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_WANT_IPC_PARSE_VERSION
8 select CPU_PM if (SUSPEND || CPU_IDLE)
9 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN
10 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
11 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
12 select GENERIC_IRQ_PROBE
13 select GENERIC_IRQ_SHOW
14 select GENERIC_KERNEL_THREAD
15 select GENERIC_PCI_IOMAP
16 select GENERIC_SMP_IDLE_THREAD
17 select GENERIC_STRNCPY_FROM_USER
18 select GENERIC_STRNLEN_USER
19 select HARDIRQS_SW_RESEND
21 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
23 select HAVE_ARCH_TRACEHOOK
25 select HAVE_C_RECORDMCOUNT
26 select HAVE_DEBUG_KMEMLEAK
27 select HAVE_DMA_API_DEBUG
29 select HAVE_DMA_CONTIGUOUS if MMU
30 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
31 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
32 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
33 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
34 select HAVE_GENERIC_DMA_COHERENT
35 select HAVE_GENERIC_HARDIRQS
36 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
37 select HAVE_IDE if PCI || ISA || PCMCIA
39 select HAVE_KERNEL_GZIP
40 select HAVE_KERNEL_LZMA
41 select HAVE_KERNEL_LZO
43 select HAVE_KPROBES if !XIP_KERNEL
44 select HAVE_KRETPROBES if (HAVE_KPROBES)
46 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
47 select HAVE_PERF_EVENTS
48 select HAVE_REGS_AND_STACK_ACCESS_API
49 select HAVE_SYSCALL_TRACEPOINTS
52 select PERF_USE_VMALLOC
54 select SYS_SUPPORTS_APM_EMULATION
56 The ARM series is a line of low-power-consumption RISC chip designs
57 licensed by ARM Ltd and targeted at embedded applications and
58 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
59 manufactured, but legacy ARM-based PC hardware remains popular in
60 Europe. There is an ARM Linux project with a web page at
61 <http://www.arm.linux.org.uk/>.
63 config ARM_HAS_SG_CHAIN
66 config NEED_SG_DMA_LENGTH
69 config ARM_DMA_USE_IOMMU
71 select ARM_HAS_SG_CHAIN
72 select NEED_SG_DMA_LENGTH
80 config SYS_SUPPORTS_APM_EMULATION
88 select GENERIC_ALLOCATOR
99 The Extended Industry Standard Architecture (EISA) bus was
100 developed as an open alternative to the IBM MicroChannel bus.
102 The EISA bus provided some of the features of the IBM MicroChannel
103 bus while maintaining backward compatibility with cards made for
104 the older ISA bus. The EISA bus saw limited use between 1988 and
105 1995 when it was made obsolete by the PCI bus.
107 Say Y here if you are building a kernel for an EISA-based machine.
114 config STACKTRACE_SUPPORT
118 config HAVE_LATENCYTOP_SUPPORT
123 config LOCKDEP_SUPPORT
127 config TRACE_IRQFLAGS_SUPPORT
131 config RWSEM_GENERIC_SPINLOCK
135 config RWSEM_XCHGADD_ALGORITHM
138 config ARCH_HAS_ILOG2_U32
141 config ARCH_HAS_ILOG2_U64
144 config ARCH_HAS_CPUFREQ
147 Internal node to signify that the ARCH has CPUFREQ support
148 and that the relevant menu configurations are displayed for
151 config GENERIC_HWEIGHT
155 config GENERIC_CALIBRATE_DELAY
159 config ARCH_MAY_HAVE_PC_FDC
165 config NEED_DMA_MAP_STATE
168 config ARCH_HAS_DMA_SET_COHERENT_MASK
171 config GENERIC_ISA_DMA
177 config NEED_RET_TO_USER
185 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
186 default DRAM_BASE if REMAP_VECTORS_TO_RAM
189 The base address of exception vectors.
191 config ARM_PATCH_PHYS_VIRT
192 bool "Patch physical to virtual translations at runtime" if EMBEDDED
194 depends on !XIP_KERNEL && MMU
195 depends on !ARCH_REALVIEW || !SPARSEMEM
197 Patch phys-to-virt and virt-to-phys translation functions at
198 boot and module load time according to the position of the
199 kernel in system memory.
201 This can only be used with non-XIP MMU kernels where the base
202 of physical memory is at a 16MB boundary.
204 Only disable this option if you know that you do not require
205 this feature (eg, building a kernel for a single machine) and
206 you need to shrink the kernel to the minimal size.
208 config NEED_MACH_GPIO_H
211 Select this when mach/gpio.h is required to provide special
212 definitions for this platform. The need for mach/gpio.h should
213 be avoided when possible.
215 config NEED_MACH_IO_H
218 Select this when mach/io.h is required to provide special
219 definitions for this platform. The need for mach/io.h should
220 be avoided when possible.
222 config NEED_MACH_MEMORY_H
225 Select this when mach/memory.h is required to provide special
226 definitions for this platform. The need for mach/memory.h should
227 be avoided when possible.
230 hex "Physical address of main memory" if MMU
231 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
232 default DRAM_BASE if !MMU
234 Please provide the physical address corresponding to the
235 location of main memory in your system.
241 source "init/Kconfig"
243 source "kernel/Kconfig.freezer"
248 bool "MMU-based Paged Memory Management Support"
251 Select if you want MMU-based virtualised addressing space
252 support by paged memory management. If unsure, say 'Y'.
255 # The "ARM system type" choice list is ordered alphabetically by option
256 # text. Please add new entries in the option alphabetic order.
259 prompt "ARM system type"
260 default ARCH_MULTIPLATFORM
262 config ARCH_MULTIPLATFORM
263 bool "Allow multiple platforms to be selected"
265 select ARM_PATCH_PHYS_VIRT
268 select MULTI_IRQ_HANDLER
272 config ARCH_INTEGRATOR
273 bool "ARM Ltd. Integrator family"
274 select ARCH_HAS_CPUFREQ
277 select COMMON_CLK_VERSATILE
278 select GENERIC_CLOCKEVENTS
281 select MULTI_IRQ_HANDLER
282 select NEED_MACH_MEMORY_H
283 select PLAT_VERSATILE
284 select PLAT_VERSATILE_FPGA_IRQ
287 Support for ARM's Integrator platform.
290 bool "ARM Ltd. RealView family"
291 select ARCH_WANT_OPTIONAL_GPIOLIB
293 select ARM_TIMER_SP804
295 select COMMON_CLK_VERSATILE
296 select GENERIC_CLOCKEVENTS
297 select GPIO_PL061 if GPIOLIB
299 select NEED_MACH_MEMORY_H
300 select PLAT_VERSATILE
301 select PLAT_VERSATILE_CLCD
303 This enables support for ARM Ltd RealView boards.
305 config ARCH_VERSATILE
306 bool "ARM Ltd. Versatile family"
307 select ARCH_WANT_OPTIONAL_GPIOLIB
309 select ARM_TIMER_SP804
312 select GENERIC_CLOCKEVENTS
313 select HAVE_MACH_CLKDEV
315 select PLAT_VERSATILE
316 select PLAT_VERSATILE_CLCD
317 select PLAT_VERSATILE_CLOCK
318 select PLAT_VERSATILE_FPGA_IRQ
320 This enables support for ARM Ltd Versatile board.
324 select ARCH_REQUIRE_GPIOLIB
328 select NEED_MACH_GPIO_H
329 select NEED_MACH_IO_H if PCCARD
331 This enables support for systems based on Atmel
332 AT91RM9200 and AT91SAM9* processors.
335 bool "Broadcom BCM2835 family"
336 select ARCH_WANT_OPTIONAL_GPIOLIB
338 select ARM_ERRATA_411920
339 select ARM_TIMER_SP804
343 select GENERIC_CLOCKEVENTS
344 select MULTI_IRQ_HANDLER
348 This enables support for the Broadcom BCM2835 SoC. This SoC is
349 use in the Raspberry Pi, and Roku 2 devices.
