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 Rk29"
713 select HAVE_SCHED_CLOCK
714 select ARCH_HAS_CPUFREQ
716 select GENERIC_CLOCKEVENTS
717 select ARCH_REQUIRE_GPIOLIB
723 Support for Rockchip RK29 soc.
727 source "arch/arm/mach-clps711x/Kconfig"
729 source "arch/arm/mach-ep93xx/Kconfig"
731 source "arch/arm/mach-footbridge/Kconfig"
733 source "arch/arm/mach-gemini/Kconfig"
735 source "arch/arm/mach-integrator/Kconfig"
737 source "arch/arm/mach-iop32x/Kconfig"
739 source "arch/arm/mach-iop33x/Kconfig"
741 source "arch/arm/mach-iop13xx/Kconfig"
743 source "arch/arm/mach-ixp4xx/Kconfig"
745 source "arch/arm/mach-ixp2000/Kconfig"
747 source "arch/arm/mach-ixp23xx/Kconfig"
749 source "arch/arm/mach-loki/Kconfig"
751 source "arch/arm/mach-mv78xx0/Kconfig"
753 source "arch/arm/mach-pxa/Kconfig"
754 source "arch/arm/plat-pxa/Kconfig"
756 source "arch/arm/mach-mmp/Kconfig"
758 source "arch/arm/mach-sa1100/Kconfig"
760 source "arch/arm/plat-omap/Kconfig"
762 source "arch/arm/mach-omap1/Kconfig"
764 source "arch/arm/mach-omap2/Kconfig"
766 source "arch/arm/mach-orion5x/Kconfig"
768 source "arch/arm/mach-kirkwood/Kconfig"
770 source "arch/arm/plat-s3c24xx/Kconfig"
771 source "arch/arm/plat-s3c64xx/Kconfig"
772 source "arch/arm/plat-s3c/Kconfig"
773 source "arch/arm/plat-s5pc1xx/Kconfig"
776 source "arch/arm/mach-s3c2400/Kconfig"
777 source "arch/arm/mach-s3c2410/Kconfig"
778 source "arch/arm/mach-s3c2412/Kconfig"
779 source "arch/arm/mach-s3c2440/Kconfig"
780 source "arch/arm/mach-s3c2442/Kconfig"
781 source "arch/arm/mach-s3c2443/Kconfig"
785 source "arch/arm/mach-s3c6400/Kconfig"
786 source "arch/arm/mach-s3c6410/Kconfig"
789 source "arch/arm/plat-stmp3xxx/Kconfig"
792 source "arch/arm/mach-s5pc100/Kconfig"
795 source "arch/arm/mach-lh7a40x/Kconfig"
797 source "arch/arm/mach-h720x/Kconfig"
799 source "arch/arm/mach-versatile/Kconfig"
801 source "arch/arm/mach-aaec2000/Kconfig"
803 source "arch/arm/mach-realview/Kconfig"
805 source "arch/arm/mach-at91/Kconfig"
807 source "arch/arm/plat-mxc/Kconfig"
809 source "arch/arm/mach-nomadik/Kconfig"
811 source "arch/arm/mach-netx/Kconfig"
813 source "arch/arm/mach-ns9xxx/Kconfig"
815 source "arch/arm/mach-davinci/Kconfig"
817 source "arch/arm/mach-ks8695/Kconfig"
819 source "arch/arm/mach-msm/Kconfig"
821 source "arch/arm/mach-u300/Kconfig"
823 source "arch/arm/mach-w90x900/Kconfig"
825 source "arch/arm/mach-bcmring/Kconfig"
827 source "arch/arm/mach-rk29/Kconfig"
829 # Definitions to make life easier
842 source arch/arm/mm/Kconfig
845 bool "Enable iWMMXt support"
846 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
847 default y if PXA27x || PXA3xx || ARCH_MMP
849 Enable support for iWMMXt context switching at run time if
850 running on a CPU that supports it.
852 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
855 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
859 source "arch/arm/Kconfig-nommu"
862 config ARM_ERRATA_411920
863 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
864 depends on CPU_V6 && !SMP
866 Invalidation of the Instruction Cache operation can
867 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
868 It does not affect the MPCore. This option enables the ARM Ltd.
869 recommended workaround.
871 config ARM_ERRATA_430973
872 bool "ARM errata: Stale prediction on replaced interworking branch"
875 This option enables the workaround for the 430973 Cortex-A8
876 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
877 interworking branch is replaced with another code sequence at the
878 same virtual address, whether due to self-modifying code or virtual
879 to physical address re-mapping, Cortex-A8 does not recover from the
880 stale interworking branch prediction. This results in Cortex-A8
881 executing the new code sequence in the incorrect ARM or Thumb state.
