4 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
5 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
6 select ARCH_HAVE_CUSTOM_GPIO_H
7 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
8 select ARCH_WANT_IPC_PARSE_VERSION
9 select BUILDTIME_EXTABLE_SORT if MMU
10 select CPU_PM if (SUSPEND || CPU_IDLE)
11 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
12 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
13 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
14 select GENERIC_IRQ_PROBE
15 select GENERIC_IRQ_SHOW
16 select GENERIC_PCI_IOMAP
17 select GENERIC_SMP_IDLE_THREAD
18 select GENERIC_IDLE_POLL_SETUP
19 select GENERIC_STRNCPY_FROM_USER
20 select GENERIC_STRNLEN_USER
21 select HARDIRQS_SW_RESEND
23 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
25 select HAVE_ARCH_SECCOMP_FILTER
26 select HAVE_ARCH_TRACEHOOK
28 select HAVE_C_RECORDMCOUNT
29 select HAVE_DEBUG_KMEMLEAK
30 select HAVE_DMA_API_DEBUG
32 select HAVE_DMA_CONTIGUOUS if MMU
33 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
34 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
35 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
36 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
37 select HAVE_GENERIC_DMA_COHERENT
38 select HAVE_GENERIC_HARDIRQS
39 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
40 select HAVE_IDE if PCI || ISA || PCMCIA
41 select HAVE_KERNEL_GZIP
42 select HAVE_KERNEL_LZMA
43 select HAVE_KERNEL_LZO
45 select HAVE_KPROBES if !XIP_KERNEL
46 select HAVE_KRETPROBES if (HAVE_KPROBES)
48 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
49 select HAVE_PERF_EVENTS
50 select HAVE_REGS_AND_STACK_ACCESS_API
51 select HAVE_SYSCALL_TRACEPOINTS
54 select PERF_USE_VMALLOC
56 select SYS_SUPPORTS_APM_EMULATION
57 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
58 select MODULES_USE_ELF_REL
59 select CLONE_BACKWARDS
60 select OLD_SIGSUSPEND3
62 select HAVE_CONTEXT_TRACKING
64 The ARM series is a line of low-power-consumption RISC chip designs
65 licensed by ARM Ltd and targeted at embedded applications and
66 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
67 manufactured, but legacy ARM-based PC hardware remains popular in
68 Europe. There is an ARM Linux project with a web page at
69 <http://www.arm.linux.org.uk/>.
71 config ARM_HAS_SG_CHAIN
74 config NEED_SG_DMA_LENGTH
77 config ARM_DMA_USE_IOMMU
79 select ARM_HAS_SG_CHAIN
80 select NEED_SG_DMA_LENGTH
84 config ARM_DMA_IOMMU_ALIGNMENT
85 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
89 DMA mapping framework by default aligns all buffers to the smallest
90 PAGE_SIZE order which is greater than or equal to the requested buffer
91 size. This works well for buffers up to a few hundreds kilobytes, but
92 for larger buffers it just a waste of address space. Drivers which has
93 relatively small addressing window (like 64Mib) might run out of
94 virtual space with just a few allocations.
96 With this parameter you can specify the maximum PAGE_SIZE order for
97 DMA IOMMU buffers. Larger buffers will be aligned only to this
98 specified order. The order is expressed as a power of two multiplied
106 config MIGHT_HAVE_PCI
109 config SYS_SUPPORTS_APM_EMULATION
117 select GENERIC_ALLOCATOR
128 The Extended Industry Standard Architecture (EISA) bus was
129 developed as an open alternative to the IBM MicroChannel bus.
131 The EISA bus provided some of the features of the IBM MicroChannel
132 bus while maintaining backward compatibility with cards made for
133 the older ISA bus. The EISA bus saw limited use between 1988 and
134 1995 when it was made obsolete by the PCI bus.
136 Say Y here if you are building a kernel for an EISA-based machine.
143 config STACKTRACE_SUPPORT
147 config HAVE_LATENCYTOP_SUPPORT
152 config LOCKDEP_SUPPORT
156 config TRACE_IRQFLAGS_SUPPORT
160 config RWSEM_GENERIC_SPINLOCK
164 config RWSEM_XCHGADD_ALGORITHM
167 config ARCH_HAS_ILOG2_U32
170 config ARCH_HAS_ILOG2_U64
173 config ARCH_HAS_CPUFREQ
176 Internal node to signify that the ARCH has CPUFREQ support
177 and that the relevant menu configurations are displayed for
180 config GENERIC_HWEIGHT
184 config GENERIC_CALIBRATE_DELAY
188 config ARCH_MAY_HAVE_PC_FDC
194 config NEED_DMA_MAP_STATE
197 config ARCH_HAS_DMA_SET_COHERENT_MASK
200 config GENERIC_ISA_DMA
206 config NEED_RET_TO_USER
214 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
215 default DRAM_BASE if REMAP_VECTORS_TO_RAM
218 The base address of exception vectors.
220 config ARM_PATCH_PHYS_VIRT
221 bool "Patch physical to virtual translations at runtime" if EMBEDDED
223 depends on !XIP_KERNEL && MMU
224 depends on !ARCH_REALVIEW || !SPARSEMEM
226 Patch phys-to-virt and virt-to-phys translation functions at
227 boot and module load time according to the position of the
228 kernel in system memory.
230 This can only be used with non-XIP MMU kernels where the base
231 of physical memory is at a 16MB boundary.
233 Only disable this option if you know that you do not require
234 this feature (eg, building a kernel for a single machine) and
235 you need to shrink the kernel to the minimal size.
237 config NEED_MACH_GPIO_H
240 Select this when mach/gpio.h is required to provide special
241 definitions for this platform. The need for mach/gpio.h should
242 be avoided when possible.
244 config NEED_MACH_IO_H
247 Select this when mach/io.h is required to provide special
248 definitions for this platform. The need for mach/io.h should
249 be avoided when possible.
251 config NEED_MACH_MEMORY_H
254 Select this when mach/memory.h is required to provide special
255 definitions for this platform. The need for mach/memory.h should
256 be avoided when possible.
259 hex "Physical address of main memory" if MMU
260 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
261 default DRAM_BASE if !MMU
263 Please provide the physical address corresponding to the
264 location of main memory in your system.
270 source "init/Kconfig"
272 source "kernel/Kconfig.freezer"
277 bool "MMU-based Paged Memory Management Support"
280 Select if you want MMU-based virtualised addressing space
281 support by paged memory management. If unsure, say 'Y'.
284 # The "ARM system type" choice list is ordered alphabetically by option
285 # text. Please add new entries in the option alphabetic order.
