2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
15 select SYS_SUPPORTS_APM_EMULATION
16 select GENERIC_ATOMIC64 if (!CPU_32v6K)
17 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
19 select HAVE_KPROBES if (!XIP_KERNEL)
20 select HAVE_KRETPROBES if (HAVE_KPROBES)
21 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
22 select HAVE_GENERIC_DMA_COHERENT
23 select HAVE_KERNEL_GZIP
24 select HAVE_KERNEL_LZO
25 select HAVE_KERNEL_LZMA
26 select HAVE_PERF_EVENTS
27 select PERF_USE_VMALLOC
28 select HAVE_REGS_AND_STACK_ACCESS_API
30 The ARM series is a line of low-power-consumption RISC chip designs
31 licensed by ARM Ltd and targeted at embedded applications and
32 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
33 manufactured, but legacy ARM-based PC hardware remains popular in
34 Europe. There is an ARM Linux project with a web page at
35 <http://www.arm.linux.org.uk/>.
40 config SYS_SUPPORTS_APM_EMULATION
50 config ARCH_USES_GETTIMEOFFSET
54 config GENERIC_CLOCKEVENTS
57 config GENERIC_CLOCKEVENTS_BROADCAST
59 depends on GENERIC_CLOCKEVENTS
64 select GENERIC_ALLOCATOR
75 The Extended Industry Standard Architecture (EISA) bus was
76 developed as an open alternative to the IBM MicroChannel bus.
78 The EISA bus provided some of the features of the IBM MicroChannel
79 bus while maintaining backward compatibility with cards made for
80 the older ISA bus. The EISA bus saw limited use between 1988 and
81 1995 when it was made obsolete by the PCI bus.
83 Say Y here if you are building a kernel for an EISA-based machine.
93 MicroChannel Architecture is found in some IBM PS/2 machines and
94 laptops. It is a bus system similar to PCI or ISA. See
95 <file:Documentation/mca.txt> (and especially the web page given
96 there) before attempting to build an MCA bus kernel.
98 config GENERIC_HARDIRQS
102 config STACKTRACE_SUPPORT
106 config HAVE_LATENCYTOP_SUPPORT
111 config LOCKDEP_SUPPORT
115 config TRACE_IRQFLAGS_SUPPORT
119 config HARDIRQS_SW_RESEND
123 config GENERIC_IRQ_PROBE
127 config GENERIC_LOCKBREAK
130 depends on SMP && PREEMPT
132 config RWSEM_GENERIC_SPINLOCK
136 config RWSEM_XCHGADD_ALGORITHM
139 config ARCH_HAS_ILOG2_U32
142 config ARCH_HAS_ILOG2_U64
145 config ARCH_HAS_CPUFREQ
148 Internal node to signify that the ARCH has CPUFREQ support
149 and that the relevant menu configurations are displayed for
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
278 select ARCH_USES_GETTIMEOFFSET
280 This enables support for systems based on the Atmel AT91RM9200,
281 AT91SAM9 and AT91CAP9 processors.
284 bool "Broadcom BCMRING"
289 select GENERIC_CLOCKEVENTS
290 select ARCH_WANT_OPTIONAL_GPIOLIB
292 Support for Broadcom's BCMRing platform.
295 bool "Cirrus Logic CLPS711x/EP721x-based"
297 select ARCH_USES_GETTIMEOFFSET
299 Support for Cirrus Logic 711x/721x based boards.
302 bool "Cavium Networks CNS3XXX family"
304 select GENERIC_CLOCKEVENTS
306 select PCI_DOMAINS if PCI
308 Support for Cavium Networks CNS3XXX platform.
311 bool "Cortina Systems Gemini"
313 select ARCH_REQUIRE_GPIOLIB
314 select ARCH_USES_GETTIMEOFFSET
316 Support for the Cortina Systems Gemini family SoCs
323 select ARCH_USES_GETTIMEOFFSET
325 This is an evaluation board for the StrongARM processor available
326 from Digital. It has limited hardware on-board, including an
327 Ethernet interface, two PCMCIA sockets, two serial ports and a
336 select ARCH_REQUIRE_GPIOLIB
337 select ARCH_HAS_HOLES_MEMORYMODEL
338 select ARCH_USES_GETTIMEOFFSET
340 This enables support for the Cirrus EP93xx series of CPUs.
342 config ARCH_FOOTBRIDGE
346 select ARCH_USES_GETTIMEOFFSET
348 Support for systems based on the DC21285 companion chip
349 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
352 bool "Freescale MXC/iMX-based"
353 select GENERIC_CLOCKEVENTS
354 select ARCH_REQUIRE_GPIOLIB
357 Support for Freescale MXC/iMX-based family of processors
360 bool "Freescale STMP3xxx"
