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_USE_CMPXCHG_LOCKREF
10 select ARCH_WANT_IPC_PARSE_VERSION
11 select BUILDTIME_EXTABLE_SORT if MMU
12 select CLONE_BACKWARDS
13 select CPU_PM if (SUSPEND || CPU_IDLE)
14 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
15 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
16 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
17 select GENERIC_IDLE_POLL_SETUP
18 select GENERIC_IRQ_PROBE
19 select GENERIC_IRQ_SHOW
20 select GENERIC_PCI_IOMAP
21 select GENERIC_SCHED_CLOCK
22 select GENERIC_SMP_IDLE_THREAD
23 select GENERIC_STRNCPY_FROM_USER
24 select GENERIC_STRNLEN_USER
25 select HARDIRQS_SW_RESEND
26 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
28 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
29 select HAVE_ARCH_TRACEHOOK
31 select HAVE_CONTEXT_TRACKING
32 select HAVE_C_RECORDMCOUNT
33 select HAVE_DEBUG_KMEMLEAK
34 select HAVE_DMA_API_DEBUG
36 select HAVE_DMA_CONTIGUOUS if MMU
37 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
38 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
39 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
40 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
41 select HAVE_GENERIC_DMA_COHERENT
42 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
43 select HAVE_IDE if PCI || ISA || PCMCIA
44 select HAVE_IRQ_TIME_ACCOUNTING
45 select HAVE_KERNEL_GZIP
46 select HAVE_KERNEL_LZ4
47 select HAVE_KERNEL_LZMA
48 select HAVE_KERNEL_LZO
50 select HAVE_KPROBES if !XIP_KERNEL
51 select HAVE_KRETPROBES if (HAVE_KPROBES)
53 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
54 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
55 select HAVE_PERF_EVENTS
57 select HAVE_PERF_USER_STACK_DUMP
58 select HAVE_REGS_AND_STACK_ACCESS_API
59 select HAVE_SYSCALL_TRACEPOINTS
61 select HAVE_VIRT_CPU_ACCOUNTING_GEN
62 select IRQ_FORCED_THREADING
64 select MODULES_USE_ELF_REL
66 select OLD_SIGSUSPEND3
67 select PERF_USE_VMALLOC
69 select SYS_SUPPORTS_APM_EMULATION
70 # Above selects are sorted alphabetically; please add new ones
71 # according to that. Thanks.
73 The ARM series is a line of low-power-consumption RISC chip designs
74 licensed by ARM Ltd and targeted at embedded applications and
75 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
76 manufactured, but legacy ARM-based PC hardware remains popular in
77 Europe. There is an ARM Linux project with a web page at
78 <http://www.arm.linux.org.uk/>.
80 config ARM_HAS_SG_CHAIN
83 config NEED_SG_DMA_LENGTH
86 config ARM_DMA_USE_IOMMU
88 select ARM_HAS_SG_CHAIN
89 select NEED_SG_DMA_LENGTH
93 config ARM_DMA_IOMMU_ALIGNMENT
94 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
98 DMA mapping framework by default aligns all buffers to the smallest
99 PAGE_SIZE order which is greater than or equal to the requested buffer
100 size. This works well for buffers up to a few hundreds kilobytes, but
101 for larger buffers it just a waste of address space. Drivers which has
102 relatively small addressing window (like 64Mib) might run out of
103 virtual space with just a few allocations.
105 With this parameter you can specify the maximum PAGE_SIZE order for
106 DMA IOMMU buffers. Larger buffers will be aligned only to this
107 specified order. The order is expressed as a power of two multiplied
115 config MIGHT_HAVE_PCI
118 config SYS_SUPPORTS_APM_EMULATION
123 select GENERIC_ALLOCATOR
134 The Extended Industry Standard Architecture (EISA) bus was
135 developed as an open alternative to the IBM MicroChannel bus.
137 The EISA bus provided some of the features of the IBM MicroChannel
138 bus while maintaining backward compatibility with cards made for
139 the older ISA bus. The EISA bus saw limited use between 1988 and
140 1995 when it was made obsolete by the PCI bus.
142 Say Y here if you are building a kernel for an EISA-based machine.
149 config STACKTRACE_SUPPORT
153 config HAVE_LATENCYTOP_SUPPORT
158 config LOCKDEP_SUPPORT
162 config TRACE_IRQFLAGS_SUPPORT
166 config RWSEM_GENERIC_SPINLOCK
170 config RWSEM_XCHGADD_ALGORITHM
173 config ARCH_HAS_ILOG2_U32
176 config ARCH_HAS_ILOG2_U64
179 config ARCH_HAS_CPUFREQ
182 Internal node to signify that the ARCH has CPUFREQ support
183 and that the relevant menu configurations are displayed for
186 config ARCH_HAS_BANDGAP
189 config GENERIC_HWEIGHT
193 config GENERIC_CALIBRATE_DELAY
197 config ARCH_MAY_HAVE_PC_FDC
203 config NEED_DMA_MAP_STATE
206 config ARCH_HAS_DMA_SET_COHERENT_MASK
209 config GENERIC_ISA_DMA
215 config NEED_RET_TO_USER
223 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
224 default DRAM_BASE if REMAP_VECTORS_TO_RAM
227 The base address of exception vectors. This must be two pages
230 config ARM_PATCH_PHYS_VIRT
231 bool "Patch physical to virtual translations at runtime" if EMBEDDED
233 depends on !XIP_KERNEL && MMU
234 depends on !ARCH_REALVIEW || !SPARSEMEM
236 Patch phys-to-virt and virt-to-phys translation functions at
237 boot and module load time according to the position of the
238 kernel in system memory.
240 This can only be used with non-XIP MMU kernels where the base
241 of physical memory is at a 16MB boundary.
243 Only disable this option if you know that you do not require
244 this feature (eg, building a kernel for a single machine) and
245 you need to shrink the kernel to the minimal size.
247 config NEED_MACH_GPIO_H
250 Select this when mach/gpio.h is required to provide special
251 definitions for this platform. The need for mach/gpio.h should
252 be avoided when possible.
254 config NEED_MACH_IO_H
257 Select this when mach/io.h is required to provide special
258 definitions for this platform. The need for mach/io.h should
259 be avoided when possible.
261 config NEED_MACH_MEMORY_H
264 Select this when mach/memory.h is required to provide special
265 definitions for this platform. The need for mach/memory.h should
266 be avoided when possible.
269 hex "Physical address of main memory" if MMU
270 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
271 default DRAM_BASE if !MMU
273 Please provide the physical address corresponding to the
274 location of main memory in your system.
280 source "init/Kconfig"
282 source "kernel/Kconfig.freezer"
287 bool "MMU-based Paged Memory Management Support"
290 Select if you want MMU-based virtualised addressing space
291 support by paged memory management. If unsure, say 'Y'.
294 # The "ARM system type" choice list is ordered alphabetically by option
295 # text. Please add new entries in the option alphabetic order.
