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         select HAVE_FTRACE if (!XIP_KERNEL)
  18         select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE)
  19         select HAVE_GENERIC_DMA_COHERENT
  20         help
  21           The ARM series is a line of low-power-consumption RISC chip designs
  22           licensed by ARM Ltd and targeted at embedded applications and
  23           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  24           manufactured, but legacy ARM-based PC hardware remains popular in
  25           Europe.  There is an ARM Linux project with a web page at
  26           <http://www.arm.linux.org.uk/>.
  27
  28 config HAVE_PWM
  29         bool
  30
  31 config SYS_SUPPORTS_APM_EMULATION
  32         bool
  33
  34 config GENERIC_GPIO
  35         bool
  36         default n
  37
  38 config GENERIC_TIME
  39         bool
  40         default n
  41
  42 config GENERIC_CLOCKEVENTS
  43         bool
  44         default n
  45
  46 config GENERIC_CLOCKEVENTS_BROADCAST
  47         bool
  48         depends on GENERIC_CLOCKEVENTS
  49         default y if SMP && !LOCAL_TIMERS
  50
  51 config MMU
  52         bool
  53         default y
  54
  55 config NO_IOPORT
  56         bool
  57         default n
  58
  59 config EISA
  60         bool
  61         ---help---
  62           The Extended Industry Standard Architecture (EISA) bus was
  63           developed as an open alternative to the IBM MicroChannel bus.
  64
  65           The EISA bus provided some of the features of the IBM MicroChannel
  66           bus while maintaining backward compatibility with cards made for
  67           the older ISA bus.  The EISA bus saw limited use between 1988 and
  68           1995 when it was made obsolete by the PCI bus.
  69
  70           Say Y here if you are building a kernel for an EISA-based machine.
  71
  72           Otherwise, say N.
  73
  74 config SBUS
  75         bool
  76
  77 config MCA
  78         bool
  79         help
  80           MicroChannel Architecture is found in some IBM PS/2 machines and
  81           laptops.  It is a bus system similar to PCI or ISA. See
  82           <file:Documentation/mca.txt> (and especially the web page given
  83           there) before attempting to build an MCA bus kernel.
  84
  85 config GENERIC_HARDIRQS
  86         bool
  87         default y
  88
  89 config STACKTRACE_SUPPORT
  90         bool
  91         default y
  92
  93 config HAVE_LATENCYTOP_SUPPORT
  94         bool
  95         depends on !SMP
  96         default y
  97
  98 config LOCKDEP_SUPPORT
  99         bool
 100         default y
 101
 102 config TRACE_IRQFLAGS_SUPPORT
 103         bool
 104         default y
 105
 106 config HARDIRQS_SW_RESEND
 107         bool
 108         default y
 109
 110 config GENERIC_IRQ_PROBE
 111         bool
 112         default y
 113
 114 config GENERIC_LOCKBREAK
 115         bool
 116         default y
 117         depends on SMP && PREEMPT
 118
 119 config RWSEM_GENERIC_SPINLOCK
 120         bool
 121         default y
 122
 123 config RWSEM_XCHGADD_ALGORITHM
 124         bool
 125
 126 config ARCH_HAS_ILOG2_U32
 127         bool
 128         default n
 129
 130 config ARCH_HAS_ILOG2_U64
 131         bool
 132         default n
 133
 134 config GENERIC_HWEIGHT
 135         bool
 136         default y
 137
 138 config GENERIC_CALIBRATE_DELAY
 139         bool
 140         default y
 141
 142 config ARCH_SUPPORTS_AOUT
 143         def_bool y
 144
 145 config ARCH_MAY_HAVE_PC_FDC
 146         bool
 147
 148 config ZONE_DMA
 149         bool
 150         default y
 151
 152 config GENERIC_ISA_DMA
 153         bool
 154
 155 config FIQ
 156         bool
 157
 158 config ARCH_MTD_XIP
 159         bool
 160
 161 config GENERIC_HARDIRQS_NO__DO_IRQ
 162         bool
 163         def_bool y
 164
 165 if OPROFILE
 166
 167 config OPROFILE_ARMV6
 168         def_bool y
 169         depends on CPU_V6 && !SMP
 170         select OPROFILE_ARM11_CORE
 171
 172 config OPROFILE_MPCORE
 173         def_bool y
 174         depends on CPU_V6 && SMP
 175         select OPROFILE_ARM11_CORE
 176
 177 config OPROFILE_ARM11_CORE
 178         bool
 179
 180 endif
 181
 182 config VECTORS_BASE
 183         hex
 184         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 185         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 186         default 0x00000000
