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kernel / arch / powerpc / Kconfig
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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 ARCH_PHYS_ADDR_T_64BIT 23 def_bool PPC64 || PHYS_64BIT 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 GENERIC_HARDIRQS_NO__DO_IRQ 46 bool 47 default y 48 49config HAVE_SETUP_PER_CPU_AREA 50 def_bool PPC64 51 52config NEED_PER_CPU_EMBED_FIRST_CHUNK 53 def_bool PPC64 54 55config IRQ_PER_CPU 56 bool 57 default y 58 59config STACKTRACE_SUPPORT 60 bool 61 default y 62 63config HAVE_LATENCYTOP_SUPPORT 64 def_bool y 65 66config TRACE_IRQFLAGS_SUPPORT 67 bool 68 default y 69 70config LOCKDEP_SUPPORT 71 bool 72 default y 73 74config RWSEM_GENERIC_SPINLOCK 75 bool 76 77config RWSEM_XCHGADD_ALGORITHM 78 bool 79 default y 80 81config GENERIC_LOCKBREAK 82 bool 83 default y 84 depends on SMP && PREEMPT 85 86config ARCH_HAS_ILOG2_U32 87 bool 88 default y 89 90config ARCH_HAS_ILOG2_U64 91 bool 92 default y if 64BIT 93 94config GENERIC_HWEIGHT 95 bool 96 default y 97 98config GENERIC_FIND_NEXT_BIT 99 bool 100 default y 101 102config GENERIC_GPIO 103 bool 104 help 105 Generic GPIO API support 106 107config ARCH_NO_VIRT_TO_BUS 108 def_bool PPC64 109 110config PPC 111 bool 112 default y 113 select HAVE_FTRACE_MCOUNT_RECORD 114 select HAVE_DYNAMIC_FTRACE 115 select HAVE_FUNCTION_TRACER 116 select HAVE_FUNCTION_GRAPH_TRACER 117 select ARCH_WANT_OPTIONAL_GPIOLIB 118 select HAVE_IDE 119 select HAVE_IOREMAP_PROT 120 select HAVE_EFFICIENT_UNALIGNED_ACCESS 121 select HAVE_KPROBES 122 select HAVE_ARCH_KGDB 123 select HAVE_KRETPROBES 124 select HAVE_ARCH_TRACEHOOK 125 select HAVE_LMB 126 select HAVE_DMA_ATTRS 127 select HAVE_DMA_API_DEBUG 128 select USE_GENERIC_SMP_HELPERS if SMP 129 select HAVE_OPROFILE 130 select HAVE_SYSCALL_WRAPPERS if PPC64 131 select GENERIC_ATOMIC64 if PPC32 132 select HAVE_PERF_EVENTS 133 134config EARLY_PRINTK 135 bool 136 default y 137 138config COMPAT 139 bool 140 default y if PPC64 141 select COMPAT_BINFMT_ELF 142 143config SYSVIPC_COMPAT 144 bool 145 depends on COMPAT && SYSVIPC 146 default y 147 148# All PPC32s use generic nvram driver through ppc_md 149config GENERIC_NVRAM 150 bool 151 default y if PPC32 152 153config SCHED_OMIT_FRAME_POINTER 154 bool 155 default y 156 157config ARCH_MAY_HAVE_PC_FDC 158 bool 159 default !PPC_PSERIES || PCI 160 161config PPC_OF 162 def_bool y 163 164config OF 165 def_bool y 166 167config PPC_UDBG_16550 168 bool 169 default n 170 171config GENERIC_TBSYNC 172 bool 173 default y if PPC32 && SMP 174 default n 175 176config AUDIT_ARCH 177 bool 178 default y 179 180config GENERIC_BUG 181 bool 182 default y 183 depends on BUG 184 185config SYS_SUPPORTS_APM_EMULATION 186 default y if PMAC_APM_EMU 187 bool 188 189config DTC 190 bool 191 default y 192 193config DEFAULT_UIMAGE 194 bool 195 help 196 Used to allow a board to specify it wants a uImage built by default 197 default n 198 199config REDBOOT 200 bool 201 202config HIBERNATE_32 203 bool 204 depends on (PPC_PMAC && !SMP) || BROKEN 205 default y 206 207config HIBERNATE_64 208 bool 209 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL) 210 default y 211 212config ARCH_HIBERNATION_POSSIBLE 213 bool 214 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32) 215 default y 216 217config ARCH_SUSPEND_POSSIBLE 218 def_bool y 219 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx 220 221config PPC_DCR_NATIVE 222 bool 223 default n 224 225config PPC_DCR_MMIO 226 bool 227 default n 228 229config PPC_DCR 230 bool 231 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 232 default y 233 234config PPC_OF_PLATFORM_PCI 235 bool 236 depends on PCI 237 depends on PPC64 # not supported on 32 bits yet 238 default n 239 240config ARCH_SUPPORTS_DEBUG_PAGEALLOC 241 def_bool y 242 243source "init/Kconfig" 244 245source "kernel/Kconfig.freezer" 246 247source "arch/powerpc/sysdev/Kconfig" 248source "arch/powerpc/platforms/Kconfig" 249 250menu "Kernel options" 251 252config HIGHMEM 