4 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
5 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
6 select ARCH_HAVE_CUSTOM_GPIO_H
7 select ARCH_SUPPORTS_ATOMIC_RMW
8 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
9 select ARCH_WANT_IPC_PARSE_VERSION
10 select BUILDTIME_EXTABLE_SORT if MMU
11 select CPU_PM if (SUSPEND || CPU_IDLE)
12 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
13 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
14 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
15 select GENERIC_IRQ_PROBE
16 select GENERIC_IRQ_SHOW
17 select GENERIC_PCI_IOMAP
18 select GENERIC_SMP_IDLE_THREAD
19 select GENERIC_IDLE_POLL_SETUP
20 select GENERIC_STRNCPY_FROM_USER
21 select GENERIC_STRNLEN_USER
22 select HARDIRQS_SW_RESEND
23 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
25 select HAVE_ARCH_SECCOMP_FILTER
26 select HAVE_ARCH_TRACEHOOK
28 select HAVE_C_RECORDMCOUNT
29 select HAVE_DEBUG_KMEMLEAK
30 select HAVE_DMA_API_DEBUG
32 select HAVE_DMA_CONTIGUOUS if MMU
33 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
34 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
35 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
36 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
37 select HAVE_GENERIC_DMA_COHERENT
38 select HAVE_GENERIC_HARDIRQS
39 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
40 select HAVE_IDE if PCI || ISA || PCMCIA
41 select HAVE_IRQ_TIME_ACCOUNTING
42 select HAVE_KERNEL_GZIP
43 select HAVE_KERNEL_LZMA
44 select HAVE_KERNEL_LZO
46 select HAVE_KPROBES if !XIP_KERNEL
47 select HAVE_KRETPROBES if (HAVE_KPROBES)
49 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
50 select HAVE_PERF_EVENTS
52 select HAVE_REGS_AND_STACK_ACCESS_API
53 select HAVE_SYSCALL_TRACEPOINTS
56 select PERF_USE_VMALLOC
58 select SYS_SUPPORTS_APM_EMULATION
59 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
60 select MODULES_USE_ELF_REL
61 select CLONE_BACKWARDS
62 select OLD_SIGSUSPEND3
64 select HAVE_CONTEXT_TRACKING
66 The ARM series is a line of low-power-consumption RISC chip designs
67 licensed by ARM Ltd and targeted at embedded applications and
68 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
69 manufactured, but legacy ARM-based PC hardware remains popular in
70 Europe. There is an ARM Linux project with a web page at
71 <http://www.arm.linux.org.uk/>.
73 config ARM_HAS_SG_CHAIN
76 config NEED_SG_DMA_LENGTH
79 config ARM_DMA_USE_IOMMU
81 select ARM_HAS_SG_CHAIN
82 select NEED_SG_DMA_LENGTH
86 config ARM_DMA_IOMMU_ALIGNMENT
87 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
91 DMA mapping framework by default aligns all buffers to the smallest
92 PAGE_SIZE order which is greater than or equal to the requested buffer
93 size. This works well for buffers up to a few hundreds kilobytes, but
94 for larger buffers it just a waste of address space. Drivers which has
95 relatively small addressing window (like 64Mib) might run out of
96 virtual space with just a few allocations.
98 With this parameter you can specify the maximum PAGE_SIZE order for
99 DMA IOMMU buffers. Larger buffers will be aligned only to this
100 specified order. The order is expressed as a power of two multiplied
108 config MIGHT_HAVE_PCI
111 config SYS_SUPPORTS_APM_EMULATION
116 select GENERIC_ALLOCATOR
127 The Extended Industry Standard Architecture (EISA) bus was
128 developed as an open alternative to the IBM MicroChannel bus.
130 The EISA bus provided some of the features of the IBM MicroChannel
131 bus while maintaining backward compatibility with cards made for
132 the older ISA bus. The EISA bus saw limited use between 1988 and
133 1995 when it was made obsolete by the PCI bus.
135 Say Y here if you are building a kernel for an EISA-based machine.
142 config STACKTRACE_SUPPORT
146 config HAVE_LATENCYTOP_SUPPORT
151 config LOCKDEP_SUPPORT
155 config TRACE_IRQFLAGS_SUPPORT
159 config RWSEM_GENERIC_SPINLOCK
163 config RWSEM_XCHGADD_ALGORITHM
166 config ARCH_HAS_ILOG2_U32
169 config ARCH_HAS_ILOG2_U64
172 config ARCH_HAS_CPUFREQ
175 Internal node to signify that the ARCH has CPUFREQ support
176 and that the relevant menu configurations are displayed for
179 config GENERIC_HWEIGHT
183 config GENERIC_CALIBRATE_DELAY
187 config ARCH_MAY_HAVE_PC_FDC
193 config NEED_DMA_MAP_STATE
196 config ARCH_HAS_DMA_SET_COHERENT_MASK
199 config GENERIC_ISA_DMA
205 config NEED_RET_TO_USER
213 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
214 default DRAM_BASE if REMAP_VECTORS_TO_RAM
217 The base address of exception vectors. This must be two pages
220 config ARM_PATCH_PHYS_VIRT
221 bool "Patch physical to virtual translations at runtime" if EMBEDDED
223 depends on !XIP_KERNEL && MMU
224 depends on !ARCH_REALVIEW || !SPARSEMEM
226 Patch phys-to-virt and virt-to-phys translation functions at
227 boot and module load time according to the position of the
228 kernel in system memory.
230 This can only be used with non-XIP MMU kernels where the base
231 of physical memory is at a 16MB boundary.
233 Only disable this option if you know that you do not require
234 this feature (eg, building a kernel for a single machine) and
235 you need to shrink the kernel to the minimal size.
237 config NEED_MACH_GPIO_H
240 Select this when mach/gpio.h is required to provide special
241 definitions for this platform. The need for mach/gpio.h should
242 be avoided when possible.
244 config NEED_MACH_IO_H
247 Select this when mach/io.h is required to provide special
248 definitions for this platform. The need for mach/io.h should
249 be avoided when possible.
251 config NEED_MACH_MEMORY_H
254 Select this when mach/memory.h is required to provide special
255 definitions for this platform. The need for mach/memory.h should
256 be avoided when possible.
259 hex "Physical address of main memory" if MMU
260 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
261 default DRAM_BASE if !MMU
263 Please provide the physical address corresponding to the
264 location of main memory in your system.
270 source "init/Kconfig"
272 source "kernel/Kconfig.freezer"
277 bool "MMU-based Paged Memory Management Support"
280 Select if you want MMU-based virtualised addressing space
281 support by paged memory management. If unsure, say 'Y'.
284 # The "ARM system type" choice list is ordered alphabetically by option
285 # text. Please add new entries in the option alphabetic order.
288 prompt "ARM system type"
289 default ARCH_VERSATILE if !MMU
290 default ARCH_MULTIPLATFORM if MMU
292 config ARCH_MULTIPLATFORM
293 bool "Allow multiple platforms to be selected"
295 select ARM_PATCH_PHYS_VIRT
298 select MULTI_IRQ_HANDLER
302 config ARCH_INTEGRATOR
303 bool "ARM Ltd. Integrator family"
304 select ARCH_HAS_CPUFREQ
307 select COMMON_CLK_VERSATILE
308 select GENERIC_CLOCKEVENTS
311 select MULTI_IRQ_HANDLER
312 select NEED_MACH_MEMORY_H
313 select PLAT_VERSATILE
315 select VERSATILE_FPGA_IRQ
317 Support for ARM's Integrator platform.
320 bool "ARM Ltd. RealView family"
321 select ARCH_WANT_OPTIONAL_GPIOLIB
323 select ARM_TIMER_SP804
325 select COMMON_CLK_VERSATILE
326 select GENERIC_CLOCKEVENTS
327 select GPIO_PL061 if GPIOLIB
329 select NEED_MACH_MEMORY_H
330 select PLAT_VERSATILE
331 select PLAT_VERSATILE_CLCD
333 This enables support for ARM Ltd RealView boards.
335 config ARCH_VERSATILE
336 bool "ARM Ltd. Versatile family"