352 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
353 select ARCH_USES_GETTIMEOFFSET
357 select NEED_MACH_MEMORY_H
359 Support for Cirrus Logic 711x/721x/731x based boards.
362 bool "Cavium Networks CNS3XXX family"
365 select GENERIC_CLOCKEVENTS
366 select MIGHT_HAVE_CACHE_L2X0
367 select MIGHT_HAVE_PCI
368 select PCI_DOMAINS if PCI
370 Support for Cavium Networks CNS3XXX platform.
373 bool "Cortina Systems Gemini"
374 select ARCH_REQUIRE_GPIOLIB
375 select ARCH_USES_GETTIMEOFFSET
378 Support for the Cortina Systems Gemini family SoCs
382 select ARCH_REQUIRE_GPIOLIB
384 select GENERIC_CLOCKEVENTS
385 select GENERIC_IRQ_CHIP
386 select MIGHT_HAVE_CACHE_L2X0
392 Support for CSR SiRFprimaII/Marco/Polo platforms
396 select ARCH_USES_GETTIMEOFFSET
399 select NEED_MACH_IO_H
400 select NEED_MACH_MEMORY_H
403 This is an evaluation board for the StrongARM processor available
404 from Digital. It has limited hardware on-board, including an
405 Ethernet interface, two PCMCIA sockets, two serial ports and a
410 select ARCH_HAS_HOLES_MEMORYMODEL
411 select ARCH_REQUIRE_GPIOLIB
412 select ARCH_USES_GETTIMEOFFSET
417 select NEED_MACH_MEMORY_H
419 This enables support for the Cirrus EP93xx series of CPUs.
421 config ARCH_FOOTBRIDGE
425 select GENERIC_CLOCKEVENTS
427 select NEED_MACH_IO_H if !MMU
428 select NEED_MACH_MEMORY_H
430 Support for systems based on the DC21285 companion chip
431 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
434 bool "Freescale MXC/iMX-based"
435 select ARCH_REQUIRE_GPIOLIB
438 select GENERIC_CLOCKEVENTS
439 select GENERIC_IRQ_CHIP
440 select MULTI_IRQ_HANDLER
444 Support for Freescale MXC/iMX-based family of processors
447 bool "Freescale MXS-based"
448 select ARCH_REQUIRE_GPIOLIB
452 select GENERIC_CLOCKEVENTS
453 select HAVE_CLK_PREPARE
454 select MULTI_IRQ_HANDLER
459 Support for Freescale MXS-based family of processors
462 bool "Hilscher NetX based"
466 select GENERIC_CLOCKEVENTS
468 This enables support for systems based on the Hilscher NetX Soc
471 bool "Hynix HMS720x-based"
472 select ARCH_USES_GETTIMEOFFSET
476 This enables support for systems based on the Hynix HMS720x
481 select ARCH_SUPPORTS_MSI
483 select NEED_MACH_MEMORY_H
484 select NEED_RET_TO_USER
489 Support for Intel's IOP13XX (XScale) family of processors.
494 select ARCH_REQUIRE_GPIOLIB
496 select NEED_MACH_GPIO_H
497 select NEED_RET_TO_USER
501 Support for Intel's 80219 and IOP32X (XScale) family of
507 select ARCH_REQUIRE_GPIOLIB
509 select NEED_MACH_GPIO_H
510 select NEED_RET_TO_USER
514 Support for Intel's IOP33X (XScale) family of processors.
519 select ARCH_HAS_DMA_SET_COHERENT_MASK
520 select ARCH_REQUIRE_GPIOLIB
523 select DMABOUNCE if PCI
524 select GENERIC_CLOCKEVENTS
525 select MIGHT_HAVE_PCI
526 select NEED_MACH_IO_H
528 Support for Intel's IXP4XX (XScale) family of processors.
532 select ARCH_REQUIRE_GPIOLIB
534 select GENERIC_CLOCKEVENTS
535 select MIGHT_HAVE_PCI
536 select PLAT_ORION_LEGACY
537 select USB_ARCH_HAS_EHCI
539 Support for the Marvell Dove SoC 88AP510
542 bool "Marvell Kirkwood"
543 select ARCH_REQUIRE_GPIOLIB
545 select GENERIC_CLOCKEVENTS
547 select PLAT_ORION_LEGACY
549 Support for the following Marvell Kirkwood series SoCs:
550 88F6180, 88F6192 and 88F6281.
554 select ARCH_REQUIRE_GPIOLIB
559 select GENERIC_CLOCKEVENTS
562 select USB_ARCH_HAS_OHCI
565 Support for the NXP LPC32XX family of processors
568 bool "Marvell MV78xx0"
569 select ARCH_REQUIRE_GPIOLIB
571 select GENERIC_CLOCKEVENTS
573 select PLAT_ORION_LEGACY
575 Support for the following Marvell MV78xx0 series SoCs:
581 select ARCH_REQUIRE_GPIOLIB
583 select GENERIC_CLOCKEVENTS
585 select PLAT_ORION_LEGACY
587 Support for the following Marvell Orion 5x series SoCs:
588 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
589 Orion-2 (5281), Orion-1-90 (6183).
592 bool "Marvell PXA168/910/MMP2"
594 select ARCH_REQUIRE_GPIOLIB
596 select GENERIC_ALLOCATOR
597 select GENERIC_CLOCKEVENTS
600 select NEED_MACH_GPIO_H
604 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
607 bool "Micrel/Kendin KS8695"
608 select ARCH_REQUIRE_GPIOLIB
611 select GENERIC_CLOCKEVENTS
612 select NEED_MACH_MEMORY_H
614 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
615 System-on-Chip devices.
618 bool "Nuvoton W90X900 CPU"
619 select ARCH_REQUIRE_GPIOLIB
623 select GENERIC_CLOCKEVENTS
625 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
626 At present, the w90x900 has been renamed nuc900, regarding
627 the ARM series product line, you can login the following
628 link address to know more.
630 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
631 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
635 select ARCH_HAS_CPUFREQ
639 select GENERIC_CLOCKEVENTS
643 select MIGHT_HAVE_CACHE_L2X0
646 This enables support for NVIDIA Tegra based systems (Tegra APX,
647 Tegra 6xx and Tegra 2 series).
650 bool "PXA2xx/PXA3xx-based"
652 select ARCH_HAS_CPUFREQ
654 select ARCH_REQUIRE_GPIOLIB
655 select ARM_CPU_SUSPEND if PM
659 select GENERIC_CLOCKEVENTS
662 select MULTI_IRQ_HANDLER
663 select NEED_MACH_GPIO_H
667 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
671 select ARCH_REQUIRE_GPIOLIB
673 select GENERIC_CLOCKEVENTS
676 Support for Qualcomm MSM/QSD based systems. This runs on the
677 apps processor of the MSM/QSD and depends on a shared memory
678 interface to the modem processor which runs the baseband
679 stack and controls some vital subsystems
680 (clock and power control, etc).
