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
43 config GENERIC_CLOCKEVENTS
47 config GENERIC_CLOCKEVENTS_BROADCAST
49 depends on GENERIC_CLOCKEVENTS
50 default y if SMP && !LOCAL_TIMERS
63 The Extended Industry Standard Architecture (EISA) bus was
64 developed as an open alternative to the IBM MicroChannel bus.
66 The EISA bus provided some of the features of the IBM MicroChannel
67 bus while maintaining backward compatibility with cards made for
68 the older ISA bus. The EISA bus saw limited use between 1988 and
69 1995 when it was made obsolete by the PCI bus.
71 Say Y here if you are building a kernel for an EISA-based machine.
81 MicroChannel Architecture is found in some IBM PS/2 machines and
82 laptops. It is a bus system similar to PCI or ISA. See
83 <file:Documentation/mca.txt> (and especially the web page given
84 there) before attempting to build an MCA bus kernel.
86 config GENERIC_HARDIRQS
90 config STACKTRACE_SUPPORT
94 config HAVE_LATENCYTOP_SUPPORT
99 config LOCKDEP_SUPPORT
103 config TRACE_IRQFLAGS_SUPPORT
107 config HARDIRQS_SW_RESEND
111 config GENERIC_IRQ_PROBE
115 config GENERIC_LOCKBREAK
118 depends on SMP && PREEMPT
120 config RWSEM_GENERIC_SPINLOCK
124 config RWSEM_XCHGADD_ALGORITHM
127 config ARCH_HAS_ILOG2_U32
131 config ARCH_HAS_ILOG2_U64
135 config GENERIC_HWEIGHT
139 config GENERIC_CALIBRATE_DELAY
143 config ARCH_MAY_HAVE_PC_FDC
149 config GENERIC_ISA_DMA
158 config GENERIC_HARDIRQS_NO__DO_IRQ
163 config OPROFILE_ARMV6
165 depends on CPU_V6 && !SMP
166 select OPROFILE_ARM11_CORE
168 config OPROFILE_MPCORE
170 depends on CPU_V6 && SMP
171 select OPROFILE_ARM11_CORE
173 config OPROFILE_ARM11_CORE
176 config OPROFILE_ARMV7
178 depends on CPU_V7 && !SMP
185 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
186 default DRAM_BASE if REMAP_VECTORS_TO_RAM
189 The base address of exception vectors.
191 source "init/Kconfig"
193 source "kernel/Kconfig.freezer"
198 prompt "ARM system type"
199 default ARCH_VERSATILE
202 bool "Agilent AAEC-2000 based"
207 This enables support for systems based on the Agilent AAEC-2000
209 config ARCH_INTEGRATOR
210 bool "ARM Ltd. Integrator family"
216 Support for ARM's Integrator platform.
219 bool "ARM Ltd. RealView family"
225 select GENERIC_CLOCKEVENTS
227 This enables support for ARM Ltd RealView boards.
229 config ARCH_VERSATILE
230 bool "ARM Ltd. Versatile family"
237 select GENERIC_CLOCKEVENTS
239 This enables support for ARM Ltd Versatile board.
244 select ARCH_REQUIRE_GPIOLIB
247 This enables support for systems based on the Atmel AT91RM9200,
248 AT91SAM9 and AT91CAP9 processors.
251 bool "Cirrus Logic CLPS711x/EP721x-based"
254 Support for Cirrus Logic 711x/721x based boards.
262 This is an evaluation board for the StrongARM processor available
263 from Digital. It has limited hardware on-board, including an
264 Ethernet interface, two PCMCIA sockets, two serial ports and a
275 select ARCH_REQUIRE_GPIOLIB
277 This enables support for the Cirrus EP93xx series of CPUs.
280 bool "Cortina Systems Gemini"
283 select ARCH_REQUIRE_GPIOLIB
285 Support for the Cortina Systems Gemini family SoCs
287 config ARCH_FOOTBRIDGE
292 Support for systems based on the DC21285 companion chip
293 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
296 bool "Hilscher NetX based"
299 select GENERIC_CLOCKEVENTS
302 This enables support for systems based on the Hilscher NetX Soc
305 bool "Hynix HMS720x-based"
