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_IRQ_TIME_ACCOUNTING
42 select HAVE_KERNEL_GZIP
43 select HAVE_KERNEL_LZMA
44 select HAVE_KERNEL_LZO
46 select HAVE_KPROBES if !XIP_KERNEL
47 select HAVE_KRETPROBES if (HAVE_KPROBES)
49 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
50 select HAVE_PERF_EVENTS
51 select HAVE_REGS_AND_STACK_ACCESS_API
52 select HAVE_SYSCALL_TRACEPOINTS
55 select PERF_USE_VMALLOC
57 select SYS_SUPPORTS_APM_EMULATION
58 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
59 select MODULES_USE_ELF_REL
60 select CLONE_BACKWARDS
61 select OLD_SIGSUSPEND3
63 select HAVE_CONTEXT_TRACKING
65 The ARM series is a line of low-power-consumption RISC chip designs
66 licensed by ARM Ltd and targeted at embedded applications and
67 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
68 manufactured, but legacy ARM-based PC hardware remains popular in
69 Europe. There is an ARM Linux project with a web page at
70 <http://www.arm.linux.org.uk/>.
72 config ARM_HAS_SG_CHAIN
75 config NEED_SG_DMA_LENGTH
78 config ARM_DMA_USE_IOMMU
80 select ARM_HAS_SG_CHAIN
81 select NEED_SG_DMA_LENGTH
85 config ARM_DMA_IOMMU_ALIGNMENT
86 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
90 DMA mapping framework by default aligns all buffers to the smallest
91 PAGE_SIZE order which is greater than or equal to the requested buffer
92 size. This works well for buffers up to a few hundreds kilobytes, but
93 for larger buffers it just a waste of address space. Drivers which has
94 relatively small addressing window (like 64Mib) might run out of
95 virtual space with just a few allocations.
97 With this parameter you can specify the maximum PAGE_SIZE order for
98 DMA IOMMU buffers. Larger buffers will be aligned only to this
99 specified order. The order is expressed as a power of two multiplied
107 config MIGHT_HAVE_PCI
110 config SYS_SUPPORTS_APM_EMULATION
115 select GENERIC_ALLOCATOR
126 The Extended Industry Standard Architecture (EISA) bus was
127 developed as an open alternative to the IBM MicroChannel bus.
129 The EISA bus provided some of the features of the IBM MicroChannel
130 bus while maintaining backward compatibility with cards made for
131 the older ISA bus. The EISA bus saw limited use between 1988 and
132 1995 when it was made obsolete by the PCI bus.
134 Say Y here if you are building a kernel for an EISA-based machine.
141 config STACKTRACE_SUPPORT
145 config HAVE_LATENCYTOP_SUPPORT
150 config LOCKDEP_SUPPORT
154 config TRACE_IRQFLAGS_SUPPORT
158 config RWSEM_GENERIC_SPINLOCK
162 config RWSEM_XCHGADD_ALGORITHM
165 config ARCH_HAS_ILOG2_U32
168 config ARCH_HAS_ILOG2_U64
171 config ARCH_HAS_CPUFREQ
174 Internal node to signify that the ARCH has CPUFREQ support
175 and that the relevant menu configurations are displayed for
178 config GENERIC_HWEIGHT
182 config GENERIC_CALIBRATE_DELAY
186 config ARCH_MAY_HAVE_PC_FDC
192 config NEED_DMA_MAP_STATE
195 config ARCH_HAS_DMA_SET_COHERENT_MASK
198 config GENERIC_ISA_DMA
204 config NEED_RET_TO_USER
212 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
213 default DRAM_BASE if REMAP_VECTORS_TO_RAM
216 The base address of exception vectors.
218 config ARM_PATCH_PHYS_VIRT
219 bool "Patch physical to virtual translations at runtime" if EMBEDDED
221 depends on !XIP_KERNEL && MMU
222 depends on !ARCH_REALVIEW || !SPARSEMEM
224 Patch phys-to-virt and virt-to-phys translation functions at
225 boot and module load time according to the position of the
226 kernel in system memory.
228 This can only be used with non-XIP MMU kernels where the base
229 of physical memory is at a 16MB boundary.
231 Only disable this option if you know that you do not require
232 this feature (eg, building a kernel for a single machine) and
233 you need to shrink the kernel to the minimal size.
235 config NEED_MACH_GPIO_H
238 Select this when mach/gpio.h is required to provide special
239 definitions for this platform. The need for mach/gpio.h should
240 be avoided when possible.
242 config NEED_MACH_IO_H
245 Select this when mach/io.h is required to provide special
246 definitions for this platform. The need for mach/io.h should
247 be avoided when possible.
249 config NEED_MACH_MEMORY_H
252 Select this when mach/memory.h is required to provide special
253 definitions for this platform. The need for mach/memory.h should
254 be avoided when possible.
257 hex "Physical address of main memory" if MMU
258 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
259 default DRAM_BASE if !MMU
261 Please provide the physical address corresponding to the
262 location of main memory in your system.
268 source "init/Kconfig"
270 source "kernel/Kconfig.freezer"
275 bool "MMU-based Paged Memory Management Support"
278 Select if you want MMU-based virtualised addressing space
279 support by paged memory management. If unsure, say 'Y'.
282 # The "ARM system type" choice list is ordered alphabetically by option
283 # text. Please add new entries in the option alphabetic order.
286 prompt "ARM system type"
287 default ARCH_VERSATILE if !MMU
288 default ARCH_MULTIPLATFORM if MMU
290 config ARCH_MULTIPLATFORM
291 bool "Allow multiple platforms to be selected"
293 select ARM_PATCH_PHYS_VIRT
296 select MULTI_IRQ_HANDLER
300 config ARCH_INTEGRATOR
301 bool "ARM Ltd. Integrator family"
302 select ARCH_HAS_CPUFREQ
305 select COMMON_CLK_VERSATILE
306 select GENERIC_CLOCKEVENTS
309 select MULTI_IRQ_HANDLER
310 select NEED_MACH_MEMORY_H
311 select PLAT_VERSATILE
313 select VERSATILE_FPGA_IRQ
315 Support for ARM's Integrator platform.
318 bool "ARM Ltd. RealView family"
319 select ARCH_WANT_OPTIONAL_GPIOLIB
321 select ARM_TIMER_SP804
323 select COMMON_CLK_VERSATILE
324 select GENERIC_CLOCKEVENTS
325 select GPIO_PL061 if GPIOLIB
327 select NEED_MACH_MEMORY_H
328 select PLAT_VERSATILE
329 select PLAT_VERSATILE_CLCD
331 This enables support for ARM Ltd RealView boards.
333 config ARCH_VERSATILE
334 bool "ARM Ltd. Versatile family"