298 prompt "ARM system type"
299 default ARCH_VERSATILE if !MMU
300 default ARCH_MULTIPLATFORM if MMU
302 config ARCH_MULTIPLATFORM
303 bool "Allow multiple platforms to be selected"
305 select ARM_PATCH_PHYS_VIRT
308 select MULTI_IRQ_HANDLER
312 config ARCH_INTEGRATOR
313 bool "ARM Ltd. Integrator family"
314 select ARCH_HAS_CPUFREQ
317 select COMMON_CLK_VERSATILE
318 select GENERIC_CLOCKEVENTS
321 select MULTI_IRQ_HANDLER
322 select NEED_MACH_MEMORY_H
323 select PLAT_VERSATILE
326 select VERSATILE_FPGA_IRQ
328 Support for ARM's Integrator platform.
331 bool "ARM Ltd. RealView family"
332 select ARCH_WANT_OPTIONAL_GPIOLIB
334 select ARM_TIMER_SP804
336 select COMMON_CLK_VERSATILE
337 select GENERIC_CLOCKEVENTS
338 select GPIO_PL061 if GPIOLIB
340 select NEED_MACH_MEMORY_H
341 select PLAT_VERSATILE
342 select PLAT_VERSATILE_CLCD
344 This enables support for ARM Ltd RealView boards.
346 config ARCH_VERSATILE
347 bool "ARM Ltd. Versatile family"
348 select ARCH_WANT_OPTIONAL_GPIOLIB
350 select ARM_TIMER_SP804
353 select GENERIC_CLOCKEVENTS
354 select HAVE_MACH_CLKDEV
356 select PLAT_VERSATILE
357 select PLAT_VERSATILE_CLCD
358 select PLAT_VERSATILE_CLOCK
359 select VERSATILE_FPGA_IRQ
361 This enables support for ARM Ltd Versatile board.
365 select ARCH_REQUIRE_GPIOLIB
368 select NEED_MACH_GPIO_H
369 select NEED_MACH_IO_H if PCCARD
371 select PINCTRL_AT91 if USE_OF
373 This enables support for systems based on Atmel
374 AT91RM9200 and AT91SAM9* processors.
377 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
378 select ARCH_REQUIRE_GPIOLIB
383 select GENERIC_CLOCKEVENTS
385 select MULTI_IRQ_HANDLER
388 Support for Cirrus Logic 711x/721x/731x based boards.
391 bool "Cortina Systems Gemini"
392 select ARCH_REQUIRE_GPIOLIB
395 select GENERIC_CLOCKEVENTS
397 Support for the Cortina Systems Gemini family SoCs
401 select ARCH_USES_GETTIMEOFFSET
404 select NEED_MACH_IO_H
405 select NEED_MACH_MEMORY_H
408 This is an evaluation board for the StrongARM processor available
409 from Digital. It has limited hardware on-board, including an
410 Ethernet interface, two PCMCIA sockets, two serial ports and a
415 select ARCH_HAS_HOLES_MEMORYMODEL
416 select ARCH_REQUIRE_GPIOLIB
417 select ARCH_USES_GETTIMEOFFSET
422 select NEED_MACH_MEMORY_H
424 This enables support for the Cirrus EP93xx series of CPUs.
426 config ARCH_FOOTBRIDGE
430 select GENERIC_CLOCKEVENTS
432 select NEED_MACH_IO_H if !MMU
433 select NEED_MACH_MEMORY_H
435 Support for systems based on the DC21285 companion chip
436 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
439 bool "Hilscher NetX based"
443 select GENERIC_CLOCKEVENTS
445 This enables support for systems based on the Hilscher NetX Soc
451 select NEED_MACH_MEMORY_H
452 select NEED_RET_TO_USER
457 Support for Intel's IOP13XX (XScale) family of processors.
462 select ARCH_REQUIRE_GPIOLIB
465 select NEED_RET_TO_USER
469 Support for Intel's 80219 and IOP32X (XScale) family of
475 select ARCH_REQUIRE_GPIOLIB
478 select NEED_RET_TO_USER
482 Support for Intel's IOP33X (XScale) family of processors.
487 select ARCH_HAS_DMA_SET_COHERENT_MASK
488 select ARCH_SUPPORTS_BIG_ENDIAN
489 select ARCH_REQUIRE_GPIOLIB
492 select DMABOUNCE if PCI
493 select GENERIC_CLOCKEVENTS
494 select MIGHT_HAVE_PCI
495 select NEED_MACH_IO_H
496 select USB_EHCI_BIG_ENDIAN_DESC
497 select USB_EHCI_BIG_ENDIAN_MMIO
499 Support for Intel's IXP4XX (XScale) family of processors.
503 select ARCH_REQUIRE_GPIOLIB
505 select GENERIC_CLOCKEVENTS
506 select MIGHT_HAVE_PCI
510 select PLAT_ORION_LEGACY
511 select USB_ARCH_HAS_EHCI
513 Support for the Marvell Dove SoC 88AP510
516 bool "Marvell Kirkwood"
517 select ARCH_HAS_CPUFREQ
518 select ARCH_REQUIRE_GPIOLIB
520 select GENERIC_CLOCKEVENTS
525 select PINCTRL_KIRKWOOD
526 select PLAT_ORION_LEGACY
528 Support for the following Marvell Kirkwood series SoCs:
529 88F6180, 88F6192 and 88F6281.
532 bool "Marvell MV78xx0"
533 select ARCH_REQUIRE_GPIOLIB
535 select GENERIC_CLOCKEVENTS
538 select PLAT_ORION_LEGACY
540 Support for the following Marvell MV78xx0 series SoCs:
546 select ARCH_REQUIRE_GPIOLIB
548 select GENERIC_CLOCKEVENTS
551 select PLAT_ORION_LEGACY
553 Support for the following Marvell Orion 5x series SoCs:
554 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
555 Orion-2 (5281), Orion-1-90 (6183).
558 bool "Marvell PXA168/910/MMP2"
560 select ARCH_REQUIRE_GPIOLIB
562 select GENERIC_ALLOCATOR
563 select GENERIC_CLOCKEVENTS
566 select MULTI_IRQ_HANDLER
571 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
574 bool "Micrel/Kendin KS8695"
575 select ARCH_REQUIRE_GPIOLIB
578 select GENERIC_CLOCKEVENTS
579 select NEED_MACH_MEMORY_H
581 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
582 System-on-Chip devices.
585 bool "Nuvoton W90X900 CPU"
586 select ARCH_REQUIRE_GPIOLIB
590 select GENERIC_CLOCKEVENTS
592 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
593 At present, the w90x900 has been renamed nuc900, regarding
594 the ARM series product line, you can login the following
595 link address to know more.
597 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
598 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
602 select ARCH_REQUIRE_GPIOLIB
607 select GENERIC_CLOCKEVENTS
610 select USB_ARCH_HAS_OHCI
613 Support for the NXP LPC32XX family of processors
616 bool "PXA2xx/PXA3xx-based"
618 select ARCH_HAS_CPUFREQ
620 select ARCH_REQUIRE_GPIOLIB
621 select ARM_CPU_SUSPEND if PM
625 select GENERIC_CLOCKEVENTS
628 select MULTI_IRQ_HANDLER
632 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
636 select ARCH_REQUIRE_GPIOLIB
637 select CLKSRC_OF if OF
639 select GENERIC_CLOCKEVENTS
641 Support for Qualcomm MSM/QSD based systems. This runs on the
642 apps processor of the MSM/QSD and depends on a shared memory
643 interface to the modem processor which runs the baseband
644 stack and controls some vital subsystems
645 (clock and power control, etc).
