5 select HAVE_DMA_API_DEBUG
6 select HAVE_IDE if PCI || ISA || PCMCIA
9 select SYS_SUPPORTS_APM_EMULATION
10 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
11 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
13 select HAVE_KPROBES if !XIP_KERNEL
14 select HAVE_KRETPROBES if (HAVE_KPROBES)
15 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
16 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
17 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
18 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
19 select HAVE_GENERIC_DMA_COHERENT
20 select HAVE_KERNEL_GZIP
21 select HAVE_KERNEL_LZO
22 select HAVE_KERNEL_LZMA
24 select HAVE_PERF_EVENTS
25 select PERF_USE_VMALLOC
26 select HAVE_REGS_AND_STACK_ACCESS_API
27 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
28 select HAVE_C_RECORDMCOUNT
29 select HAVE_GENERIC_HARDIRQS
30 select HAVE_SPARSE_IRQ
31 select GENERIC_IRQ_SHOW
33 The ARM series is a line of low-power-consumption RISC chip designs
34 licensed by ARM Ltd and targeted at embedded applications and
35 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
36 manufactured, but legacy ARM-based PC hardware remains popular in
37 Europe. There is an ARM Linux project with a web page at
38 <http://www.arm.linux.org.uk/>.
40 config ARM_HAS_SG_CHAIN
49 config SYS_SUPPORTS_APM_EMULATION
52 config HAVE_SCHED_CLOCK
58 config ARCH_USES_GETTIMEOFFSET
62 config GENERIC_CLOCKEVENTS
65 config GENERIC_CLOCKEVENTS_BROADCAST
67 depends on GENERIC_CLOCKEVENTS
76 select GENERIC_ALLOCATOR
87 The Extended Industry Standard Architecture (EISA) bus was
88 developed as an open alternative to the IBM MicroChannel bus.
90 The EISA bus provided some of the features of the IBM MicroChannel
91 bus while maintaining backward compatibility with cards made for
92 the older ISA bus. The EISA bus saw limited use between 1988 and
93 1995 when it was made obsolete by the PCI bus.
95 Say Y here if you are building a kernel for an EISA-based machine.
105 MicroChannel Architecture is found in some IBM PS/2 machines and
106 laptops. It is a bus system similar to PCI or ISA. See
107 <file:Documentation/mca.txt> (and especially the web page given
108 there) before attempting to build an MCA bus kernel.
110 config STACKTRACE_SUPPORT
114 config HAVE_LATENCYTOP_SUPPORT
119 config LOCKDEP_SUPPORT
123 config TRACE_IRQFLAGS_SUPPORT
127 config HARDIRQS_SW_RESEND
131 config GENERIC_IRQ_PROBE
135 config GENERIC_LOCKBREAK
138 depends on SMP && PREEMPT
140 config RWSEM_GENERIC_SPINLOCK
144 config RWSEM_XCHGADD_ALGORITHM
147 config ARCH_HAS_ILOG2_U32
150 config ARCH_HAS_ILOG2_U64
153 config ARCH_HAS_CPUFREQ
156 Internal node to signify that the ARCH has CPUFREQ support
157 and that the relevant menu configurations are displayed for
160 config ARCH_HAS_CPU_IDLE_WAIT
163 config GENERIC_HWEIGHT
167 config GENERIC_CALIBRATE_DELAY
171 config ARCH_MAY_HAVE_PC_FDC
177 config NEED_DMA_MAP_STATE
180 config GENERIC_ISA_DMA
191 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
192 default DRAM_BASE if REMAP_VECTORS_TO_RAM
195 The base address of exception vectors.
197 config ARM_PATCH_PHYS_VIRT
198 bool "Patch physical to virtual translations at runtime" if EMBEDDED
200 depends on !XIP_KERNEL && MMU
201 depends on !ARCH_REALVIEW || !SPARSEMEM
203 Patch phys-to-virt and virt-to-phys translation functions at
204 boot and module load time according to the position of the
205 kernel in system memory.
207 This can only be used with non-XIP MMU kernels where the base
208 of physical memory is at a 16MB boundary.
210 Only disable this option if you know that you do not require
211 this feature (eg, building a kernel for a single machine) and
212 you need to shrink the kernel to the minimal size.
219 source "init/Kconfig"
221 source "kernel/Kconfig.freezer"
226 bool "MMU-based Paged Memory Management Support"
229 Select if you want MMU-based virtualised addressing space
230 support by paged memory management. If unsure, say 'Y'.
233 # The "ARM system type" choice list is ordered alphabetically by option
234 # text. Please add new entries in the option alphabetic order.
237 prompt "ARM system type"
238 default ARCH_VERSATILE
240 config ARCH_INTEGRATOR
241 bool "ARM Ltd. Integrator family"
243 select ARCH_HAS_CPUFREQ
245 select HAVE_MACH_CLKDEV
247 select GENERIC_CLOCKEVENTS
248 select PLAT_VERSATILE
249 select PLAT_VERSATILE_FPGA_IRQ
251 Support for ARM's Integrator platform.
254 bool "ARM Ltd. RealView family"
257 select HAVE_MACH_CLKDEV
259 select GENERIC_CLOCKEVENTS
260 select ARCH_WANT_OPTIONAL_GPIOLIB
261 select PLAT_VERSATILE
262 select PLAT_VERSATILE_CLCD
263 select ARM_TIMER_SP804
264 select GPIO_PL061 if GPIOLIB
266 This enables support for ARM Ltd RealView boards.
268 config ARCH_VERSATILE
269 bool "ARM Ltd. Versatile family"
273 select HAVE_MACH_CLKDEV
275 select GENERIC_CLOCKEVENTS
276 select ARCH_WANT_OPTIONAL_GPIOLIB
277 select PLAT_VERSATILE
278 select PLAT_VERSATILE_CLCD
279 select PLAT_VERSATILE_FPGA_IRQ
280 select ARM_TIMER_SP804
282 This enables support for ARM Ltd Versatile board.
285 bool "ARM Ltd. Versatile Express family"
286 select ARCH_WANT_OPTIONAL_GPIOLIB
288 select ARM_TIMER_SP804
290 select HAVE_MACH_CLKDEV
291 select GENERIC_CLOCKEVENTS
293 select HAVE_PATA_PLATFORM
295 select PLAT_VERSATILE
296 select PLAT_VERSATILE_CLCD
298 This enables support for the ARM Ltd Versatile Express boards.
302 select ARCH_REQUIRE_GPIOLIB
306 This enables support for systems based on the Atmel AT91RM9200,
307 AT91SAM9 and AT91CAP9 processors.
310 bool "Broadcom BCMRING"
314 select ARM_TIMER_SP804
316 select GENERIC_CLOCKEVENTS
317 select ARCH_WANT_OPTIONAL_GPIOLIB
319 Support for Broadcom's BCMRing platform.
322 bool "Cirrus Logic CLPS711x/EP721x-based"
