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.
257 bool "Cortina Systems Gemini"
260 select ARCH_REQUIRE_GPIOLIB
262 Support for the Cortina Systems Gemini family SoCs
270 This is an evaluation board for the StrongARM processor available
271 from Digital. It has limited hardware on-board, including an
272 Ethernet interface, two PCMCIA sockets, two serial ports and a
283 select ARCH_REQUIRE_GPIOLIB
285 This enables support for the Cirrus EP93xx series of CPUs.
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 "Freescale MXC/iMX-based"
298 select GENERIC_CLOCKEVENTS
301 select ARCH_REQUIRE_GPIOLIB
304 Support for Freescale MXC/iMX-based family of processors
307 bool "Hilscher NetX based"
310 select GENERIC_CLOCKEVENTS
313 This enables support for systems based on the Hilscher NetX Soc
316 bool "Hynix HMS720x-based"
320 This enables support for systems based on the Hynix HMS720x
328 select ARCH_SUPPORTS_MSI
331 Support for Intel's IOP13XX (XScale) family of processors.
340 select ARCH_REQUIRE_GPIOLIB
342 Support for Intel's 80219 and IOP32X (XScale) family of
352 select ARCH_REQUIRE_GPIOLIB
354 Support for Intel's IOP33X (XScale) family of processors.
362 Support for Intel's IXP23xx (XScale) family of processors.
365 bool "IXP2400/2800-based"
370 Support for Intel's IXP2400/2800 (XScale) family of processors.
378 select GENERIC_CLOCKEVENTS
379 select DMABOUNCE if PCI
381 Support for Intel's IXP4XX (XScale) family of processors.
388 Say Y here if you intend to run this kernel on a LinkUp Systems
389 L7200 Software Development Board which uses an ARM720T processor.
390 Information on this board can be obtained at:
392 <http://www.linkupsys.com/>
394 If you have any questions or comments about the Linux kernel port
395 to this board, send e-mail to <sjhill@cotw.com>.
398 bool "Marvell Kirkwood"
403 select GENERIC_CLOCKEVENTS
406 Support for the following Marvell Kirkwood series SoCs:
407 88F6180, 88F6192 and 88F6281.
410 bool "Marvell Loki (88RC8480)"
413 select GENERIC_CLOCKEVENTS
416 Support for the Marvell Loki (88RC8480) SoC.
419 bool "Marvell MV78xx0"
424 select GENERIC_CLOCKEVENTS
427 Support for the following Marvell MV78xx0 series SoCs:
437 select GENERIC_CLOCKEVENTS
440 Support for the following Marvell Orion 5x series SoCs:
441 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
442 Orion-2 (5281), Orion-1-90 (6183).
445 bool "Marvell PXA168/910"
448 select ARCH_REQUIRE_GPIOLIB
452 select GENERIC_CLOCKEVENTS
456 Support for Marvell's PXA168/910 processor line.
459 bool "Micrel/Kendin KS8695"
462 select ARCH_REQUIRE_GPIOLIB
464 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
465 System-on-Chip devices.
468 bool "NetSilicon NS9xxx"
472 select GENERIC_CLOCKEVENTS
475 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
478 <http://www.digi.com/products/microprocessors/index.jsp>
481 bool "Nuvoton W90X900 CPU"
484 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
485 can login www.mcuos.com or www.nuvoton.com to know more.
488 bool "Philips Nexperia PNX4008 Mobile"
492 This enables support for Philips PNX4008 mobile platform.
495 bool "PXA2xx/PXA3xx-based"
501 select ARCH_REQUIRE_GPIOLIB
503 select GENERIC_CLOCKEVENTS
507 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
513 select GENERIC_CLOCKEVENTS
515 Support for Qualcomm MSM7K based systems. This runs on the ARM11
516 apps processor of the MSM7K and depends on a shared memory
517 interface to the ARM9 modem processor which runs the baseband stack
518 and controls some vital subsystems (clock and power control, etc).
525 select ARCH_MAY_HAVE_PC_FDC
526 select HAVE_PATA_PLATFORM
529 select ARCH_SPARSEMEM_ENABLE
531 On the Acorn Risc-PC, Linux can support the internal IDE disk and
532 CD-ROM interface, serial and parallel port, and the floppy drive.
538 select ARCH_SPARSEMEM_ENABLE
542 select GENERIC_CLOCKEVENTS
545 select ARCH_REQUIRE_GPIOLIB
547 Support for StrongARM 11x0 based boards.
550 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
554 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
555 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
556 the Samsung SMDK2410 development board (and derivatives).
