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
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 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
187 default DRAM_BASE if REMAP_VECTORS_TO_RAM
190 The base address of exception vectors.
192 source "init/Kconfig"
194 source "kernel/Kconfig.freezer"
199 bool "MMU-based Paged Memory Management Support"
202 Select if you want MMU-based virtualised addressing space
203 support by paged memory management. If unsure, say 'Y'.
206 # The "ARM system type" choice list is ordered alphabetically by option
207 # text. Please add new entries in the option alphabetic order.
210 prompt "ARM system type"
211 default ARCH_VERSATILE
214 bool "Agilent AAEC-2000 based"
218 select ARCH_USES_GETTIMEOFFSET
220 This enables support for systems based on the Agilent AAEC-2000
222 config ARCH_INTEGRATOR
223 bool "ARM Ltd. Integrator family"
225 select ARCH_HAS_CPUFREQ
228 select GENERIC_CLOCKEVENTS
229 select PLAT_VERSATILE
231 Support for ARM's Integrator platform.
234 bool "ARM Ltd. RealView family"
238 select GENERIC_CLOCKEVENTS
239 select ARCH_WANT_OPTIONAL_GPIOLIB
240 select PLAT_VERSATILE
241 select ARM_TIMER_SP804
242 select GPIO_PL061 if GPIOLIB
244 This enables support for ARM Ltd RealView boards.
246 config ARCH_VERSATILE
247 bool "ARM Ltd. Versatile family"
252 select GENERIC_CLOCKEVENTS
253 select ARCH_WANT_OPTIONAL_GPIOLIB
254 select PLAT_VERSATILE
255 select ARM_TIMER_SP804
257 This enables support for ARM Ltd Versatile board.
260 bool "ARM Ltd. Versatile Express family"
261 select ARCH_WANT_OPTIONAL_GPIOLIB
263 select ARM_TIMER_SP804
265 select GENERIC_CLOCKEVENTS
268 select PLAT_VERSATILE
270 This enables support for the ARM Ltd Versatile Express boards.
274 select ARCH_REQUIRE_GPIOLIB
277 This enables support for systems based on the Atmel AT91RM9200,
278 AT91SAM9 and AT91CAP9 processors.
281 bool "Broadcom BCMRING"
286 select GENERIC_CLOCKEVENTS
287 select ARCH_WANT_OPTIONAL_GPIOLIB
289 Support for Broadcom's BCMRing platform.
292 bool "Cirrus Logic CLPS711x/EP721x-based"
294 select ARCH_USES_GETTIMEOFFSET
296 Support for Cirrus Logic 711x/721x based boards.
299 bool "Cavium Networks CNS3XXX family"
301 select GENERIC_CLOCKEVENTS
304 Support for Cavium Networks CNS3XXX platform.
307 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
332 select ARCH_REQUIRE_GPIOLIB
333 select ARCH_HAS_HOLES_MEMORYMODEL
334 select ARCH_USES_GETTIMEOFFSET
336 This enables support for the Cirrus EP93xx series of CPUs.
338 config ARCH_FOOTBRIDGE
342 select ARCH_USES_GETTIMEOFFSET
344 Support for systems based on the DC21285 companion chip
345 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
348 bool "Freescale MXC/iMX-based"
349 select GENERIC_CLOCKEVENTS
350 select ARCH_REQUIRE_GPIOLIB
353 Support for Freescale MXC/iMX-based family of processors
356 bool "Freescale STMP3xxx"
359 select ARCH_REQUIRE_GPIOLIB
360 select GENERIC_CLOCKEVENTS
361 select USB_ARCH_HAS_EHCI
363 Support for systems based on the Freescale 3xxx CPUs.
366 bool "Hilscher NetX based"
369 select GENERIC_CLOCKEVENTS
371 This enables support for systems based on the Hilscher NetX Soc
374 bool "Hynix HMS720x-based"
377 select ARCH_USES_GETTIMEOFFSET
379 This enables support for systems based on the Hynix HMS720x
387 select ARCH_SUPPORTS_MSI
390 Support for Intel's IOP13XX (XScale) family of processors.
398 select ARCH_REQUIRE_GPIOLIB
400 Support for Intel's 80219 and IOP32X (XScale) family of
409 select ARCH_REQUIRE_GPIOLIB
411 Support for Intel's IOP33X (XScale) family of processors.
418 select ARCH_USES_GETTIMEOFFSET
420 Support for Intel's IXP23xx (XScale) family of processors.
423 bool "IXP2400/2800-based"
427 select ARCH_USES_GETTIMEOFFSET
429 Support for Intel's IXP2400/2800 (XScale) family of processors.
436 select GENERIC_CLOCKEVENTS
437 select DMABOUNCE if PCI
439 Support for Intel's IXP4XX (XScale) family of processors.
445 select ARCH_USES_GETTIMEOFFSET
447 Say Y here if you intend to run this kernel on a LinkUp Systems
448 L7200 Software Development Board which uses an ARM720T processor.
449 Information on this board can be obtained at:
451 <http://www.linkupsys.com/>
453 If you have any questions or comments about the Linux kernel port
454 to this board, send e-mail to <sjhill@cotw.com>.
