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_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
23 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
24 select HAVE_GENERIC_DMA_COHERENT
25 select HAVE_KERNEL_GZIP
26 select HAVE_KERNEL_LZO
27 select HAVE_KERNEL_LZMA
29 select HAVE_PERF_EVENTS
30 select PERF_USE_VMALLOC
31 select HAVE_REGS_AND_STACK_ACCESS_API
32 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V7))
34 The ARM series is a line of low-power-consumption RISC chip designs
35 licensed by ARM Ltd and targeted at embedded applications and
36 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
37 manufactured, but legacy ARM-based PC hardware remains popular in
38 Europe. There is an ARM Linux project with a web page at
39 <http://www.arm.linux.org.uk/>.
44 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 ARCH_HAS_CPU_IDLE_WAIT
155 config GENERIC_HWEIGHT
159 config GENERIC_CALIBRATE_DELAY
163 config ARCH_MAY_HAVE_PC_FDC
169 config NEED_DMA_MAP_STATE
172 config GENERIC_ISA_DMA
181 config GENERIC_HARDIRQS_NO__DO_IRQ
184 config ARM_L1_CACHE_SHIFT_6
187 Setting ARM L1 cache line size to 64 Bytes.
191 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
192 default DRAM_BASE if REMAP_VECTORS_TO_RAM
195 The base address of exception vectors.
197 source "init/Kconfig"
199 source "kernel/Kconfig.freezer"
204 bool "MMU-based Paged Memory Management Support"
207 Select if you want MMU-based virtualised addressing space
208 support by paged memory management. If unsure, say 'Y'.
211 # The "ARM system type" choice list is ordered alphabetically by option
212 # text. Please add new entries in the option alphabetic order.
215 prompt "ARM system type"
216 default ARCH_VERSATILE
219 bool "Agilent AAEC-2000 based"
223 select ARCH_USES_GETTIMEOFFSET
225 This enables support for systems based on the Agilent AAEC-2000
227 config ARCH_INTEGRATOR
228 bool "ARM Ltd. Integrator family"
230 select ARCH_HAS_CPUFREQ
233 select GENERIC_CLOCKEVENTS
234 select PLAT_VERSATILE
236 Support for ARM's Integrator platform.
239 bool "ARM Ltd. RealView family"
243 select GENERIC_CLOCKEVENTS
244 select ARCH_WANT_OPTIONAL_GPIOLIB
245 select PLAT_VERSATILE
246 select ARM_TIMER_SP804
247 select GPIO_PL061 if GPIOLIB
249 This enables support for ARM Ltd RealView boards.
251 config ARCH_VERSATILE
252 bool "ARM Ltd. Versatile family"
257 select GENERIC_CLOCKEVENTS
258 select ARCH_WANT_OPTIONAL_GPIOLIB
259 select PLAT_VERSATILE
260 select ARM_TIMER_SP804
262 This enables support for ARM Ltd Versatile board.
265 bool "ARM Ltd. Versatile Express family"
266 select ARCH_WANT_OPTIONAL_GPIOLIB
268 select ARM_TIMER_SP804
270 select GENERIC_CLOCKEVENTS
273 select PLAT_VERSATILE
275 This enables support for the ARM Ltd Versatile Express boards.
279 select ARCH_REQUIRE_GPIOLIB
282 This enables support for systems based on the Atmel AT91RM9200,
283 AT91SAM9 and AT91CAP9 processors.
286 bool "Broadcom BCMRING"
291 select GENERIC_CLOCKEVENTS
292 select ARCH_WANT_OPTIONAL_GPIOLIB
294 Support for Broadcom's BCMRing platform.
297 bool "Cirrus Logic CLPS711x/EP721x-based"
299 select ARCH_USES_GETTIMEOFFSET
301 Support for Cirrus Logic 711x/721x based boards.
304 bool "Cavium Networks CNS3XXX family"
306 select GENERIC_CLOCKEVENTS
308 select PCI_DOMAINS if PCI
310 Support for Cavium Networks CNS3XXX platform.
313 bool "Cortina Systems Gemini"
315 select ARCH_REQUIRE_GPIOLIB
316 select ARCH_USES_GETTIMEOFFSET
318 Support for the Cortina Systems Gemini family SoCs
325 select ARCH_USES_GETTIMEOFFSET
327 This is an evaluation board for the StrongARM processor available
328 from Digital. It has limited hardware on-board, including an
329 Ethernet interface, two PCMCIA sockets, two serial ports and a
338 select ARCH_REQUIRE_GPIOLIB
339 select ARCH_HAS_HOLES_MEMORYMODEL
340 select ARCH_USES_GETTIMEOFFSET
342 This enables support for the Cirrus EP93xx series of CPUs.
344 config ARCH_FOOTBRIDGE
348 select ARCH_USES_GETTIMEOFFSET
350 Support for systems based on the DC21285 companion chip
351 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
354 bool "Freescale MXC/iMX-based"
355 select GENERIC_CLOCKEVENTS
356 select ARCH_REQUIRE_GPIOLIB
359 Support for Freescale MXC/iMX-based family of processors
362 bool "Freescale STMP3xxx"
