4 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
5 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
6 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
7 select ARCH_HAVE_CUSTOM_GPIO_H
8 select ARCH_HAS_GCOV_PROFILE_ALL
9 select ARCH_MIGHT_HAVE_PC_PARPORT
10 select ARCH_SUPPORTS_ATOMIC_RMW
11 select ARCH_USE_BUILTIN_BSWAP
12 select ARCH_USE_CMPXCHG_LOCKREF
13 select ARCH_WANT_IPC_PARSE_VERSION
14 select BUILDTIME_EXTABLE_SORT if MMU
15 select CLONE_BACKWARDS
16 select CPU_PM if (SUSPEND || CPU_IDLE)
17 select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
18 select GENERIC_ALLOCATOR
19 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
20 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
21 select GENERIC_IDLE_POLL_SETUP
22 select GENERIC_IRQ_PROBE
23 select GENERIC_IRQ_SHOW
24 select GENERIC_PCI_IOMAP
25 select GENERIC_SCHED_CLOCK
26 select GENERIC_SMP_IDLE_THREAD
27 select GENERIC_STRNCPY_FROM_USER
28 select GENERIC_STRNLEN_USER
29 select HANDLE_DOMAIN_IRQ
30 select HARDIRQS_SW_RESEND
31 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
32 select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
33 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
35 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
36 select HAVE_ARCH_TRACEHOOK
38 select HAVE_CC_STACKPROTECTOR
39 select HAVE_CONTEXT_TRACKING
40 select HAVE_C_RECORDMCOUNT
41 select HAVE_DEBUG_KMEMLEAK
42 select HAVE_DMA_API_DEBUG
44 select HAVE_DMA_CONTIGUOUS if MMU
45 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
46 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
47 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
48 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
49 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
50 select HAVE_GENERIC_DMA_COHERENT
51 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
52 select HAVE_IDE if PCI || ISA || PCMCIA
53 select HAVE_IRQ_TIME_ACCOUNTING
54 select HAVE_KERNEL_GZIP
55 select HAVE_KERNEL_LZ4
56 select HAVE_KERNEL_LZMA
57 select HAVE_KERNEL_LZO
59 select HAVE_KPROBES if !XIP_KERNEL
60 select HAVE_KRETPROBES if (HAVE_KPROBES)
62 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
63 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
64 select HAVE_OPTPROBES if !THUMB2_KERNEL
65 select HAVE_PERF_EVENTS
67 select HAVE_PERF_USER_STACK_DUMP
68 select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
69 select HAVE_REGS_AND_STACK_ACCESS_API
70 select HAVE_SYSCALL_TRACEPOINTS
72 select HAVE_VIRT_CPU_ACCOUNTING_GEN
73 select IRQ_FORCED_THREADING
74 select MODULES_USE_ELF_REL
77 select OLD_SIGSUSPEND3
78 select PERF_USE_VMALLOC
80 select SYS_SUPPORTS_APM_EMULATION
81 # Above selects are sorted alphabetically; please add new ones
82 # according to that. Thanks.
84 The ARM series is a line of low-power-consumption RISC chip designs
85 licensed by ARM Ltd and targeted at embedded applications and
86 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
87 manufactured, but legacy ARM-based PC hardware remains popular in
88 Europe. There is an ARM Linux project with a web page at
89 <http://www.arm.linux.org.uk/>.
91 config ARM_HAS_SG_CHAIN
92 select ARCH_HAS_SG_CHAIN
95 config NEED_SG_DMA_LENGTH
98 config ARM_DMA_USE_IOMMU
100 select ARM_HAS_SG_CHAIN
101 select NEED_SG_DMA_LENGTH
105 config ARM_DMA_IOMMU_ALIGNMENT
106 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
110 DMA mapping framework by default aligns all buffers to the smallest
111 PAGE_SIZE order which is greater than or equal to the requested buffer
112 size. This works well for buffers up to a few hundreds kilobytes, but
113 for larger buffers it just a waste of address space. Drivers which has
114 relatively small addressing window (like 64Mib) might run out of
115 virtual space with just a few allocations.
117 With this parameter you can specify the maximum PAGE_SIZE order for
118 DMA IOMMU buffers. Larger buffers will be aligned only to this
119 specified order. The order is expressed as a power of two multiplied
124 config MIGHT_HAVE_PCI
127 config SYS_SUPPORTS_APM_EMULATION
132 select GENERIC_ALLOCATOR
143 The Extended Industry Standard Architecture (EISA) bus was
144 developed as an open alternative to the IBM MicroChannel bus.
146 The EISA bus provided some of the features of the IBM MicroChannel
147 bus while maintaining backward compatibility with cards made for
148 the older ISA bus. The EISA bus saw limited use between 1988 and
149 1995 when it was made obsolete by the PCI bus.
151 Say Y here if you are building a kernel for an EISA-based machine.
158 config STACKTRACE_SUPPORT
162 config HAVE_LATENCYTOP_SUPPORT
167 config LOCKDEP_SUPPORT
171 config TRACE_IRQFLAGS_SUPPORT
175 config RWSEM_XCHGADD_ALGORITHM
179 config ARCH_HAS_ILOG2_U32
182 config ARCH_HAS_ILOG2_U64
185 config ARCH_HAS_BANDGAP
188 config GENERIC_HWEIGHT
192 config GENERIC_CALIBRATE_DELAY
196 config ARCH_MAY_HAVE_PC_FDC
202 config NEED_DMA_MAP_STATE
205 config ARCH_SUPPORTS_UPROBES
208 config ARCH_HAS_DMA_SET_COHERENT_MASK
211 config GENERIC_ISA_DMA
217 config NEED_RET_TO_USER
225 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
226 default DRAM_BASE if REMAP_VECTORS_TO_RAM
229 The base address of exception vectors. This must be two pages
232 config ARM_PATCH_PHYS_VIRT
233 bool "Patch physical to virtual translations at runtime" if EMBEDDED
235 depends on !XIP_KERNEL && MMU
236 depends on !ARCH_REALVIEW || !SPARSEMEM
238 Patch phys-to-virt and virt-to-phys translation functions at
239 boot and module load time according to the position of the
240 kernel in system memory.
242 This can only be used with non-XIP MMU kernels where the base
243 of physical memory is at a 16MB boundary.
245 Only disable this option if you know that you do not require
246 this feature (eg, building a kernel for a single machine) and
247 you need to shrink the kernel to the minimal size.
249 config NEED_MACH_IO_H
252 Select this when mach/io.h is required to provide special
253 definitions for this platform. The need for mach/io.h should
254 be avoided when possible.
256 config NEED_MACH_MEMORY_H
259 Select this when mach/memory.h is required to provide special
260 definitions for this platform. The need for mach/memory.h should
261 be avoided when possible.
264 hex "Physical address of main memory" if MMU
265 depends on !ARM_PATCH_PHYS_VIRT
266 default DRAM_BASE if !MMU
267 default 0x00000000 if ARCH_EBSA110 || \
268 EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
273 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
274 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
275 default 0x20000000 if ARCH_S5PV210
276 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
277 default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
278 default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
279 default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
280 default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
282 Please provide the physical address corresponding to the
283 location of main memory in your system.
