5 select HAVE_DMA_API_DEBUG
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"
199 depends on !XIP_KERNEL && MMU
200 depends on !ARCH_REALVIEW || !SPARSEMEM
202 Patch phys-to-virt and virt-to-phys translation functions at
203 boot and module load time according to the position of the
204 kernel in system memory.
206 This can only be used with non-XIP MMU kernels where the base
207 of physical memory is at a 16MB boundary, or theoretically 64K
208 for the MSM machine class.
210 config ARM_PATCH_PHYS_VIRT_16BIT
212 depends on ARM_PATCH_PHYS_VIRT && ARCH_MSM
214 This option extends the physical to virtual translation patching
215 to allow physical memory down to a theoretical minimum of 64K
218 source "init/Kconfig"
220 source "kernel/Kconfig.freezer"
225 bool "MMU-based Paged Memory Management Support"
228 Select if you want MMU-based virtualised addressing space
229 support by paged memory management. If unsure, say 'Y'.
232 # The "ARM system type" choice list is ordered alphabetically by option
233 # text. Please add new entries in the option alphabetic order.
236 prompt "ARM system type"
237 default ARCH_VERSATILE
239 config ARCH_INTEGRATOR
240 bool "ARM Ltd. Integrator family"
242 select ARCH_HAS_CPUFREQ
244 select HAVE_MACH_CLKDEV
246 select GENERIC_CLOCKEVENTS
247 select PLAT_VERSATILE
248 select PLAT_VERSATILE_FPGA_IRQ
250 Support for ARM's Integrator platform.
253 bool "ARM Ltd. RealView family"
256 select HAVE_MACH_CLKDEV
258 select GENERIC_CLOCKEVENTS
259 select ARCH_WANT_OPTIONAL_GPIOLIB
260 select PLAT_VERSATILE
261 select PLAT_VERSATILE_CLCD
262 select ARM_TIMER_SP804
263 select GPIO_PL061 if GPIOLIB
265 This enables support for ARM Ltd RealView boards.
267 config ARCH_VERSATILE
268 bool "ARM Ltd. Versatile family"
272 select HAVE_MACH_CLKDEV
274 select GENERIC_CLOCKEVENTS
275 select ARCH_WANT_OPTIONAL_GPIOLIB
276 select PLAT_VERSATILE
277 select PLAT_VERSATILE_CLCD
278 select PLAT_VERSATILE_FPGA_IRQ
279 select ARM_TIMER_SP804
281 This enables support for ARM Ltd Versatile board.
284 bool "ARM Ltd. Versatile Express family"
285 select ARCH_WANT_OPTIONAL_GPIOLIB
287 select ARM_TIMER_SP804
289 select HAVE_MACH_CLKDEV
290 select GENERIC_CLOCKEVENTS
292 select HAVE_PATA_PLATFORM
294 select PLAT_VERSATILE
295 select PLAT_VERSATILE_CLCD
297 This enables support for the ARM Ltd Versatile Express boards.
301 select ARCH_REQUIRE_GPIOLIB
304 select ARM_PATCH_PHYS_VIRT if MMU
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
389 Support for systems based on the DC21285 companion chip
390 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
393 bool "Freescale MXC/iMX-based"
394 select GENERIC_CLOCKEVENTS
395 select ARCH_REQUIRE_GPIOLIB
398 select GENERIC_IRQ_CHIP
399 select HAVE_SCHED_CLOCK
401 Support for Freescale MXC/iMX-based family of processors
404 bool "Freescale MXS-based"
405 select GENERIC_CLOCKEVENTS
406 select ARCH_REQUIRE_GPIOLIB
410 Support for Freescale MXS-based family of processors
413 bool "Hilscher NetX based"
417 select GENERIC_CLOCKEVENTS
419 This enables support for systems based on the Hilscher NetX Soc
422 bool "Hynix HMS720x-based"
425 select ARCH_USES_GETTIMEOFFSET
427 This enables support for systems based on the Hynix HMS720x
435 select ARCH_SUPPORTS_MSI
438 Support for Intel's IOP13XX (XScale) family of processors.
446 select ARCH_REQUIRE_GPIOLIB
448 Support for Intel's 80219 and IOP32X (XScale) family of
457 select ARCH_REQUIRE_GPIOLIB
459 Support for Intel's IOP33X (XScale) family of processors.
466 select ARCH_USES_GETTIMEOFFSET
468 Support for Intel's IXP23xx (XScale) family of processors.
471 bool "IXP2400/2800-based"
475 select ARCH_USES_GETTIMEOFFSET
477 Support for Intel's IXP2400/2800 (XScale) family of processors.
485 select GENERIC_CLOCKEVENTS
486 select HAVE_SCHED_CLOCK
487 select MIGHT_HAVE_PCI
488 select DMABOUNCE if PCI
490 Support for Intel's IXP4XX (XScale) family of processors.
496 select ARCH_REQUIRE_GPIOLIB
497 select GENERIC_CLOCKEVENTS
500 Support for the Marvell Dove SoC 88AP510
503 bool "Marvell Kirkwood"
506 select ARCH_REQUIRE_GPIOLIB
507 select GENERIC_CLOCKEVENTS
510 Support for the following Marvell Kirkwood series SoCs:
511 88F6180, 88F6192 and 88F6281.
517 select ARCH_REQUIRE_GPIOLIB
520 select USB_ARCH_HAS_OHCI
523 select GENERIC_CLOCKEVENTS
525 Support for the NXP LPC32XX family of processors
528 bool "Marvell MV78xx0"
531 select ARCH_REQUIRE_GPIOLIB
532 select GENERIC_CLOCKEVENTS
535 Support for the following Marvell MV78xx0 series SoCs:
543 select ARCH_REQUIRE_GPIOLIB
544 select GENERIC_CLOCKEVENTS
547 Support for the following Marvell Orion 5x series SoCs:
548 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
549 Orion-2 (5281), Orion-1-90 (6183).
552 bool "Marvell PXA168/910/MMP2"
554 select ARCH_REQUIRE_GPIOLIB
556 select GENERIC_CLOCKEVENTS
557 select HAVE_SCHED_CLOCK
562 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
565 bool "Micrel/Kendin KS8695"
567 select ARCH_REQUIRE_GPIOLIB
568 select ARCH_USES_GETTIMEOFFSET
570 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
571 System-on-Chip devices.
574 bool "Nuvoton W90X900 CPU"
576 select ARCH_REQUIRE_GPIOLIB
579 select GENERIC_CLOCKEVENTS
581 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
582 At present, the w90x900 has been renamed nuc900, regarding
583 the ARM series product line, you can login the following
584 link address to know more.
