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 source "arch/powerpc/platforms/Kconfig.cputype"
   8
   9 config PPC32
  10         bool
  11         default y if !PPC64
  12
  13 config 64BIT
  14         bool
  15         default y if PPC64
  16
  17 config WORD_SIZE
  18         int
  19         default 64 if PPC64
  20         default 32 if !PPC64
  21
  22 config ARCH_PHYS_ADDR_T_64BIT
  23        def_bool PPC64 || PHYS_64BIT
  24
  25 config MMU
  26         bool
  27         default y
  28
  29 config GENERIC_CMOS_UPDATE
  30         def_bool y
  31
  32 config GENERIC_TIME
  33         def_bool y
  34
  35 config GENERIC_TIME_VSYSCALL
  36         def_bool y
  37
  38 config GENERIC_CLOCKEVENTS
  39         def_bool y
  40
  41 config GENERIC_HARDIRQS
  42         bool
  43         default y
  44
  45 config GENERIC_HARDIRQS_NO__DO_IRQ
  46         bool
  47         default y
  48
  49 config HAVE_SETUP_PER_CPU_AREA
  50         def_bool PPC64
  51
  52 config IRQ_PER_CPU
  53         bool
  54         default y
  55
  56 config STACKTRACE_SUPPORT
  57         bool
  58         default y
  59
  60 config HAVE_LATENCYTOP_SUPPORT
  61         def_bool y
  62
  63 config TRACE_IRQFLAGS_SUPPORT
  64         bool
  65         depends on PPC64
  66         default y
  67
  68 config LOCKDEP_SUPPORT
  69         bool
  70         default y
  71
  72 config RWSEM_GENERIC_SPINLOCK
  73         bool
  74
  75 config RWSEM_XCHGADD_ALGORITHM
  76         bool
  77         default y
  78
  79 config GENERIC_LOCKBREAK
  80         bool
  81         default y
  82         depends on SMP && PREEMPT
  83
  84 config ARCH_HAS_ILOG2_U32
  85         bool
  86         default y
  87
  88 config ARCH_HAS_ILOG2_U64
  89         bool
  90         default y if 64BIT
  91
  92 config GENERIC_HWEIGHT
  93         bool
  94         default y
  95
  96 config GENERIC_FIND_NEXT_BIT
  97         bool
  98         default y
  99
 100 config GENERIC_GPIO
 101         bool
 102         help
 103           Generic GPIO API support
 104
 105 config ARCH_NO_VIRT_TO_BUS
 106         def_bool PPC64
 107
 108 config PPC
 109         bool
 110         default y
 111         select HAVE_FTRACE_MCOUNT_RECORD
 112         select HAVE_DYNAMIC_FTRACE
 113         select HAVE_FUNCTION_TRACER
 114         select HAVE_FUNCTION_GRAPH_TRACER
 115         select ARCH_WANT_OPTIONAL_GPIOLIB
 116         select HAVE_IDE
 117         select HAVE_IOREMAP_PROT
 118         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 119         select HAVE_KPROBES
 120         select HAVE_ARCH_KGDB
 121         select HAVE_KRETPROBES
 122         select HAVE_ARCH_TRACEHOOK
 123         select HAVE_LMB
 124         select HAVE_DMA_ATTRS if PPC64
 125         select USE_GENERIC_SMP_HELPERS if SMP
 126         select HAVE_OPROFILE
 127         select HAVE_SYSCALL_WRAPPERS if PPC64
 128
 129 config EARLY_PRINTK
 130         bool
 131         default y
 132
 133 config COMPAT
 134         bool
 135         default y if PPC64
 136         select COMPAT_BINFMT_ELF
 137
 138 config SYSVIPC_COMPAT
 139         bool
 140         depends on COMPAT && SYSVIPC
 141         default y
 142
 143 # All PPC32s use generic nvram driver through ppc_md
 144 config GENERIC_NVRAM
 145         bool
 146         default y if PPC32
 147
 148 config SCHED_OMIT_FRAME_POINTER
 149         bool
 150         default y
 151
 152 config ARCH_MAY_HAVE_PC_FDC
 153         bool
 154         default !PPC_PSERIES || PCI
 155
 156 config PPC_OF
 157         def_bool y
 158
 159 config OF
 160         def_bool y
 161
 162 config PPC_UDBG_16550
 163         bool
 164         default n
 165
 166 config GENERIC_TBSYNC
 167         bool
 168         default y if PPC32 && SMP
 169         default n
 170
 171 config AUDIT_ARCH
 172         bool
 173         default y
 174
 175 config GENERIC_BUG
 176         bool
 177         default y
 178         depends on BUG
 179
 180 config SYS_SUPPORTS_APM_EMULATION
 181         default y if PMAC_APM_EMU
 182         bool
 183