459 select ARCH_REQUIRE_GPIOLIB
460 select GENERIC_CLOCKEVENTS
463 Support for the Marvell Dove SoC 88AP510
466 bool "Marvell Kirkwood"
469 select ARCH_REQUIRE_GPIOLIB
470 select GENERIC_CLOCKEVENTS
473 Support for the following Marvell Kirkwood series SoCs:
474 88F6180, 88F6192 and 88F6281.
477 bool "Marvell Loki (88RC8480)"
479 select GENERIC_CLOCKEVENTS
482 Support for the Marvell Loki (88RC8480) SoC.
485 bool "Marvell MV78xx0"
488 select ARCH_REQUIRE_GPIOLIB
489 select GENERIC_CLOCKEVENTS
492 Support for the following Marvell MV78xx0 series SoCs:
500 select ARCH_REQUIRE_GPIOLIB
501 select GENERIC_CLOCKEVENTS
504 Support for the following Marvell Orion 5x series SoCs:
505 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
506 Orion-2 (5281), Orion-1-90 (6183).
509 bool "Marvell PXA168/910/MMP2"
511 select ARCH_REQUIRE_GPIOLIB
513 select GENERIC_CLOCKEVENTS
517 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
520 bool "Micrel/Kendin KS8695"
522 select ARCH_REQUIRE_GPIOLIB
523 select ARCH_USES_GETTIMEOFFSET
525 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
526 System-on-Chip devices.
529 bool "NetSilicon NS9xxx"
532 select GENERIC_CLOCKEVENTS
535 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
538 <http://www.digi.com/products/microprocessors/index.jsp>
541 bool "Nuvoton W90X900 CPU"
543 select ARCH_REQUIRE_GPIOLIB
545 select GENERIC_CLOCKEVENTS
547 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
548 At present, the w90x900 has been renamed nuc900, regarding
549 the ARM series product line, you can login the following
550 link address to know more.
552 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
553 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
556 bool "Nuvoton NUC93X CPU"
560 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
561 low-power and high performance MPEG-4/JPEG multimedia controller chip.
564 bool "Philips Nexperia PNX4008 Mobile"
567 select ARCH_USES_GETTIMEOFFSET
569 This enables support for Philips PNX4008 mobile platform.
572 bool "PXA2xx/PXA3xx-based"
575 select ARCH_HAS_CPUFREQ
577 select ARCH_REQUIRE_GPIOLIB
578 select GENERIC_CLOCKEVENTS
582 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
587 select GENERIC_CLOCKEVENTS
589 Support for Qualcomm MSM/QSD based systems. This runs on the
590 apps processor of the MSM/QSD and depends on a shared memory
591 interface to the modem processor which runs the baseband
592 stack and controls some vital subsystems
593 (clock and power control, etc).
596 bool "Renesas SH-Mobile"
598 Support for Renesas's SH-Mobile ARM platforms
605 select ARCH_MAY_HAVE_PC_FDC
606 select HAVE_PATA_PLATFORM
609 select ARCH_SPARSEMEM_ENABLE
610 select ARCH_USES_GETTIMEOFFSET
612 On the Acorn Risc-PC, Linux can support the internal IDE disk and
613 CD-ROM interface, serial and parallel port, and the floppy drive.
619 select ARCH_SPARSEMEM_ENABLE
621 select ARCH_HAS_CPUFREQ
623 select GENERIC_CLOCKEVENTS
626 select ARCH_REQUIRE_GPIOLIB
628 Support for StrongARM 11x0 based boards.
631 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
633 select ARCH_HAS_CPUFREQ
635 select ARCH_USES_GETTIMEOFFSET
637 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
638 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
639 the Samsung SMDK2410 development board (and derivatives).
