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