288 prompt "ARM system type"
289 default ARCH_VERSATILE if !MMU
290 default ARCH_MULTIPLATFORM if MMU
292 config ARCH_MULTIPLATFORM
293 bool "Allow multiple platforms to be selected"
295 select ARM_PATCH_PHYS_VIRT
298 select MULTI_IRQ_HANDLER
302 config ARCH_INTEGRATOR
303 bool "ARM Ltd. Integrator family"
304 select ARCH_HAS_CPUFREQ
307 select COMMON_CLK_VERSATILE
308 select GENERIC_CLOCKEVENTS
311 select MULTI_IRQ_HANDLER
312 select NEED_MACH_MEMORY_H
313 select PLAT_VERSATILE
315 select VERSATILE_FPGA_IRQ
317 Support for ARM's Integrator platform.
320 bool "ARM Ltd. RealView family"
321 select ARCH_WANT_OPTIONAL_GPIOLIB
323 select ARM_TIMER_SP804
325 select COMMON_CLK_VERSATILE
326 select GENERIC_CLOCKEVENTS
327 select GPIO_PL061 if GPIOLIB
329 select NEED_MACH_MEMORY_H
330 select PLAT_VERSATILE
331 select PLAT_VERSATILE_CLCD
333 This enables support for ARM Ltd RealView boards.
335 config ARCH_VERSATILE
336 bool "ARM Ltd. Versatile family"
337 select ARCH_WANT_OPTIONAL_GPIOLIB
339 select ARM_TIMER_SP804
342 select GENERIC_CLOCKEVENTS
343 select HAVE_MACH_CLKDEV
345 select PLAT_VERSATILE
346 select PLAT_VERSATILE_CLCD
347 select PLAT_VERSATILE_CLOCK
348 select VERSATILE_FPGA_IRQ
350 This enables support for ARM Ltd Versatile board.
354 select ARCH_REQUIRE_GPIOLIB
358 select NEED_MACH_GPIO_H
359 select NEED_MACH_IO_H if PCCARD
361 select PINCTRL_AT91 if USE_OF
363 This enables support for systems based on Atmel
364 AT91RM9200 and AT91SAM9* processors.
367 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
368 select ARCH_REQUIRE_GPIOLIB
373 select GENERIC_CLOCKEVENTS
374 select MULTI_IRQ_HANDLER
375 select NEED_MACH_MEMORY_H
378 Support for Cirrus Logic 711x/721x/731x based boards.
381 bool "Cortina Systems Gemini"
382 select ARCH_REQUIRE_GPIOLIB
383 select ARCH_USES_GETTIMEOFFSET
384 select NEED_MACH_GPIO_H
387 Support for the Cortina Systems Gemini family SoCs
391 select ARCH_USES_GETTIMEOFFSET
394 select NEED_MACH_IO_H
395 select NEED_MACH_MEMORY_H
398 This is an evaluation board for the StrongARM processor available
399 from Digital. It has limited hardware on-board, including an
400 Ethernet interface, two PCMCIA sockets, two serial ports and a
405 select ARCH_HAS_HOLES_MEMORYMODEL
406 select ARCH_REQUIRE_GPIOLIB
407 select ARCH_USES_GETTIMEOFFSET
412 select NEED_MACH_MEMORY_H
414 This enables support for the Cirrus EP93xx series of CPUs.
416 config ARCH_FOOTBRIDGE
420 select GENERIC_CLOCKEVENTS
422 select NEED_MACH_IO_H if !MMU
423 select NEED_MACH_MEMORY_H
425 Support for systems based on the DC21285 companion chip
426 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
429 bool "Hilscher NetX based"
433 select GENERIC_CLOCKEVENTS
435 This enables support for systems based on the Hilscher NetX Soc
440 select ARCH_SUPPORTS_MSI
442 select NEED_MACH_MEMORY_H
443 select NEED_RET_TO_USER
448 Support for Intel's IOP13XX (XScale) family of processors.
453 select ARCH_REQUIRE_GPIOLIB
455 select NEED_MACH_GPIO_H
456 select NEED_RET_TO_USER
460 Support for Intel's 80219 and IOP32X (XScale) family of
466 select ARCH_REQUIRE_GPIOLIB
468 select NEED_MACH_GPIO_H
469 select NEED_RET_TO_USER
473 Support for Intel's IOP33X (XScale) family of processors.
478 select ARCH_HAS_DMA_SET_COHERENT_MASK
479 select ARCH_REQUIRE_GPIOLIB
482 select DMABOUNCE if PCI
483 select GENERIC_CLOCKEVENTS
484 select MIGHT_HAVE_PCI
485 select NEED_MACH_IO_H
486 select USB_EHCI_BIG_ENDIAN_MMIO
487 select USB_EHCI_BIG_ENDIAN_DESC
489 Support for Intel's IXP4XX (XScale) family of processors.
493 select ARCH_REQUIRE_GPIOLIB
495 select GENERIC_CLOCKEVENTS
496 select MIGHT_HAVE_PCI
499 select PLAT_ORION_LEGACY
500 select USB_ARCH_HAS_EHCI
502 Support for the Marvell Dove SoC 88AP510
505 bool "Marvell Kirkwood"
506 select ARCH_REQUIRE_GPIOLIB
508 select GENERIC_CLOCKEVENTS
512 select PINCTRL_KIRKWOOD
513 select PLAT_ORION_LEGACY
515 Support for the following Marvell Kirkwood series SoCs:
516 88F6180, 88F6192 and 88F6281.
519 bool "Marvell MV78xx0"
520 select ARCH_REQUIRE_GPIOLIB
522 select GENERIC_CLOCKEVENTS
524 select PLAT_ORION_LEGACY
526 Support for the following Marvell MV78xx0 series SoCs:
532 select ARCH_REQUIRE_GPIOLIB
534 select GENERIC_CLOCKEVENTS
536 select PLAT_ORION_LEGACY
538 Support for the following Marvell Orion 5x series SoCs:
539 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
540 Orion-2 (5281), Orion-1-90 (6183).
543 bool "Marvell PXA168/910/MMP2"
545 select ARCH_REQUIRE_GPIOLIB
547 select GENERIC_ALLOCATOR
548 select GENERIC_CLOCKEVENTS
551 select NEED_MACH_GPIO_H
556 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
559 bool "Micrel/Kendin KS8695"
560 select ARCH_REQUIRE_GPIOLIB
563 select GENERIC_CLOCKEVENTS
564 select NEED_MACH_MEMORY_H
566 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
567 System-on-Chip devices.
570 bool "Nuvoton W90X900 CPU"
571 select ARCH_REQUIRE_GPIOLIB
575 select GENERIC_CLOCKEVENTS
577 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
578 At present, the w90x900 has been renamed nuc900, regarding
579 the ARM series product line, you can login the following
580 link address to know more.
582 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
583 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
587 select ARCH_REQUIRE_GPIOLIB
592 select GENERIC_CLOCKEVENTS
595 select USB_ARCH_HAS_OHCI
598 Support for the NXP LPC32XX family of processors
601 bool "PXA2xx/PXA3xx-based"
603 select ARCH_HAS_CPUFREQ
605 select ARCH_REQUIRE_GPIOLIB
606 select ARM_CPU_SUSPEND if PM
610 select GENERIC_CLOCKEVENTS
613 select MULTI_IRQ_HANDLER
614 select NEED_MACH_GPIO_H
618 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
622 select ARCH_REQUIRE_GPIOLIB
624 select GENERIC_CLOCKEVENTS
627 Support for Qualcomm MSM/QSD based systems. This runs on the
628 apps processor of the MSM/QSD and depends on a shared memory
629 interface to the modem processor which runs the baseband
630 stack and controls some vital subsystems
631 (clock and power control, etc).
