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 HAVE_SETUP_PER_CPU_AREA
  46         def_bool PPC64
  47
  48 config IRQ_PER_CPU
  49         bool
  50         default y
  51
  52 config STACKTRACE_SUPPORT
  53         bool
  54         default y
  55
  56 config HAVE_LATENCYTOP_SUPPORT
  57         def_bool y
  58
  59 config TRACE_IRQFLAGS_SUPPORT
  60         bool
  61         depends on PPC64
  62         default y
  63
  64 config LOCKDEP_SUPPORT
  65         bool
  66         default y
  67
  68 config RWSEM_GENERIC_SPINLOCK
  69         bool
  70
  71 config RWSEM_XCHGADD_ALGORITHM
  72         bool
  73         default y
  74
  75 config GENERIC_LOCKBREAK
  76         bool
  77         default y
  78         depends on SMP && PREEMPT
  79
  80 config ARCH_HAS_ILOG2_U32
  81         bool
  82         default y
  83
  84 config ARCH_HAS_ILOG2_U64
  85         bool
  86         default y if 64BIT
  87
  88 config GENERIC_HWEIGHT
  89         bool
  90         default y
  91
  92 config GENERIC_CALIBRATE_DELAY
  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 DEFAULT_UIMAGE
 185         bool
 186         help
 187           Used to allow a board to specify it wants a uImage built by default
 188         default n
 189
 190 config REDBOOT
 191         bool
 192
 193 config HIBERNATE_32
 194         bool
 195         depends on (PPC_PMAC && !SMP) || BROKEN
 196         default y
 197
 198 config HIBERNATE_64
 199         bool
 200         depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
 201         default y
 202
 203 config ARCH_HIBERNATION_POSSIBLE
 204         bool
 205         depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
 206         default y
 207
 208 config ARCH_SUSPEND_POSSIBLE
 209         def_bool y
 210         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
 211
 212 config PPC_DCR_NATIVE
 213         bool
 214         default n
 215
 216 config PPC_DCR_MMIO
 217         bool
 218         default n
 219
 220 config PPC_DCR
 221         bool
 222         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 223         default y
 224
 225 config PPC_OF_PLATFORM_PCI
 226         bool
 227         depends on PCI
 228         depends on PPC64 # not supported on 32 bits yet
 229         default n
 230
 231 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 232         def_bool y
 233
 234 source "init/Kconfig"
 235
 236 source "kernel/Kconfig.freezer"
 237
 238 source "arch/powerpc/sysdev/Kconfig"
 239 source "arch/powerpc/platforms/Kconfig"
 240
 241 menu "Kernel options"
 242
 243 config HIGHMEM
 244         bool "High memory support"
 245         depends on PPC32
 246
 247 source kernel/time/Kconfig
 248 source kernel/Kconfig.hz
 249 source kernel/Kconfig.preempt
 250 source "fs/Kconfig.binfmt"
 251
 252 config HUGETLB_PAGE_SIZE_VARIABLE
 253         bool
 254         depends on HUGETLB_PAGE
 255         default y
 256
 257 config MATH_EMULATION
 258         bool "Math emulation"
 259         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 260         ---help---
 261           Some PowerPC chips designed for embedded applications do not have
 262           a floating-point unit and therefore do not implement the
 263           floating-point instructions in the PowerPC instruction set.  If you
 264           say Y here, the kernel will include code to emulate a floating-point
 265           unit, which will allow programs that use floating-point
 266           instructions to run.
 267
 268 config 8XX_MINIMAL_FPEMU
 269         bool "Minimal math emulation for 8xx"
 270         depends on 8xx && !MATH_EMULATION
 271         help
 272           Older arch/ppc kernels still emulated a few floating point
 273           instructions such as load and store, even when full math
 274           emulation is disabled.  Say "Y" here if you want to preserve
 275           this behavior.
 276
 277           It is recommended that you build a soft-float userspace instead.
 278
 279 config IOMMU_VMERGE
 280         bool "Enable IOMMU virtual merging"
 281         depends on PPC64
 282         default y
 283         help
 284           Cause IO segments sent to a device for DMA to be merged virtually
 285           by the IOMMU when they happen to have been allocated contiguously.