253 bool "High memory support" 254 depends on PPC32 255 256source kernel/time/Kconfig 257source kernel/Kconfig.hz 258source kernel/Kconfig.preempt 259source "fs/Kconfig.binfmt" 260 261config HUGETLB_PAGE_SIZE_VARIABLE 262 bool 263 depends on HUGETLB_PAGE 264 default y 265 266config MATH_EMULATION 267 bool "Math emulation" 268 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500 269 ---help--- 270 Some PowerPC chips designed for embedded applications do not have 271 a floating-point unit and therefore do not implement the 272 floating-point instructions in the PowerPC instruction set. If you 273 say Y here, the kernel will include code to emulate a floating-point 274 unit, which will allow programs that use floating-point 275 instructions to run. 276 277config 8XX_MINIMAL_FPEMU 278 bool "Minimal math emulation for 8xx" 279 depends on 8xx && !MATH_EMULATION 280 help 281 Older arch/ppc kernels still emulated a few floating point 282 instructions such as load and store, even when full math 283 emulation is disabled. Say "Y" here if you want to preserve 284 this behavior. 285 286 It is recommended that you build a soft-float userspace instead. 287 288config IOMMU_VMERGE 289 bool "Enable IOMMU virtual merging" 290 depends on PPC64 291 default y 292 help 293 Cause IO segments sent to a device for DMA to be merged virtually 294 by the IOMMU when they happen to have been allocated contiguously. 295 This doesn't add pressure to the IOMMU allocator. However, some 296 drivers don't support getting large merged segments coming back 297 from *_map_sg(). 298 299 Most drivers don't have this problem; it is safe to say Y here. 300 301config IOMMU_HELPER 302 def_bool PPC64 303 304config SWIOTLB 305 bool "SWIOTLB support" 306 default n 307 select IOMMU_HELPER 308 ---help--- 309 Support for IO bounce buffering for systems without an IOMMU. 310 This allows us to DMA to the full physical address space on 311 platforms where the size of a physical address is larger 312 than the bus address. Not all platforms support this. 313 314config 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 323config ARCH_ENABLE_MEMORY_HOTPLUG 324 def_bool y 325 326config ARCH_HAS_WALK_MEMORY 327 def_bool y 328 329config ARCH_ENABLE_MEMORY_HOTREMOVE 330 def_bool y 331 332config 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 349config 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 358config 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 368config PPCBUG_NVRAM 369 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC 370 default y if PPC_PREP 371 372config 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 381config NUMA 382 bool "NUMA support" 383 depends on PPC64 384 default y if SMP && PPC_PSERIES 385 386config NODES_SHIFT 387 int 388 default "8" if PPC64 389 default "4" 390 depends on NEED_MULTIPLE_NODES 391 392config MAX_ACTIVE_REGIONS 393 int 394 default "256" if PPC64 395 default "32" 396 397config ARCH_SELECT_MEMORY_MODEL 398 def_bool y 399 depends on PPC64 400 401config ARCH_FLATMEM_ENABLE 402 def_bool y 403 depends on (PPC64 && !NUMA) || PPC32 404 405config ARCH_SPARSEMEM_ENABLE 406 def_bool y 407 depends on PPC64 408 select SPARSEMEM_VMEMMAP_ENABLE 409 410config ARCH_SPARSEMEM_DEFAULT 411 def_bool y 412 depends on (SMP && PPC_PSERIES) || PPC_PS3 413 414config ARCH_POPULATES_NODE_MAP 415 def_bool y 416 417source "mm/Kconfig" 418 419config ARCH_MEMORY_PROBE 420 def_bool y 421 depends on MEMORY_HOTPLUG 422 423# Some NUMA nodes have memory ranges that span 424# other nodes. Even though a pfn is valid and 425# between a node's start and end pfns, it may not 426# reside on that node. See memmap_init_zone() 427# for details. 