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_MIGHT_HAVE_PC_PARPORT
9 select ARCH_SUPPORTS_ATOMIC_RMW
10 select ARCH_USE_BUILTIN_BSWAP
11 select ARCH_USE_CMPXCHG_LOCKREF
12 select ARCH_WANT_IPC_PARSE_VERSION
13 select BUILDTIME_EXTABLE_SORT if MMU
14 select CLONE_BACKWARDS
15 select CPU_PM if (SUSPEND || CPU_IDLE)
16 select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
17 select GENERIC_ALLOCATOR
18 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
19 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
20 select GENERIC_IDLE_POLL_SETUP
21 select GENERIC_IRQ_PROBE
22 select GENERIC_IRQ_SHOW
23 select GENERIC_PCI_IOMAP
24 select GENERIC_SCHED_CLOCK
25 select GENERIC_SMP_IDLE_THREAD
26 select GENERIC_STRNCPY_FROM_USER
27 select GENERIC_STRNLEN_USER
28 select HANDLE_DOMAIN_IRQ
29 select HARDIRQS_SW_RESEND
30 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
31 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
33 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
34 select HAVE_ARCH_TRACEHOOK
36 select HAVE_CC_STACKPROTECTOR
37 select HAVE_CONTEXT_TRACKING
38 select HAVE_C_RECORDMCOUNT
39 select HAVE_DEBUG_KMEMLEAK
40 select HAVE_DMA_API_DEBUG
42 select HAVE_DMA_CONTIGUOUS if MMU
43 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
44 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
45 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
46 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
47 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
48 select HAVE_GENERIC_DMA_COHERENT
49 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
50 select HAVE_IDE if PCI || ISA || PCMCIA
51 select HAVE_IRQ_TIME_ACCOUNTING
52 select HAVE_KERNEL_GZIP
53 select HAVE_KERNEL_LZ4
54 select HAVE_KERNEL_LZMA
55 select HAVE_KERNEL_LZO
57 select HAVE_KPROBES if !XIP_KERNEL
58 select HAVE_KRETPROBES if (HAVE_KPROBES)
60 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
61 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
62 select HAVE_PERF_EVENTS
64 select HAVE_PERF_USER_STACK_DUMP
65 select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
66 select HAVE_REGS_AND_STACK_ACCESS_API
67 select HAVE_SYSCALL_TRACEPOINTS
69 select HAVE_VIRT_CPU_ACCOUNTING_GEN
70 select IRQ_FORCED_THREADING
71 select MODULES_USE_ELF_REL
74 select OLD_SIGSUSPEND3
75 select PERF_USE_VMALLOC
77 select SYS_SUPPORTS_APM_EMULATION
78 # Above selects are sorted alphabetically; please add new ones
79 # according to that. Thanks.
81 The ARM series is a line of low-power-consumption RISC chip designs
82 licensed by ARM Ltd and targeted at embedded applications and
83 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
84 manufactured, but legacy ARM-based PC hardware remains popular in
85 Europe. There is an ARM Linux project with a web page at
86 <http://www.arm.linux.org.uk/>.
88 config ARM_HAS_SG_CHAIN
89 select ARCH_HAS_SG_CHAIN
92 config NEED_SG_DMA_LENGTH
95 config ARM_DMA_USE_IOMMU
97 select ARM_HAS_SG_CHAIN
98 select NEED_SG_DMA_LENGTH
102 config ARM_DMA_IOMMU_ALIGNMENT
103 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
107 DMA mapping framework by default aligns all buffers to the smallest
108 PAGE_SIZE order which is greater than or equal to the requested buffer
109 size. This works well for buffers up to a few hundreds kilobytes, but
110 for larger buffers it just a waste of address space. Drivers which has
111 relatively small addressing window (like 64Mib) might run out of
112 virtual space with just a few allocations.
114 With this parameter you can specify the maximum PAGE_SIZE order for
115 DMA IOMMU buffers. Larger buffers will be aligned only to this
116 specified order. The order is expressed as a power of two multiplied
121 config MIGHT_HAVE_PCI
124 config SYS_SUPPORTS_APM_EMULATION
129 select GENERIC_ALLOCATOR
140 The Extended Industry Standard Architecture (EISA) bus was
141 developed as an open alternative to the IBM MicroChannel bus.
143 The EISA bus provided some of the features of the IBM MicroChannel
144 bus while maintaining backward compatibility with cards made for
145 the older ISA bus. The EISA bus saw limited use between 1988 and
146 1995 when it was made obsolete by the PCI bus.
148 Say Y here if you are building a kernel for an EISA-based machine.
155 config STACKTRACE_SUPPORT
159 config HAVE_LATENCYTOP_SUPPORT
164 config LOCKDEP_SUPPORT
168 config TRACE_IRQFLAGS_SUPPORT
172 config RWSEM_XCHGADD_ALGORITHM
176 config ARCH_HAS_ILOG2_U32
179 config ARCH_HAS_ILOG2_U64
182 config ARCH_HAS_BANDGAP
185 config GENERIC_HWEIGHT
189 config GENERIC_CALIBRATE_DELAY
193 config ARCH_MAY_HAVE_PC_FDC
199 config NEED_DMA_MAP_STATE
202 config ARCH_SUPPORTS_UPROBES
205 config ARCH_HAS_DMA_SET_COHERENT_MASK
208 config GENERIC_ISA_DMA
214 config NEED_RET_TO_USER
222 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
223 default DRAM_BASE if REMAP_VECTORS_TO_RAM
226 The base address of exception vectors. This must be two pages
229 config ARM_PATCH_PHYS_VIRT
230 bool "Patch physical to virtual translations at runtime" if EMBEDDED
232 depends on !XIP_KERNEL && MMU
233 depends on !ARCH_REALVIEW || !SPARSEMEM
235 Patch phys-to-virt and virt-to-phys translation functions at
236 boot and module load time according to the position of the
237 kernel in system memory.
239 This can only be used with non-XIP MMU kernels where the base
240 of physical memory is at a 16MB boundary.
242 Only disable this option if you know that you do not require
243 this feature (eg, building a kernel for a single machine) and
244 you need to shrink the kernel to the minimal size.
246 config NEED_MACH_IO_H
249 Select this when mach/io.h is required to provide special
250 definitions for this platform. The need for mach/io.h should
251 be avoided when possible.
253 config NEED_MACH_MEMORY_H
256 Select this when mach/memory.h is required to provide special
257 definitions for this platform. The need for mach/memory.h should
258 be avoided when possible.
261 hex "Physical address of main memory" if MMU
262 depends on !ARM_PATCH_PHYS_VIRT
263 default DRAM_BASE if !MMU
264 default 0x00000000 if ARCH_EBSA110 || \
265 EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
270 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
271 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
272 default 0x20000000 if ARCH_S5PV210
273 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
274 default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
275 default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
276 default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
277 default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
279 Please provide the physical address corresponding to the
280 location of main memory in your system.