 286           This doesn't add pressure to the IOMMU allocator. However, some
 287           drivers don't support getting large merged segments coming back
 288           from *_map_sg().
 289
 290           Most drivers don't have this problem; it is safe to say Y here.
 291
 292 config IOMMU_HELPER
 293         def_bool PPC64
 294
 295 config PPC_NEED_DMA_SYNC_OPS
 296         def_bool y
 297         depends on NOT_COHERENT_CACHE
 298
 299 config HOTPLUG_CPU
 300         bool "Support for enabling/disabling CPUs"
 301         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 302         ---help---
 303           Say Y here to be able to disable and re-enable individual
 304           CPUs at runtime on SMP machines.
 305
 306           Say N if you are unsure.
 307
 308 config ARCH_ENABLE_MEMORY_HOTPLUG
 309         def_bool y
 310
 311 config ARCH_HAS_WALK_MEMORY
 312         def_bool y
 313
 314 config ARCH_ENABLE_MEMORY_HOTREMOVE
 315         def_bool y
 316
 317 config KEXEC
 318         bool "kexec system call (EXPERIMENTAL)"
 319         depends on PPC_BOOK3S && EXPERIMENTAL
 320         help
 321           kexec is a system call that implements the ability to shutdown your
 322           current kernel, and to start another kernel.  It is like a reboot
 323           but it is independent of the system firmware.   And like a reboot
 324           you can start any kernel with it, not just Linux.
 325
 326           The name comes from the similarity to the exec system call.
 327
 328           It is an ongoing process to be certain the hardware in a machine
 329           is properly shutdown, so do not be surprised if this code does not
 330           initially work for you.  It may help to enable device hotplugging
 331           support.  As of this writing the exact hardware interface is
 332           strongly in flux, so no good recommendation can be made.
 333
 334 config CRASH_DUMP
 335         bool "Build a kdump crash kernel"
 336         depends on PPC64 || 6xx
 337         select RELOCATABLE if PPC64
 338         help
 339           Build a kernel suitable for use as a kdump capture kernel.
 340           The same kernel binary can be used as production kernel and dump
 341           capture kernel.
 342
 343 config PHYP_DUMP
 344         bool "Hypervisor-assisted dump (EXPERIMENTAL)"
 345         depends on PPC_PSERIES && EXPERIMENTAL
 346         help
 347           Hypervisor-assisted dump is meant to be a kdump replacement
 348           offering robustness and speed not possible without system
 349           hypervisor assistance.
 350
 351           If unsure, say "N"
 352
 353 config PPCBUG_NVRAM
 354         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 355         default y if PPC_PREP
 356
 357 config IRQ_ALL_CPUS
 358         bool "Distribute interrupts on all CPUs by default"
 359         depends on SMP && !MV64360
 360         help
 361           This option gives the kernel permission to distribute IRQs across
 362           multiple CPUs.  Saying N here will route all IRQs to the first
 363           CPU.  Generally saying Y is safe, although some problems have been
 364           reported with SMP Power Macintoshes with this option enabled.
 365
 366 config NUMA
 367         bool "NUMA support"
 368         depends on PPC64
 369         default y if SMP && PPC_PSERIES
 370
 371 config NODES_SHIFT
 372         int
 373         default "4"
 374         depends on NEED_MULTIPLE_NODES
 375
 376 config ARCH_SELECT_MEMORY_MODEL
 377         def_bool y
 378         depends on PPC64
 379
 380 config ARCH_FLATMEM_ENABLE
 381         def_bool y
 382         depends on (PPC64 && !NUMA) || PPC32
 383
 384 config ARCH_SPARSEMEM_ENABLE
 385         def_bool y
 386         depends on PPC64
 387         select SPARSEMEM_VMEMMAP_ENABLE
 388
 389 config ARCH_SPARSEMEM_DEFAULT
 390         def_bool y
 391         depends on (SMP && PPC_PSERIES) || PPC_PS3
 392
 393 config ARCH_POPULATES_NODE_MAP
 394         def_bool y
 395
 396 source "mm/Kconfig"
 397
 398 config ARCH_MEMORY_PROBE
 399         def_bool y
 400         depends on MEMORY_HOTPLUG
 401
 402 # Some NUMA nodes have memory ranges that span
 403 # other nodes.  Even though a pfn is valid and
 404 # between a node's start and end pfns, it may not
 405 # reside on that node.  See memmap_init_zone()
 406 # for details.
