arch/powerpc/Kconfig

   1 # For a description of the syntax of this configuration file,
   2 # see Documentation/kbuild/kconfig-language.txt.
   3 #
   4
   5 mainmenu "Linux/PowerPC Kernel Configuration"
   6
   7 config PPC64
   8         bool "64-bit kernel"
   9         default n
  10         help
  11           This option selects whether a 32-bit or a 64-bit kernel
  12           will be built.
  13
  14 config PPC32
  15         bool
  16         default y if !PPC64
  17
  18 config 64BIT
  19         bool
  20         default y if PPC64
  21
  22 config PPC_MERGE
  23         def_bool y
  24
  25 config MMU
  26         bool
  27         default y
  28
  29 config UID16
  30         bool
  31
  32 config GENERIC_HARDIRQS
  33         bool
  34         default y
  35
  36 config RWSEM_GENERIC_SPINLOCK
  37         bool
  38
  39 config RWSEM_XCHGADD_ALGORITHM
  40         bool
  41         default y
  42
  43 config GENERIC_CALIBRATE_DELAY
  44         bool
  45         default y
  46
  47 config PPC
  48         bool
  49         default y
  50
  51 config EARLY_PRINTK
  52         bool
  53         default y if PPC64
  54
  55 config COMPAT
  56         bool
  57         default y if PPC64
  58
  59 config SYSVIPC_COMPAT
  60         bool
  61         depends on COMPAT && SYSVIPC
  62         default y
  63
  64 # All PPC32s use generic nvram driver through ppc_md
  65 config GENERIC_NVRAM
  66         bool
  67         default y if PPC32
  68
  69 config SCHED_NO_NO_OMIT_FRAME_POINTER
  70         bool
  71         default y
  72
  73 config ARCH_MAY_HAVE_PC_FDC
  74         bool
  75         default y
  76
  77 menu "Processor support"
  78 choice
  79         prompt "Processor Type"
  80         depends on PPC32
  81         default 6xx
  82
  83 config 6xx
  84         bool "6xx/7xx/74xx"
  85         select PPC_FPU
  86         help
  87           There are four families of PowerPC chips supported.  The more common
  88           types (601, 603, 604, 740, 750, 7400), the Motorola embedded
  89           versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
  90           embedded versions (403 and 405) and the high end 64 bit Power
  91           processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
  92
  93           Unless you are building a kernel for one of the embedded processor
  94           systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
  95           Note that the kernel runs in 32-bit mode even on 64-bit chips.
  96
  97 config PPC_52xx
  98         bool "Freescale 52xx"
  99
 100 config PPC_82xx
 101         bool "Freescale 82xx"
 102
 103 config PPC_83xx
 104         bool "Freescale 83xx"
 105
 106 config 40x
 107         bool "AMCC 40x"
 108
 109 config 44x
 110         bool "AMCC 44x"
 111
 112 config PPC64BRIDGE
 113         select PPC_FPU
 114         bool "POWER3, POWER4 and PPC970 (G5)"
 115
 116 config 8xx
 117         bool "Freescale 8xx"
 118
 119 config E200
 120         bool "Freescale e200"
 121
 122 config E500
 123         bool "Freescale e500"
 124 endchoice
 125
 126 config POWER4_ONLY
 127         bool "Optimize for POWER4"
 128         depends on PPC64 || PPC64BRIDGE
 129         default n
 130         ---help---
 131           Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
 132           The resulting binary will not work on POWER3 or RS64 processors
 133           when compiled with binutils 2.15 or later.
 134
 135 config POWER3
 136         bool
 137         depends on PPC64 || PPC64BRIDGE
 138         default y if !POWER4_ONLY
 139
 140 config POWER4
 141         depends on PPC64 || PPC64BRIDGE
 142         def_bool y
 143
 144 config PPC_FPU
 145         bool
 146         default y if PPC64
 147
 148 config BOOKE
 149         bool
 150         depends on E200 || E500
 151         default y
 152
 153 config FSL_BOOKE
 154         bool
 155         depends on E200 || E500
 156         default y
 157
 158 config PTE_64BIT
 159         bool
 160         depends on 44x || E500
 161         default y if 44x
 162         default y if E500 && PHYS_64BIT
 163
 164 config PHYS_64BIT
 165         bool 'Large physical address support' if E500
 166         depends on 44x || E500
 167         default y if 44x
 168         ---help---
 169           This option enables kernel support for larger than 32-bit physical
 170           addresses.  This features is not be available on all e500 cores.
