8 select SYS_SUPPORTS_APM_EMULATION
9 select GENERIC_ATOMIC64 if (!CPU_32v6K || !AEABI)
10 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
12 select HAVE_KPROBES if (!XIP_KERNEL)
13 select HAVE_KRETPROBES if (HAVE_KPROBES)
14 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
15 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
16 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
17 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
18 select HAVE_GENERIC_DMA_COHERENT
19 select HAVE_KERNEL_GZIP
20 select HAVE_KERNEL_LZO
21 select HAVE_KERNEL_LZMA
23 select HAVE_PERF_EVENTS
24 select PERF_USE_VMALLOC
25 select HAVE_REGS_AND_STACK_ACCESS_API
26 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V7))
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
41 config HAVE_SCHED_CLOCK
47 config ARCH_USES_GETTIMEOFFSET
51 config GENERIC_CLOCKEVENTS
54 config GENERIC_CLOCKEVENTS_BROADCAST
56 depends on GENERIC_CLOCKEVENTS
61 select GENERIC_ALLOCATOR
72 The Extended Industry Standard Architecture (EISA) bus was
73 developed as an open alternative to the IBM MicroChannel bus.
75 The EISA bus provided some of the features of the IBM MicroChannel
76 bus while maintaining backward compatibility with cards made for
77 the older ISA bus. The EISA bus saw limited use between 1988 and
78 1995 when it was made obsolete by the PCI bus.
80 Say Y here if you are building a kernel for an EISA-based machine.
90 MicroChannel Architecture is found in some IBM PS/2 machines and
91 laptops. It is a bus system similar to PCI or ISA. See
92 <file:Documentation/mca.txt> (and especially the web page given
93 there) before attempting to build an MCA bus kernel.
95 config GENERIC_HARDIRQS
99 config STACKTRACE_SUPPORT
103 config HAVE_LATENCYTOP_SUPPORT
108 config LOCKDEP_SUPPORT
112 config TRACE_IRQFLAGS_SUPPORT
116 config HARDIRQS_SW_RESEND
120 config GENERIC_IRQ_PROBE
124 config GENERIC_LOCKBREAK
127 depends on SMP && PREEMPT
129 config RWSEM_GENERIC_SPINLOCK
133 config RWSEM_XCHGADD_ALGORITHM
136 config ARCH_HAS_ILOG2_U32
139 config ARCH_HAS_ILOG2_U64
142 config ARCH_HAS_CPUFREQ
145 Internal node to signify that the ARCH has CPUFREQ support
146 and that the relevant menu configurations are displayed for
149 config ARCH_HAS_CPU_IDLE_WAIT
152 config GENERIC_HWEIGHT
156 config GENERIC_CALIBRATE_DELAY
160 config ARCH_MAY_HAVE_PC_FDC
166 config NEED_DMA_MAP_STATE
169 config GENERIC_ISA_DMA
178 config GENERIC_HARDIRQS_NO__DO_IRQ
181 config ARM_L1_CACHE_SHIFT_6
184 Setting ARM L1 cache line size to 64 Bytes.
188 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
189 default DRAM_BASE if REMAP_VECTORS_TO_RAM
192 The base address of exception vectors.
194 source "init/Kconfig"
196 source "kernel/Kconfig.freezer"
201 bool "MMU-based Paged Memory Management Support"
204 Select if you want MMU-based virtualised addressing space
205 support by paged memory management. If unsure, say 'Y'.
208 # The "ARM system type" choice list is ordered alphabetically by option
209 # text. Please add new entries in the option alphabetic order.
212 prompt "ARM system type"
213 default ARCH_VERSATILE
216 bool "Agilent AAEC-2000 based"
220 select ARCH_USES_GETTIMEOFFSET
222 This enables support for systems based on the Agilent AAEC-2000
224 config ARCH_INTEGRATOR
225 bool "ARM Ltd. Integrator family"
227 select ARCH_HAS_CPUFREQ
230 select GENERIC_CLOCKEVENTS
231 select PLAT_VERSATILE
233 Support for ARM's Integrator platform.
236 bool "ARM Ltd. RealView family"
240 select GENERIC_CLOCKEVENTS
241 select ARCH_WANT_OPTIONAL_GPIOLIB
242 select PLAT_VERSATILE
243 select ARM_TIMER_SP804
244 select GPIO_PL061 if GPIOLIB
246 This enables support for ARM Ltd RealView boards.
248 config ARCH_VERSATILE
249 bool "ARM Ltd. Versatile family"
254 select GENERIC_CLOCKEVENTS
255 select ARCH_WANT_OPTIONAL_GPIOLIB
256 select PLAT_VERSATILE
257 select ARM_TIMER_SP804
259 This enables support for ARM Ltd Versatile board.
262 bool "ARM Ltd. Versatile Express family"
263 select ARCH_WANT_OPTIONAL_GPIOLIB
265 select ARM_TIMER_SP804
267 select GENERIC_CLOCKEVENTS
270 select PLAT_VERSATILE
272 This enables support for the ARM Ltd Versatile Express boards.
276 select ARCH_REQUIRE_GPIOLIB
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
305 select PCI_DOMAINS if PCI
307 Support for Cavium Networks CNS3XXX platform.
310 bool "Cortina Systems Gemini"
