1# For a description of the syntax of this configuration file, 2# see Documentation/kbuild/kconfig-language.txt. 3# 4 5mainmenu "Linux/PowerPC Kernel Configuration" 6 7source "arch/powerpc/platforms/Kconfig.cputype" 8 9config PPC32 10 bool 11 default y if !PPC64 12 13config 64BIT 14 bool 15 default y if PPC64 16 17config WORD_SIZE 18 int 19 default 64 if PPC64 20 default 32 if !PPC64 21 22config PPC_MERGE 23 def_bool y 24 25config MMU 26 bool 27 default y 28 29config GENERIC_CMOS_UPDATE 30 def_bool y 31 32config GENERIC_TIME 33 def_bool y 34 35config GENERIC_TIME_VSYSCALL 36 def_bool y 37 38config GENERIC_CLOCKEVENTS 39 def_bool y 40 41config GENERIC_HARDIRQS 42 bool 43 default y 44 45config HAVE_SETUP_PER_CPU_AREA 46 def_bool PPC64 47 48config IRQ_PER_CPU 49 bool 50 default y 51 52config STACKTRACE_SUPPORT 53 bool 54 default y 55 56config TRACE_IRQFLAGS_SUPPORT 57 bool 58 depends on PPC64 59 default y 60 61config LOCKDEP_SUPPORT 62 bool 63 default y 64 65config RWSEM_GENERIC_SPINLOCK 66 bool 67 68config RWSEM_XCHGADD_ALGORITHM 69 bool 70 default y 71 72config GENERIC_LOCKBREAK 73 bool 74 default y 75 depends on SMP && PREEMPT 76 77config ARCH_HAS_ILOG2_U32 78 bool 79 default y 80 81config ARCH_HAS_ILOG2_U64 82 bool 83 default y if 64BIT 84 85config GENERIC_HWEIGHT 86 bool 87 default y 88 89config GENERIC_CALIBRATE_DELAY 90 bool 91 default y 92 93config GENERIC_FIND_NEXT_BIT 94 bool 95 default y 96 97config GENERIC_GPIO 98 bool 99 help 100 Generic GPIO API support 101 102config ARCH_NO_VIRT_TO_BUS 103 def_bool PPC64 104 105config PPC 106 bool 107 default y 108 select HAVE_IDE 109 select HAVE_OPROFILE 110 select HAVE_KPROBES 111 select HAVE_KRETPROBES 112 select HAVE_LMB 113 114config EARLY_PRINTK 115 bool 116 default y 117 118config COMPAT 119 bool 120 default y if PPC64 121 select COMPAT_BINFMT_ELF 122 123config SYSVIPC_COMPAT 124 bool 125 depends on COMPAT && SYSVIPC 126 default y 127 128# All PPC32s use generic nvram driver through ppc_md 129config GENERIC_NVRAM 130 bool 131 default y if PPC32 132 133config SCHED_NO_NO_OMIT_FRAME_POINTER 134 bool 135 default y 136 137config ARCH_MAY_HAVE_PC_FDC 138 bool 139 default !PPC_PSERIES || PCI 140 141config PPC_OF 142 def_bool y 143 144config OF 145 def_bool y 146 147config PPC_UDBG_16550 148 bool 149 default n 150 151config GENERIC_TBSYNC 152 bool 153 default y if PPC32 && SMP 154 default n 155 156config AUDIT_ARCH 157 bool 158 default y 159 160config GENERIC_BUG 161 bool 162 default y 163 depends on BUG 164 165config SYS_SUPPORTS_APM_EMULATION 166 default y if PMAC_APM_EMU 167 bool 168 169config DEFAULT_UIMAGE 170 bool 171 help 172 Used to allow a board to specify it wants a uImage built by default 173 default n 174 175config REDBOOT 176 bool 177 178config HIBERNATE_32 179 bool 180 depends on (PPC_PMAC && !SMP) || BROKEN 181 default y 182 183config HIBERNATE_64 184 bool 185 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL) 186 default y 187 188config ARCH_HIBERNATION_POSSIBLE 189 bool 190 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32) 191 default y 192 193config ARCH_SUSPEND_POSSIBLE 194 def_bool y 195 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 196 197config PPC_DCR_NATIVE 198 bool 199 default n 200 201config PPC_DCR_MMIO 202 bool 203 default n 204 205config PPC_DCR 206 bool 207 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 208 default y 209 210config PPC_OF_PLATFORM_PCI 211 bool 212 depends on PCI 213 depends on PPC64 # not supported on 32 bits yet 214 default n 215 216source "init/Kconfig" 217 218source "arch/powerpc/sysdev/Kconfig" 219source "arch/powerpc/platforms/Kconfig" 220 221menu "Kernel options" 222 223config HIGHMEM 224 bool "High memory support" 225 depends on PPC32 226 227source kernel/time/Kconfig 228source kernel/Kconfig.hz 229source kernel/Kconfig.preempt 230source "fs/Kconfig.binfmt" 231 232config HUGETLB_PAGE_SIZE_VARIABLE 233 bool 234 depends on HUGETLB_PAGE 235 default y 236 237config MATH_EMULATION 238 bool "Math emulation" 239 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500 240 ---help--- 241 Some PowerPC chips designed for embedded applications do not have 242 a floating-point unit and therefore do not implement the 243 floating-point instructions in the PowerPC instruction set. If you 244 say Y here, the kernel will include code to emulate a floating-point 245 unit, which will allow programs that use floating-point 246 instructions to run. 247 248config 8XX_MINIMAL_FPEMU 249 bool "Minimal math emulation for 8xx" 250 depends on 8xx && !MATH_EMULATION 251 help 252 Older arch/ppc kernels still emulated a few floating point 253 instructions such as load and store, even when full math 254 emulation is disabled. Say "Y" here if you want to preserve 255 this behavior. 