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
276 select ARCH_HAS_HOLES_MEMORYMODEL
278 This enables support for the Cirrus EP93xx series of CPUs.
281 bool "Cortina Systems Gemini"
284 select ARCH_REQUIRE_GPIOLIB
286 Support for the Cortina Systems Gemini family SoCs
288 config ARCH_FOOTBRIDGE
293 Support for systems based on the DC21285 companion chip
294 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
297 bool "Hilscher NetX based"
300 select GENERIC_CLOCKEVENTS
303 This enables support for systems based on the Hilscher NetX Soc
306 bool "Hynix HMS720x-based"
310 This enables support for systems based on the Hynix HMS720x
317 select GENERIC_CLOCKEVENTS
319 Support for Motorola's i.MX family of processors (MX1, MXL).
327 select ARCH_SUPPORTS_MSI
330 Support for Intel's IOP13XX (XScale) family of processors.
339 select ARCH_REQUIRE_GPIOLIB
341 Support for Intel's 80219 and IOP32X (XScale) family of
351 select ARCH_REQUIRE_GPIOLIB
353 Support for Intel's IOP33X (XScale) family of processors.
361 Support for Intel's IXP23xx (XScale) family of processors.
364 bool "IXP2400/2800-based"
369 Support for Intel's IXP2400/2800 (XScale) family of processors.
377 select GENERIC_CLOCKEVENTS
378 select DMABOUNCE if PCI
380 Support for Intel's IXP4XX (XScale) family of processors.
387 Say Y here if you intend to run this kernel on a LinkUp Systems
388 L7200 Software Development Board which uses an ARM720T processor.
389 Information on this board can be obtained at:
391 <http://www.linkupsys.com/>
393 If you have any questions or comments about the Linux kernel port
394 to this board, send e-mail to <sjhill@cotw.com>.
397 bool "Marvell Kirkwood"
402 select GENERIC_CLOCKEVENTS
405 Support for the following Marvell Kirkwood series SoCs:
406 88F6180, 88F6192 and 88F6281.
409 bool "Micrel/Kendin KS8695"
412 select ARCH_REQUIRE_GPIOLIB
414 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
415 System-on-Chip devices.
418 bool "NetSilicon NS9xxx"
422 select GENERIC_CLOCKEVENTS
425 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
428 <http://www.digi.com/products/microprocessors/index.jsp>
431 bool "Marvell Loki (88RC8480)"
434 select GENERIC_CLOCKEVENTS
437 Support for the Marvell Loki (88RC8480) SoC.
440 bool "Marvell MV78xx0"
445 select GENERIC_CLOCKEVENTS
448 Support for the following Marvell MV78xx0 series SoCs:
452 bool "Freescale MXC/iMX-based"
454 select GENERIC_CLOCKEVENTS
457 select ARCH_REQUIRE_GPIOLIB
460 Support for Freescale MXC/iMX-based family of processors
469 select GENERIC_CLOCKEVENTS
472 Support for the following Marvell Orion 5x series SoCs:
473 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
474 Orion-2 (5281), Orion-1-90 (6183).
477 bool "Philips Nexperia PNX4008 Mobile"
481 This enables support for Philips PNX4008 mobile platform.
484 bool "PXA2xx/PXA3xx-based"
490 select ARCH_REQUIRE_GPIOLIB
492 select GENERIC_CLOCKEVENTS
496 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
499 bool "Marvell PXA168/910"
502 select ARCH_REQUIRE_GPIOLIB
506 select GENERIC_CLOCKEVENTS
510 Support for Marvell's PXA168/910 processor line.
517 select ARCH_MAY_HAVE_PC_FDC
518 select HAVE_PATA_PLATFORM
521 select ARCH_SPARSEMEM_ENABLE
523 On the Acorn Risc-PC, Linux can support the internal IDE disk and
524 CD-ROM interface, serial and parallel port, and the floppy drive.
530 select ARCH_SPARSEMEM_ENABLE
534 select GENERIC_CLOCKEVENTS
537 select ARCH_REQUIRE_GPIOLIB
539 Support for StrongARM 11x0 based boards.
542 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
546 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
547 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
548 the Samsung SMDK2410 development board (and derivatives).
