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
27 select HAVE_REGS_AND_STACK_ACCESS_API
29 The ARM series is a line of low-power-consumption RISC chip designs
30 licensed by ARM Ltd and targeted at embedded applications and
31 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
32 manufactured, but legacy ARM-based PC hardware remains popular in
33 Europe. There is an ARM Linux project with a web page at
34 <http://www.arm.linux.org.uk/>.
39 config SYS_SUPPORTS_APM_EMULATION
49 config ARCH_USES_GETTIMEOFFSET
53 config GENERIC_CLOCKEVENTS
56 config GENERIC_CLOCKEVENTS_BROADCAST
58 depends on GENERIC_CLOCKEVENTS
59 default y if SMP && !LOCAL_TIMERS
63 select GENERIC_ALLOCATOR
74 The Extended Industry Standard Architecture (EISA) bus was
75 developed as an open alternative to the IBM MicroChannel bus.
77 The EISA bus provided some of the features of the IBM MicroChannel
78 bus while maintaining backward compatibility with cards made for
79 the older ISA bus. The EISA bus saw limited use between 1988 and
80 1995 when it was made obsolete by the PCI bus.
82 Say Y here if you are building a kernel for an EISA-based machine.
92 MicroChannel Architecture is found in some IBM PS/2 machines and
93 laptops. It is a bus system similar to PCI or ISA. See
94 <file:Documentation/mca.txt> (and especially the web page given
95 there) before attempting to build an MCA bus kernel.
97 config GENERIC_HARDIRQS
101 config STACKTRACE_SUPPORT
105 config HAVE_LATENCYTOP_SUPPORT
110 config LOCKDEP_SUPPORT
114 config TRACE_IRQFLAGS_SUPPORT
118 config HARDIRQS_SW_RESEND
122 config GENERIC_IRQ_PROBE
126 config GENERIC_LOCKBREAK
129 depends on SMP && PREEMPT
131 config RWSEM_GENERIC_SPINLOCK
135 config RWSEM_XCHGADD_ALGORITHM
138 config ARCH_HAS_ILOG2_U32
141 config ARCH_HAS_ILOG2_U64
144 config ARCH_HAS_CPUFREQ
147 Internal node to signify that the ARCH has CPUFREQ support
148 and that the relevant menu configurations are displayed for
151 config GENERIC_HWEIGHT
155 config GENERIC_CALIBRATE_DELAY
159 config ARCH_MAY_HAVE_PC_FDC
165 config NEED_DMA_MAP_STATE
168 config GENERIC_ISA_DMA
177 config GENERIC_HARDIRQS_NO__DO_IRQ
180 config ARM_L1_CACHE_SHIFT_6
183 Setting ARM L1 cache line size to 64 Bytes.
187 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
188 default DRAM_BASE if REMAP_VECTORS_TO_RAM
191 The base address of exception vectors.
193 source "init/Kconfig"
195 source "kernel/Kconfig.freezer"
200 bool "MMU-based Paged Memory Management Support"
203 Select if you want MMU-based virtualised addressing space
204 support by paged memory management. If unsure, say 'Y'.
207 # The "ARM system type" choice list is ordered alphabetically by option
208 # text. Please add new entries in the option alphabetic order.
211 prompt "ARM system type"
212 default ARCH_VERSATILE
215 bool "Agilent AAEC-2000 based"
219 select ARCH_USES_GETTIMEOFFSET
221 This enables support for systems based on the Agilent AAEC-2000
223 config ARCH_INTEGRATOR
224 bool "ARM Ltd. Integrator family"
226 select ARCH_HAS_CPUFREQ
229 select GENERIC_CLOCKEVENTS
230 select PLAT_VERSATILE
232 Support for ARM's Integrator platform.
235 bool "ARM Ltd. RealView family"
239 select GENERIC_CLOCKEVENTS
240 select ARCH_WANT_OPTIONAL_GPIOLIB
241 select PLAT_VERSATILE
242 select ARM_TIMER_SP804
243 select GPIO_PL061 if GPIOLIB
245 This enables support for ARM Ltd RealView boards.
247 config ARCH_VERSATILE
248 bool "ARM Ltd. Versatile family"
253 select GENERIC_CLOCKEVENTS
254 select ARCH_WANT_OPTIONAL_GPIOLIB
255 select PLAT_VERSATILE
256 select ARM_TIMER_SP804
258 This enables support for ARM Ltd Versatile board.
261 bool "ARM Ltd. Versatile Express family"