 184 config DTC
 185        bool
 186        default y
 187
 188 config DEFAULT_UIMAGE
 189         bool
 190         help
 191           Used to allow a board to specify it wants a uImage built by default
 192         default n
 193
 194 config REDBOOT
 195         bool
 196
 197 config HIBERNATE_32
 198         bool
 199         depends on (PPC_PMAC && !SMP) || BROKEN
 200         default y
 201
 202 config HIBERNATE_64
 203         bool
 204         depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
 205         default y
 206
 207 config ARCH_HIBERNATION_POSSIBLE
 208         bool
 209         depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
 210         default y
 211
 212 config ARCH_SUSPEND_POSSIBLE
 213         def_bool y
 214         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
 215
 216 config PPC_DCR_NATIVE
 217         bool
 218         default n
 219
 220 config PPC_DCR_MMIO
 221         bool
 222         default n
 223
 224 config PPC_DCR
 225         bool
 226         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 227         default y
 228
 229 config PPC_OF_PLATFORM_PCI
 230         bool
 231         depends on PCI
 232         depends on PPC64 # not supported on 32 bits yet
 233         default n
 234
 235 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 236         def_bool y
 237
 238 source "init/Kconfig"
 239
 240 source "kernel/Kconfig.freezer"
 241
 242 source "arch/powerpc/sysdev/Kconfig"
 243 source "arch/powerpc/platforms/Kconfig"
 244
 245 menu "Kernel options"
 246
 247 config HIGHMEM
 248         bool "High memory support"
 249         depends on PPC32
 250
 251 source kernel/time/Kconfig
 252 source kernel/Kconfig.hz
 253 source kernel/Kconfig.preempt
 254 source "fs/Kconfig.binfmt"
 255
 256 config HUGETLB_PAGE_SIZE_VARIABLE
 257         bool
 258         depends on HUGETLB_PAGE
 259         default y
 260
 261 config MATH_EMULATION
 262         bool "Math emulation"
 263         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 264         ---help---
 265           Some PowerPC chips designed for embedded applications do not have
 266           a floating-point unit and therefore do not implement the
 267           floating-point instructions in the PowerPC instruction set.  If you
 268           say Y here, the kernel will include code to emulate a floating-point
 269           unit, which will allow programs that use floating-point
 270           instructions to run.
 271
 272 config 8XX_MINIMAL_FPEMU
 273         bool "Minimal math emulation for 8xx"
 274         depends on 8xx && !MATH_EMULATION
 275         help
 276           Older arch/ppc kernels still emulated a few floating point
 277           instructions such as load and store, even when full math
 278           emulation is disabled.  Say "Y" here if you want to preserve
 279           this behavior.
 280
 281           It is recommended that you build a soft-float userspace instead.
 282
 283 config IOMMU_VMERGE
 284         bool "Enable IOMMU virtual merging"
 285         depends on PPC64
 286         default y
 287         help
 288           Cause IO segments sent to a device for DMA to be merged virtually
 289           by the IOMMU when they happen to have been allocated contiguously.
 290           This doesn't add pressure to the IOMMU allocator. However, some
 291           drivers don't support getting large merged segments coming back
 292           from *_map_sg().
 293
 294           Most drivers don't have this problem; it is safe to say Y here.
 295
 296 config IOMMU_HELPER
 297         def_bool PPC64
 298
 299 config SWIOTLB
 300         bool "SWIOTLB support"
 301         default n
 302         select IOMMU_HELPER
 303         ---help---
 304           Support for IO bounce buffering for systems without an IOMMU.
 305           This allows us to DMA to the full physical address space on
 306           platforms where the size of a physical address is larger
 307           than the bus address.  Not all platforms support this.