 407 config NODES_SPAN_OTHER_NODES
 408         def_bool y
 409         depends on NEED_MULTIPLE_NODES
 410
 411 config PPC_HAS_HASH_64K
 412         bool
 413         depends on PPC64
 414         default n
 415
 416 config STDBINUTILS
 417         bool "Using standard binutils settings"
 418         depends on 44x
 419         default y
 420         help
 421           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 422           Note, that kernel will be able to run only those applications,
 423           which had been compiled using binutils later than 2.17.50.0.3 with
 424           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 425           the older binutils, you can patch them with a trivial patch, which
 426           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 427
 428 choice
 429         prompt "Page size"
 430         default PPC_4K_PAGES
 431         help
 432           Select the kernel logical page size. Increasing the page size
 433           will reduce software overhead at each page boundary, allow
 434           hardware prefetch mechanisms to be more effective, and allow
 435           larger dma transfers increasing IO efficiency and reducing
 436           overhead. However the utilization of memory will increase.
 437           For example, each cached file will using a multiple of the
 438           page size to hold its contents and the difference between the
 439           end of file and the end of page is wasted.
 440
 441           Some dedicated systems, such as software raid serving with
 442           accelerated calculations, have shown significant increases.
 443
 444           If you configure a 64 bit kernel for 64k pages but the
 445           processor does not support them, then the kernel will simulate
 446           them with 4k pages, loading them on demand, but with the
 447           reduced software overhead and larger internal fragmentation.
 448           For the 32 bit kernel, a large page option will not be offered
 449           unless it is supported by the configured processor.
 450
 451           If unsure, choose 4K_PAGES.
 452
 453 config PPC_4K_PAGES
 454         bool "4k page size"
 455
 456 config PPC_16K_PAGES
 457         bool "16k page size" if 44x
 458
 459 config PPC_64K_PAGES
 460         bool "64k page size" if 44x || PPC_STD_MMU_64
 461         select PPC_HAS_HASH_64K if PPC_STD_MMU_64
 462
 463 config PPC_256K_PAGES
 464         bool "256k page size" if 44x
 465         depends on !STDBINUTILS && (!SHMEM || BROKEN)
 466         help
 467           Make the page size 256k.
 468
 469           As the ELF standard only requires alignment to support page
 470           sizes up to 64k, you will need to compile all of your user
 471           space applications with a non-standard binutils settings
 472           (see the STDBINUTILS description for details).
 473
 474           Say N unless you know what you are doing.
 475
 476 endchoice
 477
 478 config FORCE_MAX_ZONEORDER
 479         int "Maximum zone order"
 480         range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
 481         default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
 482         range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
 483         default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
 484         range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
 485         default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
 486         range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
 487         default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
 488         range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
 489         default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
 490         range 11 64
 491         default "11"
 492         help
 493           The kernel memory allocator divides physically contiguous memory
 494           blocks into "zones", where each zone is a power of two number of
 495           pages.  This option selects the largest power of two that the kernel
 496           keeps in the memory allocator.  If you need to allocate very large
 497           blocks of physically contiguous memory, then you may need to
 498           increase this value.
 499
 500           This config option is actually maximum order plus one. For example,
 501           a value of 11 means that the largest free memory block is 2^10 pages.
 502
 503           The page size is not necessarily 4KB.  For example, on 64-bit
 504           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 505           this in mind when choosing a value for this option.
 506
 507 config PPC_SUBPAGE_PROT
 508         bool "Support setting protections for 4k subpages"
 509         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 510         help
 511           This option adds support for a system call to allow user programs
 512           to set access permissions (read/write, readonly, or no access)
 513           on the 4k subpages of each 64k page.
 514
 515 config SCHED_SMT
 516         bool "SMT (Hyperthreading) scheduler support"
 517         depends on PPC64 && SMP
 518         help
 519           SMT scheduler support improves the CPU scheduler's decision making
 520           when dealing with POWER5 cpus at a cost of slightly increased
 521           overhead in some places. If unsure say N here.