262 select ARCH_WANT_OPTIONAL_GPIOLIB
264 select ARM_TIMER_SP804
266 select GENERIC_CLOCKEVENTS
269 select PLAT_VERSATILE
271 This enables support for the ARM Ltd Versatile Express boards.
275 select ARCH_REQUIRE_GPIOLIB
277 select ARCH_USES_GETTIMEOFFSET
279 This enables support for systems based on the Atmel AT91RM9200,
280 AT91SAM9 and AT91CAP9 processors.
283 bool "Broadcom BCMRING"
288 select GENERIC_CLOCKEVENTS
289 select ARCH_WANT_OPTIONAL_GPIOLIB
291 Support for Broadcom's BCMRing platform.
294 bool "Cirrus Logic CLPS711x/EP721x-based"
296 select ARCH_USES_GETTIMEOFFSET
298 Support for Cirrus Logic 711x/721x based boards.
301 bool "Cavium Networks CNS3XXX family"
303 select GENERIC_CLOCKEVENTS
306 Support for Cavium Networks CNS3XXX platform.
309 bool "Cortina Systems Gemini"
311 select ARCH_REQUIRE_GPIOLIB
312 select ARCH_USES_GETTIMEOFFSET
314 Support for the Cortina Systems Gemini family SoCs
321 select ARCH_USES_GETTIMEOFFSET
323 This is an evaluation board for the StrongARM processor available
324 from Digital. It has limited hardware on-board, including an
325 Ethernet interface, two PCMCIA sockets, two serial ports and a
334 select ARCH_REQUIRE_GPIOLIB
335 select ARCH_HAS_HOLES_MEMORYMODEL
336 select ARCH_USES_GETTIMEOFFSET
338 This enables support for the Cirrus EP93xx series of CPUs.
340 config ARCH_FOOTBRIDGE
344 select ARCH_USES_GETTIMEOFFSET
346 Support for systems based on the DC21285 companion chip
347 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
350 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
362 select GENERIC_CLOCKEVENTS
363 select USB_ARCH_HAS_EHCI
365 Support for systems based on the Freescale 3xxx CPUs.
368 bool "Hilscher NetX based"
371 select GENERIC_CLOCKEVENTS
373 This enables support for systems based on the Hilscher NetX Soc
376 bool "Hynix HMS720x-based"
379 select ARCH_USES_GETTIMEOFFSET
381 This enables support for systems based on the Hynix HMS720x
389 select ARCH_SUPPORTS_MSI
392 Support for Intel's IOP13XX (XScale) family of processors.
400 select ARCH_REQUIRE_GPIOLIB
402 Support for Intel's 80219 and IOP32X (XScale) family of
411 select ARCH_REQUIRE_GPIOLIB
413 Support for Intel's IOP33X (XScale) family of processors.
420 select ARCH_USES_GETTIMEOFFSET
422 Support for Intel's IXP23xx (XScale) family of processors.
425 bool "IXP2400/2800-based"
429 select ARCH_USES_GETTIMEOFFSET
431 Support for Intel's IXP2400/2800 (XScale) family of processors.
438 select GENERIC_CLOCKEVENTS
439 select DMABOUNCE if PCI
441 Support for Intel's IXP4XX (XScale) family of processors.
447 select ARCH_USES_GETTIMEOFFSET
449 Say Y here if you intend to run this kernel on a LinkUp Systems
450 L7200 Software Development Board which uses an ARM720T processor.
451 Information on this board can be obtained at:
453 <http://www.linkupsys.com/>
455 If you have any questions or comments about the Linux kernel port
456 to this board, send e-mail to <sjhill@cotw.com>.
461 select ARCH_REQUIRE_GPIOLIB
462 select GENERIC_CLOCKEVENTS
465 Support for the Marvell Dove SoC 88AP510
468 bool "Marvell Kirkwood"
471 select ARCH_REQUIRE_GPIOLIB
472 select GENERIC_CLOCKEVENTS
475 Support for the following Marvell Kirkwood series SoCs:
476 88F6180, 88F6192 and 88F6281.
479 bool "Marvell Loki (88RC8480)"
481 select GENERIC_CLOCKEVENTS
484 Support for the Marvell Loki (88RC8480) SoC.
487 bool "Marvell MV78xx0"
490 select ARCH_REQUIRE_GPIOLIB
491 select GENERIC_CLOCKEVENTS
494 Support for the following Marvell MV78xx0 series SoCs:
502 select ARCH_REQUIRE_GPIOLIB
503 select GENERIC_CLOCKEVENTS
506 Support for the following Marvell Orion 5x series SoCs:
507 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
508 Orion-2 (5281), Orion-1-90 (6183).
511 bool "Marvell PXA168/910/MMP2"
513 select ARCH_REQUIRE_GPIOLIB
515 select GENERIC_CLOCKEVENTS
519 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
522 bool "Micrel/Kendin KS8695"
524 select ARCH_REQUIRE_GPIOLIB
525 select ARCH_USES_GETTIMEOFFSET
527 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
528 System-on-Chip devices.
531 bool "NetSilicon NS9xxx"
534 select GENERIC_CLOCKEVENTS
537 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
540 <http://www.digi.com/products/microprocessors/index.jsp>
543 bool "Nuvoton W90X900 CPU"
545 select ARCH_REQUIRE_GPIOLIB
547 select GENERIC_CLOCKEVENTS
549 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
550 At present, the w90x900 has been renamed nuc900, regarding
551 the ARM series product line, you can login the following
552 link address to know more.