551 bool "Samsung S3C64XX"
555 Samsung S3C64XX series based systems
565 Support for the StrongARM based Digital DNARD machine, also known
566 as "Shark" (<http://www.shark-linux.de/shark.html>).
571 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
572 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
574 Say Y here for systems based on one of the Sharp LH7A40X
575 System on a Chip processors. These CPUs include an ARM922T
576 core with a wide array of integrated devices for
577 hand-held and low-power applications.
583 select GENERIC_CLOCKEVENTS
585 select ARCH_REQUIRE_GPIOLIB
591 Support for TI's DaVinci platform.
597 select ARCH_REQUIRE_GPIOLIB
599 select GENERIC_CLOCKEVENTS
601 Support for TI's OMAP platform (OMAP1 and OMAP2).
607 select GENERIC_CLOCKEVENTS
609 Support for Qualcomm MSM7K based systems. This runs on the ARM11
610 apps processor of the MSM7K and depends on a shared memory
611 interface to the ARM9 modem processor which runs the baseband stack
612 and controls some vital subsystems (clock and power control, etc).
615 bool "Nuvoton W90X900 CPU"
618 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
619 can login www.mcuos.com or www.nuvoton.com to know more.
623 source "arch/arm/mach-clps711x/Kconfig"
625 source "arch/arm/mach-ep93xx/Kconfig"
627 source "arch/arm/mach-footbridge/Kconfig"
629 source "arch/arm/mach-gemini/Kconfig"
631 source "arch/arm/mach-integrator/Kconfig"
633 source "arch/arm/mach-iop32x/Kconfig"
635 source "arch/arm/mach-iop33x/Kconfig"
637 source "arch/arm/mach-iop13xx/Kconfig"
639 source "arch/arm/mach-ixp4xx/Kconfig"
641 source "arch/arm/mach-ixp2000/Kconfig"
643 source "arch/arm/mach-ixp23xx/Kconfig"
645 source "arch/arm/mach-loki/Kconfig"
647 source "arch/arm/mach-mv78xx0/Kconfig"
649 source "arch/arm/mach-pxa/Kconfig"
650 source "arch/arm/plat-pxa/Kconfig"
652 source "arch/arm/mach-mmp/Kconfig"
654 source "arch/arm/mach-sa1100/Kconfig"
656 source "arch/arm/plat-omap/Kconfig"
658 source "arch/arm/mach-omap1/Kconfig"
660 source "arch/arm/mach-omap2/Kconfig"
662 source "arch/arm/mach-orion5x/Kconfig"
664 source "arch/arm/mach-kirkwood/Kconfig"
666 source "arch/arm/plat-s3c24xx/Kconfig"
667 source "arch/arm/plat-s3c64xx/Kconfig"
668 source "arch/arm/plat-s3c/Kconfig"
671 source "arch/arm/mach-s3c2400/Kconfig"
672 source "arch/arm/mach-s3c2410/Kconfig"
673 source "arch/arm/mach-s3c2412/Kconfig"
674 source "arch/arm/mach-s3c2440/Kconfig"
675 source "arch/arm/mach-s3c2442/Kconfig"
676 source "arch/arm/mach-s3c2443/Kconfig"
680 source "arch/arm/mach-s3c6400/Kconfig"
681 source "arch/arm/mach-s3c6410/Kconfig"
684 source "arch/arm/mach-lh7a40x/Kconfig"
686 source "arch/arm/mach-imx/Kconfig"
688 source "arch/arm/mach-h720x/Kconfig"
690 source "arch/arm/mach-versatile/Kconfig"
692 source "arch/arm/mach-aaec2000/Kconfig"
694 source "arch/arm/mach-realview/Kconfig"
696 source "arch/arm/mach-at91/Kconfig"
698 source "arch/arm/plat-mxc/Kconfig"
700 source "arch/arm/mach-netx/Kconfig"
702 source "arch/arm/mach-ns9xxx/Kconfig"
704 source "arch/arm/mach-davinci/Kconfig"
706 source "arch/arm/mach-ks8695/Kconfig"
708 source "arch/arm/mach-msm/Kconfig"
710 source "arch/arm/mach-w90x900/Kconfig"
712 # Definitions to make life easier
725 source arch/arm/mm/Kconfig
728 bool "Enable iWMMXt support"
729 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
730 default y if PXA27x || PXA3xx || ARCH_MMP
732 Enable support for iWMMXt context switching at run time if
733 running on a CPU that supports it.