634 bool "Renesas SH-Mobile / R-Mobile"
636 select GENERIC_CLOCKEVENTS
637 select HAVE_ARM_SCU if SMP
638 select HAVE_ARM_TWD if LOCAL_TIMERS
640 select HAVE_MACH_CLKDEV
642 select MIGHT_HAVE_CACHE_L2X0
643 select MULTI_IRQ_HANDLER
644 select NEED_MACH_MEMORY_H
646 select PINCTRL if ARCH_WANT_OPTIONAL_GPIOLIB
647 select PM_GENERIC_DOMAINS if PM
650 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
655 select ARCH_MAY_HAVE_PC_FDC
656 select ARCH_SPARSEMEM_ENABLE
657 select ARCH_USES_GETTIMEOFFSET
660 select HAVE_PATA_PLATFORM
662 select NEED_MACH_IO_H
663 select NEED_MACH_MEMORY_H
667 On the Acorn Risc-PC, Linux can support the internal IDE disk and
668 CD-ROM interface, serial and parallel port, and the floppy drive.
672 select ARCH_HAS_CPUFREQ
674 select ARCH_REQUIRE_GPIOLIB
675 select ARCH_SPARSEMEM_ENABLE
680 select GENERIC_CLOCKEVENTS
683 select NEED_MACH_GPIO_H
684 select NEED_MACH_MEMORY_H
687 Support for StrongARM 11x0 based boards.
690 bool "Samsung S3C24XX SoCs"
691 select ARCH_HAS_CPUFREQ
692 select ARCH_REQUIRE_GPIOLIB
695 select GENERIC_CLOCKEVENTS
697 select HAVE_S3C2410_I2C if I2C
698 select HAVE_S3C2410_WATCHDOG if WATCHDOG
699 select HAVE_S3C_RTC if RTC_CLASS
700 select MULTI_IRQ_HANDLER
701 select NEED_MACH_GPIO_H
702 select NEED_MACH_IO_H
704 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
705 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
706 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
707 Samsung SMDK2410 development board (and derivatives).
710 bool "Samsung S3C64XX"
711 select ARCH_HAS_CPUFREQ
712 select ARCH_REQUIRE_GPIOLIB
717 select GENERIC_CLOCKEVENTS
719 select HAVE_S3C2410_I2C if I2C
720 select HAVE_S3C2410_WATCHDOG if WATCHDOG
722 select NEED_MACH_GPIO_H
726 select S3C_GPIO_TRACK
727 select SAMSUNG_CLKSRC
728 select SAMSUNG_GPIOLIB_4BIT
729 select SAMSUNG_IRQ_VIC_TIMER
730 select USB_ARCH_HAS_OHCI
732 Samsung S3C64XX series based systems
735 bool "Samsung S5P6440 S5P6450"
739 select GENERIC_CLOCKEVENTS
741 select HAVE_S3C2410_I2C if I2C
742 select HAVE_S3C2410_WATCHDOG if WATCHDOG
743 select HAVE_S3C_RTC if RTC_CLASS
744 select NEED_MACH_GPIO_H
746 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
750 bool "Samsung S5PC100"
751 select ARCH_REQUIRE_GPIOLIB
755 select GENERIC_CLOCKEVENTS
757 select HAVE_S3C2410_I2C if I2C
758 select HAVE_S3C2410_WATCHDOG if WATCHDOG
759 select HAVE_S3C_RTC if RTC_CLASS
760 select NEED_MACH_GPIO_H
762 Samsung S5PC100 series based systems
765 bool "Samsung S5PV210/S5PC110"
766 select ARCH_HAS_CPUFREQ
767 select ARCH_HAS_HOLES_MEMORYMODEL
768 select ARCH_SPARSEMEM_ENABLE
772 select GENERIC_CLOCKEVENTS
774 select HAVE_S3C2410_I2C if I2C
775 select HAVE_S3C2410_WATCHDOG if WATCHDOG
776 select HAVE_S3C_RTC if RTC_CLASS
777 select NEED_MACH_GPIO_H
778 select NEED_MACH_MEMORY_H
780 Samsung S5PV210/S5PC110 series based systems
783 bool "Samsung EXYNOS"
784 select ARCH_HAS_CPUFREQ
785 select ARCH_HAS_HOLES_MEMORYMODEL
786 select ARCH_SPARSEMEM_ENABLE
790 select GENERIC_CLOCKEVENTS
792 select HAVE_S3C2410_I2C if I2C
793 select HAVE_S3C2410_WATCHDOG if WATCHDOG
794 select HAVE_S3C_RTC if RTC_CLASS
795 select NEED_MACH_GPIO_H
796 select NEED_MACH_MEMORY_H
798 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
802 select ARCH_USES_GETTIMEOFFSET
806 select NEED_MACH_MEMORY_H
811 Support for the StrongARM based Digital DNARD machine, also known
812 as "Shark" (<http://www.shark-linux.de/shark.html>).
815 bool "ST-Ericsson U300 Series"
817 select ARCH_REQUIRE_GPIOLIB
819 select ARM_PATCH_PHYS_VIRT
825 select GENERIC_CLOCKEVENTS
829 Support for ST-Ericsson U300 series mobile platforms.
833 select ARCH_HAS_HOLES_MEMORYMODEL
834 select ARCH_REQUIRE_GPIOLIB
836 select GENERIC_ALLOCATOR
837 select GENERIC_CLOCKEVENTS
838 select GENERIC_IRQ_CHIP
840 select NEED_MACH_GPIO_H
844 Support for TI's DaVinci platform.
849 select ARCH_HAS_CPUFREQ
850 select ARCH_HAS_HOLES_MEMORYMODEL
852 select ARCH_REQUIRE_GPIOLIB
855 select GENERIC_CLOCKEVENTS
856 select GENERIC_IRQ_CHIP
860 select NEED_MACH_IO_H if PCCARD
861 select NEED_MACH_MEMORY_H
863 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
867 menu "Multiple platform selection"
868 depends on ARCH_MULTIPLATFORM
870 comment "CPU Core family selection"
873 bool "ARMv4 based platforms (FA526, StrongARM)"
874 depends on !ARCH_MULTI_V6_V7
875 select ARCH_MULTI_V4_V5
877 config ARCH_MULTI_V4T
878 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
879 depends on !ARCH_MULTI_V6_V7
880 select ARCH_MULTI_V4_V5
883 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
884 depends on !ARCH_MULTI_V6_V7
885 select ARCH_MULTI_V4_V5
887 config ARCH_MULTI_V4_V5
891 bool "ARMv6 based platforms (ARM11)"
892 select ARCH_MULTI_V6_V7
896 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
898 select ARCH_MULTI_V6_V7
902 config ARCH_MULTI_V6_V7
905 config ARCH_MULTI_CPU_AUTO
906 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
912 # This is sorted alphabetically by mach-* pathname. However, plat-*
913 # Kconfigs may be included either alphabetically (according to the
914 # plat- suffix) or along side the corresponding mach-* source.