648 bool "Renesas SH-Mobile / R-Mobile"
649 select ARM_PATCH_PHYS_VIRT
651 select GENERIC_CLOCKEVENTS
652 select HAVE_ARM_SCU if SMP
653 select HAVE_ARM_TWD if SMP
654 select HAVE_MACH_CLKDEV
656 select MIGHT_HAVE_CACHE_L2X0
657 select MULTI_IRQ_HANDLER
660 select PM_GENERIC_DOMAINS if PM
663 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
668 select ARCH_MAY_HAVE_PC_FDC
669 select ARCH_SPARSEMEM_ENABLE
670 select ARCH_USES_GETTIMEOFFSET
673 select HAVE_PATA_PLATFORM
675 select NEED_MACH_IO_H
676 select NEED_MACH_MEMORY_H
680 On the Acorn Risc-PC, Linux can support the internal IDE disk and
681 CD-ROM interface, serial and parallel port, and the floppy drive.
685 select ARCH_HAS_CPUFREQ
687 select ARCH_REQUIRE_GPIOLIB
688 select ARCH_SPARSEMEM_ENABLE
693 select GENERIC_CLOCKEVENTS
696 select NEED_MACH_MEMORY_H
699 Support for StrongARM 11x0 based boards.
702 bool "Samsung S3C24XX SoCs"
703 select ARCH_HAS_CPUFREQ
704 select ARCH_REQUIRE_GPIOLIB
706 select CLKSRC_SAMSUNG_PWM
707 select GENERIC_CLOCKEVENTS
709 select HAVE_S3C2410_I2C if I2C
710 select HAVE_S3C2410_WATCHDOG if WATCHDOG
711 select HAVE_S3C_RTC if RTC_CLASS
712 select MULTI_IRQ_HANDLER
713 select NEED_MACH_GPIO_H
714 select NEED_MACH_IO_H
717 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
718 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
719 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
720 Samsung SMDK2410 development board (and derivatives).
723 bool "Samsung S3C64XX"
724 select ARCH_HAS_CPUFREQ
725 select ARCH_REQUIRE_GPIOLIB
729 select CLKSRC_SAMSUNG_PWM
732 select GENERIC_CLOCKEVENTS
734 select HAVE_S3C2410_I2C if I2C
735 select HAVE_S3C2410_WATCHDOG if WATCHDOG
737 select NEED_MACH_GPIO_H
740 select PM_GENERIC_DOMAINS
742 select S3C_GPIO_TRACK
744 select SAMSUNG_GPIOLIB_4BIT
745 select SAMSUNG_WAKEMASK
746 select SAMSUNG_WDT_RESET
747 select USB_ARCH_HAS_OHCI
749 Samsung S3C64XX series based systems
752 bool "Samsung S5P6440 S5P6450"
754 select CLKSRC_SAMSUNG_PWM
756 select GENERIC_CLOCKEVENTS
758 select HAVE_S3C2410_I2C if I2C
759 select HAVE_S3C2410_WATCHDOG if WATCHDOG
760 select HAVE_S3C_RTC if RTC_CLASS
761 select NEED_MACH_GPIO_H
763 select SAMSUNG_WDT_RESET
765 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
769 bool "Samsung S5PC100"
770 select ARCH_REQUIRE_GPIOLIB
772 select CLKSRC_SAMSUNG_PWM
774 select GENERIC_CLOCKEVENTS
776 select HAVE_S3C2410_I2C if I2C
777 select HAVE_S3C2410_WATCHDOG if WATCHDOG
778 select HAVE_S3C_RTC if RTC_CLASS
779 select NEED_MACH_GPIO_H
781 select SAMSUNG_WDT_RESET
783 Samsung S5PC100 series based systems
786 bool "Samsung S5PV210/S5PC110"
787 select ARCH_HAS_CPUFREQ
788 select ARCH_HAS_HOLES_MEMORYMODEL
789 select ARCH_SPARSEMEM_ENABLE
791 select CLKSRC_SAMSUNG_PWM
793 select GENERIC_CLOCKEVENTS
795 select HAVE_S3C2410_I2C if I2C
796 select HAVE_S3C2410_WATCHDOG if WATCHDOG
797 select HAVE_S3C_RTC if RTC_CLASS
798 select NEED_MACH_GPIO_H
799 select NEED_MACH_MEMORY_H
802 Samsung S5PV210/S5PC110 series based systems
805 bool "Samsung EXYNOS"
806 select ARCH_HAS_CPUFREQ
807 select ARCH_HAS_HOLES_MEMORYMODEL
808 select ARCH_REQUIRE_GPIOLIB
809 select ARCH_SPARSEMEM_ENABLE
813 select GENERIC_CLOCKEVENTS
814 select HAVE_S3C2410_I2C if I2C
815 select HAVE_S3C2410_WATCHDOG if WATCHDOG
816 select HAVE_S3C_RTC if RTC_CLASS
817 select NEED_MACH_MEMORY_H
821 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
825 select ARCH_HAS_HOLES_MEMORYMODEL
826 select ARCH_REQUIRE_GPIOLIB
828 select GENERIC_ALLOCATOR
829 select GENERIC_CLOCKEVENTS
830 select GENERIC_IRQ_CHIP
836 Support for TI's DaVinci platform.
841 select ARCH_HAS_CPUFREQ
842 select ARCH_HAS_HOLES_MEMORYMODEL
844 select ARCH_REQUIRE_GPIOLIB
847 select GENERIC_CLOCKEVENTS
848 select GENERIC_IRQ_CHIP
851 select NEED_MACH_IO_H if PCCARD
852 select NEED_MACH_MEMORY_H
854 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
858 menu "Multiple platform selection"
859 depends on ARCH_MULTIPLATFORM
861 comment "CPU Core family selection"
863 config ARCH_MULTI_V4T
864 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
865 depends on !ARCH_MULTI_V6_V7
866 select ARCH_MULTI_V4_V5
867 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
868 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
869 CPU_ARM925T || CPU_ARM940T)
872 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
873 depends on !ARCH_MULTI_V6_V7
874 select ARCH_MULTI_V4_V5
875 select CPU_ARM926T if (!CPU_ARM946E || CPU_ARM1020 || \
876 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
877 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
879 config ARCH_MULTI_V4_V5
883 bool "ARMv6 based platforms (ARM11)"
884 select ARCH_MULTI_V6_V7
888 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
890 select ARCH_MULTI_V6_V7
893 config ARCH_MULTI_V6_V7
896 config ARCH_MULTI_CPU_AUTO
897 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
903 # This is sorted alphabetically by mach-* pathname. However, plat-*
904 # Kconfigs may be included either alphabetically (according to the
905 # plat- suffix) or along side the corresponding mach-* source.