 187         help
 188           The base address of exception vectors.
 189
 190 source "init/Kconfig"
 191
 192 menu "System Type"
 193
 194 choice
 195         prompt "ARM system type"
 196         default ARCH_VERSATILE
 197
 198 config ARCH_AAEC2000
 199         bool "Agilent AAEC-2000 based"
 200         select ARM_AMBA
 201         help
 202           This enables support for systems based on the Agilent AAEC-2000
 203
 204 config ARCH_INTEGRATOR
 205         bool "ARM Ltd. Integrator family"
 206         select ARM_AMBA
 207         select ICST525
 208         help
 209           Support for ARM's Integrator platform.
 210
 211 config ARCH_REALVIEW
 212         bool "ARM Ltd. RealView family"
 213         select ARM_AMBA
 214         select ICST307
 215         select GENERIC_TIME
 216         select GENERIC_CLOCKEVENTS
 217         help
 218           This enables support for ARM Ltd RealView boards.
 219
 220 config ARCH_VERSATILE
 221         bool "ARM Ltd. Versatile family"
 222         select ARM_AMBA
 223         select ARM_VIC
 224         select ICST307
 225         select GENERIC_TIME
 226         select GENERIC_CLOCKEVENTS
 227         help
 228           This enables support for ARM Ltd Versatile board.
 229
 230 config ARCH_AT91
 231         bool "Atmel AT91"
 232         select GENERIC_GPIO
 233         help
 234           This enables support for systems based on the Atmel AT91RM9200,
 235           AT91SAM9 and AT91CAP9 processors.
 236
 237 config ARCH_CLPS7500
 238         bool "Cirrus CL-PS7500FE"
 239         select TIMER_ACORN
 240         select ISA
 241         select NO_IOPORT
 242         help
 243           Support for the Cirrus Logic PS7500FE system-on-a-chip.
 244
 245 config ARCH_CLPS711X
 246         bool "Cirrus Logic CLPS711x/EP721x-based"
 247         help
 248           Support for Cirrus Logic 711x/721x based boards.
 249
 250 config ARCH_EBSA110
 251         bool "EBSA-110"
 252         select ISA
 253         select NO_IOPORT
 254         help
 255           This is an evaluation board for the StrongARM processor available
 256           from Digital. It has limited hardware on-board, including an
 257           Ethernet interface, two PCMCIA sockets, two serial ports and a
 258           parallel port.
 259
 260 config ARCH_EP93XX
 261         bool "EP93xx-based"
 262         select ARM_AMBA
 263         select ARM_VIC
 264         select GENERIC_GPIO
 265         select HAVE_GPIO_LIB
 266         help
 267           This enables support for the Cirrus EP93xx series of CPUs.
 268
 269 config ARCH_FOOTBRIDGE
 270         bool "FootBridge"
 271         select FOOTBRIDGE
 272         help
 273           Support for systems based on the DC21285 companion chip
 274           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 275
 276 config ARCH_NETX
 277         bool "Hilscher NetX based"
 278         select ARM_VIC
 279         help
 280           This enables support for systems based on the Hilscher NetX Soc
 281
 282 config ARCH_H720X
 283         bool "Hynix HMS720x-based"
 284         select ISA_DMA_API
 285         help
 286           This enables support for systems based on the Hynix HMS720x
 287
 288 config ARCH_IMX
 289         bool "IMX"
 290         select GENERIC_GPIO
 291         select GENERIC_TIME
 292         select GENERIC_CLOCKEVENTS
 293         help
 294           Support for Motorola's i.MX family of processors (MX1, MXL).
 295
 296 config ARCH_IOP13XX
 297         bool "IOP13xx-based"
 298         depends on MMU
 299         select PLAT_IOP
 300         select PCI
 301         select ARCH_SUPPORTS_MSI
 302         help
 303           Support for Intel's IOP13XX (XScale) family of processors.
 304
 305 config ARCH_IOP32X
 306         bool "IOP32x-based"
 307         depends on MMU
 308         select PLAT_IOP
 309         select PCI
 310         select GENERIC_GPIO
 311         select HAVE_GPIO_LIB
 312         help
 313           Support for Intel's 80219 and IOP32X (XScale) family of
 314           processors.
 315
 316 config ARCH_IOP33X
 317         bool "IOP33x-based"
 318         depends on MMU
 319         select PLAT_IOP
 320         select PCI
 321         select GENERIC_GPIO
 322         select HAVE_GPIO_LIB
 323         help
 324           Support for Intel's IOP33X (XScale) family of processors.
 325
 326 config ARCH_IXP23XX
 327         bool "IXP23XX-based"
 328         depends on MMU
 329         select PCI
 330         help
 331           Support for Intel's IXP23xx (XScale) family of processors.
 332
 333 config ARCH_IXP2000
 334         bool "IXP2400/2800-based"
 335         depends on MMU
 336         select PCI
 337         help
 338           Support for Intel's IXP2400/2800 (XScale) family of processors.
 339
 340 config ARCH_IXP4XX
 341         bool "IXP4xx-based"
 342         depends on MMU
 343         select GENERIC_GPIO
 344         select GENERIC_TIME
 345         select GENERIC_CLOCKEVENTS
 346         help
 347           Support for Intel's IXP4XX (XScale) family of processors.
 348
 349 config ARCH_L7200
 350         bool "LinkUp-L7200"
 351         select FIQ
 352         help
 353           Say Y here if you intend to run this kernel on a LinkUp Systems
 354           L7200 Software Development Board which uses an ARM720T processor.
 355           Information on this board can be obtained at:
 356
 357           <http://www.linkupsys.com/>
 358
 359           If you have any questions or comments about the Linux kernel port
 360           to this board, send e-mail to <sjhill@cotw.com>.
