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 PPC_PM_NEEDS_RTC_LIB
  15         bool
  16         select RTC_LIB
  17         default y if PM
  18
  19 config PPC32
  20         bool
  21         default y if !PPC64
  22
  23 config 64BIT
  24         bool
  25         default y if PPC64
  26
  27 config PPC_MERGE
  28         def_bool y
  29
  30 config MMU
  31         bool
  32         default y
  33
  34 config GENERIC_HARDIRQS
  35         bool
  36         default y
  37
  38 config IRQ_PER_CPU
  39         bool
  40         default y
  41
  42 config RWSEM_GENERIC_SPINLOCK
  43         bool
  44
  45 config RWSEM_XCHGADD_ALGORITHM
  46         bool
  47         default y
  48
  49 config ARCH_HAS_ILOG2_U32
  50         bool
  51         default y
  52
  53 config ARCH_HAS_ILOG2_U64
  54         bool
  55         default y if 64BIT
  56
  57 config GENERIC_HWEIGHT
  58         bool
  59         default y
  60
  61 config GENERIC_CALIBRATE_DELAY
  62         bool
  63         default y
  64
  65 config GENERIC_FIND_NEXT_BIT
  66         bool
  67         default y
  68
  69 config PPC
  70         bool
  71         default y
  72
  73 config EARLY_PRINTK
  74         bool
  75         default y
  76
  77 config COMPAT
  78         bool
  79         default y if PPC64
  80
  81 config SYSVIPC_COMPAT
  82         bool
  83         depends on COMPAT && SYSVIPC
  84         default y
  85
  86 # All PPC32s use generic nvram driver through ppc_md
  87 config GENERIC_NVRAM
  88         bool
  89         default y if PPC32
  90
  91 config SCHED_NO_NO_OMIT_FRAME_POINTER
  92         bool
  93         default y
  94
  95 config ARCH_MAY_HAVE_PC_FDC
  96         bool
  97         default !PPC_PSERIES || PCI
  98
  99 config PPC_OF
 100         def_bool y
 101
 102 config PPC_UDBG_16550
 103         bool
 104         default n
 105
 106 config GENERIC_TBSYNC
 107         bool
 108         default y if PPC32 && SMP
 109         default n
 110
 111 config AUDIT_ARCH
 112         bool
 113         default y
 114
 115 config GENERIC_BUG
 116         bool
 117         default y
 118         depends on BUG
 119
 120 config SYS_SUPPORTS_APM_EMULATION
 121         bool
 122
 123 config DEFAULT_UIMAGE
 124         bool
 125         help
 126           Used to allow a board to specify it wants a uImage built by default
 127         default n
 128
 129 config PPC64_SWSUSP
 130         bool
 131         depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
 132         default y
 133
 134 menu "Processor support"
 135 choice
 136         prompt "Processor Type"
 137         depends on PPC32
 138         default 6xx
 139
 140 config CLASSIC32
 141         bool "52xx/6xx/7xx/74xx"
 142         select PPC_FPU
 143         select 6xx
 144         help
 145           There are four families of PowerPC chips supported.  The more common
 146           types (601, 603, 604, 740, 750, 7400), the Motorola embedded
 147           versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
 148           embedded versions (403 and 405) and the high end 64 bit Power
 149           processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
 150
 151           This option is the catch-all for 6xx types, including some of the
 152           embedded versions.  Unless there is see an option for the specific
 153           chip family you are using, you want this option.