365 select ARCH_REQUIRE_GPIOLIB
366 select GENERIC_CLOCKEVENTS
367 select USB_ARCH_HAS_EHCI
369 Support for systems based on the Freescale 3xxx CPUs.
372 bool "Hilscher NetX based"
375 select GENERIC_CLOCKEVENTS
377 This enables support for systems based on the Hilscher NetX Soc
380 bool "Hynix HMS720x-based"
383 select ARCH_USES_GETTIMEOFFSET
385 This enables support for systems based on the Hynix HMS720x
393 select ARCH_SUPPORTS_MSI
396 Support for Intel's IOP13XX (XScale) family of processors.
404 select ARCH_REQUIRE_GPIOLIB
406 Support for Intel's 80219 and IOP32X (XScale) family of
415 select ARCH_REQUIRE_GPIOLIB
417 Support for Intel's IOP33X (XScale) family of processors.
424 select ARCH_USES_GETTIMEOFFSET
426 Support for Intel's IXP23xx (XScale) family of processors.
429 bool "IXP2400/2800-based"
433 select ARCH_USES_GETTIMEOFFSET
435 Support for Intel's IXP2400/2800 (XScale) family of processors.
442 select GENERIC_CLOCKEVENTS
443 select DMABOUNCE if PCI
445 Support for Intel's IXP4XX (XScale) family of processors.
450 select ARCH_REQUIRE_GPIOLIB
451 select GENERIC_CLOCKEVENTS
454 Support for the Marvell Dove SoC 88AP510
457 bool "Marvell Kirkwood"
460 select ARCH_REQUIRE_GPIOLIB
461 select GENERIC_CLOCKEVENTS
464 Support for the following Marvell Kirkwood series SoCs:
465 88F6180, 88F6192 and 88F6281.
468 bool "Marvell Loki (88RC8480)"
470 select GENERIC_CLOCKEVENTS
473 Support for the Marvell Loki (88RC8480) SoC.
478 select ARCH_REQUIRE_GPIOLIB
481 select USB_ARCH_HAS_OHCI
484 select GENERIC_CLOCKEVENTS
486 Support for the NXP LPC32XX family of processors
489 bool "Marvell MV78xx0"
492 select ARCH_REQUIRE_GPIOLIB
493 select GENERIC_CLOCKEVENTS
496 Support for the following Marvell MV78xx0 series SoCs:
504 select ARCH_REQUIRE_GPIOLIB
505 select GENERIC_CLOCKEVENTS
508 Support for the following Marvell Orion 5x series SoCs:
509 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
510 Orion-2 (5281), Orion-1-90 (6183).
513 bool "Marvell PXA168/910/MMP2"
515 select ARCH_REQUIRE_GPIOLIB
517 select GENERIC_CLOCKEVENTS
522 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
525 bool "Micrel/Kendin KS8695"
527 select ARCH_REQUIRE_GPIOLIB
528 select ARCH_USES_GETTIMEOFFSET
530 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
531 System-on-Chip devices.
534 bool "NetSilicon NS9xxx"
537 select GENERIC_CLOCKEVENTS
540 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
543 <http://www.digi.com/products/microprocessors/index.jsp>
546 bool "Nuvoton W90X900 CPU"
548 select ARCH_REQUIRE_GPIOLIB
550 select GENERIC_CLOCKEVENTS
552 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
553 At present, the w90x900 has been renamed nuc900, regarding
554 the ARM series product line, you can login the following
555 link address to know more.
557 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
558 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
561 bool "Nuvoton NUC93X CPU"
565 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
566 low-power and high performance MPEG-4/JPEG multimedia controller chip.
571 select GENERIC_CLOCKEVENTS
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
601 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
606 select GENERIC_CLOCKEVENTS
607 select ARCH_REQUIRE_GPIOLIB
609 Support for Qualcomm MSM/QSD based systems. This runs on the
610 apps processor of the MSM/QSD and depends on a shared memory
611 interface to the modem processor which runs the baseband
612 stack and controls some vital subsystems
613 (clock and power control, etc).
616 bool "Renesas SH-Mobile"
618 Support for Renesas's SH-Mobile ARM platforms
625 select ARCH_MAY_HAVE_PC_FDC
626 select HAVE_PATA_PLATFORM
629 select ARCH_SPARSEMEM_ENABLE
630 select ARCH_USES_GETTIMEOFFSET
632 On the Acorn Risc-PC, Linux can support the internal IDE disk and
633 CD-ROM interface, serial and parallel port, and the floppy drive.
639 select ARCH_SPARSEMEM_ENABLE
641 select ARCH_HAS_CPUFREQ
643 select GENERIC_CLOCKEVENTS
646 select ARCH_REQUIRE_GPIOLIB
648 Support for StrongARM 11x0 based boards.
651 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
653 select ARCH_HAS_CPUFREQ
655 select ARCH_USES_GETTIMEOFFSET
656 select HAVE_S3C2410_I2C
658 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
659 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
660 the Samsung SMDK2410 development board (and derivatives).
