4 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
5 select ARCH_HAS_ELF_RANDOMIZE
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
19 select EDAC_ATOMIC_SCRUB
20 select GENERIC_ALLOCATOR
21 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
22 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
23 select GENERIC_IDLE_POLL_SETUP
24 select GENERIC_IRQ_PROBE
25 select GENERIC_IRQ_SHOW
26 select GENERIC_IRQ_SHOW_LEVEL
27 select GENERIC_PCI_IOMAP
28 select GENERIC_SCHED_CLOCK
29 select GENERIC_SMP_IDLE_THREAD
30 select GENERIC_STRNCPY_FROM_USER
31 select GENERIC_STRNLEN_USER
32 select HANDLE_DOMAIN_IRQ
33 select HARDIRQS_SW_RESEND
34 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
35 select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
36 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32
37 select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32
38 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
39 select HAVE_ARCH_TRACEHOOK
41 select HAVE_CC_STACKPROTECTOR
42 select HAVE_CONTEXT_TRACKING
43 select HAVE_C_RECORDMCOUNT
44 select HAVE_DEBUG_KMEMLEAK
45 select HAVE_DMA_API_DEBUG
47 select HAVE_DMA_CONTIGUOUS if MMU
48 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32
49 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
50 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
51 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
52 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
53 select HAVE_GENERIC_DMA_COHERENT
54 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
55 select HAVE_IDE if PCI || ISA || PCMCIA
56 select HAVE_IRQ_TIME_ACCOUNTING
57 select HAVE_KERNEL_GZIP
58 select HAVE_KERNEL_LZ4
59 select HAVE_KERNEL_LZMA
60 select HAVE_KERNEL_LZO
62 select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
63 select HAVE_KRETPROBES if (HAVE_KPROBES)
65 select HAVE_MOD_ARCH_SPECIFIC
66 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
67 select HAVE_OPTPROBES if !THUMB2_KERNEL
68 select HAVE_PERF_EVENTS
70 select HAVE_PERF_USER_STACK_DUMP
71 select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
72 select HAVE_REGS_AND_STACK_ACCESS_API
73 select HAVE_SYSCALL_TRACEPOINTS
75 select HAVE_VIRT_CPU_ACCOUNTING_GEN
76 select IRQ_FORCED_THREADING
77 select MODULES_USE_ELF_REL
80 select OLD_SIGSUSPEND3
81 select PERF_USE_VMALLOC
83 select SYS_SUPPORTS_APM_EMULATION
84 # Above selects are sorted alphabetically; please add new ones
85 # according to that. Thanks.
87 The ARM series is a line of low-power-consumption RISC chip designs
88 licensed by ARM Ltd and targeted at embedded applications and
89 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
90 manufactured, but legacy ARM-based PC hardware remains popular in
91 Europe. There is an ARM Linux project with a web page at
92 <http://www.arm.linux.org.uk/>.
94 config ARM_HAS_SG_CHAIN
95 select ARCH_HAS_SG_CHAIN
98 config NEED_SG_DMA_LENGTH
101 config ARM_DMA_USE_IOMMU
103 select ARM_HAS_SG_CHAIN
104 select NEED_SG_DMA_LENGTH
108 config ARM_DMA_IOMMU_ALIGNMENT
109 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
113 DMA mapping framework by default aligns all buffers to the smallest
114 PAGE_SIZE order which is greater than or equal to the requested buffer
115 size. This works well for buffers up to a few hundreds kilobytes, but
116 for larger buffers it just a waste of address space. Drivers which has
117 relatively small addressing window (like 64Mib) might run out of
118 virtual space with just a few allocations.
120 With this parameter you can specify the maximum PAGE_SIZE order for
121 DMA IOMMU buffers. Larger buffers will be aligned only to this
122 specified order. The order is expressed as a power of two multiplied
127 config MIGHT_HAVE_PCI
130 config SYS_SUPPORTS_APM_EMULATION
135 select GENERIC_ALLOCATOR
146 The Extended Industry Standard Architecture (EISA) bus was
147 developed as an open alternative to the IBM MicroChannel bus.
149 The EISA bus provided some of the features of the IBM MicroChannel
150 bus while maintaining backward compatibility with cards made for
151 the older ISA bus. The EISA bus saw limited use between 1988 and
152 1995 when it was made obsolete by the PCI bus.
154 Say Y here if you are building a kernel for an EISA-based machine.
161 config STACKTRACE_SUPPORT
165 config HAVE_LATENCYTOP_SUPPORT
170 config LOCKDEP_SUPPORT
174 config TRACE_IRQFLAGS_SUPPORT
178 config RWSEM_XCHGADD_ALGORITHM
182 config ARCH_HAS_ILOG2_U32
185 config ARCH_HAS_ILOG2_U64
188 config ARCH_HAS_BANDGAP
191 config FIX_EARLYCON_MEM
194 config GENERIC_HWEIGHT
198 config GENERIC_CALIBRATE_DELAY
202 config ARCH_MAY_HAVE_PC_FDC
208 config NEED_DMA_MAP_STATE
211 config ARCH_SUPPORTS_UPROBES
214 config ARCH_HAS_DMA_SET_COHERENT_MASK
217 config GENERIC_ISA_DMA
223 config NEED_RET_TO_USER
231 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
232 default DRAM_BASE if REMAP_VECTORS_TO_RAM
235 The base address of exception vectors. This must be two pages
238 config ARM_PATCH_PHYS_VIRT
239 bool "Patch physical to virtual translations at runtime" if EMBEDDED
241 depends on !XIP_KERNEL && MMU
242 depends on !ARCH_REALVIEW || !SPARSEMEM
244 Patch phys-to-virt and virt-to-phys translation functions at
245 boot and module load time according to the position of the
246 kernel in system memory.
248 This can only be used with non-XIP MMU kernels where the base
249 of physical memory is at a 16MB boundary.
251 Only disable this option if you know that you do not require
252 this feature (eg, building a kernel for a single machine) and
253 you need to shrink the kernel to the minimal size.
255 config NEED_MACH_IO_H
258 Select this when mach/io.h is required to provide special
259 definitions for this platform. The need for mach/io.h should
260 be avoided when possible.
262 config NEED_MACH_MEMORY_H
265 Select this when mach/memory.h is required to provide special
266 definitions for this platform. The need for mach/memory.h should
267 be avoided when possible.
270 hex "Physical address of main memory" if MMU
271 depends on !ARM_PATCH_PHYS_VIRT
272 default DRAM_BASE if !MMU
273 default 0x00000000 if ARCH_EBSA110 || \
278 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
279 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
280 default 0x20000000 if ARCH_S5PV210
281 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
282 default 0xc0000000 if ARCH_SA1100
284 Please provide the physical address corresponding to the
285 location of main memory in your system.
291 config PGTABLE_LEVELS
293 default 3 if ARM_LPAE
296 source "init/Kconfig"
298 source "kernel/Kconfig.freezer"
303 bool "MMU-based Paged Memory Management Support"
306 Select if you want MMU-based virtualised addressing space
307 support by paged memory management. If unsure, say 'Y'.
