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-digicolor/Kconfig"
865 source "arch/arm/mach-dove/Kconfig"
867 source "arch/arm/mach-ep93xx/Kconfig"
869 source "arch/arm/mach-footbridge/Kconfig"
871 source "arch/arm/mach-gemini/Kconfig"
873 source "arch/arm/mach-highbank/Kconfig"
875 source "arch/arm/mach-hisi/Kconfig"
877 source "arch/arm/mach-integrator/Kconfig"
879 source "arch/arm/mach-iop32x/Kconfig"
881 source "arch/arm/mach-iop33x/Kconfig"
883 source "arch/arm/mach-iop13xx/Kconfig"
885 source "arch/arm/mach-ixp4xx/Kconfig"
887 source "arch/arm/mach-keystone/Kconfig"
889 source "arch/arm/mach-ks8695/Kconfig"
891 source "arch/arm/mach-meson/Kconfig"
893 source "arch/arm/mach-msm/Kconfig"
895 source "arch/arm/mach-moxart/Kconfig"
897 source "arch/arm/mach-mv78xx0/Kconfig"
899 source "arch/arm/mach-imx/Kconfig"
901 source "arch/arm/mach-mediatek/Kconfig"
903 source "arch/arm/mach-mxs/Kconfig"
905 source "arch/arm/mach-netx/Kconfig"
907 source "arch/arm/mach-nomadik/Kconfig"
909 source "arch/arm/mach-nspire/Kconfig"
911 source "arch/arm/plat-omap/Kconfig"
913 source "arch/arm/mach-omap1/Kconfig"
915 source "arch/arm/mach-omap2/Kconfig"
917 source "arch/arm/mach-orion5x/Kconfig"
919 source "arch/arm/mach-picoxcell/Kconfig"
921 source "arch/arm/mach-pxa/Kconfig"
922 source "arch/arm/plat-pxa/Kconfig"
924 source "arch/arm/mach-mmp/Kconfig"
926 source "arch/arm/mach-qcom/Kconfig"
928 source "arch/arm/mach-realview/Kconfig"
930 source "arch/arm/mach-rockchip/Kconfig"
932 source "arch/arm/mach-sa1100/Kconfig"
934 source "arch/arm/mach-socfpga/Kconfig"
936 source "arch/arm/mach-spear/Kconfig"
938 source "arch/arm/mach-sti/Kconfig"
940 source "arch/arm/mach-s3c24xx/Kconfig"
942 source "arch/arm/mach-s3c64xx/Kconfig"
944 source "arch/arm/mach-s5pv210/Kconfig"
946 source "arch/arm/mach-exynos/Kconfig"
947 source "arch/arm/plat-samsung/Kconfig"
949 source "arch/arm/mach-shmobile/Kconfig"
951 source "arch/arm/mach-sunxi/Kconfig"
953 source "arch/arm/mach-prima2/Kconfig"
955 source "arch/arm/mach-tegra/Kconfig"
957 source "arch/arm/mach-u300/Kconfig"
959 source "arch/arm/mach-ux500/Kconfig"
961 source "arch/arm/mach-versatile/Kconfig"
963 source "arch/arm/mach-vexpress/Kconfig"
964 source "arch/arm/plat-versatile/Kconfig"
966 source "arch/arm/mach-vt8500/Kconfig"
968 source "arch/arm/mach-w90x900/Kconfig"
970 source "arch/arm/mach-zynq/Kconfig"
972 # Definitions to make life easier
978 select GENERIC_CLOCKEVENTS
984 select GENERIC_IRQ_CHIP
987 config PLAT_ORION_LEGACY
994 config PLAT_VERSATILE
997 config ARM_TIMER_SP804
1000 select CLKSRC_OF if OF
1002 source "arch/arm/firmware/Kconfig"
1004 source arch/arm/mm/Kconfig
1007 bool "Enable iWMMXt support"
1008 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1009 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1011 Enable support for iWMMXt context switching at run time if
1012 running on a CPU that supports it.
1014 config MULTI_IRQ_HANDLER
1017 Allow each machine to specify it's own IRQ handler at run time.
1020 source "arch/arm/Kconfig-nommu"
1023 config PJ4B_ERRATA_4742
1024 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1025 depends on CPU_PJ4B && MACH_ARMADA_370
1028 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1029 Event (WFE) IDLE states, a specific timing sensitivity exists between
1030 the retiring WFI/WFE instructions and the newly issued subsequent
1031 instructions. This sensitivity can result in a CPU hang scenario.
1033 The software must insert either a Data Synchronization Barrier (DSB)
1034 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1037 config ARM_ERRATA_326103
1038 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1041 Executing a SWP instruction to read-only memory does not set bit 11
1042 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1043 treat the access as a read, preventing a COW from occurring and
1044 causing the faulting task to livelock.