882 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
883 and also flushes the branch target cache at every context switch.
884 Note that setting specific bits in the ACTLR register may not be
885 available in non-secure mode.
887 config ARM_ERRATA_458693
888 bool "ARM errata: Processor deadlock when a false hazard is created"
891 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
892 erratum. For very specific sequences of memory operations, it is
893 possible for a hazard condition intended for a cache line to instead
894 be incorrectly associated with a different cache line. This false
895 hazard might then cause a processor deadlock. The workaround enables
896 the L1 caching of the NEON accesses and disables the PLD instruction
897 in the ACTLR register. Note that setting specific bits in the ACTLR
898 register may not be available in non-secure mode.
900 config ARM_ERRATA_460075
901 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
904 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
905 erratum. Any asynchronous access to the L2 cache may encounter a
906 situation in which recent store transactions to the L2 cache are lost
907 and overwritten with stale memory contents from external memory. The
908 workaround disables the write-allocate mode for the L2 cache via the
909 ACTLR register. Note that setting specific bits in the ACTLR register
910 may not be available in non-secure mode.
914 source "arch/arm/common/Kconfig"
916 config FORCE_MAX_ZONEORDER
929 Find out whether you have ISA slots on your motherboard. ISA is the
930 name of a bus system, i.e. the way the CPU talks to the other stuff
931 inside your box. Other bus systems are PCI, EISA, MicroChannel
932 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
933 newer boards don't support it. If you have ISA, say Y, otherwise N.
935 # Select ISA DMA controller support
940 # Select ISA DMA interface
945 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
947 Find out whether you have a PCI motherboard. PCI is the name of a
948 bus system, i.e. the way the CPU talks to the other stuff inside
949 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
950 VESA. If you have PCI, say Y, otherwise N.
955 # Select the host bridge type
956 config PCI_HOST_VIA82C505
958 depends on PCI && ARCH_SHARK
961 config PCI_HOST_ITE8152
963 depends on PCI && MACH_ARMCORE
967 source "drivers/pci/Kconfig"
969 source "drivers/pcmcia/Kconfig"
973 menu "Kernel Features"
975 source "kernel/time/Kconfig"
978 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
979 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
980 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
981 depends on GENERIC_CLOCKEVENTS
982 select USE_GENERIC_SMP_HELPERS
983 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
985 This enables support for systems with more than one CPU. If you have
986 a system with only one CPU, like most personal computers, say N. If
987 you have a system with more than one CPU, say Y.
989 If you say N here, the kernel will run on single and multiprocessor
990 machines, but will use only one CPU of a multiprocessor machine. If
991 you say Y here, the kernel will run on many, but not all, single
992 processor machines. On a single processor machine, the kernel will
993 run faster if you say N here.
995 See also <file:Documentation/i386/IO-APIC.txt>,
996 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
997 <http://www.linuxdoc.org/docs.html#howto>.
999 If you don't know what to do here, say N.
1005 This option enables support for the ARM system coherency unit
1011 This options enables support for the ARM timer and watchdog unit
1014 prompt "Memory split"
1017 Select the desired split between kernel and user memory.
1019 If you are not absolutely sure what you are doing, leave this
1023 bool "3G/1G user/kernel split"
1025 bool "2G/2G user/kernel split"
1027 bool "1G/3G user/kernel split"
1032 default 0x40000000 if VMSPLIT_1G
1033 default 0x80000000 if VMSPLIT_2G
1037 int "Maximum number of CPUs (2-32)"
1043 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1044 depends on SMP && HOTPLUG && EXPERIMENTAL
1046 Say Y here to experiment with turning CPUs off and on. CPUs
1047 can be controlled through /sys/devices/system/cpu.
1050 bool "Use local timer interrupts"
1051 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1052 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
1054 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
1056 Enable support for local timers on SMP platforms, rather then the
1057 legacy IPI broadcast method. Local timers allows the system
1058 accounting to be spread across the timer interval, preventing a
1059 "thundering herd" at every timer tick.