735 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
738 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
742 source "arch/arm/Kconfig-nommu"
745 config ARM_ERRATA_411920
746 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
747 depends on CPU_V6 && !SMP
749 Invalidation of the Instruction Cache operation can
750 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
751 It does not affect the MPCore. This option enables the ARM Ltd.
752 recommended workaround.
754 config ARM_ERRATA_430973
755 bool "ARM errata: Stale prediction on replaced interworking branch"
758 This option enables the workaround for the 430973 Cortex-A8
759 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
760 interworking branch is replaced with another code sequence at the
761 same virtual address, whether due to self-modifying code or virtual
762 to physical address re-mapping, Cortex-A8 does not recover from the
763 stale interworking branch prediction. This results in Cortex-A8
764 executing the new code sequence in the incorrect ARM or Thumb state.
765 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
766 and also flushes the branch target cache at every context switch.
767 Note that setting specific bits in the ACTLR register may not be
768 available in non-secure mode.
770 config ARM_ERRATA_458693
771 bool "ARM errata: Processor deadlock when a false hazard is created"
774 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
775 erratum. For very specific sequences of memory operations, it is
776 possible for a hazard condition intended for a cache line to instead
777 be incorrectly associated with a different cache line. This false
778 hazard might then cause a processor deadlock. The workaround enables
779 the L1 caching of the NEON accesses and disables the PLD instruction
780 in the ACTLR register. Note that setting specific bits in the ACTLR
781 register may not be available in non-secure mode.
783 config ARM_ERRATA_460075
784 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
787 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
788 erratum. Any asynchronous access to the L2 cache may encounter a
789 situation in which recent store transactions to the L2 cache are lost
790 and overwritten with stale memory contents from external memory. The
791 workaround disables the write-allocate mode for the L2 cache via the
792 ACTLR register. Note that setting specific bits in the ACTLR register
793 may not be available in non-secure mode.
797 source "arch/arm/common/Kconfig"
799 config FORCE_MAX_ZONEORDER
812 Find out whether you have ISA slots on your motherboard. ISA is the
813 name of a bus system, i.e. the way the CPU talks to the other stuff
814 inside your box. Other bus systems are PCI, EISA, MicroChannel
815 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
816 newer boards don't support it. If you have ISA, say Y, otherwise N.
818 # Select ISA DMA controller support
823 # Select ISA DMA interface
828 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
830 Find out whether you have a PCI motherboard. PCI is the name of a
831 bus system, i.e. the way the CPU talks to the other stuff inside
832 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
833 VESA. If you have PCI, say Y, otherwise N.
838 # Select the host bridge type
839 config PCI_HOST_VIA82C505
841 depends on PCI && ARCH_SHARK
844 config PCI_HOST_ITE8152
846 depends on PCI && MACH_ARMCORE
850 source "drivers/pci/Kconfig"
852 source "drivers/pcmcia/Kconfig"
856 menu "Kernel Features"
858 source "kernel/time/Kconfig"
861 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
862 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
863 select USE_GENERIC_SMP_HELPERS
865 This enables support for systems with more than one CPU. If you have
866 a system with only one CPU, like most personal computers, say N. If
867 you have a system with more than one CPU, say Y.