 171
 172           If in doubt, say N here.
 173
 174 config ALTIVEC
 175         bool "AltiVec Support"
 176         depends on 6xx || POWER4
 177         ---help---
 178           This option enables kernel support for the Altivec extensions to the
 179           PowerPC processor. The kernel currently supports saving and restoring
 180           altivec registers, and turning on the 'altivec enable' bit so user
 181           processes can execute altivec instructions.
 182
 183           This option is only usefully if you have a processor that supports
 184           altivec (G4, otherwise known as 74xx series), but does not have
 185           any affect on a non-altivec cpu (it does, however add code to the
 186           kernel).
 187
 188           If in doubt, say Y here.
 189
 190 config SPE
 191         bool "SPE Support"
 192         depends on E200 || E500
 193         ---help---
 194           This option enables kernel support for the Signal Processing
 195           Extensions (SPE) to the PowerPC processor. The kernel currently
 196           supports saving and restoring SPE registers, and turning on the
 197           'spe enable' bit so user processes can execute SPE instructions.
 198
 199           This option is only useful if you have a processor that supports
 200           SPE (e500, otherwise known as 85xx series), but does not have any
 201           effect on a non-spe cpu (it does, however add code to the kernel).
 202
 203           If in doubt, say Y here.
 204
 205 config PPC_STD_MMU
 206         bool
 207         depends on 6xx || POWER3 || POWER4 || PPC64
 208         default y
 209
 210 config PPC_STD_MMU_32
 211         def_bool y
 212         depends on PPC_STD_MMU && PPC32
 213
 214 config SMP
 215         depends on PPC_STD_MMU
 216         bool "Symmetric multi-processing support"
 217         ---help---
 218           This enables support for systems with more than one CPU. If you have
 219           a system with only one CPU, say N. If you have a system with more
 220           than one CPU, say Y.  Note that the kernel does not currently
 221           support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
 222           since they have inadequate hardware support for multiprocessor
 223           operation.
 224
 225           If you say N here, the kernel will run on single and multiprocessor
 226           machines, but will use only one CPU of a multiprocessor machine. If
 227           you say Y here, the kernel will run on single-processor machines.
 228           On a single-processor machine, the kernel will run faster if you say
 229           N here.
 230
 231           If you don't know what to do here, say N.
 232
 233 config NR_CPUS
 234         int "Maximum number of CPUs (2-32)"
 235         range 2 128
 236         depends on SMP
 237         default "32" if PPC64
 238         default "4"
 239
 240 config NOT_COHERENT_CACHE
 241         bool
 242         depends on 4xx || 8xx || E200
 243         default y
 244 endmenu
 245
 246 source "init/Kconfig"
 247
 248 menu "Platform support"
 249         depends on PPC64 || 6xx
 250
 251 choice
 252         prompt "Machine type"
 253         default PPC_MULTIPLATFORM
 254
 255 config PPC_MULTIPLATFORM
 256         bool "Generic desktop/server/laptop"
 257         help
 258           Select this option if configuring for an IBM pSeries or
 259           RS/6000 machine, an Apple machine, or a PReP, CHRP,
 260           Maple or Cell-based machine.
 261
 262 config PPC_ISERIES
 263         bool "IBM Legacy iSeries"
 264         depends on PPC64
 265
 266 config EMBEDDED6xx
 267         bool "Embedded 6xx/7xx/7xxx-based board"
 268         depends on PPC32
 269
 270 config APUS
 271         bool "Amiga-APUS"
 272         depends on PPC32 && BROKEN
 273         help
 274           Select APUS if configuring for a PowerUP Amiga.
 275           More information is available at:
 276           <http://linux-apus.sourceforge.net/>.