309 This enables support for systems based on the Hynix HMS720x
316 select GENERIC_CLOCKEVENTS
318 Support for Motorola's i.MX family of processors (MX1, MXL).
326 select ARCH_SUPPORTS_MSI
329 Support for Intel's IOP13XX (XScale) family of processors.
338 select ARCH_REQUIRE_GPIOLIB
340 Support for Intel's 80219 and IOP32X (XScale) family of
350 select ARCH_REQUIRE_GPIOLIB
352 Support for Intel's IOP33X (XScale) family of processors.
360 Support for Intel's IXP23xx (XScale) family of processors.
363 bool "IXP2400/2800-based"
368 Support for Intel's IXP2400/2800 (XScale) family of processors.
376 select GENERIC_CLOCKEVENTS
377 select DMABOUNCE if PCI
379 Support for Intel's IXP4XX (XScale) family of processors.
386 Say Y here if you intend to run this kernel on a LinkUp Systems
387 L7200 Software Development Board which uses an ARM720T processor.
388 Information on this board can be obtained at:
390 <http://www.linkupsys.com/>
392 If you have any questions or comments about the Linux kernel port
393 to this board, send e-mail to <sjhill@cotw.com>.
396 bool "Marvell Kirkwood"
401 select GENERIC_CLOCKEVENTS
404 Support for the following Marvell Kirkwood series SoCs:
405 88F6180, 88F6192 and 88F6281.
408 bool "Micrel/Kendin KS8695"
411 select ARCH_REQUIRE_GPIOLIB
413 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
414 System-on-Chip devices.
417 bool "NetSilicon NS9xxx"
421 select GENERIC_CLOCKEVENTS
424 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
427 <http://www.digi.com/products/microprocessors/index.jsp>
430 bool "Marvell Loki (88RC8480)"
433 select GENERIC_CLOCKEVENTS
436 Support for the Marvell Loki (88RC8480) SoC.
439 bool "Marvell MV78xx0"
444 select GENERIC_CLOCKEVENTS
447 Support for the following Marvell MV78xx0 series SoCs:
451 bool "Freescale MXC/iMX-based"
453 select GENERIC_CLOCKEVENTS
456 select ARCH_REQUIRE_GPIOLIB
458 Support for Freescale MXC/iMX-based family of processors
467 select GENERIC_CLOCKEVENTS
470 Support for the following Marvell Orion 5x series SoCs:
471 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
472 Orion-2 (5281), Orion-1-90 (6183).
475 bool "Philips Nexperia PNX4008 Mobile"
479 This enables support for Philips PNX4008 mobile platform.
482 bool "PXA2xx/PXA3xx-based"
488 select ARCH_REQUIRE_GPIOLIB
490 select GENERIC_CLOCKEVENTS
494 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
497 bool "Marvell PXA168/910"
500 select ARCH_REQUIRE_GPIOLIB
504 select GENERIC_CLOCKEVENTS
508 Support for Marvell's PXA168/910 processor line.
515 select ARCH_MAY_HAVE_PC_FDC
516 select HAVE_PATA_PLATFORM
519 select ARCH_SPARSEMEM_ENABLE
521 On the Acorn Risc-PC, Linux can support the internal IDE disk and
522 CD-ROM interface, serial and parallel port, and the floppy drive.
528 select ARCH_SPARSEMEM_ENABLE
532 select GENERIC_CLOCKEVENTS
535 select ARCH_REQUIRE_GPIOLIB
537 Support for StrongARM 11x0 based boards.
540 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
544 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
545 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
546 the Samsung SMDK2410 development board (and derivatives).
549 bool "Samsung S3C64XX"
553 Samsung S3C64XX series based systems
563 Support for the StrongARM based Digital DNARD machine, also known
564 as "Shark" (<http://www.shark-linux.de/shark.html>).
569 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
570 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
572 Say Y here for systems based on one of the Sharp LH7A40X
573 System on a Chip processors. These CPUs include an ARM922T
574 core with a wide array of integrated devices for
575 hand-held and low-power applications.
581 select GENERIC_CLOCKEVENTS
583 select ARCH_REQUIRE_GPIOLIB
589 Support for TI's DaVinci platform.
595 select ARCH_REQUIRE_GPIOLIB
597 select GENERIC_CLOCKEVENTS
599 Support for TI's OMAP platform (OMAP1 and OMAP2).
605 select GENERIC_CLOCKEVENTS
607 Support for Qualcomm MSM7K based systems. This runs on the ARM11
608 apps processor of the MSM7K and depends on a shared memory
609 interface to the ARM9 modem processor which runs the baseband stack
610 and controls some vital subsystems (clock and power control, etc).