559 bool "Samsung S3C64XX"
563 Samsung S3C64XX series based systems
573 Support for the StrongARM based Digital DNARD machine, also known
574 as "Shark" (<http://www.shark-linux.de/shark.html>).
579 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
580 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
582 Say Y here for systems based on one of the Sharp LH7A40X
583 System on a Chip processors. These CPUs include an ARM922T
584 core with a wide array of integrated devices for
585 hand-held and low-power applications.
591 select GENERIC_CLOCKEVENTS
593 select ARCH_REQUIRE_GPIOLIB
599 Support for TI's DaVinci platform.
605 select ARCH_REQUIRE_GPIOLIB
607 select GENERIC_CLOCKEVENTS
609 Support for TI's OMAP platform (OMAP1 and OMAP2).
613 source "arch/arm/mach-clps711x/Kconfig"
615 source "arch/arm/mach-ep93xx/Kconfig"
617 source "arch/arm/mach-footbridge/Kconfig"
619 source "arch/arm/mach-gemini/Kconfig"
621 source "arch/arm/mach-integrator/Kconfig"
623 source "arch/arm/mach-iop32x/Kconfig"
625 source "arch/arm/mach-iop33x/Kconfig"
627 source "arch/arm/mach-iop13xx/Kconfig"
629 source "arch/arm/mach-ixp4xx/Kconfig"
631 source "arch/arm/mach-ixp2000/Kconfig"
633 source "arch/arm/mach-ixp23xx/Kconfig"
635 source "arch/arm/mach-loki/Kconfig"
637 source "arch/arm/mach-mv78xx0/Kconfig"
639 source "arch/arm/mach-pxa/Kconfig"
640 source "arch/arm/plat-pxa/Kconfig"
642 source "arch/arm/mach-mmp/Kconfig"
644 source "arch/arm/mach-sa1100/Kconfig"
646 source "arch/arm/plat-omap/Kconfig"
648 source "arch/arm/mach-omap1/Kconfig"
650 source "arch/arm/mach-omap2/Kconfig"
652 source "arch/arm/mach-orion5x/Kconfig"
654 source "arch/arm/mach-kirkwood/Kconfig"
656 source "arch/arm/plat-s3c24xx/Kconfig"
657 source "arch/arm/plat-s3c64xx/Kconfig"
658 source "arch/arm/plat-s3c/Kconfig"
661 source "arch/arm/mach-s3c2400/Kconfig"
662 source "arch/arm/mach-s3c2410/Kconfig"
663 source "arch/arm/mach-s3c2412/Kconfig"
664 source "arch/arm/mach-s3c2440/Kconfig"
665 source "arch/arm/mach-s3c2442/Kconfig"
666 source "arch/arm/mach-s3c2443/Kconfig"
670 source "arch/arm/mach-s3c6400/Kconfig"
671 source "arch/arm/mach-s3c6410/Kconfig"
674 source "arch/arm/mach-lh7a40x/Kconfig"
676 source "arch/arm/mach-h720x/Kconfig"
678 source "arch/arm/mach-versatile/Kconfig"
680 source "arch/arm/mach-aaec2000/Kconfig"
682 source "arch/arm/mach-realview/Kconfig"
684 source "arch/arm/mach-at91/Kconfig"
686 source "arch/arm/plat-mxc/Kconfig"
688 source "arch/arm/mach-netx/Kconfig"
690 source "arch/arm/mach-ns9xxx/Kconfig"
692 source "arch/arm/mach-davinci/Kconfig"
694 source "arch/arm/mach-ks8695/Kconfig"
696 source "arch/arm/mach-msm/Kconfig"
698 source "arch/arm/mach-w90x900/Kconfig"
700 # Definitions to make life easier
713 source arch/arm/mm/Kconfig
716 bool "Enable iWMMXt support"
717 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
718 default y if PXA27x || PXA3xx || ARCH_MMP
720 Enable support for iWMMXt context switching at run time if
721 running on a CPU that supports it.
723 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
726 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
730 source "arch/arm/Kconfig-nommu"
733 config ARM_ERRATA_411920
734 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
735 depends on CPU_V6 && !SMP
737 Invalidation of the Instruction Cache operation can
738 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
739 It does not affect the MPCore. This option enables the ARM Ltd.
740 recommended workaround.