337 select ARCH_WANT_OPTIONAL_GPIOLIB
339 select ARM_TIMER_SP804
342 select GENERIC_CLOCKEVENTS
343 select HAVE_MACH_CLKDEV
345 select PLAT_VERSATILE
346 select PLAT_VERSATILE_CLCD
347 select PLAT_VERSATILE_CLOCK
348 select VERSATILE_FPGA_IRQ
350 This enables support for ARM Ltd Versatile board.
354 select ARCH_REQUIRE_GPIOLIB
358 select NEED_MACH_GPIO_H
359 select NEED_MACH_IO_H if PCCARD
361 select PINCTRL_AT91 if USE_OF
363 This enables support for systems based on Atmel
364 AT91RM9200 and AT91SAM9* processors.
367 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
368 select ARCH_REQUIRE_GPIOLIB
373 select GENERIC_CLOCKEVENTS
374 select MULTI_IRQ_HANDLER
375 select NEED_MACH_MEMORY_H
378 Support for Cirrus Logic 711x/721x/731x based boards.
381 bool "Cortina Systems Gemini"
382 select ARCH_REQUIRE_GPIOLIB
383 select ARCH_USES_GETTIMEOFFSET
384 select NEED_MACH_GPIO_H
387 Support for the Cortina Systems Gemini family SoCs
391 select ARCH_USES_GETTIMEOFFSET
394 select NEED_MACH_IO_H
395 select NEED_MACH_MEMORY_H
398 This is an evaluation board for the StrongARM processor available
399 from Digital. It has limited hardware on-board, including an
400 Ethernet interface, two PCMCIA sockets, two serial ports and a
405 select ARCH_HAS_HOLES_MEMORYMODEL
406 select ARCH_REQUIRE_GPIOLIB
407 select ARCH_USES_GETTIMEOFFSET
412 select NEED_MACH_MEMORY_H
414 This enables support for the Cirrus EP93xx series of CPUs.
416 config ARCH_FOOTBRIDGE
420 select GENERIC_CLOCKEVENTS
422 select NEED_MACH_IO_H if !MMU
423 select NEED_MACH_MEMORY_H
425 Support for systems based on the DC21285 companion chip
426 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
429 bool "Hilscher NetX based"
433 select GENERIC_CLOCKEVENTS
435 This enables support for systems based on the Hilscher NetX Soc
440 select ARCH_SUPPORTS_MSI
442 select NEED_MACH_MEMORY_H
443 select NEED_RET_TO_USER
448 Support for Intel's IOP13XX (XScale) family of processors.
453 select ARCH_REQUIRE_GPIOLIB
455 select NEED_MACH_GPIO_H
456 select NEED_RET_TO_USER
460 Support for Intel's 80219 and IOP32X (XScale) family of
466 select ARCH_REQUIRE_GPIOLIB
468 select NEED_MACH_GPIO_H
469 select NEED_RET_TO_USER
473 Support for Intel's IOP33X (XScale) family of processors.
478 select ARCH_HAS_DMA_SET_COHERENT_MASK
479 select ARCH_SUPPORTS_BIG_ENDIAN
480 select ARCH_REQUIRE_GPIOLIB
483 select DMABOUNCE if PCI
484 select GENERIC_CLOCKEVENTS
485 select MIGHT_HAVE_PCI
486 select NEED_MACH_IO_H
487 select USB_EHCI_BIG_ENDIAN_MMIO
488 select USB_EHCI_BIG_ENDIAN_DESC
490 Support for Intel's IXP4XX (XScale) family of processors.
494 select ARCH_REQUIRE_GPIOLIB
496 select GENERIC_CLOCKEVENTS
497 select MIGHT_HAVE_PCI
500 select PLAT_ORION_LEGACY
501 select USB_ARCH_HAS_EHCI
504 Support for the Marvell Dove SoC 88AP510
507 bool "Marvell Kirkwood"
508 select ARCH_REQUIRE_GPIOLIB
510 select GENERIC_CLOCKEVENTS
514 select PINCTRL_KIRKWOOD
515 select PLAT_ORION_LEGACY
518 Support for the following Marvell Kirkwood series SoCs:
519 88F6180, 88F6192 and 88F6281.
522 bool "Marvell MV78xx0"
523 select ARCH_REQUIRE_GPIOLIB
525 select GENERIC_CLOCKEVENTS
527 select PLAT_ORION_LEGACY
530 Support for the following Marvell MV78xx0 series SoCs:
536 select ARCH_REQUIRE_GPIOLIB
538 select GENERIC_CLOCKEVENTS
540 select PLAT_ORION_LEGACY
543 Support for the following Marvell Orion 5x series SoCs:
544 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
545 Orion-2 (5281), Orion-1-90 (6183).
548 bool "Marvell PXA168/910/MMP2"
550 select ARCH_REQUIRE_GPIOLIB
552 select GENERIC_ALLOCATOR
553 select GENERIC_CLOCKEVENTS
556 select NEED_MACH_GPIO_H
561 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
564 bool "Micrel/Kendin KS8695"
565 select ARCH_REQUIRE_GPIOLIB
568 select GENERIC_CLOCKEVENTS
569 select NEED_MACH_MEMORY_H
571 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
572 System-on-Chip devices.
575 bool "Nuvoton W90X900 CPU"
576 select ARCH_REQUIRE_GPIOLIB
580 select GENERIC_CLOCKEVENTS
582 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
583 At present, the w90x900 has been renamed nuc900, regarding
584 the ARM series product line, you can login the following
585 link address to know more.
587 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
588 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
592 select ARCH_REQUIRE_GPIOLIB
597 select GENERIC_CLOCKEVENTS
600 select USB_ARCH_HAS_OHCI
603 Support for the NXP LPC32XX family of processors
606 bool "PXA2xx/PXA3xx-based"
608 select ARCH_HAS_CPUFREQ
610 select ARCH_REQUIRE_GPIOLIB
611 select ARM_CPU_SUSPEND if PM
615 select GENERIC_CLOCKEVENTS
618 select MULTI_IRQ_HANDLER
619 select NEED_MACH_GPIO_H
623 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
627 select ARCH_REQUIRE_GPIOLIB
629 select GENERIC_CLOCKEVENTS
632 Support for Qualcomm MSM/QSD based systems. This runs on the
633 apps processor of the MSM/QSD and depends on a shared memory
634 interface to the modem processor which runs the baseband
635 stack and controls some vital subsystems
636 (clock and power control, etc).
639 bool "Renesas SH-Mobile / R-Mobile"
641 select GENERIC_CLOCKEVENTS
642 select HAVE_ARM_SCU if SMP
643 select HAVE_ARM_TWD if LOCAL_TIMERS
645 select HAVE_MACH_CLKDEV
647 select MIGHT_HAVE_CACHE_L2X0
648 select MULTI_IRQ_HANDLER
649 select NEED_MACH_MEMORY_H
651 select PINCTRL if ARCH_WANT_OPTIONAL_GPIOLIB
652 select PM_GENERIC_DOMAINS if PM
655 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
660 select ARCH_MAY_HAVE_PC_FDC
661 select ARCH_SPARSEMEM_ENABLE
662 select ARCH_USES_GETTIMEOFFSET
665 select HAVE_PATA_PLATFORM
667 select NEED_MACH_IO_H
668 select NEED_MACH_MEMORY_H
672 On the Acorn Risc-PC, Linux can support the internal IDE disk and
673 CD-ROM interface, serial and parallel port, and the floppy drive.
677 select ARCH_HAS_CPUFREQ
679 select ARCH_REQUIRE_GPIOLIB
680 select ARCH_SPARSEMEM_ENABLE
685 select GENERIC_CLOCKEVENTS
688 select NEED_MACH_GPIO_H
689 select NEED_MACH_MEMORY_H
692 Support for StrongARM 11x0 based boards.
695 bool "Samsung S3C24XX SoCs"