916 source "arch/arm/mach-mvebu/Kconfig"
918 source "arch/arm/mach-at91/Kconfig"
920 source "arch/arm/mach-bcm/Kconfig"
922 source "arch/arm/mach-bcm2835/Kconfig"
924 source "arch/arm/mach-clps711x/Kconfig"
926 source "arch/arm/mach-cns3xxx/Kconfig"
928 source "arch/arm/mach-davinci/Kconfig"
930 source "arch/arm/mach-dove/Kconfig"
932 source "arch/arm/mach-ep93xx/Kconfig"
934 source "arch/arm/mach-footbridge/Kconfig"
936 source "arch/arm/mach-gemini/Kconfig"
938 source "arch/arm/mach-highbank/Kconfig"
940 source "arch/arm/mach-integrator/Kconfig"
942 source "arch/arm/mach-iop32x/Kconfig"
944 source "arch/arm/mach-iop33x/Kconfig"
946 source "arch/arm/mach-iop13xx/Kconfig"
948 source "arch/arm/mach-ixp4xx/Kconfig"
950 source "arch/arm/mach-kirkwood/Kconfig"
952 source "arch/arm/mach-ks8695/Kconfig"
954 source "arch/arm/mach-msm/Kconfig"
956 source "arch/arm/mach-mv78xx0/Kconfig"
958 source "arch/arm/mach-imx/Kconfig"
960 source "arch/arm/mach-mxs/Kconfig"
962 source "arch/arm/mach-netx/Kconfig"
964 source "arch/arm/mach-nomadik/Kconfig"
966 source "arch/arm/plat-omap/Kconfig"
968 source "arch/arm/mach-omap1/Kconfig"
970 source "arch/arm/mach-omap2/Kconfig"
972 source "arch/arm/mach-orion5x/Kconfig"
974 source "arch/arm/mach-picoxcell/Kconfig"
976 source "arch/arm/mach-pxa/Kconfig"
977 source "arch/arm/plat-pxa/Kconfig"
979 source "arch/arm/mach-mmp/Kconfig"
981 source "arch/arm/mach-realview/Kconfig"
983 source "arch/arm/mach-sa1100/Kconfig"
985 source "arch/arm/plat-samsung/Kconfig"
987 source "arch/arm/mach-socfpga/Kconfig"
989 source "arch/arm/mach-spear/Kconfig"
991 source "arch/arm/mach-s3c24xx/Kconfig"
994 source "arch/arm/mach-s3c64xx/Kconfig"
997 source "arch/arm/mach-s5p64x0/Kconfig"
999 source "arch/arm/mach-s5pc100/Kconfig"
1001 source "arch/arm/mach-s5pv210/Kconfig"
1003 source "arch/arm/mach-exynos/Kconfig"
1005 source "arch/arm/mach-shmobile/Kconfig"
1007 source "arch/arm/mach-sunxi/Kconfig"
1009 source "arch/arm/mach-prima2/Kconfig"
1011 source "arch/arm/mach-tegra/Kconfig"
1013 source "arch/arm/mach-u300/Kconfig"
1015 source "arch/arm/mach-ux500/Kconfig"
1017 source "arch/arm/mach-versatile/Kconfig"
1019 source "arch/arm/mach-vexpress/Kconfig"
1020 source "arch/arm/plat-versatile/Kconfig"
1022 source "arch/arm/mach-virt/Kconfig"
1024 source "arch/arm/mach-vt8500/Kconfig"
1026 source "arch/arm/mach-w90x900/Kconfig"
1028 source "arch/arm/mach-zynq/Kconfig"
1030 # Definitions to make life easier
1036 select GENERIC_CLOCKEVENTS
1042 select GENERIC_IRQ_CHIP
1045 config PLAT_ORION_LEGACY
1052 config PLAT_VERSATILE
1055 config ARM_TIMER_SP804
1059 source arch/arm/mm/Kconfig
1063 default 16 if ARCH_EP93XX
1067 bool "Enable iWMMXt support" if !CPU_PJ4
1068 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1069 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
1071 Enable support for iWMMXt context switching at run time if
1072 running on a CPU that supports it.
1076 depends on CPU_XSCALE
1079 config MULTI_IRQ_HANDLER
1082 Allow each machine to specify it's own IRQ handler at run time.
1085 source "arch/arm/Kconfig-nommu"
1088 config ARM_ERRATA_326103
1089 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1092 Executing a SWP instruction to read-only memory does not set bit 11
1093 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1094 treat the access as a read, preventing a COW from occurring and
1095 causing the faulting task to livelock.
1097 config ARM_ERRATA_411920
1098 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1099 depends on CPU_V6 || CPU_V6K
1101 Invalidation of the Instruction Cache operation can
1102 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1103 It does not affect the MPCore. This option enables the ARM Ltd.
1104 recommended workaround.
1106 config ARM_ERRATA_430973
1107 bool "ARM errata: Stale prediction on replaced interworking branch"
1110 This option enables the workaround for the 430973 Cortex-A8
1111 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1112 interworking branch is replaced with another code sequence at the
1113 same virtual address, whether due to self-modifying code or virtual
1114 to physical address re-mapping, Cortex-A8 does not recover from the
1115 stale interworking branch prediction. This results in Cortex-A8
1116 executing the new code sequence in the incorrect ARM or Thumb state.
1117 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1118 and also flushes the branch target cache at every context switch.
1119 Note that setting specific bits in the ACTLR register may not be
1120 available in non-secure mode.
1122 config ARM_ERRATA_458693
1123 bool "ARM errata: Processor deadlock when a false hazard is created"
1125 depends on !ARCH_MULTIPLATFORM
1127 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1128 erratum. For very specific sequences of memory operations, it is
1129 possible for a hazard condition intended for a cache line to instead
1130 be incorrectly associated with a different cache line. This false
1131 hazard might then cause a processor deadlock. The workaround enables
1132 the L1 caching of the NEON accesses and disables the PLD instruction
1133 in the ACTLR register. Note that setting specific bits in the ACTLR
1134 register may not be available in non-secure mode.
1136 config ARM_ERRATA_460075
1137 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1139 depends on !ARCH_MULTIPLATFORM
1141 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1142 erratum. Any asynchronous access to the L2 cache may encounter a
1143 situation in which recent store transactions to the L2 cache are lost
1144 and overwritten with stale memory contents from external memory. The
1145 workaround disables the write-allocate mode for the L2 cache via the
1146 ACTLR register. Note that setting specific bits in the ACTLR register
1147 may not be available in non-secure mode.
1149 config ARM_ERRATA_742230
1150 bool "ARM errata: DMB operation may be faulty"
1151 depends on CPU_V7 && SMP
1152 depends on !ARCH_MULTIPLATFORM
1154 This option enables the workaround for the 742230 Cortex-A9
1155 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1156 between two write operations may not ensure the correct visibility
1157 ordering of the two writes. This workaround sets a specific bit in
1158 the diagnostic register of the Cortex-A9 which causes the DMB
1159 instruction to behave as a DSB, ensuring the correct behaviour of
1162 config ARM_ERRATA_742231
1163 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1164 depends on CPU_V7 && SMP
1165 depends on !ARCH_MULTIPLATFORM
1167 This option enables the workaround for the 742231 Cortex-A9
1168 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1169 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1170 accessing some data located in the same cache line, may get corrupted
1171 data due to bad handling of the address hazard when the line gets
1172 replaced from one of the CPUs at the same time as another CPU is
1173 accessing it. This workaround sets specific bits in the diagnostic
1174 register of the Cortex-A9 which reduces the linefill issuing
1175 capabilities of the processor.
1177 config PL310_ERRATA_588369
1178 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1179 depends on CACHE_L2X0
1181 The PL310 L2 cache controller implements three types of Clean &
1182 Invalidate maintenance operations: by Physical Address
1183 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1184 They are architecturally defined to behave as the execution of a
1185 clean operation followed immediately by an invalidate operation,
1186 both performing to the same memory location. This functionality
1187 is not correctly implemented in PL310 as clean lines are not
1188 invalidated as a result of these operations.
1190 config ARM_ERRATA_720789
1191 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1194 This option enables the workaround for the 720789 Cortex-A9 (prior to
1195 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1196 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1197 As a consequence of this erratum, some TLB entries which should be
1198 invalidated are not, resulting in an incoherency in the system page
1199 tables. The workaround changes the TLB flushing routines to invalidate
1200 entries regardless of the ASID.