324 select ARCH_USES_GETTIMEOFFSET
326 Support for Cirrus Logic 711x/721x based boards.
329 bool "Cavium Networks CNS3XXX family"
331 select GENERIC_CLOCKEVENTS
333 select MIGHT_HAVE_PCI
334 select PCI_DOMAINS if PCI
336 Support for Cavium Networks CNS3XXX platform.
339 bool "Cortina Systems Gemini"
341 select ARCH_REQUIRE_GPIOLIB
342 select ARCH_USES_GETTIMEOFFSET
344 Support for the Cortina Systems Gemini family SoCs
347 bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
351 select GENERIC_CLOCKEVENTS
353 select GENERIC_IRQ_CHIP
357 Support for CSR SiRFSoC ARM Cortex A9 Platform
364 select ARCH_USES_GETTIMEOFFSET
366 This is an evaluation board for the StrongARM processor available
367 from Digital. It has limited hardware on-board, including an
368 Ethernet interface, two PCMCIA sockets, two serial ports and a
377 select ARCH_REQUIRE_GPIOLIB
378 select ARCH_HAS_HOLES_MEMORYMODEL
379 select ARCH_USES_GETTIMEOFFSET
381 This enables support for the Cirrus EP93xx series of CPUs.
383 config ARCH_FOOTBRIDGE
387 select GENERIC_CLOCKEVENTS
390 Support for systems based on the DC21285 companion chip
391 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
394 bool "Freescale MXC/iMX-based"
395 select GENERIC_CLOCKEVENTS
396 select ARCH_REQUIRE_GPIOLIB
399 select GENERIC_IRQ_CHIP
400 select HAVE_SCHED_CLOCK
402 Support for Freescale MXC/iMX-based family of processors
405 bool "Freescale MXS-based"
406 select GENERIC_CLOCKEVENTS
407 select ARCH_REQUIRE_GPIOLIB
411 Support for Freescale MXS-based family of processors
414 bool "Hilscher NetX based"
418 select GENERIC_CLOCKEVENTS
420 This enables support for systems based on the Hilscher NetX Soc
423 bool "Hynix HMS720x-based"
426 select ARCH_USES_GETTIMEOFFSET
428 This enables support for systems based on the Hynix HMS720x
436 select ARCH_SUPPORTS_MSI
439 Support for Intel's IOP13XX (XScale) family of processors.
447 select ARCH_REQUIRE_GPIOLIB
449 Support for Intel's 80219 and IOP32X (XScale) family of
458 select ARCH_REQUIRE_GPIOLIB
460 Support for Intel's IOP33X (XScale) family of processors.
467 select ARCH_USES_GETTIMEOFFSET
469 Support for Intel's IXP23xx (XScale) family of processors.
472 bool "IXP2400/2800-based"
476 select ARCH_USES_GETTIMEOFFSET
478 Support for Intel's IXP2400/2800 (XScale) family of processors.
486 select GENERIC_CLOCKEVENTS
487 select HAVE_SCHED_CLOCK
488 select MIGHT_HAVE_PCI
489 select DMABOUNCE if PCI
491 Support for Intel's IXP4XX (XScale) family of processors.
497 select ARCH_REQUIRE_GPIOLIB
498 select GENERIC_CLOCKEVENTS
501 Support for the Marvell Dove SoC 88AP510
504 bool "Marvell Kirkwood"
507 select ARCH_REQUIRE_GPIOLIB
508 select GENERIC_CLOCKEVENTS
511 Support for the following Marvell Kirkwood series SoCs:
512 88F6180, 88F6192 and 88F6281.
518 select ARCH_REQUIRE_GPIOLIB
521 select USB_ARCH_HAS_OHCI
524 select GENERIC_CLOCKEVENTS
526 Support for the NXP LPC32XX family of processors
529 bool "Marvell MV78xx0"
532 select ARCH_REQUIRE_GPIOLIB
533 select GENERIC_CLOCKEVENTS
536 Support for the following Marvell MV78xx0 series SoCs:
544 select ARCH_REQUIRE_GPIOLIB
545 select GENERIC_CLOCKEVENTS
548 Support for the following Marvell Orion 5x series SoCs:
549 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
550 Orion-2 (5281), Orion-1-90 (6183).
553 bool "Marvell PXA168/910/MMP2"
555 select ARCH_REQUIRE_GPIOLIB
557 select GENERIC_CLOCKEVENTS
558 select HAVE_SCHED_CLOCK
563 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
566 bool "Micrel/Kendin KS8695"
568 select ARCH_REQUIRE_GPIOLIB
569 select ARCH_USES_GETTIMEOFFSET
571 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
572 System-on-Chip devices.
575 bool "Nuvoton W90X900 CPU"
577 select ARCH_REQUIRE_GPIOLIB
580 select GENERIC_CLOCKEVENTS
582 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
583 At present, the w90x900 has been renamed nuc900, regarding
584 the ARM series product line, you can login the following
585 link address to know more.
587 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
588 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
591 bool "Nuvoton NUC93X CPU"
595 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
596 low-power and high performance MPEG-4/JPEG multimedia controller chip.
603 select GENERIC_CLOCKEVENTS
606 select HAVE_SCHED_CLOCK
607 select ARCH_HAS_CPUFREQ
609 This enables support for NVIDIA Tegra based systems (Tegra APX,
610 Tegra 6xx and Tegra 2 series).
613 bool "Philips Nexperia PNX4008 Mobile"
616 select ARCH_USES_GETTIMEOFFSET
618 This enables support for Philips PNX4008 mobile platform.
621 bool "PXA2xx/PXA3xx-based"
624 select ARCH_HAS_CPUFREQ
627 select ARCH_REQUIRE_GPIOLIB
628 select GENERIC_CLOCKEVENTS
629 select HAVE_SCHED_CLOCK
634 select MULTI_IRQ_HANDLER
635 select ARM_CPU_SUSPEND if PM
638 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
643 select GENERIC_CLOCKEVENTS
644 select ARCH_REQUIRE_GPIOLIB
647 Support for Qualcomm MSM/QSD based systems. This runs on the
648 apps processor of the MSM/QSD and depends on a shared memory
649 interface to the modem processor which runs the baseband
650 stack and controls some vital subsystems
651 (clock and power control, etc).
654 bool "Renesas SH-Mobile / R-Mobile"
657 select HAVE_MACH_CLKDEV
658 select GENERIC_CLOCKEVENTS
661 select MULTI_IRQ_HANDLER
662 select PM_GENERIC_DOMAINS if PM
664 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
671 select ARCH_MAY_HAVE_PC_FDC
672 select HAVE_PATA_PLATFORM
675 select ARCH_SPARSEMEM_ENABLE
676 select ARCH_USES_GETTIMEOFFSET
679 On the Acorn Risc-PC, Linux can support the internal IDE disk and
680 CD-ROM interface, serial and parallel port, and the floppy drive.
687 select ARCH_SPARSEMEM_ENABLE
689 select ARCH_HAS_CPUFREQ
691 select GENERIC_CLOCKEVENTS
693 select HAVE_SCHED_CLOCK
695 select ARCH_REQUIRE_GPIOLIB
698 Support for StrongARM 11x0 based boards.
701 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
703 select ARCH_HAS_CPUFREQ
706 select ARCH_USES_GETTIMEOFFSET
707 select HAVE_S3C2410_I2C if I2C
709 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
710 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
711 the Samsung SMDK2410 development board (and derivatives).