907 source "arch/arm/mach-mvebu/Kconfig"
909 source "arch/arm/mach-at91/Kconfig"
911 source "arch/arm/mach-bcm/Kconfig"
913 source "arch/arm/mach-bcm2835/Kconfig"
915 source "arch/arm/mach-clps711x/Kconfig"
917 source "arch/arm/mach-cns3xxx/Kconfig"
919 source "arch/arm/mach-davinci/Kconfig"
921 source "arch/arm/mach-dove/Kconfig"
923 source "arch/arm/mach-ep93xx/Kconfig"
925 source "arch/arm/mach-footbridge/Kconfig"
927 source "arch/arm/mach-gemini/Kconfig"
929 source "arch/arm/mach-highbank/Kconfig"
931 source "arch/arm/mach-integrator/Kconfig"
933 source "arch/arm/mach-iop32x/Kconfig"
935 source "arch/arm/mach-iop33x/Kconfig"
937 source "arch/arm/mach-iop13xx/Kconfig"
939 source "arch/arm/mach-ixp4xx/Kconfig"
941 source "arch/arm/mach-keystone/Kconfig"
943 source "arch/arm/mach-kirkwood/Kconfig"
945 source "arch/arm/mach-ks8695/Kconfig"
947 source "arch/arm/mach-msm/Kconfig"
949 source "arch/arm/mach-mv78xx0/Kconfig"
951 source "arch/arm/mach-imx/Kconfig"
953 source "arch/arm/mach-mxs/Kconfig"
955 source "arch/arm/mach-netx/Kconfig"
957 source "arch/arm/mach-nomadik/Kconfig"
959 source "arch/arm/mach-nspire/Kconfig"
961 source "arch/arm/plat-omap/Kconfig"
963 source "arch/arm/mach-omap1/Kconfig"
965 source "arch/arm/mach-omap2/Kconfig"
967 source "arch/arm/mach-orion5x/Kconfig"
969 source "arch/arm/mach-picoxcell/Kconfig"
971 source "arch/arm/mach-pxa/Kconfig"
972 source "arch/arm/plat-pxa/Kconfig"
974 source "arch/arm/mach-mmp/Kconfig"
976 source "arch/arm/mach-realview/Kconfig"
978 source "arch/arm/mach-rockchip/Kconfig"
980 source "arch/arm/mach-sa1100/Kconfig"
982 source "arch/arm/plat-samsung/Kconfig"
984 source "arch/arm/mach-socfpga/Kconfig"
986 source "arch/arm/mach-spear/Kconfig"
988 source "arch/arm/mach-sti/Kconfig"
990 source "arch/arm/mach-s3c24xx/Kconfig"
992 source "arch/arm/mach-s3c64xx/Kconfig"
994 source "arch/arm/mach-s5p64x0/Kconfig"
996 source "arch/arm/mach-s5pc100/Kconfig"
998 source "arch/arm/mach-s5pv210/Kconfig"
1000 source "arch/arm/mach-exynos/Kconfig"
1002 source "arch/arm/mach-shmobile/Kconfig"
1004 source "arch/arm/mach-sunxi/Kconfig"
1006 source "arch/arm/mach-prima2/Kconfig"
1008 source "arch/arm/mach-tegra/Kconfig"
1010 source "arch/arm/mach-u300/Kconfig"
1012 source "arch/arm/mach-ux500/Kconfig"
1014 source "arch/arm/mach-versatile/Kconfig"
1016 source "arch/arm/mach-vexpress/Kconfig"
1017 source "arch/arm/plat-versatile/Kconfig"
1019 source "arch/arm/mach-virt/Kconfig"
1021 source "arch/arm/mach-vt8500/Kconfig"
1023 source "arch/arm/mach-w90x900/Kconfig"
1025 source "arch/arm/mach-zynq/Kconfig"
1027 # Definitions to make life easier
1033 select GENERIC_CLOCKEVENTS
1039 select GENERIC_IRQ_CHIP
1042 config PLAT_ORION_LEGACY
1049 config PLAT_VERSATILE
1052 config ARM_TIMER_SP804
1055 select CLKSRC_OF if OF
1057 source arch/arm/mm/Kconfig
1061 default 16 if ARCH_EP93XX
1065 bool "Enable iWMMXt support" if !CPU_PJ4
1066 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1067 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
1069 Enable support for iWMMXt context switching at run time if
1070 running on a CPU that supports it.
1072 config MULTI_IRQ_HANDLER
1075 Allow each machine to specify it's own IRQ handler at run time.
1078 source "arch/arm/Kconfig-nommu"
1081 config PJ4B_ERRATA_4742
1082 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
1083 depends on CPU_PJ4B && MACH_ARMADA_370
1086 When coming out of either a Wait for Interrupt (WFI) or a Wait for
1087 Event (WFE) IDLE states, a specific timing sensitivity exists between
1088 the retiring WFI/WFE instructions and the newly issued subsequent
1089 instructions. This sensitivity can result in a CPU hang scenario.
1091 The software must insert either a Data Synchronization Barrier (DSB)
1092 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
1095 config ARM_ERRATA_326103
1096 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1099 Executing a SWP instruction to read-only memory does not set bit 11
1100 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1101 treat the access as a read, preventing a COW from occurring and
1102 causing the faulting task to livelock.
1104 config ARM_ERRATA_411920
1105 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1106 depends on CPU_V6 || CPU_V6K
1108 Invalidation of the Instruction Cache operation can
1109 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1110 It does not affect the MPCore. This option enables the ARM Ltd.
1111 recommended workaround.
1113 config ARM_ERRATA_430973
1114 bool "ARM errata: Stale prediction on replaced interworking branch"
1117 This option enables the workaround for the 430973 Cortex-A8
1118 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1119 interworking branch is replaced with another code sequence at the
1120 same virtual address, whether due to self-modifying code or virtual
1121 to physical address re-mapping, Cortex-A8 does not recover from the
1122 stale interworking branch prediction. This results in Cortex-A8
1123 executing the new code sequence in the incorrect ARM or Thumb state.
1124 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1125 and also flushes the branch target cache at every context switch.
1126 Note that setting specific bits in the ACTLR register may not be
1127 available in non-secure mode.
1129 config ARM_ERRATA_458693
1130 bool "ARM errata: Processor deadlock when a false hazard is created"
1132 depends on !ARCH_MULTIPLATFORM
1134 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1135 erratum. For very specific sequences of memory operations, it is
1136 possible for a hazard condition intended for a cache line to instead
1137 be incorrectly associated with a different cache line. This false
1138 hazard might then cause a processor deadlock. The workaround enables
1139 the L1 caching of the NEON accesses and disables the PLD instruction
1140 in the ACTLR register. Note that setting specific bits in the ACTLR
1141 register may not be available in non-secure mode.
1143 config ARM_ERRATA_460075
1144 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1146 depends on !ARCH_MULTIPLATFORM
1148 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1149 erratum. Any asynchronous access to the L2 cache may encounter a
1150 situation in which recent store transactions to the L2 cache are lost
1151 and overwritten with stale memory contents from external memory. The
1152 workaround disables the write-allocate mode for the L2 cache via the
1153 ACTLR register. Note that setting specific bits in the ACTLR register
1154 may not be available in non-secure mode.
1156 config ARM_ERRATA_742230
1157 bool "ARM errata: DMB operation may be faulty"
1158 depends on CPU_V7 && SMP
1159 depends on !ARCH_MULTIPLATFORM
1161 This option enables the workaround for the 742230 Cortex-A9
1162 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1163 between two write operations may not ensure the correct visibility
1164 ordering of the two writes. This workaround sets a specific bit in
1165 the diagnostic register of the Cortex-A9 which causes the DMB
1166 instruction to behave as a DSB, ensuring the correct behaviour of
1169 config ARM_ERRATA_742231
1170 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1171 depends on CPU_V7 && SMP
1172 depends on !ARCH_MULTIPLATFORM
1174 This option enables the workaround for the 742231 Cortex-A9
1175 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1176 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1177 accessing some data located in the same cache line, may get corrupted
1178 data due to bad handling of the address hazard when the line gets
1179 replaced from one of the CPUs at the same time as another CPU is
1180 accessing it. This workaround sets specific bits in the diagnostic
1181 register of the Cortex-A9 which reduces the linefill issuing
1182 capabilities of the processor.
1184 config PL310_ERRATA_588369
1185 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1186 depends on CACHE_L2X0
1188 The PL310 L2 cache controller implements three types of Clean &
1189 Invalidate maintenance operations: by Physical Address
1190 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1191 They are architecturally defined to behave as the execution of a
1192 clean operation followed immediately by an invalidate operation,
1193 both performing to the same memory location. This functionality
1194 is not correctly implemented in PL310 as clean lines are not
1195 invalidated as a result of these operations.
1197 config ARM_ERRATA_643719
1198 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1199 depends on CPU_V7 && SMP
1201 This option enables the workaround for the 643719 Cortex-A9 (prior to
1202 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1203 register returns zero when it should return one. The workaround
1204 corrects this value, ensuring cache maintenance operations which use
1205 it behave as intended and avoiding data corruption.