1202 config PL310_ERRATA_727915
1203 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1204 depends on CACHE_L2X0
1206 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1207 operation (offset 0x7FC). This operation runs in background so that
1208 PL310 can handle normal accesses while it is in progress. Under very
1209 rare circumstances, due to this erratum, write data can be lost when
1210 PL310 treats a cacheable write transaction during a Clean &
1211 Invalidate by Way operation.
1213 config ARM_ERRATA_743622
1214 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1216 depends on !ARCH_MULTIPLATFORM
1218 This option enables the workaround for the 743622 Cortex-A9
1219 (r2p*) erratum. Under very rare conditions, a faulty
1220 optimisation in the Cortex-A9 Store Buffer may lead to data
1221 corruption. This workaround sets a specific bit in the diagnostic
1222 register of the Cortex-A9 which disables the Store Buffer
1223 optimisation, preventing the defect from occurring. This has no
1224 visible impact on the overall performance or power consumption of the
1227 config ARM_ERRATA_751472
1228 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1230 depends on !ARCH_MULTIPLATFORM
1232 This option enables the workaround for the 751472 Cortex-A9 (prior
1233 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1234 completion of a following broadcasted operation if the second
1235 operation is received by a CPU before the ICIALLUIS has completed,
1236 potentially leading to corrupted entries in the cache or TLB.
1238 config PL310_ERRATA_753970
1239 bool "PL310 errata: cache sync operation may be faulty"
1240 depends on CACHE_PL310
1242 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1244 Under some condition the effect of cache sync operation on
1245 the store buffer still remains when the operation completes.
1246 This means that the store buffer is always asked to drain and
1247 this prevents it from merging any further writes. The workaround
1248 is to replace the normal offset of cache sync operation (0x730)
1249 by another offset targeting an unmapped PL310 register 0x740.
1250 This has the same effect as the cache sync operation: store buffer
1251 drain and waiting for all buffers empty.
1253 config ARM_ERRATA_754322
1254 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1257 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1258 r3p*) erratum. A speculative memory access may cause a page table walk
1259 which starts prior to an ASID switch but completes afterwards. This
1260 can populate the micro-TLB with a stale entry which may be hit with
1261 the new ASID. This workaround places two dsb instructions in the mm
1262 switching code so that no page table walks can cross the ASID switch.
1264 config ARM_ERRATA_754327
1265 bool "ARM errata: no automatic Store Buffer drain"
1266 depends on CPU_V7 && SMP
1268 This option enables the workaround for the 754327 Cortex-A9 (prior to
1269 r2p0) erratum. The Store Buffer does not have any automatic draining
1270 mechanism and therefore a livelock may occur if an external agent
1271 continuously polls a memory location waiting to observe an update.
1272 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1273 written polling loops from denying visibility of updates to memory.
1275 config ARM_ERRATA_364296
1276 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1277 depends on CPU_V6 && !SMP
1279 This options enables the workaround for the 364296 ARM1136
1280 r0p2 erratum (possible cache data corruption with
1281 hit-under-miss enabled). It sets the undocumented bit 31 in
1282 the auxiliary control register and the FI bit in the control
1283 register, thus disabling hit-under-miss without putting the
1284 processor into full low interrupt latency mode. ARM11MPCore
1287 config ARM_ERRATA_764369
1288 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1289 depends on CPU_V7 && SMP
1291 This option enables the workaround for erratum 764369
1292 affecting Cortex-A9 MPCore with two or more processors (all
1293 current revisions). Under certain timing circumstances, a data
1294 cache line maintenance operation by MVA targeting an Inner
1295 Shareable memory region may fail to proceed up to either the
1296 Point of Coherency or to the Point of Unification of the
1297 system. This workaround adds a DSB instruction before the
1298 relevant cache maintenance functions and sets a specific bit
1299 in the diagnostic control register of the SCU.
1301 config PL310_ERRATA_769419
1302 bool "PL310 errata: no automatic Store Buffer drain"
1303 depends on CACHE_L2X0
1305 On revisions of the PL310 prior to r3p2, the Store Buffer does
1306 not automatically drain. This can cause normal, non-cacheable
1307 writes to be retained when the memory system is idle, leading
1308 to suboptimal I/O performance for drivers using coherent DMA.
1309 This option adds a write barrier to the cpu_idle loop so that,
1310 on systems with an outer cache, the store buffer is drained
1313 config ARM_ERRATA_775420
1314 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1317 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1318 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1319 operation aborts with MMU exception, it might cause the processor
1320 to deadlock. This workaround puts DSB before executing ISB if
1321 an abort may occur on cache maintenance.
1323 config ARM_ERRATA_798181
1324 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1325 depends on CPU_V7 && SMP
1327 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1328 adequately shooting down all use of the old entries. This
1329 option enables the Linux kernel workaround for this erratum
1330 which sends an IPI to the CPUs that are running the same ASID
1331 as the one being invalidated.
1335 source "arch/arm/common/Kconfig"
1345 Find out whether you have ISA slots on your motherboard. ISA is the
1346 name of a bus system, i.e. the way the CPU talks to the other stuff
1347 inside your box. Other bus systems are PCI, EISA, MicroChannel
1348 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1349 newer boards don't support it. If you have ISA, say Y, otherwise N.
1351 # Select ISA DMA controller support
1356 # Select ISA DMA interface
1361 bool "PCI support" if MIGHT_HAVE_PCI
1363 Find out whether you have a PCI motherboard. PCI is the name of a
1364 bus system, i.e. the way the CPU talks to the other stuff inside
1365 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1366 VESA. If you have PCI, say Y, otherwise N.
1372 config PCI_NANOENGINE
1373 bool "BSE nanoEngine PCI support"
1374 depends on SA1100_NANOENGINE
1376 Enable PCI on the BSE nanoEngine board.
1381 # Select the host bridge type
1382 config PCI_HOST_VIA82C505
1384 depends on PCI && ARCH_SHARK
1387 config PCI_HOST_ITE8152
1389 depends on PCI && MACH_ARMCORE
1393 source "drivers/pci/Kconfig"
1395 source "drivers/pcmcia/Kconfig"
1399 menu "Kernel Features"
1404 This option should be selected by machines which have an SMP-
1407 The only effect of this option is to make the SMP-related
1408 options available to the user for configuration.
1411 bool "Symmetric Multi-Processing"
1412 depends on CPU_V6K || CPU_V7
1413 depends on GENERIC_CLOCKEVENTS
1416 select USE_GENERIC_SMP_HELPERS
1418 This enables support for systems with more than one CPU. If you have
1419 a system with only one CPU, like most personal computers, say N. If
1420 you have a system with more than one CPU, say Y.
1422 If you say N here, the kernel will run on single and multiprocessor
1423 machines, but will use only one CPU of a multiprocessor machine. If
1424 you say Y here, the kernel will run on many, but not all, single
1425 processor machines. On a single processor machine, the kernel will
1426 run faster if you say N here.
1428 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1429 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1430 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1432 If you don't know what to do here, say N.
1435 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1436 depends on SMP && !XIP_KERNEL
1439 SMP kernels contain instructions which fail on non-SMP processors.
1440 Enabling this option allows the kernel to modify itself to make
1441 these instructions safe. Disabling it allows about 1K of space
1444 If you don't know what to do here, say Y.
1446 config ARM_CPU_TOPOLOGY
1447 bool "Support cpu topology definition"
1448 depends on SMP && CPU_V7
1451 Support ARM cpu topology definition. The MPIDR register defines
1452 affinity between processors which is then used to describe the cpu
1453 topology of an ARM System.
