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
276 select ARCH_USES_GETTIMEOFFSET
278 This enables support for systems based on the Atmel AT91RM9200,
279 AT91SAM9 and AT91CAP9 processors.
282 bool "Broadcom BCMRING"
287 select GENERIC_CLOCKEVENTS
288 select ARCH_WANT_OPTIONAL_GPIOLIB
290 Support for Broadcom's BCMRing platform.
293 bool "Cirrus Logic CLPS711x/EP721x-based"
295 select ARCH_USES_GETTIMEOFFSET
297 Support for Cirrus Logic 711x/721x based boards.
300 bool "Cavium Networks CNS3XXX family"
302 select GENERIC_CLOCKEVENTS
305 Support for Cavium Networks CNS3XXX platform.
308 bool "Cortina Systems Gemini"
310 select ARCH_REQUIRE_GPIOLIB
311 select ARCH_USES_GETTIMEOFFSET
313 Support for the Cortina Systems Gemini family SoCs
320 select ARCH_USES_GETTIMEOFFSET
322 This is an evaluation board for the StrongARM processor available
323 from Digital. It has limited hardware on-board, including an
324 Ethernet interface, two PCMCIA sockets, two serial ports and a
333 select ARCH_REQUIRE_GPIOLIB
334 select ARCH_HAS_HOLES_MEMORYMODEL
335 select ARCH_USES_GETTIMEOFFSET
337 This enables support for the Cirrus EP93xx series of CPUs.
339 config ARCH_FOOTBRIDGE
343 select ARCH_USES_GETTIMEOFFSET
345 Support for systems based on the DC21285 companion chip
346 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
349 bool "Freescale MXC/iMX-based"
350 select GENERIC_CLOCKEVENTS
351 select ARCH_REQUIRE_GPIOLIB
354 Support for Freescale MXC/iMX-based family of processors
357 bool "Freescale STMP3xxx"
360 select ARCH_REQUIRE_GPIOLIB
361 select GENERIC_CLOCKEVENTS
362 select USB_ARCH_HAS_EHCI
364 Support for systems based on the Freescale 3xxx CPUs.
367 bool "Hilscher NetX based"
370 select GENERIC_CLOCKEVENTS
372 This enables support for systems based on the Hilscher NetX Soc
375 bool "Hynix HMS720x-based"
378 select ARCH_USES_GETTIMEOFFSET
380 This enables support for systems based on the Hynix HMS720x
388 select ARCH_SUPPORTS_MSI
391 Support for Intel's IOP13XX (XScale) family of processors.
399 select ARCH_REQUIRE_GPIOLIB
401 Support for Intel's 80219 and IOP32X (XScale) family of
410 select ARCH_REQUIRE_GPIOLIB
412 Support for Intel's IOP33X (XScale) family of processors.
419 select ARCH_USES_GETTIMEOFFSET
421 Support for Intel's IXP23xx (XScale) family of processors.
424 bool "IXP2400/2800-based"
428 select ARCH_USES_GETTIMEOFFSET
430 Support for Intel's IXP2400/2800 (XScale) family of processors.
437 select GENERIC_CLOCKEVENTS
438 select DMABOUNCE if PCI
440 Support for Intel's IXP4XX (XScale) family of processors.
446 select ARCH_USES_GETTIMEOFFSET
448 Say Y here if you intend to run this kernel on a LinkUp Systems
449 L7200 Software Development Board which uses an ARM720T processor.
450 Information on this board can be obtained at:
452 <http://www.linkupsys.com/>
454 If you have any questions or comments about the Linux kernel port
455 to this board, send e-mail to <sjhill@cotw.com>.
460 select ARCH_REQUIRE_GPIOLIB
461 select GENERIC_CLOCKEVENTS
464 Support for the Marvell Dove SoC 88AP510
467 bool "Marvell Kirkwood"
470 select ARCH_REQUIRE_GPIOLIB
471 select GENERIC_CLOCKEVENTS
474 Support for the following Marvell Kirkwood series SoCs:
475 88F6180, 88F6192 and 88F6281.