554 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
555 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
558 bool "Nuvoton NUC93X CPU"
562 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
563 low-power and high performance MPEG-4/JPEG multimedia controller chip.
566 bool "Philips Nexperia PNX4008 Mobile"
569 select ARCH_USES_GETTIMEOFFSET
571 This enables support for Philips PNX4008 mobile platform.
574 bool "PXA2xx/PXA3xx-based"
577 select ARCH_HAS_CPUFREQ
579 select ARCH_REQUIRE_GPIOLIB
580 select GENERIC_CLOCKEVENTS
584 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
589 select GENERIC_CLOCKEVENTS
591 Support for Qualcomm MSM/QSD based systems. This runs on the
592 apps processor of the MSM/QSD and depends on a shared memory
593 interface to the modem processor which runs the baseband
594 stack and controls some vital subsystems
595 (clock and power control, etc).
598 bool "Renesas SH-Mobile"
600 Support for Renesas's SH-Mobile ARM platforms
607 select ARCH_MAY_HAVE_PC_FDC
608 select HAVE_PATA_PLATFORM
611 select ARCH_SPARSEMEM_ENABLE
612 select ARCH_USES_GETTIMEOFFSET
614 On the Acorn Risc-PC, Linux can support the internal IDE disk and
615 CD-ROM interface, serial and parallel port, and the floppy drive.
621 select ARCH_SPARSEMEM_ENABLE
623 select ARCH_HAS_CPUFREQ
625 select GENERIC_CLOCKEVENTS
628 select ARCH_REQUIRE_GPIOLIB
630 Support for StrongARM 11x0 based boards.
633 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
635 select ARCH_HAS_CPUFREQ
637 select ARCH_USES_GETTIMEOFFSET
639 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
640 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
641 the Samsung SMDK2410 development board (and derivatives).
643 Note, the S3C2416 and the S3C2450 are so close that they even share
644 the same SoC ID code. This means that there is no seperate machine
645 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
648 bool "Samsung S3C64XX"
654 select ARCH_USES_GETTIMEOFFSET
655 select ARCH_HAS_CPUFREQ
656 select ARCH_REQUIRE_GPIOLIB
657 select SAMSUNG_CLKSRC
658 select SAMSUNG_IRQ_VIC_TIMER
659 select SAMSUNG_IRQ_UART
660 select S3C_GPIO_TRACK
661 select S3C_GPIO_PULL_UPDOWN
662 select S3C_GPIO_CFG_S3C24XX
663 select S3C_GPIO_CFG_S3C64XX
665 select USB_ARCH_HAS_OHCI
666 select SAMSUNG_GPIOLIB_4BIT
668 Samsung S3C64XX series based systems
671 bool "Samsung S5P6440"
675 select ARCH_USES_GETTIMEOFFSET
677 Samsung S5P6440 CPU based systems
680 bool "Samsung S5P6442"
684 select ARCH_USES_GETTIMEOFFSET
686 Samsung S5P6442 CPU based systems
689 bool "Samsung S5PC100"
693 select ARM_L1_CACHE_SHIFT_6
694 select ARCH_USES_GETTIMEOFFSET
696 Samsung S5PC100 series based systems
699 bool "Samsung S5PV210/S5PC110"
703 select ARM_L1_CACHE_SHIFT_6
704 select ARCH_USES_GETTIMEOFFSET
706 Samsung S5PV210/S5PC110 series based systems
715 select ARCH_USES_GETTIMEOFFSET
717 Support for the StrongARM based Digital DNARD machine, also known
718 as "Shark" (<http://www.shark-linux.de/shark.html>).
723 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
724 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
725 select ARCH_USES_GETTIMEOFFSET
727 Say Y here for systems based on one of the Sharp LH7A40X
728 System on a Chip processors. These CPUs include an ARM922T
729 core with a wide array of integrated devices for
730 hand-held and low-power applications.
733 bool "ST-Ericsson U300 Series"
739 select GENERIC_CLOCKEVENTS
743 Support for ST-Ericsson U300 series mobile platforms.
746 bool "ST-Ericsson U8500 Series"
749 select GENERIC_CLOCKEVENTS
751 select ARCH_REQUIRE_GPIOLIB
753 Support for ST-Ericsson's Ux500 architecture
756 bool "STMicroelectronics Nomadik"
761 select GENERIC_CLOCKEVENTS
762 select ARCH_REQUIRE_GPIOLIB
764 Support for the Nomadik platform by ST-Ericsson
768 select GENERIC_CLOCKEVENTS
769 select ARCH_REQUIRE_GPIOLIB
773 select GENERIC_ALLOCATOR
774 select ARCH_HAS_HOLES_MEMORYMODEL
776 Support for TI's DaVinci platform.
781 select ARCH_REQUIRE_GPIOLIB
782 select ARCH_HAS_CPUFREQ
783 select GENERIC_CLOCKEVENTS
784 select ARCH_HAS_HOLES_MEMORYMODEL
786 Support for TI's OMAP platform (OMAP1 and OMAP2).
791 select ARCH_REQUIRE_GPIOLIB
793 select GENERIC_CLOCKEVENTS
796 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
801 # This is sorted alphabetically by mach-* pathname. However, plat-*
802 # Kconfigs may be included either alphabetically (according to the
803 # plat- suffix) or along side the corresponding mach-* source.