 277 endchoice
 278
 279 config PPC_PSERIES
 280         depends on PPC_MULTIPLATFORM && PPC64
 281         bool "  IBM pSeries & new (POWER5-based) iSeries"
 282         default y
 283
 284 config PPC_CHRP
 285         bool "  Common Hardware Reference Platform (CHRP) based machines"
 286         depends on PPC_MULTIPLATFORM && PPC32
 287         default y
 288
 289 config PPC_PMAC
 290         bool "  Apple PowerMac based machines"
 291         depends on PPC_MULTIPLATFORM
 292         default y
 293
 294 config PPC_PMAC64
 295         bool
 296         depends on PPC_PMAC && POWER4
 297         default y
 298
 299 config PPC_PREP
 300         bool "  PowerPC Reference Platform (PReP) based machines"
 301         depends on PPC_MULTIPLATFORM && PPC32
 302         default y
 303
 304 config PPC_MAPLE
 305         depends on PPC_MULTIPLATFORM && PPC64
 306         bool "  Maple 970FX Evaluation Board"
 307         select U3_DART
 308         select MPIC_BROKEN_U3
 309         default n
 310         help
 311           This option enables support for the Maple 970FX Evaluation Board.
 312           For more informations, refer to <http://www.970eval.com>
 313
 314 config PPC_BPA
 315         bool "  Broadband Processor Architecture"
 316         depends on PPC_MULTIPLATFORM && PPC64
 317
 318 config PPC_OF
 319         bool
 320         depends on PPC_MULTIPLATFORM    # for now
 321         default y
 322
 323 config XICS
 324         depends on PPC_PSERIES
 325         bool
 326         default y
 327
 328 config U3_DART
 329         bool
 330         depends on PPC_MULTIPLATFORM && PPC64
 331         default n
 332
 333 config MPIC
 334         depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
 335         bool
 336         default y
 337
 338 config MPIC_BROKEN_U3
 339         bool
 340         depends on PPC_MAPLE
 341         default y
 342
 343 config BPA_IIC
 344         depends on PPC_BPA
 345         bool
 346         default y
 347
 348 config IBMVIO
 349         depends on PPC_PSERIES || PPC_ISERIES
 350         bool
 351         default y
 352
 353 source "drivers/cpufreq/Kconfig"
 354
 355 config CPU_FREQ_PMAC
 356         bool "Support for Apple PowerBooks"
 357         depends on CPU_FREQ && ADB_PMU && PPC32
 358         select CPU_FREQ_TABLE
 359         help
 360           This adds support for frequency switching on Apple PowerBooks,
 361           this currently includes some models of iBook & Titanium
 362           PowerBook.
 363
 364 config PPC601_SYNC_FIX
 365         bool "Workarounds for PPC601 bugs"
 366         depends on 6xx && (PPC_PREP || PPC_PMAC)
 367         help
 368           Some versions of the PPC601 (the first PowerPC chip) have bugs which
 369           mean that extra synchronization instructions are required near
 370           certain instructions, typically those that make major changes to the
 371           CPU state.  These extra instructions reduce performance slightly.
 372           If you say N here, these extra instructions will not be included,
 373           resulting in a kernel which will run faster but may not run at all
 374           on some systems with the PPC601 chip.
 375
 376           If in doubt, say Y here.
 377
 378 config TAU
 379         bool "Thermal Management Support"
 380         depends on 6xx
 381         help
 382           G3 and G4 processors have an on-chip temperature sensor called the
 383           'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
 384           temperature within 2-4 degrees Celsius. This option shows the current
 385           on-die temperature in /proc/cpuinfo if the cpu supports it.
 386
 387           Unfortunately, on some chip revisions, this sensor is very inaccurate
 388           and in some cases, does not work at all, so don't assume the cpu
 389           temp is actually what /proc/cpuinfo says it is.