742 config ARM_ERRATA_430973
743 bool "ARM errata: Stale prediction on replaced interworking branch"
746 This option enables the workaround for the 430973 Cortex-A8
747 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
748 interworking branch is replaced with another code sequence at the
749 same virtual address, whether due to self-modifying code or virtual
750 to physical address re-mapping, Cortex-A8 does not recover from the
751 stale interworking branch prediction. This results in Cortex-A8
752 executing the new code sequence in the incorrect ARM or Thumb state.
753 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
754 and also flushes the branch target cache at every context switch.
755 Note that setting specific bits in the ACTLR register may not be
756 available in non-secure mode.
758 config ARM_ERRATA_458693
759 bool "ARM errata: Processor deadlock when a false hazard is created"
762 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
763 erratum. For very specific sequences of memory operations, it is
764 possible for a hazard condition intended for a cache line to instead
765 be incorrectly associated with a different cache line. This false
766 hazard might then cause a processor deadlock. The workaround enables
767 the L1 caching of the NEON accesses and disables the PLD instruction
768 in the ACTLR register. Note that setting specific bits in the ACTLR
769 register may not be available in non-secure mode.
771 config ARM_ERRATA_460075
772 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
775 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
776 erratum. Any asynchronous access to the L2 cache may encounter a
777 situation in which recent store transactions to the L2 cache are lost
778 and overwritten with stale memory contents from external memory. The
779 workaround disables the write-allocate mode for the L2 cache via the
780 ACTLR register. Note that setting specific bits in the ACTLR register
781 may not be available in non-secure mode.
785 source "arch/arm/common/Kconfig"
787 config FORCE_MAX_ZONEORDER
800 Find out whether you have ISA slots on your motherboard. ISA is the
801 name of a bus system, i.e. the way the CPU talks to the other stuff
802 inside your box. Other bus systems are PCI, EISA, MicroChannel
803 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
804 newer boards don't support it. If you have ISA, say Y, otherwise N.
806 # Select ISA DMA controller support
811 # Select ISA DMA interface
816 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
818 Find out whether you have a PCI motherboard. PCI is the name of a
819 bus system, i.e. the way the CPU talks to the other stuff inside
820 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
821 VESA. If you have PCI, say Y, otherwise N.
826 # Select the host bridge type
827 config PCI_HOST_VIA82C505
829 depends on PCI && ARCH_SHARK
832 config PCI_HOST_ITE8152
834 depends on PCI && MACH_ARMCORE
838 source "drivers/pci/Kconfig"
840 source "drivers/pcmcia/Kconfig"
844 menu "Kernel Features"
846 source "kernel/time/Kconfig"
849 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
850 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
851 select USE_GENERIC_SMP_HELPERS
853 This enables support for systems with more than one CPU. If you have
854 a system with only one CPU, like most personal computers, say N. If
855 you have a system with more than one CPU, say Y.
857 If you say N here, the kernel will run on single and multiprocessor
858 machines, but will use only one CPU of a multiprocessor machine. If
859 you say Y here, the kernel will run on many, but not all, single
860 processor machines. On a single processor machine, the kernel will
861 run faster if you say N here.
863 See also <file:Documentation/i386/IO-APIC.txt>,
864 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
865 <http://www.linuxdoc.org/docs.html#howto>.
867 If you don't know what to do here, say N.
870 prompt "Memory split"
873 Select the desired split between kernel and user memory.
875 If you are not absolutely sure what you are doing, leave this
879 bool "3G/1G user/kernel split"
881 bool "2G/2G user/kernel split"
883 bool "1G/3G user/kernel split"
888 default 0x40000000 if VMSPLIT_1G
889 default 0x80000000 if VMSPLIT_2G
893 int "Maximum number of CPUs (2-32)"
899 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
900 depends on SMP && HOTPLUG && EXPERIMENTAL
902 Say Y here to experiment with turning CPUs off and on. CPUs
903 can be controlled through /sys/devices/system/cpu.
906 bool "Use local timer interrupts"
907 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
910 Enable support for local timers on SMP platforms, rather then the
911 legacy IPI broadcast method. Local timers allows the system
912 accounting to be spread across the timer interval, preventing a
913 "thundering herd" at every timer tick.
916 bool "Preemptible Kernel (EXPERIMENTAL)"
917 depends on EXPERIMENTAL
919 This option reduces the latency of the kernel when reacting to
920 real-time or interactive events by allowing a low priority process to
921 be preempted even if it is in kernel mode executing a system call.
922 This allows applications to run more reliably even when the system is
925 Say Y here if you are building a kernel for a desktop, embedded
926 or real-time system. Say N if you are unsure.
