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_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
18 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
19 select GENERIC_IDLE_POLL_SETUP
20 select GENERIC_IRQ_PROBE
21 select GENERIC_IRQ_SHOW
22 select GENERIC_PCI_IOMAP
23 select GENERIC_SCHED_CLOCK
24 select GENERIC_SMP_IDLE_THREAD
25 select GENERIC_STRNCPY_FROM_USER
26 select GENERIC_STRNLEN_USER
27 select HARDIRQS_SW_RESEND
28 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
29 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
31 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
32 select HAVE_ARCH_TRACEHOOK
34 select HAVE_CC_STACKPROTECTOR
35 select HAVE_CONTEXT_TRACKING
36 select HAVE_C_RECORDMCOUNT
37 select HAVE_DEBUG_KMEMLEAK
38 select HAVE_DMA_API_DEBUG
40 select HAVE_DMA_CONTIGUOUS if MMU
41 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
42 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
43 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
44 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
45 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
46 select HAVE_GENERIC_DMA_COHERENT
47 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
48 select HAVE_IDE if PCI || ISA || PCMCIA
49 select HAVE_IRQ_TIME_ACCOUNTING
50 select HAVE_KERNEL_GZIP
51 select HAVE_KERNEL_LZ4
52 select HAVE_KERNEL_LZMA
53 select HAVE_KERNEL_LZO
55 select HAVE_KPROBES if !XIP_KERNEL
56 select HAVE_KRETPROBES if (HAVE_KPROBES)
58 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
59 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
60 select HAVE_PERF_EVENTS
62 select HAVE_PERF_USER_STACK_DUMP
63 select HAVE_REGS_AND_STACK_ACCESS_API
64 select HAVE_SYSCALL_TRACEPOINTS
66 select HAVE_VIRT_CPU_ACCOUNTING_GEN
67 select IRQ_FORCED_THREADING
69 select MODULES_USE_ELF_REL
72 select OLD_SIGSUSPEND3
73 select PERF_USE_VMALLOC
75 select SYS_SUPPORTS_APM_EMULATION
76 # Above selects are sorted alphabetically; please add new ones
77 # according to that. Thanks.
79 The ARM series is a line of low-power-consumption RISC chip designs
80 licensed by ARM Ltd and targeted at embedded applications and
81 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
82 manufactured, but legacy ARM-based PC hardware remains popular in
83 Europe. There is an ARM Linux project with a web page at
84 <http://www.arm.linux.org.uk/>.
86 config ARM_HAS_SG_CHAIN
89 config NEED_SG_DMA_LENGTH
92 config ARM_DMA_USE_IOMMU
94 select ARM_HAS_SG_CHAIN
95 select NEED_SG_DMA_LENGTH
99 config ARM_DMA_IOMMU_ALIGNMENT
100 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
104 DMA mapping framework by default aligns all buffers to the smallest
105 PAGE_SIZE order which is greater than or equal to the requested buffer
106 size. This works well for buffers up to a few hundreds kilobytes, but
107 for larger buffers it just a waste of address space. Drivers which has
108 relatively small addressing window (like 64Mib) might run out of
109 virtual space with just a few allocations.
111 With this parameter you can specify the maximum PAGE_SIZE order for
112 DMA IOMMU buffers. Larger buffers will be aligned only to this
113 specified order. The order is expressed as a power of two multiplied
118 config MIGHT_HAVE_PCI
121 config SYS_SUPPORTS_APM_EMULATION
126 select GENERIC_ALLOCATOR
137 The Extended Industry Standard Architecture (EISA) bus was
138 developed as an open alternative to the IBM MicroChannel bus.
140 The EISA bus provided some of the features of the IBM MicroChannel
141 bus while maintaining backward compatibility with cards made for
142 the older ISA bus. The EISA bus saw limited use between 1988 and
143 1995 when it was made obsolete by the PCI bus.
145 Say Y here if you are building a kernel for an EISA-based machine.
152 config STACKTRACE_SUPPORT
156 config HAVE_LATENCYTOP_SUPPORT
161 config LOCKDEP_SUPPORT
165 config TRACE_IRQFLAGS_SUPPORT
169 config RWSEM_XCHGADD_ALGORITHM
173 config ARCH_HAS_ILOG2_U32
176 config ARCH_HAS_ILOG2_U64
179 config ARCH_HAS_BANDGAP
182 config GENERIC_HWEIGHT
186 config GENERIC_CALIBRATE_DELAY
190 config ARCH_MAY_HAVE_PC_FDC
196 config NEED_DMA_MAP_STATE
199 config ARCH_SUPPORTS_UPROBES
202 config ARCH_HAS_DMA_SET_COHERENT_MASK
205 config GENERIC_ISA_DMA
211 config NEED_RET_TO_USER
219 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
220 default DRAM_BASE if REMAP_VECTORS_TO_RAM
223 The base address of exception vectors. This must be two pages
226 config ARM_PATCH_PHYS_VIRT
227 bool "Patch physical to virtual translations at runtime" if EMBEDDED
229 depends on !XIP_KERNEL && MMU
230 depends on !ARCH_REALVIEW || !SPARSEMEM
232 Patch phys-to-virt and virt-to-phys translation functions at
233 boot and module load time according to the position of the
234 kernel in system memory.
236 This can only be used with non-XIP MMU kernels where the base
237 of physical memory is at a 16MB boundary.
239 Only disable this option if you know that you do not require
240 this feature (eg, building a kernel for a single machine) and
241 you need to shrink the kernel to the minimal size.
243 config NEED_MACH_GPIO_H
246 Select this when mach/gpio.h is required to provide special
247 definitions for this platform. The need for mach/gpio.h should
248 be avoided when possible.
250 config NEED_MACH_IO_H
253 Select this when mach/io.h is required to provide special
254 definitions for this platform. The need for mach/io.h should
255 be avoided when possible.
257 config NEED_MACH_MEMORY_H
260 Select this when mach/memory.h is required to provide special
261 definitions for this platform. The need for mach/memory.h should
262 be avoided when possible.
265 hex "Physical address of main memory" if MMU
266 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
267 default DRAM_BASE if !MMU
269 Please provide the physical address corresponding to the
270 location of main memory in your system.
276 source "init/Kconfig"
278 source "kernel/Kconfig.freezer"
283 bool "MMU-based Paged Memory Management Support"
286 Select if you want MMU-based virtualised addressing space
287 support by paged memory management. If unsure, say 'Y'.
290 # The "ARM system type" choice list is ordered alphabetically by option
291 # text. Please add new entries in the option alphabetic order.