310 # The "ARM system type" choice list is ordered alphabetically by option
311 # text. Please add new entries in the option alphabetic order.
314 prompt "ARM system type"
315 default ARCH_VERSATILE if !MMU
316 default ARCH_MULTIPLATFORM if MMU
318 config ARCH_MULTIPLATFORM
319 bool "Allow multiple platforms to be selected"
321 select ARCH_WANT_OPTIONAL_GPIOLIB
322 select ARM_HAS_SG_CHAIN
323 select ARM_PATCH_PHYS_VIRT
327 select GENERIC_CLOCKEVENTS
328 select MIGHT_HAVE_PCI
329 select MULTI_IRQ_HANDLER
333 config ARM_SINGLE_ARMV7M
334 bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
336 select ARCH_WANT_OPTIONAL_GPIOLIB
342 select GENERIC_CLOCKEVENTS
348 bool "ARM Ltd. RealView family"
349 select ARCH_WANT_OPTIONAL_GPIOLIB
351 select ARM_TIMER_SP804
353 select COMMON_CLK_VERSATILE
354 select GENERIC_CLOCKEVENTS
355 select GPIO_PL061 if GPIOLIB
357 select NEED_MACH_MEMORY_H
358 select PLAT_VERSATILE
359 select PLAT_VERSATILE_SCHED_CLOCK
361 This enables support for ARM Ltd RealView boards.
363 config ARCH_VERSATILE
364 bool "ARM Ltd. Versatile family"
365 select ARCH_WANT_OPTIONAL_GPIOLIB
367 select ARM_TIMER_SP804
370 select GENERIC_CLOCKEVENTS
371 select HAVE_MACH_CLKDEV
373 select PLAT_VERSATILE
374 select PLAT_VERSATILE_CLOCK
375 select PLAT_VERSATILE_SCHED_CLOCK
376 select VERSATILE_FPGA_IRQ
378 This enables support for ARM Ltd Versatile board.
381 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
382 select ARCH_REQUIRE_GPIOLIB
387 select GENERIC_CLOCKEVENTS
391 Support for Cirrus Logic 711x/721x/731x based boards.
394 bool "Cortina Systems Gemini"
395 select ARCH_REQUIRE_GPIOLIB
398 select GENERIC_CLOCKEVENTS
400 Support for the Cortina Systems Gemini family SoCs
404 select ARCH_USES_GETTIMEOFFSET
407 select NEED_MACH_IO_H
408 select NEED_MACH_MEMORY_H
411 This is an evaluation board for the StrongARM processor available
412 from Digital. It has limited hardware on-board, including an
413 Ethernet interface, two PCMCIA sockets, two serial ports and a
418 select ARCH_HAS_HOLES_MEMORYMODEL
419 select ARCH_REQUIRE_GPIOLIB
421 select ARM_PATCH_PHYS_VIRT
427 select GENERIC_CLOCKEVENTS
429 This enables support for the Cirrus EP93xx series of CPUs.
431 config ARCH_FOOTBRIDGE
435 select GENERIC_CLOCKEVENTS
437 select NEED_MACH_IO_H if !MMU
438 select NEED_MACH_MEMORY_H
440 Support for systems based on the DC21285 companion chip
441 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
444 bool "Hilscher NetX based"
448 select GENERIC_CLOCKEVENTS
450 This enables support for systems based on the Hilscher NetX Soc
456 select NEED_MACH_MEMORY_H
457 select NEED_RET_TO_USER
463 Support for Intel's IOP13XX (XScale) family of processors.
468 select ARCH_REQUIRE_GPIOLIB
471 select NEED_RET_TO_USER
475 Support for Intel's 80219 and IOP32X (XScale) family of
481 select ARCH_REQUIRE_GPIOLIB
484 select NEED_RET_TO_USER
488 Support for Intel's IOP33X (XScale) family of processors.
493 select ARCH_HAS_DMA_SET_COHERENT_MASK
494 select ARCH_REQUIRE_GPIOLIB
495 select ARCH_SUPPORTS_BIG_ENDIAN
498 select DMABOUNCE if PCI
499 select GENERIC_CLOCKEVENTS
500 select MIGHT_HAVE_PCI
501 select NEED_MACH_IO_H
502 select USB_EHCI_BIG_ENDIAN_DESC
503 select USB_EHCI_BIG_ENDIAN_MMIO
505 Support for Intel's IXP4XX (XScale) family of processors.
509 select ARCH_REQUIRE_GPIOLIB
511 select GENERIC_CLOCKEVENTS
512 select MIGHT_HAVE_PCI
516 select PLAT_ORION_LEGACY
518 Support for the Marvell Dove SoC 88AP510
521 bool "Marvell MV78xx0"
522 select ARCH_REQUIRE_GPIOLIB
524 select GENERIC_CLOCKEVENTS
527 select PLAT_ORION_LEGACY
529 Support for the following Marvell MV78xx0 series SoCs:
535 select ARCH_REQUIRE_GPIOLIB
537 select GENERIC_CLOCKEVENTS
540 select PLAT_ORION_LEGACY
541 select MULTI_IRQ_HANDLER
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 MULTI_IRQ_HANDLER
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
601 Support for the NXP LPC32XX family of processors
604 bool "PXA2xx/PXA3xx-based"
607 select ARCH_REQUIRE_GPIOLIB
608 select ARM_CPU_SUSPEND if PM
614 select GENERIC_CLOCKEVENTS
618 select MULTI_IRQ_HANDLER
622 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
624 config ARCH_SHMOBILE_LEGACY
625 bool "Renesas ARM SoCs (non-multiplatform)"