683 bool "Renesas SH-Mobile / R-Mobile"
685 select GENERIC_CLOCKEVENTS
687 select HAVE_MACH_CLKDEV
689 select MIGHT_HAVE_CACHE_L2X0
690 select MULTI_IRQ_HANDLER
691 select NEED_MACH_MEMORY_H
693 select PM_GENERIC_DOMAINS if PM
696 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
701 select ARCH_MAY_HAVE_PC_FDC
702 select ARCH_SPARSEMEM_ENABLE
703 select ARCH_USES_GETTIMEOFFSET
706 select HAVE_PATA_PLATFORM
708 select NEED_MACH_IO_H
709 select NEED_MACH_MEMORY_H
712 On the Acorn Risc-PC, Linux can support the internal IDE disk and
713 CD-ROM interface, serial and parallel port, and the floppy drive.
717 select ARCH_HAS_CPUFREQ
719 select ARCH_REQUIRE_GPIOLIB
720 select ARCH_SPARSEMEM_ENABLE
725 select GENERIC_CLOCKEVENTS
728 select NEED_MACH_GPIO_H
729 select NEED_MACH_MEMORY_H
732 Support for StrongARM 11x0 based boards.
735 bool "Samsung S3C24XX SoCs"
736 select ARCH_HAS_CPUFREQ
737 select ARCH_USES_GETTIMEOFFSET
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
745 select NEED_MACH_IO_H
747 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
748 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
749 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
750 Samsung SMDK2410 development board (and derivatives).
753 bool "Samsung S3C64XX"
754 select ARCH_HAS_CPUFREQ
755 select ARCH_REQUIRE_GPIOLIB
756 select ARCH_USES_GETTIMEOFFSET
761 select HAVE_S3C2410_I2C if I2C
762 select HAVE_S3C2410_WATCHDOG if WATCHDOG
764 select NEED_MACH_GPIO_H
768 select S3C_GPIO_TRACK
769 select SAMSUNG_CLKSRC
770 select SAMSUNG_GPIOLIB_4BIT
771 select SAMSUNG_IRQ_VIC_TIMER
772 select USB_ARCH_HAS_OHCI
774 Samsung S3C64XX series based systems
777 bool "Samsung S5P6440 S5P6450"
781 select GENERIC_CLOCKEVENTS
784 select HAVE_S3C2410_I2C if I2C
785 select HAVE_S3C2410_WATCHDOG if WATCHDOG
786 select HAVE_S3C_RTC if RTC_CLASS
787 select NEED_MACH_GPIO_H
789 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
793 bool "Samsung S5PC100"
794 select ARCH_USES_GETTIMEOFFSET
799 select HAVE_S3C2410_I2C if I2C
800 select HAVE_S3C2410_WATCHDOG if WATCHDOG
801 select HAVE_S3C_RTC if RTC_CLASS
802 select NEED_MACH_GPIO_H
804 Samsung S5PC100 series based systems
807 bool "Samsung S5PV210/S5PC110"
808 select ARCH_HAS_CPUFREQ
809 select ARCH_HAS_HOLES_MEMORYMODEL
810 select ARCH_SPARSEMEM_ENABLE
814 select GENERIC_CLOCKEVENTS
817 select HAVE_S3C2410_I2C if I2C
818 select HAVE_S3C2410_WATCHDOG if WATCHDOG
819 select HAVE_S3C_RTC if RTC_CLASS
820 select NEED_MACH_GPIO_H
821 select NEED_MACH_MEMORY_H
823 Samsung S5PV210/S5PC110 series based systems
826 bool "SAMSUNG EXYNOS"
827 select ARCH_HAS_CPUFREQ
828 select ARCH_HAS_HOLES_MEMORYMODEL
829 select ARCH_SPARSEMEM_ENABLE
832 select GENERIC_CLOCKEVENTS
835 select HAVE_S3C2410_I2C if I2C
836 select HAVE_S3C2410_WATCHDOG if WATCHDOG
837 select HAVE_S3C_RTC if RTC_CLASS
838 select NEED_MACH_GPIO_H
839 select NEED_MACH_MEMORY_H
841 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
845 select ARCH_USES_GETTIMEOFFSET
849 select NEED_MACH_MEMORY_H
853 Support for the StrongARM based Digital DNARD machine, also known
854 as "Shark" (<http://www.shark-linux.de/shark.html>).
857 bool "ST-Ericsson U300 Series"
859 select ARCH_REQUIRE_GPIOLIB
861 select ARM_PATCH_PHYS_VIRT
867 select GENERIC_CLOCKEVENTS
872 Support for ST-Ericsson U300 series mobile platforms.
875 bool "ST-Ericsson U8500 Series"
877 select ARCH_HAS_CPUFREQ
878 select ARCH_REQUIRE_GPIOLIB
882 select GENERIC_CLOCKEVENTS
884 select MIGHT_HAVE_CACHE_L2X0
886 Support for ST-Ericsson's Ux500 architecture
889 bool "STMicroelectronics Nomadik"
890 select ARCH_REQUIRE_GPIOLIB
895 select GENERIC_CLOCKEVENTS
896 select MIGHT_HAVE_CACHE_L2X0
898 select PINCTRL_STN8815
900 Support for the Nomadik platform by ST-Ericsson
904 select ARCH_HAS_HOLES_MEMORYMODEL
905 select ARCH_REQUIRE_GPIOLIB
907 select GENERIC_ALLOCATOR
908 select GENERIC_CLOCKEVENTS
909 select GENERIC_IRQ_CHIP
911 select NEED_MACH_GPIO_H
914 Support for TI's DaVinci platform.
919 select ARCH_HAS_CPUFREQ
920 select ARCH_HAS_HOLES_MEMORYMODEL
921 select ARCH_REQUIRE_GPIOLIB
923 select GENERIC_CLOCKEVENTS
925 select NEED_MACH_GPIO_H
927 Support for TI's OMAP platform (OMAP1/2/3/4).
931 select ARCH_REQUIRE_GPIOLIB
936 select GENERIC_CLOCKEVENTS
939 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
942 bool "VIA/WonderMedia 85xx"
943 select ARCH_HAS_CPUFREQ
944 select ARCH_REQUIRE_GPIOLIB
948 select GENERIC_CLOCKEVENTS
953 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
956 bool "Xilinx Zynq ARM Cortex A9 Platform"
961 select GENERIC_CLOCKEVENTS
963 select MIGHT_HAVE_CACHE_L2X0
966 Support for Xilinx Zynq ARM Cortex A9 Platform
969 menu "Multiple platform selection"
970 depends on ARCH_MULTIPLATFORM
972 comment "CPU Core family selection"
975 bool "ARMv4 based platforms (FA526, StrongARM)"
976 depends on !ARCH_MULTI_V6_V7
977 select ARCH_MULTI_V4_V5
979 config ARCH_MULTI_V4T
980 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
981 depends on !ARCH_MULTI_V6_V7
982 select ARCH_MULTI_V4_V5
985 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
986 depends on !ARCH_MULTI_V6_V7
987 select ARCH_MULTI_V4_V5
989 config ARCH_MULTI_V4_V5
993 bool "ARMv6 based platforms (ARM11, Scorpion, ...)"
994 select ARCH_MULTI_V6_V7
998 bool "ARMv7 based platforms (Cortex-A, PJ4, Krait)"
1000 select ARCH_MULTI_V6_V7
1001 select ARCH_VEXPRESS
1004 config ARCH_MULTI_V6_V7
1007 config ARCH_MULTI_CPU_AUTO
1008 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
1009 select ARCH_MULTI_V5
1014 # This is sorted alphabetically by mach-* pathname. However, plat-*
1015 # Kconfigs may be included either alphabetically (according to the
1016 # plat- suffix) or along side the corresponding mach-* source.
