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         select GENERIC_ATOMIC64 if PPC32
 129
 130 config EARLY_PRINTK
 131         bool
 132         default y
 133
 134 config COMPAT
 135         bool
 136         default y if PPC64
 137         select COMPAT_BINFMT_ELF
 138
 139 config SYSVIPC_COMPAT
 140         bool
 141         depends on COMPAT && SYSVIPC
 142         default y
 143
 144 # All PPC32s use generic nvram driver through ppc_md
 145 config GENERIC_NVRAM
 146         bool
 147         default y if PPC32
 148
 149 config SCHED_OMIT_FRAME_POINTER
 150         bool
 151         default y
 152
 153 config ARCH_MAY_HAVE_PC_FDC
 154         bool
 155         default !PPC_PSERIES || PCI
 156
 157 config PPC_OF
 158         def_bool y
 159
 160 config OF
 161         def_bool y
 162
 163 config PPC_UDBG_16550
 164         bool
 165         default n
 166
 167 config GENERIC_TBSYNC
 168         bool
 169         default y if PPC32 && SMP
 170         default n
 171
 172 config AUDIT_ARCH
 173         bool
 174         default y
 175
 176 config GENERIC_BUG
 177         bool
 178         default y
 179         depends on BUG
 180
 181 config SYS_SUPPORTS_APM_EMULATION
 182         default y if PMAC_APM_EMU
 183         bool
 184
 185 config DTC
 186        bool
 187        default y
 188
 189 config DEFAULT_UIMAGE
 190         bool
 191         help
 192           Used to allow a board to specify it wants a uImage built by default
 193         default n
 194
 195 config REDBOOT
 196         bool
 197
 198 config HIBERNATE_32
 199         bool
 200         depends on (PPC_PMAC && !SMP) || BROKEN
 201         default y
 202
 203 config HIBERNATE_64
 204         bool
 205         depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
 206         default y
 207
 208 config ARCH_HIBERNATION_POSSIBLE
 209         bool
 210         depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
 211         default y
 212
 213 config ARCH_SUSPEND_POSSIBLE
 214         def_bool y
 215         depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
 216
 217 config PPC_DCR_NATIVE
 218         bool
 219         default n
 220
 221 config PPC_DCR_MMIO
 222         bool
 223         default n
 224
 225 config PPC_DCR
 226         bool
 227         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
 228         default y
 229
 230 config PPC_OF_PLATFORM_PCI
 231         bool
 232         depends on PCI
 233         depends on PPC64 # not supported on 32 bits yet
 234         default n
 235
 236 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 237         def_bool y
 238
 239 source "init/Kconfig"
 240
 241 source "kernel/Kconfig.freezer"
 242
 243 source "arch/powerpc/sysdev/Kconfig"
 244 source "arch/powerpc/platforms/Kconfig"
 245
 246 menu "Kernel options"
 247
 248 config HIGHMEM
 249         bool "High memory support"
 250         depends on PPC32
 251
 252 source kernel/time/Kconfig
 253 source kernel/Kconfig.hz
 254 source kernel/Kconfig.preempt
 255 source "fs/Kconfig.binfmt"
 256
 257 config HUGETLB_PAGE_SIZE_VARIABLE
 258         bool
 259         depends on HUGETLB_PAGE
 260         default y
 261
 262 config MATH_EMULATION
 263         bool "Math emulation"
 264         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 265         ---help---
 266           Some PowerPC chips designed for embedded applications do not have
 267           a floating-point unit and therefore do not implement the
 268           floating-point instructions in the PowerPC instruction set.  If you
 269           say Y here, the kernel will include code to emulate a floating-point
 270           unit, which will allow programs that use floating-point
 271           instructions to run.
 272
 273 config 8XX_MINIMAL_FPEMU
 274         bool "Minimal math emulation for 8xx"
 275         depends on 8xx && !MATH_EMULATION
 276         help
 277           Older arch/ppc kernels still emulated a few floating point
 278           instructions such as load and store, even when full math
 279           emulation is disabled.  Say "Y" here if you want to preserve
 280           this behavior.
 281
 282           It is recommended that you build a soft-float userspace instead.
 283
 284 config IOMMU_VMERGE
 285         bool "Enable IOMMU virtual merging"
 286         depends on PPC64
 287         default y
 288         help
 289           Cause IO segments sent to a device for DMA to be merged virtually
 290           by the IOMMU when they happen to have been allocated contiguously.