696 select ARCH_HAS_CPUFREQ
697 select ARCH_REQUIRE_GPIOLIB
700 select GENERIC_CLOCKEVENTS
702 select HAVE_S3C2410_I2C if I2C
703 select HAVE_S3C2410_WATCHDOG if WATCHDOG
704 select HAVE_S3C_RTC if RTC_CLASS
705 select MULTI_IRQ_HANDLER
706 select NEED_MACH_GPIO_H
707 select NEED_MACH_IO_H
709 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
710 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
711 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
712 Samsung SMDK2410 development board (and derivatives).
715 bool "Samsung S3C64XX"
716 select ARCH_HAS_CPUFREQ
717 select ARCH_REQUIRE_GPIOLIB
722 select GENERIC_CLOCKEVENTS
724 select HAVE_S3C2410_I2C if I2C
725 select HAVE_S3C2410_WATCHDOG if WATCHDOG
727 select NEED_MACH_GPIO_H
731 select S3C_GPIO_TRACK
732 select SAMSUNG_CLKSRC
733 select SAMSUNG_GPIOLIB_4BIT
734 select SAMSUNG_IRQ_VIC_TIMER
735 select USB_ARCH_HAS_OHCI
737 Samsung S3C64XX series based systems
740 bool "Samsung S5P6440 S5P6450"
744 select GENERIC_CLOCKEVENTS
746 select HAVE_S3C2410_I2C if I2C
747 select HAVE_S3C2410_WATCHDOG if WATCHDOG
748 select HAVE_S3C_RTC if RTC_CLASS
749 select NEED_MACH_GPIO_H
751 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
755 bool "Samsung S5PC100"
756 select ARCH_REQUIRE_GPIOLIB
760 select GENERIC_CLOCKEVENTS
762 select HAVE_S3C2410_I2C if I2C
763 select HAVE_S3C2410_WATCHDOG if WATCHDOG
764 select HAVE_S3C_RTC if RTC_CLASS
765 select NEED_MACH_GPIO_H
767 Samsung S5PC100 series based systems
770 bool "Samsung S5PV210/S5PC110"
771 select ARCH_HAS_CPUFREQ
772 select ARCH_HAS_HOLES_MEMORYMODEL
773 select ARCH_SPARSEMEM_ENABLE
777 select GENERIC_CLOCKEVENTS
779 select HAVE_S3C2410_I2C if I2C
780 select HAVE_S3C2410_WATCHDOG if WATCHDOG
781 select HAVE_S3C_RTC if RTC_CLASS
782 select NEED_MACH_GPIO_H
783 select NEED_MACH_MEMORY_H
785 Samsung S5PV210/S5PC110 series based systems
788 bool "Samsung EXYNOS"
789 select ARCH_HAS_CPUFREQ
790 select ARCH_HAS_HOLES_MEMORYMODEL
791 select ARCH_SPARSEMEM_ENABLE
795 select GENERIC_CLOCKEVENTS
797 select HAVE_S3C2410_I2C if I2C
798 select HAVE_S3C2410_WATCHDOG if WATCHDOG
799 select HAVE_S3C_RTC if RTC_CLASS
800 select NEED_MACH_GPIO_H
801 select NEED_MACH_MEMORY_H
803 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
807 select ARCH_USES_GETTIMEOFFSET
811 select NEED_MACH_MEMORY_H
816 Support for the StrongARM based Digital DNARD machine, also known
817 as "Shark" (<http://www.shark-linux.de/shark.html>).
820 bool "ST-Ericsson U300 Series"
822 select ARCH_REQUIRE_GPIOLIB
824 select ARM_PATCH_PHYS_VIRT
830 select GENERIC_CLOCKEVENTS
834 Support for ST-Ericsson U300 series mobile platforms.
838 select ARCH_HAS_HOLES_MEMORYMODEL
839 select ARCH_REQUIRE_GPIOLIB
841 select GENERIC_ALLOCATOR
842 select GENERIC_CLOCKEVENTS
843 select GENERIC_IRQ_CHIP
845 select NEED_MACH_GPIO_H
849 Support for TI's DaVinci platform.
854 select ARCH_HAS_CPUFREQ
855 select ARCH_HAS_HOLES_MEMORYMODEL
857 select ARCH_REQUIRE_GPIOLIB
860 select GENERIC_CLOCKEVENTS
861 select GENERIC_IRQ_CHIP
865 select NEED_MACH_IO_H if PCCARD
866 select NEED_MACH_MEMORY_H
868 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
872 menu "Multiple platform selection"
873 depends on ARCH_MULTIPLATFORM
875 comment "CPU Core family selection"
878 bool "ARMv4 based platforms (FA526, StrongARM)"
879 depends on !ARCH_MULTI_V6_V7
880 select ARCH_MULTI_V4_V5
882 config ARCH_MULTI_V4T
883 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
884 depends on !ARCH_MULTI_V6_V7
885 select ARCH_MULTI_V4_V5
888 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
889 depends on !ARCH_MULTI_V6_V7
890 select ARCH_MULTI_V4_V5
892 config ARCH_MULTI_V4_V5
896 bool "ARMv6 based platforms (ARM11)"
897 select ARCH_MULTI_V6_V7
901 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
903 select ARCH_MULTI_V6_V7
906 config ARCH_MULTI_V6_V7
909 config ARCH_MULTI_CPU_AUTO
910 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
916 # This is sorted alphabetically by mach-* pathname. However, plat-*
917 # Kconfigs may be included either alphabetically (according to the
918 # plat- suffix) or along side the corresponding mach-* source.
920 source "arch/arm/mach-mvebu/Kconfig"
922 source "arch/arm/mach-at91/Kconfig"
924 source "arch/arm/mach-bcm/Kconfig"
926 source "arch/arm/mach-bcm2835/Kconfig"
928 source "arch/arm/mach-clps711x/Kconfig"
930 source "arch/arm/mach-cns3xxx/Kconfig"
932 source "arch/arm/mach-davinci/Kconfig"
934 source "arch/arm/mach-dove/Kconfig"
936 source "arch/arm/mach-ep93xx/Kconfig"
938 source "arch/arm/mach-footbridge/Kconfig"
940 source "arch/arm/mach-gemini/Kconfig"
942 source "arch/arm/mach-highbank/Kconfig"
944 source "arch/arm/mach-integrator/Kconfig"
946 source "arch/arm/mach-iop32x/Kconfig"
948 source "arch/arm/mach-iop33x/Kconfig"
950 source "arch/arm/mach-iop13xx/Kconfig"
952 source "arch/arm/mach-ixp4xx/Kconfig"
954 source "arch/arm/mach-kirkwood/Kconfig"
956 source "arch/arm/mach-ks8695/Kconfig"
958 source "arch/arm/mach-msm/Kconfig"
960 source "arch/arm/mach-mv78xx0/Kconfig"
962 source "arch/arm/mach-imx/Kconfig"
964 source "arch/arm/mach-mxs/Kconfig"
966 source "arch/arm/mach-netx/Kconfig"
968 source "arch/arm/mach-nomadik/Kconfig"
970 source "arch/arm/plat-omap/Kconfig"
972 source "arch/arm/mach-omap1/Kconfig"
974 source "arch/arm/mach-omap2/Kconfig"
976 source "arch/arm/mach-orion5x/Kconfig"
978 source "arch/arm/mach-picoxcell/Kconfig"
980 source "arch/arm/mach-pxa/Kconfig"
981 source "arch/arm/plat-pxa/Kconfig"
983 source "arch/arm/mach-mmp/Kconfig"
985 source "arch/arm/mach-realview/Kconfig"
987 source "arch/arm/mach-rockchip/Kconfig"
989 source "arch/arm/mach-sa1100/Kconfig"
991 source "arch/arm/plat-samsung/Kconfig"
993 source "arch/arm/mach-socfpga/Kconfig"
995 source "arch/arm/mach-spear/Kconfig"
997 source "arch/arm/mach-s3c24xx/Kconfig"
1000 source "arch/arm/mach-s3c64xx/Kconfig"
1003 source "arch/arm/mach-s5p64x0/Kconfig"
1005 source "arch/arm/mach-s5pc100/Kconfig"
1007 source "arch/arm/mach-s5pv210/Kconfig"
1009 source "arch/arm/mach-exynos/Kconfig"
1011 source "arch/arm/mach-shmobile/Kconfig"
1013 source "arch/arm/mach-sunxi/Kconfig"
1015 source "arch/arm/mach-prima2/Kconfig"
1017 source "arch/arm/mach-tegra/Kconfig"
1019 source "arch/arm/mach-u300/Kconfig"
1021 source "arch/arm/mach-ux500/Kconfig"
1023 source "arch/arm/mach-versatile/Kconfig"
1025 source "arch/arm/mach-vexpress/Kconfig"
1026 source "arch/arm/plat-versatile/Kconfig"
1028 source "arch/arm/mach-virt/Kconfig"
1030 source "arch/arm/mach-vt8500/Kconfig"
1032 source "arch/arm/mach-w90x900/Kconfig"
1034 source "arch/arm/mach-zynq/Kconfig"
1036 # Definitions to make life easier
1042 select GENERIC_CLOCKEVENTS
1048 select GENERIC_IRQ_CHIP
1051 config PLAT_ORION_LEGACY
1058 config PLAT_VERSATILE
1061 config ARM_TIMER_SP804
1064 select CLKSRC_OF if OF
1066 source arch/arm/mm/Kconfig
1070 default 16 if ARCH_EP93XX
1074 bool "Enable iWMMXt support" if !CPU_PJ4
1075 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1076 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
1078 Enable support for iWMMXt context switching at run time if
1079 running on a CPU that supports it.