1018 source "arch/arm/mach-mvebu/Kconfig"
1020 source "arch/arm/mach-at91/Kconfig"
1022 source "arch/arm/mach-clps711x/Kconfig"
1024 source "arch/arm/mach-cns3xxx/Kconfig"
1026 source "arch/arm/mach-davinci/Kconfig"
1028 source "arch/arm/mach-dove/Kconfig"
1030 source "arch/arm/mach-ep93xx/Kconfig"
1032 source "arch/arm/mach-footbridge/Kconfig"
1034 source "arch/arm/mach-gemini/Kconfig"
1036 source "arch/arm/mach-h720x/Kconfig"
1038 source "arch/arm/mach-highbank/Kconfig"
1040 source "arch/arm/mach-integrator/Kconfig"
1042 source "arch/arm/mach-iop32x/Kconfig"
1044 source "arch/arm/mach-iop33x/Kconfig"
1046 source "arch/arm/mach-iop13xx/Kconfig"
1048 source "arch/arm/mach-ixp4xx/Kconfig"
1050 source "arch/arm/mach-kirkwood/Kconfig"
1052 source "arch/arm/mach-ks8695/Kconfig"
1054 source "arch/arm/mach-msm/Kconfig"
1056 source "arch/arm/mach-mv78xx0/Kconfig"
1058 source "arch/arm/plat-mxc/Kconfig"
1060 source "arch/arm/mach-mxs/Kconfig"
1062 source "arch/arm/mach-netx/Kconfig"
1064 source "arch/arm/mach-nomadik/Kconfig"
1065 source "arch/arm/plat-nomadik/Kconfig"
1067 source "arch/arm/plat-omap/Kconfig"
1069 source "arch/arm/mach-omap1/Kconfig"
1071 source "arch/arm/mach-omap2/Kconfig"
1073 source "arch/arm/mach-orion5x/Kconfig"
1075 source "arch/arm/mach-picoxcell/Kconfig"
1077 source "arch/arm/mach-pxa/Kconfig"
1078 source "arch/arm/plat-pxa/Kconfig"
1080 source "arch/arm/mach-mmp/Kconfig"
1082 source "arch/arm/mach-realview/Kconfig"
1084 source "arch/arm/mach-sa1100/Kconfig"
1086 source "arch/arm/plat-samsung/Kconfig"
1087 source "arch/arm/plat-s3c24xx/Kconfig"
1089 source "arch/arm/mach-socfpga/Kconfig"
1091 source "arch/arm/plat-spear/Kconfig"
1093 source "arch/arm/mach-s3c24xx/Kconfig"
1095 source "arch/arm/mach-s3c2412/Kconfig"
1096 source "arch/arm/mach-s3c2440/Kconfig"
1100 source "arch/arm/mach-s3c64xx/Kconfig"
1103 source "arch/arm/mach-s5p64x0/Kconfig"
1105 source "arch/arm/mach-s5pc100/Kconfig"
1107 source "arch/arm/mach-s5pv210/Kconfig"
1109 source "arch/arm/mach-exynos/Kconfig"
1111 source "arch/arm/mach-shmobile/Kconfig"
1113 source "arch/arm/mach-prima2/Kconfig"
1115 source "arch/arm/mach-tegra/Kconfig"
1117 source "arch/arm/mach-u300/Kconfig"
1119 source "arch/arm/mach-ux500/Kconfig"
1121 source "arch/arm/mach-versatile/Kconfig"
1123 source "arch/arm/mach-vexpress/Kconfig"
1124 source "arch/arm/plat-versatile/Kconfig"
1126 source "arch/arm/mach-w90x900/Kconfig"
1128 # Definitions to make life easier
1134 select GENERIC_CLOCKEVENTS
1140 select GENERIC_IRQ_CHIP
1143 config PLAT_ORION_LEGACY
1150 config PLAT_VERSATILE
1153 config ARM_TIMER_SP804
1156 select HAVE_SCHED_CLOCK
1158 source arch/arm/mm/Kconfig
1162 default 16 if ARCH_EP93XX
1166 bool "Enable iWMMXt support"
1167 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1168 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1170 Enable support for iWMMXt context switching at run time if
1171 running on a CPU that supports it.
1175 depends on CPU_XSCALE
1178 config MULTI_IRQ_HANDLER
1181 Allow each machine to specify it's own IRQ handler at run time.
1184 source "arch/arm/Kconfig-nommu"
1187 config ARM_ERRATA_326103
1188 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
1191 Executing a SWP instruction to read-only memory does not set bit 11
1192 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
1193 treat the access as a read, preventing a COW from occurring and
1194 causing the faulting task to livelock.
1196 config ARM_ERRATA_411920
1197 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1198 depends on CPU_V6 || CPU_V6K
1200 Invalidation of the Instruction Cache operation can
1201 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1202 It does not affect the MPCore. This option enables the ARM Ltd.
1203 recommended workaround.
1205 config ARM_ERRATA_430973
1206 bool "ARM errata: Stale prediction on replaced interworking branch"
1209 This option enables the workaround for the 430973 Cortex-A8
1210 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1211 interworking branch is replaced with another code sequence at the
1212 same virtual address, whether due to self-modifying code or virtual
1213 to physical address re-mapping, Cortex-A8 does not recover from the
1214 stale interworking branch prediction. This results in Cortex-A8
1215 executing the new code sequence in the incorrect ARM or Thumb state.
1216 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1217 and also flushes the branch target cache at every context switch.
1218 Note that setting specific bits in the ACTLR register may not be
1219 available in non-secure mode.
1221 config ARM_ERRATA_458693
1222 bool "ARM errata: Processor deadlock when a false hazard is created"
1225 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1226 erratum. For very specific sequences of memory operations, it is
1227 possible for a hazard condition intended for a cache line to instead
1228 be incorrectly associated with a different cache line. This false
1229 hazard might then cause a processor deadlock. The workaround enables
1230 the L1 caching of the NEON accesses and disables the PLD instruction
1231 in the ACTLR register. Note that setting specific bits in the ACTLR
1232 register may not be available in non-secure mode.
1234 config ARM_ERRATA_460075
1235 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1238 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1239 erratum. Any asynchronous access to the L2 cache may encounter a
1240 situation in which recent store transactions to the L2 cache are lost
1241 and overwritten with stale memory contents from external memory. The
1242 workaround disables the write-allocate mode for the L2 cache via the
1243 ACTLR register. Note that setting specific bits in the ACTLR register
1244 may not be available in non-secure mode.
1246 config ARM_ERRATA_742230
1247 bool "ARM errata: DMB operation may be faulty"
1248 depends on CPU_V7 && SMP
1250 This option enables the workaround for the 742230 Cortex-A9
1251 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1252 between two write operations may not ensure the correct visibility
1253 ordering of the two writes. This workaround sets a specific bit in
1254 the diagnostic register of the Cortex-A9 which causes the DMB
1255 instruction to behave as a DSB, ensuring the correct behaviour of
1258 config ARM_ERRATA_742231
1259 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1260 depends on CPU_V7 && SMP
1262 This option enables the workaround for the 742231 Cortex-A9
1263 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1264 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1265 accessing some data located in the same cache line, may get corrupted
1266 data due to bad handling of the address hazard when the line gets
1267 replaced from one of the CPUs at the same time as another CPU is
1268 accessing it. This workaround sets specific bits in the diagnostic
1269 register of the Cortex-A9 which reduces the linefill issuing
1270 capabilities of the processor.
