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_REGS_AND_STACK_ACCESS_API
66 select HAVE_SYSCALL_TRACEPOINTS
68 select HAVE_VIRT_CPU_ACCOUNTING_GEN
69 select IRQ_FORCED_THREADING
70 select MODULES_USE_ELF_REL
73 select OLD_SIGSUSPEND3
74 select PERF_USE_VMALLOC
76 select SYS_SUPPORTS_APM_EMULATION
77 # Above selects are sorted alphabetically; please add new ones
78 # according to that. Thanks.
80 The ARM series is a line of low-power-consumption RISC chip designs
81 licensed by ARM Ltd and targeted at embedded applications and
82 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
83 manufactured, but legacy ARM-based PC hardware remains popular in
84 Europe. There is an ARM Linux project with a web page at
85 <http://www.arm.linux.org.uk/>.
87 config ARM_HAS_SG_CHAIN
88 select ARCH_HAS_SG_CHAIN
91 config NEED_SG_DMA_LENGTH
94 config ARM_DMA_USE_IOMMU
96 select ARM_HAS_SG_CHAIN
97 select NEED_SG_DMA_LENGTH
101 config ARM_DMA_IOMMU_ALIGNMENT
102 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
106 DMA mapping framework by default aligns all buffers to the smallest
107 PAGE_SIZE order which is greater than or equal to the requested buffer
108 size. This works well for buffers up to a few hundreds kilobytes, but
109 for larger buffers it just a waste of address space. Drivers which has
110 relatively small addressing window (like 64Mib) might run out of
111 virtual space with just a few allocations.
113 With this parameter you can specify the maximum PAGE_SIZE order for
114 DMA IOMMU buffers. Larger buffers will be aligned only to this
115 specified order. The order is expressed as a power of two multiplied
120 config MIGHT_HAVE_PCI
123 config SYS_SUPPORTS_APM_EMULATION
128 select GENERIC_ALLOCATOR
139 The Extended Industry Standard Architecture (EISA) bus was
140 developed as an open alternative to the IBM MicroChannel bus.
142 The EISA bus provided some of the features of the IBM MicroChannel
143 bus while maintaining backward compatibility with cards made for
144 the older ISA bus. The EISA bus saw limited use between 1988 and
145 1995 when it was made obsolete by the PCI bus.
147 Say Y here if you are building a kernel for an EISA-based machine.
154 config STACKTRACE_SUPPORT
158 config HAVE_LATENCYTOP_SUPPORT
163 config LOCKDEP_SUPPORT
167 config TRACE_IRQFLAGS_SUPPORT
171 config RWSEM_XCHGADD_ALGORITHM
175 config ARCH_HAS_ILOG2_U32
178 config ARCH_HAS_ILOG2_U64
181 config ARCH_HAS_BANDGAP
184 config GENERIC_HWEIGHT
188 config GENERIC_CALIBRATE_DELAY
192 config ARCH_MAY_HAVE_PC_FDC
198 config NEED_DMA_MAP_STATE
201 config ARCH_SUPPORTS_UPROBES
204 config ARCH_HAS_DMA_SET_COHERENT_MASK
207 config GENERIC_ISA_DMA
213 config NEED_RET_TO_USER
221 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
222 default DRAM_BASE if REMAP_VECTORS_TO_RAM
225 The base address of exception vectors. This must be two pages
228 config ARM_PATCH_PHYS_VIRT
229 bool "Patch physical to virtual translations at runtime" if EMBEDDED
231 depends on !XIP_KERNEL && MMU
232 depends on !ARCH_REALVIEW || !SPARSEMEM
234 Patch phys-to-virt and virt-to-phys translation functions at
235 boot and module load time according to the position of the
236 kernel in system memory.
238 This can only be used with non-XIP MMU kernels where the base
239 of physical memory is at a 16MB boundary.
241 Only disable this option if you know that you do not require
242 this feature (eg, building a kernel for a single machine) and
243 you need to shrink the kernel to the minimal size.
245 config NEED_MACH_IO_H
248 Select this when mach/io.h is required to provide special
249 definitions for this platform. The need for mach/io.h should
250 be avoided when possible.
252 config NEED_MACH_MEMORY_H
255 Select this when mach/memory.h is required to provide special
256 definitions for this platform. The need for mach/memory.h should
257 be avoided when possible.
260 hex "Physical address of main memory" if MMU
261 depends on !ARM_PATCH_PHYS_VIRT
262 default DRAM_BASE if !MMU
263 default 0x00000000 if ARCH_EBSA110 || \
264 EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
269 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
270 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
271 default 0x20000000 if ARCH_S5PV210
272 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
273 default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
274 default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
275 default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
276 default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
278 Please provide the physical address corresponding to the
279 location of main memory in your system.
285 source "init/Kconfig"
287 source "kernel/Kconfig.freezer"
292 bool "MMU-based Paged Memory Management Support"
295 Select if you want MMU-based virtualised addressing space
296 support by paged memory management. If unsure, say 'Y'.
299 # The "ARM system type" choice list is ordered alphabetically by option
300 # text. Please add new entries in the option alphabetic order.
303 prompt "ARM system type"
304 default ARCH_VERSATILE if !MMU
305 default ARCH_MULTIPLATFORM if MMU
307 config ARCH_MULTIPLATFORM
308 bool "Allow multiple platforms to be selected"
310 select ARCH_WANT_OPTIONAL_GPIOLIB
311 select ARM_HAS_SG_CHAIN
312 select ARM_PATCH_PHYS_VIRT
316 select GENERIC_CLOCKEVENTS
317 select MIGHT_HAVE_PCI
318 select MULTI_IRQ_HANDLER
322 config ARCH_INTEGRATOR
323 bool "ARM Ltd. Integrator family"
325 select ARM_PATCH_PHYS_VIRT if MMU
328 select COMMON_CLK_VERSATILE
329 select GENERIC_CLOCKEVENTS
332 select MULTI_IRQ_HANDLER
333 select PLAT_VERSATILE
336 select VERSATILE_FPGA_IRQ
338 Support for ARM's Integrator platform.
341 bool "ARM Ltd. RealView family"
342 select ARCH_WANT_OPTIONAL_GPIOLIB
344 select ARM_TIMER_SP804
346 select COMMON_CLK_VERSATILE
347 select GENERIC_CLOCKEVENTS
348 select GPIO_PL061 if GPIOLIB
350 select NEED_MACH_MEMORY_H
351 select PLAT_VERSATILE
353 This enables support for ARM Ltd RealView boards.
355 config ARCH_VERSATILE
356 bool "ARM Ltd. Versatile family"