428config NODES_SPAN_OTHER_NODES 429 def_bool y 430 depends on NEED_MULTIPLE_NODES 431 432config PPC_HAS_HASH_64K 433 bool 434 depends on PPC64 435 default n 436 437config STDBINUTILS 438 bool "Using standard binutils settings" 439 depends on 44x 440 default y 441 help 442 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 443 Note, that kernel will be able to run only those applications, 444 which had been compiled using binutils later than 2.17.50.0.3 with 445 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 446 the older binutils, you can patch them with a trivial patch, which 447 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 448 449choice 450 prompt "Page size" 451 default PPC_4K_PAGES 452 help 453 Select the kernel logical page size. Increasing the page size 454 will reduce software overhead at each page boundary, allow 455 hardware prefetch mechanisms to be more effective, and allow 456 larger dma transfers increasing IO efficiency and reducing 457 overhead. However the utilization of memory will increase. 458 For example, each cached file will using a multiple of the 459 page size to hold its contents and the difference between the 460 end of file and the end of page is wasted. 461 462 Some dedicated systems, such as software raid serving with 463 accelerated calculations, have shown significant increases. 464 465 If you configure a 64 bit kernel for 64k pages but the 466 processor does not support them, then the kernel will simulate 467 them with 4k pages, loading them on demand, but with the 468 reduced software overhead and larger internal fragmentation. 469 For the 32 bit kernel, a large page option will not be offered 470 unless it is supported by the configured processor. 471 472 If unsure, choose 4K_PAGES. 473 474config PPC_4K_PAGES 475 bool "4k page size" 476 477config PPC_16K_PAGES 478 bool "16k page size" if 44x 479 480config PPC_64K_PAGES 481 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64 482 select PPC_HAS_HASH_64K if PPC_STD_MMU_64 483 484config PPC_256K_PAGES 485 bool "256k page size" if 44x 486 depends on !STDBINUTILS 487 help 488 Make the page size 256k. 489 490 As the ELF standard only requires alignment to support page 491 sizes up to 64k, you will need to compile all of your user 492 space applications with a non-standard binutils settings 493 (see the STDBINUTILS description for details). 494 495 Say N unless you know what you are doing. 496 497endchoice 498 499config FORCE_MAX_ZONEORDER 500 int "Maximum zone order" 501 range 9 64 if PPC64 && PPC_64K_PAGES 502 default "9" if PPC64 && PPC_64K_PAGES 503 range 13 64 if PPC64 && !PPC_64K_PAGES 504 default "13" if PPC64 && !PPC_64K_PAGES 505 range 9 64 if PPC32 && PPC_16K_PAGES 506 default "9" if PPC32 && PPC_16K_PAGES 507 range 7 64 if PPC32 && PPC_64K_PAGES 508 default "7" if PPC32 && PPC_64K_PAGES 509 range 5 64 if PPC32 && PPC_256K_PAGES 510 default "5" if PPC32 && PPC_256K_PAGES 511 range 11 64 512 default "11" 513 help 514 The kernel memory allocator divides physically contiguous memory 515 blocks into "zones", where each zone is a power of two number of 516 pages. This option selects the largest power of two that the kernel 517 keeps in the memory allocator. If you need to allocate very large 518 blocks of physically contiguous memory, then you may need to 519 increase this value. 520 521 This config option is actually maximum order plus one. For example, 522 a value of 11 means that the largest free memory block is 2^10 pages. 523 524 The page size is not necessarily 4KB. For example, on 64-bit 525 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 526 this in mind when choosing a value for this option. 527 528config PPC_SUBPAGE_PROT 529 bool "Support setting protections for 4k subpages" 530 depends on PPC_STD_MMU_64 && PPC_64K_PAGES 531 help 532 This option adds support for a system call to allow user programs 533 to set access permissions (read/write, readonly, or no access) 534 on the 4k subpages of each 64k page. 535 536config SCHED_SMT 537 bool "SMT (Hyperthreading) scheduler support" 538 depends on PPC64 && SMP 539 help 540 SMT scheduler support improves the CPU scheduler's decision making 541 when dealing with POWER5 cpus at a cost of slightly increased 542 overhead in some places. If unsure say N here. 543 544config PROC_DEVICETREE 545 bool "Support for device tree