478 bool "Marvell Loki (88RC8480)"
480 select GENERIC_CLOCKEVENTS
483 Support for the Marvell Loki (88RC8480) SoC.
486 bool "Marvell MV78xx0"
489 select ARCH_REQUIRE_GPIOLIB
490 select GENERIC_CLOCKEVENTS
493 Support for the following Marvell MV78xx0 series SoCs:
501 select ARCH_REQUIRE_GPIOLIB
502 select GENERIC_CLOCKEVENTS
505 Support for the following Marvell Orion 5x series SoCs:
506 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
507 Orion-2 (5281), Orion-1-90 (6183).
510 bool "Marvell PXA168/910/MMP2"
512 select ARCH_REQUIRE_GPIOLIB
514 select GENERIC_CLOCKEVENTS
518 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
521 bool "Micrel/Kendin KS8695"
523 select ARCH_REQUIRE_GPIOLIB
524 select ARCH_USES_GETTIMEOFFSET
526 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
527 System-on-Chip devices.
530 bool "NetSilicon NS9xxx"
533 select GENERIC_CLOCKEVENTS
536 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
539 <http://www.digi.com/products/microprocessors/index.jsp>
542 bool "Nuvoton W90X900 CPU"
544 select ARCH_REQUIRE_GPIOLIB
546 select GENERIC_CLOCKEVENTS
548 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
549 At present, the w90x900 has been renamed nuc900, regarding
550 the ARM series product line, you can login the following
551 link address to know more.
553 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
554 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
557 bool "Nuvoton NUC93X CPU"
561 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
562 low-power and high performance MPEG-4/JPEG multimedia controller chip.
565 bool "Philips Nexperia PNX4008 Mobile"
568 select ARCH_USES_GETTIMEOFFSET
570 This enables support for Philips PNX4008 mobile platform.
573 bool "PXA2xx/PXA3xx-based"
576 select ARCH_HAS_CPUFREQ
578 select ARCH_REQUIRE_GPIOLIB
579 select GENERIC_CLOCKEVENTS
583 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
588 select GENERIC_CLOCKEVENTS
590 Support for Qualcomm MSM/QSD based systems. This runs on the
591 apps processor of the MSM/QSD and depends on a shared memory
592 interface to the modem processor which runs the baseband
593 stack and controls some vital subsystems
594 (clock and power control, etc).
597 bool "Renesas SH-Mobile"
599 Support for Renesas's SH-Mobile ARM platforms
606 select ARCH_MAY_HAVE_PC_FDC
607 select HAVE_PATA_PLATFORM
610 select ARCH_SPARSEMEM_ENABLE
611 select ARCH_USES_GETTIMEOFFSET
613 On the Acorn Risc-PC, Linux can support the internal IDE disk and
614 CD-ROM interface, serial and parallel port, and the floppy drive.
620 select ARCH_SPARSEMEM_ENABLE
622 select ARCH_HAS_CPUFREQ
624 select GENERIC_CLOCKEVENTS
627 select ARCH_REQUIRE_GPIOLIB
629 Support for StrongARM 11x0 based boards.
632 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
634 select ARCH_HAS_CPUFREQ
636 select ARCH_USES_GETTIMEOFFSET
638 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
639 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
640 the Samsung SMDK2410 development board (and derivatives).
642 Note, the S3C2416 and the S3C2450 are so close that they even share
643 the same SoC ID code. This means that there is no seperate machine
644 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
647 bool "Samsung S3C64XX"
653 select ARCH_USES_GETTIMEOFFSET
654 select ARCH_HAS_CPUFREQ
655 select ARCH_REQUIRE_GPIOLIB
656 select SAMSUNG_CLKSRC
657 select SAMSUNG_IRQ_VIC_TIMER
658 select SAMSUNG_IRQ_UART
659 select S3C_GPIO_TRACK
660 select S3C_GPIO_PULL_UPDOWN
661 select S3C_GPIO_CFG_S3C24XX
662 select S3C_GPIO_CFG_S3C64XX
664 select USB_ARCH_HAS_OHCI
665 select SAMSUNG_GPIOLIB_4BIT
667 Samsung S3C64XX series based systems
670 bool "Samsung S5P6440"
674 select ARCH_USES_GETTIMEOFFSET
676 Samsung S5P6440 CPU based systems
679 bool "Samsung S5P6442"
683 select ARCH_USES_GETTIMEOFFSET
685 Samsung S5P6442 CPU based systems
688 bool "Samsung S5PC100"
692 select ARM_L1_CACHE_SHIFT_6
693 select ARCH_USES_GETTIMEOFFSET
695 Samsung S5PC100 series based systems
698 bool "Samsung S5PV210/S5PC110"
702 select ARM_L1_CACHE_SHIFT_6
703 select ARCH_USES_GETTIMEOFFSET
705 Samsung S5PV210/S5PC110 series based systems
714 select ARCH_USES_GETTIMEOFFSET
716 Support for the StrongARM based Digital DNARD machine, also known
717 as "Shark" (<http://www.shark-linux.de/shark.html>).
