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 source "init/Kconfig"
 232
 233 source "kernel/Kconfig.freezer"
 234
 235 source "arch/powerpc/sysdev/Kconfig"
 236 source "arch/powerpc/platforms/Kconfig"
 237
 238 menu "Kernel options"
 239
 240 config HIGHMEM
 241         bool "High memory support"
 242         depends on PPC32
 243
 244 source kernel/time/Kconfig
 245 source kernel/Kconfig.hz
 246 source kernel/Kconfig.preempt
 247 source "fs/Kconfig.binfmt"
 248
 249 config HUGETLB_PAGE_SIZE_VARIABLE
 250         bool
 251         depends on HUGETLB_PAGE
 252         default y
 253
 254 config MATH_EMULATION
 255         bool "Math emulation"
 256         depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
 257         ---help---
 258           Some PowerPC chips designed for embedded applications do not have
 259           a floating-point unit and therefore do not implement the
 260           floating-point instructions in the PowerPC instruction set.  If you
 261           say Y here, the kernel will include code to emulate a floating-point
 262           unit, which will allow programs that use floating-point
 263           instructions to run.
 264
 265 config 8XX_MINIMAL_FPEMU
 266         bool "Minimal math emulation for 8xx"
 267         depends on 8xx && !MATH_EMULATION
 268         help
 269           Older arch/ppc kernels still emulated a few floating point
 270           instructions such as load and store, even when full math
 271           emulation is disabled.  Say "Y" here if you want to preserve
 272           this behavior.
 273
 274           It is recommended that you build a soft-float userspace instead.
 275
 276 config IOMMU_VMERGE
 277         bool "Enable IOMMU virtual merging"
 278         depends on PPC64
 279         default y
 280         help
 281           Cause IO segments sent to a device for DMA to be merged virtually
 282           by the IOMMU when they happen to have been allocated contiguously.
 283           This doesn't add pressure to the IOMMU allocator. However, some
 284           drivers don't support getting large merged segments coming back
 285           from *_map_sg().
 286
 287           Most drivers don't have this problem; it is safe to say Y here.
 288
 289 config IOMMU_HELPER
 290         def_bool PPC64
 291
 292 config PPC_NEED_DMA_SYNC_OPS
 293         def_bool y
 294         depends on NOT_COHERENT_CACHE
 295
 296 config HOTPLUG_CPU
 297         bool "Support for enabling/disabling CPUs"
 298         depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
 299         ---help---
 300           Say Y here to be able to disable and re-enable individual
 301           CPUs at runtime on SMP machines.
 302
 303           Say N if you are unsure.
 304
 305 config ARCH_ENABLE_MEMORY_HOTPLUG
 306         def_bool y
 307
 308 config ARCH_HAS_WALK_MEMORY
 309         def_bool y
 310
 311 config ARCH_ENABLE_MEMORY_HOTREMOVE
 312         def_bool y
 313
 314 config KEXEC
 315         bool "kexec system call (EXPERIMENTAL)"
 316         depends on BOOK3S && EXPERIMENTAL
 317         help
 318           kexec is a system call that implements the ability to shutdown your
 319           current kernel, and to start another kernel.  It is like a reboot
 320           but it is independent of the system firmware.   And like a reboot
 321           you can start any kernel with it, not just Linux.
 322
 323           The name comes from the similarity to the exec system call.
 324
 325           It is an ongoing process to be certain the hardware in a machine
 326           is properly shutdown, so do not be surprised if this code does not
 327           initially work for you.  It may help to enable device hotplugging
 328           support.  As of this writing the exact hardware interface is
 329           strongly in flux, so no good recommendation can be made.
 330
 331 config CRASH_DUMP
 332         bool "Build a kdump crash kernel"
 333         depends on PPC64 || 6xx
 334         select RELOCATABLE if PPC64
 335         help
 336           Build a kernel suitable for use as a kdump capture kernel.
 337           The same kernel binary can be used as production kernel and dump
 338           capture kernel.
