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 RTC_LIB
  12         select SYS_SUPPORTS_APM_EMULATION
  13         select HAVE_OPROFILE
  14         select HAVE_KPROBES if (!XIP_KERNEL)
  15         select HAVE_KRETPROBES if (HAVE_KPROBES)
  16         help
  17           The ARM series is a line of low-power-consumption RISC chip designs
  18           licensed by ARM Ltd and targeted at embedded applications and
  19           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  20           manufactured, but legacy ARM-based PC hardware remains popular in
  21           Europe.  There is an ARM Linux project with a web page at
  22           <http://www.arm.linux.org.uk/>.
  23
  24 config SYS_SUPPORTS_APM_EMULATION
  25         bool
  26
  27 config GENERIC_GPIO
  28         bool
  29         default n
  30
  31 config GENERIC_TIME
  32         bool
  33         default n
  34
  35 config GENERIC_CLOCKEVENTS
  36         bool
  37         default n
  38
  39 config GENERIC_CLOCKEVENTS_BROADCAST
  40         bool
  41         depends on GENERIC_CLOCKEVENTS
  42         default y if SMP && !LOCAL_TIMERS
  43
  44 config MMU
  45         bool
  46         default y
  47
  48 config NO_IOPORT
  49         bool
  50         default n
  51
  52 config EISA
  53         bool
  54         ---help---
  55           The Extended Industry Standard Architecture (EISA) bus was
  56           developed as an open alternative to the IBM MicroChannel bus.
  57
  58           The EISA bus provided some of the features of the IBM MicroChannel
  59           bus while maintaining backward compatibility with cards made for
  60           the older ISA bus.  The EISA bus saw limited use between 1988 and
  61           1995 when it was made obsolete by the PCI bus.
  62
  63           Say Y here if you are building a kernel for an EISA-based machine.
  64
  65           Otherwise, say N.
  66
  67 config SBUS
  68         bool
  69
  70 config MCA
  71         bool
  72         help
  73           MicroChannel Architecture is found in some IBM PS/2 machines and
  74           laptops.  It is a bus system similar to PCI or ISA. See
  75           <file:Documentation/mca.txt> (and especially the web page given
  76           there) before attempting to build an MCA bus kernel.
  77
  78 config GENERIC_HARDIRQS
  79         bool
  80         default y
  81
  82 config STACKTRACE_SUPPORT
  83         bool
  84         default y
  85
  86 config LOCKDEP_SUPPORT
  87         bool
  88         default y
  89
  90 config TRACE_IRQFLAGS_SUPPORT
  91         bool
  92         default y
  93
  94 config HARDIRQS_SW_RESEND
  95         bool
  96         default y
  97
  98 config GENERIC_IRQ_PROBE
  99         bool
 100         default y
 101
 102 config GENERIC_LOCKBREAK
 103         bool
 104         default y
 105         depends on SMP && PREEMPT
 106
 107 config RWSEM_GENERIC_SPINLOCK
 108         bool
 109         default y
 110
 111 config RWSEM_XCHGADD_ALGORITHM
 112         bool
 113
 114 config ARCH_HAS_ILOG2_U32
 115         bool
 116         default n
 117
 118 config ARCH_HAS_ILOG2_U64
 119         bool
 120         default n
 121
 122 config GENERIC_HWEIGHT
 123         bool
 124         default y
 125
 126 config GENERIC_CALIBRATE_DELAY
 127         bool
 128         default y
 129
 130 config ARCH_SUPPORTS_AOUT
 131         def_bool y
 132
 133 config ARCH_MAY_HAVE_PC_FDC
 134         bool
 135
 136 config ZONE_DMA
 137         bool
 138         default y
 139
 140 config GENERIC_ISA_DMA
 141         bool
 142
 143 config FIQ
 144         bool
 145
 146 config ARCH_MTD_XIP
 147         bool
 148
 149 if OPROFILE
 150
 151 config OPROFILE_ARMV6
 152         def_bool y
 153         depends on CPU_V6 && !SMP
 154         select OPROFILE_ARM11_CORE
 155
 156 config OPROFILE_MPCORE
 157         def_bool y
 158         depends on CPU_V6 && SMP
 159         select OPROFILE_ARM11_CORE
 160
 161 config OPROFILE_ARM11_CORE
 162         bool
 163
 164 endif
 165
 166 config VECTORS_BASE
 167         hex
 168         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 169         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 170         default 0x00000000