1272 config PL310_ERRATA_588369
1273 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
1274 depends on CACHE_L2X0
1276 The PL310 L2 cache controller implements three types of Clean &
1277 Invalidate maintenance operations: by Physical Address
1278 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1279 They are architecturally defined to behave as the execution of a
1280 clean operation followed immediately by an invalidate operation,
1281 both performing to the same memory location. This functionality
1282 is not correctly implemented in PL310 as clean lines are not
1283 invalidated as a result of these operations.
1285 config ARM_ERRATA_720789
1286 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1289 This option enables the workaround for the 720789 Cortex-A9 (prior to
1290 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1291 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1292 As a consequence of this erratum, some TLB entries which should be
1293 invalidated are not, resulting in an incoherency in the system page
1294 tables. The workaround changes the TLB flushing routines to invalidate
1295 entries regardless of the ASID.
1297 config PL310_ERRATA_727915
1298 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
1299 depends on CACHE_L2X0
1301 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1302 operation (offset 0x7FC). This operation runs in background so that
1303 PL310 can handle normal accesses while it is in progress. Under very
1304 rare circumstances, due to this erratum, write data can be lost when
1305 PL310 treats a cacheable write transaction during a Clean &
1306 Invalidate by Way operation.
1308 config ARM_ERRATA_743622
1309 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1312 This option enables the workaround for the 743622 Cortex-A9
1313 (r2p*) erratum. Under very rare conditions, a faulty
1314 optimisation in the Cortex-A9 Store Buffer may lead to data
1315 corruption. This workaround sets a specific bit in the diagnostic
1316 register of the Cortex-A9 which disables the Store Buffer
1317 optimisation, preventing the defect from occurring. This has no
1318 visible impact on the overall performance or power consumption of the
1321 config ARM_ERRATA_751472
1322 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1325 This option enables the workaround for the 751472 Cortex-A9 (prior
1326 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1327 completion of a following broadcasted operation if the second
1328 operation is received by a CPU before the ICIALLUIS has completed,
1329 potentially leading to corrupted entries in the cache or TLB.
1331 config PL310_ERRATA_753970
1332 bool "PL310 errata: cache sync operation may be faulty"
1333 depends on CACHE_PL310
1335 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1337 Under some condition the effect of cache sync operation on
1338 the store buffer still remains when the operation completes.
1339 This means that the store buffer is always asked to drain and
1340 this prevents it from merging any further writes. The workaround
1341 is to replace the normal offset of cache sync operation (0x730)
1342 by another offset targeting an unmapped PL310 register 0x740.
1343 This has the same effect as the cache sync operation: store buffer
1344 drain and waiting for all buffers empty.
1346 config ARM_ERRATA_754322
1347 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1350 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1351 r3p*) erratum. A speculative memory access may cause a page table walk
1352 which starts prior to an ASID switch but completes afterwards. This
1353 can populate the micro-TLB with a stale entry which may be hit with
1354 the new ASID. This workaround places two dsb instructions in the mm
1355 switching code so that no page table walks can cross the ASID switch.
1357 config ARM_ERRATA_754327
1358 bool "ARM errata: no automatic Store Buffer drain"
1359 depends on CPU_V7 && SMP
1361 This option enables the workaround for the 754327 Cortex-A9 (prior to
1362 r2p0) erratum. The Store Buffer does not have any automatic draining
1363 mechanism and therefore a livelock may occur if an external agent
1364 continuously polls a memory location waiting to observe an update.
1365 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1366 written polling loops from denying visibility of updates to memory.
1368 config ARM_ERRATA_364296
1369 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1370 depends on CPU_V6 && !SMP
1372 This options enables the workaround for the 364296 ARM1136
1373 r0p2 erratum (possible cache data corruption with
1374 hit-under-miss enabled). It sets the undocumented bit 31 in
1375 the auxiliary control register and the FI bit in the control
1376 register, thus disabling hit-under-miss without putting the
1377 processor into full low interrupt latency mode. ARM11MPCore
1380 config ARM_ERRATA_764369
1381 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1382 depends on CPU_V7 && SMP
1384 This option enables the workaround for erratum 764369
1385 affecting Cortex-A9 MPCore with two or more processors (all
1386 current revisions). Under certain timing circumstances, a data
1387 cache line maintenance operation by MVA targeting an Inner
1388 Shareable memory region may fail to proceed up to either the
1389 Point of Coherency or to the Point of Unification of the
1390 system. This workaround adds a DSB instruction before the
1391 relevant cache maintenance functions and sets a specific bit
1392 in the diagnostic control register of the SCU.
1394 config PL310_ERRATA_769419
1395 bool "PL310 errata: no automatic Store Buffer drain"
1396 depends on CACHE_L2X0
1398 On revisions of the PL310 prior to r3p2, the Store Buffer does
1399 not automatically drain. This can cause normal, non-cacheable
1400 writes to be retained when the memory system is idle, leading
1401 to suboptimal I/O performance for drivers using coherent DMA.
1402 This option adds a write barrier to the cpu_idle loop so that,
1403 on systems with an outer cache, the store buffer is drained
1406 config ARM_ERRATA_775420
1407 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1410 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1411 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1412 operation aborts with MMU exception, it might cause the processor
1413 to deadlock. This workaround puts DSB before executing ISB if
1414 an abort may occur on cache maintenance.
1418 source "arch/arm/common/Kconfig"
1428 Find out whether you have ISA slots on your motherboard. ISA is the
1429 name of a bus system, i.e. the way the CPU talks to the other stuff
1430 inside your box. Other bus systems are PCI, EISA, MicroChannel
1431 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1432 newer boards don't support it. If you have ISA, say Y, otherwise N.
1434 # Select ISA DMA controller support
1439 # Select ISA DMA interface
1444 bool "PCI support" if MIGHT_HAVE_PCI
1446 Find out whether you have a PCI motherboard. PCI is the name of a
1447 bus system, i.e. the way the CPU talks to the other stuff inside
1448 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1449 VESA. If you have PCI, say Y, otherwise N.
1455 config PCI_NANOENGINE
1456 bool "BSE nanoEngine PCI support"
1457 depends on SA1100_NANOENGINE
1459 Enable PCI on the BSE nanoEngine board.
1464 # Select the host bridge type
1465 config PCI_HOST_VIA82C505
1467 depends on PCI && ARCH_SHARK
1470 config PCI_HOST_ITE8152
1472 depends on PCI && MACH_ARMCORE
1476 source "drivers/pci/Kconfig"
1478 source "drivers/pcmcia/Kconfig"
1482 menu "Kernel Features"
1487 This option should be selected by machines which have an SMP-
1490 The only effect of this option is to make the SMP-related
1491 options available to the user for configuration.
1494 bool "Symmetric Multi-Processing"
1495 depends on CPU_V6K || CPU_V7
1496 depends on GENERIC_CLOCKEVENTS
1499 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1500 select USE_GENERIC_SMP_HELPERS
1502 This enables support for systems with more than one CPU. If you have
1503 a system with only one CPU, like most personal computers, say N. If
1504 you have a system with more than one CPU, say Y.
1506 If you say N here, the kernel will run on single and multiprocessor
1507 machines, but will use only one CPU of a multiprocessor machine. If
1508 you say Y here, the kernel will run on many, but not all, single
1509 processor machines. On a single processor machine, the kernel will
1510 run faster if you say N here.