 154
 155           You do not want this if you are building a kernel for a 64 bit
 156           IBM RS/6000 or an Apple G5, choose 6xx.
 157
 158           If unsure, select this option
 159
 160           Note that the kernel runs in 32-bit mode even on 64-bit chips.
 161
 162 config PPC_82xx
 163         bool "Freescale 82xx"
 164         select 6xx
 165         select PPC_FPU
 166
 167 config PPC_83xx
 168         bool "Freescale 83xx"
 169         select 6xx
 170         select FSL_SOC
 171         select 83xx
 172         select PPC_FPU
 173         select WANT_DEVICE_TREE
 174
 175 config PPC_85xx
 176         bool "Freescale 85xx"
 177         select E500
 178         select FSL_SOC
 179         select 85xx
 180         select WANT_DEVICE_TREE
 181
 182 config PPC_86xx
 183         bool "Freescale 86xx"
 184         select 6xx
 185         select FSL_SOC
 186         select FSL_PCIE
 187         select PPC_FPU
 188         select ALTIVEC
 189         help
 190           The Freescale E600 SoCs have 74xx cores.
 191
 192 config PPC_8xx
 193         bool "Freescale 8xx"
 194         select FSL_SOC
 195         select 8xx
 196
 197 config 40x
 198         bool "AMCC 40x"
 199         select PPC_DCR_NATIVE
 200
 201 config 44x
 202         bool "AMCC 44x"
 203         select PPC_DCR_NATIVE
 204         select WANT_DEVICE_TREE
 205
 206 config E200
 207         bool "Freescale e200"
 208
 209 endchoice
 210
 211 config POWER4_ONLY
 212         bool "Optimize for POWER4"
 213         depends on PPC64
 214         default n
 215         ---help---
 216           Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
 217           The resulting binary will not work on POWER3 or RS64 processors
 218           when compiled with binutils 2.15 or later.
 219
 220 config POWER3
 221         bool
 222         depends on PPC64
 223         default y if !POWER4_ONLY
 224
 225 config POWER4
 226         depends on PPC64
 227         def_bool y
 228
 229 config 6xx
 230         bool
 231
 232 # this is temp to handle compat with arch=ppc
 233 config 8xx
 234         bool
 235
 236 # this is temp to handle compat with arch=ppc
 237 config 83xx
 238         bool
 239
 240 # this is temp to handle compat with arch=ppc
 241 config 85xx
 242         bool
 243
 244 config E500
 245         bool
 246
 247 config PPC_FPU
 248         bool
 249         default y if PPC64
 250
 251 config PPC_DCR_NATIVE
 252         bool
 253         default n
 254
 255 config PPC_DCR_MMIO
 256         bool
 257         default n
 258
 259 config PPC_DCR
 260         bool
 261         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 262         default y
 263
 264 config PPC_OF_PLATFORM_PCI
 265         bool
 266         depends on PPC64 # not supported on 32 bits yet
 267         default n
 268
 269 config 4xx
 270         bool
 271         depends on 40x || 44x
 272         default y
 273
 274 config BOOKE
 275         bool
 276         depends on E200 || E500 || 44x
 277         default y
 278
 279 config FSL_BOOKE
 280         bool
 281         depends on E200 || E500
 282         default y
 283
 284 config PTE_64BIT
 285         bool
 286         depends on 44x || E500
 287         default y if 44x
 288         default y if E500 && PHYS_64BIT
 289
 290 config PHYS_64BIT
 291         bool 'Large physical address support' if E500
 292         depends on 44x || E500
 293         select RESOURCES_64BIT
 294         default y if 44x
 295         ---help---
 296           This option enables kernel support for larger than 32-bit physical
 297           addresses.  This features is not be available on all e500 cores.
 298
 299           If in doubt, say N here.
 300
 301 config ALTIVEC
 302         bool "AltiVec Support"
 303         depends on CLASSIC32 || POWER4
 304         ---help---
 305           This option enables kernel support for the Altivec extensions to the
 306           PowerPC processor. The kernel currently supports saving and restoring
 307           altivec registers, and turning on the 'altivec enable' bit so user
 308           processes can execute altivec instructions.
 309
 310           This option is only usefully if you have a processor that supports
 311           altivec (G4, otherwise known as 74xx series), but does not have
 312           any affect on a non-altivec cpu (it does, however add code to the
 313           kernel).