 339
 340 config PHYP_DUMP
 341         bool "Hypervisor-assisted dump (EXPERIMENTAL)"
 342         depends on PPC_PSERIES && EXPERIMENTAL
 343         help
 344           Hypervisor-assisted dump is meant to be a kdump replacement
 345           offering robustness and speed not possible without system
 346           hypervisor assistence.
 347
 348           If unsure, say "N"
 349
 350 config PPCBUG_NVRAM
 351         bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 352         default y if PPC_PREP
 353
 354 config IRQ_ALL_CPUS
 355         bool "Distribute interrupts on all CPUs by default"
 356         depends on SMP && !MV64360
 357         help
 358           This option gives the kernel permission to distribute IRQs across
 359           multiple CPUs.  Saying N here will route all IRQs to the first
 360           CPU.  Generally saying Y is safe, although some problems have been
 361           reported with SMP Power Macintoshes with this option enabled.
 362
 363 config NUMA
 364         bool "NUMA support"
 365         depends on PPC64
 366         default y if SMP && PPC_PSERIES
 367
 368 config NODES_SHIFT
 369         int
 370         default "4"
 371         depends on NEED_MULTIPLE_NODES
 372
 373 config ARCH_SELECT_MEMORY_MODEL
 374         def_bool y
 375         depends on PPC64
 376
 377 config ARCH_FLATMEM_ENABLE
 378         def_bool y
 379         depends on (PPC64 && !NUMA) || PPC32
 380
 381 config ARCH_SPARSEMEM_ENABLE
 382         def_bool y
 383         depends on PPC64
 384         select SPARSEMEM_VMEMMAP_ENABLE
 385
 386 config ARCH_SPARSEMEM_DEFAULT
 387         def_bool y
 388         depends on (SMP && PPC_PSERIES) || PPC_PS3
 389
 390 config ARCH_POPULATES_NODE_MAP
 391         def_bool y
 392
 393 source "mm/Kconfig"
 394
 395 config ARCH_MEMORY_PROBE
 396         def_bool y
 397         depends on MEMORY_HOTPLUG
 398
 399 # Some NUMA nodes have memory ranges that span
 400 # other nodes.  Even though a pfn is valid and
 401 # between a node's start and end pfns, it may not
 402 # reside on that node.  See memmap_init_zone()
 403 # for details.
 404 config NODES_SPAN_OTHER_NODES
 405         def_bool y
 406         depends on NEED_MULTIPLE_NODES
 407
 408 config PPC_HAS_HASH_64K
 409         bool
 410         depends on PPC64
 411         default n
 412
 413 config STDBINUTILS
 414         bool "Using standard binutils settings"
 415         depends on 44x
 416         default y
 417         help
 418           Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
 419           Note, that kernel will be able to run only those applications,
 420           which had been compiled using binutils later than 2.17.50.0.3 with
 421           '-zmax-page-size' set to 256K (the default is 64K). Or, if using
 422           the older binutils, you can patch them with a trivial patch, which
 423           changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
 424
 425 choice
 426         prompt "Page size"
 427         default PPC_4K_PAGES
 428         help
 429           Select the kernel logical page size. Increasing the page size
 430           will reduce software overhead at each page boundary, allow
 431           hardware prefetch mechanisms to be more effective, and allow
 432           larger dma transfers increasing IO efficiency and reducing
 433           overhead. However the utilization of memory will increase.
 434           For example, each cached file will using a multiple of the
 435           page size to hold its contents and the difference between the
 436           end of file and the end of page is wasted.
 437
 438           Some dedicated systems, such as software raid serving with
 439           accelerated calculations, have shown significant increases.
 440
 441           If you configure a 64 bit kernel for 64k pages but the
 442           processor does not support them, then the kernel will simulate
 443           them with 4k pages, loading them on demand, but with the
 444           reduced software overhead and larger internal fragmentation.
 445           For the 32 bit kernel, a large page option will not be offered
 446           unless it is supported by the configured processor.
