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.
783 source "arch/arm/common/Kconfig"
785 config FORCE_MAX_ZONEORDER
798 Find out whether you have ISA slots on your motherboard. ISA is the
799 name of a bus system, i.e. the way the CPU talks to the other stuff
800 inside your box. Other bus systems are PCI, EISA, MicroChannel
801 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
802 newer boards don't support it. If you have ISA, say Y, otherwise N.
804 # Select ISA DMA controller support
809 # Select ISA DMA interface
814 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
816 Find out whether you have a PCI motherboard. PCI is the name of a
817 bus system, i.e. the way the CPU talks to the other stuff inside
818 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
819 VESA. If you have PCI, say Y, otherwise N.
824 # Select the host bridge type
825 config PCI_HOST_VIA82C505
827 depends on PCI && ARCH_SHARK
830 config PCI_HOST_ITE8152
832 depends on PCI && MACH_ARMCORE
836 source "drivers/pci/Kconfig"
838 source "drivers/pcmcia/Kconfig"
842 menu "Kernel Features"
844 source "kernel/time/Kconfig"
847 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
848 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
849 select USE_GENERIC_SMP_HELPERS
851 This enables support for systems with more than one CPU. If you have
852 a system with only one CPU, like most personal computers, say N. If
853 you have a system with more than one CPU, say Y.
855 If you say N here, the kernel will run on single and multiprocessor
856 machines, but will use only one CPU of a multiprocessor machine. If
857 you say Y here, the kernel will run on many, but not all, single
858 processor machines. On a single processor machine, the kernel will
859 run faster if you say N here.
861 See also <file:Documentation/i386/IO-APIC.txt>,
862 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
863 <http://www.linuxdoc.org/docs.html#howto>.
865 If you don't know what to do here, say N.
868 prompt "Memory split"
871 Select the desired split between kernel and user memory.
873 If you are not absolutely sure what you are doing, leave this
877 bool "3G/1G user/kernel split"
879 bool "2G/2G user/kernel split"
881 bool "1G/3G user/kernel split"
886 default 0x40000000 if VMSPLIT_1G
887 default 0x80000000 if VMSPLIT_2G
891 int "Maximum number of CPUs (2-32)"
897 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
898 depends on SMP && HOTPLUG && EXPERIMENTAL
900 Say Y here to experiment with turning CPUs off and on. CPUs
901 can be controlled through /sys/devices/system/cpu.
904 bool "Use local timer interrupts"
905 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
908 Enable support for local timers on SMP platforms, rather then the
909 legacy IPI broadcast method. Local timers allows the system
910 accounting to be spread across the timer interval, preventing a
911 "thundering herd" at every timer tick.
914 bool "Preemptible Kernel (EXPERIMENTAL)"
915 depends on EXPERIMENTAL
917 This option reduces the latency of the kernel when reacting to
918 real-time or interactive events by allowing a low priority process to
919 be preempted even if it is in kernel mode executing a system call.
920 This allows applications to run more reliably even when the system is
923 Say Y here if you are building a kernel for a desktop, embedded
924 or real-time system. Say N if you are unsure.
928 default 128 if ARCH_L7200
929 default 200 if ARCH_EBSA110 || ARCH_S3C2410
930 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
931 default AT91_TIMER_HZ if ARCH_AT91
935 bool "Use the ARM EABI to compile the kernel"
937 This option allows for the kernel to be compiled using the latest
938 ARM ABI (aka EABI). This is only useful if you are using a user
939 space environment that is also compiled with EABI.
941 Since there are major incompatibilities between the legacy ABI and
942 EABI, especially with regard to structure member alignment, this
943 option also changes the kernel syscall calling convention to
944 disambiguate both ABIs and allow for backward compatibility support
945 (selected with CONFIG_OABI_COMPAT).
947 To use this you need GCC version 4.0.0 or later.
950 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
951 depends on AEABI && EXPERIMENTAL
954 This option preserves the old syscall interface along with the
955 new (ARM EABI) one. It also provides a compatibility layer to
956 intercept syscalls that have structure arguments which layout
957 in memory differs between the legacy ABI and the new ARM EABI
958 (only for non "thumb" binaries). This option adds a tiny
959 overhead to all syscalls and produces a slightly larger kernel.