662 Note, the S3C2416 and the S3C2450 are so close that they even share
663 the same SoC ID code. This means that there is no seperate machine
664 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
667 bool "Samsung S3C64XX"
673 select ARCH_USES_GETTIMEOFFSET
674 select ARCH_HAS_CPUFREQ
675 select ARCH_REQUIRE_GPIOLIB
676 select SAMSUNG_CLKSRC
677 select SAMSUNG_IRQ_VIC_TIMER
678 select SAMSUNG_IRQ_UART
679 select S3C_GPIO_TRACK
680 select S3C_GPIO_PULL_UPDOWN
681 select S3C_GPIO_CFG_S3C24XX
682 select S3C_GPIO_CFG_S3C64XX
684 select USB_ARCH_HAS_OHCI
685 select SAMSUNG_GPIOLIB_4BIT
686 select HAVE_S3C2410_I2C
687 select HAVE_S3C2410_WATCHDOG
689 Samsung S3C64XX series based systems
692 bool "Samsung S5P6440 S5P6450"
696 select HAVE_S3C2410_WATCHDOG
697 select ARCH_USES_GETTIMEOFFSET
698 select HAVE_S3C2410_I2C
701 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
705 bool "Samsung S5P6442"
709 select ARCH_USES_GETTIMEOFFSET
710 select HAVE_S3C2410_WATCHDOG
712 Samsung S5P6442 CPU based systems
715 bool "Samsung S5PC100"
719 select ARM_L1_CACHE_SHIFT_6
720 select ARCH_USES_GETTIMEOFFSET
721 select HAVE_S3C2410_I2C
723 select HAVE_S3C2410_WATCHDOG
725 Samsung S5PC100 series based systems
728 bool "Samsung S5PV210/S5PC110"
730 select ARCH_SPARSEMEM_ENABLE
733 select ARM_L1_CACHE_SHIFT_6
734 select ARCH_HAS_CPUFREQ
735 select ARCH_USES_GETTIMEOFFSET
736 select HAVE_S3C2410_I2C
738 select HAVE_S3C2410_WATCHDOG
740 Samsung S5PV210/S5PC110 series based systems
743 bool "Samsung S5PV310/S5PC210"
745 select ARCH_SPARSEMEM_ENABLE
748 select GENERIC_CLOCKEVENTS
750 select HAVE_S3C2410_I2C
751 select HAVE_S3C2410_WATCHDOG
753 Samsung S5PV310 series based systems
762 select ARCH_USES_GETTIMEOFFSET
764 Support for the StrongARM based Digital DNARD machine, also known
765 as "Shark" (<http://www.shark-linux.de/shark.html>).
768 bool "Telechips TCC ARM926-based systems"
772 select GENERIC_CLOCKEVENTS
774 Support for Telechips TCC ARM926-based systems.
779 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
780 select ARCH_USES_GETTIMEOFFSET
782 Say Y here for systems based on one of the Sharp LH7A40X
783 System on a Chip processors. These CPUs include an ARM922T
784 core with a wide array of integrated devices for
785 hand-held and low-power applications.
788 bool "ST-Ericsson U300 Series"
794 select GENERIC_CLOCKEVENTS
798 Support for ST-Ericsson U300 series mobile platforms.
801 bool "ST-Ericsson U8500 Series"
804 select GENERIC_CLOCKEVENTS
806 select ARCH_REQUIRE_GPIOLIB
808 Support for ST-Ericsson's Ux500 architecture
811 bool "STMicroelectronics Nomadik"
816 select GENERIC_CLOCKEVENTS
817 select ARCH_REQUIRE_GPIOLIB
819 Support for the Nomadik platform by ST-Ericsson
823 select GENERIC_CLOCKEVENTS
824 select ARCH_REQUIRE_GPIOLIB
828 select GENERIC_ALLOCATOR
829 select ARCH_HAS_HOLES_MEMORYMODEL
831 Support for TI's DaVinci platform.
836 select ARCH_REQUIRE_GPIOLIB
837 select ARCH_HAS_CPUFREQ
838 select GENERIC_CLOCKEVENTS
839 select ARCH_HAS_HOLES_MEMORYMODEL
841 Support for TI's OMAP platform (OMAP1/2/3/4).
846 select ARCH_REQUIRE_GPIOLIB
848 select GENERIC_CLOCKEVENTS
851 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
856 # This is sorted alphabetically by mach-* pathname. However, plat-*
857 # Kconfigs may be included either alphabetically (according to the
858 # plat- suffix) or along side the corresponding mach-* source.
860 source "arch/arm/mach-aaec2000/Kconfig"
862 source "arch/arm/mach-at91/Kconfig"
864 source "arch/arm/mach-bcmring/Kconfig"
866 source "arch/arm/mach-clps711x/Kconfig"
868 source "arch/arm/mach-cns3xxx/Kconfig"
870 source "arch/arm/mach-davinci/Kconfig"
872 source "arch/arm/mach-dove/Kconfig"
874 source "arch/arm/mach-ep93xx/Kconfig"
876 source "arch/arm/mach-footbridge/Kconfig"
878 source "arch/arm/mach-gemini/Kconfig"
880 source "arch/arm/mach-h720x/Kconfig"
882 source "arch/arm/mach-integrator/Kconfig"
884 source "arch/arm/mach-iop32x/Kconfig"
886 source "arch/arm/mach-iop33x/Kconfig"
888 source "arch/arm/mach-iop13xx/Kconfig"
890 source "arch/arm/mach-ixp4xx/Kconfig"
892 source "arch/arm/mach-ixp2000/Kconfig"
894 source "arch/arm/mach-ixp23xx/Kconfig"
896 source "arch/arm/mach-kirkwood/Kconfig"
898 source "arch/arm/mach-ks8695/Kconfig"
900 source "arch/arm/mach-lh7a40x/Kconfig"
902 source "arch/arm/mach-loki/Kconfig"
904 source "arch/arm/mach-lpc32xx/Kconfig"
906 source "arch/arm/mach-msm/Kconfig"
908 source "arch/arm/mach-mv78xx0/Kconfig"
910 source "arch/arm/plat-mxc/Kconfig"
912 source "arch/arm/mach-netx/Kconfig"
914 source "arch/arm/mach-nomadik/Kconfig"
915 source "arch/arm/plat-nomadik/Kconfig"
917 source "arch/arm/mach-ns9xxx/Kconfig"
919 source "arch/arm/mach-nuc93x/Kconfig"
921 source "arch/arm/plat-omap/Kconfig"
923 source "arch/arm/mach-omap1/Kconfig"
925 source "arch/arm/mach-omap2/Kconfig"
927 source "arch/arm/mach-orion5x/Kconfig"
929 source "arch/arm/mach-pxa/Kconfig"
930 source "arch/arm/plat-pxa/Kconfig"
932 source "arch/arm/mach-mmp/Kconfig"
934 source "arch/arm/mach-realview/Kconfig"
936 source "arch/arm/mach-sa1100/Kconfig"
938 source "arch/arm/plat-samsung/Kconfig"
939 source "arch/arm/plat-s3c24xx/Kconfig"