805 source "arch/arm/mach-aaec2000/Kconfig"
807 source "arch/arm/mach-at91/Kconfig"
809 source "arch/arm/mach-bcmring/Kconfig"
811 source "arch/arm/mach-clps711x/Kconfig"
813 source "arch/arm/mach-cns3xxx/Kconfig"
815 source "arch/arm/mach-davinci/Kconfig"
817 source "arch/arm/mach-dove/Kconfig"
819 source "arch/arm/mach-ep93xx/Kconfig"
821 source "arch/arm/mach-footbridge/Kconfig"
823 source "arch/arm/mach-gemini/Kconfig"
825 source "arch/arm/mach-h720x/Kconfig"
827 source "arch/arm/mach-integrator/Kconfig"
829 source "arch/arm/mach-iop32x/Kconfig"
831 source "arch/arm/mach-iop33x/Kconfig"
833 source "arch/arm/mach-iop13xx/Kconfig"
835 source "arch/arm/mach-ixp4xx/Kconfig"
837 source "arch/arm/mach-ixp2000/Kconfig"
839 source "arch/arm/mach-ixp23xx/Kconfig"
841 source "arch/arm/mach-kirkwood/Kconfig"
843 source "arch/arm/mach-ks8695/Kconfig"
845 source "arch/arm/mach-lh7a40x/Kconfig"
847 source "arch/arm/mach-loki/Kconfig"
849 source "arch/arm/mach-msm/Kconfig"
851 source "arch/arm/mach-mv78xx0/Kconfig"
853 source "arch/arm/plat-mxc/Kconfig"
855 source "arch/arm/mach-netx/Kconfig"
857 source "arch/arm/mach-nomadik/Kconfig"
858 source "arch/arm/plat-nomadik/Kconfig"
860 source "arch/arm/mach-ns9xxx/Kconfig"
862 source "arch/arm/mach-nuc93x/Kconfig"
864 source "arch/arm/plat-omap/Kconfig"
866 source "arch/arm/mach-omap1/Kconfig"
868 source "arch/arm/mach-omap2/Kconfig"
870 source "arch/arm/mach-orion5x/Kconfig"
872 source "arch/arm/mach-pxa/Kconfig"
873 source "arch/arm/plat-pxa/Kconfig"
875 source "arch/arm/mach-mmp/Kconfig"
877 source "arch/arm/mach-realview/Kconfig"
879 source "arch/arm/mach-sa1100/Kconfig"
881 source "arch/arm/plat-samsung/Kconfig"
882 source "arch/arm/plat-s3c24xx/Kconfig"
883 source "arch/arm/plat-s5p/Kconfig"
885 source "arch/arm/plat-spear/Kconfig"
888 source "arch/arm/mach-s3c2400/Kconfig"
889 source "arch/arm/mach-s3c2410/Kconfig"
890 source "arch/arm/mach-s3c2412/Kconfig"
891 source "arch/arm/mach-s3c2416/Kconfig"
892 source "arch/arm/mach-s3c2440/Kconfig"
893 source "arch/arm/mach-s3c2443/Kconfig"
897 source "arch/arm/mach-s3c64xx/Kconfig"
900 source "arch/arm/mach-s5p6440/Kconfig"
902 source "arch/arm/mach-s5p6442/Kconfig"
904 source "arch/arm/mach-s5pc100/Kconfig"
906 source "arch/arm/mach-s5pv210/Kconfig"
908 source "arch/arm/mach-shmobile/Kconfig"
910 source "arch/arm/plat-stmp3xxx/Kconfig"
912 source "arch/arm/mach-u300/Kconfig"
914 source "arch/arm/mach-ux500/Kconfig"
916 source "arch/arm/mach-versatile/Kconfig"
918 source "arch/arm/mach-vexpress/Kconfig"
920 source "arch/arm/mach-w90x900/Kconfig"
922 # Definitions to make life easier
928 select GENERIC_CLOCKEVENTS
936 config PLAT_VERSATILE
939 config ARM_TIMER_SP804
942 source arch/arm/mm/Kconfig
945 bool "Enable iWMMXt support"
946 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
947 default y if PXA27x || PXA3xx || ARCH_MMP
949 Enable support for iWMMXt context switching at run time if
950 running on a CPU that supports it.
952 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
955 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
959 depends on CPU_V6 || CPU_V7 || XSCALE_PMU
964 source "arch/arm/Kconfig-nommu"
967 config ARM_ERRATA_411920
968 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
969 depends on CPU_V6 && !SMP
971 Invalidation of the Instruction Cache operation can
972 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
973 It does not affect the MPCore. This option enables the ARM Ltd.
974 recommended workaround.