286 source "init/Kconfig"
288 source "kernel/Kconfig.freezer"
293 bool "MMU-based Paged Memory Management Support"
296 Select if you want MMU-based virtualised addressing space
297 support by paged memory management. If unsure, say 'Y'.
300 # The "ARM system type" choice list is ordered alphabetically by option
301 # text. Please add new entries in the option alphabetic order.
304 prompt "ARM system type"
305 default ARCH_VERSATILE if !MMU
306 default ARCH_MULTIPLATFORM if MMU
308 config ARCH_MULTIPLATFORM
309 bool "Allow multiple platforms to be selected"
311 select ARCH_WANT_OPTIONAL_GPIOLIB
312 select ARM_HAS_SG_CHAIN
313 select ARM_PATCH_PHYS_VIRT
317 select GENERIC_CLOCKEVENTS
318 select MIGHT_HAVE_PCI
319 select MULTI_IRQ_HANDLER
323 config ARCH_INTEGRATOR
324 bool "ARM Ltd. Integrator family"
326 select ARM_PATCH_PHYS_VIRT if MMU
329 select COMMON_CLK_VERSATILE
330 select GENERIC_CLOCKEVENTS
333 select MULTI_IRQ_HANDLER
334 select PLAT_VERSATILE
337 select VERSATILE_FPGA_IRQ
339 Support for ARM's Integrator platform.
342 bool "ARM Ltd. RealView family"
343 select ARCH_WANT_OPTIONAL_GPIOLIB
345 select ARM_TIMER_SP804
347 select COMMON_CLK_VERSATILE
348 select GENERIC_CLOCKEVENTS
349 select GPIO_PL061 if GPIOLIB
351 select NEED_MACH_MEMORY_H
352 select PLAT_VERSATILE
354 This enables support for ARM Ltd RealView boards.
356 config ARCH_VERSATILE
357 bool "ARM Ltd. Versatile family"
358 select ARCH_WANT_OPTIONAL_GPIOLIB
360 select ARM_TIMER_SP804
363 select GENERIC_CLOCKEVENTS
364 select HAVE_MACH_CLKDEV
366 select PLAT_VERSATILE
367 select PLAT_VERSATILE_CLOCK
368 select VERSATILE_FPGA_IRQ
370 This enables support for ARM Ltd Versatile board.
374 select ARCH_REQUIRE_GPIOLIB
377 select NEED_MACH_IO_H if PCCARD
379 select PINCTRL_AT91 if USE_OF
381 This enables support for systems based on Atmel
382 AT91RM9200 and AT91SAM9* processors.
385 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
386 select ARCH_REQUIRE_GPIOLIB
391 select GENERIC_CLOCKEVENTS
395 Support for Cirrus Logic 711x/721x/731x based boards.
398 bool "Cortina Systems Gemini"
399 select ARCH_REQUIRE_GPIOLIB
402 select GENERIC_CLOCKEVENTS
404 Support for the Cortina Systems Gemini family SoCs
408 select ARCH_USES_GETTIMEOFFSET
411 select NEED_MACH_IO_H
412 select NEED_MACH_MEMORY_H
415 This is an evaluation board for the StrongARM processor available
416 from Digital. It has limited hardware on-board, including an
417 Ethernet interface, two PCMCIA sockets, two serial ports and a
421 bool "Energy Micro efm32"
423 select ARCH_REQUIRE_GPIOLIB
429 select GENERIC_CLOCKEVENTS
435 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
440 select ARCH_HAS_HOLES_MEMORYMODEL
441 select ARCH_REQUIRE_GPIOLIB
442 select ARCH_USES_GETTIMEOFFSET
448 This enables support for the Cirrus EP93xx series of CPUs.
450 config ARCH_FOOTBRIDGE
454 select GENERIC_CLOCKEVENTS
456 select NEED_MACH_IO_H if !MMU
457 select NEED_MACH_MEMORY_H
459 Support for systems based on the DC21285 companion chip
460 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
463 bool "Hilscher NetX based"
467 select GENERIC_CLOCKEVENTS
469 This enables support for systems based on the Hilscher NetX Soc
475 select NEED_MACH_MEMORY_H
476 select NEED_RET_TO_USER
482 Support for Intel's IOP13XX (XScale) family of processors.
487 select ARCH_REQUIRE_GPIOLIB
490 select NEED_RET_TO_USER
494 Support for Intel's 80219 and IOP32X (XScale) family of
500 select ARCH_REQUIRE_GPIOLIB
503 select NEED_RET_TO_USER
507 Support for Intel's IOP33X (XScale) family of processors.
512 select ARCH_HAS_DMA_SET_COHERENT_MASK
513 select ARCH_REQUIRE_GPIOLIB
514 select ARCH_SUPPORTS_BIG_ENDIAN
517 select DMABOUNCE if PCI
518 select GENERIC_CLOCKEVENTS
519 select MIGHT_HAVE_PCI
520 select NEED_MACH_IO_H
521 select USB_EHCI_BIG_ENDIAN_DESC
522 select USB_EHCI_BIG_ENDIAN_MMIO
524 Support for Intel's IXP4XX (XScale) family of processors.
528 select ARCH_REQUIRE_GPIOLIB
530 select GENERIC_CLOCKEVENTS
531 select MIGHT_HAVE_PCI
535 select PLAT_ORION_LEGACY
537 Support for the Marvell Dove SoC 88AP510
540 bool "Marvell MV78xx0"
541 select ARCH_REQUIRE_GPIOLIB
543 select GENERIC_CLOCKEVENTS
546 select PLAT_ORION_LEGACY
548 Support for the following Marvell MV78xx0 series SoCs:
554 select ARCH_REQUIRE_GPIOLIB
556 select GENERIC_CLOCKEVENTS
559 select PLAT_ORION_LEGACY
561 Support for the following Marvell Orion 5x series SoCs:
562 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
563 Orion-2 (5281), Orion-1-90 (6183).
566 bool "Marvell PXA168/910/MMP2"
568 select ARCH_REQUIRE_GPIOLIB
570 select GENERIC_ALLOCATOR
571 select GENERIC_CLOCKEVENTS
574 select MULTI_IRQ_HANDLER
579 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
582 bool "Micrel/Kendin KS8695"
583 select ARCH_REQUIRE_GPIOLIB
586 select GENERIC_CLOCKEVENTS
587 select NEED_MACH_MEMORY_H
589 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
590 System-on-Chip devices.
593 bool "Nuvoton W90X900 CPU"
594 select ARCH_REQUIRE_GPIOLIB
598 select GENERIC_CLOCKEVENTS
600 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
601 At present, the w90x900 has been renamed nuc900, regarding
602 the ARM series product line, you can login the following
603 link address to know more.
605 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
606 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
610 select ARCH_REQUIRE_GPIOLIB
615 select GENERIC_CLOCKEVENTS
619 Support for the NXP LPC32XX family of processors
622 bool "PXA2xx/PXA3xx-based"
625 select ARCH_REQUIRE_GPIOLIB
626 select ARM_CPU_SUSPEND if PM
631 select GENERIC_CLOCKEVENTS
634 select MULTI_IRQ_HANDLER
638 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
641 bool "Qualcomm MSM (non-multiplatform)"
642 select ARCH_REQUIRE_GPIOLIB
644 select GENERIC_CLOCKEVENTS
646 Support for Qualcomm MSM/QSD based systems. This runs on the
647 apps processor of the MSM/QSD and depends on a shared memory
648 interface to the modem processor which runs the baseband
649 stack and controls some vital subsystems
650 (clock and power control, etc).