641 Note, the S3C2416 and the S3C2450 are so close that they even share
642 the same SoC ID code. This means that there is no seperate machine
643 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
646 bool "Samsung S3C64XX"
652 select ARCH_USES_GETTIMEOFFSET
653 select ARCH_HAS_CPUFREQ
654 select ARCH_REQUIRE_GPIOLIB
655 select SAMSUNG_CLKSRC
656 select SAMSUNG_IRQ_VIC_TIMER
657 select SAMSUNG_IRQ_UART
658 select S3C_GPIO_TRACK
659 select S3C_GPIO_PULL_UPDOWN
660 select S3C_GPIO_CFG_S3C24XX
661 select S3C_GPIO_CFG_S3C64XX
663 select USB_ARCH_HAS_OHCI
664 select SAMSUNG_GPIOLIB_4BIT
666 Samsung S3C64XX series based systems
669 bool "Samsung S5P6440"
673 select ARCH_USES_GETTIMEOFFSET
675 Samsung S5P6440 CPU based systems
678 bool "Samsung S5P6442"
682 select ARCH_USES_GETTIMEOFFSET
684 Samsung S5P6442 CPU based systems
687 bool "Samsung S5PC100"
691 select ARM_L1_CACHE_SHIFT_6
692 select ARCH_USES_GETTIMEOFFSET
694 Samsung S5PC100 series based systems
697 bool "Samsung S5PV210/S5PC110"
701 select ARM_L1_CACHE_SHIFT_6
702 select ARCH_USES_GETTIMEOFFSET
704 Samsung S5PV210/S5PC110 series based systems
713 select ARCH_USES_GETTIMEOFFSET
715 Support for the StrongARM based Digital DNARD machine, also known
716 as "Shark" (<http://www.shark-linux.de/shark.html>).
721 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
722 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
723 select ARCH_USES_GETTIMEOFFSET
725 Say Y here for systems based on one of the Sharp LH7A40X
726 System on a Chip processors. These CPUs include an ARM922T
727 core with a wide array of integrated devices for
728 hand-held and low-power applications.
731 bool "ST-Ericsson U300 Series"
737 select GENERIC_CLOCKEVENTS
741 Support for ST-Ericsson U300 series mobile platforms.
744 bool "ST-Ericsson U8500 Series"
747 select GENERIC_CLOCKEVENTS
749 select ARCH_REQUIRE_GPIOLIB
751 Support for ST-Ericsson's Ux500 architecture
754 bool "STMicroelectronics Nomadik"
759 select GENERIC_CLOCKEVENTS
760 select ARCH_REQUIRE_GPIOLIB
762 Support for the Nomadik platform by ST-Ericsson
766 select GENERIC_CLOCKEVENTS
767 select ARCH_REQUIRE_GPIOLIB
771 select GENERIC_ALLOCATOR
772 select ARCH_HAS_HOLES_MEMORYMODEL
774 Support for TI's DaVinci platform.
779 select ARCH_REQUIRE_GPIOLIB
780 select ARCH_HAS_CPUFREQ
781 select GENERIC_CLOCKEVENTS
782 select ARCH_HAS_HOLES_MEMORYMODEL
784 Support for TI's OMAP platform (OMAP1 and OMAP2).
789 select ARCH_REQUIRE_GPIOLIB
791 select GENERIC_CLOCKEVENTS
794 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
799 # This is sorted alphabetically by mach-* pathname. However, plat-*
800 # Kconfigs may be included either alphabetically (according to the
801 # plat- suffix) or along side the corresponding mach-* source.
803 source "arch/arm/mach-aaec2000/Kconfig"
805 source "arch/arm/mach-at91/Kconfig"
807 source "arch/arm/mach-bcmring/Kconfig"
809 source "arch/arm/mach-clps711x/Kconfig"
811 source "arch/arm/mach-cns3xxx/Kconfig"
813 source "arch/arm/mach-davinci/Kconfig"
815 source "arch/arm/mach-dove/Kconfig"
817 source "arch/arm/mach-ep93xx/Kconfig"
819 source "arch/arm/mach-footbridge/Kconfig"
821 source "arch/arm/mach-gemini/Kconfig"
823 source "arch/arm/mach-h720x/Kconfig"
825 source "arch/arm/mach-integrator/Kconfig"
827 source "arch/arm/mach-iop32x/Kconfig"
829 source "arch/arm/mach-iop33x/Kconfig"
831 source "arch/arm/mach-iop13xx/Kconfig"
833 source "arch/arm/mach-ixp4xx/Kconfig"
835 source "arch/arm/mach-ixp2000/Kconfig"
837 source "arch/arm/mach-ixp23xx/Kconfig"
839 source "arch/arm/mach-kirkwood/Kconfig"
841 source "arch/arm/mach-ks8695/Kconfig"
843 source "arch/arm/mach-lh7a40x/Kconfig"
845 source "arch/arm/mach-loki/Kconfig"
847 source "arch/arm/mach-msm/Kconfig"
849 source "arch/arm/mach-mv78xx0/Kconfig"
851 source "arch/arm/plat-mxc/Kconfig"
853 source "arch/arm/mach-netx/Kconfig"