256 257 It is recommended that you build a soft-float userspace instead. 258 259config IOMMU_VMERGE 260 bool "Enable IOMMU virtual merging" 261 depends on PPC64 262 default y 263 help 264 Cause IO segments sent to a device for DMA to be merged virtually 265 by the IOMMU when they happen to have been allocated contiguously. 266 This doesn't add pressure to the IOMMU allocator. However, some 267 drivers don't support getting large merged segments coming back 268 from *_map_sg(). 269 270 Most drivers don't have this problem; it is safe to say Y here. 271 272config IOMMU_HELPER 273 def_bool PPC64 274 275config HOTPLUG_CPU 276 bool "Support for enabling/disabling CPUs" 277 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC) 278 ---help--- 279 Say Y here to be able to disable and re-enable individual 280 CPUs at runtime on SMP machines. 281 282 Say N if you are unsure. 283 284config ARCH_ENABLE_MEMORY_HOTPLUG 285 def_bool y 286 287config ARCH_HAS_WALK_MEMORY 288 def_bool y 289 290config ARCH_ENABLE_MEMORY_HOTREMOVE 291 def_bool y 292 293config KEXEC 294 bool "kexec system call (EXPERIMENTAL)" 295 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL 296 help 297 kexec is a system call that implements the ability to shutdown your 298 current kernel, and to start another kernel. It is like a reboot 299 but it is independent of the system firmware. And like a reboot 300 you can start any kernel with it, not just Linux. 301 302 The name comes from the similarity to the exec system call. 303 304 It is an ongoing process to be certain the hardware in a machine 305 is properly shutdown, so do not be surprised if this code does not 306 initially work for you. It may help to enable device hotplugging 307 support. As of this writing the exact hardware interface is 308 strongly in flux, so no good recommendation can be made. 309 310config CRASH_DUMP 311 bool "Build a kdump crash kernel (EXPERIMENTAL)" 312 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL 313 help 314 Build a kernel suitable for use as a kdump capture kernel. 315 The kernel will be linked at a different address than normal, and 316 so can only be used for Kdump. 317 318 Don't change this unless you know what you are doing. 319 320config PHYP_DUMP 321 bool "Hypervisor-assisted dump (EXPERIMENTAL)" 322 depends on PPC_PSERIES && EXPERIMENTAL 323 help 324 Hypervisor-assisted dump is meant to be a kdump replacement 325 offering robustness and speed not possible without system 326 hypervisor assistence. 327 328 If unsure, say "N" 329 330config PPCBUG_NVRAM 331 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC 332 default y if PPC_PREP 333 334config IRQ_ALL_CPUS 335 bool "Distribute interrupts on all CPUs by default" 336 depends on SMP && !MV64360 337 help 338 This option gives the kernel permission to distribute IRQs across 339 multiple CPUs. Saying N here will route all IRQs to the first 340 CPU. Generally saying Y is safe, although some problems have been 341 reported with SMP Power Macintoshes with this option enabled. 342 343config NUMA 344 bool "NUMA support" 345 depends on PPC64 346 default y if SMP && PPC_PSERIES 347 348config NODES_SHIFT 349 int 350 default "4" 351 depends on NEED_MULTIPLE_NODES 352 353config ARCH_SELECT_MEMORY_MODEL 354 def_bool y 355 depends on PPC64 356 357config ARCH_FLATMEM_ENABLE 358 def_bool y 359 depends on (PPC64 && !NUMA) || PPC32 360 361config ARCH_SPARSEMEM_ENABLE 362 def_bool y 363 depends on PPC64 364 select SPARSEMEM_VMEMMAP_ENABLE 365 366config ARCH_SPARSEMEM_DEFAULT 367 def_bool y 368 depends on (SMP && PPC_PSERIES) || PPC_PS3 369 370config ARCH_POPULATES_NODE_MAP 371 def_bool y 372 373source "mm/Kconfig" 374 375config ARCH_MEMORY_PROBE 376 def_bool y 377 depends on MEMORY_HOTPLUG 378 379# Some NUMA nodes have memory ranges that span 380# other nodes. Even though a pfn is valid and 381# between a node's start and end pfns, it may not 382# reside on that node. See memmap_init_zone() 383# for details. 