in /proc" 546 depends on PROC_FS 547 help 548 This option adds a device-tree directory under /proc which contains 549 an image of the device tree that the kernel copies from Open 550 Firmware or other boot firmware. If unsure, say Y here. 551 552config CMDLINE_BOOL 553 bool "Default bootloader kernel arguments" 554 555config CMDLINE 556 string "Initial kernel command string" 557 depends on CMDLINE_BOOL 558 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 559 help 560 On some platforms, there is currently no way for the boot loader to 561 pass arguments to the kernel. For these platforms, you can supply 562 some command-line options at build time by entering them here. In 563 most cases you will need to specify the root device here. 564 565config EXTRA_TARGETS 566 string "Additional default image types" 567 help 568 List additional targets to be built by the bootwrapper here (separated 569 by spaces). This is useful for targets that depend of device tree 570 files in the .dts directory. 571 572 Targets in this list will be build as part of the default build 573 target, or when the user does a 'make zImage' or a 574 'make zImage.initrd'. 575 576 If unsure, leave blank 577 578if !44x || BROKEN 579config ARCH_WANTS_FREEZER_CONTROL 580 def_bool y 581 depends on ADB_PMU 582 583source kernel/power/Kconfig 584endif 585 586config SECCOMP 587 bool "Enable seccomp to safely compute untrusted bytecode" 588 depends on PROC_FS 589 default y 590 help 591 This kernel feature is useful for number crunching applications 592 that may need to compute untrusted bytecode during their 593 execution. By using pipes or other transports made available to 594 the process as file descriptors supporting the read/write 595 syscalls, it's possible to isolate those applications in 596 their own address space using seccomp. Once seccomp is 597 enabled via /proc/<pid>/seccomp, it cannot be disabled 598 and the task is only allowed to execute a few safe syscalls 599 defined by each seccomp mode. 600 601 If unsure, say Y. Only embedded should say N here. 602 603endmenu 604 605config ISA_DMA_API 606 bool 607 default !PPC_ISERIES || PCI 608 609menu "Bus options" 610 611config ISA 612 bool "Support for ISA-bus hardware" 613 depends on PPC_PREP || PPC_CHRP 614 select PPC_I8259 615 help 616 Find out whether you have ISA slots on your motherboard. ISA is the 617 name of a bus system, i.e. the way the CPU talks to the other stuff 618 inside your box. If you have an Apple machine, say N here; if you 619 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If 620 you have an embedded board, consult your board documentation. 621 622config ZONE_DMA 623 bool 624 default y 625 626config GENERIC_ISA_DMA 627 bool 628 depends on PPC64 || POWER4 || 6xx && !CPM2 629 default y 630 631config PPC_INDIRECT_PCI 632 bool 633 depends on PCI 634 default y if 40x || 44x 635 default n 636 637config EISA 638 bool 639 640config SBUS 641 bool 642 643config FSL_SOC 644 bool 645 646config FSL_PCI 647 bool 648 select PPC_INDIRECT_PCI 649 select PCI_QUIRKS 650 651config 4xx_SOC 652 bool 653 654config FSL_LBC 655 bool 656 help 657 Freescale Localbus support 658 659config FSL_GTM 660 bool 661 depends on PPC_83xx || QUICC_ENGINE || CPM2 662 help 663 Freescale General-purpose Timers support 664 665# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 666config MCA 667 bool 668 669# Platforms that what PCI turned unconditionally just do select PCI 670# in their config node. Platforms that want to choose at config 671# time should select PPC_PCI_CHOICE 672config PPC_PCI_CHOICE 673 bool 674 675config PCI 676 bool "PCI support" if PPC_PCI_CHOICE 677 default y if !40x && !CPM2 && !8xx && !PPC_83xx \ 678 && !PPC_85xx && !PPC_86xx 679 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx 680 default PCI_QSPAN if !4xx && !CPM2 && 8xx 681 select ARCH_SUPPORTS_MSI 682 help 683 Find out whether your system includes a PCI bus. PCI is the name of 684 a bus system, i.e. the way the CPU talks to the other stuff inside 685 your box. If you say Y here, the kernel will include drivers and 686 infrastructure code to support PCI bus devices. 