294 prompt "ARM system type"
295 default ARCH_VERSATILE if !MMU
296 default ARCH_MULTIPLATFORM if MMU
298 config ARCH_MULTIPLATFORM
299 bool "Allow multiple platforms to be selected"
301 select ARCH_WANT_OPTIONAL_GPIOLIB
302 select ARM_HAS_SG_CHAIN
303 select ARM_PATCH_PHYS_VIRT
307 select GENERIC_CLOCKEVENTS
308 select MIGHT_HAVE_PCI
309 select MULTI_IRQ_HANDLER
313 config ARCH_INTEGRATOR
314 bool "ARM Ltd. Integrator family"
316 select ARM_PATCH_PHYS_VIRT
319 select COMMON_CLK_VERSATILE
320 select GENERIC_CLOCKEVENTS
323 select MULTI_IRQ_HANDLER
324 select NEED_MACH_MEMORY_H
325 select PLAT_VERSATILE
328 select VERSATILE_FPGA_IRQ
330 Support for ARM's Integrator platform.
333 bool "ARM Ltd. RealView family"
334 select ARCH_WANT_OPTIONAL_GPIOLIB
336 select ARM_TIMER_SP804
338 select COMMON_CLK_VERSATILE
339 select GENERIC_CLOCKEVENTS
340 select GPIO_PL061 if GPIOLIB
342 select NEED_MACH_MEMORY_H
343 select PLAT_VERSATILE
344 select PLAT_VERSATILE_CLCD
346 This enables support for ARM Ltd RealView boards.
348 config ARCH_VERSATILE
349 bool "ARM Ltd. Versatile family"
350 select ARCH_WANT_OPTIONAL_GPIOLIB
352 select ARM_TIMER_SP804
355 select GENERIC_CLOCKEVENTS
356 select HAVE_MACH_CLKDEV
358 select PLAT_VERSATILE
359 select PLAT_VERSATILE_CLCD
360 select PLAT_VERSATILE_CLOCK
361 select VERSATILE_FPGA_IRQ
363 This enables support for ARM Ltd Versatile board.
367 select ARCH_REQUIRE_GPIOLIB
370 select NEED_MACH_IO_H if PCCARD
372 select PINCTRL_AT91 if USE_OF
374 This enables support for systems based on Atmel
375 AT91RM9200 and AT91SAM9* processors.
378 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
379 select ARCH_REQUIRE_GPIOLIB
384 select GENERIC_CLOCKEVENTS
387 Support for Cirrus Logic 711x/721x/731x based boards.
390 bool "Cortina Systems Gemini"
391 select ARCH_REQUIRE_GPIOLIB
394 select GENERIC_CLOCKEVENTS
396 Support for the Cortina Systems Gemini family SoCs
400 select ARCH_USES_GETTIMEOFFSET
403 select NEED_MACH_IO_H
404 select NEED_MACH_MEMORY_H
407 This is an evaluation board for the StrongARM processor available
408 from Digital. It has limited hardware on-board, including an
409 Ethernet interface, two PCMCIA sockets, two serial ports and a
413 bool "Energy Micro efm32"
415 select ARCH_REQUIRE_GPIOLIB
421 select GENERIC_CLOCKEVENTS
427 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
432 select ARCH_HAS_HOLES_MEMORYMODEL
433 select ARCH_REQUIRE_GPIOLIB
434 select ARCH_USES_GETTIMEOFFSET
439 select NEED_MACH_MEMORY_H
441 This enables support for the Cirrus EP93xx series of CPUs.
443 config ARCH_FOOTBRIDGE
447 select GENERIC_CLOCKEVENTS
449 select NEED_MACH_IO_H if !MMU
450 select NEED_MACH_MEMORY_H
452 Support for systems based on the DC21285 companion chip
453 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
456 bool "Hilscher NetX based"
460 select GENERIC_CLOCKEVENTS
462 This enables support for systems based on the Hilscher NetX Soc
468 select NEED_MACH_MEMORY_H
469 select NEED_RET_TO_USER
475 Support for Intel's IOP13XX (XScale) family of processors.
480 select ARCH_REQUIRE_GPIOLIB
483 select NEED_RET_TO_USER
487 Support for Intel's 80219 and IOP32X (XScale) family of
493 select ARCH_REQUIRE_GPIOLIB
496 select NEED_RET_TO_USER
500 Support for Intel's IOP33X (XScale) family of processors.
505 select ARCH_HAS_DMA_SET_COHERENT_MASK
506 select ARCH_REQUIRE_GPIOLIB
507 select ARCH_SUPPORTS_BIG_ENDIAN
510 select DMABOUNCE if PCI
511 select GENERIC_CLOCKEVENTS
512 select MIGHT_HAVE_PCI
513 select NEED_MACH_IO_H
514 select USB_EHCI_BIG_ENDIAN_DESC
515 select USB_EHCI_BIG_ENDIAN_MMIO
517 Support for Intel's IXP4XX (XScale) family of processors.
521 select ARCH_REQUIRE_GPIOLIB
523 select GENERIC_CLOCKEVENTS
524 select MIGHT_HAVE_PCI
528 select PLAT_ORION_LEGACY
530 Support for the Marvell Dove SoC 88AP510
533 bool "Marvell Kirkwood"
534 select ARCH_REQUIRE_GPIOLIB
536 select GENERIC_CLOCKEVENTS
541 select PINCTRL_KIRKWOOD
542 select PLAT_ORION_LEGACY
544 Support for the following Marvell Kirkwood series SoCs:
545 88F6180, 88F6192 and 88F6281.
548 bool "Marvell MV78xx0"
549 select ARCH_REQUIRE_GPIOLIB
551 select GENERIC_CLOCKEVENTS
554 select PLAT_ORION_LEGACY
556 Support for the following Marvell MV78xx0 series SoCs:
562 select ARCH_REQUIRE_GPIOLIB
564 select GENERIC_CLOCKEVENTS
567 select PLAT_ORION_LEGACY
569 Support for the following Marvell Orion 5x series SoCs:
570 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
571 Orion-2 (5281), Orion-1-90 (6183).
574 bool "Marvell PXA168/910/MMP2"
576 select ARCH_REQUIRE_GPIOLIB
578 select GENERIC_ALLOCATOR
579 select GENERIC_CLOCKEVENTS
582 select MULTI_IRQ_HANDLER
587 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
590 bool "Micrel/Kendin KS8695"
591 select ARCH_REQUIRE_GPIOLIB
594 select GENERIC_CLOCKEVENTS
595 select NEED_MACH_MEMORY_H
597 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
598 System-on-Chip devices.
601 bool "Nuvoton W90X900 CPU"
602 select ARCH_REQUIRE_GPIOLIB
606 select GENERIC_CLOCKEVENTS
608 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
609 At present, the w90x900 has been renamed nuc900, regarding
610 the ARM series product line, you can login the following
611 link address to know more.
613 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
614 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
618 select ARCH_REQUIRE_GPIOLIB
623 select GENERIC_CLOCKEVENTS
627 Support for the NXP LPC32XX family of processors
630 bool "PXA2xx/PXA3xx-based"
633 select ARCH_REQUIRE_GPIOLIB
634 select ARM_CPU_SUSPEND if PM
638 select GENERIC_CLOCKEVENTS
641 select MULTI_IRQ_HANDLER
645 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
648 bool "Qualcomm MSM (non-multiplatform)"
649 select ARCH_REQUIRE_GPIOLIB
651 select GENERIC_CLOCKEVENTS
653 Support for Qualcomm MSM/QSD based systems. This runs on the
654 apps processor of the MSM/QSD and depends on a shared memory
655 interface to the modem processor which runs the baseband
656 stack and controls some vital subsystems
657 (clock and power control, etc).