335 select ARCH_WANT_OPTIONAL_GPIOLIB
337 select ARM_TIMER_SP804
340 select GENERIC_CLOCKEVENTS
341 select HAVE_MACH_CLKDEV
343 select PLAT_VERSATILE
344 select PLAT_VERSATILE_CLCD
345 select PLAT_VERSATILE_CLOCK
346 select VERSATILE_FPGA_IRQ
348 This enables support for ARM Ltd Versatile board.
352 select ARCH_REQUIRE_GPIOLIB
356 select NEED_MACH_GPIO_H
357 select NEED_MACH_IO_H if PCCARD
359 select PINCTRL_AT91 if USE_OF
361 This enables support for systems based on Atmel
362 AT91RM9200 and AT91SAM9* processors.
365 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
366 select ARCH_REQUIRE_GPIOLIB
371 select GENERIC_CLOCKEVENTS
372 select MULTI_IRQ_HANDLER
373 select NEED_MACH_MEMORY_H
376 Support for Cirrus Logic 711x/721x/731x based boards.
379 bool "Cortina Systems Gemini"
380 select ARCH_REQUIRE_GPIOLIB
381 select ARCH_USES_GETTIMEOFFSET
382 select NEED_MACH_GPIO_H
385 Support for the Cortina Systems Gemini family SoCs
389 select ARCH_USES_GETTIMEOFFSET
392 select NEED_MACH_IO_H
393 select NEED_MACH_MEMORY_H
396 This is an evaluation board for the StrongARM processor available
397 from Digital. It has limited hardware on-board, including an
398 Ethernet interface, two PCMCIA sockets, two serial ports and a
403 select ARCH_HAS_HOLES_MEMORYMODEL
404 select ARCH_REQUIRE_GPIOLIB
405 select ARCH_USES_GETTIMEOFFSET
410 select NEED_MACH_MEMORY_H
412 This enables support for the Cirrus EP93xx series of CPUs.
414 config ARCH_FOOTBRIDGE
418 select GENERIC_CLOCKEVENTS
420 select NEED_MACH_IO_H if !MMU
421 select NEED_MACH_MEMORY_H
423 Support for systems based on the DC21285 companion chip
424 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
427 bool "Hilscher NetX based"
431 select GENERIC_CLOCKEVENTS
433 This enables support for systems based on the Hilscher NetX Soc
438 select ARCH_SUPPORTS_MSI
440 select NEED_MACH_MEMORY_H
441 select NEED_RET_TO_USER
446 Support for Intel's IOP13XX (XScale) family of processors.
451 select ARCH_REQUIRE_GPIOLIB
453 select NEED_MACH_GPIO_H
454 select NEED_RET_TO_USER
458 Support for Intel's 80219 and IOP32X (XScale) family of
464 select ARCH_REQUIRE_GPIOLIB
466 select NEED_MACH_GPIO_H
467 select NEED_RET_TO_USER
471 Support for Intel's IOP33X (XScale) family of processors.
476 select ARCH_HAS_DMA_SET_COHERENT_MASK
477 select ARCH_REQUIRE_GPIOLIB
480 select DMABOUNCE if PCI
481 select GENERIC_CLOCKEVENTS
482 select MIGHT_HAVE_PCI
483 select NEED_MACH_IO_H
484 select USB_EHCI_BIG_ENDIAN_MMIO
485 select USB_EHCI_BIG_ENDIAN_DESC
487 Support for Intel's IXP4XX (XScale) family of processors.
491 select ARCH_REQUIRE_GPIOLIB
493 select GENERIC_CLOCKEVENTS
494 select MIGHT_HAVE_PCI
497 select PLAT_ORION_LEGACY
498 select USB_ARCH_HAS_EHCI
501 Support for the Marvell Dove SoC 88AP510
504 bool "Marvell Kirkwood"
505 select ARCH_REQUIRE_GPIOLIB
507 select GENERIC_CLOCKEVENTS
511 select PINCTRL_KIRKWOOD
512 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
527 Support for the following Marvell MV78xx0 series SoCs:
533 select ARCH_REQUIRE_GPIOLIB
535 select GENERIC_CLOCKEVENTS
537 select PLAT_ORION_LEGACY
540 Support for the following Marvell Orion 5x series SoCs:
541 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
542 Orion-2 (5281), Orion-1-90 (6183).
545 bool "Marvell PXA168/910/MMP2"
547 select ARCH_REQUIRE_GPIOLIB
549 select GENERIC_ALLOCATOR
550 select GENERIC_CLOCKEVENTS
553 select NEED_MACH_GPIO_H
558 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
561 bool "Micrel/Kendin KS8695"
562 select ARCH_REQUIRE_GPIOLIB
565 select GENERIC_CLOCKEVENTS
566 select NEED_MACH_MEMORY_H
568 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
569 System-on-Chip devices.
572 bool "Nuvoton W90X900 CPU"
573 select ARCH_REQUIRE_GPIOLIB
577 select GENERIC_CLOCKEVENTS
579 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
580 At present, the w90x900 has been renamed nuc900, regarding
581 the ARM series product line, you can login the following
582 link address to know more.
584 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
585 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
589 select ARCH_REQUIRE_GPIOLIB
594 select GENERIC_CLOCKEVENTS
597 select USB_ARCH_HAS_OHCI
600 Support for the NXP LPC32XX family of processors
603 bool "PXA2xx/PXA3xx-based"
605 select ARCH_HAS_CPUFREQ
607 select ARCH_REQUIRE_GPIOLIB
608 select ARM_CPU_SUSPEND if PM
612 select GENERIC_CLOCKEVENTS
615 select MULTI_IRQ_HANDLER
616 select NEED_MACH_GPIO_H
620 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
624 select ARCH_REQUIRE_GPIOLIB
626 select GENERIC_CLOCKEVENTS
629 Support for Qualcomm MSM/QSD based systems. This runs on the
630 apps processor of the MSM/QSD and depends on a shared memory
631 interface to the modem processor which runs the baseband
632 stack and controls some vital subsystems
633 (clock and power control, etc).
636 bool "Renesas SH-Mobile / R-Mobile"