687 688config PCI_DOMAINS 689 def_bool PCI 690 691config PCI_SYSCALL 692 def_bool PCI 693 694config PCI_QSPAN 695 bool "QSpan PCI" 696 depends on !4xx && !CPM2 && 8xx 697 select PPC_I8259 698 help 699 Say Y here if you have a system based on a Motorola 8xx-series 700 embedded processor with a QSPAN PCI interface, otherwise say N. 701 702config PCI_8260 703 bool 704 depends on PCI && 8260 705 select PPC_INDIRECT_PCI 706 default y 707 708config 8260_PCI9 709 bool "Enable workaround for MPC826x erratum PCI 9" 710 depends on PCI_8260 && !8272 711 default y 712 713choice 714 prompt "IDMA channel for PCI 9 workaround" 715 depends on 8260_PCI9 716 717config 8260_PCI9_IDMA1 718 bool "IDMA1" 719 720config 8260_PCI9_IDMA2 721 bool "IDMA2" 722 723config 8260_PCI9_IDMA3 724 bool "IDMA3" 725 726config 8260_PCI9_IDMA4 727 bool "IDMA4" 728 729endchoice 730 731source "drivers/pci/pcie/Kconfig" 732 733source "drivers/pci/Kconfig" 734 735source "drivers/pcmcia/Kconfig" 736 737source "drivers/pci/hotplug/Kconfig" 738 739config HAS_RAPIDIO 740 bool 741 default n 742 743config RAPIDIO 744 bool "RapidIO support" 745 depends on HAS_RAPIDIO 746 help 747 If you say Y here, the kernel will include drivers and 748 infrastructure code to support RapidIO interconnect devices. 749 750source "drivers/rapidio/Kconfig" 751 752endmenu 753 754menu "Advanced setup" 755 depends on PPC32 756 757config ADVANCED_OPTIONS 758 bool "Prompt for advanced kernel configuration options" 759 help 760 This option will enable prompting for a variety of advanced kernel 761 configuration options. These options can cause the kernel to not 762 work if they are set incorrectly, but can be used to optimize certain 763 aspects of kernel memory management. 764 765 Unless you know what you are doing, say N here. 766 767comment "Default settings for advanced configuration options are used" 768 depends on !ADVANCED_OPTIONS 769 770config LOWMEM_SIZE_BOOL 771 bool "Set maximum low memory" 772 depends on ADVANCED_OPTIONS 773 help 774 This option allows you to set the maximum amount of memory which 775 will be used as "low memory", that is, memory which the kernel can 776 access directly, without having to set up a kernel virtual mapping. 777 This can be useful in optimizing the layout of kernel virtual 778 memory. 779 780 Say N here unless you know what you are doing. 781 782config LOWMEM_SIZE 783 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 784 default "0x30000000" 785 786config LOWMEM_CAM_NUM_BOOL 787 bool "Set number of CAMs to use to map low memory" 788 depends on ADVANCED_OPTIONS && FSL_BOOKE 789 help 790 This option allows you to set the maximum number of CAM slots that 791 will be used to map low memory. There are a limited number of slots 792 available and even more limited number that will fit in the L1 MMU. 793 However, using more entries will allow mapping more low memory. This 794 can be useful in optimizing the layout of kernel virtual memory. 795 796 Say N here unless you know what you are doing. 797 798config LOWMEM_CAM_NUM 799 depends on FSL_BOOKE 800 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 801 default 3 802 803config RELOCATABLE 804 bool "Build a relocatable kernel (EXPERIMENTAL)" 805 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 806 help 807 This builds a kernel image that is capable of running at the 808 location the kernel is loaded at (some alignment restrictions may 809 exist). 810 811 One use is for the kexec on panic case where the recovery kernel 812 must live at a different physical address than the primary 813 kernel. 814 815 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 816 it has been loaded at and the compile time physical addresses 817 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 818 setting can still be useful to bootwrappers that need to know the 819 load location of the kernel (eg. u-boot/mkimage). 