 390
 391 config TAU_INT
 392         bool "Interrupt driven TAU driver (DANGEROUS)"
 393         depends on TAU
 394         ---help---
 395           The TAU supports an interrupt driven mode which causes an interrupt
 396           whenever the temperature goes out of range. This is the fastest way
 397           to get notified the temp has exceeded a range. With this option off,
 398           a timer is used to re-check the temperature periodically.
 399
 400           However, on some cpus it appears that the TAU interrupt hardware
 401           is buggy and can cause a situation which would lead unexplained hard
 402           lockups.
 403
 404           Unless you are extending the TAU driver, or enjoy kernel/hardware
 405           debugging, leave this option off.
 406
 407 config TAU_AVERAGE
 408         bool "Average high and low temp"
 409         depends on TAU
 410         ---help---
 411           The TAU hardware can compare the temperature to an upper and lower
 412           bound.  The default behavior is to show both the upper and lower
 413           bound in /proc/cpuinfo. If the range is large, the temperature is
 414           either changing a lot, or the TAU hardware is broken (likely on some
 415           G4's). If the range is small (around 4 degrees), the temperature is
 416           relatively stable.  If you say Y here, a single temperature value,
 417           halfway between the upper and lower bounds, will be reported in
 418           /proc/cpuinfo.
 419
 420           If in doubt, say N here.
 421 endmenu
 422
 423 source arch/powerpc/platforms/embedded6xx/Kconfig
 424 source arch/powerpc/platforms/4xx/Kconfig
 425 source arch/powerpc/platforms/85xx/Kconfig
 426 source arch/powerpc/platforms/8xx/Kconfig
 427
 428 menu "Kernel options"
 429
 430 config HIGHMEM
 431         bool "High memory support"
 432         depends on PPC32
 433
 434 source kernel/Kconfig.hz
 435 source kernel/Kconfig.preempt
 436 source "fs/Kconfig.binfmt"
 437
 438 # We optimistically allocate largepages from the VM, so make the limit
 439 # large enough (16MB). This badly named config option is actually
 440 # max order + 1
 441 config FORCE_MAX_ZONEORDER
 442         int
 443         depends on PPC64
 444         default "13"
 445
 446 config MATH_EMULATION
 447         bool "Math emulation"
 448         depends on 4xx || 8xx || E200 || E500
 449         ---help---
 450           Some PowerPC chips designed for embedded applications do not have
 451           a floating-point unit and therefore do not implement the
 452           floating-point instructions in the PowerPC instruction set.  If you
 453           say Y here, the kernel will include code to emulate a floating-point
 454           unit, which will allow programs that use floating-point
 455           instructions to run.
 456
 457 config IOMMU_VMERGE
 458         bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
 459         depends on EXPERIMENTAL && PPC64
 460         default n
 461         help
 462           Cause IO segments sent to a device for DMA to be merged virtually
 463           by the IOMMU when they happen to have been allocated contiguously.
 464           This doesn't add pressure to the IOMMU allocator. However, some
 465           drivers don't support getting large merged segments coming back
 466           from *_map_sg(). Say Y if you know the drivers you are using are
 467           properly handling this case.
 468
 469 config HOTPLUG_CPU
 470         bool "Support for enabling/disabling CPUs"
 471         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 472         ---help---
 473           Say Y here to be able to disable and re-enable individual
 474           CPUs at runtime on SMP machines.
 475
 476           Say N if you are unsure.
 477
 478 config KEXEC
 479         bool "kexec system call (EXPERIMENTAL)"
 480         depends on PPC_MULTIPLATFORM && EXPERIMENTAL
 481         help
 482           kexec is a system call that implements the ability to shutdown your
 483           current kernel, and to start another kernel.  It is like a reboot
 484           but it is indepedent of the system firmware.   And like a reboot
 485           you can start any kernel with it, not just Linux.
 486
 487           The name comes from the similiarity to the exec system call.
 488
 489           It is an ongoing process to be certain the hardware in a machine
 490           is properly shutdown, so do not be surprised if this code does not
 491           initially work for you.  It may help to enable device hotplugging
 492           support.  As of this writing the exact hardware interface is
 493           strongly in flux, so no good recommendation can be made.
