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
15 select GENERIC_ATOMIC64 if (!CPU_32v6K)
18 select HAVE_KPROBES if (!XIP_KERNEL)
19 select HAVE_KRETPROBES if (HAVE_KPROBES)
20 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
21 select HAVE_GENERIC_DMA_COHERENT
22 select HAVE_KERNEL_GZIP
23 select HAVE_KERNEL_LZO
24 select HAVE_KERNEL_LZMA
25 select HAVE_PERF_EVENTS
26 select PERF_USE_VMALLOC
28 The ARM series is a line of low-power-consumption RISC chip designs
29 licensed by ARM Ltd and targeted at embedded applications and
30 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
31 manufactured, but legacy ARM-based PC hardware remains popular in
32 Europe. There is an ARM Linux project with a web page at
33 <http://www.arm.linux.org.uk/>.
38 config SYS_SUPPORTS_APM_EMULATION
48 config ARCH_USES_GETTIMEOFFSET
52 config GENERIC_CLOCKEVENTS
55 config GENERIC_CLOCKEVENTS_BROADCAST
57 depends on GENERIC_CLOCKEVENTS
58 default y if SMP && !LOCAL_TIMERS
62 select GENERIC_ALLOCATOR
73 The Extended Industry Standard Architecture (EISA) bus was
74 developed as an open alternative to the IBM MicroChannel bus.
76 The EISA bus provided some of the features of the IBM MicroChannel
77 bus while maintaining backward compatibility with cards made for
78 the older ISA bus. The EISA bus saw limited use between 1988 and
79 1995 when it was made obsolete by the PCI bus.
81 Say Y here if you are building a kernel for an EISA-based machine.
91 MicroChannel Architecture is found in some IBM PS/2 machines and
92 laptops. It is a bus system similar to PCI or ISA. See
93 <file:Documentation/mca.txt> (and especially the web page given
94 there) before attempting to build an MCA bus kernel.
96 config GENERIC_HARDIRQS
100 config STACKTRACE_SUPPORT
104 config HAVE_LATENCYTOP_SUPPORT
109 config LOCKDEP_SUPPORT
113 config TRACE_IRQFLAGS_SUPPORT
117 config HARDIRQS_SW_RESEND
121 config GENERIC_IRQ_PROBE
125 config GENERIC_LOCKBREAK
128 depends on SMP && PREEMPT
130 config RWSEM_GENERIC_SPINLOCK
134 config RWSEM_XCHGADD_ALGORITHM
137 config ARCH_HAS_ILOG2_U32
140 config ARCH_HAS_ILOG2_U64
143 config ARCH_HAS_CPUFREQ
146 Internal node to signify that the ARCH has CPUFREQ support
147 and that the relevant menu configurations are displayed for
150 config GENERIC_HWEIGHT
154 config GENERIC_CALIBRATE_DELAY
158 config ARCH_MAY_HAVE_PC_FDC
164 config NEED_DMA_MAP_STATE
167 config GENERIC_ISA_DMA
176 config GENERIC_HARDIRQS_NO__DO_IRQ
179 config ARM_L1_CACHE_SHIFT_6
182 Setting ARM L1 cache line size to 64 Bytes.
186 config OPROFILE_ARMV6
188 depends on CPU_V6 && !SMP
189 select OPROFILE_ARM11_CORE
191 config OPROFILE_MPCORE
193 depends on CPU_V6 && SMP
194 select OPROFILE_ARM11_CORE
196 config OPROFILE_ARM11_CORE
199 config OPROFILE_ARMV7
201 depends on CPU_V7 && !SMP
208 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
209 default DRAM_BASE if REMAP_VECTORS_TO_RAM
212 The base address of exception vectors.
214 source "init/Kconfig"
216 source "kernel/Kconfig.freezer"
221 bool "MMU-based Paged Memory Management Support"
224 Select if you want MMU-based virtualised addressing space
225 support by paged memory management. If unsure, say 'Y'.
228 # The "ARM system type" choice list is ordered alphabetically by option
229 # text. Please add new entries in the option alphabetic order.
232 prompt "ARM system type"
233 default ARCH_VERSATILE
236 bool "Agilent AAEC-2000 based"
240 select ARCH_USES_GETTIMEOFFSET
242 This enables support for systems based on the Agilent AAEC-2000
244 config ARCH_INTEGRATOR
245 bool "ARM Ltd. Integrator family"
247 select ARCH_HAS_CPUFREQ
251 Support for ARM's Integrator platform.
254 bool "ARM Ltd. RealView family"
259 select GENERIC_CLOCKEVENTS
260 select ARCH_WANT_OPTIONAL_GPIOLIB
262 This enables support for ARM Ltd RealView boards.
264 config ARCH_VERSATILE
265 bool "ARM Ltd. Versatile family"