 171         help
 172           The base address of exception vectors.
 173
 174 source "init/Kconfig"
 175
 176 menu "System Type"
 177
 178 choice
 179         prompt "ARM system type"
 180         default ARCH_VERSATILE
 181
 182 config ARCH_AAEC2000
 183         bool "Agilent AAEC-2000 based"
 184         select ARM_AMBA
 185         help
 186           This enables support for systems based on the Agilent AAEC-2000
 187
 188 config ARCH_INTEGRATOR
 189         bool "ARM Ltd. Integrator family"
 190         select ARM_AMBA
 191         select ICST525
 192         help
 193           Support for ARM's Integrator platform.
 194
 195 config ARCH_REALVIEW
 196         bool "ARM Ltd. RealView family"
 197         select ARM_AMBA
 198         select ICST307
 199         select GENERIC_TIME
 200         select GENERIC_CLOCKEVENTS
 201         help
 202           This enables support for ARM Ltd RealView boards.
 203
 204 config ARCH_VERSATILE
 205         bool "ARM Ltd. Versatile family"
 206         select ARM_AMBA
 207         select ARM_VIC
 208         select ICST307
 209         select GENERIC_TIME
 210         select GENERIC_CLOCKEVENTS
 211         help
 212           This enables support for ARM Ltd Versatile board.
 213
 214 config ARCH_AT91
 215         bool "Atmel AT91"
 216         select GENERIC_GPIO
 217         help
 218           This enables support for systems based on the Atmel AT91RM9200,
 219           AT91SAM9 and AT91CAP9 processors.
 220
 221 config ARCH_CLPS7500
 222         bool "Cirrus CL-PS7500FE"
 223         select TIMER_ACORN
 224         select ISA
 225         select NO_IOPORT
 226         select HAVE_IDE
 227         help
 228           Support for the Cirrus Logic PS7500FE system-on-a-chip.
 229
 230 config ARCH_CLPS711X
 231         bool "Cirrus Logic CLPS711x/EP721x-based"
 232         help
 233           Support for Cirrus Logic 711x/721x based boards.
 234
 235 config ARCH_CO285
 236         bool "Co-EBSA285"
 237         select FOOTBRIDGE
 238         select FOOTBRIDGE_ADDIN
 239         select HAVE_IDE
 240         help
 241           Support for Intel's EBSA285 companion chip.
 242
 243 config ARCH_EBSA110
 244         bool "EBSA-110"
 245         select ISA
 246         select NO_IOPORT
 247         help
 248           This is an evaluation board for the StrongARM processor available
 249           from Digital. It has limited hardware on-board, including an
 250           Ethernet interface, two PCMCIA sockets, two serial ports and a
 251           parallel port.
 252
 253 config ARCH_EP93XX
 254         bool "EP93xx-based"
 255         select ARM_AMBA
 256         select ARM_VIC
 257         select GENERIC_GPIO
 258         select HAVE_GPIO_LIB
 259         help
 260           This enables support for the Cirrus EP93xx series of CPUs.
 261
 262 config ARCH_FOOTBRIDGE
 263         bool "FootBridge"
 264         select FOOTBRIDGE
 265         select HAVE_IDE
 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 HAVE_IDE
 305         help
 306           Support for Intel's 80219 and IOP32X (XScale) family of
 307           processors.
 308
 309 config ARCH_IOP33X
 310         bool "IOP33x-based"
 311         depends on MMU
 312         select PLAT_IOP
 313         select PCI
 314         select HAVE_IDE
 315         help
 316           Support for Intel's IOP33X (XScale) family of processors.
 317
 318 config ARCH_IXP23XX
 319         bool "IXP23XX-based"
 320         depends on MMU
 321         select HAVE_IDE
 322         select PCI
 323         help
 324           Support for Intel's IXP23xx (XScale) family of processors.
 325
 326 config ARCH_IXP2000
 327         bool "IXP2400/2800-based"
 328         depends on MMU
 329         select PCI
 330         help
 331           Support for Intel's IXP2400/2800 (XScale) family of processors.
 332
 333 config ARCH_IXP4XX
 334         bool "IXP4xx-based"
 335         depends on MMU
 336         select GENERIC_GPIO
 337         select GENERIC_TIME
 338         select GENERIC_CLOCKEVENTS
 339         select HAVE_IDE
 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         select HAVE_IDE
 347         help
 348           Say Y here if you intend to run this kernel on a LinkUp Systems
 349           L7200 Software Development Board which uses an ARM720T processor.
 350           Information on this board can be obtained at:
 351
 352           <http://www.linkupsys.com/>
 353
 354           If you have any questions or comments about the Linux kernel port
 355           to this board, send e-mail to <sjhill@cotw.com>.
