arch/arm/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 mainmenu "Linux Kernel Configuration"
   7
   8 config ARM
   9         bool
  10         default y
  11         select HAVE_IDE
  12         select RTC_LIB
  13         select SYS_SUPPORTS_APM_EMULATION
  14         select HAVE_OPROFILE
  15         select HAVE_KPROBES if (!XIP_KERNEL)
  16         select HAVE_KRETPROBES if (HAVE_KPROBES)
  17         help
  18           The ARM series is a line of low-power-consumption RISC chip designs
  19           licensed by ARM Ltd and targeted at embedded applications and
  20           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  21           manufactured, but legacy ARM-based PC hardware remains popular in
  22           Europe.  There is an ARM Linux project with a web page at
  23           <http://www.arm.linux.org.uk/>.
  24
  25 config SYS_SUPPORTS_APM_EMULATION
  26         bool
  27
  28 config GENERIC_GPIO
  29         bool
  30         default n
  31
  32 config GENERIC_TIME
  33         bool
  34         default n
  35
  36 config GENERIC_CLOCKEVENTS
  37         bool
  38         default n
  39
  40 config GENERIC_CLOCKEVENTS_BROADCAST
  41         bool
  42         depends on GENERIC_CLOCKEVENTS
  43         default y if SMP && !LOCAL_TIMERS
  44
  45 config MMU
  46         bool
  47         default y
  48
  49 config NO_IOPORT
  50         bool
  51         default n
  52
  53 config EISA
  54         bool
  55         ---help---
  56           The Extended Industry Standard Architecture (EISA) bus was
  57           developed as an open alternative to the IBM MicroChannel bus.
  58
  59           The EISA bus provided some of the features of the IBM MicroChannel
  60           bus while maintaining backward compatibility with cards made for
  61           the older ISA bus.  The EISA bus saw limited use between 1988 and
  62           1995 when it was made obsolete by the PCI bus.
  63
  64           Say Y here if you are building a kernel for an EISA-based machine.
  65
  66           Otherwise, say N.
  67
  68 config SBUS
  69         bool
  70
  71 config MCA
  72         bool
  73         help
  74           MicroChannel Architecture is found in some IBM PS/2 machines and
  75           laptops.  It is a bus system similar to PCI or ISA. See
  76           <file:Documentation/mca.txt> (and especially the web page given
  77           there) before attempting to build an MCA bus kernel.
  78
  79 config GENERIC_HARDIRQS
  80         bool
  81         default y
  82
  83 config STACKTRACE_SUPPORT
  84         bool
  85         default y
  86
  87 config HAVE_LATENCYTOP_SUPPORT
  88         bool
  89         depends on !SMP
  90         default y
  91
  92 config LOCKDEP_SUPPORT
  93         bool
  94         default y
  95
  96 config TRACE_IRQFLAGS_SUPPORT
  97         bool
  98         default y
  99
 100 config HARDIRQS_SW_RESEND
 101         bool
 102         default y
 103
 104 config GENERIC_IRQ_PROBE
 105         bool
 106         default y
 107
 108 config GENERIC_LOCKBREAK
 109         bool
 110         default y
 111         depends on SMP && PREEMPT
 112
 113 config RWSEM_GENERIC_SPINLOCK
 114         bool
 115         default y
 116
 117 config RWSEM_XCHGADD_ALGORITHM
 118         bool
 119
 120 config ARCH_HAS_ILOG2_U32
 121         bool
 122         default n
 123
 124 config ARCH_HAS_ILOG2_U64
 125         bool
 126         default n
 127
 128 config GENERIC_HWEIGHT
 129         bool
 130         default y
 131
 132 config GENERIC_CALIBRATE_DELAY
 133         bool
 134         default y
 135
 136 config ARCH_SUPPORTS_AOUT
 137         def_bool y
 138
 139 config ARCH_MAY_HAVE_PC_FDC
 140         bool
 141
 142 config ZONE_DMA
 143         bool
 144         default y
 145
 146 config GENERIC_ISA_DMA
 147         bool
 148
 149 config FIQ
 150         bool
 151
 152 config ARCH_MTD_XIP
 153         bool
 154
 155 config GENERIC_HARDIRQS_NO__DO_IRQ
 156         bool
 157         def_bool y
 158
 159 if OPROFILE
 160
 161 config OPROFILE_ARMV6
 162         def_bool y
 163         depends on CPU_V6 && !SMP
 164         select OPROFILE_ARM11_CORE
 165
 166 config OPROFILE_MPCORE
 167         def_bool y
 168         depends on CPU_V6 && SMP
 169         select OPROFILE_ARM11_CORE
 170
 171 config OPROFILE_ARM11_CORE
 172         bool
 173
 174 endif
 175
 176 config VECTORS_BASE
 177         hex
 178         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 179         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 180         default 0x00000000