869 If you say N here, the kernel will run on single and multiprocessor
870 machines, but will use only one CPU of a multiprocessor machine. If
871 you say Y here, the kernel will run on many, but not all, single
872 processor machines. On a single processor machine, the kernel will
873 run faster if you say N here.
875 See also <file:Documentation/i386/IO-APIC.txt>,
876 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
877 <http://www.linuxdoc.org/docs.html#howto>.
879 If you don't know what to do here, say N.
882 prompt "Memory split"
885 Select the desired split between kernel and user memory.
887 If you are not absolutely sure what you are doing, leave this
891 bool "3G/1G user/kernel split"
893 bool "2G/2G user/kernel split"
895 bool "1G/3G user/kernel split"
900 default 0x40000000 if VMSPLIT_1G
901 default 0x80000000 if VMSPLIT_2G
905 int "Maximum number of CPUs (2-32)"
911 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
912 depends on SMP && HOTPLUG && EXPERIMENTAL
914 Say Y here to experiment with turning CPUs off and on. CPUs
915 can be controlled through /sys/devices/system/cpu.
918 bool "Use local timer interrupts"
919 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
922 Enable support for local timers on SMP platforms, rather then the
923 legacy IPI broadcast method. Local timers allows the system
924 accounting to be spread across the timer interval, preventing a
925 "thundering herd" at every timer tick.
928 bool "Preemptible Kernel (EXPERIMENTAL)"
929 depends on EXPERIMENTAL
931 This option reduces the latency of the kernel when reacting to
932 real-time or interactive events by allowing a low priority process to
933 be preempted even if it is in kernel mode executing a system call.
934 This allows applications to run more reliably even when the system is
937 Say Y here if you are building a kernel for a desktop, embedded
938 or real-time system. Say N if you are unsure.
942 default 128 if ARCH_L7200
943 default 200 if ARCH_EBSA110 || ARCH_S3C2410
944 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
945 default AT91_TIMER_HZ if ARCH_AT91
949 bool "Use the ARM EABI to compile the kernel"
951 This option allows for the kernel to be compiled using the latest
952 ARM ABI (aka EABI). This is only useful if you are using a user
953 space environment that is also compiled with EABI.
955 Since there are major incompatibilities between the legacy ABI and
956 EABI, especially with regard to structure member alignment, this
957 option also changes the kernel syscall calling convention to
958 disambiguate both ABIs and allow for backward compatibility support
959 (selected with CONFIG_OABI_COMPAT).
961 To use this you need GCC version 4.0.0 or later.
964 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
965 depends on AEABI && EXPERIMENTAL
968 This option preserves the old syscall interface along with the
969 new (ARM EABI) one. It also provides a compatibility layer to
970 intercept syscalls that have structure arguments which layout
971 in memory differs between the legacy ABI and the new ARM EABI
972 (only for non "thumb" binaries). This option adds a tiny
973 overhead to all syscalls and produces a slightly larger kernel.
974 If you know you'll be using only pure EABI user space then you
975 can say N here. If this option is not selected and you attempt
976 to execute a legacy ABI binary then the result will be
977 UNPREDICTABLE (in fact it can be predicted that it won't work
978 at all). If in doubt say Y.