960 If you know you'll be using only pure EABI user space then you
961 can say N here. If this option is not selected and you attempt
962 to execute a legacy ABI binary then the result will be
963 UNPREDICTABLE (in fact it can be predicted that it won't work
964 at all). If in doubt say Y.
966 config ARCH_FLATMEM_HAS_HOLES
971 # Discontigmem is deprecated
972 config ARCH_DISCONTIGMEM_ENABLE
975 config ARCH_SPARSEMEM_ENABLE
978 config ARCH_SPARSEMEM_DEFAULT
979 def_bool ARCH_SPARSEMEM_ENABLE
981 config ARCH_SELECT_MEMORY_MODEL
982 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
986 default "4" if ARCH_LH7A40X
988 depends on NEED_MULTIPLE_NODES
991 bool "High Memory Support (EXPERIMENTAL)"
992 depends on MMU && EXPERIMENTAL
994 The address space of ARM processors is only 4 Gigabytes large
995 and it has to accommodate user address space, kernel address
996 space as well as some memory mapped IO. That means that, if you
997 have a large amount of physical memory and/or IO, not all of the
998 memory can be "permanently mapped" by the kernel. The physical
999 memory that is not permanently mapped is called "high memory".
1001 Depending on the selected kernel/user memory split, minimum
1002 vmalloc space and actual amount of RAM, you may not need this
1003 option which should result in a slightly faster kernel.
1010 bool "Timer and CPU usage LEDs"
1011 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1012 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
1013 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1014 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1015 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1016 ARCH_AT91 || ARCH_DAVINCI || \
1017 ARCH_KS8695 || MACH_RD88F5182
1019 If you say Y here, the LEDs on your machine will be used
1020 to provide useful information about your current system status.
1022 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1023 be able to select which LEDs are active using the options below. If
1024 you are compiling a kernel for the EBSA-110 or the LART however, the
1025 red LED will simply flash regularly to indicate that the system is
1026 still functional. It is safe to say Y here if you have a CATS
1027 system, but the driver will do nothing.
1030 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1031 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1032 || MACH_OMAP_PERSEUS2
1034 depends on !GENERIC_CLOCKEVENTS
1035 default y if ARCH_EBSA110
1037 If you say Y here, one of the system LEDs (the green one on the
1038 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1039 will flash regularly to indicate that the system is still
1040 operational. This is mainly useful to kernel hackers who are
1041 debugging unstable kernels.
1043 The LART uses the same LED for both Timer LED and CPU usage LED
1044 functions. You may choose to use both, but the Timer LED function
1045 will overrule the CPU usage LED.
1048 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1050 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1051 || MACH_OMAP_PERSEUS2
1054 If you say Y here, the red LED will be used to give a good real
1055 time indication of CPU usage, by lighting whenever the idle task
1056 is not currently executing.
1058 The LART uses the same LED for both Timer LED and CPU usage LED
1059 functions. You may choose to use both, but the Timer LED function
1060 will overrule the CPU usage LED.
1062 config ALIGNMENT_TRAP
1064 depends on CPU_CP15_MMU
1065 default y if !ARCH_EBSA110
1067 ARM processors cannot fetch/store information which is not
1068 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1069 address divisible by 4. On 32-bit ARM processors, these non-aligned
1070 fetch/store instructions will be emulated in software if you say
1071 here, which has a severe performance impact. This is necessary for
1072 correct operation of some network protocols. With an IP-only
1073 configuration it is safe to say N, otherwise say Y.
1079 # Compressed boot loader in ROM. Yes, we really want to ask about
1080 # TEXT and BSS so we preserve their values in the config files.
1081 config ZBOOT_ROM_TEXT
1082 hex "Compressed ROM boot loader base address"
1085 The physical address at which the ROM-able zImage is to be
1086 placed in the target. Platforms which normally make use of
1087 ROM-able zImage formats normally set this to a suitable
1088 value in their defconfig file.
