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 HAVE_LATENCYTOP_SUPPORT 57 def_bool y 58 59config TRACE_IRQFLAGS_SUPPORT 60 bool 61 depends on PPC64 62 default y 63 64config LOCKDEP_SUPPORT 65 bool 66 default y 67 68config RWSEM_GENERIC_SPINLOCK 69 bool 70 71config RWSEM_XCHGADD_ALGORITHM 72 bool 73 default y 74 75config GENERIC_LOCKBREAK 76 bool 77 default y 78 depends on SMP && PREEMPT 79 80config ARCH_HAS_ILOG2_U32 81 bool 82 default y 83 84config ARCH_HAS_ILOG2_U64 85 bool 86 default y if 64BIT 87 88config GENERIC_HWEIGHT 89 bool 90 default y 91 92config GENERIC_CALIBRATE_DELAY 93 bool 94 default y 95 96config GENERIC_FIND_NEXT_BIT 97 bool 98 default y 99 100config GENERIC_GPIO 101 bool 102 help 103 Generic GPIO API support 104 105config ARCH_NO_VIRT_TO_BUS 106 def_bool PPC64 107 108config PPC 109 bool 110 default y 111 select HAVE_DYNAMIC_FTRACE 112 select HAVE_FTRACE 113 select ARCH_WANT_OPTIONAL_GPIOLIB 114 select HAVE_IDE 115 select HAVE_IOREMAP_PROT 116 select HAVE_EFFICIENT_UNALIGNED_ACCESS 117 select HAVE_KPROBES 118 select HAVE_ARCH_KGDB 119 select HAVE_KRETPROBES 120 select HAVE_ARCH_TRACEHOOK 121 select HAVE_LMB 122 select HAVE_DMA_ATTRS if PPC64 123 select USE_GENERIC_SMP_HELPERS if SMP 124 select HAVE_OPROFILE 125 126config EARLY_PRINTK 127 bool 128 default y 129 130config COMPAT 131 bool 132 default y if PPC64 133 select COMPAT_BINFMT_ELF 134 135config SYSVIPC_COMPAT 136 bool 137 depends on COMPAT && SYSVIPC 138 default y 139 140# All PPC32s use generic nvram driver through ppc_md 141config GENERIC_NVRAM 142 bool 143 default y if PPC32 144 145config SCHED_NO_NO_OMIT_FRAME_POINTER 146 bool 147 default y 148 149config ARCH_MAY_HAVE_PC_FDC 150 bool 151 default !PPC_PSERIES || PCI 152 153config PPC_OF 154 def_bool y 155 156config OF 157 def_bool y 158 159config PPC_UDBG_16550 160 bool 161 default n 162 163config GENERIC_TBSYNC 164 bool 165 default y if PPC32 && SMP 166 default n 167 168config AUDIT_ARCH 169 bool 170 default y 171 172config GENERIC_BUG 173 bool 174 default y 175 depends on BUG 176 177config SYS_SUPPORTS_APM_EMULATION 178 default y if PMAC_APM_EMU 179 bool 180 181config DEFAULT_UIMAGE 182 bool 183 help 184 Used to allow a board to specify it wants a uImage built by default 185 default n 186 187config REDBOOT 188 bool 189 190config HIBERNATE_32 191 bool 192 depends on (PPC_PMAC && !SMP) || BROKEN 193 default y 194 195config HIBERNATE_64 196 bool 197 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL) 198 default y 199 200config ARCH_HIBERNATION_POSSIBLE 201 bool 202 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32) 203 default y 204 205config ARCH_SUSPEND_POSSIBLE 206 def_bool y 207 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx 208 209config PPC_DCR_NATIVE 210 bool 211 default n 212 213config PPC_DCR_MMIO 214 bool 215 default n 216 217config PPC_DCR 218 bool 219 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 220 default y 221 222config PPC_OF_PLATFORM_PCI 223 bool 224 depends on PCI 225 depends on PPC64 # not supported on 32 bits yet 226 default n 227 228source "init/Kconfig" 229 230source "arch/powerpc/sysdev/Kconfig" 231source "arch/powerpc/platforms/Kconfig" 232 233menu "Kernel options" 234 235config HIGHMEM 236 bool "High memory support" 237 depends on PPC32 238 239source kernel/time/Kconfig 240source kernel/Kconfig.hz 241source kernel/Kconfig.preempt 242source "fs/Kconfig.binfmt" 243 244config HUGETLB_PAGE_SIZE_VARIABLE 245 bool 246 depends on HUGETLB_PAGE 247 default y 248 249config MATH_EMULATION 250 bool "Math emulation" 251 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500 252 ---help--- 253 Some PowerPC chips designed for embedded applications do not have 254 a floating-point unit and therefore do not implement the 255 floating-point instructions in the PowerPC instruction set. If you 256 say Y here, the kernel will include code to emulate a floating-point 257 unit, which will allow programs that use floating-point 258 instructions to run. 259 260config 8XX_MINIMAL_FPEMU 261 bool "Minimal math emulation for 8xx" 262 depends on 8xx && !MATH_EMULATION 263 help 264 Older arch/ppc kernels still emulated a few floating point 265 instructions such as load and store, even when full math 266 emulation is disabled. Say "Y" here if you want to preserve 267 this behavior. 