384config NODES_SPAN_OTHER_NODES 385 def_bool y 386 depends on NEED_MULTIPLE_NODES 387 388config PPC_HAS_HASH_64K 389 bool 390 depends on PPC64 391 default n 392 393config PPC_64K_PAGES 394 bool "64k page size" 395 depends on PPC64 396 select PPC_HAS_HASH_64K 397 help 398 This option changes the kernel logical page size to 64k. On machines 399 without processor support for 64k pages, the kernel will simulate 400 them by loading each individual 4k page on demand transparently, 401 while on hardware with such support, it will be used to map 402 normal application pages. 403 404config FORCE_MAX_ZONEORDER 405 int "Maximum zone order" 406 default "9" if PPC_64K_PAGES 407 default "13" if PPC64 && !PPC_64K_PAGES 408 default "11" 409 help 410 The kernel memory allocator divides physically contiguous memory 411 blocks into "zones", where each zone is a power of two number of 412 pages. This option selects the largest power of two that the kernel 413 keeps in the memory allocator. If you need to allocate very large 414 blocks of physically contiguous memory, then you may need to 415 increase this value. 416 417 This config option is actually maximum order plus one. For example, 418 a value of 11 means that the largest free memory block is 2^10 pages. 419 420 The page size is not necessarily 4KB. For example, on 64-bit 421 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 422 this in mind when choosing a value for this option. 423 424config PPC_SUBPAGE_PROT 425 bool "Support setting protections for 4k subpages" 426 depends on PPC_64K_PAGES 427 help 428 This option adds support for a system call to allow user programs 429 to set access permissions (read/write, readonly, or no access) 430 on the 4k subpages of each 64k page. 431 432config SCHED_SMT 433 bool "SMT (Hyperthreading) scheduler support" 434 depends on PPC64 && SMP 435 help 436 SMT scheduler support improves the CPU scheduler's decision making 437 when dealing with POWER5 cpus at a cost of slightly increased 438 overhead in some places. If unsure say N here. 439 440config PROC_DEVICETREE 441 bool "Support for device tree in /proc" 442 depends on PROC_FS 443 help 444 This option adds a device-tree directory under /proc which contains 445 an image of the device tree that the kernel copies from Open 446 Firmware or other boot firmware. If unsure, say Y here. 447 448config CMDLINE_BOOL 449 bool "Default bootloader kernel arguments" 450 451config CMDLINE 452 string "Initial kernel command string" 453 depends on CMDLINE_BOOL 454 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 455 help 456 On some platforms, there is currently no way for the boot loader to 457 pass arguments to the kernel. For these platforms, you can supply 458 some command-line options at build time by entering them here. In 459 most cases you will need to specify the root device here. 460 461if !44x || BROKEN 462config ARCH_WANTS_FREEZER_CONTROL 463 def_bool y 464 depends on ADB_PMU 465 466source kernel/power/Kconfig 467endif 468 469config SECCOMP 470 bool "Enable seccomp to safely compute untrusted bytecode" 471 depends on PROC_FS 472 default y 473 help 474 This kernel feature is useful for number crunching applications 475 that may need to compute untrusted bytecode during their 476 execution. By using pipes or other transports made available to 477 the process as file descriptors supporting the read/write 478 syscalls, it's possible to isolate those applications in 479 their own address space using seccomp. Once seccomp is 480 enabled via /proc/<pid>/seccomp, it cannot be disabled 481 and the task is only allowed to execute a few safe syscalls 482 defined by each seccomp mode. 483 484 If unsure, say Y. Only embedded should say N here. 485 486endmenu 487 488config ISA_DMA_API 489 bool 490 default !PPC_ISERIES || PCI 491 492menu "Bus options" 493 494config ISA 495 bool "Support for ISA-bus hardware" 496 depends on PPC_PREP || PPC_CHRP 497 select PPC_I8259 498 help 499 Find out whether you have ISA slots on your motherboard. ISA is the 500 name of a bus system, i.e. the way the CPU talks to the other stuff 501 inside your box. If you have an Apple machine, say N here; if you 502 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If 503 you have an embedded board, consult your board documentation. 