 181         help
 182           The base address of exception vectors.
 183
 184 source "init/Kconfig"
 185
 186 menu "System Type"
 187
 188 choice
 189         prompt "ARM system type"
 190         default ARCH_VERSATILE
 191
 192 config ARCH_AAEC2000
 193         bool "Agilent AAEC-2000 based"
 194         select ARM_AMBA
 195         help
 196           This enables support for systems based on the Agilent AAEC-2000
 197
 198 config ARCH_INTEGRATOR
 199         bool "ARM Ltd. Integrator family"
 200         select ARM_AMBA
 201         select ICST525
 202         help
 203           Support for ARM's Integrator platform.
 204
 205 config ARCH_REALVIEW
 206         bool "ARM Ltd. RealView family"
 207         select ARM_AMBA
 208         select ICST307
 209         select GENERIC_TIME
 210         select GENERIC_CLOCKEVENTS
 211         help
 212           This enables support for ARM Ltd RealView boards.
 213
 214 config ARCH_VERSATILE
 215         bool "ARM Ltd. Versatile family"
 216         select ARM_AMBA
 217         select ARM_VIC
 218         select ICST307
 219         select GENERIC_TIME
 220         select GENERIC_CLOCKEVENTS
 221         help
 222           This enables support for ARM Ltd Versatile board.
 223
 224 config ARCH_AT91
 225         bool "Atmel AT91"
 226         select GENERIC_GPIO
 227         help
 228           This enables support for systems based on the Atmel AT91RM9200,
 229           AT91SAM9 and AT91CAP9 processors.
 230
 231 config ARCH_CLPS7500
 232         bool "Cirrus CL-PS7500FE"
 233         select TIMER_ACORN
 234         select ISA
 235         select NO_IOPORT
 236         help
 237           Support for the Cirrus Logic PS7500FE system-on-a-chip.
 238
 239 config ARCH_CLPS711X
 240         bool "Cirrus Logic CLPS711x/EP721x-based"
 241         help
 242           Support for Cirrus Logic 711x/721x based boards.
 243
 244 config ARCH_EBSA110
 245         bool "EBSA-110"
 246         select ISA
 247         select NO_IOPORT
 248         help
 249           This is an evaluation board for the StrongARM processor available
 250           from Digital. It has limited hardware on-board, including an
 251           Ethernet interface, two PCMCIA sockets, two serial ports and a
 252           parallel port.
 253
 254 config ARCH_EP93XX
 255         bool "EP93xx-based"
 256         select ARM_AMBA
 257         select ARM_VIC
 258         select GENERIC_GPIO
 259         select HAVE_GPIO_LIB
 260         help
 261           This enables support for the Cirrus EP93xx series of CPUs.
 262
 263 config ARCH_FOOTBRIDGE
 264         bool "FootBridge"
 265         select FOOTBRIDGE
 266         help
 267           Support for systems based on the DC21285 companion chip
 268           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 269
 270 config ARCH_NETX
 271         bool "Hilscher NetX based"
 272         select ARM_VIC
 273         help
 274           This enables support for systems based on the Hilscher NetX Soc
 275
 276 config ARCH_H720X
 277         bool "Hynix HMS720x-based"
 278         select ISA_DMA_API
 279         help
 280           This enables support for systems based on the Hynix HMS720x
 281
 282 config ARCH_IMX
 283         bool "IMX"
 284         select GENERIC_GPIO
 285         select GENERIC_TIME
 286         select GENERIC_CLOCKEVENTS
 287         help
 288           Support for Motorola's i.MX family of processors (MX1, MXL).
 289
 290 config ARCH_IOP13XX
 291         bool "IOP13xx-based"
 292         depends on MMU
 293         select PLAT_IOP
 294         select PCI
 295         select ARCH_SUPPORTS_MSI
 296         help
 297           Support for Intel's IOP13XX (XScale) family of processors.
 298
 299 config ARCH_IOP32X
 300         bool "IOP32x-based"
 301         depends on MMU
 302         select PLAT_IOP
 303         select PCI
 304         select GENERIC_GPIO
 305         select HAVE_GPIO_LIB
 306         help
 307           Support for Intel's 80219 and IOP32X (XScale) family of
 308           processors.
 309
 310 config ARCH_IOP33X
 311         bool "IOP33x-based"
 312         depends on MMU
 313         select PLAT_IOP
 314         select PCI
 315         select GENERIC_GPIO
 316         select HAVE_GPIO_LIB
 317         help
 318           Support for Intel's IOP33X (XScale) family of processors.
 319
 320 config ARCH_IXP23XX
 321         bool "IXP23XX-based"
 322         depends on MMU
 323         select PCI
 324         help
 325           Support for Intel's IXP23xx (XScale) family of processors.
 326
 327 config ARCH_IXP2000
 328         bool "IXP2400/2800-based"
 329         depends on MMU
 330         select PCI
 331         help
 332           Support for Intel's IXP2400/2800 (XScale) family of processors.
 333
 334 config ARCH_IXP4XX
 335         bool "IXP4xx-based"
 336         depends on MMU
 337         select GENERIC_GPIO
 338         select GENERIC_TIME
 339         select GENERIC_CLOCKEVENTS
 340         help
 341           Support for Intel's IXP4XX (XScale) family of processors.
 342
 343 config ARCH_L7200
 344         bool "LinkUp-L7200"
 345         select FIQ
 346         help
 347           Say Y here if you intend to run this kernel on a LinkUp Systems
 348           L7200 Software Development Board which uses an ARM720T processor.
 349           Information on this board can be obtained at:
 350
 351           <http://www.linkupsys.com/>
 352
 353           If you have any questions or comments about the Linux kernel port
 354           to this board, send e-mail to <sjhill@cotw.com>.