 447
 448           If unsure, choose 4K_PAGES.
 449
 450 config PPC_4K_PAGES
 451         bool "4k page size"
 452
 453 config PPC_16K_PAGES
 454         bool "16k page size" if 44x
 455
 456 config PPC_64K_PAGES
 457         bool "64k page size" if 44x || PPC_STD_MMU_64
 458         select PPC_HAS_HASH_64K if PPC_STD_MMU_64
 459
 460 config PPC_256K_PAGES
 461         bool "256k page size" if 44x
 462         depends on !STDBINUTILS && (!SHMEM || BROKEN)
 463         help
 464           Make the page size 256k.
 465
 466           As the ELF standard only requires alignment to support page
 467           sizes up to 64k, you will need to compile all of your user
 468           space applications with a non-standard binutils settings
 469           (see the STDBINUTILS description for details).
 470
 471           Say N unless you know what you are doing.
 472
 473 endchoice
 474
 475 config FORCE_MAX_ZONEORDER
 476         int "Maximum zone order"
 477         range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
 478         default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
 479         range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
 480         default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
 481         range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
 482         default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
 483         range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
 484         default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
 485         range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
 486         default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
 487         range 11 64
 488         default "11"
 489         help
 490           The kernel memory allocator divides physically contiguous memory
 491           blocks into "zones", where each zone is a power of two number of
 492           pages.  This option selects the largest power of two that the kernel
 493           keeps in the memory allocator.  If you need to allocate very large
 494           blocks of physically contiguous memory, then you may need to
 495           increase this value.
 496
 497           This config option is actually maximum order plus one. For example,
 498           a value of 11 means that the largest free memory block is 2^10 pages.
 499
 500           The page size is not necessarily 4KB.  For example, on 64-bit
 501           systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep
 502           this in mind when choosing a value for this option.
 503
 504 config PPC_SUBPAGE_PROT
 505         bool "Support setting protections for 4k subpages"
 506         depends on PPC_STD_MMU_64 && PPC_64K_PAGES
 507         help
 508           This option adds support for a system call to allow user programs
 509           to set access permissions (read/write, readonly, or no access)
 510           on the 4k subpages of each 64k page.
 511
 512 config SCHED_SMT
 513         bool "SMT (Hyperthreading) scheduler support"
 514         depends on PPC64 && SMP
 515         help
 516           SMT scheduler support improves the CPU scheduler's decision making
 517           when dealing with POWER5 cpus at a cost of slightly increased
 518           overhead in some places. If unsure say N here.
 519
 520 config PROC_DEVICETREE
 521         bool "Support for device tree in /proc"
 522         depends on PROC_FS
 523         help
 524           This option adds a device-tree directory under /proc which contains
 525           an image of the device tree that the kernel copies from Open
 526           Firmware or other boot firmware. If unsure, say Y here.
 527
 528 config CMDLINE_BOOL
 529         bool "Default bootloader kernel arguments"
 530
 531 config CMDLINE
 532         string "Initial kernel command string"
 533         depends on CMDLINE_BOOL
 534         default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
 535         help
 536           On some platforms, there is currently no way for the boot loader to
 537           pass arguments to the kernel. For these platforms, you can supply
 538           some command-line options at build time by entering them here.  In
 539           most cases you will need to specify the root device here.
 540
 541 config EXTRA_TARGETS
 542         string "Additional default image types"
 543         help
 544           List additional targets to be built by the bootwrapper here (separated
 545           by spaces).  This is useful for targets that depend of device tree
 546           files in the .dts directory.
 547
 548           Targets in this list will be build as part of the default build
 549           target, or when the user does a 'make zImage' or a
 550           'make zImage.initrd'.