976 config ARM_ERRATA_430973
977 bool "ARM errata: Stale prediction on replaced interworking branch"
980 This option enables the workaround for the 430973 Cortex-A8
981 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
982 interworking branch is replaced with another code sequence at the
983 same virtual address, whether due to self-modifying code or virtual
984 to physical address re-mapping, Cortex-A8 does not recover from the
985 stale interworking branch prediction. This results in Cortex-A8
986 executing the new code sequence in the incorrect ARM or Thumb state.
987 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
988 and also flushes the branch target cache at every context switch.
989 Note that setting specific bits in the ACTLR register may not be
990 available in non-secure mode.
992 config ARM_ERRATA_458693
993 bool "ARM errata: Processor deadlock when a false hazard is created"
996 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
997 erratum. For very specific sequences of memory operations, it is
998 possible for a hazard condition intended for a cache line to instead
999 be incorrectly associated with a different cache line. This false
1000 hazard might then cause a processor deadlock. The workaround enables
1001 the L1 caching of the NEON accesses and disables the PLD instruction
1002 in the ACTLR register. Note that setting specific bits in the ACTLR
1003 register may not be available in non-secure mode.
1005 config ARM_ERRATA_460075
1006 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1009 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1010 erratum. Any asynchronous access to the L2 cache may encounter a
1011 situation in which recent store transactions to the L2 cache are lost
1012 and overwritten with stale memory contents from external memory. The
1013 workaround disables the write-allocate mode for the L2 cache via the
1014 ACTLR register. Note that setting specific bits in the ACTLR register
1015 may not be available in non-secure mode.
1017 config PL310_ERRATA_588369
1018 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1019 depends on CACHE_L2X0 && ARCH_OMAP4
1021 The PL310 L2 cache controller implements three types of Clean &
1022 Invalidate maintenance operations: by Physical Address
1023 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1024 They are architecturally defined to behave as the execution of a
1025 clean operation followed immediately by an invalidate operation,
1026 both performing to the same memory location. This functionality
1027 is not correctly implemented in PL310 as clean lines are not
1028 invalidated as a result of these operations. Note that this errata
1029 uses Texas Instrument's secure monitor api.
1032 source "arch/arm/common/Kconfig"
1034 config FORCE_MAX_ZONEORDER
1047 Find out whether you have ISA slots on your motherboard. ISA is the
1048 name of a bus system, i.e. the way the CPU talks to the other stuff
1049 inside your box. Other bus systems are PCI, EISA, MicroChannel
1050 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1051 newer boards don't support it. If you have ISA, say Y, otherwise N.
1053 # Select ISA DMA controller support
1058 # Select ISA DMA interface
1063 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1065 Find out whether you have a PCI motherboard. PCI is the name of a
1066 bus system, i.e. the way the CPU talks to the other stuff inside
1067 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1068 VESA. If you have PCI, say Y, otherwise N.
1077 # Select the host bridge type
1078 config PCI_HOST_VIA82C505
1080 depends on PCI && ARCH_SHARK
1083 config PCI_HOST_ITE8152
1085 depends on PCI && MACH_ARMCORE
1089 source "drivers/pci/Kconfig"
1091 source "drivers/pcmcia/Kconfig"
1095 menu "Kernel Features"
1097 source "kernel/time/Kconfig"
1100 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1101 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1102 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1103 ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1104 depends on GENERIC_CLOCKEVENTS
1105 select USE_GENERIC_SMP_HELPERS
1106 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1108 This enables support for systems with more than one CPU. If you have
1109 a system with only one CPU, like most personal computers, say N. If
1110 you have a system with more than one CPU, say Y.
1112 If you say N here, the kernel will run on single and multiprocessor
1113 machines, but will use only one CPU of a multiprocessor machine. If
1114 you say Y here, the kernel will run on many, but not all, single
1115 processor machines. On a single processor machine, the kernel will
1116 run faster if you say N here.
1118 See also <file:Documentation/i386/IO-APIC.txt>,
1119 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1120 <http://www.linuxdoc.org/docs.html#howto>.
1122 If you don't know what to do here, say N.
1128 This option enables support for the ARM system coherency unit
1134 This options enables support for the ARM timer and watchdog unit
1137 prompt "Memory split"
1140 Select the desired split between kernel and user memory.
1142 If you are not absolutely sure what you are doing, leave this
1146 bool "3G/1G user/kernel split"
1148 bool "2G/2G user/kernel split"
1150 bool "1G/3G user/kernel split"
1155 default 0x40000000 if VMSPLIT_1G
1156 default 0x80000000 if VMSPLIT_2G
1160 int "Maximum number of CPUs (2-32)"
1166 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1167 depends on SMP && HOTPLUG && EXPERIMENTAL
1169 Say Y here to experiment with turning CPUs off and on. CPUs
1170 can be controlled through /sys/devices/system/cpu.