 314
 315           If in doubt, say Y here.
 316
 317 config SPE
 318         bool "SPE Support"
 319         depends on E200 || E500
 320         default y
 321         ---help---
 322           This option enables kernel support for the Signal Processing
 323           Extensions (SPE) to the PowerPC processor. The kernel currently
 324           supports saving and restoring SPE registers, and turning on the
 325           'spe enable' bit so user processes can execute SPE instructions.
 326
 327           This option is only useful if you have a processor that supports
 328           SPE (e500, otherwise known as 85xx series), but does not have any
 329           effect on a non-spe cpu (it does, however add code to the kernel).
 330
 331           If in doubt, say Y here.
 332
 333 config PPC_STD_MMU
 334         bool
 335         depends on 6xx || POWER3 || POWER4 || PPC64
 336         default y
 337
 338 config PPC_STD_MMU_32
 339         def_bool y
 340         depends on PPC_STD_MMU && PPC32
 341
 342 config PPC_MM_SLICES
 343         bool
 344         default y if HUGETLB_PAGE
 345         default n
 346
 347 config VIRT_CPU_ACCOUNTING
 348         bool "Deterministic task and CPU time accounting"
 349         depends on PPC64
 350         default y
 351         help
 352           Select this option to enable more accurate task and CPU time
 353           accounting.  This is done by reading a CPU counter on each
 354           kernel entry and exit and on transitions within the kernel
 355           between system, softirq and hardirq state, so there is a
 356           small performance impact.  This also enables accounting of
 357           stolen time on logically-partitioned systems running on
 358           IBM POWER5-based machines.
 359
 360           If in doubt, say Y here.
 361
 362 config SMP
 363         depends on PPC_STD_MMU
 364         bool "Symmetric multi-processing support"
 365         ---help---
 366           This enables support for systems with more than one CPU. If you have
 367           a system with only one CPU, say N. If you have a system with more
 368           than one CPU, say Y.  Note that the kernel does not currently
 369           support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
 370           since they have inadequate hardware support for multiprocessor
 371           operation.
 372
 373           If you say N here, the kernel will run on single and multiprocessor
 374           machines, but will use only one CPU of a multiprocessor machine. If
 375           you say Y here, the kernel will run on single-processor machines.
 376           On a single-processor machine, the kernel will run faster if you say
 377           N here.
 378
 379           If you don't know what to do here, say N.
 380
 381 config NR_CPUS
 382         int "Maximum number of CPUs (2-128)"
 383         range 2 128
 384         depends on SMP
 385         default "32" if PPC64
 386         default "4"
 387
 388 config NOT_COHERENT_CACHE
 389         bool
 390         depends on 4xx || 8xx || E200
 391         default y
 392 endmenu
 393
 394 source "init/Kconfig"
 395
 396 source "arch/powerpc/platforms/Kconfig"
 397
 398 menu "Kernel options"
 399
 400 config HIGHMEM
 401         bool "High memory support"
 402         depends on PPC32
 403
 404 source kernel/Kconfig.hz
 405 source kernel/Kconfig.preempt
 406 source "fs/Kconfig.binfmt"
 407
 408 # We optimistically allocate largepages from the VM, so make the limit
 409 # large enough (16MB). This badly named config option is actually
 410 # max order + 1
 411 config FORCE_MAX_ZONEORDER
 412         int
 413         depends on PPC64
 414         default "9" if PPC_64K_PAGES
 415         default "13"
 416
 417 config MATH_EMULATION
 418         bool "Math emulation"
 419         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 420         ---help---
 421           Some PowerPC chips designed for embedded applications do not have
 422           a floating-point unit and therefore do not implement the
 423           floating-point instructions in the PowerPC instruction set.  If you
 424           say Y here, the kernel will include code to emulate a floating-point
 425           unit, which will allow programs that use floating-point
 426           instructions to run.
 427
 428 config IOMMU_VMERGE
 429         bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
 430         depends on EXPERIMENTAL && PPC64
 431         default n
 432         help
 433           Cause IO segments sent to a device for DMA to be merged virtually
 434           by the IOMMU when they happen to have been allocated contiguously.