1090 If ZBOOT_ROM is not enabled, this has no effect.
1092 config ZBOOT_ROM_BSS
1093 hex "Compressed ROM boot loader BSS address"
1096 The base address of an area of read/write memory in the target
1097 for the ROM-able zImage which must be available while the
1098 decompressor is running. It must be large enough to hold the
1099 entire decompressed kernel plus an additional 128 KiB.
1100 Platforms which normally make use of ROM-able zImage formats
1101 normally set this to a suitable value in their defconfig file.
1103 If ZBOOT_ROM is not enabled, this has no effect.
1106 bool "Compressed boot loader in ROM/flash"
1107 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1109 Say Y here if you intend to execute your compressed kernel image
1110 (zImage) directly from ROM or flash. If unsure, say N.
1113 string "Default kernel command string"
1116 On some architectures (EBSA110 and CATS), there is currently no way
1117 for the boot loader to pass arguments to the kernel. For these
1118 architectures, you should supply some command-line options at build
1119 time by entering them here. As a minimum, you should specify the
1120 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1123 bool "Kernel Execute-In-Place from ROM"
1124 depends on !ZBOOT_ROM
1126 Execute-In-Place allows the kernel to run from non-volatile storage
1127 directly addressable by the CPU, such as NOR flash. This saves RAM
1128 space since the text section of the kernel is not loaded from flash
1129 to RAM. Read-write sections, such as the data section and stack,
1130 are still copied to RAM. The XIP kernel is not compressed since
1131 it has to run directly from flash, so it will take more space to
1132 store it. The flash address used to link the kernel object files,
1133 and for storing it, is configuration dependent. Therefore, if you
1134 say Y here, you must know the proper physical address where to
1135 store the kernel image depending on your own flash memory usage.
1137 Also note that the make target becomes "make xipImage" rather than
1138 "make zImage" or "make Image". The final kernel binary to put in
1139 ROM memory will be arch/arm/boot/xipImage.
1143 config XIP_PHYS_ADDR
1144 hex "XIP Kernel Physical Location"
1145 depends on XIP_KERNEL
1146 default "0x00080000"
1148 This is the physical address in your flash memory the kernel will
1149 be linked for and stored to. This address is dependent on your
1153 bool "Kexec system call (EXPERIMENTAL)"
1154 depends on EXPERIMENTAL
1156 kexec is a system call that implements the ability to shutdown your
1157 current kernel, and to start another kernel. It is like a reboot
1158 but it is independent of the system firmware. And like a reboot
1159 you can start any kernel with it, not just Linux.
1161 It is an ongoing process to be certain the hardware in a machine
1162 is properly shutdown, so do not be surprised if this code does not
1163 initially work for you. It may help to enable device hotplugging
1167 bool "Export atags in procfs"
1171 Should the atags used to boot the kernel be exported in an "atags"
1172 file in procfs. Useful with kexec.
1176 menu "CPU Power Management"
1178 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1180 source "drivers/cpufreq/Kconfig"
1182 config CPU_FREQ_SA1100
1184 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1187 config CPU_FREQ_SA1110
1189 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1192 config CPU_FREQ_INTEGRATOR
1193 tristate "CPUfreq driver for ARM Integrator CPUs"
1194 depends on ARCH_INTEGRATOR && CPU_FREQ
1197 This enables the CPUfreq driver for ARM Integrator CPUs.
1199 For details, take a look at <file:Documentation/cpu-freq>.
1204 tristate "CPUfreq driver for i.MX CPUs"
1205 depends on ARCH_IMX && CPU_FREQ
1208 This enables the CPUfreq driver for i.MX CPUs.
1214 source "drivers/cpuidle/Kconfig"
1218 menu "Floating point emulation"
1220 comment "At least one emulation must be selected"
1223 bool "NWFPE math emulation"
1224 depends on !AEABI || OABI_COMPAT
1226 Say Y to include the NWFPE floating point emulator in the kernel.
1227 This is necessary to run most binaries. Linux does not currently
1228 support floating point hardware so you need to say Y here even if
1229 your machine has an FPA or floating point co-processor podule.
1231 You may say N here if you are going to load the Acorn FPEmulator
1232 early in the bootup.