1046 config ARM_ERRATA_411920
1047 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1048 depends on CPU_V6 || CPU_V6K
1050 Invalidation of the Instruction Cache operation can
1051 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1052 It does not affect the MPCore. This option enables the ARM Ltd.
1053 recommended workaround.
1055 config ARM_ERRATA_430973
1056 bool "ARM errata: Stale prediction on replaced interworking branch"
1059 This option enables the workaround for the 430973 Cortex-A8
1060 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1061 interworking branch is replaced with another code sequence at the
1062 same virtual address, whether due to self-modifying code or virtual
1063 to physical address re-mapping, Cortex-A8 does not recover from the
1064 stale interworking branch prediction. This results in Cortex-A8
1065 executing the new code sequence in the incorrect ARM or Thumb state.
1066 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1067 and also flushes the branch target cache at every context switch.
1068 Note that setting specific bits in the ACTLR register may not be
1069 available in non-secure mode.
1071 config ARM_ERRATA_458693
1072 bool "ARM errata: Processor deadlock when a false hazard is created"
1074 depends on !ARCH_MULTIPLATFORM
1076 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1077 erratum. For very specific sequences of memory operations, it is
1078 possible for a hazard condition intended for a cache line to instead
1079 be incorrectly associated with a different cache line. This false
1080 hazard might then cause a processor deadlock. The workaround enables
1081 the L1 caching of the NEON accesses and disables the PLD instruction
1082 in the ACTLR register. Note that setting specific bits in the ACTLR
1083 register may not be available in non-secure mode.
1085 config ARM_ERRATA_460075
1086 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1088 depends on !ARCH_MULTIPLATFORM
1090 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1091 erratum. Any asynchronous access to the L2 cache may encounter a
1092 situation in which recent store transactions to the L2 cache are lost
1093 and overwritten with stale memory contents from external memory. The
1094 workaround disables the write-allocate mode for the L2 cache via the
1095 ACTLR register. Note that setting specific bits in the ACTLR register
1096 may not be available in non-secure mode.
1098 config ARM_ERRATA_742230
1099 bool "ARM errata: DMB operation may be faulty"
1100 depends on CPU_V7 && SMP
1101 depends on !ARCH_MULTIPLATFORM
1103 This option enables the workaround for the 742230 Cortex-A9
1104 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1105 between two write operations may not ensure the correct visibility
1106 ordering of the two writes. This workaround sets a specific bit in
1107 the diagnostic register of the Cortex-A9 which causes the DMB
1108 instruction to behave as a DSB, ensuring the correct behaviour of
1111 config ARM_ERRATA_742231
1112 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1113 depends on CPU_V7 && SMP
1114 depends on !ARCH_MULTIPLATFORM
1116 This option enables the workaround for the 742231 Cortex-A9
1117 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1118 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1119 accessing some data located in the same cache line, may get corrupted
1120 data due to bad handling of the address hazard when the line gets
1121 replaced from one of the CPUs at the same time as another CPU is
1122 accessing it. This workaround sets specific bits in the diagnostic
1123 register of the Cortex-A9 which reduces the linefill issuing
1124 capabilities of the processor.
1126 config ARM_ERRATA_643719
1127 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1128 depends on CPU_V7 && SMP
1130 This option enables the workaround for the 643719 Cortex-A9 (prior to
1131 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1132 register returns zero when it should return one. The workaround
1133 corrects this value, ensuring cache maintenance operations which use
1134 it behave as intended and avoiding data corruption.
1136 config ARM_ERRATA_720789
1137 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1140 This option enables the workaround for the 720789 Cortex-A9 (prior to
1141 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1142 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1143 As a consequence of this erratum, some TLB entries which should be
1144 invalidated are not, resulting in an incoherency in the system page
1145 tables. The workaround changes the TLB flushing routines to invalidate
1146 entries regardless of the ASID.
1148 config ARM_ERRATA_743622
1149 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1151 depends on !ARCH_MULTIPLATFORM
1153 This option enables the workaround for the 743622 Cortex-A9
1154 (r2p*) erratum. Under very rare conditions, a faulty
1155 optimisation in the Cortex-A9 Store Buffer may lead to data
1156 corruption. This workaround sets a specific bit in the diagnostic
1157 register of the Cortex-A9 which disables the Store Buffer
1158 optimisation, preventing the defect from occurring. This has no
1159 visible impact on the overall performance or power consumption of the
1162 config ARM_ERRATA_751472
1163 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1165 depends on !ARCH_MULTIPLATFORM
1167 This option enables the workaround for the 751472 Cortex-A9 (prior
1168 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1169 completion of a following broadcasted operation if the second
1170 operation is received by a CPU before the ICIALLUIS has completed,
1171 potentially leading to corrupted entries in the cache or TLB.