 356
 357 config ARCH_KS8695
 358         bool "Micrel/Kendin KS8695"
 359         select GENERIC_GPIO
 360         help
 361           Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
 362           System-on-Chip devices.
 363
 364 config ARCH_NS9XXX
 365         bool "NetSilicon NS9xxx"
 366         select GENERIC_GPIO
 367         select GENERIC_TIME
 368         select GENERIC_CLOCKEVENTS
 369         help
 370           Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
 371           System.
 372
 373           <http://www.digi.com/products/microprocessors/index.jsp>
 374
 375 config ARCH_MXC
 376         bool "Freescale MXC/iMX-based"
 377         select ARCH_MTD_XIP
 378         help
 379           Support for Freescale MXC/iMX-based family of processors
 380
 381 config ARCH_ORION5X
 382         bool "Marvell Orion"
 383         depends on MMU
 384         select PCI
 385         select GENERIC_GPIO
 386         select GENERIC_TIME
 387         select GENERIC_CLOCKEVENTS
 388         select PLAT_ORION
 389         help
 390           Support for the following Marvell Orion 5x series SoCs:
 391           Orion-1 (5181), Orion-NAS (5182), Orion-2 (5281.)
 392
 393 config ARCH_PNX4008
 394         bool "Philips Nexperia PNX4008 Mobile"
 395         help
 396           This enables support for Philips PNX4008 mobile platform.
 397
 398 config ARCH_PXA
 399         bool "PXA2xx/PXA3xx-based"
 400         depends on MMU
 401         select ARCH_MTD_XIP
 402         select GENERIC_GPIO
 403         select HAVE_IDE
 404         select HAVE_GPIO_LIB
 405         select GENERIC_TIME
 406         select GENERIC_CLOCKEVENTS
 407         select TICK_ONESHOT
 408         help
 409           Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
 410
 411 config ARCH_RPC
 412         bool "RiscPC"
 413         select ARCH_ACORN
 414         select FIQ
 415         select TIMER_ACORN
 416         select ARCH_MAY_HAVE_PC_FDC
 417         select ISA_DMA_API
 418         select NO_IOPORT
 419         select HAVE_IDE
 420         help
 421           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 422           CD-ROM interface, serial and parallel port, and the floppy drive.
 423
 424 config ARCH_SA1100
 425         bool "SA1100-based"
 426         select ISA
 427         select ARCH_DISCONTIGMEM_ENABLE
 428         select ARCH_SPARSEMEM_ENABLE
 429         select ARCH_SELECT_MEMORY_MODEL
 430         select ARCH_MTD_XIP
 431         select GENERIC_GPIO
 432         select GENERIC_TIME
 433         select GENERIC_CLOCKEVENTS
 434         select TICK_ONESHOT
 435         select HAVE_IDE
 436         select HAVE_GPIO_LIB
 437         help
 438           Support for StrongARM 11x0 based boards.
 439
 440 config ARCH_S3C2410
 441         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
 442         select GENERIC_GPIO
 443         select HAVE_IDE
 444         help
 445           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 446           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 447           the Samsung SMDK2410 development board (and derivatives).
 448
 449 config ARCH_SHARK
 450         bool "Shark"
 451         select HAVE_IDE
 452         select ISA
 453         select ISA_DMA
 454         select PCI
 455         help
 456           Support for the StrongARM based Digital DNARD machine, also known
 457           as "Shark" (<http://www.shark-linux.de/shark.html>).
 458
 459 config ARCH_LH7A40X
 460         bool "Sharp LH7A40X"
 461         select HAVE_IDE
 462         help
 463           Say Y here for systems based on one of the Sharp LH7A40X
 464           System on a Chip processors.  These CPUs include an ARM922T
 465           core with a wide array of integrated devices for
 466           hand-held and low-power applications.
 467
 468 config ARCH_DAVINCI
 469         bool "TI DaVinci"
 470         select GENERIC_TIME
 471         select GENERIC_CLOCKEVENTS
 472         select GENERIC_GPIO
 473         help
 474           Support for TI's DaVinci platform.
 475
 476 config ARCH_OMAP
 477         bool "TI OMAP"
 478         select GENERIC_GPIO
 479         select HAVE_GPIO_LIB
 480         select GENERIC_TIME
 481         select GENERIC_CLOCKEVENTS
 482         help
 483           Support for TI's OMAP platform (OMAP1 and OMAP2).
 484
 485 config ARCH_MSM7X00A
 486         bool "Qualcomm MSM7X00A"
 487         select GENERIC_TIME
 488         select GENERIC_CLOCKEVENTS
 489         help
 490           Support for Qualcomm MSM7X00A based systems.  This runs on the ARM11
 491           apps processor of the MSM7X00A and depends on a shared memory
 492           interface to the ARM9 modem processor which runs the baseband stack
 493           and controls some vital subsystems (clock and power control, etc).