289 source "init/Kconfig"
291 source "kernel/Kconfig.freezer"
296 bool "MMU-based Paged Memory Management Support"
299 Select if you want MMU-based virtualised addressing space
300 support by paged memory management. If unsure, say 'Y'.
303 # The "ARM system type" choice list is ordered alphabetically by option
304 # text. Please add new entries in the option alphabetic order.
307 prompt "ARM system type"
308 default ARCH_VERSATILE if !MMU
309 default ARCH_MULTIPLATFORM if MMU
311 config ARCH_MULTIPLATFORM
312 bool "Allow multiple platforms to be selected"
314 select ARCH_WANT_OPTIONAL_GPIOLIB
315 select ARM_HAS_SG_CHAIN
316 select ARM_PATCH_PHYS_VIRT
320 select GENERIC_CLOCKEVENTS
321 select MIGHT_HAVE_PCI
322 select MULTI_IRQ_HANDLER
327 bool "ARM Ltd. RealView family"
328 select ARCH_WANT_OPTIONAL_GPIOLIB
330 select ARM_TIMER_SP804
332 select COMMON_CLK_VERSATILE
333 select GENERIC_CLOCKEVENTS
334 select GPIO_PL061 if GPIOLIB
336 select NEED_MACH_MEMORY_H
337 select PLAT_VERSATILE
338 select PLAT_VERSATILE_SCHED_CLOCK
340 This enables support for ARM Ltd RealView boards.
342 config ARCH_VERSATILE
343 bool "ARM Ltd. Versatile family"
344 select ARCH_WANT_OPTIONAL_GPIOLIB
346 select ARM_TIMER_SP804
349 select GENERIC_CLOCKEVENTS
350 select HAVE_MACH_CLKDEV
352 select PLAT_VERSATILE
353 select PLAT_VERSATILE_CLOCK
354 select PLAT_VERSATILE_SCHED_CLOCK
355 select VERSATILE_FPGA_IRQ
357 This enables support for ARM Ltd Versatile board.
361 select ARCH_REQUIRE_GPIOLIB
364 select NEED_MACH_IO_H if PCCARD
369 This enables support for systems based on Atmel
370 AT91RM9200, AT91SAM9 and SAMA5 processors.
373 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
374 select ARCH_REQUIRE_GPIOLIB
379 select GENERIC_CLOCKEVENTS
383 Support for Cirrus Logic 711x/721x/731x based boards.
386 bool "Cortina Systems Gemini"
387 select ARCH_REQUIRE_GPIOLIB
390 select GENERIC_CLOCKEVENTS
392 Support for the Cortina Systems Gemini family SoCs
396 select ARCH_USES_GETTIMEOFFSET
399 select NEED_MACH_IO_H
400 select NEED_MACH_MEMORY_H
403 This is an evaluation board for the StrongARM processor available
404 from Digital. It has limited hardware on-board, including an
405 Ethernet interface, two PCMCIA sockets, two serial ports and a
409 bool "Energy Micro efm32"
411 select ARCH_REQUIRE_GPIOLIB
417 select GENERIC_CLOCKEVENTS
423 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
428 select ARCH_HAS_HOLES_MEMORYMODEL
429 select ARCH_REQUIRE_GPIOLIB
430 select ARCH_USES_GETTIMEOFFSET
436 This enables support for the Cirrus EP93xx series of CPUs.
438 config ARCH_FOOTBRIDGE
442 select GENERIC_CLOCKEVENTS
444 select NEED_MACH_IO_H if !MMU
445 select NEED_MACH_MEMORY_H
447 Support for systems based on the DC21285 companion chip
448 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
451 bool "Hilscher NetX based"
455 select GENERIC_CLOCKEVENTS
457 This enables support for systems based on the Hilscher NetX Soc
463 select NEED_MACH_MEMORY_H
464 select NEED_RET_TO_USER
470 Support for Intel's IOP13XX (XScale) family of processors.
475 select ARCH_REQUIRE_GPIOLIB
478 select NEED_RET_TO_USER
482 Support for Intel's 80219 and IOP32X (XScale) family of
488 select ARCH_REQUIRE_GPIOLIB
491 select NEED_RET_TO_USER
495 Support for Intel's IOP33X (XScale) family of processors.
500 select ARCH_HAS_DMA_SET_COHERENT_MASK
501 select ARCH_REQUIRE_GPIOLIB
502 select ARCH_SUPPORTS_BIG_ENDIAN
505 select DMABOUNCE if PCI
506 select GENERIC_CLOCKEVENTS
507 select MIGHT_HAVE_PCI
508 select NEED_MACH_IO_H
509 select USB_EHCI_BIG_ENDIAN_DESC
510 select USB_EHCI_BIG_ENDIAN_MMIO
512 Support for Intel's IXP4XX (XScale) family of processors.
516 select ARCH_REQUIRE_GPIOLIB
518 select GENERIC_CLOCKEVENTS
519 select MIGHT_HAVE_PCI
523 select PLAT_ORION_LEGACY
525 Support for the Marvell Dove SoC 88AP510
528 bool "Marvell MV78xx0"
529 select ARCH_REQUIRE_GPIOLIB
531 select GENERIC_CLOCKEVENTS
534 select PLAT_ORION_LEGACY
536 Support for the following Marvell MV78xx0 series SoCs:
542 select ARCH_REQUIRE_GPIOLIB
544 select GENERIC_CLOCKEVENTS
547 select PLAT_ORION_LEGACY
549 Support for the following Marvell Orion 5x series SoCs:
550 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
551 Orion-2 (5281), Orion-1-90 (6183).
554 bool "Marvell PXA168/910/MMP2"
556 select ARCH_REQUIRE_GPIOLIB
558 select GENERIC_ALLOCATOR
559 select GENERIC_CLOCKEVENTS
562 select MULTI_IRQ_HANDLER
567 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
570 bool "Micrel/Kendin KS8695"
571 select ARCH_REQUIRE_GPIOLIB
574 select GENERIC_CLOCKEVENTS
575 select NEED_MACH_MEMORY_H
577 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
578 System-on-Chip devices.
581 bool "Nuvoton W90X900 CPU"
582 select ARCH_REQUIRE_GPIOLIB
586 select GENERIC_CLOCKEVENTS
588 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
589 At present, the w90x900 has been renamed nuc900, regarding
590 the ARM series product line, you can login the following
591 link address to know more.
593 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
594 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
598 select ARCH_REQUIRE_GPIOLIB
603 select GENERIC_CLOCKEVENTS
607 Support for the NXP LPC32XX family of processors
610 bool "PXA2xx/PXA3xx-based"
613 select ARCH_REQUIRE_GPIOLIB
614 select ARM_CPU_SUSPEND if PM
619 select GENERIC_CLOCKEVENTS
622 select MULTI_IRQ_HANDLER
626 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
629 bool "Qualcomm MSM (non-multiplatform)"
630 select ARCH_REQUIRE_GPIOLIB
632 select GENERIC_CLOCKEVENTS
634 Support for Qualcomm MSM/QSD based systems. This runs on the
635 apps processor of the MSM/QSD and depends on a shared memory
636 interface to the modem processor which runs the baseband
637 stack and controls some vital subsystems
638 (clock and power control, etc).