268 269 It is recommended that you build a soft-float userspace instead. 270 271config IOMMU_VMERGE 272 bool "Enable IOMMU virtual merging" 273 depends on PPC64 274 default y 275 help 276 Cause IO segments sent to a device for DMA to be merged virtually 277 by the IOMMU when they happen to have been allocated contiguously. 278 This doesn't add pressure to the IOMMU allocator. However, some 279 drivers don't support getting large merged segments coming back 280 from *_map_sg(). 281 282 Most drivers don't have this problem; it is safe to say Y here. 283 284config IOMMU_HELPER 285 def_bool PPC64 286 287config HOTPLUG_CPU 288 bool "Support for enabling/disabling CPUs" 289 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC) 290 ---help--- 291 Say Y here to be able to disable and re-enable individual 292 CPUs at runtime on SMP machines. 293 294 Say N if you are unsure. 295 296config ARCH_ENABLE_MEMORY_HOTPLUG 297 def_bool y 298 299config ARCH_HAS_WALK_MEMORY 300 def_bool y 301 302config ARCH_ENABLE_MEMORY_HOTREMOVE 303 def_bool y 304 305config KEXEC 306 bool "kexec system call (EXPERIMENTAL)" 307 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL 308 help 309 kexec is a system call that implements the ability to shutdown your 310 current kernel, and to start another kernel. It is like a reboot 311 but it is independent of the system firmware. And like a reboot 312 you can start any kernel with it, not just Linux. 313 314 The name comes from the similarity to the exec system call. 315 316 It is an ongoing process to be certain the hardware in a machine 317 is properly shutdown, so do not be surprised if this code does not 318 initially work for you. It may help to enable device hotplugging 319 support. As of this writing the exact hardware interface is 320 strongly in flux, so no good recommendation can be made. 321 322config CRASH_DUMP 323 bool "Build a kdump crash kernel" 324 depends on PPC_MULTIPLATFORM && PPC64 325 help 326 Build a kernel suitable for use as a kdump capture kernel. 327 The kernel will be linked at a different address than normal, and 328 so can only be used for Kdump. 329 330 Don't change this unless you know what you are doing. 331 332config PHYP_DUMP 333 bool "Hypervisor-assisted dump (EXPERIMENTAL)" 334 depends on PPC_PSERIES && EXPERIMENTAL 335 help 336 Hypervisor-assisted dump is meant to be a kdump replacement 337 offering robustness and speed not possible without system 338 hypervisor assistence. 339 340 If unsure, say "N" 341 342config PPCBUG_NVRAM 343 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC 344 default y if PPC_PREP 345 346config IRQ_ALL_CPUS 347 bool "Distribute interrupts on all CPUs by default" 348 depends on SMP && !MV64360 349 help 350 This option gives the kernel permission to distribute IRQs across 351 multiple CPUs. Saying N here will route all IRQs to the first 352 CPU. Generally saying Y is safe, although some problems have been 353 reported with SMP Power Macintoshes with this option enabled. 