271 select GENERIC_CLOCKEVENTS
272 select ARCH_WANT_OPTIONAL_GPIOLIB
274 This enables support for ARM Ltd Versatile board.
279 select ARCH_REQUIRE_GPIOLIB
281 select ARCH_USES_GETTIMEOFFSET
283 This enables support for systems based on the Atmel AT91RM9200,
284 AT91SAM9 and AT91CAP9 processors.
287 bool "Broadcom BCMRING"
293 select GENERIC_CLOCKEVENTS
294 select ARCH_WANT_OPTIONAL_GPIOLIB
296 Support for Broadcom's BCMRing platform.
299 bool "Cirrus Logic CLPS711x/EP721x-based"
301 select ARCH_USES_GETTIMEOFFSET
303 Support for Cirrus Logic 711x/721x based boards.
306 bool "Cortina Systems Gemini"
309 select ARCH_REQUIRE_GPIOLIB
310 select ARCH_USES_GETTIMEOFFSET
312 Support for the Cortina Systems Gemini family SoCs
319 select ARCH_USES_GETTIMEOFFSET
321 This is an evaluation board for the StrongARM processor available
322 from Digital. It has limited hardware on-board, including an
323 Ethernet interface, two PCMCIA sockets, two serial ports and a
333 select ARCH_REQUIRE_GPIOLIB
334 select ARCH_HAS_HOLES_MEMORYMODEL
335 select ARCH_USES_GETTIMEOFFSET
337 This enables support for the Cirrus EP93xx series of CPUs.
339 config ARCH_FOOTBRIDGE
343 select ARCH_USES_GETTIMEOFFSET
345 Support for systems based on the DC21285 companion chip
346 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
349 bool "Freescale MXC/iMX-based"
351 select GENERIC_CLOCKEVENTS
352 select ARCH_REQUIRE_GPIOLIB
355 Support for Freescale MXC/iMX-based family of processors
358 bool "Freescale STMP3xxx"
361 select ARCH_REQUIRE_GPIOLIB
363 select GENERIC_CLOCKEVENTS
365 select USB_ARCH_HAS_EHCI
367 Support for systems based on the Freescale 3xxx CPUs.
370 bool "Hilscher NetX based"
373 select GENERIC_CLOCKEVENTS
376 This enables support for systems based on the Hilscher NetX Soc
379 bool "Hynix HMS720x-based"
382 select ARCH_USES_GETTIMEOFFSET
384 This enables support for systems based on the Hynix HMS720x
392 select ARCH_SUPPORTS_MSI
395 Support for Intel's IOP13XX (XScale) family of processors.
404 select ARCH_REQUIRE_GPIOLIB
406 Support for Intel's 80219 and IOP32X (XScale) family of
416 select ARCH_REQUIRE_GPIOLIB
418 Support for Intel's IOP33X (XScale) family of processors.
425 select ARCH_USES_GETTIMEOFFSET
427 Support for Intel's IXP23xx (XScale) family of processors.
430 bool "IXP2400/2800-based"
434 select ARCH_USES_GETTIMEOFFSET
436 Support for Intel's IXP2400/2800 (XScale) family of processors.
444 select GENERIC_CLOCKEVENTS
445 select DMABOUNCE if PCI
447 Support for Intel's IXP4XX (XScale) family of processors.
453 select ARCH_USES_GETTIMEOFFSET
455 Say Y here if you intend to run this kernel on a LinkUp Systems
456 L7200 Software Development Board which uses an ARM720T processor.
457 Information on this board can be obtained at:
459 <http://www.linkupsys.com/>
461 If you have any questions or comments about the Linux kernel port
462 to this board, send e-mail to <sjhill@cotw.com>.
468 select ARCH_REQUIRE_GPIOLIB
470 select GENERIC_CLOCKEVENTS
473 Support for the Marvell Dove SoC 88AP510
476 bool "Marvell Kirkwood"
480 select ARCH_REQUIRE_GPIOLIB
482 select GENERIC_CLOCKEVENTS
485 Support for the following Marvell Kirkwood series SoCs:
486 88F6180, 88F6192 and 88F6281.
489 bool "Marvell Loki (88RC8480)"
492 select GENERIC_CLOCKEVENTS
495 Support for the Marvell Loki (88RC8480) SoC.
498 bool "Marvell MV78xx0"
502 select ARCH_REQUIRE_GPIOLIB
504 select GENERIC_CLOCKEVENTS
507 Support for the following Marvell MV78xx0 series SoCs:
516 select ARCH_REQUIRE_GPIOLIB
518 select GENERIC_CLOCKEVENTS
521 Support for the following Marvell Orion 5x series SoCs:
522 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
523 Orion-2 (5281), Orion-1-90 (6183).
526 bool "Marvell PXA168/910/MMP2"
529 select ARCH_REQUIRE_GPIOLIB
532 select GENERIC_CLOCKEVENTS
536 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
539 bool "Micrel/Kendin KS8695"
542 select ARCH_REQUIRE_GPIOLIB
543 select ARCH_USES_GETTIMEOFFSET
545 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
546 System-on-Chip devices.
549 bool "NetSilicon NS9xxx"
553 select GENERIC_CLOCKEVENTS
556 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
559 <http://www.digi.com/products/microprocessors/index.jsp>
562 bool "Nuvoton W90X900 CPU"
564 select ARCH_REQUIRE_GPIOLIB
568 select GENERIC_CLOCKEVENTS
570 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
571 At present, the w90x900 has been renamed nuc900, regarding
572 the ARM series product line, you can login the following
573 link address to know more.