652 config ARCH_SHMOBILE_LEGACY
653 bool "Renesas ARM SoCs (non-multiplatform)"
655 select ARM_PATCH_PHYS_VIRT if MMU
658 select GENERIC_CLOCKEVENTS
659 select HAVE_ARM_SCU if SMP
660 select HAVE_ARM_TWD if SMP
661 select HAVE_MACH_CLKDEV
663 select MIGHT_HAVE_CACHE_L2X0
664 select MULTI_IRQ_HANDLER
667 select PM_GENERIC_DOMAINS if PM
671 Support for Renesas ARM SoC platforms using a non-multiplatform
672 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
678 select ARCH_MAY_HAVE_PC_FDC
679 select ARCH_SPARSEMEM_ENABLE
680 select ARCH_USES_GETTIMEOFFSET
684 select HAVE_PATA_PLATFORM
686 select NEED_MACH_IO_H
687 select NEED_MACH_MEMORY_H
691 On the Acorn Risc-PC, Linux can support the internal IDE disk and
692 CD-ROM interface, serial and parallel port, and the floppy drive.
697 select ARCH_REQUIRE_GPIOLIB
698 select ARCH_SPARSEMEM_ENABLE
703 select GENERIC_CLOCKEVENTS
706 select NEED_MACH_MEMORY_H
709 Support for StrongARM 11x0 based boards.
712 bool "Samsung S3C24XX SoCs"
713 select ARCH_REQUIRE_GPIOLIB
716 select CLKSRC_SAMSUNG_PWM
717 select GENERIC_CLOCKEVENTS
719 select HAVE_S3C2410_I2C if I2C
720 select HAVE_S3C2410_WATCHDOG if WATCHDOG
721 select HAVE_S3C_RTC if RTC_CLASS
722 select MULTI_IRQ_HANDLER
723 select NEED_MACH_IO_H
726 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
727 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
728 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
729 Samsung SMDK2410 development board (and derivatives).
732 bool "Samsung S3C64XX"
733 select ARCH_REQUIRE_GPIOLIB
738 select CLKSRC_SAMSUNG_PWM
739 select COMMON_CLK_SAMSUNG
741 select GENERIC_CLOCKEVENTS
743 select HAVE_S3C2410_I2C if I2C
744 select HAVE_S3C2410_WATCHDOG if WATCHDOG
748 select PM_GENERIC_DOMAINS if PM
750 select S3C_GPIO_TRACK
752 select SAMSUNG_WAKEMASK
753 select SAMSUNG_WDT_RESET
755 Samsung S3C64XX series based systems
759 select ARCH_HAS_HOLES_MEMORYMODEL
760 select ARCH_REQUIRE_GPIOLIB
762 select GENERIC_ALLOCATOR
763 select GENERIC_CLOCKEVENTS
764 select GENERIC_IRQ_CHIP
770 Support for TI's DaVinci platform.
775 select ARCH_HAS_HOLES_MEMORYMODEL
777 select ARCH_REQUIRE_GPIOLIB
780 select GENERIC_CLOCKEVENTS
781 select GENERIC_IRQ_CHIP
784 select NEED_MACH_IO_H if PCCARD
785 select NEED_MACH_MEMORY_H
787 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
791 menu "Multiple platform selection"
792 depends on ARCH_MULTIPLATFORM
794 comment "CPU Core family selection"
797 bool "ARMv4 based platforms (FA526)"
798 depends on !ARCH_MULTI_V6_V7
799 select ARCH_MULTI_V4_V5
802 config ARCH_MULTI_V4T
803 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
804 depends on !ARCH_MULTI_V6_V7
805 select ARCH_MULTI_V4_V5
806 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
807 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
808 CPU_ARM925T || CPU_ARM940T)
811 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
812 depends on !ARCH_MULTI_V6_V7
813 select ARCH_MULTI_V4_V5
814 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
815 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
816 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
818 config ARCH_MULTI_V4_V5
822 bool "ARMv6 based platforms (ARM11)"
823 select ARCH_MULTI_V6_V7
827 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
829 select ARCH_MULTI_V6_V7
833 config ARCH_MULTI_V6_V7
835 select MIGHT_HAVE_CACHE_L2X0
837 config ARCH_MULTI_CPU_AUTO
838 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
844 bool "Dummy Virtual Machine" if ARCH_MULTI_V7
848 select HAVE_ARM_ARCH_TIMER
851 # This is sorted alphabetically by mach-* pathname. However, plat-*
852 # Kconfigs may be included either alphabetically (according to the
853 # plat- suffix) or along side the corresponding mach-* source.