312 select ARCH_REQUIRE_GPIOLIB
313 select ARCH_USES_GETTIMEOFFSET
315 Support for the Cortina Systems Gemini family SoCs
322 select ARCH_USES_GETTIMEOFFSET
324 This is an evaluation board for the StrongARM processor available
325 from Digital. It has limited hardware on-board, including an
326 Ethernet interface, two PCMCIA sockets, two serial ports and a
335 select ARCH_REQUIRE_GPIOLIB
336 select ARCH_HAS_HOLES_MEMORYMODEL
337 select ARCH_USES_GETTIMEOFFSET
339 This enables support for the Cirrus EP93xx series of CPUs.
341 config ARCH_FOOTBRIDGE
345 select ARCH_USES_GETTIMEOFFSET
347 Support for systems based on the DC21285 companion chip
348 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
351 bool "Freescale MXC/iMX-based"
352 select GENERIC_CLOCKEVENTS
353 select ARCH_REQUIRE_GPIOLIB
356 Support for Freescale MXC/iMX-based family of processors
359 bool "Freescale STMP3xxx"
362 select ARCH_REQUIRE_GPIOLIB
363 select GENERIC_CLOCKEVENTS
364 select USB_ARCH_HAS_EHCI
366 Support for systems based on the Freescale 3xxx CPUs.
369 bool "Hilscher NetX based"
372 select GENERIC_CLOCKEVENTS
374 This enables support for systems based on the Hilscher NetX Soc
377 bool "Hynix HMS720x-based"
380 select ARCH_USES_GETTIMEOFFSET
382 This enables support for systems based on the Hynix HMS720x
390 select ARCH_SUPPORTS_MSI
393 Support for Intel's IOP13XX (XScale) family of processors.
401 select ARCH_REQUIRE_GPIOLIB
403 Support for Intel's 80219 and IOP32X (XScale) family of
412 select ARCH_REQUIRE_GPIOLIB
414 Support for Intel's IOP33X (XScale) family of processors.
421 select ARCH_USES_GETTIMEOFFSET
423 Support for Intel's IXP23xx (XScale) family of processors.
426 bool "IXP2400/2800-based"
430 select ARCH_USES_GETTIMEOFFSET
432 Support for Intel's IXP2400/2800 (XScale) family of processors.
439 select GENERIC_CLOCKEVENTS
440 select HAVE_SCHED_CLOCK
441 select DMABOUNCE if PCI
443 Support for Intel's IXP4XX (XScale) family of processors.
448 select ARCH_REQUIRE_GPIOLIB
449 select GENERIC_CLOCKEVENTS
452 Support for the Marvell Dove SoC 88AP510
455 bool "Marvell Kirkwood"
458 select ARCH_REQUIRE_GPIOLIB
459 select GENERIC_CLOCKEVENTS
462 Support for the following Marvell Kirkwood series SoCs:
463 88F6180, 88F6192 and 88F6281.
466 bool "Marvell Loki (88RC8480)"
468 select GENERIC_CLOCKEVENTS
471 Support for the Marvell Loki (88RC8480) SoC.
476 select ARCH_REQUIRE_GPIOLIB
479 select USB_ARCH_HAS_OHCI
482 select GENERIC_CLOCKEVENTS
484 Support for the NXP LPC32XX family of processors
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
516 select HAVE_SCHED_CLOCK
521 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
524 bool "Micrel/Kendin KS8695"
526 select ARCH_REQUIRE_GPIOLIB
527 select ARCH_USES_GETTIMEOFFSET
529 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
530 System-on-Chip devices.
533 bool "NetSilicon NS9xxx"
536 select GENERIC_CLOCKEVENTS
539 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
542 <http://www.digi.com/products/microprocessors/index.jsp>
545 bool "Nuvoton W90X900 CPU"
547 select ARCH_REQUIRE_GPIOLIB
549 select GENERIC_CLOCKEVENTS
551 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
552 At present, the w90x900 has been renamed nuc900, regarding
553 the ARM series product line, you can login the following
554 link address to know more.
556 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
557 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
560 bool "Nuvoton NUC93X CPU"
564 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
565 low-power and high performance MPEG-4/JPEG multimedia controller chip.
570 select GENERIC_CLOCKEVENTS
573 select HAVE_SCHED_CLOCK
575 select ARCH_HAS_BARRIERS if CACHE_L2X0
576 select ARCH_HAS_CPUFREQ
578 This enables support for NVIDIA Tegra based systems (Tegra APX,
579 Tegra 6xx and Tegra 2 series).
582 bool "Philips Nexperia PNX4008 Mobile"
585 select ARCH_USES_GETTIMEOFFSET
587 This enables support for Philips PNX4008 mobile platform.
590 bool "PXA2xx/PXA3xx-based"
593 select ARCH_HAS_CPUFREQ
595 select ARCH_REQUIRE_GPIOLIB
596 select GENERIC_CLOCKEVENTS
597 select HAVE_SCHED_CLOCK
602 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
607 select GENERIC_CLOCKEVENTS
608 select ARCH_REQUIRE_GPIOLIB
610 Support for Qualcomm MSM/QSD based systems. This runs on the
611 apps processor of the MSM/QSD and depends on a shared memory
612 interface to the modem processor which runs the baseband
613 stack and controls some vital subsystems
614 (clock and power control, etc).
617 bool "Renesas SH-Mobile"
619 Support for Renesas's SH-Mobile ARM platforms
626 select ARCH_MAY_HAVE_PC_FDC
627 select HAVE_PATA_PLATFORM
630 select ARCH_SPARSEMEM_ENABLE
631 select ARCH_USES_GETTIMEOFFSET
633 On the Acorn Risc-PC, Linux can support the internal IDE disk and
634 CD-ROM interface, serial and parallel port, and the floppy drive.
640 select ARCH_SPARSEMEM_ENABLE
642 select ARCH_HAS_CPUFREQ
644 select GENERIC_CLOCKEVENTS
646 select HAVE_SCHED_CLOCK
648 select ARCH_REQUIRE_GPIOLIB
650 Support for StrongARM 11x0 based boards.
653 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
655 select ARCH_HAS_CPUFREQ
657 select ARCH_USES_GETTIMEOFFSET
658 select HAVE_S3C2410_I2C if I2C
660 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
661 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
662 the Samsung SMDK2410 development board (and derivatives).