 361
 362 config ARCH_KIRKWOOD
 363         bool "Marvell Kirkwood"
 364         select PCI
 365         select GENERIC_TIME
 366         select GENERIC_CLOCKEVENTS
 367         select PLAT_ORION
 368         help
 369           Support for the following Marvell Kirkwood series SoCs:
 370           88F6180, 88F6192 and 88F6281.
 371
 372 config ARCH_KS8695
 373         bool "Micrel/Kendin KS8695"
 374         select GENERIC_GPIO
 375         help
 376           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 377           System-on-Chip devices.
 378
 379 config ARCH_NS9XXX
 380         bool "NetSilicon NS9xxx"
 381         select GENERIC_GPIO
 382         select GENERIC_TIME
 383         select GENERIC_CLOCKEVENTS
 384         help
 385           Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
 386           System.
 387
 388           <http://www.digi.com/products/microprocessors/index.jsp>
 389
 390 config ARCH_LOKI
 391         bool "Marvell Loki (88RC8480)"
 392         select GENERIC_TIME
 393         select GENERIC_CLOCKEVENTS
 394         select PLAT_ORION
 395         help
 396           Support for the Marvell Loki (88RC8480) SoC.
 397
 398 config ARCH_MV78XX0
 399         bool "Marvell MV78xx0"
 400         select PCI
 401         select GENERIC_TIME
 402         select GENERIC_CLOCKEVENTS
 403         select PLAT_ORION
 404         help
 405           Support for the following Marvell MV78xx0 series SoCs:
 406           MV781x0, MV782x0.
 407
 408 config ARCH_MXC
 409         bool "Freescale MXC/iMX-based"
 410         select GENERIC_TIME
 411         select GENERIC_CLOCKEVENTS
 412         select ARCH_MTD_XIP
 413         select GENERIC_GPIO
 414         select HAVE_GPIO_LIB
 415         help
 416           Support for Freescale MXC/iMX-based family of processors
 417
 418 config ARCH_ORION5X
 419         bool "Marvell Orion"
 420         depends on MMU
 421         select PCI
 422         select GENERIC_GPIO
 423         select GENERIC_TIME
 424         select GENERIC_CLOCKEVENTS
 425         select PLAT_ORION
 426         help
 427           Support for the following Marvell Orion 5x series SoCs:
 428           Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
 429           Orion-2 (5281).
 430
 431 config ARCH_PNX4008
 432         bool "Philips Nexperia PNX4008 Mobile"
 433         help
 434           This enables support for Philips PNX4008 mobile platform.
 435
 436 config ARCH_PXA
 437         bool "PXA2xx/PXA3xx-based"
 438         depends on MMU
 439         select ARCH_MTD_XIP
 440         select GENERIC_GPIO
 441         select HAVE_GPIO_LIB
 442         select GENERIC_TIME
 443         select GENERIC_CLOCKEVENTS
 444         select TICK_ONESHOT
 445         help
 446           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 447
 448 config ARCH_RPC
 449         bool "RiscPC"
 450         select ARCH_ACORN
 451         select FIQ
 452         select TIMER_ACORN
 453         select ARCH_MAY_HAVE_PC_FDC
 454         select HAVE_PATA_PLATFORM
 455         select ISA_DMA_API
 456         select NO_IOPORT
 457         help
 458           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 459           CD-ROM interface, serial and parallel port, and the floppy drive.
 460
 461 config ARCH_SA1100
 462         bool "SA1100-based"
 463         select ISA
 464         select ARCH_DISCONTIGMEM_ENABLE
 465         select ARCH_SPARSEMEM_ENABLE
 466         select ARCH_SELECT_MEMORY_MODEL
 467         select ARCH_MTD_XIP
 468         select GENERIC_GPIO
 469         select GENERIC_TIME
 470         select GENERIC_CLOCKEVENTS
 471         select TICK_ONESHOT
 472         select HAVE_GPIO_LIB
 473         help
 474           Support for StrongARM 11x0 based boards.
 475
 476 config ARCH_S3C2410
 477         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
 478         select GENERIC_GPIO
 479         help
 480           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 481           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 482           the Samsung SMDK2410 development board (and derivatives).
 483
 484 config ARCH_SHARK
 485         bool "Shark"
 486         select ISA
 487         select ISA_DMA
 488         select PCI
 489         help
 490           Support for the StrongARM based Digital DNARD machine, also known
 491           as "Shark" (<http://www.shark-linux.de/shark.html>).