1512 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1513 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1514 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1516 If you don't know what to do here, say N.
1519 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1520 depends on EXPERIMENTAL
1521 depends on SMP && !XIP_KERNEL
1524 SMP kernels contain instructions which fail on non-SMP processors.
1525 Enabling this option allows the kernel to modify itself to make
1526 these instructions safe. Disabling it allows about 1K of space
1529 If you don't know what to do here, say Y.
1531 config ARM_CPU_TOPOLOGY
1532 bool "Support cpu topology definition"
1533 depends on SMP && CPU_V7
1536 Support ARM cpu topology definition. The MPIDR register defines
1537 affinity between processors which is then used to describe the cpu
1538 topology of an ARM System.
1541 bool "Multi-core scheduler support"
1542 depends on ARM_CPU_TOPOLOGY
1544 Multi-core scheduler support improves the CPU scheduler's decision
1545 making when dealing with multi-core CPU chips at a cost of slightly
1546 increased overhead in some places. If unsure say N here.
1549 bool "SMT scheduler support"
1550 depends on ARM_CPU_TOPOLOGY
1552 Improves the CPU scheduler's decision making when dealing with
1553 MultiThreading at a cost of slightly increased overhead in some
1554 places. If unsure say N here.
1559 This option enables support for the ARM system coherency unit
1561 config ARM_ARCH_TIMER
1562 bool "Architected timer support"
1565 This option enables support for the ARM architected timer
1571 This options enables support for the ARM timer and watchdog unit
1574 prompt "Memory split"
1577 Select the desired split between kernel and user memory.
1579 If you are not absolutely sure what you are doing, leave this
1583 bool "3G/1G user/kernel split"
1585 bool "2G/2G user/kernel split"
1587 bool "1G/3G user/kernel split"
1592 default 0x40000000 if VMSPLIT_1G
1593 default 0x80000000 if VMSPLIT_2G
1597 int "Maximum number of CPUs (2-32)"
1603 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1604 depends on SMP && HOTPLUG && EXPERIMENTAL
1606 Say Y here to experiment with turning CPUs off and on. CPUs
1607 can be controlled through /sys/devices/system/cpu.
1610 bool "Use local timer interrupts"
1613 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1615 Enable support for local timers on SMP platforms, rather then the
1616 legacy IPI broadcast method. Local timers allows the system
1617 accounting to be spread across the timer interval, preventing a
1618 "thundering herd" at every timer tick.
1622 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
1623 default 355 if ARCH_U8500
1624 default 264 if MACH_H4700
1625 default 512 if SOC_OMAP5
1626 default 288 if ARCH_VT8500
1629 Maximum number of GPIOs in the system.
1631 If unsure, leave the default value.
1633 source kernel/Kconfig.preempt
1637 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
1638 ARCH_S5PV210 || ARCH_EXYNOS4
1639 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1640 default AT91_TIMER_HZ if ARCH_AT91
1641 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1644 config THUMB2_KERNEL
1645 bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
1646 depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
1648 select ARM_ASM_UNIFIED
1651 By enabling this option, the kernel will be compiled in
1652 Thumb-2 mode. A compiler/assembler that understand the unified
1653 ARM-Thumb syntax is needed.
1657 config THUMB2_AVOID_R_ARM_THM_JUMP11
1658 bool "Work around buggy Thumb-2 short branch relocations in gas"
1659 depends on THUMB2_KERNEL && MODULES
1662 Various binutils versions can resolve Thumb-2 branches to
1663 locally-defined, preemptible global symbols as short-range "b.n"
1664 branch instructions.
1666 This is a problem, because there's no guarantee the final
1667 destination of the symbol, or any candidate locations for a
1668 trampoline, are within range of the branch. For this reason, the
1669 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1670 relocation in modules at all, and it makes little sense to add
1673 The symptom is that the kernel fails with an "unsupported
1674 relocation" error when loading some modules.
1676 Until fixed tools are available, passing
1677 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1678 code which hits this problem, at the cost of a bit of extra runtime
1679 stack usage in some cases.
1681 The problem is described in more detail at:
1682 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1684 Only Thumb-2 kernels are affected.
1686 Unless you are sure your tools don't have this problem, say Y.
1688 config ARM_ASM_UNIFIED
1692 bool "Use the ARM EABI to compile the kernel"
1694 This option allows for the kernel to be compiled using the latest
1695 ARM ABI (aka EABI). This is only useful if you are using a user
1696 space environment that is also compiled with EABI.
1698 Since there are major incompatibilities between the legacy ABI and
1699 EABI, especially with regard to structure member alignment, this
1700 option also changes the kernel syscall calling convention to
1701 disambiguate both ABIs and allow for backward compatibility support
1702 (selected with CONFIG_OABI_COMPAT).
1704 To use this you need GCC version 4.0.0 or later.
1707 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1708 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1711 This option preserves the old syscall interface along with the
1712 new (ARM EABI) one. It also provides a compatibility layer to
1713 intercept syscalls that have structure arguments which layout
1714 in memory differs between the legacy ABI and the new ARM EABI
1715 (only for non "thumb" binaries). This option adds a tiny
1716 overhead to all syscalls and produces a slightly larger kernel.
1717 If you know you'll be using only pure EABI user space then you
1718 can say N here. If this option is not selected and you attempt
1719 to execute a legacy ABI binary then the result will be
1720 UNPREDICTABLE (in fact it can be predicted that it won't work
1721 at all). If in doubt say Y.
1723 config ARCH_HAS_HOLES_MEMORYMODEL
1726 config ARCH_SPARSEMEM_ENABLE
1729 config ARCH_SPARSEMEM_DEFAULT
1730 def_bool ARCH_SPARSEMEM_ENABLE
1732 config ARCH_SELECT_MEMORY_MODEL
1733 def_bool ARCH_SPARSEMEM_ENABLE
1735 config HAVE_ARCH_PFN_VALID
1736 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1739 bool "High Memory Support"
1742 The address space of ARM processors is only 4 Gigabytes large
1743 and it has to accommodate user address space, kernel address
1744 space as well as some memory mapped IO. That means that, if you
1745 have a large amount of physical memory and/or IO, not all of the
1746 memory can be "permanently mapped" by the kernel. The physical
1747 memory that is not permanently mapped is called "high memory".
1749 Depending on the selected kernel/user memory split, minimum
1750 vmalloc space and actual amount of RAM, you may not need this
1751 option which should result in a slightly faster kernel.
1756 bool "Allocate 2nd-level pagetables from highmem"
1759 config HW_PERF_EVENTS
1760 bool "Enable hardware performance counter support for perf events"
1761 depends on PERF_EVENTS
1764 Enable hardware performance counter support for perf events. If
1765 disabled, perf events will use software events only.
1769 config FORCE_MAX_ZONEORDER
1770 int "Maximum zone order" if ARCH_SHMOBILE
1771 range 11 64 if ARCH_SHMOBILE
1772 default "12" if SOC_AM33XX
1773 default "9" if SA1111
1776 The kernel memory allocator divides physically contiguous memory
1777 blocks into "zones", where each zone is a power of two number of
1778 pages. This option selects the largest power of two that the kernel
1779 keeps in the memory allocator. If you need to allocate very large
1780 blocks of physically contiguous memory, then you may need to
1781 increase this value.
1783 This config option is actually maximum order plus one. For example,
1784 a value of 11 means that the largest free memory block is 2^10 pages.