575 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
576 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
579 bool "Nuvoton NUC93X CPU"
583 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
584 low-power and high performance MPEG-4/JPEG multimedia controller chip.
587 bool "Philips Nexperia PNX4008 Mobile"
590 select ARCH_USES_GETTIMEOFFSET
592 This enables support for Philips PNX4008 mobile platform.
595 bool "PXA2xx/PXA3xx-based"
598 select ARCH_HAS_CPUFREQ
601 select ARCH_REQUIRE_GPIOLIB
603 select GENERIC_CLOCKEVENTS
607 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
613 select GENERIC_CLOCKEVENTS
615 Support for Qualcomm MSM7K based systems. This runs on the ARM11
616 apps processor of the MSM7K and depends on a shared memory
617 interface to the ARM9 modem processor which runs the baseband stack
618 and controls some vital subsystems (clock and power control, etc).
621 bool "Renesas SH-Mobile"
623 Support for Renesas's SH-Mobile ARM platforms
630 select ARCH_MAY_HAVE_PC_FDC
631 select HAVE_PATA_PLATFORM
634 select ARCH_SPARSEMEM_ENABLE
635 select ARCH_USES_GETTIMEOFFSET
637 On the Acorn Risc-PC, Linux can support the internal IDE disk and
638 CD-ROM interface, serial and parallel port, and the floppy drive.
644 select ARCH_SPARSEMEM_ENABLE
646 select ARCH_HAS_CPUFREQ
650 select GENERIC_CLOCKEVENTS
653 select ARCH_REQUIRE_GPIOLIB
655 Support for StrongARM 11x0 based boards.
658 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
660 select ARCH_HAS_CPUFREQ
662 select ARCH_USES_GETTIMEOFFSET
664 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
665 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
666 the Samsung SMDK2410 development board (and derivatives).
669 bool "Samsung S3C64XX"
676 select ARCH_USES_GETTIMEOFFSET
677 select ARCH_HAS_CPUFREQ
678 select ARCH_REQUIRE_GPIOLIB
679 select SAMSUNG_CLKSRC
680 select SAMSUNG_IRQ_VIC_TIMER
681 select SAMSUNG_IRQ_UART
682 select S3C_GPIO_TRACK
683 select S3C_GPIO_PULL_UPDOWN
684 select S3C_GPIO_CFG_S3C24XX
685 select S3C_GPIO_CFG_S3C64XX
687 select USB_ARCH_HAS_OHCI
688 select SAMSUNG_GPIOLIB_4BIT
690 Samsung S3C64XX series based systems
693 bool "Samsung S5P6440"
698 Samsung S5P6440 CPU based systems
701 bool "Samsung S5P6442"
706 Samsung S5P6442 CPU based systems
709 bool "Samsung S5PC1XX"
713 select ARM_L1_CACHE_SHIFT_6
715 Samsung S5PC1XX series based systems
718 bool "Samsung S5PV210/S5PC110"
722 select ARM_L1_CACHE_SHIFT_6
724 Samsung S5PV210/S5PC110 series based systems
733 select ARCH_USES_GETTIMEOFFSET
735 Support for the StrongARM based Digital DNARD machine, also known
736 as "Shark" (<http://www.shark-linux.de/shark.html>).
741 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
742 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
743 select ARCH_USES_GETTIMEOFFSET
745 Say Y here for systems based on one of the Sharp LH7A40X
746 System on a Chip processors. These CPUs include an ARM922T
747 core with a wide array of integrated devices for
748 hand-held and low-power applications.
751 bool "ST-Ericsson U300 Series"
758 select GENERIC_CLOCKEVENTS
762 Support for ST-Ericsson U300 series mobile platforms.
765 bool "ST-Ericsson U8500 Series"
769 select GENERIC_CLOCKEVENTS
772 Support for ST-Ericsson's Ux500 architecture
775 bool "STMicroelectronics Nomadik"
781 select GENERIC_CLOCKEVENTS
783 select ARCH_REQUIRE_GPIOLIB
785 Support for the Nomadik platform by ST-Ericsson
791 select GENERIC_CLOCKEVENTS
793 select ARCH_REQUIRE_GPIOLIB
797 select GENERIC_ALLOCATOR
798 select ARCH_HAS_HOLES_MEMORYMODEL
800 Support for TI's DaVinci platform.
806 select ARCH_REQUIRE_GPIOLIB
807 select ARCH_HAS_CPUFREQ
809 select GENERIC_CLOCKEVENTS
810 select ARCH_HAS_HOLES_MEMORYMODEL
812 Support for TI's OMAP platform (OMAP1 and OMAP2).
817 # This is sorted alphabetically by mach-* pathname. However, plat-*
818 # Kconfigs may be included either alphabetically (according to the
819 # plat- suffix) or along side the corresponding mach-* source.