 291           This doesn't add pressure to the IOMMU allocator. However, some
 292           drivers don't support getting large merged segments coming back
 293           from *_map_sg().
 294
 295           Most drivers don't have this problem; it is safe to say Y here.
 296
 297 config IOMMU_HELPER
 298         def_bool PPC64
 299
 300 config SWIOTLB
 301         bool "SWIOTLB support"
 302         default n
 303         select IOMMU_HELPER
 304         ---help---
 305           Support for IO bounce buffering for systems without an IOMMU.
 306           This allows us to DMA to the full physical address space on
 307           platforms where the size of a physical address is larger
 308           than the bus address.  Not all platforms support this.
 309
 310 config PPC_NEED_DMA_SYNC_OPS
 311         def_bool y
 312         depends on (NOT_COHERENT_CACHE || SWIOTLB)
 313
 314 config HOTPLUG_CPU
 315         bool "Support for enabling/disabling CPUs"
 316         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 317         ---help---
 318           Say Y here to be able to disable and re-enable individual
 319           CPUs at runtime on SMP machines.
 320
 321           Say N if you are unsure.
 322
 323 config ARCH_ENABLE_MEMORY_HOTPLUG
 324         def_bool y
 325
 326 config ARCH_HAS_WALK_MEMORY
 327         def_bool y
 328
 329 config ARCH_ENABLE_MEMORY_HOTREMOVE
 330         def_bool y
 331
 332 config KEXEC
 333         bool "kexec system call (EXPERIMENTAL)"
 334         depends on PPC_BOOK3S && EXPERIMENTAL
 335         help
 336           kexec is a system call that implements the ability to shutdown your
 337           current kernel, and to start another kernel.  It is like a reboot
 338           but it is independent of the system firmware.   And like a reboot
 339           you can start any kernel with it, not just Linux.
 340
 341           The name comes from the similarity to the exec system call.
 342
 343           It is an ongoing process to be certain the hardware in a machine
 344           is properly shutdown, so do not be surprised if this code does not
 345           initially work for you.  It may help to enable device hotplugging
 346           support.  As of this writing the exact hardware interface is
 347           strongly in flux, so no good recommendation can be made.
 348
 349 config CRASH_DUMP
 350         bool "Build a kdump crash kernel"
 351         depends on PPC64 || 6xx
 352         select RELOCATABLE if PPC64
 353         help
 354           Build a kernel suitable for use as a kdump capture kernel.
 355           The same kernel binary can be used as production kernel and dump
 356           capture kernel.
 357
 358 config PHYP_DUMP
 359         bool "Hypervisor-assisted dump (EXPERIMENTAL)"
 360         depends on PPC_PSERIES && EXPERIMENTAL
 361         help
 362           Hypervisor-assisted dump is meant to be a kdump replacement
 363           offering robustness and speed not possible without system
 364           hypervisor assistance.
 365
 366           If unsure, say "N"
 367
 368 config PPCBUG_NVRAM
 369         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 370         default y if PPC_PREP
 371
 372 config IRQ_ALL_CPUS
 373         bool "Distribute interrupts on all CPUs by default"
 374         depends on SMP && !MV64360
 375         help
 376           This option gives the kernel permission to distribute IRQs across
 377           multiple CPUs.  Saying N here will route all IRQs to the first
 378           CPU.  Generally saying Y is safe, although some problems have been
 379           reported with SMP Power Macintoshes with this option enabled.
 380
 381 config NUMA
 382         bool "NUMA support"
 383         depends on PPC64
 384         default y if SMP && PPC_PSERIES
 385
 386 config NODES_SHIFT
 387         int
 388         default "4"
 389         depends on NEED_MULTIPLE_NODES
 390
 391 config ARCH_SELECT_MEMORY_MODEL
 392         def_bool y
 393         depends on PPC64
 394
 395 config ARCH_FLATMEM_ENABLE
 396         def_bool y
 397         depends on (PPC64 && !NUMA) || PPC32
 398
 399 config ARCH_SPARSEMEM_ENABLE
 400         def_bool y
 401         depends on PPC64
 402         select SPARSEMEM_VMEMMAP_ENABLE
 403
 404 config ARCH_SPARSEMEM_DEFAULT
 405         def_bool y
 406         depends on (SMP && PPC_PSERIES) || PPC_PS3
 407
 408 config ARCH_POPULATES_NODE_MAP
 409         def_bool y
 410
 411 source "mm/Kconfig"
 412
 413 config ARCH_MEMORY_PROBE
 414         def_bool y
 415         depends on MEMORY_HOTPLUG
 416
 417 # Some NUMA nodes have memory ranges that span
 418 # other nodes.  Even though a pfn is valid and
 419 # between a node's start and end pfns, it may not
 420 # reside on that node.  See memmap_init_zone()
 421 # for details.