855 source "arch/arm/mach-mvebu/Kconfig"
857 source "arch/arm/mach-at91/Kconfig"
859 source "arch/arm/mach-axxia/Kconfig"
861 source "arch/arm/mach-bcm/Kconfig"
863 source "arch/arm/mach-berlin/Kconfig"
865 source "arch/arm/mach-clps711x/Kconfig"
867 source "arch/arm/mach-cns3xxx/Kconfig"
869 source "arch/arm/mach-davinci/Kconfig"
871 source "arch/arm/mach-dove/Kconfig"
873 source "arch/arm/mach-ep93xx/Kconfig"
875 source "arch/arm/mach-footbridge/Kconfig"
877 source "arch/arm/mach-gemini/Kconfig"
879 source "arch/arm/mach-highbank/Kconfig"
881 source "arch/arm/mach-hisi/Kconfig"
883 source "arch/arm/mach-integrator/Kconfig"
885 source "arch/arm/mach-iop32x/Kconfig"
887 source "arch/arm/mach-iop33x/Kconfig"
889 source "arch/arm/mach-iop13xx/Kconfig"
891 source "arch/arm/mach-ixp4xx/Kconfig"
893 source "arch/arm/mach-keystone/Kconfig"
895 source "arch/arm/mach-ks8695/Kconfig"
897 source "arch/arm/mach-meson/Kconfig"
899 source "arch/arm/mach-msm/Kconfig"
901 source "arch/arm/mach-moxart/Kconfig"
903 source "arch/arm/mach-mv78xx0/Kconfig"
905 source "arch/arm/mach-imx/Kconfig"
907 source "arch/arm/mach-mediatek/Kconfig"
909 source "arch/arm/mach-mxs/Kconfig"
911 source "arch/arm/mach-netx/Kconfig"
913 source "arch/arm/mach-nomadik/Kconfig"
915 source "arch/arm/mach-nspire/Kconfig"
917 source "arch/arm/plat-omap/Kconfig"
919 source "arch/arm/mach-omap1/Kconfig"
921 source "arch/arm/mach-omap2/Kconfig"
923 source "arch/arm/mach-orion5x/Kconfig"
925 source "arch/arm/mach-picoxcell/Kconfig"
927 source "arch/arm/mach-pxa/Kconfig"
928 source "arch/arm/plat-pxa/Kconfig"
930 source "arch/arm/mach-mmp/Kconfig"
932 source "arch/arm/mach-qcom/Kconfig"
934 source "arch/arm/mach-realview/Kconfig"
936 source "arch/arm/mach-rockchip/Kconfig"
938 source "arch/arm/mach-sa1100/Kconfig"
940 source "arch/arm/mach-socfpga/Kconfig"
942 source "arch/arm/mach-spear/Kconfig"
944 source "arch/arm/mach-sti/Kconfig"
946 source "arch/arm/mach-s3c24xx/Kconfig"
948 source "arch/arm/mach-s3c64xx/Kconfig"
950 source "arch/arm/mach-s5pv210/Kconfig"
952 source "arch/arm/mach-exynos/Kconfig"
953 source "arch/arm/plat-samsung/Kconfig"
955 source "arch/arm/mach-shmobile/Kconfig"
957 source "arch/arm/mach-sunxi/Kconfig"
959 source "arch/arm/mach-prima2/Kconfig"
961 source "arch/arm/mach-tegra/Kconfig"
963 source "arch/arm/mach-u300/Kconfig"
965 source "arch/arm/mach-ux500/Kconfig"
967 source "arch/arm/mach-versatile/Kconfig"
969 source "arch/arm/mach-vexpress/Kconfig"
970 source "arch/arm/plat-versatile/Kconfig"
972 source "arch/arm/mach-vt8500/Kconfig"
974 source "arch/arm/mach-w90x900/Kconfig"
976 source "arch/arm/mach-zynq/Kconfig"
978 # Definitions to make life easier
984 select GENERIC_CLOCKEVENTS
990 select GENERIC_IRQ_CHIP
993 config PLAT_ORION_LEGACY
1000 config PLAT_VERSATILE
1003 config ARM_TIMER_SP804
1006 select CLKSRC_OF if OF
1008 source "arch/arm/firmware/Kconfig"
1010 source arch/arm/mm/Kconfig
1013 bool "Enable iWMMXt support"
1014 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1015 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1017 Enable support for iWMMXt context switching at run time if
1018 running on a CPU that supports it.
1020 config MULTI_IRQ_HANDLER
1023 Allow each machine to specify it's own IRQ handler at run time.
1026 source "arch/arm/Kconfig-nommu"
1029 config PJ4B_ERRATA_4742
1030 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1031 depends on CPU_PJ4B && MACH_ARMADA_370
1034 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1035 Event (WFE) IDLE states, a specific timing sensitivity exists between
1036 the retiring WFI/WFE instructions and the newly issued subsequent
1037 instructions. This sensitivity can result in a CPU hang scenario.
1039 The software must insert either a Data Synchronization Barrier (DSB)
1040 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1043 config ARM_ERRATA_326103
1044 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1047 Executing a SWP instruction to read-only memory does not set bit 11
1048 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1049 treat the access as a read, preventing a COW from occurring and
1050 causing the faulting task to livelock.
1052 config ARM_ERRATA_411920
1053 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1054 depends on CPU_V6 || CPU_V6K
1056 Invalidation of the Instruction Cache operation can
1057 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1058 It does not affect the MPCore. This option enables the ARM Ltd.
1059 recommended workaround.
1061 config ARM_ERRATA_430973
1062 bool "ARM errata: Stale prediction on replaced interworking branch"
1065 This option enables the workaround for the 430973 Cortex-A8
1066 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1067 interworking branch is replaced with another code sequence at the
1068 same virtual address, whether due to self-modifying code or virtual
1069 to physical address re-mapping, Cortex-A8 does not recover from the
1070 stale interworking branch prediction. This results in Cortex-A8
1071 executing the new code sequence in the incorrect ARM or Thumb state.
1072 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1073 and also flushes the branch target cache at every context switch.
1074 Note that setting specific bits in the ACTLR register may not be
1075 available in non-secure mode.
1077 config ARM_ERRATA_458693
1078 bool "ARM errata: Processor deadlock when a false hazard is created"
1080 depends on !ARCH_MULTIPLATFORM
1082 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1083 erratum. For very specific sequences of memory operations, it is
1084 possible for a hazard condition intended for a cache line to instead
1085 be incorrectly associated with a different cache line. This false
1086 hazard might then cause a processor deadlock. The workaround enables
1087 the L1 caching of the NEON accesses and disables the PLD instruction
1088 in the ACTLR register. Note that setting specific bits in the ACTLR
1089 register may not be available in non-secure mode.
1091 config ARM_ERRATA_460075
1092 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1094 depends on !ARCH_MULTIPLATFORM
1096 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1097 erratum. Any asynchronous access to the L2 cache may encounter a
1098 situation in which recent store transactions to the L2 cache are lost
1099 and overwritten with stale memory contents from external memory. The
1100 workaround disables the write-allocate mode for the L2 cache via the
1101 ACTLR register. Note that setting specific bits in the ACTLR register
1102 may not be available in non-secure mode.
1104 config ARM_ERRATA_742230
1105 bool "ARM errata: DMB operation may be faulty"
1106 depends on CPU_V7 && SMP
1107 depends on !ARCH_MULTIPLATFORM
1109 This option enables the workaround for the 742230 Cortex-A9
1110 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1111 between two write operations may not ensure the correct visibility
1112 ordering of the two writes. This workaround sets a specific bit in
1113 the diagnostic register of the Cortex-A9 which causes the DMB
1114 instruction to behave as a DSB, ensuring the correct behaviour of
1117 config ARM_ERRATA_742231
1118 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1119 depends on CPU_V7 && SMP
1120 depends on !ARCH_MULTIPLATFORM
1122 This option enables the workaround for the 742231 Cortex-A9
1123 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1124 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1125 accessing some data located in the same cache line, may get corrupted
1126 data due to bad handling of the address hazard when the line gets
1127 replaced from one of the CPUs at the same time as another CPU is
1128 accessing it. This workaround sets specific bits in the diagnostic
1129 register of the Cortex-A9 which reduces the linefill issuing
1130 capabilities of the processor.
1132 config ARM_ERRATA_643719
1133 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1134 depends on CPU_V7 && SMP
1136 This option enables the workaround for the 643719 Cortex-A9 (prior to
1137 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1138 register returns zero when it should return one. The workaround
1139 corrects this value, ensuring cache maintenance operations which use
1140 it behave as intended and avoiding data corruption.
1142 config ARM_ERRATA_720789
1143 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1146 This option enables the workaround for the 720789 Cortex-A9 (prior to
1147 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1148 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1149 As a consequence of this erratum, some TLB entries which should be
1150 invalidated are not, resulting in an incoherency in the system page
1151 tables. The workaround changes the TLB flushing routines to invalidate
1152 entries regardless of the ASID.