722 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
723 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
724 select ARCH_USES_GETTIMEOFFSET
726 Say Y here for systems based on one of the Sharp LH7A40X
727 System on a Chip processors. These CPUs include an ARM922T
728 core with a wide array of integrated devices for
729 hand-held and low-power applications.
732 bool "ST-Ericsson U300 Series"
738 select GENERIC_CLOCKEVENTS
742 Support for ST-Ericsson U300 series mobile platforms.
745 bool "ST-Ericsson U8500 Series"
748 select GENERIC_CLOCKEVENTS
750 select ARCH_REQUIRE_GPIOLIB
752 Support for ST-Ericsson's Ux500 architecture
755 bool "STMicroelectronics Nomadik"
760 select GENERIC_CLOCKEVENTS
761 select ARCH_REQUIRE_GPIOLIB
763 Support for the Nomadik platform by ST-Ericsson
767 select GENERIC_CLOCKEVENTS
768 select ARCH_REQUIRE_GPIOLIB
772 select GENERIC_ALLOCATOR
773 select ARCH_HAS_HOLES_MEMORYMODEL
775 Support for TI's DaVinci platform.
780 select ARCH_REQUIRE_GPIOLIB
781 select ARCH_HAS_CPUFREQ
782 select GENERIC_CLOCKEVENTS
783 select ARCH_HAS_HOLES_MEMORYMODEL
785 Support for TI's OMAP platform (OMAP1 and OMAP2).
790 select ARCH_REQUIRE_GPIOLIB
792 select GENERIC_CLOCKEVENTS
795 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
800 # This is sorted alphabetically by mach-* pathname. However, plat-*
801 # Kconfigs may be included either alphabetically (according to the
802 # plat- suffix) or along side the corresponding mach-* source.
804 source "arch/arm/mach-aaec2000/Kconfig"
806 source "arch/arm/mach-at91/Kconfig"
808 source "arch/arm/mach-bcmring/Kconfig"
810 source "arch/arm/mach-clps711x/Kconfig"
812 source "arch/arm/mach-cns3xxx/Kconfig"
814 source "arch/arm/mach-davinci/Kconfig"
816 source "arch/arm/mach-dove/Kconfig"
818 source "arch/arm/mach-ep93xx/Kconfig"
820 source "arch/arm/mach-footbridge/Kconfig"
822 source "arch/arm/mach-gemini/Kconfig"
824 source "arch/arm/mach-h720x/Kconfig"
826 source "arch/arm/mach-integrator/Kconfig"
828 source "arch/arm/mach-iop32x/Kconfig"
830 source "arch/arm/mach-iop33x/Kconfig"
832 source "arch/arm/mach-iop13xx/Kconfig"
834 source "arch/arm/mach-ixp4xx/Kconfig"
836 source "arch/arm/mach-ixp2000/Kconfig"
838 source "arch/arm/mach-ixp23xx/Kconfig"
840 source "arch/arm/mach-kirkwood/Kconfig"
842 source "arch/arm/mach-ks8695/Kconfig"
844 source "arch/arm/mach-lh7a40x/Kconfig"
846 source "arch/arm/mach-loki/Kconfig"
848 source "arch/arm/mach-msm/Kconfig"
850 source "arch/arm/mach-mv78xx0/Kconfig"
852 source "arch/arm/plat-mxc/Kconfig"
854 source "arch/arm/mach-netx/Kconfig"
856 source "arch/arm/mach-nomadik/Kconfig"
857 source "arch/arm/plat-nomadik/Kconfig"
859 source "arch/arm/mach-ns9xxx/Kconfig"
861 source "arch/arm/mach-nuc93x/Kconfig"
863 source "arch/arm/plat-omap/Kconfig"
865 source "arch/arm/mach-omap1/Kconfig"
867 source "arch/arm/mach-omap2/Kconfig"
869 source "arch/arm/mach-orion5x/Kconfig"
871 source "arch/arm/mach-pxa/Kconfig"
872 source "arch/arm/plat-pxa/Kconfig"
874 source "arch/arm/mach-mmp/Kconfig"
876 source "arch/arm/mach-realview/Kconfig"
878 source "arch/arm/mach-sa1100/Kconfig"
880 source "arch/arm/plat-samsung/Kconfig"
881 source "arch/arm/plat-s3c24xx/Kconfig"
882 source "arch/arm/plat-s5p/Kconfig"
884 source "arch/arm/plat-spear/Kconfig"
887 source "arch/arm/mach-s3c2400/Kconfig"
888 source "arch/arm/mach-s3c2410/Kconfig"
889 source "arch/arm/mach-s3c2412/Kconfig"
890 source "arch/arm/mach-s3c2416/Kconfig"
891 source "arch/arm/mach-s3c2440/Kconfig"
892 source "arch/arm/mach-s3c2443/Kconfig"
896 source "arch/arm/mach-s3c64xx/Kconfig"
899 source "arch/arm/mach-s5p6440/Kconfig"
901 source "arch/arm/mach-s5p6442/Kconfig"
903 source "arch/arm/mach-s5pc100/Kconfig"