 422 config NODES_SPAN_OTHER_NODES
 423         def_bool y
 424         depends on NEED_MULTIPLE_NODES
 425
 426 config PPC_HAS_HASH_64K
 427         bool
 428         depends on PPC64
 429         default n
 430
 431 config STDBINUTILS
 432         bool "Using standard binutils settings"
 433         depends on 44x
 434         default y
 435         help
 436           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 437           Note, that kernel will be able to run only those applications,
 438           which had been compiled using binutils later than 2.17.50.0.3 with
 439           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 440           the older binutils, you can patch them with a trivial patch, which
 441           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 442
 443 choice
 444         prompt "Page size"
 445         default PPC_4K_PAGES
 446         help
 447           Select the kernel logical page size. Increasing the page size
 448           will reduce software overhead at each page boundary, allow
 449           hardware prefetch mechanisms to be more effective, and allow
 450           larger dma transfers increasing IO efficiency and reducing
 451           overhead. However the utilization of memory will increase.
 452           For example, each cached file will using a multiple of the
 453           page size to hold its contents and the difference between the
 454           end of file and the end of page is wasted.
 455
 456           Some dedicated systems, such as software raid serving with
 457           accelerated calculations, have shown significant increases.
 458
 459           If you configure a 64 bit kernel for 64k pages but the
 460           processor does not support them, then the kernel will simulate
 461           them with 4k pages, loading them on demand, but with the
 462           reduced software overhead and larger internal fragmentation.
 463           For the 32 bit kernel, a large page option will not be offered
 464           unless it is supported by the configured processor.
 465
 466           If unsure, choose 4K_PAGES.
 467
 468 config PPC_4K_PAGES
 469         bool "4k page size"
 470
 471 config PPC_16K_PAGES
 472         bool "16k page size" if 44x
 473
 474 config PPC_64K_PAGES
 475         bool "64k page size" if 44x || PPC_STD_MMU_64
 476         select PPC_HAS_HASH_64K if PPC_STD_MMU_64
 477
 478 config PPC_256K_PAGES
 479         bool "256k page size" if 44x
 480         depends on !STDBINUTILS
 481         help
 482           Make the page size 256k.
 483
 484           As the ELF standard only requires alignment to support page
 485           sizes up to 64k, you will need to compile all of your user
 486           space applications with a non-standard binutils settings
 487           (see the STDBINUTILS description for details).
 488
 489           Say N unless you know what you are doing.
 490
 491 endchoice
 492
 493 config FORCE_MAX_ZONEORDER
 494         int "Maximum zone order"
 495         range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
 496         default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
 497         range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
 498         default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
 499         range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
 500         default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
 501         range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
 502         default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
 503         range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
 504         default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
 505         range 11 64
 506         default "11"
 507         help
 508           The kernel memory allocator divides physically contiguous memory
 509           blocks into "zones", where each zone is a power of two number of
 510           pages.  This option selects the largest power of two that the kernel
 511           keeps in the memory allocator.  If you need to allocate very large
 512           blocks of physically contiguous memory, then you may need to
 513           increase this value.
 514
 515           This config option is actually maximum order plus one. For example,
 516           a value of 11 means that the largest free memory block is 2^10 pages.
 517
 518           The page size is not necessarily 4KB.  For example, on 64-bit
 519           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 520           this in mind when choosing a value for this option.
 521
 522 config PPC_SUBPAGE_PROT
 523         bool "Support setting protections for 4k subpages"
 524         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 525         help
 526           This option adds support for a system call to allow user programs
 527           to set access permissions (read/write, readonly, or no access)
 528           on the 4k subpages of each 64k page.
 529
 530 config SCHED_SMT
 531         bool "SMT (Hyperthreading) scheduler support"
 532         depends on PPC64 && SMP
 533         help
 534           SMT scheduler support improves the CPU scheduler's decision making
 535           when dealing with POWER5 cpus at a cost of slightly increased
 536           overhead in some places. If unsure say N here.