354 355config NUMA 356 bool "NUMA support" 357 depends on PPC64 358 default y if SMP && PPC_PSERIES 359 360config NODES_SHIFT 361 int 362 default "4" 363 depends on NEED_MULTIPLE_NODES 364 365config ARCH_SELECT_MEMORY_MODEL 366 def_bool y 367 depends on PPC64 368 369config ARCH_FLATMEM_ENABLE 370 def_bool y 371 depends on (PPC64 && !NUMA) || PPC32 372 373config ARCH_SPARSEMEM_ENABLE 374 def_bool y 375 depends on PPC64 376 select SPARSEMEM_VMEMMAP_ENABLE 377 378config ARCH_SPARSEMEM_DEFAULT 379 def_bool y 380 depends on (SMP && PPC_PSERIES) || PPC_PS3 381 382config ARCH_POPULATES_NODE_MAP 383 def_bool y 384 385source "mm/Kconfig" 386 387config ARCH_MEMORY_PROBE 388 def_bool y 389 depends on MEMORY_HOTPLUG 390 391# Some NUMA nodes have memory ranges that span 392# other nodes. Even though a pfn is valid and 393# between a node's start and end pfns, it may not 394# reside on that node. See memmap_init_zone() 395# for details. 396config NODES_SPAN_OTHER_NODES 397 def_bool y 398 depends on NEED_MULTIPLE_NODES 399 400config PPC_HAS_HASH_64K 401 bool 402 depends on PPC64 403 default n 404 405config PPC_64K_PAGES 406 bool "64k page size" 407 depends on PPC64 408 select PPC_HAS_HASH_64K 409 help 410 This option changes the kernel logical page size to 64k. On machines 411 without processor support for 64k pages, the kernel will simulate 412 them by loading each individual 4k page on demand transparently, 413 while on hardware with such support, it will be used to map 414 normal application pages. 415 416config FORCE_MAX_ZONEORDER 417 int "Maximum zone order" 418 range 9 64 if PPC_64K_PAGES 419 default "9" if PPC_64K_PAGES 420 range 13 64 if PPC64 && !PPC_64K_PAGES 421 default "13" if PPC64 && !PPC_64K_PAGES 422 range 11 64 423 default "11" 424 help 425 The kernel memory allocator divides physically contiguous memory 426 blocks into "zones", where each zone is a power of two number of 427 pages. This option selects the largest power of two that the kernel 428 keeps in the memory allocator. If you need to allocate very large 429 blocks of physically contiguous memory, then you may need to 430 increase this value. 431 432 This config option is actually maximum order plus one. For example, 433 a value of 11 means that the largest free memory block is 2^10 pages. 434 435 The page size is not necessarily 4KB. For example, on 64-bit 436 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 437 this in mind when choosing a value for this option. 438 439config PPC_SUBPAGE_PROT 440 bool "Support setting protections for 4k subpages" 441 depends on PPC_64K_PAGES 442 help 443 This option adds support for a system call to allow user programs 444 to set access permissions (read/write, readonly, or no access) 445 on the 4k subpages of each 64k page. 446 447config SCHED_SMT 448 bool "SMT (Hyperthreading) scheduler support" 449 depends on PPC64 && SMP 450 help 451 SMT scheduler support improves the CPU scheduler's decision making 452 when dealing with POWER5 cpus at a cost of slightly increased 453 overhead in some places. If unsure say N here. 454 455config PROC_DEVICETREE 456 bool "Support for device tree in /proc" 457 depends on PROC_FS 458 help 459 This option adds a device-tree directory under /proc which contains 460 an image of the device tree that the kernel copies from Open 461 Firmware or other boot firmware. If unsure, say Y here. 462 463config CMDLINE_BOOL 464 bool "Default bootloader kernel arguments" 465 466config CMDLINE 467 string "Initial kernel command string" 468 depends on CMDLINE_BOOL 469 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 470 help 471 On some platforms, there is currently no way for the boot loader to 472 pass arguments to the kernel. For these platforms, you can supply 473 some command-line options at build time by entering them here. In 474 most cases you will need to specify the root device here. 475 476config EXTRA_TARGETS 477 string "Additional default image types" 478 help 479 List additional targets to be built by the bootwrapper here (separated 480 by spaces). This is useful for targets that depend of device tree 481 files in the .dts directory. 