821 source "arch/arm/mach-aaec2000/Kconfig"
823 source "arch/arm/mach-at91/Kconfig"
825 source "arch/arm/mach-bcmring/Kconfig"
827 source "arch/arm/mach-clps711x/Kconfig"
829 source "arch/arm/mach-davinci/Kconfig"
831 source "arch/arm/mach-dove/Kconfig"
833 source "arch/arm/mach-ep93xx/Kconfig"
835 source "arch/arm/mach-footbridge/Kconfig"
837 source "arch/arm/mach-gemini/Kconfig"
839 source "arch/arm/mach-h720x/Kconfig"
841 source "arch/arm/mach-integrator/Kconfig"
843 source "arch/arm/mach-iop32x/Kconfig"
845 source "arch/arm/mach-iop33x/Kconfig"
847 source "arch/arm/mach-iop13xx/Kconfig"
849 source "arch/arm/mach-ixp4xx/Kconfig"
851 source "arch/arm/mach-ixp2000/Kconfig"
853 source "arch/arm/mach-ixp23xx/Kconfig"
855 source "arch/arm/mach-kirkwood/Kconfig"
857 source "arch/arm/mach-ks8695/Kconfig"
859 source "arch/arm/mach-lh7a40x/Kconfig"
861 source "arch/arm/mach-loki/Kconfig"
863 source "arch/arm/mach-msm/Kconfig"
865 source "arch/arm/mach-mv78xx0/Kconfig"
867 source "arch/arm/plat-mxc/Kconfig"
869 source "arch/arm/mach-netx/Kconfig"
871 source "arch/arm/mach-nomadik/Kconfig"
872 source "arch/arm/plat-nomadik/Kconfig"
874 source "arch/arm/mach-ns9xxx/Kconfig"
876 source "arch/arm/mach-nuc93x/Kconfig"
878 source "arch/arm/plat-omap/Kconfig"
880 source "arch/arm/mach-omap1/Kconfig"
882 source "arch/arm/mach-omap2/Kconfig"
884 source "arch/arm/mach-orion5x/Kconfig"
886 source "arch/arm/mach-pxa/Kconfig"
887 source "arch/arm/plat-pxa/Kconfig"
889 source "arch/arm/mach-mmp/Kconfig"
891 source "arch/arm/mach-realview/Kconfig"
893 source "arch/arm/mach-sa1100/Kconfig"
895 source "arch/arm/plat-samsung/Kconfig"
896 source "arch/arm/plat-s3c24xx/Kconfig"
897 source "arch/arm/plat-s5p/Kconfig"
898 source "arch/arm/plat-s5pc1xx/Kconfig"
901 source "arch/arm/mach-s3c2400/Kconfig"
902 source "arch/arm/mach-s3c2410/Kconfig"
903 source "arch/arm/mach-s3c2412/Kconfig"
904 source "arch/arm/mach-s3c2440/Kconfig"
905 source "arch/arm/mach-s3c2443/Kconfig"
909 source "arch/arm/mach-s3c64xx/Kconfig"
912 source "arch/arm/mach-s5p6440/Kconfig"
914 source "arch/arm/mach-s5p6442/Kconfig"
917 source "arch/arm/mach-s5pc100/Kconfig"
920 source "arch/arm/mach-s5pv210/Kconfig"
922 source "arch/arm/mach-shmobile/Kconfig"
924 source "arch/arm/plat-stmp3xxx/Kconfig"
926 source "arch/arm/mach-u300/Kconfig"
928 source "arch/arm/mach-ux500/Kconfig"
930 source "arch/arm/mach-versatile/Kconfig"
932 source "arch/arm/mach-w90x900/Kconfig"
934 # Definitions to make life easier
940 select GENERIC_CLOCKEVENTS
949 source arch/arm/mm/Kconfig
952 bool "Enable iWMMXt support"
953 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
954 default y if PXA27x || PXA3xx || ARCH_MMP
956 Enable support for iWMMXt context switching at run time if
957 running on a CPU that supports it.
959 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
962 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
966 depends on CPU_V6 || CPU_V7 || XSCALE_PMU
971 source "arch/arm/Kconfig-nommu"
974 config ARM_ERRATA_411920
975 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
976 depends on CPU_V6 && !SMP
978 Invalidation of the Instruction Cache operation can
979 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
980 It does not affect the MPCore. This option enables the ARM Ltd.
981 recommended workaround.