 492
 493 config ARCH_LH7A40X
 494         bool "Sharp LH7A40X"
 495         help
 496           Say Y here for systems based on one of the Sharp LH7A40X
 497           System on a Chip processors.  These CPUs include an ARM922T
 498           core with a wide array of integrated devices for
 499           hand-held and low-power applications.
 500
 501 config ARCH_DAVINCI
 502         bool "TI DaVinci"
 503         select GENERIC_TIME
 504         select GENERIC_CLOCKEVENTS
 505         select GENERIC_GPIO
 506         help
 507           Support for TI's DaVinci platform.
 508
 509 config ARCH_OMAP
 510         bool "TI OMAP"
 511         select GENERIC_GPIO
 512         select HAVE_GPIO_LIB
 513         select GENERIC_TIME
 514         select GENERIC_CLOCKEVENTS
 515         help
 516           Support for TI's OMAP platform (OMAP1 and OMAP2).
 517
 518 config ARCH_MSM7X00A
 519         bool "Qualcomm MSM7X00A"
 520         select GENERIC_TIME
 521         select GENERIC_CLOCKEVENTS
 522         help
 523           Support for Qualcomm MSM7X00A based systems.  This runs on the ARM11
 524           apps processor of the MSM7X00A and depends on a shared memory
 525           interface to the ARM9 modem processor which runs the baseband stack
 526           and controls some vital subsystems (clock and power control, etc).
 527           <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
 528
 529 endchoice
 530
 531 source "arch/arm/mach-clps711x/Kconfig"
 532
 533 source "arch/arm/mach-ep93xx/Kconfig"
 534
 535 source "arch/arm/mach-footbridge/Kconfig"
 536
 537 source "arch/arm/mach-integrator/Kconfig"
 538
 539 source "arch/arm/mach-iop32x/Kconfig"
 540
 541 source "arch/arm/mach-iop33x/Kconfig"
 542
 543 source "arch/arm/mach-iop13xx/Kconfig"
 544
 545 source "arch/arm/mach-ixp4xx/Kconfig"
 546
 547 source "arch/arm/mach-ixp2000/Kconfig"
 548
 549 source "arch/arm/mach-ixp23xx/Kconfig"
 550
 551 source "arch/arm/mach-loki/Kconfig"
 552
 553 source "arch/arm/mach-mv78xx0/Kconfig"
 554
 555 source "arch/arm/mach-pxa/Kconfig"
 556
 557 source "arch/arm/mach-sa1100/Kconfig"
 558
 559 source "arch/arm/plat-omap/Kconfig"
 560
 561 source "arch/arm/mach-omap1/Kconfig"
 562
 563 source "arch/arm/mach-omap2/Kconfig"
 564
 565 source "arch/arm/mach-orion5x/Kconfig"
 566
 567 source "arch/arm/mach-kirkwood/Kconfig"
 568
 569 source "arch/arm/plat-s3c24xx/Kconfig"
 570 source "arch/arm/plat-s3c/Kconfig"
 571
 572 if ARCH_S3C2410
 573 source "arch/arm/mach-s3c2400/Kconfig"
 574 source "arch/arm/mach-s3c2410/Kconfig"
 575 source "arch/arm/mach-s3c2412/Kconfig"
 576 source "arch/arm/mach-s3c2440/Kconfig"
 577 source "arch/arm/mach-s3c2442/Kconfig"
 578 source "arch/arm/mach-s3c2443/Kconfig"
 579 endif
 580
 581 source "arch/arm/mach-lh7a40x/Kconfig"
 582
 583 source "arch/arm/mach-imx/Kconfig"
 584
 585 source "arch/arm/mach-h720x/Kconfig"
 586
 587 source "arch/arm/mach-versatile/Kconfig"
 588
 589 source "arch/arm/mach-aaec2000/Kconfig"
 590
 591 source "arch/arm/mach-realview/Kconfig"
 592
 593 source "arch/arm/mach-at91/Kconfig"
 594
 595 source "arch/arm/plat-mxc/Kconfig"
 596
 597 source "arch/arm/mach-netx/Kconfig"
 598
 599 source "arch/arm/mach-ns9xxx/Kconfig"
 600
 601 source "arch/arm/mach-davinci/Kconfig"
 602
 603 source "arch/arm/mach-ks8695/Kconfig"
 604
 605 source "arch/arm/mach-msm/Kconfig"
 606
 607 # Definitions to make life easier
 608 config ARCH_ACORN
 609         bool
 610
 611 config PLAT_IOP
 612         bool
 613
 614 config PLAT_ORION
 615         bool
 616
 617 source arch/arm/mm/Kconfig
 618
 619 config IWMMXT
 620         bool "Enable iWMMXt support"
 621         depends on CPU_XSCALE || CPU_XSC3
 622         default y if PXA27x || PXA3xx
 623         help
 624           Enable support for iWMMXt context switching at run time if
 625           running on a CPU that supports it.