713 Note, the S3C2416 and the S3C2450 are so close that they even share
714 the same SoC ID code. This means that there is no separate machine
715 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
718 bool "Samsung S3C64XX"
725 select ARCH_USES_GETTIMEOFFSET
726 select ARCH_HAS_CPUFREQ
727 select ARCH_REQUIRE_GPIOLIB
728 select SAMSUNG_CLKSRC
729 select SAMSUNG_IRQ_VIC_TIMER
730 select SAMSUNG_IRQ_UART
731 select S3C_GPIO_TRACK
732 select S3C_GPIO_PULL_UPDOWN
733 select S3C_GPIO_CFG_S3C24XX
734 select S3C_GPIO_CFG_S3C64XX
736 select USB_ARCH_HAS_OHCI
737 select SAMSUNG_GPIOLIB_4BIT
738 select HAVE_S3C2410_I2C if I2C
739 select HAVE_S3C2410_WATCHDOG if WATCHDOG
741 Samsung S3C64XX series based systems
744 bool "Samsung S5P6440 S5P6450"
750 select HAVE_S3C2410_WATCHDOG if WATCHDOG
751 select GENERIC_CLOCKEVENTS
752 select HAVE_SCHED_CLOCK
753 select HAVE_S3C2410_I2C if I2C
754 select HAVE_S3C_RTC if RTC_CLASS
756 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
760 bool "Samsung S5PC100"
765 select ARM_L1_CACHE_SHIFT_6
766 select ARCH_USES_GETTIMEOFFSET
767 select HAVE_S3C2410_I2C if I2C
768 select HAVE_S3C_RTC if RTC_CLASS
769 select HAVE_S3C2410_WATCHDOG if WATCHDOG
771 Samsung S5PC100 series based systems
774 bool "Samsung S5PV210/S5PC110"
776 select ARCH_SPARSEMEM_ENABLE
777 select ARCH_HAS_HOLES_MEMORYMODEL
782 select ARM_L1_CACHE_SHIFT_6
783 select ARCH_HAS_CPUFREQ
784 select GENERIC_CLOCKEVENTS
785 select HAVE_SCHED_CLOCK
786 select HAVE_S3C2410_I2C if I2C
787 select HAVE_S3C_RTC if RTC_CLASS
788 select HAVE_S3C2410_WATCHDOG if WATCHDOG
790 Samsung S5PV210/S5PC110 series based systems
793 bool "Samsung EXYNOS4"
795 select ARCH_SPARSEMEM_ENABLE
796 select ARCH_HAS_HOLES_MEMORYMODEL
800 select ARCH_HAS_CPUFREQ
801 select GENERIC_CLOCKEVENTS
802 select HAVE_S3C_RTC if RTC_CLASS
803 select HAVE_S3C2410_I2C if I2C
804 select HAVE_S3C2410_WATCHDOG if WATCHDOG
806 Samsung EXYNOS4 series based systems
815 select ARCH_USES_GETTIMEOFFSET
817 Support for the StrongARM based Digital DNARD machine, also known
818 as "Shark" (<http://www.shark-linux.de/shark.html>).
821 bool "Telechips TCC ARM926-based systems"
826 select GENERIC_CLOCKEVENTS
828 Support for Telechips TCC ARM926-based systems.
831 bool "ST-Ericsson U300 Series"
835 select HAVE_SCHED_CLOCK
839 select GENERIC_CLOCKEVENTS
841 select HAVE_MACH_CLKDEV
844 Support for ST-Ericsson U300 series mobile platforms.
847 bool "ST-Ericsson U8500 Series"
850 select GENERIC_CLOCKEVENTS
852 select ARCH_REQUIRE_GPIOLIB
853 select ARCH_HAS_CPUFREQ
855 Support for ST-Ericsson's Ux500 architecture
858 bool "STMicroelectronics Nomadik"
863 select GENERIC_CLOCKEVENTS
864 select ARCH_REQUIRE_GPIOLIB
866 Support for the Nomadik platform by ST-Ericsson
870 select GENERIC_CLOCKEVENTS
871 select ARCH_REQUIRE_GPIOLIB
875 select GENERIC_ALLOCATOR
876 select GENERIC_IRQ_CHIP
877 select ARCH_HAS_HOLES_MEMORYMODEL
879 Support for TI's DaVinci platform.
884 select ARCH_REQUIRE_GPIOLIB
885 select ARCH_HAS_CPUFREQ
887 select GENERIC_CLOCKEVENTS
888 select HAVE_SCHED_CLOCK
889 select ARCH_HAS_HOLES_MEMORYMODEL
891 Support for TI's OMAP platform (OMAP1/2/3/4).
896 select ARCH_REQUIRE_GPIOLIB
899 select GENERIC_CLOCKEVENTS
902 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
905 bool "VIA/WonderMedia 85xx"
908 select ARCH_HAS_CPUFREQ
909 select GENERIC_CLOCKEVENTS
910 select ARCH_REQUIRE_GPIOLIB
913 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
916 bool "Xilinx Zynq ARM Cortex A9 Platform"
919 select GENERIC_CLOCKEVENTS
926 Support for Xilinx Zynq ARM Cortex A9 Platform
930 # This is sorted alphabetically by mach-* pathname. However, plat-*
931 # Kconfigs may be included either alphabetically (according to the
932 # plat- suffix) or along side the corresponding mach-* source.