983 config ARM_ERRATA_430973
984 bool "ARM errata: Stale prediction on replaced interworking branch"
987 This option enables the workaround for the 430973 Cortex-A8
988 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
989 interworking branch is replaced with another code sequence at the
990 same virtual address, whether due to self-modifying code or virtual
991 to physical address re-mapping, Cortex-A8 does not recover from the
992 stale interworking branch prediction. This results in Cortex-A8
993 executing the new code sequence in the incorrect ARM or Thumb state.
994 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
995 and also flushes the branch target cache at every context switch.
996 Note that setting specific bits in the ACTLR register may not be
997 available in non-secure mode.
999 config ARM_ERRATA_458693
1000 bool "ARM errata: Processor deadlock when a false hazard is created"
1003 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1004 erratum. For very specific sequences of memory operations, it is
1005 possible for a hazard condition intended for a cache line to instead
1006 be incorrectly associated with a different cache line. This false
1007 hazard might then cause a processor deadlock. The workaround enables
1008 the L1 caching of the NEON accesses and disables the PLD instruction
1009 in the ACTLR register. Note that setting specific bits in the ACTLR
1010 register may not be available in non-secure mode.
1012 config ARM_ERRATA_460075
1013 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1016 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1017 erratum. Any asynchronous access to the L2 cache may encounter a
1018 situation in which recent store transactions to the L2 cache are lost
1019 and overwritten with stale memory contents from external memory. The
1020 workaround disables the write-allocate mode for the L2 cache via the
1021 ACTLR register. Note that setting specific bits in the ACTLR register
1022 may not be available in non-secure mode.
1024 config PL310_ERRATA_588369
1025 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1026 depends on CACHE_L2X0 && ARCH_OMAP4
1028 The PL310 L2 cache controller implements three types of Clean &
1029 Invalidate maintenance operations: by Physical Address
1030 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1031 They are architecturally defined to behave as the execution of a
1032 clean operation followed immediately by an invalidate operation,
1033 both performing to the same memory location. This functionality
1034 is not correctly implemented in PL310 as clean lines are not
1035 invalidated as a result of these operations. Note that this errata
1036 uses Texas Instrument's secure monitor api.
1039 source "arch/arm/common/Kconfig"
1041 config FORCE_MAX_ZONEORDER
1054 Find out whether you have ISA slots on your motherboard. ISA is the
1055 name of a bus system, i.e. the way the CPU talks to the other stuff
1056 inside your box. Other bus systems are PCI, EISA, MicroChannel
1057 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1058 newer boards don't support it. If you have ISA, say Y, otherwise N.
1060 # Select ISA DMA controller support
1065 # Select ISA DMA interface
1070 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1072 Find out whether you have a PCI motherboard. PCI is the name of a
1073 bus system, i.e. the way the CPU talks to the other stuff inside
1074 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1075 VESA. If you have PCI, say Y, otherwise N.
1084 # Select the host bridge type
1085 config PCI_HOST_VIA82C505
1087 depends on PCI && ARCH_SHARK
1090 config PCI_HOST_ITE8152
1092 depends on PCI && MACH_ARMCORE
1096 source "drivers/pci/Kconfig"
1098 source "drivers/pcmcia/Kconfig"
1102 menu "Kernel Features"
1104 source "kernel/time/Kconfig"
1107 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1108 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1109 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1110 depends on GENERIC_CLOCKEVENTS
1111 select USE_GENERIC_SMP_HELPERS
1112 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1114 This enables support for systems with more than one CPU. If you have
1115 a system with only one CPU, like most personal computers, say N. If
1116 you have a system with more than one CPU, say Y.
1118 If you say N here, the kernel will run on single and multiprocessor
1119 machines, but will use only one CPU of a multiprocessor machine. If
1120 you say Y here, the kernel will run on many, but not all, single
1121 processor machines. On a single processor machine, the kernel will
1122 run faster if you say N here.
1124 See also <file:Documentation/i386/IO-APIC.txt>,
1125 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1126 <http://www.linuxdoc.org/docs.html#howto>.
1128 If you don't know what to do here, say N.
1134 This option enables support for the ARM system coherency unit
1140 This options enables support for the ARM timer and watchdog unit
1143 prompt "Memory split"
1146 Select the desired split between kernel and user memory.
1148 If you are not absolutely sure what you are doing, leave this
1152 bool "3G/1G user/kernel split"
1154 bool "2G/2G user/kernel split"
1156 bool "1G/3G user/kernel split"
1161 default 0x40000000 if VMSPLIT_1G
1162 default 0x80000000 if VMSPLIT_2G
1166 int "Maximum number of CPUs (2-32)"
1172 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1173 depends on SMP && HOTPLUG && EXPERIMENTAL
1175 Say Y here to experiment with turning CPUs off and on. CPUs
1176 can be controlled through /sys/devices/system/cpu.