855 source "arch/arm/mach-nomadik/Kconfig"
856 source "arch/arm/plat-nomadik/Kconfig"
858 source "arch/arm/mach-ns9xxx/Kconfig"
860 source "arch/arm/mach-nuc93x/Kconfig"
862 source "arch/arm/plat-omap/Kconfig"
864 source "arch/arm/mach-omap1/Kconfig"
866 source "arch/arm/mach-omap2/Kconfig"
868 source "arch/arm/mach-orion5x/Kconfig"
870 source "arch/arm/mach-pxa/Kconfig"
871 source "arch/arm/plat-pxa/Kconfig"
873 source "arch/arm/mach-mmp/Kconfig"
875 source "arch/arm/mach-realview/Kconfig"
877 source "arch/arm/mach-sa1100/Kconfig"
879 source "arch/arm/plat-samsung/Kconfig"
880 source "arch/arm/plat-s3c24xx/Kconfig"
881 source "arch/arm/plat-s5p/Kconfig"
883 source "arch/arm/plat-spear/Kconfig"
886 source "arch/arm/mach-s3c2400/Kconfig"
887 source "arch/arm/mach-s3c2410/Kconfig"
888 source "arch/arm/mach-s3c2412/Kconfig"
889 source "arch/arm/mach-s3c2416/Kconfig"
890 source "arch/arm/mach-s3c2440/Kconfig"
891 source "arch/arm/mach-s3c2443/Kconfig"
895 source "arch/arm/mach-s3c64xx/Kconfig"
898 source "arch/arm/mach-s5p6440/Kconfig"
900 source "arch/arm/mach-s5p6442/Kconfig"
902 source "arch/arm/mach-s5pc100/Kconfig"
904 source "arch/arm/mach-s5pv210/Kconfig"
906 source "arch/arm/mach-shmobile/Kconfig"
908 source "arch/arm/plat-stmp3xxx/Kconfig"
910 source "arch/arm/mach-u300/Kconfig"
912 source "arch/arm/mach-ux500/Kconfig"
914 source "arch/arm/mach-versatile/Kconfig"
916 source "arch/arm/mach-vexpress/Kconfig"
918 source "arch/arm/mach-w90x900/Kconfig"
920 # Definitions to make life easier
926 select GENERIC_CLOCKEVENTS
934 config PLAT_VERSATILE
937 config ARM_TIMER_SP804
940 source arch/arm/mm/Kconfig
943 bool "Enable iWMMXt support"
944 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
945 default y if PXA27x || PXA3xx || ARCH_MMP
947 Enable support for iWMMXt context switching at run time if
948 running on a CPU that supports it.
950 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
953 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
957 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
958 (!ARCH_OMAP3 || OMAP3_EMU)
963 source "arch/arm/Kconfig-nommu"
966 config ARM_ERRATA_411920
967 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
968 depends on CPU_V6 && !SMP
970 Invalidation of the Instruction Cache operation can
971 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
972 It does not affect the MPCore. This option enables the ARM Ltd.
973 recommended workaround.
975 config ARM_ERRATA_430973
976 bool "ARM errata: Stale prediction on replaced interworking branch"
979 This option enables the workaround for the 430973 Cortex-A8
980 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
981 interworking branch is replaced with another code sequence at the
982 same virtual address, whether due to self-modifying code or virtual
983 to physical address re-mapping, Cortex-A8 does not recover from the
984 stale interworking branch prediction. This results in Cortex-A8
985 executing the new code sequence in the incorrect ARM or Thumb state.
986 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
987 and also flushes the branch target cache at every context switch.
988 Note that setting specific bits in the ACTLR register may not be
989 available in non-secure mode.
991 config ARM_ERRATA_458693
992 bool "ARM errata: Processor deadlock when a false hazard is created"
995 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
996 erratum. For very specific sequences of memory operations, it is
997 possible for a hazard condition intended for a cache line to instead
998 be incorrectly associated with a different cache line. This false
999 hazard might then cause a processor deadlock. The workaround enables
1000 the L1 caching of the NEON accesses and disables the PLD instruction
1001 in the ACTLR register. Note that setting specific bits in the ACTLR
1002 register may not be available in non-secure mode.