586 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
587 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
590 bool "Nuvoton NUC93X CPU"
594 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
595 low-power and high performance MPEG-4/JPEG multimedia controller chip.
602 select GENERIC_CLOCKEVENTS
605 select HAVE_SCHED_CLOCK
606 select ARCH_HAS_CPUFREQ
608 This enables support for NVIDIA Tegra based systems (Tegra APX,
609 Tegra 6xx and Tegra 2 series).
612 bool "Philips Nexperia PNX4008 Mobile"
615 select ARCH_USES_GETTIMEOFFSET
617 This enables support for Philips PNX4008 mobile platform.
620 bool "PXA2xx/PXA3xx-based"
623 select ARCH_HAS_CPUFREQ
626 select ARCH_REQUIRE_GPIOLIB
627 select GENERIC_CLOCKEVENTS
628 select HAVE_SCHED_CLOCK
633 select MULTI_IRQ_HANDLER
635 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
640 select GENERIC_CLOCKEVENTS
641 select ARCH_REQUIRE_GPIOLIB
644 Support for Qualcomm MSM/QSD based systems. This runs on the
645 apps processor of the MSM/QSD and depends on a shared memory
646 interface to the modem processor which runs the baseband
647 stack and controls some vital subsystems
648 (clock and power control, etc).
651 bool "Renesas SH-Mobile / R-Mobile"
654 select HAVE_MACH_CLKDEV
655 select GENERIC_CLOCKEVENTS
658 select MULTI_IRQ_HANDLER
659 select PM_GENERIC_DOMAINS if PM
661 Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
668 select ARCH_MAY_HAVE_PC_FDC
669 select HAVE_PATA_PLATFORM
672 select ARCH_SPARSEMEM_ENABLE
673 select ARCH_USES_GETTIMEOFFSET
675 On the Acorn Risc-PC, Linux can support the internal IDE disk and
676 CD-ROM interface, serial and parallel port, and the floppy drive.
683 select ARCH_SPARSEMEM_ENABLE
685 select ARCH_HAS_CPUFREQ
687 select GENERIC_CLOCKEVENTS
689 select HAVE_SCHED_CLOCK
691 select ARCH_REQUIRE_GPIOLIB
693 Support for StrongARM 11x0 based boards.
696 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
698 select ARCH_HAS_CPUFREQ
701 select ARCH_USES_GETTIMEOFFSET
702 select HAVE_S3C2410_I2C if I2C
704 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
705 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
706 the Samsung SMDK2410 development board (and derivatives).
708 Note, the S3C2416 and the S3C2450 are so close that they even share
709 the same SoC ID code. This means that there is no separate machine
710 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
713 bool "Samsung S3C64XX"
720 select ARCH_USES_GETTIMEOFFSET
721 select ARCH_HAS_CPUFREQ
722 select ARCH_REQUIRE_GPIOLIB
723 select SAMSUNG_CLKSRC
724 select SAMSUNG_IRQ_VIC_TIMER
725 select SAMSUNG_IRQ_UART
726 select S3C_GPIO_TRACK
728 select USB_ARCH_HAS_OHCI
729 select SAMSUNG_GPIOLIB_4BIT
730 select HAVE_S3C2410_I2C if I2C
731 select HAVE_S3C2410_WATCHDOG if WATCHDOG
733 Samsung S3C64XX series based systems
736 bool "Samsung S5P6440 S5P6450"
742 select HAVE_S3C2410_WATCHDOG if WATCHDOG
743 select GENERIC_CLOCKEVENTS
744 select HAVE_SCHED_CLOCK
745 select HAVE_S3C2410_I2C if I2C
746 select HAVE_S3C_RTC if RTC_CLASS
748 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
752 bool "Samsung S5PC100"
757 select ARM_L1_CACHE_SHIFT_6
758 select ARCH_USES_GETTIMEOFFSET
759 select HAVE_S3C2410_I2C if I2C
760 select HAVE_S3C_RTC if RTC_CLASS
761 select HAVE_S3C2410_WATCHDOG if WATCHDOG
763 Samsung S5PC100 series based systems
766 bool "Samsung S5PV210/S5PC110"
768 select ARCH_SPARSEMEM_ENABLE
769 select ARCH_HAS_HOLES_MEMORYMODEL
774 select ARM_L1_CACHE_SHIFT_6
775 select ARCH_HAS_CPUFREQ
776 select GENERIC_CLOCKEVENTS
777 select HAVE_SCHED_CLOCK
778 select HAVE_S3C2410_I2C if I2C
779 select HAVE_S3C_RTC if RTC_CLASS
780 select HAVE_S3C2410_WATCHDOG if WATCHDOG
782 Samsung S5PV210/S5PC110 series based systems
785 bool "Samsung EXYNOS4"
787 select ARCH_SPARSEMEM_ENABLE
788 select ARCH_HAS_HOLES_MEMORYMODEL
792 select ARCH_HAS_CPUFREQ
793 select GENERIC_CLOCKEVENTS
794 select HAVE_S3C_RTC if RTC_CLASS
795 select HAVE_S3C2410_I2C if I2C
796 select HAVE_S3C2410_WATCHDOG if WATCHDOG
798 Samsung EXYNOS4 series based systems
807 select ARCH_USES_GETTIMEOFFSET
809 Support for the StrongARM based Digital DNARD machine, also known
810 as "Shark" (<http://www.shark-linux.de/shark.html>).