640 config ARCH_SHMOBILE_LEGACY
641 bool "Renesas ARM SoCs (non-multiplatform)"
643 select ARM_PATCH_PHYS_VIRT if MMU
646 select GENERIC_CLOCKEVENTS
647 select HAVE_ARM_SCU if SMP
648 select HAVE_ARM_TWD if SMP
649 select HAVE_MACH_CLKDEV
651 select MIGHT_HAVE_CACHE_L2X0
652 select MULTI_IRQ_HANDLER
655 select PM_GENERIC_DOMAINS if PM
659 Support for Renesas ARM SoC platforms using a non-multiplatform
660 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
666 select ARCH_MAY_HAVE_PC_FDC
667 select ARCH_SPARSEMEM_ENABLE
668 select ARCH_USES_GETTIMEOFFSET
672 select HAVE_PATA_PLATFORM
674 select NEED_MACH_IO_H
675 select NEED_MACH_MEMORY_H
679 On the Acorn Risc-PC, Linux can support the internal IDE disk and
680 CD-ROM interface, serial and parallel port, and the floppy drive.
685 select ARCH_REQUIRE_GPIOLIB
686 select ARCH_SPARSEMEM_ENABLE
691 select GENERIC_CLOCKEVENTS
695 select MULTI_IRQ_HANDLER
696 select NEED_MACH_MEMORY_H
699 Support for StrongARM 11x0 based boards.
702 bool "Samsung S3C24XX SoCs"
703 select ARCH_REQUIRE_GPIOLIB
706 select CLKSRC_SAMSUNG_PWM
707 select GENERIC_CLOCKEVENTS
709 select HAVE_S3C2410_I2C if I2C
710 select HAVE_S3C2410_WATCHDOG if WATCHDOG
711 select HAVE_S3C_RTC if RTC_CLASS
712 select MULTI_IRQ_HANDLER
713 select NEED_MACH_IO_H
716 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
717 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
718 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
719 Samsung SMDK2410 development board (and derivatives).
722 bool "Samsung S3C64XX"
723 select ARCH_REQUIRE_GPIOLIB
728 select CLKSRC_SAMSUNG_PWM
729 select COMMON_CLK_SAMSUNG
731 select GENERIC_CLOCKEVENTS
733 select HAVE_S3C2410_I2C if I2C
734 select HAVE_S3C2410_WATCHDOG if WATCHDOG
738 select PM_GENERIC_DOMAINS if PM
740 select S3C_GPIO_TRACK
742 select SAMSUNG_WAKEMASK
743 select SAMSUNG_WDT_RESET
745 Samsung S3C64XX series based systems
749 select ARCH_HAS_HOLES_MEMORYMODEL
750 select ARCH_REQUIRE_GPIOLIB
752 select GENERIC_ALLOCATOR
753 select GENERIC_CLOCKEVENTS
754 select GENERIC_IRQ_CHIP
760 Support for TI's DaVinci platform.
765 select ARCH_HAS_HOLES_MEMORYMODEL
767 select ARCH_REQUIRE_GPIOLIB
770 select GENERIC_CLOCKEVENTS
771 select GENERIC_IRQ_CHIP
774 select NEED_MACH_IO_H if PCCARD
775 select NEED_MACH_MEMORY_H
777 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
781 menu "Multiple platform selection"
782 depends on ARCH_MULTIPLATFORM
784 comment "CPU Core family selection"
787 bool "ARMv4 based platforms (FA526)"
788 depends on !ARCH_MULTI_V6_V7
789 select ARCH_MULTI_V4_V5
792 config ARCH_MULTI_V4T
793 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
794 depends on !ARCH_MULTI_V6_V7
795 select ARCH_MULTI_V4_V5
796 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
797 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
798 CPU_ARM925T || CPU_ARM940T)
801 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
802 depends on !ARCH_MULTI_V6_V7
803 select ARCH_MULTI_V4_V5
804 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
805 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
806 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
808 config ARCH_MULTI_V4_V5
812 bool "ARMv6 based platforms (ARM11)"
813 select ARCH_MULTI_V6_V7
817 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
819 select ARCH_MULTI_V6_V7
823 config ARCH_MULTI_V6_V7
825 select MIGHT_HAVE_CACHE_L2X0
827 config ARCH_MULTI_CPU_AUTO
828 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
834 bool "Dummy Virtual Machine" if ARCH_MULTI_V7
838 select HAVE_ARM_ARCH_TIMER
841 # This is sorted alphabetically by mach-* pathname. However, plat-*
842 # Kconfigs may be included either alphabetically (according to the
843 # plat- suffix) or along side the corresponding mach-* source.
845 source "arch/arm/mach-mvebu/Kconfig"
847 source "arch/arm/mach-asm9260/Kconfig"
849 source "arch/arm/mach-at91/Kconfig"
851 source "arch/arm/mach-axxia/Kconfig"
853 source "arch/arm/mach-bcm/Kconfig"
855 source "arch/arm/mach-berlin/Kconfig"
857 source "arch/arm/mach-clps711x/Kconfig"
859 source "arch/arm/mach-cns3xxx/Kconfig"
861 source "arch/arm/mach-davinci/Kconfig"
863 source "arch/arm/mach-dove/Kconfig"
865 source "arch/arm/mach-ep93xx/Kconfig"
867 source "arch/arm/mach-footbridge/Kconfig"
869 source "arch/arm/mach-gemini/Kconfig"
871 source "arch/arm/mach-highbank/Kconfig"
873 source "arch/arm/mach-hisi/Kconfig"
875 source "arch/arm/mach-integrator/Kconfig"
877 source "arch/arm/mach-iop32x/Kconfig"
879 source "arch/arm/mach-iop33x/Kconfig"
881 source "arch/arm/mach-iop13xx/Kconfig"
883 source "arch/arm/mach-ixp4xx/Kconfig"
885 source "arch/arm/mach-keystone/Kconfig"
887 source "arch/arm/mach-ks8695/Kconfig"
889 source "arch/arm/mach-meson/Kconfig"
891 source "arch/arm/mach-msm/Kconfig"
893 source "arch/arm/mach-moxart/Kconfig"
895 source "arch/arm/mach-mv78xx0/Kconfig"
897 source "arch/arm/mach-imx/Kconfig"
899 source "arch/arm/mach-mediatek/Kconfig"
901 source "arch/arm/mach-mxs/Kconfig"
903 source "arch/arm/mach-netx/Kconfig"
905 source "arch/arm/mach-nomadik/Kconfig"
907 source "arch/arm/mach-nspire/Kconfig"
909 source "arch/arm/plat-omap/Kconfig"
911 source "arch/arm/mach-omap1/Kconfig"
913 source "arch/arm/mach-omap2/Kconfig"
915 source "arch/arm/mach-orion5x/Kconfig"
917 source "arch/arm/mach-picoxcell/Kconfig"
919 source "arch/arm/mach-pxa/Kconfig"
920 source "arch/arm/plat-pxa/Kconfig"
922 source "arch/arm/mach-mmp/Kconfig"
924 source "arch/arm/mach-qcom/Kconfig"
926 source "arch/arm/mach-realview/Kconfig"
928 source "arch/arm/mach-rockchip/Kconfig"
930 source "arch/arm/mach-sa1100/Kconfig"
932 source "arch/arm/mach-socfpga/Kconfig"
934 source "arch/arm/mach-spear/Kconfig"
936 source "arch/arm/mach-sti/Kconfig"
938 source "arch/arm/mach-s3c24xx/Kconfig"
940 source "arch/arm/mach-s3c64xx/Kconfig"
942 source "arch/arm/mach-s5pv210/Kconfig"
944 source "arch/arm/mach-exynos/Kconfig"
945 source "arch/arm/plat-samsung/Kconfig"
947 source "arch/arm/mach-shmobile/Kconfig"
949 source "arch/arm/mach-sunxi/Kconfig"
951 source "arch/arm/mach-prima2/Kconfig"
953 source "arch/arm/mach-tegra/Kconfig"
955 source "arch/arm/mach-u300/Kconfig"
957 source "arch/arm/mach-ux500/Kconfig"
959 source "arch/arm/mach-versatile/Kconfig"
961 source "arch/arm/mach-vexpress/Kconfig"
962 source "arch/arm/plat-versatile/Kconfig"