638 select GENERIC_CLOCKEVENTS
639 select HAVE_ARM_SCU if SMP
640 select HAVE_ARM_TWD if LOCAL_TIMERS
642 select HAVE_MACH_CLKDEV
644 select MIGHT_HAVE_CACHE_L2X0
645 select MULTI_IRQ_HANDLER
646 select NEED_MACH_MEMORY_H
648 select PINCTRL if ARCH_WANT_OPTIONAL_GPIOLIB
649 select PM_GENERIC_DOMAINS if PM
652 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
657 select ARCH_MAY_HAVE_PC_FDC
658 select ARCH_SPARSEMEM_ENABLE
659 select ARCH_USES_GETTIMEOFFSET
662 select HAVE_PATA_PLATFORM
664 select NEED_MACH_IO_H
665 select NEED_MACH_MEMORY_H
669 On the Acorn Risc-PC, Linux can support the internal IDE disk and
670 CD-ROM interface, serial and parallel port, and the floppy drive.
674 select ARCH_HAS_CPUFREQ
676 select ARCH_REQUIRE_GPIOLIB
677 select ARCH_SPARSEMEM_ENABLE
682 select GENERIC_CLOCKEVENTS
685 select NEED_MACH_GPIO_H
686 select NEED_MACH_MEMORY_H
689 Support for StrongARM 11x0 based boards.
692 bool "Samsung S3C24XX SoCs"
693 select ARCH_HAS_CPUFREQ
694 select ARCH_REQUIRE_GPIOLIB
697 select GENERIC_CLOCKEVENTS
699 select HAVE_S3C2410_I2C if I2C
700 select HAVE_S3C2410_WATCHDOG if WATCHDOG
701 select HAVE_S3C_RTC if RTC_CLASS
702 select MULTI_IRQ_HANDLER
703 select NEED_MACH_GPIO_H
704 select NEED_MACH_IO_H
706 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
707 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
708 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
709 Samsung SMDK2410 development board (and derivatives).
712 bool "Samsung S3C64XX"
713 select ARCH_HAS_CPUFREQ
714 select ARCH_REQUIRE_GPIOLIB
719 select GENERIC_CLOCKEVENTS
721 select HAVE_S3C2410_I2C if I2C
722 select HAVE_S3C2410_WATCHDOG if WATCHDOG
724 select NEED_MACH_GPIO_H
728 select S3C_GPIO_TRACK
729 select SAMSUNG_CLKSRC
730 select SAMSUNG_GPIOLIB_4BIT
731 select SAMSUNG_IRQ_VIC_TIMER
732 select USB_ARCH_HAS_OHCI
734 Samsung S3C64XX series based systems
737 bool "Samsung S5P6440 S5P6450"
741 select GENERIC_CLOCKEVENTS
743 select HAVE_S3C2410_I2C if I2C
744 select HAVE_S3C2410_WATCHDOG if WATCHDOG
745 select HAVE_S3C_RTC if RTC_CLASS
746 select NEED_MACH_GPIO_H
748 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
752 bool "Samsung S5PC100"
753 select ARCH_REQUIRE_GPIOLIB
757 select GENERIC_CLOCKEVENTS
759 select HAVE_S3C2410_I2C if I2C
760 select HAVE_S3C2410_WATCHDOG if WATCHDOG
761 select HAVE_S3C_RTC if RTC_CLASS
762 select NEED_MACH_GPIO_H
764 Samsung S5PC100 series based systems
767 bool "Samsung S5PV210/S5PC110"
768 select ARCH_HAS_CPUFREQ
769 select ARCH_HAS_HOLES_MEMORYMODEL
770 select ARCH_SPARSEMEM_ENABLE
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
780 select NEED_MACH_MEMORY_H
782 Samsung S5PV210/S5PC110 series based systems
785 bool "Samsung EXYNOS"
786 select ARCH_HAS_CPUFREQ
787 select ARCH_HAS_HOLES_MEMORYMODEL
788 select ARCH_SPARSEMEM_ENABLE
792 select GENERIC_CLOCKEVENTS
794 select HAVE_S3C2410_I2C if I2C
795 select HAVE_S3C2410_WATCHDOG if WATCHDOG
796 select HAVE_S3C_RTC if RTC_CLASS
797 select NEED_MACH_GPIO_H
798 select NEED_MACH_MEMORY_H
800 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
804 select ARCH_USES_GETTIMEOFFSET
808 select NEED_MACH_MEMORY_H
813 Support for the StrongARM based Digital DNARD machine, also known
814 as "Shark" (<http://www.shark-linux.de/shark.html>).
817 bool "ST-Ericsson U300 Series"
819 select ARCH_REQUIRE_GPIOLIB
821 select ARM_PATCH_PHYS_VIRT
827 select GENERIC_CLOCKEVENTS
831 Support for ST-Ericsson U300 series mobile platforms.
835 select ARCH_HAS_HOLES_MEMORYMODEL
836 select ARCH_REQUIRE_GPIOLIB
838 select GENERIC_ALLOCATOR
839 select GENERIC_CLOCKEVENTS
840 select GENERIC_IRQ_CHIP
842 select NEED_MACH_GPIO_H
846 Support for TI's DaVinci platform.
851 select ARCH_HAS_CPUFREQ
852 select ARCH_HAS_HOLES_MEMORYMODEL
854 select ARCH_REQUIRE_GPIOLIB
857 select GENERIC_CLOCKEVENTS
858 select GENERIC_IRQ_CHIP
862 select NEED_MACH_IO_H if PCCARD
863 select NEED_MACH_MEMORY_H
865 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
869 menu "Multiple platform selection"
870 depends on ARCH_MULTIPLATFORM
872 comment "CPU Core family selection"
875 bool "ARMv4 based platforms (FA526, StrongARM)"
876 depends on !ARCH_MULTI_V6_V7
877 select ARCH_MULTI_V4_V5
879 config ARCH_MULTI_V4T
880 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
881 depends on !ARCH_MULTI_V6_V7
882 select ARCH_MULTI_V4_V5
885 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
886 depends on !ARCH_MULTI_V6_V7
887 select ARCH_MULTI_V4_V5
889 config ARCH_MULTI_V4_V5
893 bool "ARMv6 based platforms (ARM11)"
894 select ARCH_MULTI_V6_V7
898 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
900 select ARCH_MULTI_V6_V7
903 config ARCH_MULTI_V6_V7
906 config ARCH_MULTI_CPU_AUTO
907 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
913 # This is sorted alphabetically by mach-* pathname. However, plat-*
914 # Kconfigs may be included either alphabetically (according to the
915 # plat- suffix) or along side the corresponding mach-* source.
917 source "arch/arm/mach-mvebu/Kconfig"
919 source "arch/arm/mach-at91/Kconfig"
921 source "arch/arm/mach-bcm/Kconfig"
923 source "arch/arm/mach-bcm2835/Kconfig"
925 source "arch/arm/mach-clps711x/Kconfig"
927 source "arch/arm/mach-cns3xxx/Kconfig"
929 source "arch/arm/mach-davinci/Kconfig"
931 source "arch/arm/mach-dove/Kconfig"
933 source "arch/arm/mach-ep93xx/Kconfig"
935 source "arch/arm/mach-footbridge/Kconfig"
937 source "arch/arm/mach-gemini/Kconfig"
939 source "arch/arm/mach-highbank/Kconfig"
941 source "arch/arm/mach-integrator/Kconfig"
943 source "arch/arm/mach-iop32x/Kconfig"
945 source "arch/arm/mach-iop33x/Kconfig"
947 source "arch/arm/mach-iop13xx/Kconfig"
949 source "arch/arm/mach-ixp4xx/Kconfig"
951 source "arch/arm/mach-kirkwood/Kconfig"
953 source "arch/arm/mach-ks8695/Kconfig"
955 source "arch/arm/mach-msm/Kconfig"
957 source "arch/arm/mach-mv78xx0/Kconfig"
959 source "arch/arm/mach-imx/Kconfig"
961 source "arch/arm/mach-mxs/Kconfig"
963 source "arch/arm/mach-netx/Kconfig"
965 source "arch/arm/mach-nomadik/Kconfig"
967 source "arch/arm/plat-omap/Kconfig"
969 source "arch/arm/mach-omap1/Kconfig"
971 source "arch/arm/mach-omap2/Kconfig"
973 source "arch/arm/mach-orion5x/Kconfig"
975 source "arch/arm/mach-picoxcell/Kconfig"
977 source "arch/arm/mach-pxa/Kconfig"
978 source "arch/arm/plat-pxa/Kconfig"
980 source "arch/arm/mach-mmp/Kconfig"
982 source "arch/arm/mach-realview/Kconfig"
984 source "arch/arm/mach-sa1100/Kconfig"
986 source "arch/arm/plat-samsung/Kconfig"
988 source "arch/arm/mach-socfpga/Kconfig"
990 source "arch/arm/mach-spear/Kconfig"
992 source "arch/arm/mach-s3c24xx/Kconfig"
995 source "arch/arm/mach-s3c64xx/Kconfig"
998 source "arch/arm/mach-s5p64x0/Kconfig"
1000 source "arch/arm/mach-s5pc100/Kconfig"
1002 source "arch/arm/mach-s5pv210/Kconfig"
1004 source "arch/arm/mach-exynos/Kconfig"
1006 source "arch/arm/mach-shmobile/Kconfig"
1008 source "arch/arm/mach-sunxi/Kconfig"
1010 source "arch/arm/mach-prima2/Kconfig"
1012 source "arch/arm/mach-tegra/Kconfig"
1014 source "arch/arm/mach-u300/Kconfig"
1016 source "arch/arm/mach-ux500/Kconfig"
1018 source "arch/arm/mach-versatile/Kconfig"
1020 source "arch/arm/mach-vexpress/Kconfig"
1021 source "arch/arm/plat-versatile/Kconfig"
1023 source "arch/arm/mach-virt/Kconfig"
1025 source "arch/arm/mach-vt8500/Kconfig"
1027 source "arch/arm/mach-w90x900/Kconfig"
1029 source "arch/arm/mach-zynq/Kconfig"
1031 # Definitions to make life easier
1037 select GENERIC_CLOCKEVENTS
1043 select GENERIC_IRQ_CHIP
1046 config PLAT_ORION_LEGACY
1053 config PLAT_VERSATILE
1056 config ARM_TIMER_SP804
1059 select CLKSRC_OF if OF
1061 source arch/arm/mm/Kconfig
1065 default 16 if ARCH_EP93XX
1069 bool "Enable iWMMXt support" if !CPU_PJ4
1070 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1071 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
1073 Enable support for iWMMXt context switching at run time if
1074 running on a CPU that supports it.