 308
 309 config PPC_NEED_DMA_SYNC_OPS
 310         def_bool y
 311         depends on (NOT_COHERENT_CACHE || SWIOTLB)
 312
 313 config HOTPLUG_CPU
 314         bool "Support for enabling/disabling CPUs"
 315         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 316         ---help---
 317           Say Y here to be able to disable and re-enable individual
 318           CPUs at runtime on SMP machines.
 319
 320           Say N if you are unsure.
 321
 322 config ARCH_ENABLE_MEMORY_HOTPLUG
 323         def_bool y
 324
 325 config ARCH_HAS_WALK_MEMORY
 326         def_bool y
 327
 328 config ARCH_ENABLE_MEMORY_HOTREMOVE
 329         def_bool y
 330
 331 config KEXEC
 332         bool "kexec system call (EXPERIMENTAL)"
 333         depends on PPC_BOOK3S && EXPERIMENTAL
 334         help
 335           kexec is a system call that implements the ability to shutdown your
 336           current kernel, and to start another kernel.  It is like a reboot
 337           but it is independent of the system firmware.   And like a reboot
 338           you can start any kernel with it, not just Linux.
 339
 340           The name comes from the similarity to the exec system call.
 341
 342           It is an ongoing process to be certain the hardware in a machine
 343           is properly shutdown, so do not be surprised if this code does not
 344           initially work for you.  It may help to enable device hotplugging
 345           support.  As of this writing the exact hardware interface is
 346           strongly in flux, so no good recommendation can be made.
 347
 348 config CRASH_DUMP
 349         bool "Build a kdump crash kernel"
 350         depends on PPC64 || 6xx
 351         select RELOCATABLE if PPC64
 352         help
 353           Build a kernel suitable for use as a kdump capture kernel.
 354           The same kernel binary can be used as production kernel and dump
 355           capture kernel.
 356
 357 config PHYP_DUMP
 358         bool "Hypervisor-assisted dump (EXPERIMENTAL)"
 359         depends on PPC_PSERIES && EXPERIMENTAL
 360         help
 361           Hypervisor-assisted dump is meant to be a kdump replacement
 362           offering robustness and speed not possible without system
 363           hypervisor assistance.
 364
 365           If unsure, say "N"
 366
 367 config PPCBUG_NVRAM
 368         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 369         default y if PPC_PREP
 370
 371 config IRQ_ALL_CPUS
 372         bool "Distribute interrupts on all CPUs by default"
 373         depends on SMP && !MV64360
 374         help
 375           This option gives the kernel permission to distribute IRQs across
 376           multiple CPUs.  Saying N here will route all IRQs to the first
 377           CPU.  Generally saying Y is safe, although some problems have been
 378           reported with SMP Power Macintoshes with this option enabled.
 379
 380 config NUMA
 381         bool "NUMA support"
 382         depends on PPC64
 383         default y if SMP && PPC_PSERIES
 384
 385 config NODES_SHIFT
 386         int
 387         default "4"
 388         depends on NEED_MULTIPLE_NODES
 389
 390 config ARCH_SELECT_MEMORY_MODEL
 391         def_bool y
 392         depends on PPC64
 393
 394 config ARCH_FLATMEM_ENABLE
 395         def_bool y
 396         depends on (PPC64 && !NUMA) || PPC32
 397
 398 config ARCH_SPARSEMEM_ENABLE
 399         def_bool y
 400         depends on PPC64
 401         select SPARSEMEM_VMEMMAP_ENABLE
 402
 403 config ARCH_SPARSEMEM_DEFAULT
 404         def_bool y
 405         depends on (SMP && PPC_PSERIES) || PPC_PS3
 406
 407 config ARCH_POPULATES_NODE_MAP
 408         def_bool y
 409
 410 source "mm/Kconfig"
 411
 412 config ARCH_MEMORY_PROBE
 413         def_bool y
 414         depends on MEMORY_HOTPLUG
 415
 416 # Some NUMA nodes have memory ranges that span
 417 # other nodes.  Even though a pfn is valid and
 418 # between a node's start and end pfns, it may not
 419 # reside on that node.  See memmap_init_zone()
 420 # for details.