1207 config ARM_ERRATA_720789
1208 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1211 This option enables the workaround for the 720789 Cortex-A9 (prior to
1212 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1213 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1214 As a consequence of this erratum, some TLB entries which should be
1215 invalidated are not, resulting in an incoherency in the system page
1216 tables. The workaround changes the TLB flushing routines to invalidate
1217 entries regardless of the ASID.
1219 config PL310_ERRATA_727915
1220 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1221 depends on CACHE_L2X0
1223 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1224 operation (offset 0x7FC). This operation runs in background so that
1225 PL310 can handle normal accesses while it is in progress. Under very
1226 rare circumstances, due to this erratum, write data can be lost when
1227 PL310 treats a cacheable write transaction during a Clean &
1228 Invalidate by Way operation.
1230 config ARM_ERRATA_743622
1231 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1233 depends on !ARCH_MULTIPLATFORM
1235 This option enables the workaround for the 743622 Cortex-A9
1236 (r2p*) erratum. Under very rare conditions, a faulty
1237 optimisation in the Cortex-A9 Store Buffer may lead to data
1238 corruption. This workaround sets a specific bit in the diagnostic
1239 register of the Cortex-A9 which disables the Store Buffer
1240 optimisation, preventing the defect from occurring. This has no
1241 visible impact on the overall performance or power consumption of the
1244 config ARM_ERRATA_751472
1245 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1247 depends on !ARCH_MULTIPLATFORM
1249 This option enables the workaround for the 751472 Cortex-A9 (prior
1250 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1251 completion of a following broadcasted operation if the second
1252 operation is received by a CPU before the ICIALLUIS has completed,
1253 potentially leading to corrupted entries in the cache or TLB.
1255 config PL310_ERRATA_753970
1256 bool "PL310 errata: cache sync operation may be faulty"
1257 depends on CACHE_PL310
1259 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1261 Under some condition the effect of cache sync operation on
1262 the store buffer still remains when the operation completes.
1263 This means that the store buffer is always asked to drain and
1264 this prevents it from merging any further writes. The workaround
1265 is to replace the normal offset of cache sync operation (0x730)
1266 by another offset targeting an unmapped PL310 register 0x740.
1267 This has the same effect as the cache sync operation: store buffer
1268 drain and waiting for all buffers empty.
1270 config ARM_ERRATA_754322
1271 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1274 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1275 r3p*) erratum. A speculative memory access may cause a page table walk
1276 which starts prior to an ASID switch but completes afterwards. This
1277 can populate the micro-TLB with a stale entry which may be hit with
1278 the new ASID. This workaround places two dsb instructions in the mm
1279 switching code so that no page table walks can cross the ASID switch.
1281 config ARM_ERRATA_754327
1282 bool "ARM errata: no automatic Store Buffer drain"
1283 depends on CPU_V7 && SMP
1285 This option enables the workaround for the 754327 Cortex-A9 (prior to
1286 r2p0) erratum. The Store Buffer does not have any automatic draining
1287 mechanism and therefore a livelock may occur if an external agent
1288 continuously polls a memory location waiting to observe an update.
1289 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1290 written polling loops from denying visibility of updates to memory.
1292 config ARM_ERRATA_364296
1293 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1296 This options enables the workaround for the 364296 ARM1136
1297 r0p2 erratum (possible cache data corruption with
1298 hit-under-miss enabled). It sets the undocumented bit 31 in
1299 the auxiliary control register and the FI bit in the control
1300 register, thus disabling hit-under-miss without putting the
1301 processor into full low interrupt latency mode. ARM11MPCore
1304 config ARM_ERRATA_764369
1305 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1306 depends on CPU_V7 && SMP
1308 This option enables the workaround for erratum 764369
1309 affecting Cortex-A9 MPCore with two or more processors (all
1310 current revisions). Under certain timing circumstances, a data
1311 cache line maintenance operation by MVA targeting an Inner
1312 Shareable memory region may fail to proceed up to either the
1313 Point of Coherency or to the Point of Unification of the
1314 system. This workaround adds a DSB instruction before the
1315 relevant cache maintenance functions and sets a specific bit
1316 in the diagnostic control register of the SCU.
1318 config PL310_ERRATA_769419
1319 bool "PL310 errata: no automatic Store Buffer drain"
1320 depends on CACHE_L2X0
1322 On revisions of the PL310 prior to r3p2, the Store Buffer does
1323 not automatically drain. This can cause normal, non-cacheable
1324 writes to be retained when the memory system is idle, leading
1325 to suboptimal I/O performance for drivers using coherent DMA.
1326 This option adds a write barrier to the cpu_idle loop so that,
1327 on systems with an outer cache, the store buffer is drained
1330 config ARM_ERRATA_775420
1331 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1334 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1335 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1336 operation aborts with MMU exception, it might cause the processor
1337 to deadlock. This workaround puts DSB before executing ISB if
1338 an abort may occur on cache maintenance.
1340 config ARM_ERRATA_798181
1341 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1342 depends on CPU_V7 && SMP
1344 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1345 adequately shooting down all use of the old entries. This
1346 option enables the Linux kernel workaround for this erratum
1347 which sends an IPI to the CPUs that are running the same ASID
1348 as the one being invalidated.
1350 config ARM_ERRATA_773022
1351 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1354 This option enables the workaround for the 773022 Cortex-A15
1355 (up to r0p4) erratum. In certain rare sequences of code, the
1356 loop buffer may deliver incorrect instructions. This
1357 workaround disables the loop buffer to avoid the erratum.
1361 source "arch/arm/common/Kconfig"
1371 Find out whether you have ISA slots on your motherboard. ISA is the
1372 name of a bus system, i.e. the way the CPU talks to the other stuff
1373 inside your box. Other bus systems are PCI, EISA, MicroChannel
1374 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1375 newer boards don't support it. If you have ISA, say Y, otherwise N.
1377 # Select ISA DMA controller support
1382 # Select ISA DMA interface
1387 bool "PCI support" if MIGHT_HAVE_PCI
1389 Find out whether you have a PCI motherboard. PCI is the name of a
1390 bus system, i.e. the way the CPU talks to the other stuff inside
1391 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1392 VESA. If you have PCI, say Y, otherwise N.
1398 config PCI_NANOENGINE
1399 bool "BSE nanoEngine PCI support"
1400 depends on SA1100_NANOENGINE
1402 Enable PCI on the BSE nanoEngine board.
1407 config PCI_HOST_ITE8152
1409 depends on PCI && MACH_ARMCORE
1413 source "drivers/pci/Kconfig"
1414 source "drivers/pci/pcie/Kconfig"
1416 source "drivers/pcmcia/Kconfig"
1420 menu "Kernel Features"
1425 This option should be selected by machines which have an SMP-
1428 The only effect of this option is to make the SMP-related
1429 options available to the user for configuration.
1432 bool "Symmetric Multi-Processing"
1433 depends on CPU_V6K || CPU_V7
1434 depends on GENERIC_CLOCKEVENTS
1436 depends on MMU || ARM_MPU
1438 This enables support for systems with more than one CPU. If you have
1439 a system with only one CPU, like most personal computers, say N. If
1440 you have a system with more than one CPU, say Y.
1442 If you say N here, the kernel will run on single and multiprocessor
1443 machines, but will use only one CPU of a multiprocessor machine. If
1444 you say Y here, the kernel will run on many, but not all, single
1445 processor machines. On a single processor machine, the kernel will
1446 run faster if you say N here.