659 config ARCH_SHMOBILE_LEGACY
660 bool "Renesas ARM SoCs (non-multiplatform)"
662 select ARM_PATCH_PHYS_VIRT
664 select GENERIC_CLOCKEVENTS
665 select HAVE_ARM_SCU if SMP
666 select HAVE_ARM_TWD if SMP
667 select HAVE_MACH_CLKDEV
669 select MIGHT_HAVE_CACHE_L2X0
670 select MULTI_IRQ_HANDLER
673 select PM_GENERIC_DOMAINS if PM
676 Support for Renesas ARM SoC platforms using a non-multiplatform
677 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
683 select ARCH_MAY_HAVE_PC_FDC
684 select ARCH_SPARSEMEM_ENABLE
685 select ARCH_USES_GETTIMEOFFSET
689 select HAVE_PATA_PLATFORM
691 select NEED_MACH_IO_H
692 select NEED_MACH_MEMORY_H
696 On the Acorn Risc-PC, Linux can support the internal IDE disk and
697 CD-ROM interface, serial and parallel port, and the floppy drive.
702 select ARCH_REQUIRE_GPIOLIB
703 select ARCH_SPARSEMEM_ENABLE
708 select GENERIC_CLOCKEVENTS
711 select NEED_MACH_MEMORY_H
714 Support for StrongARM 11x0 based boards.
717 bool "Samsung S3C24XX SoCs"
718 select ARCH_REQUIRE_GPIOLIB
721 select CLKSRC_SAMSUNG_PWM
722 select GENERIC_CLOCKEVENTS
724 select HAVE_S3C2410_I2C if I2C
725 select HAVE_S3C2410_WATCHDOG if WATCHDOG
726 select HAVE_S3C_RTC if RTC_CLASS
727 select MULTI_IRQ_HANDLER
728 select NEED_MACH_IO_H
731 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
732 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
733 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
734 Samsung SMDK2410 development board (and derivatives).
737 bool "Samsung S3C64XX"
738 select ARCH_REQUIRE_GPIOLIB
743 select CLKSRC_SAMSUNG_PWM
744 select COMMON_CLK_SAMSUNG
746 select GENERIC_CLOCKEVENTS
748 select HAVE_S3C2410_I2C if I2C
749 select HAVE_S3C2410_WATCHDOG if WATCHDOG
753 select PM_GENERIC_DOMAINS if PM
755 select S3C_GPIO_TRACK
757 select SAMSUNG_WAKEMASK
758 select SAMSUNG_WDT_RESET
760 Samsung S3C64XX series based systems
763 bool "Samsung S5P6440 S5P6450"
766 select CLKSRC_SAMSUNG_PWM
768 select GENERIC_CLOCKEVENTS
770 select HAVE_S3C2410_I2C if I2C
771 select HAVE_S3C2410_WATCHDOG if WATCHDOG
772 select HAVE_S3C_RTC if RTC_CLASS
773 select NEED_MACH_GPIO_H
775 select SAMSUNG_WDT_RESET
777 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
781 bool "Samsung S5PC100"
782 select ARCH_REQUIRE_GPIOLIB
785 select CLKSRC_SAMSUNG_PWM
787 select GENERIC_CLOCKEVENTS
789 select HAVE_S3C2410_I2C if I2C
790 select HAVE_S3C2410_WATCHDOG if WATCHDOG
791 select HAVE_S3C_RTC if RTC_CLASS
792 select NEED_MACH_GPIO_H
794 select SAMSUNG_WDT_RESET
796 Samsung S5PC100 series based systems
799 bool "Samsung S5PV210/S5PC110"
800 select ARCH_HAS_HOLES_MEMORYMODEL
801 select ARCH_SPARSEMEM_ENABLE
804 select CLKSRC_SAMSUNG_PWM
806 select GENERIC_CLOCKEVENTS
808 select HAVE_S3C2410_I2C if I2C
809 select HAVE_S3C2410_WATCHDOG if WATCHDOG
810 select HAVE_S3C_RTC if RTC_CLASS
811 select NEED_MACH_GPIO_H
812 select NEED_MACH_MEMORY_H
815 Samsung S5PV210/S5PC110 series based systems
819 select ARCH_HAS_HOLES_MEMORYMODEL
820 select ARCH_REQUIRE_GPIOLIB
822 select GENERIC_ALLOCATOR
823 select GENERIC_CLOCKEVENTS
824 select GENERIC_IRQ_CHIP
830 Support for TI's DaVinci platform.
835 select ARCH_HAS_HOLES_MEMORYMODEL
837 select ARCH_REQUIRE_GPIOLIB
840 select GENERIC_CLOCKEVENTS
841 select GENERIC_IRQ_CHIP
844 select NEED_MACH_IO_H if PCCARD
845 select NEED_MACH_MEMORY_H
847 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
851 menu "Multiple platform selection"
852 depends on ARCH_MULTIPLATFORM
854 comment "CPU Core family selection"
857 bool "ARMv4 based platforms (FA526)"
858 depends on !ARCH_MULTI_V6_V7
859 select ARCH_MULTI_V4_V5
862 config ARCH_MULTI_V4T
863 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
864 depends on !ARCH_MULTI_V6_V7
865 select ARCH_MULTI_V4_V5
866 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
867 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
868 CPU_ARM925T || CPU_ARM940T)
871 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
872 depends on !ARCH_MULTI_V6_V7
873 select ARCH_MULTI_V4_V5
874 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
875 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
876 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
878 config ARCH_MULTI_V4_V5
882 bool "ARMv6 based platforms (ARM11)"
883 select ARCH_MULTI_V6_V7
887 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
889 select ARCH_MULTI_V6_V7
893 config ARCH_MULTI_V6_V7
895 select MIGHT_HAVE_CACHE_L2X0
897 config ARCH_MULTI_CPU_AUTO
898 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
904 bool "Dummy Virtual Machine" if ARCH_MULTI_V7
908 select HAVE_ARM_ARCH_TIMER
911 # This is sorted alphabetically by mach-* pathname. However, plat-*
912 # Kconfigs may be included either alphabetically (according to the
913 # plat- suffix) or along side the corresponding mach-* source.