905 source "arch/arm/mach-s5pv210/Kconfig"
907 source "arch/arm/mach-shmobile/Kconfig"
909 source "arch/arm/plat-stmp3xxx/Kconfig"
911 source "arch/arm/mach-u300/Kconfig"
913 source "arch/arm/mach-ux500/Kconfig"
915 source "arch/arm/mach-versatile/Kconfig"
917 source "arch/arm/mach-vexpress/Kconfig"
919 source "arch/arm/mach-w90x900/Kconfig"
921 # Definitions to make life easier
927 select GENERIC_CLOCKEVENTS
935 config PLAT_VERSATILE
938 config ARM_TIMER_SP804
941 source arch/arm/mm/Kconfig
944 bool "Enable iWMMXt support"
945 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
946 default y if PXA27x || PXA3xx || ARCH_MMP
948 Enable support for iWMMXt context switching at run time if
949 running on a CPU that supports it.
951 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
954 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
958 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
959 (!ARCH_OMAP3 || OMAP3_EMU)
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.
1296 bool "Timer and CPU usage LEDs"
1297 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1298 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1299 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1300 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1301 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1302 ARCH_AT91 || ARCH_DAVINCI || \
1303 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1305 If you say Y here, the LEDs on your machine will be used
1306 to provide useful information about your current system status.
1308 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1309 be able to select which LEDs are active using the options below. If
1310 you are compiling a kernel for the EBSA-110 or the LART however, the
1311 red LED will simply flash regularly to indicate that the system is
1312 still functional. It is safe to say Y here if you have a CATS
1313 system, but the driver will do nothing.
1316 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1317 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1318 || MACH_OMAP_PERSEUS2
1320 depends on !GENERIC_CLOCKEVENTS
1321 default y if ARCH_EBSA110
1323 If you say Y here, one of the system LEDs (the green one on the
1324 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1325 will flash regularly to indicate that the system is still
1326 operational. This is mainly useful to kernel hackers who are
1327 debugging unstable kernels.
1329 The LART uses the same LED for both Timer LED and CPU usage LED
1330 functions. You may choose to use both, but the Timer LED function
1331 will overrule the CPU usage LED.
1334 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1336 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1337 || MACH_OMAP_PERSEUS2
1340 If you say Y here, the red LED will be used to give a good real
1341 time indication of CPU usage, by lighting whenever the idle task
1342 is not currently executing.
1344 The LART uses the same LED for both Timer LED and CPU usage LED
1345 functions. You may choose to use both, but the Timer LED function
1346 will overrule the CPU usage LED.
1348 config ALIGNMENT_TRAP
1350 depends on CPU_CP15_MMU
1351 default y if !ARCH_EBSA110
1352 select HAVE_PROC_CPU if PROC_FS
1354 ARM processors cannot fetch/store information which is not
1355 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1356 address divisible by 4. On 32-bit ARM processors, these non-aligned
1357 fetch/store instructions will be emulated in software if you say
1358 here, which has a severe performance impact. This is necessary for
1359 correct operation of some network protocols. With an IP-only
1360 configuration it is safe to say N, otherwise say Y.