813 bool "Telechips TCC ARM926-based systems"
818 select GENERIC_CLOCKEVENTS
820 Support for Telechips TCC ARM926-based systems.
823 bool "ST-Ericsson U300 Series"
827 select HAVE_SCHED_CLOCK
831 select GENERIC_CLOCKEVENTS
833 select HAVE_MACH_CLKDEV
836 Support for ST-Ericsson U300 series mobile platforms.
839 bool "ST-Ericsson U8500 Series"
842 select GENERIC_CLOCKEVENTS
844 select ARCH_REQUIRE_GPIOLIB
845 select ARCH_HAS_CPUFREQ
847 Support for ST-Ericsson's Ux500 architecture
850 bool "STMicroelectronics Nomadik"
855 select GENERIC_CLOCKEVENTS
856 select ARCH_REQUIRE_GPIOLIB
858 Support for the Nomadik platform by ST-Ericsson
862 select GENERIC_CLOCKEVENTS
863 select ARCH_REQUIRE_GPIOLIB
867 select GENERIC_ALLOCATOR
868 select GENERIC_IRQ_CHIP
869 select ARCH_HAS_HOLES_MEMORYMODEL
871 Support for TI's DaVinci platform.
876 select ARCH_REQUIRE_GPIOLIB
877 select ARCH_HAS_CPUFREQ
879 select GENERIC_CLOCKEVENTS
880 select HAVE_SCHED_CLOCK
881 select ARCH_HAS_HOLES_MEMORYMODEL
883 Support for TI's OMAP platform (OMAP1/2/3/4).
888 select ARCH_REQUIRE_GPIOLIB
891 select GENERIC_CLOCKEVENTS
894 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
897 bool "VIA/WonderMedia 85xx"
900 select ARCH_HAS_CPUFREQ
901 select GENERIC_CLOCKEVENTS
902 select ARCH_REQUIRE_GPIOLIB
905 Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
908 bool "Xilinx Zynq ARM Cortex A9 Platform"
911 select GENERIC_CLOCKEVENTS
918 Support for Xilinx Zynq ARM Cortex A9 Platform
922 # This is sorted alphabetically by mach-* pathname. However, plat-*
923 # Kconfigs may be included either alphabetically (according to the
924 # plat- suffix) or along side the corresponding mach-* source.
926 source "arch/arm/mach-at91/Kconfig"
928 source "arch/arm/mach-bcmring/Kconfig"
930 source "arch/arm/mach-clps711x/Kconfig"
932 source "arch/arm/mach-cns3xxx/Kconfig"
934 source "arch/arm/mach-davinci/Kconfig"
936 source "arch/arm/mach-dove/Kconfig"
938 source "arch/arm/mach-ep93xx/Kconfig"
940 source "arch/arm/mach-footbridge/Kconfig"
942 source "arch/arm/mach-gemini/Kconfig"
944 source "arch/arm/mach-h720x/Kconfig"
946 source "arch/arm/mach-integrator/Kconfig"
948 source "arch/arm/mach-iop32x/Kconfig"
950 source "arch/arm/mach-iop33x/Kconfig"
952 source "arch/arm/mach-iop13xx/Kconfig"
954 source "arch/arm/mach-ixp4xx/Kconfig"
956 source "arch/arm/mach-ixp2000/Kconfig"
958 source "arch/arm/mach-ixp23xx/Kconfig"
960 source "arch/arm/mach-kirkwood/Kconfig"
962 source "arch/arm/mach-ks8695/Kconfig"
964 source "arch/arm/mach-lpc32xx/Kconfig"
966 source "arch/arm/mach-msm/Kconfig"
968 source "arch/arm/mach-mv78xx0/Kconfig"
970 source "arch/arm/plat-mxc/Kconfig"
972 source "arch/arm/mach-mxs/Kconfig"
974 source "arch/arm/mach-netx/Kconfig"
976 source "arch/arm/mach-nomadik/Kconfig"
977 source "arch/arm/plat-nomadik/Kconfig"
979 source "arch/arm/mach-nuc93x/Kconfig"
981 source "arch/arm/plat-omap/Kconfig"
983 source "arch/arm/mach-omap1/Kconfig"
985 source "arch/arm/mach-omap2/Kconfig"
987 source "arch/arm/mach-orion5x/Kconfig"
989 source "arch/arm/mach-pxa/Kconfig"
990 source "arch/arm/plat-pxa/Kconfig"
992 source "arch/arm/mach-mmp/Kconfig"
994 source "arch/arm/mach-realview/Kconfig"
996 source "arch/arm/mach-sa1100/Kconfig"
998 source "arch/arm/plat-samsung/Kconfig"
999 source "arch/arm/plat-s3c24xx/Kconfig"
1000 source "arch/arm/plat-s5p/Kconfig"
1002 source "arch/arm/plat-spear/Kconfig"
1004 source "arch/arm/plat-tcc/Kconfig"
1007 source "arch/arm/mach-s3c2410/Kconfig"
1008 source "arch/arm/mach-s3c2412/Kconfig"
1009 source "arch/arm/mach-s3c2416/Kconfig"
1010 source "arch/arm/mach-s3c2440/Kconfig"
1011 source "arch/arm/mach-s3c2443/Kconfig"
1015 source "arch/arm/mach-s3c64xx/Kconfig"
1018 source "arch/arm/mach-s5p64x0/Kconfig"
1020 source "arch/arm/mach-s5pc100/Kconfig"
1022 source "arch/arm/mach-s5pv210/Kconfig"
1024 source "arch/arm/mach-exynos4/Kconfig"
1026 source "arch/arm/mach-shmobile/Kconfig"
1028 source "arch/arm/mach-tegra/Kconfig"
1030 source "arch/arm/mach-u300/Kconfig"
1032 source "arch/arm/mach-ux500/Kconfig"
1034 source "arch/arm/mach-versatile/Kconfig"
1036 source "arch/arm/mach-vexpress/Kconfig"
1037 source "arch/arm/plat-versatile/Kconfig"
1039 source "arch/arm/mach-vt8500/Kconfig"
1041 source "arch/arm/mach-w90x900/Kconfig"
1043 # Definitions to make life easier
1049 select GENERIC_CLOCKEVENTS
1050 select HAVE_SCHED_CLOCK
1055 select GENERIC_IRQ_CHIP
1056 select HAVE_SCHED_CLOCK
1061 config PLAT_VERSATILE
1064 config ARM_TIMER_SP804
1068 source arch/arm/mm/Kconfig
1071 bool "Enable iWMMXt support"
1072 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
1073 default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
1075 Enable support for iWMMXt context switching at run time if
1076 running on a CPU that supports it.