482 483 Targets in this list will be build as part of the default build 484 target, or when the user does a 'make zImage' or a 485 'make zImage.initrd'. 486 487 If unsure, leave blank 488 489if !44x || BROKEN 490config ARCH_WANTS_FREEZER_CONTROL 491 def_bool y 492 depends on ADB_PMU 493 494source kernel/power/Kconfig 495endif 496 497config SECCOMP 498 bool "Enable seccomp to safely compute untrusted bytecode" 499 depends on PROC_FS 500 default y 501 help 502 This kernel feature is useful for number crunching applications 503 that may need to compute untrusted bytecode during their 504 execution. By using pipes or other transports made available to 505 the process as file descriptors supporting the read/write 506 syscalls, it's possible to isolate those applications in 507 their own address space using seccomp. Once seccomp is 508 enabled via /proc/<pid>/seccomp, it cannot be disabled 509 and the task is only allowed to execute a few safe syscalls 510 defined by each seccomp mode. 511 512 If unsure, say Y. Only embedded should say N here. 513 514endmenu 515 516config ISA_DMA_API 517 bool 518 default !PPC_ISERIES || PCI 519 520menu "Bus options" 521 522config ISA 523 bool "Support for ISA-bus hardware" 524 depends on PPC_PREP || PPC_CHRP 525 select PPC_I8259 526 help 527 Find out whether you have ISA slots on your motherboard. ISA is the 528 name of a bus system, i.e. the way the CPU talks to the other stuff 529 inside your box. If you have an Apple machine, say N here; if you 530 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If 531 you have an embedded board, consult your board documentation. 532 533config ZONE_DMA 534 bool 535 default y 536 537config GENERIC_ISA_DMA 538 bool 539 depends on PPC64 || POWER4 || 6xx && !CPM2 540 default y 541 542config PPC_INDIRECT_PCI 543 bool 544 depends on PCI 545 default y if 40x || 44x 546 default n 547 548config EISA 549 bool 550 551config SBUS 552 bool 553 554config FSL_SOC 555 bool 556 557config FSL_PCI 558 bool 559 select PPC_INDIRECT_PCI 560 561config 4xx_SOC 562 bool 563 564config FSL_LBC 565 bool 566 help 567 Freescale Localbus support 568 569config FSL_GTM 570 bool 571 depends on PPC_83xx || QUICC_ENGINE || CPM2 572 help 573 Freescale General-purpose Timers support 574 575# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 576config MCA 577 bool 578 579# Platforms that what PCI turned unconditionally just do select PCI 580# in their config node. Platforms that want to choose at config 581# time should select PPC_PCI_CHOICE 582config PPC_PCI_CHOICE 583 bool 584 585config PCI 586 bool "PCI support" if PPC_PCI_CHOICE 587 default y if !40x && !CPM2 && !8xx && !PPC_83xx \ 588 && !PPC_85xx && !PPC_86xx 589 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx 590 default PCI_QSPAN if !4xx && !CPM2 && 8xx 591 select ARCH_SUPPORTS_MSI 592 help 593 Find out whether your system includes a PCI bus. PCI is the name of 594 a bus system, i.e. the way the CPU talks to the other stuff inside 595 your box. If you say Y here, the kernel will include drivers and 596 infrastructure code to support PCI bus devices. 