1173 bool "Use local timer interrupts"
1174 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1175 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
1177 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
1179 Enable support for local timers on SMP platforms, rather then the
1180 legacy IPI broadcast method. Local timers allows the system
1181 accounting to be spread across the timer interval, preventing a
1182 "thundering herd" at every timer tick.
1184 source kernel/Kconfig.preempt
1188 default 128 if ARCH_L7200
1189 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
1190 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1191 default AT91_TIMER_HZ if ARCH_AT91
1194 config THUMB2_KERNEL
1195 bool "Compile the kernel in Thumb-2 mode"
1196 depends on CPU_V7 && EXPERIMENTAL
1198 select ARM_ASM_UNIFIED
1200 By enabling this option, the kernel will be compiled in
1201 Thumb-2 mode. A compiler/assembler that understand the unified
1202 ARM-Thumb syntax is needed.
1206 config ARM_ASM_UNIFIED
1210 bool "Use the ARM EABI to compile the kernel"
1212 This option allows for the kernel to be compiled using the latest
1213 ARM ABI (aka EABI). This is only useful if you are using a user
1214 space environment that is also compiled with EABI.
1216 Since there are major incompatibilities between the legacy ABI and
1217 EABI, especially with regard to structure member alignment, this
1218 option also changes the kernel syscall calling convention to
1219 disambiguate both ABIs and allow for backward compatibility support
1220 (selected with CONFIG_OABI_COMPAT).
1222 To use this you need GCC version 4.0.0 or later.
1225 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1226 depends on AEABI && EXPERIMENTAL
1229 This option preserves the old syscall interface along with the
1230 new (ARM EABI) one. It also provides a compatibility layer to
1231 intercept syscalls that have structure arguments which layout
1232 in memory differs between the legacy ABI and the new ARM EABI
1233 (only for non "thumb" binaries). This option adds a tiny
1234 overhead to all syscalls and produces a slightly larger kernel.
1235 If you know you'll be using only pure EABI user space then you
1236 can say N here. If this option is not selected and you attempt
1237 to execute a legacy ABI binary then the result will be
1238 UNPREDICTABLE (in fact it can be predicted that it won't work
1239 at all). If in doubt say Y.
1241 config ARCH_HAS_HOLES_MEMORYMODEL
1244 # Discontigmem is deprecated
1245 config ARCH_DISCONTIGMEM_ENABLE
1248 config ARCH_SPARSEMEM_ENABLE
1251 config ARCH_SPARSEMEM_DEFAULT
1252 def_bool ARCH_SPARSEMEM_ENABLE
1254 config ARCH_SELECT_MEMORY_MODEL
1255 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1259 default "4" if ARCH_LH7A40X
1261 depends on NEED_MULTIPLE_NODES
1264 bool "High Memory Support (EXPERIMENTAL)"
1265 depends on MMU && EXPERIMENTAL
1267 The address space of ARM processors is only 4 Gigabytes large
1268 and it has to accommodate user address space, kernel address
1269 space as well as some memory mapped IO. That means that, if you
1270 have a large amount of physical memory and/or IO, not all of the
1271 memory can be "permanently mapped" by the kernel. The physical
1272 memory that is not permanently mapped is called "high memory".
1274 Depending on the selected kernel/user memory split, minimum
1275 vmalloc space and actual amount of RAM, you may not need this
1276 option which should result in a slightly faster kernel.
1281 bool "Allocate 2nd-level pagetables from highmem"
1283 depends on !OUTER_CACHE
1285 config HW_PERF_EVENTS
1286 bool "Enable hardware performance counter support for perf events"
1287 depends on PERF_EVENTS && CPU_HAS_PMU
1290 Enable hardware performance counter support for perf events. If
1291 disabled, perf events will use software events only.
1294 bool "Support sparse irq numbering"
1295 depends on EXPERIMENTAL
1297 This enables support for sparse irqs. This is useful in general
1298 as most CPUs have a fairly sparse array of IRQ vectors, which
1299 the irq_desc then maps directly on to. Systems with a high
1300 number of off-chip IRQs will want to treat this as
1301 experimental until they have been independently verified.
1303 If you don't know what to do here, say N.
1308 bool "Timer and CPU usage LEDs"
1309 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1310 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1311 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1312 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1313 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1314 ARCH_AT91 || ARCH_DAVINCI || \
1315 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1317 If you say Y here, the LEDs on your machine will be used
1318 to provide useful information about your current system status.
1320 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1321 be able to select which LEDs are active using the options below. If
1322 you are compiling a kernel for the EBSA-110 or the LART however, the
1323 red LED will simply flash regularly to indicate that the system is
1324 still functional. It is safe to say Y here if you have a CATS
1325 system, but the driver will do nothing.
1328 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1329 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1330 || MACH_OMAP_PERSEUS2
1332 depends on !GENERIC_CLOCKEVENTS
1333 default y if ARCH_EBSA110
1335 If you say Y here, one of the system LEDs (the green one on the
1336 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1337 will flash regularly to indicate that the system is still
1338 operational. This is mainly useful to kernel hackers who are
1339 debugging unstable kernels.