 355
 356 config ARCH_KIRKWOOD
 357         bool "Marvell Kirkwood"
 358         select PCI
 359         select GENERIC_TIME
 360         select GENERIC_CLOCKEVENTS
 361         select PLAT_ORION
 362         help
 363           Support for the following Marvell Kirkwood series SoCs:
 364           88F6180, 88F6192 and 88F6281.
 365
 366 config ARCH_KS8695
 367         bool "Micrel/Kendin KS8695"
 368         select GENERIC_GPIO
 369         help
 370           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 371           System-on-Chip devices.
 372
 373 config ARCH_NS9XXX
 374         bool "NetSilicon NS9xxx"
 375         select GENERIC_GPIO
 376         select GENERIC_TIME
 377         select GENERIC_CLOCKEVENTS
 378         help
 379           Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
 380           System.
 381
 382           <http://www.digi.com/products/microprocessors/index.jsp>
 383
 384 config ARCH_LOKI
 385         bool "Marvell Loki (88RC8480)"
 386         select GENERIC_TIME
 387         select GENERIC_CLOCKEVENTS
 388         select PLAT_ORION
 389         help
 390           Support for the Marvell Loki (88RC8480) SoC.
 391
 392 config ARCH_MV78XX0
 393         bool "Marvell MV78xx0"
 394         select PCI
 395         select GENERIC_TIME
 396         select GENERIC_CLOCKEVENTS
 397         select PLAT_ORION
 398         help
 399           Support for the following Marvell MV78xx0 series SoCs:
 400           MV781x0, MV782x0.
 401
 402 config ARCH_MXC
 403         bool "Freescale MXC/iMX-based"
 404         select ARCH_MTD_XIP
 405         help
 406           Support for Freescale MXC/iMX-based family of processors
 407
 408 config ARCH_ORION5X
 409         bool "Marvell Orion"
 410         depends on MMU
 411         select PCI
 412         select GENERIC_GPIO
 413         select GENERIC_TIME
 414         select GENERIC_CLOCKEVENTS
 415         select PLAT_ORION
 416         help
 417           Support for the following Marvell Orion 5x series SoCs:
 418           Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
 419           Orion-2 (5281).
 420
 421 config ARCH_PNX4008
 422         bool "Philips Nexperia PNX4008 Mobile"
 423         help
 424           This enables support for Philips PNX4008 mobile platform.
 425
 426 config ARCH_PXA
 427         bool "PXA2xx/PXA3xx-based"
 428         depends on MMU
 429         select ARCH_MTD_XIP
 430         select GENERIC_GPIO
 431         select HAVE_GPIO_LIB
 432         select GENERIC_TIME
 433         select GENERIC_CLOCKEVENTS
 434         select TICK_ONESHOT
 435         help
 436           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 437
 438 config ARCH_RPC
 439         bool "RiscPC"
 440         select ARCH_ACORN
 441         select FIQ
 442         select TIMER_ACORN
 443         select ARCH_MAY_HAVE_PC_FDC
 444         select HAVE_PATA_PLATFORM
 445         select ISA_DMA_API
 446         select NO_IOPORT
 447         help
 448           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 449           CD-ROM interface, serial and parallel port, and the floppy drive.
 450
 451 config ARCH_SA1100
 452         bool "SA1100-based"
 453         select ISA
 454         select ARCH_DISCONTIGMEM_ENABLE
 455         select ARCH_SPARSEMEM_ENABLE
 456         select ARCH_SELECT_MEMORY_MODEL
 457         select ARCH_MTD_XIP
 458         select GENERIC_GPIO
 459         select GENERIC_TIME
 460         select GENERIC_CLOCKEVENTS
 461         select TICK_ONESHOT
 462         select HAVE_GPIO_LIB
 463         help
 464           Support for StrongARM 11x0 based boards.
 465
 466 config ARCH_S3C2410
 467         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
 468         select GENERIC_GPIO
 469         help
 470           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 471           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 472           the Samsung SMDK2410 development board (and derivatives).
 473
 474 config ARCH_SHARK
 475         bool "Shark"
 476         select ISA
 477         select ISA_DMA
 478         select PCI
 479         help
 480           Support for the StrongARM based Digital DNARD machine, also known
 481           as "Shark" (<http://www.shark-linux.de/shark.html>).