930 default 128 if ARCH_L7200
931 default 200 if ARCH_EBSA110 || ARCH_S3C2410
932 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
933 default AT91_TIMER_HZ if ARCH_AT91
937 bool "Use the ARM EABI to compile the kernel"
939 This option allows for the kernel to be compiled using the latest
940 ARM ABI (aka EABI). This is only useful if you are using a user
941 space environment that is also compiled with EABI.
943 Since there are major incompatibilities between the legacy ABI and
944 EABI, especially with regard to structure member alignment, this
945 option also changes the kernel syscall calling convention to
946 disambiguate both ABIs and allow for backward compatibility support
947 (selected with CONFIG_OABI_COMPAT).
949 To use this you need GCC version 4.0.0 or later.
952 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
953 depends on AEABI && EXPERIMENTAL
956 This option preserves the old syscall interface along with the
957 new (ARM EABI) one. It also provides a compatibility layer to
958 intercept syscalls that have structure arguments which layout
959 in memory differs between the legacy ABI and the new ARM EABI
960 (only for non "thumb" binaries). This option adds a tiny
961 overhead to all syscalls and produces a slightly larger kernel.
962 If you know you'll be using only pure EABI user space then you
963 can say N here. If this option is not selected and you attempt
964 to execute a legacy ABI binary then the result will be
965 UNPREDICTABLE (in fact it can be predicted that it won't work
966 at all). If in doubt say Y.
968 config ARCH_FLATMEM_HAS_HOLES
973 # Discontigmem is deprecated
974 config ARCH_DISCONTIGMEM_ENABLE
977 config ARCH_SPARSEMEM_ENABLE
980 config ARCH_SPARSEMEM_DEFAULT
981 def_bool ARCH_SPARSEMEM_ENABLE
983 config ARCH_SELECT_MEMORY_MODEL
984 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
988 default "4" if ARCH_LH7A40X
990 depends on NEED_MULTIPLE_NODES
993 bool "High Memory Support (EXPERIMENTAL)"
994 depends on MMU && EXPERIMENTAL
996 The address space of ARM processors is only 4 Gigabytes large
997 and it has to accommodate user address space, kernel address
998 space as well as some memory mapped IO. That means that, if you
999 have a large amount of physical memory and/or IO, not all of the
1000 memory can be "permanently mapped" by the kernel. The physical
1001 memory that is not permanently mapped is called "high memory".
1003 Depending on the selected kernel/user memory split, minimum
1004 vmalloc space and actual amount of RAM, you may not need this
1005 option which should result in a slightly faster kernel.
1012 bool "Timer and CPU usage LEDs"
1013 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1014 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1015 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1016 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1017 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1018 ARCH_AT91 || ARCH_DAVINCI || \
1019 ARCH_KS8695 || MACH_RD88F5182
1021 If you say Y here, the LEDs on your machine will be used
1022 to provide useful information about your current system status.
1024 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1025 be able to select which LEDs are active using the options below. If
1026 you are compiling a kernel for the EBSA-110 or the LART however, the
1027 red LED will simply flash regularly to indicate that the system is
1028 still functional. It is safe to say Y here if you have a CATS
1029 system, but the driver will do nothing.
1032 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1033 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1034 || MACH_OMAP_PERSEUS2
1036 depends on !GENERIC_CLOCKEVENTS
1037 default y if ARCH_EBSA110
1039 If you say Y here, one of the system LEDs (the green one on the
1040 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1041 will flash regularly to indicate that the system is still
1042 operational. This is mainly useful to kernel hackers who are
1043 debugging unstable kernels.
1045 The LART uses the same LED for both Timer LED and CPU usage LED
1046 functions. You may choose to use both, but the Timer LED function
1047 will overrule the CPU usage LED.
1050 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1052 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1053 || MACH_OMAP_PERSEUS2
1056 If you say Y here, the red LED will be used to give a good real
1057 time indication of CPU usage, by lighting whenever the idle task
1058 is not currently executing.
1060 The LART uses the same LED for both Timer LED and CPU usage LED
1061 functions. You may choose to use both, but the Timer LED function
1062 will overrule the CPU usage LED.
1064 config ALIGNMENT_TRAP
1066 depends on CPU_CP15_MMU
1067 default y if !ARCH_EBSA110
1069 ARM processors cannot fetch/store information which is not
1070 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1071 address divisible by 4. On 32-bit ARM processors, these non-aligned
1072 fetch/store instructions will be emulated in software if you say
1073 here, which has a severe performance impact. This is necessary for
1074 correct operation of some network protocols. With an IP-only
1075 configuration it is safe to say N, otherwise say Y.