1173 config ARM_ERRATA_754322
1174 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1177 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1178 r3p*) erratum. A speculative memory access may cause a page table walk
1179 which starts prior to an ASID switch but completes afterwards. This
1180 can populate the micro-TLB with a stale entry which may be hit with
1181 the new ASID. This workaround places two dsb instructions in the mm
1182 switching code so that no page table walks can cross the ASID switch.
1184 config ARM_ERRATA_754327
1185 bool "ARM errata: no automatic Store Buffer drain"
1186 depends on CPU_V7 && SMP
1188 This option enables the workaround for the 754327 Cortex-A9 (prior to
1189 r2p0) erratum. The Store Buffer does not have any automatic draining
1190 mechanism and therefore a livelock may occur if an external agent
1191 continuously polls a memory location waiting to observe an update.
1192 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1193 written polling loops from denying visibility of updates to memory.
1195 config ARM_ERRATA_364296
1196 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1199 This options enables the workaround for the 364296 ARM1136
1200 r0p2 erratum (possible cache data corruption with
1201 hit-under-miss enabled). It sets the undocumented bit 31 in
1202 the auxiliary control register and the FI bit in the control
1203 register, thus disabling hit-under-miss without putting the
1204 processor into full low interrupt latency mode. ARM11MPCore
1207 config ARM_ERRATA_764369
1208 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1209 depends on CPU_V7 && SMP
1211 This option enables the workaround for erratum 764369
1212 affecting Cortex-A9 MPCore with two or more processors (all
1213 current revisions). Under certain timing circumstances, a data
1214 cache line maintenance operation by MVA targeting an Inner
1215 Shareable memory region may fail to proceed up to either the
1216 Point of Coherency or to the Point of Unification of the
1217 system. This workaround adds a DSB instruction before the
1218 relevant cache maintenance functions and sets a specific bit
1219 in the diagnostic control register of the SCU.
1221 config ARM_ERRATA_775420
1222 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1225 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1226 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1227 operation aborts with MMU exception, it might cause the processor
1228 to deadlock. This workaround puts DSB before executing ISB if
1229 an abort may occur on cache maintenance.
1231 config ARM_ERRATA_798181
1232 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1233 depends on CPU_V7 && SMP
1235 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1236 adequately shooting down all use of the old entries. This
1237 option enables the Linux kernel workaround for this erratum
1238 which sends an IPI to the CPUs that are running the same ASID
1239 as the one being invalidated.
1241 config ARM_ERRATA_773022
1242 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1245 This option enables the workaround for the 773022 Cortex-A15
1246 (up to r0p4) erratum. In certain rare sequences of code, the
1247 loop buffer may deliver incorrect instructions. This
1248 workaround disables the loop buffer to avoid the erratum.
1252 source "arch/arm/common/Kconfig"
1259 Find out whether you have ISA slots on your motherboard. ISA is the
1260 name of a bus system, i.e. the way the CPU talks to the other stuff
1261 inside your box. Other bus systems are PCI, EISA, MicroChannel
1262 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1263 newer boards don't support it. If you have ISA, say Y, otherwise N.
1265 # Select ISA DMA controller support
1270 # Select ISA DMA interface
1275 bool "PCI support" if MIGHT_HAVE_PCI
1277 Find out whether you have a PCI motherboard. PCI is the name of a
1278 bus system, i.e. the way the CPU talks to the other stuff inside
1279 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1280 VESA. If you have PCI, say Y, otherwise N.
1286 config PCI_DOMAINS_GENERIC
1287 def_bool PCI_DOMAINS
1289 config PCI_NANOENGINE
1290 bool "BSE nanoEngine PCI support"
1291 depends on SA1100_NANOENGINE
1293 Enable PCI on the BSE nanoEngine board.
1298 config PCI_HOST_ITE8152
1300 depends on PCI && MACH_ARMCORE
1304 source "drivers/pci/Kconfig"
1305 source "drivers/pci/pcie/Kconfig"
1307 source "drivers/pcmcia/Kconfig"
1311 menu "Kernel Features"
1316 This option should be selected by machines which have an SMP-
1319 The only effect of this option is to make the SMP-related
1320 options available to the user for configuration.
1323 bool "Symmetric Multi-Processing"
1324 depends on CPU_V6K || CPU_V7
1325 depends on GENERIC_CLOCKEVENTS
1327 depends on MMU || ARM_MPU
1329 This enables support for systems with more than one CPU. If you have
1330 a system with only one CPU, say N. If you have a system with more
1331 than one CPU, say Y.