 482
 483 config ARCH_LH7A40X
 484         bool "Sharp LH7A40X"
 485         help
 486           Say Y here for systems based on one of the Sharp LH7A40X
 487           System on a Chip processors.  These CPUs include an ARM922T
 488           core with a wide array of integrated devices for
 489           hand-held and low-power applications.
 490
 491 config ARCH_DAVINCI
 492         bool "TI DaVinci"
 493         select GENERIC_TIME
 494         select GENERIC_CLOCKEVENTS
 495         select GENERIC_GPIO
 496         help
 497           Support for TI's DaVinci platform.
 498
 499 config ARCH_OMAP
 500         bool "TI OMAP"
 501         select GENERIC_GPIO
 502         select HAVE_GPIO_LIB
 503         select GENERIC_TIME
 504         select GENERIC_CLOCKEVENTS
 505         help
 506           Support for TI's OMAP platform (OMAP1 and OMAP2).
 507
 508 config ARCH_MSM7X00A
 509         bool "Qualcomm MSM7X00A"
 510         select GENERIC_TIME
 511         select GENERIC_CLOCKEVENTS
 512         help
 513           Support for Qualcomm MSM7X00A based systems.  This runs on the ARM11
 514           apps processor of the MSM7X00A and depends on a shared memory
 515           interface to the ARM9 modem processor which runs the baseband stack
 516           and controls some vital subsystems (clock and power control, etc).
 517           <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
 518
 519 endchoice
 520
 521 source "arch/arm/mach-clps711x/Kconfig"
 522
 523 source "arch/arm/mach-ep93xx/Kconfig"
 524
 525 source "arch/arm/mach-footbridge/Kconfig"
 526
 527 source "arch/arm/mach-integrator/Kconfig"
 528
 529 source "arch/arm/mach-iop32x/Kconfig"
 530
 531 source "arch/arm/mach-iop33x/Kconfig"
 532
 533 source "arch/arm/mach-iop13xx/Kconfig"
 534
 535 source "arch/arm/mach-ixp4xx/Kconfig"
 536
 537 source "arch/arm/mach-ixp2000/Kconfig"
 538
 539 source "arch/arm/mach-ixp23xx/Kconfig"
 540
 541 source "arch/arm/mach-loki/Kconfig"
 542
 543 source "arch/arm/mach-mv78xx0/Kconfig"
 544
 545 source "arch/arm/mach-pxa/Kconfig"
 546
 547 source "arch/arm/mach-sa1100/Kconfig"
 548
 549 source "arch/arm/plat-omap/Kconfig"
 550
 551 source "arch/arm/mach-omap1/Kconfig"
 552
 553 source "arch/arm/mach-omap2/Kconfig"
 554
 555 source "arch/arm/mach-orion5x/Kconfig"
 556
 557 source "arch/arm/mach-kirkwood/Kconfig"
 558
 559 source "arch/arm/plat-s3c24xx/Kconfig"
 560 source "arch/arm/plat-s3c/Kconfig"
 561
 562 if ARCH_S3C2410
 563 source "arch/arm/mach-s3c2400/Kconfig"
 564 source "arch/arm/mach-s3c2410/Kconfig"
 565 source "arch/arm/mach-s3c2412/Kconfig"
 566 source "arch/arm/mach-s3c2440/Kconfig"
 567 source "arch/arm/mach-s3c2442/Kconfig"
 568 source "arch/arm/mach-s3c2443/Kconfig"
 569 endif
 570
 571 source "arch/arm/mach-lh7a40x/Kconfig"
 572
 573 source "arch/arm/mach-imx/Kconfig"
 574
 575 source "arch/arm/mach-h720x/Kconfig"
 576
 577 source "arch/arm/mach-versatile/Kconfig"
 578
 579 source "arch/arm/mach-aaec2000/Kconfig"
 580
 581 source "arch/arm/mach-realview/Kconfig"
 582
 583 source "arch/arm/mach-at91/Kconfig"
 584
 585 source "arch/arm/plat-mxc/Kconfig"
 586
 587 source "arch/arm/mach-netx/Kconfig"
 588
 589 source "arch/arm/mach-ns9xxx/Kconfig"
 590
 591 source "arch/arm/mach-davinci/Kconfig"
 592
 593 source "arch/arm/mach-ks8695/Kconfig"
 594
 595 source "arch/arm/mach-msm/Kconfig"
 596
 597 # Definitions to make life easier
 598 config ARCH_ACORN
 599         bool
 600
 601 config PLAT_IOP
 602         bool
 603
 604 config PLAT_ORION
 605         bool
 606
 607 source arch/arm/mm/Kconfig
 608
 609 config IWMMXT
 610         bool "Enable iWMMXt support"
 611         depends on CPU_XSCALE || CPU_XSC3
 612         default y if PXA27x || PXA3xx
 613         help
 614           Enable support for iWMMXt context switching at run time if
 615           running on a CPU that supports it.