964 source "arch/arm/mach-vt8500/Kconfig"
966 source "arch/arm/mach-w90x900/Kconfig"
968 source "arch/arm/mach-zynq/Kconfig"
970 # Definitions to make life easier
976 select GENERIC_CLOCKEVENTS
982 select GENERIC_IRQ_CHIP
985 config PLAT_ORION_LEGACY
992 config PLAT_VERSATILE
995 config ARM_TIMER_SP804
998 select CLKSRC_OF if OF
1000 source "arch/arm/firmware/Kconfig"
1002 source arch/arm/mm/Kconfig
1005 bool "Enable iWMMXt support"
1006 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1007 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1009 Enable support for iWMMXt context switching at run time if
1010 running on a CPU that supports it.
1012 config MULTI_IRQ_HANDLER
1015 Allow each machine to specify it's own IRQ handler at run time.
1018 source "arch/arm/Kconfig-nommu"
1021 config PJ4B_ERRATA_4742
1022 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1023 depends on CPU_PJ4B && MACH_ARMADA_370
1026 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1027 Event (WFE) IDLE states, a specific timing sensitivity exists between
1028 the retiring WFI/WFE instructions and the newly issued subsequent
1029 instructions. This sensitivity can result in a CPU hang scenario.
1031 The software must insert either a Data Synchronization Barrier (DSB)
1032 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1035 config ARM_ERRATA_326103
1036 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1039 Executing a SWP instruction to read-only memory does not set bit 11
1040 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1041 treat the access as a read, preventing a COW from occurring and
1042 causing the faulting task to livelock.
1044 config ARM_ERRATA_411920
1045 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1046 depends on CPU_V6 || CPU_V6K
1048 Invalidation of the Instruction Cache operation can
1049 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1050 It does not affect the MPCore. This option enables the ARM Ltd.
1051 recommended workaround.
1053 config ARM_ERRATA_430973
1054 bool "ARM errata: Stale prediction on replaced interworking branch"
1057 This option enables the workaround for the 430973 Cortex-A8
1058 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1059 interworking branch is replaced with another code sequence at the
1060 same virtual address, whether due to self-modifying code or virtual
1061 to physical address re-mapping, Cortex-A8 does not recover from the
1062 stale interworking branch prediction. This results in Cortex-A8
1063 executing the new code sequence in the incorrect ARM or Thumb state.
1064 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1065 and also flushes the branch target cache at every context switch.
1066 Note that setting specific bits in the ACTLR register may not be
1067 available in non-secure mode.
1069 config ARM_ERRATA_458693
1070 bool "ARM errata: Processor deadlock when a false hazard is created"
1072 depends on !ARCH_MULTIPLATFORM
1074 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1075 erratum. For very specific sequences of memory operations, it is
1076 possible for a hazard condition intended for a cache line to instead
1077 be incorrectly associated with a different cache line. This false
1078 hazard might then cause a processor deadlock. The workaround enables
1079 the L1 caching of the NEON accesses and disables the PLD instruction
1080 in the ACTLR register. Note that setting specific bits in the ACTLR
1081 register may not be available in non-secure mode.
1083 config ARM_ERRATA_460075
1084 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1086 depends on !ARCH_MULTIPLATFORM
1088 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1089 erratum. Any asynchronous access to the L2 cache may encounter a
1090 situation in which recent store transactions to the L2 cache are lost
1091 and overwritten with stale memory contents from external memory. The
1092 workaround disables the write-allocate mode for the L2 cache via the
1093 ACTLR register. Note that setting specific bits in the ACTLR register
1094 may not be available in non-secure mode.
1096 config ARM_ERRATA_742230
1097 bool "ARM errata: DMB operation may be faulty"
1098 depends on CPU_V7 && SMP
1099 depends on !ARCH_MULTIPLATFORM
1101 This option enables the workaround for the 742230 Cortex-A9
1102 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1103 between two write operations may not ensure the correct visibility
1104 ordering of the two writes. This workaround sets a specific bit in
1105 the diagnostic register of the Cortex-A9 which causes the DMB
1106 instruction to behave as a DSB, ensuring the correct behaviour of
1109 config ARM_ERRATA_742231
1110 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1111 depends on CPU_V7 && SMP
1112 depends on !ARCH_MULTIPLATFORM
1114 This option enables the workaround for the 742231 Cortex-A9
1115 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1116 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1117 accessing some data located in the same cache line, may get corrupted
1118 data due to bad handling of the address hazard when the line gets
1119 replaced from one of the CPUs at the same time as another CPU is
1120 accessing it. This workaround sets specific bits in the diagnostic
1121 register of the Cortex-A9 which reduces the linefill issuing
1122 capabilities of the processor.
1124 config ARM_ERRATA_643719
1125 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1126 depends on CPU_V7 && SMP
1128 This option enables the workaround for the 643719 Cortex-A9 (prior to
1129 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1130 register returns zero when it should return one. The workaround
1131 corrects this value, ensuring cache maintenance operations which use
1132 it behave as intended and avoiding data corruption.
1134 config ARM_ERRATA_720789
1135 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1138 This option enables the workaround for the 720789 Cortex-A9 (prior to
1139 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1140 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1141 As a consequence of this erratum, some TLB entries which should be
1142 invalidated are not, resulting in an incoherency in the system page
1143 tables. The workaround changes the TLB flushing routines to invalidate
1144 entries regardless of the ASID.