1081 # Compressed boot loader in ROM. Yes, we really want to ask about
1082 # TEXT and BSS so we preserve their values in the config files.
1083 config ZBOOT_ROM_TEXT
1084 hex "Compressed ROM boot loader base address"
1087 The physical address at which the ROM-able zImage is to be
1088 placed in the target. Platforms which normally make use of
1089 ROM-able zImage formats normally set this to a suitable
1090 value in their defconfig file.
1092 If ZBOOT_ROM is not enabled, this has no effect.
1094 config ZBOOT_ROM_BSS
1095 hex "Compressed ROM boot loader BSS address"
1098 The base address of an area of read/write memory in the target
1099 for the ROM-able zImage which must be available while the
1100 decompressor is running. It must be large enough to hold the
1101 entire decompressed kernel plus an additional 128 KiB.
1102 Platforms which normally make use of ROM-able zImage formats
1103 normally set this to a suitable value in their defconfig file.
1105 If ZBOOT_ROM is not enabled, this has no effect.
1108 bool "Compressed boot loader in ROM/flash"
1109 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1111 Say Y here if you intend to execute your compressed kernel image
1112 (zImage) directly from ROM or flash. If unsure, say N.
1115 string "Default kernel command string"
1118 On some architectures (EBSA110 and CATS), there is currently no way
1119 for the boot loader to pass arguments to the kernel. For these
1120 architectures, you should supply some command-line options at build
1121 time by entering them here. As a minimum, you should specify the
1122 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1125 bool "Kernel Execute-In-Place from ROM"
1126 depends on !ZBOOT_ROM
1128 Execute-In-Place allows the kernel to run from non-volatile storage
1129 directly addressable by the CPU, such as NOR flash. This saves RAM
1130 space since the text section of the kernel is not loaded from flash
1131 to RAM. Read-write sections, such as the data section and stack,
1132 are still copied to RAM. The XIP kernel is not compressed since
1133 it has to run directly from flash, so it will take more space to
1134 store it. The flash address used to link the kernel object files,
1135 and for storing it, is configuration dependent. Therefore, if you
1136 say Y here, you must know the proper physical address where to
1137 store the kernel image depending on your own flash memory usage.
1139 Also note that the make target becomes "make xipImage" rather than
1140 "make zImage" or "make Image". The final kernel binary to put in
1141 ROM memory will be arch/arm/boot/xipImage.
1145 config XIP_PHYS_ADDR
1146 hex "XIP Kernel Physical Location"
1147 depends on XIP_KERNEL
1148 default "0x00080000"
1150 This is the physical address in your flash memory the kernel will
1151 be linked for and stored to. This address is dependent on your
1155 bool "Kexec system call (EXPERIMENTAL)"
1156 depends on EXPERIMENTAL
1158 kexec is a system call that implements the ability to shutdown your
1159 current kernel, and to start another kernel. It is like a reboot
1160 but it is independent of the system firmware. And like a reboot
1161 you can start any kernel with it, not just Linux.
1163 It is an ongoing process to be certain the hardware in a machine
1164 is properly shutdown, so do not be surprised if this code does not
1165 initially work for you. It may help to enable device hotplugging
1169 bool "Export atags in procfs"
1173 Should the atags used to boot the kernel be exported in an "atags"
1174 file in procfs. Useful with kexec.
1178 menu "CPU Power Management"
1180 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA)
1182 source "drivers/cpufreq/Kconfig"
1184 config CPU_FREQ_SA1100
1186 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1189 config CPU_FREQ_SA1110
1191 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1194 config CPU_FREQ_INTEGRATOR
1195 tristate "CPUfreq driver for ARM Integrator CPUs"
1196 depends on ARCH_INTEGRATOR && CPU_FREQ
1199 This enables the CPUfreq driver for ARM Integrator CPUs.
1201 For details, take a look at <file:Documentation/cpu-freq>.
1207 depends on CPU_FREQ && ARCH_PXA && PXA25x
1209 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1213 source "drivers/cpuidle/Kconfig"
1217 menu "Floating point emulation"
1219 comment "At least one emulation must be selected"
1222 bool "NWFPE math emulation"
1223 depends on !AEABI || OABI_COMPAT
1225 Say Y to include the NWFPE floating point emulator in the kernel.
1226 This is necessary to run most binaries. Linux does not currently
1227 support floating point hardware so you need to say Y here even if
1228 your machine has an FPA or floating point co-processor podule.