664 Note, the S3C2416 and the S3C2450 are so close that they even share
665 the same SoC ID code. This means that there is no seperate machine
666 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
669 bool "Samsung S3C64XX"
675 select ARCH_USES_GETTIMEOFFSET
676 select ARCH_HAS_CPUFREQ
677 select ARCH_REQUIRE_GPIOLIB
678 select SAMSUNG_CLKSRC
679 select SAMSUNG_IRQ_VIC_TIMER
680 select SAMSUNG_IRQ_UART
681 select S3C_GPIO_TRACK
682 select S3C_GPIO_PULL_UPDOWN
683 select S3C_GPIO_CFG_S3C24XX
684 select S3C_GPIO_CFG_S3C64XX
686 select USB_ARCH_HAS_OHCI
687 select SAMSUNG_GPIOLIB_4BIT
688 select HAVE_S3C2410_I2C if I2C
689 select HAVE_S3C2410_WATCHDOG if WATCHDOG
691 Samsung S3C64XX series based systems
694 bool "Samsung S5P6440 S5P6450"
698 select HAVE_S3C2410_WATCHDOG if WATCHDOG
699 select ARCH_USES_GETTIMEOFFSET
700 select HAVE_S3C2410_I2C if I2C
701 select HAVE_S3C_RTC if RTC_CLASS
703 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
707 bool "Samsung S5P6442"
711 select ARCH_USES_GETTIMEOFFSET
712 select HAVE_S3C2410_WATCHDOG if WATCHDOG
714 Samsung S5P6442 CPU based systems
717 bool "Samsung S5PC100"
721 select ARM_L1_CACHE_SHIFT_6
722 select ARCH_USES_GETTIMEOFFSET
723 select HAVE_S3C2410_I2C if I2C
724 select HAVE_S3C_RTC if RTC_CLASS
725 select HAVE_S3C2410_WATCHDOG if WATCHDOG
727 Samsung S5PC100 series based systems
730 bool "Samsung S5PV210/S5PC110"
732 select ARCH_SPARSEMEM_ENABLE
735 select ARM_L1_CACHE_SHIFT_6
736 select ARCH_HAS_CPUFREQ
737 select ARCH_USES_GETTIMEOFFSET
738 select HAVE_S3C2410_I2C if I2C
739 select HAVE_S3C_RTC if RTC_CLASS
740 select HAVE_S3C2410_WATCHDOG if WATCHDOG
742 Samsung S5PV210/S5PC110 series based systems
745 bool "Samsung S5PV310/S5PC210"
747 select ARCH_SPARSEMEM_ENABLE
750 select GENERIC_CLOCKEVENTS
751 select HAVE_S3C_RTC if RTC_CLASS
752 select HAVE_S3C2410_I2C if I2C
753 select HAVE_S3C2410_WATCHDOG if WATCHDOG
755 Samsung S5PV310 series based systems
764 select ARCH_USES_GETTIMEOFFSET
766 Support for the StrongARM based Digital DNARD machine, also known
767 as "Shark" (<http://www.shark-linux.de/shark.html>).
770 bool "Telechips TCC ARM926-based systems"
774 select GENERIC_CLOCKEVENTS
776 Support for Telechips TCC ARM926-based systems.
781 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
782 select ARCH_USES_GETTIMEOFFSET
784 Say Y here for systems based on one of the Sharp LH7A40X
785 System on a Chip processors. These CPUs include an ARM922T
786 core with a wide array of integrated devices for
787 hand-held and low-power applications.
790 bool "ST-Ericsson U300 Series"
793 select HAVE_SCHED_CLOCK
797 select GENERIC_CLOCKEVENTS
801 Support for ST-Ericsson U300 series mobile platforms.
804 bool "ST-Ericsson U8500 Series"
807 select GENERIC_CLOCKEVENTS
809 select ARCH_REQUIRE_GPIOLIB
811 Support for ST-Ericsson's Ux500 architecture
814 bool "STMicroelectronics Nomadik"
819 select GENERIC_CLOCKEVENTS
820 select ARCH_REQUIRE_GPIOLIB
822 Support for the Nomadik platform by ST-Ericsson
826 select GENERIC_CLOCKEVENTS
827 select ARCH_REQUIRE_GPIOLIB
831 select GENERIC_ALLOCATOR
832 select ARCH_HAS_HOLES_MEMORYMODEL
834 Support for TI's DaVinci platform.
839 select ARCH_REQUIRE_GPIOLIB
840 select ARCH_HAS_CPUFREQ
841 select GENERIC_CLOCKEVENTS
842 select HAVE_SCHED_CLOCK
843 select ARCH_HAS_HOLES_MEMORYMODEL
845 Support for TI's OMAP platform (OMAP1/2/3/4).
850 select ARCH_REQUIRE_GPIOLIB
852 select GENERIC_CLOCKEVENTS
855 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
860 # This is sorted alphabetically by mach-* pathname. However, plat-*
861 # Kconfigs may be included either alphabetically (according to the
862 # plat- suffix) or along side the corresponding mach-* source.