 626
 627 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 628 config XSCALE_PMU
 629         bool
 630         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 631         default y
 632
 633 if !MMU
 634 source "arch/arm/Kconfig-nommu"
 635 endif
 636
 637 endmenu
 638
 639 source "arch/arm/common/Kconfig"
 640
 641 config FORCE_MAX_ZONEORDER
 642         int
 643         depends on SA1111
 644         default "9"
 645
 646 menu "Bus support"
 647
 648 config ARM_AMBA
 649         bool
 650
 651 config ISA
 652         bool
 653         help
 654           Find out whether you have ISA slots on your motherboard.  ISA is the
 655           name of a bus system, i.e. the way the CPU talks to the other stuff
 656           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 657           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 658           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 659
 660 # Select ISA DMA controller support
 661 config ISA_DMA
 662         bool
 663         select ISA_DMA_API
 664
 665 # Select ISA DMA interface
 666 config ISA_DMA_API
 667         bool
 668
 669 config PCI
 670         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
 671         help
 672           Find out whether you have a PCI motherboard. PCI is the name of a
 673           bus system, i.e. the way the CPU talks to the other stuff inside
 674           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 675           VESA. If you have PCI, say Y, otherwise N.
 676
 677 config PCI_SYSCALL
 678         def_bool PCI
 679
 680 # Select the host bridge type
 681 config PCI_HOST_VIA82C505
 682         bool
 683         depends on PCI && ARCH_SHARK
 684         default y
 685
 686 config PCI_HOST_ITE8152
 687         bool
 688         depends on PCI && MACH_ARMCORE
 689         default y
 690         select DMABOUNCE
 691
 692 source "drivers/pci/Kconfig"
 693
 694 source "drivers/pcmcia/Kconfig"
 695
 696 endmenu
 697
 698 menu "Kernel Features"
 699
 700 source "kernel/time/Kconfig"
 701
 702 config SMP
 703         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 704         depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 705         select USE_GENERIC_SMP_HELPERS
 706         help
 707           This enables support for systems with more than one CPU. If you have
 708           a system with only one CPU, like most personal computers, say N. If
 709           you have a system with more than one CPU, say Y.
 710
 711           If you say N here, the kernel will run on single and multiprocessor
 712           machines, but will use only one CPU of a multiprocessor machine. If
 713           you say Y here, the kernel will run on many, but not all, single
 714           processor machines. On a single processor machine, the kernel will
 715           run faster if you say N here.
 716
 717           See also <file:Documentation/i386/IO-APIC.txt>,
 718           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 719           <http://www.linuxdoc.org/docs.html#howto>.
 720
 721           If you don't know what to do here, say N.
 722
 723 config NR_CPUS
 724         int "Maximum number of CPUs (2-32)"
 725         range 2 32
 726         depends on SMP
 727         default "4"
 728
 729 config HOTPLUG_CPU
 730         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 731         depends on SMP && HOTPLUG && EXPERIMENTAL
 732         help
 733           Say Y here to experiment with turning CPUs off and on.  CPUs
 734           can be controlled through /sys/devices/system/cpu.
 735
 736 config LOCAL_TIMERS
 737         bool "Use local timer interrupts"
 738         depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 739         default y
 740         help
 741           Enable support for local timers on SMP platforms, rather then the
 742           legacy IPI broadcast method.  Local timers allows the system
 743           accounting to be spread across the timer interval, preventing a
 744           "thundering herd" at every timer tick.
 745
 746 config PREEMPT
 747         bool "Preemptible Kernel (EXPERIMENTAL)"
 748         depends on EXPERIMENTAL
 749         help
 750           This option reduces the latency of the kernel when reacting to
 751           real-time or interactive events by allowing a low priority process to
 752           be preempted even if it is in kernel mode executing a system call.
 753           This allows applications to run more reliably even when the system is
 754           under load.
 755
 756           Say Y here if you are building a kernel for a desktop, embedded
 757           or real-time system.  Say N if you are unsure.
 758
 759 config HZ
 760         int
 761         default 128 if ARCH_L7200
 762         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 763         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 764         default AT91_TIMER_HZ if ARCH_AT91
 765         default 100
 766
 767 config AEABI
 768         bool "Use the ARM EABI to compile the kernel"
 769         help
 770           This option allows for the kernel to be compiled using the latest
 771           ARM ABI (aka EABI).  This is only useful if you are using a user
 772           space environment that is also compiled with EABI.
 773
 774           Since there are major incompatibilities between the legacy ABI and
 775           EABI, especially with regard to structure member alignment, this
 776           option also changes the kernel syscall calling convention to
 777           disambiguate both ABIs and allow for backward compatibility support
 778           (selected with CONFIG_OABI_COMPAT).