627 select ARM_PATCH_PHYS_VIRT if MMU
630 select GENERIC_CLOCKEVENTS
631 select HAVE_ARM_SCU if SMP
632 select HAVE_ARM_TWD if SMP
634 select MIGHT_HAVE_CACHE_L2X0
635 select MULTI_IRQ_HANDLER
638 select PM_GENERIC_DOMAINS if PM
642 Support for Renesas ARM SoC platforms using a non-multiplatform
643 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
650 select ARCH_MAY_HAVE_PC_FDC
651 select ARCH_SPARSEMEM_ENABLE
652 select ARCH_USES_GETTIMEOFFSET
656 select HAVE_PATA_PLATFORM
658 select NEED_MACH_IO_H
659 select NEED_MACH_MEMORY_H
663 On the Acorn Risc-PC, Linux can support the internal IDE disk and
664 CD-ROM interface, serial and parallel port, and the floppy drive.
669 select ARCH_REQUIRE_GPIOLIB
670 select ARCH_SPARSEMEM_ENABLE
675 select GENERIC_CLOCKEVENTS
679 select MULTI_IRQ_HANDLER
680 select NEED_MACH_MEMORY_H
683 Support for StrongARM 11x0 based boards.
686 bool "Samsung S3C24XX SoCs"
687 select ARCH_REQUIRE_GPIOLIB
690 select CLKSRC_SAMSUNG_PWM
691 select GENERIC_CLOCKEVENTS
693 select HAVE_S3C2410_I2C if I2C
694 select HAVE_S3C2410_WATCHDOG if WATCHDOG
695 select HAVE_S3C_RTC if RTC_CLASS
696 select MULTI_IRQ_HANDLER
697 select NEED_MACH_IO_H
700 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
701 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
702 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
703 Samsung SMDK2410 development board (and derivatives).
706 bool "Samsung S3C64XX"
707 select ARCH_REQUIRE_GPIOLIB
712 select CLKSRC_SAMSUNG_PWM
713 select COMMON_CLK_SAMSUNG
715 select GENERIC_CLOCKEVENTS
717 select HAVE_S3C2410_I2C if I2C
718 select HAVE_S3C2410_WATCHDOG if WATCHDOG
722 select PM_GENERIC_DOMAINS if PM
724 select S3C_GPIO_TRACK
726 select SAMSUNG_WAKEMASK
727 select SAMSUNG_WDT_RESET
729 Samsung S3C64XX series based systems
733 select ARCH_HAS_HOLES_MEMORYMODEL
734 select ARCH_REQUIRE_GPIOLIB
736 select GENERIC_ALLOCATOR
737 select GENERIC_CLOCKEVENTS
738 select GENERIC_IRQ_CHIP
744 Support for TI's DaVinci platform.
749 select ARCH_HAS_HOLES_MEMORYMODEL
751 select ARCH_REQUIRE_GPIOLIB
754 select GENERIC_CLOCKEVENTS
755 select GENERIC_IRQ_CHIP
758 select MULTI_IRQ_HANDLER
759 select NEED_MACH_IO_H if PCCARD
760 select NEED_MACH_MEMORY_H
763 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
767 menu "Multiple platform selection"
768 depends on ARCH_MULTIPLATFORM
770 comment "CPU Core family selection"
773 bool "ARMv4 based platforms (FA526)"
774 depends on !ARCH_MULTI_V6_V7
775 select ARCH_MULTI_V4_V5
778 config ARCH_MULTI_V4T
779 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
780 depends on !ARCH_MULTI_V6_V7
781 select ARCH_MULTI_V4_V5
782 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
783 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
784 CPU_ARM925T || CPU_ARM940T)
787 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
788 depends on !ARCH_MULTI_V6_V7
789 select ARCH_MULTI_V4_V5
790 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
791 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
792 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
794 config ARCH_MULTI_V4_V5
798 bool "ARMv6 based platforms (ARM11)"
799 select ARCH_MULTI_V6_V7
803 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
805 select ARCH_MULTI_V6_V7
809 config ARCH_MULTI_V6_V7
811 select MIGHT_HAVE_CACHE_L2X0
813 config ARCH_MULTI_CPU_AUTO
814 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
820 bool "Dummy Virtual Machine" if ARCH_MULTI_V7
824 select HAVE_ARM_ARCH_TIMER
827 # This is sorted alphabetically by mach-* pathname. However, plat-*
828 # Kconfigs may be included either alphabetically (according to the
829 # plat- suffix) or along side the corresponding mach-* source.
831 source "arch/arm/mach-mvebu/Kconfig"
833 source "arch/arm/mach-alpine/Kconfig"
835 source "arch/arm/mach-asm9260/Kconfig"
837 source "arch/arm/mach-at91/Kconfig"
839 source "arch/arm/mach-axxia/Kconfig"
841 source "arch/arm/mach-bcm/Kconfig"
843 source "arch/arm/mach-berlin/Kconfig"
845 source "arch/arm/mach-clps711x/Kconfig"
847 source "arch/arm/mach-cns3xxx/Kconfig"
849 source "arch/arm/mach-davinci/Kconfig"
851 source "arch/arm/mach-digicolor/Kconfig"
853 source "arch/arm/mach-dove/Kconfig"
855 source "arch/arm/mach-ep93xx/Kconfig"
857 source "arch/arm/mach-footbridge/Kconfig"
859 source "arch/arm/mach-gemini/Kconfig"
861 source "arch/arm/mach-highbank/Kconfig"
863 source "arch/arm/mach-hisi/Kconfig"
865 source "arch/arm/mach-integrator/Kconfig"
867 source "arch/arm/mach-iop32x/Kconfig"
869 source "arch/arm/mach-iop33x/Kconfig"
871 source "arch/arm/mach-iop13xx/Kconfig"
873 source "arch/arm/mach-ixp4xx/Kconfig"
875 source "arch/arm/mach-keystone/Kconfig"
877 source "arch/arm/mach-ks8695/Kconfig"
879 source "arch/arm/mach-meson/Kconfig"
881 source "arch/arm/mach-moxart/Kconfig"
883 source "arch/arm/mach-mv78xx0/Kconfig"
885 source "arch/arm/mach-imx/Kconfig"
887 source "arch/arm/mach-mediatek/Kconfig"
889 source "arch/arm/mach-mxs/Kconfig"
891 source "arch/arm/mach-netx/Kconfig"
893 source "arch/arm/mach-nomadik/Kconfig"
895 source "arch/arm/mach-nspire/Kconfig"
897 source "arch/arm/plat-omap/Kconfig"
899 source "arch/arm/mach-omap1/Kconfig"
901 source "arch/arm/mach-omap2/Kconfig"
903 source "arch/arm/mach-orion5x/Kconfig"
905 source "arch/arm/mach-picoxcell/Kconfig"
907 source "arch/arm/mach-pxa/Kconfig"
908 source "arch/arm/plat-pxa/Kconfig"
910 source "arch/arm/mach-mmp/Kconfig"
912 source "arch/arm/mach-qcom/Kconfig"
914 source "arch/arm/mach-realview/Kconfig"
916 source "arch/arm/mach-rockchip/Kconfig"
918 source "arch/arm/mach-sa1100/Kconfig"
920 source "arch/arm/mach-socfpga/Kconfig"
922 source "arch/arm/mach-spear/Kconfig"
924 source "arch/arm/mach-sti/Kconfig"
926 source "arch/arm/mach-s3c24xx/Kconfig"
928 source "arch/arm/mach-s3c64xx/Kconfig"
930 source "arch/arm/mach-s5pv210/Kconfig"
932 source "arch/arm/mach-exynos/Kconfig"
933 source "arch/arm/plat-samsung/Kconfig"
935 source "arch/arm/mach-shmobile/Kconfig"
937 source "arch/arm/mach-sunxi/Kconfig"
939 source "arch/arm/mach-prima2/Kconfig"
941 source "arch/arm/mach-tegra/Kconfig"
943 source "arch/arm/mach-u300/Kconfig"
945 source "arch/arm/mach-uniphier/Kconfig"
947 source "arch/arm/mach-ux500/Kconfig"
949 source "arch/arm/mach-versatile/Kconfig"
951 source "arch/arm/mach-vexpress/Kconfig"
952 source "arch/arm/plat-versatile/Kconfig"
954 source "arch/arm/mach-vt8500/Kconfig"
956 source "arch/arm/mach-w90x900/Kconfig"
958 source "arch/arm/mach-zx/Kconfig"
960 source "arch/arm/mach-zynq/Kconfig"
962 # ARMv7-M architecture
964 bool "Energy Micro efm32"
965 depends on ARM_SINGLE_ARMV7M
966 select ARCH_REQUIRE_GPIOLIB
968 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
972 bool "NXP LPC18xx/LPC43xx"
973 depends on ARM_SINGLE_ARMV7M
974 select ARCH_HAS_RESET_CONTROLLER
976 select CLKSRC_LPC32XX
979 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
980 high performance microcontrollers.
