompressed kernel plus an additional 128 KiB.
1293 Platforms which normally make use of ROM-able zImage formats
1294 normally set this to a suitable value in their defconfig file.
1296 If ZBOOT_ROM is not enabled, this has no effect.
1299 bool "Compressed boot loader in ROM/flash"
1300 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1302 Say Y here if you intend to execute your compressed kernel image
1303 (zImage) directly from ROM or flash. If unsure, say N.
1306 string "Default kernel command string"
1309 On some architectures (EBSA110 and CATS), there is currently no way
1310 for the boot loader to pass arguments to the kernel. For these
1311 architectures, you should supply some command-line options at build
1312 time by entering them here. As a minimum, you should specify the
1313 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1316 bool "Kernel Execute-In-Place from ROM"
1317 depends on !ZBOOT_ROM
1319 Execute-In-Place allows the kernel to run from non-volatile storage
1320 directly addressable by the CPU, such as NOR flash. This saves RAM
1321 space since the text section of the kernel is not loaded from flash
1322 to RAM. Read-write sections, such as the data section and stack,
1323 are still copied to RAM. The XIP kernel is not compressed since
1324 it has to run directly from flash, so it will take more space to
1325 store it. The flash address used to link the kernel object files,
1326 and for storing it, is configuration dependent. Therefore, if you
1327 say Y here, you must know the proper physical address where to
1328 store the kernel image depending on your own flash memory usage.
1330 Also note that the make target becomes "make xipImage" rather than
1331 "make zImage" or "make Image". The final kernel binary to put in
1332 ROM memory will be arch/arm/boot/xipImage.
1336 config XIP_PHYS_ADDR
1337 hex "XIP Kernel Physical Location"
1338 depends on XIP_KERNEL
1339 default "0x00080000"
1341 This is the physical address in your flash memory the kernel will
1342 be linked for and stored to. This address is dependent on your
1346 bool "Kexec system call (EXPERIMENTAL)"
1347 depends on EXPERIMENTAL
1349 kexec is a system call that implements the ability to shutdown your
1350 current kernel, and to start another kernel. It is like a reboot
1351 but it is independent of the system firmware. And like a reboot
1352 you can start any kernel with it, not just Linux.
1354 It is an ongoing process to be certain the hardware in a machine
1355 is properly shutdown, so do not be surprised if this code does not
1356 initially work for you. It may help to enable device hotplugging
1360 bool "Export atags in procfs"
1364 Should the atags used to boot the kernel be exported in an "atags"
1365 file in procfs. Useful with kexec.
1369 menu "CPU Power Management"
1373 source "drivers/cpufreq/Kconfig"
1375 config CPU_FREQ_SA1100
1378 config CPU_FREQ_SA1110
1381 config CPU_FREQ_INTEGRATOR
1382 tristate "CPUfreq driver for ARM Integrator CPUs"
1383 depends on ARCH_INTEGRATOR && CPU_FREQ
1386 This enables the CPUfreq driver for ARM Integrator CPUs.
1388 For details, take a look at <file:Documentation/cpu-freq>.
1394 depends on CPU_FREQ && ARCH_PXA && PXA25x
1396 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1398 config CPU_FREQ_S3C64XX
1399 bool "CPUfreq support for Samsung S3C64XX CPUs"
1400 depends on CPU_FREQ && CPU_S3C6410
1405 Internal configuration node for common cpufreq on Samsung SoC
1407 config CPU_FREQ_S3C24XX
1408 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1409 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1412 This enables the CPUfreq driver for the Samsung S3C24XX family
1415 For details, take a look at <file:Documentation/cpu-freq>.
1419 config CPU_FREQ_S3C24XX_PLL
1420 bool "Support CPUfreq changing of PLL frequency"
1421 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1423 Compile in support for changing the PLL frequency from the
1424 S3C24XX series CPUfreq driver. The PLL takes time to settle
1425 after a frequency change, so by default it is not enabled.
1427 This also means that the PLL tables for the selected CPU(s) will
1428 be built which may increase the size of the kernel image.
1430 config CPU_FREQ_S3C24XX_DEBUG
1431 bool "Debug CPUfreq Samsung driver core"
1432 depends on CPU_FREQ_S3C24XX
1434 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1436 config CPU_FREQ_S3C24XX_IODEBUG
1437 bool "Debug CPUfreq Samsung driver IO timing"
1438 depends on CPU_FREQ_S3C24XX
1440 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1442 config CPU_FREQ_S3C24XX_DEBUGFS
1443 bool "Export debugfs for CPUFreq"
1444 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1446 Export status information via debugfs.
1450 source "drivers/cpuidle/Kconfig"
1454 menu "Floating point emulation"
1456 comment "At least one emulation must be selected"
1459 bool "NWFPE math emulation"
1460 depends on !AEABI || OABI_COMPAT
1462 Say Y to include the NWFPE floating point emulator in the kernel.
1463 This is necessary to run most binaries. Linux does not currently
1464 support floating point hardware so you need to say Y here even if
1465 your machine has an FPA or floating point co-processor podule.
1467 You may say N here if you are going to load the Acorn FPEmulator
1468 early in the bootup.
1471 bool "Support extended precision"
1472 depends on FPE_NWFPE
1474 Say Y to include 80-bit support in the kernel floating-point
1475 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1476 Note that gcc does not generate 80-bit operations by default,
1477 so in most cases this option only enlarges the size of the
1478 floating point emulator without any good reason.
1480 You almost surely want to say N here.
1483 bool "FastFPE math emulation (EXPERIMENTAL)"
1484 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1486 Say Y here to include the FAST floating point emulator in the kernel.
1487 This is an experimental much faster emulator which now also has full
1488 precision for the mantissa. It does not support any exceptions.
1489 It is very simple, and approximately 3-6 times faster than NWFPE.
1491 It should be sufficient for most programs. It may be not suitable
1492 for scientific calculations, but you have to check this for yourself.
1493 If you do not feel you need a faster FP emulation you should better
1497 bool "VFP-format floating point maths"
1498 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1500 Say Y to include VFP support code in the kernel. This is needed
1501 if your hardware includes a VFP unit.
1503 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1504 release notes and additional status information.
1506 Say N if your target does not have VFP hardware.
1514 bool "Advanced SIMD (NEON) Extension support"
1515 depends on VFPv3 && CPU_V7
1517 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1522 menu "Userspace binary formats"
1524 source "fs/Kconfig.binfmt"
1527 tristate "RISC OS personality"
1530 Say Y here to include the kernel code necessary if you want to run
1531 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1532 experimental; if this sounds frightening, say N and sleep in peace.
1533 You can also say M here to compile this support as a module (which
1534 will be called arthur).
1538 menu "Power management options"
1540 source "kernel/power/Kconfig"
1542 config ARCH_SUSPEND_POSSIBLE
1547 source "net/Kconfig"
1549 source "drivers/Kconfig"
1553 source "arch/arm/Kconfig.debug"
1555 source "security/Kconfig"
1557 source "crypto/Kconfig"
1559 source "lib/Kconfig"