864 source "arch/arm/mach-aaec2000/Kconfig"
866 source "arch/arm/mach-at91/Kconfig"
868 source "arch/arm/mach-bcmring/Kconfig"
870 source "arch/arm/mach-clps711x/Kconfig"
872 source "arch/arm/mach-cns3xxx/Kconfig"
874 source "arch/arm/mach-davinci/Kconfig"
876 source "arch/arm/mach-dove/Kconfig"
878 source "arch/arm/mach-ep93xx/Kconfig"
880 source "arch/arm/mach-footbridge/Kconfig"
882 source "arch/arm/mach-gemini/Kconfig"
884 source "arch/arm/mach-h720x/Kconfig"
886 source "arch/arm/mach-integrator/Kconfig"
888 source "arch/arm/mach-iop32x/Kconfig"
890 source "arch/arm/mach-iop33x/Kconfig"
892 source "arch/arm/mach-iop13xx/Kconfig"
894 source "arch/arm/mach-ixp4xx/Kconfig"
896 source "arch/arm/mach-ixp2000/Kconfig"
898 source "arch/arm/mach-ixp23xx/Kconfig"
900 source "arch/arm/mach-kirkwood/Kconfig"
902 source "arch/arm/mach-ks8695/Kconfig"
904 source "arch/arm/mach-lh7a40x/Kconfig"
906 source "arch/arm/mach-loki/Kconfig"
908 source "arch/arm/mach-lpc32xx/Kconfig"
910 source "arch/arm/mach-msm/Kconfig"
912 source "arch/arm/mach-mv78xx0/Kconfig"
914 source "arch/arm/plat-mxc/Kconfig"
916 source "arch/arm/mach-netx/Kconfig"
918 source "arch/arm/mach-nomadik/Kconfig"
919 source "arch/arm/plat-nomadik/Kconfig"
921 source "arch/arm/mach-ns9xxx/Kconfig"
923 source "arch/arm/mach-nuc93x/Kconfig"
925 source "arch/arm/plat-omap/Kconfig"
927 source "arch/arm/mach-omap1/Kconfig"
929 source "arch/arm/mach-omap2/Kconfig"
931 source "arch/arm/mach-orion5x/Kconfig"
933 source "arch/arm/mach-pxa/Kconfig"
934 source "arch/arm/plat-pxa/Kconfig"
936 source "arch/arm/mach-mmp/Kconfig"
938 source "arch/arm/mach-realview/Kconfig"
940 source "arch/arm/mach-sa1100/Kconfig"
942 source "arch/arm/plat-samsung/Kconfig"
943 source "arch/arm/plat-s3c24xx/Kconfig"
944 source "arch/arm/plat-s5p/Kconfig"
946 source "arch/arm/plat-spear/Kconfig"
948 source "arch/arm/plat-tcc/Kconfig"
951 source "arch/arm/mach-s3c2400/Kconfig"
952 source "arch/arm/mach-s3c2410/Kconfig"
953 source "arch/arm/mach-s3c2412/Kconfig"
954 source "arch/arm/mach-s3c2416/Kconfig"
955 source "arch/arm/mach-s3c2440/Kconfig"
956 source "arch/arm/mach-s3c2443/Kconfig"
960 source "arch/arm/mach-s3c64xx/Kconfig"
963 source "arch/arm/mach-s5p64x0/Kconfig"
965 source "arch/arm/mach-s5p6442/Kconfig"
967 source "arch/arm/mach-s5pc100/Kconfig"
969 source "arch/arm/mach-s5pv210/Kconfig"
971 source "arch/arm/mach-s5pv310/Kconfig"
973 source "arch/arm/mach-shmobile/Kconfig"
975 source "arch/arm/plat-stmp3xxx/Kconfig"
977 source "arch/arm/mach-tegra/Kconfig"
979 source "arch/arm/mach-u300/Kconfig"
981 source "arch/arm/mach-ux500/Kconfig"
983 source "arch/arm/mach-versatile/Kconfig"
985 source "arch/arm/mach-vexpress/Kconfig"
987 source "arch/arm/mach-w90x900/Kconfig"
989 # Definitions to make life easier
995 select GENERIC_CLOCKEVENTS
996 select HAVE_SCHED_CLOCK
1004 config PLAT_VERSATILE
1007 config ARM_TIMER_SP804
1010 source arch/arm/mm/Kconfig
1013 bool "Enable iWMMXt support"
1014 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
1015 default y if PXA27x || PXA3xx || ARCH_MMP
1017 Enable support for iWMMXt context switching at run time if
1018 running on a CPU that supports it.
1020 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
1023 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
1027 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
1028 (!ARCH_OMAP3 || OMAP3_EMU)
1033 source "arch/arm/Kconfig-nommu"
1036 config ARM_ERRATA_411920
1037 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1040 Invalidation of the Instruction Cache operation can
1041 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1042 It does not affect the MPCore. This option enables the ARM Ltd.
1043 recommended workaround.
1045 config ARM_ERRATA_430973
1046 bool "ARM errata: Stale prediction on replaced interworking branch"
1049 This option enables the workaround for the 430973 Cortex-A8
1050 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1051 interworking branch is replaced with another code sequence at the
1052 same virtual address, whether due to self-modifying code or virtual
1053 to physical address re-mapping, Cortex-A8 does not recover from the
1054 stale interworking branch prediction. This results in Cortex-A8
1055 executing the new code sequence in the incorrect ARM or Thumb state.
1056 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1057 and also flushes the branch target cache at every context switch.
1058 Note that setting specific bits in the ACTLR register may not be
1059 available in non-secure mode.
1061 config ARM_ERRATA_458693
1062 bool "ARM errata: Processor deadlock when a false hazard is created"
1065 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1066 erratum. For very specific sequences of memory operations, it is
1067 possible for a hazard condition intended for a cache line to instead
1068 be incorrectly associated with a different cache line. This false
1069 hazard might then cause a processor deadlock. The workaround enables
1070 the L1 caching of the NEON accesses and disables the PLD instruction
1071 in the ACTLR register. Note that setting specific bits in the ACTLR
1072 register may not be available in non-secure mode.
1074 config ARM_ERRATA_460075
1075 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1078 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1079 erratum. Any asynchronous access to the L2 cache may encounter a
1080 situation in which recent store transactions to the L2 cache are lost
1081 and overwritten with stale memory contents from external memory. The
1082 workaround disables the write-allocate mode for the L2 cache via the
1083 ACTLR register. Note that setting specific bits in the ACTLR register
1084 may not be available in non-secure mode.