934 source "arch/arm/mach-at91/Kconfig"
936 source "arch/arm/mach-bcmring/Kconfig"
938 source "arch/arm/mach-clps711x/Kconfig"
940 source "arch/arm/mach-cns3xxx/Kconfig"
942 source "arch/arm/mach-davinci/Kconfig"
944 source "arch/arm/mach-dove/Kconfig"
946 source "arch/arm/mach-ep93xx/Kconfig"
948 source "arch/arm/mach-footbridge/Kconfig"
950 source "arch/arm/mach-gemini/Kconfig"
952 source "arch/arm/mach-h720x/Kconfig"
954 source "arch/arm/mach-integrator/Kconfig"
956 source "arch/arm/mach-iop32x/Kconfig"
958 source "arch/arm/mach-iop33x/Kconfig"
960 source "arch/arm/mach-iop13xx/Kconfig"
962 source "arch/arm/mach-ixp4xx/Kconfig"
964 source "arch/arm/mach-ixp2000/Kconfig"
966 source "arch/arm/mach-ixp23xx/Kconfig"
968 source "arch/arm/mach-kirkwood/Kconfig"
970 source "arch/arm/mach-ks8695/Kconfig"
972 source "arch/arm/mach-lpc32xx/Kconfig"
974 source "arch/arm/mach-msm/Kconfig"
976 source "arch/arm/mach-mv78xx0/Kconfig"
978 source "arch/arm/plat-mxc/Kconfig"
980 source "arch/arm/mach-mxs/Kconfig"
982 source "arch/arm/mach-netx/Kconfig"
984 source "arch/arm/mach-nomadik/Kconfig"
985 source "arch/arm/plat-nomadik/Kconfig"
987 source "arch/arm/mach-nuc93x/Kconfig"
989 source "arch/arm/plat-omap/Kconfig"
991 source "arch/arm/mach-omap1/Kconfig"
993 source "arch/arm/mach-omap2/Kconfig"
995 source "arch/arm/mach-orion5x/Kconfig"
997 source "arch/arm/mach-pxa/Kconfig"
998 source "arch/arm/plat-pxa/Kconfig"
1000 source "arch/arm/mach-mmp/Kconfig"
1002 source "arch/arm/mach-realview/Kconfig"
1004 source "arch/arm/mach-sa1100/Kconfig"
1006 source "arch/arm/plat-samsung/Kconfig"
1007 source "arch/arm/plat-s3c24xx/Kconfig"
1008 source "arch/arm/plat-s5p/Kconfig"
1010 source "arch/arm/plat-spear/Kconfig"
1012 source "arch/arm/plat-tcc/Kconfig"
1015 source "arch/arm/mach-s3c2410/Kconfig"
1016 source "arch/arm/mach-s3c2412/Kconfig"
1017 source "arch/arm/mach-s3c2416/Kconfig"
1018 source "arch/arm/mach-s3c2440/Kconfig"
1019 source "arch/arm/mach-s3c2443/Kconfig"
1023 source "arch/arm/mach-s3c64xx/Kconfig"
1026 source "arch/arm/mach-s5p64x0/Kconfig"
1028 source "arch/arm/mach-s5pc100/Kconfig"
1030 source "arch/arm/mach-s5pv210/Kconfig"
1032 source "arch/arm/mach-exynos4/Kconfig"
1034 source "arch/arm/mach-shmobile/Kconfig"
1036 source "arch/arm/mach-tegra/Kconfig"
1038 source "arch/arm/mach-u300/Kconfig"
1040 source "arch/arm/mach-ux500/Kconfig"
1042 source "arch/arm/mach-versatile/Kconfig"
1044 source "arch/arm/mach-vexpress/Kconfig"
1045 source "arch/arm/plat-versatile/Kconfig"
1047 source "arch/arm/mach-vt8500/Kconfig"
1049 source "arch/arm/mach-w90x900/Kconfig"
1051 # Definitions to make life easier
1057 select GENERIC_CLOCKEVENTS
1058 select HAVE_SCHED_CLOCK
1063 select GENERIC_IRQ_CHIP
1064 select HAVE_SCHED_CLOCK
1069 config PLAT_VERSATILE
1072 config ARM_TIMER_SP804
1076 source arch/arm/mm/Kconfig
1079 bool "Enable iWMMXt support"
1080 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1081 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1083 Enable support for iWMMXt context switching at run time if
1084 running on a CPU that supports it.
1086 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
1089 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
1093 depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
1094 (!ARCH_OMAP3 || OMAP3_EMU)
1098 config MULTI_IRQ_HANDLER
1101 Allow each machine to specify it's own IRQ handler at run time.
1104 source "arch/arm/Kconfig-nommu"
1107 config ARM_ERRATA_411920
1108 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1109 depends on CPU_V6 || CPU_V6K
1111 Invalidation of the Instruction Cache operation can
1112 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1113 It does not affect the MPCore. This option enables the ARM Ltd.
1114 recommended workaround.
1116 config ARM_ERRATA_430973
1117 bool "ARM errata: Stale prediction on replaced interworking branch"
1120 This option enables the workaround for the 430973 Cortex-A8
1121 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1122 interworking branch is replaced with another code sequence at the
1123 same virtual address, whether due to self-modifying code or virtual
1124 to physical address re-mapping, Cortex-A8 does not recover from the
1125 stale interworking branch prediction. This results in Cortex-A8
1126 executing the new code sequence in the incorrect ARM or Thumb state.
1127 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1128 and also flushes the branch target cache at every context switch.
1129 Note that setting specific bits in the ACTLR register may not be
1130 available in non-secure mode.
1132 config ARM_ERRATA_458693
1133 bool "ARM errata: Processor deadlock when a false hazard is created"
1136 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1137 erratum. For very specific sequences of memory operations, it is
1138 possible for a hazard condition intended for a cache line to instead
1139 be incorrectly associated with a different cache line. This false
1140 hazard might then cause a processor deadlock. The workaround enables
1141 the L1 caching of the NEON accesses and disables the PLD instruction
1142 in the ACTLR register. Note that setting specific bits in the ACTLR
1143 register may not be available in non-secure mode.
1145 config ARM_ERRATA_460075
1146 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1149 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1150 erratum. Any asynchronous access to the L2 cache may encounter a
1151 situation in which recent store transactions to the L2 cache are lost
1152 and overwritten with stale memory contents from external memory. The
1153 workaround disables the write-allocate mode for the L2 cache via the
1154 ACTLR register. Note that setting specific bits in the ACTLR register
1155 may not be available in non-secure mode.
1157 config ARM_ERRATA_742230
1158 bool "ARM errata: DMB operation may be faulty"
1159 depends on CPU_V7 && SMP
1161 This option enables the workaround for the 742230 Cortex-A9
1162 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1163 between two write operations may not ensure the correct visibility
1164 ordering of the two writes. This workaround sets a specific bit in
1165 the diagnostic register of the Cortex-A9 which causes the DMB
1166 instruction to behave as a DSB, ensuring the correct behaviour of
1169 config ARM_ERRATA_742231
1170 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1171 depends on CPU_V7 && SMP
1173 This option enables the workaround for the 742231 Cortex-A9
1174 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1175 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1176 accessing some data located in the same cache line, may get corrupted
1177 data due to bad handling of the address hazard when the line gets
1178 replaced from one of the CPUs at the same time as another CPU is
1179 accessing it. This workaround sets specific bits in the diagnostic
1180 register of the Cortex-A9 which reduces the linefill issuing
1181 capabilities of the processor.
1183 config PL310_ERRATA_588369
1184 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1185 depends on CACHE_L2X0
1187 The PL310 L2 cache controller implements three types of Clean &
1188 Invalidate maintenance operations: by Physical Address
1189 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1190 They are architecturally defined to behave as the execution of a
1191 clean operation followed immediately by an invalidate operation,
1192 both performing to the same memory location. This functionality
1193 is not correctly implemented in PL310 as clean lines are not
1194 invalidated as a result of these operations.