363 select ARCH_REQUIRE_GPIOLIB
364 select GENERIC_CLOCKEVENTS
365 select USB_ARCH_HAS_EHCI
367 Support for systems based on the Freescale 3xxx CPUs.
370 bool "Hilscher NetX based"
373 select GENERIC_CLOCKEVENTS
375 This enables support for systems based on the Hilscher NetX Soc
378 bool "Hynix HMS720x-based"
381 select ARCH_USES_GETTIMEOFFSET
383 This enables support for systems based on the Hynix HMS720x
391 select ARCH_SUPPORTS_MSI
394 Support for Intel's IOP13XX (XScale) family of processors.
402 select ARCH_REQUIRE_GPIOLIB
404 Support for Intel's 80219 and IOP32X (XScale) family of
413 select ARCH_REQUIRE_GPIOLIB
415 Support for Intel's IOP33X (XScale) family of processors.
422 select ARCH_USES_GETTIMEOFFSET
424 Support for Intel's IXP23xx (XScale) family of processors.
427 bool "IXP2400/2800-based"
431 select ARCH_USES_GETTIMEOFFSET
433 Support for Intel's IXP2400/2800 (XScale) family of processors.
440 select GENERIC_CLOCKEVENTS
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
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
590 select ARCH_REQUIRE_GPIOLIB
592 Support for Qualcomm MSM/QSD based systems. This runs on the
593 apps processor of the MSM/QSD and depends on a shared memory
594 interface to the modem processor which runs the baseband
595 stack and controls some vital subsystems
596 (clock and power control, etc).
599 bool "Renesas SH-Mobile"
601 Support for Renesas's SH-Mobile ARM platforms
608 select ARCH_MAY_HAVE_PC_FDC
609 select HAVE_PATA_PLATFORM
612 select ARCH_SPARSEMEM_ENABLE
613 select ARCH_USES_GETTIMEOFFSET
615 On the Acorn Risc-PC, Linux can support the internal IDE disk and
616 CD-ROM interface, serial and parallel port, and the floppy drive.
622 select ARCH_SPARSEMEM_ENABLE
624 select ARCH_HAS_CPUFREQ
626 select GENERIC_CLOCKEVENTS
629 select ARCH_REQUIRE_GPIOLIB
631 Support for StrongARM 11x0 based boards.
634 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
636 select ARCH_HAS_CPUFREQ
638 select ARCH_USES_GETTIMEOFFSET
639 select HAVE_S3C2410_I2C
641 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
642 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
643 the Samsung SMDK2410 development board (and derivatives).
645 Note, the S3C2416 and the S3C2450 are so close that they even share
646 the same SoC ID code. This means that there is no seperate machine
647 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
650 bool "Samsung S3C64XX"
656 select ARCH_USES_GETTIMEOFFSET
657 select ARCH_HAS_CPUFREQ
658 select ARCH_REQUIRE_GPIOLIB
659 select SAMSUNG_CLKSRC
660 select SAMSUNG_IRQ_VIC_TIMER
661 select SAMSUNG_IRQ_UART
662 select S3C_GPIO_TRACK
663 select S3C_GPIO_PULL_UPDOWN
664 select S3C_GPIO_CFG_S3C24XX
665 select S3C_GPIO_CFG_S3C64XX
667 select USB_ARCH_HAS_OHCI
668 select SAMSUNG_GPIOLIB_4BIT
669 select HAVE_S3C2410_I2C
670 select HAVE_S3C2410_WATCHDOG
672 Samsung S3C64XX series based systems
675 bool "Samsung S5P6440"
679 select HAVE_S3C2410_WATCHDOG
680 select ARCH_USES_GETTIMEOFFSET
681 select HAVE_S3C2410_I2C
684 Samsung S5P6440 CPU based systems
687 bool "Samsung S5P6442"
691 select ARCH_USES_GETTIMEOFFSET
692 select HAVE_S3C2410_WATCHDOG
694 Samsung S5P6442 CPU based systems
697 bool "Samsung S5PC100"
701 select ARM_L1_CACHE_SHIFT_6
702 select ARCH_USES_GETTIMEOFFSET
703 select HAVE_S3C2410_I2C
705 select HAVE_S3C2410_WATCHDOG
707 Samsung S5PC100 series based systems
710 bool "Samsung S5PV210/S5PC110"
714 select ARM_L1_CACHE_SHIFT_6
715 select ARCH_USES_GETTIMEOFFSET
716 select HAVE_S3C2410_I2C
718 select HAVE_S3C2410_WATCHDOG
720 Samsung S5PV210/S5PC110 series based systems
723 bool "Samsung S5PV310/S5PC210"
727 select GENERIC_CLOCKEVENTS
729 Samsung S5PV310 series based systems
738 select ARCH_USES_GETTIMEOFFSET
740 Support for the StrongARM based Digital DNARD machine, also known
741 as "Shark" (<http://www.shark-linux.de/shark.html>).
746 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
747 select ARCH_USES_GETTIMEOFFSET
749 Say Y here for systems based on one of the Sharp LH7A40X
750 System on a Chip processors. These CPUs include an ARM922T
751 core with a wide array of integrated devices for
752 hand-held and low-power applications.
