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)
16 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
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
44 config ARCH_USES_GETTIMEOFFSET
48 config GENERIC_CLOCKEVENTS
51 config GENERIC_CLOCKEVENTS_BROADCAST
53 depends on GENERIC_CLOCKEVENTS
54 default y if SMP && !LOCAL_TIMERS
58 select GENERIC_ALLOCATOR
69 The Extended Industry Standard Architecture (EISA) bus was
70 developed as an open alternative to the IBM MicroChannel bus.
72 The EISA bus provided some of the features of the IBM MicroChannel
73 bus while maintaining backward compatibility with cards made for
74 the older ISA bus. The EISA bus saw limited use between 1988 and
75 1995 when it was made obsolete by the PCI bus.
77 Say Y here if you are building a kernel for an EISA-based machine.
87 MicroChannel Architecture is found in some IBM PS/2 machines and
88 laptops. It is a bus system similar to PCI or ISA. See
89 <file:Documentation/mca.txt> (and especially the web page given
90 there) before attempting to build an MCA bus kernel.
92 config GENERIC_HARDIRQS
96 config STACKTRACE_SUPPORT
100 config HAVE_LATENCYTOP_SUPPORT
105 config LOCKDEP_SUPPORT
109 config TRACE_IRQFLAGS_SUPPORT
113 config HARDIRQS_SW_RESEND
117 config GENERIC_IRQ_PROBE
121 config GENERIC_LOCKBREAK
124 depends on SMP && PREEMPT
126 config RWSEM_GENERIC_SPINLOCK
130 config RWSEM_XCHGADD_ALGORITHM
133 config ARCH_HAS_ILOG2_U32
136 config ARCH_HAS_ILOG2_U64
139 config ARCH_HAS_CPUFREQ
142 Internal node to signify that the ARCH has CPUFREQ support
143 and that the relevant menu configurations are displayed for
146 config GENERIC_HWEIGHT
150 config GENERIC_CALIBRATE_DELAY
154 config ARCH_MAY_HAVE_PC_FDC
160 config NEED_DMA_MAP_STATE
163 config GENERIC_ISA_DMA
172 config GENERIC_HARDIRQS_NO__DO_IRQ
175 config ARM_L1_CACHE_SHIFT_6
178 Setting ARM L1 cache line size to 64 Bytes.
182 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
183 default DRAM_BASE if REMAP_VECTORS_TO_RAM
186 The base address of exception vectors.
188 source "init/Kconfig"
190 source "kernel/Kconfig.freezer"
195 bool "MMU-based Paged Memory Management Support"
198 Select if you want MMU-based virtualised addressing space
199 support by paged memory management. If unsure, say 'Y'.
202 # The "ARM system type" choice list is ordered alphabetically by option
203 # text. Please add new entries in the option alphabetic order.
206 prompt "ARM system type"
207 default ARCH_VERSATILE
210 bool "Agilent AAEC-2000 based"
214 select ARCH_USES_GETTIMEOFFSET
216 This enables support for systems based on the Agilent AAEC-2000
218 config ARCH_INTEGRATOR
219 bool "ARM Ltd. Integrator family"
221 select ARCH_HAS_CPUFREQ
224 select GENERIC_CLOCKEVENTS
225 select PLAT_VERSATILE
227 Support for ARM's Integrator platform.
230 bool "ARM Ltd. RealView family"
234 select GENERIC_CLOCKEVENTS
235 select ARCH_WANT_OPTIONAL_GPIOLIB
236 select PLAT_VERSATILE
237 select ARM_TIMER_SP804
238 select GPIO_PL061 if GPIOLIB
240 This enables support for ARM Ltd RealView boards.
242 config ARCH_VERSATILE
243 bool "ARM Ltd. Versatile family"
248 select GENERIC_CLOCKEVENTS
249 select ARCH_WANT_OPTIONAL_GPIOLIB
250 select PLAT_VERSATILE
251 select ARM_TIMER_SP804
253 This enables support for ARM Ltd Versatile board.
256 bool "ARM Ltd. Versatile Express family"
257 select ARCH_WANT_OPTIONAL_GPIOLIB
259 select ARM_TIMER_SP804
261 select GENERIC_CLOCKEVENTS
264 select PLAT_VERSATILE
266 This enables support for the ARM Ltd Versatile Express boards.
270 select ARCH_REQUIRE_GPIOLIB
272 select ARCH_USES_GETTIMEOFFSET
274 This enables support for systems based on the Atmel AT91RM9200,
275 AT91SAM9 and AT91CAP9 processors.
278 bool "Broadcom BCMRING"
283 select GENERIC_CLOCKEVENTS
284 select ARCH_WANT_OPTIONAL_GPIOLIB
286 Support for Broadcom's BCMRing platform.
289 bool "Cirrus Logic CLPS711x/EP721x-based"