1235 bool "Support extended precision"
1236 depends on FPE_NWFPE
1238 Say Y to include 80-bit support in the kernel floating-point
1239 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1240 Note that gcc does not generate 80-bit operations by default,
1241 so in most cases this option only enlarges the size of the
1242 floating point emulator without any good reason.
1244 You almost surely want to say N here.
1247 bool "FastFPE math emulation (EXPERIMENTAL)"
1248 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1250 Say Y here to include the FAST floating point emulator in the kernel.
1251 This is an experimental much faster emulator which now also has full
1252 precision for the mantissa. It does not support any exceptions.
1253 It is very simple, and approximately 3-6 times faster than NWFPE.
1255 It should be sufficient for most programs. It may be not suitable
1256 for scientific calculations, but you have to check this for yourself.
1257 If you do not feel you need a faster FP emulation you should better
1261 bool "VFP-format floating point maths"
1262 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1264 Say Y to include VFP support code in the kernel. This is needed
1265 if your hardware includes a VFP unit.
1267 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1268 release notes and additional status information.
1270 Say N if your target does not have VFP hardware.
1278 bool "Advanced SIMD (NEON) Extension support"
1279 depends on VFPv3 && CPU_V7
1281 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1286 menu "Userspace binary formats"
1288 source "fs/Kconfig.binfmt"
1291 tristate "RISC OS personality"
1294 Say Y here to include the kernel code necessary if you want to run
1295 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1296 experimental; if this sounds frightening, say N and sleep in peace.
1297 You can also say M here to compile this support as a module (which
1298 will be called arthur).
1302 menu "Power management options"
1304 source "kernel/power/Kconfig"
1306 config ARCH_SUSPEND_POSSIBLE
1311 source "net/Kconfig"
1313 menu "Device Drivers"
1315 source "drivers/base/Kconfig"
1317 source "drivers/connector/Kconfig"
1319 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1320 source "drivers/mtd/Kconfig"
1323 source "drivers/parport/Kconfig"
1325 source "drivers/pnp/Kconfig"
1327 source "drivers/block/Kconfig"
1329 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1331 source "drivers/misc/Kconfig"
1333 source "drivers/ide/Kconfig"
1335 source "drivers/scsi/Kconfig"
1337 source "drivers/ata/Kconfig"
1339 source "drivers/md/Kconfig"
1341 source "drivers/message/fusion/Kconfig"
1343 source "drivers/ieee1394/Kconfig"
1345 source "drivers/message/i2o/Kconfig"
1347 source "drivers/net/Kconfig"
1349 source "drivers/isdn/Kconfig"
1351 # input before char - char/joystick depends on it. As does USB.
1353 source "drivers/input/Kconfig"
1355 source "drivers/char/Kconfig"
1357 source "drivers/i2c/Kconfig"
1359 source "drivers/spi/Kconfig"
1361 source "drivers/gpio/Kconfig"
1363 source "drivers/w1/Kconfig"
1365 source "drivers/power/Kconfig"
1367 source "drivers/hwmon/Kconfig"
1369 source "drivers/thermal/Kconfig"
1371 source "drivers/watchdog/Kconfig"
1373 source "drivers/ssb/Kconfig"
1375 #source "drivers/l3/Kconfig"
1377 source "drivers/mfd/Kconfig"
1379 source "drivers/media/Kconfig"
1381 source "drivers/video/Kconfig"
1383 source "sound/Kconfig"
1385 source "drivers/hid/Kconfig"
1387 source "drivers/usb/Kconfig"
1389 source "drivers/uwb/Kconfig"
1391 source "drivers/mmc/Kconfig"
1393 source "drivers/memstick/Kconfig"
1395 source "drivers/accessibility/Kconfig"
1397 source "drivers/leds/Kconfig"
1399 source "drivers/rtc/Kconfig"
1401 source "drivers/dma/Kconfig"
1403 source "drivers/dca/Kconfig"
1405 source "drivers/auxdisplay/Kconfig"
1407 source "drivers/regulator/Kconfig"
1409 source "drivers/uio/Kconfig"
1411 source "drivers/staging/Kconfig"
1417 source "arch/arm/Kconfig.debug"
1419 source "security/Kconfig"
1421 source "crypto/Kconfig"
1423 source "lib/Kconfig"