755 bool "ST-Ericsson U300 Series"
761 select GENERIC_CLOCKEVENTS
765 Support for ST-Ericsson U300 series mobile platforms.
768 bool "ST-Ericsson U8500 Series"
771 select GENERIC_CLOCKEVENTS
773 select ARCH_REQUIRE_GPIOLIB
775 Support for ST-Ericsson's Ux500 architecture
778 bool "STMicroelectronics Nomadik"
783 select GENERIC_CLOCKEVENTS
784 select ARCH_REQUIRE_GPIOLIB
786 Support for the Nomadik platform by ST-Ericsson
790 select GENERIC_CLOCKEVENTS
791 select ARCH_REQUIRE_GPIOLIB
795 select GENERIC_ALLOCATOR
796 select ARCH_HAS_HOLES_MEMORYMODEL
798 Support for TI's DaVinci platform.
803 select ARCH_REQUIRE_GPIOLIB
804 select ARCH_HAS_CPUFREQ
805 select GENERIC_CLOCKEVENTS
806 select ARCH_HAS_HOLES_MEMORYMODEL
808 Support for TI's OMAP platform (OMAP1 and OMAP2).
813 select ARCH_REQUIRE_GPIOLIB
815 select GENERIC_CLOCKEVENTS
818 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
823 # This is sorted alphabetically by mach-* pathname. However, plat-*
824 # Kconfigs may be included either alphabetically (according to the
825 # plat- suffix) or along side the corresponding mach-* source.
827 source "arch/arm/mach-aaec2000/Kconfig"
829 source "arch/arm/mach-at91/Kconfig"
831 source "arch/arm/mach-bcmring/Kconfig"
833 source "arch/arm/mach-clps711x/Kconfig"
835 source "arch/arm/mach-cns3xxx/Kconfig"
837 source "arch/arm/mach-davinci/Kconfig"
839 source "arch/arm/mach-dove/Kconfig"
841 source "arch/arm/mach-ep93xx/Kconfig"
843 source "arch/arm/mach-footbridge/Kconfig"
845 source "arch/arm/mach-gemini/Kconfig"
847 source "arch/arm/mach-h720x/Kconfig"
849 source "arch/arm/mach-integrator/Kconfig"
851 source "arch/arm/mach-iop32x/Kconfig"
853 source "arch/arm/mach-iop33x/Kconfig"
855 source "arch/arm/mach-iop13xx/Kconfig"
857 source "arch/arm/mach-ixp4xx/Kconfig"
859 source "arch/arm/mach-ixp2000/Kconfig"
861 source "arch/arm/mach-ixp23xx/Kconfig"
863 source "arch/arm/mach-kirkwood/Kconfig"
865 source "arch/arm/mach-ks8695/Kconfig"
867 source "arch/arm/mach-lh7a40x/Kconfig"
869 source "arch/arm/mach-loki/Kconfig"
871 source "arch/arm/mach-lpc32xx/Kconfig"
873 source "arch/arm/mach-msm/Kconfig"
875 source "arch/arm/mach-mv78xx0/Kconfig"
877 source "arch/arm/plat-mxc/Kconfig"
879 source "arch/arm/mach-netx/Kconfig"
881 source "arch/arm/mach-nomadik/Kconfig"
882 source "arch/arm/plat-nomadik/Kconfig"
884 source "arch/arm/mach-ns9xxx/Kconfig"
886 source "arch/arm/mach-nuc93x/Kconfig"
888 source "arch/arm/plat-omap/Kconfig"
890 source "arch/arm/mach-omap1/Kconfig"
892 source "arch/arm/mach-omap2/Kconfig"
894 source "arch/arm/mach-orion5x/Kconfig"
896 source "arch/arm/mach-pxa/Kconfig"
897 source "arch/arm/plat-pxa/Kconfig"
899 source "arch/arm/mach-mmp/Kconfig"
901 source "arch/arm/mach-realview/Kconfig"
903 source "arch/arm/mach-sa1100/Kconfig"
905 source "arch/arm/plat-samsung/Kconfig"
906 source "arch/arm/plat-s3c24xx/Kconfig"
907 source "arch/arm/plat-s5p/Kconfig"
909 source "arch/arm/plat-spear/Kconfig"
912 source "arch/arm/mach-s3c2400/Kconfig"
913 source "arch/arm/mach-s3c2410/Kconfig"
914 source "arch/arm/mach-s3c2412/Kconfig"
915 source "arch/arm/mach-s3c2416/Kconfig"
916 source "arch/arm/mach-s3c2440/Kconfig"
917 source "arch/arm/mach-s3c2443/Kconfig"
921 source "arch/arm/mach-s3c64xx/Kconfig"
924 source "arch/arm/mach-s5p6440/Kconfig"
926 source "arch/arm/mach-s5p6442/Kconfig"
928 source "arch/arm/mach-s5pc100/Kconfig"
930 source "arch/arm/mach-s5pv210/Kconfig"
932 source "arch/arm/mach-s5pv310/Kconfig"
934 source "arch/arm/mach-shmobile/Kconfig"
936 source "arch/arm/plat-stmp3xxx/Kconfig"
938 source "arch/arm/mach-u300/Kconfig"
940 source "arch/arm/mach-ux500/Kconfig"
942 source "arch/arm/mach-versatile/Kconfig"
944 source "arch/arm/mach-vexpress/Kconfig"
946 source "arch/arm/mach-w90x900/Kconfig"
948 # Definitions to make life easier
954 select GENERIC_CLOCKEVENTS
962 config PLAT_VERSATILE
965 config ARM_TIMER_SP804
968 source arch/arm/mm/Kconfig
971 bool "Enable iWMMXt support"
972 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
973 default y if PXA27x || PXA3xx || ARCH_MMP
975 Enable support for iWMMXt context switching at run time if
976 running on a CPU that supports it.