1786 config ALIGNMENT_TRAP
1788 depends on CPU_CP15_MMU
1789 default y if !ARCH_EBSA110
1790 select HAVE_PROC_CPU if PROC_FS
1792 ARM processors cannot fetch/store information which is not
1793 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1794 address divisible by 4. On 32-bit ARM processors, these non-aligned
1795 fetch/store instructions will be emulated in software if you say
1796 here, which has a severe performance impact. This is necessary for
1797 correct operation of some network protocols. With an IP-only
1798 configuration it is safe to say N, otherwise say Y.
1800 config UACCESS_WITH_MEMCPY
1801 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1803 default y if CPU_FEROCEON
1805 Implement faster copy_to_user and clear_user methods for CPU
1806 cores where a 8-word STM instruction give significantly higher
1807 memory write throughput than a sequence of individual 32bit stores.
1809 A possible side effect is a slight increase in scheduling latency
1810 between threads sharing the same address space if they invoke
1811 such copy operations with large buffers.
1813 However, if the CPU data cache is using a write-allocate mode,
1814 this option is unlikely to provide any performance gain.
1818 prompt "Enable seccomp to safely compute untrusted bytecode"
1820 This kernel feature is useful for number crunching applications
1821 that may need to compute untrusted bytecode during their
1822 execution. By using pipes or other transports made available to
1823 the process as file descriptors supporting the read/write
1824 syscalls, it's possible to isolate those applications in
1825 their own address space using seccomp. Once seccomp is
1826 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1827 and the task is only allowed to execute a few safe syscalls
1828 defined by each seccomp mode.
1830 config CC_STACKPROTECTOR
1831 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1832 depends on EXPERIMENTAL
1834 This option turns on the -fstack-protector GCC feature. This
1835 feature puts, at the beginning of functions, a canary value on
1836 the stack just before the return address, and validates
1837 the value just before actually returning. Stack based buffer
1838 overflows (that need to overwrite this return address) now also
1839 overwrite the canary, which gets detected and the attack is then
1840 neutralized via a kernel panic.
1841 This feature requires gcc version 4.2 or above.
1848 bool "Xen guest support on ARM (EXPERIMENTAL)"
1849 depends on EXPERIMENTAL && ARM && OF
1851 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1858 bool "Flattened Device Tree support"
1861 select OF_EARLY_FLATTREE
1863 Include support for flattened device tree machine descriptions.
1866 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1869 This is the traditional way of passing data to the kernel at boot
1870 time. If you are solely relying on the flattened device tree (or
1871 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1872 to remove ATAGS support from your kernel binary. If unsure,
1875 config DEPRECATED_PARAM_STRUCT
1876 bool "Provide old way to pass kernel parameters"
1879 This was deprecated in 2001 and announced to live on for 5 years.
1880 Some old boot loaders still use this way.
1882 # Compressed boot loader in ROM. Yes, we really want to ask about
1883 # TEXT and BSS so we preserve their values in the config files.
1884 config ZBOOT_ROM_TEXT
1885 hex "Compressed ROM boot loader base address"
1888 The physical address at which the ROM-able zImage is to be
1889 placed in the target. Platforms which normally make use of
1890 ROM-able zImage formats normally set this to a suitable
1891 value in their defconfig file.
1893 If ZBOOT_ROM is not enabled, this has no effect.
1895 config ZBOOT_ROM_BSS
1896 hex "Compressed ROM boot loader BSS address"
1899 The base address of an area of read/write memory in the target
1900 for the ROM-able zImage which must be available while the
1901 decompressor is running. It must be large enough to hold the
1902 entire decompressed kernel plus an additional 128 KiB.
1903 Platforms which normally make use of ROM-able zImage formats
1904 normally set this to a suitable value in their defconfig file.
1906 If ZBOOT_ROM is not enabled, this has no effect.
1909 bool "Compressed boot loader in ROM/flash"
1910 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1912 Say Y here if you intend to execute your compressed kernel image
1913 (zImage) directly from ROM or flash. If unsure, say N.
1916 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1917 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1918 default ZBOOT_ROM_NONE
1920 Include experimental SD/MMC loading code in the ROM-able zImage.
1921 With this enabled it is possible to write the ROM-able zImage
1922 kernel image to an MMC or SD card and boot the kernel straight
1923 from the reset vector. At reset the processor Mask ROM will load
1924 the first part of the ROM-able zImage which in turn loads the
1925 rest the kernel image to RAM.
1927 config ZBOOT_ROM_NONE
1928 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1930 Do not load image from SD or MMC
1932 config ZBOOT_ROM_MMCIF
1933 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1935 Load image from MMCIF hardware block.
1937 config ZBOOT_ROM_SH_MOBILE_SDHI
1938 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1940 Load image from SDHI hardware block
1944 config ARM_APPENDED_DTB
1945 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1946 depends on OF && !ZBOOT_ROM && EXPERIMENTAL
1948 With this option, the boot code will look for a device tree binary
1949 (DTB) appended to zImage
1950 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1952 This is meant as a backward compatibility convenience for those
1953 systems with a bootloader that can't be upgraded to accommodate
1954 the documented boot protocol using a device tree.
1956 Beware that there is very little in terms of protection against
1957 this option being confused by leftover garbage in memory that might
1958 look like a DTB header after a reboot if no actual DTB is appended
1959 to zImage. Do not leave this option active in a production kernel
1960 if you don't intend to always append a DTB. Proper passing of the
1961 location into r2 of a bootloader provided DTB is always preferable
1964 config ARM_ATAG_DTB_COMPAT
1965 bool "Supplement the appended DTB with traditional ATAG information"
1966 depends on ARM_APPENDED_DTB
1968 Some old bootloaders can't be updated to a DTB capable one, yet
1969 they provide ATAGs with memory configuration, the ramdisk address,
1970 the kernel cmdline string, etc. Such information is dynamically
1971 provided by the bootloader and can't always be stored in a static
1972 DTB. To allow a device tree enabled kernel to be used with such
1973 bootloaders, this option allows zImage to extract the information
1974 from the ATAG list and store it at run time into the appended DTB.
1977 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1978 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1980 config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1981 bool "Use bootloader kernel arguments if available"
1983 Uses the command-line options passed by the boot loader instead of
1984 the device tree bootargs property. If the boot loader doesn't provide
1985 any, the device tree bootargs property will be used.
1987 config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1988 bool "Extend with bootloader kernel arguments"
1990 The command-line arguments provided by the boot loader will be
1991 appended to the the device tree bootargs property.
1996 string "Default kernel command string"
1999 On some architectures (EBSA110 and CATS), there is currently no way
2000 for the boot loader to pass arguments to the kernel. For these
2001 architectures, you should supply some command-line options at build
2002 time by entering them here. As a minimum, you should specify the
2003 memory size and the root device (e.g., mem=64M root=/dev/nfs).
2006 prompt "Kernel command line type" if CMDLINE != ""
2007 default CMDLINE_FROM_BOOTLOADER
2010 config CMDLINE_FROM_BOOTLOADER
2011 bool "Use bootloader kernel arguments if available"
2013 Uses the command-line options passed by the boot loader. If
2014 the boot loader doesn't provide any, the default kernel command
2015 string provided in CMDLINE will be used.
2017 config CMDLINE_EXTEND
2018 bool "Extend bootloader kernel arguments"
2020 The command-line arguments provided by the boot loader will be
2021 appended to the default kernel command string.
2023 config CMDLINE_FORCE
2024 bool "Always use the default kernel command string"
2026 Always use the default kernel command string, even if the boot
2027 loader passes other arguments to the kernel.