1341 The LART uses the same LED for both Timer LED and CPU usage LED
1342 functions. You may choose to use both, but the Timer LED function
1343 will overrule the CPU usage LED.
1346 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1348 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1349 || MACH_OMAP_PERSEUS2
1352 If you say Y here, the red LED will be used to give a good real
1353 time indication of CPU usage, by lighting whenever the idle task
1354 is not currently executing.
1356 The LART uses the same LED for both Timer LED and CPU usage LED
1357 functions. You may choose to use both, but the Timer LED function
1358 will overrule the CPU usage LED.
1360 config ALIGNMENT_TRAP
1362 depends on CPU_CP15_MMU
1363 default y if !ARCH_EBSA110
1364 select HAVE_PROC_CPU if PROC_FS
1366 ARM processors cannot fetch/store information which is not
1367 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1368 address divisible by 4. On 32-bit ARM processors, these non-aligned
1369 fetch/store instructions will be emulated in software if you say
1370 here, which has a severe performance impact. This is necessary for
1371 correct operation of some network protocols. With an IP-only
1372 configuration it is safe to say N, otherwise say Y.
1374 config UACCESS_WITH_MEMCPY
1375 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1376 depends on MMU && EXPERIMENTAL
1377 default y if CPU_FEROCEON
1379 Implement faster copy_to_user and clear_user methods for CPU
1380 cores where a 8-word STM instruction give significantly higher
1381 memory write throughput than a sequence of individual 32bit stores.
1383 A possible side effect is a slight increase in scheduling latency
1384 between threads sharing the same address space if they invoke
1385 such copy operations with large buffers.
1387 However, if the CPU data cache is using a write-allocate mode,
1388 this option is unlikely to provide any performance gain.
1394 # Compressed boot loader in ROM. Yes, we really want to ask about
1395 # TEXT and BSS so we preserve their values in the config files.
1396 config ZBOOT_ROM_TEXT
1397 hex "Compressed ROM boot loader base address"
1400 The physical address at which the ROM-able zImage is to be
1401 placed in the target. Platforms which normally make use of
1402 ROM-able zImage formats normally set this to a suitable
1403 value in their defconfig file.
1405 If ZBOOT_ROM is not enabled, this has no effect.
1407 config ZBOOT_ROM_BSS
1408 hex "Compressed ROM boot loader BSS address"
1411 The base address of an area of read/write memory in the target
1412 for the ROM-able zImage which must be available while the
1413 decompressor is running. It must be large enough to hold the
1414 entire decompressed kernel plus an additional 128 KiB.
1415 Platforms which normally make use of ROM-able zImage formats
1416 normally set this to a suitable value in their defconfig file.
1418 If ZBOOT_ROM is not enabled, this has no effect.
1421 bool "Compressed boot loader in ROM/flash"
1422 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1424 Say Y here if you intend to execute your compressed kernel image
1425 (zImage) directly from ROM or flash. If unsure, say N.
1428 string "Default kernel command string"
1431 On some architectures (EBSA110 and CATS), there is currently no way
1432 for the boot loader to pass arguments to the kernel. For these
1433 architectures, you should supply some command-line options at build
1434 time by entering them here. As a minimum, you should specify the
1435 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1437 config CMDLINE_FORCE
1438 bool "Always use the default kernel command string"
1439 depends on CMDLINE != ""
1441 Always use the default kernel command string, even if the boot
1442 loader passes other arguments to the kernel.
1443 This is useful if you cannot or don't want to change the
1444 command-line options your boot loader passes to the kernel.
1449 bool "Kernel Execute-In-Place from ROM"
1450 depends on !ZBOOT_ROM
1452 Execute-In-Place allows the kernel to run from non-volatile storage
1453 directly addressable by the CPU, such as NOR flash. This saves RAM
1454 space since the text section of the kernel is not loaded from flash
1455 to RAM. Read-write sections, such as the data section and stack,
1456 are still copied to RAM. The XIP kernel is not compressed since
1457 it has to run directly from flash, so it will take more space to
1458 store it. The flash address used to link the kernel object files,
1459 and for storing it, is configuration dependent. Therefore, if you
1460 say Y here, you must know the proper physical address where to
1461 store the kernel image depending on your own flash memory usage.
1463 Also note that the make target becomes "make xipImage" rather than
1464 "make zImage" or "make Image". The final kernel binary to put in
1465 ROM memory will be arch/arm/boot/xipImage.
1469 config XIP_PHYS_ADDR
1470 hex "XIP Kernel Physical Location"
1471 depends on XIP_KERNEL
1472 default "0x00080000"
1474 This is the physical address in your flash memory the kernel will
1475 be linked for and stored to. This address is dependent on your
1479 bool "Kexec system call (EXPERIMENTAL)"
1480 depends on EXPERIMENTAL
1482 kexec is a system call that implements the ability to shutdown your
1483 current kernel, and to start another kernel. It is like a reboot
1484 but it is independent of the system firmware. And like a reboot
1485 you can start any kernel with it, not just Linux.