1362 config UACCESS_WITH_MEMCPY
1363 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1364 depends on MMU && EXPERIMENTAL
1365 default y if CPU_FEROCEON
1367 Implement faster copy_to_user and clear_user methods for CPU
1368 cores where a 8-word STM instruction give significantly higher
1369 memory write throughput than a sequence of individual 32bit stores.
1371 A possible side effect is a slight increase in scheduling latency
1372 between threads sharing the same address space if they invoke
1373 such copy operations with large buffers.
1375 However, if the CPU data cache is using a write-allocate mode,
1376 this option is unlikely to provide any performance gain.
1382 # Compressed boot loader in ROM. Yes, we really want to ask about
1383 # TEXT and BSS so we preserve their values in the config files.
1384 config ZBOOT_ROM_TEXT
1385 hex "Compressed ROM boot loader base address"
1388 The physical address at which the ROM-able zImage is to be
1389 placed in the target. Platforms which normally make use of
1390 ROM-able zImage formats normally set this to a suitable
1391 value in their defconfig file.
1393 If ZBOOT_ROM is not enabled, this has no effect.
1395 config ZBOOT_ROM_BSS
1396 hex "Compressed ROM boot loader BSS address"
1399 The base address of an area of read/write memory in the target
1400 for the ROM-able zImage which must be available while the
1401 decompressor is running. It must be large enough to hold the
1402 entire decompressed kernel plus an additional 128 KiB.
1403 Platforms which normally make use of ROM-able zImage formats
1404 normally set this to a suitable value in their defconfig file.
1406 If ZBOOT_ROM is not enabled, this has no effect.
1409 bool "Compressed boot loader in ROM/flash"
1410 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1412 Say Y here if you intend to execute your compressed kernel image
1413 (zImage) directly from ROM or flash. If unsure, say N.
1416 string "Default kernel command string"
1419 On some architectures (EBSA110 and CATS), there is currently no way
1420 for the boot loader to pass arguments to the kernel. For these
1421 architectures, you should supply some command-line options at build
1422 time by entering them here. As a minimum, you should specify the
1423 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1425 config CMDLINE_FORCE
1426 bool "Always use the default kernel command string"
1427 depends on CMDLINE != ""
1429 Always use the default kernel command string, even if the boot
1430 loader passes other arguments to the kernel.
1431 This is useful if you cannot or don't want to change the
1432 command-line options your boot loader passes to the kernel.
1437 bool "Kernel Execute-In-Place from ROM"
1438 depends on !ZBOOT_ROM
1440 Execute-In-Place allows the kernel to run from non-volatile storage
1441 directly addressable by the CPU, such as NOR flash. This saves RAM
1442 space since the text section of the kernel is not loaded from flash
1443 to RAM. Read-write sections, such as the data section and stack,
1444 are still copied to RAM. The XIP kernel is not compressed since
1445 it has to run directly from flash, so it will take more space to
1446 store it. The flash address used to link the kernel object files,
1447 and for storing it, is configuration dependent. Therefore, if you
1448 say Y here, you must know the proper physical address where to
1449 store the kernel image depending on your own flash memory usage.
1451 Also note that the make target becomes "make xipImage" rather than
1452 "make zImage" or "make Image". The final kernel binary to put in
1453 ROM memory will be arch/arm/boot/xipImage.
1457 config XIP_PHYS_ADDR
1458 hex "XIP Kernel Physical Location"
1459 depends on XIP_KERNEL
1460 default "0x00080000"
1462 This is the physical address in your flash memory the kernel will
1463 be linked for and stored to. This address is dependent on your
1467 bool "Kexec system call (EXPERIMENTAL)"
1468 depends on EXPERIMENTAL
1470 kexec is a system call that implements the ability to shutdown your
1471 current kernel, and to start another kernel. It is like a reboot
1472 but it is independent of the system firmware. And like a reboot
1473 you can start any kernel with it, not just Linux.
1475 It is an ongoing process to be certain the hardware in a machine
1476 is properly shutdown, so do not be surprised if this code does not
1477 initially work for you. It may help to enable device hotplugging
1481 bool "Export atags in procfs"
1485 Should the atags used to boot the kernel be exported in an "atags"
1486 file in procfs. Useful with kexec.