504 505config ZONE_DMA 506 bool 507 default y 508 509config GENERIC_ISA_DMA 510 bool 511 depends on PPC64 || POWER4 || 6xx && !CPM2 512 default y 513 514config PPC_INDIRECT_PCI 515 bool 516 depends on PCI 517 default y if 40x || 44x 518 default n 519 520config EISA 521 bool 522 523config SBUS 524 bool 525 526config FSL_SOC 527 bool 528 529config FSL_PCI 530 bool 531 select PPC_INDIRECT_PCI 532 533config 4xx_SOC 534 bool 535 536config FSL_LBC 537 bool 538 help 539 Freescale Localbus support 540 541# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 542config MCA 543 bool 544 545config PCI 546 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \ 547 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \ 548 || PPC_PS3 || 44x 549 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \ 550 && !PPC_85xx && !PPC_86xx 551 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx 552 default PCI_QSPAN if !4xx && !CPM2 && 8xx 553 select ARCH_SUPPORTS_MSI 554 help 555 Find out whether your system includes a PCI bus. PCI is the name of 556 a bus system, i.e. the way the CPU talks to the other stuff inside 557 your box. If you say Y here, the kernel will include drivers and 558 infrastructure code to support PCI bus devices. 559 560config PCI_DOMAINS 561 def_bool PCI 562 563config PCI_SYSCALL 564 def_bool PCI 565 566config PCI_QSPAN 567 bool "QSpan PCI" 568 depends on !4xx && !CPM2 && 8xx 569 select PPC_I8259 570 help 571 Say Y here if you have a system based on a Motorola 8xx-series 572 embedded processor with a QSPAN PCI interface, otherwise say N. 573 574config PCI_8260 575 bool 576 depends on PCI && 8260 577 select PPC_INDIRECT_PCI 578 default y 579 580config 8260_PCI9 581 bool "Enable workaround for MPC826x erratum PCI 9" 582 depends on PCI_8260 && !8272 583 default y 584 585choice 586 prompt "IDMA channel for PCI 9 workaround" 587 depends on 8260_PCI9 588 589config 8260_PCI9_IDMA1 590 bool "IDMA1" 591 592config 8260_PCI9_IDMA2 593 bool "IDMA2" 594 595config 8260_PCI9_IDMA3 596 bool "IDMA3" 597 598config 8260_PCI9_IDMA4 599 bool "IDMA4" 600 601endchoice 602 603source "drivers/pci/pcie/Kconfig" 604 605source "drivers/pci/Kconfig" 606 607source "drivers/pcmcia/Kconfig" 608 609source "drivers/pci/hotplug/Kconfig" 610 611config HAS_RAPIDIO 612 bool 613 default n 614 615config RAPIDIO 616 bool "RapidIO support" 617 depends on HAS_RAPIDIO 618 help 619 If you say Y here, the kernel will include drivers and 620 infrastructure code to support RapidIO interconnect devices. 621 622source "drivers/rapidio/Kconfig" 623 624endmenu 625 626menu "Advanced setup" 627 depends on PPC32 628 629config ADVANCED_OPTIONS 630 bool "Prompt for advanced kernel configuration options" 631 help 632 This option will enable prompting for a variety of advanced kernel 633 configuration options. These options can cause the kernel to not 634 work if they are set incorrectly, but can be used to optimize certain 635 aspects of kernel memory management. 636 637 Unless you know what you are doing, say N here. 638 639comment "Default settings for advanced configuration options are used" 640 depends on !ADVANCED_OPTIONS 641 642config LOWMEM_SIZE_BOOL 643 bool "Set maximum low memory" 644 depends on ADVANCED_OPTIONS 645 help 646 This option allows you to set the maximum amount of memory which 647 will be used as "low memory", that is, memory which the kernel can 648 access directly, without having to set up a kernel virtual mapping. 649 This can be useful in optimizing the layout of kernel virtual 650 memory. 651 652 Say N here unless you know what you are doing. 653 654config LOWMEM_SIZE 655 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 656 default "0x30000000" 657 658config RELOCATABLE 659 bool "Build a relocatable kernel (EXPERIMENTAL)" 660 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 661 help 662 This builds a kernel image that is capable of running at the 663 location the kernel is loaded at (some alignment restrictions may 664 exist). 665 666 One use is for the kexec on panic case where the recovery kernel 667 must live at a different physical address than the primary 668 kernel. 669 670 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 671 it has been loaded at and the compile time physical addresses 672 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 673 setting can still be useful to bootwrappers that need to know the 674 load location of the kernel (eg. u-boot/mkimage). 