1004 config ARM_ERRATA_460075
1005 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1008 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1009 erratum. Any asynchronous access to the L2 cache may encounter a
1010 situation in which recent store transactions to the L2 cache are lost
1011 and overwritten with stale memory contents from external memory. The
1012 workaround disables the write-allocate mode for the L2 cache via the
1013 ACTLR register. Note that setting specific bits in the ACTLR register
1014 may not be available in non-secure mode.
1016 config PL310_ERRATA_588369
1017 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1018 depends on CACHE_L2X0 && ARCH_OMAP4
1020 The PL310 L2 cache controller implements three types of Clean &
1021 Invalidate maintenance operations: by Physical Address
1022 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1023 They are architecturally defined to behave as the execution of a
1024 clean operation followed immediately by an invalidate operation,
1025 both performing to the same memory location. This functionality
1026 is not correctly implemented in PL310 as clean lines are not
1027 invalidated as a result of these operations. Note that this errata
1028 uses Texas Instrument's secure monitor api.
1030 config ARM_ERRATA_720789
1031 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1032 depends on CPU_V7 && SMP
1034 This option enables the workaround for the 720789 Cortex-A9 (prior to
1035 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1036 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1037 As a consequence of this erratum, some TLB entries which should be
1038 invalidated are not, resulting in an incoherency in the system page
1039 tables. The workaround changes the TLB flushing routines to invalidate
1040 entries regardless of the ASID.
1043 source "arch/arm/common/Kconfig"
1045 config FORCE_MAX_ZONEORDER
1058 Find out whether you have ISA slots on your motherboard. ISA is the
1059 name of a bus system, i.e. the way the CPU talks to the other stuff
1060 inside your box. Other bus systems are PCI, EISA, MicroChannel
1061 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1062 newer boards don't support it. If you have ISA, say Y, otherwise N.
1064 # Select ISA DMA controller support
1069 # Select ISA DMA interface
1074 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1076 Find out whether you have a PCI motherboard. PCI is the name of a
1077 bus system, i.e. the way the CPU talks to the other stuff inside
1078 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1079 VESA. If you have PCI, say Y, otherwise N.
1088 # Select the host bridge type
1089 config PCI_HOST_VIA82C505
1091 depends on PCI && ARCH_SHARK
1094 config PCI_HOST_ITE8152
1096 depends on PCI && MACH_ARMCORE
1100 source "drivers/pci/Kconfig"
1102 source "drivers/pcmcia/Kconfig"
1106 menu "Kernel Features"
1108 source "kernel/time/Kconfig"
1111 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1112 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1113 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1114 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1115 depends on GENERIC_CLOCKEVENTS
1116 select USE_GENERIC_SMP_HELPERS
1117 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1119 This enables support for systems with more than one CPU. If you have
1120 a system with only one CPU, like most personal computers, say N. If
1121 you have a system with more than one CPU, say Y.
1123 If you say N here, the kernel will run on single and multiprocessor
1124 machines, but will use only one CPU of a multiprocessor machine. If
1125 you say Y here, the kernel will run on many, but not all, single
1126 processor machines. On a single processor machine, the kernel will
1127 run faster if you say N here.
1129 See also <file:Documentation/i386/IO-APIC.txt>,
1130 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1131 <http://www.linuxdoc.org/docs.html#howto>.
1133 If you don't know what to do here, say N.
1139 This option enables support for the ARM system coherency unit
1145 This options enables support for the ARM timer and watchdog unit
1148 prompt "Memory split"
1151 Select the desired split between kernel and user memory.
1153 If you are not absolutely sure what you are doing, leave this
1157 bool "3G/1G user/kernel split"
1159 bool "2G/2G user/kernel split"
1161 bool "1G/3G user/kernel split"
1166 default 0x40000000 if VMSPLIT_1G
1167 default 0x80000000 if VMSPLIT_2G
1171 int "Maximum number of CPUs (2-32)"
1177 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1178 depends on SMP && HOTPLUG && EXPERIMENTAL
1180 Say Y here to experiment with turning CPUs off and on. CPUs
1181 can be controlled through /sys/devices/system/cpu.
1184 bool "Use local timer interrupts"
1185 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1186 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1188 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1190 Enable support for local timers on SMP platforms, rather then the
1191 legacy IPI broadcast method. Local timers allows the system
1192 accounting to be spread across the timer interval, preventing a
1193 "thundering herd" at every timer tick.