1086 config ARM_ERRATA_742230
1087 bool "ARM errata: DMB operation may be faulty"
1088 depends on CPU_V7 && SMP
1090 This option enables the workaround for the 742230 Cortex-A9
1091 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1092 between two write operations may not ensure the correct visibility
1093 ordering of the two writes. This workaround sets a specific bit in
1094 the diagnostic register of the Cortex-A9 which causes the DMB
1095 instruction to behave as a DSB, ensuring the correct behaviour of
1098 config ARM_ERRATA_742231
1099 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1100 depends on CPU_V7 && SMP
1102 This option enables the workaround for the 742231 Cortex-A9
1103 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1104 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1105 accessing some data located in the same cache line, may get corrupted
1106 data due to bad handling of the address hazard when the line gets
1107 replaced from one of the CPUs at the same time as another CPU is
1108 accessing it. This workaround sets specific bits in the diagnostic
1109 register of the Cortex-A9 which reduces the linefill issuing
1110 capabilities of the processor.
1112 config PL310_ERRATA_588369
1113 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1114 depends on CACHE_L2X0 && ARCH_OMAP4
1116 The PL310 L2 cache controller implements three types of Clean &
1117 Invalidate maintenance operations: by Physical Address
1118 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1119 They are architecturally defined to behave as the execution of a
1120 clean operation followed immediately by an invalidate operation,
1121 both performing to the same memory location. This functionality
1122 is not correctly implemented in PL310 as clean lines are not
1123 invalidated as a result of these operations. Note that this errata
1124 uses Texas Instrument's secure monitor api.
1126 config ARM_ERRATA_720789
1127 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1128 depends on CPU_V7 && SMP
1130 This option enables the workaround for the 720789 Cortex-A9 (prior to
1131 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1132 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1133 As a consequence of this erratum, some TLB entries which should be
1134 invalidated are not, resulting in an incoherency in the system page
1135 tables. The workaround changes the TLB flushing routines to invalidate
1136 entries regardless of the ASID.
1138 config ARM_ERRATA_743622
1139 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1142 This option enables the workaround for the 743622 Cortex-A9
1143 (r2p0..r2p2) erratum. Under very rare conditions, a faulty
1144 optimisation in the Cortex-A9 Store Buffer may lead to data
1145 corruption. This workaround sets a specific bit in the diagnostic
1146 register of the Cortex-A9 which disables the Store Buffer
1147 optimisation, preventing the defect from occurring. This has no
1148 visible impact on the overall performance or power consumption of the
1153 source "arch/arm/common/Kconfig"
1163 Find out whether you have ISA slots on your motherboard. ISA is the
1164 name of a bus system, i.e. the way the CPU talks to the other stuff
1165 inside your box. Other bus systems are PCI, EISA, MicroChannel
1166 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1167 newer boards don't support it. If you have ISA, say Y, otherwise N.
1169 # Select ISA DMA controller support
1174 # Select ISA DMA interface
1179 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE || ARCH_CNS3XXX
1181 Find out whether you have a PCI motherboard. PCI is the name of a
1182 bus system, i.e. the way the CPU talks to the other stuff inside
1183 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1184 VESA. If you have PCI, say Y, otherwise N.
1193 # Select the host bridge type
1194 config PCI_HOST_VIA82C505
1196 depends on PCI && ARCH_SHARK
1199 config PCI_HOST_ITE8152
1201 depends on PCI && MACH_ARMCORE
1205 source "drivers/pci/Kconfig"
1207 source "drivers/pcmcia/Kconfig"
1211 menu "Kernel Features"
1213 source "kernel/time/Kconfig"
1216 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1217 depends on EXPERIMENTAL
1218 depends on GENERIC_CLOCKEVENTS
1219 depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
1220 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1221 ARCH_S5PV310 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
1223 select USE_GENERIC_SMP_HELPERS
1224 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1226 This enables support for systems with more than one CPU. If you have
1227 a system with only one CPU, like most personal computers, say N. If
1228 you have a system with more than one CPU, say Y.
1230 If you say N here, the kernel will run on single and multiprocessor
1231 machines, but will use only one CPU of a multiprocessor machine. If
1232 you say Y here, the kernel will run on many, but not all, single
1233 processor machines. On a single processor machine, the kernel will
1234 run faster if you say N here.
1236 See also <file:Documentation/i386/IO-APIC.txt>,
1237 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1238 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1240 If you don't know what to do here, say N.
1243 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1244 depends on EXPERIMENTAL
1245 depends on SMP && !XIP && !THUMB2_KERNEL
1248 SMP kernels contain instructions which fail on non-SMP processors.
1249 Enabling this option allows the kernel to modify itself to make
1250 these instructions safe. Disabling it allows about 1K of space
1253 If you don't know what to do here, say Y.
1259 This option enables support for the ARM system coherency unit
1265 This options enables support for the ARM timer and watchdog unit
1268 prompt "Memory split"
1271 Select the desired split between kernel and user memory.
1273 If you are not absolutely sure what you are doing, leave this
1277 bool "3G/1G user/kernel split"
1279 bool "2G/2G user/kernel split"
1281 bool "1G/3G user/kernel split"
1286 default 0x40000000 if VMSPLIT_1G
1287 default 0x80000000 if VMSPLIT_2G
1291 int "Maximum number of CPUs (2-32)"
1297 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1298 depends on SMP && HOTPLUG && EXPERIMENTAL
1299 depends on !ARCH_MSM
1301 Say Y here to experiment with turning CPUs off and on. CPUs
1302 can be controlled through /sys/devices/system/cpu.