1196 config ARM_ERRATA_720789
1197 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1198 depends on CPU_V7 && SMP
1200 This option enables the workaround for the 720789 Cortex-A9 (prior to
1201 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1202 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1203 As a consequence of this erratum, some TLB entries which should be
1204 invalidated are not, resulting in an incoherency in the system page
1205 tables. The workaround changes the TLB flushing routines to invalidate
1206 entries regardless of the ASID.
1208 config PL310_ERRATA_727915
1209 bool "Background Clean & Invalidate by Way operation can cause data corruption"
1210 depends on CACHE_L2X0
1212 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1213 operation (offset 0x7FC). This operation runs in background so that
1214 PL310 can handle normal accesses while it is in progress. Under very
1215 rare circumstances, due to this erratum, write data can be lost when
1216 PL310 treats a cacheable write transaction during a Clean &
1217 Invalidate by Way operation.
1219 config ARM_ERRATA_743622
1220 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1223 This option enables the workaround for the 743622 Cortex-A9
1224 (r2p0..r2p2) erratum. Under very rare conditions, a faulty
1225 optimisation in the Cortex-A9 Store Buffer may lead to data
1226 corruption. This workaround sets a specific bit in the diagnostic
1227 register of the Cortex-A9 which disables the Store Buffer
1228 optimisation, preventing the defect from occurring. This has no
1229 visible impact on the overall performance or power consumption of the
1232 config ARM_ERRATA_751472
1233 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1234 depends on CPU_V7 && SMP
1236 This option enables the workaround for the 751472 Cortex-A9 (prior
1237 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1238 completion of a following broadcasted operation if the second
1239 operation is received by a CPU before the ICIALLUIS has completed,
1240 potentially leading to corrupted entries in the cache or TLB.
1242 config ARM_ERRATA_753970
1243 bool "ARM errata: cache sync operation may be faulty"
1244 depends on CACHE_PL310
1246 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1248 Under some condition the effect of cache sync operation on
1249 the store buffer still remains when the operation completes.
1250 This means that the store buffer is always asked to drain and
1251 this prevents it from merging any further writes. The workaround
1252 is to replace the normal offset of cache sync operation (0x730)
1253 by another offset targeting an unmapped PL310 register 0x740.
1254 This has the same effect as the cache sync operation: store buffer
1255 drain and waiting for all buffers empty.
1257 config ARM_ERRATA_754322
1258 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1261 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1262 r3p*) erratum. A speculative memory access may cause a page table walk
1263 which starts prior to an ASID switch but completes afterwards. This
1264 can populate the micro-TLB with a stale entry which may be hit with
1265 the new ASID. This workaround places two dsb instructions in the mm
1266 switching code so that no page table walks can cross the ASID switch.
1268 config ARM_ERRATA_754327
1269 bool "ARM errata: no automatic Store Buffer drain"
1270 depends on CPU_V7 && SMP
1272 This option enables the workaround for the 754327 Cortex-A9 (prior to
1273 r2p0) erratum. The Store Buffer does not have any automatic draining
1274 mechanism and therefore a livelock may occur if an external agent
1275 continuously polls a memory location waiting to observe an update.
1276 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1277 written polling loops from denying visibility of updates to memory.
1279 config ARM_ERRATA_364296
1280 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1281 depends on CPU_V6 && !SMP
1283 This options enables the workaround for the 364296 ARM1136
1284 r0p2 erratum (possible cache data corruption with
1285 hit-under-miss enabled). It sets the undocumented bit 31 in
1286 the auxiliary control register and the FI bit in the control
1287 register, thus disabling hit-under-miss without putting the
1288 processor into full low interrupt latency mode. ARM11MPCore
1291 config ARM_ERRATA_764369
1292 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1293 depends on CPU_V7 && SMP
1295 This option enables the workaround for erratum 764369
1296 affecting Cortex-A9 MPCore with two or more processors (all
1297 current revisions). Under certain timing circumstances, a data
1298 cache line maintenance operation by MVA targeting an Inner
1299 Shareable memory region may fail to proceed up to either the
1300 Point of Coherency or to the Point of Unification of the
1301 system. This workaround adds a DSB instruction before the
1302 relevant cache maintenance functions and sets a specific bit
1303 in the diagnostic control register of the SCU.
1307 source "arch/arm/common/Kconfig"
1317 Find out whether you have ISA slots on your motherboard. ISA is the
1318 name of a bus system, i.e. the way the CPU talks to the other stuff
1319 inside your box. Other bus systems are PCI, EISA, MicroChannel
1320 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1321 newer boards don't support it. If you have ISA, say Y, otherwise N.
1323 # Select ISA DMA controller support
1328 # Select ISA DMA interface
1333 bool "PCI support" if MIGHT_HAVE_PCI
1335 Find out whether you have a PCI motherboard. PCI is the name of a
1336 bus system, i.e. the way the CPU talks to the other stuff inside
1337 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1338 VESA. If you have PCI, say Y, otherwise N.
1344 config PCI_NANOENGINE
1345 bool "BSE nanoEngine PCI support"
1346 depends on SA1100_NANOENGINE
1348 Enable PCI on the BSE nanoEngine board.
1353 # Select the host bridge type
1354 config PCI_HOST_VIA82C505
1356 depends on PCI && ARCH_SHARK
1359 config PCI_HOST_ITE8152
1361 depends on PCI && MACH_ARMCORE
1365 source "drivers/pci/Kconfig"
1367 source "drivers/pcmcia/Kconfig"
1371 menu "Kernel Features"
1373 source "kernel/time/Kconfig"
1376 bool "Symmetric Multi-Processing"
1377 depends on CPU_V6K || CPU_V7
1378 depends on GENERIC_CLOCKEVENTS
1379 depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
1380 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1381 ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
1382 ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE
1384 select USE_GENERIC_SMP_HELPERS
1385 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1387 This enables support for systems with more than one CPU. If you have
1388 a system with only one CPU, like most personal computers, say N. If
1389 you have a system with more than one CPU, say Y.
1391 If you say N here, the kernel will run on single and multiprocessor
1392 machines, but will use only one CPU of a multiprocessor machine. If
1393 you say Y here, the kernel will run on many, but not all, single
1394 processor machines. On a single processor machine, the kernel will
1395 run faster if you say N here.
1397 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1398 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1399 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1401 If you don't know what to do here, say N.
1404 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1405 depends on EXPERIMENTAL
1406 depends on SMP && !XIP_KERNEL
1409 SMP kernels contain instructions which fail on non-SMP processors.
1410 Enabling this option allows the kernel to modify itself to make
1411 these instructions safe. Disabling it allows about 1K of space
1414 If you don't know what to do here, say Y.
1416 config ARM_CPU_TOPOLOGY
1417 bool "Support cpu topology definition"
1418 depends on SMP && CPU_V7
1421 Support ARM cpu topology definition. The MPIDR register defines
1422 affinity between processors which is then used to describe the cpu
1423 topology of an ARM System.