613 bool "Nuvoton W90X900 CPU"
616 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
617 can login www.mcuos.com or www.nuvoton.com to know more.
621 source "arch/arm/mach-clps711x/Kconfig"
623 source "arch/arm/mach-ep93xx/Kconfig"
625 source "arch/arm/mach-footbridge/Kconfig"
627 source "arch/arm/mach-gemini/Kconfig"
629 source "arch/arm/mach-integrator/Kconfig"
631 source "arch/arm/mach-iop32x/Kconfig"
633 source "arch/arm/mach-iop33x/Kconfig"
635 source "arch/arm/mach-iop13xx/Kconfig"
637 source "arch/arm/mach-ixp4xx/Kconfig"
639 source "arch/arm/mach-ixp2000/Kconfig"
641 source "arch/arm/mach-ixp23xx/Kconfig"
643 source "arch/arm/mach-loki/Kconfig"
645 source "arch/arm/mach-mv78xx0/Kconfig"
647 source "arch/arm/mach-pxa/Kconfig"
648 source "arch/arm/plat-pxa/Kconfig"
650 source "arch/arm/mach-mmp/Kconfig"
652 source "arch/arm/mach-sa1100/Kconfig"
654 source "arch/arm/plat-omap/Kconfig"
656 source "arch/arm/mach-omap1/Kconfig"
658 source "arch/arm/mach-omap2/Kconfig"
660 source "arch/arm/mach-orion5x/Kconfig"
662 source "arch/arm/mach-kirkwood/Kconfig"
664 source "arch/arm/plat-s3c24xx/Kconfig"
665 source "arch/arm/plat-s3c64xx/Kconfig"
666 source "arch/arm/plat-s3c/Kconfig"
669 source "arch/arm/mach-s3c2400/Kconfig"
670 source "arch/arm/mach-s3c2410/Kconfig"
671 source "arch/arm/mach-s3c2412/Kconfig"
672 source "arch/arm/mach-s3c2440/Kconfig"
673 source "arch/arm/mach-s3c2442/Kconfig"
674 source "arch/arm/mach-s3c2443/Kconfig"
678 source "arch/arm/mach-s3c6400/Kconfig"
679 source "arch/arm/mach-s3c6410/Kconfig"
682 source "arch/arm/mach-lh7a40x/Kconfig"
684 source "arch/arm/mach-imx/Kconfig"
686 source "arch/arm/mach-h720x/Kconfig"
688 source "arch/arm/mach-versatile/Kconfig"
690 source "arch/arm/mach-aaec2000/Kconfig"
692 source "arch/arm/mach-realview/Kconfig"
694 source "arch/arm/mach-at91/Kconfig"
696 source "arch/arm/plat-mxc/Kconfig"
698 source "arch/arm/mach-netx/Kconfig"
700 source "arch/arm/mach-ns9xxx/Kconfig"
702 source "arch/arm/mach-davinci/Kconfig"
704 source "arch/arm/mach-ks8695/Kconfig"
706 source "arch/arm/mach-msm/Kconfig"
708 source "arch/arm/mach-w90x900/Kconfig"
710 # Definitions to make life easier
723 source arch/arm/mm/Kconfig
726 bool "Enable iWMMXt support"
727 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
728 default y if PXA27x || PXA3xx || ARCH_MMP
730 Enable support for iWMMXt context switching at run time if
731 running on a CPU that supports it.
733 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
736 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
740 source "arch/arm/Kconfig-nommu"
743 config ARM_ERRATA_411920
744 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
745 depends on CPU_V6 && !SMP
747 Invalidation of the Instruction Cache operation can
748 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
749 It does not affect the MPCore. This option enables the ARM Ltd.
750 recommended workaround.
752 config ARM_ERRATA_430973
753 bool "ARM errata: Stale prediction on replaced interworking branch"
756 This option enables the workaround for the 430973 Cortex-A8
757 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
758 interworking branch is replaced with another code sequence at the
759 same virtual address, whether due to self-modifying code or virtual
760 to physical address re-mapping, Cortex-A8 does not recover from the
761 stale interworking branch prediction. This results in Cortex-A8
762 executing the new code sequence in the incorrect ARM or Thumb state.
763 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
764 and also flushes the branch target cache at every context switch.
765 Note that setting specific bits in the ACTLR register may not be
766 available in non-secure mode.