 551
 552           If unsure, leave blank
 553
 554 if !44x || BROKEN
 555 config ARCH_WANTS_FREEZER_CONTROL
 556         def_bool y
 557         depends on ADB_PMU
 558
 559 source kernel/power/Kconfig
 560 endif
 561
 562 config SECCOMP
 563         bool "Enable seccomp to safely compute untrusted bytecode"
 564         depends on PROC_FS
 565         default y
 566         help
 567           This kernel feature is useful for number crunching applications
 568           that may need to compute untrusted bytecode during their
 569           execution. By using pipes or other transports made available to
 570           the process as file descriptors supporting the read/write
 571           syscalls, it's possible to isolate those applications in
 572           their own address space using seccomp. Once seccomp is
 573           enabled via /proc/<pid>/seccomp, it cannot be disabled
 574           and the task is only allowed to execute a few safe syscalls
 575           defined by each seccomp mode.
 576
 577           If unsure, say Y. Only embedded should say N here.
 578
 579 endmenu
 580
 581 config ISA_DMA_API
 582         bool
 583         default !PPC_ISERIES || PCI
 584
 585 menu "Bus options"
 586
 587 config ISA
 588         bool "Support for ISA-bus hardware"
 589         depends on PPC_PREP || PPC_CHRP
 590         select PPC_I8259
 591         help
 592           Find out whether you have ISA slots on your motherboard.  ISA is the
 593           name of a bus system, i.e. the way the CPU talks to the other stuff
 594           inside your box.  If you have an Apple machine, say N here; if you
 595           have an IBM RS/6000 or pSeries machine or a PReP machine, say Y.  If
 596           you have an embedded board, consult your board documentation.
 597
 598 config ZONE_DMA
 599         bool
 600         default y
 601
 602 config GENERIC_ISA_DMA
 603         bool
 604         depends on PPC64 || POWER4 || 6xx && !CPM2
 605         default y
 606
 607 config PPC_INDIRECT_PCI
 608         bool
 609         depends on PCI
 610         default y if 40x || 44x
 611         default n
 612
 613 config EISA
 614         bool
 615
 616 config SBUS
 617         bool
 618
 619 config FSL_SOC
 620         bool
 621
 622 config FSL_PCI
 623         bool
 624         select PPC_INDIRECT_PCI
 625         select PCI_QUIRKS
 626
 627 config 4xx_SOC
 628         bool
 629
 630 config FSL_LBC
 631         bool
 632         help
 633           Freescale Localbus support
 634
 635 config FSL_GTM
 636         bool
 637         depends on PPC_83xx || QUICC_ENGINE || CPM2
 638         help
 639           Freescale General-purpose Timers support
 640
 641 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
 642 config MCA
 643         bool
 644
 645 # Platforms that what PCI turned unconditionally just do select PCI
 646 # in their config node.  Platforms that want to choose at config
 647 # time should select PPC_PCI_CHOICE
 648 config PPC_PCI_CHOICE
 649         bool
 650
 651 config PCI
 652         bool "PCI support" if PPC_PCI_CHOICE
 653         default y if !40x && !CPM2 && !8xx && !PPC_83xx \
 654                 && !PPC_85xx && !PPC_86xx
 655         default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
 656         default PCI_QSPAN if !4xx && !CPM2 && 8xx
 657         select ARCH_SUPPORTS_MSI
 658         help
 659           Find out whether your system includes a PCI bus. PCI is the name of
 660           a bus system, i.e. the way the CPU talks to the other stuff inside
 661           your box.  If you say Y here, the kernel will include drivers and
 662           infrastructure code to support PCI bus devices.
 663
 664 config PCI_DOMAINS
 665         def_bool PCI
 666
 667 config PCI_SYSCALL
 668         def_bool PCI
 669
 670 config PCI_QSPAN
 671         bool "QSpan PCI"
 672         depends on !4xx && !CPM2 && 8xx
 673         select PPC_I8259
 674         help
 675           Say Y here if you have a system based on a Motorola 8xx-series
 676           embedded processor with a QSPAN PCI interface, otherwise say N.