357 select ARCH_WANT_OPTIONAL_GPIOLIB
359 select ARM_TIMER_SP804
362 select GENERIC_CLOCKEVENTS
363 select HAVE_MACH_CLKDEV
365 select PLAT_VERSATILE
366 select PLAT_VERSATILE_CLOCK
367 select VERSATILE_FPGA_IRQ
369 This enables support for ARM Ltd Versatile board.
373 select ARCH_REQUIRE_GPIOLIB
376 select NEED_MACH_IO_H if PCCARD
378 select PINCTRL_AT91 if USE_OF
380 This enables support for systems based on Atmel
381 AT91RM9200 and AT91SAM9* processors.
384 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
385 select ARCH_REQUIRE_GPIOLIB
390 select GENERIC_CLOCKEVENTS
394 Support for Cirrus Logic 711x/721x/731x based boards.
397 bool "Cortina Systems Gemini"
398 select ARCH_REQUIRE_GPIOLIB
401 select GENERIC_CLOCKEVENTS
403 Support for the Cortina Systems Gemini family SoCs
407 select ARCH_USES_GETTIMEOFFSET
410 select NEED_MACH_IO_H
411 select NEED_MACH_MEMORY_H
414 This is an evaluation board for the StrongARM processor available
415 from Digital. It has limited hardware on-board, including an
416 Ethernet interface, two PCMCIA sockets, two serial ports and a
420 bool "Energy Micro efm32"
422 select ARCH_REQUIRE_GPIOLIB
428 select GENERIC_CLOCKEVENTS
434 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
439 select ARCH_HAS_HOLES_MEMORYMODEL
440 select ARCH_REQUIRE_GPIOLIB
441 select ARCH_USES_GETTIMEOFFSET
447 This enables support for the Cirrus EP93xx series of CPUs.
449 config ARCH_FOOTBRIDGE
453 select GENERIC_CLOCKEVENTS
455 select NEED_MACH_IO_H if !MMU
456 select NEED_MACH_MEMORY_H
458 Support for systems based on the DC21285 companion chip
459 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
462 bool "Hilscher NetX based"
466 select GENERIC_CLOCKEVENTS
468 This enables support for systems based on the Hilscher NetX Soc
474 select NEED_MACH_MEMORY_H
475 select NEED_RET_TO_USER
481 Support for Intel's IOP13XX (XScale) family of processors.
486 select ARCH_REQUIRE_GPIOLIB
489 select NEED_RET_TO_USER
493 Support for Intel's 80219 and IOP32X (XScale) family of
499 select ARCH_REQUIRE_GPIOLIB
502 select NEED_RET_TO_USER
506 Support for Intel's IOP33X (XScale) family of processors.
511 select ARCH_HAS_DMA_SET_COHERENT_MASK
512 select ARCH_REQUIRE_GPIOLIB
513 select ARCH_SUPPORTS_BIG_ENDIAN
516 select DMABOUNCE if PCI
517 select GENERIC_CLOCKEVENTS
518 select MIGHT_HAVE_PCI
519 select NEED_MACH_IO_H
520 select USB_EHCI_BIG_ENDIAN_DESC
521 select USB_EHCI_BIG_ENDIAN_MMIO
523 Support for Intel's IXP4XX (XScale) family of processors.
527 select ARCH_REQUIRE_GPIOLIB
529 select GENERIC_CLOCKEVENTS
530 select MIGHT_HAVE_PCI
534 select PLAT_ORION_LEGACY
536 Support for the Marvell Dove SoC 88AP510
539 bool "Marvell MV78xx0"
540 select ARCH_REQUIRE_GPIOLIB
542 select GENERIC_CLOCKEVENTS
545 select PLAT_ORION_LEGACY
547 Support for the following Marvell MV78xx0 series SoCs:
553 select ARCH_REQUIRE_GPIOLIB
555 select GENERIC_CLOCKEVENTS
558 select PLAT_ORION_LEGACY
560 Support for the following Marvell Orion 5x series SoCs:
561 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
562 Orion-2 (5281), Orion-1-90 (6183).
565 bool "Marvell PXA168/910/MMP2"
567 select ARCH_REQUIRE_GPIOLIB
569 select GENERIC_ALLOCATOR
570 select GENERIC_CLOCKEVENTS
573 select MULTI_IRQ_HANDLER
578 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
581 bool "Micrel/Kendin KS8695"
582 select ARCH_REQUIRE_GPIOLIB
585 select GENERIC_CLOCKEVENTS
586 select NEED_MACH_MEMORY_H
588 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
589 System-on-Chip devices.
592 bool "Nuvoton W90X900 CPU"
593 select ARCH_REQUIRE_GPIOLIB
597 select GENERIC_CLOCKEVENTS
599 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
600 At present, the w90x900 has been renamed nuc900, regarding
601 the ARM series product line, you can login the following
602 link address to know more.
604 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
605 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
609 select ARCH_REQUIRE_GPIOLIB
614 select GENERIC_CLOCKEVENTS
618 Support for the NXP LPC32XX family of processors
621 bool "PXA2xx/PXA3xx-based"
624 select ARCH_REQUIRE_GPIOLIB
625 select ARM_CPU_SUSPEND if PM
630 select GENERIC_CLOCKEVENTS
633 select MULTI_IRQ_HANDLER
637 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
640 bool "Qualcomm MSM (non-multiplatform)"
641 select ARCH_REQUIRE_GPIOLIB
643 select GENERIC_CLOCKEVENTS
645 Support for Qualcomm MSM/QSD based systems. This runs on the
646 apps processor of the MSM/QSD and depends on a shared memory
647 interface to the modem processor which runs the baseband
648 stack and controls some vital subsystems
649 (clock and power control, etc).
651 config ARCH_SHMOBILE_LEGACY
652 bool "Renesas ARM SoCs (non-multiplatform)"