 494           <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
 495
 496 endchoice
 497
 498 source "arch/arm/mach-clps711x/Kconfig"
 499
 500 source "arch/arm/mach-ep93xx/Kconfig"
 501
 502 source "arch/arm/mach-footbridge/Kconfig"
 503
 504 source "arch/arm/mach-integrator/Kconfig"
 505
 506 source "arch/arm/mach-iop32x/Kconfig"
 507
 508 source "arch/arm/mach-iop33x/Kconfig"
 509
 510 source "arch/arm/mach-iop13xx/Kconfig"
 511
 512 source "arch/arm/mach-ixp4xx/Kconfig"
 513
 514 source "arch/arm/mach-ixp2000/Kconfig"
 515
 516 source "arch/arm/mach-ixp23xx/Kconfig"
 517
 518 source "arch/arm/mach-pxa/Kconfig"
 519
 520 source "arch/arm/mach-sa1100/Kconfig"
 521
 522 source "arch/arm/plat-omap/Kconfig"
 523
 524 source "arch/arm/mach-omap1/Kconfig"
 525
 526 source "arch/arm/mach-omap2/Kconfig"
 527
 528 source "arch/arm/mach-orion5x/Kconfig"
 529
 530 source "arch/arm/plat-s3c24xx/Kconfig"
 531 source "arch/arm/plat-s3c/Kconfig"
 532
 533 if ARCH_S3C2410
 534 source "arch/arm/mach-s3c2400/Kconfig"
 535 source "arch/arm/mach-s3c2410/Kconfig"
 536 source "arch/arm/mach-s3c2412/Kconfig"
 537 source "arch/arm/mach-s3c2440/Kconfig"
 538 source "arch/arm/mach-s3c2442/Kconfig"
 539 source "arch/arm/mach-s3c2443/Kconfig"
 540 endif
 541
 542 source "arch/arm/mach-lh7a40x/Kconfig"
 543
 544 source "arch/arm/mach-imx/Kconfig"
 545
 546 source "arch/arm/mach-h720x/Kconfig"
 547
 548 source "arch/arm/mach-versatile/Kconfig"
 549
 550 source "arch/arm/mach-aaec2000/Kconfig"
 551
 552 source "arch/arm/mach-realview/Kconfig"
 553
 554 source "arch/arm/mach-at91/Kconfig"
 555
 556 source "arch/arm/plat-mxc/Kconfig"
 557
 558 source "arch/arm/mach-netx/Kconfig"
 559
 560 source "arch/arm/mach-ns9xxx/Kconfig"
 561
 562 source "arch/arm/mach-davinci/Kconfig"
 563
 564 source "arch/arm/mach-ks8695/Kconfig"
 565
 566 source "arch/arm/mach-msm/Kconfig"
 567
 568 # Definitions to make life easier
 569 config ARCH_ACORN
 570         bool
 571
 572 config PLAT_IOP
 573         bool
 574
 575 config PLAT_ORION
 576         bool
 577
 578 source arch/arm/mm/Kconfig
 579
 580 config IWMMXT
 581         bool "Enable iWMMXt support"
 582         depends on CPU_XSCALE || CPU_XSC3
 583         default y if PXA27x || PXA3xx
 584         help
 585           Enable support for iWMMXt context switching at run time if
 586           running on a CPU that supports it.
 587
 588 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 589 config XSCALE_PMU
 590         bool
 591         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 592         default y
 593
 594 if !MMU
 595 source "arch/arm/Kconfig-nommu"
 596 endif
 597
 598 endmenu
 599
 600 source "arch/arm/common/Kconfig"
 601
 602 config FORCE_MAX_ZONEORDER
 603         int
 604         depends on SA1111
 605         default "9"
 606
 607 menu "Bus support"
 608
 609 config ARM_AMBA
 610         bool
 611
 612 config ISA
 613         bool
 614         help
 615           Find out whether you have ISA slots on your motherboard.  ISA is the
 616           name of a bus system, i.e. the way the CPU talks to the other stuff
 617           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 618           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 619           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 620
 621 # Select ISA DMA controller support
 622 config ISA_DMA
 623         bool
 624         select ISA_DMA_API
 625
 626 # Select ISA DMA interface
 627 config ISA_DMA_API
 628         bool
 629
 630 config PCI
 631         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
 632         help
 633           Find out whether you have a PCI motherboard. PCI is the name of a
 634           bus system, i.e. the way the CPU talks to the other stuff inside
 635           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 636           VESA. If you have PCI, say Y, otherwise N.
