2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
14 select SYS_SUPPORTS_APM_EMULATION
17 select HAVE_KPROBES if (!XIP_KERNEL)
18 select HAVE_KRETPROBES if (HAVE_KPROBES)
19 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
20 select HAVE_GENERIC_DMA_COHERENT
22 The ARM series is a line of low-power-consumption RISC chip designs
23 licensed by ARM Ltd and targeted at embedded applications and
24 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
25 manufactured, but legacy ARM-based PC hardware remains popular in
26 Europe. There is an ARM Linux project with a web page at
27 <http://www.arm.linux.org.uk/>.
32 config SYS_SUPPORTS_APM_EMULATION
41 config GENERIC_CLOCKEVENTS
44 config GENERIC_CLOCKEVENTS_BROADCAST
46 depends on GENERIC_CLOCKEVENTS
47 default y if SMP && !LOCAL_TIMERS
59 The Extended Industry Standard Architecture (EISA) bus was
60 developed as an open alternative to the IBM MicroChannel bus.
62 The EISA bus provided some of the features of the IBM MicroChannel
63 bus while maintaining backward compatibility with cards made for
64 the older ISA bus. The EISA bus saw limited use between 1988 and
65 1995 when it was made obsolete by the PCI bus.
67 Say Y here if you are building a kernel for an EISA-based machine.
77 MicroChannel Architecture is found in some IBM PS/2 machines and
78 laptops. It is a bus system similar to PCI or ISA. See
79 <file:Documentation/mca.txt> (and especially the web page given
80 there) before attempting to build an MCA bus kernel.
82 config GENERIC_HARDIRQS
86 config STACKTRACE_SUPPORT
90 config HAVE_LATENCYTOP_SUPPORT
95 config LOCKDEP_SUPPORT
99 config TRACE_IRQFLAGS_SUPPORT
103 config HARDIRQS_SW_RESEND
107 config GENERIC_IRQ_PROBE
111 config GENERIC_LOCKBREAK
114 depends on SMP && PREEMPT
116 config RWSEM_GENERIC_SPINLOCK
120 config RWSEM_XCHGADD_ALGORITHM
123 config ARCH_HAS_ILOG2_U32
126 config ARCH_HAS_ILOG2_U64
129 config GENERIC_HWEIGHT
133 config GENERIC_CALIBRATE_DELAY
137 config ARCH_MAY_HAVE_PC_FDC
143 config GENERIC_ISA_DMA
152 config GENERIC_HARDIRQS_NO__DO_IRQ
157 config OPROFILE_ARMV6
159 depends on CPU_V6 && !SMP
160 select OPROFILE_ARM11_CORE
162 config OPROFILE_MPCORE
164 depends on CPU_V6 && SMP
165 select OPROFILE_ARM11_CORE
167 config OPROFILE_ARM11_CORE
170 config OPROFILE_ARMV7
172 depends on CPU_V7 && !SMP
179 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
180 default DRAM_BASE if REMAP_VECTORS_TO_RAM
183 The base address of exception vectors.
185 source "init/Kconfig"
187 source "kernel/Kconfig.freezer"
192 prompt "ARM system type"
193 default ARCH_VERSATILE
196 bool "Agilent AAEC-2000 based"
201 This enables support for systems based on the Agilent AAEC-2000
203 config ARCH_INTEGRATOR
204 bool "ARM Ltd. Integrator family"
210 Support for ARM's Integrator platform.
213 bool "ARM Ltd. RealView family"
219 select GENERIC_CLOCKEVENTS
221 This enables support for ARM Ltd RealView boards.
223 config ARCH_VERSATILE
224 bool "ARM Ltd. Versatile family"
231 select GENERIC_CLOCKEVENTS
233 This enables support for ARM Ltd Versatile board.
238 select ARCH_REQUIRE_GPIOLIB
241 This enables support for systems based on the Atmel AT91RM9200,
242 AT91SAM9 and AT91CAP9 processors.
245 bool "Cirrus Logic CLPS711x/EP721x-based"