654 select ARM_PATCH_PHYS_VIRT if MMU
657 select GENERIC_CLOCKEVENTS
658 select HAVE_ARM_SCU if SMP
659 select HAVE_ARM_TWD if SMP
660 select HAVE_MACH_CLKDEV
662 select MIGHT_HAVE_CACHE_L2X0
663 select MULTI_IRQ_HANDLER
666 select PM_GENERIC_DOMAINS if PM
670 Support for Renesas ARM SoC platforms using a non-multiplatform
671 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
677 select ARCH_MAY_HAVE_PC_FDC
678 select ARCH_SPARSEMEM_ENABLE
679 select ARCH_USES_GETTIMEOFFSET
683 select HAVE_PATA_PLATFORM
685 select NEED_MACH_IO_H
686 select NEED_MACH_MEMORY_H
690 On the Acorn Risc-PC, Linux can support the internal IDE disk and
691 CD-ROM interface, serial and parallel port, and the floppy drive.
696 select ARCH_REQUIRE_GPIOLIB
697 select ARCH_SPARSEMEM_ENABLE
702 select GENERIC_CLOCKEVENTS
705 select NEED_MACH_MEMORY_H
708 Support for StrongARM 11x0 based boards.
711 bool "Samsung S3C24XX SoCs"
712 select ARCH_REQUIRE_GPIOLIB
715 select CLKSRC_SAMSUNG_PWM
716 select GENERIC_CLOCKEVENTS
718 select HAVE_S3C2410_I2C if I2C
719 select HAVE_S3C2410_WATCHDOG if WATCHDOG
720 select HAVE_S3C_RTC if RTC_CLASS
721 select MULTI_IRQ_HANDLER
722 select NEED_MACH_IO_H
725 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
726 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
727 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
728 Samsung SMDK2410 development board (and derivatives).
731 bool "Samsung S3C64XX"
732 select ARCH_REQUIRE_GPIOLIB
737 select CLKSRC_SAMSUNG_PWM
738 select COMMON_CLK_SAMSUNG
740 select GENERIC_CLOCKEVENTS
742 select HAVE_S3C2410_I2C if I2C
743 select HAVE_S3C2410_WATCHDOG if WATCHDOG
747 select PM_GENERIC_DOMAINS if PM
749 select S3C_GPIO_TRACK
751 select SAMSUNG_WAKEMASK
752 select SAMSUNG_WDT_RESET
754 Samsung S3C64XX series based systems
758 select ARCH_HAS_HOLES_MEMORYMODEL
759 select ARCH_REQUIRE_GPIOLIB
761 select GENERIC_ALLOCATOR
762 select GENERIC_CLOCKEVENTS
763 select GENERIC_IRQ_CHIP
769 Support for TI's DaVinci platform.
774 select ARCH_HAS_HOLES_MEMORYMODEL
776 select ARCH_REQUIRE_GPIOLIB
779 select GENERIC_CLOCKEVENTS
780 select GENERIC_IRQ_CHIP
783 select NEED_MACH_IO_H if PCCARD
784 select NEED_MACH_MEMORY_H
786 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
790 menu "Multiple platform selection"
791 depends on ARCH_MULTIPLATFORM
793 comment "CPU Core family selection"
796 bool "ARMv4 based platforms (FA526)"
797 depends on !ARCH_MULTI_V6_V7
798 select ARCH_MULTI_V4_V5
801 config ARCH_MULTI_V4T
802 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
803 depends on !ARCH_MULTI_V6_V7
804 select ARCH_MULTI_V4_V5
805 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
806 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
807 CPU_ARM925T || CPU_ARM940T)
810 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
811 depends on !ARCH_MULTI_V6_V7
812 select ARCH_MULTI_V4_V5
813 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
814 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
815 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
817 config ARCH_MULTI_V4_V5
821 bool "ARMv6 based platforms (ARM11)"
822 select ARCH_MULTI_V6_V7
826 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
828 select ARCH_MULTI_V6_V7
832 config ARCH_MULTI_V6_V7
834 select MIGHT_HAVE_CACHE_L2X0
836 config ARCH_MULTI_CPU_AUTO
837 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
843 bool "Dummy Virtual Machine" if ARCH_MULTI_V7
847 select HAVE_ARM_ARCH_TIMER
850 # This is sorted alphabetically by mach-* pathname. However, plat-*
851 # Kconfigs may be included either alphabetically (according to the
852 # plat- suffix) or along side the corresponding mach-* source.
854 source "arch/arm/mach-mvebu/Kconfig"
856 source "arch/arm/mach-at91/Kconfig"
858 source "arch/arm/mach-axxia/Kconfig"
860 source "arch/arm/mach-bcm/Kconfig"
862 source "arch/arm/mach-berlin/Kconfig"
864 source "arch/arm/mach-clps711x/Kconfig"
866 source "arch/arm/mach-cns3xxx/Kconfig"
868 source "arch/arm/mach-davinci/Kconfig"
870 source "arch/arm/mach-dove/Kconfig"
872 source "arch/arm/mach-ep93xx/Kconfig"
874 source "arch/arm/mach-footbridge/Kconfig"
876 source "arch/arm/mach-gemini/Kconfig"
878 source "arch/arm/mach-highbank/Kconfig"
880 source "arch/arm/mach-hisi/Kconfig"
882 source "arch/arm/mach-integrator/Kconfig"
884 source "arch/arm/mach-iop32x/Kconfig"
886 source "arch/arm/mach-iop33x/Kconfig"
888 source "arch/arm/mach-iop13xx/Kconfig"
890 source "arch/arm/mach-ixp4xx/Kconfig"
892 source "arch/arm/mach-keystone/Kconfig"
894 source "arch/arm/mach-ks8695/Kconfig"
896 source "arch/arm/mach-meson/Kconfig"
898 source "arch/arm/mach-msm/Kconfig"
900 source "arch/arm/mach-moxart/Kconfig"
902 source "arch/arm/mach-mv78xx0/Kconfig"
904 source "arch/arm/mach-imx/Kconfig"
906 source "arch/arm/mach-mediatek/Kconfig"
908 source "arch/arm/mach-mxs/Kconfig"
910 source "arch/arm/mach-netx/Kconfig"
912 source "arch/arm/mach-nomadik/Kconfig"
914 source "arch/arm/mach-nspire/Kconfig"
916 source "arch/arm/plat-omap/Kconfig"
918 source "arch/arm/mach-omap1/Kconfig"
920 source "arch/arm/mach-omap2/Kconfig"
922 source "arch/arm/mach-orion5x/Kconfig"
924 source "arch/arm/mach-picoxcell/Kconfig"
926 source "arch/arm/mach-pxa/Kconfig"
927 source "arch/arm/plat-pxa/Kconfig"
929 source "arch/arm/mach-mmp/Kconfig"
931 source "arch/arm/mach-qcom/Kconfig"
933 source "arch/arm/mach-realview/Kconfig"
935 source "arch/arm/mach-rockchip/Kconfig"
937 source "arch/arm/mach-sa1100/Kconfig"
939 source "arch/arm/mach-socfpga/Kconfig"
941 source "arch/arm/mach-spear/Kconfig"
943 source "arch/arm/mach-sti/Kconfig"
945 source "arch/arm/mach-s3c24xx/Kconfig"
947 source "arch/arm/mach-s3c64xx/Kconfig"
949 source "arch/arm/mach-s5pv210/Kconfig"
951 source "arch/arm/mach-exynos/Kconfig"
952 source "arch/arm/plat-samsung/Kconfig"
954 source "arch/arm/mach-shmobile/Kconfig"
956 source "arch/arm/mach-sunxi/Kconfig"
958 source "arch/arm/mach-prima2/Kconfig"
960 source "arch/arm/mach-tegra/Kconfig"
962 source "arch/arm/mach-u300/Kconfig"
964 source "arch/arm/mach-ux500/Kconfig"
966 source "arch/arm/mach-versatile/Kconfig"
968 source "arch/arm/mach-vexpress/Kconfig"
969 source "arch/arm/plat-versatile/Kconfig"
971 source "arch/arm/mach-vt8500/Kconfig"
973 source "arch/arm/mach-w90x900/Kconfig"
975 source "arch/arm/mach-zynq/Kconfig"
977 # Definitions to make life easier
983 select GENERIC_CLOCKEVENTS
989 select GENERIC_IRQ_CHIP
992 config PLAT_ORION_LEGACY
999 config PLAT_VERSATILE
1002 config ARM_TIMER_SP804
1005 select CLKSRC_OF if OF
1007 source "arch/arm/firmware/Kconfig"
1009 source arch/arm/mm/Kconfig
1012 bool "Enable iWMMXt support"
1013 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1014 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1016 Enable support for iWMMXt context switching at run time if
1017 running on a CPU that supports it.