 616
 617 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 618 config XSCALE_PMU
 619         bool
 620         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 621         default y
 622
 623 if !MMU
 624 source "arch/arm/Kconfig-nommu"
 625 endif
 626
 627 endmenu
 628
 629 source "arch/arm/common/Kconfig"
 630
 631 config FORCE_MAX_ZONEORDER
 632         int
 633         depends on SA1111
 634         default "9"
 635
 636 menu "Bus support"
 637
 638 config ARM_AMBA
 639         bool
 640
 641 config ISA
 642         bool
 643         help
 644           Find out whether you have ISA slots on your motherboard.  ISA is the
 645           name of a bus system, i.e. the way the CPU talks to the other stuff
 646           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 647           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 648           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 649
 650 # Select ISA DMA controller support
 651 config ISA_DMA
 652         bool
 653         select ISA_DMA_API
 654
 655 # Select ISA DMA interface
 656 config ISA_DMA_API
 657         bool
 658
 659 config PCI
 660         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
 661         help
 662           Find out whether you have a PCI motherboard. PCI is the name of a
 663           bus system, i.e. the way the CPU talks to the other stuff inside
 664           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 665           VESA. If you have PCI, say Y, otherwise N.
 666
 667 config PCI_SYSCALL
 668         def_bool PCI
 669
 670 # Select the host bridge type
 671 config PCI_HOST_VIA82C505
 672         bool
 673         depends on PCI && ARCH_SHARK
 674         default y
 675
 676 config PCI_HOST_ITE8152
 677         bool
 678         depends on PCI && MACH_ARMCORE
 679         default y
 680         select DMABOUNCE
 681
 682 source "drivers/pci/Kconfig"
 683
 684 source "drivers/pcmcia/Kconfig"
 685
 686 endmenu
 687
 688 menu "Kernel Features"
 689
 690 source "kernel/time/Kconfig"
 691
 692 config SMP
 693         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 694         depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 695         help
 696           This enables support for systems with more than one CPU. If you have
 697           a system with only one CPU, like most personal computers, say N. If
 698           you have a system with more than one CPU, say Y.
 699
 700           If you say N here, the kernel will run on single and multiprocessor
 701           machines, but will use only one CPU of a multiprocessor machine. If
 702           you say Y here, the kernel will run on many, but not all, single
 703           processor machines. On a single processor machine, the kernel will
 704           run faster if you say N here.
 705
 706           See also <file:Documentation/i386/IO-APIC.txt>,
 707           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 708           <http://www.linuxdoc.org/docs.html#howto>.
 709
 710           If you don't know what to do here, say N.
 711
 712 config NR_CPUS
 713         int "Maximum number of CPUs (2-32)"
 714         range 2 32
 715         depends on SMP
 716         default "4"
 717
 718 config HOTPLUG_CPU
 719         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 720         depends on SMP && HOTPLUG && EXPERIMENTAL
 721         help
 722           Say Y here to experiment with turning CPUs off and on.  CPUs
 723           can be controlled through /sys/devices/system/cpu.
 724
 725 config LOCAL_TIMERS
 726         bool "Use local timer interrupts"
 727         depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 728         default y
 729         help
 730           Enable support for local timers on SMP platforms, rather then the
 731           legacy IPI broadcast method.  Local timers allows the system
 732           accounting to be spread across the timer interval, preventing a
 733           "thundering herd" at every timer tick.
 734
 735 config PREEMPT
 736         bool "Preemptible Kernel (EXPERIMENTAL)"
 737         depends on EXPERIMENTAL
 738         help
 739           This option reduces the latency of the kernel when reacting to
 740           real-time or interactive events by allowing a low priority process to
 741           be preempted even if it is in kernel mode executing a system call.
 742           This allows applications to run more reliably even when the system is
 743           under load.
 744
 745           Say Y here if you are building a kernel for a desktop, embedded
 746           or real-time system.  Say N if you are unsure.
 747
 748 config HZ
 749         int
 750         default 128 if ARCH_L7200
 751         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 752         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 753         default AT91_TIMER_HZ if ARCH_AT91
 754         default 100
 755
 756 config AEABI
 757         bool "Use the ARM EABI to compile the kernel"
 758         help
 759           This option allows for the kernel to be compiled using the latest
 760           ARM ABI (aka EABI).  This is only useful if you are using a user
 761           space environment that is also compiled with EABI.
 762
 763           Since there are major incompatibilities between the legacy ABI and
 764           EABI, especially with regard to structure member alignment, this
 765           option also changes the kernel syscall calling convention to
 766           disambiguate both ABIs and allow for backward compatibility support
 767           (selected with CONFIG_OABI_COMPAT).