 677
 678 config PCI_8260
 679         bool
 680         depends on PCI && 8260
 681         select PPC_INDIRECT_PCI
 682         default y
 683
 684 config 8260_PCI9
 685         bool "Enable workaround for MPC826x erratum PCI 9"
 686         depends on PCI_8260 && !8272
 687         default y
 688
 689 choice
 690         prompt "IDMA channel for PCI 9 workaround"
 691         depends on 8260_PCI9
 692
 693 config 8260_PCI9_IDMA1
 694         bool "IDMA1"
 695
 696 config 8260_PCI9_IDMA2
 697         bool "IDMA2"
 698
 699 config 8260_PCI9_IDMA3
 700         bool "IDMA3"
 701
 702 config 8260_PCI9_IDMA4
 703         bool "IDMA4"
 704
 705 endchoice
 706
 707 source "drivers/pci/pcie/Kconfig"
 708
 709 source "drivers/pci/Kconfig"
 710
 711 source "drivers/pcmcia/Kconfig"
 712
 713 source "drivers/pci/hotplug/Kconfig"
 714
 715 config HAS_RAPIDIO
 716         bool
 717         default n
 718
 719 config RAPIDIO
 720         bool "RapidIO support"
 721         depends on HAS_RAPIDIO
 722         help
 723           If you say Y here, the kernel will include drivers and
 724           infrastructure code to support RapidIO interconnect devices.
 725
 726 source "drivers/rapidio/Kconfig"
 727
 728 endmenu
 729
 730 menu "Advanced setup"
 731         depends on PPC32
 732
 733 config ADVANCED_OPTIONS
 734         bool "Prompt for advanced kernel configuration options"
 735         help
 736           This option will enable prompting for a variety of advanced kernel
 737           configuration options.  These options can cause the kernel to not
 738           work if they are set incorrectly, but can be used to optimize certain
 739           aspects of kernel memory management.
 740
 741           Unless you know what you are doing, say N here.
 742
 743 comment "Default settings for advanced configuration options are used"
 744         depends on !ADVANCED_OPTIONS
 745
 746 config LOWMEM_SIZE_BOOL
 747         bool "Set maximum low memory"
 748         depends on ADVANCED_OPTIONS
 749         help
 750           This option allows you to set the maximum amount of memory which
 751           will be used as "low memory", that is, memory which the kernel can
 752           access directly, without having to set up a kernel virtual mapping.
 753           This can be useful in optimizing the layout of kernel virtual
 754           memory.
 755
 756           Say N here unless you know what you are doing.
 757
 758 config LOWMEM_SIZE
 759         hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
 760         default "0x30000000"
 761
 762 config LOWMEM_CAM_NUM_BOOL
 763         bool "Set number of CAMs to use to map low memory"
 764         depends on ADVANCED_OPTIONS && FSL_BOOKE
 765         help
 766           This option allows you to set the maximum number of CAM slots that
 767           will be used to map low memory.  There are a limited number of slots
 768           available and even more limited number that will fit in the L1 MMU.
 769           However, using more entries will allow mapping more low memory.  This
 770           can be useful in optimizing the layout of kernel virtual memory.
 771
 772           Say N here unless you know what you are doing.
 773
 774 config LOWMEM_CAM_NUM
 775         int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
 776         default 3
 777
 778 config RELOCATABLE
 779         bool "Build a relocatable kernel (EXPERIMENTAL)"
 780         depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 781         help
 782           This builds a kernel image that is capable of running at the
 783           location the kernel is loaded at (some alignment restrictions may
 784           exist).
 785
 786           One use is for the kexec on panic case where the recovery kernel
 787           must live at a different physical address than the primary
 788           kernel.
 789
 790           Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
 791           it has been loaded at and the compile time physical addresses
 792           CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START
 793           setting can still be useful to bootwrappers that need to know the
 794           load location of the kernel (eg. u-boot/mkimage).
 795
 796 config PAGE_OFFSET_BOOL
 797         bool "Set custom page offset address"
 798         depends on ADVANCED_OPTIONS
 799         help
 800           This option allows you to set the kernel virtual address at which
 801           the kernel will map low memory.  This can be useful in optimizing
 802           the virtual memory layout of the system.