597 598config PCI_DOMAINS 599 def_bool PCI 600 601config PCI_SYSCALL 602 def_bool PCI 603 604config PCI_QSPAN 605 bool "QSpan PCI" 606 depends on !4xx && !CPM2 && 8xx 607 select PPC_I8259 608 help 609 Say Y here if you have a system based on a Motorola 8xx-series 610 embedded processor with a QSPAN PCI interface, otherwise say N. 611 612config PCI_8260 613 bool 614 depends on PCI && 8260 615 select PPC_INDIRECT_PCI 616 default y 617 618config 8260_PCI9 619 bool "Enable workaround for MPC826x erratum PCI 9" 620 depends on PCI_8260 && !8272 621 default y 622 623choice 624 prompt "IDMA channel for PCI 9 workaround" 625 depends on 8260_PCI9 626 627config 8260_PCI9_IDMA1 628 bool "IDMA1" 629 630config 8260_PCI9_IDMA2 631 bool "IDMA2" 632 633config 8260_PCI9_IDMA3 634 bool "IDMA3" 635 636config 8260_PCI9_IDMA4 637 bool "IDMA4" 638 639endchoice 640 641source "drivers/pci/pcie/Kconfig" 642 643source "drivers/pci/Kconfig" 644 645source "drivers/pcmcia/Kconfig" 646 647source "drivers/pci/hotplug/Kconfig" 648 649config HAS_RAPIDIO 650 bool 651 default n 652 653config RAPIDIO 654 bool "RapidIO support" 655 depends on HAS_RAPIDIO 656 help 657 If you say Y here, the kernel will include drivers and 658 infrastructure code to support RapidIO interconnect devices. 659 660source "drivers/rapidio/Kconfig" 661 662endmenu 663 664menu "Advanced setup" 665 depends on PPC32 666 667config ADVANCED_OPTIONS 668 bool "Prompt for advanced kernel configuration options" 669 help 670 This option will enable prompting for a variety of advanced kernel 671 configuration options. These options can cause the kernel to not 672 work if they are set incorrectly, but can be used to optimize certain 673 aspects of kernel memory management. 674 675 Unless you know what you are doing, say N here. 676 677comment "Default settings for advanced configuration options are used" 678 depends on !ADVANCED_OPTIONS 679 680config LOWMEM_SIZE_BOOL 681 bool "Set maximum low memory" 682 depends on ADVANCED_OPTIONS 683 help 684 This option allows you to set the maximum amount of memory which 685 will be used as "low memory", that is, memory which the kernel can 686 access directly, without having to set up a kernel virtual mapping. 687 This can be useful in optimizing the layout of kernel virtual 688 memory. 689 690 Say N here unless you know what you are doing. 691 692config LOWMEM_SIZE 693 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 694 default "0x30000000" 695 696config RELOCATABLE 697 bool "Build a relocatable kernel (EXPERIMENTAL)" 698 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 699 help 700 This builds a kernel image that is capable of running at the 701 location the kernel is loaded at (some alignment restrictions may 702 exist). 703 704 One use is for the kexec on panic case where the recovery kernel 705 must live at a different physical address than the primary 706 kernel. 707 708 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 709 it has been loaded at and the compile time physical addresses 710 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 711 setting can still be useful to bootwrappers that need to know the 712 load location of the kernel (eg. u-boot/mkimage). 713 714config PAGE_OFFSET_BOOL 715 bool "Set custom page offset address" 716 depends on ADVANCED_OPTIONS 717 help 718 This option allows you to set the kernel virtual address at which 719 the kernel will map low memory. This can be useful in optimizing 720 the virtual memory layout of the system. 721 722 Say N here unless you know what you are doing. 723 724config PAGE_OFFSET 725 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 726 default "0xc0000000" 727 728config KERNEL_START_BOOL 729 bool "Set custom kernel base address" 730 depends on ADVANCED_OPTIONS 731 help 732 This option allows you to set the kernel virtual address at which 733 the kernel will be loaded. Normally this should match PAGE_OFFSET 734 however there are times (like kdump) that one might not want them 735 to be the same. 736 737 Say N here unless you know what you are doing. 