1078 depends on CPU_XSCALE
1081 config MULTI_IRQ_HANDLER
1084 Allow each machine to specify it's own IRQ handler at run time.
1087 source "arch/arm/Kconfig-nommu"
1090 config ARM_ERRATA_326103
1091 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1094 Executing a SWP instruction to read-only memory does not set bit 11
1095 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1096 treat the access as a read, preventing a COW from occurring and
1097 causing the faulting task to livelock.
1099 config ARM_ERRATA_411920
1100 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1101 depends on CPU_V6 || CPU_V6K
1103 Invalidation of the Instruction Cache operation can
1104 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1105 It does not affect the MPCore. This option enables the ARM Ltd.
1106 recommended workaround.
1108 config ARM_ERRATA_430973
1109 bool "ARM errata: Stale prediction on replaced interworking branch"
1112 This option enables the workaround for the 430973 Cortex-A8
1113 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1114 interworking branch is replaced with another code sequence at the
1115 same virtual address, whether due to self-modifying code or virtual
1116 to physical address re-mapping, Cortex-A8 does not recover from the
1117 stale interworking branch prediction. This results in Cortex-A8
1118 executing the new code sequence in the incorrect ARM or Thumb state.
1119 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1120 and also flushes the branch target cache at every context switch.
1121 Note that setting specific bits in the ACTLR register may not be
1122 available in non-secure mode.
1124 config ARM_ERRATA_458693
1125 bool "ARM errata: Processor deadlock when a false hazard is created"
1127 depends on !ARCH_MULTIPLATFORM
1129 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1130 erratum. For very specific sequences of memory operations, it is
1131 possible for a hazard condition intended for a cache line to instead
1132 be incorrectly associated with a different cache line. This false
1133 hazard might then cause a processor deadlock. The workaround enables
1134 the L1 caching of the NEON accesses and disables the PLD instruction
1135 in the ACTLR register. Note that setting specific bits in the ACTLR
1136 register may not be available in non-secure mode.
1138 config ARM_ERRATA_460075
1139 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1141 depends on !ARCH_MULTIPLATFORM
1143 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1144 erratum. Any asynchronous access to the L2 cache may encounter a
1145 situation in which recent store transactions to the L2 cache are lost
1146 and overwritten with stale memory contents from external memory. The
1147 workaround disables the write-allocate mode for the L2 cache via the
1148 ACTLR register. Note that setting specific bits in the ACTLR register
1149 may not be available in non-secure mode.
1151 config ARM_ERRATA_742230
1152 bool "ARM errata: DMB operation may be faulty"
1153 depends on CPU_V7 && SMP
1154 depends on !ARCH_MULTIPLATFORM
1156 This option enables the workaround for the 742230 Cortex-A9
1157 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1158 between two write operations may not ensure the correct visibility
1159 ordering of the two writes. This workaround sets a specific bit in
1160 the diagnostic register of the Cortex-A9 which causes the DMB
1161 instruction to behave as a DSB, ensuring the correct behaviour of
1164 config ARM_ERRATA_742231
1165 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1166 depends on CPU_V7 && SMP
1167 depends on !ARCH_MULTIPLATFORM
1169 This option enables the workaround for the 742231 Cortex-A9
1170 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1171 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1172 accessing some data located in the same cache line, may get corrupted
1173 data due to bad handling of the address hazard when the line gets
1174 replaced from one of the CPUs at the same time as another CPU is
1175 accessing it. This workaround sets specific bits in the diagnostic
1176 register of the Cortex-A9 which reduces the linefill issuing
1177 capabilities of the processor.
1179 config PL310_ERRATA_588369
1180 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1181 depends on CACHE_L2X0
1183 The PL310 L2 cache controller implements three types of Clean &
1184 Invalidate maintenance operations: by Physical Address
1185 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1186 They are architecturally defined to behave as the execution of a
1187 clean operation followed immediately by an invalidate operation,
1188 both performing to the same memory location. This functionality
1189 is not correctly implemented in PL310 as clean lines are not
1190 invalidated as a result of these operations.
1192 config ARM_ERRATA_720789
1193 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1196 This option enables the workaround for the 720789 Cortex-A9 (prior to
1197 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1198 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1199 As a consequence of this erratum, some TLB entries which should be
1200 invalidated are not, resulting in an incoherency in the system page
1201 tables. The workaround changes the TLB flushing routines to invalidate
1202 entries regardless of the ASID.
1204 config PL310_ERRATA_727915
1205 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1206 depends on CACHE_L2X0
1208 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1209 operation (offset 0x7FC). This operation runs in background so that
1210 PL310 can handle normal accesses while it is in progress. Under very
1211 rare circumstances, due to this erratum, write data can be lost when
1212 PL310 treats a cacheable write transaction during a Clean &
1213 Invalidate by Way operation.
1215 config ARM_ERRATA_743622
1216 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1218 depends on !ARCH_MULTIPLATFORM
1220 This option enables the workaround for the 743622 Cortex-A9
1221 (r2p*) erratum. Under very rare conditions, a faulty
1222 optimisation in the Cortex-A9 Store Buffer may lead to data
1223 corruption. This workaround sets a specific bit in the diagnostic
1224 register of the Cortex-A9 which disables the Store Buffer
1225 optimisation, preventing the defect from occurring. This has no
1226 visible impact on the overall performance or power consumption of the
1229 config ARM_ERRATA_751472
1230 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1232 depends on !ARCH_MULTIPLATFORM
1234 This option enables the workaround for the 751472 Cortex-A9 (prior
1235 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1236 completion of a following broadcasted operation if the second
1237 operation is received by a CPU before the ICIALLUIS has completed,
1238 potentially leading to corrupted entries in the cache or TLB.