291 select ARCH_USES_GETTIMEOFFSET
293 Support for Cirrus Logic 711x/721x based boards.
296 bool "Cavium Networks CNS3XXX family"
298 select GENERIC_CLOCKEVENTS
301 Support for Cavium Networks CNS3XXX platform.
304 bool "Cortina Systems Gemini"
306 select ARCH_REQUIRE_GPIOLIB
307 select ARCH_USES_GETTIMEOFFSET
309 Support for the Cortina Systems Gemini family SoCs
316 select ARCH_USES_GETTIMEOFFSET
318 This is an evaluation board for the StrongARM processor available
319 from Digital. It has limited hardware on-board, including an
320 Ethernet interface, two PCMCIA sockets, two serial ports and a
329 select ARCH_REQUIRE_GPIOLIB
330 select ARCH_HAS_HOLES_MEMORYMODEL
331 select ARCH_USES_GETTIMEOFFSET
333 This enables support for the Cirrus EP93xx series of CPUs.
335 config ARCH_FOOTBRIDGE
339 select ARCH_USES_GETTIMEOFFSET
341 Support for systems based on the DC21285 companion chip
342 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
345 bool "Freescale MXC/iMX-based"
346 select GENERIC_CLOCKEVENTS
347 select ARCH_REQUIRE_GPIOLIB
350 Support for Freescale MXC/iMX-based family of processors
353 bool "Freescale STMP3xxx"
356 select ARCH_REQUIRE_GPIOLIB
357 select GENERIC_CLOCKEVENTS
358 select USB_ARCH_HAS_EHCI
360 Support for systems based on the Freescale 3xxx CPUs.
363 bool "Hilscher NetX based"
366 select GENERIC_CLOCKEVENTS
368 This enables support for systems based on the Hilscher NetX Soc
371 bool "Hynix HMS720x-based"
374 select ARCH_USES_GETTIMEOFFSET
376 This enables support for systems based on the Hynix HMS720x
384 select ARCH_SUPPORTS_MSI
387 Support for Intel's IOP13XX (XScale) family of processors.
395 select ARCH_REQUIRE_GPIOLIB
397 Support for Intel's 80219 and IOP32X (XScale) family of
406 select ARCH_REQUIRE_GPIOLIB
408 Support for Intel's IOP33X (XScale) family of processors.
415 select ARCH_USES_GETTIMEOFFSET
417 Support for Intel's IXP23xx (XScale) family of processors.
420 bool "IXP2400/2800-based"
424 select ARCH_USES_GETTIMEOFFSET
426 Support for Intel's IXP2400/2800 (XScale) family of processors.
433 select GENERIC_CLOCKEVENTS
434 select DMABOUNCE if PCI
436 Support for Intel's IXP4XX (XScale) family of processors.
442 select ARCH_USES_GETTIMEOFFSET
444 Say Y here if you intend to run this kernel on a LinkUp Systems
445 L7200 Software Development Board which uses an ARM720T processor.
446 Information on this board can be obtained at:
448 <http://www.linkupsys.com/>
450 If you have any questions or comments about the Linux kernel port
451 to this board, send e-mail to <sjhill@cotw.com>.
456 select ARCH_REQUIRE_GPIOLIB
457 select GENERIC_CLOCKEVENTS
460 Support for the Marvell Dove SoC 88AP510
463 bool "Marvell Kirkwood"
466 select ARCH_REQUIRE_GPIOLIB
467 select GENERIC_CLOCKEVENTS
470 Support for the following Marvell Kirkwood series SoCs:
471 88F6180, 88F6192 and 88F6281.
474 bool "Marvell Loki (88RC8480)"
476 select GENERIC_CLOCKEVENTS
479 Support for the Marvell Loki (88RC8480) SoC.
482 bool "Marvell MV78xx0"
485 select ARCH_REQUIRE_GPIOLIB
486 select GENERIC_CLOCKEVENTS
489 Support for the following Marvell MV78xx0 series SoCs:
497 select ARCH_REQUIRE_GPIOLIB
498 select GENERIC_CLOCKEVENTS
501 Support for the following Marvell Orion 5x series SoCs:
502 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
503 Orion-2 (5281), Orion-1-90 (6183).
506 bool "Marvell PXA168/910/MMP2"
508 select ARCH_REQUIRE_GPIOLIB
510 select GENERIC_CLOCKEVENTS
514 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
517 bool "Micrel/Kendin KS8695"
519 select ARCH_REQUIRE_GPIOLIB
520 select ARCH_USES_GETTIMEOFFSET
522 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
523 System-on-Chip devices.
526 bool "NetSilicon NS9xxx"
529 select GENERIC_CLOCKEVENTS
532 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
535 <http://www.digi.com/products/microprocessors/index.jsp>
538 bool "Nuvoton W90X900 CPU"
540 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 "Nuvoton NUC93X CPU"
557 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
558 low-power and high performance MPEG-4/JPEG multimedia controller chip.