1456 bool "Multi-core scheduler support"
1457 depends on ARM_CPU_TOPOLOGY
1459 Multi-core scheduler support improves the CPU scheduler's decision
1460 making when dealing with multi-core CPU chips at a cost of slightly
1461 increased overhead in some places. If unsure say N here.
1464 bool "SMT scheduler support"
1465 depends on ARM_CPU_TOPOLOGY
1467 Improves the CPU scheduler's decision making when dealing with
1468 MultiThreading at a cost of slightly increased overhead in some
1469 places. If unsure say N here.
1474 This option enables support for the ARM system coherency unit
1476 config HAVE_ARM_ARCH_TIMER
1477 bool "Architected timer support"
1479 select ARM_ARCH_TIMER
1481 This option enables support for the ARM architected timer
1486 select CLKSRC_OF if OF
1488 This options enables support for the ARM timer and watchdog unit
1491 bool "Multi-Cluster Power Management"
1492 depends on CPU_V7 && SMP
1494 This option provides the common power management infrastructure
1495 for (multi-)cluster based systems, such as big.LITTLE based
1499 prompt "Memory split"
1502 Select the desired split between kernel and user memory.
1504 If you are not absolutely sure what you are doing, leave this
1508 bool "3G/1G user/kernel split"
1510 bool "2G/2G user/kernel split"
1512 bool "1G/3G user/kernel split"
1517 default 0x40000000 if VMSPLIT_1G
1518 default 0x80000000 if VMSPLIT_2G
1522 int "Maximum number of CPUs (2-32)"
1528 bool "Support for hot-pluggable CPUs"
1529 depends on SMP && HOTPLUG
1531 Say Y here to experiment with turning CPUs off and on. CPUs
1532 can be controlled through /sys/devices/system/cpu.
1535 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1538 Say Y here if you want Linux to communicate with system firmware
1539 implementing the PSCI specification for CPU-centric power
1540 management operations described in ARM document number ARM DEN
1541 0022A ("Power State Coordination Interface System Software on
1545 bool "Use local timer interrupts"
1549 Enable support for local timers on SMP platforms, rather then the
1550 legacy IPI broadcast method. Local timers allows the system
1551 accounting to be spread across the timer interval, preventing a
1552 "thundering herd" at every timer tick.
1554 # The GPIO number here must be sorted by descending number. In case of
1555 # a multiplatform kernel, we just want the highest value required by the
1556 # selected platforms.
1559 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1560 default 512 if SOC_OMAP5
1561 default 392 if ARCH_U8500
1562 default 352 if ARCH_VT8500
1563 default 288 if ARCH_SUNXI
1564 default 264 if MACH_H4700
1567 Maximum number of GPIOs in the system.
1569 If unsure, leave the default value.
1571 source kernel/Kconfig.preempt
1575 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1576 ARCH_S5PV210 || ARCH_EXYNOS4
1577 default AT91_TIMER_HZ if ARCH_AT91
1578 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1582 def_bool HIGH_RES_TIMERS
1584 config THUMB2_KERNEL
1585 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1586 depends on CPU_V7 && !CPU_V6 && !CPU_V6K
1587 default y if CPU_THUMBONLY
1589 select ARM_ASM_UNIFIED
1592 By enabling this option, the kernel will be compiled in
1593 Thumb-2 mode. A compiler/assembler that understand the unified
1594 ARM-Thumb syntax is needed.
1598 config THUMB2_AVOID_R_ARM_THM_JUMP11
1599 bool "Work around buggy Thumb-2 short branch relocations in gas"
1600 depends on THUMB2_KERNEL && MODULES
1603 Various binutils versions can resolve Thumb-2 branches to
1604 locally-defined, preemptible global symbols as short-range "b.n"
1605 branch instructions.
1607 This is a problem, because there's no guarantee the final
1608 destination of the symbol, or any candidate locations for a
1609 trampoline, are within range of the branch. For this reason, the
1610 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1611 relocation in modules at all, and it makes little sense to add
1614 The symptom is that the kernel fails with an "unsupported
1615 relocation" error when loading some modules.
1617 Until fixed tools are available, passing
1618 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1619 code which hits this problem, at the cost of a bit of extra runtime
1620 stack usage in some cases.
1622 The problem is described in more detail at:
1623 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1625 Only Thumb-2 kernels are affected.
1627 Unless you are sure your tools don't have this problem, say Y.
1629 config ARM_ASM_UNIFIED
1633 bool "Use the ARM EABI to compile the kernel"
1635 This option allows for the kernel to be compiled using the latest
1636 ARM ABI (aka EABI). This is only useful if you are using a user
1637 space environment that is also compiled with EABI.
1639 Since there are major incompatibilities between the legacy ABI and
1640 EABI, especially with regard to structure member alignment, this
1641 option also changes the kernel syscall calling convention to
1642 disambiguate both ABIs and allow for backward compatibility support
1643 (selected with CONFIG_OABI_COMPAT).
1645 To use this you need GCC version 4.0.0 or later.
1648 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1649 depends on AEABI && !THUMB2_KERNEL
1652 This option preserves the old syscall interface along with the
1653 new (ARM EABI) one. It also provides a compatibility layer to
1654 intercept syscalls that have structure arguments which layout
1655 in memory differs between the legacy ABI and the new ARM EABI
1656 (only for non "thumb" binaries). This option adds a tiny
1657 overhead to all syscalls and produces a slightly larger kernel.
1658 If you know you'll be using only pure EABI user space then you
1659 can say N here. If this option is not selected and you attempt
1660 to execute a legacy ABI binary then the result will be
1661 UNPREDICTABLE (in fact it can be predicted that it won't work
1662 at all). If in doubt say Y.
1664 config ARCH_HAS_HOLES_MEMORYMODEL
1667 config ARCH_SPARSEMEM_ENABLE
1670 config ARCH_SPARSEMEM_DEFAULT
1671 def_bool ARCH_SPARSEMEM_ENABLE
1673 config ARCH_SELECT_MEMORY_MODEL
1674 def_bool ARCH_SPARSEMEM_ENABLE
1676 config HAVE_ARCH_PFN_VALID
1677 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1680 bool "High Memory Support"
1683 The address space of ARM processors is only 4 Gigabytes large
1684 and it has to accommodate user address space, kernel address
1685 space as well as some memory mapped IO. That means that, if you
1686 have a large amount of physical memory and/or IO, not all of the
1687 memory can be "permanently mapped" by the kernel. The physical
1688 memory that is not permanently mapped is called "high memory".
1690 Depending on the selected kernel/user memory split, minimum
1691 vmalloc space and actual amount of RAM, you may not need this
1692 option which should result in a slightly faster kernel.
1697 bool "Allocate 2nd-level pagetables from highmem"
1700 config HW_PERF_EVENTS
1701 bool "Enable hardware performance counter support for perf events"
1702 depends on PERF_EVENTS
1705 Enable hardware performance counter support for perf events. If
1706 disabled, perf events will use software events only.