915 source "arch/arm/mach-mvebu/Kconfig"
917 source "arch/arm/mach-at91/Kconfig"
919 source "arch/arm/mach-axxia/Kconfig"
921 source "arch/arm/mach-bcm/Kconfig"
923 source "arch/arm/mach-berlin/Kconfig"
925 source "arch/arm/mach-clps711x/Kconfig"
927 source "arch/arm/mach-cns3xxx/Kconfig"
929 source "arch/arm/mach-davinci/Kconfig"
931 source "arch/arm/mach-dove/Kconfig"
933 source "arch/arm/mach-ep93xx/Kconfig"
935 source "arch/arm/mach-footbridge/Kconfig"
937 source "arch/arm/mach-gemini/Kconfig"
939 source "arch/arm/mach-highbank/Kconfig"
941 source "arch/arm/mach-hisi/Kconfig"
943 source "arch/arm/mach-integrator/Kconfig"
945 source "arch/arm/mach-iop32x/Kconfig"
947 source "arch/arm/mach-iop33x/Kconfig"
949 source "arch/arm/mach-iop13xx/Kconfig"
951 source "arch/arm/mach-ixp4xx/Kconfig"
953 source "arch/arm/mach-keystone/Kconfig"
955 source "arch/arm/mach-kirkwood/Kconfig"
957 source "arch/arm/mach-ks8695/Kconfig"
959 source "arch/arm/mach-msm/Kconfig"
961 source "arch/arm/mach-moxart/Kconfig"
963 source "arch/arm/mach-mv78xx0/Kconfig"
965 source "arch/arm/mach-imx/Kconfig"
967 source "arch/arm/mach-mxs/Kconfig"
969 source "arch/arm/mach-netx/Kconfig"
971 source "arch/arm/mach-nomadik/Kconfig"
973 source "arch/arm/mach-nspire/Kconfig"
975 source "arch/arm/plat-omap/Kconfig"
977 source "arch/arm/mach-omap1/Kconfig"
979 source "arch/arm/mach-omap2/Kconfig"
981 source "arch/arm/mach-orion5x/Kconfig"
983 source "arch/arm/mach-picoxcell/Kconfig"
985 source "arch/arm/mach-pxa/Kconfig"
986 source "arch/arm/plat-pxa/Kconfig"
988 source "arch/arm/mach-mmp/Kconfig"
990 source "arch/arm/mach-qcom/Kconfig"
992 source "arch/arm/mach-realview/Kconfig"
994 source "arch/arm/mach-rockchip/Kconfig"
996 source "arch/arm/mach-sa1100/Kconfig"
998 source "arch/arm/mach-socfpga/Kconfig"
1000 source "arch/arm/mach-spear/Kconfig"
1002 source "arch/arm/mach-sti/Kconfig"
1004 source "arch/arm/mach-s3c24xx/Kconfig"
1006 source "arch/arm/mach-s3c64xx/Kconfig"
1008 source "arch/arm/mach-s5p64x0/Kconfig"
1010 source "arch/arm/mach-s5pc100/Kconfig"
1012 source "arch/arm/mach-s5pv210/Kconfig"
1014 source "arch/arm/mach-exynos/Kconfig"
1015 source "arch/arm/plat-samsung/Kconfig"
1017 source "arch/arm/mach-shmobile/Kconfig"
1019 source "arch/arm/mach-sunxi/Kconfig"
1021 source "arch/arm/mach-prima2/Kconfig"
1023 source "arch/arm/mach-tegra/Kconfig"
1025 source "arch/arm/mach-u300/Kconfig"
1027 source "arch/arm/mach-ux500/Kconfig"
1029 source "arch/arm/mach-versatile/Kconfig"
1031 source "arch/arm/mach-vexpress/Kconfig"
1032 source "arch/arm/plat-versatile/Kconfig"
1034 source "arch/arm/mach-vt8500/Kconfig"
1036 source "arch/arm/mach-w90x900/Kconfig"
1038 source "arch/arm/mach-zynq/Kconfig"
1040 # Definitions to make life easier
1046 select GENERIC_CLOCKEVENTS
1052 select GENERIC_IRQ_CHIP
1055 config PLAT_ORION_LEGACY
1062 config PLAT_VERSATILE
1065 config ARM_TIMER_SP804
1068 select CLKSRC_OF if OF
1070 source "arch/arm/firmware/Kconfig"
1072 source arch/arm/mm/Kconfig
1075 bool "Enable iWMMXt support"
1076 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
1077 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
1079 Enable support for iWMMXt context switching at run time if
1080 running on a CPU that supports it.
1082 config MULTI_IRQ_HANDLER
1085 Allow each machine to specify it's own IRQ handler at run time.
1088 source "arch/arm/Kconfig-nommu"
1091 config PJ4B_ERRATA_4742
1092 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1093 depends on CPU_PJ4B && MACH_ARMADA_370
1096 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1097 Event (WFE) IDLE states, a specific timing sensitivity exists between
1098 the retiring WFI/WFE instructions and the newly issued subsequent
1099 instructions. This sensitivity can result in a CPU hang scenario.
1101 The software must insert either a Data Synchronization Barrier (DSB)
1102 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1105 config ARM_ERRATA_326103
1106 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1109 Executing a SWP instruction to read-only memory does not set bit 11
1110 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1111 treat the access as a read, preventing a COW from occurring and
1112 causing the faulting task to livelock.
1114 config ARM_ERRATA_411920
1115 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1116 depends on CPU_V6 || CPU_V6K
1118 Invalidation of the Instruction Cache operation can
1119 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1120 It does not affect the MPCore. This option enables the ARM Ltd.
1121 recommended workaround.
1123 config ARM_ERRATA_430973
1124 bool "ARM errata: Stale prediction on replaced interworking branch"
1127 This option enables the workaround for the 430973 Cortex-A8
1128 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1129 interworking branch is replaced with another code sequence at the
1130 same virtual address, whether due to self-modifying code or virtual
1131 to physical address re-mapping, Cortex-A8 does not recover from the
1132 stale interworking branch prediction. This results in Cortex-A8
1133 executing the new code sequence in the incorrect ARM or Thumb state.
1134 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1135 and also flushes the branch target cache at every context switch.
1136 Note that setting specific bits in the ACTLR register may not be
1137 available in non-secure mode.
1139 config ARM_ERRATA_458693
1140 bool "ARM errata: Processor deadlock when a false hazard is created"
1142 depends on !ARCH_MULTIPLATFORM
1144 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1145 erratum. For very specific sequences of memory operations, it is
1146 possible for a hazard condition intended for a cache line to instead
1147 be incorrectly associated with a different cache line. This false
1148 hazard might then cause a processor deadlock. The workaround enables
1149 the L1 caching of the NEON accesses and disables the PLD instruction
1150 in the ACTLR register. Note that setting specific bits in the ACTLR
1151 register may not be available in non-secure mode.
1153 config ARM_ERRATA_460075
1154 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1156 depends on !ARCH_MULTIPLATFORM
1158 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1159 erratum. Any asynchronous access to the L2 cache may encounter a
1160 situation in which recent store transactions to the L2 cache are lost
1161 and overwritten with stale memory contents from external memory. The
1162 workaround disables the write-allocate mode for the L2 cache via the
1163 ACTLR register. Note that setting specific bits in the ACTLR register
1164 may not be available in non-secure mode.
1166 config ARM_ERRATA_742230
1167 bool "ARM errata: DMB operation may be faulty"
1168 depends on CPU_V7 && SMP
1169 depends on !ARCH_MULTIPLATFORM
1171 This option enables the workaround for the 742230 Cortex-A9
1172 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1173 between two write operations may not ensure the correct visibility
1174 ordering of the two writes. This workaround sets a specific bit in
1175 the diagnostic register of the Cortex-A9 which causes the DMB
1176 instruction to behave as a DSB, ensuring the correct behaviour of
1179 config ARM_ERRATA_742231
1180 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1181 depends on CPU_V7 && SMP
1182 depends on !ARCH_MULTIPLATFORM
1184 This option enables the workaround for the 742231 Cortex-A9
1185 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1186 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1187 accessing some data located in the same cache line, may get corrupted
1188 data due to bad handling of the address hazard when the line gets
1189 replaced from one of the CPUs at the same time as another CPU is
1190 accessing it. This workaround sets specific bits in the diagnostic
1191 register of the Cortex-A9 which reduces the linefill issuing
1192 capabilities of the processor.