1019 config MULTI_IRQ_HANDLER
1022 Allow each machine to specify it's own IRQ handler at run time.
1025 source "arch/arm/Kconfig-nommu"
1028 config PJ4B_ERRATA_4742
1029 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1030 depends on CPU_PJ4B && MACH_ARMADA_370
1033 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1034 Event (WFE) IDLE states, a specific timing sensitivity exists between
1035 the retiring WFI/WFE instructions and the newly issued subsequent
1036 instructions. This sensitivity can result in a CPU hang scenario.
1038 The software must insert either a Data Synchronization Barrier (DSB)
1039 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1042 config ARM_ERRATA_326103
1043 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1046 Executing a SWP instruction to read-only memory does not set bit 11
1047 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1048 treat the access as a read, preventing a COW from occurring and
1049 causing the faulting task to livelock.
1051 config ARM_ERRATA_411920
1052 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1053 depends on CPU_V6 || CPU_V6K
1055 Invalidation of the Instruction Cache operation can
1056 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1057 It does not affect the MPCore. This option enables the ARM Ltd.
1058 recommended workaround.
1060 config ARM_ERRATA_430973
1061 bool "ARM errata: Stale prediction on replaced interworking branch"
1064 This option enables the workaround for the 430973 Cortex-A8
1065 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1066 interworking branch is replaced with another code sequence at the
1067 same virtual address, whether due to self-modifying code or virtual
1068 to physical address re-mapping, Cortex-A8 does not recover from the
1069 stale interworking branch prediction. This results in Cortex-A8
1070 executing the new code sequence in the incorrect ARM or Thumb state.
1071 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1072 and also flushes the branch target cache at every context switch.
1073 Note that setting specific bits in the ACTLR register may not be
1074 available in non-secure mode.
1076 config ARM_ERRATA_458693
1077 bool "ARM errata: Processor deadlock when a false hazard is created"
1079 depends on !ARCH_MULTIPLATFORM
1081 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1082 erratum. For very specific sequences of memory operations, it is
1083 possible for a hazard condition intended for a cache line to instead
1084 be incorrectly associated with a different cache line. This false
1085 hazard might then cause a processor deadlock. The workaround enables
1086 the L1 caching of the NEON accesses and disables the PLD instruction
1087 in the ACTLR register. Note that setting specific bits in the ACTLR
1088 register may not be available in non-secure mode.
1090 config ARM_ERRATA_460075
1091 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1093 depends on !ARCH_MULTIPLATFORM
1095 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1096 erratum. Any asynchronous access to the L2 cache may encounter a
1097 situation in which recent store transactions to the L2 cache are lost
1098 and overwritten with stale memory contents from external memory. The
1099 workaround disables the write-allocate mode for the L2 cache via the
1100 ACTLR register. Note that setting specific bits in the ACTLR register
1101 may not be available in non-secure mode.
1103 config ARM_ERRATA_742230
1104 bool "ARM errata: DMB operation may be faulty"
1105 depends on CPU_V7 && SMP
1106 depends on !ARCH_MULTIPLATFORM
1108 This option enables the workaround for the 742230 Cortex-A9
1109 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1110 between two write operations may not ensure the correct visibility
1111 ordering of the two writes. This workaround sets a specific bit in
1112 the diagnostic register of the Cortex-A9 which causes the DMB
1113 instruction to behave as a DSB, ensuring the correct behaviour of
1116 config ARM_ERRATA_742231
1117 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1118 depends on CPU_V7 && SMP
1119 depends on !ARCH_MULTIPLATFORM
1121 This option enables the workaround for the 742231 Cortex-A9
1122 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1123 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1124 accessing some data located in the same cache line, may get corrupted
1125 data due to bad handling of the address hazard when the line gets
1126 replaced from one of the CPUs at the same time as another CPU is
1127 accessing it. This workaround sets specific bits in the diagnostic
1128 register of the Cortex-A9 which reduces the linefill issuing
1129 capabilities of the processor.
1131 config ARM_ERRATA_643719
1132 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1133 depends on CPU_V7 && SMP
1135 This option enables the workaround for the 643719 Cortex-A9 (prior to
1136 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1137 register returns zero when it should return one. The workaround
1138 corrects this value, ensuring cache maintenance operations which use
1139 it behave as intended and avoiding data corruption.
1141 config ARM_ERRATA_720789
1142 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1145 This option enables the workaround for the 720789 Cortex-A9 (prior to
1146 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1147 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1148 As a consequence of this erratum, some TLB entries which should be
1149 invalidated are not, resulting in an incoherency in the system page
1150 tables. The workaround changes the TLB flushing routines to invalidate
1151 entries regardless of the ASID.
1153 config ARM_ERRATA_743622
1154 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1156 depends on !ARCH_MULTIPLATFORM
1158 This option enables the workaround for the 743622 Cortex-A9
1159 (r2p*) erratum. Under very rare conditions, a faulty
1160 optimisation in the Cortex-A9 Store Buffer may lead to data
1161 corruption. This workaround sets a specific bit in the diagnostic
1162 register of the Cortex-A9 which disables the Store Buffer
1163 optimisation, preventing the defect from occurring. This has no
1164 visible impact on the overall performance or power consumption of the
1167 config ARM_ERRATA_751472
1168 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1170 depends on !ARCH_MULTIPLATFORM
1172 This option enables the workaround for the 751472 Cortex-A9 (prior
1173 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1174 completion of a following broadcasted operation if the second
1175 operation is received by a CPU before the ICIALLUIS has completed,
1176 potentially leading to corrupted entries in the cache or TLB.
1178 config ARM_ERRATA_754322
1179 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1182 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1183 r3p*) erratum. A speculative memory access may cause a page table walk
1184 which starts prior to an ASID switch but completes afterwards. This
1185 can populate the micro-TLB with a stale entry which may be hit with
1186 the new ASID. This workaround places two dsb instructions in the mm
1187 switching code so that no page table walks can cross the ASID switch.