561 bool "Philips Nexperia PNX4008 Mobile"
564 select ARCH_USES_GETTIMEOFFSET
566 This enables support for Philips PNX4008 mobile platform.
569 bool "PXA2xx/PXA3xx-based"
572 select ARCH_HAS_CPUFREQ
574 select ARCH_REQUIRE_GPIOLIB
575 select GENERIC_CLOCKEVENTS
579 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
584 select GENERIC_CLOCKEVENTS
586 Support for Qualcomm MSM/QSD based systems. This runs on the
587 apps processor of the MSM/QSD and depends on a shared memory
588 interface to the modem processor which runs the baseband
589 stack and controls some vital subsystems
590 (clock and power control, etc).
593 bool "Renesas SH-Mobile"
595 Support for Renesas's SH-Mobile ARM platforms
602 select ARCH_MAY_HAVE_PC_FDC
603 select HAVE_PATA_PLATFORM
606 select ARCH_SPARSEMEM_ENABLE
607 select ARCH_USES_GETTIMEOFFSET
609 On the Acorn Risc-PC, Linux can support the internal IDE disk and
610 CD-ROM interface, serial and parallel port, and the floppy drive.
616 select ARCH_SPARSEMEM_ENABLE
618 select ARCH_HAS_CPUFREQ
620 select GENERIC_CLOCKEVENTS
623 select ARCH_REQUIRE_GPIOLIB
625 Support for StrongARM 11x0 based boards.
628 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
630 select ARCH_HAS_CPUFREQ
632 select ARCH_USES_GETTIMEOFFSET
634 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
635 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
636 the Samsung SMDK2410 development board (and derivatives).
638 Note, the S3C2416 and the S3C2450 are so close that they even share
639 the same SoC ID code. This means that there is no seperate machine
640 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
643 bool "Samsung S3C64XX"
649 select ARCH_USES_GETTIMEOFFSET
650 select ARCH_HAS_CPUFREQ
651 select ARCH_REQUIRE_GPIOLIB
652 select SAMSUNG_CLKSRC
653 select SAMSUNG_IRQ_VIC_TIMER
654 select SAMSUNG_IRQ_UART
655 select S3C_GPIO_TRACK
656 select S3C_GPIO_PULL_UPDOWN
657 select S3C_GPIO_CFG_S3C24XX
658 select S3C_GPIO_CFG_S3C64XX
660 select USB_ARCH_HAS_OHCI
661 select SAMSUNG_GPIOLIB_4BIT
663 Samsung S3C64XX series based systems
666 bool "Samsung S5P6440"
670 select ARCH_USES_GETTIMEOFFSET
672 Samsung S5P6440 CPU based systems
675 bool "Samsung S5P6442"
679 select ARCH_USES_GETTIMEOFFSET
681 Samsung S5P6442 CPU based systems
684 bool "Samsung S5PC100"
688 select ARM_L1_CACHE_SHIFT_6
689 select ARCH_USES_GETTIMEOFFSET
691 Samsung S5PC100 series based systems
694 bool "Samsung S5PV210/S5PC110"
698 select ARM_L1_CACHE_SHIFT_6
699 select ARCH_USES_GETTIMEOFFSET
701 Samsung S5PV210/S5PC110 series based systems
710 select ARCH_USES_GETTIMEOFFSET
712 Support for the StrongARM based Digital DNARD machine, also known
713 as "Shark" (<http://www.shark-linux.de/shark.html>).
718 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
719 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
720 select ARCH_USES_GETTIMEOFFSET
722 Say Y here for systems based on one of the Sharp LH7A40X
723 System on a Chip processors. These CPUs include an ARM922T
724 core with a wide array of integrated devices for
725 hand-held and low-power applications.
728 bool "ST-Ericsson U300 Series"
734 select GENERIC_CLOCKEVENTS
738 Support for ST-Ericsson U300 series mobile platforms.
741 bool "ST-Ericsson U8500 Series"
744 select GENERIC_CLOCKEVENTS
746 select ARCH_REQUIRE_GPIOLIB
748 Support for ST-Ericsson's Ux500 architecture
751 bool "STMicroelectronics Nomadik"
756 select GENERIC_CLOCKEVENTS
757 select ARCH_REQUIRE_GPIOLIB
759 Support for the Nomadik platform by ST-Ericsson
763 select GENERIC_CLOCKEVENTS
764 select ARCH_REQUIRE_GPIOLIB
768 select GENERIC_ALLOCATOR
769 select ARCH_HAS_HOLES_MEMORYMODEL
771 Support for TI's DaVinci platform.
776 select ARCH_REQUIRE_GPIOLIB
777 select ARCH_HAS_CPUFREQ
778 select GENERIC_CLOCKEVENTS
779 select ARCH_HAS_HOLES_MEMORYMODEL
781 Support for TI's OMAP platform (OMAP1 and OMAP2).
786 select ARCH_REQUIRE_GPIOLIB
788 select GENERIC_CLOCKEVENTS
791 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
796 # This is sorted alphabetically by mach-* pathname. However, plat-*
797 # Kconfigs may be included either alphabetically (according to the
798 # plat- suffix) or along side the corresponding mach-* source.