1061 source kernel/Kconfig.preempt
1065 default 128 if ARCH_L7200
1066 default 200 if ARCH_EBSA110 || ARCH_S3C2410
1067 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1068 default AT91_TIMER_HZ if ARCH_AT91
1071 config THUMB2_KERNEL
1072 bool "Compile the kernel in Thumb-2 mode"
1073 depends on CPU_V7 && EXPERIMENTAL
1075 select ARM_ASM_UNIFIED
1077 By enabling this option, the kernel will be compiled in
1078 Thumb-2 mode. A compiler/assembler that understand the unified
1079 ARM-Thumb syntax is needed.
1083 config ARM_ASM_UNIFIED
1087 bool "Use the ARM EABI to compile the kernel"
1089 This option allows for the kernel to be compiled using the latest
1090 ARM ABI (aka EABI). This is only useful if you are using a user
1091 space environment that is also compiled with EABI.
1093 Since there are major incompatibilities between the legacy ABI and
1094 EABI, especially with regard to structure member alignment, this
1095 option also changes the kernel syscall calling convention to
1096 disambiguate both ABIs and allow for backward compatibility support
1097 (selected with CONFIG_OABI_COMPAT).
1099 To use this you need GCC version 4.0.0 or later.
1102 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1103 depends on AEABI && EXPERIMENTAL
1106 This option preserves the old syscall interface along with the
1107 new (ARM EABI) one. It also provides a compatibility layer to
1108 intercept syscalls that have structure arguments which layout
1109 in memory differs between the legacy ABI and the new ARM EABI
1110 (only for non "thumb" binaries). This option adds a tiny
1111 overhead to all syscalls and produces a slightly larger kernel.
1112 If you know you'll be using only pure EABI user space then you
1113 can say N here. If this option is not selected and you attempt
1114 to execute a legacy ABI binary then the result will be
1115 UNPREDICTABLE (in fact it can be predicted that it won't work
1116 at all). If in doubt say Y.
1118 config ARCH_HAS_HOLES_MEMORYMODEL
1121 # Discontigmem is deprecated
1122 config ARCH_DISCONTIGMEM_ENABLE
1125 config ARCH_SPARSEMEM_ENABLE
1128 config ARCH_SPARSEMEM_DEFAULT
1129 def_bool ARCH_SPARSEMEM_ENABLE
1131 config ARCH_SELECT_MEMORY_MODEL
1132 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1136 default "4" if ARCH_LH7A40X
1138 depends on NEED_MULTIPLE_NODES
1141 bool "High Memory Support (EXPERIMENTAL)"
1142 depends on MMU && EXPERIMENTAL
1144 The address space of ARM processors is only 4 Gigabytes large
1145 and it has to accommodate user address space, kernel address
1146 space as well as some memory mapped IO. That means that, if you
1147 have a large amount of physical memory and/or IO, not all of the
1148 memory can be "permanently mapped" by the kernel. The physical
1149 memory that is not permanently mapped is called "high memory".
1151 Depending on the selected kernel/user memory split, minimum
1152 vmalloc space and actual amount of RAM, you may not need this
1153 option which should result in a slightly faster kernel.
1158 bool "Allocate 2nd-level pagetables from highmem"
1160 depends on !OUTER_CACHE
1165 bool "Timer and CPU usage LEDs"
1166 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1167 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1168 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1169 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1170 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1171 ARCH_AT91 || ARCH_DAVINCI || \
1172 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1174 If you say Y here, the LEDs on your machine will be used
1175 to provide useful information about your current system status.
1177 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1178 be able to select which LEDs are active using the options below. If
1179 you are compiling a kernel for the EBSA-110 or the LART however, the
1180 red LED will simply flash regularly to indicate that the system is
1181 still functional. It is safe to say Y here if you have a CATS
1182 system, but the driver will do nothing.
1185 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1186 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1187 || MACH_OMAP_PERSEUS2
1189 depends on !GENERIC_CLOCKEVENTS
1190 default y if ARCH_EBSA110
1192 If you say Y here, one of the system LEDs (the green one on the
1193 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1194 will flash regularly to indicate that the system is still
1195 operational. This is mainly useful to kernel hackers who are
1196 debugging unstable kernels.
1198 The LART uses the same LED for both Timer LED and CPU usage LED
1199 functions. You may choose to use both, but the Timer LED function
1200 will overrule the CPU usage LED.
1203 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1205 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1206 || MACH_OMAP_PERSEUS2
1209 If you say Y here, the red LED will be used to give a good real
1210 time indication of CPU usage, by lighting whenever the idle task
1211 is not currently executing.
1213 The LART uses the same LED for both Timer LED and CPU usage LED
1214 functions. You may choose to use both, but the Timer LED function
1215 will overrule the CPU usage LED.