 421 config NODES_SPAN_OTHER_NODES
 422         def_bool y
 423         depends on NEED_MULTIPLE_NODES
 424
 425 config PPC_HAS_HASH_64K
 426         bool
 427         depends on PPC64
 428         default n
 429
 430 config STDBINUTILS
 431         bool "Using standard binutils settings"
 432         depends on 44x
 433         default y
 434         help
 435           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 436           Note, that kernel will be able to run only those applications,
 437           which had been compiled using binutils later than 2.17.50.0.3 with
 438           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 439           the older binutils, you can patch them with a trivial patch, which
 440           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 441
 442 choice
 443         prompt "Page size"
 444         default PPC_4K_PAGES
 445         help
 446           Select the kernel logical page size. Increasing the page size
 447           will reduce software overhead at each page boundary, allow
 448           hardware prefetch mechanisms to be more effective, and allow
 449           larger dma transfers increasing IO efficiency and reducing
 450           overhead. However the utilization of memory will increase.
 451           For example, each cached file will using a multiple of the
 452           page size to hold its contents and the difference between the
 453           end of file and the end of page is wasted.
 454
 455           Some dedicated systems, such as software raid serving with
 456           accelerated calculations, have shown significant increases.
 457
 458           If you configure a 64 bit kernel for 64k pages but the
 459           processor does not support them, then the kernel will simulate
 460           them with 4k pages, loading them on demand, but with the
 461           reduced software overhead and larger internal fragmentation.
 462           For the 32 bit kernel, a large page option will not be offered
 463           unless it is supported by the configured processor.
 464
 465           If unsure, choose 4K_PAGES.
 466
 467 config PPC_4K_PAGES
 468         bool "4k page size"
 469
 470 config PPC_16K_PAGES
 471         bool "16k page size" if 44x
 472
 473 config PPC_64K_PAGES
 474         bool "64k page size" if 44x || PPC_STD_MMU_64
 475         select PPC_HAS_HASH_64K if PPC_STD_MMU_64
 476
 477 config PPC_256K_PAGES
 478         bool "256k page size" if 44x
 479         depends on !STDBINUTILS
 480         help
 481           Make the page size 256k.
 482
 483           As the ELF standard only requires alignment to support page
 484           sizes up to 64k, you will need to compile all of your user
 485           space applications with a non-standard binutils settings
 486           (see the STDBINUTILS description for details).
 487
 488           Say N unless you know what you are doing.
 489
 490 endchoice
 491
 492 config FORCE_MAX_ZONEORDER
 493         int "Maximum zone order"
 494         range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
 495         default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
 496         range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
 497         default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
 498         range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
 499         default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
 500         range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
 501         default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
 502         range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
 503         default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
 504         range 11 64
 505         default "11"
 506         help
 507           The kernel memory allocator divides physically contiguous memory
 508           blocks into "zones", where each zone is a power of two number of
 509           pages.  This option selects the largest power of two that the kernel
 510           keeps in the memory allocator.  If you need to allocate very large
 511           blocks of physically contiguous memory, then you may need to
 512           increase this value.
 513
 514           This config option is actually maximum order plus one. For example,
 515           a value of 11 means that the largest free memory block is 2^10 pages.
 516
 517           The page size is not necessarily 4KB.  For example, on 64-bit
 518           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 519           this in mind when choosing a value for this option.
 520
 521 config PPC_SUBPAGE_PROT
 522         bool "Support setting protections for 4k subpages"
 523         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 524         help
 525           This option adds support for a system call to allow user programs
 526           to set access permissions (read/write, readonly, or no access)
 527           on the 4k subpages of each 64k page.
 528
 529 config SCHED_SMT
 530         bool "SMT (Hyperthreading) scheduler support"
 531         depends on PPC64 && SMP
 532         help
 533           SMT scheduler support improves the CPU scheduler's decision making
 534           when dealing with POWER5 cpus at a cost of slightly increased
 535           overhead in some places. If unsure say N here.