248 Support for Cirrus Logic 711x/721x based boards.
251 bool "Cortina Systems Gemini"
254 select ARCH_REQUIRE_GPIOLIB
256 Support for the Cortina Systems Gemini family SoCs
264 This is an evaluation board for the StrongARM processor available
265 from Digital. It has limited hardware on-board, including an
266 Ethernet interface, two PCMCIA sockets, two serial ports and a
277 select ARCH_REQUIRE_GPIOLIB
278 select ARCH_HAS_HOLES_MEMORYMODEL
280 This enables support for the Cirrus EP93xx series of CPUs.
282 config ARCH_FOOTBRIDGE
287 Support for systems based on the DC21285 companion chip
288 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
291 bool "Freescale MXC/iMX-based"
293 select GENERIC_CLOCKEVENTS
296 select ARCH_REQUIRE_GPIOLIB
299 Support for Freescale MXC/iMX-based family of processors
302 bool "Freescale STMP3xxx"
306 select ARCH_REQUIRE_GPIOLIB
308 select GENERIC_CLOCKEVENTS
310 select USB_ARCH_HAS_EHCI
312 Support for systems based on the Freescale 3xxx CPUs.
315 bool "Hilscher NetX based"
318 select GENERIC_CLOCKEVENTS
321 This enables support for systems based on the Hilscher NetX Soc
324 bool "Hynix HMS720x-based"
328 This enables support for systems based on the Hynix HMS720x
336 select ARCH_SUPPORTS_MSI
339 Support for Intel's IOP13XX (XScale) family of processors.
348 select ARCH_REQUIRE_GPIOLIB
350 Support for Intel's 80219 and IOP32X (XScale) family of
360 select ARCH_REQUIRE_GPIOLIB
362 Support for Intel's IOP33X (XScale) family of processors.
370 Support for Intel's IXP23xx (XScale) family of processors.
373 bool "IXP2400/2800-based"
378 Support for Intel's IXP2400/2800 (XScale) family of processors.
386 select GENERIC_CLOCKEVENTS
387 select DMABOUNCE if PCI
389 Support for Intel's IXP4XX (XScale) family of processors.
396 Say Y here if you intend to run this kernel on a LinkUp Systems
397 L7200 Software Development Board which uses an ARM720T processor.
398 Information on this board can be obtained at:
400 <http://www.linkupsys.com/>
402 If you have any questions or comments about the Linux kernel port
403 to this board, send e-mail to <sjhill@cotw.com>.
406 bool "Marvell Kirkwood"
410 select ARCH_REQUIRE_GPIOLIB
412 select GENERIC_CLOCKEVENTS
415 Support for the following Marvell Kirkwood series SoCs:
416 88F6180, 88F6192 and 88F6281.
419 bool "Marvell Loki (88RC8480)"
422 select GENERIC_CLOCKEVENTS
425 Support for the Marvell Loki (88RC8480) SoC.
428 bool "Marvell MV78xx0"
432 select ARCH_REQUIRE_GPIOLIB
434 select GENERIC_CLOCKEVENTS
437 Support for the following Marvell MV78xx0 series SoCs:
446 select ARCH_REQUIRE_GPIOLIB
448 select GENERIC_CLOCKEVENTS
451 Support for the following Marvell Orion 5x series SoCs:
452 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
453 Orion-2 (5281), Orion-1-90 (6183).
456 bool "Marvell PXA168/910"
459 select ARCH_REQUIRE_GPIOLIB
463 select GENERIC_CLOCKEVENTS
467 Support for Marvell's PXA168/910 processor line.
470 bool "Micrel/Kendin KS8695"
473 select ARCH_REQUIRE_GPIOLIB
475 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
476 System-on-Chip devices.
479 bool "NetSilicon NS9xxx"
483 select GENERIC_CLOCKEVENTS
486 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
489 <http://www.digi.com/products/microprocessors/index.jsp>
492 bool "Nuvoton W90X900 CPU"
494 select ARCH_REQUIRE_GPIOLIB
499 select GENERIC_CLOCKEVENTS
501 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
502 At present, the w90x900 has been renamed nuc900, regarding
503 the ARM series product line, you can login the following
504 link address to know more.