 494
 495 config EMBEDDEDBOOT
 496         bool
 497         depends on 8xx || 8260
 498         default y
 499
 500 config PC_KEYBOARD
 501         bool "PC PS/2 style Keyboard"
 502         depends on 4xx || CPM2
 503
 504 config PPCBUG_NVRAM
 505         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 506         default y if PPC_PREP
 507
 508 config IRQ_ALL_CPUS
 509         bool "Distribute interrupts on all CPUs by default"
 510         depends on SMP && !MV64360
 511         help
 512           This option gives the kernel permission to distribute IRQs across
 513           multiple CPUs.  Saying N here will route all IRQs to the first
 514           CPU.  Generally saying Y is safe, although some problems have been
 515           reported with SMP Power Macintoshes with this option enabled.
 516
 517 source "arch/powerpc/platforms/pseries/Kconfig"
 518
 519 config ARCH_SELECT_MEMORY_MODEL
 520         def_bool y
 521         depends on PPC64
 522
 523 config ARCH_FLATMEM_ENABLE
 524        def_bool y
 525        depends on PPC64 && !NUMA
 526
 527 config ARCH_DISCONTIGMEM_ENABLE
 528         def_bool y
 529         depends on SMP && PPC_PSERIES
 530
 531 config ARCH_DISCONTIGMEM_DEFAULT
 532         def_bool y
 533         depends on ARCH_DISCONTIGMEM_ENABLE
 534
 535 config ARCH_FLATMEM_ENABLE
 536         def_bool y
 537         depends on PPC64
 538
 539 config ARCH_SPARSEMEM_ENABLE
 540         def_bool y
 541         depends on ARCH_DISCONTIGMEM_ENABLE
 542
 543 source "mm/Kconfig"
 544
 545 config HAVE_ARCH_EARLY_PFN_TO_NID
 546         def_bool y
 547         depends on NEED_MULTIPLE_NODES
 548
 549 # Some NUMA nodes have memory ranges that span
 550 # other nodes.  Even though a pfn is valid and
 551 # between a node's start and end pfns, it may not
 552 # reside on that node.
 553 #
 554 # This is a relatively temporary hack that should
 555 # be able to go away when sparsemem is fully in
 556 # place
 557
 558 config NODES_SPAN_OTHER_NODES
 559         def_bool y
 560         depends on NEED_MULTIPLE_NODES
 561
 562 config NUMA
 563         bool "NUMA support"
 564         default y if DISCONTIGMEM || SPARSEMEM
 565
 566 config SCHED_SMT
 567         bool "SMT (Hyperthreading) scheduler support"
 568         depends on PPC64 && SMP
 569         default off
 570         help
 571           SMT scheduler support improves the CPU scheduler's decision making
 572           when dealing with POWER5 cpus at a cost of slightly increased
 573           overhead in some places. If unsure say N here.
 574
 575 config PROC_DEVICETREE
 576         bool "Support for Open Firmware device tree in /proc"
 577         depends on PPC_OF && PROC_FS
 578         help
 579           This option adds a device-tree directory under /proc which contains
 580           an image of the device tree that the kernel copies from Open
 581           Firmware. If unsure, say Y here.
 582
 583 source "arch/powerpc/platforms/prep/Kconfig"
 584
 585 config CMDLINE_BOOL
 586         bool "Default bootloader kernel arguments"
 587         depends on !PPC_ISERIES
 588
 589 config CMDLINE
 590         string "Initial kernel command string"
 591         depends on CMDLINE_BOOL
 592         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 593         help
 594           On some platforms, there is currently no way for the boot loader to
 595           pass arguments to the kernel. For these platforms, you can supply
 596           some command-line options at build time by entering them here.  In
 597           most cases you will need to specify the root device here.
 598
 599 if !44x || BROKEN
 600 source kernel/power/Kconfig
 601 endif
 602
 603 config SECCOMP
 604         bool "Enable seccomp to safely compute untrusted bytecode"
 605         depends on PROC_FS
 606         default y
 607         help
 608           This kernel feature is useful for number crunching applications
 609           that may need to compute untrusted bytecode during their
 610           execution. By using pipes or other transports made available to
 611           the process as file descriptors supporting the read/write
 612           syscalls, it's possible to isolate those applications in
 613           their own address space using seccomp. Once seccomp is
 614           enabled via /proc/<pid>/seccomp, it cannot be disabled
 615           and the task is only allowed to execute a few safe syscalls
 616           defined by each seccomp mode.