1240 config PL310_ERRATA_753970
1241 bool "PL310 errata: cache sync operation may be faulty"
1242 depends on CACHE_PL310
1244 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1246 Under some condition the effect of cache sync operation on
1247 the store buffer still remains when the operation completes.
1248 This means that the store buffer is always asked to drain and
1249 this prevents it from merging any further writes. The workaround
1250 is to replace the normal offset of cache sync operation (0x730)
1251 by another offset targeting an unmapped PL310 register 0x740.
1252 This has the same effect as the cache sync operation: store buffer
1253 drain and waiting for all buffers empty.
1255 config ARM_ERRATA_754322
1256 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1259 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1260 r3p*) erratum. A speculative memory access may cause a page table walk
1261 which starts prior to an ASID switch but completes afterwards. This
1262 can populate the micro-TLB with a stale entry which may be hit with
1263 the new ASID. This workaround places two dsb instructions in the mm
1264 switching code so that no page table walks can cross the ASID switch.
1266 config ARM_ERRATA_754327
1267 bool "ARM errata: no automatic Store Buffer drain"
1268 depends on CPU_V7 && SMP
1270 This option enables the workaround for the 754327 Cortex-A9 (prior to
1271 r2p0) erratum. The Store Buffer does not have any automatic draining
1272 mechanism and therefore a livelock may occur if an external agent
1273 continuously polls a memory location waiting to observe an update.
1274 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1275 written polling loops from denying visibility of updates to memory.
1277 config ARM_ERRATA_364296
1278 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1279 depends on CPU_V6 && !SMP
1281 This options enables the workaround for the 364296 ARM1136
1282 r0p2 erratum (possible cache data corruption with
1283 hit-under-miss enabled). It sets the undocumented bit 31 in
1284 the auxiliary control register and the FI bit in the control
1285 register, thus disabling hit-under-miss without putting the
1286 processor into full low interrupt latency mode. ARM11MPCore
1289 config ARM_ERRATA_764369
1290 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1291 depends on CPU_V7 && SMP
1293 This option enables the workaround for erratum 764369
1294 affecting Cortex-A9 MPCore with two or more processors (all
1295 current revisions). Under certain timing circumstances, a data
1296 cache line maintenance operation by MVA targeting an Inner
1297 Shareable memory region may fail to proceed up to either the
1298 Point of Coherency or to the Point of Unification of the
1299 system. This workaround adds a DSB instruction before the
1300 relevant cache maintenance functions and sets a specific bit
1301 in the diagnostic control register of the SCU.
1303 config PL310_ERRATA_769419
1304 bool "PL310 errata: no automatic Store Buffer drain"
1305 depends on CACHE_L2X0
1307 On revisions of the PL310 prior to r3p2, the Store Buffer does
1308 not automatically drain. This can cause normal, non-cacheable
1309 writes to be retained when the memory system is idle, leading
1310 to suboptimal I/O performance for drivers using coherent DMA.
1311 This option adds a write barrier to the cpu_idle loop so that,
1312 on systems with an outer cache, the store buffer is drained
1315 config ARM_ERRATA_775420
1316 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1319 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1320 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1321 operation aborts with MMU exception, it might cause the processor
1322 to deadlock. This workaround puts DSB before executing ISB if
1323 an abort may occur on cache maintenance.
1325 config ARM_ERRATA_798181
1326 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1327 depends on CPU_V7 && SMP
1329 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1330 adequately shooting down all use of the old entries. This
1331 option enables the Linux kernel workaround for this erratum
1332 which sends an IPI to the CPUs that are running the same ASID
1333 as the one being invalidated.
1337 source "arch/arm/common/Kconfig"
1347 Find out whether you have ISA slots on your motherboard. ISA is the
1348 name of a bus system, i.e. the way the CPU talks to the other stuff
1349 inside your box. Other bus systems are PCI, EISA, MicroChannel
1350 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1351 newer boards don't support it. If you have ISA, say Y, otherwise N.
1353 # Select ISA DMA controller support
1358 # Select ISA DMA interface
1363 bool "PCI support" if MIGHT_HAVE_PCI
1365 Find out whether you have a PCI motherboard. PCI is the name of a
1366 bus system, i.e. the way the CPU talks to the other stuff inside
1367 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1368 VESA. If you have PCI, say Y, otherwise N.
1374 config PCI_NANOENGINE
1375 bool "BSE nanoEngine PCI support"
1376 depends on SA1100_NANOENGINE
1378 Enable PCI on the BSE nanoEngine board.
1383 # Select the host bridge type
1384 config PCI_HOST_VIA82C505
1386 depends on PCI && ARCH_SHARK
1389 config PCI_HOST_ITE8152
1391 depends on PCI && MACH_ARMCORE
1395 source "drivers/pci/Kconfig"
1397 source "drivers/pcmcia/Kconfig"
1401 menu "Kernel Features"
1406 This option should be selected by machines which have an SMP-
1409 The only effect of this option is to make the SMP-related
1410 options available to the user for configuration.
1413 bool "Symmetric Multi-Processing"
1414 depends on CPU_V6K || CPU_V7
1415 depends on GENERIC_CLOCKEVENTS
1418 select USE_GENERIC_SMP_HELPERS
1420 This enables support for systems with more than one CPU. If you have
1421 a system with only one CPU, like most personal computers, say N. If
1422 you have a system with more than one CPU, say Y.
1424 If you say N here, the kernel will run on single and multiprocessor
1425 machines, but will use only one CPU of a multiprocessor machine. If
1426 you say Y here, the kernel will run on many, but not all, single
1427 processor machines. On a single processor machine, the kernel will
1428 run faster if you say N here.
1430 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1431 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1432 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1434 If you don't know what to do here, say N.
1437 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1438 depends on SMP && !XIP_KERNEL
1441 SMP kernels contain instructions which fail on non-SMP processors.
1442 Enabling this option allows the kernel to modify itself to make
1443 these instructions safe. Disabling it allows about 1K of space
1446 If you don't know what to do here, say Y.
1448 config ARM_CPU_TOPOLOGY
1449 bool "Support cpu topology definition"
1450 depends on SMP && CPU_V7
1453 Support ARM cpu topology definition. The MPIDR register defines
1454 affinity between processors which is then used to describe the cpu
1455 topology of an ARM System.
1458 bool "Multi-core scheduler support"
1459 depends on ARM_CPU_TOPOLOGY
1461 Multi-core scheduler support improves the CPU scheduler's decision
1462 making when dealing with multi-core CPU chips at a cost of slightly
1463 increased overhead in some places. If unsure say N here.
1466 bool "SMT scheduler support"
1467 depends on ARM_CPU_TOPOLOGY
1469 Improves the CPU scheduler's decision making when dealing with
1470 MultiThreading at a cost of slightly increased overhead in some
1471 places. If unsure say N here.