506 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
507 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
510 bool "Philips Nexperia PNX4008 Mobile"
514 This enables support for Philips PNX4008 mobile platform.
517 bool "PXA2xx/PXA3xx-based"
523 select ARCH_REQUIRE_GPIOLIB
525 select GENERIC_CLOCKEVENTS
529 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
535 select GENERIC_CLOCKEVENTS
537 Support for Qualcomm MSM7K based systems. This runs on the ARM11
538 apps processor of the MSM7K and depends on a shared memory
539 interface to the ARM9 modem processor which runs the baseband stack
540 and controls some vital subsystems (clock and power control, etc).
547 select ARCH_MAY_HAVE_PC_FDC
548 select HAVE_PATA_PLATFORM
551 select ARCH_SPARSEMEM_ENABLE
553 On the Acorn Risc-PC, Linux can support the internal IDE disk and
554 CD-ROM interface, serial and parallel port, and the floppy drive.
560 select ARCH_SPARSEMEM_ENABLE
564 select GENERIC_CLOCKEVENTS
567 select ARCH_REQUIRE_GPIOLIB
569 Support for StrongARM 11x0 based boards.
572 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
576 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
577 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
578 the Samsung SMDK2410 development board (and derivatives).
581 bool "Samsung S3C64XX"
585 Samsung S3C64XX series based systems
595 Support for the StrongARM based Digital DNARD machine, also known
596 as "Shark" (<http://www.shark-linux.de/shark.html>).
601 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
602 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
604 Say Y here for systems based on one of the Sharp LH7A40X
605 System on a Chip processors. These CPUs include an ARM922T
606 core with a wide array of integrated devices for
607 hand-held and low-power applications.
610 bool "ST-Ericsson U300 Series"
616 select GENERIC_CLOCKEVENTS
621 Support for ST-Ericsson U300 series mobile platforms.
627 select GENERIC_CLOCKEVENTS
629 select ARCH_REQUIRE_GPIOLIB
634 select GENERIC_ALLOCATOR
636 Support for TI's DaVinci platform.
642 select ARCH_REQUIRE_GPIOLIB
644 select GENERIC_CLOCKEVENTS
646 Support for TI's OMAP platform (OMAP1 and OMAP2).
650 source "arch/arm/mach-clps711x/Kconfig"
652 source "arch/arm/mach-ep93xx/Kconfig"
654 source "arch/arm/mach-footbridge/Kconfig"
656 source "arch/arm/mach-gemini/Kconfig"
658 source "arch/arm/mach-integrator/Kconfig"
660 source "arch/arm/mach-iop32x/Kconfig"
662 source "arch/arm/mach-iop33x/Kconfig"
664 source "arch/arm/mach-iop13xx/Kconfig"
666 source "arch/arm/mach-ixp4xx/Kconfig"
668 source "arch/arm/mach-ixp2000/Kconfig"
670 source "arch/arm/mach-ixp23xx/Kconfig"
672 source "arch/arm/mach-loki/Kconfig"
674 source "arch/arm/mach-mv78xx0/Kconfig"
676 source "arch/arm/mach-pxa/Kconfig"
677 source "arch/arm/plat-pxa/Kconfig"
679 source "arch/arm/mach-mmp/Kconfig"
681 source "arch/arm/mach-sa1100/Kconfig"
683 source "arch/arm/plat-omap/Kconfig"
685 source "arch/arm/mach-omap1/Kconfig"
687 source "arch/arm/mach-omap2/Kconfig"
689 source "arch/arm/mach-orion5x/Kconfig"
691 source "arch/arm/mach-kirkwood/Kconfig"
693 source "arch/arm/plat-s3c24xx/Kconfig"
694 source "arch/arm/plat-s3c64xx/Kconfig"
695 source "arch/arm/plat-s3c/Kconfig"
698 source "arch/arm/mach-s3c2400/Kconfig"
699 source "arch/arm/mach-s3c2410/Kconfig"
700 source "arch/arm/mach-s3c2412/Kconfig"
701 source "arch/arm/mach-s3c2440/Kconfig"
702 source "arch/arm/mach-s3c2442/Kconfig"
703 source "arch/arm/mach-s3c2443/Kconfig"
707 source "arch/arm/mach-s3c6400/Kconfig"
708 source "arch/arm/mach-s3c6410/Kconfig"
711 source "arch/arm/plat-stmp3xxx/Kconfig"
713 source "arch/arm/mach-lh7a40x/Kconfig"
715 source "arch/arm/mach-h720x/Kconfig"
717 source "arch/arm/mach-versatile/Kconfig"
719 source "arch/arm/mach-aaec2000/Kconfig"
721 source "arch/arm/mach-realview/Kconfig"
723 source "arch/arm/mach-at91/Kconfig"
725 source "arch/arm/plat-mxc/Kconfig"
727 source "arch/arm/mach-netx/Kconfig"
729 source "arch/arm/mach-ns9xxx/Kconfig"
731 source "arch/arm/mach-davinci/Kconfig"
733 source "arch/arm/mach-ks8695/Kconfig"
735 source "arch/arm/mach-msm/Kconfig"
737 source "arch/arm/mach-u300/Kconfig"
739 source "arch/arm/mach-w90x900/Kconfig"
741 # Definitions to make life easier
754 source arch/arm/mm/Kconfig