 768
 769           To use this you need GCC version 4.0.0 or later.
 770
 771 config OABI_COMPAT
 772         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 773         depends on AEABI && EXPERIMENTAL
 774         default y
 775         help
 776           This option preserves the old syscall interface along with the
 777           new (ARM EABI) one. It also provides a compatibility layer to
 778           intercept syscalls that have structure arguments which layout
 779           in memory differs between the legacy ABI and the new ARM EABI
 780           (only for non "thumb" binaries). This option adds a tiny
 781           overhead to all syscalls and produces a slightly larger kernel.
 782           If you know you'll be using only pure EABI user space then you
 783           can say N here. If this option is not selected and you attempt
 784           to execute a legacy ABI binary then the result will be
 785           UNPREDICTABLE (in fact it can be predicted that it won't work
 786           at all). If in doubt say Y.
 787
 788 config ARCH_DISCONTIGMEM_ENABLE
 789         bool
 790         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 791         help
 792           Say Y to support efficient handling of discontiguous physical memory,
 793           for architectures which are either NUMA (Non-Uniform Memory Access)
 794           or have huge holes in the physical address space for other reasons.
 795           See <file:Documentation/vm/numa> for more.
 796
 797 config ARCH_SPARSEMEM_ENABLE
 798         bool
 799
 800 config ARCH_SELECT_MEMORY_MODEL
 801         bool
 802
 803 config NODES_SHIFT
 804         int
 805         default "4" if ARCH_LH7A40X
 806         default "2"
 807         depends on NEED_MULTIPLE_NODES
 808
 809 source "mm/Kconfig"
 810
 811 config LEDS
 812         bool "Timer and CPU usage LEDs"
 813         depends on ARCH_CDB89712 || ARCH_EBSA110 || \
 814                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 815                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 816                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 817                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 818                    ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
 819                    ARCH_KS8695 || MACH_RD88F5182
 820         help
 821           If you say Y here, the LEDs on your machine will be used
 822           to provide useful information about your current system status.
 823
 824           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 825           be able to select which LEDs are active using the options below. If
 826           you are compiling a kernel for the EBSA-110 or the LART however, the
 827           red LED will simply flash regularly to indicate that the system is
 828           still functional. It is safe to say Y here if you have a CATS
 829           system, but the driver will do nothing.
 830
 831 config LEDS_TIMER
 832         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 833                             OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 834                             || MACH_OMAP_PERSEUS2
 835         depends on LEDS
 836         depends on !GENERIC_CLOCKEVENTS
 837         default y if ARCH_EBSA110
 838         help
 839           If you say Y here, one of the system LEDs (the green one on the
 840           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 841           will flash regularly to indicate that the system is still
 842           operational. This is mainly useful to kernel hackers who are
 843           debugging unstable kernels.
 844
 845           The LART uses the same LED for both Timer LED and CPU usage LED
 846           functions. You may choose to use both, but the Timer LED function
 847           will overrule the CPU usage LED.
 848
 849 config LEDS_CPU
 850         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 851                         !ARCH_OMAP) \
 852                         || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 853                         || MACH_OMAP_PERSEUS2
 854         depends on LEDS
 855         help
 856           If you say Y here, the red LED will be used to give a good real
 857           time indication of CPU usage, by lighting whenever the idle task
 858           is not currently executing.
 859
 860           The LART uses the same LED for both Timer LED and CPU usage LED
 861           functions. You may choose to use both, but the Timer LED function
 862           will overrule the CPU usage LED.
 863
 864 config ALIGNMENT_TRAP
 865         bool
 866         depends on CPU_CP15_MMU
 867         default y if !ARCH_EBSA110
 868         help
 869           ARM processors cannot fetch/store information which is not
 870           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 871           address divisible by 4. On 32-bit ARM processors, these non-aligned
 872           fetch/store instructions will be emulated in software if you say
 873           here, which has a severe performance impact. This is necessary for
 874           correct operation of some network protocols. With an IP-only
 875           configuration it is safe to say N, otherwise say Y.
 876
 877 endmenu
 878
 879 menu "Boot options"
 880
 881 # Compressed boot loader in ROM.  Yes, we really want to ask about
 882 # TEXT and BSS so we preserve their values in the config files.
 883 config ZBOOT_ROM_TEXT
 884         hex "Compressed ROM boot loader base address"
 885         default "0"
 886         help
 887           The physical address at which the ROM-able zImage is to be
 888           placed in the target.  Platforms which normally make use of
 889           ROM-able zImage formats normally set this to a suitable
 890           value in their defconfig file.
 891
 892           If ZBOOT_ROM is not enabled, this has no effect.
 893
 894 config ZBOOT_ROM_BSS
 895         hex "Compressed ROM boot loader BSS address"
 896         default "0"
 897         help
 898           The base address of an area of read/write memory in the target
 899           for the ROM-able zImage which must be available while the
 900           decompressor is running. It must be large enough to hold the
 901           entire decompressed kernel plus an additional 128 KiB.
 902           Platforms which normally make use of ROM-able zImage formats
 903           normally set this to a suitable value in their defconfig file.