1305 bool "Use local timer interrupts"
1308 select HAVE_ARM_TWD if !ARCH_MSM_SCORPIONMP
1310 Enable support for local timers on SMP platforms, rather then the
1311 legacy IPI broadcast method. Local timers allows the system
1312 accounting to be spread across the timer interval, preventing a
1313 "thundering herd" at every timer tick.
1315 source kernel/Kconfig.preempt
1319 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
1320 ARCH_S5P6442 || ARCH_S5PV210 || ARCH_S5PV310
1321 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1322 default AT91_TIMER_HZ if ARCH_AT91
1323 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1326 config THUMB2_KERNEL
1327 bool "Compile the kernel in Thumb-2 mode"
1328 depends on CPU_V7 && EXPERIMENTAL
1330 select ARM_ASM_UNIFIED
1332 By enabling this option, the kernel will be compiled in
1333 Thumb-2 mode. A compiler/assembler that understand the unified
1334 ARM-Thumb syntax is needed.
1338 config ARM_ASM_UNIFIED
1342 bool "Use the ARM EABI to compile the kernel"
1344 This option allows for the kernel to be compiled using the latest
1345 ARM ABI (aka EABI). This is only useful if you are using a user
1346 space environment that is also compiled with EABI.
1348 Since there are major incompatibilities between the legacy ABI and
1349 EABI, especially with regard to structure member alignment, this
1350 option also changes the kernel syscall calling convention to
1351 disambiguate both ABIs and allow for backward compatibility support
1352 (selected with CONFIG_OABI_COMPAT).
1354 To use this you need GCC version 4.0.0 or later.
1357 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1358 depends on AEABI && EXPERIMENTAL
1361 This option preserves the old syscall interface along with the
1362 new (ARM EABI) one. It also provides a compatibility layer to
1363 intercept syscalls that have structure arguments which layout
1364 in memory differs between the legacy ABI and the new ARM EABI
1365 (only for non "thumb" binaries). This option adds a tiny
1366 overhead to all syscalls and produces a slightly larger kernel.
1367 If you know you'll be using only pure EABI user space then you
1368 can say N here. If this option is not selected and you attempt
1369 to execute a legacy ABI binary then the result will be
1370 UNPREDICTABLE (in fact it can be predicted that it won't work
1371 at all). If in doubt say Y.
1373 config ARCH_HAS_HOLES_MEMORYMODEL
1376 config ARCH_SPARSEMEM_ENABLE
1379 config ARCH_SPARSEMEM_DEFAULT
1380 def_bool ARCH_SPARSEMEM_ENABLE
1382 config ARCH_SELECT_MEMORY_MODEL
1383 def_bool ARCH_SPARSEMEM_ENABLE
1386 bool "High Memory Support (EXPERIMENTAL)"
1387 depends on MMU && EXPERIMENTAL
1389 The address space of ARM processors is only 4 Gigabytes large
1390 and it has to accommodate user address space, kernel address
1391 space as well as some memory mapped IO. That means that, if you
1392 have a large amount of physical memory and/or IO, not all of the
1393 memory can be "permanently mapped" by the kernel. The physical
1394 memory that is not permanently mapped is called "high memory".
1396 Depending on the selected kernel/user memory split, minimum
1397 vmalloc space and actual amount of RAM, you may not need this
1398 option which should result in a slightly faster kernel.
1403 bool "Allocate 2nd-level pagetables from highmem"
1405 depends on !OUTER_CACHE
1407 config HW_PERF_EVENTS
1408 bool "Enable hardware performance counter support for perf events"
1409 depends on PERF_EVENTS && CPU_HAS_PMU
1412 Enable hardware performance counter support for perf events. If
1413 disabled, perf events will use software events only.
1418 This enables support for sparse irqs. This is useful in general
1419 as most CPUs have a fairly sparse array of IRQ vectors, which
1420 the irq_desc then maps directly on to. Systems with a high
1421 number of off-chip IRQs will want to treat this as
1422 experimental until they have been independently verified.
1426 config FORCE_MAX_ZONEORDER
1427 int "Maximum zone order" if ARCH_SHMOBILE
1428 range 11 64 if ARCH_SHMOBILE
1429 default "9" if SA1111
1432 The kernel memory allocator divides physically contiguous memory
1433 blocks into "zones", where each zone is a power of two number of
1434 pages. This option selects the largest power of two that the kernel
1435 keeps in the memory allocator. If you need to allocate very large
1436 blocks of physically contiguous memory, then you may need to
1437 increase this value.
1439 This config option is actually maximum order plus one. For example,
1440 a value of 11 means that the largest free memory block is 2^10 pages.
1443 bool "Timer and CPU usage LEDs"
1444 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1445 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1446 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1447 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1448 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1449 ARCH_AT91 || ARCH_DAVINCI || \
1450 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1452 If you say Y here, the LEDs on your machine will be used
1453 to provide useful information about your current system status.
1455 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1456 be able to select which LEDs are active using the options below. If
1457 you are compiling a kernel for the EBSA-110 or the LART however, the
1458 red LED will simply flash regularly to indicate that the system is
1459 still functional. It is safe to say Y here if you have a CATS
1460 system, but the driver will do nothing.
1463 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1464 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1465 || MACH_OMAP_PERSEUS2
1467 depends on !GENERIC_CLOCKEVENTS
1468 default y if ARCH_EBSA110
1470 If you say Y here, one of the system LEDs (the green one on the
1471 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1472 will flash regularly to indicate that the system is still
1473 operational. This is mainly useful to kernel hackers who are
1474 debugging unstable kernels.
1476 The LART uses the same LED for both Timer LED and CPU usage LED
1477 functions. You may choose to use both, but the Timer LED function
1478 will overrule the CPU usage LED.