2028 This is useful if you cannot or don't want to change the
2029 command-line options your boot loader passes to the kernel.
2033 bool "Kernel Execute-In-Place from ROM"
2034 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
2036 Execute-In-Place allows the kernel to run from non-volatile storage
2037 directly addressable by the CPU, such as NOR flash. This saves RAM
2038 space since the text section of the kernel is not loaded from flash
2039 to RAM. Read-write sections, such as the data section and stack,
2040 are still copied to RAM. The XIP kernel is not compressed since
2041 it has to run directly from flash, so it will take more space to
2042 store it. The flash address used to link the kernel object files,
2043 and for storing it, is configuration dependent. Therefore, if you
2044 say Y here, you must know the proper physical address where to
2045 store the kernel image depending on your own flash memory usage.
2047 Also note that the make target becomes "make xipImage" rather than
2048 "make zImage" or "make Image". The final kernel binary to put in
2049 ROM memory will be arch/arm/boot/xipImage.
2053 config XIP_PHYS_ADDR
2054 hex "XIP Kernel Physical Location"
2055 depends on XIP_KERNEL
2056 default "0x00080000"
2058 This is the physical address in your flash memory the kernel will
2059 be linked for and stored to. This address is dependent on your
2063 bool "Kexec system call (EXPERIMENTAL)"
2064 depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
2066 kexec is a system call that implements the ability to shutdown your
2067 current kernel, and to start another kernel. It is like a reboot
2068 but it is independent of the system firmware. And like a reboot
2069 you can start any kernel with it, not just Linux.
2071 It is an ongoing process to be certain the hardware in a machine
2072 is properly shutdown, so do not be surprised if this code does not
2073 initially work for you. It may help to enable device hotplugging
2077 bool "Export atags in procfs"
2078 depends on ATAGS && KEXEC
2081 Should the atags used to boot the kernel be exported in an "atags"
2082 file in procfs. Useful with kexec.
2085 bool "Build kdump crash kernel (EXPERIMENTAL)"
2086 depends on EXPERIMENTAL
2088 Generate crash dump after being started by kexec. This should
2089 be normally only set in special crash dump kernels which are
2090 loaded in the main kernel with kexec-tools into a specially
2091 reserved region and then later executed after a crash by
2092 kdump/kexec. The crash dump kernel must be compiled to a
2093 memory address not used by the main kernel
2095 For more details see Documentation/kdump/kdump.txt
2097 config AUTO_ZRELADDR
2098 bool "Auto calculation of the decompressed kernel image address"
2099 depends on !ZBOOT_ROM && !ARCH_U300
2101 ZRELADDR is the physical address where the decompressed kernel
2102 image will be placed. If AUTO_ZRELADDR is selected, the address
2103 will be determined at run-time by masking the current IP with
2104 0xf8000000. This assumes the zImage being placed in the first 128MB
2105 from start of memory.
2109 menu "CPU Power Management"
2113 source "drivers/cpufreq/Kconfig"
2116 tristate "CPUfreq driver for i.MX CPUs"
2117 depends on ARCH_MXC && CPU_FREQ
2118 select CPU_FREQ_TABLE
2120 This enables the CPUfreq driver for i.MX CPUs.
2122 config CPU_FREQ_SA1100
2125 config CPU_FREQ_SA1110
2128 config CPU_FREQ_INTEGRATOR
2129 tristate "CPUfreq driver for ARM Integrator CPUs"
2130 depends on ARCH_INTEGRATOR && CPU_FREQ
2133 This enables the CPUfreq driver for ARM Integrator CPUs.
2135 For details, take a look at <file:Documentation/cpu-freq>.
2141 depends on CPU_FREQ && ARCH_PXA && PXA25x
2143 select CPU_FREQ_DEFAULT_GOV_USERSPACE
2144 select CPU_FREQ_TABLE
2149 Internal configuration node for common cpufreq on Samsung SoC
2151 config CPU_FREQ_S3C24XX
2152 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
2153 depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
2156 This enables the CPUfreq driver for the Samsung S3C24XX family
2159 For details, take a look at <file:Documentation/cpu-freq>.
2163 config CPU_FREQ_S3C24XX_PLL
2164 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2165 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2167 Compile in support for changing the PLL frequency from the
2168 S3C24XX series CPUfreq driver. The PLL takes time to settle
2169 after a frequency change, so by default it is not enabled.
2171 This also means that the PLL tables for the selected CPU(s) will
2172 be built which may increase the size of the kernel image.
2174 config CPU_FREQ_S3C24XX_DEBUG
2175 bool "Debug CPUfreq Samsung driver core"
2176 depends on CPU_FREQ_S3C24XX
2178 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2180 config CPU_FREQ_S3C24XX_IODEBUG
2181 bool "Debug CPUfreq Samsung driver IO timing"
2182 depends on CPU_FREQ_S3C24XX
2184 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2186 config CPU_FREQ_S3C24XX_DEBUGFS
2187 bool "Export debugfs for CPUFreq"
2188 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2190 Export status information via debugfs.
2194 source "drivers/cpuidle/Kconfig"
2198 menu "Floating point emulation"
2200 comment "At least one emulation must be selected"
2203 bool "NWFPE math emulation"
2204 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2206 Say Y to include the NWFPE floating point emulator in the kernel.
2207 This is necessary to run most binaries. Linux does not currently
2208 support floating point hardware so you need to say Y here even if
2209 your machine has an FPA or floating point co-processor podule.
2211 You may say N here if you are going to load the Acorn FPEmulator
2212 early in the bootup.
2215 bool "Support extended precision"
2216 depends on FPE_NWFPE
2218 Say Y to include 80-bit support in the kernel floating-point
2219 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2220 Note that gcc does not generate 80-bit operations by default,
2221 so in most cases this option only enlarges the size of the
2222 floating point emulator without any good reason.
2224 You almost surely want to say N here.
2227 bool "FastFPE math emulation (EXPERIMENTAL)"
2228 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2230 Say Y here to include the FAST floating point emulator in the kernel.
2231 This is an experimental much faster emulator which now also has full
2232 precision for the mantissa. It does not support any exceptions.
2233 It is very simple, and approximately 3-6 times faster than NWFPE.
2235 It should be sufficient for most programs. It may be not suitable
2236 for scientific calculations, but you have to check this for yourself.
2237 If you do not feel you need a faster FP emulation you should better
2241 bool "VFP-format floating point maths"
2242 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2244 Say Y to include VFP support code in the kernel. This is needed
2245 if your hardware includes a VFP unit.
2247 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2248 release notes and additional status information.
2250 Say N if your target does not have VFP hardware.
2258 bool "Advanced SIMD (NEON) Extension support"
2259 depends on VFPv3 && CPU_V7
2261 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2266 menu "Userspace binary formats"
2268 source "fs/Kconfig.binfmt"
2271 tristate "RISC OS personality"
2274 Say Y here to include the kernel code necessary if you want to run
2275 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2276 experimental; if this sounds frightening, say N and sleep in peace.
2277 You can also say M here to compile this support as a module (which
2278 will be called arthur).
2282 menu "Power management options"
2284 source "kernel/power/Kconfig"
2286 config ARCH_SUSPEND_POSSIBLE
2287 depends on !ARCH_S5PC100
2288 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2289 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
2292 config ARM_CPU_SUSPEND
2297 source "net/Kconfig"
2299 source "drivers/Kconfig"
2303 source "arch/arm/Kconfig.debug"
2305 source "security/Kconfig"
2307 source "crypto/Kconfig"
2309 source "lib/Kconfig"