1710 config FORCE_MAX_ZONEORDER
1711 int "Maximum zone order" if ARCH_SHMOBILE
1712 range 11 64 if ARCH_SHMOBILE
1713 default "12" if SOC_AM33XX
1714 default "9" if SA1111
1717 The kernel memory allocator divides physically contiguous memory
1718 blocks into "zones", where each zone is a power of two number of
1719 pages. This option selects the largest power of two that the kernel
1720 keeps in the memory allocator. If you need to allocate very large
1721 blocks of physically contiguous memory, then you may need to
1722 increase this value.
1724 This config option is actually maximum order plus one. For example,
1725 a value of 11 means that the largest free memory block is 2^10 pages.
1727 config ALIGNMENT_TRAP
1729 depends on CPU_CP15_MMU
1730 default y if !ARCH_EBSA110
1731 select HAVE_PROC_CPU if PROC_FS
1733 ARM processors cannot fetch/store information which is not
1734 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1735 address divisible by 4. On 32-bit ARM processors, these non-aligned
1736 fetch/store instructions will be emulated in software if you say
1737 here, which has a severe performance impact. This is necessary for
1738 correct operation of some network protocols. With an IP-only
1739 configuration it is safe to say N, otherwise say Y.
1741 config UACCESS_WITH_MEMCPY
1742 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1744 default y if CPU_FEROCEON
1746 Implement faster copy_to_user and clear_user methods for CPU
1747 cores where a 8-word STM instruction give significantly higher
1748 memory write throughput than a sequence of individual 32bit stores.
1750 A possible side effect is a slight increase in scheduling latency
1751 between threads sharing the same address space if they invoke
1752 such copy operations with large buffers.
1754 However, if the CPU data cache is using a write-allocate mode,
1755 this option is unlikely to provide any performance gain.
1759 prompt "Enable seccomp to safely compute untrusted bytecode"
1761 This kernel feature is useful for number crunching applications
1762 that may need to compute untrusted bytecode during their
1763 execution. By using pipes or other transports made available to
1764 the process as file descriptors supporting the read/write
1765 syscalls, it's possible to isolate those applications in
1766 their own address space using seccomp. Once seccomp is
1767 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1768 and the task is only allowed to execute a few safe syscalls
1769 defined by each seccomp mode.
1771 config CC_STACKPROTECTOR
1772 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1774 This option turns on the -fstack-protector GCC feature. This
1775 feature puts, at the beginning of functions, a canary value on
1776 the stack just before the return address, and validates
1777 the value just before actually returning. Stack based buffer
1778 overflows (that need to overwrite this return address) now also
1779 overwrite the canary, which gets detected and the attack is then
1780 neutralized via a kernel panic.
1781 This feature requires gcc version 4.2 or above.
1788 bool "Xen guest support on ARM (EXPERIMENTAL)"
1789 depends on ARM && AEABI && OF
1790 depends on CPU_V7 && !CPU_V6
1791 depends on !GENERIC_ATOMIC64
1793 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1800 bool "Flattened Device Tree support"
1803 select OF_EARLY_FLATTREE
1805 Include support for flattened device tree machine descriptions.
1808 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1811 This is the traditional way of passing data to the kernel at boot
1812 time. If you are solely relying on the flattened device tree (or
1813 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1814 to remove ATAGS support from your kernel binary. If unsure,
1817 config DEPRECATED_PARAM_STRUCT
1818 bool "Provide old way to pass kernel parameters"
1821 This was deprecated in 2001 and announced to live on for 5 years.
1822 Some old boot loaders still use this way.
1824 # Compressed boot loader in ROM. Yes, we really want to ask about
1825 # TEXT and BSS so we preserve their values in the config files.
1826 config ZBOOT_ROM_TEXT
1827 hex "Compressed ROM boot loader base address"
1830 The physical address at which the ROM-able zImage is to be
1831 placed in the target. Platforms which normally make use of
1832 ROM-able zImage formats normally set this to a suitable
1833 value in their defconfig file.
1835 If ZBOOT_ROM is not enabled, this has no effect.
1837 config ZBOOT_ROM_BSS
1838 hex "Compressed ROM boot loader BSS address"
1841 The base address of an area of read/write memory in the target
1842 for the ROM-able zImage which must be available while the
1843 decompressor is running. It must be large enough to hold the
1844 entire decompressed kernel plus an additional 128 KiB.
1845 Platforms which normally make use of ROM-able zImage formats
1846 normally set this to a suitable value in their defconfig file.
1848 If ZBOOT_ROM is not enabled, this has no effect.
1851 bool "Compressed boot loader in ROM/flash"
1852 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1854 Say Y here if you intend to execute your compressed kernel image
1855 (zImage) directly from ROM or flash. If unsure, say N.
1858 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1859 depends on ZBOOT_ROM && ARCH_SH7372
1860 default ZBOOT_ROM_NONE
1862 Include experimental SD/MMC loading code in the ROM-able zImage.
1863 With this enabled it is possible to write the ROM-able zImage
1864 kernel image to an MMC or SD card and boot the kernel straight
1865 from the reset vector. At reset the processor Mask ROM will load
1866 the first part of the ROM-able zImage which in turn loads the
1867 rest the kernel image to RAM.
1869 config ZBOOT_ROM_NONE
1870 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1872 Do not load image from SD or MMC
1874 config ZBOOT_ROM_MMCIF
1875 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1877 Load image from MMCIF hardware block.
1879 config ZBOOT_ROM_SH_MOBILE_SDHI
1880 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1882 Load image from SDHI hardware block
1886 config ARM_APPENDED_DTB
1887 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1888 depends on OF && !ZBOOT_ROM
1890 With this option, the boot code will look for a device tree binary
1891 (DTB) appended to zImage
1892 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1894 This is meant as a backward compatibility convenience for those
1895 systems with a bootloader that can't be upgraded to accommodate
1896 the documented boot protocol using a device tree.
1898 Beware that there is very little in terms of protection against
1899 this option being confused by leftover garbage in memory that might
1900 look like a DTB header after a reboot if no actual DTB is appended
1901 to zImage. Do not leave this option active in a production kernel
1902 if you don't intend to always append a DTB. Proper passing of the
1903 location into r2 of a bootloader provided DTB is always preferable
1906 config ARM_ATAG_DTB_COMPAT
1907 bool "Supplement the appended DTB with traditional ATAG information"
1908 depends on ARM_APPENDED_DTB
1910 Some old bootloaders can't be updated to a DTB capable one, yet
1911 they provide ATAGs with memory configuration, the ramdisk address,
1912 the kernel cmdline string, etc. Such information is dynamically
1913 provided by the bootloader and can't always be stored in a static
1914 DTB. To allow a device tree enabled kernel to be used with such
1915 bootloaders, this option allows zImage to extract the information
1916 from the ATAG list and store it at run time into the appended DTB.
1919 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1920 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1922 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1923 bool "Use bootloader kernel arguments if available"
1925 Uses the command-line options passed by the boot loader instead of
1926 the device tree bootargs property. If the boot loader doesn't provide
1927 any, the device tree bootargs property will be used.
1929 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1930 bool "Extend with bootloader kernel arguments"
1932 The command-line arguments provided by the boot loader will be
1933 appended to the the device tree bootargs property.
1938 string "Default kernel command string"
1941 On some architectures (EBSA110 and CATS), there is currently no way
1942 for the boot loader to pass arguments to the kernel. For these
1943 architectures, you should supply some command-line options at build
1944 time by entering them here. As a minimum, you should specify the
1945 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1948 prompt "Kernel command line type" if CMDLINE != ""
1949 default CMDLINE_FROM_BOOTLOADER
1952 config CMDLINE_FROM_BOOTLOADER
1953 bool "Use bootloader kernel arguments if available"
1955 Uses the command-line options passed by the boot loader. If
1956 the boot loader doesn't provide any, the default kernel command
1957 string provided in CMDLINE will be used.