978 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
981 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
985 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
986 (!ARCH_OMAP3 || OMAP3_EMU)
991 source "arch/arm/Kconfig-nommu"
994 config ARM_ERRATA_411920
995 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
996 depends on CPU_V6 && !SMP
998 Invalidation of the Instruction Cache operation can
999 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1000 It does not affect the MPCore. This option enables the ARM Ltd.
1001 recommended workaround.
1003 config ARM_ERRATA_430973
1004 bool "ARM errata: Stale prediction on replaced interworking branch"
1007 This option enables the workaround for the 430973 Cortex-A8
1008 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1009 interworking branch is replaced with another code sequence at the
1010 same virtual address, whether due to self-modifying code or virtual
1011 to physical address re-mapping, Cortex-A8 does not recover from the
1012 stale interworking branch prediction. This results in Cortex-A8
1013 executing the new code sequence in the incorrect ARM or Thumb state.
1014 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1015 and also flushes the branch target cache at every context switch.
1016 Note that setting specific bits in the ACTLR register may not be
1017 available in non-secure mode.
1019 config ARM_ERRATA_458693
1020 bool "ARM errata: Processor deadlock when a false hazard is created"
1023 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1024 erratum. For very specific sequences of memory operations, it is
1025 possible for a hazard condition intended for a cache line to instead
1026 be incorrectly associated with a different cache line. This false
1027 hazard might then cause a processor deadlock. The workaround enables
1028 the L1 caching of the NEON accesses and disables the PLD instruction
1029 in the ACTLR register. Note that setting specific bits in the ACTLR
1030 register may not be available in non-secure mode.
1032 config ARM_ERRATA_460075
1033 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1036 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1037 erratum. Any asynchronous access to the L2 cache may encounter a
1038 situation in which recent store transactions to the L2 cache are lost
1039 and overwritten with stale memory contents from external memory. The
1040 workaround disables the write-allocate mode for the L2 cache via the
1041 ACTLR register. Note that setting specific bits in the ACTLR register
1042 may not be available in non-secure mode.
1044 config PL310_ERRATA_588369
1045 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1046 depends on CACHE_L2X0 && ARCH_OMAP4
1048 The PL310 L2 cache controller implements three types of Clean &
1049 Invalidate maintenance operations: by Physical Address
1050 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1051 They are architecturally defined to behave as the execution of a
1052 clean operation followed immediately by an invalidate operation,
1053 both performing to the same memory location. This functionality
1054 is not correctly implemented in PL310 as clean lines are not
1055 invalidated as a result of these operations. Note that this errata
1056 uses Texas Instrument's secure monitor api.
1059 source "arch/arm/common/Kconfig"
1069 Find out whether you have ISA slots on your motherboard. ISA is the
1070 name of a bus system, i.e. the way the CPU talks to the other stuff
1071 inside your box. Other bus systems are PCI, EISA, MicroChannel
1072 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1073 newer boards don't support it. If you have ISA, say Y, otherwise N.
1075 # Select ISA DMA controller support
1080 # Select ISA DMA interface
1085 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE || ARCH_CNS3XXX
1087 Find out whether you have a PCI motherboard. PCI is the name of a
1088 bus system, i.e. the way the CPU talks to the other stuff inside
1089 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1090 VESA. If you have PCI, say Y, otherwise N.
1099 # Select the host bridge type
1100 config PCI_HOST_VIA82C505
1102 depends on PCI && ARCH_SHARK
1105 config PCI_HOST_ITE8152
1107 depends on PCI && MACH_ARMCORE
1111 source "drivers/pci/Kconfig"
1113 source "drivers/pcmcia/Kconfig"
1117 menu "Kernel Features"
1119 source "kernel/time/Kconfig"
1122 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1123 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1124 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1125 ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || ARCH_S5PV310)
1126 depends on GENERIC_CLOCKEVENTS
1127 select USE_GENERIC_SMP_HELPERS
1128 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 ||\
1131 This enables support for systems with more than one CPU. If you have
1132 a system with only one CPU, like most personal computers, say N. If
1133 you have a system with more than one CPU, say Y.
1135 If you say N here, the kernel will run on single and multiprocessor
1136 machines, but will use only one CPU of a multiprocessor machine. If
1137 you say Y here, the kernel will run on many, but not all, single
1138 processor machines. On a single processor machine, the kernel will
1139 run faster if you say N here.
1141 See also <file:Documentation/i386/IO-APIC.txt>,
1142 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1143 <http://www.linuxdoc.org/docs.html#howto>.