757 bool "Enable iWMMXt support"
758 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
759 default y if PXA27x || PXA3xx || ARCH_MMP
761 Enable support for iWMMXt context switching at run time if
762 running on a CPU that supports it.
764 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
767 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
771 source "arch/arm/Kconfig-nommu"
774 config ARM_ERRATA_411920
775 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
776 depends on CPU_V6 && !SMP
778 Invalidation of the Instruction Cache operation can
779 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
780 It does not affect the MPCore. This option enables the ARM Ltd.
781 recommended workaround.
783 config ARM_ERRATA_430973
784 bool "ARM errata: Stale prediction on replaced interworking branch"
787 This option enables the workaround for the 430973 Cortex-A8
788 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
789 interworking branch is replaced with another code sequence at the
790 same virtual address, whether due to self-modifying code or virtual
791 to physical address re-mapping, Cortex-A8 does not recover from the
792 stale interworking branch prediction. This results in Cortex-A8
793 executing the new code sequence in the incorrect ARM or Thumb state.
794 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
795 and also flushes the branch target cache at every context switch.
796 Note that setting specific bits in the ACTLR register may not be
797 available in non-secure mode.
799 config ARM_ERRATA_458693
800 bool "ARM errata: Processor deadlock when a false hazard is created"
803 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
804 erratum. For very specific sequences of memory operations, it is
805 possible for a hazard condition intended for a cache line to instead
806 be incorrectly associated with a different cache line. This false
807 hazard might then cause a processor deadlock. The workaround enables
808 the L1 caching of the NEON accesses and disables the PLD instruction
809 in the ACTLR register. Note that setting specific bits in the ACTLR
810 register may not be available in non-secure mode.
812 config ARM_ERRATA_460075
813 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
816 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
817 erratum. Any asynchronous access to the L2 cache may encounter a
818 situation in which recent store transactions to the L2 cache are lost
819 and overwritten with stale memory contents from external memory. The
820 workaround disables the write-allocate mode for the L2 cache via the
821 ACTLR register. Note that setting specific bits in the ACTLR register
822 may not be available in non-secure mode.
826 source "arch/arm/common/Kconfig"
828 config FORCE_MAX_ZONEORDER
841 Find out whether you have ISA slots on your motherboard. ISA is the
842 name of a bus system, i.e. the way the CPU talks to the other stuff
843 inside your box. Other bus systems are PCI, EISA, MicroChannel
844 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
845 newer boards don't support it. If you have ISA, say Y, otherwise N.
847 # Select ISA DMA controller support
852 # Select ISA DMA interface
857 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
859 Find out whether you have a PCI motherboard. PCI is the name of a
860 bus system, i.e. the way the CPU talks to the other stuff inside
861 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
862 VESA. If you have PCI, say Y, otherwise N.
867 # Select the host bridge type
868 config PCI_HOST_VIA82C505
870 depends on PCI && ARCH_SHARK
873 config PCI_HOST_ITE8152
875 depends on PCI && MACH_ARMCORE
879 source "drivers/pci/Kconfig"
881 source "drivers/pcmcia/Kconfig"
885 menu "Kernel Features"
887 source "kernel/time/Kconfig"
890 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
891 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
892 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
893 depends on GENERIC_CLOCKEVENTS
894 select USE_GENERIC_SMP_HELPERS
895 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
897 This enables support for systems with more than one CPU. If you have
898 a system with only one CPU, like most personal computers, say N. If
899 you have a system with more than one CPU, say Y.