1194 config ARM_ERRATA_643719
1195 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1196 depends on CPU_V7 && SMP
1198 This option enables the workaround for the 643719 Cortex-A9 (prior to
1199 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1200 register returns zero when it should return one. The workaround
1201 corrects this value, ensuring cache maintenance operations which use
1202 it behave as intended and avoiding data corruption.
1204 config ARM_ERRATA_720789
1205 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1208 This option enables the workaround for the 720789 Cortex-A9 (prior to
1209 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1210 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1211 As a consequence of this erratum, some TLB entries which should be
1212 invalidated are not, resulting in an incoherency in the system page
1213 tables. The workaround changes the TLB flushing routines to invalidate
1214 entries regardless of the ASID.
1216 config ARM_ERRATA_743622
1217 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1219 depends on !ARCH_MULTIPLATFORM
1221 This option enables the workaround for the 743622 Cortex-A9
1222 (r2p*) erratum. Under very rare conditions, a faulty
1223 optimisation in the Cortex-A9 Store Buffer may lead to data
1224 corruption. This workaround sets a specific bit in the diagnostic
1225 register of the Cortex-A9 which disables the Store Buffer
1226 optimisation, preventing the defect from occurring. This has no
1227 visible impact on the overall performance or power consumption of the
1230 config ARM_ERRATA_751472
1231 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1233 depends on !ARCH_MULTIPLATFORM
1235 This option enables the workaround for the 751472 Cortex-A9 (prior
1236 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1237 completion of a following broadcasted operation if the second
1238 operation is received by a CPU before the ICIALLUIS has completed,
1239 potentially leading to corrupted entries in the cache or TLB.
1241 config ARM_ERRATA_754322
1242 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1245 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1246 r3p*) erratum. A speculative memory access may cause a page table walk
1247 which starts prior to an ASID switch but completes afterwards. This
1248 can populate the micro-TLB with a stale entry which may be hit with
1249 the new ASID. This workaround places two dsb instructions in the mm
1250 switching code so that no page table walks can cross the ASID switch.
1252 config ARM_ERRATA_754327
1253 bool "ARM errata: no automatic Store Buffer drain"
1254 depends on CPU_V7 && SMP
1256 This option enables the workaround for the 754327 Cortex-A9 (prior to
1257 r2p0) erratum. The Store Buffer does not have any automatic draining
1258 mechanism and therefore a livelock may occur if an external agent
1259 continuously polls a memory location waiting to observe an update.
1260 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1261 written polling loops from denying visibility of updates to memory.
1263 config ARM_ERRATA_364296
1264 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1267 This options enables the workaround for the 364296 ARM1136
1268 r0p2 erratum (possible cache data corruption with
1269 hit-under-miss enabled). It sets the undocumented bit 31 in
1270 the auxiliary control register and the FI bit in the control
1271 register, thus disabling hit-under-miss without putting the
1272 processor into full low interrupt latency mode. ARM11MPCore
1275 config ARM_ERRATA_764369
1276 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1277 depends on CPU_V7 && SMP
1279 This option enables the workaround for erratum 764369
1280 affecting Cortex-A9 MPCore with two or more processors (all
1281 current revisions). Under certain timing circumstances, a data
1282 cache line maintenance operation by MVA targeting an Inner
1283 Shareable memory region may fail to proceed up to either the
1284 Point of Coherency or to the Point of Unification of the
1285 system. This workaround adds a DSB instruction before the
1286 relevant cache maintenance functions and sets a specific bit
1287 in the diagnostic control register of the SCU.
1289 config ARM_ERRATA_775420
1290 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1293 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1294 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1295 operation aborts with MMU exception, it might cause the processor
1296 to deadlock. This workaround puts DSB before executing ISB if
1297 an abort may occur on cache maintenance.
1299 config ARM_ERRATA_798181
1300 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1301 depends on CPU_V7 && SMP
1303 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1304 adequately shooting down all use of the old entries. This
1305 option enables the Linux kernel workaround for this erratum
1306 which sends an IPI to the CPUs that are running the same ASID
1307 as the one being invalidated.
1309 config ARM_ERRATA_773022
1310 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1313 This option enables the workaround for the 773022 Cortex-A15
1314 (up to r0p4) erratum. In certain rare sequences of code, the
1315 loop buffer may deliver incorrect instructions. This
1316 workaround disables the loop buffer to avoid the erratum.
1320 source "arch/arm/common/Kconfig"
1330 Find out whether you have ISA slots on your motherboard. ISA is the
1331 name of a bus system, i.e. the way the CPU talks to the other stuff
1332 inside your box. Other bus systems are PCI, EISA, MicroChannel
1333 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1334 newer boards don't support it. If you have ISA, say Y, otherwise N.
1336 # Select ISA DMA controller support
1341 # Select ISA DMA interface
1346 bool "PCI support" if MIGHT_HAVE_PCI
1348 Find out whether you have a PCI motherboard. PCI is the name of a
1349 bus system, i.e. the way the CPU talks to the other stuff inside
1350 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1351 VESA. If you have PCI, say Y, otherwise N.
1357 config PCI_NANOENGINE
1358 bool "BSE nanoEngine PCI support"
1359 depends on SA1100_NANOENGINE
1361 Enable PCI on the BSE nanoEngine board.
1366 config PCI_HOST_ITE8152
1368 depends on PCI && MACH_ARMCORE
1372 source "drivers/pci/Kconfig"
1373 source "drivers/pci/pcie/Kconfig"
1375 source "drivers/pcmcia/Kconfig"
1379 menu "Kernel Features"
1384 This option should be selected by machines which have an SMP-
1387 The only effect of this option is to make the SMP-related
1388 options available to the user for configuration.
1391 bool "Symmetric Multi-Processing"
1392 depends on CPU_V6K || CPU_V7
1393 depends on GENERIC_CLOCKEVENTS
1395 depends on MMU || ARM_MPU
1397 This enables support for systems with more than one CPU. If you have
1398 a system with only one CPU, say N. If you have a system with more
1399 than one CPU, say Y.
1401 If you say N here, the kernel will run on uni- and multiprocessor
1402 machines, but will use only one CPU of a multiprocessor machine. If
1403 you say Y here, the kernel will run on many, but not all,
1404 uniprocessor machines. On a uniprocessor machine, the kernel
1405 will run faster if you say N here.
1407 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1408 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1409 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1411 If you don't know what to do here, say N.
1414 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1415 depends on SMP && !XIP_KERNEL && MMU
1418 SMP kernels contain instructions which fail on non-SMP processors.
1419 Enabling this option allows the kernel to modify itself to make
1420 these instructions safe. Disabling it allows about 1K of space
1423 If you don't know what to do here, say Y.
1425 config ARM_CPU_TOPOLOGY
1426 bool "Support cpu topology definition"
1427 depends on SMP && CPU_V7
1430 Support ARM cpu topology definition. The MPIDR register defines
1431 affinity between processors which is then used to describe the cpu
1432 topology of an ARM System.