 617
 618           If unsure, say Y. Only embedded should say N here.
 619
 620 endmenu
 621
 622 config ISA_DMA_API
 623         bool
 624         default y
 625
 626 menu "Bus options"
 627
 628 config ISA
 629         bool "Support for ISA-bus hardware"
 630         depends on PPC_PREP || PPC_CHRP
 631         help
 632           Find out whether you have ISA slots on your motherboard.  ISA is the
 633           name of a bus system, i.e. the way the CPU talks to the other stuff
 634           inside your box.  If you have an Apple machine, say N here; if you
 635           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 636           you have an embedded board, consult your board documentation.
 637
 638 config GENERIC_ISA_DMA
 639         bool
 640         depends on PPC64 || POWER4 || 6xx && !CPM2
 641         default y
 642
 643 config EISA
 644         bool
 645
 646 config SBUS
 647         bool
 648
 649 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 650 config MCA
 651         bool
 652
 653 config PCI
 654         bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
 655         default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
 656         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
 657         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 658         help
 659           Find out whether your system includes a PCI bus. PCI is the name of
 660           a bus system, i.e. the way the CPU talks to the other stuff inside
 661           your box.  If you say Y here, the kernel will include drivers and
 662           infrastructure code to support PCI bus devices.
 663
 664 config PCI_DOMAINS
 665         bool
 666         default PCI
 667
 668 config MPC83xx_PCI2
 669         bool "  Supprt for 2nd PCI host controller"
 670         depends on PCI && MPC834x
 671         default y if MPC834x_SYS
 672
 673 config PCI_QSPAN
 674         bool "QSpan PCI"
 675         depends on !4xx && !CPM2 && 8xx
 676         help
 677           Say Y here if you have a system based on a Motorola 8xx-series
 678           embedded processor with a QSPAN PCI interface, otherwise say N.
 679
 680 config PCI_8260
 681         bool
 682         depends on PCI && 8260
 683         default y
 684
 685 config 8260_PCI9
 686         bool "  Enable workaround for MPC826x erratum PCI 9"
 687         depends on PCI_8260 && !ADS8272
 688         default y
 689
 690 choice
 691         prompt "  IDMA channel for PCI 9 workaround"
 692         depends on 8260_PCI9
 693
 694 config 8260_PCI9_IDMA1
 695         bool "IDMA1"
 696
 697 config 8260_PCI9_IDMA2
 698         bool "IDMA2"
 699
 700 config 8260_PCI9_IDMA3
 701         bool "IDMA3"
 702
 703 config 8260_PCI9_IDMA4
 704         bool "IDMA4"
 705
 706 endchoice
 707
 708 source "drivers/pci/Kconfig"
 709
 710 source "drivers/pcmcia/Kconfig"
 711
 712 source "drivers/pci/hotplug/Kconfig"
 713
 714 endmenu
 715
 716 menu "Advanced setup"
 717         depends on PPC32
 718
 719 config ADVANCED_OPTIONS
 720         bool "Prompt for advanced kernel configuration options"
 721         help
 722           This option will enable prompting for a variety of advanced kernel
 723           configuration options.  These options can cause the kernel to not
 724           work if they are set incorrectly, but can be used to optimize certain
 725           aspects of kernel memory management.
 726
 727           Unless you know what you are doing, say N here.
 728
 729 comment "Default settings for advanced configuration options are used"
 730         depends on !ADVANCED_OPTIONS
 731
 732 config HIGHMEM_START_BOOL
 733         bool "Set high memory pool address"
 734         depends on ADVANCED_OPTIONS && HIGHMEM
 735         help
 736           This option allows you to set the base address of the kernel virtual
 737           area used to map high memory pages.  This can be useful in
 738           optimizing the layout of kernel virtual memory.