983 bool "STMicrolectronics STM32"
984 depends on ARM_SINGLE_ARMV7M
985 select ARCH_HAS_RESET_CONTROLLER
986 select ARMV7M_SYSTICK
988 select RESET_CONTROLLER
990 Support for STMicroelectronics STM32 processors.
992 # Definitions to make life easier
998 select GENERIC_CLOCKEVENTS
1004 select GENERIC_IRQ_CHIP
1007 config PLAT_ORION_LEGACY
1014 config PLAT_VERSATILE
1017 source "arch/arm/firmware/Kconfig"
1019 source arch/arm/mm/Kconfig
1022 bool "Enable iWMMXt support"
1023 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1024 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1026 Enable support for iWMMXt context switching at run time if
1027 running on a CPU that supports it.
1029 config MULTI_IRQ_HANDLER
1032 Allow each machine to specify it's own IRQ handler at run time.
1035 source "arch/arm/Kconfig-nommu"
1038 config PJ4B_ERRATA_4742
1039 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1040 depends on CPU_PJ4B && MACH_ARMADA_370
1043 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1044 Event (WFE) IDLE states, a specific timing sensitivity exists between
1045 the retiring WFI/WFE instructions and the newly issued subsequent
1046 instructions. This sensitivity can result in a CPU hang scenario.
1048 The software must insert either a Data Synchronization Barrier (DSB)
1049 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1052 config ARM_ERRATA_326103
1053 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1056 Executing a SWP instruction to read-only memory does not set bit 11
1057 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1058 treat the access as a read, preventing a COW from occurring and
1059 causing the faulting task to livelock.
1061 config ARM_ERRATA_411920
1062 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1063 depends on CPU_V6 || CPU_V6K
1065 Invalidation of the Instruction Cache operation can
1066 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1067 It does not affect the MPCore. This option enables the ARM Ltd.
1068 recommended workaround.
1070 config ARM_ERRATA_430973
1071 bool "ARM errata: Stale prediction on replaced interworking branch"
1074 This option enables the workaround for the 430973 Cortex-A8
1075 r1p* erratum. If a code sequence containing an ARM/Thumb
1076 interworking branch is replaced with another code sequence at the
1077 same virtual address, whether due to self-modifying code or virtual
1078 to physical address re-mapping, Cortex-A8 does not recover from the
1079 stale interworking branch prediction. This results in Cortex-A8
1080 executing the new code sequence in the incorrect ARM or Thumb state.
1081 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1082 and also flushes the branch target cache at every context switch.
1083 Note that setting specific bits in the ACTLR register may not be
1084 available in non-secure mode.
1086 config ARM_ERRATA_458693
1087 bool "ARM errata: Processor deadlock when a false hazard is created"
1089 depends on !ARCH_MULTIPLATFORM
1091 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1092 erratum. For very specific sequences of memory operations, it is
1093 possible for a hazard condition intended for a cache line to instead
1094 be incorrectly associated with a different cache line. This false
1095 hazard might then cause a processor deadlock. The workaround enables
1096 the L1 caching of the NEON accesses and disables the PLD instruction
1097 in the ACTLR register. Note that setting specific bits in the ACTLR
1098 register may not be available in non-secure mode.
1100 config ARM_ERRATA_460075
1101 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1103 depends on !ARCH_MULTIPLATFORM
1105 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1106 erratum. Any asynchronous access to the L2 cache may encounter a
1107 situation in which recent store transactions to the L2 cache are lost
1108 and overwritten with stale memory contents from external memory. The
1109 workaround disables the write-allocate mode for the L2 cache via the
1110 ACTLR register. Note that setting specific bits in the ACTLR register
1111 may not be available in non-secure mode.
1113 config ARM_ERRATA_742230
1114 bool "ARM errata: DMB operation may be faulty"
1115 depends on CPU_V7 && SMP
1116 depends on !ARCH_MULTIPLATFORM
1118 This option enables the workaround for the 742230 Cortex-A9
1119 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1120 between two write operations may not ensure the correct visibility
1121 ordering of the two writes. This workaround sets a specific bit in
1122 the diagnostic register of the Cortex-A9 which causes the DMB
1123 instruction to behave as a DSB, ensuring the correct behaviour of
1126 config ARM_ERRATA_742231
1127 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1128 depends on CPU_V7 && SMP
1129 depends on !ARCH_MULTIPLATFORM
1131 This option enables the workaround for the 742231 Cortex-A9
1132 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1133 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1134 accessing some data located in the same cache line, may get corrupted
1135 data due to bad handling of the address hazard when the line gets
1136 replaced from one of the CPUs at the same time as another CPU is
1137 accessing it. This workaround sets specific bits in the diagnostic
1138 register of the Cortex-A9 which reduces the linefill issuing
1139 capabilities of the processor.
1141 config ARM_ERRATA_643719
1142 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1143 depends on CPU_V7 && SMP
1146 This option enables the workaround for the 643719 Cortex-A9 (prior to
1147 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1148 register returns zero when it should return one. The workaround
1149 corrects this value, ensuring cache maintenance operations which use
1150 it behave as intended and avoiding data corruption.
1152 config ARM_ERRATA_720789
1153 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1156 This option enables the workaround for the 720789 Cortex-A9 (prior to
1157 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1158 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1159 As a consequence of this erratum, some TLB entries which should be
1160 invalidated are not, resulting in an incoherency in the system page
1161 tables. The workaround changes the TLB flushing routines to invalidate
1162 entries regardless of the ASID.
1164 config ARM_ERRATA_743622
1165 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1167 depends on !ARCH_MULTIPLATFORM
1169 This option enables the workaround for the 743622 Cortex-A9
1170 (r2p*) erratum. Under very rare conditions, a faulty
1171 optimisation in the Cortex-A9 Store Buffer may lead to data
1172 corruption. This workaround sets a specific bit in the diagnostic
1173 register of the Cortex-A9 which disables the Store Buffer
1174 optimisation, preventing the defect from occurring. This has no
1175 visible impact on the overall performance or power consumption of the
1178 config ARM_ERRATA_751472
1179 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1181 depends on !ARCH_MULTIPLATFORM
1183 This option enables the workaround for the 751472 Cortex-A9 (prior
1184 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1185 completion of a following broadcasted operation if the second
1186 operation is received by a CPU before the ICIALLUIS has completed,
1187 potentially leading to corrupted entries in the cache or TLB.