1426 bool "Multi-core scheduler support"
1427 depends on ARM_CPU_TOPOLOGY
1429 Multi-core scheduler support improves the CPU scheduler's decision
1430 making when dealing with multi-core CPU chips at a cost of slightly
1431 increased overhead in some places. If unsure say N here.
1434 bool "SMT scheduler support"
1435 depends on ARM_CPU_TOPOLOGY
1437 Improves the CPU scheduler's decision making when dealing with
1438 MultiThreading at a cost of slightly increased overhead in some
1439 places. If unsure say N here.
1444 This option enables support for the ARM system coherency unit
1451 This options enables support for the ARM timer and watchdog unit
1454 prompt "Memory split"
1457 Select the desired split between kernel and user memory.
1459 If you are not absolutely sure what you are doing, leave this
1463 bool "3G/1G user/kernel split"
1465 bool "2G/2G user/kernel split"
1467 bool "1G/3G user/kernel split"
1472 default 0x40000000 if VMSPLIT_1G
1473 default 0x80000000 if VMSPLIT_2G
1477 int "Maximum number of CPUs (2-32)"
1483 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1484 depends on SMP && HOTPLUG && EXPERIMENTAL
1486 Say Y here to experiment with turning CPUs off and on. CPUs
1487 can be controlled through /sys/devices/system/cpu.
1490 bool "Use local timer interrupts"
1493 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1495 Enable support for local timers on SMP platforms, rather then the
1496 legacy IPI broadcast method. Local timers allows the system
1497 accounting to be spread across the timer interval, preventing a
1498 "thundering herd" at every timer tick.
1500 source kernel/Kconfig.preempt
1504 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
1505 ARCH_S5PV210 || ARCH_EXYNOS4
1506 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1507 default AT91_TIMER_HZ if ARCH_AT91
1508 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1511 config THUMB2_KERNEL
1512 bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
1513 depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
1515 select ARM_ASM_UNIFIED
1518 By enabling this option, the kernel will be compiled in
1519 Thumb-2 mode. A compiler/assembler that understand the unified
1520 ARM-Thumb syntax is needed.
1524 config THUMB2_AVOID_R_ARM_THM_JUMP11
1525 bool "Work around buggy Thumb-2 short branch relocations in gas"
1526 depends on THUMB2_KERNEL && MODULES
1529 Various binutils versions can resolve Thumb-2 branches to
1530 locally-defined, preemptible global symbols as short-range "b.n"
1531 branch instructions.
1533 This is a problem, because there's no guarantee the final
1534 destination of the symbol, or any candidate locations for a
1535 trampoline, are within range of the branch. For this reason, the
1536 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1537 relocation in modules at all, and it makes little sense to add
1540 The symptom is that the kernel fails with an "unsupported
1541 relocation" error when loading some modules.
1543 Until fixed tools are available, passing
1544 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1545 code which hits this problem, at the cost of a bit of extra runtime
1546 stack usage in some cases.
1548 The problem is described in more detail at:
1549 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1551 Only Thumb-2 kernels are affected.
1553 Unless you are sure your tools don't have this problem, say Y.
1555 config ARM_ASM_UNIFIED
1559 bool "Use the ARM EABI to compile the kernel"
1561 This option allows for the kernel to be compiled using the latest
1562 ARM ABI (aka EABI). This is only useful if you are using a user
1563 space environment that is also compiled with EABI.
1565 Since there are major incompatibilities between the legacy ABI and
1566 EABI, especially with regard to structure member alignment, this
1567 option also changes the kernel syscall calling convention to
1568 disambiguate both ABIs and allow for backward compatibility support
1569 (selected with CONFIG_OABI_COMPAT).
1571 To use this you need GCC version 4.0.0 or later.
1574 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1575 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1578 This option preserves the old syscall interface along with the
1579 new (ARM EABI) one. It also provides a compatibility layer to
1580 intercept syscalls that have structure arguments which layout
1581 in memory differs between the legacy ABI and the new ARM EABI
1582 (only for non "thumb" binaries). This option adds a tiny
1583 overhead to all syscalls and produces a slightly larger kernel.
1584 If you know you'll be using only pure EABI user space then you
1585 can say N here. If this option is not selected and you attempt
1586 to execute a legacy ABI binary then the result will be
1587 UNPREDICTABLE (in fact it can be predicted that it won't work
1588 at all). If in doubt say Y.
1590 config ARCH_HAS_HOLES_MEMORYMODEL
1593 config ARCH_SPARSEMEM_ENABLE
1596 config ARCH_SPARSEMEM_DEFAULT
1597 def_bool ARCH_SPARSEMEM_ENABLE
1599 config ARCH_SELECT_MEMORY_MODEL
1600 def_bool ARCH_SPARSEMEM_ENABLE
1602 config HAVE_ARCH_PFN_VALID
1603 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1606 bool "High Memory Support"
1609 The address space of ARM processors is only 4 Gigabytes large
1610 and it has to accommodate user address space, kernel address
1611 space as well as some memory mapped IO. That means that, if you
1612 have a large amount of physical memory and/or IO, not all of the
1613 memory can be "permanently mapped" by the kernel. The physical
1614 memory that is not permanently mapped is called "high memory".
1616 Depending on the selected kernel/user memory split, minimum
1617 vmalloc space and actual amount of RAM, you may not need this
1618 option which should result in a slightly faster kernel.
1623 bool "Allocate 2nd-level pagetables from highmem"
1626 config HW_PERF_EVENTS
1627 bool "Enable hardware performance counter support for perf events"
1628 depends on PERF_EVENTS && CPU_HAS_PMU
1631 Enable hardware performance counter support for perf events. If
1632 disabled, perf events will use software events only.
1636 config FORCE_MAX_ZONEORDER
1637 int "Maximum zone order" if ARCH_SHMOBILE
1638 range 11 64 if ARCH_SHMOBILE
1639 default "9" if SA1111
1642 The kernel memory allocator divides physically contiguous memory
1643 blocks into "zones", where each zone is a power of two number of
1644 pages. This option selects the largest power of two that the kernel
1645 keeps in the memory allocator. If you need to allocate very large
1646 blocks of physically contiguous memory, then you may need to
1647 increase this value.
1649 This config option is actually maximum order plus one. For example,
1650 a value of 11 means that the largest free memory block is 2^10 pages.
1653 bool "Timer and CPU usage LEDs"
1654 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1655 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1656 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1657 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1658 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1659 ARCH_AT91 || ARCH_DAVINCI || \
1660 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1662 If you say Y here, the LEDs on your machine will be used
1663 to provide useful information about your current system status.
1665 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1666 be able to select which LEDs are active using the options below. If
1667 you are compiling a kernel for the EBSA-110 or the LART however, the
1668 red LED will simply flash regularly to indicate that the system is
1669 still functional. It is safe to say Y here if you have a CATS
1670 system, but the driver will do nothing.