800 source "arch/arm/mach-aaec2000/Kconfig"
802 source "arch/arm/mach-at91/Kconfig"
804 source "arch/arm/mach-bcmring/Kconfig"
806 source "arch/arm/mach-clps711x/Kconfig"
808 source "arch/arm/mach-cns3xxx/Kconfig"
810 source "arch/arm/mach-davinci/Kconfig"
812 source "arch/arm/mach-dove/Kconfig"
814 source "arch/arm/mach-ep93xx/Kconfig"
816 source "arch/arm/mach-footbridge/Kconfig"
818 source "arch/arm/mach-gemini/Kconfig"
820 source "arch/arm/mach-h720x/Kconfig"
822 source "arch/arm/mach-integrator/Kconfig"
824 source "arch/arm/mach-iop32x/Kconfig"
826 source "arch/arm/mach-iop33x/Kconfig"
828 source "arch/arm/mach-iop13xx/Kconfig"
830 source "arch/arm/mach-ixp4xx/Kconfig"
832 source "arch/arm/mach-ixp2000/Kconfig"
834 source "arch/arm/mach-ixp23xx/Kconfig"
836 source "arch/arm/mach-kirkwood/Kconfig"
838 source "arch/arm/mach-ks8695/Kconfig"
840 source "arch/arm/mach-lh7a40x/Kconfig"
842 source "arch/arm/mach-loki/Kconfig"
844 source "arch/arm/mach-msm/Kconfig"
846 source "arch/arm/mach-mv78xx0/Kconfig"
848 source "arch/arm/plat-mxc/Kconfig"
850 source "arch/arm/mach-netx/Kconfig"
852 source "arch/arm/mach-nomadik/Kconfig"
853 source "arch/arm/plat-nomadik/Kconfig"
855 source "arch/arm/mach-ns9xxx/Kconfig"
857 source "arch/arm/mach-nuc93x/Kconfig"
859 source "arch/arm/plat-omap/Kconfig"
861 source "arch/arm/mach-omap1/Kconfig"
863 source "arch/arm/mach-omap2/Kconfig"
865 source "arch/arm/mach-orion5x/Kconfig"
867 source "arch/arm/mach-pxa/Kconfig"
868 source "arch/arm/plat-pxa/Kconfig"
870 source "arch/arm/mach-mmp/Kconfig"
872 source "arch/arm/mach-realview/Kconfig"
874 source "arch/arm/mach-sa1100/Kconfig"
876 source "arch/arm/plat-samsung/Kconfig"
877 source "arch/arm/plat-s3c24xx/Kconfig"
878 source "arch/arm/plat-s5p/Kconfig"
880 source "arch/arm/plat-spear/Kconfig"
883 source "arch/arm/mach-s3c2400/Kconfig"
884 source "arch/arm/mach-s3c2410/Kconfig"
885 source "arch/arm/mach-s3c2412/Kconfig"
886 source "arch/arm/mach-s3c2416/Kconfig"
887 source "arch/arm/mach-s3c2440/Kconfig"
888 source "arch/arm/mach-s3c2443/Kconfig"
892 source "arch/arm/mach-s3c64xx/Kconfig"
895 source "arch/arm/mach-s5p6440/Kconfig"
897 source "arch/arm/mach-s5p6442/Kconfig"
899 source "arch/arm/mach-s5pc100/Kconfig"
901 source "arch/arm/mach-s5pv210/Kconfig"
903 source "arch/arm/mach-shmobile/Kconfig"
905 source "arch/arm/plat-stmp3xxx/Kconfig"
907 source "arch/arm/mach-u300/Kconfig"
909 source "arch/arm/mach-ux500/Kconfig"
911 source "arch/arm/mach-versatile/Kconfig"
913 source "arch/arm/mach-vexpress/Kconfig"
915 source "arch/arm/mach-w90x900/Kconfig"
917 # Definitions to make life easier
923 select GENERIC_CLOCKEVENTS
931 config PLAT_VERSATILE
934 config ARM_TIMER_SP804
937 source arch/arm/mm/Kconfig
940 bool "Enable iWMMXt support"
941 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
942 default y if PXA27x || PXA3xx || ARCH_MMP
944 Enable support for iWMMXt context switching at run time if
945 running on a CPU that supports it.
947 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
950 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
954 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
955 (!ARCH_OMAP3 || OMAP3_EMU)
960 source "arch/arm/Kconfig-nommu"
963 config ARM_ERRATA_411920
964 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
965 depends on CPU_V6 && !SMP
967 Invalidation of the Instruction Cache operation can
968 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
969 It does not affect the MPCore. This option enables the ARM Ltd.
970 recommended workaround.