980 config ARCH_HAS_HOLES_MEMORYMODEL
984 # Discontigmem is deprecated
985 config ARCH_DISCONTIGMEM_ENABLE
988 config ARCH_SPARSEMEM_ENABLE
991 config ARCH_SPARSEMEM_DEFAULT
992 def_bool ARCH_SPARSEMEM_ENABLE
994 config ARCH_SELECT_MEMORY_MODEL
995 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
999 default "4" if ARCH_LH7A40X
1001 depends on NEED_MULTIPLE_NODES
1004 bool "High Memory Support (EXPERIMENTAL)"
1005 depends on MMU && EXPERIMENTAL
1007 The address space of ARM processors is only 4 Gigabytes large
1008 and it has to accommodate user address space, kernel address
1009 space as well as some memory mapped IO. That means that, if you
1010 have a large amount of physical memory and/or IO, not all of the
1011 memory can be "permanently mapped" by the kernel. The physical
1012 memory that is not permanently mapped is called "high memory".
1014 Depending on the selected kernel/user memory split, minimum
1015 vmalloc space and actual amount of RAM, you may not need this
1016 option which should result in a slightly faster kernel.
1023 bool "Timer and CPU usage LEDs"
1024 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1025 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
1026 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1027 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1028 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1029 ARCH_AT91 || ARCH_DAVINCI || \
1030 ARCH_KS8695 || MACH_RD88F5182
1032 If you say Y here, the LEDs on your machine will be used
1033 to provide useful information about your current system status.
1035 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1036 be able to select which LEDs are active using the options below. If
1037 you are compiling a kernel for the EBSA-110 or the LART however, the
1038 red LED will simply flash regularly to indicate that the system is
1039 still functional. It is safe to say Y here if you have a CATS
1040 system, but the driver will do nothing.
1043 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1044 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1045 || MACH_OMAP_PERSEUS2
1047 depends on !GENERIC_CLOCKEVENTS
1048 default y if ARCH_EBSA110
1050 If you say Y here, one of the system LEDs (the green one on the
1051 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1052 will flash regularly to indicate that the system is still
1053 operational. This is mainly useful to kernel hackers who are
1054 debugging unstable kernels.
1056 The LART uses the same LED for both Timer LED and CPU usage LED
1057 functions. You may choose to use both, but the Timer LED function
1058 will overrule the CPU usage LED.
1061 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1063 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1064 || MACH_OMAP_PERSEUS2
1067 If you say Y here, the red LED will be used to give a good real
1068 time indication of CPU usage, by lighting whenever the idle task
1069 is not currently executing.
1071 The LART uses the same LED for both Timer LED and CPU usage LED
1072 functions. You may choose to use both, but the Timer LED function
1073 will overrule the CPU usage LED.
1075 config ALIGNMENT_TRAP
1077 depends on CPU_CP15_MMU
1078 default y if !ARCH_EBSA110
1080 ARM processors cannot fetch/store information which is not
1081 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1082 address divisible by 4. On 32-bit ARM processors, these non-aligned
1083 fetch/store instructions will be emulated in software if you say
1084 here, which has a severe performance impact. This is necessary for
1085 correct operation of some network protocols. With an IP-only
1086 configuration it is safe to say N, otherwise say Y.
1092 # Compressed boot loader in ROM. Yes, we really want to ask about
1093 # TEXT and BSS so we preserve their values in the config files.
1094 config ZBOOT_ROM_TEXT
1095 hex "Compressed ROM boot loader base address"
1098 The physical address at which the ROM-able zImage is to be
1099 placed in the target. Platforms which normally make use of
1100 ROM-able zImage formats normally set this to a suitable
1101 value in their defconfig file.
1103 If ZBOOT_ROM is not enabled, this has no effect.
1105 config ZBOOT_ROM_BSS
1106 hex "Compressed ROM boot loader BSS address"
1109 The base address of an area of read/write memory in the target
1110 for the ROM-able zImage which must be available while the
1111 decompressor is running. It must be large enough to hold the
1112 entire decompressed kernel plus an additional 128 KiB.
1113 Platforms which normally make use of ROM-able zImage formats
1114 normally set this to a suitable value in their defconfig file.
1116 If ZBOOT_ROM is not enabled, this has no effect.
1119 bool "Compressed boot loader in ROM/flash"
1120 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1122 Say Y here if you intend to execute your compressed kernel image
1123 (zImage) directly from ROM or flash. If unsure, say N.