 435           This doesn't add pressure to the IOMMU allocator. However, some
 436           drivers don't support getting large merged segments coming back
 437           from *_map_sg(). Say Y if you know the drivers you are using are
 438           properly handling this case.
 439
 440 config HOTPLUG_CPU
 441         bool "Support for enabling/disabling CPUs"
 442         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 443         ---help---
 444           Say Y here to be able to disable and re-enable individual
 445           CPUs at runtime on SMP machines.
 446
 447           Say N if you are unsure.
 448
 449 config ARCH_ENABLE_MEMORY_HOTPLUG
 450         def_bool y
 451
 452 config KEXEC
 453         bool "kexec system call (EXPERIMENTAL)"
 454         depends on PPC_MULTIPLATFORM && EXPERIMENTAL
 455         help
 456           kexec is a system call that implements the ability to shutdown your
 457           current kernel, and to start another kernel.  It is like a reboot
 458           but it is independent of the system firmware.   And like a reboot
 459           you can start any kernel with it, not just Linux.
 460
 461           The name comes from the similarity to the exec system call.
 462
 463           It is an ongoing process to be certain the hardware in a machine
 464           is properly shutdown, so do not be surprised if this code does not
 465           initially work for you.  It may help to enable device hotplugging
 466           support.  As of this writing the exact hardware interface is
 467           strongly in flux, so no good recommendation can be made.
 468
 469 config CRASH_DUMP
 470         bool "Build a kdump crash kernel (EXPERIMENTAL)"
 471         depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
 472         help
 473           Build a kernel suitable for use as a kdump capture kernel.
 474           The kernel will be linked at a different address than normal, and
 475           so can only be used for Kdump.
 476
 477           Don't change this unless you know what you are doing.
 478
 479 config PPCBUG_NVRAM
 480         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 481         default y if PPC_PREP
 482
 483 config IRQ_ALL_CPUS
 484         bool "Distribute interrupts on all CPUs by default"
 485         depends on SMP && !MV64360
 486         help
 487           This option gives the kernel permission to distribute IRQs across
 488           multiple CPUs.  Saying N here will route all IRQs to the first
 489           CPU.  Generally saying Y is safe, although some problems have been
 490           reported with SMP Power Macintoshes with this option enabled.
 491
 492 config NUMA
 493         bool "NUMA support"
 494         depends on PPC64
 495         default y if SMP && PPC_PSERIES
 496
 497 config NODES_SHIFT
 498         int
 499         default "4"
 500         depends on NEED_MULTIPLE_NODES
 501
 502 config ARCH_SELECT_MEMORY_MODEL
 503         def_bool y
 504         depends on PPC64
 505
 506 config ARCH_FLATMEM_ENABLE
 507         def_bool y
 508         depends on (PPC64 && !NUMA) || PPC32
 509
 510 config ARCH_SPARSEMEM_ENABLE
 511         def_bool y
 512         depends on PPC64
 513
 514 config ARCH_SPARSEMEM_DEFAULT
 515         def_bool y
 516         depends on (SMP && PPC_PSERIES) || PPC_PS3
 517
 518 config ARCH_POPULATES_NODE_MAP
 519         def_bool y
 520
 521 source "mm/Kconfig"
 522
 523 config ARCH_MEMORY_PROBE
 524         def_bool y
 525         depends on MEMORY_HOTPLUG
 526
 527 # Some NUMA nodes have memory ranges that span
 528 # other nodes.  Even though a pfn is valid and
 529 # between a node's start and end pfns, it may not
 530 # reside on that node.  See memmap_init_zone()
 531 # for details.
 532 config NODES_SPAN_OTHER_NODES
 533         def_bool y
 534         depends on NEED_MULTIPLE_NODES
 535
 536 config PPC_HAS_HASH_64K
 537         bool
 538         depends on PPC64
 539         default n
 540
 541 config PPC_64K_PAGES
 542         bool "64k page size"
 543         depends on PPC64
 544         select PPC_HAS_HASH_64K
 545         help
 546           This option changes the kernel logical page size to 64k. On machines
 547           without processor support for 64k pages, the kernel will simulate
 548           them by loading each individual 4k page on demand transparently,
 549           while on hardware with such support, it will be used to map
 550           normal application pages.