1145 If you don't know what to do here, say N.
1151 This option enables support for the ARM system coherency unit
1157 This options enables support for the ARM timer and watchdog unit
1160 prompt "Memory split"
1163 Select the desired split between kernel and user memory.
1165 If you are not absolutely sure what you are doing, leave this
1169 bool "3G/1G user/kernel split"
1171 bool "2G/2G user/kernel split"
1173 bool "1G/3G user/kernel split"
1178 default 0x40000000 if VMSPLIT_1G
1179 default 0x80000000 if VMSPLIT_2G
1183 int "Maximum number of CPUs (2-32)"
1189 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1190 depends on SMP && HOTPLUG && EXPERIMENTAL
1192 Say Y here to experiment with turning CPUs off and on. CPUs
1193 can be controlled through /sys/devices/system/cpu.
1196 bool "Use local timer interrupts"
1197 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1198 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1199 ARCH_S5PV310 || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1200 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_S5PV310 || \
1201 ARCH_U8500 || ARCH_VEXPRESS)
1203 Enable support for local timers on SMP platforms, rather then the
1204 legacy IPI broadcast method. Local timers allows the system
1205 accounting to be spread across the timer interval, preventing a
1206 "thundering herd" at every timer tick.
1208 source kernel/Kconfig.preempt
1212 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || \
1213 ARCH_S5P6442 || ARCH_S5PV210 || ARCH_S5PV310
1214 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1215 default AT91_TIMER_HZ if ARCH_AT91
1216 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1219 config THUMB2_KERNEL
1220 bool "Compile the kernel in Thumb-2 mode"
1221 depends on CPU_V7 && EXPERIMENTAL
1223 select ARM_ASM_UNIFIED
1225 By enabling this option, the kernel will be compiled in
1226 Thumb-2 mode. A compiler/assembler that understand the unified
1227 ARM-Thumb syntax is needed.
1231 config ARM_ASM_UNIFIED
1235 bool "Use the ARM EABI to compile the kernel"
1237 This option allows for the kernel to be compiled using the latest
1238 ARM ABI (aka EABI). This is only useful if you are using a user
1239 space environment that is also compiled with EABI.
1241 Since there are major incompatibilities between the legacy ABI and
1242 EABI, especially with regard to structure member alignment, this
1243 option also changes the kernel syscall calling convention to
1244 disambiguate both ABIs and allow for backward compatibility support
1245 (selected with CONFIG_OABI_COMPAT).
1247 To use this you need GCC version 4.0.0 or later.
1250 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1251 depends on AEABI && EXPERIMENTAL
1254 This option preserves the old syscall interface along with the
1255 new (ARM EABI) one. It also provides a compatibility layer to
1256 intercept syscalls that have structure arguments which layout
1257 in memory differs between the legacy ABI and the new ARM EABI
1258 (only for non "thumb" binaries). This option adds a tiny
1259 overhead to all syscalls and produces a slightly larger kernel.
1260 If you know you'll be using only pure EABI user space then you
1261 can say N here. If this option is not selected and you attempt
1262 to execute a legacy ABI binary then the result will be
1263 UNPREDICTABLE (in fact it can be predicted that it won't work
1264 at all). If in doubt say Y.
1266 config ARCH_HAS_HOLES_MEMORYMODEL
1269 config ARCH_SPARSEMEM_ENABLE
1272 config ARCH_SPARSEMEM_DEFAULT
1273 def_bool ARCH_SPARSEMEM_ENABLE
1275 config ARCH_SELECT_MEMORY_MODEL
1276 def_bool ARCH_SPARSEMEM_ENABLE
1279 bool "High Memory Support (EXPERIMENTAL)"
1280 depends on MMU && EXPERIMENTAL
1282 The address space of ARM processors is only 4 Gigabytes large
1283 and it has to accommodate user address space, kernel address
1284 space as well as some memory mapped IO. That means that, if you
1285 have a large amount of physical memory and/or IO, not all of the
1286 memory can be "permanently mapped" by the kernel. The physical
1287 memory that is not permanently mapped is called "high memory".
1289 Depending on the selected kernel/user memory split, minimum
1290 vmalloc space and actual amount of RAM, you may not need this
1291 option which should result in a slightly faster kernel.
1296 bool "Allocate 2nd-level pagetables from highmem"
1298 depends on !OUTER_CACHE
1300 config HW_PERF_EVENTS
1301 bool "Enable hardware performance counter support for perf events"
1302 depends on PERF_EVENTS && CPU_HAS_PMU
1305 Enable hardware performance counter support for perf events. If
1306 disabled, perf events will use software events only.
1311 This enables support for sparse irqs. This is useful in general
1312 as most CPUs have a fairly sparse array of IRQ vectors, which
1313 the irq_desc then maps directly on to. Systems with a high
1314 number of off-chip IRQs will want to treat this as
1315 experimental until they have been independently verified.
1319 config FORCE_MAX_ZONEORDER
1320 int "Maximum zone order" if ARCH_SHMOBILE
1321 range 11 64 if ARCH_SHMOBILE
1322 default "9" if SA1111
1325 The kernel memory allocator divides physically contiguous memory
1326 blocks into "zones", where each zone is a power of two number of
1327 pages. This option selects the largest power of two that the kernel
1328 keeps in the memory allocator. If you need to allocate very large
1329 blocks of physically contiguous memory, then you may need to
1330 increase this value.