 779
 780           To use this you need GCC version 4.0.0 or later.
 781
 782 config OABI_COMPAT
 783         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 784         depends on AEABI && EXPERIMENTAL
 785         default y
 786         help
 787           This option preserves the old syscall interface along with the
 788           new (ARM EABI) one. It also provides a compatibility layer to
 789           intercept syscalls that have structure arguments which layout
 790           in memory differs between the legacy ABI and the new ARM EABI
 791           (only for non "thumb" binaries). This option adds a tiny
 792           overhead to all syscalls and produces a slightly larger kernel.
 793           If you know you'll be using only pure EABI user space then you
 794           can say N here. If this option is not selected and you attempt
 795           to execute a legacy ABI binary then the result will be
 796           UNPREDICTABLE (in fact it can be predicted that it won't work
 797           at all). If in doubt say Y.
 798
 799 config ARCH_DISCONTIGMEM_ENABLE
 800         bool
 801         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 802         help
 803           Say Y to support efficient handling of discontiguous physical memory,
 804           for architectures which are either NUMA (Non-Uniform Memory Access)
 805           or have huge holes in the physical address space for other reasons.
 806           See <file:Documentation/vm/numa> for more.
 807
 808 config ARCH_SPARSEMEM_ENABLE
 809         bool
 810
 811 config ARCH_SELECT_MEMORY_MODEL
 812         bool
 813
 814 config NODES_SHIFT
 815         int
 816         default "4" if ARCH_LH7A40X
 817         default "2"
 818         depends on NEED_MULTIPLE_NODES
 819
 820 source "mm/Kconfig"
 821
 822 config LEDS
 823         bool "Timer and CPU usage LEDs"
 824         depends on ARCH_CDB89712 || ARCH_EBSA110 || \
 825                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 826                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 827                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 828                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 829                    ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
 830                    ARCH_KS8695 || MACH_RD88F5182
 831         help
 832           If you say Y here, the LEDs on your machine will be used
 833           to provide useful information about your current system status.
 834
 835           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 836           be able to select which LEDs are active using the options below. If
 837           you are compiling a kernel for the EBSA-110 or the LART however, the
 838           red LED will simply flash regularly to indicate that the system is
 839           still functional. It is safe to say Y here if you have a CATS
 840           system, but the driver will do nothing.
 841
 842 config LEDS_TIMER
 843         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 844                             OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 845                             || MACH_OMAP_PERSEUS2
 846         depends on LEDS
 847         depends on !GENERIC_CLOCKEVENTS
 848         default y if ARCH_EBSA110
 849         help
 850           If you say Y here, one of the system LEDs (the green one on the
 851           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 852           will flash regularly to indicate that the system is still
 853           operational. This is mainly useful to kernel hackers who are
 854           debugging unstable kernels.
 855
 856           The LART uses the same LED for both Timer LED and CPU usage LED
 857           functions. You may choose to use both, but the Timer LED function
 858           will overrule the CPU usage LED.
 859
 860 config LEDS_CPU
 861         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 862                         !ARCH_OMAP) \
 863                         || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 864                         || MACH_OMAP_PERSEUS2
 865         depends on LEDS
 866         help
 867           If you say Y here, the red LED will be used to give a good real
 868           time indication of CPU usage, by lighting whenever the idle task
 869           is not currently executing.
 870
 871           The LART uses the same LED for both Timer LED and CPU usage LED
 872           functions. You may choose to use both, but the Timer LED function
 873           will overrule the CPU usage LED.
 874
 875 config ALIGNMENT_TRAP
 876         bool
 877         depends on CPU_CP15_MMU
 878         default y if !ARCH_EBSA110
 879         help
 880           ARM processors cannot fetch/store information which is not
 881           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 882           address divisible by 4. On 32-bit ARM processors, these non-aligned
 883           fetch/store instructions will be emulated in software if you say
 884           here, which has a severe performance impact. This is necessary for
 885           correct operation of some network protocols. With an IP-only
 886           configuration it is safe to say N, otherwise say Y.
 887
 888 endmenu
 889
 890 menu "Boot options"
 891
 892 # Compressed boot loader in ROM.  Yes, we really want to ask about
 893 # TEXT and BSS so we preserve their values in the config files.
 894 config ZBOOT_ROM_TEXT
 895         hex "Compressed ROM boot loader base address"
 896         default "0"
 897         help
 898           The physical address at which the ROM-able zImage is to be
 899           placed in the target.  Platforms which normally make use of
 900           ROM-able zImage formats normally set this to a suitable
 901           value in their defconfig file.
 902
 903           If ZBOOT_ROM is not enabled, this has no effect.
 904
 905 config ZBOOT_ROM_BSS
 906         hex "Compressed ROM boot loader BSS address"
 907         default "0"
 908         help
 909           The base address of an area of read/write memory in the target
 910           for the ROM-able zImage which must be available while the
 911           decompressor is running. It must be large enough to hold the
 912           entire decompressed kernel plus an additional 128 KiB.
 913           Platforms which normally make use of ROM-able zImage formats
 914           normally set this to a suitable value in their defconfig file.