1435 bool "Multi-core scheduler support"
1436 depends on ARM_CPU_TOPOLOGY
1438 Multi-core scheduler support improves the CPU scheduler's decision
1439 making when dealing with multi-core CPU chips at a cost of slightly
1440 increased overhead in some places. If unsure say N here.
1443 bool "SMT scheduler support"
1444 depends on ARM_CPU_TOPOLOGY
1446 Improves the CPU scheduler's decision making when dealing with
1447 MultiThreading at a cost of slightly increased overhead in some
1448 places. If unsure say N here.
1453 This option enables support for the ARM system coherency unit
1455 config HAVE_ARM_ARCH_TIMER
1456 bool "Architected timer support"
1458 select ARM_ARCH_TIMER
1459 select GENERIC_CLOCKEVENTS
1461 This option enables support for the ARM architected timer
1466 select CLKSRC_OF if OF
1468 This options enables support for the ARM timer and watchdog unit
1471 bool "Multi-Cluster Power Management"
1472 depends on CPU_V7 && SMP
1474 This option provides the common power management infrastructure
1475 for (multi-)cluster based systems, such as big.LITTLE based
1479 bool "big.LITTLE support (Experimental)"
1480 depends on CPU_V7 && SMP
1483 This option enables support selections for the big.LITTLE
1484 system architecture.
1487 bool "big.LITTLE switcher support"
1488 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1489 select ARM_CPU_SUSPEND
1492 The big.LITTLE "switcher" provides the core functionality to
1493 transparently handle transition between a cluster of A15's
1494 and a cluster of A7's in a big.LITTLE system.
1496 config BL_SWITCHER_DUMMY_IF
1497 tristate "Simple big.LITTLE switcher user interface"
1498 depends on BL_SWITCHER && DEBUG_KERNEL
1500 This is a simple and dummy char dev interface to control
1501 the big.LITTLE switcher core code. It is meant for
1502 debugging purposes only.
1505 prompt "Memory split"
1509 Select the desired split between kernel and user memory.
1511 If you are not absolutely sure what you are doing, leave this
1515 bool "3G/1G user/kernel split"
1517 bool "2G/2G user/kernel split"
1519 bool "1G/3G user/kernel split"
1524 default PHYS_OFFSET if !MMU
1525 default 0x40000000 if VMSPLIT_1G
1526 default 0x80000000 if VMSPLIT_2G
1530 int "Maximum number of CPUs (2-32)"
1536 bool "Support for hot-pluggable CPUs"
1539 Say Y here to experiment with turning CPUs off and on. CPUs
1540 can be controlled through /sys/devices/system/cpu.
1543 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1546 Say Y here if you want Linux to communicate with system firmware
1547 implementing the PSCI specification for CPU-centric power
1548 management operations described in ARM document number ARM DEN
1549 0022A ("Power State Coordination Interface System Software on
1552 # The GPIO number here must be sorted by descending number. In case of
1553 # a multiplatform kernel, we just want the highest value required by the
1554 # selected platforms.
1557 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1558 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX
1559 default 416 if ARCH_SUNXI
1560 default 392 if ARCH_U8500
1561 default 352 if ARCH_VT8500
1562 default 264 if MACH_H4700
1565 Maximum number of GPIOs in the system.
1567 If unsure, leave the default value.
1569 source kernel/Kconfig.preempt
1573 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1574 ARCH_S5PV210 || ARCH_EXYNOS4
1575 default AT91_TIMER_HZ if ARCH_AT91
1576 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
1580 depends on HZ_FIXED = 0
1581 prompt "Timer frequency"
1605 default HZ_FIXED if HZ_FIXED != 0
1606 default 100 if HZ_100
1607 default 200 if HZ_200
1608 default 250 if HZ_250
1609 default 300 if HZ_300
1610 default 500 if HZ_500
1614 def_bool HIGH_RES_TIMERS
1616 config THUMB2_KERNEL
1617 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1618 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1619 default y if CPU_THUMBONLY
1621 select ARM_ASM_UNIFIED
1624 By enabling this option, the kernel will be compiled in
1625 Thumb-2 mode. A compiler/assembler that understand the unified
1626 ARM-Thumb syntax is needed.
1630 config THUMB2_AVOID_R_ARM_THM_JUMP11
1631 bool "Work around buggy Thumb-2 short branch relocations in gas"
1632 depends on THUMB2_KERNEL && MODULES
1635 Various binutils versions can resolve Thumb-2 branches to
1636 locally-defined, preemptible global symbols as short-range "b.n"
1637 branch instructions.
1639 This is a problem, because there's no guarantee the final
1640 destination of the symbol, or any candidate locations for a
1641 trampoline, are within range of the branch. For this reason, the
1642 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1643 relocation in modules at all, and it makes little sense to add
1646 The symptom is that the kernel fails with an "unsupported
1647 relocation" error when loading some modules.
1649 Until fixed tools are available, passing
1650 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1651 code which hits this problem, at the cost of a bit of extra runtime
1652 stack usage in some cases.
1654 The problem is described in more detail at:
1655 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1657 Only Thumb-2 kernels are affected.
1659 Unless you are sure your tools don't have this problem, say Y.
1661 config ARM_ASM_UNIFIED
1665 bool "Use the ARM EABI to compile the kernel"
1667 This option allows for the kernel to be compiled using the latest
1668 ARM ABI (aka EABI). This is only useful if you are using a user
1669 space environment that is also compiled with EABI.
1671 Since there are major incompatibilities between the legacy ABI and
1672 EABI, especially with regard to structure member alignment, this
1673 option also changes the kernel syscall calling convention to
1674 disambiguate both ABIs and allow for backward compatibility support
1675 (selected with CONFIG_OABI_COMPAT).
1677 To use this you need GCC version 4.0.0 or later.
1680 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1681 depends on AEABI && !THUMB2_KERNEL
1683 This option preserves the old syscall interface along with the
1684 new (ARM EABI) one. It also provides a compatibility layer to
1685 intercept syscalls that have structure arguments which layout
1686 in memory differs between the legacy ABI and the new ARM EABI
1687 (only for non "thumb" binaries). This option adds a tiny
1688 overhead to all syscalls and produces a slightly larger kernel.
1690 The seccomp filter system will not be available when this is
1691 selected, since there is no way yet to sensibly distinguish
1692 between calling conventions during filtering.
1694 If you know you'll be using only pure EABI user space then you
1695 can say N here. If this option is not selected and you attempt
1696 to execute a legacy ABI binary then the result will be
1697 UNPREDICTABLE (in fact it can be predicted that it won't work
1698 at all). If in doubt say N.
1700 config ARCH_HAS_HOLES_MEMORYMODEL
1703 config ARCH_SPARSEMEM_ENABLE
1706 config ARCH_SPARSEMEM_DEFAULT
1707 def_bool ARCH_SPARSEMEM_ENABLE
1709 config ARCH_SELECT_MEMORY_MODEL
1710 def_bool ARCH_SPARSEMEM_ENABLE
1712 config HAVE_ARCH_PFN_VALID
1713 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1716 bool "High Memory Support"
1719 The address space of ARM processors is only 4 Gigabytes large
1720 and it has to accommodate user address space, kernel address
1721 space as well as some memory mapped IO. That means that, if you
1722 have a large amount of physical memory and/or IO, not all of the
1723 memory can be "permanently mapped" by the kernel. The physical
1724 memory that is not permanently mapped is called "high memory".