1078 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
1081 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
1085 depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
1086 (!ARCH_OMAP3 || OMAP3_EMU)
1090 config MULTI_IRQ_HANDLER
1093 Allow each machine to specify it's own IRQ handler at run time.
1096 source "arch/arm/Kconfig-nommu"
1099 config ARM_ERRATA_411920
1100 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1101 depends on CPU_V6 || CPU_V6K
1103 Invalidation of the Instruction Cache operation can
1104 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1105 It does not affect the MPCore. This option enables the ARM Ltd.
1106 recommended workaround.
1108 config ARM_ERRATA_430973
1109 bool "ARM errata: Stale prediction on replaced interworking branch"
1112 This option enables the workaround for the 430973 Cortex-A8
1113 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1114 interworking branch is replaced with another code sequence at the
1115 same virtual address, whether due to self-modifying code or virtual
1116 to physical address re-mapping, Cortex-A8 does not recover from the
1117 stale interworking branch prediction. This results in Cortex-A8
1118 executing the new code sequence in the incorrect ARM or Thumb state.
1119 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1120 and also flushes the branch target cache at every context switch.
1121 Note that setting specific bits in the ACTLR register may not be
1122 available in non-secure mode.
1124 config ARM_ERRATA_458693
1125 bool "ARM errata: Processor deadlock when a false hazard is created"
1128 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1129 erratum. For very specific sequences of memory operations, it is
1130 possible for a hazard condition intended for a cache line to instead
1131 be incorrectly associated with a different cache line. This false
1132 hazard might then cause a processor deadlock. The workaround enables
1133 the L1 caching of the NEON accesses and disables the PLD instruction
1134 in the ACTLR register. Note that setting specific bits in the ACTLR
1135 register may not be available in non-secure mode.
1137 config ARM_ERRATA_460075
1138 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1141 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1142 erratum. Any asynchronous access to the L2 cache may encounter a
1143 situation in which recent store transactions to the L2 cache are lost
1144 and overwritten with stale memory contents from external memory. The
1145 workaround disables the write-allocate mode for the L2 cache via the
1146 ACTLR register. Note that setting specific bits in the ACTLR register
1147 may not be available in non-secure mode.
1149 config ARM_ERRATA_742230
1150 bool "ARM errata: DMB operation may be faulty"
1151 depends on CPU_V7 && SMP
1153 This option enables the workaround for the 742230 Cortex-A9
1154 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1155 between two write operations may not ensure the correct visibility
1156 ordering of the two writes. This workaround sets a specific bit in
1157 the diagnostic register of the Cortex-A9 which causes the DMB
1158 instruction to behave as a DSB, ensuring the correct behaviour of
1161 config ARM_ERRATA_742231
1162 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1163 depends on CPU_V7 && SMP
1165 This option enables the workaround for the 742231 Cortex-A9
1166 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1167 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1168 accessing some data located in the same cache line, may get corrupted
1169 data due to bad handling of the address hazard when the line gets
1170 replaced from one of the CPUs at the same time as another CPU is
1171 accessing it. This workaround sets specific bits in the diagnostic
1172 register of the Cortex-A9 which reduces the linefill issuing
1173 capabilities of the processor.
1175 config PL310_ERRATA_588369
1176 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1177 depends on CACHE_L2X0
1179 The PL310 L2 cache controller implements three types of Clean &
1180 Invalidate maintenance operations: by Physical Address
1181 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1182 They are architecturally defined to behave as the execution of a
1183 clean operation followed immediately by an invalidate operation,
1184 both performing to the same memory location. This functionality
1185 is not correctly implemented in PL310 as clean lines are not
1186 invalidated as a result of these operations.
1188 config ARM_ERRATA_720789
1189 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1190 depends on CPU_V7 && SMP
1192 This option enables the workaround for the 720789 Cortex-A9 (prior to
1193 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1194 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1195 As a consequence of this erratum, some TLB entries which should be
1196 invalidated are not, resulting in an incoherency in the system page
1197 tables. The workaround changes the TLB flushing routines to invalidate
1198 entries regardless of the ASID.
1200 config PL310_ERRATA_727915
1201 bool "Background Clean & Invalidate by Way operation can cause data corruption"
1202 depends on CACHE_L2X0
1204 PL310 implements the Clean & Invalidate by Way L2 cache maintenance
1205 operation (offset 0x7FC). This operation runs in background so that
1206 PL310 can handle normal accesses while it is in progress. Under very
1207 rare circumstances, due to this erratum, write data can be lost when
1208 PL310 treats a cacheable write transaction during a Clean &
1209 Invalidate by Way operation.
1211 config ARM_ERRATA_743622
1212 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1215 This option enables the workaround for the 743622 Cortex-A9
1216 (r2p0..r2p2) erratum. Under very rare conditions, a faulty
1217 optimisation in the Cortex-A9 Store Buffer may lead to data
1218 corruption. This workaround sets a specific bit in the diagnostic
1219 register of the Cortex-A9 which disables the Store Buffer
1220 optimisation, preventing the defect from occurring. This has no
1221 visible impact on the overall performance or power consumption of the
1224 config ARM_ERRATA_751472
1225 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1226 depends on CPU_V7 && SMP
1228 This option enables the workaround for the 751472 Cortex-A9 (prior
1229 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1230 completion of a following broadcasted operation if the second
1231 operation is received by a CPU before the ICIALLUIS has completed,
1232 potentially leading to corrupted entries in the cache or TLB.
1234 config ARM_ERRATA_753970
1235 bool "ARM errata: cache sync operation may be faulty"
1236 depends on CACHE_PL310
1238 This option enables the workaround for the 753970 PL310 (r3p0) erratum.
1240 Under some condition the effect of cache sync operation on
1241 the store buffer still remains when the operation completes.