1179 bool "Use local timer interrupts"
1180 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1181 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1183 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1185 Enable support for local timers on SMP platforms, rather then the
1186 legacy IPI broadcast method. Local timers allows the system
1187 accounting to be spread across the timer interval, preventing a
1188 "thundering herd" at every timer tick.
1190 source kernel/Kconfig.preempt
1194 default 128 if ARCH_L7200
1195 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1196 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1197 default AT91_TIMER_HZ if ARCH_AT91
1200 config THUMB2_KERNEL
1201 bool "Compile the kernel in Thumb-2 mode"
1202 depends on CPU_V7 && EXPERIMENTAL
1204 select ARM_ASM_UNIFIED
1206 By enabling this option, the kernel will be compiled in
1207 Thumb-2 mode. A compiler/assembler that understand the unified
1208 ARM-Thumb syntax is needed.
1212 config ARM_ASM_UNIFIED
1216 bool "Use the ARM EABI to compile the kernel"
1218 This option allows for the kernel to be compiled using the latest
1219 ARM ABI (aka EABI). This is only useful if you are using a user
1220 space environment that is also compiled with EABI.
1222 Since there are major incompatibilities between the legacy ABI and
1223 EABI, especially with regard to structure member alignment, this
1224 option also changes the kernel syscall calling convention to
1225 disambiguate both ABIs and allow for backward compatibility support
1226 (selected with CONFIG_OABI_COMPAT).
1228 To use this you need GCC version 4.0.0 or later.
1231 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1232 depends on AEABI && EXPERIMENTAL
1235 This option preserves the old syscall interface along with the
1236 new (ARM EABI) one. It also provides a compatibility layer to
1237 intercept syscalls that have structure arguments which layout
1238 in memory differs between the legacy ABI and the new ARM EABI
1239 (only for non "thumb" binaries). This option adds a tiny
1240 overhead to all syscalls and produces a slightly larger kernel.
1241 If you know you'll be using only pure EABI user space then you
1242 can say N here. If this option is not selected and you attempt
1243 to execute a legacy ABI binary then the result will be
1244 UNPREDICTABLE (in fact it can be predicted that it won't work
1245 at all). If in doubt say Y.
1247 config ARCH_HAS_HOLES_MEMORYMODEL
1250 # Discontigmem is deprecated
1251 config ARCH_DISCONTIGMEM_ENABLE
1254 config ARCH_SPARSEMEM_ENABLE
1257 config ARCH_SPARSEMEM_DEFAULT
1258 def_bool ARCH_SPARSEMEM_ENABLE
1260 config ARCH_SELECT_MEMORY_MODEL
1261 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1265 default "4" if ARCH_LH7A40X
1267 depends on NEED_MULTIPLE_NODES
1270 bool "High Memory Support (EXPERIMENTAL)"
1271 depends on MMU && EXPERIMENTAL
1273 The address space of ARM processors is only 4 Gigabytes large
1274 and it has to accommodate user address space, kernel address
1275 space as well as some memory mapped IO. That means that, if you
1276 have a large amount of physical memory and/or IO, not all of the
1277 memory can be "permanently mapped" by the kernel. The physical
1278 memory that is not permanently mapped is called "high memory".
1280 Depending on the selected kernel/user memory split, minimum
1281 vmalloc space and actual amount of RAM, you may not need this
1282 option which should result in a slightly faster kernel.
1287 bool "Allocate 2nd-level pagetables from highmem"
1289 depends on !OUTER_CACHE
1291 config HW_PERF_EVENTS
1292 bool "Enable hardware performance counter support for perf events"
1293 depends on PERF_EVENTS && CPU_HAS_PMU && (CPU_V6 || CPU_V7)
1296 Enable hardware performance counter support for perf events. If
1297 disabled, perf events will use software events only.
1302 bool "Timer and CPU usage LEDs"
1303 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1304 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1305 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1306 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1307 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1308 ARCH_AT91 || ARCH_DAVINCI || \
1309 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1311 If you say Y here, the LEDs on your machine will be used
1312 to provide useful information about your current system status.
1314 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1315 be able to select which LEDs are active using the options below. If
1316 you are compiling a kernel for the EBSA-110 or the LART however, the
1317 red LED will simply flash regularly to indicate that the system is
1318 still functional. It is safe to say Y here if you have a CATS
1319 system, but the driver will do nothing.
1322 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1323 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1324 || MACH_OMAP_PERSEUS2
1326 depends on !GENERIC_CLOCKEVENTS
1327 default y if ARCH_EBSA110
1329 If you say Y here, one of the system LEDs (the green one on the
1330 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1331 will flash regularly to indicate that the system is still
1332 operational. This is mainly useful to kernel hackers who are
1333 debugging unstable kernels.