1126 string "Default kernel command string"
1129 On some architectures (EBSA110 and CATS), there is currently no way
1130 for the boot loader to pass arguments to the kernel. For these
1131 architectures, you should supply some command-line options at build
1132 time by entering them here. As a minimum, you should specify the
1133 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1136 bool "Kernel Execute-In-Place from ROM"
1137 depends on !ZBOOT_ROM
1139 Execute-In-Place allows the kernel to run from non-volatile storage
1140 directly addressable by the CPU, such as NOR flash. This saves RAM
1141 space since the text section of the kernel is not loaded from flash
1142 to RAM. Read-write sections, such as the data section and stack,
1143 are still copied to RAM. The XIP kernel is not compressed since
1144 it has to run directly from flash, so it will take more space to
1145 store it. The flash address used to link the kernel object files,
1146 and for storing it, is configuration dependent. Therefore, if you
1147 say Y here, you must know the proper physical address where to
1148 store the kernel image depending on your own flash memory usage.
1150 Also note that the make target becomes "make xipImage" rather than
1151 "make zImage" or "make Image". The final kernel binary to put in
1152 ROM memory will be arch/arm/boot/xipImage.
1156 config XIP_PHYS_ADDR
1157 hex "XIP Kernel Physical Location"
1158 depends on XIP_KERNEL
1159 default "0x00080000"
1161 This is the physical address in your flash memory the kernel will
1162 be linked for and stored to. This address is dependent on your
1166 bool "Kexec system call (EXPERIMENTAL)"
1167 depends on EXPERIMENTAL
1169 kexec is a system call that implements the ability to shutdown your
1170 current kernel, and to start another kernel. It is like a reboot
1171 but it is independent of the system firmware. And like a reboot
1172 you can start any kernel with it, not just Linux.
1174 It is an ongoing process to be certain the hardware in a machine
1175 is properly shutdown, so do not be surprised if this code does not
1176 initially work for you. It may help to enable device hotplugging
1180 bool "Export atags in procfs"
1184 Should the atags used to boot the kernel be exported in an "atags"
1185 file in procfs. Useful with kexec.
1189 menu "CPU Power Management"
1191 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1193 source "drivers/cpufreq/Kconfig"
1195 config CPU_FREQ_SA1100
1197 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1200 config CPU_FREQ_SA1110
1202 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1205 config CPU_FREQ_INTEGRATOR
1206 tristate "CPUfreq driver for ARM Integrator CPUs"
1207 depends on ARCH_INTEGRATOR && CPU_FREQ
1210 This enables the CPUfreq driver for ARM Integrator CPUs.
1212 For details, take a look at <file:Documentation/cpu-freq>.
1217 tristate "CPUfreq driver for i.MX CPUs"
1218 depends on ARCH_IMX && CPU_FREQ
1221 This enables the CPUfreq driver for i.MX CPUs.
1227 source "drivers/cpuidle/Kconfig"
1231 menu "Floating point emulation"
1233 comment "At least one emulation must be selected"
1236 bool "NWFPE math emulation"
1237 depends on !AEABI || OABI_COMPAT
1239 Say Y to include the NWFPE floating point emulator in the kernel.
1240 This is necessary to run most binaries. Linux does not currently
1241 support floating point hardware so you need to say Y here even if
1242 your machine has an FPA or floating point co-processor podule.
1244 You may say N here if you are going to load the Acorn FPEmulator
1245 early in the bootup.
1248 bool "Support extended precision"
1249 depends on FPE_NWFPE
1251 Say Y to include 80-bit support in the kernel floating-point
1252 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1253 Note that gcc does not generate 80-bit operations by default,
1254 so in most cases this option only enlarges the size of the
1255 floating point emulator without any good reason.
1257 You almost surely want to say N here.
1260 bool "FastFPE math emulation (EXPERIMENTAL)"
1261 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1263 Say Y here to include the FAST floating point emulator in the kernel.