1242 This means that the store buffer is always asked to drain and
1243 this prevents it from merging any further writes. The workaround
1244 is to replace the normal offset of cache sync operation (0x730)
1245 by another offset targeting an unmapped PL310 register 0x740.
1246 This has the same effect as the cache sync operation: store buffer
1247 drain and waiting for all buffers empty.
1249 config ARM_ERRATA_754322
1250 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1253 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1254 r3p*) erratum. A speculative memory access may cause a page table walk
1255 which starts prior to an ASID switch but completes afterwards. This
1256 can populate the micro-TLB with a stale entry which may be hit with
1257 the new ASID. This workaround places two dsb instructions in the mm
1258 switching code so that no page table walks can cross the ASID switch.
1260 config ARM_ERRATA_754327
1261 bool "ARM errata: no automatic Store Buffer drain"
1262 depends on CPU_V7 && SMP
1264 This option enables the workaround for the 754327 Cortex-A9 (prior to
1265 r2p0) erratum. The Store Buffer does not have any automatic draining
1266 mechanism and therefore a livelock may occur if an external agent
1267 continuously polls a memory location waiting to observe an update.
1268 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1269 written polling loops from denying visibility of updates to memory.
1271 config ARM_ERRATA_364296
1272 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1273 depends on CPU_V6 && !SMP
1275 This options enables the workaround for the 364296 ARM1136
1276 r0p2 erratum (possible cache data corruption with
1277 hit-under-miss enabled). It sets the undocumented bit 31 in
1278 the auxiliary control register and the FI bit in the control
1279 register, thus disabling hit-under-miss without putting the
1280 processor into full low interrupt latency mode. ARM11MPCore
1285 source "arch/arm/common/Kconfig"
1295 Find out whether you have ISA slots on your motherboard. ISA is the
1296 name of a bus system, i.e. the way the CPU talks to the other stuff
1297 inside your box. Other bus systems are PCI, EISA, MicroChannel
1298 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1299 newer boards don't support it. If you have ISA, say Y, otherwise N.
1301 # Select ISA DMA controller support
1306 # Select ISA DMA interface
1311 bool "PCI support" if MIGHT_HAVE_PCI
1313 Find out whether you have a PCI motherboard. PCI is the name of a
1314 bus system, i.e. the way the CPU talks to the other stuff inside
1315 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1316 VESA. If you have PCI, say Y, otherwise N.
1322 config PCI_NANOENGINE
1323 bool "BSE nanoEngine PCI support"
1324 depends on SA1100_NANOENGINE
1326 Enable PCI on the BSE nanoEngine board.
1331 # Select the host bridge type
1332 config PCI_HOST_VIA82C505
1334 depends on PCI && ARCH_SHARK
1337 config PCI_HOST_ITE8152
1339 depends on PCI && MACH_ARMCORE
1343 source "drivers/pci/Kconfig"
1345 source "drivers/pcmcia/Kconfig"
1349 menu "Kernel Features"
1351 source "kernel/time/Kconfig"
1354 bool "Symmetric Multi-Processing"
1355 depends on CPU_V6K || CPU_V7
1356 depends on GENERIC_CLOCKEVENTS
1357 depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
1358 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1359 ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
1360 ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE
1361 select USE_GENERIC_SMP_HELPERS
1362 select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
1364 This enables support for systems with more than one CPU. If you have
1365 a system with only one CPU, like most personal computers, say N. If
1366 you have a system with more than one CPU, say Y.
1368 If you say N here, the kernel will run on single and multiprocessor
1369 machines, but will use only one CPU of a multiprocessor machine. If
1370 you say Y here, the kernel will run on many, but not all, single
1371 processor machines. On a single processor machine, the kernel will
1372 run faster if you say N here.
1374 See also <file:Documentation/i386/IO-APIC.txt>,
1375 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1376 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1378 If you don't know what to do here, say N.
1381 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
1382 depends on EXPERIMENTAL
1383 depends on SMP && !XIP_KERNEL
1386 SMP kernels contain instructions which fail on non-SMP processors.
1387 Enabling this option allows the kernel to modify itself to make
1388 these instructions safe. Disabling it allows about 1K of space
1391 If you don't know what to do here, say Y.
1396 This option enables support for the ARM system coherency unit
1403 This options enables support for the ARM timer and watchdog unit
1406 prompt "Memory split"
1409 Select the desired split between kernel and user memory.
1411 If you are not absolutely sure what you are doing, leave this
1415 bool "3G/1G user/kernel split"
1417 bool "2G/2G user/kernel split"
1419 bool "1G/3G user/kernel split"
1424 default 0x40000000 if VMSPLIT_1G
1425 default 0x80000000 if VMSPLIT_2G
1429 int "Maximum number of CPUs (2-32)"
1435 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1436 depends on SMP && HOTPLUG && EXPERIMENTAL
1438 Say Y here to experiment with turning CPUs off and on. CPUs
1439 can be controlled through /sys/devices/system/cpu.
1442 bool "Use local timer interrupts"
1445 select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
1447 Enable support for local timers on SMP platforms, rather then the
1448 legacy IPI broadcast method. Local timers allows the system
1449 accounting to be spread across the timer interval, preventing a
1450 "thundering herd" at every timer tick.
1452 source kernel/Kconfig.preempt
1456 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
1457 ARCH_S5PV210 || ARCH_EXYNOS4
1458 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1459 default AT91_TIMER_HZ if ARCH_AT91
1460 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1463 config THUMB2_KERNEL
1464 bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
1465 depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
1467 select ARM_ASM_UNIFIED
1469 By enabling this option, the kernel will be compiled in
1470 Thumb-2 mode. A compiler/assembler that understand the unified
1471 ARM-Thumb syntax is needed.
1475 config THUMB2_AVOID_R_ARM_THM_JUMP11
1476 bool "Work around buggy Thumb-2 short branch relocations in gas"
1477 depends on THUMB2_KERNEL && MODULES
1480 Various binutils versions can resolve Thumb-2 branches to
1481 locally-defined, preemptible global symbols as short-range "b.n"
1482 branch instructions.