1083 depends on CPU_XSCALE
1086 config MULTI_IRQ_HANDLER
1089 Allow each machine to specify it's own IRQ handler at run time.
1092 source "arch/arm/Kconfig-nommu"
1095 config PJ4B_ERRATA_4742
1096 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1097 depends on CPU_PJ4B && MACH_ARMADA_370
1100 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1101 Event (WFE) IDLE states, a specific timing sensitivity exists between
1102 the retiring WFI/WFE instructions and the newly issued subsequent
1103 instructions. This sensitivity can result in a CPU hang scenario.
1105 The software must insert either a Data Synchronization Barrier (DSB)
1106 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1109 config ARM_ERRATA_326103
1110 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1113 Executing a SWP instruction to read-only memory does not set bit 11
1114 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1115 treat the access as a read, preventing a COW from occurring and
1116 causing the faulting task to livelock.
1118 config ARM_ERRATA_411920
1119 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1120 depends on CPU_V6 || CPU_V6K
1122 Invalidation of the Instruction Cache operation can
1123 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1124 It does not affect the MPCore. This option enables the ARM Ltd.
1125 recommended workaround.
1127 config ARM_ERRATA_430973
1128 bool "ARM errata: Stale prediction on replaced interworking branch"
1131 This option enables the workaround for the 430973 Cortex-A8
1132 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1133 interworking branch is replaced with another code sequence at the
1134 same virtual address, whether due to self-modifying code or virtual
1135 to physical address re-mapping, Cortex-A8 does not recover from the
1136 stale interworking branch prediction. This results in Cortex-A8
1137 executing the new code sequence in the incorrect ARM or Thumb state.
1138 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1139 and also flushes the branch target cache at every context switch.
1140 Note that setting specific bits in the ACTLR register may not be
1141 available in non-secure mode.
1143 config ARM_ERRATA_458693
1144 bool "ARM errata: Processor deadlock when a false hazard is created"
1146 depends on !ARCH_MULTIPLATFORM
1148 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1149 erratum. For very specific sequences of memory operations, it is
1150 possible for a hazard condition intended for a cache line to instead
1151 be incorrectly associated with a different cache line. This false
1152 hazard might then cause a processor deadlock. The workaround enables
1153 the L1 caching of the NEON accesses and disables the PLD instruction
1154 in the ACTLR register. Note that setting specific bits in the ACTLR
1155 register may not be available in non-secure mode.
1157 config ARM_ERRATA_460075
1158 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1160 depends on !ARCH_MULTIPLATFORM
1162 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1163 erratum. Any asynchronous access to the L2 cache may encounter a
1164 situation in which recent store transactions to the L2 cache are lost
1165 and overwritten with stale memory contents from external memory. The
1166 workaround disables the write-allocate mode for the L2 cache via the
1167 ACTLR register. Note that setting specific bits in the ACTLR register
1168 may not be available in non-secure mode.
1170 config ARM_ERRATA_742230
1171 bool "ARM errata: DMB operation may be faulty"
1172 depends on CPU_V7 && SMP
1173 depends on !ARCH_MULTIPLATFORM
1175 This option enables the workaround for the 742230 Cortex-A9
1176 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1177 between two write operations may not ensure the correct visibility
1178 ordering of the two writes. This workaround sets a specific bit in
1179 the diagnostic register of the Cortex-A9 which causes the DMB
1180 instruction to behave as a DSB, ensuring the correct behaviour of
1183 config ARM_ERRATA_742231
1184 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1185 depends on CPU_V7 && SMP
1186 depends on !ARCH_MULTIPLATFORM
1188 This option enables the workaround for the 742231 Cortex-A9
1189 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1190 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1191 accessing some data located in the same cache line, may get corrupted
1192 data due to bad handling of the address hazard when the line gets
1193 replaced from one of the CPUs at the same time as another CPU is
1194 accessing it. This workaround sets specific bits in the diagnostic
1195 register of the Cortex-A9 which reduces the linefill issuing
1196 capabilities of the processor.
1198 config PL310_ERRATA_588369
1199 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1200 depends on CACHE_L2X0
1202 The PL310 L2 cache controller implements three types of Clean &
1203 Invalidate maintenance operations: by Physical Address
1204 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1205 They are architecturally defined to behave as the execution of a
1206 clean operation followed immediately by an invalidate operation,
1207 both performing to the same memory location. This functionality
1208 is not correctly implemented in PL310 as clean lines are not
1209 invalidated as a result of these operations.
1211 config ARM_ERRATA_643719
1212 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1213 depends on CPU_V7 && SMP
1215 This option enables the workaround for the 643719 Cortex-A9 (prior to
1216 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1217 register returns zero when it should return one. The workaround
1218 corrects this value, ensuring cache maintenance operations which use
1219 it behave as intended and avoiding data corruption.
1221 config ARM_ERRATA_720789
1222 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1225 This option enables the workaround for the 720789 Cortex-A9 (prior to
1226 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1227 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1228 As a consequence of this erratum, some TLB entries which should be
1229 invalidated are not, resulting in an incoherency in the system page
1230 tables. The workaround changes the TLB flushing routines to invalidate
1231 entries regardless of the ASID.
1233 config PL310_ERRATA_727915
1234 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1235 depends on CACHE_L2X0
1237 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1238 operation (offset 0x7FC). This operation runs in background so that
1239 PL310 can handle normal accesses while it is in progress. Under very
1240 rare circumstances, due to this erratum, write data can be lost when
1241 PL310 treats a cacheable write transaction during a Clean &
1242 Invalidate by Way operation.
1244 config ARM_ERRATA_743622
1245 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1247 depends on !ARCH_MULTIPLATFORM
1249 This option enables the workaround for the 743622 Cortex-A9
1250 (r2p*) erratum. Under very rare conditions, a faulty
1251 optimisation in the Cortex-A9 Store Buffer may lead to data
1252 corruption. This workaround sets a specific bit in the diagnostic
1253 register of the Cortex-A9 which disables the Store Buffer
1254 optimisation, preventing the defect from occurring. This has no
1255 visible impact on the overall performance or power consumption of the
1258 config ARM_ERRATA_751472
1259 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1261 depends on !ARCH_MULTIPLATFORM
1263 This option enables the workaround for the 751472 Cortex-A9 (prior
1264 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1265 completion of a following broadcasted operation if the second
1266 operation is received by a CPU before the ICIALLUIS has completed,
1267 potentially leading to corrupted entries in the cache or TLB.
1269 config PL310_ERRATA_753970
1270 bool "PL310 errata: cache sync operation may be faulty"
1271 depends on CACHE_PL310
1273 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1275 Under some condition the effect of cache sync operation on
1276 the store buffer still remains when the operation completes.
1277 This means that the store buffer is always asked to drain and
1278 this prevents it from merging any further writes. The workaround
1279 is to replace the normal offset of cache sync operation (0x730)
1280 by another offset targeting an unmapped PL310 register 0x740.
1281 This has the same effect as the cache sync operation: store buffer
1282 drain and waiting for all buffers empty.
1284 config ARM_ERRATA_754322
1285 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1288 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1289 r3p*) erratum. A speculative memory access may cause a page table walk
1290 which starts prior to an ASID switch but completes afterwards. This
1291 can populate the micro-TLB with a stale entry which may be hit with
1292 the new ASID. This workaround places two dsb instructions in the mm
1293 switching code so that no page table walks can cross the ASID switch.
1295 config ARM_ERRATA_754327
1296 bool "ARM errata: no automatic Store Buffer drain"
1297 depends on CPU_V7 && SMP
1299 This option enables the workaround for the 754327 Cortex-A9 (prior to
1300 r2p0) erratum. The Store Buffer does not have any automatic draining
1301 mechanism and therefore a livelock may occur if an external agent
1302 continuously polls a memory location waiting to observe an update.
1303 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1304 written polling loops from denying visibility of updates to memory.