972 config ARM_ERRATA_430973
973 bool "ARM errata: Stale prediction on replaced interworking branch"
976 This option enables the workaround for the 430973 Cortex-A8
977 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
978 interworking branch is replaced with another code sequence at the
979 same virtual address, whether due to self-modifying code or virtual
980 to physical address re-mapping, Cortex-A8 does not recover from the
981 stale interworking branch prediction. This results in Cortex-A8
982 executing the new code sequence in the incorrect ARM or Thumb state.
983 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
984 and also flushes the branch target cache at every context switch.
985 Note that setting specific bits in the ACTLR register may not be
986 available in non-secure mode.
988 config ARM_ERRATA_458693
989 bool "ARM errata: Processor deadlock when a false hazard is created"
992 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
993 erratum. For very specific sequences of memory operations, it is
994 possible for a hazard condition intended for a cache line to instead
995 be incorrectly associated with a different cache line. This false
996 hazard might then cause a processor deadlock. The workaround enables
997 the L1 caching of the NEON accesses and disables the PLD instruction
998 in the ACTLR register. Note that setting specific bits in the ACTLR
999 register may not be available in non-secure mode.
1001 config ARM_ERRATA_460075
1002 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1005 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1006 erratum. Any asynchronous access to the L2 cache may encounter a
1007 situation in which recent store transactions to the L2 cache are lost
1008 and overwritten with stale memory contents from external memory. The
1009 workaround disables the write-allocate mode for the L2 cache via the
1010 ACTLR register. Note that setting specific bits in the ACTLR register
1011 may not be available in non-secure mode.
1013 config PL310_ERRATA_588369
1014 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1015 depends on CACHE_L2X0 && ARCH_OMAP4
1017 The PL310 L2 cache controller implements three types of Clean &
1018 Invalidate maintenance operations: by Physical Address
1019 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1020 They are architecturally defined to behave as the execution of a
1021 clean operation followed immediately by an invalidate operation,
1022 both performing to the same memory location. This functionality
1023 is not correctly implemented in PL310 as clean lines are not
1024 invalidated as a result of these operations. Note that this errata
1025 uses Texas Instrument's secure monitor api.
1028 source "arch/arm/common/Kconfig"
1030 config FORCE_MAX_ZONEORDER
1043 Find out whether you have ISA slots on your motherboard. ISA is the
1044 name of a bus system, i.e. the way the CPU talks to the other stuff
1045 inside your box. Other bus systems are PCI, EISA, MicroChannel
1046 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1047 newer boards don't support it. If you have ISA, say Y, otherwise N.
1049 # Select ISA DMA controller support
1054 # Select ISA DMA interface
1059 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1061 Find out whether you have a PCI motherboard. PCI is the name of a
1062 bus system, i.e. the way the CPU talks to the other stuff inside
1063 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1064 VESA. If you have PCI, say Y, otherwise N.
1073 # Select the host bridge type
1074 config PCI_HOST_VIA82C505
1076 depends on PCI && ARCH_SHARK
1079 config PCI_HOST_ITE8152
1081 depends on PCI && MACH_ARMCORE
1085 source "drivers/pci/Kconfig"
1087 source "drivers/pcmcia/Kconfig"
1091 menu "Kernel Features"
1093 source "kernel/time/Kconfig"
1096 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1097 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1098 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1099 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1100 depends on GENERIC_CLOCKEVENTS
1101 select USE_GENERIC_SMP_HELPERS
1102 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1104 This enables support for systems with more than one CPU. If you have
1105 a system with only one CPU, like most personal computers, say N. If
1106 you have a system with more than one CPU, say Y.
1108 If you say N here, the kernel will run on single and multiprocessor
1109 machines, but will use only one CPU of a multiprocessor machine. If
1110 you say Y here, the kernel will run on many, but not all, single
1111 processor machines. On a single processor machine, the kernel will
1112 run faster if you say N here.
1114 See also <file:Documentation/i386/IO-APIC.txt>,
1115 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1116 <http://www.linuxdoc.org/docs.html#howto>.
1118 If you don't know what to do here, say N.
1124 This option enables support for the ARM system coherency unit
1130 This options enables support for the ARM timer and watchdog unit
1133 prompt "Memory split"
1136 Select the desired split between kernel and user memory.
1138 If you are not absolutely sure what you are doing, leave this
1142 bool "3G/1G user/kernel split"
1144 bool "2G/2G user/kernel split"
1146 bool "1G/3G user/kernel split"
1151 default 0x40000000 if VMSPLIT_1G
1152 default 0x80000000 if VMSPLIT_2G
1156 int "Maximum number of CPUs (2-32)"
1162 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1163 depends on SMP && HOTPLUG && EXPERIMENTAL
1165 Say Y here to experiment with turning CPUs off and on. CPUs
1166 can be controlled through /sys/devices/system/cpu.