 537
 538 config PROC_DEVICETREE
 539         bool "Support for device tree in /proc"
 540         depends on PROC_FS
 541         help
 542           This option adds a device-tree directory under /proc which contains
 543           an image of the device tree that the kernel copies from Open
 544           Firmware or other boot firmware. If unsure, say Y here.
 545
 546 config CMDLINE_BOOL
 547         bool "Default bootloader kernel arguments"
 548
 549 config CMDLINE
 550         string "Initial kernel command string"
 551         depends on CMDLINE_BOOL
 552         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 553         help
 554           On some platforms, there is currently no way for the boot loader to
 555           pass arguments to the kernel. For these platforms, you can supply
 556           some command-line options at build time by entering them here.  In
 557           most cases you will need to specify the root device here.
 558
 559 config EXTRA_TARGETS
 560         string "Additional default image types"
 561         help
 562           List additional targets to be built by the bootwrapper here (separated
 563           by spaces).  This is useful for targets that depend of device tree
 564           files in the .dts directory.
 565
 566           Targets in this list will be build as part of the default build
 567           target, or when the user does a 'make zImage' or a
 568           'make zImage.initrd'.
 569
 570           If unsure, leave blank
 571
 572 if !44x || BROKEN
 573 config ARCH_WANTS_FREEZER_CONTROL
 574         def_bool y
 575         depends on ADB_PMU
 576
 577 source kernel/power/Kconfig
 578 endif
 579
 580 config SECCOMP
 581         bool "Enable seccomp to safely compute untrusted bytecode"
 582         depends on PROC_FS
 583         default y
 584         help
 585           This kernel feature is useful for number crunching applications
 586           that may need to compute untrusted bytecode during their
 587           execution. By using pipes or other transports made available to
 588           the process as file descriptors supporting the read/write
 589           syscalls, it's possible to isolate those applications in
 590           their own address space using seccomp. Once seccomp is
 591           enabled via /proc/<pid>/seccomp, it cannot be disabled
 592           and the task is only allowed to execute a few safe syscalls
 593           defined by each seccomp mode.
 594
 595           If unsure, say Y. Only embedded should say N here.
 596
 597 endmenu
 598
 599 config ISA_DMA_API
 600         bool
 601         default !PPC_ISERIES || PCI
 602
 603 menu "Bus options"
 604
 605 config ISA
 606         bool "Support for ISA-bus hardware"
 607         depends on PPC_PREP || PPC_CHRP
 608         select PPC_I8259
 609         help
 610           Find out whether you have ISA slots on your motherboard.  ISA is the
 611           name of a bus system, i.e. the way the CPU talks to the other stuff
 612           inside your box.  If you have an Apple machine, say N here; if you
 613           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 614           you have an embedded board, consult your board documentation.
 615
 616 config ZONE_DMA
 617         bool
 618         default y
 619
 620 config GENERIC_ISA_DMA
 621         bool
 622         depends on PPC64 || POWER4 || 6xx && !CPM2
 623         default y
 624
 625 config PPC_INDIRECT_PCI
 626         bool
 627         depends on PCI
 628         default y if 40x || 44x
 629         default n
 630
 631 config EISA
 632         bool
 633
 634 config SBUS
 635         bool
 636
 637 config FSL_SOC
 638         bool
 639
 640 config FSL_PCI
 641         bool
 642         select PPC_INDIRECT_PCI
 643         select PCI_QUIRKS
 644
 645 config 4xx_SOC
 646         bool
 647
 648 config FSL_LBC
 649         bool
 650         help
 651           Freescale Localbus support
 652
 653 config FSL_GTM
 654         bool
 655         depends on PPC_83xx || QUICC_ENGINE || CPM2
 656         help
 657           Freescale General-purpose Timers support
 658
 659 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 660 config MCA
 661         bool
 662
 663 # Platforms that what PCI turned unconditionally just do select PCI
 664 # in their config node.  Platforms that want to choose at config
 665 # time should select PPC_PCI_CHOICE
 666 config PPC_PCI_CHOICE
 667         bool
 668
 669 config PCI
 670         bool "PCI support" if PPC_PCI_CHOICE
 671         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 672                 && !PPC_85xx && !PPC_86xx
 673         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 674         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 675         select ARCH_SUPPORTS_MSI
 676         help
 677           Find out whether your system includes a PCI bus. PCI is the name of
 678           a bus system, i.e. the way the CPU talks to the other stuff inside
 679           your box.  If you say Y here, the kernel will include drivers and
 680           infrastructure code to support PCI bus devices.