 637
 638 config PCI_SYSCALL
 639         def_bool PCI
 640
 641 # Select the host bridge type
 642 config PCI_HOST_VIA82C505
 643         bool
 644         depends on PCI && ARCH_SHARK
 645         default y
 646
 647 config PCI_HOST_ITE8152
 648         bool
 649         depends on PCI && MACH_ARMCORE
 650         default y
 651         select DMABOUNCE
 652
 653 source "drivers/pci/Kconfig"
 654
 655 source "drivers/pcmcia/Kconfig"
 656
 657 endmenu
 658
 659 menu "Kernel Features"
 660
 661 source "kernel/time/Kconfig"
 662
 663 config SMP
 664         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 665         depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 666         help
 667           This enables support for systems with more than one CPU. If you have
 668           a system with only one CPU, like most personal computers, say N. If
 669           you have a system with more than one CPU, say Y.
 670
 671           If you say N here, the kernel will run on single and multiprocessor
 672           machines, but will use only one CPU of a multiprocessor machine. If
 673           you say Y here, the kernel will run on many, but not all, single
 674           processor machines. On a single processor machine, the kernel will
 675           run faster if you say N here.
 676
 677           See also <file:Documentation/i386/IO-APIC.txt>,
 678           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 679           <http://www.linuxdoc.org/docs.html#howto>.
 680
 681           If you don't know what to do here, say N.
 682
 683 config NR_CPUS
 684         int "Maximum number of CPUs (2-32)"
 685         range 2 32
 686         depends on SMP
 687         default "4"
 688
 689 config HOTPLUG_CPU
 690         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 691         depends on SMP && HOTPLUG && EXPERIMENTAL
 692         help
 693           Say Y here to experiment with turning CPUs off and on.  CPUs
 694           can be controlled through /sys/devices/system/cpu.
 695
 696 config LOCAL_TIMERS
 697         bool "Use local timer interrupts"
 698         depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 699         default y
 700         help
 701           Enable support for local timers on SMP platforms, rather then the
 702           legacy IPI broadcast method.  Local timers allows the system
 703           accounting to be spread across the timer interval, preventing a
 704           "thundering herd" at every timer tick.
 705
 706 config PREEMPT
 707         bool "Preemptible Kernel (EXPERIMENTAL)"
 708         depends on EXPERIMENTAL
 709         help
 710           This option reduces the latency of the kernel when reacting to
 711           real-time or interactive events by allowing a low priority process to
 712           be preempted even if it is in kernel mode executing a system call.
 713           This allows applications to run more reliably even when the system is
 714           under load.
 715
 716           Say Y here if you are building a kernel for a desktop, embedded
 717           or real-time system.  Say N if you are unsure.
 718
 719 config NO_IDLE_HZ
 720         bool "Dynamic tick timer"
 721         depends on !GENERIC_CLOCKEVENTS
 722         help
 723           Select this option if you want to disable continuous timer ticks
 724           and have them programmed to occur as required. This option saves
 725           power as the system can remain in idle state for longer.
 726
 727           By default dynamic tick is disabled during the boot, and can be
 728           manually enabled with:
 729
 730             echo 1 > /sys/devices/system/timer/timer0/dyn_tick
 731
 732           Alternatively, if you want dynamic tick automatically enabled
 733           during boot, pass "dyntick=enable" via the kernel command string.
 734
 735           Please note that dynamic tick may affect the accuracy of
 736           timekeeping on some platforms depending on the implementation.
 737           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
 738           to have accurate timekeeping with dynamic tick.
 739
 740 config HZ
 741         int
 742         default 128 if ARCH_L7200
 743         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 744         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 745         default AT91_TIMER_HZ if ARCH_AT91
 746         default 100
 747
 748 config AEABI
 749         bool "Use the ARM EABI to compile the kernel"
 750         help
 751           This option allows for the kernel to be compiled using the latest
 752           ARM ABI (aka EABI).  This is only useful if you are using a user
 753           space environment that is also compiled with EABI.
 754
 755           Since there are major incompatibilities between the legacy ABI and
 756           EABI, especially with regard to structure member alignment, this
 757           option also changes the kernel syscall calling convention to
 758           disambiguate both ABIs and allow for backward compatibility support
 759           (selected with CONFIG_OABI_COMPAT).
 760
 761           To use this you need GCC version 4.0.0 or later.
 762
 763 config OABI_COMPAT
 764         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 765         depends on AEABI && EXPERIMENTAL
 766         default y
 767         help
 768           This option preserves the old syscall interface along with the
 769           new (ARM EABI) one. It also provides a compatibility layer to
 770           intercept syscalls that have structure arguments which layout
 771           in memory differs between the legacy ABI and the new ARM EABI
 772           (only for non "thumb" binaries). This option adds a tiny
 773           overhead to all syscalls and produces a slightly larger kernel.
 774           If you know you'll be using only pure EABI user space then you
 775           can say N here. If this option is not selected and you attempt
 776           to execute a legacy ABI binary then the result will be
 777           UNPREDICTABLE (in fact it can be predicted that it won't work
 778           at all). If in doubt say Y.