1484 This is a problem, because there's no guarantee the final
1485 destination of the symbol, or any candidate locations for a
1486 trampoline, are within range of the branch. For this reason, the
1487 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1488 relocation in modules at all, and it makes little sense to add
1491 The symptom is that the kernel fails with an "unsupported
1492 relocation" error when loading some modules.
1494 Until fixed tools are available, passing
1495 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1496 code which hits this problem, at the cost of a bit of extra runtime
1497 stack usage in some cases.
1499 The problem is described in more detail at:
1500 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1502 Only Thumb-2 kernels are affected.
1504 Unless you are sure your tools don't have this problem, say Y.
1506 config ARM_ASM_UNIFIED
1510 bool "Use the ARM EABI to compile the kernel"
1512 This option allows for the kernel to be compiled using the latest
1513 ARM ABI (aka EABI). This is only useful if you are using a user
1514 space environment that is also compiled with EABI.
1516 Since there are major incompatibilities between the legacy ABI and
1517 EABI, especially with regard to structure member alignment, this
1518 option also changes the kernel syscall calling convention to
1519 disambiguate both ABIs and allow for backward compatibility support
1520 (selected with CONFIG_OABI_COMPAT).
1522 To use this you need GCC version 4.0.0 or later.
1525 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1526 depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
1529 This option preserves the old syscall interface along with the
1530 new (ARM EABI) one. It also provides a compatibility layer to
1531 intercept syscalls that have structure arguments which layout
1532 in memory differs between the legacy ABI and the new ARM EABI
1533 (only for non "thumb" binaries). This option adds a tiny
1534 overhead to all syscalls and produces a slightly larger kernel.
1535 If you know you'll be using only pure EABI user space then you
1536 can say N here. If this option is not selected and you attempt
1537 to execute a legacy ABI binary then the result will be
1538 UNPREDICTABLE (in fact it can be predicted that it won't work
1539 at all). If in doubt say Y.
1541 config ARCH_HAS_HOLES_MEMORYMODEL
1544 config ARCH_SPARSEMEM_ENABLE
1547 config ARCH_SPARSEMEM_DEFAULT
1548 def_bool ARCH_SPARSEMEM_ENABLE
1550 config ARCH_SELECT_MEMORY_MODEL
1551 def_bool ARCH_SPARSEMEM_ENABLE
1553 config HAVE_ARCH_PFN_VALID
1554 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1557 bool "High Memory Support"
1560 The address space of ARM processors is only 4 Gigabytes large
1561 and it has to accommodate user address space, kernel address
1562 space as well as some memory mapped IO. That means that, if you
1563 have a large amount of physical memory and/or IO, not all of the
1564 memory can be "permanently mapped" by the kernel. The physical
1565 memory that is not permanently mapped is called "high memory".
1567 Depending on the selected kernel/user memory split, minimum
1568 vmalloc space and actual amount of RAM, you may not need this
1569 option which should result in a slightly faster kernel.
1574 bool "Allocate 2nd-level pagetables from highmem"
1577 config HW_PERF_EVENTS
1578 bool "Enable hardware performance counter support for perf events"
1579 depends on PERF_EVENTS && CPU_HAS_PMU
1582 Enable hardware performance counter support for perf events. If
1583 disabled, perf events will use software events only.
1587 config FORCE_MAX_ZONEORDER
1588 int "Maximum zone order" if ARCH_SHMOBILE
1589 range 11 64 if ARCH_SHMOBILE
1590 default "9" if SA1111
1593 The kernel memory allocator divides physically contiguous memory
1594 blocks into "zones", where each zone is a power of two number of
1595 pages. This option selects the largest power of two that the kernel
1596 keeps in the memory allocator. If you need to allocate very large
1597 blocks of physically contiguous memory, then you may need to
1598 increase this value.
1600 This config option is actually maximum order plus one. For example,
1601 a value of 11 means that the largest free memory block is 2^10 pages.
1604 bool "Timer and CPU usage LEDs"
1605 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1606 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1607 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1608 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1609 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1610 ARCH_AT91 || ARCH_DAVINCI || \
1611 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1613 If you say Y here, the LEDs on your machine will be used
1614 to provide useful information about your current system status.
1616 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1617 be able to select which LEDs are active using the options below. If
1618 you are compiling a kernel for the EBSA-110 or the LART however, the
1619 red LED will simply flash regularly to indicate that the system is
1620 still functional. It is safe to say Y here if you have a CATS
1621 system, but the driver will do nothing.
1624 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1625 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1626 || MACH_OMAP_PERSEUS2
1628 depends on !GENERIC_CLOCKEVENTS
1629 default y if ARCH_EBSA110
1631 If you say Y here, one of the system LEDs (the green one on the
1632 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1633 will flash regularly to indicate that the system is still
1634 operational. This is mainly useful to kernel hackers who are
1635 debugging unstable kernels.
1637 The LART uses the same LED for both Timer LED and CPU usage LED
1638 functions. You may choose to use both, but the Timer LED function
1639 will overrule the CPU usage LED.
1642 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1644 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1645 || MACH_OMAP_PERSEUS2
1648 If you say Y here, the red LED will be used to give a good real
1649 time indication of CPU usage, by lighting whenever the idle task
1650 is not currently executing.
1652 The LART uses the same LED for both Timer LED and CPU usage LED
1653 functions. You may choose to use both, but the Timer LED function
1654 will overrule the CPU usage LED.
1656 config ALIGNMENT_TRAP
1658 depends on CPU_CP15_MMU
1659 default y if !ARCH_EBSA110
1660 select HAVE_PROC_CPU if PROC_FS
1662 ARM processors cannot fetch/store information which is not
1663 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1664 address divisible by 4. On 32-bit ARM processors, these non-aligned
1665 fetch/store instructions will be emulated in software if you say
1666 here, which has a severe performance impact. This is necessary for
1667 correct operation of some network protocols. With an IP-only
1668 configuration it is safe to say N, otherwise say Y.
1670 config UACCESS_WITH_MEMCPY
1671 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1672 depends on MMU && EXPERIMENTAL
1673 default y if CPU_FEROCEON
1675 Implement faster copy_to_user and clear_user methods for CPU
1676 cores where a 8-word STM instruction give significantly higher
1677 memory write throughput than a sequence of individual 32bit stores.