1448 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1449 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1450 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1452 If you don't know what to do here, say N.
1455 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1456 depends on SMP && !XIP_KERNEL && MMU
1459 SMP kernels contain instructions which fail on non-SMP processors.
1460 Enabling this option allows the kernel to modify itself to make
1461 these instructions safe. Disabling it allows about 1K of space
1464 If you don't know what to do here, say Y.
1466 config ARM_CPU_TOPOLOGY
1467 bool "Support cpu topology definition"
1468 depends on SMP && CPU_V7
1471 Support ARM cpu topology definition. The MPIDR register defines
1472 affinity between processors which is then used to describe the cpu
1473 topology of an ARM System.
1476 bool "Multi-core scheduler support"
1477 depends on ARM_CPU_TOPOLOGY
1479 Multi-core scheduler support improves the CPU scheduler's decision
1480 making when dealing with multi-core CPU chips at a cost of slightly
1481 increased overhead in some places. If unsure say N here.
1484 bool "SMT scheduler support"
1485 depends on ARM_CPU_TOPOLOGY
1487 Improves the CPU scheduler's decision making when dealing with
1488 MultiThreading at a cost of slightly increased overhead in some
1489 places. If unsure say N here.
1494 This option enables support for the ARM system coherency unit
1496 config HAVE_ARM_ARCH_TIMER
1497 bool "Architected timer support"
1499 select ARM_ARCH_TIMER
1500 select GENERIC_CLOCKEVENTS
1502 This option enables support for the ARM architected timer
1507 select CLKSRC_OF if OF
1509 This options enables support for the ARM timer and watchdog unit
1512 bool "Multi-Cluster Power Management"
1513 depends on CPU_V7 && SMP
1515 This option provides the common power management infrastructure
1516 for (multi-)cluster based systems, such as big.LITTLE based
1520 bool "big.LITTLE support (Experimental)"
1521 depends on CPU_V7 && SMP
1524 This option enables support selections for the big.LITTLE
1525 system architecture.
1528 bool "big.LITTLE switcher support"
1529 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
1531 select ARM_CPU_SUSPEND
1533 The big.LITTLE "switcher" provides the core functionality to
1534 transparently handle transition between a cluster of A15's
1535 and a cluster of A7's in a big.LITTLE system.
1537 config BL_SWITCHER_DUMMY_IF
1538 tristate "Simple big.LITTLE switcher user interface"
1539 depends on BL_SWITCHER && DEBUG_KERNEL
1541 This is a simple and dummy char dev interface to control
1542 the big.LITTLE switcher core code. It is meant for
1543 debugging purposes only.
1546 prompt "Memory split"
1549 Select the desired split between kernel and user memory.
1551 If you are not absolutely sure what you are doing, leave this
1555 bool "3G/1G user/kernel split"
1557 bool "2G/2G user/kernel split"
1559 bool "1G/3G user/kernel split"
1564 default 0x40000000 if VMSPLIT_1G
1565 default 0x80000000 if VMSPLIT_2G
1569 int "Maximum number of CPUs (2-32)"
1575 bool "Support for hot-pluggable CPUs"
1578 Say Y here to experiment with turning CPUs off and on. CPUs
1579 can be controlled through /sys/devices/system/cpu.
1582 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1585 Say Y here if you want Linux to communicate with system firmware
1586 implementing the PSCI specification for CPU-centric power
1587 management operations described in ARM document number ARM DEN
1588 0022A ("Power State Coordination Interface System Software on
1591 # The GPIO number here must be sorted by descending number. In case of
1592 # a multiplatform kernel, we just want the highest value required by the
1593 # selected platforms.
1596 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1597 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || SOC_DRA7XX
1598 default 392 if ARCH_U8500
1599 default 352 if ARCH_VT8500
1600 default 288 if ARCH_SUNXI
1601 default 264 if MACH_H4700
1604 Maximum number of GPIOs in the system.
1606 If unsure, leave the default value.
1608 source kernel/Kconfig.preempt
1612 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1613 ARCH_S5PV210 || ARCH_EXYNOS4
1614 default AT91_TIMER_HZ if ARCH_AT91
1615 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1619 depends on HZ_FIXED = 0
1620 prompt "Timer frequency"
1644 default HZ_FIXED if HZ_FIXED != 0
1645 default 100 if HZ_100
1646 default 200 if HZ_200
1647 default 250 if HZ_250
1648 default 300 if HZ_300
1649 default 500 if HZ_500
1653 def_bool HIGH_RES_TIMERS
1656 def_bool HIGH_RES_TIMERS
1658 config THUMB2_KERNEL
1659 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1660 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1661 default y if CPU_THUMBONLY
1663 select ARM_ASM_UNIFIED
1666 By enabling this option, the kernel will be compiled in
1667 Thumb-2 mode. A compiler/assembler that understand the unified
1668 ARM-Thumb syntax is needed.
1672 config THUMB2_AVOID_R_ARM_THM_JUMP11
1673 bool "Work around buggy Thumb-2 short branch relocations in gas"
1674 depends on THUMB2_KERNEL && MODULES
1677 Various binutils versions can resolve Thumb-2 branches to
1678 locally-defined, preemptible global symbols as short-range "b.n"
1679 branch instructions.
1681 This is a problem, because there's no guarantee the final
1682 destination of the symbol, or any candidate locations for a
1683 trampoline, are within range of the branch. For this reason, the
1684 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1685 relocation in modules at all, and it makes little sense to add
1688 The symptom is that the kernel fails with an "unsupported
1689 relocation" error when loading some modules.
1691 Until fixed tools are available, passing
1692 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1693 code which hits this problem, at the cost of a bit of extra runtime
1694 stack usage in some cases.
1696 The problem is described in more detail at:
1697 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1699 Only Thumb-2 kernels are affected.
1701 Unless you are sure your tools don't have this problem, say Y.
1703 config ARM_ASM_UNIFIED
1707 bool "Use the ARM EABI to compile the kernel"
1709 This option allows for the kernel to be compiled using the latest
1710 ARM ABI (aka EABI). This is only useful if you are using a user
1711 space environment that is also compiled with EABI.
1713 Since there are major incompatibilities between the legacy ABI and
1714 EABI, especially with regard to structure member alignment, this
1715 option also changes the kernel syscall calling convention to
1716 disambiguate both ABIs and allow for backward compatibility support
1717 (selected with CONFIG_OABI_COMPAT).
1719 To use this you need GCC version 4.0.0 or later.
1722 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1723 depends on AEABI && !THUMB2_KERNEL
1725 This option preserves the old syscall interface along with the
1726 new (ARM EABI) one. It also provides a compatibility layer to
1727 intercept syscalls that have structure arguments which layout
1728 in memory differs between the legacy ABI and the new ARM EABI
1729 (only for non "thumb" binaries). This option adds a tiny
1730 overhead to all syscalls and produces a slightly larger kernel.
1732 The seccomp filter system will not be available when this is
1733 selected, since there is no way yet to sensibly distinguish
1734 between calling conventions during filtering.
1736 If you know you'll be using only pure EABI user space then you
1737 can say N here. If this option is not selected and you attempt
1738 to execute a legacy ABI binary then the result will be
1739 UNPREDICTABLE (in fact it can be predicted that it won't work
1740 at all). If in doubt say N.