 779
 780 config ARCH_DISCONTIGMEM_ENABLE
 781         bool
 782         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 783         help
 784           Say Y to support efficient handling of discontiguous physical memory,
 785           for architectures which are either NUMA (Non-Uniform Memory Access)
 786           or have huge holes in the physical address space for other reasons.
 787           See <file:Documentation/vm/numa> for more.
 788
 789 config ARCH_SPARSEMEM_ENABLE
 790         bool
 791
 792 config ARCH_SELECT_MEMORY_MODEL
 793         bool
 794
 795 config NODES_SHIFT
 796         int
 797         default "4" if ARCH_LH7A40X
 798         default "2"
 799         depends on NEED_MULTIPLE_NODES
 800
 801 source "mm/Kconfig"
 802
 803 config LEDS
 804         bool "Timer and CPU usage LEDs"
 805         depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
 806                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 807                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 808                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 809                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 810                    ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
 811                    ARCH_KS8695 || MACH_RD88F5182
 812         help
 813           If you say Y here, the LEDs on your machine will be used
 814           to provide useful information about your current system status.
 815
 816           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 817           be able to select which LEDs are active using the options below. If
 818           you are compiling a kernel for the EBSA-110 or the LART however, the
 819           red LED will simply flash regularly to indicate that the system is
 820           still functional. It is safe to say Y here if you have a CATS
 821           system, but the driver will do nothing.
 822
 823 config LEDS_TIMER
 824         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 825                             OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 826                             || MACH_OMAP_PERSEUS2
 827         depends on LEDS
 828         depends on !GENERIC_CLOCKEVENTS
 829         default y if ARCH_EBSA110
 830         help
 831           If you say Y here, one of the system LEDs (the green one on the
 832           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 833           will flash regularly to indicate that the system is still
 834           operational. This is mainly useful to kernel hackers who are
 835           debugging unstable kernels.
 836
 837           The LART uses the same LED for both Timer LED and CPU usage LED
 838           functions. You may choose to use both, but the Timer LED function
 839           will overrule the CPU usage LED.
 840
 841 config LEDS_CPU
 842         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 843                         !ARCH_OMAP) \
 844                         || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
 845                         || MACH_OMAP_PERSEUS2
 846         depends on LEDS
 847         help
 848           If you say Y here, the red LED will be used to give a good real
 849           time indication of CPU usage, by lighting whenever the idle task
 850           is not currently executing.
 851
 852           The LART uses the same LED for both Timer LED and CPU usage LED
 853           functions. You may choose to use both, but the Timer LED function
 854           will overrule the CPU usage LED.
 855
 856 config ALIGNMENT_TRAP
 857         bool
 858         depends on CPU_CP15_MMU
 859         default y if !ARCH_EBSA110
 860         help
 861           ARM processors cannot fetch/store information which is not
 862           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 863           address divisible by 4. On 32-bit ARM processors, these non-aligned
 864           fetch/store instructions will be emulated in software if you say
 865           here, which has a severe performance impact. This is necessary for
 866           correct operation of some network protocols. With an IP-only
 867           configuration it is safe to say N, otherwise say Y.
 868
 869 endmenu
 870
 871 menu "Boot options"
 872
 873 # Compressed boot loader in ROM.  Yes, we really want to ask about
 874 # TEXT and BSS so we preserve their values in the config files.
 875 config ZBOOT_ROM_TEXT
 876         hex "Compressed ROM boot loader base address"
 877         default "0"
 878         help
 879           The physical address at which the ROM-able zImage is to be
 880           placed in the target.  Platforms which normally make use of
 881           ROM-able zImage formats normally set this to a suitable
 882           value in their defconfig file.
 883
 884           If ZBOOT_ROM is not enabled, this has no effect.
 885
 886 config ZBOOT_ROM_BSS
 887         hex "Compressed ROM boot loader BSS address"
 888         default "0"
 889         help
 890           The base address of an area of read/write memory in the target
 891           for the ROM-able zImage which must be available while the
 892           decompressor is running. It must be large enough to hold the
 893           entire decompressed kernel plus an additional 128 KiB.
 894           Platforms which normally make use of ROM-able zImage formats
 895           normally set this to a suitable value in their defconfig file.
 896
 897           If ZBOOT_ROM is not enabled, this has no effect.
 898
 899 config ZBOOT_ROM
 900         bool "Compressed boot loader in ROM/flash"
 901         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 902         help
 903           Say Y here if you intend to execute your compressed kernel image
 904           (zImage) directly from ROM or flash.  If unsure, say N.