 915
 916           If ZBOOT_ROM is not enabled, this has no effect.
 917
 918 config ZBOOT_ROM
 919         bool "Compressed boot loader in ROM/flash"
 920         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 921         help
 922           Say Y here if you intend to execute your compressed kernel image
 923           (zImage) directly from ROM or flash.  If unsure, say N.
 924
 925 config CMDLINE
 926         string "Default kernel command string"
 927         default ""
 928         help
 929           On some architectures (EBSA110 and CATS), there is currently no way
 930           for the boot loader to pass arguments to the kernel. For these
 931           architectures, you should supply some command-line options at build
 932           time by entering them here. As a minimum, you should specify the
 933           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 934
 935 config XIP_KERNEL
 936         bool "Kernel Execute-In-Place from ROM"
 937         depends on !ZBOOT_ROM
 938         help
 939           Execute-In-Place allows the kernel to run from non-volatile storage
 940           directly addressable by the CPU, such as NOR flash. This saves RAM
 941           space since the text section of the kernel is not loaded from flash
 942           to RAM.  Read-write sections, such as the data section and stack,
 943           are still copied to RAM.  The XIP kernel is not compressed since
 944           it has to run directly from flash, so it will take more space to
 945           store it.  The flash address used to link the kernel object files,
 946           and for storing it, is configuration dependent. Therefore, if you
 947           say Y here, you must know the proper physical address where to
 948           store the kernel image depending on your own flash memory usage.
 949
 950           Also note that the make target becomes "make xipImage" rather than
 951           "make zImage" or "make Image".  The final kernel binary to put in
 952           ROM memory will be arch/arm/boot/xipImage.
 953
 954           If unsure, say N.
 955
 956 config XIP_PHYS_ADDR
 957         hex "XIP Kernel Physical Location"
 958         depends on XIP_KERNEL
 959         default "0x00080000"
 960         help
 961           This is the physical address in your flash memory the kernel will
 962           be linked for and stored to.  This address is dependent on your
 963           own flash usage.
 964
 965 config KEXEC
 966         bool "Kexec system call (EXPERIMENTAL)"
 967         depends on EXPERIMENTAL
 968         help
 969           kexec is a system call that implements the ability to shutdown your
 970           current kernel, and to start another kernel.  It is like a reboot
 971           but it is independent of the system firmware.   And like a reboot
 972           you can start any kernel with it, not just Linux.
 973
 974           It is an ongoing process to be certain the hardware in a machine
 975           is properly shutdown, so do not be surprised if this code does not
 976           initially work for you.  It may help to enable device hotplugging
 977           support.
 978
 979 config ATAGS_PROC
 980         bool "Export atags in procfs"
 981         depends on KEXEC
 982         default y
 983         help
 984           Should the atags used to boot the kernel be exported in an "atags"
 985           file in procfs. Useful with kexec.
 986
 987 endmenu
 988
 989 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
 990
 991 menu "CPU Frequency scaling"
 992
 993 source "drivers/cpufreq/Kconfig"
 994
 995 config CPU_FREQ_SA1100
 996         bool
 997         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 998         default y
 999
1000 config CPU_FREQ_SA1110
1001         bool
1002         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1003         default y
1004
1005 config CPU_FREQ_INTEGRATOR
1006         tristate "CPUfreq driver for ARM Integrator CPUs"
1007         depends on ARCH_INTEGRATOR && CPU_FREQ
1008         default y
1009         help
1010           This enables the CPUfreq driver for ARM Integrator CPUs.
1011
1012           For details, take a look at <file:Documentation/cpu-freq>.
1013
1014           If in doubt, say Y.
1015
1016 config CPU_FREQ_IMX
1017         tristate "CPUfreq driver for i.MX CPUs"
1018         depends on ARCH_IMX && CPU_FREQ
1019         default n
1020         help
1021           This enables the CPUfreq driver for i.MX CPUs.
1022
1023           If in doubt, say N.
1024
1025 config CPU_FREQ_PXA
1026         bool
1027         depends on CPU_FREQ && ARCH_PXA && PXA25x
1028         default y
1029         select CPU_FREQ_DEFAULT_GOV_USERSPACE
1030
1031 endmenu
1032
1033 endif
1034
1035 menu "Floating point emulation"
1036
1037 comment "At least one emulation must be selected"
1038
1039 config FPE_NWFPE
1040         bool "NWFPE math emulation"
1041         depends on !AEABI || OABI_COMPAT
1042         ---help---
1043           Say Y to include the NWFPE floating point emulator in the kernel.
1044           This is necessary to run most binaries. Linux does not currently
1045           support floating point hardware so you need to say Y here even if
1046           your machine has an FPA or floating point co-processor podule.
1047
1048           You may say N here if you are going to load the Acorn FPEmulator
1049           early in the bootup.