1742 config ARCH_HAS_HOLES_MEMORYMODEL
1745 config ARCH_SPARSEMEM_ENABLE
1748 config ARCH_SPARSEMEM_DEFAULT
1749 def_bool ARCH_SPARSEMEM_ENABLE
1751 config ARCH_SELECT_MEMORY_MODEL
1752 def_bool ARCH_SPARSEMEM_ENABLE
1754 config HAVE_ARCH_PFN_VALID
1755 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1758 bool "High Memory Support"
1761 The address space of ARM processors is only 4 Gigabytes large
1762 and it has to accommodate user address space, kernel address
1763 space as well as some memory mapped IO. That means that, if you
1764 have a large amount of physical memory and/or IO, not all of the
1765 memory can be "permanently mapped" by the kernel. The physical
1766 memory that is not permanently mapped is called "high memory".
1768 Depending on the selected kernel/user memory split, minimum
1769 vmalloc space and actual amount of RAM, you may not need this
1770 option which should result in a slightly faster kernel.
1775 bool "Allocate 2nd-level pagetables from highmem"
1778 config HW_PERF_EVENTS
1779 bool "Enable hardware performance counter support for perf events"
1780 depends on PERF_EVENTS
1783 Enable hardware performance counter support for perf events. If
1784 disabled, perf events will use software events only.
1786 config SYS_SUPPORTS_HUGETLBFS
1790 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1794 config ARCH_WANT_GENERAL_HUGETLB
1799 config FORCE_MAX_ZONEORDER
1800 int "Maximum zone order" if ARCH_SHMOBILE
1801 range 11 64 if ARCH_SHMOBILE
1802 default "12" if SOC_AM33XX
1803 default "9" if SA1111
1806 The kernel memory allocator divides physically contiguous memory
1807 blocks into "zones", where each zone is a power of two number of
1808 pages. This option selects the largest power of two that the kernel
1809 keeps in the memory allocator. If you need to allocate very large
1810 blocks of physically contiguous memory, then you may need to
1811 increase this value.
1813 This config option is actually maximum order plus one. For example,
1814 a value of 11 means that the largest free memory block is 2^10 pages.
1816 config ALIGNMENT_TRAP
1818 depends on CPU_CP15_MMU
1819 default y if !ARCH_EBSA110
1820 select HAVE_PROC_CPU if PROC_FS
1822 ARM processors cannot fetch/store information which is not
1823 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1824 address divisible by 4. On 32-bit ARM processors, these non-aligned
1825 fetch/store instructions will be emulated in software if you say
1826 here, which has a severe performance impact. This is necessary for
1827 correct operation of some network protocols. With an IP-only
1828 configuration it is safe to say N, otherwise say Y.
1830 config UACCESS_WITH_MEMCPY
1831 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1833 default y if CPU_FEROCEON
1835 Implement faster copy_to_user and clear_user methods for CPU
1836 cores where a 8-word STM instruction give significantly higher
1837 memory write throughput than a sequence of individual 32bit stores.
1839 A possible side effect is a slight increase in scheduling latency
1840 between threads sharing the same address space if they invoke
1841 such copy operations with large buffers.
1843 However, if the CPU data cache is using a write-allocate mode,
1844 this option is unlikely to provide any performance gain.
1848 prompt "Enable seccomp to safely compute untrusted bytecode"
1850 This kernel feature is useful for number crunching applications
1851 that may need to compute untrusted bytecode during their
1852 execution. By using pipes or other transports made available to
1853 the process as file descriptors supporting the read/write
1854 syscalls, it's possible to isolate those applications in
1855 their own address space using seccomp. Once seccomp is
1856 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1857 and the task is only allowed to execute a few safe syscalls
1858 defined by each seccomp mode.
1860 config CC_STACKPROTECTOR
1861 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1863 This option turns on the -fstack-protector GCC feature. This
1864 feature puts, at the beginning of functions, a canary value on
1865 the stack just before the return address, and validates
1866 the value just before actually returning. Stack based buffer
1867 overflows (that need to overwrite this return address) now also
1868 overwrite the canary, which gets detected and the attack is then
1869 neutralized via a kernel panic.
1870 This feature requires gcc version 4.2 or above.
1883 bool "Xen guest support on ARM (EXPERIMENTAL)"
1884 depends on ARM && AEABI && OF
1885 depends on CPU_V7 && !CPU_V6
1886 depends on !GENERIC_ATOMIC64
1890 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1897 bool "Flattened Device Tree support"
1900 select OF_EARLY_FLATTREE
1902 Include support for flattened device tree machine descriptions.
1905 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1908 This is the traditional way of passing data to the kernel at boot
1909 time. If you are solely relying on the flattened device tree (or
1910 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1911 to remove ATAGS support from your kernel binary. If unsure,
1914 config DEPRECATED_PARAM_STRUCT
1915 bool "Provide old way to pass kernel parameters"
1918 This was deprecated in 2001 and announced to live on for 5 years.
1919 Some old boot loaders still use this way.
1921 # Compressed boot loader in ROM. Yes, we really want to ask about
1922 # TEXT and BSS so we preserve their values in the config files.
1923 config ZBOOT_ROM_TEXT
1924 hex "Compressed ROM boot loader base address"
1927 The physical address at which the ROM-able zImage is to be
1928 placed in the target. Platforms which normally make use of
1929 ROM-able zImage formats normally set this to a suitable
1930 value in their defconfig file.
1932 If ZBOOT_ROM is not enabled, this has no effect.
1934 config ZBOOT_ROM_BSS
1935 hex "Compressed ROM boot loader BSS address"
1938 The base address of an area of read/write memory in the target
1939 for the ROM-able zImage which must be available while the
1940 decompressor is running. It must be large enough to hold the
1941 entire decompressed kernel plus an additional 128 KiB.
1942 Platforms which normally make use of ROM-able zImage formats
1943 normally set this to a suitable value in their defconfig file.
1945 If ZBOOT_ROM is not enabled, this has no effect.
1948 bool "Compressed boot loader in ROM/flash"
1949 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1951 Say Y here if you intend to execute your compressed kernel image
1952 (zImage) directly from ROM or flash. If unsure, say N.
1955 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1956 depends on ZBOOT_ROM && ARCH_SH7372
1957 default ZBOOT_ROM_NONE
1959 Include experimental SD/MMC loading code in the ROM-able zImage.
1960 With this enabled it is possible to write the ROM-able zImage
1961 kernel image to an MMC or SD card and boot the kernel straight
1962 from the reset vector. At reset the processor Mask ROM will load
1963 the first part of the ROM-able zImage which in turn loads the
1964 rest the kernel image to RAM.
1966 config ZBOOT_ROM_NONE
1967 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1969 Do not load image from SD or MMC
1971 config ZBOOT_ROM_MMCIF
1972 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1974 Load image from MMCIF hardware block.
1976 config ZBOOT_ROM_SH_MOBILE_SDHI
1977 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1979 Load image from SDHI hardware block
1983 config ARM_APPENDED_DTB
1984 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1985 depends on OF && !ZBOOT_ROM
1987 With this option, the boot code will look for a device tree binary
1988 (DTB) appended to zImage
1989 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1991 This is meant as a backward compatibility convenience for those
1992 systems with a bootloader that can't be upgraded to accommodate
1993 the documented boot protocol using a device tree.
1995 Beware that there is very little in terms of protection against
1996 this option being confused by leftover garbage in memory that might
1997 look like a DTB header after a reboot if no actual DTB is appended
1998 to zImage. Do not leave this option active in a production kernel
1999 if you don't intend to always append a DTB. Proper passing of the
2000 location into r2 of a bootloader provided DTB is always preferable
2003 config ARM_ATAG_DTB_COMPAT
2004 bool "Supplement the appended DTB with traditional ATAG information"
2005 depends on ARM_APPENDED_DTB
2007 Some old bootloaders can't be updated to a DTB capable one, yet
2008 they provide ATAGs with memory configuration, the ramdisk address,
2009 the kernel cmdline string, etc. Such information is dynamically
2010 provided by the bootloader and can't always be stored in a static
2011 DTB. To allow a device tree enabled kernel to be used with such
2012 bootloaders, this option allows zImage to extract the information
2013 from the ATAG list and store it at run time into the appended DTB.