1169 bool "Use local timer interrupts"
1170 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1171 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1173 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1175 Enable support for local timers on SMP platforms, rather then the
1176 legacy IPI broadcast method. Local timers allows the system
1177 accounting to be spread across the timer interval, preventing a
1178 "thundering herd" at every timer tick.
1180 source kernel/Kconfig.preempt
1184 default 128 if ARCH_L7200
1185 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1186 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1187 default AT91_TIMER_HZ if ARCH_AT91
1190 config THUMB2_KERNEL
1191 bool "Compile the kernel in Thumb-2 mode"
1192 depends on CPU_V7 && EXPERIMENTAL
1194 select ARM_ASM_UNIFIED
1196 By enabling this option, the kernel will be compiled in
1197 Thumb-2 mode. A compiler/assembler that understand the unified
1198 ARM-Thumb syntax is needed.
1202 config ARM_ASM_UNIFIED
1206 bool "Use the ARM EABI to compile the kernel"
1208 This option allows for the kernel to be compiled using the latest
1209 ARM ABI (aka EABI). This is only useful if you are using a user
1210 space environment that is also compiled with EABI.
1212 Since there are major incompatibilities between the legacy ABI and
1213 EABI, especially with regard to structure member alignment, this
1214 option also changes the kernel syscall calling convention to
1215 disambiguate both ABIs and allow for backward compatibility support
1216 (selected with CONFIG_OABI_COMPAT).
1218 To use this you need GCC version 4.0.0 or later.
1221 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1222 depends on AEABI && EXPERIMENTAL
1225 This option preserves the old syscall interface along with the
1226 new (ARM EABI) one. It also provides a compatibility layer to
1227 intercept syscalls that have structure arguments which layout
1228 in memory differs between the legacy ABI and the new ARM EABI
1229 (only for non "thumb" binaries). This option adds a tiny
1230 overhead to all syscalls and produces a slightly larger kernel.
1231 If you know you'll be using only pure EABI user space then you
1232 can say N here. If this option is not selected and you attempt
1233 to execute a legacy ABI binary then the result will be
1234 UNPREDICTABLE (in fact it can be predicted that it won't work
1235 at all). If in doubt say Y.
1237 config ARCH_HAS_HOLES_MEMORYMODEL
1240 # Discontigmem is deprecated
1241 config ARCH_DISCONTIGMEM_ENABLE
1244 config ARCH_SPARSEMEM_ENABLE
1247 config ARCH_SPARSEMEM_DEFAULT
1248 def_bool ARCH_SPARSEMEM_ENABLE
1250 config ARCH_SELECT_MEMORY_MODEL
1251 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1255 default "4" if ARCH_LH7A40X
1257 depends on NEED_MULTIPLE_NODES
1260 bool "High Memory Support (EXPERIMENTAL)"
1261 depends on MMU && EXPERIMENTAL
1263 The address space of ARM processors is only 4 Gigabytes large
1264 and it has to accommodate user address space, kernel address
1265 space as well as some memory mapped IO. That means that, if you
1266 have a large amount of physical memory and/or IO, not all of the
1267 memory can be "permanently mapped" by the kernel. The physical
1268 memory that is not permanently mapped is called "high memory".
1270 Depending on the selected kernel/user memory split, minimum
1271 vmalloc space and actual amount of RAM, you may not need this
1272 option which should result in a slightly faster kernel.
1277 bool "Allocate 2nd-level pagetables from highmem"
1279 depends on !OUTER_CACHE
1281 config HW_PERF_EVENTS
1282 bool "Enable hardware performance counter support for perf events"
1283 depends on PERF_EVENTS && CPU_HAS_PMU
1286 Enable hardware performance counter support for perf events. If
1287 disabled, perf events will use software events only.
1292 bool "Timer and CPU usage LEDs"
1293 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1294 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1295 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1296 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1297 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1298 ARCH_AT91 || ARCH_DAVINCI || \
1299 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1301 If you say Y here, the LEDs on your machine will be used
1302 to provide useful information about your current system status.
1304 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1305 be able to select which LEDs are active using the options below. If
1306 you are compiling a kernel for the EBSA-110 or the LART however, the
1307 red LED will simply flash regularly to indicate that the system is
1308 still functional. It is safe to say Y here if you have a CATS
1309 system, but the driver will do nothing.
1312 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1313 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1314 || MACH_OMAP_PERSEUS2
1316 depends on !GENERIC_CLOCKEVENTS
1317 default y if ARCH_EBSA110
1319 If you say Y here, one of the system LEDs (the green one on the
1320 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1321 will flash regularly to indicate that the system is still
1322 operational. This is mainly useful to kernel hackers who are
1323 debugging unstable kernels.
1325 The LART uses the same LED for both Timer LED and CPU usage LED
1326 functions. You may choose to use both, but the Timer LED function
1327 will overrule the CPU usage LED.