1679 A possible side effect is a slight increase in scheduling latency
1680 between threads sharing the same address space if they invoke
1681 such copy operations with large buffers.
1683 However, if the CPU data cache is using a write-allocate mode,
1684 this option is unlikely to provide any performance gain.
1688 prompt "Enable seccomp to safely compute untrusted bytecode"
1690 This kernel feature is useful for number crunching applications
1691 that may need to compute untrusted bytecode during their
1692 execution. By using pipes or other transports made available to
1693 the process as file descriptors supporting the read/write
1694 syscalls, it's possible to isolate those applications in
1695 their own address space using seccomp. Once seccomp is
1696 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1697 and the task is only allowed to execute a few safe syscalls
1698 defined by each seccomp mode.
1700 config CC_STACKPROTECTOR
1701 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1702 depends on EXPERIMENTAL
1704 This option turns on the -fstack-protector GCC feature. This
1705 feature puts, at the beginning of functions, a canary value on
1706 the stack just before the return address, and validates
1707 the value just before actually returning. Stack based buffer
1708 overflows (that need to overwrite this return address) now also
1709 overwrite the canary, which gets detected and the attack is then
1710 neutralized via a kernel panic.
1711 This feature requires gcc version 4.2 or above.
1713 config DEPRECATED_PARAM_STRUCT
1714 bool "Provide old way to pass kernel parameters"
1716 This was deprecated in 2001 and announced to live on for 5 years.
1717 Some old boot loaders still use this way.
1724 bool "Flattened Device Tree support"
1726 select OF_EARLY_FLATTREE
1729 Include support for flattened device tree machine descriptions.
1731 # Compressed boot loader in ROM. Yes, we really want to ask about
1732 # TEXT and BSS so we preserve their values in the config files.
1733 config ZBOOT_ROM_TEXT
1734 hex "Compressed ROM boot loader base address"
1737 The physical address at which the ROM-able zImage is to be
1738 placed in the target. Platforms which normally make use of
1739 ROM-able zImage formats normally set this to a suitable
1740 value in their defconfig file.
1742 If ZBOOT_ROM is not enabled, this has no effect.
1744 config ZBOOT_ROM_BSS
1745 hex "Compressed ROM boot loader BSS address"
1748 The base address of an area of read/write memory in the target
1749 for the ROM-able zImage which must be available while the
1750 decompressor is running. It must be large enough to hold the
1751 entire decompressed kernel plus an additional 128 KiB.
1752 Platforms which normally make use of ROM-able zImage formats
1753 normally set this to a suitable value in their defconfig file.
1755 If ZBOOT_ROM is not enabled, this has no effect.
1758 bool "Compressed boot loader in ROM/flash"
1759 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1761 Say Y here if you intend to execute your compressed kernel image
1762 (zImage) directly from ROM or flash. If unsure, say N.
1765 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
1766 depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
1767 default ZBOOT_ROM_NONE
1769 Include experimental SD/MMC loading code in the ROM-able zImage.
1770 With this enabled it is possible to write the the ROM-able zImage
1771 kernel image to an MMC or SD card and boot the kernel straight
1772 from the reset vector. At reset the processor Mask ROM will load
1773 the first part of the the ROM-able zImage which in turn loads the
1774 rest the kernel image to RAM.
1776 config ZBOOT_ROM_NONE
1777 bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
1779 Do not load image from SD or MMC
1781 config ZBOOT_ROM_MMCIF
1782 bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
1784 Load image from MMCIF hardware block.
1786 config ZBOOT_ROM_SH_MOBILE_SDHI
1787 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
1789 Load image from SDHI hardware block
1794 string "Default kernel command string"
1797 On some architectures (EBSA110 and CATS), there is currently no way
1798 for the boot loader to pass arguments to the kernel. For these
1799 architectures, you should supply some command-line options at build
1800 time by entering them here. As a minimum, you should specify the
1801 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1804 prompt "Kernel command line type" if CMDLINE != ""
1805 default CMDLINE_FROM_BOOTLOADER
1807 config CMDLINE_FROM_BOOTLOADER
1808 bool "Use bootloader kernel arguments if available"
1810 Uses the command-line options passed by the boot loader. If
1811 the boot loader doesn't provide any, the default kernel command
1812 string provided in CMDLINE will be used.
1814 config CMDLINE_EXTEND
1815 bool "Extend bootloader kernel arguments"
1817 The command-line arguments provided by the boot loader will be
1818 appended to the default kernel command string.
1820 config CMDLINE_FORCE
1821 bool "Always use the default kernel command string"
1823 Always use the default kernel command string, even if the boot
1824 loader passes other arguments to the kernel.
1825 This is useful if you cannot or don't want to change the
1826 command-line options your boot loader passes to the kernel.
1830 bool "Kernel Execute-In-Place from ROM"
1831 depends on !ZBOOT_ROM
1833 Execute-In-Place allows the kernel to run from non-volatile storage
1834 directly addressable by the CPU, such as NOR flash. This saves RAM
1835 space since the text section of the kernel is not loaded from flash
1836 to RAM. Read-write sections, such as the data section and stack,
1837 are still copied to RAM. The XIP kernel is not compressed since
1838 it has to run directly from flash, so it will take more space to
1839 store it. The flash address used to link the kernel object files,
1840 and for storing it, is configuration dependent. Therefore, if you
1841 say Y here, you must know the proper physical address where to
1842 store the kernel image depending on your own flash memory usage.
1844 Also note that the make target becomes "make xipImage" rather than
1845 "make zImage" or "make Image". The final kernel binary to put in
1846 ROM memory will be arch/arm/boot/xipImage.
1850 config XIP_PHYS_ADDR
1851 hex "XIP Kernel Physical Location"
1852 depends on XIP_KERNEL
1853 default "0x00080000"
1855 This is the physical address in your flash memory the kernel will
1856 be linked for and stored to. This address is dependent on your
1860 bool "Kexec system call (EXPERIMENTAL)"
1861 depends on EXPERIMENTAL
1863 kexec is a system call that implements the ability to shutdown your
1864 current kernel, and to start another kernel. It is like a reboot
1865 but it is independent of the system firmware. And like a reboot
1866 you can start any kernel with it, not just Linux.