 904
 905           If ZBOOT_ROM is not enabled, this has no effect.
 906
 907 config ZBOOT_ROM
 908         bool "Compressed boot loader in ROM/flash"
 909         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 910         help
 911           Say Y here if you intend to execute your compressed kernel image
 912           (zImage) directly from ROM or flash.  If unsure, say N.
 913
 914 config CMDLINE
 915         string "Default kernel command string"
 916         default ""
 917         help
 918           On some architectures (EBSA110 and CATS), there is currently no way
 919           for the boot loader to pass arguments to the kernel. For these
 920           architectures, you should supply some command-line options at build
 921           time by entering them here. As a minimum, you should specify the
 922           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 923
 924 config XIP_KERNEL
 925         bool "Kernel Execute-In-Place from ROM"
 926         depends on !ZBOOT_ROM
 927         help
 928           Execute-In-Place allows the kernel to run from non-volatile storage
 929           directly addressable by the CPU, such as NOR flash. This saves RAM
 930           space since the text section of the kernel is not loaded from flash
 931           to RAM.  Read-write sections, such as the data section and stack,
 932           are still copied to RAM.  The XIP kernel is not compressed since
 933           it has to run directly from flash, so it will take more space to
 934           store it.  The flash address used to link the kernel object files,
 935           and for storing it, is configuration dependent. Therefore, if you
 936           say Y here, you must know the proper physical address where to
 937           store the kernel image depending on your own flash memory usage.
 938
 939           Also note that the make target becomes "make xipImage" rather than
 940           "make zImage" or "make Image".  The final kernel binary to put in
 941           ROM memory will be arch/arm/boot/xipImage.
 942
 943           If unsure, say N.
 944
 945 config XIP_PHYS_ADDR
 946         hex "XIP Kernel Physical Location"
 947         depends on XIP_KERNEL
 948         default "0x00080000"
 949         help
 950           This is the physical address in your flash memory the kernel will
 951           be linked for and stored to.  This address is dependent on your
 952           own flash usage.
 953
 954 config KEXEC
 955         bool "Kexec system call (EXPERIMENTAL)"
 956         depends on EXPERIMENTAL
 957         help
 958           kexec is a system call that implements the ability to shutdown your
 959           current kernel, and to start another kernel.  It is like a reboot
 960           but it is independent of the system firmware.   And like a reboot
 961           you can start any kernel with it, not just Linux.
 962
 963           It is an ongoing process to be certain the hardware in a machine
 964           is properly shutdown, so do not be surprised if this code does not
 965           initially work for you.  It may help to enable device hotplugging
 966           support.
 967
 968 config ATAGS_PROC
 969         bool "Export atags in procfs"
 970         depends on KEXEC
 971         default y
 972         help
 973           Should the atags used to boot the kernel be exported in an "atags"
 974           file in procfs. Useful with kexec.
 975
 976 endmenu
 977
 978 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
 979
 980 menu "CPU Frequency scaling"
 981
 982 source "drivers/cpufreq/Kconfig"
 983
 984 config CPU_FREQ_SA1100
 985         bool
 986         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 987         default y
 988
 989 config CPU_FREQ_SA1110
 990         bool
 991         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 992         default y
 993
 994 config CPU_FREQ_INTEGRATOR
 995         tristate "CPUfreq driver for ARM Integrator CPUs"
 996         depends on ARCH_INTEGRATOR && CPU_FREQ
 997         default y
 998         help
 999           This enables the CPUfreq driver for ARM Integrator CPUs.
1000
1001           For details, take a look at <file:Documentation/cpu-freq>.
1002
1003           If in doubt, say Y.
1004
1005 config CPU_FREQ_IMX
1006         tristate "CPUfreq driver for i.MX CPUs"
1007         depends on ARCH_IMX && CPU_FREQ
1008         default n
1009         help
1010           This enables the CPUfreq driver for i.MX CPUs.
1011
1012           If in doubt, say N.
1013
1014 config CPU_FREQ_PXA
1015         bool
1016         depends on CPU_FREQ && ARCH_PXA && PXA25x
1017         default y
1018         select CPU_FREQ_DEFAULT_GOV_USERSPACE
1019
1020 endmenu
1021
1022 endif
1023
1024 menu "Floating point emulation"
1025
1026 comment "At least one emulation must be selected"
1027
1028 config FPE_NWFPE
1029         bool "NWFPE math emulation"
1030         depends on !AEABI || OABI_COMPAT
1031         ---help---
1032           Say Y to include the NWFPE floating point emulator in the kernel.
1033           This is necessary to run most binaries. Linux does not currently
1034           support floating point hardware so you need to say Y here even if
1035           your machine has an FPA or floating point co-processor podule.
1036
1037           You may say N here if you are going to load the Acorn FPEmulator
1038           early in the bootup.