1217 config ALIGNMENT_TRAP
1219 depends on CPU_CP15_MMU
1220 default y if !ARCH_EBSA110
1222 ARM processors cannot fetch/store information which is not
1223 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1224 address divisible by 4. On 32-bit ARM processors, these non-aligned
1225 fetch/store instructions will be emulated in software if you say
1226 here, which has a severe performance impact. This is necessary for
1227 correct operation of some network protocols. With an IP-only
1228 configuration it is safe to say N, otherwise say Y.
1230 config UACCESS_WITH_MEMCPY
1231 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1232 depends on MMU && EXPERIMENTAL
1233 default y if CPU_FEROCEON
1235 Implement faster copy_to_user and clear_user methods for CPU
1236 cores where a 8-word STM instruction give significantly higher
1237 memory write throughput than a sequence of individual 32bit stores.
1239 A possible side effect is a slight increase in scheduling latency
1240 between threads sharing the same address space if they invoke
1241 such copy operations with large buffers.
1243 However, if the CPU data cache is using a write-allocate mode,
1244 this option is unlikely to provide any performance gain.
1250 # Compressed boot loader in ROM. Yes, we really want to ask about
1251 # TEXT and BSS so we preserve their values in the config files.
1252 config ZBOOT_ROM_TEXT
1253 hex "Compressed ROM boot loader base address"
1256 The physical address at which the ROM-able zImage is to be
1257 placed in the target. Platforms which normally make use of
1258 ROM-able zImage formats normally set this to a suitable
1259 value in their defconfig file.
1261 If ZBOOT_ROM is not enabled, this has no effect.
1263 config ZBOOT_ROM_BSS
1264 hex "Compressed ROM boot loader BSS address"
1267 The base address of an area of read/write memory in the target
1268 for the ROM-able zImage which must be available while the
1269 decompressor is running. It must be large enough to hold the
1270 entire decompressed kernel plus an additional 128 KiB.
1271 Platforms which normally make use of ROM-able zImage formats
1272 normally set this to a suitable value in their defconfig file.
1274 If ZBOOT_ROM is not enabled, this has no effect.
1277 bool "Compressed boot loader in ROM/flash"
1278 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1280 Say Y here if you intend to execute your compressed kernel image
1281 (zImage) directly from ROM or flash. If unsure, say N.
1284 string "Default kernel command string"
1287 On some architectures (EBSA110 and CATS), there is currently no way
1288 for the boot loader to pass arguments to the kernel. For these
1289 architectures, you should supply some command-line options at build
1290 time by entering them here. As a minimum, you should specify the
1291 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1294 bool "Kernel Execute-In-Place from ROM"
1295 depends on !ZBOOT_ROM
1297 Execute-In-Place allows the kernel to run from non-volatile storage
1298 directly addressable by the CPU, such as NOR flash. This saves RAM
1299 space since the text section of the kernel is not loaded from flash
1300 to RAM. Read-write sections, such as the data section and stack,
1301 are still copied to RAM. The XIP kernel is not compressed since
1302 it has to run directly from flash, so it will take more space to
1303 store it. The flash address used to link the kernel object files,
1304 and for storing it, is configuration dependent. Therefore, if you
1305 say Y here, you must know the proper physical address where to
1306 store the kernel image depending on your own flash memory usage.
1308 Also note that the make target becomes "make xipImage" rather than
1309 "make zImage" or "make Image". The final kernel binary to put in
1310 ROM memory will be arch/arm/boot/xipImage.
1314 config XIP_PHYS_ADDR
1315 hex "XIP Kernel Physical Location"
1316 depends on XIP_KERNEL
1317 default "0x00080000"
1319 This is the physical address in your flash memory the kernel will
1320 be linked for and stored to. This address is dependent on your
1324 bool "Kexec system call (EXPERIMENTAL)"
1325 depends on EXPERIMENTAL
1327 kexec is a system call that implements the ability to shutdown your
1328 current kernel, and to start another kernel. It is like a reboot
1329 but it is independent of the system firmware. And like a reboot
1330 you can start any kernel with it, not just Linux.
1332 It is an ongoing process to be certain the hardware in a machine
1333 is properly shutdown, so do not be surprised if this code does not
1334 initially work for you. It may help to enable device hotplugging
1338 bool "Export atags in procfs"
1342 Should the atags used to boot the kernel be exported in an "atags"
1343 file in procfs. Useful with kexec.