1673 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1674 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1675 || MACH_OMAP_PERSEUS2
1677 depends on !GENERIC_CLOCKEVENTS
1678 default y if ARCH_EBSA110
1680 If you say Y here, one of the system LEDs (the green one on the
1681 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1682 will flash regularly to indicate that the system is still
1683 operational. This is mainly useful to kernel hackers who are
1684 debugging unstable kernels.
1686 The LART uses the same LED for both Timer LED and CPU usage LED
1687 functions. You may choose to use both, but the Timer LED function
1688 will overrule the CPU usage LED.
1691 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1693 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1694 || MACH_OMAP_PERSEUS2
1697 If you say Y here, the red LED will be used to give a good real
1698 time indication of CPU usage, by lighting whenever the idle task
1699 is not currently executing.
1701 The LART uses the same LED for both Timer LED and CPU usage LED
1702 functions. You may choose to use both, but the Timer LED function
1703 will overrule the CPU usage LED.
1705 config ALIGNMENT_TRAP
1707 depends on CPU_CP15_MMU
1708 default y if !ARCH_EBSA110
1709 select HAVE_PROC_CPU if PROC_FS
1711 ARM processors cannot fetch/store information which is not
1712 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1713 address divisible by 4. On 32-bit ARM processors, these non-aligned
1714 fetch/store instructions will be emulated in software if you say
1715 here, which has a severe performance impact. This is necessary for
1716 correct operation of some network protocols. With an IP-only
1717 configuration it is safe to say N, otherwise say Y.
1719 config UACCESS_WITH_MEMCPY
1720 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1721 depends on MMU && EXPERIMENTAL
1722 default y if CPU_FEROCEON
1724 Implement faster copy_to_user and clear_user methods for CPU
1725 cores where a 8-word STM instruction give significantly higher
1726 memory write throughput than a sequence of individual 32bit stores.
1728 A possible side effect is a slight increase in scheduling latency
1729 between threads sharing the same address space if they invoke
1730 such copy operations with large buffers.
1732 However, if the CPU data cache is using a write-allocate mode,
1733 this option is unlikely to provide any performance gain.
1737 prompt "Enable seccomp to safely compute untrusted bytecode"
1739 This kernel feature is useful for number crunching applications
1740 that may need to compute untrusted bytecode during their
1741 execution. By using pipes or other transports made available to
1742 the process as file descriptors supporting the read/write
1743 syscalls, it's possible to isolate those applications in
1744 their own address space using seccomp. Once seccomp is
1745 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1746 and the task is only allowed to execute a few safe syscalls
1747 defined by each seccomp mode.
1749 config CC_STACKPROTECTOR
1750 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1751 depends on EXPERIMENTAL
1753 This option turns on the -fstack-protector GCC feature. This
1754 feature puts, at the beginning of functions, a canary value on
1755 the stack just before the return address, and validates
1756 the value just before actually returning. Stack based buffer
1757 overflows (that need to overwrite this return address) now also
1758 overwrite the canary, which gets detected and the attack is then
1759 neutralized via a kernel panic.
1760 This feature requires gcc version 4.2 or above.
1762 config DEPRECATED_PARAM_STRUCT
1763 bool "Provide old way to pass kernel parameters"
1765 This was deprecated in 2001 and announced to live on for 5 years.
1766 Some old boot loaders still use this way.
1773 bool "Flattened Device Tree support"
1775 select OF_EARLY_FLATTREE
1778 Include support for flattened device tree machine descriptions.
1780 # Compressed boot loader in ROM. Yes, we really want to ask about
1781 # TEXT and BSS so we preserve their values in the config files.
1782 config ZBOOT_ROM_TEXT
1783 hex "Compressed ROM boot loader base address"
1786 The physical address at which the ROM-able zImage is to be
1787 placed in the target. Platforms which normally make use of
1788 ROM-able zImage formats normally set this to a suitable
1789 value in their defconfig file.
1791 If ZBOOT_ROM is not enabled, this has no effect.
1793 config ZBOOT_ROM_BSS
1794 hex "Compressed ROM boot loader BSS address"
1797 The base address of an area of read/write memory in the target
1798 for the ROM-able zImage which must be available while the
1799 decompressor is running. It must be large enough to hold the
1800 entire decompressed kernel plus an additional 128 KiB.
1801 Platforms which normally make use of ROM-able zImage formats
1802 normally set this to a suitable value in their defconfig file.
1804 If ZBOOT_ROM is not enabled, this has no effect.
1807 bool "Compressed boot loader in ROM/flash"
1808 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1810 Say Y here if you intend to execute your compressed kernel image
1811 (zImage) directly from ROM or flash. If unsure, say N.
1814 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1815 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1816 default ZBOOT_ROM_NONE
1818 Include experimental SD/MMC loading code in the ROM-able zImage.
1819 With this enabled it is possible to write the the ROM-able zImage
1820 kernel image to an MMC or SD card and boot the kernel straight
1821 from the reset vector. At reset the processor Mask ROM will load
1822 the first part of the the ROM-able zImage which in turn loads the
1823 rest the kernel image to RAM.
1825 config ZBOOT_ROM_NONE
1826 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1828 Do not load image from SD or MMC
1830 config ZBOOT_ROM_MMCIF
1831 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1833 Load image from MMCIF hardware block.
1835 config ZBOOT_ROM_SH_MOBILE_SDHI
1836 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1838 Load image from SDHI hardware block
1843 string "Default kernel command string"
1846 On some architectures (EBSA110 and CATS), there is currently no way
1847 for the boot loader to pass arguments to the kernel. For these
1848 architectures, you should supply some command-line options at build
1849 time by entering them here. As a minimum, you should specify the
1850 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1853 prompt "Kernel command line type" if CMDLINE != ""
1854 default CMDLINE_FROM_BOOTLOADER
1856 config CMDLINE_FROM_BOOTLOADER
1857 bool "Use bootloader kernel arguments if available"
1859 Uses the command-line options passed by the boot loader. If
1860 the boot loader doesn't provide any, the default kernel command
1861 string provided in CMDLINE will be used.
1863 config CMDLINE_EXTEND
1864 bool "Extend bootloader kernel arguments"
1866 The command-line arguments provided by the boot loader will be
1867 appended to the default kernel command string.
1869 config CMDLINE_FORCE
1870 bool "Always use the default kernel command string"
1872 Always use the default kernel command string, even if the boot
1873 loader passes other arguments to the kernel.
1874 This is useful if you cannot or don't want to change the
1875 command-line options your boot loader passes to the kernel.
1879 bool "Kernel Execute-In-Place from ROM"
1880 depends on !ZBOOT_ROM
1882 Execute-In-Place allows the kernel to run from non-volatile storage
1883 directly addressable by the CPU, such as NOR flash. This saves RAM
1884 space since the text section of the kernel is not loaded from flash
1885 to RAM. Read-write sections, such as the data section and stack,
1886 are still copied to RAM. The XIP kernel is not compressed since
1887 it has to run directly from flash, so it will take more space to
1888 store it. The flash address used to link the kernel object files,
1889 and for storing it, is configuration dependent. Therefore, if you
1890 say Y here, you must know the proper physical address where to
1891 store the kernel image depending on your own flash memory usage.