 551
 552 config SCHED_SMT
 553         bool "SMT (Hyperthreading) scheduler support"
 554         depends on PPC64 && SMP
 555         help
 556           SMT scheduler support improves the CPU scheduler's decision making
 557           when dealing with POWER5 cpus at a cost of slightly increased
 558           overhead in some places. If unsure say N here.
 559
 560 config PROC_DEVICETREE
 561         bool "Support for device tree in /proc"
 562         depends on PROC_FS
 563         help
 564           This option adds a device-tree directory under /proc which contains
 565           an image of the device tree that the kernel copies from Open
 566           Firmware or other boot firmware. If unsure, say Y here.
 567
 568 config CMDLINE_BOOL
 569         bool "Default bootloader kernel arguments"
 570
 571 config CMDLINE
 572         string "Initial kernel command string"
 573         depends on CMDLINE_BOOL
 574         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 575         help
 576           On some platforms, there is currently no way for the boot loader to
 577           pass arguments to the kernel. For these platforms, you can supply
 578           some command-line options at build time by entering them here.  In
 579           most cases you will need to specify the root device here.
 580
 581 if !44x || BROKEN
 582 source kernel/power/Kconfig
 583 endif
 584
 585 config SECCOMP
 586         bool "Enable seccomp to safely compute untrusted bytecode"
 587         depends on PROC_FS
 588         default y
 589         help
 590           This kernel feature is useful for number crunching applications
 591           that may need to compute untrusted bytecode during their
 592           execution. By using pipes or other transports made available to
 593           the process as file descriptors supporting the read/write
 594           syscalls, it's possible to isolate those applications in
 595           their own address space using seccomp. Once seccomp is
 596           enabled via /proc/<pid>/seccomp, it cannot be disabled
 597           and the task is only allowed to execute a few safe syscalls
 598           defined by each seccomp mode.
 599
 600           If unsure, say Y. Only embedded should say N here.
 601
 602 config WANT_DEVICE_TREE
 603         bool
 604         default n
 605
 606 config DEVICE_TREE
 607         string "Static device tree source file"
 608         depends on WANT_DEVICE_TREE
 609         help
 610           This specifies the device tree source (.dts) file to be
 611           compiled and included when building the bootwrapper.  If a
 612           relative filename is given, then it will be relative to
 613           arch/powerpc/boot/dts.  If you are not using the bootwrapper,
 614           or do not need to build a dts into the bootwrapper, this
 615           field is ignored.
 616
 617           For example, this is required when building a cuImage target
 618           for an older U-Boot, which cannot pass a device tree itself.
 619           Such a kernel will not work with a newer U-Boot that tries to
 620           pass a device tree (unless you tell it not to).  If your U-Boot
 621           does not mention a device tree in "help bootm", then use the
 622           cuImage target and specify a device tree here.  Otherwise, use
 623           the uImage target and leave this field blank.
 624
 625 endmenu
 626
 627 config ISA_DMA_API
 628         bool
 629         default y
 630
 631 menu "Bus options"
 632
 633 config ISA
 634         bool "Support for ISA-bus hardware"
 635         depends on PPC_PREP || PPC_CHRP
 636         select PPC_I8259
 637         help
 638           Find out whether you have ISA slots on your motherboard.  ISA is the
 639           name of a bus system, i.e. the way the CPU talks to the other stuff
 640           inside your box.  If you have an Apple machine, say N here; if you
 641           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 642           you have an embedded board, consult your board documentation.