1189 config ARM_ERRATA_754327
1190 bool "ARM errata: no automatic Store Buffer drain"
1191 depends on CPU_V7 && SMP
1193 This option enables the workaround for the 754327 Cortex-A9 (prior to
1194 r2p0) erratum. The Store Buffer does not have any automatic draining
1195 mechanism and therefore a livelock may occur if an external agent
1196 continuously polls a memory location waiting to observe an update.
1197 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1198 written polling loops from denying visibility of updates to memory.
1200 config ARM_ERRATA_364296
1201 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1204 This options enables the workaround for the 364296 ARM1136
1205 r0p2 erratum (possible cache data corruption with
1206 hit-under-miss enabled). It sets the undocumented bit 31 in
1207 the auxiliary control register and the FI bit in the control
1208 register, thus disabling hit-under-miss without putting the
1209 processor into full low interrupt latency mode. ARM11MPCore
1212 config ARM_ERRATA_764369
1213 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1214 depends on CPU_V7 && SMP
1216 This option enables the workaround for erratum 764369
1217 affecting Cortex-A9 MPCore with two or more processors (all
1218 current revisions). Under certain timing circumstances, a data
1219 cache line maintenance operation by MVA targeting an Inner
1220 Shareable memory region may fail to proceed up to either the
1221 Point of Coherency or to the Point of Unification of the
1222 system. This workaround adds a DSB instruction before the
1223 relevant cache maintenance functions and sets a specific bit
1224 in the diagnostic control register of the SCU.
1226 config ARM_ERRATA_775420
1227 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1230 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1231 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1232 operation aborts with MMU exception, it might cause the processor
1233 to deadlock. This workaround puts DSB before executing ISB if
1234 an abort may occur on cache maintenance.
1236 config ARM_ERRATA_798181
1237 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1238 depends on CPU_V7 && SMP
1240 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1241 adequately shooting down all use of the old entries. This
1242 option enables the Linux kernel workaround for this erratum
1243 which sends an IPI to the CPUs that are running the same ASID
1244 as the one being invalidated.
1246 config ARM_ERRATA_773022
1247 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1250 This option enables the workaround for the 773022 Cortex-A15
1251 (up to r0p4) erratum. In certain rare sequences of code, the
1252 loop buffer may deliver incorrect instructions. This
1253 workaround disables the loop buffer to avoid the erratum.
1257 source "arch/arm/common/Kconfig"
1267 Find out whether you have ISA slots on your motherboard. ISA is the
1268 name of a bus system, i.e. the way the CPU talks to the other stuff
1269 inside your box. Other bus systems are PCI, EISA, MicroChannel
1270 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1271 newer boards don't support it. If you have ISA, say Y, otherwise N.
1273 # Select ISA DMA controller support
1278 # Select ISA DMA interface
1283 bool "PCI support" if MIGHT_HAVE_PCI
1285 Find out whether you have a PCI motherboard. PCI is the name of a
1286 bus system, i.e. the way the CPU talks to the other stuff inside
1287 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1288 VESA. If you have PCI, say Y, otherwise N.
1294 config PCI_NANOENGINE
1295 bool "BSE nanoEngine PCI support"
1296 depends on SA1100_NANOENGINE
1298 Enable PCI on the BSE nanoEngine board.
1303 config PCI_HOST_ITE8152
1305 depends on PCI && MACH_ARMCORE
1309 source "drivers/pci/Kconfig"
1310 source "drivers/pci/pcie/Kconfig"
1312 source "drivers/pcmcia/Kconfig"
1316 menu "Kernel Features"
1321 This option should be selected by machines which have an SMP-
1324 The only effect of this option is to make the SMP-related
1325 options available to the user for configuration.
1328 bool "Symmetric Multi-Processing"
1329 depends on CPU_V6K || CPU_V7
1330 depends on GENERIC_CLOCKEVENTS
1332 depends on MMU || ARM_MPU
1334 This enables support for systems with more than one CPU. If you have
1335 a system with only one CPU, say N. If you have a system with more
1336 than one CPU, say Y.
1338 If you say N here, the kernel will run on uni- and multiprocessor
1339 machines, but will use only one CPU of a multiprocessor machine. If
1340 you say Y here, the kernel will run on many, but not all,
1341 uniprocessor machines. On a uniprocessor machine, the kernel
1342 will run faster if you say N here.
1344 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1345 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1346 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1348 If you don't know what to do here, say N.
1351 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1352 depends on SMP && !XIP_KERNEL && MMU
1355 SMP kernels contain instructions which fail on non-SMP processors.
1356 Enabling this option allows the kernel to modify itself to make
1357 these instructions safe. Disabling it allows about 1K of space
1360 If you don't know what to do here, say Y.
1362 config ARM_CPU_TOPOLOGY
1363 bool "Support cpu topology definition"
1364 depends on SMP && CPU_V7
1367 Support ARM cpu topology definition. The MPIDR register defines
1368 affinity between processors which is then used to describe the cpu
1369 topology of an ARM System.
1372 bool "Multi-core scheduler support"
1373 depends on ARM_CPU_TOPOLOGY
1375 Multi-core scheduler support improves the CPU scheduler's decision
1376 making when dealing with multi-core CPU chips at a cost of slightly
1377 increased overhead in some places. If unsure say N here.
1380 bool "SMT scheduler support"
1381 depends on ARM_CPU_TOPOLOGY
1383 Improves the CPU scheduler's decision making when dealing with
1384 MultiThreading at a cost of slightly increased overhead in some
1385 places. If unsure say N here.
1390 This option enables support for the ARM system coherency unit
1392 config HAVE_ARM_ARCH_TIMER
1393 bool "Architected timer support"
1395 select ARM_ARCH_TIMER
1396 select GENERIC_CLOCKEVENTS
1398 This option enables support for the ARM architected timer
1403 select CLKSRC_OF if OF
1405 This options enables support for the ARM timer and watchdog unit
1408 bool "Multi-Cluster Power Management"
1409 depends on CPU_V7 && SMP
1411 This option provides the common power management infrastructure
1412 for (multi-)cluster based systems, such as big.LITTLE based
1415 config MCPM_QUAD_CLUSTER
1419 To avoid wasting resources unnecessarily, MCPM only supports up
1420 to 2 clusters by default.
1421 Platforms with 3 or 4 clusters that use MCPM must select this
1422 option to allow the additional clusters to be managed.
1425 bool "big.LITTLE support (Experimental)"
1426 depends on CPU_V7 && SMP
1429 This option enables support selections for the big.LITTLE
1430 system architecture.