1195 source kernel/Kconfig.preempt
1199 default 128 if ARCH_L7200
1200 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1201 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1202 default AT91_TIMER_HZ if ARCH_AT91
1205 config THUMB2_KERNEL
1206 bool "Compile the kernel in Thumb-2 mode"
1207 depends on CPU_V7 && EXPERIMENTAL
1209 select ARM_ASM_UNIFIED
1211 By enabling this option, the kernel will be compiled in
1212 Thumb-2 mode. A compiler/assembler that understand the unified
1213 ARM-Thumb syntax is needed.
1217 config ARM_ASM_UNIFIED
1221 bool "Use the ARM EABI to compile the kernel"
1223 This option allows for the kernel to be compiled using the latest
1224 ARM ABI (aka EABI). This is only useful if you are using a user
1225 space environment that is also compiled with EABI.
1227 Since there are major incompatibilities between the legacy ABI and
1228 EABI, especially with regard to structure member alignment, this
1229 option also changes the kernel syscall calling convention to
1230 disambiguate both ABIs and allow for backward compatibility support
1231 (selected with CONFIG_OABI_COMPAT).
1233 To use this you need GCC version 4.0.0 or later.
1236 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1237 depends on AEABI && EXPERIMENTAL
1240 This option preserves the old syscall interface along with the
1241 new (ARM EABI) one. It also provides a compatibility layer to
1242 intercept syscalls that have structure arguments which layout
1243 in memory differs between the legacy ABI and the new ARM EABI
1244 (only for non "thumb" binaries). This option adds a tiny
1245 overhead to all syscalls and produces a slightly larger kernel.
1246 If you know you'll be using only pure EABI user space then you
1247 can say N here. If this option is not selected and you attempt
1248 to execute a legacy ABI binary then the result will be
1249 UNPREDICTABLE (in fact it can be predicted that it won't work
1250 at all). If in doubt say Y.
1252 config ARCH_HAS_HOLES_MEMORYMODEL
1255 # Discontigmem is deprecated
1256 config ARCH_DISCONTIGMEM_ENABLE
1259 config ARCH_SPARSEMEM_ENABLE
1262 config ARCH_SPARSEMEM_DEFAULT
1263 def_bool ARCH_SPARSEMEM_ENABLE
1265 config ARCH_SELECT_MEMORY_MODEL
1266 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1270 default "4" if ARCH_LH7A40X
1272 depends on NEED_MULTIPLE_NODES
1275 bool "High Memory Support (EXPERIMENTAL)"
1276 depends on MMU && EXPERIMENTAL
1278 The address space of ARM processors is only 4 Gigabytes large
1279 and it has to accommodate user address space, kernel address
1280 space as well as some memory mapped IO. That means that, if you
1281 have a large amount of physical memory and/or IO, not all of the
1282 memory can be "permanently mapped" by the kernel. The physical
1283 memory that is not permanently mapped is called "high memory".
1285 Depending on the selected kernel/user memory split, minimum
1286 vmalloc space and actual amount of RAM, you may not need this
1287 option which should result in a slightly faster kernel.
1292 bool "Allocate 2nd-level pagetables from highmem"
1294 depends on !OUTER_CACHE
1296 config HW_PERF_EVENTS
1297 bool "Enable hardware performance counter support for perf events"
1298 depends on PERF_EVENTS && CPU_HAS_PMU
1301 Enable hardware performance counter support for perf events. If
1302 disabled, perf events will use software events only.
1307 bool "Timer and CPU usage LEDs"
1308 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1309 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1310 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1311 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1312 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1313 ARCH_AT91 || ARCH_DAVINCI || \
1314 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1316 If you say Y here, the LEDs on your machine will be used
1317 to provide useful information about your current system status.
1319 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1320 be able to select which LEDs are active using the options below. If
1321 you are compiling a kernel for the EBSA-110 or the LART however, the
1322 red LED will simply flash regularly to indicate that the system is
1323 still functional. It is safe to say Y here if you have a CATS
1324 system, but the driver will do nothing.
1327 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1328 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1329 || MACH_OMAP_PERSEUS2
1331 depends on !GENERIC_CLOCKEVENTS
1332 default y if ARCH_EBSA110
1334 If you say Y here, one of the system LEDs (the green one on the
1335 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1336 will flash regularly to indicate that the system is still
1337 operational. This is mainly useful to kernel hackers who are
1338 debugging unstable kernels.
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.
1345 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1347 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1348 || MACH_OMAP_PERSEUS2
1351 If you say Y here, the red LED will be used to give a good real
1352 time indication of CPU usage, by lighting whenever the idle task
1353 is not currently executing.
1355 The LART uses the same LED for both Timer LED and CPU usage LED
1356 functions. You may choose to use both, but the Timer LED function
1357 will overrule the CPU usage LED.