1189 config ARM_ERRATA_754322
1190 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1193 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1194 r3p*) erratum. A speculative memory access may cause a page table walk
1195 which starts prior to an ASID switch but completes afterwards. This
1196 can populate the micro-TLB with a stale entry which may be hit with
1197 the new ASID. This workaround places two dsb instructions in the mm
1198 switching code so that no page table walks can cross the ASID switch.
1200 config ARM_ERRATA_754327
1201 bool "ARM errata: no automatic Store Buffer drain"
1202 depends on CPU_V7 && SMP
1204 This option enables the workaround for the 754327 Cortex-A9 (prior to
1205 r2p0) erratum. The Store Buffer does not have any automatic draining
1206 mechanism and therefore a livelock may occur if an external agent
1207 continuously polls a memory location waiting to observe an update.
1208 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1209 written polling loops from denying visibility of updates to memory.
1211 config ARM_ERRATA_364296
1212 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1215 This options enables the workaround for the 364296 ARM1136
1216 r0p2 erratum (possible cache data corruption with
1217 hit-under-miss enabled). It sets the undocumented bit 31 in
1218 the auxiliary control register and the FI bit in the control
1219 register, thus disabling hit-under-miss without putting the
1220 processor into full low interrupt latency mode. ARM11MPCore
1223 config ARM_ERRATA_764369
1224 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1225 depends on CPU_V7 && SMP
1227 This option enables the workaround for erratum 764369
1228 affecting Cortex-A9 MPCore with two or more processors (all
1229 current revisions). Under certain timing circumstances, a data
1230 cache line maintenance operation by MVA targeting an Inner
1231 Shareable memory region may fail to proceed up to either the
1232 Point of Coherency or to the Point of Unification of the
1233 system. This workaround adds a DSB instruction before the
1234 relevant cache maintenance functions and sets a specific bit
1235 in the diagnostic control register of the SCU.
1237 config ARM_ERRATA_775420
1238 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1241 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1242 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1243 operation aborts with MMU exception, it might cause the processor
1244 to deadlock. This workaround puts DSB before executing ISB if
1245 an abort may occur on cache maintenance.
1247 config ARM_ERRATA_798181
1248 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1249 depends on CPU_V7 && SMP
1251 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1252 adequately shooting down all use of the old entries. This
1253 option enables the Linux kernel workaround for this erratum
1254 which sends an IPI to the CPUs that are running the same ASID
1255 as the one being invalidated.
1257 config ARM_ERRATA_773022
1258 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1261 This option enables the workaround for the 773022 Cortex-A15
1262 (up to r0p4) erratum. In certain rare sequences of code, the
1263 loop buffer may deliver incorrect instructions. This
1264 workaround disables the loop buffer to avoid the erratum.
1268 source "arch/arm/common/Kconfig"
1275 Find out whether you have ISA slots on your motherboard. ISA is the
1276 name of a bus system, i.e. the way the CPU talks to the other stuff
1277 inside your box. Other bus systems are PCI, EISA, MicroChannel
1278 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1279 newer boards don't support it. If you have ISA, say Y, otherwise N.
1281 # Select ISA DMA controller support
1286 # Select ISA DMA interface
1291 bool "PCI support" if MIGHT_HAVE_PCI
1293 Find out whether you have a PCI motherboard. PCI is the name of a
1294 bus system, i.e. the way the CPU talks to the other stuff inside
1295 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1296 VESA. If you have PCI, say Y, otherwise N.
1302 config PCI_DOMAINS_GENERIC
1303 def_bool PCI_DOMAINS
1305 config PCI_NANOENGINE
1306 bool "BSE nanoEngine PCI support"
1307 depends on SA1100_NANOENGINE
1309 Enable PCI on the BSE nanoEngine board.
1314 config PCI_HOST_ITE8152
1316 depends on PCI && MACH_ARMCORE
1320 source "drivers/pci/Kconfig"
1321 source "drivers/pci/pcie/Kconfig"
1323 source "drivers/pcmcia/Kconfig"
1327 menu "Kernel Features"
1332 This option should be selected by machines which have an SMP-
1335 The only effect of this option is to make the SMP-related
1336 options available to the user for configuration.
1339 bool "Symmetric Multi-Processing"
1340 depends on CPU_V6K || CPU_V7
1341 depends on GENERIC_CLOCKEVENTS
1343 depends on MMU || ARM_MPU
1346 This enables support for systems with more than one CPU. If you have
1347 a system with only one CPU, say N. If you have a system with more
1348 than one CPU, say Y.
1350 If you say N here, the kernel will run on uni- and multiprocessor
1351 machines, but will use only one CPU of a multiprocessor machine. If
1352 you say Y here, the kernel will run on many, but not all,
1353 uniprocessor machines. On a uniprocessor machine, the kernel
1354 will run faster if you say N here.
1356 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1357 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1358 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1360 If you don't know what to do here, say N.
1363 bool "Allow booting SMP kernel on uniprocessor systems"
1364 depends on SMP && !XIP_KERNEL && MMU
1367 SMP kernels contain instructions which fail on non-SMP processors.
1368 Enabling this option allows the kernel to modify itself to make
1369 these instructions safe. Disabling it allows about 1K of space
1372 If you don't know what to do here, say Y.
1374 config ARM_CPU_TOPOLOGY
1375 bool "Support cpu topology definition"
1376 depends on SMP && CPU_V7
1379 Support ARM cpu topology definition. The MPIDR register defines
1380 affinity between processors which is then used to describe the cpu
1381 topology of an ARM System.
1384 bool "Multi-core scheduler support"
1385 depends on ARM_CPU_TOPOLOGY
1387 Multi-core scheduler support improves the CPU scheduler's decision
1388 making when dealing with multi-core CPU chips at a cost of slightly
1389 increased overhead in some places. If unsure say N here.
1392 bool "SMT scheduler support"
1393 depends on ARM_CPU_TOPOLOGY
1395 Improves the CPU scheduler's decision making when dealing with
1396 MultiThreading at a cost of slightly increased overhead in some
1397 places. If unsure say N here.
1402 This option enables support for the ARM system coherency unit
1404 config HAVE_ARM_ARCH_TIMER
1405 bool "Architected timer support"
1407 select ARM_ARCH_TIMER
1408 select GENERIC_CLOCKEVENTS
1410 This option enables support for the ARM architected timer
1415 select CLKSRC_OF if OF
1417 This options enables support for the ARM timer and watchdog unit
1420 bool "Multi-Cluster Power Management"
1421 depends on CPU_V7 && SMP
1423 This option provides the common power management infrastructure
1424 for (multi-)cluster based systems, such as big.LITTLE based
1427 config MCPM_QUAD_CLUSTER
1431 To avoid wasting resources unnecessarily, MCPM only supports up
1432 to 2 clusters by default.
1433 Platforms with 3 or 4 clusters that use MCPM must select this
1434 option to allow the additional clusters to be managed.