 739
 740           Say N here unless you know what you are doing.
 741
 742 config HIGHMEM_START
 743         hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
 744         default "0xfe000000"
 745
 746 config LOWMEM_SIZE_BOOL
 747         bool "Set maximum low memory"
 748         depends on ADVANCED_OPTIONS
 749         help
 750           This option allows you to set the maximum amount of memory which
 751           will be used as "low memory", that is, memory which the kernel can
 752           access directly, without having to set up a kernel virtual mapping.
 753           This can be useful in optimizing the layout of kernel virtual
 754           memory.
 755
 756           Say N here unless you know what you are doing.
 757
 758 config LOWMEM_SIZE
 759         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 760         default "0x30000000"
 761
 762 config KERNEL_START_BOOL
 763         bool "Set custom kernel base address"
 764         depends on ADVANCED_OPTIONS
 765         help
 766           This option allows you to set the kernel virtual address at which
 767           the kernel will map low memory (the kernel image will be linked at
 768           this address).  This can be useful in optimizing the virtual memory
 769           layout of the system.
 770
 771           Say N here unless you know what you are doing.
 772
 773 config KERNEL_START
 774         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 775         default "0xc0000000"
 776
 777 config TASK_SIZE_BOOL
 778         bool "Set custom user task size"
 779         depends on ADVANCED_OPTIONS
 780         help
 781           This option allows you to set the amount of virtual address space
 782           allocated to user tasks.  This can be useful in optimizing the
 783           virtual memory layout of the system.
 784
 785           Say N here unless you know what you are doing.
 786
 787 config TASK_SIZE
 788         hex "Size of user task space" if TASK_SIZE_BOOL
 789         default "0x80000000"
 790
 791 config CONSISTENT_START_BOOL
 792         bool "Set custom consistent memory pool address"
 793         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 794         help
 795           This option allows you to set the base virtual address
 796           of the the consistent memory pool.  This pool of virtual
 797           memory is used to make consistent memory allocations.
 798
 799 config CONSISTENT_START
 800         hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
 801         default "0xff100000" if NOT_COHERENT_CACHE
 802
 803 config CONSISTENT_SIZE_BOOL
 804         bool "Set custom consistent memory pool size"
 805         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 806         help
 807           This option allows you to set the size of the the
 808           consistent memory pool.  This pool of virtual memory
 809           is used to make consistent memory allocations.
 810
 811 config CONSISTENT_SIZE
 812         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 813         default "0x00200000" if NOT_COHERENT_CACHE
 814
 815 config BOOT_LOAD_BOOL
 816         bool "Set the boot link/load address"
 817         depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
 818         help
 819           This option allows you to set the initial load address of the zImage
 820           or zImage.initrd file.  This can be useful if you are on a board
 821           which has a small amount of memory.
 822
 823           Say N here unless you know what you are doing.
 824
 825 config BOOT_LOAD
 826         hex "Link/load address for booting" if BOOT_LOAD_BOOL
 827         default "0x00400000" if 40x || 8xx || 8260
 828         default "0x01000000" if 44x
 829         default "0x00800000"
 830
 831 config PIN_TLB
 832         bool "Pinned Kernel TLBs (860 ONLY)"
 833         depends on ADVANCED_OPTIONS && 8xx
 834 endmenu
 835
 836 source "net/Kconfig"
 837
 838 source "drivers/Kconfig"
 839
 840 source "fs/Kconfig"
 841
 842 # XXX source "arch/ppc/8xx_io/Kconfig"
 843
 844 # XXX source "arch/ppc/8260_io/Kconfig"
 845
 846 source "arch/powerpc/platforms/iseries/Kconfig"
 847
 848 source "lib/Kconfig"
 849
 850 source "arch/powerpc/oprofile/Kconfig"
 851
 852 source "arch/powerpc/Kconfig.debug"
 853
 854 source "security/Kconfig"
 855
 856 config KEYS_COMPAT
 857         bool
 858         depends on COMPAT && KEYS
 859         default y
 860
 861 source "crypto/Kconfig"