1726 Depending on the selected kernel/user memory split, minimum
1727 vmalloc space and actual amount of RAM, you may not need this
1728 option which should result in a slightly faster kernel.
1733 bool "Allocate 2nd-level pagetables from highmem"
1736 config HW_PERF_EVENTS
1737 bool "Enable hardware performance counter support for perf events"
1738 depends on PERF_EVENTS
1741 Enable hardware performance counter support for perf events. If
1742 disabled, perf events will use software events only.
1744 config SYS_SUPPORTS_HUGETLBFS
1748 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1752 config ARCH_WANT_GENERAL_HUGETLB
1757 config FORCE_MAX_ZONEORDER
1758 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
1759 range 11 64 if ARCH_SHMOBILE_LEGACY
1760 default "12" if SOC_AM33XX
1761 default "9" if SA1111 || ARCH_EFM32
1764 The kernel memory allocator divides physically contiguous memory
1765 blocks into "zones", where each zone is a power of two number of
1766 pages. This option selects the largest power of two that the kernel
1767 keeps in the memory allocator. If you need to allocate very large
1768 blocks of physically contiguous memory, then you may need to
1769 increase this value.
1771 This config option is actually maximum order plus one. For example,
1772 a value of 11 means that the largest free memory block is 2^10 pages.
1774 config ALIGNMENT_TRAP
1776 depends on CPU_CP15_MMU
1777 default y if !ARCH_EBSA110
1778 select HAVE_PROC_CPU if PROC_FS
1780 ARM processors cannot fetch/store information which is not
1781 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1782 address divisible by 4. On 32-bit ARM processors, these non-aligned
1783 fetch/store instructions will be emulated in software if you say
1784 here, which has a severe performance impact. This is necessary for
1785 correct operation of some network protocols. With an IP-only
1786 configuration it is safe to say N, otherwise say Y.
1788 config UACCESS_WITH_MEMCPY
1789 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1791 default y if CPU_FEROCEON
1793 Implement faster copy_to_user and clear_user methods for CPU
1794 cores where a 8-word STM instruction give significantly higher
1795 memory write throughput than a sequence of individual 32bit stores.
1797 A possible side effect is a slight increase in scheduling latency
1798 between threads sharing the same address space if they invoke
1799 such copy operations with large buffers.
1801 However, if the CPU data cache is using a write-allocate mode,
1802 this option is unlikely to provide any performance gain.
1806 prompt "Enable seccomp to safely compute untrusted bytecode"
1808 This kernel feature is useful for number crunching applications
1809 that may need to compute untrusted bytecode during their
1810 execution. By using pipes or other transports made available to
1811 the process as file descriptors supporting the read/write
1812 syscalls, it's possible to isolate those applications in
1813 their own address space using seccomp. Once seccomp is
1814 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1815 and the task is only allowed to execute a few safe syscalls
1816 defined by each seccomp mode.
1829 bool "Xen guest support on ARM (EXPERIMENTAL)"
1830 depends on ARM && AEABI && OF
1831 depends on CPU_V7 && !CPU_V6
1832 depends on !GENERIC_ATOMIC64
1834 select ARCH_DMA_ADDR_T_64BIT
1838 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1845 bool "Flattened Device Tree support"
1848 select OF_EARLY_FLATTREE
1849 select OF_RESERVED_MEM
1851 Include support for flattened device tree machine descriptions.
1854 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1857 This is the traditional way of passing data to the kernel at boot
1858 time. If you are solely relying on the flattened device tree (or
1859 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1860 to remove ATAGS support from your kernel binary. If unsure,
1863 config DEPRECATED_PARAM_STRUCT
1864 bool "Provide old way to pass kernel parameters"
1867 This was deprecated in 2001 and announced to live on for 5 years.
1868 Some old boot loaders still use this way.
1870 # Compressed boot loader in ROM. Yes, we really want to ask about
1871 # TEXT and BSS so we preserve their values in the config files.
1872 config ZBOOT_ROM_TEXT
1873 hex "Compressed ROM boot loader base address"
1876 The physical address at which the ROM-able zImage is to be
1877 placed in the target. Platforms which normally make use of
1878 ROM-able zImage formats normally set this to a suitable
1879 value in their defconfig file.
1881 If ZBOOT_ROM is not enabled, this has no effect.
1883 config ZBOOT_ROM_BSS
1884 hex "Compressed ROM boot loader BSS address"
1887 The base address of an area of read/write memory in the target
1888 for the ROM-able zImage which must be available while the
1889 decompressor is running. It must be large enough to hold the
1890 entire decompressed kernel plus an additional 128 KiB.
1891 Platforms which normally make use of ROM-able zImage formats
1892 normally set this to a suitable value in their defconfig file.
1894 If ZBOOT_ROM is not enabled, this has no effect.
1897 bool "Compressed boot loader in ROM/flash"
1898 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1899 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1901 Say Y here if you intend to execute your compressed kernel image
1902 (zImage) directly from ROM or flash. If unsure, say N.
1905 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1906 depends on ZBOOT_ROM && ARCH_SH7372
1907 default ZBOOT_ROM_NONE
1909 Include experimental SD/MMC loading code in the ROM-able zImage.
1910 With this enabled it is possible to write the ROM-able zImage
1911 kernel image to an MMC or SD card and boot the kernel straight
1912 from the reset vector. At reset the processor Mask ROM will load
1913 the first part of the ROM-able zImage which in turn loads the
1914 rest the kernel image to RAM.
1916 config ZBOOT_ROM_NONE
1917 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1919 Do not load image from SD or MMC
1921 config ZBOOT_ROM_MMCIF
1922 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1924 Load image from MMCIF hardware block.
1926 config ZBOOT_ROM_SH_MOBILE_SDHI
1927 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1929 Load image from SDHI hardware block
1933 config ARM_APPENDED_DTB
1934 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1937 With this option, the boot code will look for a device tree binary
1938 (DTB) appended to zImage
1939 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1941 This is meant as a backward compatibility convenience for those
1942 systems with a bootloader that can't be upgraded to accommodate
1943 the documented boot protocol using a device tree.
1945 Beware that there is very little in terms of protection against
1946 this option being confused by leftover garbage in memory that might
1947 look like a DTB header after a reboot if no actual DTB is appended
1948 to zImage. Do not leave this option active in a production kernel
1949 if you don't intend to always append a DTB. Proper passing of the
1950 location into r2 of a bootloader provided DTB is always preferable
1953 config ARM_ATAG_DTB_COMPAT
1954 bool "Supplement the appended DTB with traditional ATAG information"
1955 depends on ARM_APPENDED_DTB
1957 Some old bootloaders can't be updated to a DTB capable one, yet
1958 they provide ATAGs with memory configuration, the ramdisk address,
1959 the kernel cmdline string, etc. Such information is dynamically
1960 provided by the bootloader and can't always be stored in a static
1961 DTB. To allow a device tree enabled kernel to be used with such
1962 bootloaders, this option allows zImage to extract the information
1963 from the ATAG list and store it at run time into the appended DTB.