 536
 537 config PROC_DEVICETREE
 538         bool "Support for device tree in /proc"
 539         depends on PROC_FS
 540         help
 541           This option adds a device-tree directory under /proc which contains
 542           an image of the device tree that the kernel copies from Open
 543           Firmware or other boot firmware. If unsure, say Y here.
 544
 545 config CMDLINE_BOOL
 546         bool "Default bootloader kernel arguments"
 547
 548 config CMDLINE
 549         string "Initial kernel command string"
 550         depends on CMDLINE_BOOL
 551         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 552         help
 553           On some platforms, there is currently no way for the boot loader to
 554           pass arguments to the kernel. For these platforms, you can supply
 555           some command-line options at build time by entering them here.  In
 556           most cases you will need to specify the root device here.
 557
 558 config EXTRA_TARGETS
 559         string "Additional default image types"
 560         help
 561           List additional targets to be built by the bootwrapper here (separated
 562           by spaces).  This is useful for targets that depend of device tree
 563           files in the .dts directory.
 564
 565           Targets in this list will be build as part of the default build
 566           target, or when the user does a 'make zImage' or a
 567           'make zImage.initrd'.
 568
 569           If unsure, leave blank
 570
 571 if !44x || BROKEN
 572 config ARCH_WANTS_FREEZER_CONTROL
 573         def_bool y
 574         depends on ADB_PMU
 575
 576 source kernel/power/Kconfig
 577 endif
 578
 579 config SECCOMP
 580         bool "Enable seccomp to safely compute untrusted bytecode"
 581         depends on PROC_FS
 582         default y
 583         help
 584           This kernel feature is useful for number crunching applications
 585           that may need to compute untrusted bytecode during their
 586           execution. By using pipes or other transports made available to
 587           the process as file descriptors supporting the read/write
 588           syscalls, it's possible to isolate those applications in
 589           their own address space using seccomp. Once seccomp is
 590           enabled via /proc/<pid>/seccomp, it cannot be disabled
 591           and the task is only allowed to execute a few safe syscalls
 592           defined by each seccomp mode.
 593
 594           If unsure, say Y. Only embedded should say N here.
 595
 596 endmenu
 597
 598 config ISA_DMA_API
 599         bool
 600         default !PPC_ISERIES || PCI
 601
 602 menu "Bus options"
 603
 604 config ISA
 605         bool "Support for ISA-bus hardware"
 606         depends on PPC_PREP || PPC_CHRP
 607         select PPC_I8259
 608         help
 609           Find out whether you have ISA slots on your motherboard.  ISA is the
 610           name of a bus system, i.e. the way the CPU talks to the other stuff
 611           inside your box.  If you have an Apple machine, say N here; if you
 612           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 613           you have an embedded board, consult your board documentation.
 614
 615 config ZONE_DMA
 616         bool
 617         default y
 618
 619 config GENERIC_ISA_DMA
 620         bool
 621         depends on PPC64 || POWER4 || 6xx && !CPM2
 622         default y
 623
 624 config PPC_INDIRECT_PCI
 625         bool
 626         depends on PCI
 627         default y if 40x || 44x
 628         default n
 629
 630 config EISA
 631         bool
 632
 633 config SBUS
 634         bool
 635
 636 config FSL_SOC
 637         bool
 638
 639 config FSL_PCI
 640         bool
 641         select PPC_INDIRECT_PCI
 642         select PCI_QUIRKS
 643
 644 config 4xx_SOC
 645         bool
 646
 647 config FSL_LBC
 648         bool
 649         help
 650           Freescale Localbus support
 651
 652 config FSL_GTM
 653         bool
 654         depends on PPC_83xx || QUICC_ENGINE || CPM2
 655         help
 656           Freescale General-purpose Timers support
 657
 658 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 659 config MCA
 660         bool
 661
 662 # Platforms that what PCI turned unconditionally just do select PCI
 663 # in their config node.  Platforms that want to choose at config
 664 # time should select PPC_PCI_CHOICE
 665 config PPC_PCI_CHOICE
 666         bool
 667
 668 config PCI
 669         bool "PCI support" if PPC_PCI_CHOICE
 670         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 671                 && !PPC_85xx && !PPC_86xx
 672         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 673         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 674         select ARCH_SUPPORTS_MSI
 675         help
 676           Find out whether your system includes a PCI bus. PCI is the name of
 677           a bus system, i.e. the way the CPU talks to the other stuff inside
 678           your box.  If you say Y here, the kernel will include drivers and
 679           infrastructure code to support PCI bus devices.