 681
 682 config PCI_DOMAINS
 683         def_bool PCI
 684
 685 config PCI_SYSCALL
 686         def_bool PCI
 687
 688 config PCI_QSPAN
 689         bool "QSpan PCI"
 690         depends on !4xx && !CPM2 && 8xx
 691         select PPC_I8259
 692         help
 693           Say Y here if you have a system based on a Motorola 8xx-series
 694           embedded processor with a QSPAN PCI interface, otherwise say N.
 695
 696 config PCI_8260
 697         bool
 698         depends on PCI && 8260
 699         select PPC_INDIRECT_PCI
 700         default y
 701
 702 config 8260_PCI9
 703         bool "Enable workaround for MPC826x erratum PCI 9"
 704         depends on PCI_8260 && !8272
 705         default y
 706
 707 choice
 708         prompt "IDMA channel for PCI 9 workaround"
 709         depends on 8260_PCI9
 710
 711 config 8260_PCI9_IDMA1
 712         bool "IDMA1"
 713
 714 config 8260_PCI9_IDMA2
 715         bool "IDMA2"
 716
 717 config 8260_PCI9_IDMA3
 718         bool "IDMA3"
 719
 720 config 8260_PCI9_IDMA4
 721         bool "IDMA4"
 722
 723 endchoice
 724
 725 source "drivers/pci/pcie/Kconfig"
 726
 727 source "drivers/pci/Kconfig"
 728
 729 source "drivers/pcmcia/Kconfig"
 730
 731 source "drivers/pci/hotplug/Kconfig"
 732
 733 config HAS_RAPIDIO
 734         bool
 735         default n
 736
 737 config RAPIDIO
 738         bool "RapidIO support"
 739         depends on HAS_RAPIDIO
 740         help
 741           If you say Y here, the kernel will include drivers and
 742           infrastructure code to support RapidIO interconnect devices.
 743
 744 source "drivers/rapidio/Kconfig"
 745
 746 endmenu
 747
 748 menu "Advanced setup"
 749         depends on PPC32
 750
 751 config ADVANCED_OPTIONS
 752         bool "Prompt for advanced kernel configuration options"
 753         help
 754           This option will enable prompting for a variety of advanced kernel
 755           configuration options.  These options can cause the kernel to not
 756           work if they are set incorrectly, but can be used to optimize certain
 757           aspects of kernel memory management.
 758
 759           Unless you know what you are doing, say N here.
 760
 761 comment "Default settings for advanced configuration options are used"
 762         depends on !ADVANCED_OPTIONS
 763
 764 config LOWMEM_SIZE_BOOL
 765         bool "Set maximum low memory"
 766         depends on ADVANCED_OPTIONS
 767         help
 768           This option allows you to set the maximum amount of memory which
 769           will be used as "low memory", that is, memory which the kernel can
 770           access directly, without having to set up a kernel virtual mapping.
 771           This can be useful in optimizing the layout of kernel virtual
 772           memory.
 773
 774           Say N here unless you know what you are doing.
 775
 776 config LOWMEM_SIZE
 777         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 778         default "0x30000000"
 779
 780 config LOWMEM_CAM_NUM_BOOL
 781         bool "Set number of CAMs to use to map low memory"
 782         depends on ADVANCED_OPTIONS && FSL_BOOKE
 783         help
 784           This option allows you to set the maximum number of CAM slots that
 785           will be used to map low memory.  There are a limited number of slots
 786           available and even more limited number that will fit in the L1 MMU.
 787           However, using more entries will allow mapping more low memory.  This
 788           can be useful in optimizing the layout of kernel virtual memory.
 789
 790           Say N here unless you know what you are doing.
 791
 792 config LOWMEM_CAM_NUM
 793         depends on FSL_BOOKE
 794         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 795         default 3
 796
 797 config RELOCATABLE
 798         bool "Build a relocatable kernel (EXPERIMENTAL)"
 799         depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 800         help
 801           This builds a kernel image that is capable of running at the
 802           location the kernel is loaded at (some alignment restrictions may
 803           exist).
 804
 805           One use is for the kexec on panic case where the recovery kernel
 806           must live at a different physical address than the primary
 807           kernel.
 808
 809           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 810           it has been loaded at and the compile time physical addresses
 811           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 812           setting can still be useful to bootwrappers that need to know the
 813           load location of the kernel (eg. u-boot/mkimage).