1335 The LART uses the same LED for both Timer LED and CPU usage LED
1336 functions. You may choose to use both, but the Timer LED function
1337 will overrule the CPU usage LED.
1340 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1342 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1343 || MACH_OMAP_PERSEUS2
1346 If you say Y here, the red LED will be used to give a good real
1347 time indication of CPU usage, by lighting whenever the idle task
1348 is not currently executing.
1350 The LART uses the same LED for both Timer LED and CPU usage LED
1351 functions. You may choose to use both, but the Timer LED function
1352 will overrule the CPU usage LED.
1354 config ALIGNMENT_TRAP
1356 depends on CPU_CP15_MMU
1357 default y if !ARCH_EBSA110
1358 select HAVE_PROC_CPU if PROC_FS
1360 ARM processors cannot fetch/store information which is not
1361 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1362 address divisible by 4. On 32-bit ARM processors, these non-aligned
1363 fetch/store instructions will be emulated in software if you say
1364 here, which has a severe performance impact. This is necessary for
1365 correct operation of some network protocols. With an IP-only
1366 configuration it is safe to say N, otherwise say Y.
1368 config UACCESS_WITH_MEMCPY
1369 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1370 depends on MMU && EXPERIMENTAL
1371 default y if CPU_FEROCEON
1373 Implement faster copy_to_user and clear_user methods for CPU
1374 cores where a 8-word STM instruction give significantly higher
1375 memory write throughput than a sequence of individual 32bit stores.
1377 A possible side effect is a slight increase in scheduling latency
1378 between threads sharing the same address space if they invoke
1379 such copy operations with large buffers.
1381 However, if the CPU data cache is using a write-allocate mode,
1382 this option is unlikely to provide any performance gain.
1388 # Compressed boot loader in ROM. Yes, we really want to ask about
1389 # TEXT and BSS so we preserve their values in the config files.
1390 config ZBOOT_ROM_TEXT
1391 hex "Compressed ROM boot loader base address"
1394 The physical address at which the ROM-able zImage is to be
1395 placed in the target. Platforms which normally make use of
1396 ROM-able zImage formats normally set this to a suitable
1397 value in their defconfig file.
1399 If ZBOOT_ROM is not enabled, this has no effect.
1401 config ZBOOT_ROM_BSS
1402 hex "Compressed ROM boot loader BSS address"
1405 The base address of an area of read/write memory in the target
1406 for the ROM-able zImage which must be available while the
1407 decompressor is running. It must be large enough to hold the
1408 entire decompressed kernel plus an additional 128 KiB.
1409 Platforms which normally make use of ROM-able zImage formats
1410 normally set this to a suitable value in their defconfig file.
1412 If ZBOOT_ROM is not enabled, this has no effect.
1415 bool "Compressed boot loader in ROM/flash"
1416 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1418 Say Y here if you intend to execute your compressed kernel image
1419 (zImage) directly from ROM or flash. If unsure, say N.
1422 string "Default kernel command string"
1425 On some architectures (EBSA110 and CATS), there is currently no way
1426 for the boot loader to pass arguments to the kernel. For these
1427 architectures, you should supply some command-line options at build
1428 time by entering them here. As a minimum, you should specify the
1429 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1432 bool "Kernel Execute-In-Place from ROM"
1433 depends on !ZBOOT_ROM
1435 Execute-In-Place allows the kernel to run from non-volatile storage
1436 directly addressable by the CPU, such as NOR flash. This saves RAM
1437 space since the text section of the kernel is not loaded from flash
1438 to RAM. Read-write sections, such as the data section and stack,
1439 are still copied to RAM. The XIP kernel is not compressed since
1440 it has to run directly from flash, so it will take more space to
1441 store it. The flash address used to link the kernel object files,
1442 and for storing it, is configuration dependent. Therefore, if you
1443 say Y here, you must know the proper physical address where to
1444 store the kernel image depending on your own flash memory usage.
1446 Also note that the make target becomes "make xipImage" rather than
1447 "make zImage" or "make Image". The final kernel binary to put in
1448 ROM memory will be arch/arm/boot/xipImage.
1452 config XIP_PHYS_ADDR
1453 hex "XIP Kernel Physical Location"
1454 depends on XIP_KERNEL
1455 default "0x00080000"
1457 This is the physical address in your flash memory the kernel will
1458 be linked for and stored to. This address is dependent on your
1462 bool "Kexec system call (EXPERIMENTAL)"
1463 depends on EXPERIMENTAL
1465 kexec is a system call that implements the ability to shutdown your
1466 current kernel, and to start another kernel. It is like a reboot
1467 but it is independent of the system firmware. And like a reboot
1468 you can start any kernel with it, not just Linux.