1230 You may say N here if you are going to load the Acorn FPEmulator
1231 early in the bootup.
1234 bool "Support extended precision"
1235 depends on FPE_NWFPE
1237 Say Y to include 80-bit support in the kernel floating-point
1238 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1239 Note that gcc does not generate 80-bit operations by default,
1240 so in most cases this option only enlarges the size of the
1241 floating point emulator without any good reason.
1243 You almost surely want to say N here.
1246 bool "FastFPE math emulation (EXPERIMENTAL)"
1247 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1249 Say Y here to include the FAST floating point emulator in the kernel.
1250 This is an experimental much faster emulator which now also has full
1251 precision for the mantissa. It does not support any exceptions.
1252 It is very simple, and approximately 3-6 times faster than NWFPE.
1254 It should be sufficient for most programs. It may be not suitable
1255 for scientific calculations, but you have to check this for yourself.
1256 If you do not feel you need a faster FP emulation you should better
1260 bool "VFP-format floating point maths"
1261 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1263 Say Y to include VFP support code in the kernel. This is needed
1264 if your hardware includes a VFP unit.
1266 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1267 release notes and additional status information.
1269 Say N if your target does not have VFP hardware.
1277 bool "Advanced SIMD (NEON) Extension support"
1278 depends on VFPv3 && CPU_V7
1280 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1285 menu "Userspace binary formats"
1287 source "fs/Kconfig.binfmt"
1290 tristate "RISC OS personality"
1293 Say Y here to include the kernel code necessary if you want to run
1294 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1295 experimental; if this sounds frightening, say N and sleep in peace.
1296 You can also say M here to compile this support as a module (which
1297 will be called arthur).
1301 menu "Power management options"
1303 source "kernel/power/Kconfig"
1305 config ARCH_SUSPEND_POSSIBLE
1310 source "net/Kconfig"
1312 menu "Device Drivers"
1314 source "drivers/base/Kconfig"
1316 source "drivers/connector/Kconfig"
1318 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1319 source "drivers/mtd/Kconfig"
1322 source "drivers/parport/Kconfig"
1324 source "drivers/pnp/Kconfig"
1326 source "drivers/block/Kconfig"
1328 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1330 source "drivers/misc/Kconfig"
1332 source "drivers/ide/Kconfig"
1334 source "drivers/scsi/Kconfig"
1336 source "drivers/ata/Kconfig"
1338 source "drivers/md/Kconfig"
1340 source "drivers/message/fusion/Kconfig"
1342 source "drivers/ieee1394/Kconfig"
1344 source "drivers/message/i2o/Kconfig"
1346 source "drivers/net/Kconfig"
1348 source "drivers/isdn/Kconfig"
1350 # input before char - char/joystick depends on it. As does USB.
1352 source "drivers/input/Kconfig"
1354 source "drivers/char/Kconfig"
1356 source "drivers/i2c/Kconfig"
1358 source "drivers/spi/Kconfig"
1360 source "drivers/gpio/Kconfig"
1362 source "drivers/w1/Kconfig"
1364 source "drivers/power/Kconfig"
1366 source "drivers/hwmon/Kconfig"
1368 source "drivers/thermal/Kconfig"
1370 source "drivers/watchdog/Kconfig"
1372 source "drivers/ssb/Kconfig"
1374 #source "drivers/l3/Kconfig"
1376 source "drivers/mfd/Kconfig"
1378 source "drivers/media/Kconfig"
1380 source "drivers/video/Kconfig"
1382 source "sound/Kconfig"
1384 source "drivers/hid/Kconfig"
1386 source "drivers/usb/Kconfig"
1388 source "drivers/uwb/Kconfig"
1390 source "drivers/mmc/Kconfig"
1392 source "drivers/memstick/Kconfig"
1394 source "drivers/accessibility/Kconfig"
1396 source "drivers/leds/Kconfig"
1398 source "drivers/rtc/Kconfig"
1400 source "drivers/dma/Kconfig"
1402 source "drivers/dca/Kconfig"
1404 source "drivers/auxdisplay/Kconfig"
1406 source "drivers/regulator/Kconfig"
1408 source "drivers/uio/Kconfig"
1410 source "drivers/staging/Kconfig"
1416 source "arch/arm/Kconfig.debug"
1418 source "security/Kconfig"
1420 source "crypto/Kconfig"
1422 source "lib/Kconfig"