1333 If you say N here, the kernel will run on uni- and multiprocessor
1334 machines, but will use only one CPU of a multiprocessor machine. If
1335 you say Y here, the kernel will run on many, but not all,
1336 uniprocessor machines. On a uniprocessor machine, the kernel
1337 will run faster if you say N here.
1339 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1340 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1341 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1343 If you don't know what to do here, say N.
1346 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1347 depends on SMP && !XIP_KERNEL && MMU
1350 SMP kernels contain instructions which fail on non-SMP processors.
1351 Enabling this option allows the kernel to modify itself to make
1352 these instructions safe. Disabling it allows about 1K of space
1355 If you don't know what to do here, say Y.
1357 config ARM_CPU_TOPOLOGY
1358 bool "Support cpu topology definition"
1359 depends on SMP && CPU_V7
1362 Support ARM cpu topology definition. The MPIDR register defines
1363 affinity between processors which is then used to describe the cpu
1364 topology of an ARM System.
1367 bool "Multi-core scheduler support"
1368 depends on ARM_CPU_TOPOLOGY
1370 Multi-core scheduler support improves the CPU scheduler's decision
1371 making when dealing with multi-core CPU chips at a cost of slightly
1372 increased overhead in some places. If unsure say N here.
1375 bool "SMT scheduler support"
1376 depends on ARM_CPU_TOPOLOGY
1378 Improves the CPU scheduler's decision making when dealing with
1379 MultiThreading at a cost of slightly increased overhead in some
1380 places. If unsure say N here.
1385 This option enables support for the ARM system coherency unit
1387 config HAVE_ARM_ARCH_TIMER
1388 bool "Architected timer support"
1390 select ARM_ARCH_TIMER
1391 select GENERIC_CLOCKEVENTS
1393 This option enables support for the ARM architected timer
1398 select CLKSRC_OF if OF
1400 This options enables support for the ARM timer and watchdog unit
1403 bool "Multi-Cluster Power Management"
1404 depends on CPU_V7 && SMP
1406 This option provides the common power management infrastructure
1407 for (multi-)cluster based systems, such as big.LITTLE based
1410 config MCPM_QUAD_CLUSTER
1414 To avoid wasting resources unnecessarily, MCPM only supports up
1415 to 2 clusters by default.
1416 Platforms with 3 or 4 clusters that use MCPM must select this
1417 option to allow the additional clusters to be managed.
1420 bool "big.LITTLE support (Experimental)"
1421 depends on CPU_V7 && SMP
1424 This option enables support selections for the big.LITTLE
1425 system architecture.
1428 bool "big.LITTLE switcher support"
1429 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1430 select ARM_CPU_SUSPEND
1433 The big.LITTLE "switcher" provides the core functionality to
1434 transparently handle transition between a cluster of A15's
1435 and a cluster of A7's in a big.LITTLE system.
1437 config BL_SWITCHER_DUMMY_IF
1438 tristate "Simple big.LITTLE switcher user interface"
1439 depends on BL_SWITCHER && DEBUG_KERNEL
1441 This is a simple and dummy char dev interface to control
1442 the big.LITTLE switcher core code. It is meant for
1443 debugging purposes only.
1446 prompt "Memory split"
1450 Select the desired split between kernel and user memory.
1452 If you are not absolutely sure what you are doing, leave this
1456 bool "3G/1G user/kernel split"
1458 bool "2G/2G user/kernel split"
1460 bool "1G/3G user/kernel split"
1465 default PHYS_OFFSET if !MMU
1466 default 0x40000000 if VMSPLIT_1G
1467 default 0x80000000 if VMSPLIT_2G
1471 int "Maximum number of CPUs (2-32)"
1477 bool "Support for hot-pluggable CPUs"
1480 Say Y here to experiment with turning CPUs off and on. CPUs
1481 can be controlled through /sys/devices/system/cpu.
1484 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1487 Say Y here if you want Linux to communicate with system firmware
1488 implementing the PSCI specification for CPU-centric power
1489 management operations described in ARM document number ARM DEN
1490 0022A ("Power State Coordination Interface System Software on
1493 # The GPIO number here must be sorted by descending number. In case of
1494 # a multiplatform kernel, we just want the highest value required by the
1495 # selected platforms.