1437 bool "big.LITTLE support (Experimental)"
1438 depends on CPU_V7 && SMP
1441 This option enables support selections for the big.LITTLE
1442 system architecture.
1445 bool "big.LITTLE switcher support"
1446 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1447 select ARM_CPU_SUSPEND
1450 The big.LITTLE "switcher" provides the core functionality to
1451 transparently handle transition between a cluster of A15's
1452 and a cluster of A7's in a big.LITTLE system.
1454 config BL_SWITCHER_DUMMY_IF
1455 tristate "Simple big.LITTLE switcher user interface"
1456 depends on BL_SWITCHER && DEBUG_KERNEL
1458 This is a simple and dummy char dev interface to control
1459 the big.LITTLE switcher core code. It is meant for
1460 debugging purposes only.
1463 prompt "Memory split"
1467 Select the desired split between kernel and user memory.
1469 If you are not absolutely sure what you are doing, leave this
1473 bool "3G/1G user/kernel split"
1475 bool "2G/2G user/kernel split"
1477 bool "1G/3G user/kernel split"
1482 default PHYS_OFFSET if !MMU
1483 default 0x40000000 if VMSPLIT_1G
1484 default 0x80000000 if VMSPLIT_2G
1488 int "Maximum number of CPUs (2-32)"
1494 bool "Support for hot-pluggable CPUs"
1497 Say Y here to experiment with turning CPUs off and on. CPUs
1498 can be controlled through /sys/devices/system/cpu.
1501 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1505 Say Y here if you want Linux to communicate with system firmware
1506 implementing the PSCI specification for CPU-centric power
1507 management operations described in ARM document number ARM DEN
1508 0022A ("Power State Coordination Interface System Software on
1511 # The GPIO number here must be sorted by descending number. In case of
1512 # a multiplatform kernel, we just want the highest value required by the
1513 # selected platforms.
1516 default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1518 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1519 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1520 default 416 if ARCH_SUNXI
1521 default 392 if ARCH_U8500
1522 default 352 if ARCH_VT8500
1523 default 288 if ARCH_ROCKCHIP
1524 default 264 if MACH_H4700
1527 Maximum number of GPIOs in the system.
1529 If unsure, leave the default value.
1531 source kernel/Kconfig.preempt
1535 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1536 ARCH_S5PV210 || ARCH_EXYNOS4
1537 default 128 if SOC_AT91RM9200
1538 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1542 depends on HZ_FIXED = 0
1543 prompt "Timer frequency"
1567 default HZ_FIXED if HZ_FIXED != 0
1568 default 100 if HZ_100
1569 default 200 if HZ_200
1570 default 250 if HZ_250
1571 default 300 if HZ_300
1572 default 500 if HZ_500
1576 def_bool HIGH_RES_TIMERS
1578 config THUMB2_KERNEL
1579 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1580 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1581 default y if CPU_THUMBONLY
1583 select ARM_ASM_UNIFIED
1586 By enabling this option, the kernel will be compiled in
1587 Thumb-2 mode. A compiler/assembler that understand the unified
1588 ARM-Thumb syntax is needed.
1592 config THUMB2_AVOID_R_ARM_THM_JUMP11
1593 bool "Work around buggy Thumb-2 short branch relocations in gas"
1594 depends on THUMB2_KERNEL && MODULES
1597 Various binutils versions can resolve Thumb-2 branches to
1598 locally-defined, preemptible global symbols as short-range "b.n"
1599 branch instructions.
1601 This is a problem, because there's no guarantee the final
1602 destination of the symbol, or any candidate locations for a
1603 trampoline, are within range of the branch. For this reason, the
1604 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1605 relocation in modules at all, and it makes little sense to add
1608 The symptom is that the kernel fails with an "unsupported
1609 relocation" error when loading some modules.
1611 Until fixed tools are available, passing
1612 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1613 code which hits this problem, at the cost of a bit of extra runtime
1614 stack usage in some cases.
1616 The problem is described in more detail at:
1617 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1619 Only Thumb-2 kernels are affected.
1621 Unless you are sure your tools don't have this problem, say Y.
1623 config ARM_ASM_UNIFIED
1627 bool "Use the ARM EABI to compile the kernel"
1629 This option allows for the kernel to be compiled using the latest
1630 ARM ABI (aka EABI). This is only useful if you are using a user
1631 space environment that is also compiled with EABI.
1633 Since there are major incompatibilities between the legacy ABI and
1634 EABI, especially with regard to structure member alignment, this
1635 option also changes the kernel syscall calling convention to
1636 disambiguate both ABIs and allow for backward compatibility support
1637 (selected with CONFIG_OABI_COMPAT).
1639 To use this you need GCC version 4.0.0 or later.
1642 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1643 depends on AEABI && !THUMB2_KERNEL
1645 This option preserves the old syscall interface along with the
1646 new (ARM EABI) one. It also provides a compatibility layer to
1647 intercept syscalls that have structure arguments which layout
1648 in memory differs between the legacy ABI and the new ARM EABI
1649 (only for non "thumb" binaries). This option adds a tiny
1650 overhead to all syscalls and produces a slightly larger kernel.
1652 The seccomp filter system will not be available when this is
1653 selected, since there is no way yet to sensibly distinguish
1654 between calling conventions during filtering.
1656 If you know you'll be using only pure EABI user space then you
1657 can say N here. If this option is not selected and you attempt
1658 to execute a legacy ABI binary then the result will be
1659 UNPREDICTABLE (in fact it can be predicted that it won't work
1660 at all). If in doubt say N.
1662 config ARCH_HAS_HOLES_MEMORYMODEL
1665 config ARCH_SPARSEMEM_ENABLE
1668 config ARCH_SPARSEMEM_DEFAULT
1669 def_bool ARCH_SPARSEMEM_ENABLE
1671 config ARCH_SELECT_MEMORY_MODEL
1672 def_bool ARCH_SPARSEMEM_ENABLE
1674 config HAVE_ARCH_PFN_VALID
1675 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1677 config HAVE_GENERIC_RCU_GUP
1682 bool "High Memory Support"
1685 The address space of ARM processors is only 4 Gigabytes large
1686 and it has to accommodate user address space, kernel address
1687 space as well as some memory mapped IO. That means that, if you
1688 have a large amount of physical memory and/or IO, not all of the
1689 memory can be "permanently mapped" by the kernel. The physical
1690 memory that is not permanently mapped is called "high memory".
1692 Depending on the selected kernel/user memory split, minimum
1693 vmalloc space and actual amount of RAM, you may not need this
1694 option which should result in a slightly faster kernel.
1699 bool "Allocate 2nd-level pagetables from highmem"
1702 The VM uses one page of physical memory for each page table.
1703 For systems with a lot of processes, this can use a lot of
1704 precious low memory, eventually leading to low memory being
1705 consumed by page tables. Setting this option will allow
1706 user-space 2nd level page tables to reside in high memory.