1154 config ARM_ERRATA_743622
1155 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1157 depends on !ARCH_MULTIPLATFORM
1159 This option enables the workaround for the 743622 Cortex-A9
1160 (r2p*) erratum. Under very rare conditions, a faulty
1161 optimisation in the Cortex-A9 Store Buffer may lead to data
1162 corruption. This workaround sets a specific bit in the diagnostic
1163 register of the Cortex-A9 which disables the Store Buffer
1164 optimisation, preventing the defect from occurring. This has no
1165 visible impact on the overall performance or power consumption of the
1168 config ARM_ERRATA_751472
1169 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1171 depends on !ARCH_MULTIPLATFORM
1173 This option enables the workaround for the 751472 Cortex-A9 (prior
1174 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1175 completion of a following broadcasted operation if the second
1176 operation is received by a CPU before the ICIALLUIS has completed,
1177 potentially leading to corrupted entries in the cache or TLB.
1179 config ARM_ERRATA_754322
1180 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1183 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1184 r3p*) erratum. A speculative memory access may cause a page table walk
1185 which starts prior to an ASID switch but completes afterwards. This
1186 can populate the micro-TLB with a stale entry which may be hit with
1187 the new ASID. This workaround places two dsb instructions in the mm
1188 switching code so that no page table walks can cross the ASID switch.
1190 config ARM_ERRATA_754327
1191 bool "ARM errata: no automatic Store Buffer drain"
1192 depends on CPU_V7 && SMP
1194 This option enables the workaround for the 754327 Cortex-A9 (prior to
1195 r2p0) erratum. The Store Buffer does not have any automatic draining
1196 mechanism and therefore a livelock may occur if an external agent
1197 continuously polls a memory location waiting to observe an update.
1198 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1199 written polling loops from denying visibility of updates to memory.
1201 config ARM_ERRATA_364296
1202 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1205 This options enables the workaround for the 364296 ARM1136
1206 r0p2 erratum (possible cache data corruption with
1207 hit-under-miss enabled). It sets the undocumented bit 31 in
1208 the auxiliary control register and the FI bit in the control
1209 register, thus disabling hit-under-miss without putting the
1210 processor into full low interrupt latency mode. ARM11MPCore
1213 config ARM_ERRATA_764369
1214 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1215 depends on CPU_V7 && SMP
1217 This option enables the workaround for erratum 764369
1218 affecting Cortex-A9 MPCore with two or more processors (all
1219 current revisions). Under certain timing circumstances, a data
1220 cache line maintenance operation by MVA targeting an Inner
1221 Shareable memory region may fail to proceed up to either the
1222 Point of Coherency or to the Point of Unification of the
1223 system. This workaround adds a DSB instruction before the
1224 relevant cache maintenance functions and sets a specific bit
1225 in the diagnostic control register of the SCU.
1227 config ARM_ERRATA_775420
1228 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1231 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1232 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1233 operation aborts with MMU exception, it might cause the processor
1234 to deadlock. This workaround puts DSB before executing ISB if
1235 an abort may occur on cache maintenance.
1237 config ARM_ERRATA_798181
1238 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1239 depends on CPU_V7 && SMP
1241 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1242 adequately shooting down all use of the old entries. This
1243 option enables the Linux kernel workaround for this erratum
1244 which sends an IPI to the CPUs that are running the same ASID
1245 as the one being invalidated.
1247 config ARM_ERRATA_773022
1248 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1251 This option enables the workaround for the 773022 Cortex-A15
1252 (up to r0p4) erratum. In certain rare sequences of code, the
1253 loop buffer may deliver incorrect instructions. This
1254 workaround disables the loop buffer to avoid the erratum.
1258 source "arch/arm/common/Kconfig"
1268 Find out whether you have ISA slots on your motherboard. ISA is the
1269 name of a bus system, i.e. the way the CPU talks to the other stuff
1270 inside your box. Other bus systems are PCI, EISA, MicroChannel
1271 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1272 newer boards don't support it. If you have ISA, say Y, otherwise N.
1274 # Select ISA DMA controller support
1279 # Select ISA DMA interface
1284 bool "PCI support" if MIGHT_HAVE_PCI
1286 Find out whether you have a PCI motherboard. PCI is the name of a
1287 bus system, i.e. the way the CPU talks to the other stuff inside
1288 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1289 VESA. If you have PCI, say Y, otherwise N.
1295 config PCI_NANOENGINE
1296 bool "BSE nanoEngine PCI support"
1297 depends on SA1100_NANOENGINE
1299 Enable PCI on the BSE nanoEngine board.
1304 config PCI_HOST_ITE8152
1306 depends on PCI && MACH_ARMCORE
1310 source "drivers/pci/Kconfig"
1311 source "drivers/pci/pcie/Kconfig"
1313 source "drivers/pcmcia/Kconfig"
1317 menu "Kernel Features"
1322 This option should be selected by machines which have an SMP-
1325 The only effect of this option is to make the SMP-related
1326 options available to the user for configuration.
1329 bool "Symmetric Multi-Processing"
1330 depends on CPU_V6K || CPU_V7
1331 depends on GENERIC_CLOCKEVENTS
1333 depends on MMU || ARM_MPU
1335 This enables support for systems with more than one CPU. If you have
1336 a system with only one CPU, say N. If you have a system with more
1337 than one CPU, say Y.
1339 If you say N here, the kernel will run on uni- and multiprocessor
1340 machines, but will use only one CPU of a multiprocessor machine. If
1341 you say Y here, the kernel will run on many, but not all,
1342 uniprocessor machines. On a uniprocessor machine, the kernel
1343 will run faster if you say N here.
1345 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1346 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1347 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1349 If you don't know what to do here, say N.
1352 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1353 depends on SMP && !XIP_KERNEL && MMU
1356 SMP kernels contain instructions which fail on non-SMP processors.
1357 Enabling this option allows the kernel to modify itself to make
1358 these instructions safe. Disabling it allows about 1K of space
1361 If you don't know what to do here, say Y.
1363 config ARM_CPU_TOPOLOGY
1364 bool "Support cpu topology definition"
1365 depends on SMP && CPU_V7
1368 Support ARM cpu topology definition. The MPIDR register defines
1369 affinity between processors which is then used to describe the cpu
1370 topology of an ARM System.
1373 bool "Multi-core scheduler support"
1374 depends on ARM_CPU_TOPOLOGY
1376 Multi-core scheduler support improves the CPU scheduler's decision
1377 making when dealing with multi-core CPU chips at a cost of slightly
1378 increased overhead in some places. If unsure say N here.
1381 bool "SMT scheduler support"
1382 depends on ARM_CPU_TOPOLOGY
1384 Improves the CPU scheduler's decision making when dealing with
1385 MultiThreading at a cost of slightly increased overhead in some
1386 places. If unsure say N here.