1476 This option enables support for the ARM system coherency unit
1478 config HAVE_ARM_ARCH_TIMER
1479 bool "Architected timer support"
1481 select ARM_ARCH_TIMER
1483 This option enables support for the ARM architected timer
1488 select CLKSRC_OF if OF
1490 This options enables support for the ARM timer and watchdog unit
1493 bool "Multi-Cluster Power Management"
1494 depends on CPU_V7 && SMP
1496 This option provides the common power management infrastructure
1497 for (multi-)cluster based systems, such as big.LITTLE based
1501 prompt "Memory split"
1504 Select the desired split between kernel and user memory.
1506 If you are not absolutely sure what you are doing, leave this
1510 bool "3G/1G user/kernel split"
1512 bool "2G/2G user/kernel split"
1514 bool "1G/3G user/kernel split"
1519 default 0x40000000 if VMSPLIT_1G
1520 default 0x80000000 if VMSPLIT_2G
1524 int "Maximum number of CPUs (2-32)"
1530 bool "Support for hot-pluggable CPUs"
1531 depends on SMP && HOTPLUG
1533 Say Y here to experiment with turning CPUs off and on. CPUs
1534 can be controlled through /sys/devices/system/cpu.
1537 bool "Support for the ARM Power State Coordination Interface (PSCI)"
1540 Say Y here if you want Linux to communicate with system firmware
1541 implementing the PSCI specification for CPU-centric power
1542 management operations described in ARM document number ARM DEN
1543 0022A ("Power State Coordination Interface System Software on
1547 bool "Use local timer interrupts"
1551 Enable support for local timers on SMP platforms, rather then the
1552 legacy IPI broadcast method. Local timers allows the system
1553 accounting to be spread across the timer interval, preventing a
1554 "thundering herd" at every timer tick.
1556 # The GPIO number here must be sorted by descending number. In case of
1557 # a multiplatform kernel, we just want the highest value required by the
1558 # selected platforms.
1561 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1562 default 512 if SOC_OMAP5
1563 default 392 if ARCH_U8500
1564 default 352 if ARCH_VT8500
1565 default 288 if ARCH_SUNXI
1566 default 264 if MACH_H4700
1569 Maximum number of GPIOs in the system.
1571 If unsure, leave the default value.
1573 source kernel/Kconfig.preempt
1577 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1578 ARCH_S5PV210 || ARCH_EXYNOS4
1579 default AT91_TIMER_HZ if ARCH_AT91
1580 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1584 def_bool HIGH_RES_TIMERS
1586 config THUMB2_KERNEL
1587 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1588 depends on CPU_V7 && !CPU_V6 && !CPU_V6K
1589 default y if CPU_THUMBONLY
1591 select ARM_ASM_UNIFIED
1594 By enabling this option, the kernel will be compiled in
1595 Thumb-2 mode. A compiler/assembler that understand the unified
1596 ARM-Thumb syntax is needed.
1600 config THUMB2_AVOID_R_ARM_THM_JUMP11
1601 bool "Work around buggy Thumb-2 short branch relocations in gas"
1602 depends on THUMB2_KERNEL && MODULES
1605 Various binutils versions can resolve Thumb-2 branches to
1606 locally-defined, preemptible global symbols as short-range "b.n"
1607 branch instructions.
1609 This is a problem, because there's no guarantee the final
1610 destination of the symbol, or any candidate locations for a
1611 trampoline, are within range of the branch. For this reason, the
1612 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1613 relocation in modules at all, and it makes little sense to add
1616 The symptom is that the kernel fails with an "unsupported
1617 relocation" error when loading some modules.
1619 Until fixed tools are available, passing
1620 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1621 code which hits this problem, at the cost of a bit of extra runtime
1622 stack usage in some cases.
1624 The problem is described in more detail at:
1625 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1627 Only Thumb-2 kernels are affected.
1629 Unless you are sure your tools don't have this problem, say Y.
1631 config ARM_ASM_UNIFIED
1635 bool "Use the ARM EABI to compile the kernel"
1637 This option allows for the kernel to be compiled using the latest
1638 ARM ABI (aka EABI). This is only useful if you are using a user
1639 space environment that is also compiled with EABI.
1641 Since there are major incompatibilities between the legacy ABI and
1642 EABI, especially with regard to structure member alignment, this
1643 option also changes the kernel syscall calling convention to
1644 disambiguate both ABIs and allow for backward compatibility support
1645 (selected with CONFIG_OABI_COMPAT).
1647 To use this you need GCC version 4.0.0 or later.
1650 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1651 depends on AEABI && !THUMB2_KERNEL
1654 This option preserves the old syscall interface along with the
1655 new (ARM EABI) one. It also provides a compatibility layer to
1656 intercept syscalls that have structure arguments which layout
1657 in memory differs between the legacy ABI and the new ARM EABI
1658 (only for non "thumb" binaries). This option adds a tiny
1659 overhead to all syscalls and produces a slightly larger kernel.
1660 If you know you'll be using only pure EABI user space then you
1661 can say N here. If this option is not selected and you attempt
1662 to execute a legacy ABI binary then the result will be
1663 UNPREDICTABLE (in fact it can be predicted that it won't work
1664 at all). If in doubt say Y.
1666 config ARCH_HAS_HOLES_MEMORYMODEL
1669 config ARCH_SPARSEMEM_ENABLE
1672 config ARCH_SPARSEMEM_DEFAULT
1673 def_bool ARCH_SPARSEMEM_ENABLE
1675 config ARCH_SELECT_MEMORY_MODEL
1676 def_bool ARCH_SPARSEMEM_ENABLE
1678 config HAVE_ARCH_PFN_VALID
1679 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1682 bool "High Memory Support"
1685 The address space of ARM processors is only 4 Gigabytes large
1686 and it has to accommodate user address space, kernel address
1687 space as well as some memory mapped IO. That means that, if you
1688 have a large amount of physical memory and/or IO, not all of the
1689 memory can be "permanently mapped" by the kernel. The physical
1690 memory that is not permanently mapped is called "high memory".
1692 Depending on the selected kernel/user memory split, minimum
1693 vmalloc space and actual amount of RAM, you may not need this
1694 option which should result in a slightly faster kernel.
1699 bool "Allocate 2nd-level pagetables from highmem"
1702 config HW_PERF_EVENTS
1703 bool "Enable hardware performance counter support for perf events"
1704 depends on PERF_EVENTS
1707 Enable hardware performance counter support for perf events. If
1708 disabled, perf events will use software events only.
1712 config FORCE_MAX_ZONEORDER
1713 int "Maximum zone order" if ARCH_SHMOBILE
1714 range 11 64 if ARCH_SHMOBILE
1715 default "12" if SOC_AM33XX
1716 default "9" if SA1111
1719 The kernel memory allocator divides physically contiguous memory
1720 blocks into "zones", where each zone is a power of two number of
1721 pages. This option selects the largest power of two that the kernel
1722 keeps in the memory allocator. If you need to allocate very large
1723 blocks of physically contiguous memory, then you may need to
1724 increase this value.
1726 This config option is actually maximum order plus one. For example,
1727 a value of 11 means that the largest free memory block is 2^10 pages.