1146 config ARM_ERRATA_743622
1147 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1149 depends on !ARCH_MULTIPLATFORM
1151 This option enables the workaround for the 743622 Cortex-A9
1152 (r2p*) erratum. Under very rare conditions, a faulty
1153 optimisation in the Cortex-A9 Store Buffer may lead to data
1154 corruption. This workaround sets a specific bit in the diagnostic
1155 register of the Cortex-A9 which disables the Store Buffer
1156 optimisation, preventing the defect from occurring. This has no
1157 visible impact on the overall performance or power consumption of the
1160 config ARM_ERRATA_751472
1161 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1163 depends on !ARCH_MULTIPLATFORM
1165 This option enables the workaround for the 751472 Cortex-A9 (prior
1166 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1167 completion of a following broadcasted operation if the second
1168 operation is received by a CPU before the ICIALLUIS has completed,
1169 potentially leading to corrupted entries in the cache or TLB.
1171 config ARM_ERRATA_754322
1172 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1175 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1176 r3p*) erratum. A speculative memory access may cause a page table walk
1177 which starts prior to an ASID switch but completes afterwards. This
1178 can populate the micro-TLB with a stale entry which may be hit with
1179 the new ASID. This workaround places two dsb instructions in the mm
1180 switching code so that no page table walks can cross the ASID switch.
1182 config ARM_ERRATA_754327
1183 bool "ARM errata: no automatic Store Buffer drain"
1184 depends on CPU_V7 && SMP
1186 This option enables the workaround for the 754327 Cortex-A9 (prior to
1187 r2p0) erratum. The Store Buffer does not have any automatic draining
1188 mechanism and therefore a livelock may occur if an external agent
1189 continuously polls a memory location waiting to observe an update.
1190 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1191 written polling loops from denying visibility of updates to memory.
1193 config ARM_ERRATA_364296
1194 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1197 This options enables the workaround for the 364296 ARM1136
1198 r0p2 erratum (possible cache data corruption with
1199 hit-under-miss enabled). It sets the undocumented bit 31 in
1200 the auxiliary control register and the FI bit in the control
1201 register, thus disabling hit-under-miss without putting the
1202 processor into full low interrupt latency mode. ARM11MPCore
1205 config ARM_ERRATA_764369
1206 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1207 depends on CPU_V7 && SMP
1209 This option enables the workaround for erratum 764369
1210 affecting Cortex-A9 MPCore with two or more processors (all
1211 current revisions). Under certain timing circumstances, a data
1212 cache line maintenance operation by MVA targeting an Inner
1213 Shareable memory region may fail to proceed up to either the
1214 Point of Coherency or to the Point of Unification of the
1215 system. This workaround adds a DSB instruction before the
1216 relevant cache maintenance functions and sets a specific bit
1217 in the diagnostic control register of the SCU.
1219 config ARM_ERRATA_775420
1220 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1223 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1224 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1225 operation aborts with MMU exception, it might cause the processor
1226 to deadlock. This workaround puts DSB before executing ISB if
1227 an abort may occur on cache maintenance.
1229 config ARM_ERRATA_798181
1230 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1231 depends on CPU_V7 && SMP
1233 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1234 adequately shooting down all use of the old entries. This
1235 option enables the Linux kernel workaround for this erratum
1236 which sends an IPI to the CPUs that are running the same ASID
1237 as the one being invalidated.
1239 config ARM_ERRATA_773022
1240 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1243 This option enables the workaround for the 773022 Cortex-A15
1244 (up to r0p4) erratum. In certain rare sequences of code, the
1245 loop buffer may deliver incorrect instructions. This
1246 workaround disables the loop buffer to avoid the erratum.
1250 source "arch/arm/common/Kconfig"
1257 Find out whether you have ISA slots on your motherboard. ISA is the
1258 name of a bus system, i.e. the way the CPU talks to the other stuff
1259 inside your box. Other bus systems are PCI, EISA, MicroChannel
1260 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1261 newer boards don't support it. If you have ISA, say Y, otherwise N.
1263 # Select ISA DMA controller support
1268 # Select ISA DMA interface
1273 bool "PCI support" if MIGHT_HAVE_PCI
1275 Find out whether you have a PCI motherboard. PCI is the name of a
1276 bus system, i.e. the way the CPU talks to the other stuff inside
1277 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1278 VESA. If you have PCI, say Y, otherwise N.
1284 config PCI_DOMAINS_GENERIC
1285 def_bool PCI_DOMAINS
1287 config PCI_NANOENGINE
1288 bool "BSE nanoEngine PCI support"
1289 depends on SA1100_NANOENGINE
1291 Enable PCI on the BSE nanoEngine board.
1296 config PCI_HOST_ITE8152
1298 depends on PCI && MACH_ARMCORE
1302 source "drivers/pci/Kconfig"
1303 source "drivers/pci/pcie/Kconfig"
1305 source "drivers/pcmcia/Kconfig"
1309 menu "Kernel Features"
1314 This option should be selected by machines which have an SMP-
1317 The only effect of this option is to make the SMP-related
1318 options available to the user for configuration.
1321 bool "Symmetric Multi-Processing"
1322 depends on CPU_V6K || CPU_V7
1323 depends on GENERIC_CLOCKEVENTS
1325 depends on MMU || ARM_MPU
1327 This enables support for systems with more than one CPU. If you have
1328 a system with only one CPU, say N. If you have a system with more
1329 than one CPU, say Y.
1331 If you say N here, the kernel will run on uni- and multiprocessor
1332 machines, but will use only one CPU of a multiprocessor machine. If
1333 you say Y here, the kernel will run on many, but not all,
1334 uniprocessor machines. On a uniprocessor machine, the kernel
1335 will run faster if you say N here.
1337 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1338 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1339 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1341 If you don't know what to do here, say N.
1344 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1345 depends on SMP && !XIP_KERNEL && MMU
1348 SMP kernels contain instructions which fail on non-SMP processors.
1349 Enabling this option allows the kernel to modify itself to make
1350 these instructions safe. Disabling it allows about 1K of space
1353 If you don't know what to do here, say Y.
1355 config ARM_CPU_TOPOLOGY
1356 bool "Support cpu topology definition"
1357 depends on SMP && CPU_V7
1360 Support ARM cpu topology definition. The MPIDR register defines
1361 affinity between processors which is then used to describe the cpu
1362 topology of an ARM System.
1365 bool "Multi-core scheduler support"
1366 depends on ARM_CPU_TOPOLOGY
1368 Multi-core scheduler support improves the CPU scheduler's decision
1369 making when dealing with multi-core CPU chips at a cost of slightly
1370 increased overhead in some places. If unsure say N here.
1373 bool "SMT scheduler support"
1374 depends on ARM_CPU_TOPOLOGY
1376 Improves the CPU scheduler's decision making when dealing with
1377 MultiThreading at a cost of slightly increased overhead in some
1378 places. If unsure say N here.