1391 This option enables support for the ARM system coherency unit
1393 config HAVE_ARM_ARCH_TIMER
1394 bool "Architected timer support"
1396 select ARM_ARCH_TIMER
1397 select GENERIC_CLOCKEVENTS
1399 This option enables support for the ARM architected timer
1404 select CLKSRC_OF if OF
1406 This options enables support for the ARM timer and watchdog unit
1409 bool "Multi-Cluster Power Management"
1410 depends on CPU_V7 && SMP
1412 This option provides the common power management infrastructure
1413 for (multi-)cluster based systems, such as big.LITTLE based
1416 config MCPM_QUAD_CLUSTER
1420 To avoid wasting resources unnecessarily, MCPM only supports up
1421 to 2 clusters by default.
1422 Platforms with 3 or 4 clusters that use MCPM must select this
1423 option to allow the additional clusters to be managed.
1426 bool "big.LITTLE support (Experimental)"
1427 depends on CPU_V7 && SMP
1430 This option enables support selections for the big.LITTLE
1431 system architecture.
1434 bool "big.LITTLE switcher support"
1435 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1436 select ARM_CPU_SUSPEND
1439 The big.LITTLE "switcher" provides the core functionality to
1440 transparently handle transition between a cluster of A15's
1441 and a cluster of A7's in a big.LITTLE system.
1443 config BL_SWITCHER_DUMMY_IF
1444 tristate "Simple big.LITTLE switcher user interface"
1445 depends on BL_SWITCHER && DEBUG_KERNEL
1447 This is a simple and dummy char dev interface to control
1448 the big.LITTLE switcher core code. It is meant for
1449 debugging purposes only.
1452 prompt "Memory split"
1456 Select the desired split between kernel and user memory.
1458 If you are not absolutely sure what you are doing, leave this
1462 bool "3G/1G user/kernel split"
1464 bool "2G/2G user/kernel split"
1466 bool "1G/3G user/kernel split"
1471 default PHYS_OFFSET if !MMU
1472 default 0x40000000 if VMSPLIT_1G
1473 default 0x80000000 if VMSPLIT_2G
1477 int "Maximum number of CPUs (2-32)"
1483 bool "Support for hot-pluggable CPUs"
1486 Say Y here to experiment with turning CPUs off and on. CPUs
1487 can be controlled through /sys/devices/system/cpu.
1490 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1493 Say Y here if you want Linux to communicate with system firmware
1494 implementing the PSCI specification for CPU-centric power
1495 management operations described in ARM document number ARM DEN
1496 0022A ("Power State Coordination Interface System Software on
1499 # The GPIO number here must be sorted by descending number. In case of
1500 # a multiplatform kernel, we just want the highest value required by the
1501 # selected platforms.
1504 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1505 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1506 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1507 default 416 if ARCH_SUNXI
1508 default 392 if ARCH_U8500
1509 default 352 if ARCH_VT8500
1510 default 288 if ARCH_ROCKCHIP
1511 default 264 if MACH_H4700
1514 Maximum number of GPIOs in the system.
1516 If unsure, leave the default value.
1518 source kernel/Kconfig.preempt
1522 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1523 ARCH_S5PV210 || ARCH_EXYNOS4
1524 default AT91_TIMER_HZ if ARCH_AT91
1525 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1529 depends on HZ_FIXED = 0
1530 prompt "Timer frequency"
1554 default HZ_FIXED if HZ_FIXED != 0
1555 default 100 if HZ_100
1556 default 200 if HZ_200
1557 default 250 if HZ_250
1558 default 300 if HZ_300
1559 default 500 if HZ_500
1563 def_bool HIGH_RES_TIMERS
1565 config THUMB2_KERNEL
1566 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1567 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1568 default y if CPU_THUMBONLY
1570 select ARM_ASM_UNIFIED
1573 By enabling this option, the kernel will be compiled in
1574 Thumb-2 mode. A compiler/assembler that understand the unified
1575 ARM-Thumb syntax is needed.
1579 config THUMB2_AVOID_R_ARM_THM_JUMP11
1580 bool "Work around buggy Thumb-2 short branch relocations in gas"
1581 depends on THUMB2_KERNEL && MODULES
1584 Various binutils versions can resolve Thumb-2 branches to
1585 locally-defined, preemptible global symbols as short-range "b.n"
1586 branch instructions.
1588 This is a problem, because there's no guarantee the final
1589 destination of the symbol, or any candidate locations for a
1590 trampoline, are within range of the branch. For this reason, the
1591 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1592 relocation in modules at all, and it makes little sense to add
1595 The symptom is that the kernel fails with an "unsupported
1596 relocation" error when loading some modules.
1598 Until fixed tools are available, passing
1599 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1600 code which hits this problem, at the cost of a bit of extra runtime
1601 stack usage in some cases.
1603 The problem is described in more detail at:
1604 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1606 Only Thumb-2 kernels are affected.
1608 Unless you are sure your tools don't have this problem, say Y.
1610 config ARM_ASM_UNIFIED
1614 bool "Use the ARM EABI to compile the kernel"
1616 This option allows for the kernel to be compiled using the latest
1617 ARM ABI (aka EABI). This is only useful if you are using a user
1618 space environment that is also compiled with EABI.
1620 Since there are major incompatibilities between the legacy ABI and
1621 EABI, especially with regard to structure member alignment, this
1622 option also changes the kernel syscall calling convention to
1623 disambiguate both ABIs and allow for backward compatibility support
1624 (selected with CONFIG_OABI_COMPAT).
1626 To use this you need GCC version 4.0.0 or later.
1629 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1630 depends on AEABI && !THUMB2_KERNEL
1632 This option preserves the old syscall interface along with the
1633 new (ARM EABI) one. It also provides a compatibility layer to
1634 intercept syscalls that have structure arguments which layout
1635 in memory differs between the legacy ABI and the new ARM EABI
1636 (only for non "thumb" binaries). This option adds a tiny
1637 overhead to all syscalls and produces a slightly larger kernel.
1639 The seccomp filter system will not be available when this is
1640 selected, since there is no way yet to sensibly distinguish
1641 between calling conventions during filtering.
1643 If you know you'll be using only pure EABI user space then you
1644 can say N here. If this option is not selected and you attempt
1645 to execute a legacy ABI binary then the result will be
1646 UNPREDICTABLE (in fact it can be predicted that it won't work
1647 at all). If in doubt say N.
1649 config ARCH_HAS_HOLES_MEMORYMODEL
1652 config ARCH_SPARSEMEM_ENABLE
1655 config ARCH_SPARSEMEM_DEFAULT
1656 def_bool ARCH_SPARSEMEM_ENABLE
1658 config ARCH_SELECT_MEMORY_MODEL
1659 def_bool ARCH_SPARSEMEM_ENABLE
1661 config HAVE_ARCH_PFN_VALID
1662 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1664 config HAVE_GENERIC_RCU_GUP
1669 bool "High Memory Support"
1672 The address space of ARM processors is only 4 Gigabytes large
1673 and it has to accommodate user address space, kernel address
1674 space as well as some memory mapped IO. That means that, if you
1675 have a large amount of physical memory and/or IO, not all of the
1676 memory can be "permanently mapped" by the kernel. The physical
1677 memory that is not permanently mapped is called "high memory".
1679 Depending on the selected kernel/user memory split, minimum
1680 vmalloc space and actual amount of RAM, you may not need this
1681 option which should result in a slightly faster kernel.