1498 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA || ARCH_ZYNQ
1499 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1500 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1501 default 416 if ARCH_SUNXI
1502 default 392 if ARCH_U8500
1503 default 352 if ARCH_VT8500
1504 default 288 if ARCH_ROCKCHIP
1505 default 264 if MACH_H4700
1508 Maximum number of GPIOs in the system.
1510 If unsure, leave the default value.
1512 source kernel/Kconfig.preempt
1516 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1517 ARCH_S5PV210 || ARCH_EXYNOS4
1518 default AT91_TIMER_HZ if ARCH_AT91
1519 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1523 depends on HZ_FIXED = 0
1524 prompt "Timer frequency"
1548 default HZ_FIXED if HZ_FIXED != 0
1549 default 100 if HZ_100
1550 default 200 if HZ_200
1551 default 250 if HZ_250
1552 default 300 if HZ_300
1553 default 500 if HZ_500
1557 def_bool HIGH_RES_TIMERS
1559 config THUMB2_KERNEL
1560 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1561 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1562 default y if CPU_THUMBONLY
1564 select ARM_ASM_UNIFIED
1567 By enabling this option, the kernel will be compiled in
1568 Thumb-2 mode. A compiler/assembler that understand the unified
1569 ARM-Thumb syntax is needed.
1573 config THUMB2_AVOID_R_ARM_THM_JUMP11
1574 bool "Work around buggy Thumb-2 short branch relocations in gas"
1575 depends on THUMB2_KERNEL && MODULES
1578 Various binutils versions can resolve Thumb-2 branches to
1579 locally-defined, preemptible global symbols as short-range "b.n"
1580 branch instructions.
1582 This is a problem, because there's no guarantee the final
1583 destination of the symbol, or any candidate locations for a
1584 trampoline, are within range of the branch. For this reason, the
1585 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1586 relocation in modules at all, and it makes little sense to add
1589 The symptom is that the kernel fails with an "unsupported
1590 relocation" error when loading some modules.
1592 Until fixed tools are available, passing
1593 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1594 code which hits this problem, at the cost of a bit of extra runtime
1595 stack usage in some cases.
1597 The problem is described in more detail at:
1598 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1600 Only Thumb-2 kernels are affected.
1602 Unless you are sure your tools don't have this problem, say Y.
1604 config ARM_ASM_UNIFIED
1608 bool "Use the ARM EABI to compile the kernel"
1610 This option allows for the kernel to be compiled using the latest
1611 ARM ABI (aka EABI). This is only useful if you are using a user
1612 space environment that is also compiled with EABI.
1614 Since there are major incompatibilities between the legacy ABI and
1615 EABI, especially with regard to structure member alignment, this
1616 option also changes the kernel syscall calling convention to
1617 disambiguate both ABIs and allow for backward compatibility support
1618 (selected with CONFIG_OABI_COMPAT).
1620 To use this you need GCC version 4.0.0 or later.
1623 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1624 depends on AEABI && !THUMB2_KERNEL
1626 This option preserves the old syscall interface along with the
1627 new (ARM EABI) one. It also provides a compatibility layer to
1628 intercept syscalls that have structure arguments which layout
1629 in memory differs between the legacy ABI and the new ARM EABI
1630 (only for non "thumb" binaries). This option adds a tiny
1631 overhead to all syscalls and produces a slightly larger kernel.
1633 The seccomp filter system will not be available when this is
1634 selected, since there is no way yet to sensibly distinguish
1635 between calling conventions during filtering.
1637 If you know you'll be using only pure EABI user space then you
1638 can say N here. If this option is not selected and you attempt
1639 to execute a legacy ABI binary then the result will be
1640 UNPREDICTABLE (in fact it can be predicted that it won't work
1641 at all). If in doubt say N.
1643 config ARCH_HAS_HOLES_MEMORYMODEL
1646 config ARCH_SPARSEMEM_ENABLE
1649 config ARCH_SPARSEMEM_DEFAULT
1650 def_bool ARCH_SPARSEMEM_ENABLE
1652 config ARCH_SELECT_MEMORY_MODEL
1653 def_bool ARCH_SPARSEMEM_ENABLE
1655 config HAVE_ARCH_PFN_VALID
1656 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1658 config HAVE_GENERIC_RCU_GUP
1663 bool "High Memory Support"
1666 The address space of ARM processors is only 4 Gigabytes large
1667 and it has to accommodate user address space, kernel address
1668 space as well as some memory mapped IO. That means that, if you
1669 have a large amount of physical memory and/or IO, not all of the
1670 memory can be "permanently mapped" by the kernel. The physical
1671 memory that is not permanently mapped is called "high memory".
1673 Depending on the selected kernel/user memory split, minimum
1674 vmalloc space and actual amount of RAM, you may not need this
1675 option which should result in a slightly faster kernel.