1306 config ARM_ERRATA_364296
1307 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1308 depends on CPU_V6 && !SMP
1310 This options enables the workaround for the 364296 ARM1136
1311 r0p2 erratum (possible cache data corruption with
1312 hit-under-miss enabled). It sets the undocumented bit 31 in
1313 the auxiliary control register and the FI bit in the control
1314 register, thus disabling hit-under-miss without putting the
1315 processor into full low interrupt latency mode. ARM11MPCore
1318 config ARM_ERRATA_764369
1319 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1320 depends on CPU_V7 && SMP
1322 This option enables the workaround for erratum 764369
1323 affecting Cortex-A9 MPCore with two or more processors (all
1324 current revisions). Under certain timing circumstances, a data
1325 cache line maintenance operation by MVA targeting an Inner
1326 Shareable memory region may fail to proceed up to either the
1327 Point of Coherency or to the Point of Unification of the
1328 system. This workaround adds a DSB instruction before the
1329 relevant cache maintenance functions and sets a specific bit
1330 in the diagnostic control register of the SCU.
1332 config PL310_ERRATA_769419
1333 bool "PL310 errata: no automatic Store Buffer drain"
1334 depends on CACHE_L2X0
1336 On revisions of the PL310 prior to r3p2, the Store Buffer does
1337 not automatically drain. This can cause normal, non-cacheable
1338 writes to be retained when the memory system is idle, leading
1339 to suboptimal I/O performance for drivers using coherent DMA.
1340 This option adds a write barrier to the cpu_idle loop so that,
1341 on systems with an outer cache, the store buffer is drained
1344 config ARM_ERRATA_775420
1345 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1348 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1349 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1350 operation aborts with MMU exception, it might cause the processor
1351 to deadlock. This workaround puts DSB before executing ISB if
1352 an abort may occur on cache maintenance.
1354 config ARM_ERRATA_798181
1355 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1356 depends on CPU_V7 && SMP
1358 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1359 adequately shooting down all use of the old entries. This
1360 option enables the Linux kernel workaround for this erratum
1361 which sends an IPI to the CPUs that are running the same ASID
1362 as the one being invalidated.
1364 config ARM_ERRATA_818325
1365 bool "ARM errata: Execution of an UNPREDICTABLE STR or STM instruction might deadlock"
1368 This option enables the workaround for the 818325 Cortex-A12
1369 (r0p0..r0p1-00lac0-rc11) erratum. When a CPU executes a sequence of
1370 two conditional store instructions with opposite condition code and
1371 updating the same register, the system might enter a deadlock if the
1372 second conditional instruction is an UNPREDICTABLE STR or STM
1373 instruction. This workaround setting bit[12] of the Feature Register
1374 prevents the erratum. This bit disables an optimisation applied to a
1375 sequence of 2 instructions that use opposing condition codes.
1377 config ARM_ERRATA_821420
1378 bool "ARM errata: A sequence of VMOV to core registers instruction might lead to a deadlock"
1381 This option enables the workaround for the 821420 Cortex-A12 (r0p0,
1382 r0p1) erratum. In very rare timing conditions, a sequence of VMOV to
1383 Core registers instructions, for which the second one is in the
1384 shadow of a branch or abort, can lead to a deadlock when the VMOV
1385 instructions are issued out-of-order.
1389 source "arch/arm/common/Kconfig"
1399 Find out whether you have ISA slots on your motherboard. ISA is the
1400 name of a bus system, i.e. the way the CPU talks to the other stuff
1401 inside your box. Other bus systems are PCI, EISA, MicroChannel
1402 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1403 newer boards don't support it. If you have ISA, say Y, otherwise N.
1405 # Select ISA DMA controller support
1410 # Select ISA DMA interface
1415 bool "PCI support" if MIGHT_HAVE_PCI
1417 Find out whether you have a PCI motherboard. PCI is the name of a
1418 bus system, i.e. the way the CPU talks to the other stuff inside
1419 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1420 VESA. If you have PCI, say Y, otherwise N.
1426 config PCI_NANOENGINE
1427 bool "BSE nanoEngine PCI support"
1428 depends on SA1100_NANOENGINE
1430 Enable PCI on the BSE nanoEngine board.
1435 # Select the host bridge type
1436 config PCI_HOST_VIA82C505
1438 depends on PCI && ARCH_SHARK
1441 config PCI_HOST_ITE8152
1443 depends on PCI && MACH_ARMCORE
1447 source "drivers/pci/Kconfig"
1449 source "drivers/pcmcia/Kconfig"
1453 menu "Kernel Features"
1458 This option should be selected by machines which have an SMP-
1461 The only effect of this option is to make the SMP-related
1462 options available to the user for configuration.
1465 bool "Symmetric Multi-Processing"
1466 depends on CPU_V6K || CPU_V7
1467 depends on GENERIC_CLOCKEVENTS
1470 select USE_GENERIC_SMP_HELPERS
1472 This enables support for systems with more than one CPU. If you have
1473 a system with only one CPU, like most personal computers, say N. If
1474 you have a system with more than one CPU, say Y.
1476 If you say N here, the kernel will run on single and multiprocessor
1477 machines, but will use only one CPU of a multiprocessor machine. If
1478 you say Y here, the kernel will run on many, but not all, single
1479 processor machines. On a single processor machine, the kernel will
1480 run faster if you say N here.
1482 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1483 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1484 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1486 If you don't know what to do here, say N.
1489 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1490 depends on SMP && !XIP_KERNEL
1493 SMP kernels contain instructions which fail on non-SMP processors.
1494 Enabling this option allows the kernel to modify itself to make
1495 these instructions safe. Disabling it allows about 1K of space
1498 If you don't know what to do here, say Y.
1500 config ARM_CPU_TOPOLOGY
1501 bool "Support cpu topology definition"
1502 depends on SMP && CPU_V7
1505 Support ARM cpu topology definition. The MPIDR register defines
1506 affinity between processors which is then used to describe the cpu
1507 topology of an ARM System.
1510 bool "Multi-core scheduler support"
1511 depends on ARM_CPU_TOPOLOGY
1513 Multi-core scheduler support improves the CPU scheduler's decision
1514 making when dealing with multi-core CPU chips at a cost of slightly
1515 increased overhead in some places. If unsure say N here.
1518 bool "SMT scheduler support"
1519 depends on ARM_CPU_TOPOLOGY
1521 Improves the CPU scheduler's decision making when dealing with
1522 MultiThreading at a cost of slightly increased overhead in some
1523 places. If unsure say N here.
1525 config DISABLE_CPU_SCHED_DOMAIN_BALANCE
1526 bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing"
1528 Disables scheduler load-balancing at CPU sched domain level.
1531 bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling"
1532 depends on DISABLE_CPU_SCHED_DOMAIN_BALANCE && SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP
1534 Experimental scheduler optimizations for heterogeneous platforms.
1535 Attempts to introspectively select task affinity to optimize power
1536 and performance. Basic support for multiple (>2) cpu types is in place,
1537 but it has only been tested with two types of cpus.
1538 There is currently no support for migration of task groups, hence
1539 !SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
1540 between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
1541 When turned on, this option adds sys/kernel/hmp directory which
1542 contains the following files:
1543 up_threshold - the load average threshold used for up migration
1545 down_threshold - the load average threshold used for down migration
1547 hmp_domains - a list of cpumasks for the present HMP domains,
1548 starting with the 'biggest' and ending with the
1550 Note that both the threshold files can be written at runtime to
1551 control scheduler behaviour.
1553 config SCHED_HMP_PRIO_FILTER
1554 bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
1555 depends on SCHED_HMP
1557 Enables task priority based HMP migration filter. Any task with
1558 a NICE value above the threshold will always be on low-power cpus
1559 with less compute capacity.
1561 config SCHED_HMP_PRIO_FILTER_VAL
1562 int "NICE priority threshold"
1564 depends on SCHED_HMP_PRIO_FILTER
1566 config HMP_FAST_CPU_MASK
1567 string "HMP scheduler fast CPU mask"
1568 depends on SCHED_HMP
1570 Leave empty to use device tree information.
1571 Specify the cpuids of the fast CPUs in the system as a list string,
1572 e.g. cpuid 0+1 should be specified as 0-1.
1574 config HMP_SLOW_CPU_MASK
1575 string "HMP scheduler slow CPU mask"
1576 depends on SCHED_HMP
1578 Leave empty to use device tree information.
1579 Specify the cpuids of the slow CPUs in the system as a list string,
1580 e.g. cpuid 0+1 should be specified as 0-1.
1582 config HMP_VARIABLE_SCALE
1583 bool "Allows changing the load tracking scale through sysfs"
1584 depends on SCHED_HMP
1586 When turned on, this option exports the load average period value
1587 for the load tracking patches through sysfs.