1347 menu "CPU Power Management"
1351 source "drivers/cpufreq/Kconfig"
1353 config CPU_FREQ_SA1100
1355 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1358 config CPU_FREQ_SA1110
1360 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1363 config CPU_FREQ_INTEGRATOR
1364 tristate "CPUfreq driver for ARM Integrator CPUs"
1365 depends on ARCH_INTEGRATOR && CPU_FREQ
1368 This enables the CPUfreq driver for ARM Integrator CPUs.
1370 For details, take a look at <file:Documentation/cpu-freq>.
1376 depends on CPU_FREQ && ARCH_PXA && PXA25x
1378 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1380 config CPU_FREQ_S3C64XX
1381 bool "CPUfreq support for Samsung S3C64XX CPUs"
1382 depends on CPU_FREQ && CPU_S3C6410
1387 Internal configuration node for common cpufreq on Samsung SoC
1389 config CPU_FREQ_S3C24XX
1390 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1391 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1394 This enables the CPUfreq driver for the Samsung S3C24XX family
1397 For details, take a look at <file:Documentation/cpu-freq>.
1401 config CPU_FREQ_S3C24XX_PLL
1402 bool "Support CPUfreq changing of PLL frequency"
1403 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1405 Compile in support for changing the PLL frequency from the
1406 S3C24XX series CPUfreq driver. The PLL takes time to settle
1407 after a frequency change, so by default it is not enabled.
1409 This also means that the PLL tables for the selected CPU(s) will
1410 be built which may increase the size of the kernel image.
1412 config CPU_FREQ_S3C24XX_DEBUG
1413 bool "Debug CPUfreq Samsung driver core"
1414 depends on CPU_FREQ_S3C24XX
1416 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1418 config CPU_FREQ_S3C24XX_IODEBUG
1419 bool "Debug CPUfreq Samsung driver IO timing"
1420 depends on CPU_FREQ_S3C24XX
1422 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1424 config CPU_FREQ_S3C24XX_DEBUGFS
1425 bool "Export debugfs for CPUFreq"
1426 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1428 Export status information via debugfs.
1432 source "drivers/cpuidle/Kconfig"
1436 menu "Floating point emulation"
1438 comment "At least one emulation must be selected"
1441 bool "NWFPE math emulation"
1442 depends on !AEABI || OABI_COMPAT
1444 Say Y to include the NWFPE floating point emulator in the kernel.
1445 This is necessary to run most binaries. Linux does not currently
1446 support floating point hardware so you need to say Y here even if
1447 your machine has an FPA or floating point co-processor podule.
1449 You may say N here if you are going to load the Acorn FPEmulator
1450 early in the bootup.
1453 bool "Support extended precision"
1454 depends on FPE_NWFPE
1456 Say Y to include 80-bit support in the kernel floating-point
1457 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1458 Note that gcc does not generate 80-bit operations by default,
1459 so in most cases this option only enlarges the size of the
1460 floating point emulator without any good reason.
1462 You almost surely want to say N here.
1465 bool "FastFPE math emulation (EXPERIMENTAL)"
1466 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1468 Say Y here to include the FAST floating point emulator in the kernel.
1469 This is an experimental much faster emulator which now also has full
1470 precision for the mantissa. It does not support any exceptions.
1471 It is very simple, and approximately 3-6 times faster than NWFPE.
1473 It should be sufficient for most programs. It may be not suitable
1474 for scientific calculations, but you have to check this for yourself.
1475 If you do not feel you need a faster FP emulation you should better
1479 bool "VFP-format floating point maths"
1480 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1482 Say Y to include VFP support code in the kernel. This is needed
1483 if your hardware includes a VFP unit.
1485 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1486 release notes and additional status information.
1488 Say N if your target does not have VFP hardware.
1496 bool "Advanced SIMD (NEON) Extension support"
1497 depends on VFPv3 && CPU_V7
1499 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1504 menu "Userspace binary formats"
1506 source "fs/Kconfig.binfmt"
1509 tristate "RISC OS personality"
1512 Say Y here to include the kernel code necessary if you want to run
1513 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1514 experimental; if this sounds frightening, say N and sleep in peace.
1515 You can also say M here to compile this support as a module (which
1516 will be called arthur).
1520 menu "Power management options"
1522 source "kernel/power/Kconfig"
1524 config ARCH_SUSPEND_POSSIBLE
1529 source "net/Kconfig"
1531 source "drivers/Kconfig"
1535 source "arch/arm/Kconfig.debug"
1537 source "security/Kconfig"
1539 source "crypto/Kconfig"
1541 source "lib/Kconfig"