901 If you say N here, the kernel will run on single and multiprocessor
902 machines, but will use only one CPU of a multiprocessor machine. If
903 you say Y here, the kernel will run on many, but not all, single
904 processor machines. On a single processor machine, the kernel will
905 run faster if you say N here.
907 See also <file:Documentation/i386/IO-APIC.txt>,
908 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
909 <http://www.linuxdoc.org/docs.html#howto>.
911 If you don't know what to do here, say N.
917 This option enables support for the ARM system coherency unit
923 This options enables support for the ARM timer and watchdog unit
926 prompt "Memory split"
929 Select the desired split between kernel and user memory.
931 If you are not absolutely sure what you are doing, leave this
935 bool "3G/1G user/kernel split"
937 bool "2G/2G user/kernel split"
939 bool "1G/3G user/kernel split"
944 default 0x40000000 if VMSPLIT_1G
945 default 0x80000000 if VMSPLIT_2G
949 int "Maximum number of CPUs (2-32)"
955 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
956 depends on SMP && HOTPLUG && EXPERIMENTAL
958 Say Y here to experiment with turning CPUs off and on. CPUs
959 can be controlled through /sys/devices/system/cpu.
962 bool "Use local timer interrupts"
963 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
964 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
966 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
968 Enable support for local timers on SMP platforms, rather then the
969 legacy IPI broadcast method. Local timers allows the system
970 accounting to be spread across the timer interval, preventing a
971 "thundering herd" at every timer tick.
974 bool "Preemptible Kernel (EXPERIMENTAL)"
975 depends on EXPERIMENTAL
977 This option reduces the latency of the kernel when reacting to
978 real-time or interactive events by allowing a low priority process to
979 be preempted even if it is in kernel mode executing a system call.
980 This allows applications to run more reliably even when the system is
983 Say Y here if you are building a kernel for a desktop, embedded
984 or real-time system. Say N if you are unsure.
988 default 128 if ARCH_L7200
989 default 200 if ARCH_EBSA110 || ARCH_S3C2410
990 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
991 default AT91_TIMER_HZ if ARCH_AT91
995 bool "Use the ARM EABI to compile the kernel"
997 This option allows for the kernel to be compiled using the latest
998 ARM ABI (aka EABI). This is only useful if you are using a user
999 space environment that is also compiled with EABI.
1001 Since there are major incompatibilities between the legacy ABI and
1002 EABI, especially with regard to structure member alignment, this
1003 option also changes the kernel syscall calling convention to
1004 disambiguate both ABIs and allow for backward compatibility support
1005 (selected with CONFIG_OABI_COMPAT).
1007 To use this you need GCC version 4.0.0 or later.
1010 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1011 depends on AEABI && EXPERIMENTAL
1014 This option preserves the old syscall interface along with the
1015 new (ARM EABI) one. It also provides a compatibility layer to
1016 intercept syscalls that have structure arguments which layout
1017 in memory differs between the legacy ABI and the new ARM EABI
1018 (only for non "thumb" binaries). This option adds a tiny
1019 overhead to all syscalls and produces a slightly larger kernel.
1020 If you know you'll be using only pure EABI user space then you
1021 can say N here. If this option is not selected and you attempt
1022 to execute a legacy ABI binary then the result will be
1023 UNPREDICTABLE (in fact it can be predicted that it won't work
1024 at all). If in doubt say Y.