 522
 523 config PROC_DEVICETREE
 524         bool "Support for device tree in /proc"
 525         depends on PROC_FS
 526         help
 527           This option adds a device-tree directory under /proc which contains
 528           an image of the device tree that the kernel copies from Open
 529           Firmware or other boot firmware. If unsure, say Y here.
 530
 531 config CMDLINE_BOOL
 532         bool "Default bootloader kernel arguments"
 533
 534 config CMDLINE
 535         string "Initial kernel command string"
 536         depends on CMDLINE_BOOL
 537         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 538         help
 539           On some platforms, there is currently no way for the boot loader to
 540           pass arguments to the kernel. For these platforms, you can supply
 541           some command-line options at build time by entering them here.  In
 542           most cases you will need to specify the root device here.
 543
 544 config EXTRA_TARGETS
 545         string "Additional default image types"
 546         help
 547           List additional targets to be built by the bootwrapper here (separated
 548           by spaces).  This is useful for targets that depend of device tree
 549           files in the .dts directory.
 550
 551           Targets in this list will be build as part of the default build
 552           target, or when the user does a 'make zImage' or a
 553           'make zImage.initrd'.
 554
 555           If unsure, leave blank
 556
 557 if !44x || BROKEN
 558 config ARCH_WANTS_FREEZER_CONTROL
 559         def_bool y
 560         depends on ADB_PMU
 561
 562 source kernel/power/Kconfig
 563 endif
 564
 565 config SECCOMP
 566         bool "Enable seccomp to safely compute untrusted bytecode"
 567         depends on PROC_FS
 568         default y
 569         help
 570           This kernel feature is useful for number crunching applications
 571           that may need to compute untrusted bytecode during their
 572           execution. By using pipes or other transports made available to
 573           the process as file descriptors supporting the read/write
 574           syscalls, it's possible to isolate those applications in
 575           their own address space using seccomp. Once seccomp is
 576           enabled via /proc/<pid>/seccomp, it cannot be disabled
 577           and the task is only allowed to execute a few safe syscalls
 578           defined by each seccomp mode.
 579
 580           If unsure, say Y. Only embedded should say N here.
 581
 582 endmenu
 583
 584 config ISA_DMA_API
 585         bool
 586         default !PPC_ISERIES || PCI
 587
 588 menu "Bus options"
 589
 590 config ISA
 591         bool "Support for ISA-bus hardware"
 592         depends on PPC_PREP || PPC_CHRP
 593         select PPC_I8259
 594         help
 595           Find out whether you have ISA slots on your motherboard.  ISA is the
 596           name of a bus system, i.e. the way the CPU talks to the other stuff
 597           inside your box.  If you have an Apple machine, say N here; if you
 598           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 599           you have an embedded board, consult your board documentation.
 600
 601 config ZONE_DMA
 602         bool
 603         default y
 604
 605 config GENERIC_ISA_DMA
 606         bool
 607         depends on PPC64 || POWER4 || 6xx && !CPM2
 608         default y
 609
 610 config PPC_INDIRECT_PCI
 611         bool
 612         depends on PCI
 613         default y if 40x || 44x
 614         default n
 615
 616 config EISA
 617         bool
 618
 619 config SBUS
 620         bool
 621
 622 config FSL_SOC
 623         bool
 624
 625 config FSL_PCI
 626         bool
 627         select PPC_INDIRECT_PCI
 628         select PCI_QUIRKS
 629
 630 config 4xx_SOC
 631         bool
 632
 633 config FSL_LBC
 634         bool
 635         help
 636           Freescale Localbus support
 637
 638 config FSL_GTM
 639         bool
 640         depends on PPC_83xx || QUICC_ENGINE || CPM2
 641         help
 642           Freescale General-purpose Timers support
 643
 644 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 645 config MCA
 646         bool
 647
 648 # Platforms that what PCI turned unconditionally just do select PCI
 649 # in their config node.  Platforms that want to choose at config
 650 # time should select PPC_PCI_CHOICE
 651 config PPC_PCI_CHOICE
 652         bool
 653
 654 config PCI
 655         bool "PCI support" if PPC_PCI_CHOICE
 656         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 657                 && !PPC_85xx && !PPC_86xx
 658         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 659         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 660         select ARCH_SUPPORTS_MSI
 661         help
 662           Find out whether your system includes a PCI bus. PCI is the name of
 663           a bus system, i.e. the way the CPU talks to the other stuff inside
 664           your box.  If you say Y here, the kernel will include drivers and
 665           infrastructure code to support PCI bus devices.