 643
 644 config ZONE_DMA
 645         bool
 646         default y
 647
 648 config GENERIC_ISA_DMA
 649         bool
 650         depends on PPC64 || POWER4 || 6xx && !CPM2
 651         default y
 652
 653 config PPC_INDIRECT_PCI
 654         bool
 655         depends on PCI
 656         default y if 40x || 44x
 657         default n
 658
 659 config PPC_INDIRECT_PCI_BE
 660         bool
 661         depends PPC_INDIRECT_PCI
 662         default n
 663
 664 config EISA
 665         bool
 666
 667 config SBUS
 668         bool
 669
 670 config FSL_SOC
 671         bool
 672
 673 config FSL_PCIE
 674         bool
 675         depends on PPC_86xx
 676
 677 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 678 config MCA
 679         bool
 680
 681 config PCI
 682         bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
 683                 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
 684                 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
 685         default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
 686                 && !PPC_85xx && !PPC_86xx
 687         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
 688         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 689         select ARCH_SUPPORTS_MSI
 690         help
 691           Find out whether your system includes a PCI bus. PCI is the name of
 692           a bus system, i.e. the way the CPU talks to the other stuff inside
 693           your box.  If you say Y here, the kernel will include drivers and
 694           infrastructure code to support PCI bus devices.
 695
 696 config PCI_DOMAINS
 697         bool
 698         default PCI
 699
 700 config PCI_QSPAN
 701         bool "QSpan PCI"
 702         depends on !4xx && !CPM2 && 8xx
 703         select PPC_I8259
 704         help
 705           Say Y here if you have a system based on a Motorola 8xx-series
 706           embedded processor with a QSPAN PCI interface, otherwise say N.
 707
 708 config PCI_8260
 709         bool
 710         depends on PCI && 8260
 711         select PPC_INDIRECT_PCI
 712         default y
 713
 714 config 8260_PCI9
 715         bool "Enable workaround for MPC826x erratum PCI 9"
 716         depends on PCI_8260 && !ADS8272
 717         default y
 718
 719 choice
 720         prompt "IDMA channel for PCI 9 workaround"
 721         depends on 8260_PCI9
 722
 723 config 8260_PCI9_IDMA1
 724         bool "IDMA1"
 725
 726 config 8260_PCI9_IDMA2
 727         bool "IDMA2"
 728
 729 config 8260_PCI9_IDMA3
 730         bool "IDMA3"
 731
 732 config 8260_PCI9_IDMA4
 733         bool "IDMA4"
 734
 735 endchoice
 736
 737 source "drivers/pci/pcie/Kconfig"
 738
 739 source "drivers/pci/Kconfig"
 740
 741 source "drivers/pcmcia/Kconfig"
 742
 743 source "drivers/pci/hotplug/Kconfig"
 744
 745 endmenu
 746
 747 menu "Advanced setup"
 748         depends on PPC32
 749
 750 config ADVANCED_OPTIONS
 751         bool "Prompt for advanced kernel configuration options"
 752         help
 753           This option will enable prompting for a variety of advanced kernel
 754           configuration options.  These options can cause the kernel to not
 755           work if they are set incorrectly, but can be used to optimize certain
 756           aspects of kernel memory management.
 757
 758           Unless you know what you are doing, say N here.
 759
 760 comment "Default settings for advanced configuration options are used"
 761         depends on !ADVANCED_OPTIONS
 762
 763 config HIGHMEM_START_BOOL
 764         bool "Set high memory pool address"
 765         depends on ADVANCED_OPTIONS && HIGHMEM
 766         help
 767           This option allows you to set the base address of the kernel virtual
 768           area used to map high memory pages.  This can be useful in
 769           optimizing the layout of kernel virtual memory.
 770
 771           Say N here unless you know what you are doing.
 772
 773 config HIGHMEM_START
 774         hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
 775         default "0xfe000000"
 776
 777 config LOWMEM_SIZE_BOOL
 778         bool "Set maximum low memory"
 779         depends on ADVANCED_OPTIONS
 780         help
 781           This option allows you to set the maximum amount of memory which
 782           will be used as "low memory", that is, memory which the kernel can
 783           access directly, without having to set up a kernel virtual mapping.
 784           This can be useful in optimizing the layout of kernel virtual
 785           memory.