940 source "arch/arm/plat-s5p/Kconfig"
942 source "arch/arm/plat-spear/Kconfig"
944 source "arch/arm/plat-tcc/Kconfig"
947 source "arch/arm/mach-s3c2400/Kconfig"
948 source "arch/arm/mach-s3c2410/Kconfig"
949 source "arch/arm/mach-s3c2412/Kconfig"
950 source "arch/arm/mach-s3c2416/Kconfig"
951 source "arch/arm/mach-s3c2440/Kconfig"
952 source "arch/arm/mach-s3c2443/Kconfig"
956 source "arch/arm/mach-s3c64xx/Kconfig"
959 source "arch/arm/mach-s5p64x0/Kconfig"
961 source "arch/arm/mach-s5p6442/Kconfig"
963 source "arch/arm/mach-s5pc100/Kconfig"
965 source "arch/arm/mach-s5pv210/Kconfig"
967 source "arch/arm/mach-s5pv310/Kconfig"
969 source "arch/arm/mach-shmobile/Kconfig"
971 source "arch/arm/plat-stmp3xxx/Kconfig"
973 source "arch/arm/mach-tegra/Kconfig"
975 source "arch/arm/mach-u300/Kconfig"
977 source "arch/arm/mach-ux500/Kconfig"
979 source "arch/arm/mach-versatile/Kconfig"
981 source "arch/arm/mach-vexpress/Kconfig"
983 source "arch/arm/mach-w90x900/Kconfig"
985 # Definitions to make life easier
991 select GENERIC_CLOCKEVENTS
999 config PLAT_VERSATILE
1002 config ARM_TIMER_SP804
1005 source arch/arm/mm/Kconfig
1008 bool "Enable iWMMXt support"
1009 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
1010 default y if PXA27x || PXA3xx || ARCH_MMP
1012 Enable support for iWMMXt context switching at run time if
1013 running on a CPU that supports it.
1015 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
1018 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
1022 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
1023 (!ARCH_OMAP3 || OMAP3_EMU)
1028 source "arch/arm/Kconfig-nommu"
1031 config ARM_ERRATA_411920
1032 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1035 Invalidation of the Instruction Cache operation can
1036 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1037 It does not affect the MPCore. This option enables the ARM Ltd.
1038 recommended workaround.
1040 config ARM_ERRATA_430973
1041 bool "ARM errata: Stale prediction on replaced interworking branch"
1044 This option enables the workaround for the 430973 Cortex-A8
1045 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1046 interworking branch is replaced with another code sequence at the
1047 same virtual address, whether due to self-modifying code or virtual
1048 to physical address re-mapping, Cortex-A8 does not recover from the
1049 stale interworking branch prediction. This results in Cortex-A8
1050 executing the new code sequence in the incorrect ARM or Thumb state.
1051 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1052 and also flushes the branch target cache at every context switch.
1053 Note that setting specific bits in the ACTLR register may not be
1054 available in non-secure mode.
1056 config ARM_ERRATA_458693
1057 bool "ARM errata: Processor deadlock when a false hazard is created"
1060 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1061 erratum. For very specific sequences of memory operations, it is
1062 possible for a hazard condition intended for a cache line to instead
1063 be incorrectly associated with a different cache line. This false
1064 hazard might then cause a processor deadlock. The workaround enables
1065 the L1 caching of the NEON accesses and disables the PLD instruction
1066 in the ACTLR register. Note that setting specific bits in the ACTLR
1067 register may not be available in non-secure mode.
1069 config ARM_ERRATA_460075
1070 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1073 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1074 erratum. Any asynchronous access to the L2 cache may encounter a
1075 situation in which recent store transactions to the L2 cache are lost
1076 and overwritten with stale memory contents from external memory. The
1077 workaround disables the write-allocate mode for the L2 cache via the
1078 ACTLR register. Note that setting specific bits in the ACTLR register
1079 may not be available in non-secure mode.
1081 config ARM_ERRATA_742230
1082 bool "ARM errata: DMB operation may be faulty"
1083 depends on CPU_V7 && SMP
1085 This option enables the workaround for the 742230 Cortex-A9
1086 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1087 between two write operations may not ensure the correct visibility
1088 ordering of the two writes. This workaround sets a specific bit in
1089 the diagnostic register of the Cortex-A9 which causes the DMB
1090 instruction to behave as a DSB, ensuring the correct behaviour of
1093 config ARM_ERRATA_742231
1094 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1095 depends on CPU_V7 && SMP
1097 This option enables the workaround for the 742231 Cortex-A9
1098 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1099 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1100 accessing some data located in the same cache line, may get corrupted
1101 data due to bad handling of the address hazard when the line gets
1102 replaced from one of the CPUs at the same time as another CPU is
1103 accessing it. This workaround sets specific bits in the diagnostic
1104 register of the Cortex-A9 which reduces the linefill issuing
1105 capabilities of the processor.