1708 config CPU_SW_DOMAIN_PAN
1709 bool "Enable use of CPU domains to implement privileged no-access"
1710 depends on MMU && !ARM_LPAE
1713 Increase kernel security by ensuring that normal kernel accesses
1714 are unable to access userspace addresses. This can help prevent
1715 use-after-free bugs becoming an exploitable privilege escalation
1716 by ensuring that magic values (such as LIST_POISON) will always
1717 fault when dereferenced.
1719 CPUs with low-vector mappings use a best-efforts implementation.
1720 Their lower 1MB needs to remain accessible for the vectors, but
1721 the remainder of userspace will become appropriately inaccessible.
1723 config HW_PERF_EVENTS
1727 config SYS_SUPPORTS_HUGETLBFS
1731 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1735 config ARCH_WANT_GENERAL_HUGETLB
1738 config ARM_MODULE_PLTS
1739 bool "Use PLTs to allow module memory to spill over into vmalloc area"
1742 Allocate PLTs when loading modules so that jumps and calls whose
1743 targets are too far away for their relative offsets to be encoded
1744 in the instructions themselves can be bounced via veneers in the
1745 module's PLT. This allows modules to be allocated in the generic
1746 vmalloc area after the dedicated module memory area has been
1747 exhausted. The modules will use slightly more memory, but after
1748 rounding up to page size, the actual memory footprint is usually
1751 Say y if you are getting out of memory errors while loading modules
1755 config FORCE_MAX_ZONEORDER
1756 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1757 range 11 64 if ARCH_SHMOBILE_LEGACY
1758 default "12" if SOC_AM33XX
1759 default "9" if SA1111 || ARCH_EFM32
1762 The kernel memory allocator divides physically contiguous memory
1763 blocks into "zones", where each zone is a power of two number of
1764 pages. This option selects the largest power of two that the kernel
1765 keeps in the memory allocator. If you need to allocate very large
1766 blocks of physically contiguous memory, then you may need to
1767 increase this value.
1769 This config option is actually maximum order plus one. For example,
1770 a value of 11 means that the largest free memory block is 2^10 pages.
1772 config ALIGNMENT_TRAP
1774 depends on CPU_CP15_MMU
1775 default y if !ARCH_EBSA110
1776 select HAVE_PROC_CPU if PROC_FS
1778 ARM processors cannot fetch/store information which is not
1779 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1780 address divisible by 4. On 32-bit ARM processors, these non-aligned
1781 fetch/store instructions will be emulated in software if you say
1782 here, which has a severe performance impact. This is necessary for
1783 correct operation of some network protocols. With an IP-only
1784 configuration it is safe to say N, otherwise say Y.
1786 config UACCESS_WITH_MEMCPY
1787 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1789 default y if CPU_FEROCEON
1791 Implement faster copy_to_user and clear_user methods for CPU
1792 cores where a 8-word STM instruction give significantly higher
1793 memory write throughput than a sequence of individual 32bit stores.
1795 A possible side effect is a slight increase in scheduling latency
1796 between threads sharing the same address space if they invoke
1797 such copy operations with large buffers.
1799 However, if the CPU data cache is using a write-allocate mode,
1800 this option is unlikely to provide any performance gain.
1804 prompt "Enable seccomp to safely compute untrusted bytecode"
1806 This kernel feature is useful for number crunching applications
1807 that may need to compute untrusted bytecode during their
1808 execution. By using pipes or other transports made available to
1809 the process as file descriptors supporting the read/write
1810 syscalls, it's possible to isolate those applications in
1811 their own address space using seccomp. Once seccomp is
1812 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1813 and the task is only allowed to execute a few safe syscalls
1814 defined by each seccomp mode.
1827 bool "Xen guest support on ARM"
1828 depends on ARM && AEABI && OF
1829 depends on CPU_V7 && !CPU_V6
1830 depends on !GENERIC_ATOMIC64
1832 select ARCH_DMA_ADDR_T_64BIT
1836 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1843 bool "Flattened Device Tree support"
1846 select OF_EARLY_FLATTREE
1847 select OF_RESERVED_MEM
1849 Include support for flattened device tree machine descriptions.
1852 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1855 This is the traditional way of passing data to the kernel at boot
1856 time. If you are solely relying on the flattened device tree (or
1857 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1858 to remove ATAGS support from your kernel binary. If unsure,
1861 config DEPRECATED_PARAM_STRUCT
1862 bool "Provide old way to pass kernel parameters"
1865 This was deprecated in 2001 and announced to live on for 5 years.
1866 Some old boot loaders still use this way.
1868 # Compressed boot loader in ROM. Yes, we really want to ask about
1869 # TEXT and BSS so we preserve their values in the config files.
1870 config ZBOOT_ROM_TEXT
1871 hex "Compressed ROM boot loader base address"
1874 The physical address at which the ROM-able zImage is to be
1875 placed in the target. Platforms which normally make use of
1876 ROM-able zImage formats normally set this to a suitable
1877 value in their defconfig file.
1879 If ZBOOT_ROM is not enabled, this has no effect.
1881 config ZBOOT_ROM_BSS
1882 hex "Compressed ROM boot loader BSS address"
1885 The base address of an area of read/write memory in the target
1886 for the ROM-able zImage which must be available while the
1887 decompressor is running. It must be large enough to hold the
1888 entire decompressed kernel plus an additional 128 KiB.
1889 Platforms which normally make use of ROM-able zImage formats
1890 normally set this to a suitable value in their defconfig file.
1892 If ZBOOT_ROM is not enabled, this has no effect.
1895 bool "Compressed boot loader in ROM/flash"
1896 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1897 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1899 Say Y here if you intend to execute your compressed kernel image
1900 (zImage) directly from ROM or flash. If unsure, say N.
1902 config ARM_APPENDED_DTB
1903 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1906 With this option, the boot code will look for a device tree binary
1907 (DTB) appended to zImage
1908 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1910 This is meant as a backward compatibility convenience for those
1911 systems with a bootloader that can't be upgraded to accommodate
1912 the documented boot protocol using a device tree.
1914 Beware that there is very little in terms of protection against
1915 this option being confused by leftover garbage in memory that might
1916 look like a DTB header after a reboot if no actual DTB is appended
1917 to zImage. Do not leave this option active in a production kernel
1918 if you don't intend to always append a DTB. Proper passing of the
1919 location into r2 of a bootloader provided DTB is always preferable
1922 config ARM_ATAG_DTB_COMPAT
1923 bool "Supplement the appended DTB with traditional ATAG information"
1924 depends on ARM_APPENDED_DTB
1926 Some old bootloaders can't be updated to a DTB capable one, yet
1927 they provide ATAGs with memory configuration, the ramdisk address,
1928 the kernel cmdline string, etc. Such information is dynamically
1929 provided by the bootloader and can't always be stored in a static
1930 DTB. To allow a device tree enabled kernel to be used with such
1931 bootloaders, this option allows zImage to extract the information
1932 from the ATAG list and store it at run time into the appended DTB.