 814
 815 config PAGE_OFFSET_BOOL
 816         bool "Set custom page offset address"
 817         depends on ADVANCED_OPTIONS
 818         help
 819           This option allows you to set the kernel virtual address at which
 820           the kernel will map low memory.  This can be useful in optimizing
 821           the virtual memory layout of the system.
 822
 823           Say N here unless you know what you are doing.
 824
 825 config PAGE_OFFSET
 826         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 827         default "0xc0000000"
 828
 829 config KERNEL_START_BOOL
 830         bool "Set custom kernel base address"
 831         depends on ADVANCED_OPTIONS
 832         help
 833           This option allows you to set the kernel virtual address at which
 834           the kernel will be loaded.  Normally this should match PAGE_OFFSET
 835           however there are times (like kdump) that one might not want them
 836           to be the same.
 837
 838           Say N here unless you know what you are doing.
 839
 840 config KERNEL_START
 841         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 842         default PAGE_OFFSET if PAGE_OFFSET_BOOL
 843         default "0xc2000000" if CRASH_DUMP
 844         default "0xc0000000"
 845
 846 config PHYSICAL_START_BOOL
 847         bool "Set physical address where the kernel is loaded"
 848         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 849         help
 850           This gives the physical address where the kernel is loaded.
 851
 852           Say N here unless you know what you are doing.
 853
 854 config PHYSICAL_START
 855         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
 856         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
 857         default "0x00000000"
 858
 859 config PHYSICAL_ALIGN
 860         hex
 861         default "0x04000000" if FSL_BOOKE
 862         help
 863           This value puts the alignment restrictions on physical address
 864           where kernel is loaded and run from. Kernel is compiled for an
 865           address which meets above alignment restriction.
 866
 867 config TASK_SIZE_BOOL
 868         bool "Set custom user task size"
 869         depends on ADVANCED_OPTIONS
 870         help
 871           This option allows you to set the amount of virtual address space
 872           allocated to user tasks.  This can be useful in optimizing the
 873           virtual memory layout of the system.
 874
 875           Say N here unless you know what you are doing.
 876
 877 config TASK_SIZE
 878         hex "Size of user task space" if TASK_SIZE_BOOL
 879         default "0x80000000" if PPC_PREP || PPC_8xx
 880         default "0xc0000000"
 881
 882 config CONSISTENT_SIZE_BOOL
 883         bool "Set custom consistent memory pool size"
 884         depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
 885         help
 886           This option allows you to set the size of the
 887           consistent memory pool.  This pool of virtual memory
 888           is used to make consistent memory allocations.
 889
 890 config CONSISTENT_SIZE
 891         hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
 892         default "0x00200000" if NOT_COHERENT_CACHE
 893
 894 config PIN_TLB
 895         bool "Pinned Kernel TLBs (860 ONLY)"
 896         depends on ADVANCED_OPTIONS && 8xx
 897 endmenu
 898
 899 if PPC64
 900 config RELOCATABLE
 901         bool "Build a relocatable kernel"
 902         help
 903           This builds a kernel image that is capable of running anywhere
 904           in the RMA (real memory area) at any 16k-aligned base address.
 905           The kernel is linked as a position-independent executable (PIE)
 906           and contains dynamic relocations which are processed early
 907           in the bootup process.
 908
 909           One use is for the kexec on panic case where the recovery kernel
 910           must live at a different physical address than the primary
 911           kernel.
 912
 913 config PAGE_OFFSET
 914         hex
 915         default "0xc000000000000000"
 916 config KERNEL_START
 917         hex
 918         default "0xc000000000000000"
 919 config PHYSICAL_START
 920         hex
 921         default "0x00000000"
 922 endif
 923
 924 source "net/Kconfig"
 925
 926 source "drivers/Kconfig"
 927
 928 source "fs/Kconfig"
 929
 930 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 931
 932 source "lib/Kconfig"
 933
 934 source "arch/powerpc/Kconfig.debug"
 935
 936 source "security/Kconfig"
 937
 938 config KEYS_COMPAT
 939         bool
 940         depends on COMPAT && KEYS
 941         default y
 942
 943 source "crypto/Kconfig"
 944
 945 config PPC_CLOCK
 946         bool
 947         default n
 948         select HAVE_CLK
 949
 950 config PPC_LIB_RHEAP
 951         bool
 952
 953 source "arch/powerpc/kvm/Kconfig"