 680
 681 config PCI_DOMAINS
 682         def_bool PCI
 683
 684 config PCI_SYSCALL
 685         def_bool PCI
 686
 687 config PCI_QSPAN
 688         bool "QSpan PCI"
 689         depends on !4xx && !CPM2 && 8xx
 690         select PPC_I8259
 691         help
 692           Say Y here if you have a system based on a Motorola 8xx-series
 693           embedded processor with a QSPAN PCI interface, otherwise say N.
 694
 695 config PCI_8260
 696         bool
 697         depends on PCI && 8260
 698         select PPC_INDIRECT_PCI
 699         default y
 700
 701 config 8260_PCI9
 702         bool "Enable workaround for MPC826x erratum PCI 9"
 703         depends on PCI_8260 && !8272
 704         default y
 705
 706 choice
 707         prompt "IDMA channel for PCI 9 workaround"
 708         depends on 8260_PCI9
 709
 710 config 8260_PCI9_IDMA1
 711         bool "IDMA1"
 712
 713 config 8260_PCI9_IDMA2
 714         bool "IDMA2"
 715
 716 config 8260_PCI9_IDMA3
 717         bool "IDMA3"
 718
 719 config 8260_PCI9_IDMA4
 720         bool "IDMA4"
 721
 722 endchoice
 723
 724 source "drivers/pci/pcie/Kconfig"
 725
 726 source "drivers/pci/Kconfig"
 727
 728 source "drivers/pcmcia/Kconfig"
 729
 730 source "drivers/pci/hotplug/Kconfig"
 731
 732 config HAS_RAPIDIO
 733         bool
 734         default n
 735
 736 config RAPIDIO
 737         bool "RapidIO support"
 738         depends on HAS_RAPIDIO
 739         help
 740           If you say Y here, the kernel will include drivers and
 741           infrastructure code to support RapidIO interconnect devices.
 742
 743 source "drivers/rapidio/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 LOWMEM_SIZE_BOOL
 764         bool "Set maximum low memory"
 765         depends on ADVANCED_OPTIONS
 766         help
 767           This option allows you to set the maximum amount of memory which
 768           will be used as "low memory", that is, memory which the kernel can
 769           access directly, without having to set up a kernel virtual mapping.
 770           This can be useful in optimizing the layout of kernel virtual
 771           memory.
 772
 773           Say N here unless you know what you are doing.
 774
 775 config LOWMEM_SIZE
 776         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 777         default "0x30000000"
 778
 779 config LOWMEM_CAM_NUM_BOOL
 780         bool "Set number of CAMs to use to map low memory"
 781         depends on ADVANCED_OPTIONS && FSL_BOOKE
 782         help
 783           This option allows you to set the maximum number of CAM slots that
 784           will be used to map low memory.  There are a limited number of slots
 785           available and even more limited number that will fit in the L1 MMU.
 786           However, using more entries will allow mapping more low memory.  This
 787           can be useful in optimizing the layout of kernel virtual memory.
 788
 789           Say N here unless you know what you are doing.
 790
 791 config LOWMEM_CAM_NUM
 792         depends on FSL_BOOKE
 793         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 794         default 3
 795
 796 config RELOCATABLE
 797         bool "Build a relocatable kernel (EXPERIMENTAL)"
 798         depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 799         help
 800           This builds a kernel image that is capable of running at the
 801           location the kernel is loaded at (some alignment restrictions may
 802           exist).
 803
 804           One use is for the kexec on panic case where the recovery kernel
 805           must live at a different physical address than the primary
 806           kernel.
 807
 808           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 809           it has been loaded at and the compile time physical addresses
 810           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 811           setting can still be useful to bootwrappers that need to know the
 812           load location of the kernel (eg. u-boot/mkimage).
 813
 814 config PAGE_OFFSET_BOOL
 815         bool "Set custom page offset address"
 816         depends on ADVANCED_OPTIONS
 817         help
 818           This option allows you to set the kernel virtual address at which
 819           the kernel will map low memory.  This can be useful in optimizing
 820           the virtual memory layout of the system.