1487 It is an ongoing process to be certain the hardware in a machine
1488 is properly shutdown, so do not be surprised if this code does not
1489 initially work for you. It may help to enable device hotplugging
1493 bool "Export atags in procfs"
1497 Should the atags used to boot the kernel be exported in an "atags"
1498 file in procfs. Useful with kexec.
1502 menu "CPU Power Management"
1506 source "drivers/cpufreq/Kconfig"
1508 config CPU_FREQ_SA1100
1511 config CPU_FREQ_SA1110
1514 config CPU_FREQ_INTEGRATOR
1515 tristate "CPUfreq driver for ARM Integrator CPUs"
1516 depends on ARCH_INTEGRATOR && CPU_FREQ
1519 This enables the CPUfreq driver for ARM Integrator CPUs.
1521 For details, take a look at <file:Documentation/cpu-freq>.
1527 depends on CPU_FREQ && ARCH_PXA && PXA25x
1529 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1531 config CPU_FREQ_S3C64XX
1532 bool "CPUfreq support for Samsung S3C64XX CPUs"
1533 depends on CPU_FREQ && CPU_S3C6410
1538 Internal configuration node for common cpufreq on Samsung SoC
1540 config CPU_FREQ_S3C24XX
1541 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1542 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1545 This enables the CPUfreq driver for the Samsung S3C24XX family
1548 For details, take a look at <file:Documentation/cpu-freq>.
1552 config CPU_FREQ_S3C24XX_PLL
1553 bool "Support CPUfreq changing of PLL frequency"
1554 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1556 Compile in support for changing the PLL frequency from the
1557 S3C24XX series CPUfreq driver. The PLL takes time to settle
1558 after a frequency change, so by default it is not enabled.
1560 This also means that the PLL tables for the selected CPU(s) will
1561 be built which may increase the size of the kernel image.
1563 config CPU_FREQ_S3C24XX_DEBUG
1564 bool "Debug CPUfreq Samsung driver core"
1565 depends on CPU_FREQ_S3C24XX
1567 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1569 config CPU_FREQ_S3C24XX_IODEBUG
1570 bool "Debug CPUfreq Samsung driver IO timing"
1571 depends on CPU_FREQ_S3C24XX
1573 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1575 config CPU_FREQ_S3C24XX_DEBUGFS
1576 bool "Export debugfs for CPUFreq"
1577 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1579 Export status information via debugfs.
1583 source "drivers/cpuidle/Kconfig"
1587 menu "Floating point emulation"
1589 comment "At least one emulation must be selected"
1592 bool "NWFPE math emulation"
1593 depends on !AEABI || OABI_COMPAT
1595 Say Y to include the NWFPE floating point emulator in the kernel.
1596 This is necessary to run most binaries. Linux does not currently
1597 support floating point hardware so you need to say Y here even if
1598 your machine has an FPA or floating point co-processor podule.
1600 You may say N here if you are going to load the Acorn FPEmulator
1601 early in the bootup.
1604 bool "Support extended precision"
1605 depends on FPE_NWFPE
1607 Say Y to include 80-bit support in the kernel floating-point
1608 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1609 Note that gcc does not generate 80-bit operations by default,
1610 so in most cases this option only enlarges the size of the
1611 floating point emulator without any good reason.
1613 You almost surely want to say N here.
1616 bool "FastFPE math emulation (EXPERIMENTAL)"
1617 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1619 Say Y here to include the FAST floating point emulator in the kernel.
1620 This is an experimental much faster emulator which now also has full
1621 precision for the mantissa. It does not support any exceptions.
1622 It is very simple, and approximately 3-6 times faster than NWFPE.
1624 It should be sufficient for most programs. It may be not suitable
1625 for scientific calculations, but you have to check this for yourself.
1626 If you do not feel you need a faster FP emulation you should better
1630 bool "VFP-format floating point maths"
1631 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1633 Say Y to include VFP support code in the kernel. This is needed
1634 if your hardware includes a VFP unit.
1636 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1637 release notes and additional status information.
1639 Say N if your target does not have VFP hardware.
1647 bool "Advanced SIMD (NEON) Extension support"
1648 depends on VFPv3 && CPU_V7
1650 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1655 menu "Userspace binary formats"
1657 source "fs/Kconfig.binfmt"
1660 tristate "RISC OS personality"
1663 Say Y here to include the kernel code necessary if you want to run
1664 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1665 experimental; if this sounds frightening, say N and sleep in peace.
1666 You can also say M here to compile this support as a module (which
1667 will be called arthur).
1671 menu "Power management options"
1673 source "kernel/power/Kconfig"
1675 config ARCH_SUSPEND_POSSIBLE
1680 source "net/Kconfig"
1682 source "drivers/Kconfig"
1686 source "arch/arm/Kconfig.debug"
1688 source "security/Kconfig"
1690 source "crypto/Kconfig"
1692 source "lib/Kconfig"