768 config ARM_ERRATA_458693
769 bool "ARM errata: Processor deadlock when a false hazard is created"
772 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
773 erratum. For very specific sequences of memory operations, it is
774 possible for a hazard condition intended for a cache line to instead
775 be incorrectly associated with a different cache line. This false
776 hazard might then cause a processor deadlock. The workaround enables
777 the L1 caching of the NEON accesses and disables the PLD instruction
778 in the ACTLR register. Note that setting specific bits in the ACTLR
779 register may not be available in non-secure mode.
781 config ARM_ERRATA_460075
782 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
785 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
786 erratum. Any asynchronous access to the L2 cache may encounter a
787 situation in which recent store transactions to the L2 cache are lost
788 and overwritten with stale memory contents from external memory. The
789 workaround disables the write-allocate mode for the L2 cache via the
790 ACTLR register. Note that setting specific bits in the ACTLR register
791 may not be available in non-secure mode.
795 source "arch/arm/common/Kconfig"
797 config FORCE_MAX_ZONEORDER
810 Find out whether you have ISA slots on your motherboard. ISA is the
811 name of a bus system, i.e. the way the CPU talks to the other stuff
812 inside your box. Other bus systems are PCI, EISA, MicroChannel
813 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
814 newer boards don't support it. If you have ISA, say Y, otherwise N.
816 # Select ISA DMA controller support
821 # Select ISA DMA interface
826 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
828 Find out whether you have a PCI motherboard. PCI is the name of a
829 bus system, i.e. the way the CPU talks to the other stuff inside
830 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
831 VESA. If you have PCI, say Y, otherwise N.
836 # Select the host bridge type
837 config PCI_HOST_VIA82C505
839 depends on PCI && ARCH_SHARK
842 config PCI_HOST_ITE8152
844 depends on PCI && MACH_ARMCORE
848 source "drivers/pci/Kconfig"
850 source "drivers/pcmcia/Kconfig"
854 menu "Kernel Features"
856 source "kernel/time/Kconfig"
859 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
860 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
861 select USE_GENERIC_SMP_HELPERS
863 This enables support for systems with more than one CPU. If you have
864 a system with only one CPU, like most personal computers, say N. If
865 you have a system with more than one CPU, say Y.
867 If you say N here, the kernel will run on single and multiprocessor
868 machines, but will use only one CPU of a multiprocessor machine. If
869 you say Y here, the kernel will run on many, but not all, single
870 processor machines. On a single processor machine, the kernel will
871 run faster if you say N here.
873 See also <file:Documentation/i386/IO-APIC.txt>,
874 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
875 <http://www.linuxdoc.org/docs.html#howto>.
877 If you don't know what to do here, say N.
880 prompt "Memory split"
883 Select the desired split between kernel and user memory.
885 If you are not absolutely sure what you are doing, leave this
889 bool "3G/1G user/kernel split"
891 bool "2G/2G user/kernel split"
893 bool "1G/3G user/kernel split"
898 default 0x40000000 if VMSPLIT_1G
899 default 0x80000000 if VMSPLIT_2G
903 int "Maximum number of CPUs (2-32)"
909 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
910 depends on SMP && HOTPLUG && EXPERIMENTAL
912 Say Y here to experiment with turning CPUs off and on. CPUs
913 can be controlled through /sys/devices/system/cpu.
916 bool "Use local timer interrupts"
917 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
920 Enable support for local timers on SMP platforms, rather then the
921 legacy IPI broadcast method. Local timers allows the system
922 accounting to be spread across the timer interval, preventing a
923 "thundering herd" at every timer tick.
926 bool "Preemptible Kernel (EXPERIMENTAL)"
927 depends on EXPERIMENTAL
929 This option reduces the latency of the kernel when reacting to
930 real-time or interactive events by allowing a low priority process to
931 be preempted even if it is in kernel mode executing a system call.
932 This allows applications to run more reliably even when the system is
935 Say Y here if you are building a kernel for a desktop, embedded
936 or real-time system. Say N if you are unsure.
940 default 128 if ARCH_L7200
941 default 200 if ARCH_EBSA110 || ARCH_S3C2410
942 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
943 default AT91_TIMER_HZ if ARCH_AT91
947 bool "Use the ARM EABI to compile the kernel"
949 This option allows for the kernel to be compiled using the latest
950 ARM ABI (aka EABI). This is only useful if you are using a user
951 space environment that is also compiled with EABI.