 905
 906 config CMDLINE
 907         string "Default kernel command string"
 908         default ""
 909         help
 910           On some architectures (EBSA110 and CATS), there is currently no way
 911           for the boot loader to pass arguments to the kernel. For these
 912           architectures, you should supply some command-line options at build
 913           time by entering them here. As a minimum, you should specify the
 914           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 915
 916 config XIP_KERNEL
 917         bool "Kernel Execute-In-Place from ROM"
 918         depends on !ZBOOT_ROM
 919         help
 920           Execute-In-Place allows the kernel to run from non-volatile storage
 921           directly addressable by the CPU, such as NOR flash. This saves RAM
 922           space since the text section of the kernel is not loaded from flash
 923           to RAM.  Read-write sections, such as the data section and stack,
 924           are still copied to RAM.  The XIP kernel is not compressed since
 925           it has to run directly from flash, so it will take more space to
 926           store it.  The flash address used to link the kernel object files,
 927           and for storing it, is configuration dependent. Therefore, if you
 928           say Y here, you must know the proper physical address where to
 929           store the kernel image depending on your own flash memory usage.
 930
 931           Also note that the make target becomes "make xipImage" rather than
 932           "make zImage" or "make Image".  The final kernel binary to put in
 933           ROM memory will be arch/arm/boot/xipImage.
 934
 935           If unsure, say N.
 936
 937 config XIP_PHYS_ADDR
 938         hex "XIP Kernel Physical Location"
 939         depends on XIP_KERNEL
 940         default "0x00080000"
 941         help
 942           This is the physical address in your flash memory the kernel will
 943           be linked for and stored to.  This address is dependent on your
 944           own flash usage.
 945
 946 config KEXEC
 947         bool "Kexec system call (EXPERIMENTAL)"
 948         depends on EXPERIMENTAL
 949         help
 950           kexec is a system call that implements the ability to shutdown your
 951           current kernel, and to start another kernel.  It is like a reboot
 952           but it is independent of the system firmware.   And like a reboot
 953           you can start any kernel with it, not just Linux.
 954
 955           It is an ongoing process to be certain the hardware in a machine
 956           is properly shutdown, so do not be surprised if this code does not
 957           initially work for you.  It may help to enable device hotplugging
 958           support.
 959
 960 config ATAGS_PROC
 961         bool "Export atags in procfs"
 962         depends on KEXEC
 963         default y
 964         help
 965           Should the atags used to boot the kernel be exported in an "atags"
 966           file in procfs. Useful with kexec.
 967
 968 endmenu
 969
 970 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
 971
 972 menu "CPU Frequency scaling"
 973
 974 source "drivers/cpufreq/Kconfig"
 975
 976 config CPU_FREQ_SA1100
 977         bool
 978         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 979         default y
 980
 981 config CPU_FREQ_SA1110
 982         bool
 983         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 984         default y
 985
 986 config CPU_FREQ_INTEGRATOR
 987         tristate "CPUfreq driver for ARM Integrator CPUs"
 988         depends on ARCH_INTEGRATOR && CPU_FREQ
 989         default y
 990         help
 991           This enables the CPUfreq driver for ARM Integrator CPUs.
 992
 993           For details, take a look at <file:Documentation/cpu-freq>.
 994
 995           If in doubt, say Y.
 996
 997 config CPU_FREQ_IMX
 998         tristate "CPUfreq driver for i.MX CPUs"
 999         depends on ARCH_IMX && CPU_FREQ
1000         default n
1001         help
1002           This enables the CPUfreq driver for i.MX CPUs.
1003
1004           If in doubt, say N.
1005
1006 config CPU_FREQ_PXA
1007         bool
1008         depends on CPU_FREQ && ARCH_PXA && PXA25x
1009         default y
1010         select CPU_FREQ_DEFAULT_GOV_USERSPACE
1011
1012 endmenu
1013
1014 endif
1015
1016 menu "Floating point emulation"
1017
1018 comment "At least one emulation must be selected"
1019
1020 config FPE_NWFPE
1021         bool "NWFPE math emulation"
1022         depends on !AEABI || OABI_COMPAT
1023         ---help---
1024           Say Y to include the NWFPE floating point emulator in the kernel.
1025           This is necessary to run most binaries. Linux does not currently
1026           support floating point hardware so you need to say Y here even if
1027           your machine has an FPA or floating point co-processor podule.
1028
1029           You may say N here if you are going to load the Acorn FPEmulator
1030           early in the bootup.
1031
1032 config FPE_NWFPE_XP
1033         bool "Support extended precision"
1034         depends on FPE_NWFPE
1035         help
1036           Say Y to include 80-bit support in the kernel floating-point
1037           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
1038           Note that gcc does not generate 80-bit operations by default,
1039           so in most cases this option only enlarges the size of the
1040           floating point emulator without any good reason.