1680 bool "Allocate 2nd-level pagetables from highmem"
1683 config HW_PERF_EVENTS
1684 bool "Enable hardware performance counter support for perf events"
1685 depends on PERF_EVENTS
1688 Enable hardware performance counter support for perf events. If
1689 disabled, perf events will use software events only.
1691 config SYS_SUPPORTS_HUGETLBFS
1695 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1699 config ARCH_WANT_GENERAL_HUGETLB
1704 config FORCE_MAX_ZONEORDER
1705 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1706 range 11 64 if ARCH_SHMOBILE_LEGACY
1707 default "12" if SOC_AM33XX
1708 default "9" if SA1111 || ARCH_EFM32
1711 The kernel memory allocator divides physically contiguous memory
1712 blocks into "zones", where each zone is a power of two number of
1713 pages. This option selects the largest power of two that the kernel
1714 keeps in the memory allocator. If you need to allocate very large
1715 blocks of physically contiguous memory, then you may need to
1716 increase this value.
1718 This config option is actually maximum order plus one. For example,
1719 a value of 11 means that the largest free memory block is 2^10 pages.
1721 config ALIGNMENT_TRAP
1723 depends on CPU_CP15_MMU
1724 default y if !ARCH_EBSA110
1725 select HAVE_PROC_CPU if PROC_FS
1727 ARM processors cannot fetch/store information which is not
1728 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1729 address divisible by 4. On 32-bit ARM processors, these non-aligned
1730 fetch/store instructions will be emulated in software if you say
1731 here, which has a severe performance impact. This is necessary for
1732 correct operation of some network protocols. With an IP-only
1733 configuration it is safe to say N, otherwise say Y.
1735 config UACCESS_WITH_MEMCPY
1736 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1738 default y if CPU_FEROCEON
1740 Implement faster copy_to_user and clear_user methods for CPU
1741 cores where a 8-word STM instruction give significantly higher
1742 memory write throughput than a sequence of individual 32bit stores.
1744 A possible side effect is a slight increase in scheduling latency
1745 between threads sharing the same address space if they invoke
1746 such copy operations with large buffers.
1748 However, if the CPU data cache is using a write-allocate mode,
1749 this option is unlikely to provide any performance gain.
1753 prompt "Enable seccomp to safely compute untrusted bytecode"
1755 This kernel feature is useful for number crunching applications
1756 that may need to compute untrusted bytecode during their
1757 execution. By using pipes or other transports made available to
1758 the process as file descriptors supporting the read/write
1759 syscalls, it's possible to isolate those applications in
1760 their own address space using seccomp. Once seccomp is
1761 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1762 and the task is only allowed to execute a few safe syscalls
1763 defined by each seccomp mode.
1776 bool "Xen guest support on ARM"
1777 depends on ARM && AEABI && OF
1778 depends on CPU_V7 && !CPU_V6
1779 depends on !GENERIC_ATOMIC64
1781 select ARCH_DMA_ADDR_T_64BIT
1785 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1792 bool "Flattened Device Tree support"
1795 select OF_EARLY_FLATTREE
1796 select OF_RESERVED_MEM
1798 Include support for flattened device tree machine descriptions.
1801 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1804 This is the traditional way of passing data to the kernel at boot
1805 time. If you are solely relying on the flattened device tree (or
1806 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1807 to remove ATAGS support from your kernel binary. If unsure,
1810 config DEPRECATED_PARAM_STRUCT
1811 bool "Provide old way to pass kernel parameters"
1814 This was deprecated in 2001 and announced to live on for 5 years.
1815 Some old boot loaders still use this way.
1817 # Compressed boot loader in ROM. Yes, we really want to ask about
1818 # TEXT and BSS so we preserve their values in the config files.
1819 config ZBOOT_ROM_TEXT
1820 hex "Compressed ROM boot loader base address"
1823 The physical address at which the ROM-able zImage is to be
1824 placed in the target. Platforms which normally make use of
1825 ROM-able zImage formats normally set this to a suitable
1826 value in their defconfig file.
1828 If ZBOOT_ROM is not enabled, this has no effect.
1830 config ZBOOT_ROM_BSS
1831 hex "Compressed ROM boot loader BSS address"
1834 The base address of an area of read/write memory in the target
1835 for the ROM-able zImage which must be available while the
1836 decompressor is running. It must be large enough to hold the
1837 entire decompressed kernel plus an additional 128 KiB.
1838 Platforms which normally make use of ROM-able zImage formats
1839 normally set this to a suitable value in their defconfig file.
1841 If ZBOOT_ROM is not enabled, this has no effect.
1844 bool "Compressed boot loader in ROM/flash"
1845 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1846 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1848 Say Y here if you intend to execute your compressed kernel image
1849 (zImage) directly from ROM or flash. If unsure, say N.