1026 config ARCH_HAS_HOLES_MEMORYMODEL
1029 # Discontigmem is deprecated
1030 config ARCH_DISCONTIGMEM_ENABLE
1033 config ARCH_SPARSEMEM_ENABLE
1036 config ARCH_SPARSEMEM_DEFAULT
1037 def_bool ARCH_SPARSEMEM_ENABLE
1039 config ARCH_SELECT_MEMORY_MODEL
1040 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1044 default "4" if ARCH_LH7A40X
1046 depends on NEED_MULTIPLE_NODES
1049 bool "High Memory Support (EXPERIMENTAL)"
1050 depends on MMU && EXPERIMENTAL
1052 The address space of ARM processors is only 4 Gigabytes large
1053 and it has to accommodate user address space, kernel address
1054 space as well as some memory mapped IO. That means that, if you
1055 have a large amount of physical memory and/or IO, not all of the
1056 memory can be "permanently mapped" by the kernel. The physical
1057 memory that is not permanently mapped is called "high memory".
1059 Depending on the selected kernel/user memory split, minimum
1060 vmalloc space and actual amount of RAM, you may not need this
1061 option which should result in a slightly faster kernel.
1068 bool "Timer and CPU usage LEDs"
1069 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1070 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1071 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1072 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1073 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1074 ARCH_AT91 || ARCH_DAVINCI || \
1075 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1077 If you say Y here, the LEDs on your machine will be used
1078 to provide useful information about your current system status.
1080 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1081 be able to select which LEDs are active using the options below. If
1082 you are compiling a kernel for the EBSA-110 or the LART however, the
1083 red LED will simply flash regularly to indicate that the system is
1084 still functional. It is safe to say Y here if you have a CATS
1085 system, but the driver will do nothing.
1088 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1089 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1090 || MACH_OMAP_PERSEUS2
1092 depends on !GENERIC_CLOCKEVENTS
1093 default y if ARCH_EBSA110
1095 If you say Y here, one of the system LEDs (the green one on the
1096 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1097 will flash regularly to indicate that the system is still
1098 operational. This is mainly useful to kernel hackers who are
1099 debugging unstable kernels.
1101 The LART uses the same LED for both Timer LED and CPU usage LED
1102 functions. You may choose to use both, but the Timer LED function
1103 will overrule the CPU usage LED.
1106 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1108 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1109 || MACH_OMAP_PERSEUS2
1112 If you say Y here, the red LED will be used to give a good real
1113 time indication of CPU usage, by lighting whenever the idle task
1114 is not currently executing.
1116 The LART uses the same LED for both Timer LED and CPU usage LED
1117 functions. You may choose to use both, but the Timer LED function
1118 will overrule the CPU usage LED.
1120 config ALIGNMENT_TRAP
1122 depends on CPU_CP15_MMU
1123 default y if !ARCH_EBSA110
1125 ARM processors cannot fetch/store information which is not
1126 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1127 address divisible by 4. On 32-bit ARM processors, these non-aligned
1128 fetch/store instructions will be emulated in software if you say
1129 here, which has a severe performance impact. This is necessary for
1130 correct operation of some network protocols. With an IP-only
1131 configuration it is safe to say N, otherwise say Y.
1133 config UACCESS_WITH_MEMCPY
1134 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1135 depends on MMU && EXPERIMENTAL
1136 default y if CPU_FEROCEON
1138 Implement faster copy_to_user and clear_user methods for CPU
1139 cores where a 8-word STM instruction give significantly higher
1140 memory write throughput than a sequence of individual 32bit stores.
1142 A possible side effect is a slight increase in scheduling latency
1143 between threads sharing the same address space if they invoke
1144 such copy operations with large buffers.
1146 However, if the CPU data cache is using a write-allocate mode,
1147 this option is unlikely to provide any performance gain.
1153 # Compressed boot loader in ROM. Yes, we really want to ask about
1154 # TEXT and BSS so we preserve their values in the config files.
1155 config ZBOOT_ROM_TEXT
1156 hex "Compressed ROM boot loader base address"
1159 The physical address at which the ROM-able zImage is to be
1160 placed in the target. Platforms which normally make use of
1161 ROM-able zImage formats normally set this to a suitable
1162 value in their defconfig file.
1164 If ZBOOT_ROM is not enabled, this has no effect.
1166 config ZBOOT_ROM_BSS
1167 hex "Compressed ROM boot loader BSS address"
1170 The base address of an area of read/write memory in the target
1171 for the ROM-able zImage which must be available while the
1172 decompressor is running. It must be large enough to hold the
1173 entire decompressed kernel plus an additional 128 KiB.