1041
1042           You almost surely want to say N here.
1043
1044 config FPE_FASTFPE
1045         bool "FastFPE math emulation (EXPERIMENTAL)"
1046         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1047         ---help---
1048           Say Y here to include the FAST floating point emulator in the kernel.
1049           This is an experimental much faster emulator which now also has full
1050           precision for the mantissa.  It does not support any exceptions.
1051           It is very simple, and approximately 3-6 times faster than NWFPE.
1052
1053           It should be sufficient for most programs.  It may be not suitable
1054           for scientific calculations, but you have to check this for yourself.
1055           If you do not feel you need a faster FP emulation you should better
1056           choose NWFPE.
1057
1058 config VFP
1059         bool "VFP-format floating point maths"
1060         depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1061         help
1062           Say Y to include VFP support code in the kernel. This is needed
1063           if your hardware includes a VFP unit.
1064
1065           Please see <file:Documentation/arm/VFP/release-notes.txt> for
1066           release notes and additional status information.
1067
1068           Say N if your target does not have VFP hardware.
1069
1070 config VFPv3
1071         bool
1072         depends on VFP
1073         default y if CPU_V7
1074
1075 config NEON
1076         bool "Advanced SIMD (NEON) Extension support"
1077         depends on VFPv3 && CPU_V7
1078         help
1079           Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1080           Extension.
1081
1082 endmenu
1083
1084 menu "Userspace binary formats"
1085
1086 source "fs/Kconfig.binfmt"
1087
1088 config ARTHUR
1089         tristate "RISC OS personality"
1090         depends on !AEABI
1091         help
1092           Say Y here to include the kernel code necessary if you want to run
1093           Acorn RISC OS/Arthur binaries under Linux. This code is still very
1094           experimental; if this sounds frightening, say N and sleep in peace.
1095           You can also say M here to compile this support as a module (which
1096           will be called arthur).
1097
1098 endmenu
1099
1100 menu "Power management options"
1101
1102 source "kernel/power/Kconfig"
1103
1104 config ARCH_SUSPEND_POSSIBLE
1105         def_bool y
1106
1107 endmenu
1108
1109 source "net/Kconfig"
1110
1111 menu "Device Drivers"
1112
1113 source "drivers/base/Kconfig"
1114
1115 source "drivers/connector/Kconfig"
1116
1117 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1118 source "drivers/mtd/Kconfig"
1119 endif
1120
1121 source "drivers/parport/Kconfig"
1122
1123 source "drivers/pnp/Kconfig"
1124
1125 source "drivers/block/Kconfig"
1126
1127 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1128
1129 source "drivers/misc/Kconfig"
1130
1131 source "drivers/ide/Kconfig"
1132
1133 source "drivers/scsi/Kconfig"
1134
1135 source "drivers/ata/Kconfig"
1136
1137 source "drivers/md/Kconfig"
1138
1139 source "drivers/message/fusion/Kconfig"
1140
1141 source "drivers/ieee1394/Kconfig"
1142
1143 source "drivers/message/i2o/Kconfig"
1144
1145 source "drivers/net/Kconfig"
1146
1147 source "drivers/isdn/Kconfig"
1148
1149 # input before char - char/joystick depends on it. As does USB.
1150
1151 source "drivers/input/Kconfig"
1152
1153 source "drivers/char/Kconfig"
1154
1155 source "drivers/i2c/Kconfig"
1156
1157 source "drivers/spi/Kconfig"
1158
1159 source "drivers/gpio/Kconfig"
1160
1161 source "drivers/w1/Kconfig"
1162
1163 source "drivers/power/Kconfig"
1164
1165 source "drivers/hwmon/Kconfig"
1166
1167 source "drivers/watchdog/Kconfig"
1168
1169 source "drivers/ssb/Kconfig"
1170
1171 #source "drivers/l3/Kconfig"
1172
1173 source "drivers/mfd/Kconfig"
1174
1175 source "drivers/media/Kconfig"
1176
1177 source "drivers/video/Kconfig"
1178
1179 source "sound/Kconfig"
1180
1181 source "drivers/hid/Kconfig"
1182
1183 source "drivers/usb/Kconfig"
1184
1185 source "drivers/mmc/Kconfig"
1186
1187 source "drivers/leds/Kconfig"
1188
1189 source "drivers/rtc/Kconfig"
1190
1191 source "drivers/dma/Kconfig"
1192
1193 source "drivers/dca/Kconfig"
1194
1195 source "drivers/uio/Kconfig"
1196
1197 endmenu
1198
1199 source "fs/Kconfig"
1200
1201 source "arch/arm/Kconfig.debug"
1202
1203 source "security/Kconfig"
1204
1205 source "crypto/Kconfig"
1206
1207 source "lib/Kconfig"