1433 bool "big.LITTLE switcher support"
1434 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1435 select ARM_CPU_SUSPEND
1438 The big.LITTLE "switcher" provides the core functionality to
1439 transparently handle transition between a cluster of A15's
1440 and a cluster of A7's in a big.LITTLE system.
1442 config BL_SWITCHER_DUMMY_IF
1443 tristate "Simple big.LITTLE switcher user interface"
1444 depends on BL_SWITCHER && DEBUG_KERNEL
1446 This is a simple and dummy char dev interface to control
1447 the big.LITTLE switcher core code. It is meant for
1448 debugging purposes only.
1451 prompt "Memory split"
1455 Select the desired split between kernel and user memory.
1457 If you are not absolutely sure what you are doing, leave this
1461 bool "3G/1G user/kernel split"
1463 bool "2G/2G user/kernel split"
1465 bool "1G/3G user/kernel split"
1470 default PHYS_OFFSET if !MMU
1471 default 0x40000000 if VMSPLIT_1G
1472 default 0x80000000 if VMSPLIT_2G
1476 int "Maximum number of CPUs (2-32)"
1482 bool "Support for hot-pluggable CPUs"
1485 Say Y here to experiment with turning CPUs off and on. CPUs
1486 can be controlled through /sys/devices/system/cpu.
1489 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1492 Say Y here if you want Linux to communicate with system firmware
1493 implementing the PSCI specification for CPU-centric power
1494 management operations described in ARM document number ARM DEN
1495 0022A ("Power State Coordination Interface System Software on
1498 # The GPIO number here must be sorted by descending number. In case of
1499 # a multiplatform kernel, we just want the highest value required by the
1500 # selected platforms.
1503 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1504 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1505 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1506 default 416 if ARCH_SUNXI
1507 default 392 if ARCH_U8500
1508 default 352 if ARCH_VT8500
1509 default 288 if ARCH_ROCKCHIP
1510 default 264 if MACH_H4700
1513 Maximum number of GPIOs in the system.
1515 If unsure, leave the default value.
1517 source kernel/Kconfig.preempt
1521 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
1522 ARCH_S5PV210 || ARCH_EXYNOS4
1523 default AT91_TIMER_HZ if ARCH_AT91
1524 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1528 depends on HZ_FIXED = 0
1529 prompt "Timer frequency"
1553 default HZ_FIXED if HZ_FIXED != 0
1554 default 100 if HZ_100
1555 default 200 if HZ_200
1556 default 250 if HZ_250
1557 default 300 if HZ_300
1558 default 500 if HZ_500
1562 def_bool HIGH_RES_TIMERS
1564 config THUMB2_KERNEL
1565 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1566 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1567 default y if CPU_THUMBONLY
1569 select ARM_ASM_UNIFIED
1572 By enabling this option, the kernel will be compiled in
1573 Thumb-2 mode. A compiler/assembler that understand the unified
1574 ARM-Thumb syntax is needed.
1578 config THUMB2_AVOID_R_ARM_THM_JUMP11
1579 bool "Work around buggy Thumb-2 short branch relocations in gas"
1580 depends on THUMB2_KERNEL && MODULES
1583 Various binutils versions can resolve Thumb-2 branches to
1584 locally-defined, preemptible global symbols as short-range "b.n"
1585 branch instructions.
1587 This is a problem, because there's no guarantee the final
1588 destination of the symbol, or any candidate locations for a
1589 trampoline, are within range of the branch. For this reason, the
1590 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1591 relocation in modules at all, and it makes little sense to add
1594 The symptom is that the kernel fails with an "unsupported
1595 relocation" error when loading some modules.
1597 Until fixed tools are available, passing
1598 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1599 code which hits this problem, at the cost of a bit of extra runtime
1600 stack usage in some cases.
1602 The problem is described in more detail at:
1603 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1605 Only Thumb-2 kernels are affected.
1607 Unless you are sure your tools don't have this problem, say Y.
1609 config ARM_ASM_UNIFIED
1613 bool "Use the ARM EABI to compile the kernel"
1615 This option allows for the kernel to be compiled using the latest
1616 ARM ABI (aka EABI). This is only useful if you are using a user
1617 space environment that is also compiled with EABI.
1619 Since there are major incompatibilities between the legacy ABI and
1620 EABI, especially with regard to structure member alignment, this
1621 option also changes the kernel syscall calling convention to
1622 disambiguate both ABIs and allow for backward compatibility support
1623 (selected with CONFIG_OABI_COMPAT).
1625 To use this you need GCC version 4.0.0 or later.
1628 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1629 depends on AEABI && !THUMB2_KERNEL
1631 This option preserves the old syscall interface along with the
1632 new (ARM EABI) one. It also provides a compatibility layer to
1633 intercept syscalls that have structure arguments which layout
1634 in memory differs between the legacy ABI and the new ARM EABI
1635 (only for non "thumb" binaries). This option adds a tiny
1636 overhead to all syscalls and produces a slightly larger kernel.
1638 The seccomp filter system will not be available when this is
1639 selected, since there is no way yet to sensibly distinguish
1640 between calling conventions during filtering.
1642 If you know you'll be using only pure EABI user space then you
1643 can say N here. If this option is not selected and you attempt
1644 to execute a legacy ABI binary then the result will be
1645 UNPREDICTABLE (in fact it can be predicted that it won't work
1646 at all). If in doubt say N.
1648 config ARCH_HAS_HOLES_MEMORYMODEL
1651 config ARCH_SPARSEMEM_ENABLE
1654 config ARCH_SPARSEMEM_DEFAULT
1655 def_bool ARCH_SPARSEMEM_ENABLE
1657 config ARCH_SELECT_MEMORY_MODEL
1658 def_bool ARCH_SPARSEMEM_ENABLE
1660 config HAVE_ARCH_PFN_VALID
1661 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1664 bool "High Memory Support"
1667 The address space of ARM processors is only 4 Gigabytes large
1668 and it has to accommodate user address space, kernel address
1669 space as well as some memory mapped IO. That means that, if you
1670 have a large amount of physical memory and/or IO, not all of the
1671 memory can be "permanently mapped" by the kernel. The physical
1672 memory that is not permanently mapped is called "high memory".
1674 Depending on the selected kernel/user memory split, minimum
1675 vmalloc space and actual amount of RAM, you may not need this
1676 option which should result in a slightly faster kernel.
1681 bool "Allocate 2nd-level pagetables from highmem"
1684 config HW_PERF_EVENTS
1685 bool "Enable hardware performance counter support for perf events"
1686 depends on PERF_EVENTS
1689 Enable hardware performance counter support for perf events. If
1690 disabled, perf events will use software events only.