1893 Also note that the make target becomes "make xipImage" rather than
1894 "make zImage" or "make Image". The final kernel binary to put in
1895 ROM memory will be arch/arm/boot/xipImage.
1899 config XIP_PHYS_ADDR
1900 hex "XIP Kernel Physical Location"
1901 depends on XIP_KERNEL
1902 default "0x00080000"
1904 This is the physical address in your flash memory the kernel will
1905 be linked for and stored to. This address is dependent on your
1909 bool "Kexec system call (EXPERIMENTAL)"
1910 depends on EXPERIMENTAL
1912 kexec is a system call that implements the ability to shutdown your
1913 current kernel, and to start another kernel. It is like a reboot
1914 but it is independent of the system firmware. And like a reboot
1915 you can start any kernel with it, not just Linux.
1917 It is an ongoing process to be certain the hardware in a machine
1918 is properly shutdown, so do not be surprised if this code does not
1919 initially work for you. It may help to enable device hotplugging
1923 bool "Export atags in procfs"
1927 Should the atags used to boot the kernel be exported in an "atags"
1928 file in procfs. Useful with kexec.
1931 bool "Build kdump crash kernel (EXPERIMENTAL)"
1932 depends on EXPERIMENTAL
1934 Generate crash dump after being started by kexec. This should
1935 be normally only set in special crash dump kernels which are
1936 loaded in the main kernel with kexec-tools into a specially
1937 reserved region and then later executed after a crash by
1938 kdump/kexec. The crash dump kernel must be compiled to a
1939 memory address not used by the main kernel
1941 For more details see Documentation/kdump/kdump.txt
1943 config AUTO_ZRELADDR
1944 bool "Auto calculation of the decompressed kernel image address"
1945 depends on !ZBOOT_ROM && !ARCH_U300
1947 ZRELADDR is the physical address where the decompressed kernel
1948 image will be placed. If AUTO_ZRELADDR is selected, the address
1949 will be determined at run-time by masking the current IP with
1950 0xf8000000. This assumes the zImage being placed in the first 128MB
1951 from start of memory.
1955 menu "CPU Power Management"
1959 source "drivers/cpufreq/Kconfig"
1962 tristate "CPUfreq driver for i.MX CPUs"
1963 depends on ARCH_MXC && CPU_FREQ
1965 This enables the CPUfreq driver for i.MX CPUs.
1967 config CPU_FREQ_SA1100
1970 config CPU_FREQ_SA1110
1973 config CPU_FREQ_INTEGRATOR
1974 tristate "CPUfreq driver for ARM Integrator CPUs"
1975 depends on ARCH_INTEGRATOR && CPU_FREQ
1978 This enables the CPUfreq driver for ARM Integrator CPUs.
1980 For details, take a look at <file:Documentation/cpu-freq>.
1986 depends on CPU_FREQ && ARCH_PXA && PXA25x
1988 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1993 Internal configuration node for common cpufreq on Samsung SoC
1995 config CPU_FREQ_S3C24XX
1996 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
1997 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
2000 This enables the CPUfreq driver for the Samsung S3C24XX family
2003 For details, take a look at <file:Documentation/cpu-freq>.
2007 config CPU_FREQ_S3C24XX_PLL
2008 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
2009 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
2011 Compile in support for changing the PLL frequency from the
2012 S3C24XX series CPUfreq driver. The PLL takes time to settle
2013 after a frequency change, so by default it is not enabled.
2015 This also means that the PLL tables for the selected CPU(s) will
2016 be built which may increase the size of the kernel image.
2018 config CPU_FREQ_S3C24XX_DEBUG
2019 bool "Debug CPUfreq Samsung driver core"
2020 depends on CPU_FREQ_S3C24XX
2022 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
2024 config CPU_FREQ_S3C24XX_IODEBUG
2025 bool "Debug CPUfreq Samsung driver IO timing"
2026 depends on CPU_FREQ_S3C24XX
2028 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
2030 config CPU_FREQ_S3C24XX_DEBUGFS
2031 bool "Export debugfs for CPUFreq"
2032 depends on CPU_FREQ_S3C24XX && DEBUG_FS
2034 Export status information via debugfs.
2038 source "drivers/cpuidle/Kconfig"
2042 menu "Floating point emulation"
2044 comment "At least one emulation must be selected"
2047 bool "NWFPE math emulation"
2048 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2050 Say Y to include the NWFPE floating point emulator in the kernel.
2051 This is necessary to run most binaries. Linux does not currently
2052 support floating point hardware so you need to say Y here even if
2053 your machine has an FPA or floating point co-processor podule.
2055 You may say N here if you are going to load the Acorn FPEmulator
2056 early in the bootup.
2059 bool "Support extended precision"
2060 depends on FPE_NWFPE
2062 Say Y to include 80-bit support in the kernel floating-point
2063 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2064 Note that gcc does not generate 80-bit operations by default,
2065 so in most cases this option only enlarges the size of the
2066 floating point emulator without any good reason.
2068 You almost surely want to say N here.
2071 bool "FastFPE math emulation (EXPERIMENTAL)"
2072 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2074 Say Y here to include the FAST floating point emulator in the kernel.
2075 This is an experimental much faster emulator which now also has full
2076 precision for the mantissa. It does not support any exceptions.
2077 It is very simple, and approximately 3-6 times faster than NWFPE.
2079 It should be sufficient for most programs. It may be not suitable
2080 for scientific calculations, but you have to check this for yourself.
2081 If you do not feel you need a faster FP emulation you should better
2085 bool "VFP-format floating point maths"
2086 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2088 Say Y to include VFP support code in the kernel. This is needed
2089 if your hardware includes a VFP unit.
2091 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2092 release notes and additional status information.
2094 Say N if your target does not have VFP hardware.
2102 bool "Advanced SIMD (NEON) Extension support"
2103 depends on VFPv3 && CPU_V7
2105 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2110 menu "Userspace binary formats"
2112 source "fs/Kconfig.binfmt"
2115 tristate "RISC OS personality"
2118 Say Y here to include the kernel code necessary if you want to run
2119 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2120 experimental; if this sounds frightening, say N and sleep in peace.
2121 You can also say M here to compile this support as a module (which
2122 will be called arthur).
2126 menu "Power management options"
2128 source "kernel/power/Kconfig"
2130 config ARCH_SUSPEND_POSSIBLE
2131 depends on !ARCH_S5P64X0 && !ARCH_S5PC100
2132 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2133 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
2136 config ARM_CPU_SUSPEND
2141 source "net/Kconfig"
2143 source "drivers/Kconfig"
2147 source "arch/arm/Kconfig.debug"
2149 source "security/Kconfig"
2151 source "crypto/Kconfig"
2153 source "lib/Kconfig"