1852 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1853 depends on ZBOOT_ROM && ARCH_SH7372
1854 default ZBOOT_ROM_NONE
1856 Include experimental SD/MMC loading code in the ROM-able zImage.
1857 With this enabled it is possible to write the ROM-able zImage
1858 kernel image to an MMC or SD card and boot the kernel straight
1859 from the reset vector. At reset the processor Mask ROM will load
1860 the first part of the ROM-able zImage which in turn loads the
1861 rest the kernel image to RAM.
1863 config ZBOOT_ROM_NONE
1864 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1866 Do not load image from SD or MMC
1868 config ZBOOT_ROM_MMCIF
1869 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1871 Load image from MMCIF hardware block.
1873 config ZBOOT_ROM_SH_MOBILE_SDHI
1874 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1876 Load image from SDHI hardware block
1880 config ARM_APPENDED_DTB
1881 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1884 With this option, the boot code will look for a device tree binary
1885 (DTB) appended to zImage
1886 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1888 This is meant as a backward compatibility convenience for those
1889 systems with a bootloader that can't be upgraded to accommodate
1890 the documented boot protocol using a device tree.
1892 Beware that there is very little in terms of protection against
1893 this option being confused by leftover garbage in memory that might
1894 look like a DTB header after a reboot if no actual DTB is appended
1895 to zImage. Do not leave this option active in a production kernel
1896 if you don't intend to always append a DTB. Proper passing of the
1897 location into r2 of a bootloader provided DTB is always preferable
1900 config ARM_ATAG_DTB_COMPAT
1901 bool "Supplement the appended DTB with traditional ATAG information"
1902 depends on ARM_APPENDED_DTB
1904 Some old bootloaders can't be updated to a DTB capable one, yet
1905 they provide ATAGs with memory configuration, the ramdisk address,
1906 the kernel cmdline string, etc. Such information is dynamically
1907 provided by the bootloader and can't always be stored in a static
1908 DTB. To allow a device tree enabled kernel to be used with such
1909 bootloaders, this option allows zImage to extract the information
1910 from the ATAG list and store it at run time into the appended DTB.
1913 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1914 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1916 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1917 bool "Use bootloader kernel arguments if available"
1919 Uses the command-line options passed by the boot loader instead of
1920 the device tree bootargs property. If the boot loader doesn't provide
1921 any, the device tree bootargs property will be used.
1923 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1924 bool "Extend with bootloader kernel arguments"
1926 The command-line arguments provided by the boot loader will be
1927 appended to the the device tree bootargs property.
1932 string "Default kernel command string"
1935 On some architectures (EBSA110 and CATS), there is currently no way
1936 for the boot loader to pass arguments to the kernel. For these
1937 architectures, you should supply some command-line options at build
1938 time by entering them here. As a minimum, you should specify the
1939 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1942 prompt "Kernel command line type" if CMDLINE != ""
1943 default CMDLINE_FROM_BOOTLOADER
1946 config CMDLINE_FROM_BOOTLOADER
1947 bool "Use bootloader kernel arguments if available"
1949 Uses the command-line options passed by the boot loader. If
1950 the boot loader doesn't provide any, the default kernel command
1951 string provided in CMDLINE will be used.
1953 config CMDLINE_EXTEND
1954 bool "Extend bootloader kernel arguments"
1956 The command-line arguments provided by the boot loader will be
1957 appended to the default kernel command string.
1959 config CMDLINE_FORCE
1960 bool "Always use the default kernel command string"
1962 Always use the default kernel command string, even if the boot
1963 loader passes other arguments to the kernel.
1964 This is useful if you cannot or don't want to change the
1965 command-line options your boot loader passes to the kernel.
1969 bool "Kernel Execute-In-Place from ROM"
1970 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1972 Execute-In-Place allows the kernel to run from non-volatile storage
1973 directly addressable by the CPU, such as NOR flash. This saves RAM
1974 space since the text section of the kernel is not loaded from flash
1975 to RAM. Read-write sections, such as the data section and stack,
1976 are still copied to RAM. The XIP kernel is not compressed since
1977 it has to run directly from flash, so it will take more space to
1978 store it. The flash address used to link the kernel object files,
1979 and for storing it, is configuration dependent. Therefore, if you
1980 say Y here, you must know the proper physical address where to
1981 store the kernel image depending on your own flash memory usage.