1588 The values can be modified to change the rate of load accumulation
1589 used for HMP migration. 'load_avg_period_ms' is the time in ms to
1590 reach a load average of 0.5 for an idle task of 0 load average
1591 ratio which becomes 100% busy.
1592 For example, with load_avg_period_ms = 128 and up_threshold = 512,
1593 a running task with a load of 0 will be migrated to a bigger CPU after
1594 128ms, because after 128ms its load_avg_ratio is 0.5 and the real
1595 up_threshold is 0.5.
1596 This patch has the same behavior as changing the Y of the load
1597 average computation to
1598 (1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
1599 but removes intermediate overflows in computation.
1601 config HMP_FREQUENCY_INVARIANT_SCALE
1602 bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
1603 depends on SCHED_HMP && CPU_FREQ
1605 Scales the current load contribution in line with the frequency
1606 of the CPU that the task was executed on.
1607 In this version, we use a simple linear scale derived from the
1608 maximum frequency reported by CPUFreq.
1609 Restricting tracked load to be scaled by the CPU's frequency
1610 represents the consumption of possible compute capacity
1611 (rather than consumption of actual instantaneous capacity as
1612 normal) and allows the HMP migration's simple threshold
1613 migration strategy to interact more predictably with CPUFreq's
1614 asynchronous compute capacity changes.
1616 config SCHED_HMP_LITTLE_PACKING
1617 bool "Small task packing for HMP"
1618 depends on SCHED_HMP
1621 Allows the HMP Scheduler to pack small tasks into CPUs in the
1622 smallest HMP domain.
1623 Controlled by two sysfs files in sys/kernel/hmp.
1624 packing_enable: 1 to enable, 0 to disable packing. Default 1.
1625 packing_limit: runqueue load ratio where a RQ is considered
1626 to be full. Default is NICE_0_LOAD * 9/8.
1631 This option enables support for the ARM system coherency unit
1633 config HAVE_ARM_ARCH_TIMER
1634 bool "Architected timer support"
1636 select ARM_ARCH_TIMER
1638 This option enables support for the ARM architected timer
1643 select CLKSRC_OF if OF
1645 This options enables support for the ARM timer and watchdog unit
1648 bool "Multi-Cluster Power Management"
1649 depends on CPU_V7 && SMP
1651 This option provides the common power management infrastructure
1652 for (multi-)cluster based systems, such as big.LITTLE based
1656 bool "big.LITTLE support (Experimental)"
1657 depends on CPU_V7 && SMP
1660 This option enables support for the big.LITTLE architecture.
1663 bool "big.LITTLE switcher support"
1664 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1666 select ARM_CPU_SUSPEND
1668 The big.LITTLE "switcher" provides the core functionality to
1669 transparently handle transition between a cluster of A15's
1670 and a cluster of A7's in a big.LITTLE system.
1672 config BL_SWITCHER_DUMMY_IF
1673 tristate "Simple big.LITTLE switcher user interface"
1674 depends on BL_SWITCHER && DEBUG_KERNEL
1676 This is a simple and dummy char dev interface to control
1677 the big.LITTLE switcher core code. It is meant for
1678 debugging purposes only.
1681 prompt "Memory split"
1684 Select the desired split between kernel and user memory.
1686 If you are not absolutely sure what you are doing, leave this
1690 bool "3G/1G user/kernel split"
1692 bool "2G/2G user/kernel split"
1694 bool "1G/3G user/kernel split"
1699 default 0x40000000 if VMSPLIT_1G
1700 default 0x80000000 if VMSPLIT_2G
1704 int "Maximum number of CPUs (2-32)"
1710 bool "Support for hot-pluggable CPUs"
1711 depends on SMP && HOTPLUG
1713 Say Y here to experiment with turning CPUs off and on. CPUs
1714 can be controlled through /sys/devices/system/cpu.
1717 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1720 Say Y here if you want Linux to communicate with system firmware
1721 implementing the PSCI specification for CPU-centric power
1722 management operations described in ARM document number ARM DEN
1723 0022A ("Power State Coordination Interface System Software on
1727 bool "Use local timer interrupts"
1731 Enable support for local timers on SMP platforms, rather then the
1732 legacy IPI broadcast method. Local timers allows the system
1733 accounting to be spread across the timer interval, preventing a
1734 "thundering herd" at every timer tick.
1736 # The GPIO number here must be sorted by descending number. In case of
1737 # a multiplatform kernel, we just want the highest value required by the
1738 # selected platforms.
1741 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1742 default 512 if SOC_OMAP5
1743 default 512 if ARCH_ROCKCHIP
1744 default 392 if ARCH_U8500
1745 default 352 if ARCH_VT8500
1746 default 288 if ARCH_SUNXI
1747 default 264 if MACH_H4700
1750 Maximum number of GPIOs in the system.
1752 If unsure, leave the default value.
1754 source kernel/Kconfig.preempt
1758 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1759 ARCH_S5PV210 || ARCH_EXYNOS4
1760 default AT91_TIMER_HZ if ARCH_AT91
1761 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1765 def_bool HIGH_RES_TIMERS
1767 config THUMB2_KERNEL
1768 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1769 depends on CPU_V7 && !CPU_V6 && !CPU_V6K
1770 default y if CPU_THUMBONLY
1772 select ARM_ASM_UNIFIED
1775 By enabling this option, the kernel will be compiled in
1776 Thumb-2 mode. A compiler/assembler that understand the unified
1777 ARM-Thumb syntax is needed.
1781 config THUMB2_AVOID_R_ARM_THM_JUMP11
1782 bool "Work around buggy Thumb-2 short branch relocations in gas"
1783 depends on THUMB2_KERNEL && MODULES
1786 Various binutils versions can resolve Thumb-2 branches to
1787 locally-defined, preemptible global symbols as short-range "b.n"
1788 branch instructions.
1790 This is a problem, because there's no guarantee the final
1791 destination of the symbol, or any candidate locations for a
1792 trampoline, are within range of the branch. For this reason, the
1793 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1794 relocation in modules at all, and it makes little sense to add
1797 The symptom is that the kernel fails with an "unsupported
1798 relocation" error when loading some modules.
1800 Until fixed tools are available, passing
1801 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1802 code which hits this problem, at the cost of a bit of extra runtime
1803 stack usage in some cases.
1805 The problem is described in more detail at:
1806 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1808 Only Thumb-2 kernels are affected.
1810 Unless you are sure your tools don't have this problem, say Y.
1812 config ARM_ASM_UNIFIED
1816 bool "Use the ARM EABI to compile the kernel"
1818 This option allows for the kernel to be compiled using the latest
1819 ARM ABI (aka EABI). This is only useful if you are using a user
1820 space environment that is also compiled with EABI.
1822 Since there are major incompatibilities between the legacy ABI and
1823 EABI, especially with regard to structure member alignment, this
1824 option also changes the kernel syscall calling convention to
1825 disambiguate both ABIs and allow for backward compatibility support
1826 (selected with CONFIG_OABI_COMPAT).
1828 To use this you need GCC version 4.0.0 or later.
1831 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1832 depends on AEABI && !THUMB2_KERNEL
1835 This option preserves the old syscall interface along with the
1836 new (ARM EABI) one. It also provides a compatibility layer to
1837 intercept syscalls that have structure arguments which layout
1838 in memory differs between the legacy ABI and the new ARM EABI
1839 (only for non "thumb" binaries). This option adds a tiny
1840 overhead to all syscalls and produces a slightly larger kernel.
1841 If you know you'll be using only pure EABI user space then you
1842 can say N here. If this option is not selected and you attempt
1843 to execute a legacy ABI binary then the result will be
1844 UNPREDICTABLE (in fact it can be predicted that it won't work
1845 at all). If in doubt say Y.
1847 config ARCH_HAS_HOLES_MEMORYMODEL
1850 config ARCH_SPARSEMEM_ENABLE
1853 config ARCH_SPARSEMEM_DEFAULT
1854 def_bool ARCH_SPARSEMEM_ENABLE
1856 config ARCH_SELECT_MEMORY_MODEL
1857 def_bool ARCH_SPARSEMEM_ENABLE
1859 config HAVE_ARCH_PFN_VALID
1860 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1863 bool "High Memory Support"
1866 The address space of ARM processors is only 4 Gigabytes large
1867 and it has to accommodate user address space, kernel address
1868 space as well as some memory mapped IO. That means that, if you
1869 have a large amount of physical memory and/or IO, not all of the
1870 memory can be "permanently mapped" by the kernel. The physical
1871 memory that is not permanently mapped is called "high memory".