675 676config PAGE_OFFSET_BOOL 677 bool "Set custom page offset address" 678 depends on ADVANCED_OPTIONS 679 help 680 This option allows you to set the kernel virtual address at which 681 the kernel will map low memory. This can be useful in optimizing 682 the virtual memory layout of the system. 683 684 Say N here unless you know what you are doing. 685 686config PAGE_OFFSET 687 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 688 default "0xc0000000" 689 690config KERNEL_START_BOOL 691 bool "Set custom kernel base address" 692 depends on ADVANCED_OPTIONS 693 help 694 This option allows you to set the kernel virtual address at which 695 the kernel will be loaded. Normally this should match PAGE_OFFSET 696 however there are times (like kdump) that one might not want them 697 to be the same. 698 699 Say N here unless you know what you are doing. 700 701config KERNEL_START 702 hex "Virtual address of kernel base" if KERNEL_START_BOOL 703 default PAGE_OFFSET if PAGE_OFFSET_BOOL 704 default "0xc2000000" if CRASH_DUMP 705 default "0xc0000000" 706 707config PHYSICAL_START_BOOL 708 bool "Set physical address where the kernel is loaded" 709 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 710 help 711 This gives the physical address where the kernel is loaded. 712 713 Say N here unless you know what you are doing. 714 715config PHYSICAL_START 716 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 717 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP 718 default "0x00000000" 719 720config PHYSICAL_ALIGN 721 hex 722 default "0x10000000" if FSL_BOOKE 723 help 724 This value puts the alignment restrictions on physical address 725 where kernel is loaded and run from. Kernel is compiled for an 726 address which meets above alignment restriction. 727 728config TASK_SIZE_BOOL 729 bool "Set custom user task size" 730 depends on ADVANCED_OPTIONS 731 help 732 This option allows you to set the amount of virtual address space 733 allocated to user tasks. This can be useful in optimizing the 734 virtual memory layout of the system. 735 736 Say N here unless you know what you are doing. 737 738config TASK_SIZE 739 hex "Size of user task space" if TASK_SIZE_BOOL 740 default "0x80000000" if PPC_PREP || PPC_8xx 741 default "0xc0000000" 742 743config CONSISTENT_START_BOOL 744 bool "Set custom consistent memory pool address" 745 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 746 help 747 This option allows you to set the base virtual address 748 of the consistent memory pool. This pool of virtual 749 memory is used to make consistent memory allocations. 750 751config CONSISTENT_START 752 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL 753 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx) 754 default "0xff100000" if NOT_COHERENT_CACHE 755 756config CONSISTENT_SIZE_BOOL 757 bool "Set custom consistent memory pool size" 758 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 759 help 760 This option allows you to set the size of the 761 consistent memory pool. This pool of virtual memory 762 is used to make consistent memory allocations. 763 764config CONSISTENT_SIZE 765 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 766 default "0x00200000" if NOT_COHERENT_CACHE 767 768config PIN_TLB 769 bool "Pinned Kernel TLBs (860 ONLY)" 770 depends on ADVANCED_OPTIONS && 8xx 771endmenu 772 773if PPC64 774config PAGE_OFFSET 775 hex 776 default "0xc000000000000000" 777config KERNEL_START 778 hex 779 default "0xc000000002000000" if CRASH_DUMP 780 default "0xc000000000000000" 781config PHYSICAL_START 782 hex 783 default "0x02000000" if CRASH_DUMP 784 default "0x00000000" 785endif 786 787source "net/Kconfig" 788 789source "drivers/Kconfig" 790 791source "fs/Kconfig" 792 793# XXX source "arch/ppc/8xx_io/Kconfig" 794 795# XXX source "arch/ppc/8260_io/Kconfig" 796 797source "arch/powerpc/sysdev/qe_lib/Kconfig" 798 799source "lib/Kconfig" 800 801source "arch/powerpc/Kconfig.debug" 802 803source "security/Kconfig" 804 805config KEYS_COMPAT 806 bool 807 depends on COMPAT && KEYS 808 default y 809 810source "crypto/Kconfig" 811 812config PPC_CLOCK 813 bool 814 default n 815 816config PPC_LIB_RHEAP 817 bool 818 819source "arch/powerpc/kvm/Kconfig" 820