 786
 787           Say N here unless you know what you are doing.
 788
 789 config LOWMEM_SIZE
 790         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 791         default "0x30000000"
 792
 793 config KERNEL_START_BOOL
 794         bool "Set custom kernel base address"
 795         depends on ADVANCED_OPTIONS
 796         help
 797           This option allows you to set the kernel virtual address at which
 798           the kernel will map low memory (the kernel image will be linked at
 799           this address).  This can be useful in optimizing the virtual memory
 800           layout of the system.
 801
 802           Say N here unless you know what you are doing.
 803
 804 config KERNEL_START
 805         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 806         default "0xc0000000"
 807
 808 config TASK_SIZE_BOOL
 809         bool "Set custom user task size"
 810         depends on ADVANCED_OPTIONS
 811         help
 812           This option allows you to set the amount of virtual address space
 813           allocated to user tasks.  This can be useful in optimizing the
 814           virtual memory layout of the system.
 815
 816           Say N here unless you know what you are doing.
 817
 818 config TASK_SIZE
 819         hex "Size of user task space" if TASK_SIZE_BOOL
 820         default "0x80000000"
 821
 822 config CONSISTENT_START_BOOL
 823         bool "Set custom consistent memory pool address"
 824         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 825         help
 826           This option allows you to set the base virtual address
 827           of the consistent memory pool.  This pool of virtual
 828           memory is used to make consistent memory allocations.
 829
 830 config CONSISTENT_START
 831         hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
 832         default "0xff100000" if NOT_COHERENT_CACHE
 833
 834 config CONSISTENT_SIZE_BOOL
 835         bool "Set custom consistent memory pool size"
 836         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 837         help
 838           This option allows you to set the size of the
 839           consistent memory pool.  This pool of virtual memory
 840           is used to make consistent memory allocations.
 841
 842 config CONSISTENT_SIZE
 843         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 844         default "0x00200000" if NOT_COHERENT_CACHE
 845
 846 config BOOT_LOAD_BOOL
 847         bool "Set the boot link/load address"
 848         depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
 849         help
 850           This option allows you to set the initial load address of the zImage
 851           or zImage.initrd file.  This can be useful if you are on a board
 852           which has a small amount of memory.
 853
 854           Say N here unless you know what you are doing.
 855
 856 config BOOT_LOAD
 857         hex "Link/load address for booting" if BOOT_LOAD_BOOL
 858         default "0x00400000" if 40x || 8xx || 8260
 859         default "0x01000000" if 44x
 860         default "0x00800000"
 861
 862 config PIN_TLB
 863         bool "Pinned Kernel TLBs (860 ONLY)"
 864         depends on ADVANCED_OPTIONS && 8xx
 865 endmenu
 866
 867 if PPC64
 868 config KERNEL_START
 869         hex
 870         default "0xc000000000000000"
 871 endif
 872
 873 source "net/Kconfig"
 874
 875 source "drivers/Kconfig"
 876
 877 source "fs/Kconfig"
 878
 879 # XXX source "arch/ppc/8xx_io/Kconfig"
 880
 881 # XXX source "arch/ppc/8260_io/Kconfig"
 882
 883 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 884
 885 source "lib/Kconfig"
 886
 887 menu "Instrumentation Support"
 888         depends on EXPERIMENTAL
 889
 890 source "arch/powerpc/oprofile/Kconfig"
 891
 892 config KPROBES
 893         bool "Kprobes (EXPERIMENTAL)"
 894         depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
 895         help
 896           Kprobes allows you to trap at almost any kernel address and
 897           execute a callback function.  register_kprobe() establishes
 898           a probepoint and specifies the callback.  Kprobes is useful
 899           for kernel debugging, non-intrusive instrumentation and testing.
 900           If in doubt, say "N".
 901 endmenu
 902
 903 source "arch/powerpc/Kconfig.debug"
 904
 905 source "security/Kconfig"
 906
 907 config KEYS_COMPAT
 908         bool
 909         depends on COMPAT && KEYS
 910         default y
 911
 912 source "crypto/Kconfig"