1107 config PL310_ERRATA_588369
1108 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1109 depends on CACHE_L2X0 && ARCH_OMAP4
1111 The PL310 L2 cache controller implements three types of Clean &
1112 Invalidate maintenance operations: by Physical Address
1113 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1114 They are architecturally defined to behave as the execution of a
1115 clean operation followed immediately by an invalidate operation,
1116 both performing to the same memory location. This functionality
1117 is not correctly implemented in PL310 as clean lines are not
1118 invalidated as a result of these operations. Note that this errata
1119 uses Texas Instrument's secure monitor api.
1121 config ARM_ERRATA_720789
1122 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1123 depends on CPU_V7 && SMP
1125 This option enables the workaround for the 720789 Cortex-A9 (prior to
1126 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1127 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1128 As a consequence of this erratum, some TLB entries which should be
1129 invalidated are not, resulting in an incoherency in the system page
1130 tables. The workaround changes the TLB flushing routines to invalidate
1131 entries regardless of the ASID.
1133 config ARM_ERRATA_743622
1134 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1137 This option enables the workaround for the 743622 Cortex-A9
1138 (r2p0..r2p2) erratum. Under very rare conditions, a faulty
1139 optimisation in the Cortex-A9 Store Buffer may lead to data
1140 corruption. This workaround sets a specific bit in the diagnostic
1141 register of the Cortex-A9 which disables the Store Buffer
1142 optimisation, preventing the defect from occurring. This has no
1143 visible impact on the overall performance or power consumption of the
1148 source "arch/arm/common/Kconfig"
1158 Find out whether you have ISA slots on your motherboard. ISA is the
1159 name of a bus system, i.e. the way the CPU talks to the other stuff
1160 inside your box. Other bus systems are PCI, EISA, MicroChannel
1161 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1162 newer boards don't support it. If you have ISA, say Y, otherwise N.
1164 # Select ISA DMA controller support
1169 # Select ISA DMA interface
1174 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE || ARCH_CNS3XXX
1176 Find out whether you have a PCI motherboard. PCI is the name of a
1177 bus system, i.e. the way the CPU talks to the other stuff inside
1178 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1179 VESA. If you have PCI, say Y, otherwise N.
1188 # Select the host bridge type
1189 config PCI_HOST_VIA82C505
1191 depends on PCI && ARCH_SHARK
1194 config PCI_HOST_ITE8152
1196 depends on PCI && MACH_ARMCORE
1200 source "drivers/pci/Kconfig"
1202 source "drivers/pcmcia/Kconfig"
1206 menu "Kernel Features"
1208 source "kernel/time/Kconfig"
1211 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1212 depends on EXPERIMENTAL
1213 depends on GENERIC_CLOCKEVENTS
1214 depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
1215 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1216 ARCH_S5PV310 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4
1217 select USE_GENERIC_SMP_HELPERS
1220 This enables support for systems with more than one CPU. If you have
1221 a system with only one CPU, like most personal computers, say N. If
1222 you have a system with more than one CPU, say Y.
1224 If you say N here, the kernel will run on single and multiprocessor
1225 machines, but will use only one CPU of a multiprocessor machine. If
1226 you say Y here, the kernel will run on many, but not all, single
1227 processor machines. On a single processor machine, the kernel will
1228 run faster if you say N here.
1230 See also <file:Documentation/i386/IO-APIC.txt>,
1231 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1232 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1234 If you don't know what to do here, say N.
1237 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1238 depends on EXPERIMENTAL
1239 depends on SMP && !XIP && !THUMB2_KERNEL
1242 SMP kernels contain instructions which fail on non-SMP processors.
1243 Enabling this option allows the kernel to modify itself to make
1244 these instructions safe. Disabling it allows about 1K of space
1247 If you don't know what to do here, say Y.
1253 This option enables support for the ARM system coherency unit
1259 This options enables support for the ARM timer and watchdog unit
1262 prompt "Memory split"
1265 Select the desired split between kernel and user memory.
1267 If you are not absolutely sure what you are doing, leave this
1271 bool "3G/1G user/kernel split"
1273 bool "2G/2G user/kernel split"
1275 bool "1G/3G user/kernel split"
1280 default 0x40000000 if VMSPLIT_1G
1281 default 0x80000000 if VMSPLIT_2G
1285 int "Maximum number of CPUs (2-32)"
1291 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1292 depends on SMP && HOTPLUG && EXPERIMENTAL
1294 Say Y here to experiment with turning CPUs off and on. CPUs
1295 can be controlled through /sys/devices/system/cpu.
1298 bool "Use local timer interrupts"
1303 Enable support for local timers on SMP platforms, rather then the
1304 legacy IPI broadcast method. Local timers allows the system
1305 accounting to be spread across the timer interval, preventing a
1306 "thundering herd" at every timer tick.
1308 source kernel/Kconfig.preempt
1312 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
1313 ARCH_S5P6442 || ARCH_S5PV210 || ARCH_S5PV310
1314 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1315 default AT91_TIMER_HZ if ARCH_AT91
1316 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1319 config THUMB2_KERNEL
1320 bool "Compile the kernel in Thumb-2 mode"
1321 depends on CPU_V7 && EXPERIMENTAL
1323 select ARM_ASM_UNIFIED
1325 By enabling this option, the kernel will be compiled in
1326 Thumb-2 mode. A compiler/assembler that understand the unified
1327 ARM-Thumb syntax is needed.
1331 config ARM_ASM_UNIFIED
1335 bool "Use the ARM EABI to compile the kernel"
1337 This option allows for the kernel to be compiled using the latest
1338 ARM ABI (aka EABI). This is only useful if you are using a user
1339 space environment that is also compiled with EABI.