 666
 667 config PCI_DOMAINS
 668         def_bool PCI
 669
 670 config PCI_SYSCALL
 671         def_bool PCI
 672
 673 config PCI_QSPAN
 674         bool "QSpan PCI"
 675         depends on !4xx && !CPM2 && 8xx
 676         select PPC_I8259
 677         help
 678           Say Y here if you have a system based on a Motorola 8xx-series
 679           embedded processor with a QSPAN PCI interface, otherwise say N.
 680
 681 config PCI_8260
 682         bool
 683         depends on PCI && 8260
 684         select PPC_INDIRECT_PCI
 685         default y
 686
 687 config 8260_PCI9
 688         bool "Enable workaround for MPC826x erratum PCI 9"
 689         depends on PCI_8260 && !8272
 690         default y
 691
 692 choice
 693         prompt "IDMA channel for PCI 9 workaround"
 694         depends on 8260_PCI9
 695
 696 config 8260_PCI9_IDMA1
 697         bool "IDMA1"
 698
 699 config 8260_PCI9_IDMA2
 700         bool "IDMA2"
 701
 702 config 8260_PCI9_IDMA3
 703         bool "IDMA3"
 704
 705 config 8260_PCI9_IDMA4
 706         bool "IDMA4"
 707
 708 endchoice
 709
 710 source "drivers/pci/pcie/Kconfig"
 711
 712 source "drivers/pci/Kconfig"
 713
 714 source "drivers/pcmcia/Kconfig"
 715
 716 source "drivers/pci/hotplug/Kconfig"
 717
 718 config HAS_RAPIDIO
 719         bool
 720         default n
 721
 722 config RAPIDIO
 723         bool "RapidIO support"
 724         depends on HAS_RAPIDIO
 725         help
 726           If you say Y here, the kernel will include drivers and
 727           infrastructure code to support RapidIO interconnect devices.
 728
 729 source "drivers/rapidio/Kconfig"
 730
 731 endmenu
 732
 733 menu "Advanced setup"
 734         depends on PPC32
 735
 736 config ADVANCED_OPTIONS
 737         bool "Prompt for advanced kernel configuration options"
 738         help
 739           This option will enable prompting for a variety of advanced kernel
 740           configuration options.  These options can cause the kernel to not
 741           work if they are set incorrectly, but can be used to optimize certain
 742           aspects of kernel memory management.
 743
 744           Unless you know what you are doing, say N here.
 745
 746 comment "Default settings for advanced configuration options are used"
 747         depends on !ADVANCED_OPTIONS
 748
 749 config LOWMEM_SIZE_BOOL
 750         bool "Set maximum low memory"
 751         depends on ADVANCED_OPTIONS
 752         help
 753           This option allows you to set the maximum amount of memory which
 754           will be used as "low memory", that is, memory which the kernel can
 755           access directly, without having to set up a kernel virtual mapping.
 756           This can be useful in optimizing the layout of kernel virtual
 757           memory.
 758
 759           Say N here unless you know what you are doing.
 760
 761 config LOWMEM_SIZE
 762         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 763         default "0x30000000"
 764
 765 config LOWMEM_CAM_NUM_BOOL
 766         bool "Set number of CAMs to use to map low memory"
 767         depends on ADVANCED_OPTIONS && FSL_BOOKE
 768         help
 769           This option allows you to set the maximum number of CAM slots that
 770           will be used to map low memory.  There are a limited number of slots
 771           available and even more limited number that will fit in the L1 MMU.
 772           However, using more entries will allow mapping more low memory.  This
 773           can be useful in optimizing the layout of kernel virtual memory.
 774
 775           Say N here unless you know what you are doing.
 776
 777 config LOWMEM_CAM_NUM
 778         depends on FSL_BOOKE
 779         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 780         default 3
 781
 782 config RELOCATABLE
 783         bool "Build a relocatable kernel (EXPERIMENTAL)"
 784         depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 785         help
 786           This builds a kernel image that is capable of running at the
 787           location the kernel is loaded at (some alignment restrictions may
 788           exist).