1359 config ALIGNMENT_TRAP
1361 depends on CPU_CP15_MMU
1362 default y if !ARCH_EBSA110
1363 select HAVE_PROC_CPU if PROC_FS
1365 ARM processors cannot fetch/store information which is not
1366 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1367 address divisible by 4. On 32-bit ARM processors, these non-aligned
1368 fetch/store instructions will be emulated in software if you say
1369 here, which has a severe performance impact. This is necessary for
1370 correct operation of some network protocols. With an IP-only
1371 configuration it is safe to say N, otherwise say Y.
1373 config UACCESS_WITH_MEMCPY
1374 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1375 depends on MMU && EXPERIMENTAL
1376 default y if CPU_FEROCEON
1378 Implement faster copy_to_user and clear_user methods for CPU
1379 cores where a 8-word STM instruction give significantly higher
1380 memory write throughput than a sequence of individual 32bit stores.
1382 A possible side effect is a slight increase in scheduling latency
1383 between threads sharing the same address space if they invoke
1384 such copy operations with large buffers.
1386 However, if the CPU data cache is using a write-allocate mode,
1387 this option is unlikely to provide any performance gain.
1393 # Compressed boot loader in ROM. Yes, we really want to ask about
1394 # TEXT and BSS so we preserve their values in the config files.
1395 config ZBOOT_ROM_TEXT
1396 hex "Compressed ROM boot loader base address"
1399 The physical address at which the ROM-able zImage is to be
1400 placed in the target. Platforms which normally make use of
1401 ROM-able zImage formats normally set this to a suitable
1402 value in their defconfig file.
1404 If ZBOOT_ROM is not enabled, this has no effect.
1406 config ZBOOT_ROM_BSS
1407 hex "Compressed ROM boot loader BSS address"
1410 The base address of an area of read/write memory in the target
1411 for the ROM-able zImage which must be available while the
1412 decompressor is running. It must be large enough to hold the
1413 entire decompressed kernel plus an additional 128 KiB.
1414 Platforms which normally make use of ROM-able zImage formats
1415 normally set this to a suitable value in their defconfig file.
1417 If ZBOOT_ROM is not enabled, this has no effect.
1420 bool "Compressed boot loader in ROM/flash"
1421 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1423 Say Y here if you intend to execute your compressed kernel image
1424 (zImage) directly from ROM or flash. If unsure, say N.
1427 string "Default kernel command string"
1430 On some architectures (EBSA110 and CATS), there is currently no way
1431 for the boot loader to pass arguments to the kernel. For these
1432 architectures, you should supply some command-line options at build
1433 time by entering them here. As a minimum, you should specify the
1434 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1436 config CMDLINE_FORCE
1437 bool "Always use the default kernel command string"
1438 depends on CMDLINE != ""
1440 Always use the default kernel command string, even if the boot
1441 loader passes other arguments to the kernel.
1442 This is useful if you cannot or don't want to change the
1443 command-line options your boot loader passes to the kernel.
1448 bool "Kernel Execute-In-Place from ROM"
1449 depends on !ZBOOT_ROM
1451 Execute-In-Place allows the kernel to run from non-volatile storage
1452 directly addressable by the CPU, such as NOR flash. This saves RAM
1453 space since the text section of the kernel is not loaded from flash
1454 to RAM. Read-write sections, such as the data section and stack,
1455 are still copied to RAM. The XIP kernel is not compressed since
1456 it has to run directly from flash, so it will take more space to
1457 store it. The flash address used to link the kernel object files,
1458 and for storing it, is configuration dependent. Therefore, if you
1459 say Y here, you must know the proper physical address where to
1460 store the kernel image depending on your own flash memory usage.
1462 Also note that the make target becomes "make xipImage" rather than
1463 "make zImage" or "make Image". The final kernel binary to put in
1464 ROM memory will be arch/arm/boot/xipImage.
1468 config XIP_PHYS_ADDR
1469 hex "XIP Kernel Physical Location"
1470 depends on XIP_KERNEL
1471 default "0x00080000"
1473 This is the physical address in your flash memory the kernel will
1474 be linked for and stored to. This address is dependent on your
1478 bool "Kexec system call (EXPERIMENTAL)"
1479 depends on EXPERIMENTAL
1481 kexec is a system call that implements the ability to shutdown your
1482 current kernel, and to start another kernel. It is like a reboot
1483 but it is independent of the system firmware. And like a reboot
1484 you can start any kernel with it, not just Linux.
1486 It is an ongoing process to be certain the hardware in a machine
1487 is properly shutdown, so do not be surprised if this code does not
1488 initially work for you. It may help to enable device hotplugging
1492 bool "Export atags in procfs"
1496 Should the atags used to boot the kernel be exported in an "atags"
1497 file in procfs. Useful with kexec.