1959 config CMDLINE_EXTEND
1960 bool "Extend bootloader kernel arguments"
1962 The command-line arguments provided by the boot loader will be
1963 appended to the default kernel command string.
1965 config CMDLINE_FORCE
1966 bool "Always use the default kernel command string"
1968 Always use the default kernel command string, even if the boot
1969 loader passes other arguments to the kernel.
1970 This is useful if you cannot or don't want to change the
1971 command-line options your boot loader passes to the kernel.
1975 bool "Kernel Execute-In-Place from ROM"
1976 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
1978 Execute-In-Place allows the kernel to run from non-volatile storage
1979 directly addressable by the CPU, such as NOR flash. This saves RAM
1980 space since the text section of the kernel is not loaded from flash
1981 to RAM. Read-write sections, such as the data section and stack,
1982 are still copied to RAM. The XIP kernel is not compressed since
1983 it has to run directly from flash, so it will take more space to
1984 store it. The flash address used to link the kernel object files,
1985 and for storing it, is configuration dependent. Therefore, if you
1986 say Y here, you must know the proper physical address where to
1987 store the kernel image depending on your own flash memory usage.
1989 Also note that the make target becomes "make xipImage" rather than
1990 "make zImage" or "make Image". The final kernel binary to put in
1991 ROM memory will be arch/arm/boot/xipImage.
1995 config XIP_PHYS_ADDR
1996 hex "XIP Kernel Physical Location"
1997 depends on XIP_KERNEL
1998 default "0x00080000"
2000 This is the physical address in your flash memory the kernel will
2001 be linked for and stored to. This address is dependent on your
2005 bool "Kexec system call (EXPERIMENTAL)"
2006 depends on (!SMP || HOTPLUG_CPU)
2008 kexec is a system call that implements the ability to shutdown your
2009 current kernel, and to start another kernel. It is like a reboot
2010 but it is independent of the system firmware. And like a reboot
2011 you can start any kernel with it, not just Linux.
2013 It is an ongoing process to be certain the hardware in a machine
2014 is properly shutdown, so do not be surprised if this code does not
2015 initially work for you. It may help to enable device hotplugging
2019 bool "Export atags in procfs"
2020 depends on ATAGS && KEXEC
2023 Should the atags used to boot the kernel be exported in an "atags"
2024 file in procfs. Useful with kexec.
2027 bool "Build kdump crash kernel (EXPERIMENTAL)"
2029 Generate crash dump after being started by kexec. This should
2030 be normally only set in special crash dump kernels which are
2031 loaded in the main kernel with kexec-tools into a specially
2032 reserved region and then later executed after a crash by
2033 kdump/kexec. The crash dump kernel must be compiled to a
2034 memory address not used by the main kernel
2036 For more details see Documentation/kdump/kdump.txt
2038 config AUTO_ZRELADDR
2039 bool "Auto calculation of the decompressed kernel image address"
2040 depends on !ZBOOT_ROM && !ARCH_U300
2042 ZRELADDR is the physical address where the decompressed kernel
2043 image will be placed. If AUTO_ZRELADDR is selected, the address
2044 will be determined at run-time by masking the current IP with
2045 0xf8000000. This assumes the zImage being placed in the first 128MB
2046 from start of memory.
2050 menu "CPU Power Management"
2053 source "drivers/cpufreq/Kconfig"
2058 Internal configuration node for common cpufreq on Samsung SoC
2060 config CPU_FREQ_S3C24XX
2061 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2062 depends on ARCH_S3C24XX && CPU_FREQ
2065 This enables the CPUfreq driver for the Samsung S3C24XX family
2068 For details, take a look at <file:Documentation/cpu-freq>.
2072 config CPU_FREQ_S3C24XX_PLL
2073 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2074 depends on CPU_FREQ_S3C24XX
2076 Compile in support for changing the PLL frequency from the
2077 S3C24XX series CPUfreq driver. The PLL takes time to settle
2078 after a frequency change, so by default it is not enabled.
2080 This also means that the PLL tables for the selected CPU(s) will
2081 be built which may increase the size of the kernel image.
2083 config CPU_FREQ_S3C24XX_DEBUG
2084 bool "Debug CPUfreq Samsung driver core"
2085 depends on CPU_FREQ_S3C24XX
2087 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2089 config CPU_FREQ_S3C24XX_IODEBUG
2090 bool "Debug CPUfreq Samsung driver IO timing"
2091 depends on CPU_FREQ_S3C24XX
2093 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2095 config CPU_FREQ_S3C24XX_DEBUGFS
2096 bool "Export debugfs for CPUFreq"
2097 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2099 Export status information via debugfs.
2103 source "drivers/cpuidle/Kconfig"
2107 menu "Floating point emulation"
2109 comment "At least one emulation must be selected"
2112 bool "NWFPE math emulation"
2113 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2115 Say Y to include the NWFPE floating point emulator in the kernel.
2116 This is necessary to run most binaries. Linux does not currently
2117 support floating point hardware so you need to say Y here even if
2118 your machine has an FPA or floating point co-processor podule.
2120 You may say N here if you are going to load the Acorn FPEmulator
2121 early in the bootup.
2124 bool "Support extended precision"
2125 depends on FPE_NWFPE
2127 Say Y to include 80-bit support in the kernel floating-point
2128 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2129 Note that gcc does not generate 80-bit operations by default,
2130 so in most cases this option only enlarges the size of the
2131 floating point emulator without any good reason.
2133 You almost surely want to say N here.
2136 bool "FastFPE math emulation (EXPERIMENTAL)"
2137 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2139 Say Y here to include the FAST floating point emulator in the kernel.
2140 This is an experimental much faster emulator which now also has full
2141 precision for the mantissa. It does not support any exceptions.
2142 It is very simple, and approximately 3-6 times faster than NWFPE.
2144 It should be sufficient for most programs. It may be not suitable
2145 for scientific calculations, but you have to check this for yourself.
2146 If you do not feel you need a faster FP emulation you should better
2150 bool "VFP-format floating point maths"
2151 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2153 Say Y to include VFP support code in the kernel. This is needed
2154 if your hardware includes a VFP unit.
2156 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2157 release notes and additional status information.
2159 Say N if your target does not have VFP hardware.
2167 bool "Advanced SIMD (NEON) Extension support"
2168 depends on VFPv3 && CPU_V7
2170 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2175 menu "Userspace binary formats"
2177 source "fs/Kconfig.binfmt"
2180 tristate "RISC OS personality"
2183 Say Y here to include the kernel code necessary if you want to run
2184 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2185 experimental; if this sounds frightening, say N and sleep in peace.
2186 You can also say M here to compile this support as a module (which
2187 will be called arthur).
2191 menu "Power management options"
2193 source "kernel/power/Kconfig"
2195 config ARCH_SUSPEND_POSSIBLE
2196 depends on !ARCH_S5PC100
2197 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2198 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2201 config ARM_CPU_SUSPEND
2206 source "net/Kconfig"
2208 source "drivers/Kconfig"
2212 source "arch/arm/Kconfig.debug"
2214 source "security/Kconfig"
2216 source "crypto/Kconfig"
2218 source "lib/Kconfig"
2220 source "arch/arm/kvm/Kconfig"