1341 Since there are major incompatibilities between the legacy ABI and
1342 EABI, especially with regard to structure member alignment, this
1343 option also changes the kernel syscall calling convention to
1344 disambiguate both ABIs and allow for backward compatibility support
1345 (selected with CONFIG_OABI_COMPAT).
1347 To use this you need GCC version 4.0.0 or later.
1350 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1351 depends on AEABI && EXPERIMENTAL
1354 This option preserves the old syscall interface along with the
1355 new (ARM EABI) one. It also provides a compatibility layer to
1356 intercept syscalls that have structure arguments which layout
1357 in memory differs between the legacy ABI and the new ARM EABI
1358 (only for non "thumb" binaries). This option adds a tiny
1359 overhead to all syscalls and produces a slightly larger kernel.
1360 If you know you'll be using only pure EABI user space then you
1361 can say N here. If this option is not selected and you attempt
1362 to execute a legacy ABI binary then the result will be
1363 UNPREDICTABLE (in fact it can be predicted that it won't work
1364 at all). If in doubt say Y.
1366 config ARCH_HAS_HOLES_MEMORYMODEL
1369 config ARCH_SPARSEMEM_ENABLE
1372 config ARCH_SPARSEMEM_DEFAULT
1373 def_bool ARCH_SPARSEMEM_ENABLE
1375 config ARCH_SELECT_MEMORY_MODEL
1376 def_bool ARCH_SPARSEMEM_ENABLE
1379 bool "High Memory Support (EXPERIMENTAL)"
1380 depends on MMU && EXPERIMENTAL
1382 The address space of ARM processors is only 4 Gigabytes large
1383 and it has to accommodate user address space, kernel address
1384 space as well as some memory mapped IO. That means that, if you
1385 have a large amount of physical memory and/or IO, not all of the
1386 memory can be "permanently mapped" by the kernel. The physical
1387 memory that is not permanently mapped is called "high memory".
1389 Depending on the selected kernel/user memory split, minimum
1390 vmalloc space and actual amount of RAM, you may not need this
1391 option which should result in a slightly faster kernel.
1396 bool "Allocate 2nd-level pagetables from highmem"
1398 depends on !OUTER_CACHE
1400 config HW_PERF_EVENTS
1401 bool "Enable hardware performance counter support for perf events"
1402 depends on PERF_EVENTS && CPU_HAS_PMU
1405 Enable hardware performance counter support for perf events. If
1406 disabled, perf events will use software events only.
1411 This enables support for sparse irqs. This is useful in general
1412 as most CPUs have a fairly sparse array of IRQ vectors, which
1413 the irq_desc then maps directly on to. Systems with a high
1414 number of off-chip IRQs will want to treat this as
1415 experimental until they have been independently verified.
1419 config FORCE_MAX_ZONEORDER
1420 int "Maximum zone order" if ARCH_SHMOBILE
1421 range 11 64 if ARCH_SHMOBILE
1422 default "9" if SA1111
1425 The kernel memory allocator divides physically contiguous memory
1426 blocks into "zones", where each zone is a power of two number of
1427 pages. This option selects the largest power of two that the kernel
1428 keeps in the memory allocator. If you need to allocate very large
1429 blocks of physically contiguous memory, then you may need to
1430 increase this value.
1432 This config option is actually maximum order plus one. For example,
1433 a value of 11 means that the largest free memory block is 2^10 pages.
1436 bool "Timer and CPU usage LEDs"
1437 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1438 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1439 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1440 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1441 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1442 ARCH_AT91 || ARCH_DAVINCI || \
1443 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1445 If you say Y here, the LEDs on your machine will be used
1446 to provide useful information about your current system status.
1448 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1449 be able to select which LEDs are active using the options below. If
1450 you are compiling a kernel for the EBSA-110 or the LART however, the
1451 red LED will simply flash regularly to indicate that the system is
1452 still functional. It is safe to say Y here if you have a CATS
1453 system, but the driver will do nothing.
1456 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1457 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1458 || MACH_OMAP_PERSEUS2
1460 depends on !GENERIC_CLOCKEVENTS
1461 default y if ARCH_EBSA110
1463 If you say Y here, one of the system LEDs (the green one on the
1464 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1465 will flash regularly to indicate that the system is still
1466 operational. This is mainly useful to kernel hackers who are
1467 debugging unstable kernels.
1469 The LART uses the same LED for both Timer LED and CPU usage LED
1470 functions. You may choose to use both, but the Timer LED function
1471 will overrule the CPU usage LED.
1474 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1476 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1477 || MACH_OMAP_PERSEUS2
1480 If you say Y here, the red LED will be used to give a good real
1481 time indication of CPU usage, by lighting whenever the idle task
1482 is not currently executing.
1484 The LART uses the same LED for both Timer LED and CPU usage LED
1485 functions. You may choose to use both, but the Timer LED function
1486 will overrule the CPU usage LED.