1935 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1936 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1938 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1939 bool "Use bootloader kernel arguments if available"
1941 Uses the command-line options passed by the boot loader instead of
1942 the device tree bootargs property. If the boot loader doesn't provide
1943 any, the device tree bootargs property will be used.
1945 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1946 bool "Extend with bootloader kernel arguments"
1948 The command-line arguments provided by the boot loader will be
1949 appended to the the device tree bootargs property.
1954 string "Default kernel command string"
1957 On some architectures (EBSA110 and CATS), there is currently no way
1958 for the boot loader to pass arguments to the kernel. For these
1959 architectures, you should supply some command-line options at build
1960 time by entering them here. As a minimum, you should specify the
1961 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1964 prompt "Kernel command line type" if CMDLINE != ""
1965 default CMDLINE_FROM_BOOTLOADER
1968 config CMDLINE_FROM_BOOTLOADER
1969 bool "Use bootloader kernel arguments if available"
1971 Uses the command-line options passed by the boot loader. If
1972 the boot loader doesn't provide any, the default kernel command
1973 string provided in CMDLINE will be used.
1975 config CMDLINE_EXTEND
1976 bool "Extend bootloader kernel arguments"
1978 The command-line arguments provided by the boot loader will be
1979 appended to the default kernel command string.
1981 config CMDLINE_FORCE
1982 bool "Always use the default kernel command string"
1984 Always use the default kernel command string, even if the boot
1985 loader passes other arguments to the kernel.
1986 This is useful if you cannot or don't want to change the
1987 command-line options your boot loader passes to the kernel.
1991 bool "Kernel Execute-In-Place from ROM"
1992 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1994 Execute-In-Place allows the kernel to run from non-volatile storage
1995 directly addressable by the CPU, such as NOR flash. This saves RAM
1996 space since the text section of the kernel is not loaded from flash
1997 to RAM. Read-write sections, such as the data section and stack,
1998 are still copied to RAM. The XIP kernel is not compressed since
1999 it has to run directly from flash, so it will take more space to
2000 store it. The flash address used to link the kernel object files,
2001 and for storing it, is configuration dependent. Therefore, if you
2002 say Y here, you must know the proper physical address where to
2003 store the kernel image depending on your own flash memory usage.
2005 Also note that the make target becomes "make xipImage" rather than
2006 "make zImage" or "make Image". The final kernel binary to put in
2007 ROM memory will be arch/arm/boot/xipImage.
2011 config XIP_PHYS_ADDR
2012 hex "XIP Kernel Physical Location"
2013 depends on XIP_KERNEL
2014 default "0x00080000"
2016 This is the physical address in your flash memory the kernel will
2017 be linked for and stored to. This address is dependent on your
2021 bool "Kexec system call (EXPERIMENTAL)"
2022 depends on (!SMP || PM_SLEEP_SMP)
2026 kexec is a system call that implements the ability to shutdown your
2027 current kernel, and to start another kernel. It is like a reboot
2028 but it is independent of the system firmware. And like a reboot
2029 you can start any kernel with it, not just Linux.
2031 It is an ongoing process to be certain the hardware in a machine
2032 is properly shutdown, so do not be surprised if this code does not
2033 initially work for you.
2036 bool "Export atags in procfs"
2037 depends on ATAGS && KEXEC
2040 Should the atags used to boot the kernel be exported in an "atags"
2041 file in procfs. Useful with kexec.
2044 bool "Build kdump crash kernel (EXPERIMENTAL)"
2046 Generate crash dump after being started by kexec. This should
2047 be normally only set in special crash dump kernels which are
2048 loaded in the main kernel with kexec-tools into a specially
2049 reserved region and then later executed after a crash by
2050 kdump/kexec. The crash dump kernel must be compiled to a
2051 memory address not used by the main kernel
2053 For more details see Documentation/kdump/kdump.txt
2055 config AUTO_ZRELADDR
2056 bool "Auto calculation of the decompressed kernel image address"
2058 ZRELADDR is the physical address where the decompressed kernel
2059 image will be placed. If AUTO_ZRELADDR is selected, the address
2060 will be determined at run-time by masking the current IP with
2061 0xf8000000. This assumes the zImage being placed in the first 128MB
2062 from start of memory.
2066 menu "CPU Power Management"
2068 source "drivers/cpufreq/Kconfig"
2070 source "drivers/cpuidle/Kconfig"
2074 menu "Floating point emulation"
2076 comment "At least one emulation must be selected"
2079 bool "NWFPE math emulation"
2080 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2082 Say Y to include the NWFPE floating point emulator in the kernel.
2083 This is necessary to run most binaries. Linux does not currently
2084 support floating point hardware so you need to say Y here even if
2085 your machine has an FPA or floating point co-processor podule.
2087 You may say N here if you are going to load the Acorn FPEmulator
2088 early in the bootup.
2091 bool "Support extended precision"
2092 depends on FPE_NWFPE
2094 Say Y to include 80-bit support in the kernel floating-point
2095 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2096 Note that gcc does not generate 80-bit operations by default,
2097 so in most cases this option only enlarges the size of the
2098 floating point emulator without any good reason.
2100 You almost surely want to say N here.
2103 bool "FastFPE math emulation (EXPERIMENTAL)"
2104 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2106 Say Y here to include the FAST floating point emulator in the kernel.
2107 This is an experimental much faster emulator which now also has full
2108 precision for the mantissa. It does not support any exceptions.
2109 It is very simple, and approximately 3-6 times faster than NWFPE.
2111 It should be sufficient for most programs. It may be not suitable
2112 for scientific calculations, but you have to check this for yourself.
2113 If you do not feel you need a faster FP emulation you should better
2117 bool "VFP-format floating point maths"
2118 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2120 Say Y to include VFP support code in the kernel. This is needed
2121 if your hardware includes a VFP unit.
2123 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2124 release notes and additional status information.
2126 Say N if your target does not have VFP hardware.
2134 bool "Advanced SIMD (NEON) Extension support"
2135 depends on VFPv3 && CPU_V7
2137 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2140 config KERNEL_MODE_NEON
2141 bool "Support for NEON in kernel mode"
2142 depends on NEON && AEABI
2144 Say Y to include support for NEON in kernel mode.
2148 menu "Userspace binary formats"
2150 source "fs/Kconfig.binfmt"
2154 menu "Power management options"
2156 source "kernel/power/Kconfig"
2158 config ARCH_SUSPEND_POSSIBLE
2159 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2160 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2163 config ARM_CPU_SUSPEND
2166 config ARCH_HIBERNATION_POSSIBLE
2169 default y if ARCH_SUSPEND_POSSIBLE
2173 source "net/Kconfig"
2175 source "drivers/Kconfig"
2177 source "drivers/firmware/Kconfig"
2181 source "arch/arm/Kconfig.debug"
2183 source "security/Kconfig"
2185 source "crypto/Kconfig"
2187 source "arch/arm/crypto/Kconfig"
2190 source "lib/Kconfig"
2192 source "arch/arm/kvm/Kconfig"