1692 config SYS_SUPPORTS_HUGETLBFS
1696 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1700 config ARCH_WANT_GENERAL_HUGETLB
1705 config FORCE_MAX_ZONEORDER
1706 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1707 range 11 64 if ARCH_SHMOBILE_LEGACY
1708 default "12" if SOC_AM33XX
1709 default "9" if SA1111 || ARCH_EFM32
1712 The kernel memory allocator divides physically contiguous memory
1713 blocks into "zones", where each zone is a power of two number of
1714 pages. This option selects the largest power of two that the kernel
1715 keeps in the memory allocator. If you need to allocate very large
1716 blocks of physically contiguous memory, then you may need to
1717 increase this value.
1719 This config option is actually maximum order plus one. For example,
1720 a value of 11 means that the largest free memory block is 2^10 pages.
1722 config ALIGNMENT_TRAP
1724 depends on CPU_CP15_MMU
1725 default y if !ARCH_EBSA110
1726 select HAVE_PROC_CPU if PROC_FS
1728 ARM processors cannot fetch/store information which is not
1729 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1730 address divisible by 4. On 32-bit ARM processors, these non-aligned
1731 fetch/store instructions will be emulated in software if you say
1732 here, which has a severe performance impact. This is necessary for
1733 correct operation of some network protocols. With an IP-only
1734 configuration it is safe to say N, otherwise say Y.
1736 config UACCESS_WITH_MEMCPY
1737 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1739 default y if CPU_FEROCEON
1741 Implement faster copy_to_user and clear_user methods for CPU
1742 cores where a 8-word STM instruction give significantly higher
1743 memory write throughput than a sequence of individual 32bit stores.
1745 A possible side effect is a slight increase in scheduling latency
1746 between threads sharing the same address space if they invoke
1747 such copy operations with large buffers.
1749 However, if the CPU data cache is using a write-allocate mode,
1750 this option is unlikely to provide any performance gain.
1754 prompt "Enable seccomp to safely compute untrusted bytecode"
1756 This kernel feature is useful for number crunching applications
1757 that may need to compute untrusted bytecode during their
1758 execution. By using pipes or other transports made available to
1759 the process as file descriptors supporting the read/write
1760 syscalls, it's possible to isolate those applications in
1761 their own address space using seccomp. Once seccomp is
1762 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1763 and the task is only allowed to execute a few safe syscalls
1764 defined by each seccomp mode.
1777 bool "Xen guest support on ARM (EXPERIMENTAL)"
1778 depends on ARM && AEABI && OF
1779 depends on CPU_V7 && !CPU_V6
1780 depends on !GENERIC_ATOMIC64
1782 select ARCH_DMA_ADDR_T_64BIT
1786 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1793 bool "Flattened Device Tree support"
1796 select OF_EARLY_FLATTREE
1797 select OF_RESERVED_MEM
1799 Include support for flattened device tree machine descriptions.
1802 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1805 This is the traditional way of passing data to the kernel at boot
1806 time. If you are solely relying on the flattened device tree (or
1807 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1808 to remove ATAGS support from your kernel binary. If unsure,
1811 config DEPRECATED_PARAM_STRUCT
1812 bool "Provide old way to pass kernel parameters"
1815 This was deprecated in 2001 and announced to live on for 5 years.
1816 Some old boot loaders still use this way.
1818 # Compressed boot loader in ROM. Yes, we really want to ask about
1819 # TEXT and BSS so we preserve their values in the config files.
1820 config ZBOOT_ROM_TEXT
1821 hex "Compressed ROM boot loader base address"
1824 The physical address at which the ROM-able zImage is to be
1825 placed in the target. Platforms which normally make use of
1826 ROM-able zImage formats normally set this to a suitable
1827 value in their defconfig file.
1829 If ZBOOT_ROM is not enabled, this has no effect.
1831 config ZBOOT_ROM_BSS
1832 hex "Compressed ROM boot loader BSS address"
1835 The base address of an area of read/write memory in the target
1836 for the ROM-able zImage which must be available while the
1837 decompressor is running. It must be large enough to hold the
1838 entire decompressed kernel plus an additional 128 KiB.
1839 Platforms which normally make use of ROM-able zImage formats
1840 normally set this to a suitable value in their defconfig file.
1842 If ZBOOT_ROM is not enabled, this has no effect.
1845 bool "Compressed boot loader in ROM/flash"
1846 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1847 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1849 Say Y here if you intend to execute your compressed kernel image
1850 (zImage) directly from ROM or flash. If unsure, say N.
1853 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1854 depends on ZBOOT_ROM && ARCH_SH7372
1855 default ZBOOT_ROM_NONE
1857 Include experimental SD/MMC loading code in the ROM-able zImage.
1858 With this enabled it is possible to write the ROM-able zImage
1859 kernel image to an MMC or SD card and boot the kernel straight
1860 from the reset vector. At reset the processor Mask ROM will load
1861 the first part of the ROM-able zImage which in turn loads the
1862 rest the kernel image to RAM.
1864 config ZBOOT_ROM_NONE
1865 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1867 Do not load image from SD or MMC
1869 config ZBOOT_ROM_MMCIF
1870 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1872 Load image from MMCIF hardware block.
1874 config ZBOOT_ROM_SH_MOBILE_SDHI
1875 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1877 Load image from SDHI hardware block
1881 config ARM_APPENDED_DTB
1882 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1885 With this option, the boot code will look for a device tree binary
1886 (DTB) appended to zImage
1887 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1889 This is meant as a backward compatibility convenience for those
1890 systems with a bootloader that can't be upgraded to accommodate
1891 the documented boot protocol using a device tree.
1893 Beware that there is very little in terms of protection against
1894 this option being confused by leftover garbage in memory that might
1895 look like a DTB header after a reboot if no actual DTB is appended
1896 to zImage. Do not leave this option active in a production kernel
1897 if you don't intend to always append a DTB. Proper passing of the
1898 location into r2 of a bootloader provided DTB is always preferable
1901 config ARM_ATAG_DTB_COMPAT
1902 bool "Supplement the appended DTB with traditional ATAG information"
1903 depends on ARM_APPENDED_DTB
1905 Some old bootloaders can't be updated to a DTB capable one, yet
1906 they provide ATAGs with memory configuration, the ramdisk address,
1907 the kernel cmdline string, etc. Such information is dynamically
1908 provided by the bootloader and can't always be stored in a static
1909 DTB. To allow a device tree enabled kernel to be used with such
1910 bootloaders, this option allows zImage to extract the information
1911 from the ATAG list and store it at run time into the appended DTB.
1914 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1915 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1917 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1918 bool "Use bootloader kernel arguments if available"
1920 Uses the command-line options passed by the boot loader instead of
1921 the device tree bootargs property. If the boot loader doesn't provide
1922 any, the device tree bootargs property will be used.
1924 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1925 bool "Extend with bootloader kernel arguments"
1927 The command-line arguments provided by the boot loader will be
1928 appended to the the device tree bootargs property.