1873 Depending on the selected kernel/user memory split, minimum
1874 vmalloc space and actual amount of RAM, you may not need this
1875 option which should result in a slightly faster kernel.
1880 bool "Allocate 2nd-level pagetables from highmem"
1883 config HW_PERF_EVENTS
1884 bool "Enable hardware performance counter support for perf events"
1885 depends on PERF_EVENTS
1888 Enable hardware performance counter support for perf events. If
1889 disabled, perf events will use software events only.
1891 config SYS_SUPPORTS_HUGETLBFS
1895 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1901 config FORCE_MAX_ZONEORDER
1902 int "Maximum zone order" if ARCH_SHMOBILE
1903 range 11 64 if ARCH_SHMOBILE
1904 default "12" if SOC_AM33XX
1905 default "9" if SA1111
1908 The kernel memory allocator divides physically contiguous memory
1909 blocks into "zones", where each zone is a power of two number of
1910 pages. This option selects the largest power of two that the kernel
1911 keeps in the memory allocator. If you need to allocate very large
1912 blocks of physically contiguous memory, then you may need to
1913 increase this value.
1915 This config option is actually maximum order plus one. For example,
1916 a value of 11 means that the largest free memory block is 2^10 pages.
1918 config ALIGNMENT_TRAP
1920 depends on CPU_CP15_MMU
1921 default y if !ARCH_EBSA110
1922 select HAVE_PROC_CPU if PROC_FS
1924 ARM processors cannot fetch/store information which is not
1925 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1926 address divisible by 4. On 32-bit ARM processors, these non-aligned
1927 fetch/store instructions will be emulated in software if you say
1928 here, which has a severe performance impact. This is necessary for
1929 correct operation of some network protocols. With an IP-only
1930 configuration it is safe to say N, otherwise say Y.
1932 config UACCESS_WITH_MEMCPY
1933 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1935 default y if CPU_FEROCEON
1937 Implement faster copy_to_user and clear_user methods for CPU
1938 cores where a 8-word STM instruction give significantly higher
1939 memory write throughput than a sequence of individual 32bit stores.
1941 A possible side effect is a slight increase in scheduling latency
1942 between threads sharing the same address space if they invoke
1943 such copy operations with large buffers.
1945 However, if the CPU data cache is using a write-allocate mode,
1946 this option is unlikely to provide any performance gain.
1950 prompt "Enable seccomp to safely compute untrusted bytecode"
1952 This kernel feature is useful for number crunching applications
1953 that may need to compute untrusted bytecode during their
1954 execution. By using pipes or other transports made available to
1955 the process as file descriptors supporting the read/write
1956 syscalls, it's possible to isolate those applications in
1957 their own address space using seccomp. Once seccomp is
1958 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1959 and the task is only allowed to execute a few safe syscalls
1960 defined by each seccomp mode.
1962 config CC_STACKPROTECTOR
1963 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1965 This option turns on the -fstack-protector GCC feature. This
1966 feature puts, at the beginning of functions, a canary value on
1967 the stack just before the return address, and validates
1968 the value just before actually returning. Stack based buffer
1969 overflows (that need to overwrite this return address) now also
1970 overwrite the canary, which gets detected and the attack is then
1971 neutralized via a kernel panic.
1972 This feature requires gcc version 4.2 or above.
1979 bool "Xen guest support on ARM (EXPERIMENTAL)"
1980 depends on ARM && AEABI && OF
1981 depends on CPU_V7 && !CPU_V6
1982 depends on !GENERIC_ATOMIC64
1985 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1987 config ARM_FLUSH_CONSOLE_ON_RESTART
1988 bool "Force flush the console on restart"
1990 If the console is locked while the system is rebooted, the messages
1991 in the temporary logbuffer would not have propogated to all the
1992 console drivers. This option forces the console lock to be
1993 released if it failed to be acquired, which will cause all the
1994 pending messages to be flushed.
2001 bool "Flattened Device Tree support"
2004 select OF_EARLY_FLATTREE
2006 Include support for flattened device tree machine descriptions.
2009 bool "Support for the traditional ATAGS boot data passing" if USE_OF
2012 This is the traditional way of passing data to the kernel at boot
2013 time. If you are solely relying on the flattened device tree (or
2014 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
2015 to remove ATAGS support from your kernel binary. If unsure,
2018 config DEPRECATED_PARAM_STRUCT
2019 bool "Provide old way to pass kernel parameters"
2022 This was deprecated in 2001 and announced to live on for 5 years.
2023 Some old boot loaders still use this way.
2025 config BUILD_ARM_APPENDED_DTB_IMAGE
2026 bool "Build a concatenated zImage/dtb by default"
2029 Enabling this option will cause a concatenated zImage and DTB to
2030 be built by default (instead of a standalone zImage.) The image
2031 will built in arch/arm/boot/zImage-dtb.<dtb name>
2033 config BUILD_ARM_APPENDED_DTB_IMAGE_NAME
2034 string "Default dtb name"
2035 depends on BUILD_ARM_APPENDED_DTB_IMAGE
2037 name of the dtb to append when building a concatenated
2040 # Compressed boot loader in ROM. Yes, we really want to ask about
2041 # TEXT and BSS so we preserve their values in the config files.
2042 config ZBOOT_ROM_TEXT
2043 hex "Compressed ROM boot loader base address"
2046 The physical address at which the ROM-able zImage is to be
2047 placed in the target. Platforms which normally make use of
2048 ROM-able zImage formats normally set this to a suitable
2049 value in their defconfig file.
2051 If ZBOOT_ROM is not enabled, this has no effect.
2053 config ZBOOT_ROM_BSS
2054 hex "Compressed ROM boot loader BSS address"
2057 The base address of an area of read/write memory in the target
2058 for the ROM-able zImage which must be available while the
2059 decompressor is running. It must be large enough to hold the
2060 entire decompressed kernel plus an additional 128 KiB.
2061 Platforms which normally make use of ROM-able zImage formats
2062 normally set this to a suitable value in their defconfig file.
2064 If ZBOOT_ROM is not enabled, this has no effect.
2067 bool "Compressed boot loader in ROM/flash"
2068 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
2070 Say Y here if you intend to execute your compressed kernel image
2071 (zImage) directly from ROM or flash. If unsure, say N.
2074 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
2075 depends on ZBOOT_ROM && ARCH_SH7372
2076 default ZBOOT_ROM_NONE
2078 Include experimental SD/MMC loading code in the ROM-able zImage.
2079 With this enabled it is possible to write the ROM-able zImage
2080 kernel image to an MMC or SD card and boot the kernel straight
2081 from the reset vector. At reset the processor Mask ROM will load
2082 the first part of the ROM-able zImage which in turn loads the
2083 rest the kernel image to RAM.
2085 config ZBOOT_ROM_NONE
2086 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
2088 Do not load image from SD or MMC
2090 config ZBOOT_ROM_MMCIF
2091 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
2093 Load image from MMCIF hardware block.
2095 config ZBOOT_ROM_SH_MOBILE_SDHI
2096 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
2098 Load image from SDHI hardware block
2102 config ARM_APPENDED_DTB
2103 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
2104 depends on OF && !ZBOOT_ROM
2106 With this option, the boot code will look for a device tree binary
2107 (DTB) appended to zImage
2108 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
2110 This is meant as a backward compatibility convenience for those
2111 systems with a bootloader that can't be upgraded to accommodate
2112 the documented boot protocol using a device tree.
2114 Beware that there is very little in terms of protection against
2115 this option being confused by leftover garbage in memory that might
2116 look like a DTB header after a reboot if no actual DTB is appended
2117 to zImage. Do not leave this option active in a production kernel
2118 if you don't intend to always append a DTB. Proper passing of the
2119 location into r2 of a bootloader provided DTB is always preferable
2122 config ARM_ATAG_DTB_COMPAT
2123 bool "Supplement the appended DTB with traditional ATAG information"
2124 depends on ARM_APPENDED_DTB
2126 Some old bootloaders can't be updated to a DTB capable one, yet
2127 they provide ATAGs with memory configuration, the ramdisk address,
2128 the kernel cmdline string, etc. Such information is dynamically
2129 provided by the bootloader and can't always be stored in a static
2130 DTB. To allow a device tree enabled kernel to be used with such
2131 bootloaders, this option allows zImage to extract the information
2132 from the ATAG list and store it at run time into the appended DTB.