 803
 804           Say N here unless you know what you are doing.
 805
 806 config PAGE_OFFSET
 807         hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
 808         default "0xc0000000"
 809
 810 config KERNEL_START_BOOL
 811         bool "Set custom kernel base address"
 812         depends on ADVANCED_OPTIONS
 813         help
 814           This option allows you to set the kernel virtual address at which
 815           the kernel will be loaded.  Normally this should match PAGE_OFFSET
 816           however there are times (like kdump) that one might not want them
 817           to be the same.
 818
 819           Say N here unless you know what you are doing.
 820
 821 config KERNEL_START
 822         hex "Virtual address of kernel base" if KERNEL_START_BOOL
 823         default PAGE_OFFSET if PAGE_OFFSET_BOOL
 824         default "0xc2000000" if CRASH_DUMP
 825         default "0xc0000000"
 826
 827 config PHYSICAL_START_BOOL
 828         bool "Set physical address where the kernel is loaded"
 829         depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
 830         help
 831           This gives the physical address where the kernel is loaded.
 832
 833           Say N here unless you know what you are doing.
 834
 835 config PHYSICAL_START
 836         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
 837         default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
 838         default "0x00000000"
 839
 840 config PHYSICAL_ALIGN
 841         hex
 842         default "0x04000000" if FSL_BOOKE
 843         help
 844           This value puts the alignment restrictions on physical address
 845           where kernel is loaded and run from. Kernel is compiled for an
 846           address which meets above alignment restriction.
 847
 848 config TASK_SIZE_BOOL
 849         bool "Set custom user task size"
 850         depends on ADVANCED_OPTIONS
 851         help
 852           This option allows you to set the amount of virtual address space
 853           allocated to user tasks.  This can be useful in optimizing the
 854           virtual memory layout of the system.
 855
 856           Say N here unless you know what you are doing.
 857
 858 config TASK_SIZE
 859         hex "Size of user task space" if TASK_SIZE_BOOL
 860         default "0x80000000" if PPC_PREP || PPC_8xx
 861         default "0xc0000000"
 862
 863 config PIN_TLB
 864         bool "Pinned Kernel TLBs (860 ONLY)"
 865         depends on ADVANCED_OPTIONS && 8xx
 866 endmenu
 867
 868 if PPC64
 869 config RELOCATABLE
 870         bool "Build a relocatable kernel"
 871         help
 872           This builds a kernel image that is capable of running anywhere
 873           in the RMA (real memory area) at any 16k-aligned base address.
 874           The kernel is linked as a position-independent executable (PIE)
 875           and contains dynamic relocations which are processed early
 876           in the bootup process.
 877
 878           One use is for the kexec on panic case where the recovery kernel
 879           must live at a different physical address than the primary
 880           kernel.
 881
 882 config PAGE_OFFSET
 883         hex
 884         default "0xc000000000000000"
 885 config KERNEL_START
 886         hex
 887         default "0xc000000000000000"
 888 config PHYSICAL_START
 889         hex
 890         default "0x00000000"
 891 endif
 892
 893 source "net/Kconfig"
 894
 895 source "drivers/Kconfig"
 896
 897 source "fs/Kconfig"
 898
 899 source "arch/powerpc/sysdev/qe_lib/Kconfig"
 900
 901 source "lib/Kconfig"
 902
 903 source "arch/powerpc/Kconfig.debug"
 904
 905 source "security/Kconfig"
 906
 907 config KEYS_COMPAT
 908         bool
 909         depends on COMPAT && KEYS
 910         default y
 911
 912 source "crypto/Kconfig"
 913
 914 config PPC_CLOCK
 915         bool
 916         default n
 917         select HAVE_CLK
 918
 919 config PPC_LIB_RHEAP
 920         bool
 921
 922 source "arch/powerpc/kvm/Kconfig"