1490 menu "CPU Power Management"
1494 source "drivers/cpufreq/Kconfig"
1496 config CPU_FREQ_SA1100
1499 config CPU_FREQ_SA1110
1502 config CPU_FREQ_INTEGRATOR
1503 tristate "CPUfreq driver for ARM Integrator CPUs"
1504 depends on ARCH_INTEGRATOR && CPU_FREQ
1507 This enables the CPUfreq driver for ARM Integrator CPUs.
1509 For details, take a look at <file:Documentation/cpu-freq>.
1515 depends on CPU_FREQ && ARCH_PXA && PXA25x
1517 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1519 config CPU_FREQ_S3C64XX
1520 bool "CPUfreq support for Samsung S3C64XX CPUs"
1521 depends on CPU_FREQ && CPU_S3C6410
1526 Internal configuration node for common cpufreq on Samsung SoC
1528 config CPU_FREQ_S3C24XX
1529 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1530 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1533 This enables the CPUfreq driver for the Samsung S3C24XX family
1536 For details, take a look at <file:Documentation/cpu-freq>.
1540 config CPU_FREQ_S3C24XX_PLL
1541 bool "Support CPUfreq changing of PLL frequency"
1542 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1544 Compile in support for changing the PLL frequency from the
1545 S3C24XX series CPUfreq driver. The PLL takes time to settle
1546 after a frequency change, so by default it is not enabled.
1548 This also means that the PLL tables for the selected CPU(s) will
1549 be built which may increase the size of the kernel image.
1551 config CPU_FREQ_S3C24XX_DEBUG
1552 bool "Debug CPUfreq Samsung driver core"
1553 depends on CPU_FREQ_S3C24XX
1555 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1557 config CPU_FREQ_S3C24XX_IODEBUG
1558 bool "Debug CPUfreq Samsung driver IO timing"
1559 depends on CPU_FREQ_S3C24XX
1561 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1563 config CPU_FREQ_S3C24XX_DEBUGFS
1564 bool "Export debugfs for CPUFreq"
1565 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1567 Export status information via debugfs.
1571 source "drivers/cpuidle/Kconfig"
1575 menu "Floating point emulation"
1577 comment "At least one emulation must be selected"
1580 bool "NWFPE math emulation"
1581 depends on !AEABI || OABI_COMPAT
1583 Say Y to include the NWFPE floating point emulator in the kernel.
1584 This is necessary to run most binaries. Linux does not currently
1585 support floating point hardware so you need to say Y here even if
1586 your machine has an FPA or floating point co-processor podule.
1588 You may say N here if you are going to load the Acorn FPEmulator
1589 early in the bootup.
1592 bool "Support extended precision"
1593 depends on FPE_NWFPE
1595 Say Y to include 80-bit support in the kernel floating-point
1596 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1597 Note that gcc does not generate 80-bit operations by default,
1598 so in most cases this option only enlarges the size of the
1599 floating point emulator without any good reason.
1601 You almost surely want to say N here.
1604 bool "FastFPE math emulation (EXPERIMENTAL)"
1605 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1607 Say Y here to include the FAST floating point emulator in the kernel.
1608 This is an experimental much faster emulator which now also has full
1609 precision for the mantissa. It does not support any exceptions.
1610 It is very simple, and approximately 3-6 times faster than NWFPE.
1612 It should be sufficient for most programs. It may be not suitable
1613 for scientific calculations, but you have to check this for yourself.
1614 If you do not feel you need a faster FP emulation you should better
1618 bool "VFP-format floating point maths"
1619 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1621 Say Y to include VFP support code in the kernel. This is needed
1622 if your hardware includes a VFP unit.
1624 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1625 release notes and additional status information.
1627 Say N if your target does not have VFP hardware.
1635 bool "Advanced SIMD (NEON) Extension support"
1636 depends on VFPv3 && CPU_V7
1638 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1643 menu "Userspace binary formats"
1645 source "fs/Kconfig.binfmt"
1648 tristate "RISC OS personality"
1651 Say Y here to include the kernel code necessary if you want to run
1652 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1653 experimental; if this sounds frightening, say N and sleep in peace.
1654 You can also say M here to compile this support as a module (which
1655 will be called arthur).
1659 menu "Power management options"
1661 source "kernel/power/Kconfig"
1663 config ARCH_SUSPEND_POSSIBLE
1668 source "net/Kconfig"
1670 source "drivers/Kconfig"
1674 source "arch/arm/Kconfig.debug"
1676 source "security/Kconfig"
1678 source "crypto/Kconfig"
1680 source "lib/Kconfig"