953 Since there are major incompatibilities between the legacy ABI and
954 EABI, especially with regard to structure member alignment, this
955 option also changes the kernel syscall calling convention to
956 disambiguate both ABIs and allow for backward compatibility support
957 (selected with CONFIG_OABI_COMPAT).
959 To use this you need GCC version 4.0.0 or later.
962 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
963 depends on AEABI && EXPERIMENTAL
966 This option preserves the old syscall interface along with the
967 new (ARM EABI) one. It also provides a compatibility layer to
968 intercept syscalls that have structure arguments which layout
969 in memory differs between the legacy ABI and the new ARM EABI
970 (only for non "thumb" binaries). This option adds a tiny
971 overhead to all syscalls and produces a slightly larger kernel.
972 If you know you'll be using only pure EABI user space then you
973 can say N here. If this option is not selected and you attempt
974 to execute a legacy ABI binary then the result will be
975 UNPREDICTABLE (in fact it can be predicted that it won't work
976 at all). If in doubt say Y.
978 config ARCH_FLATMEM_HAS_HOLES
983 # Discontigmem is deprecated
984 config ARCH_DISCONTIGMEM_ENABLE
987 config ARCH_SPARSEMEM_ENABLE
990 config ARCH_SPARSEMEM_DEFAULT
991 def_bool ARCH_SPARSEMEM_ENABLE
993 config ARCH_SELECT_MEMORY_MODEL
994 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
998 default "4" if ARCH_LH7A40X
1000 depends on NEED_MULTIPLE_NODES
1003 bool "High Memory Support (EXPERIMENTAL)"
1004 depends on MMU && EXPERIMENTAL
1006 The address space of ARM processors is only 4 Gigabytes large
1007 and it has to accommodate user address space, kernel address
1008 space as well as some memory mapped IO. That means that, if you
1009 have a large amount of physical memory and/or IO, not all of the
1010 memory can be "permanently mapped" by the kernel. The physical
1011 memory that is not permanently mapped is called "high memory".
1013 Depending on the selected kernel/user memory split, minimum
1014 vmalloc space and actual amount of RAM, you may not need this
1015 option which should result in a slightly faster kernel.
1022 bool "Timer and CPU usage LEDs"
1023 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1024 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
1025 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1026 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1027 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1028 ARCH_AT91 || ARCH_DAVINCI || \
1029 ARCH_KS8695 || MACH_RD88F5182
1031 If you say Y here, the LEDs on your machine will be used
1032 to provide useful information about your current system status.
1034 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1035 be able to select which LEDs are active using the options below. If
1036 you are compiling a kernel for the EBSA-110 or the LART however, the
1037 red LED will simply flash regularly to indicate that the system is
1038 still functional. It is safe to say Y here if you have a CATS
1039 system, but the driver will do nothing.
1042 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1043 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1044 || MACH_OMAP_PERSEUS2
1046 depends on !GENERIC_CLOCKEVENTS
1047 default y if ARCH_EBSA110
1049 If you say Y here, one of the system LEDs (the green one on the
1050 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1051 will flash regularly to indicate that the system is still
1052 operational. This is mainly useful to kernel hackers who are
1053 debugging unstable kernels.
1055 The LART uses the same LED for both Timer LED and CPU usage LED
1056 functions. You may choose to use both, but the Timer LED function
1057 will overrule the CPU usage LED.
1060 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1062 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1063 || MACH_OMAP_PERSEUS2
1066 If you say Y here, the red LED will be used to give a good real
1067 time indication of CPU usage, by lighting whenever the idle task
1068 is not currently executing.
1070 The LART uses the same LED for both Timer LED and CPU usage LED
1071 functions. You may choose to use both, but the Timer LED function
1072 will overrule the CPU usage LED.
1074 config ALIGNMENT_TRAP
1076 depends on CPU_CP15_MMU
1077 default y if !ARCH_EBSA110
1079 ARM processors cannot fetch/store information which is not
1080 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1081 address divisible by 4. On 32-bit ARM processors, these non-aligned
1082 fetch/store instructions will be emulated in software if you say
1083 here, which has a severe performance impact. This is necessary for
1084 correct operation of some network protocols. With an IP-only
1085 configuration it is safe to say N, otherwise say Y.
1091 # Compressed boot loader in ROM. Yes, we really want to ask about
1092 # TEXT and BSS so we preserve their values in the config files.