1174 Platforms which normally make use of ROM-able zImage formats
1175 normally set this to a suitable value in their defconfig file.
1177 If ZBOOT_ROM is not enabled, this has no effect.
1180 bool "Compressed boot loader in ROM/flash"
1181 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1183 Say Y here if you intend to execute your compressed kernel image
1184 (zImage) directly from ROM or flash. If unsure, say N.
1187 string "Default kernel command string"
1190 On some architectures (EBSA110 and CATS), there is currently no way
1191 for the boot loader to pass arguments to the kernel. For these
1192 architectures, you should supply some command-line options at build
1193 time by entering them here. As a minimum, you should specify the
1194 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1197 bool "Kernel Execute-In-Place from ROM"
1198 depends on !ZBOOT_ROM
1200 Execute-In-Place allows the kernel to run from non-volatile storage
1201 directly addressable by the CPU, such as NOR flash. This saves RAM
1202 space since the text section of the kernel is not loaded from flash
1203 to RAM. Read-write sections, such as the data section and stack,
1204 are still copied to RAM. The XIP kernel is not compressed since
1205 it has to run directly from flash, so it will take more space to
1206 store it. The flash address used to link the kernel object files,
1207 and for storing it, is configuration dependent. Therefore, if you
1208 say Y here, you must know the proper physical address where to
1209 store the kernel image depending on your own flash memory usage.
1211 Also note that the make target becomes "make xipImage" rather than
1212 "make zImage" or "make Image". The final kernel binary to put in
1213 ROM memory will be arch/arm/boot/xipImage.
1217 config XIP_PHYS_ADDR
1218 hex "XIP Kernel Physical Location"
1219 depends on XIP_KERNEL
1220 default "0x00080000"
1222 This is the physical address in your flash memory the kernel will
1223 be linked for and stored to. This address is dependent on your
1227 bool "Kexec system call (EXPERIMENTAL)"
1228 depends on EXPERIMENTAL
1230 kexec is a system call that implements the ability to shutdown your
1231 current kernel, and to start another kernel. It is like a reboot
1232 but it is independent of the system firmware. And like a reboot
1233 you can start any kernel with it, not just Linux.
1235 It is an ongoing process to be certain the hardware in a machine
1236 is properly shutdown, so do not be surprised if this code does not
1237 initially work for you. It may help to enable device hotplugging
1241 bool "Export atags in procfs"
1245 Should the atags used to boot the kernel be exported in an "atags"
1246 file in procfs. Useful with kexec.
1250 menu "CPU Power Management"
1252 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA || ARCH_S3C64XX)
1254 source "drivers/cpufreq/Kconfig"
1256 config CPU_FREQ_SA1100
1258 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1261 config CPU_FREQ_SA1110
1263 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1266 config CPU_FREQ_INTEGRATOR
1267 tristate "CPUfreq driver for ARM Integrator CPUs"
1268 depends on ARCH_INTEGRATOR && CPU_FREQ
1271 This enables the CPUfreq driver for ARM Integrator CPUs.
1273 For details, take a look at <file:Documentation/cpu-freq>.
1279 depends on CPU_FREQ && ARCH_PXA && PXA25x
1281 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1283 config CPU_FREQ_S3C64XX
1284 bool "CPUfreq support for Samsung S3C64XX CPUs"
1285 depends on CPU_FREQ && CPU_S3C6410
1289 source "drivers/cpuidle/Kconfig"
1293 menu "Floating point emulation"
1295 comment "At least one emulation must be selected"
1298 bool "NWFPE math emulation"
1299 depends on !AEABI || OABI_COMPAT
1301 Say Y to include the NWFPE floating point emulator in the kernel.
1302 This is necessary to run most binaries. Linux does not currently
1303 support floating point hardware so you need to say Y here even if
1304 your machine has an FPA or floating point co-processor podule.
1306 You may say N here if you are going to load the Acorn FPEmulator
1307 early in the bootup.