1039
1040 config FPE_NWFPE_XP
1041         bool "Support extended precision"
1042         depends on FPE_NWFPE
1043         help
1044           Say Y to include 80-bit support in the kernel floating-point
1045           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
1046           Note that gcc does not generate 80-bit operations by default,
1047           so in most cases this option only enlarges the size of the
1048           floating point emulator without any good reason.
1049
1050           You almost surely want to say N here.
1051
1052 config FPE_FASTFPE
1053         bool "FastFPE math emulation (EXPERIMENTAL)"
1054         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1055         ---help---
1056           Say Y here to include the FAST floating point emulator in the kernel.
1057           This is an experimental much faster emulator which now also has full
1058           precision for the mantissa.  It does not support any exceptions.
1059           It is very simple, and approximately 3-6 times faster than NWFPE.
1060
1061           It should be sufficient for most programs.  It may be not suitable
1062           for scientific calculations, but you have to check this for yourself.
1063           If you do not feel you need a faster FP emulation you should better
1064           choose NWFPE.
1065
1066 config VFP
1067         bool "VFP-format floating point maths"
1068         depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1069         help
1070           Say Y to include VFP support code in the kernel. This is needed
1071           if your hardware includes a VFP unit.
1072
1073           Please see <file:Documentation/arm/VFP/release-notes.txt> for
1074           release notes and additional status information.
1075
1076           Say N if your target does not have VFP hardware.
1077
1078 config VFPv3
1079         bool
1080         depends on VFP
1081         default y if CPU_V7
1082
1083 config NEON
1084         bool "Advanced SIMD (NEON) Extension support"
1085         depends on VFPv3 && CPU_V7
1086         help
1087           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1088           Extension.
1089
1090 endmenu
1091
1092 menu "Userspace binary formats"
1093
1094 source "fs/Kconfig.binfmt"
1095
1096 config ARTHUR
1097         tristate "RISC OS personality"
1098         depends on !AEABI
1099         help
1100           Say Y here to include the kernel code necessary if you want to run
1101           Acorn RISC OS/Arthur binaries under Linux. This code is still very
1102           experimental; if this sounds frightening, say N and sleep in peace.
1103           You can also say M here to compile this support as a module (which
1104           will be called arthur).
1105
1106 endmenu
1107
1108 menu "Power management options"
1109
1110 source "kernel/power/Kconfig"
1111
1112 config ARCH_SUSPEND_POSSIBLE
1113         def_bool y
1114
1115 endmenu
1116
1117 source "net/Kconfig"
1118
1119 menu "Device Drivers"
1120
1121 source "drivers/base/Kconfig"
1122
1123 source "drivers/connector/Kconfig"
1124
1125 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1126 source "drivers/mtd/Kconfig"
1127 endif
1128
1129 source "drivers/parport/Kconfig"
1130
1131 source "drivers/pnp/Kconfig"
1132
1133 source "drivers/block/Kconfig"
1134
1135 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1136
1137 source "drivers/misc/Kconfig"
1138
1139 source "drivers/ide/Kconfig"
1140
1141 source "drivers/scsi/Kconfig"
1142
1143 source "drivers/ata/Kconfig"
1144
1145 source "drivers/md/Kconfig"
1146
1147 source "drivers/message/fusion/Kconfig"
1148
1149 source "drivers/ieee1394/Kconfig"
1150
1151 source "drivers/message/i2o/Kconfig"
1152
1153 source "drivers/net/Kconfig"
1154
1155 source "drivers/isdn/Kconfig"
1156
1157 # input before char - char/joystick depends on it. As does USB.
1158
1159 source "drivers/input/Kconfig"
1160
1161 source "drivers/char/Kconfig"
1162
1163 source "drivers/i2c/Kconfig"
1164
1165 source "drivers/spi/Kconfig"
1166
1167 source "drivers/gpio/Kconfig"
1168
1169 source "drivers/w1/Kconfig"
1170
1171 source "drivers/power/Kconfig"
1172
1173 source "drivers/hwmon/Kconfig"
1174
1175 source "drivers/watchdog/Kconfig"
1176
1177 source "drivers/ssb/Kconfig"
1178
1179 #source "drivers/l3/Kconfig"
1180
1181 source "drivers/mfd/Kconfig"
1182
1183 source "drivers/media/Kconfig"
1184
1185 source "drivers/video/Kconfig"
1186
1187 source "sound/Kconfig"
1188
1189 source "drivers/hid/Kconfig"
1190
1191 source "drivers/usb/Kconfig"
1192
1193 source "drivers/mmc/Kconfig"
1194
1195 source "drivers/leds/Kconfig"
1196
1197 source "drivers/rtc/Kconfig"
1198
1199 source "drivers/dma/Kconfig"
1200
1201 source "drivers/dca/Kconfig"
1202
1203 source "drivers/uio/Kconfig"
1204
1205 endmenu
1206
1207 source "fs/Kconfig"
1208
1209 source "arch/arm/Kconfig.debug"
1210
1211 source "security/Kconfig"
1212
1213 source "crypto/Kconfig"
1214
1215 source "lib/Kconfig"