 789
 790           One use is for the kexec on panic case where the recovery kernel
 791           must live at a different physical address than the primary
 792           kernel.
 793
 794           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 795           it has been loaded at and the compile time physical addresses
 796           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 797           setting can still be useful to bootwrappers that need to know the
 798           load location of the kernel (eg. u-boot/mkimage).
 799
 800 config PAGE_OFFSET_BOOL
 801         bool "Set custom page offset address"
 802         depends on ADVANCED_OPTIONS
 803         help
 804           This option allows you to set the kernel virtual address at which
 805           the kernel will map low memory.  This can be useful in optimizing
 806           the virtual memory layout of the system.
 807
 808           Say N here unless you know what you are doing.
 809
 810 config PAGE_OFFSET
 811         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 812         default "0xc0000000"
 813
 814 config KERNEL_START_BOOL
 815         bool "Set custom kernel base 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 be loaded.  Normally this should match PAGE_OFFSET
 820           however there are times (like kdump) that one might not want them
 821           to be the same.
 822
 823           Say N here unless you know what you are doing.
 824
 825 config KERNEL_START
 826         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 827         default PAGE_OFFSET if PAGE_OFFSET_BOOL
 828         default "0xc2000000" if CRASH_DUMP
 829         default "0xc0000000"
 830
 831 config PHYSICAL_START_BOOL
 832         bool "Set physical address where the kernel is loaded"
 833         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 834         help
 835           This gives the physical address where the kernel is loaded.
 836
 837           Say N here unless you know what you are doing.
 838
 839 config PHYSICAL_START
 840         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
 841         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
 842         default "0x00000000"
 843
 844 config PHYSICAL_ALIGN
 845         hex
 846         default "0x04000000" if FSL_BOOKE
 847         help
 848           This value puts the alignment restrictions on physical address
 849           where kernel is loaded and run from. Kernel is compiled for an
 850           address which meets above alignment restriction.
 851
 852 config TASK_SIZE_BOOL
 853         bool "Set custom user task size"
 854         depends on ADVANCED_OPTIONS
 855         help
 856           This option allows you to set the amount of virtual address space
 857           allocated to user tasks.  This can be useful in optimizing the
 858           virtual memory layout of the system.
 859
 860           Say N here unless you know what you are doing.
 861
 862 config TASK_SIZE
 863         hex "Size of user task space" if TASK_SIZE_BOOL
 864         default "0x80000000" if PPC_PREP || PPC_8xx
 865         default "0xc0000000"
 866
 867 config PIN_TLB
 868         bool "Pinned Kernel TLBs (860 ONLY)"
 869         depends on ADVANCED_OPTIONS && 8xx
 870 endmenu
 871
 872 if PPC64
 873 config RELOCATABLE
 874         bool "Build a relocatable kernel"
 875         help
 876           This builds a kernel image that is capable of running anywhere
 877           in the RMA (real memory area) at any 16k-aligned base address.
 878           The kernel is linked as a position-independent executable (PIE)
 879           and contains dynamic relocations which are processed early
 880           in the bootup process.
 881
 882           One use is for the kexec on panic case where the recovery kernel
 883           must live at a different physical address than the primary
 884           kernel.
 885
 886 config PAGE_OFFSET
 887         hex
 888         default "0xc000000000000000"
 889 config KERNEL_START
 890         hex
 891         default "0xc000000000000000"
 892 config PHYSICAL_START
 893         hex
 894         default "0x00000000"
 895 endif
 896
 897 source "net/Kconfig"
 898
 899 source "drivers/Kconfig"
 900
 901 source "fs/Kconfig"
 902
 903 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 904
 905 source "lib/Kconfig"
 906
 907 source "arch/powerpc/Kconfig.debug"
 908
 909 source "security/Kconfig"
 910
 911 config KEYS_COMPAT
 912         bool
 913         depends on COMPAT && KEYS
 914         default y
 915
 916 source "crypto/Kconfig"
 917
 918 config PPC_CLOCK
 919         bool
 920         default n
 921         select HAVE_CLK
 922
 923 config PPC_LIB_RHEAP
 924         bool
 925
 926 source "arch/powerpc/kvm/Kconfig"