1868 It is an ongoing process to be certain the hardware in a machine
1869 is properly shutdown, so do not be surprised if this code does not
1870 initially work for you. It may help to enable device hotplugging
1874 bool "Export atags in procfs"
1878 Should the atags used to boot the kernel be exported in an "atags"
1879 file in procfs. Useful with kexec.
1882 bool "Build kdump crash kernel (EXPERIMENTAL)"
1883 depends on EXPERIMENTAL
1885 Generate crash dump after being started by kexec. This should
1886 be normally only set in special crash dump kernels which are
1887 loaded in the main kernel with kexec-tools into a specially
1888 reserved region and then later executed after a crash by
1889 kdump/kexec. The crash dump kernel must be compiled to a
1890 memory address not used by the main kernel
1892 For more details see Documentation/kdump/kdump.txt
1894 config AUTO_ZRELADDR
1895 bool "Auto calculation of the decompressed kernel image address"
1896 depends on !ZBOOT_ROM && !ARCH_U300
1898 ZRELADDR is the physical address where the decompressed kernel
1899 image will be placed. If AUTO_ZRELADDR is selected, the address
1900 will be determined at run-time by masking the current IP with
1901 0xf8000000. This assumes the zImage being placed in the first 128MB
1902 from start of memory.
1906 menu "CPU Power Management"
1910 source "drivers/cpufreq/Kconfig"
1913 tristate "CPUfreq driver for i.MX CPUs"
1914 depends on ARCH_MXC && CPU_FREQ
1916 This enables the CPUfreq driver for i.MX CPUs.
1918 config CPU_FREQ_SA1100
1921 config CPU_FREQ_SA1110
1924 config CPU_FREQ_INTEGRATOR
1925 tristate "CPUfreq driver for ARM Integrator CPUs"
1926 depends on ARCH_INTEGRATOR && CPU_FREQ
1929 This enables the CPUfreq driver for ARM Integrator CPUs.
1931 For details, take a look at <file:Documentation/cpu-freq>.
1937 depends on CPU_FREQ && ARCH_PXA && PXA25x
1939 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1944 Internal configuration node for common cpufreq on Samsung SoC
1946 config CPU_FREQ_S3C24XX
1947 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
1948 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1951 This enables the CPUfreq driver for the Samsung S3C24XX family
1954 For details, take a look at <file:Documentation/cpu-freq>.
1958 config CPU_FREQ_S3C24XX_PLL
1959 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
1960 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1962 Compile in support for changing the PLL frequency from the
1963 S3C24XX series CPUfreq driver. The PLL takes time to settle
1964 after a frequency change, so by default it is not enabled.
1966 This also means that the PLL tables for the selected CPU(s) will
1967 be built which may increase the size of the kernel image.
1969 config CPU_FREQ_S3C24XX_DEBUG
1970 bool "Debug CPUfreq Samsung driver core"
1971 depends on CPU_FREQ_S3C24XX
1973 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1975 config CPU_FREQ_S3C24XX_IODEBUG
1976 bool "Debug CPUfreq Samsung driver IO timing"
1977 depends on CPU_FREQ_S3C24XX
1979 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1981 config CPU_FREQ_S3C24XX_DEBUGFS
1982 bool "Export debugfs for CPUFreq"
1983 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1985 Export status information via debugfs.
1989 source "drivers/cpuidle/Kconfig"
1993 menu "Floating point emulation"
1995 comment "At least one emulation must be selected"
1998 bool "NWFPE math emulation"
1999 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
2001 Say Y to include the NWFPE floating point emulator in the kernel.
2002 This is necessary to run most binaries. Linux does not currently
2003 support floating point hardware so you need to say Y here even if
2004 your machine has an FPA or floating point co-processor podule.
2006 You may say N here if you are going to load the Acorn FPEmulator
2007 early in the bootup.
2010 bool "Support extended precision"
2011 depends on FPE_NWFPE
2013 Say Y to include 80-bit support in the kernel floating-point
2014 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2015 Note that gcc does not generate 80-bit operations by default,
2016 so in most cases this option only enlarges the size of the
2017 floating point emulator without any good reason.
2019 You almost surely want to say N here.
2022 bool "FastFPE math emulation (EXPERIMENTAL)"
2023 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
2025 Say Y here to include the FAST floating point emulator in the kernel.
2026 This is an experimental much faster emulator which now also has full
2027 precision for the mantissa. It does not support any exceptions.
2028 It is very simple, and approximately 3-6 times faster than NWFPE.
2030 It should be sufficient for most programs. It may be not suitable
2031 for scientific calculations, but you have to check this for yourself.
2032 If you do not feel you need a faster FP emulation you should better
2036 bool "VFP-format floating point maths"
2037 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
2039 Say Y to include VFP support code in the kernel. This is needed
2040 if your hardware includes a VFP unit.
2042 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2043 release notes and additional status information.
2045 Say N if your target does not have VFP hardware.
2053 bool "Advanced SIMD (NEON) Extension support"
2054 depends on VFPv3 && CPU_V7
2056 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2061 menu "Userspace binary formats"
2063 source "fs/Kconfig.binfmt"
2066 tristate "RISC OS personality"
2069 Say Y here to include the kernel code necessary if you want to run
2070 Acorn RISC OS/Arthur binaries under Linux. This code is still very
2071 experimental; if this sounds frightening, say N and sleep in peace.
2072 You can also say M here to compile this support as a module (which
2073 will be called arthur).
2077 menu "Power management options"
2079 source "kernel/power/Kconfig"
2081 config ARCH_SUSPEND_POSSIBLE
2082 depends on !ARCH_S5P64X0 && !ARCH_S5PC100
2083 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
2084 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
2089 source "net/Kconfig"
2091 source "drivers/Kconfig"
2095 source "arch/arm/Kconfig.debug"
2097 source "security/Kconfig"
2099 source "crypto/Kconfig"
2101 source "lib/Kconfig"