1383 This option enables support for the ARM system coherency unit
1385 config HAVE_ARM_ARCH_TIMER
1386 bool "Architected timer support"
1388 select ARM_ARCH_TIMER
1389 select GENERIC_CLOCKEVENTS
1391 This option enables support for the ARM architected timer
1396 select CLKSRC_OF if OF
1398 This options enables support for the ARM timer and watchdog unit
1401 bool "Multi-Cluster Power Management"
1402 depends on CPU_V7 && SMP
1404 This option provides the common power management infrastructure
1405 for (multi-)cluster based systems, such as big.LITTLE based
1408 config MCPM_QUAD_CLUSTER
1412 To avoid wasting resources unnecessarily, MCPM only supports up
1413 to 2 clusters by default.
1414 Platforms with 3 or 4 clusters that use MCPM must select this
1415 option to allow the additional clusters to be managed.
1418 bool "big.LITTLE support (Experimental)"
1419 depends on CPU_V7 && SMP
1422 This option enables support selections for the big.LITTLE
1423 system architecture.
1426 bool "big.LITTLE switcher support"
1427 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1428 select ARM_CPU_SUSPEND
1431 The big.LITTLE "switcher" provides the core functionality to
1432 transparently handle transition between a cluster of A15's
1433 and a cluster of A7's in a big.LITTLE system.
1435 config BL_SWITCHER_DUMMY_IF
1436 tristate "Simple big.LITTLE switcher user interface"
1437 depends on BL_SWITCHER && DEBUG_KERNEL
1439 This is a simple and dummy char dev interface to control
1440 the big.LITTLE switcher core code. It is meant for
1441 debugging purposes only.
1444 prompt "Memory split"
1448 Select the desired split between kernel and user memory.
1450 If you are not absolutely sure what you are doing, leave this
1454 bool "3G/1G user/kernel split"
1456 bool "2G/2G user/kernel split"
1458 bool "1G/3G user/kernel split"
1463 default PHYS_OFFSET if !MMU
1464 default 0x40000000 if VMSPLIT_1G
1465 default 0x80000000 if VMSPLIT_2G
1469 int "Maximum number of CPUs (2-32)"
1475 bool "Support for hot-pluggable CPUs"
1478 Say Y here to experiment with turning CPUs off and on. CPUs
1479 can be controlled through /sys/devices/system/cpu.
1482 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1485 Say Y here if you want Linux to communicate with system firmware
1486 implementing the PSCI specification for CPU-centric power
1487 management operations described in ARM document number ARM DEN
1488 0022A ("Power State Coordination Interface System Software on
1491 # The GPIO number here must be sorted by descending number. In case of
1492 # a multiplatform kernel, we just want the highest value required by the
1493 # selected platforms.
1496 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1497 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1498 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1499 default 416 if ARCH_SUNXI
1500 default 392 if ARCH_U8500
1501 default 352 if ARCH_VT8500
1502 default 288 if ARCH_ROCKCHIP
1503 default 264 if MACH_H4700
1506 Maximum number of GPIOs in the system.
1508 If unsure, leave the default value.
1510 source kernel/Kconfig.preempt
1514 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1515 ARCH_S5PV210 || ARCH_EXYNOS4
1516 default AT91_TIMER_HZ if ARCH_AT91
1517 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1521 depends on HZ_FIXED = 0
1522 prompt "Timer frequency"
1546 default HZ_FIXED if HZ_FIXED != 0
1547 default 100 if HZ_100
1548 default 200 if HZ_200
1549 default 250 if HZ_250
1550 default 300 if HZ_300
1551 default 500 if HZ_500
1555 def_bool HIGH_RES_TIMERS
1557 config THUMB2_KERNEL
1558 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1559 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1560 default y if CPU_THUMBONLY
1562 select ARM_ASM_UNIFIED
1565 By enabling this option, the kernel will be compiled in
1566 Thumb-2 mode. A compiler/assembler that understand the unified
1567 ARM-Thumb syntax is needed.
1571 config THUMB2_AVOID_R_ARM_THM_JUMP11
1572 bool "Work around buggy Thumb-2 short branch relocations in gas"
1573 depends on THUMB2_KERNEL && MODULES
1576 Various binutils versions can resolve Thumb-2 branches to
1577 locally-defined, preemptible global symbols as short-range "b.n"
1578 branch instructions.
1580 This is a problem, because there's no guarantee the final
1581 destination of the symbol, or any candidate locations for a
1582 trampoline, are within range of the branch. For this reason, the
1583 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1584 relocation in modules at all, and it makes little sense to add
1587 The symptom is that the kernel fails with an "unsupported
1588 relocation" error when loading some modules.
1590 Until fixed tools are available, passing
1591 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1592 code which hits this problem, at the cost of a bit of extra runtime
1593 stack usage in some cases.
1595 The problem is described in more detail at:
1596 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1598 Only Thumb-2 kernels are affected.
1600 Unless you are sure your tools don't have this problem, say Y.
1602 config ARM_ASM_UNIFIED
1606 bool "Use the ARM EABI to compile the kernel"
1608 This option allows for the kernel to be compiled using the latest
1609 ARM ABI (aka EABI). This is only useful if you are using a user
1610 space environment that is also compiled with EABI.
1612 Since there are major incompatibilities between the legacy ABI and
1613 EABI, especially with regard to structure member alignment, this
1614 option also changes the kernel syscall calling convention to
1615 disambiguate both ABIs and allow for backward compatibility support
1616 (selected with CONFIG_OABI_COMPAT).
1618 To use this you need GCC version 4.0.0 or later.
1621 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1622 depends on AEABI && !THUMB2_KERNEL
1624 This option preserves the old syscall interface along with the
1625 new (ARM EABI) one. It also provides a compatibility layer to
1626 intercept syscalls that have structure arguments which layout
1627 in memory differs between the legacy ABI and the new ARM EABI
1628 (only for non "thumb" binaries). This option adds a tiny
1629 overhead to all syscalls and produces a slightly larger kernel.
1631 The seccomp filter system will not be available when this is
1632 selected, since there is no way yet to sensibly distinguish
1633 between calling conventions during filtering.
1635 If you know you'll be using only pure EABI user space then you
1636 can say N here. If this option is not selected and you attempt
1637 to execute a legacy ABI binary then the result will be
1638 UNPREDICTABLE (in fact it can be predicted that it won't work
1639 at all). If in doubt say N.
1641 config ARCH_HAS_HOLES_MEMORYMODEL
1644 config ARCH_SPARSEMEM_ENABLE
1647 config ARCH_SPARSEMEM_DEFAULT
1648 def_bool ARCH_SPARSEMEM_ENABLE
1650 config ARCH_SELECT_MEMORY_MODEL
1651 def_bool ARCH_SPARSEMEM_ENABLE
1653 config HAVE_ARCH_PFN_VALID
1654 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1656 config HAVE_GENERIC_RCU_GUP
1661 bool "High Memory Support"
1664 The address space of ARM processors is only 4 Gigabytes large
1665 and it has to accommodate user address space, kernel address
1666 space as well as some memory mapped IO. That means that, if you
1667 have a large amount of physical memory and/or IO, not all of the
1668 memory can be "permanently mapped" by the kernel. The physical
1669 memory that is not permanently mapped is called "high memory".