 821
 822           Say N here unless you know what you are doing.
 823
 824 config PAGE_OFFSET
 825         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 826         default "0xc0000000"
 827
 828 config KERNEL_START_BOOL
 829         bool "Set custom kernel base address"
 830         depends on ADVANCED_OPTIONS
 831         help
 832           This option allows you to set the kernel virtual address at which
 833           the kernel will be loaded.  Normally this should match PAGE_OFFSET
 834           however there are times (like kdump) that one might not want them
 835           to be the same.
 836
 837           Say N here unless you know what you are doing.
 838
 839 config KERNEL_START
 840         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 841         default PAGE_OFFSET if PAGE_OFFSET_BOOL
 842         default "0xc2000000" if CRASH_DUMP
 843         default "0xc0000000"
 844
 845 config PHYSICAL_START_BOOL
 846         bool "Set physical address where the kernel is loaded"
 847         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 848         help
 849           This gives the physical address where the kernel is loaded.
 850
 851           Say N here unless you know what you are doing.
 852
 853 config PHYSICAL_START
 854         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
 855         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
 856         default "0x00000000"
 857
 858 config PHYSICAL_ALIGN
 859         hex
 860         default "0x04000000" if FSL_BOOKE
 861         help
 862           This value puts the alignment restrictions on physical address
 863           where kernel is loaded and run from. Kernel is compiled for an
 864           address which meets above alignment restriction.
 865
 866 config TASK_SIZE_BOOL
 867         bool "Set custom user task size"
 868         depends on ADVANCED_OPTIONS
 869         help
 870           This option allows you to set the amount of virtual address space
 871           allocated to user tasks.  This can be useful in optimizing the
 872           virtual memory layout of the system.
 873
 874           Say N here unless you know what you are doing.
 875
 876 config TASK_SIZE
 877         hex "Size of user task space" if TASK_SIZE_BOOL
 878         default "0x80000000" if PPC_PREP || PPC_8xx
 879         default "0xc0000000"
 880
 881 config CONSISTENT_SIZE_BOOL
 882         bool "Set custom consistent memory pool size"
 883         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 884         help
 885           This option allows you to set the size of the
 886           consistent memory pool.  This pool of virtual memory
 887           is used to make consistent memory allocations.
 888
 889 config CONSISTENT_SIZE
 890         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 891         default "0x00200000" if NOT_COHERENT_CACHE
 892
 893 config PIN_TLB
 894         bool "Pinned Kernel TLBs (860 ONLY)"
 895         depends on ADVANCED_OPTIONS && 8xx
 896 endmenu
 897
 898 if PPC64
 899 config RELOCATABLE
 900         bool "Build a relocatable kernel"
 901         help
 902           This builds a kernel image that is capable of running anywhere
 903           in the RMA (real memory area) at any 16k-aligned base address.
 904           The kernel is linked as a position-independent executable (PIE)
 905           and contains dynamic relocations which are processed early
 906           in the bootup process.
 907
 908           One use is for the kexec on panic case where the recovery kernel
 909           must live at a different physical address than the primary
 910           kernel.
 911
 912 config PAGE_OFFSET
 913         hex
 914         default "0xc000000000000000"
 915 config KERNEL_START
 916         hex
 917         default "0xc000000000000000"
 918 config PHYSICAL_START
 919         hex
 920         default "0x00000000"
 921 endif
 922
 923 source "net/Kconfig"
 924
 925 source "drivers/Kconfig"
 926
 927 source "fs/Kconfig"
 928
 929 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 930
 931 source "lib/Kconfig"
 932
 933 source "arch/powerpc/Kconfig.debug"
 934
 935 source "security/Kconfig"
 936
 937 config KEYS_COMPAT
 938         bool
 939         depends on COMPAT && KEYS
 940         default y
 941
 942 source "crypto/Kconfig"
 943
 944 config PPC_CLOCK
 945         bool
 946         default n
 947         select HAVE_CLK
 948
 949 config PPC_LIB_RHEAP
 950         bool
 951
 952 source "arch/powerpc/kvm/Kconfig"