2135 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
2136 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2138 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2139 bool "Use bootloader kernel arguments if available"
2141 Uses the command-line options passed by the boot loader instead of
2142 the device tree bootargs property. If the boot loader doesn't provide
2143 any, the device tree bootargs property will be used.
2145 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
2146 bool "Extend with bootloader kernel arguments"
2148 The command-line arguments provided by the boot loader will be
2149 appended to the the device tree bootargs property.
2154 string "Default kernel command string"
2157 On some architectures (EBSA110 and CATS), there is currently no way
2158 for the boot loader to pass arguments to the kernel. For these
2159 architectures, you should supply some command-line options at build
2160 time by entering them here. As a minimum, you should specify the
2161 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2164 prompt "Kernel command line type" if CMDLINE != ""
2165 default CMDLINE_FROM_BOOTLOADER
2168 config CMDLINE_FROM_BOOTLOADER
2169 bool "Use bootloader kernel arguments if available"
2171 Uses the command-line options passed by the boot loader. If
2172 the boot loader doesn't provide any, the default kernel command
2173 string provided in CMDLINE will be used.
2175 config CMDLINE_EXTEND
2176 bool "Extend bootloader kernel arguments"
2178 The command-line arguments provided by the boot loader will be
2179 appended to the default kernel command string.
2181 config CMDLINE_FORCE
2182 bool "Always use the default kernel command string"
2184 Always use the default kernel command string, even if the boot
2185 loader passes other arguments to the kernel.
2186 This is useful if you cannot or don't want to change the
2187 command-line options your boot loader passes to the kernel.
2191 bool "Kernel Execute-In-Place from ROM"
2192 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2194 Execute-In-Place allows the kernel to run from non-volatile storage
2195 directly addressable by the CPU, such as NOR flash. This saves RAM
2196 space since the text section of the kernel is not loaded from flash
2197 to RAM. Read-write sections, such as the data section and stack,
2198 are still copied to RAM. The XIP kernel is not compressed since
2199 it has to run directly from flash, so it will take more space to
2200 store it. The flash address used to link the kernel object files,
2201 and for storing it, is configuration dependent. Therefore, if you
2202 say Y here, you must know the proper physical address where to
2203 store the kernel image depending on your own flash memory usage.
2205 Also note that the make target becomes "make xipImage" rather than
2206 "make zImage" or "make Image". The final kernel binary to put in
2207 ROM memory will be arch/arm/boot/xipImage.
2211 config XIP_PHYS_ADDR
2212 hex "XIP Kernel Physical Location"
2213 depends on XIP_KERNEL
2214 default "0x00080000"
2216 This is the physical address in your flash memory the kernel will
2217 be linked for and stored to. This address is dependent on your
2221 bool "Kexec system call (EXPERIMENTAL)"
2222 depends on (!SMP || PM_SLEEP_SMP)
2224 kexec is a system call that implements the ability to shutdown your
2225 current kernel, and to start another kernel. It is like a reboot
2226 but it is independent of the system firmware. And like a reboot
2227 you can start any kernel with it, not just Linux.
2229 It is an ongoing process to be certain the hardware in a machine
2230 is properly shutdown, so do not be surprised if this code does not
2231 initially work for you. It may help to enable device hotplugging
2235 bool "Export atags in procfs"
2236 depends on ATAGS && KEXEC
2239 Should the atags used to boot the kernel be exported in an "atags"
2240 file in procfs. Useful with kexec.
2243 bool "Build kdump crash kernel (EXPERIMENTAL)"
2245 Generate crash dump after being started by kexec. This should
2246 be normally only set in special crash dump kernels which are
2247 loaded in the main kernel with kexec-tools into a specially
2248 reserved region and then later executed after a crash by
2249 kdump/kexec. The crash dump kernel must be compiled to a
2250 memory address not used by the main kernel
2252 For more details see Documentation/kdump/kdump.txt
2254 config AUTO_ZRELADDR
2255 bool "Auto calculation of the decompressed kernel image address"
2256 depends on !ZBOOT_ROM && !ARCH_U300
2258 ZRELADDR is the physical address where the decompressed kernel
2259 image will be placed. If AUTO_ZRELADDR is selected, the address
2260 will be determined at run-time by masking the current IP with
2261 0xf8000000. This assumes the zImage being placed in the first 128MB
2262 from start of memory.
2266 menu "CPU Power Management"
2269 source "drivers/cpufreq/Kconfig"
2274 Internal configuration node for common cpufreq on Samsung SoC
2276 config CPU_FREQ_S3C24XX
2277 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2278 depends on ARCH_S3C24XX && CPU_FREQ
2281 This enables the CPUfreq driver for the Samsung S3C24XX family
2284 For details, take a look at <file:Documentation/cpu-freq>.
2288 config CPU_FREQ_S3C24XX_PLL
2289 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2290 depends on CPU_FREQ_S3C24XX
2292 Compile in support for changing the PLL frequency from the
2293 S3C24XX series CPUfreq driver. The PLL takes time to settle
2294 after a frequency change, so by default it is not enabled.
2296 This also means that the PLL tables for the selected CPU(s) will
2297 be built which may increase the size of the kernel image.
2299 config CPU_FREQ_S3C24XX_DEBUG
2300 bool "Debug CPUfreq Samsung driver core"
2301 depends on CPU_FREQ_S3C24XX
2303 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2305 config CPU_FREQ_S3C24XX_IODEBUG
2306 bool "Debug CPUfreq Samsung driver IO timing"
2307 depends on CPU_FREQ_S3C24XX
2309 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2311 config CPU_FREQ_S3C24XX_DEBUGFS
2312 bool "Export debugfs for CPUFreq"
2313 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2315 Export status information via debugfs.
2319 source "drivers/cpuidle/Kconfig"
2323 menu "Floating point emulation"
2325 comment "At least one emulation must be selected"
2328 bool "NWFPE math emulation"
2329 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2331 Say Y to include the NWFPE floating point emulator in the kernel.
2332 This is necessary to run most binaries. Linux does not currently
2333 support floating point hardware so you need to say Y here even if
2334 your machine has an FPA or floating point co-processor podule.
2336 You may say N here if you are going to load the Acorn FPEmulator
2337 early in the bootup.
2340 bool "Support extended precision"
2341 depends on FPE_NWFPE
2343 Say Y to include 80-bit support in the kernel floating-point
2344 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2345 Note that gcc does not generate 80-bit operations by default,
2346 so in most cases this option only enlarges the size of the
2347 floating point emulator without any good reason.
2349 You almost surely want to say N here.
2352 bool "FastFPE math emulation (EXPERIMENTAL)"
2353 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2355 Say Y here to include the FAST floating point emulator in the kernel.
2356 This is an experimental much faster emulator which now also has full
2357 precision for the mantissa. It does not support any exceptions.
2358 It is very simple, and approximately 3-6 times faster than NWFPE.
2360 It should be sufficient for most programs. It may be not suitable
2361 for scientific calculations, but you have to check this for yourself.
2362 If you do not feel you need a faster FP emulation you should better
2366 bool "VFP-format floating point maths"
2367 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2369 Say Y to include VFP support code in the kernel. This is needed
2370 if your hardware includes a VFP unit.
2372 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2373 release notes and additional status information.
2375 Say N if your target does not have VFP hardware.
2383 bool "Advanced SIMD (NEON) Extension support"
2384 depends on VFPv3 && CPU_V7
2386 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2391 menu "Userspace binary formats"
2393 source "fs/Kconfig.binfmt"
2396 tristate "RISC OS personality"
2399 Say Y here to include the kernel code necessary if you want to run
2400 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2401 experimental; if this sounds frightening, say N and sleep in peace.
2402 You can also say M here to compile this support as a module (which
2403 will be called arthur).
2407 menu "Power management options"
2409 source "kernel/power/Kconfig"
2411 config ARCH_SUSPEND_POSSIBLE
2412 depends on !ARCH_S5PC100
2413 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2414 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2417 config ARM_CPU_SUSPEND
2422 source "net/Kconfig"
2424 source "drivers/Kconfig"
2428 source "arch/arm/Kconfig.debug"
2430 source "security/Kconfig"
2432 source "crypto/Kconfig"
2434 source "lib/Kconfig"
2436 source "arch/arm/kvm/Kconfig"