1671 Depending on the selected kernel/user memory split, minimum
1672 vmalloc space and actual amount of RAM, you may not need this
1673 option which should result in a slightly faster kernel.
1678 bool "Allocate 2nd-level pagetables from highmem"
1681 config HW_PERF_EVENTS
1682 bool "Enable hardware performance counter support for perf events"
1683 depends on PERF_EVENTS
1686 Enable hardware performance counter support for perf events. If
1687 disabled, perf events will use software events only.
1689 config SYS_SUPPORTS_HUGETLBFS
1693 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1697 config ARCH_WANT_GENERAL_HUGETLB
1702 config FORCE_MAX_ZONEORDER
1703 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1704 range 11 64 if ARCH_SHMOBILE_LEGACY
1705 default "12" if SOC_AM33XX
1706 default "9" if SA1111 || ARCH_EFM32
1709 The kernel memory allocator divides physically contiguous memory
1710 blocks into "zones", where each zone is a power of two number of
1711 pages. This option selects the largest power of two that the kernel
1712 keeps in the memory allocator. If you need to allocate very large
1713 blocks of physically contiguous memory, then you may need to
1714 increase this value.
1716 This config option is actually maximum order plus one. For example,
1717 a value of 11 means that the largest free memory block is 2^10 pages.
1719 config ALIGNMENT_TRAP
1721 depends on CPU_CP15_MMU
1722 default y if !ARCH_EBSA110
1723 select HAVE_PROC_CPU if PROC_FS
1725 ARM processors cannot fetch/store information which is not
1726 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1727 address divisible by 4. On 32-bit ARM processors, these non-aligned
1728 fetch/store instructions will be emulated in software if you say
1729 here, which has a severe performance impact. This is necessary for
1730 correct operation of some network protocols. With an IP-only
1731 configuration it is safe to say N, otherwise say Y.
1733 config UACCESS_WITH_MEMCPY
1734 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1736 default y if CPU_FEROCEON
1738 Implement faster copy_to_user and clear_user methods for CPU
1739 cores where a 8-word STM instruction give significantly higher
1740 memory write throughput than a sequence of individual 32bit stores.
1742 A possible side effect is a slight increase in scheduling latency
1743 between threads sharing the same address space if they invoke
1744 such copy operations with large buffers.
1746 However, if the CPU data cache is using a write-allocate mode,
1747 this option is unlikely to provide any performance gain.
1751 prompt "Enable seccomp to safely compute untrusted bytecode"
1753 This kernel feature is useful for number crunching applications
1754 that may need to compute untrusted bytecode during their
1755 execution. By using pipes or other transports made available to
1756 the process as file descriptors supporting the read/write
1757 syscalls, it's possible to isolate those applications in
1758 their own address space using seccomp. Once seccomp is
1759 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1760 and the task is only allowed to execute a few safe syscalls
1761 defined by each seccomp mode.
1774 bool "Xen guest support on ARM"
1775 depends on ARM && AEABI && OF
1776 depends on CPU_V7 && !CPU_V6
1777 depends on !GENERIC_ATOMIC64
1779 select ARCH_DMA_ADDR_T_64BIT
1783 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1790 bool "Flattened Device Tree support"
1793 select OF_EARLY_FLATTREE
1794 select OF_RESERVED_MEM
1796 Include support for flattened device tree machine descriptions.
1799 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1802 This is the traditional way of passing data to the kernel at boot
1803 time. If you are solely relying on the flattened device tree (or
1804 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1805 to remove ATAGS support from your kernel binary. If unsure,
1808 config DEPRECATED_PARAM_STRUCT
1809 bool "Provide old way to pass kernel parameters"
1812 This was deprecated in 2001 and announced to live on for 5 years.
1813 Some old boot loaders still use this way.
1815 # Compressed boot loader in ROM. Yes, we really want to ask about
1816 # TEXT and BSS so we preserve their values in the config files.
1817 config ZBOOT_ROM_TEXT
1818 hex "Compressed ROM boot loader base address"
1821 The physical address at which the ROM-able zImage is to be
1822 placed in the target. Platforms which normally make use of
1823 ROM-able zImage formats normally set this to a suitable
1824 value in their defconfig file.
1826 If ZBOOT_ROM is not enabled, this has no effect.
1828 config ZBOOT_ROM_BSS
1829 hex "Compressed ROM boot loader BSS address"
1832 The base address of an area of read/write memory in the target
1833 for the ROM-able zImage which must be available while the
1834 decompressor is running. It must be large enough to hold the
1835 entire decompressed kernel plus an additional 128 KiB.
1836 Platforms which normally make use of ROM-able zImage formats
1837 normally set this to a suitable value in their defconfig file.
1839 If ZBOOT_ROM is not enabled, this has no effect.
1842 bool "Compressed boot loader in ROM/flash"
1843 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1844 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1846 Say Y here if you intend to execute your compressed kernel image
1847 (zImage) directly from ROM or flash. If unsure, say N.
1850 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1851 depends on ZBOOT_ROM && ARCH_SH7372
1852 default ZBOOT_ROM_NONE
1854 Include experimental SD/MMC loading code in the ROM-able zImage.
1855 With this enabled it is possible to write the ROM-able zImage
1856 kernel image to an MMC or SD card and boot the kernel straight
1857 from the reset vector. At reset the processor Mask ROM will load
1858 the first part of the ROM-able zImage which in turn loads the
1859 rest the kernel image to RAM.
1861 config ZBOOT_ROM_NONE
1862 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1864 Do not load image from SD or MMC
1866 config ZBOOT_ROM_MMCIF
1867 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1869 Load image from MMCIF hardware block.
1871 config ZBOOT_ROM_SH_MOBILE_SDHI
1872 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1874 Load image from SDHI hardware block
1878 config ARM_APPENDED_DTB
1879 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1882 With this option, the boot code will look for a device tree binary
1883 (DTB) appended to zImage
1884 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1886 This is meant as a backward compatibility convenience for those
1887 systems with a bootloader that can't be upgraded to accommodate
1888 the documented boot protocol using a device tree.
1890 Beware that there is very little in terms of protection against
1891 this option being confused by leftover garbage in memory that might
1892 look like a DTB header after a reboot if no actual DTB is appended
1893 to zImage. Do not leave this option active in a production kernel
1894 if you don't intend to always append a DTB. Proper passing of the
1895 location into r2 of a bootloader provided DTB is always preferable
1898 config ARM_ATAG_DTB_COMPAT
1899 bool "Supplement the appended DTB with traditional ATAG information"
1900 depends on ARM_APPENDED_DTB
1902 Some old bootloaders can't be updated to a DTB capable one, yet
1903 they provide ATAGs with memory configuration, the ramdisk address,
1904 the kernel cmdline string, etc. Such information is dynamically
1905 provided by the bootloader and can't always be stored in a static
1906 DTB. To allow a device tree enabled kernel to be used with such
1907 bootloaders, this option allows zImage to extract the information
1908 from the ATAG list and store it at run time into the appended DTB.