1330 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1332 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1333 || MACH_OMAP_PERSEUS2
1336 If you say Y here, the red LED will be used to give a good real
1337 time indication of CPU usage, by lighting whenever the idle task
1338 is not currently executing.
1340 The LART uses the same LED for both Timer LED and CPU usage LED
1341 functions. You may choose to use both, but the Timer LED function
1342 will overrule the CPU usage LED.
1344 config ALIGNMENT_TRAP
1346 depends on CPU_CP15_MMU
1347 default y if !ARCH_EBSA110
1348 select HAVE_PROC_CPU if PROC_FS
1350 ARM processors cannot fetch/store information which is not
1351 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1352 address divisible by 4. On 32-bit ARM processors, these non-aligned
1353 fetch/store instructions will be emulated in software if you say
1354 here, which has a severe performance impact. This is necessary for
1355 correct operation of some network protocols. With an IP-only
1356 configuration it is safe to say N, otherwise say Y.
1358 config UACCESS_WITH_MEMCPY
1359 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1360 depends on MMU && EXPERIMENTAL
1361 default y if CPU_FEROCEON
1363 Implement faster copy_to_user and clear_user methods for CPU
1364 cores where a 8-word STM instruction give significantly higher
1365 memory write throughput than a sequence of individual 32bit stores.
1367 A possible side effect is a slight increase in scheduling latency
1368 between threads sharing the same address space if they invoke
1369 such copy operations with large buffers.
1371 However, if the CPU data cache is using a write-allocate mode,
1372 this option is unlikely to provide any performance gain.
1378 # Compressed boot loader in ROM. Yes, we really want to ask about
1379 # TEXT and BSS so we preserve their values in the config files.
1380 config ZBOOT_ROM_TEXT
1381 hex "Compressed ROM boot loader base address"
1384 The physical address at which the ROM-able zImage is to be
1385 placed in the target. Platforms which normally make use of
1386 ROM-able zImage formats normally set this to a suitable
1387 value in their defconfig file.
1389 If ZBOOT_ROM is not enabled, this has no effect.
1391 config ZBOOT_ROM_BSS
1392 hex "Compressed ROM boot loader BSS address"
1395 The base address of an area of read/write memory in the target
1396 for the ROM-able zImage which must be available while the
1397 decompressor is running. It must be large enough to hold the
1398 entire decompressed kernel plus an additional 128 KiB.
1399 Platforms which normally make use of ROM-able zImage formats
1400 normally set this to a suitable value in their defconfig file.
1402 If ZBOOT_ROM is not enabled, this has no effect.
1405 bool "Compressed boot loader in ROM/flash"
1406 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1408 Say Y here if you intend to execute your compressed kernel image
1409 (zImage) directly from ROM or flash. If unsure, say N.
1412 string "Default kernel command string"
1415 On some architectures (EBSA110 and CATS), there is currently no way
1416 for the boot loader to pass arguments to the kernel. For these
1417 architectures, you should supply some command-line options at build
1418 time by entering them here. As a minimum, you should specify the
1419 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1421 config CMDLINE_FORCE
1422 bool "Always use the default kernel command string"
1423 depends on CMDLINE != ""
1425 Always use the default kernel command string, even if the boot
1426 loader passes other arguments to the kernel.
1427 This is useful if you cannot or don't want to change the
1428 command-line options your boot loader passes to the kernel.
1433 bool "Kernel Execute-In-Place from ROM"
1434 depends on !ZBOOT_ROM
1436 Execute-In-Place allows the kernel to run from non-volatile storage
1437 directly addressable by the CPU, such as NOR flash. This saves RAM
1438 space since the text section of the kernel is not loaded from flash
1439 to RAM. Read-write sections, such as the data section and stack,
1440 are still copied to RAM. The XIP kernel is not compressed since
1441 it has to run directly from flash, so it will take more space to
1442 store it. The flash address used to link the kernel object files,
1443 and for storing it, is configuration dependent. Therefore, if you
1444 say Y here, you must know the proper physical address where to
1445 store the kernel image depending on your own flash memory usage.
1447 Also note that the make target becomes "make xipImage" rather than
1448 "make zImage" or "make Image". The final kernel binary to put in
1449 ROM memory will be arch/arm/boot/xipImage.
1453 config XIP_PHYS_ADDR
1454 hex "XIP Kernel Physical Location"
1455 depends on XIP_KERNEL
1456 default "0x00080000"
1458 This is the physical address in your flash memory the kernel will
1459 be linked for and stored to. This address is dependent on your
1463 bool "Kexec system call (EXPERIMENTAL)"
1464 depends on EXPERIMENTAL
1466 kexec is a system call that implements the ability to shutdown your
1467 current kernel, and to start another kernel. It is like a reboot
1468 but it is independent of the system firmware. And like a reboot
1469 you can start any kernel with it, not just Linux.