1264 This is an experimental much faster emulator which now also has full
1265 precision for the mantissa. It does not support any exceptions.
1266 It is very simple, and approximately 3-6 times faster than NWFPE.
1268 It should be sufficient for most programs. It may be not suitable
1269 for scientific calculations, but you have to check this for yourself.
1270 If you do not feel you need a faster FP emulation you should better
1274 bool "VFP-format floating point maths"
1275 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1277 Say Y to include VFP support code in the kernel. This is needed
1278 if your hardware includes a VFP unit.
1280 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1281 release notes and additional status information.
1283 Say N if your target does not have VFP hardware.
1291 bool "Advanced SIMD (NEON) Extension support"
1292 depends on VFPv3 && CPU_V7
1294 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1299 menu "Userspace binary formats"
1301 source "fs/Kconfig.binfmt"
1304 tristate "RISC OS personality"
1307 Say Y here to include the kernel code necessary if you want to run
1308 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1309 experimental; if this sounds frightening, say N and sleep in peace.
1310 You can also say M here to compile this support as a module (which
1311 will be called arthur).
1315 menu "Power management options"
1317 source "kernel/power/Kconfig"
1319 config ARCH_SUSPEND_POSSIBLE
1324 source "net/Kconfig"
1326 menu "Device Drivers"
1328 source "drivers/base/Kconfig"
1330 source "drivers/connector/Kconfig"
1332 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1333 source "drivers/mtd/Kconfig"
1336 source "drivers/parport/Kconfig"
1338 source "drivers/pnp/Kconfig"
1340 source "drivers/block/Kconfig"
1342 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1344 source "drivers/misc/Kconfig"
1346 source "drivers/ide/Kconfig"
1348 source "drivers/scsi/Kconfig"
1350 source "drivers/ata/Kconfig"
1352 source "drivers/md/Kconfig"
1354 source "drivers/message/fusion/Kconfig"
1356 source "drivers/ieee1394/Kconfig"
1358 source "drivers/message/i2o/Kconfig"
1360 source "drivers/net/Kconfig"
1362 source "drivers/isdn/Kconfig"
1364 # input before char - char/joystick depends on it. As does USB.
1366 source "drivers/input/Kconfig"
1368 source "drivers/char/Kconfig"
1370 source "drivers/i2c/Kconfig"
1372 source "drivers/spi/Kconfig"
1374 source "drivers/gpio/Kconfig"
1376 source "drivers/w1/Kconfig"
1378 source "drivers/power/Kconfig"
1380 source "drivers/hwmon/Kconfig"
1382 source "drivers/thermal/Kconfig"
1384 source "drivers/watchdog/Kconfig"
1386 source "drivers/ssb/Kconfig"
1388 #source "drivers/l3/Kconfig"
1390 source "drivers/mfd/Kconfig"
1392 source "drivers/media/Kconfig"
1394 source "drivers/video/Kconfig"
1396 source "sound/Kconfig"
1398 source "drivers/hid/Kconfig"
1400 source "drivers/usb/Kconfig"
1402 source "drivers/uwb/Kconfig"
1404 source "drivers/mmc/Kconfig"
1406 source "drivers/memstick/Kconfig"
1408 source "drivers/accessibility/Kconfig"
1410 source "drivers/leds/Kconfig"
1412 source "drivers/rtc/Kconfig"
1414 source "drivers/dma/Kconfig"
1416 source "drivers/dca/Kconfig"
1418 source "drivers/auxdisplay/Kconfig"
1420 source "drivers/regulator/Kconfig"
1422 source "drivers/uio/Kconfig"
1424 source "drivers/staging/Kconfig"
1430 source "arch/arm/Kconfig.debug"
1432 source "security/Kconfig"
1434 source "crypto/Kconfig"
1436 source "lib/Kconfig"