1332 This config option is actually maximum order plus one. For example,
1333 a value of 11 means that the largest free memory block is 2^10 pages.
1336 bool "Timer and CPU usage LEDs"
1337 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1338 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1339 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1340 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1341 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1342 ARCH_AT91 || ARCH_DAVINCI || \
1343 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1345 If you say Y here, the LEDs on your machine will be used
1346 to provide useful information about your current system status.
1348 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1349 be able to select which LEDs are active using the options below. If
1350 you are compiling a kernel for the EBSA-110 or the LART however, the
1351 red LED will simply flash regularly to indicate that the system is
1352 still functional. It is safe to say Y here if you have a CATS
1353 system, but the driver will do nothing.
1356 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1357 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1358 || MACH_OMAP_PERSEUS2
1360 depends on !GENERIC_CLOCKEVENTS
1361 default y if ARCH_EBSA110
1363 If you say Y here, one of the system LEDs (the green one on the
1364 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1365 will flash regularly to indicate that the system is still
1366 operational. This is mainly useful to kernel hackers who are
1367 debugging unstable kernels.
1369 The LART uses the same LED for both Timer LED and CPU usage LED
1370 functions. You may choose to use both, but the Timer LED function
1371 will overrule the CPU usage LED.
1374 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1376 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1377 || MACH_OMAP_PERSEUS2
1380 If you say Y here, the red LED will be used to give a good real
1381 time indication of CPU usage, by lighting whenever the idle task
1382 is not currently executing.
1384 The LART uses the same LED for both Timer LED and CPU usage LED
1385 functions. You may choose to use both, but the Timer LED function
1386 will overrule the CPU usage LED.
1388 config ALIGNMENT_TRAP
1390 depends on CPU_CP15_MMU
1391 default y if !ARCH_EBSA110
1392 select HAVE_PROC_CPU if PROC_FS
1394 ARM processors cannot fetch/store information which is not
1395 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1396 address divisible by 4. On 32-bit ARM processors, these non-aligned
1397 fetch/store instructions will be emulated in software if you say
1398 here, which has a severe performance impact. This is necessary for
1399 correct operation of some network protocols. With an IP-only
1400 configuration it is safe to say N, otherwise say Y.
1402 config UACCESS_WITH_MEMCPY
1403 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1404 depends on MMU && EXPERIMENTAL
1405 default y if CPU_FEROCEON
1407 Implement faster copy_to_user and clear_user methods for CPU
1408 cores where a 8-word STM instruction give significantly higher
1409 memory write throughput than a sequence of individual 32bit stores.
1411 A possible side effect is a slight increase in scheduling latency
1412 between threads sharing the same address space if they invoke
1413 such copy operations with large buffers.
1415 However, if the CPU data cache is using a write-allocate mode,
1416 this option is unlikely to provide any performance gain.
1418 config CC_STACKPROTECTOR
1419 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1421 This option turns on the -fstack-protector GCC feature. This
1422 feature puts, at the beginning of functions, a canary value on
1423 the stack just before the return address, and validates
1424 the value just before actually returning. Stack based buffer
1425 overflows (that need to overwrite this return address) now also
1426 overwrite the canary, which gets detected and the attack is then
1427 neutralized via a kernel panic.
1428 This feature requires gcc version 4.2 or above.
1430 config DEPRECATED_PARAM_STRUCT
1431 bool "Provide old way to pass kernel parameters"
1433 This was deprecated in 2001 and announced to live on for 5 years.
1434 Some old boot loaders still use this way.
1440 # Compressed boot loader in ROM. Yes, we really want to ask about
1441 # TEXT and BSS so we preserve their values in the config files.
1442 config ZBOOT_ROM_TEXT
1443 hex "Compressed ROM boot loader base address"
1446 The physical address at which the ROM-able zImage is to be
1447 placed in the target. Platforms which normally make use of
1448 ROM-able zImage formats normally set this to a suitable
1449 value in their defconfig file.
1451 If ZBOOT_ROM is not enabled, this has no effect.
1453 config ZBOOT_ROM_BSS
1454 hex "Compressed ROM boot loader BSS address"
1457 The base address of an area of read/write memory in the target
1458 for the ROM-able zImage which must be available while the
1459 decompressor is running. It must be large enough to hold the
1460 entire decompressed kernel plus an additional 128 KiB.
1461 Platforms which normally make use of ROM-able zImage formats
1462 normally set this to a suitable value in their defconfig file.
1464 If ZBOOT_ROM is not enabled, this has no effect.
1467 bool "Compressed boot loader in ROM/flash"
1468 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1470 Say Y here if you intend to execute your compressed kernel image
1471 (zImage) directly from ROM or flash. If unsure, say N.
1474 string "Default kernel command string"
1477 On some architectures (EBSA110 and CATS), there is currently no way
1478 for the boot loader to pass arguments to the kernel. For these
1479 architectures, you should supply some command-line options at build
1480 time by entering them here. As a minimum, you should specify the
1481 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1483 config CMDLINE_FORCE
1484 bool "Always use the default kernel command string"
1485 depends on CMDLINE != ""
1487 Always use the default kernel command string, even if the boot
1488 loader passes other arguments to the kernel.