1686 bool "Allocate 2nd-level pagetables from highmem"
1689 config HW_PERF_EVENTS
1690 bool "Enable hardware performance counter support for perf events"
1691 depends on PERF_EVENTS
1694 Enable hardware performance counter support for perf events. If
1695 disabled, perf events will use software events only.
1697 config SYS_SUPPORTS_HUGETLBFS
1701 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1705 config ARCH_WANT_GENERAL_HUGETLB
1710 config FORCE_MAX_ZONEORDER
1711 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1712 range 11 64 if ARCH_SHMOBILE_LEGACY
1713 default "12" if SOC_AM33XX
1714 default "9" if SA1111 || ARCH_EFM32
1717 The kernel memory allocator divides physically contiguous memory
1718 blocks into "zones", where each zone is a power of two number of
1719 pages. This option selects the largest power of two that the kernel
1720 keeps in the memory allocator. If you need to allocate very large
1721 blocks of physically contiguous memory, then you may need to
1722 increase this value.
1724 This config option is actually maximum order plus one. For example,
1725 a value of 11 means that the largest free memory block is 2^10 pages.
1727 config ALIGNMENT_TRAP
1729 depends on CPU_CP15_MMU
1730 default y if !ARCH_EBSA110
1731 select HAVE_PROC_CPU if PROC_FS
1733 ARM processors cannot fetch/store information which is not
1734 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1735 address divisible by 4. On 32-bit ARM processors, these non-aligned
1736 fetch/store instructions will be emulated in software if you say
1737 here, which has a severe performance impact. This is necessary for
1738 correct operation of some network protocols. With an IP-only
1739 configuration it is safe to say N, otherwise say Y.
1741 config UACCESS_WITH_MEMCPY
1742 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1744 default y if CPU_FEROCEON
1746 Implement faster copy_to_user and clear_user methods for CPU
1747 cores where a 8-word STM instruction give significantly higher
1748 memory write throughput than a sequence of individual 32bit stores.
1750 A possible side effect is a slight increase in scheduling latency
1751 between threads sharing the same address space if they invoke
1752 such copy operations with large buffers.
1754 However, if the CPU data cache is using a write-allocate mode,
1755 this option is unlikely to provide any performance gain.
1759 prompt "Enable seccomp to safely compute untrusted bytecode"
1761 This kernel feature is useful for number crunching applications
1762 that may need to compute untrusted bytecode during their
1763 execution. By using pipes or other transports made available to
1764 the process as file descriptors supporting the read/write
1765 syscalls, it's possible to isolate those applications in
1766 their own address space using seccomp. Once seccomp is
1767 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1768 and the task is only allowed to execute a few safe syscalls
1769 defined by each seccomp mode.
1782 bool "Xen guest support on ARM"
1783 depends on ARM && AEABI && OF
1784 depends on CPU_V7 && !CPU_V6
1785 depends on !GENERIC_ATOMIC64
1787 select ARCH_DMA_ADDR_T_64BIT
1791 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1798 bool "Flattened Device Tree support"
1801 select OF_EARLY_FLATTREE
1802 select OF_RESERVED_MEM
1804 Include support for flattened device tree machine descriptions.
1807 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1810 This is the traditional way of passing data to the kernel at boot
1811 time. If you are solely relying on the flattened device tree (or
1812 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1813 to remove ATAGS support from your kernel binary. If unsure,
1816 config DEPRECATED_PARAM_STRUCT
1817 bool "Provide old way to pass kernel parameters"
1820 This was deprecated in 2001 and announced to live on for 5 years.
1821 Some old boot loaders still use this way.
1823 # Compressed boot loader in ROM. Yes, we really want to ask about
1824 # TEXT and BSS so we preserve their values in the config files.
1825 config ZBOOT_ROM_TEXT
1826 hex "Compressed ROM boot loader base address"
1829 The physical address at which the ROM-able zImage is to be
1830 placed in the target. Platforms which normally make use of
1831 ROM-able zImage formats normally set this to a suitable
1832 value in their defconfig file.
1834 If ZBOOT_ROM is not enabled, this has no effect.
1836 config ZBOOT_ROM_BSS
1837 hex "Compressed ROM boot loader BSS address"
1840 The base address of an area of read/write memory in the target
1841 for the ROM-able zImage which must be available while the
1842 decompressor is running. It must be large enough to hold the
1843 entire decompressed kernel plus an additional 128 KiB.
1844 Platforms which normally make use of ROM-able zImage formats
1845 normally set this to a suitable value in their defconfig file.
1847 If ZBOOT_ROM is not enabled, this has no effect.
1850 bool "Compressed boot loader in ROM/flash"
1851 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1852 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1854 Say Y here if you intend to execute your compressed kernel image
1855 (zImage) directly from ROM or flash. If unsure, say N.
1858 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1859 depends on ZBOOT_ROM && ARCH_SH7372
1860 default ZBOOT_ROM_NONE
1862 Include experimental SD/MMC loading code in the ROM-able zImage.
1863 With this enabled it is possible to write the ROM-able zImage
1864 kernel image to an MMC or SD card and boot the kernel straight
1865 from the reset vector. At reset the processor Mask ROM will load
1866 the first part of the ROM-able zImage which in turn loads the
1867 rest the kernel image to RAM.
1869 config ZBOOT_ROM_NONE
1870 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1872 Do not load image from SD or MMC
1874 config ZBOOT_ROM_MMCIF
1875 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1877 Load image from MMCIF hardware block.
1879 config ZBOOT_ROM_SH_MOBILE_SDHI
1880 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1882 Load image from SDHI hardware block
1886 config ARM_APPENDED_DTB
1887 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1890 With this option, the boot code will look for a device tree binary
1891 (DTB) appended to zImage
1892 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1894 This is meant as a backward compatibility convenience for those
1895 systems with a bootloader that can't be upgraded to accommodate
1896 the documented boot protocol using a device tree.
1898 Beware that there is very little in terms of protection against
1899 this option being confused by leftover garbage in memory that might
1900 look like a DTB header after a reboot if no actual DTB is appended
1901 to zImage. Do not leave this option active in a production kernel
1902 if you don't intend to always append a DTB. Proper passing of the
1903 location into r2 of a bootloader provided DTB is always preferable
1906 config ARM_ATAG_DTB_COMPAT
1907 bool "Supplement the appended DTB with traditional ATAG information"
1908 depends on ARM_APPENDED_DTB
1910 Some old bootloaders can't be updated to a DTB capable one, yet
1911 they provide ATAGs with memory configuration, the ramdisk address,
1912 the kernel cmdline string, etc. Such information is dynamically
1913 provided by the bootloader and can't always be stored in a static
1914 DTB. To allow a device tree enabled kernel to be used with such
1915 bootloaders, this option allows zImage to extract the information
1916 from the ATAG list and store it at run time into the appended DTB.
1919 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1920 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1922 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1923 bool "Use bootloader kernel arguments if available"
1925 Uses the command-line options passed by the boot loader instead of
1926 the device tree bootargs property. If the boot loader doesn't provide
1927 any, the device tree bootargs property will be used.