1050
1051 config FPE_NWFPE_XP
1052         bool "Support extended precision"
1053         depends on FPE_NWFPE
1054         help
1055           Say Y to include 80-bit support in the kernel floating-point
1056           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
1057           Note that gcc does not generate 80-bit operations by default,
1058           so in most cases this option only enlarges the size of the
1059           floating point emulator without any good reason.
1060
1061           You almost surely want to say N here.
1062
1063 config FPE_FASTFPE
1064         bool "FastFPE math emulation (EXPERIMENTAL)"
1065         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1066         ---help---
1067           Say Y here to include the FAST floating point emulator in the kernel.
1068           This is an experimental much faster emulator which now also has full
1069           precision for the mantissa.  It does not support any exceptions.
1070           It is very simple, and approximately 3-6 times faster than NWFPE.
1071
1072           It should be sufficient for most programs.  It may be not suitable
1073           for scientific calculations, but you have to check this for yourself.
1074           If you do not feel you need a faster FP emulation you should better
1075           choose NWFPE.
1076
1077 config VFP
1078         bool "VFP-format floating point maths"
1079         depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1080         help
1081           Say Y to include VFP support code in the kernel. This is needed
1082           if your hardware includes a VFP unit.
1083
1084           Please see <file:Documentation/arm/VFP/release-notes.txt> for
1085           release notes and additional status information.
1086
1087           Say N if your target does not have VFP hardware.
1088
1089 config VFPv3
1090         bool
1091         depends on VFP
1092         default y if CPU_V7
1093
1094 config NEON
1095         bool "Advanced SIMD (NEON) Extension support"
1096         depends on VFPv3 && CPU_V7
1097         help
1098           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1099           Extension.
1100
1101 endmenu
1102
1103 menu "Userspace binary formats"
1104
1105 source "fs/Kconfig.binfmt"
1106
1107 config ARTHUR
1108         tristate "RISC OS personality"
1109         depends on !AEABI
1110         help
1111           Say Y here to include the kernel code necessary if you want to run
1112           Acorn RISC OS/Arthur binaries under Linux. This code is still very
1113           experimental; if this sounds frightening, say N and sleep in peace.
1114           You can also say M here to compile this support as a module (which
1115           will be called arthur).
1116
1117 endmenu
1118
1119 menu "Power management options"
1120
1121 source "kernel/power/Kconfig"
1122
1123 config ARCH_SUSPEND_POSSIBLE
1124         def_bool y
1125
1126 endmenu
1127
1128 source "net/Kconfig"
1129
1130 menu "Device Drivers"
1131
1132 source "drivers/base/Kconfig"
1133
1134 source "drivers/connector/Kconfig"
1135
1136 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1137 source "drivers/mtd/Kconfig"
1138 endif
1139
1140 source "drivers/parport/Kconfig"
1141
1142 source "drivers/pnp/Kconfig"
1143
1144 source "drivers/block/Kconfig"
1145
1146 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1147
1148 source "drivers/misc/Kconfig"
1149
1150 source "drivers/ide/Kconfig"
1151
1152 source "drivers/scsi/Kconfig"
1153
1154 source "drivers/ata/Kconfig"
1155
1156 source "drivers/md/Kconfig"
1157
1158 source "drivers/message/fusion/Kconfig"
1159
1160 source "drivers/ieee1394/Kconfig"
1161
1162 source "drivers/message/i2o/Kconfig"
1163
1164 source "drivers/net/Kconfig"
1165
1166 source "drivers/isdn/Kconfig"
1167
1168 # input before char - char/joystick depends on it. As does USB.
1169
1170 source "drivers/input/Kconfig"
1171
1172 source "drivers/char/Kconfig"
1173
1174 source "drivers/i2c/Kconfig"
1175
1176 source "drivers/spi/Kconfig"
1177
1178 source "drivers/gpio/Kconfig"
1179
1180 source "drivers/w1/Kconfig"
1181
1182 source "drivers/power/Kconfig"
1183
1184 source "drivers/hwmon/Kconfig"
1185
1186 source "drivers/watchdog/Kconfig"
1187
1188 source "drivers/ssb/Kconfig"
1189
1190 #source "drivers/l3/Kconfig"
1191
1192 source "drivers/mfd/Kconfig"
1193
1194 source "drivers/media/Kconfig"
1195
1196 source "drivers/video/Kconfig"
1197
1198 source "sound/Kconfig"
1199
1200 source "drivers/hid/Kconfig"
1201
1202 source "drivers/usb/Kconfig"
1203
1204 source "drivers/mmc/Kconfig"
1205
1206 source "drivers/leds/Kconfig"
1207
1208 source "drivers/rtc/Kconfig"
1209
1210 source "drivers/dma/Kconfig"
1211
1212 source "drivers/dca/Kconfig"
1213
1214 source "drivers/uio/Kconfig"
1215
1216 endmenu
1217
1218 source "fs/Kconfig"
1219
1220 source "arch/arm/Kconfig.debug"
1221
1222 source "security/Kconfig"
1223
1224 source "crypto/Kconfig"
1225
1226 source "lib/Kconfig"