738 739config KERNEL_START 740 hex "Virtual address of kernel base" if KERNEL_START_BOOL 741 default PAGE_OFFSET if PAGE_OFFSET_BOOL 742 default "0xc2000000" if CRASH_DUMP 743 default "0xc0000000" 744 745config PHYSICAL_START_BOOL 746 bool "Set physical address where the kernel is loaded" 747 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 748 help 749 This gives the physical address where the kernel is loaded. 750 751 Say N here unless you know what you are doing. 752 753config PHYSICAL_START 754 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 755 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP 756 default "0x00000000" 757 758config PHYSICAL_ALIGN 759 hex 760 default "0x10000000" if FSL_BOOKE 761 help 762 This value puts the alignment restrictions on physical address 763 where kernel is loaded and run from. Kernel is compiled for an 764 address which meets above alignment restriction. 765 766config TASK_SIZE_BOOL 767 bool "Set custom user task size" 768 depends on ADVANCED_OPTIONS 769 help 770 This option allows you to set the amount of virtual address space 771 allocated to user tasks. This can be useful in optimizing the 772 virtual memory layout of the system. 773 774 Say N here unless you know what you are doing. 775 776config TASK_SIZE 777 hex "Size of user task space" if TASK_SIZE_BOOL 778 default "0x80000000" if PPC_PREP || PPC_8xx 779 default "0xc0000000" 780 781config CONSISTENT_START_BOOL 782 bool "Set custom consistent memory pool address" 783 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 784 help 785 This option allows you to set the base virtual address 786 of the consistent memory pool. This pool of virtual 787 memory is used to make consistent memory allocations. 788 789config CONSISTENT_START 790 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL 791 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx) 792 default "0xff100000" if NOT_COHERENT_CACHE 793 794config CONSISTENT_SIZE_BOOL 795 bool "Set custom consistent memory pool size" 796 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 797 help 798 This option allows you to set the size of the 799 consistent memory pool. This pool of virtual memory 800 is used to make consistent memory allocations. 801 802config CONSISTENT_SIZE 803 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 804 default "0x00200000" if NOT_COHERENT_CACHE 805 806config PIN_TLB 807 bool "Pinned Kernel TLBs (860 ONLY)" 808 depends on ADVANCED_OPTIONS && 8xx 809endmenu 810 811if PPC64 812config RELOCATABLE 813 bool "Build a relocatable kernel" 814 help 815 This builds a kernel image that is capable of running anywhere 816 in the RMA (real memory area) at any 16k-aligned base address. 817 The kernel is linked as a position-independent executable (PIE) 818 and contains dynamic relocations which are processed early 819 in the bootup process. 820 821 One use is for the kexec on panic case where the recovery kernel 822 must live at a different physical address than the primary 823 kernel. 824 825config PAGE_OFFSET 826 hex 827 default "0xc000000000000000" 828config KERNEL_START 829 hex 830 default "0xc000000002000000" if CRASH_DUMP 831 default "0xc000000000000000" 832config PHYSICAL_START 833 hex 834 default "0x02000000" if CRASH_DUMP 835 default "0x00000000" 836endif 837 838source "net/Kconfig" 839 840source "drivers/Kconfig" 841 842source "fs/Kconfig" 843 844# XXX source "arch/ppc/8xx_io/Kconfig" 845 846# XXX source "arch/ppc/8260_io/Kconfig" 847 848source "arch/powerpc/sysdev/qe_lib/Kconfig" 849 850source "lib/Kconfig" 851 852source "arch/powerpc/Kconfig.debug" 853 854source "security/Kconfig" 855 856config KEYS_COMPAT 857 bool 858 depends on COMPAT && KEYS 859 default y 860 861source "crypto/Kconfig" 862 863config PPC_CLOCK 864 bool 865 default n 866 select HAVE_CLK 867 868config PPC_LIB_RHEAP 869 bool 870 871source "arch/powerpc/kvm/Kconfig" 872