1310 bool "Support extended precision"
1311 depends on FPE_NWFPE
1313 Say Y to include 80-bit support in the kernel floating-point
1314 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1315 Note that gcc does not generate 80-bit operations by default,
1316 so in most cases this option only enlarges the size of the
1317 floating point emulator without any good reason.
1319 You almost surely want to say N here.
1322 bool "FastFPE math emulation (EXPERIMENTAL)"
1323 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1325 Say Y here to include the FAST floating point emulator in the kernel.
1326 This is an experimental much faster emulator which now also has full
1327 precision for the mantissa. It does not support any exceptions.
1328 It is very simple, and approximately 3-6 times faster than NWFPE.
1330 It should be sufficient for most programs. It may be not suitable
1331 for scientific calculations, but you have to check this for yourself.
1332 If you do not feel you need a faster FP emulation you should better
1336 bool "VFP-format floating point maths"
1337 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1339 Say Y to include VFP support code in the kernel. This is needed
1340 if your hardware includes a VFP unit.
1342 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1343 release notes and additional status information.
1345 Say N if your target does not have VFP hardware.
1353 bool "Advanced SIMD (NEON) Extension support"
1354 depends on VFPv3 && CPU_V7
1356 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1361 menu "Userspace binary formats"
1363 source "fs/Kconfig.binfmt"
1366 tristate "RISC OS personality"
1369 Say Y here to include the kernel code necessary if you want to run
1370 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1371 experimental; if this sounds frightening, say N and sleep in peace.
1372 You can also say M here to compile this support as a module (which
1373 will be called arthur).
1377 menu "Power management options"
1379 source "kernel/power/Kconfig"
1381 config ARCH_SUSPEND_POSSIBLE
1386 source "net/Kconfig"
1388 menu "Device Drivers"
1390 source "drivers/base/Kconfig"
1392 source "drivers/connector/Kconfig"
1394 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1395 source "drivers/mtd/Kconfig"
1398 source "drivers/parport/Kconfig"
1400 source "drivers/pnp/Kconfig"
1402 source "drivers/block/Kconfig"
1404 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1406 source "drivers/misc/Kconfig"
1408 source "drivers/ide/Kconfig"
1410 source "drivers/scsi/Kconfig"
1412 source "drivers/ata/Kconfig"
1414 source "drivers/md/Kconfig"
1416 source "drivers/message/fusion/Kconfig"
1418 source "drivers/ieee1394/Kconfig"
1420 source "drivers/message/i2o/Kconfig"
1422 source "drivers/net/Kconfig"
1424 source "drivers/isdn/Kconfig"
1426 # input before char - char/joystick depends on it. As does USB.
1428 source "drivers/input/Kconfig"
1430 source "drivers/char/Kconfig"
1432 source "drivers/i2c/Kconfig"
1434 source "drivers/spi/Kconfig"
1436 source "drivers/gpio/Kconfig"
1438 source "drivers/w1/Kconfig"
1440 source "drivers/power/Kconfig"
1442 source "drivers/hwmon/Kconfig"
1444 source "drivers/thermal/Kconfig"
1446 source "drivers/watchdog/Kconfig"
1448 source "drivers/ssb/Kconfig"
1450 #source "drivers/l3/Kconfig"
1452 source "drivers/mfd/Kconfig"
1454 source "drivers/media/Kconfig"
1456 source "drivers/video/Kconfig"
1458 source "sound/Kconfig"
1460 source "drivers/hid/Kconfig"
1462 source "drivers/usb/Kconfig"
1464 source "drivers/uwb/Kconfig"
1466 source "drivers/mmc/Kconfig"
1468 source "drivers/memstick/Kconfig"
1470 source "drivers/accessibility/Kconfig"
1472 source "drivers/leds/Kconfig"
1474 source "drivers/rtc/Kconfig"
1476 source "drivers/dma/Kconfig"
1478 source "drivers/dca/Kconfig"
1480 source "drivers/auxdisplay/Kconfig"
1482 source "drivers/regulator/Kconfig"
1484 source "drivers/uio/Kconfig"
1486 source "drivers/staging/Kconfig"
1492 source "arch/arm/Kconfig.debug"
1494 source "security/Kconfig"
1496 source "crypto/Kconfig"
1498 source "lib/Kconfig"