1489 This is useful if you cannot or don't want to change the
1490 command-line options your boot loader passes to the kernel.
1495 bool "Kernel Execute-In-Place from ROM"
1496 depends on !ZBOOT_ROM
1498 Execute-In-Place allows the kernel to run from non-volatile storage
1499 directly addressable by the CPU, such as NOR flash. This saves RAM
1500 space since the text section of the kernel is not loaded from flash
1501 to RAM. Read-write sections, such as the data section and stack,
1502 are still copied to RAM. The XIP kernel is not compressed since
1503 it has to run directly from flash, so it will take more space to
1504 store it. The flash address used to link the kernel object files,
1505 and for storing it, is configuration dependent. Therefore, if you
1506 say Y here, you must know the proper physical address where to
1507 store the kernel image depending on your own flash memory usage.
1509 Also note that the make target becomes "make xipImage" rather than
1510 "make zImage" or "make Image". The final kernel binary to put in
1511 ROM memory will be arch/arm/boot/xipImage.
1515 config XIP_PHYS_ADDR
1516 hex "XIP Kernel Physical Location"
1517 depends on XIP_KERNEL
1518 default "0x00080000"
1520 This is the physical address in your flash memory the kernel will
1521 be linked for and stored to. This address is dependent on your
1525 bool "Kexec system call (EXPERIMENTAL)"
1526 depends on EXPERIMENTAL
1528 kexec is a system call that implements the ability to shutdown your
1529 current kernel, and to start another kernel. It is like a reboot
1530 but it is independent of the system firmware. And like a reboot
1531 you can start any kernel with it, not just Linux.
1533 It is an ongoing process to be certain the hardware in a machine
1534 is properly shutdown, so do not be surprised if this code does not
1535 initially work for you. It may help to enable device hotplugging
1539 bool "Export atags in procfs"
1543 Should the atags used to boot the kernel be exported in an "atags"
1544 file in procfs. Useful with kexec.
1546 config AUTO_ZRELADDR
1547 bool "Auto calculation of the decompressed kernel image address"
1548 depends on !ZBOOT_ROM && !ARCH_U300
1550 ZRELADDR is the physical address where the decompressed kernel
1551 image will be placed. If AUTO_ZRELADDR is selected, the address
1552 will be determined at run-time by masking the current IP with
1553 0xf8000000. This assumes the zImage being placed in the first 128MB
1554 from start of memory.
1557 hex "Physical address of the decompressed kernel image"
1558 depends on !AUTO_ZRELADDR
1559 default 0x00008000 if ARCH_BCMRING ||\
1584 default 0x08008000 if ARCH_MX1 ||\
1586 default 0x10008000 if ARCH_MSM ||\
1589 default 0x20008000 if ARCH_S5P6440 ||\
1593 default 0x30008000 if ARCH_S3C2410 ||\
1599 default 0x40008000 if ARCH_STMP378X ||\
1603 default 0x50008000 if ARCH_S3C64XX ||\
1605 default 0x60008000 if ARCH_VEXPRESS
1606 default 0x80008000 if ARCH_MX25 ||\
1611 default 0x90008000 if ARCH_MX5 ||\
1613 default 0xa0008000 if ARCH_IOP32X ||\
1616 default 0xc0008000 if ARCH_LH7A40X ||\
1618 default 0xf0008000 if ARCH_AAEC2000 ||\
1620 default 0xc0028000 if ARCH_CLPS711X
1621 default 0x70008000 if ARCH_AT91 && (ARCH_AT91CAP9 || ARCH_AT91SAM9G45)
1622 default 0x20008000 if ARCH_AT91 && !(ARCH_AT91CAP9 || ARCH_AT91SAM9G45)
1623 default 0xc0008000 if ARCH_DAVINCI && ARCH_DAVINCI_DA8XX
1624 default 0x80008000 if ARCH_DAVINCI && !ARCH_DAVINCI_DA8XX
1625 default 0x00008000 if ARCH_EP93XX && EP93XX_SDCE3_SYNC_PHYS_OFFSET
1626 default 0xc0008000 if ARCH_EP93XX && EP93XX_SDCE0_PHYS_OFFSET
1627 default 0xd0008000 if ARCH_EP93XX && EP93XX_SDCE1_PHYS_OFFSET
1628 default 0xe0008000 if ARCH_EP93XX && EP93XX_SDCE2_PHYS_OFFSET
1629 default 0xf0008000 if ARCH_EP93XX && EP93XX_SDCE3_ASYNC_PHYS_OFFSET
1630 default 0x00008000 if ARCH_GEMINI && GEMINI_MEM_SWAP
1631 default 0x10008000 if ARCH_GEMINI && !GEMINI_MEM_SWAP
1632 default 0x70008000 if ARCH_REALVIEW && REALVIEW_HIGH_PHYS_OFFSET
1633 default 0x00008000 if ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET
1634 default 0xc0208000 if ARCH_SA1100 && SA1111
1635 default 0xc0008000 if ARCH_SA1100 && !SA1111
1636 default 0x30108000 if ARCH_S3C2410 && PM_H1940
1637 default 0x28E08000 if ARCH_U300 && MACH_U300_SINGLE_RAM
1638 default 0x48008000 if ARCH_U300 && !MACH_U300_SINGLE_RAM
1640 ZRELADDR is the physical address where the decompressed kernel
1641 image will be placed. ZRELADDR has to be specified when the
1642 assumption of AUTO_ZRELADDR is not valid, or when ZBOOT_ROM is
1647 menu "CPU Power Management"
1651 source "drivers/cpufreq/Kconfig"
1653 config CPU_FREQ_SA1100
1656 config CPU_FREQ_SA1110
1659 config CPU_FREQ_INTEGRATOR
1660 tristate "CPUfreq driver for ARM Integrator CPUs"