1481 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1483 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1484 || MACH_OMAP_PERSEUS2
1487 If you say Y here, the red LED will be used to give a good real
1488 time indication of CPU usage, by lighting whenever the idle task
1489 is not currently executing.
1491 The LART uses the same LED for both Timer LED and CPU usage LED
1492 functions. You may choose to use both, but the Timer LED function
1493 will overrule the CPU usage LED.
1495 config ALIGNMENT_TRAP
1497 depends on CPU_CP15_MMU
1498 default y if !ARCH_EBSA110
1499 select HAVE_PROC_CPU if PROC_FS
1501 ARM processors cannot fetch/store information which is not
1502 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1503 address divisible by 4. On 32-bit ARM processors, these non-aligned
1504 fetch/store instructions will be emulated in software if you say
1505 here, which has a severe performance impact. This is necessary for
1506 correct operation of some network protocols. With an IP-only
1507 configuration it is safe to say N, otherwise say Y.
1509 config UACCESS_WITH_MEMCPY
1510 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1511 depends on MMU && EXPERIMENTAL
1512 default y if CPU_FEROCEON
1514 Implement faster copy_to_user and clear_user methods for CPU
1515 cores where a 8-word STM instruction give significantly higher
1516 memory write throughput than a sequence of individual 32bit stores.
1518 A possible side effect is a slight increase in scheduling latency
1519 between threads sharing the same address space if they invoke
1520 such copy operations with large buffers.
1522 However, if the CPU data cache is using a write-allocate mode,
1523 this option is unlikely to provide any performance gain.
1527 prompt "Enable seccomp to safely compute untrusted bytecode"
1529 This kernel feature is useful for number crunching applications
1530 that may need to compute untrusted bytecode during their
1531 execution. By using pipes or other transports made available to
1532 the process as file descriptors supporting the read/write
1533 syscalls, it's possible to isolate those applications in
1534 their own address space using seccomp. Once seccomp is
1535 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1536 and the task is only allowed to execute a few safe syscalls
1537 defined by each seccomp mode.
1539 config CC_STACKPROTECTOR
1540 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1542 This option turns on the -fstack-protector GCC feature. This
1543 feature puts, at the beginning of functions, a canary value on
1544 the stack just before the return address, and validates
1545 the value just before actually returning. Stack based buffer
1546 overflows (that need to overwrite this return address) now also
1547 overwrite the canary, which gets detected and the attack is then
1548 neutralized via a kernel panic.
1549 This feature requires gcc version 4.2 or above.
1551 config DEPRECATED_PARAM_STRUCT
1552 bool "Provide old way to pass kernel parameters"
1554 This was deprecated in 2001 and announced to live on for 5 years.
1555 Some old boot loaders still use this way.
1561 # Compressed boot loader in ROM. Yes, we really want to ask about
1562 # TEXT and BSS so we preserve their values in the config files.
1563 config ZBOOT_ROM_TEXT
1564 hex "Compressed ROM boot loader base address"
1567 The physical address at which the ROM-able zImage is to be
1568 placed in the target. Platforms which normally make use of
1569 ROM-able zImage formats normally set this to a suitable
1570 value in their defconfig file.
1572 If ZBOOT_ROM is not enabled, this has no effect.
1574 config ZBOOT_ROM_BSS
1575 hex "Compressed ROM boot loader BSS address"
1578 The base address of an area of read/write memory in the target
1579 for the ROM-able zImage which must be available while the
1580 decompressor is running. It must be large enough to hold the
1581 entire decompressed kernel plus an additional 128 KiB.
1582 Platforms which normally make use of ROM-able zImage formats
1583 normally set this to a suitable value in their defconfig file.
1585 If ZBOOT_ROM is not enabled, this has no effect.
1588 bool "Compressed boot loader in ROM/flash"
1589 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1591 Say Y here if you intend to execute your compressed kernel image
1592 (zImage) directly from ROM or flash. If unsure, say N.
1595 string "Default kernel command string"
1598 On some architectures (EBSA110 and CATS), there is currently no way
1599 for the boot loader to pass arguments to the kernel. For these
1600 architectures, you should supply some command-line options at build
1601 time by entering them here. As a minimum, you should specify the
1602 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1604 config CMDLINE_FORCE
1605 bool "Always use the default kernel command string"
1606 depends on CMDLINE != ""
1608 Always use the default kernel command string, even if the boot
1609 loader passes other arguments to the kernel.
1610 This is useful if you cannot or don't want to change the
1611 command-line options your boot loader passes to the kernel.
1616 bool "Kernel Execute-In-Place from ROM"
1617 depends on !ZBOOT_ROM
1619 Execute-In-Place allows the kernel to run from non-volatile storage
1620 directly addressable by the CPU, such as NOR flash. This saves RAM
1621 space since the text section of the kernel is not loaded from flash
1622 to RAM. Read-write sections, such as the data section and stack,
1623 are still copied to RAM. The XIP kernel is not compressed since
1624 it has to run directly from flash, so it will take more space to
1625 store it. The flash address used to link the kernel object files,
1626 and for storing it, is configuration dependent. Therefore, if you
1627 say Y here, you must know the proper physical address where to
1628 store the kernel image depending on your own flash memory usage.
1630 Also note that the make target becomes "make xipImage" rather than
1631 "make zImage" or "make Image". The final kernel binary to put in
1632 ROM memory will be arch/arm/boot/xipImage.
1636 config XIP_PHYS_ADDR
1637 hex "XIP Kernel Physical Location"
1638 depends on XIP_KERNEL
1639 default "0x00080000"
1641 This is the physical address in your flash memory the kernel will
1642 be linked for and stored to. This address is dependent on your
1646 bool "Kexec system call (EXPERIMENTAL)"
1647 depends on EXPERIMENTAL
1649 kexec is a system call that implements the ability to shutdown your
1650 current kernel, and to start another kernel. It is like a reboot
1651 but it is independent of the system firmware. And like a reboot
1652 you can start any kernel with it, not just Linux.