1470 It is an ongoing process to be certain the hardware in a machine
1471 is properly shutdown, so do not be surprised if this code does not
1472 initially work for you. It may help to enable device hotplugging
1476 bool "Export atags in procfs"
1480 Should the atags used to boot the kernel be exported in an "atags"
1481 file in procfs. Useful with kexec.
1485 menu "CPU Power Management"
1489 source "drivers/cpufreq/Kconfig"
1491 config CPU_FREQ_SA1100
1494 config CPU_FREQ_SA1110
1497 config CPU_FREQ_INTEGRATOR
1498 tristate "CPUfreq driver for ARM Integrator CPUs"
1499 depends on ARCH_INTEGRATOR && CPU_FREQ
1502 This enables the CPUfreq driver for ARM Integrator CPUs.
1504 For details, take a look at <file:Documentation/cpu-freq>.
1510 depends on CPU_FREQ && ARCH_PXA && PXA25x
1512 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1514 config CPU_FREQ_S3C64XX
1515 bool "CPUfreq support for Samsung S3C64XX CPUs"
1516 depends on CPU_FREQ && CPU_S3C6410
1521 Internal configuration node for common cpufreq on Samsung SoC
1523 config CPU_FREQ_S3C24XX
1524 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1525 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1528 This enables the CPUfreq driver for the Samsung S3C24XX family
1531 For details, take a look at <file:Documentation/cpu-freq>.
1535 config CPU_FREQ_S3C24XX_PLL
1536 bool "Support CPUfreq changing of PLL frequency"
1537 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1539 Compile in support for changing the PLL frequency from the
1540 S3C24XX series CPUfreq driver. The PLL takes time to settle
1541 after a frequency change, so by default it is not enabled.
1543 This also means that the PLL tables for the selected CPU(s) will
1544 be built which may increase the size of the kernel image.
1546 config CPU_FREQ_S3C24XX_DEBUG
1547 bool "Debug CPUfreq Samsung driver core"
1548 depends on CPU_FREQ_S3C24XX
1550 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1552 config CPU_FREQ_S3C24XX_IODEBUG
1553 bool "Debug CPUfreq Samsung driver IO timing"
1554 depends on CPU_FREQ_S3C24XX
1556 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1558 config CPU_FREQ_S3C24XX_DEBUGFS
1559 bool "Export debugfs for CPUFreq"
1560 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1562 Export status information via debugfs.
1566 source "drivers/cpuidle/Kconfig"
1570 menu "Floating point emulation"
1572 comment "At least one emulation must be selected"
1575 bool "NWFPE math emulation"
1576 depends on !AEABI || OABI_COMPAT
1578 Say Y to include the NWFPE floating point emulator in the kernel.
1579 This is necessary to run most binaries. Linux does not currently
1580 support floating point hardware so you need to say Y here even if
1581 your machine has an FPA or floating point co-processor podule.
1583 You may say N here if you are going to load the Acorn FPEmulator
1584 early in the bootup.
1587 bool "Support extended precision"
1588 depends on FPE_NWFPE
1590 Say Y to include 80-bit support in the kernel floating-point
1591 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1592 Note that gcc does not generate 80-bit operations by default,
1593 so in most cases this option only enlarges the size of the
1594 floating point emulator without any good reason.
1596 You almost surely want to say N here.
1599 bool "FastFPE math emulation (EXPERIMENTAL)"
1600 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1602 Say Y here to include the FAST floating point emulator in the kernel.
1603 This is an experimental much faster emulator which now also has full
1604 precision for the mantissa. It does not support any exceptions.
1605 It is very simple, and approximately 3-6 times faster than NWFPE.
1607 It should be sufficient for most programs. It may be not suitable
1608 for scientific calculations, but you have to check this for yourself.
1609 If you do not feel you need a faster FP emulation you should better
1613 bool "VFP-format floating point maths"
1614 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1616 Say Y to include VFP support code in the kernel. This is needed
1617 if your hardware includes a VFP unit.
1619 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1620 release notes and additional status information.
1622 Say N if your target does not have VFP hardware.
1630 bool "Advanced SIMD (NEON) Extension support"
1631 depends on VFPv3 && CPU_V7
1633 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1638 menu "Userspace binary formats"
1640 source "fs/Kconfig.binfmt"
1643 tristate "RISC OS personality"
1646 Say Y here to include the kernel code necessary if you want to run
1647 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1648 experimental; if this sounds frightening, say N and sleep in peace.
1649 You can also say M here to compile this support as a module (which
1650 will be called arthur).
1654 menu "Power management options"
1656 source "kernel/power/Kconfig"
1658 config ARCH_SUSPEND_POSSIBLE
1663 source "net/Kconfig"
1665 source "drivers/Kconfig"
1669 source "arch/arm/Kconfig.debug"
1671 source "security/Kconfig"
1673 source "crypto/Kconfig"
1675 source "lib/Kconfig"