1488 config ALIGNMENT_TRAP
1490 depends on CPU_CP15_MMU
1491 default y if !ARCH_EBSA110
1492 select HAVE_PROC_CPU if PROC_FS
1494 ARM processors cannot fetch/store information which is not
1495 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1496 address divisible by 4. On 32-bit ARM processors, these non-aligned
1497 fetch/store instructions will be emulated in software if you say
1498 here, which has a severe performance impact. This is necessary for
1499 correct operation of some network protocols. With an IP-only
1500 configuration it is safe to say N, otherwise say Y.
1502 config UACCESS_WITH_MEMCPY
1503 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1504 depends on MMU && EXPERIMENTAL
1505 default y if CPU_FEROCEON
1507 Implement faster copy_to_user and clear_user methods for CPU
1508 cores where a 8-word STM instruction give significantly higher
1509 memory write throughput than a sequence of individual 32bit stores.
1511 A possible side effect is a slight increase in scheduling latency
1512 between threads sharing the same address space if they invoke
1513 such copy operations with large buffers.
1515 However, if the CPU data cache is using a write-allocate mode,
1516 this option is unlikely to provide any performance gain.
1520 prompt "Enable seccomp to safely compute untrusted bytecode"
1522 This kernel feature is useful for number crunching applications
1523 that may need to compute untrusted bytecode during their
1524 execution. By using pipes or other transports made available to
1525 the process as file descriptors supporting the read/write
1526 syscalls, it's possible to isolate those applications in
1527 their own address space using seccomp. Once seccomp is
1528 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1529 and the task is only allowed to execute a few safe syscalls
1530 defined by each seccomp mode.
1532 config CC_STACKPROTECTOR
1533 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1535 This option turns on the -fstack-protector GCC feature. This
1536 feature puts, at the beginning of functions, a canary value on
1537 the stack just before the return address, and validates
1538 the value just before actually returning. Stack based buffer
1539 overflows (that need to overwrite this return address) now also
1540 overwrite the canary, which gets detected and the attack is then
1541 neutralized via a kernel panic.
1542 This feature requires gcc version 4.2 or above.
1544 config DEPRECATED_PARAM_STRUCT
1545 bool "Provide old way to pass kernel parameters"
1547 This was deprecated in 2001 and announced to live on for 5 years.
1548 Some old boot loaders still use this way.
1554 # Compressed boot loader in ROM. Yes, we really want to ask about
1555 # TEXT and BSS so we preserve their values in the config files.
1556 config ZBOOT_ROM_TEXT
1557 hex "Compressed ROM boot loader base address"
1560 The physical address at which the ROM-able zImage is to be
1561 placed in the target. Platforms which normally make use of
1562 ROM-able zImage formats normally set this to a suitable
1563 value in their defconfig file.
1565 If ZBOOT_ROM is not enabled, this has no effect.
1567 config ZBOOT_ROM_BSS
1568 hex "Compressed ROM boot loader BSS address"
1571 The base address of an area of read/write memory in the target
1572 for the ROM-able zImage which must be available while the
1573 decompressor is running. It must be large enough to hold the
1574 entire decompressed kernel plus an additional 128 KiB.
1575 Platforms which normally make use of ROM-able zImage formats
1576 normally set this to a suitable value in their defconfig file.
1578 If ZBOOT_ROM is not enabled, this has no effect.
1581 bool "Compressed boot loader in ROM/flash"
1582 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1584 Say Y here if you intend to execute your compressed kernel image
1585 (zImage) directly from ROM or flash. If unsure, say N.
1588 string "Default kernel command string"
1591 On some architectures (EBSA110 and CATS), there is currently no way
1592 for the boot loader to pass arguments to the kernel. For these
1593 architectures, you should supply some command-line options at build
1594 time by entering them here. As a minimum, you should specify the
1595 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1597 config CMDLINE_FORCE
1598 bool "Always use the default kernel command string"
1599 depends on CMDLINE != ""
1601 Always use the default kernel command string, even if the boot
1602 loader passes other arguments to the kernel.
1603 This is useful if you cannot or don't want to change the
1604 command-line options your boot loader passes to the kernel.
1609 bool "Kernel Execute-In-Place from ROM"
1610 depends on !ZBOOT_ROM
1612 Execute-In-Place allows the kernel to run from non-volatile storage
1613 directly addressable by the CPU, such as NOR flash. This saves RAM
1614 space since the text section of the kernel is not loaded from flash
1615 to RAM. Read-write sections, such as the data section and stack,
1616 are still copied to RAM. The XIP kernel is not compressed since
1617 it has to run directly from flash, so it will take more space to
1618 store it. The flash address used to link the kernel object files,
1619 and for storing it, is configuration dependent. Therefore, if you
1620 say Y here, you must know the proper physical address where to
1621 store the kernel image depending on your own flash memory usage.
1623 Also note that the make target becomes "make xipImage" rather than
1624 "make zImage" or "make Image". The final kernel binary to put in
1625 ROM memory will be arch/arm/boot/xipImage.
1629 config XIP_PHYS_ADDR
1630 hex "XIP Kernel Physical Location"
1631 depends on XIP_KERNEL
1632 default "0x00080000"
1634 This is the physical address in your flash memory the kernel will
1635 be linked for and stored to. This address is dependent on your
1639 bool "Kexec system call (EXPERIMENTAL)"
1640 depends on EXPERIMENTAL
1642 kexec is a system call that implements the ability to shutdown your
1643 current kernel, and to start another kernel. It is like a reboot
1644 but it is independent of the system firmware. And like a reboot
1645 you can start any kernel with it, not just Linux.