2016 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
2017 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2019 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
2020 bool "Use bootloader kernel arguments if available"
2022 Uses the command-line options passed by the boot loader instead of
2023 the device tree bootargs property. If the boot loader doesn't provide
2024 any, the device tree bootargs property will be used.
2026 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
2027 bool "Extend with bootloader kernel arguments"
2029 The command-line arguments provided by the boot loader will be
2030 appended to the the device tree bootargs property.
2035 string "Default kernel command string"
2038 On some architectures (EBSA110 and CATS), there is currently no way
2039 for the boot loader to pass arguments to the kernel. For these
2040 architectures, you should supply some command-line options at build
2041 time by entering them here. As a minimum, you should specify the
2042 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2045 prompt "Kernel command line type" if CMDLINE != ""
2046 default CMDLINE_FROM_BOOTLOADER
2049 config CMDLINE_FROM_BOOTLOADER
2050 bool "Use bootloader kernel arguments if available"
2052 Uses the command-line options passed by the boot loader. If
2053 the boot loader doesn't provide any, the default kernel command
2054 string provided in CMDLINE will be used.
2056 config CMDLINE_EXTEND
2057 bool "Extend bootloader kernel arguments"
2059 The command-line arguments provided by the boot loader will be
2060 appended to the default kernel command string.
2062 config CMDLINE_FORCE
2063 bool "Always use the default kernel command string"
2065 Always use the default kernel command string, even if the boot
2066 loader passes other arguments to the kernel.
2067 This is useful if you cannot or don't want to change the
2068 command-line options your boot loader passes to the kernel.
2072 bool "Kernel Execute-In-Place from ROM"
2073 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2075 Execute-In-Place allows the kernel to run from non-volatile storage
2076 directly addressable by the CPU, such as NOR flash. This saves RAM
2077 space since the text section of the kernel is not loaded from flash
2078 to RAM. Read-write sections, such as the data section and stack,
2079 are still copied to RAM. The XIP kernel is not compressed since
2080 it has to run directly from flash, so it will take more space to
2081 store it. The flash address used to link the kernel object files,
2082 and for storing it, is configuration dependent. Therefore, if you
2083 say Y here, you must know the proper physical address where to
2084 store the kernel image depending on your own flash memory usage.
2086 Also note that the make target becomes "make xipImage" rather than
2087 "make zImage" or "make Image". The final kernel binary to put in
2088 ROM memory will be arch/arm/boot/xipImage.
2092 config XIP_PHYS_ADDR
2093 hex "XIP Kernel Physical Location"
2094 depends on XIP_KERNEL
2095 default "0x00080000"
2097 This is the physical address in your flash memory the kernel will
2098 be linked for and stored to. This address is dependent on your
2102 bool "Kexec system call (EXPERIMENTAL)"
2103 depends on (!SMP || PM_SLEEP_SMP)
2105 kexec is a system call that implements the ability to shutdown your
2106 current kernel, and to start another kernel. It is like a reboot
2107 but it is independent of the system firmware. And like a reboot
2108 you can start any kernel with it, not just Linux.
2110 It is an ongoing process to be certain the hardware in a machine
2111 is properly shutdown, so do not be surprised if this code does not
2112 initially work for you.
2115 bool "Export atags in procfs"
2116 depends on ATAGS && KEXEC
2119 Should the atags used to boot the kernel be exported in an "atags"
2120 file in procfs. Useful with kexec.
2123 bool "Build kdump crash kernel (EXPERIMENTAL)"
2125 Generate crash dump after being started by kexec. This should
2126 be normally only set in special crash dump kernels which are
2127 loaded in the main kernel with kexec-tools into a specially
2128 reserved region and then later executed after a crash by
2129 kdump/kexec. The crash dump kernel must be compiled to a
2130 memory address not used by the main kernel
2132 For more details see Documentation/kdump/kdump.txt
2134 config AUTO_ZRELADDR
2135 bool "Auto calculation of the decompressed kernel image address"
2136 depends on !ZBOOT_ROM
2138 ZRELADDR is the physical address where the decompressed kernel
2139 image will be placed. If AUTO_ZRELADDR is selected, the address
2140 will be determined at run-time by masking the current IP with
2141 0xf8000000. This assumes the zImage being placed in the first 128MB
2142 from start of memory.
2146 menu "CPU Power Management"
2149 source "drivers/cpufreq/Kconfig"
2152 source "drivers/cpuidle/Kconfig"
2156 menu "Floating point emulation"
2158 comment "At least one emulation must be selected"
2161 bool "NWFPE math emulation"
2162 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2164 Say Y to include the NWFPE floating point emulator in the kernel.
2165 This is necessary to run most binaries. Linux does not currently
2166 support floating point hardware so you need to say Y here even if
2167 your machine has an FPA or floating point co-processor podule.
2169 You may say N here if you are going to load the Acorn FPEmulator
2170 early in the bootup.
2173 bool "Support extended precision"
2174 depends on FPE_NWFPE
2176 Say Y to include 80-bit support in the kernel floating-point
2177 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2178 Note that gcc does not generate 80-bit operations by default,
2179 so in most cases this option only enlarges the size of the
2180 floating point emulator without any good reason.
2182 You almost surely want to say N here.
2185 bool "FastFPE math emulation (EXPERIMENTAL)"
2186 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2188 Say Y here to include the FAST floating point emulator in the kernel.
2189 This is an experimental much faster emulator which now also has full
2190 precision for the mantissa. It does not support any exceptions.
2191 It is very simple, and approximately 3-6 times faster than NWFPE.
2193 It should be sufficient for most programs. It may be not suitable
2194 for scientific calculations, but you have to check this for yourself.
2195 If you do not feel you need a faster FP emulation you should better
2199 bool "VFP-format floating point maths"
2200 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2202 Say Y to include VFP support code in the kernel. This is needed
2203 if your hardware includes a VFP unit.
2205 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2206 release notes and additional status information.
2208 Say N if your target does not have VFP hardware.
2216 bool "Advanced SIMD (NEON) Extension support"
2217 depends on VFPv3 && CPU_V7
2219 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2222 config KERNEL_MODE_NEON
2223 bool "Support for NEON in kernel mode"
2224 depends on NEON && AEABI
2226 Say Y to include support for NEON in kernel mode.
2230 menu "Userspace binary formats"
2232 source "fs/Kconfig.binfmt"
2235 tristate "RISC OS personality"
2238 Say Y here to include the kernel code necessary if you want to run
2239 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2240 experimental; if this sounds frightening, say N and sleep in peace.
2241 You can also say M here to compile this support as a module (which
2242 will be called arthur).
2246 menu "Power management options"
2248 source "kernel/power/Kconfig"
2250 config ARCH_SUSPEND_POSSIBLE
2251 depends on !ARCH_S5PC100
2252 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2253 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2256 config ARM_CPU_SUSPEND
2261 source "net/Kconfig"
2263 source "drivers/Kconfig"
2267 source "arch/arm/Kconfig.debug"
2269 source "security/Kconfig"
2271 source "crypto/Kconfig"
2273 source "lib/Kconfig"
2275 source "arch/arm/kvm/Kconfig"