1093 config ZBOOT_ROM_TEXT
1094 hex "Compressed ROM boot loader base address"
1097 The physical address at which the ROM-able zImage is to be
1098 placed in the target. Platforms which normally make use of
1099 ROM-able zImage formats normally set this to a suitable
1100 value in their defconfig file.
1102 If ZBOOT_ROM is not enabled, this has no effect.
1104 config ZBOOT_ROM_BSS
1105 hex "Compressed ROM boot loader BSS address"
1108 The base address of an area of read/write memory in the target
1109 for the ROM-able zImage which must be available while the
1110 decompressor is running. It must be large enough to hold the
1111 entire decompressed kernel plus an additional 128 KiB.
1112 Platforms which normally make use of ROM-able zImage formats
1113 normally set this to a suitable value in their defconfig file.
1115 If ZBOOT_ROM is not enabled, this has no effect.
1118 bool "Compressed boot loader in ROM/flash"
1119 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1121 Say Y here if you intend to execute your compressed kernel image
1122 (zImage) directly from ROM or flash. If unsure, say N.
1125 string "Default kernel command string"
1128 On some architectures (EBSA110 and CATS), there is currently no way
1129 for the boot loader to pass arguments to the kernel. For these
1130 architectures, you should supply some command-line options at build
1131 time by entering them here. As a minimum, you should specify the
1132 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1135 bool "Kernel Execute-In-Place from ROM"
1136 depends on !ZBOOT_ROM
1138 Execute-In-Place allows the kernel to run from non-volatile storage
1139 directly addressable by the CPU, such as NOR flash. This saves RAM
1140 space since the text section of the kernel is not loaded from flash
1141 to RAM. Read-write sections, such as the data section and stack,
1142 are still copied to RAM. The XIP kernel is not compressed since
1143 it has to run directly from flash, so it will take more space to
1144 store it. The flash address used to link the kernel object files,
1145 and for storing it, is configuration dependent. Therefore, if you
1146 say Y here, you must know the proper physical address where to
1147 store the kernel image depending on your own flash memory usage.
1149 Also note that the make target becomes "make xipImage" rather than
1150 "make zImage" or "make Image". The final kernel binary to put in
1151 ROM memory will be arch/arm/boot/xipImage.
1155 config XIP_PHYS_ADDR
1156 hex "XIP Kernel Physical Location"
1157 depends on XIP_KERNEL
1158 default "0x00080000"
1160 This is the physical address in your flash memory the kernel will
1161 be linked for and stored to. This address is dependent on your
1165 bool "Kexec system call (EXPERIMENTAL)"
1166 depends on EXPERIMENTAL
1168 kexec is a system call that implements the ability to shutdown your
1169 current kernel, and to start another kernel. It is like a reboot
1170 but it is independent of the system firmware. And like a reboot
1171 you can start any kernel with it, not just Linux.
1173 It is an ongoing process to be certain the hardware in a machine
1174 is properly shutdown, so do not be surprised if this code does not
1175 initially work for you. It may help to enable device hotplugging
1179 bool "Export atags in procfs"
1183 Should the atags used to boot the kernel be exported in an "atags"
1184 file in procfs. Useful with kexec.
1188 menu "CPU Power Management"
1190 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1192 source "drivers/cpufreq/Kconfig"
1194 config CPU_FREQ_SA1100
1196 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1199 config CPU_FREQ_SA1110
1201 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1204 config CPU_FREQ_INTEGRATOR
1205 tristate "CPUfreq driver for ARM Integrator CPUs"
1206 depends on ARCH_INTEGRATOR && CPU_FREQ
1209 This enables the CPUfreq driver for ARM Integrator CPUs.
1211 For details, take a look at <file:Documentation/cpu-freq>.
1216 tristate "CPUfreq driver for i.MX CPUs"
1217 depends on ARCH_IMX && CPU_FREQ
1220 This enables the CPUfreq driver for i.MX CPUs.
1226 source "drivers/cpuidle/Kconfig"
1230 menu "Floating point emulation"
1232 comment "At least one emulation must be selected"
1235 bool "NWFPE math emulation"
1236 depends on !AEABI || OABI_COMPAT
1238 Say Y to include the NWFPE floating point emulator in the kernel.
1239 This is necessary to run most binaries. Linux does not currently
1240 support floating point hardware so you need to say Y here even if
1241 your machine has an FPA or floating point co-processor podule.