1471 It is an ongoing process to be certain the hardware in a machine
1472 is properly shutdown, so do not be surprised if this code does not
1473 initially work for you. It may help to enable device hotplugging
1477 bool "Export atags in procfs"
1481 Should the atags used to boot the kernel be exported in an "atags"
1482 file in procfs. Useful with kexec.
1486 menu "CPU Power Management"
1490 source "drivers/cpufreq/Kconfig"
1492 config CPU_FREQ_SA1100
1495 config CPU_FREQ_SA1110
1498 config CPU_FREQ_INTEGRATOR
1499 tristate "CPUfreq driver for ARM Integrator CPUs"
1500 depends on ARCH_INTEGRATOR && CPU_FREQ
1503 This enables the CPUfreq driver for ARM Integrator CPUs.
1505 For details, take a look at <file:Documentation/cpu-freq>.
1511 depends on CPU_FREQ && ARCH_PXA && PXA25x
1513 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1515 config CPU_FREQ_S3C64XX
1516 bool "CPUfreq support for Samsung S3C64XX CPUs"
1517 depends on CPU_FREQ && CPU_S3C6410
1522 Internal configuration node for common cpufreq on Samsung SoC
1524 config CPU_FREQ_S3C24XX
1525 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1526 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1529 This enables the CPUfreq driver for the Samsung S3C24XX family
1532 For details, take a look at <file:Documentation/cpu-freq>.
1536 config CPU_FREQ_S3C24XX_PLL
1537 bool "Support CPUfreq changing of PLL frequency"
1538 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1540 Compile in support for changing the PLL frequency from the
1541 S3C24XX series CPUfreq driver. The PLL takes time to settle
1542 after a frequency change, so by default it is not enabled.
1544 This also means that the PLL tables for the selected CPU(s) will
1545 be built which may increase the size of the kernel image.
1547 config CPU_FREQ_S3C24XX_DEBUG
1548 bool "Debug CPUfreq Samsung driver core"
1549 depends on CPU_FREQ_S3C24XX
1551 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1553 config CPU_FREQ_S3C24XX_IODEBUG
1554 bool "Debug CPUfreq Samsung driver IO timing"
1555 depends on CPU_FREQ_S3C24XX
1557 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1559 config CPU_FREQ_S3C24XX_DEBUGFS
1560 bool "Export debugfs for CPUFreq"
1561 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1563 Export status information via debugfs.
1567 source "drivers/cpuidle/Kconfig"
1571 menu "Floating point emulation"
1573 comment "At least one emulation must be selected"
1576 bool "NWFPE math emulation"
1577 depends on !AEABI || OABI_COMPAT
1579 Say Y to include the NWFPE floating point emulator in the kernel.
1580 This is necessary to run most binaries. Linux does not currently
1581 support floating point hardware so you need to say Y here even if
1582 your machine has an FPA or floating point co-processor podule.
1584 You may say N here if you are going to load the Acorn FPEmulator
1585 early in the bootup.
1588 bool "Support extended precision"
1589 depends on FPE_NWFPE
1591 Say Y to include 80-bit support in the kernel floating-point
1592 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1593 Note that gcc does not generate 80-bit operations by default,
1594 so in most cases this option only enlarges the size of the
1595 floating point emulator without any good reason.
1597 You almost surely want to say N here.
1600 bool "FastFPE math emulation (EXPERIMENTAL)"
1601 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1603 Say Y here to include the FAST floating point emulator in the kernel.
1604 This is an experimental much faster emulator which now also has full
1605 precision for the mantissa. It does not support any exceptions.
1606 It is very simple, and approximately 3-6 times faster than NWFPE.
1608 It should be sufficient for most programs. It may be not suitable
1609 for scientific calculations, but you have to check this for yourself.
1610 If you do not feel you need a faster FP emulation you should better
1614 bool "VFP-format floating point maths"
1615 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1617 Say Y to include VFP support code in the kernel. This is needed
1618 if your hardware includes a VFP unit.
1620 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1621 release notes and additional status information.
1623 Say N if your target does not have VFP hardware.
1631 bool "Advanced SIMD (NEON) Extension support"
1632 depends on VFPv3 && CPU_V7
1634 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1639 menu "Userspace binary formats"
1641 source "fs/Kconfig.binfmt"
1644 tristate "RISC OS personality"
1647 Say Y here to include the kernel code necessary if you want to run
1648 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1649 experimental; if this sounds frightening, say N and sleep in peace.
1650 You can also say M here to compile this support as a module (which
1651 will be called arthur).
1655 menu "Power management options"
1657 source "kernel/power/Kconfig"
1659 config ARCH_SUSPEND_POSSIBLE
1664 source "net/Kconfig"
1666 source "drivers/Kconfig"
1670 source "arch/arm/Kconfig.debug"
1672 source "security/Kconfig"
1674 source "crypto/Kconfig"
1676 source "lib/Kconfig"