1933 string "Default kernel command string"
1936 On some architectures (EBSA110 and CATS), there is currently no way
1937 for the boot loader to pass arguments to the kernel. For these
1938 architectures, you should supply some command-line options at build
1939 time by entering them here. As a minimum, you should specify the
1940 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1943 prompt "Kernel command line type" if CMDLINE != ""
1944 default CMDLINE_FROM_BOOTLOADER
1947 config CMDLINE_FROM_BOOTLOADER
1948 bool "Use bootloader kernel arguments if available"
1950 Uses the command-line options passed by the boot loader. If
1951 the boot loader doesn't provide any, the default kernel command
1952 string provided in CMDLINE will be used.
1954 config CMDLINE_EXTEND
1955 bool "Extend bootloader kernel arguments"
1957 The command-line arguments provided by the boot loader will be
1958 appended to the default kernel command string.
1960 config CMDLINE_FORCE
1961 bool "Always use the default kernel command string"
1963 Always use the default kernel command string, even if the boot
1964 loader passes other arguments to the kernel.
1965 This is useful if you cannot or don't want to change the
1966 command-line options your boot loader passes to the kernel.
1970 bool "Kernel Execute-In-Place from ROM"
1971 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1973 Execute-In-Place allows the kernel to run from non-volatile storage
1974 directly addressable by the CPU, such as NOR flash. This saves RAM
1975 space since the text section of the kernel is not loaded from flash
1976 to RAM. Read-write sections, such as the data section and stack,
1977 are still copied to RAM. The XIP kernel is not compressed since
1978 it has to run directly from flash, so it will take more space to
1979 store it. The flash address used to link the kernel object files,
1980 and for storing it, is configuration dependent. Therefore, if you
1981 say Y here, you must know the proper physical address where to
1982 store the kernel image depending on your own flash memory usage.
1984 Also note that the make target becomes "make xipImage" rather than
1985 "make zImage" or "make Image". The final kernel binary to put in
1986 ROM memory will be arch/arm/boot/xipImage.
1990 config XIP_PHYS_ADDR
1991 hex "XIP Kernel Physical Location"
1992 depends on XIP_KERNEL
1993 default "0x00080000"
1995 This is the physical address in your flash memory the kernel will
1996 be linked for and stored to. This address is dependent on your
2000 bool "Kexec system call (EXPERIMENTAL)"
2001 depends on (!SMP || PM_SLEEP_SMP)
2003 kexec is a system call that implements the ability to shutdown your
2004 current kernel, and to start another kernel. It is like a reboot
2005 but it is independent of the system firmware. And like a reboot
2006 you can start any kernel with it, not just Linux.
2008 It is an ongoing process to be certain the hardware in a machine
2009 is properly shutdown, so do not be surprised if this code does not
2010 initially work for you.
2013 bool "Export atags in procfs"
2014 depends on ATAGS && KEXEC
2017 Should the atags used to boot the kernel be exported in an "atags"
2018 file in procfs. Useful with kexec.
2021 bool "Build kdump crash kernel (EXPERIMENTAL)"
2023 Generate crash dump after being started by kexec. This should
2024 be normally only set in special crash dump kernels which are
2025 loaded in the main kernel with kexec-tools into a specially
2026 reserved region and then later executed after a crash by
2027 kdump/kexec. The crash dump kernel must be compiled to a
2028 memory address not used by the main kernel
2030 For more details see Documentation/kdump/kdump.txt
2032 config AUTO_ZRELADDR
2033 bool "Auto calculation of the decompressed kernel image address"
2035 ZRELADDR is the physical address where the decompressed kernel
2036 image will be placed. If AUTO_ZRELADDR is selected, the address
2037 will be determined at run-time by masking the current IP with
2038 0xf8000000. This assumes the zImage being placed in the first 128MB
2039 from start of memory.
2043 menu "CPU Power Management"
2045 source "drivers/cpufreq/Kconfig"
2047 source "drivers/cpuidle/Kconfig"
2051 menu "Floating point emulation"
2053 comment "At least one emulation must be selected"
2056 bool "NWFPE math emulation"
2057 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2059 Say Y to include the NWFPE floating point emulator in the kernel.
2060 This is necessary to run most binaries. Linux does not currently
2061 support floating point hardware so you need to say Y here even if
2062 your machine has an FPA or floating point co-processor podule.
2064 You may say N here if you are going to load the Acorn FPEmulator
2065 early in the bootup.
2068 bool "Support extended precision"
2069 depends on FPE_NWFPE
2071 Say Y to include 80-bit support in the kernel floating-point
2072 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2073 Note that gcc does not generate 80-bit operations by default,
2074 so in most cases this option only enlarges the size of the
2075 floating point emulator without any good reason.
2077 You almost surely want to say N here.
2080 bool "FastFPE math emulation (EXPERIMENTAL)"
2081 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2083 Say Y here to include the FAST floating point emulator in the kernel.
2084 This is an experimental much faster emulator which now also has full
2085 precision for the mantissa. It does not support any exceptions.
2086 It is very simple, and approximately 3-6 times faster than NWFPE.
2088 It should be sufficient for most programs. It may be not suitable
2089 for scientific calculations, but you have to check this for yourself.
2090 If you do not feel you need a faster FP emulation you should better
2094 bool "VFP-format floating point maths"
2095 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2097 Say Y to include VFP support code in the kernel. This is needed
2098 if your hardware includes a VFP unit.
2100 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2101 release notes and additional status information.
2103 Say N if your target does not have VFP hardware.
2111 bool "Advanced SIMD (NEON) Extension support"
2112 depends on VFPv3 && CPU_V7
2114 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2117 config KERNEL_MODE_NEON
2118 bool "Support for NEON in kernel mode"
2119 depends on NEON && AEABI
2121 Say Y to include support for NEON in kernel mode.
2125 menu "Userspace binary formats"
2127 source "fs/Kconfig.binfmt"
2130 tristate "RISC OS personality"
2133 Say Y here to include the kernel code necessary if you want to run
2134 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2135 experimental; if this sounds frightening, say N and sleep in peace.
2136 You can also say M here to compile this support as a module (which
2137 will be called arthur).
2141 menu "Power management options"
2143 source "kernel/power/Kconfig"
2145 config ARCH_SUSPEND_POSSIBLE
2146 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2147 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2150 config ARM_CPU_SUSPEND
2153 config ARCH_HIBERNATION_POSSIBLE
2156 default y if ARCH_SUSPEND_POSSIBLE
2160 source "net/Kconfig"
2162 source "drivers/Kconfig"
2166 source "arch/arm/Kconfig.debug"
2168 source "security/Kconfig"
2170 source "crypto/Kconfig"
2172 source "lib/Kconfig"
2174 source "arch/arm/kvm/Kconfig"