820 821config PAGE_OFFSET_BOOL 822 bool "Set custom page offset address" 823 depends on ADVANCED_OPTIONS 824 help 825 This option allows you to set the kernel virtual address at which 826 the kernel will map low memory. This can be useful in optimizing 827 the virtual memory layout of the system. 828 829 Say N here unless you know what you are doing. 830 831config PAGE_OFFSET 832 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 833 default "0xc0000000" 834 835config KERNEL_START_BOOL 836 bool "Set custom kernel base address" 837 depends on ADVANCED_OPTIONS 838 help 839 This option allows you to set the kernel virtual address at which 840 the kernel will be loaded. Normally this should match PAGE_OFFSET 841 however there are times (like kdump) that one might not want them 842 to be the same. 843 844 Say N here unless you know what you are doing. 845 846config KERNEL_START 847 hex "Virtual address of kernel base" if KERNEL_START_BOOL 848 default PAGE_OFFSET if PAGE_OFFSET_BOOL 849 default "0xc2000000" if CRASH_DUMP 850 default "0xc0000000" 851 852config PHYSICAL_START_BOOL 853 bool "Set physical address where the kernel is loaded" 854 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 855 help 856 This gives the physical address where the kernel is loaded. 857 858 Say N here unless you know what you are doing. 859 860config PHYSICAL_START 861 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 862 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP 863 default "0x00000000" 864 865config PHYSICAL_ALIGN 866 hex 867 default "0x04000000" if FSL_BOOKE 868 help 869 This value puts the alignment restrictions on physical address 870 where kernel is loaded and run from. Kernel is compiled for an 871 address which meets above alignment restriction. 872 873config TASK_SIZE_BOOL 874 bool "Set custom user task size" 875 depends on ADVANCED_OPTIONS 876 help 877 This option allows you to set the amount of virtual address space 878 allocated to user tasks. This can be useful in optimizing the 879 virtual memory layout of the system. 880 881 Say N here unless you know what you are doing. 882 883config TASK_SIZE 884 hex "Size of user task space" if TASK_SIZE_BOOL 885 default "0x80000000" if PPC_PREP || PPC_8xx 886 default "0xc0000000" 887 888config CONSISTENT_SIZE_BOOL 889 bool "Set custom consistent memory pool size" 890 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 891 help 892 This option allows you to set the size of the 893 consistent memory pool. This pool of virtual memory 894 is used to make consistent memory allocations. 895 896config CONSISTENT_SIZE 897 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 898 default "0x00200000" if NOT_COHERENT_CACHE 899 900config PIN_TLB 901 bool "Pinned Kernel TLBs (860 ONLY)" 902 depends on ADVANCED_OPTIONS && 8xx 903endmenu 904 905if PPC64 906config RELOCATABLE 907 bool "Build a relocatable kernel" 908 help 909 This builds a kernel image that is capable of running anywhere 910 in the RMA (real memory area) at any 16k-aligned base address. 911 The kernel is linked as a position-independent executable (PIE) 912 and contains dynamic relocations which are processed early 913 in the bootup process. 914 915 One use is for the kexec on panic case where the recovery kernel 916 must live at a different physical address than the primary 917 kernel. 918 919config PAGE_OFFSET 920 hex 921 default "0xc000000000000000" 922config KERNEL_START 923 hex 924 default "0xc000000000000000" 925config PHYSICAL_START 926 hex 927 default "0x00000000" 928endif 929 930source "net/Kconfig" 931 932source "drivers/Kconfig" 933 934source "fs/Kconfig" 935 936source "arch/powerpc/sysdev/qe_lib/Kconfig" 937 938source "lib/Kconfig" 939 940source "arch/powerpc/Kconfig.debug" 941 942source "security/Kconfig" 943 944config KEYS_COMPAT 945 bool 946 depends on COMPAT && KEYS 947 default y 948 949source "crypto/Kconfig" 950 951config PPC_CLOCK 952 bool 953 default n 954 select HAVE_CLK 955 956config PPC_LIB_RHEAP 957 bool 958 959source "arch/powerpc/kvm/Kconfig"