1911 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1912 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1914 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1915 bool "Use bootloader kernel arguments if available"
1917 Uses the command-line options passed by the boot loader instead of
1918 the device tree bootargs property. If the boot loader doesn't provide
1919 any, the device tree bootargs property will be used.
1921 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1922 bool "Extend with bootloader kernel arguments"
1924 The command-line arguments provided by the boot loader will be
1925 appended to the the device tree bootargs property.
1930 string "Default kernel command string"
1933 On some architectures (EBSA110 and CATS), there is currently no way
1934 for the boot loader to pass arguments to the kernel. For these
1935 architectures, you should supply some command-line options at build
1936 time by entering them here. As a minimum, you should specify the
1937 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1940 prompt "Kernel command line type" if CMDLINE != ""
1941 default CMDLINE_FROM_BOOTLOADER
1944 config CMDLINE_FROM_BOOTLOADER
1945 bool "Use bootloader kernel arguments if available"
1947 Uses the command-line options passed by the boot loader. If
1948 the boot loader doesn't provide any, the default kernel command
1949 string provided in CMDLINE will be used.
1951 config CMDLINE_EXTEND
1952 bool "Extend bootloader kernel arguments"
1954 The command-line arguments provided by the boot loader will be
1955 appended to the default kernel command string.
1957 config CMDLINE_FORCE
1958 bool "Always use the default kernel command string"
1960 Always use the default kernel command string, even if the boot
1961 loader passes other arguments to the kernel.
1962 This is useful if you cannot or don't want to change the
1963 command-line options your boot loader passes to the kernel.
1967 bool "Kernel Execute-In-Place from ROM"
1968 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1970 Execute-In-Place allows the kernel to run from non-volatile storage
1971 directly addressable by the CPU, such as NOR flash. This saves RAM
1972 space since the text section of the kernel is not loaded from flash
1973 to RAM. Read-write sections, such as the data section and stack,
1974 are still copied to RAM. The XIP kernel is not compressed since
1975 it has to run directly from flash, so it will take more space to
1976 store it. The flash address used to link the kernel object files,
1977 and for storing it, is configuration dependent. Therefore, if you
1978 say Y here, you must know the proper physical address where to
1979 store the kernel image depending on your own flash memory usage.
1981 Also note that the make target becomes "make xipImage" rather than
1982 "make zImage" or "make Image". The final kernel binary to put in
1983 ROM memory will be arch/arm/boot/xipImage.
1987 config XIP_PHYS_ADDR
1988 hex "XIP Kernel Physical Location"
1989 depends on XIP_KERNEL
1990 default "0x00080000"
1992 This is the physical address in your flash memory the kernel will
1993 be linked for and stored to. This address is dependent on your
1997 bool "Kexec system call (EXPERIMENTAL)"
1998 depends on (!SMP || PM_SLEEP_SMP)
2000 kexec is a system call that implements the ability to shutdown your
2001 current kernel, and to start another kernel. It is like a reboot
2002 but it is independent of the system firmware. And like a reboot
2003 you can start any kernel with it, not just Linux.
2005 It is an ongoing process to be certain the hardware in a machine
2006 is properly shutdown, so do not be surprised if this code does not
2007 initially work for you.
2010 bool "Export atags in procfs"
2011 depends on ATAGS && KEXEC
2014 Should the atags used to boot the kernel be exported in an "atags"
2015 file in procfs. Useful with kexec.
2018 bool "Build kdump crash kernel (EXPERIMENTAL)"
2020 Generate crash dump after being started by kexec. This should
2021 be normally only set in special crash dump kernels which are
2022 loaded in the main kernel with kexec-tools into a specially
2023 reserved region and then later executed after a crash by
2024 kdump/kexec. The crash dump kernel must be compiled to a
2025 memory address not used by the main kernel
2027 For more details see Documentation/kdump/kdump.txt
2029 config AUTO_ZRELADDR
2030 bool "Auto calculation of the decompressed kernel image address"
2032 ZRELADDR is the physical address where the decompressed kernel
2033 image will be placed. If AUTO_ZRELADDR is selected, the address
2034 will be determined at run-time by masking the current IP with
2035 0xf8000000. This assumes the zImage being placed in the first 128MB
2036 from start of memory.
2040 menu "CPU Power Management"
2042 source "drivers/cpufreq/Kconfig"
2044 source "drivers/cpuidle/Kconfig"
2048 menu "Floating point emulation"
2050 comment "At least one emulation must be selected"
2053 bool "NWFPE math emulation"
2054 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2056 Say Y to include the NWFPE floating point emulator in the kernel.
2057 This is necessary to run most binaries. Linux does not currently
2058 support floating point hardware so you need to say Y here even if
2059 your machine has an FPA or floating point co-processor podule.
2061 You may say N here if you are going to load the Acorn FPEmulator
2062 early in the bootup.
2065 bool "Support extended precision"
2066 depends on FPE_NWFPE
2068 Say Y to include 80-bit support in the kernel floating-point
2069 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2070 Note that gcc does not generate 80-bit operations by default,
2071 so in most cases this option only enlarges the size of the
2072 floating point emulator without any good reason.
2074 You almost surely want to say N here.
2077 bool "FastFPE math emulation (EXPERIMENTAL)"
2078 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2080 Say Y here to include the FAST floating point emulator in the kernel.
2081 This is an experimental much faster emulator which now also has full
2082 precision for the mantissa. It does not support any exceptions.
2083 It is very simple, and approximately 3-6 times faster than NWFPE.
2085 It should be sufficient for most programs. It may be not suitable
2086 for scientific calculations, but you have to check this for yourself.
2087 If you do not feel you need a faster FP emulation you should better
2091 bool "VFP-format floating point maths"
2092 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2094 Say Y to include VFP support code in the kernel. This is needed
2095 if your hardware includes a VFP unit.
2097 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2098 release notes and additional status information.
2100 Say N if your target does not have VFP hardware.
2108 bool "Advanced SIMD (NEON) Extension support"
2109 depends on VFPv3 && CPU_V7
2111 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2114 config KERNEL_MODE_NEON
2115 bool "Support for NEON in kernel mode"
2116 depends on NEON && AEABI
2118 Say Y to include support for NEON in kernel mode.
2122 menu "Userspace binary formats"
2124 source "fs/Kconfig.binfmt"
2127 tristate "RISC OS personality"
2130 Say Y here to include the kernel code necessary if you want to run
2131 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2132 experimental; if this sounds frightening, say N and sleep in peace.
2133 You can also say M here to compile this support as a module (which
2134 will be called arthur).
2138 menu "Power management options"
2140 source "kernel/power/Kconfig"
2142 config ARCH_SUSPEND_POSSIBLE
2143 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2144 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2147 config ARM_CPU_SUSPEND
2150 config ARCH_HIBERNATION_POSSIBLE
2153 default y if ARCH_SUSPEND_POSSIBLE
2157 source "net/Kconfig"
2159 source "drivers/Kconfig"
2163 source "arch/arm/Kconfig.debug"
2165 source "security/Kconfig"
2167 source "crypto/Kconfig"
2169 source "lib/Kconfig"
2171 source "arch/arm/kvm/Kconfig"