1729 config ALIGNMENT_TRAP
1731 depends on CPU_CP15_MMU
1732 default y if !ARCH_EBSA110
1733 select HAVE_PROC_CPU if PROC_FS
1735 ARM processors cannot fetch/store information which is not
1736 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1737 address divisible by 4. On 32-bit ARM processors, these non-aligned
1738 fetch/store instructions will be emulated in software if you say
1739 here, which has a severe performance impact. This is necessary for
1740 correct operation of some network protocols. With an IP-only
1741 configuration it is safe to say N, otherwise say Y.
1743 config UACCESS_WITH_MEMCPY
1744 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1746 default y if CPU_FEROCEON
1748 Implement faster copy_to_user and clear_user methods for CPU
1749 cores where a 8-word STM instruction give significantly higher
1750 memory write throughput than a sequence of individual 32bit stores.
1752 A possible side effect is a slight increase in scheduling latency
1753 between threads sharing the same address space if they invoke
1754 such copy operations with large buffers.
1756 However, if the CPU data cache is using a write-allocate mode,
1757 this option is unlikely to provide any performance gain.
1761 prompt "Enable seccomp to safely compute untrusted bytecode"
1763 This kernel feature is useful for number crunching applications
1764 that may need to compute untrusted bytecode during their
1765 execution. By using pipes or other transports made available to
1766 the process as file descriptors supporting the read/write
1767 syscalls, it's possible to isolate those applications in
1768 their own address space using seccomp. Once seccomp is
1769 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1770 and the task is only allowed to execute a few safe syscalls
1771 defined by each seccomp mode.
1773 config CC_STACKPROTECTOR
1774 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1776 This option turns on the -fstack-protector GCC feature. This
1777 feature puts, at the beginning of functions, a canary value on
1778 the stack just before the return address, and validates
1779 the value just before actually returning. Stack based buffer
1780 overflows (that need to overwrite this return address) now also
1781 overwrite the canary, which gets detected and the attack is then
1782 neutralized via a kernel panic.
1783 This feature requires gcc version 4.2 or above.
1790 bool "Xen guest support on ARM (EXPERIMENTAL)"
1791 depends on ARM && AEABI && OF
1792 depends on CPU_V7 && !CPU_V6
1793 depends on !GENERIC_ATOMIC64
1796 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1803 bool "Flattened Device Tree support"
1806 select OF_EARLY_FLATTREE
1808 Include support for flattened device tree machine descriptions.
1811 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1814 This is the traditional way of passing data to the kernel at boot
1815 time. If you are solely relying on the flattened device tree (or
1816 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1817 to remove ATAGS support from your kernel binary. If unsure,
1820 config DEPRECATED_PARAM_STRUCT
1821 bool "Provide old way to pass kernel parameters"
1824 This was deprecated in 2001 and announced to live on for 5 years.
1825 Some old boot loaders still use this way.
1827 # Compressed boot loader in ROM. Yes, we really want to ask about
1828 # TEXT and BSS so we preserve their values in the config files.
1829 config ZBOOT_ROM_TEXT
1830 hex "Compressed ROM boot loader base address"
1833 The physical address at which the ROM-able zImage is to be
1834 placed in the target. Platforms which normally make use of
1835 ROM-able zImage formats normally set this to a suitable
1836 value in their defconfig file.
1838 If ZBOOT_ROM is not enabled, this has no effect.
1840 config ZBOOT_ROM_BSS
1841 hex "Compressed ROM boot loader BSS address"
1844 The base address of an area of read/write memory in the target
1845 for the ROM-able zImage which must be available while the
1846 decompressor is running. It must be large enough to hold the
1847 entire decompressed kernel plus an additional 128 KiB.
1848 Platforms which normally make use of ROM-able zImage formats
1849 normally set this to a suitable value in their defconfig file.
1851 If ZBOOT_ROM is not enabled, this has no effect.
1854 bool "Compressed boot loader in ROM/flash"
1855 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1857 Say Y here if you intend to execute your compressed kernel image
1858 (zImage) directly from ROM or flash. If unsure, say N.
1861 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1862 depends on ZBOOT_ROM && ARCH_SH7372
1863 default ZBOOT_ROM_NONE
1865 Include experimental SD/MMC loading code in the ROM-able zImage.
1866 With this enabled it is possible to write the ROM-able zImage
1867 kernel image to an MMC or SD card and boot the kernel straight
1868 from the reset vector. At reset the processor Mask ROM will load
1869 the first part of the ROM-able zImage which in turn loads the
1870 rest the kernel image to RAM.
1872 config ZBOOT_ROM_NONE
1873 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1875 Do not load image from SD or MMC
1877 config ZBOOT_ROM_MMCIF
1878 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1880 Load image from MMCIF hardware block.
1882 config ZBOOT_ROM_SH_MOBILE_SDHI
1883 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1885 Load image from SDHI hardware block
1889 config ARM_APPENDED_DTB
1890 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1891 depends on OF && !ZBOOT_ROM
1893 With this option, the boot code will look for a device tree binary
1894 (DTB) appended to zImage
1895 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1897 This is meant as a backward compatibility convenience for those
1898 systems with a bootloader that can't be upgraded to accommodate
1899 the documented boot protocol using a device tree.
1901 Beware that there is very little in terms of protection against
1902 this option being confused by leftover garbage in memory that might
1903 look like a DTB header after a reboot if no actual DTB is appended
1904 to zImage. Do not leave this option active in a production kernel
1905 if you don't intend to always append a DTB. Proper passing of the
1906 location into r2 of a bootloader provided DTB is always preferable
1909 config ARM_ATAG_DTB_COMPAT
1910 bool "Supplement the appended DTB with traditional ATAG information"
1911 depends on ARM_APPENDED_DTB
1913 Some old bootloaders can't be updated to a DTB capable one, yet
1914 they provide ATAGs with memory configuration, the ramdisk address,
1915 the kernel cmdline string, etc. Such information is dynamically
1916 provided by the bootloader and can't always be stored in a static
1917 DTB. To allow a device tree enabled kernel to be used with such
1918 bootloaders, this option allows zImage to extract the information
1919 from the ATAG list and store it at run time into the appended DTB.
1922 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1923 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1925 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1926 bool "Use bootloader kernel arguments if available"
1928 Uses the command-line options passed by the boot loader instead of
1929 the device tree bootargs property. If the boot loader doesn't provide
1930 any, the device tree bootargs property will be used.
1932 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1933 bool "Extend with bootloader kernel arguments"
1935 The command-line arguments provided by the boot loader will be
1936 appended to the the device tree bootargs property.
1941 string "Default kernel command string"
1944 On some architectures (EBSA110 and CATS), there is currently no way
1945 for the boot loader to pass arguments to the kernel. For these
1946 architectures, you should supply some command-line options at build
1947 time by entering them here. As a minimum, you should specify the
1948 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1951 prompt "Kernel command line type" if CMDLINE != ""
1952 default CMDLINE_FROM_BOOTLOADER
1955 config CMDLINE_FROM_BOOTLOADER
1956 bool "Use bootloader kernel arguments if available"
1958 Uses the command-line options passed by the boot loader. If
1959 the boot loader doesn't provide any, the default kernel command
1960 string provided in CMDLINE will be used.