1654 It is an ongoing process to be certain the hardware in a machine
1655 is properly shutdown, so do not be surprised if this code does not
1656 initially work for you. It may help to enable device hotplugging
1660 bool "Export atags in procfs"
1664 Should the atags used to boot the kernel be exported in an "atags"
1665 file in procfs. Useful with kexec.
1667 config AUTO_ZRELADDR
1668 bool "Auto calculation of the decompressed kernel image address"
1669 depends on !ZBOOT_ROM && !ARCH_U300
1671 ZRELADDR is the physical address where the decompressed kernel
1672 image will be placed. If AUTO_ZRELADDR is selected, the address
1673 will be determined at run-time by masking the current IP with
1674 0xf8000000. This assumes the zImage being placed in the first 128MB
1675 from start of memory.
1679 menu "CPU Power Management"
1683 source "drivers/cpufreq/Kconfig"
1686 tristate "CPUfreq driver for i.MX CPUs"
1687 depends on ARCH_MXC && CPU_FREQ
1689 This enables the CPUfreq driver for i.MX CPUs.
1691 config CPU_FREQ_SA1100
1694 config CPU_FREQ_SA1110
1697 config CPU_FREQ_INTEGRATOR
1698 tristate "CPUfreq driver for ARM Integrator CPUs"
1699 depends on ARCH_INTEGRATOR && CPU_FREQ
1702 This enables the CPUfreq driver for ARM Integrator CPUs.
1704 For details, take a look at <file:Documentation/cpu-freq>.
1710 depends on CPU_FREQ && ARCH_PXA && PXA25x
1712 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1714 config CPU_FREQ_S3C64XX
1715 bool "CPUfreq support for Samsung S3C64XX CPUs"
1716 depends on CPU_FREQ && CPU_S3C6410
1721 Internal configuration node for common cpufreq on Samsung SoC
1723 config CPU_FREQ_S3C24XX
1724 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1725 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1728 This enables the CPUfreq driver for the Samsung S3C24XX family
1731 For details, take a look at <file:Documentation/cpu-freq>.
1735 config CPU_FREQ_S3C24XX_PLL
1736 bool "Support CPUfreq changing of PLL frequency"
1737 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1739 Compile in support for changing the PLL frequency from the
1740 S3C24XX series CPUfreq driver. The PLL takes time to settle
1741 after a frequency change, so by default it is not enabled.
1743 This also means that the PLL tables for the selected CPU(s) will
1744 be built which may increase the size of the kernel image.
1746 config CPU_FREQ_S3C24XX_DEBUG
1747 bool "Debug CPUfreq Samsung driver core"
1748 depends on CPU_FREQ_S3C24XX
1750 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1752 config CPU_FREQ_S3C24XX_IODEBUG
1753 bool "Debug CPUfreq Samsung driver IO timing"
1754 depends on CPU_FREQ_S3C24XX
1756 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1758 config CPU_FREQ_S3C24XX_DEBUGFS
1759 bool "Export debugfs for CPUFreq"
1760 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1762 Export status information via debugfs.
1766 source "drivers/cpuidle/Kconfig"
1770 menu "Floating point emulation"
1772 comment "At least one emulation must be selected"
1775 bool "NWFPE math emulation"
1776 depends on !AEABI || OABI_COMPAT
1778 Say Y to include the NWFPE floating point emulator in the kernel.
1779 This is necessary to run most binaries. Linux does not currently
1780 support floating point hardware so you need to say Y here even if
1781 your machine has an FPA or floating point co-processor podule.
1783 You may say N here if you are going to load the Acorn FPEmulator
1784 early in the bootup.
1787 bool "Support extended precision"
1788 depends on FPE_NWFPE
1790 Say Y to include 80-bit support in the kernel floating-point
1791 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1792 Note that gcc does not generate 80-bit operations by default,
1793 so in most cases this option only enlarges the size of the
1794 floating point emulator without any good reason.
1796 You almost surely want to say N here.
1799 bool "FastFPE math emulation (EXPERIMENTAL)"
1800 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1802 Say Y here to include the FAST floating point emulator in the kernel.
1803 This is an experimental much faster emulator which now also has full
1804 precision for the mantissa. It does not support any exceptions.
1805 It is very simple, and approximately 3-6 times faster than NWFPE.
1807 It should be sufficient for most programs. It may be not suitable
1808 for scientific calculations, but you have to check this for yourself.
1809 If you do not feel you need a faster FP emulation you should better
1813 bool "VFP-format floating point maths"
1814 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1816 Say Y to include VFP support code in the kernel. This is needed
1817 if your hardware includes a VFP unit.
1819 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1820 release notes and additional status information.
1822 Say N if your target does not have VFP hardware.
1830 bool "Advanced SIMD (NEON) Extension support"
1831 depends on VFPv3 && CPU_V7
1833 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1838 menu "Userspace binary formats"
1840 source "fs/Kconfig.binfmt"
1843 tristate "RISC OS personality"
1846 Say Y here to include the kernel code necessary if you want to run
1847 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1848 experimental; if this sounds frightening, say N and sleep in peace.
1849 You can also say M here to compile this support as a module (which
1850 will be called arthur).
1854 menu "Power management options"
1856 source "kernel/power/Kconfig"
1858 config ARCH_SUSPEND_POSSIBLE
1863 source "net/Kconfig"
1865 source "drivers/Kconfig"
1869 source "arch/arm/Kconfig.debug"
1871 source "security/Kconfig"
1873 source "crypto/Kconfig"
1875 source "lib/Kconfig"