1929 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1930 bool "Extend with bootloader kernel arguments"
1932 The command-line arguments provided by the boot loader will be
1933 appended to the the device tree bootargs property.
1938 string "Default kernel command string"
1941 On some architectures (EBSA110 and CATS), there is currently no way
1942 for the boot loader to pass arguments to the kernel. For these
1943 architectures, you should supply some command-line options at build
1944 time by entering them here. As a minimum, you should specify the
1945 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1948 prompt "Kernel command line type" if CMDLINE != ""
1949 default CMDLINE_FROM_BOOTLOADER
1952 config CMDLINE_FROM_BOOTLOADER
1953 bool "Use bootloader kernel arguments if available"
1955 Uses the command-line options passed by the boot loader. If
1956 the boot loader doesn't provide any, the default kernel command
1957 string provided in CMDLINE will be used.
1959 config CMDLINE_EXTEND
1960 bool "Extend bootloader kernel arguments"
1962 The command-line arguments provided by the boot loader will be
1963 appended to the default kernel command string.
1965 config CMDLINE_FORCE
1966 bool "Always use the default kernel command string"
1968 Always use the default kernel command string, even if the boot
1969 loader passes other arguments to the kernel.
1970 This is useful if you cannot or don't want to change the
1971 command-line options your boot loader passes to the kernel.
1975 bool "Kernel Execute-In-Place from ROM"
1976 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1978 Execute-In-Place allows the kernel to run from non-volatile storage
1979 directly addressable by the CPU, such as NOR flash. This saves RAM
1980 space since the text section of the kernel is not loaded from flash
1981 to RAM. Read-write sections, such as the data section and stack,
1982 are still copied to RAM. The XIP kernel is not compressed since
1983 it has to run directly from flash, so it will take more space to
1984 store it. The flash address used to link the kernel object files,
1985 and for storing it, is configuration dependent. Therefore, if you
1986 say Y here, you must know the proper physical address where to
1987 store the kernel image depending on your own flash memory usage.
1989 Also note that the make target becomes "make xipImage" rather than
1990 "make zImage" or "make Image". The final kernel binary to put in
1991 ROM memory will be arch/arm/boot/xipImage.
1995 config XIP_PHYS_ADDR
1996 hex "XIP Kernel Physical Location"
1997 depends on XIP_KERNEL
1998 default "0x00080000"
2000 This is the physical address in your flash memory the kernel will
2001 be linked for and stored to. This address is dependent on your
2005 bool "Kexec system call (EXPERIMENTAL)"
2006 depends on (!SMP || PM_SLEEP_SMP)
2008 kexec is a system call that implements the ability to shutdown your
2009 current kernel, and to start another kernel. It is like a reboot
2010 but it is independent of the system firmware. And like a reboot
2011 you can start any kernel with it, not just Linux.
2013 It is an ongoing process to be certain the hardware in a machine
2014 is properly shutdown, so do not be surprised if this code does not
2015 initially work for you.
2018 bool "Export atags in procfs"
2019 depends on ATAGS && KEXEC
2022 Should the atags used to boot the kernel be exported in an "atags"
2023 file in procfs. Useful with kexec.
2026 bool "Build kdump crash kernel (EXPERIMENTAL)"
2028 Generate crash dump after being started by kexec. This should
2029 be normally only set in special crash dump kernels which are
2030 loaded in the main kernel with kexec-tools into a specially
2031 reserved region and then later executed after a crash by
2032 kdump/kexec. The crash dump kernel must be compiled to a
2033 memory address not used by the main kernel
2035 For more details see Documentation/kdump/kdump.txt
2037 config AUTO_ZRELADDR
2038 bool "Auto calculation of the decompressed kernel image address"
2040 ZRELADDR is the physical address where the decompressed kernel
2041 image will be placed. If AUTO_ZRELADDR is selected, the address
2042 will be determined at run-time by masking the current IP with
2043 0xf8000000. This assumes the zImage being placed in the first 128MB
2044 from start of memory.
2048 menu "CPU Power Management"
2050 source "drivers/cpufreq/Kconfig"
2052 source "drivers/cpuidle/Kconfig"
2056 menu "Floating point emulation"
2058 comment "At least one emulation must be selected"
2061 bool "NWFPE math emulation"
2062 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2064 Say Y to include the NWFPE floating point emulator in the kernel.
2065 This is necessary to run most binaries. Linux does not currently
2066 support floating point hardware so you need to say Y here even if
2067 your machine has an FPA or floating point co-processor podule.
2069 You may say N here if you are going to load the Acorn FPEmulator
2070 early in the bootup.
2073 bool "Support extended precision"
2074 depends on FPE_NWFPE
2076 Say Y to include 80-bit support in the kernel floating-point
2077 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2078 Note that gcc does not generate 80-bit operations by default,
2079 so in most cases this option only enlarges the size of the
2080 floating point emulator without any good reason.
2082 You almost surely want to say N here.
2085 bool "FastFPE math emulation (EXPERIMENTAL)"
2086 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2088 Say Y here to include the FAST floating point emulator in the kernel.
2089 This is an experimental much faster emulator which now also has full
2090 precision for the mantissa. It does not support any exceptions.
2091 It is very simple, and approximately 3-6 times faster than NWFPE.
2093 It should be sufficient for most programs. It may be not suitable
2094 for scientific calculations, but you have to check this for yourself.
2095 If you do not feel you need a faster FP emulation you should better
2099 bool "VFP-format floating point maths"
2100 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2102 Say Y to include VFP support code in the kernel. This is needed
2103 if your hardware includes a VFP unit.
2105 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2106 release notes and additional status information.
2108 Say N if your target does not have VFP hardware.
2116 bool "Advanced SIMD (NEON) Extension support"
2117 depends on VFPv3 && CPU_V7
2119 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2122 config KERNEL_MODE_NEON
2123 bool "Support for NEON in kernel mode"
2124 depends on NEON && AEABI
2126 Say Y to include support for NEON in kernel mode.
2130 menu "Userspace binary formats"
2132 source "fs/Kconfig.binfmt"
2135 tristate "RISC OS personality"
2138 Say Y here to include the kernel code necessary if you want to run
2139 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2140 experimental; if this sounds frightening, say N and sleep in peace.
2141 You can also say M here to compile this support as a module (which
2142 will be called arthur).
2146 menu "Power management options"
2148 source "kernel/power/Kconfig"
2150 config ARCH_SUSPEND_POSSIBLE
2151 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2152 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2155 config ARM_CPU_SUSPEND
2158 config ARCH_HIBERNATION_POSSIBLE
2161 default y if ARCH_SUSPEND_POSSIBLE
2165 source "net/Kconfig"
2167 source "drivers/Kconfig"
2171 source "arch/arm/Kconfig.debug"
2173 source "security/Kconfig"
2175 source "crypto/Kconfig"
2177 source "lib/Kconfig"
2179 source "arch/arm/kvm/Kconfig"