1983 Also note that the make target becomes "make xipImage" rather than
1984 "make zImage" or "make Image". The final kernel binary to put in
1985 ROM memory will be arch/arm/boot/xipImage.
1989 config XIP_PHYS_ADDR
1990 hex "XIP Kernel Physical Location"
1991 depends on XIP_KERNEL
1992 default "0x00080000"
1994 This is the physical address in your flash memory the kernel will
1995 be linked for and stored to. This address is dependent on your
1999 bool "Kexec system call (EXPERIMENTAL)"
2000 depends on (!SMP || PM_SLEEP_SMP)
2002 kexec is a system call that implements the ability to shutdown your
2003 current kernel, and to start another kernel. It is like a reboot
2004 but it is independent of the system firmware. And like a reboot
2005 you can start any kernel with it, not just Linux.
2007 It is an ongoing process to be certain the hardware in a machine
2008 is properly shutdown, so do not be surprised if this code does not
2009 initially work for you.
2012 bool "Export atags in procfs"
2013 depends on ATAGS && KEXEC
2016 Should the atags used to boot the kernel be exported in an "atags"
2017 file in procfs. Useful with kexec.
2020 bool "Build kdump crash kernel (EXPERIMENTAL)"
2022 Generate crash dump after being started by kexec. This should
2023 be normally only set in special crash dump kernels which are
2024 loaded in the main kernel with kexec-tools into a specially
2025 reserved region and then later executed after a crash by
2026 kdump/kexec. The crash dump kernel must be compiled to a
2027 memory address not used by the main kernel
2029 For more details see Documentation/kdump/kdump.txt
2031 config AUTO_ZRELADDR
2032 bool "Auto calculation of the decompressed kernel image address"
2034 ZRELADDR is the physical address where the decompressed kernel
2035 image will be placed. If AUTO_ZRELADDR is selected, the address
2036 will be determined at run-time by masking the current IP with
2037 0xf8000000. This assumes the zImage being placed in the first 128MB
2038 from start of memory.
2042 menu "CPU Power Management"
2044 source "drivers/cpufreq/Kconfig"
2046 source "drivers/cpuidle/Kconfig"
2050 menu "Floating point emulation"
2052 comment "At least one emulation must be selected"
2055 bool "NWFPE math emulation"
2056 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2058 Say Y to include the NWFPE floating point emulator in the kernel.
2059 This is necessary to run most binaries. Linux does not currently
2060 support floating point hardware so you need to say Y here even if
2061 your machine has an FPA or floating point co-processor podule.
2063 You may say N here if you are going to load the Acorn FPEmulator
2064 early in the bootup.
2067 bool "Support extended precision"
2068 depends on FPE_NWFPE
2070 Say Y to include 80-bit support in the kernel floating-point
2071 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2072 Note that gcc does not generate 80-bit operations by default,
2073 so in most cases this option only enlarges the size of the
2074 floating point emulator without any good reason.
2076 You almost surely want to say N here.
2079 bool "FastFPE math emulation (EXPERIMENTAL)"
2080 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2082 Say Y here to include the FAST floating point emulator in the kernel.
2083 This is an experimental much faster emulator which now also has full
2084 precision for the mantissa. It does not support any exceptions.
2085 It is very simple, and approximately 3-6 times faster than NWFPE.
2087 It should be sufficient for most programs. It may be not suitable
2088 for scientific calculations, but you have to check this for yourself.
2089 If you do not feel you need a faster FP emulation you should better
2093 bool "VFP-format floating point maths"
2094 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2096 Say Y to include VFP support code in the kernel. This is needed
2097 if your hardware includes a VFP unit.
2099 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2100 release notes and additional status information.
2102 Say N if your target does not have VFP hardware.
2110 bool "Advanced SIMD (NEON) Extension support"
2111 depends on VFPv3 && CPU_V7
2113 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2116 config KERNEL_MODE_NEON
2117 bool "Support for NEON in kernel mode"
2118 depends on NEON && AEABI
2120 Say Y to include support for NEON in kernel mode.
2124 menu "Userspace binary formats"
2126 source "fs/Kconfig.binfmt"
2129 tristate "RISC OS personality"
2132 Say Y here to include the kernel code necessary if you want to run
2133 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2134 experimental; if this sounds frightening, say N and sleep in peace.
2135 You can also say M here to compile this support as a module (which
2136 will be called arthur).
2140 menu "Power management options"
2142 source "kernel/power/Kconfig"
2144 config ARCH_SUSPEND_POSSIBLE
2145 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2146 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2149 config ARM_CPU_SUSPEND
2152 config ARCH_HIBERNATION_POSSIBLE
2155 default y if ARCH_SUSPEND_POSSIBLE
2159 source "net/Kconfig"
2161 source "drivers/Kconfig"
2165 source "arch/arm/Kconfig.debug"
2167 source "security/Kconfig"
2169 source "crypto/Kconfig"
2171 source "lib/Kconfig"
2173 source "arch/arm/kvm/Kconfig"