1243 You may say N here if you are going to load the Acorn FPEmulator
1244 early in the bootup.
1247 bool "Support extended precision"
1248 depends on FPE_NWFPE
1250 Say Y to include 80-bit support in the kernel floating-point
1251 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1252 Note that gcc does not generate 80-bit operations by default,
1253 so in most cases this option only enlarges the size of the
1254 floating point emulator without any good reason.
1256 You almost surely want to say N here.
1259 bool "FastFPE math emulation (EXPERIMENTAL)"
1260 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1262 Say Y here to include the FAST floating point emulator in the kernel.
1263 This is an experimental much faster emulator which now also has full
1264 precision for the mantissa. It does not support any exceptions.
1265 It is very simple, and approximately 3-6 times faster than NWFPE.
1267 It should be sufficient for most programs. It may be not suitable
1268 for scientific calculations, but you have to check this for yourself.
1269 If you do not feel you need a faster FP emulation you should better
1273 bool "VFP-format floating point maths"
1274 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1276 Say Y to include VFP support code in the kernel. This is needed
1277 if your hardware includes a VFP unit.
1279 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1280 release notes and additional status information.
1282 Say N if your target does not have VFP hardware.
1290 bool "Advanced SIMD (NEON) Extension support"
1291 depends on VFPv3 && CPU_V7
1293 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1298 menu "Userspace binary formats"
1300 source "fs/Kconfig.binfmt"
1303 tristate "RISC OS personality"
1306 Say Y here to include the kernel code necessary if you want to run
1307 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1308 experimental; if this sounds frightening, say N and sleep in peace.
1309 You can also say M here to compile this support as a module (which
1310 will be called arthur).
1314 menu "Power management options"
1316 source "kernel/power/Kconfig"
1318 config ARCH_SUSPEND_POSSIBLE
1323 source "net/Kconfig"
1325 menu "Device Drivers"
1327 source "drivers/base/Kconfig"
1329 source "drivers/connector/Kconfig"
1331 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1332 source "drivers/mtd/Kconfig"
1335 source "drivers/parport/Kconfig"
1337 source "drivers/pnp/Kconfig"
1339 source "drivers/block/Kconfig"
1341 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1343 source "drivers/misc/Kconfig"
1345 source "drivers/ide/Kconfig"
1347 source "drivers/scsi/Kconfig"
1349 source "drivers/ata/Kconfig"
1351 source "drivers/md/Kconfig"
1353 source "drivers/message/fusion/Kconfig"
1355 source "drivers/ieee1394/Kconfig"
1357 source "drivers/message/i2o/Kconfig"
1359 source "drivers/net/Kconfig"
1361 source "drivers/isdn/Kconfig"
1363 # input before char - char/joystick depends on it. As does USB.
1365 source "drivers/input/Kconfig"
1367 source "drivers/char/Kconfig"
1369 source "drivers/i2c/Kconfig"
1371 source "drivers/spi/Kconfig"
1373 source "drivers/gpio/Kconfig"
1375 source "drivers/w1/Kconfig"
1377 source "drivers/power/Kconfig"
1379 source "drivers/hwmon/Kconfig"
1381 source "drivers/thermal/Kconfig"
1383 source "drivers/watchdog/Kconfig"
1385 source "drivers/ssb/Kconfig"
1387 #source "drivers/l3/Kconfig"
1389 source "drivers/mfd/Kconfig"
1391 source "drivers/media/Kconfig"
1393 source "drivers/video/Kconfig"
1395 source "sound/Kconfig"
1397 source "drivers/hid/Kconfig"
1399 source "drivers/usb/Kconfig"
1401 source "drivers/uwb/Kconfig"
1403 source "drivers/mmc/Kconfig"
1405 source "drivers/memstick/Kconfig"
1407 source "drivers/accessibility/Kconfig"
1409 source "drivers/leds/Kconfig"
1411 source "drivers/rtc/Kconfig"
1413 source "drivers/dma/Kconfig"
1415 source "drivers/dca/Kconfig"
1417 source "drivers/auxdisplay/Kconfig"
1419 source "drivers/regulator/Kconfig"
1421 source "drivers/uio/Kconfig"
1423 source "drivers/staging/Kconfig"
1429 source "arch/arm/Kconfig.debug"
1431 source "security/Kconfig"
1433 source "crypto/Kconfig"
1435 source "lib/Kconfig"