1962 config CMDLINE_EXTEND
1963 bool "Extend bootloader kernel arguments"
1965 The command-line arguments provided by the boot loader will be
1966 appended to the default kernel command string.
1968 config CMDLINE_FORCE
1969 bool "Always use the default kernel command string"
1971 Always use the default kernel command string, even if the boot
1972 loader passes other arguments to the kernel.
1973 This is useful if you cannot or don't want to change the
1974 command-line options your boot loader passes to the kernel.
1978 bool "Kernel Execute-In-Place from ROM"
1979 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
1981 Execute-In-Place allows the kernel to run from non-volatile storage
1982 directly addressable by the CPU, such as NOR flash. This saves RAM
1983 space since the text section of the kernel is not loaded from flash
1984 to RAM. Read-write sections, such as the data section and stack,
1985 are still copied to RAM. The XIP kernel is not compressed since
1986 it has to run directly from flash, so it will take more space to
1987 store it. The flash address used to link the kernel object files,
1988 and for storing it, is configuration dependent. Therefore, if you
1989 say Y here, you must know the proper physical address where to
1990 store the kernel image depending on your own flash memory usage.
1992 Also note that the make target becomes "make xipImage" rather than
1993 "make zImage" or "make Image". The final kernel binary to put in
1994 ROM memory will be arch/arm/boot/xipImage.
1998 config XIP_PHYS_ADDR
1999 hex "XIP Kernel Physical Location"
2000 depends on XIP_KERNEL
2001 default "0x00080000"
2003 This is the physical address in your flash memory the kernel will
2004 be linked for and stored to. This address is dependent on your
2008 bool "Kexec system call (EXPERIMENTAL)"
2009 depends on (!SMP || HOTPLUG_CPU)
2011 kexec is a system call that implements the ability to shutdown your
2012 current kernel, and to start another kernel. It is like a reboot
2013 but it is independent of the system firmware. And like a reboot
2014 you can start any kernel with it, not just Linux.
2016 It is an ongoing process to be certain the hardware in a machine
2017 is properly shutdown, so do not be surprised if this code does not
2018 initially work for you. It may help to enable device hotplugging
2022 bool "Export atags in procfs"
2023 depends on ATAGS && KEXEC
2026 Should the atags used to boot the kernel be exported in an "atags"
2027 file in procfs. Useful with kexec.
2030 bool "Build kdump crash kernel (EXPERIMENTAL)"
2032 Generate crash dump after being started by kexec. This should
2033 be normally only set in special crash dump kernels which are
2034 loaded in the main kernel with kexec-tools into a specially
2035 reserved region and then later executed after a crash by
2036 kdump/kexec. The crash dump kernel must be compiled to a
2037 memory address not used by the main kernel
2039 For more details see Documentation/kdump/kdump.txt
2041 config AUTO_ZRELADDR
2042 bool "Auto calculation of the decompressed kernel image address"
2043 depends on !ZBOOT_ROM && !ARCH_U300
2045 ZRELADDR is the physical address where the decompressed kernel
2046 image will be placed. If AUTO_ZRELADDR is selected, the address
2047 will be determined at run-time by masking the current IP with
2048 0xf8000000. This assumes the zImage being placed in the first 128MB
2049 from start of memory.
2053 menu "CPU Power Management"
2056 source "drivers/cpufreq/Kconfig"
2061 Internal configuration node for common cpufreq on Samsung SoC
2063 config CPU_FREQ_S3C24XX
2064 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2065 depends on ARCH_S3C24XX && CPU_FREQ
2068 This enables the CPUfreq driver for the Samsung S3C24XX family
2071 For details, take a look at <file:Documentation/cpu-freq>.
2075 config CPU_FREQ_S3C24XX_PLL
2076 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2077 depends on CPU_FREQ_S3C24XX
2079 Compile in support for changing the PLL frequency from the
2080 S3C24XX series CPUfreq driver. The PLL takes time to settle
2081 after a frequency change, so by default it is not enabled.
2083 This also means that the PLL tables for the selected CPU(s) will
2084 be built which may increase the size of the kernel image.
2086 config CPU_FREQ_S3C24XX_DEBUG
2087 bool "Debug CPUfreq Samsung driver core"
2088 depends on CPU_FREQ_S3C24XX
2090 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2092 config CPU_FREQ_S3C24XX_IODEBUG
2093 bool "Debug CPUfreq Samsung driver IO timing"
2094 depends on CPU_FREQ_S3C24XX
2096 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2098 config CPU_FREQ_S3C24XX_DEBUGFS
2099 bool "Export debugfs for CPUFreq"
2100 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2102 Export status information via debugfs.
2106 source "drivers/cpuidle/Kconfig"
2110 menu "Floating point emulation"
2112 comment "At least one emulation must be selected"
2115 bool "NWFPE math emulation"
2116 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2118 Say Y to include the NWFPE floating point emulator in the kernel.
2119 This is necessary to run most binaries. Linux does not currently
2120 support floating point hardware so you need to say Y here even if
2121 your machine has an FPA or floating point co-processor podule.
2123 You may say N here if you are going to load the Acorn FPEmulator
2124 early in the bootup.
2127 bool "Support extended precision"
2128 depends on FPE_NWFPE
2130 Say Y to include 80-bit support in the kernel floating-point
2131 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2132 Note that gcc does not generate 80-bit operations by default,
2133 so in most cases this option only enlarges the size of the
2134 floating point emulator without any good reason.
2136 You almost surely want to say N here.
2139 bool "FastFPE math emulation (EXPERIMENTAL)"
2140 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
2142 Say Y here to include the FAST floating point emulator in the kernel.
2143 This is an experimental much faster emulator which now also has full
2144 precision for the mantissa. It does not support any exceptions.
2145 It is very simple, and approximately 3-6 times faster than NWFPE.
2147 It should be sufficient for most programs. It may be not suitable
2148 for scientific calculations, but you have to check this for yourself.
2149 If you do not feel you need a faster FP emulation you should better
2153 bool "VFP-format floating point maths"
2154 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2156 Say Y to include VFP support code in the kernel. This is needed
2157 if your hardware includes a VFP unit.
2159 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2160 release notes and additional status information.
2162 Say N if your target does not have VFP hardware.
2170 bool "Advanced SIMD (NEON) Extension support"
2171 depends on VFPv3 && CPU_V7
2173 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2178 menu "Userspace binary formats"
2180 source "fs/Kconfig.binfmt"
2183 tristate "RISC OS personality"
2186 Say Y here to include the kernel code necessary if you want to run
2187 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2188 experimental; if this sounds frightening, say N and sleep in peace.
2189 You can also say M here to compile this support as a module (which
2190 will be called arthur).
2194 menu "Power management options"
2196 source "kernel/power/Kconfig"
2198 config ARCH_SUSPEND_POSSIBLE
2199 depends on !ARCH_S5PC100
2200 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2201 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2204 config ARM_CPU_SUSPEND
2209 source "net/Kconfig"
2211 source "drivers/Kconfig"
2215 source "arch/arm/Kconfig.debug"
2217 source "security/Kconfig"
2219 source "crypto/Kconfig"
2221 source "lib/Kconfig"
2223 source "arch/arm/kvm/Kconfig"