1647 It is an ongoing process to be certain the hardware in a machine
1648 is properly shutdown, so do not be surprised if this code does not
1649 initially work for you. It may help to enable device hotplugging
1653 bool "Export atags in procfs"
1657 Should the atags used to boot the kernel be exported in an "atags"
1658 file in procfs. Useful with kexec.
1660 config AUTO_ZRELADDR
1661 bool "Auto calculation of the decompressed kernel image address"
1662 depends on !ZBOOT_ROM && !ARCH_U300
1664 ZRELADDR is the physical address where the decompressed kernel
1665 image will be placed. If AUTO_ZRELADDR is selected, the address
1666 will be determined at run-time by masking the current IP with
1667 0xf8000000. This assumes the zImage being placed in the first 128MB
1668 from start of memory.
1672 menu "CPU Power Management"
1676 source "drivers/cpufreq/Kconfig"
1679 tristate "CPUfreq driver for i.MX CPUs"
1680 depends on ARCH_MXC && CPU_FREQ
1682 This enables the CPUfreq driver for i.MX CPUs.
1684 config CPU_FREQ_SA1100
1687 config CPU_FREQ_SA1110
1690 config CPU_FREQ_INTEGRATOR
1691 tristate "CPUfreq driver for ARM Integrator CPUs"
1692 depends on ARCH_INTEGRATOR && CPU_FREQ
1695 This enables the CPUfreq driver for ARM Integrator CPUs.
1697 For details, take a look at <file:Documentation/cpu-freq>.
1703 depends on CPU_FREQ && ARCH_PXA && PXA25x
1705 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1707 config CPU_FREQ_S3C64XX
1708 bool "CPUfreq support for Samsung S3C64XX CPUs"
1709 depends on CPU_FREQ && CPU_S3C6410
1714 Internal configuration node for common cpufreq on Samsung SoC
1716 config CPU_FREQ_S3C24XX
1717 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1718 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1721 This enables the CPUfreq driver for the Samsung S3C24XX family
1724 For details, take a look at <file:Documentation/cpu-freq>.
1728 config CPU_FREQ_S3C24XX_PLL
1729 bool "Support CPUfreq changing of PLL frequency"
1730 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1732 Compile in support for changing the PLL frequency from the
1733 S3C24XX series CPUfreq driver. The PLL takes time to settle
1734 after a frequency change, so by default it is not enabled.
1736 This also means that the PLL tables for the selected CPU(s) will
1737 be built which may increase the size of the kernel image.
1739 config CPU_FREQ_S3C24XX_DEBUG
1740 bool "Debug CPUfreq Samsung driver core"
1741 depends on CPU_FREQ_S3C24XX
1743 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1745 config CPU_FREQ_S3C24XX_IODEBUG
1746 bool "Debug CPUfreq Samsung driver IO timing"
1747 depends on CPU_FREQ_S3C24XX
1749 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1751 config CPU_FREQ_S3C24XX_DEBUGFS
1752 bool "Export debugfs for CPUFreq"
1753 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1755 Export status information via debugfs.
1759 source "drivers/cpuidle/Kconfig"
1763 menu "Floating point emulation"
1765 comment "At least one emulation must be selected"
1768 bool "NWFPE math emulation"
1769 depends on !AEABI || OABI_COMPAT
1771 Say Y to include the NWFPE floating point emulator in the kernel.
1772 This is necessary to run most binaries. Linux does not currently
1773 support floating point hardware so you need to say Y here even if
1774 your machine has an FPA or floating point co-processor podule.
1776 You may say N here if you are going to load the Acorn FPEmulator
1777 early in the bootup.
1780 bool "Support extended precision"
1781 depends on FPE_NWFPE
1783 Say Y to include 80-bit support in the kernel floating-point
1784 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1785 Note that gcc does not generate 80-bit operations by default,
1786 so in most cases this option only enlarges the size of the
1787 floating point emulator without any good reason.
1789 You almost surely want to say N here.
1792 bool "FastFPE math emulation (EXPERIMENTAL)"
1793 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1795 Say Y here to include the FAST floating point emulator in the kernel.
1796 This is an experimental much faster emulator which now also has full
1797 precision for the mantissa. It does not support any exceptions.
1798 It is very simple, and approximately 3-6 times faster than NWFPE.
1800 It should be sufficient for most programs. It may be not suitable
1801 for scientific calculations, but you have to check this for yourself.
1802 If you do not feel you need a faster FP emulation you should better
1806 bool "VFP-format floating point maths"
1807 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1809 Say Y to include VFP support code in the kernel. This is needed
1810 if your hardware includes a VFP unit.
1812 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1813 release notes and additional status information.
1815 Say N if your target does not have VFP hardware.
1823 bool "Advanced SIMD (NEON) Extension support"
1824 depends on VFPv3 && CPU_V7
1826 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1831 menu "Userspace binary formats"
1833 source "fs/Kconfig.binfmt"
1836 tristate "RISC OS personality"
1839 Say Y here to include the kernel code necessary if you want to run
1840 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1841 experimental; if this sounds frightening, say N and sleep in peace.
1842 You can also say M here to compile this support as a module (which
1843 will be called arthur).
1847 menu "Power management options"
1849 source "kernel/power/Kconfig"
1851 config ARCH_SUSPEND_POSSIBLE
1856 source "net/Kconfig"
1858 source "drivers/Kconfig"
1862 source "arch/arm/Kconfig.debug"
1864 source "security/Kconfig"
1866 source "crypto/Kconfig"
1868 source "lib/Kconfig"