1501 menu "CPU Power Management"
1505 source "drivers/cpufreq/Kconfig"
1507 config CPU_FREQ_SA1100
1510 config CPU_FREQ_SA1110
1513 config CPU_FREQ_INTEGRATOR
1514 tristate "CPUfreq driver for ARM Integrator CPUs"
1515 depends on ARCH_INTEGRATOR && CPU_FREQ
1518 This enables the CPUfreq driver for ARM Integrator CPUs.
1520 For details, take a look at <file:Documentation/cpu-freq>.
1526 depends on CPU_FREQ && ARCH_PXA && PXA25x
1528 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1530 config CPU_FREQ_S3C64XX
1531 bool "CPUfreq support for Samsung S3C64XX CPUs"
1532 depends on CPU_FREQ && CPU_S3C6410
1537 Internal configuration node for common cpufreq on Samsung SoC
1539 config CPU_FREQ_S3C24XX
1540 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1541 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1544 This enables the CPUfreq driver for the Samsung S3C24XX family
1547 For details, take a look at <file:Documentation/cpu-freq>.
1551 config CPU_FREQ_S3C24XX_PLL
1552 bool "Support CPUfreq changing of PLL frequency"
1553 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1555 Compile in support for changing the PLL frequency from the
1556 S3C24XX series CPUfreq driver. The PLL takes time to settle
1557 after a frequency change, so by default it is not enabled.
1559 This also means that the PLL tables for the selected CPU(s) will
1560 be built which may increase the size of the kernel image.
1562 config CPU_FREQ_S3C24XX_DEBUG
1563 bool "Debug CPUfreq Samsung driver core"
1564 depends on CPU_FREQ_S3C24XX
1566 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1568 config CPU_FREQ_S3C24XX_IODEBUG
1569 bool "Debug CPUfreq Samsung driver IO timing"
1570 depends on CPU_FREQ_S3C24XX
1572 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1574 config CPU_FREQ_S3C24XX_DEBUGFS
1575 bool "Export debugfs for CPUFreq"
1576 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1578 Export status information via debugfs.
1582 source "drivers/cpuidle/Kconfig"
1586 menu "Floating point emulation"
1588 comment "At least one emulation must be selected"
1591 bool "NWFPE math emulation"
1592 depends on !AEABI || OABI_COMPAT
1594 Say Y to include the NWFPE floating point emulator in the kernel.
1595 This is necessary to run most binaries. Linux does not currently
1596 support floating point hardware so you need to say Y here even if
1597 your machine has an FPA or floating point co-processor podule.
1599 You may say N here if you are going to load the Acorn FPEmulator
1600 early in the bootup.
1603 bool "Support extended precision"
1604 depends on FPE_NWFPE
1606 Say Y to include 80-bit support in the kernel floating-point
1607 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1608 Note that gcc does not generate 80-bit operations by default,
1609 so in most cases this option only enlarges the size of the
1610 floating point emulator without any good reason.
1612 You almost surely want to say N here.
1615 bool "FastFPE math emulation (EXPERIMENTAL)"
1616 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1618 Say Y here to include the FAST floating point emulator in the kernel.
1619 This is an experimental much faster emulator which now also has full
1620 precision for the mantissa. It does not support any exceptions.
1621 It is very simple, and approximately 3-6 times faster than NWFPE.
1623 It should be sufficient for most programs. It may be not suitable
1624 for scientific calculations, but you have to check this for yourself.
1625 If you do not feel you need a faster FP emulation you should better
1629 bool "VFP-format floating point maths"
1630 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1632 Say Y to include VFP support code in the kernel. This is needed
1633 if your hardware includes a VFP unit.
1635 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1636 release notes and additional status information.
1638 Say N if your target does not have VFP hardware.
1646 bool "Advanced SIMD (NEON) Extension support"
1647 depends on VFPv3 && CPU_V7
1649 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1654 menu "Userspace binary formats"
1656 source "fs/Kconfig.binfmt"
1659 tristate "RISC OS personality"
1662 Say Y here to include the kernel code necessary if you want to run
1663 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1664 experimental; if this sounds frightening, say N and sleep in peace.
1665 You can also say M here to compile this support as a module (which
1666 will be called arthur).
1670 menu "Power management options"
1672 source "kernel/power/Kconfig"
1674 config ARCH_SUSPEND_POSSIBLE
1679 source "net/Kconfig"
1681 source "drivers/Kconfig"
1685 source "arch/arm/Kconfig.debug"
1687 source "security/Kconfig"
1689 source "crypto/Kconfig"
1691 source "lib/Kconfig"