1661 depends on ARCH_INTEGRATOR && CPU_FREQ
1664 This enables the CPUfreq driver for ARM Integrator CPUs.
1666 For details, take a look at <file:Documentation/cpu-freq>.
1672 depends on CPU_FREQ && ARCH_PXA && PXA25x
1674 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1676 config CPU_FREQ_S3C64XX
1677 bool "CPUfreq support for Samsung S3C64XX CPUs"
1678 depends on CPU_FREQ && CPU_S3C6410
1683 Internal configuration node for common cpufreq on Samsung SoC
1685 config CPU_FREQ_S3C24XX
1686 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1687 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1690 This enables the CPUfreq driver for the Samsung S3C24XX family
1693 For details, take a look at <file:Documentation/cpu-freq>.
1697 config CPU_FREQ_S3C24XX_PLL
1698 bool "Support CPUfreq changing of PLL frequency"
1699 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1701 Compile in support for changing the PLL frequency from the
1702 S3C24XX series CPUfreq driver. The PLL takes time to settle
1703 after a frequency change, so by default it is not enabled.
1705 This also means that the PLL tables for the selected CPU(s) will
1706 be built which may increase the size of the kernel image.
1708 config CPU_FREQ_S3C24XX_DEBUG
1709 bool "Debug CPUfreq Samsung driver core"
1710 depends on CPU_FREQ_S3C24XX
1712 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1714 config CPU_FREQ_S3C24XX_IODEBUG
1715 bool "Debug CPUfreq Samsung driver IO timing"
1716 depends on CPU_FREQ_S3C24XX
1718 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1720 config CPU_FREQ_S3C24XX_DEBUGFS
1721 bool "Export debugfs for CPUFreq"
1722 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1724 Export status information via debugfs.
1728 source "drivers/cpuidle/Kconfig"
1732 menu "Floating point emulation"
1734 comment "At least one emulation must be selected"
1737 bool "NWFPE math emulation"
1738 depends on !AEABI || OABI_COMPAT
1740 Say Y to include the NWFPE floating point emulator in the kernel.
1741 This is necessary to run most binaries. Linux does not currently
1742 support floating point hardware so you need to say Y here even if
1743 your machine has an FPA or floating point co-processor podule.
1745 You may say N here if you are going to load the Acorn FPEmulator
1746 early in the bootup.
1749 bool "Support extended precision"
1750 depends on FPE_NWFPE
1752 Say Y to include 80-bit support in the kernel floating-point
1753 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1754 Note that gcc does not generate 80-bit operations by default,
1755 so in most cases this option only enlarges the size of the
1756 floating point emulator without any good reason.
1758 You almost surely want to say N here.
1761 bool "FastFPE math emulation (EXPERIMENTAL)"
1762 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1764 Say Y here to include the FAST floating point emulator in the kernel.
1765 This is an experimental much faster emulator which now also has full
1766 precision for the mantissa. It does not support any exceptions.
1767 It is very simple, and approximately 3-6 times faster than NWFPE.
1769 It should be sufficient for most programs. It may be not suitable
1770 for scientific calculations, but you have to check this for yourself.
1771 If you do not feel you need a faster FP emulation you should better
1775 bool "VFP-format floating point maths"
1776 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1778 Say Y to include VFP support code in the kernel. This is needed
1779 if your hardware includes a VFP unit.
1781 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1782 release notes and additional status information.
1784 Say N if your target does not have VFP hardware.
1792 bool "Advanced SIMD (NEON) Extension support"
1793 depends on VFPv3 && CPU_V7
1795 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1800 menu "Userspace binary formats"
1802 source "fs/Kconfig.binfmt"
1805 tristate "RISC OS personality"
1808 Say Y here to include the kernel code necessary if you want to run
1809 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1810 experimental; if this sounds frightening, say N and sleep in peace.
1811 You can also say M here to compile this support as a module (which
1812 will be called arthur).
1816 menu "Power management options"
1818 source "kernel/power/Kconfig"
1820 config ARCH_SUSPEND_POSSIBLE
1825 source "net/Kconfig"
1827 source "drivers/Kconfig"
1831 source "arch/arm/Kconfig.debug"
1833 source "security/Kconfig"
1835 source "crypto/Kconfig"
1837 source "lib/Kconfig"