1966 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1967 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1969 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1970 bool "Use bootloader kernel arguments if available"
1972 Uses the command-line options passed by the boot loader instead of
1973 the device tree bootargs property. If the boot loader doesn't provide
1974 any, the device tree bootargs property will be used.
1976 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1977 bool "Extend with bootloader kernel arguments"
1979 The command-line arguments provided by the boot loader will be
1980 appended to the the device tree bootargs property.
1985 string "Default kernel command string"
1988 On some architectures (EBSA110 and CATS), there is currently no way
1989 for the boot loader to pass arguments to the kernel. For these
1990 architectures, you should supply some command-line options at build
1991 time by entering them here. As a minimum, you should specify the
1992 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1995 prompt "Kernel command line type" if CMDLINE != ""
1996 default CMDLINE_FROM_BOOTLOADER
1999 config CMDLINE_FROM_BOOTLOADER
2000 bool "Use bootloader kernel arguments if available"
2002 Uses the command-line options passed by the boot loader. If
2003 the boot loader doesn't provide any, the default kernel command
2004 string provided in CMDLINE will be used.
2006 config CMDLINE_EXTEND
2007 bool "Extend bootloader kernel arguments"
2009 The command-line arguments provided by the boot loader will be
2010 appended to the default kernel command string.
2012 config CMDLINE_FORCE
2013 bool "Always use the default kernel command string"
2015 Always use the default kernel command string, even if the boot
2016 loader passes other arguments to the kernel.
2017 This is useful if you cannot or don't want to change the
2018 command-line options your boot loader passes to the kernel.
2022 bool "Kernel Execute-In-Place from ROM"
2023 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
2025 Execute-In-Place allows the kernel to run from non-volatile storage
2026 directly addressable by the CPU, such as NOR flash. This saves RAM
2027 space since the text section of the kernel is not loaded from flash
2028 to RAM. Read-write sections, such as the data section and stack,
2029 are still copied to RAM. The XIP kernel is not compressed since
2030 it has to run directly from flash, so it will take more space to
2031 store it. The flash address used to link the kernel object files,
2032 and for storing it, is configuration dependent. Therefore, if you
2033 say Y here, you must know the proper physical address where to
2034 store the kernel image depending on your own flash memory usage.
2036 Also note that the make target becomes "make xipImage" rather than
2037 "make zImage" or "make Image". The final kernel binary to put in
2038 ROM memory will be arch/arm/boot/xipImage.
2042 config XIP_PHYS_ADDR
2043 hex "XIP Kernel Physical Location"
2044 depends on XIP_KERNEL
2045 default "0x00080000"
2047 This is the physical address in your flash memory the kernel will
2048 be linked for and stored to. This address is dependent on your
2052 bool "Kexec system call (EXPERIMENTAL)"
2053 depends on (!SMP || PM_SLEEP_SMP)
2055 kexec is a system call that implements the ability to shutdown your
2056 current kernel, and to start another kernel. It is like a reboot
2057 but it is independent of the system firmware. And like a reboot
2058 you can start any kernel with it, not just Linux.
2060 It is an ongoing process to be certain the hardware in a machine
2061 is properly shutdown, so do not be surprised if this code does not
2062 initially work for you.
2065 bool "Export atags in procfs"
2066 depends on ATAGS && KEXEC
2069 Should the atags used to boot the kernel be exported in an "atags"
2070 file in procfs. Useful with kexec.
2073 bool "Build kdump crash kernel (EXPERIMENTAL)"
2075 Generate crash dump after being started by kexec. This should
2076 be normally only set in special crash dump kernels which are
2077 loaded in the main kernel with kexec-tools into a specially
2078 reserved region and then later executed after a crash by
2079 kdump/kexec. The crash dump kernel must be compiled to a
2080 memory address not used by the main kernel
2082 For more details see Documentation/kdump/kdump.txt
2084 config AUTO_ZRELADDR
2085 bool "Auto calculation of the decompressed kernel image address"
2087 ZRELADDR is the physical address where the decompressed kernel
2088 image will be placed. If AUTO_ZRELADDR is selected, the address
2089 will be determined at run-time by masking the current IP with
2090 0xf8000000. This assumes the zImage being placed in the first 128MB
2091 from start of memory.
2095 menu "CPU Power Management"
2097 source "drivers/cpufreq/Kconfig"
2099 source "drivers/cpuidle/Kconfig"
2103 menu "Floating point emulation"
2105 comment "At least one emulation must be selected"
2108 bool "NWFPE math emulation"
2109 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2111 Say Y to include the NWFPE floating point emulator in the kernel.
2112 This is necessary to run most binaries. Linux does not currently
2113 support floating point hardware so you need to say Y here even if
2114 your machine has an FPA or floating point co-processor podule.
2116 You may say N here if you are going to load the Acorn FPEmulator
2117 early in the bootup.
2120 bool "Support extended precision"
2121 depends on FPE_NWFPE
2123 Say Y to include 80-bit support in the kernel floating-point
2124 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2125 Note that gcc does not generate 80-bit operations by default,
2126 so in most cases this option only enlarges the size of the
2127 floating point emulator without any good reason.
2129 You almost surely want to say N here.
2132 bool "FastFPE math emulation (EXPERIMENTAL)"
2133 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2135 Say Y here to include the FAST floating point emulator in the kernel.
2136 This is an experimental much faster emulator which now also has full
2137 precision for the mantissa. It does not support any exceptions.
2138 It is very simple, and approximately 3-6 times faster than NWFPE.
2140 It should be sufficient for most programs. It may be not suitable
2141 for scientific calculations, but you have to check this for yourself.
2142 If you do not feel you need a faster FP emulation you should better
2146 bool "VFP-format floating point maths"
2147 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2149 Say Y to include VFP support code in the kernel. This is needed
2150 if your hardware includes a VFP unit.
2152 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2153 release notes and additional status information.
2155 Say N if your target does not have VFP hardware.
2163 bool "Advanced SIMD (NEON) Extension support"
2164 depends on VFPv3 && CPU_V7
2166 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2169 config KERNEL_MODE_NEON
2170 bool "Support for NEON in kernel mode"
2171 depends on NEON && AEABI
2173 Say Y to include support for NEON in kernel mode.
2177 menu "Userspace binary formats"
2179 source "fs/Kconfig.binfmt"
2182 tristate "RISC OS personality"
2185 Say Y here to include the kernel code necessary if you want to run
2186 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2187 experimental; if this sounds frightening, say N and sleep in peace.
2188 You can also say M here to compile this support as a module (which
2189 will be called arthur).
2193 menu "Power management options"
2195 source "kernel/power/Kconfig"
2197 config ARCH_SUSPEND_POSSIBLE
2198 depends on !ARCH_S5PC100
2199 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2200 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2203 config ARM_CPU_SUSPEND
2206 config ARCH_HIBERNATION_POSSIBLE
2209 default y if ARCH_SUSPEND_POSSIBLE
2213 source "net/Kconfig"
2215 source "drivers/Kconfig"
2219 source "arch/arm/Kconfig.debug"
2221 source "security/Kconfig"
2223 source "crypto/Kconfig"
2225 source "lib/Kconfig"
2227 source "arch/arm/kvm/Kconfig"