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 417config SYS_SUPPORTS_HUGETLBFS 418 def_bool y 419 depends on PPC_BOOK3S_64 420 421source "mm/Kconfig" 422 423config ARCH_MEMORY_PROBE 424 def_bool y 425 depends on MEMORY_HOTPLUG 426 427# Some NUMA nodes have memory ranges that span 428# other nodes. Even though a pfn is valid and 429# between a node's start and end pfns, it may not 430# reside on that node. See memmap_init_zone() 431# for details. 432config NODES_SPAN_OTHER_NODES 433 def_bool y 434 depends on NEED_MULTIPLE_NODES 435 436config PPC_HAS_HASH_64K 437 bool 438 depends on PPC64 439 default n 440 441config STDBINUTILS 442 bool "Using standard binutils settings" 443 depends on 44x 444 default y 445 help 446 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 447 Note, that kernel will be able to run only those applications, 448 which had been compiled using binutils later than 2.17.50.0.3 with 449 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 450 the older binutils, you can patch them with a trivial patch, which 451 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 452 453choice 454 prompt "Page size" 455 default PPC_4K_PAGES 456 help 457 Select the kernel logical page size. Increasing the page size 458 will reduce software overhead at each page boundary, allow 459 hardware prefetch mechanisms to be more effective, and allow 460 larger dma transfers increasing IO efficiency and reducing 461 overhead. However the utilization of memory will increase. 462 For example, each cached file will using a multiple of the 463 page size to hold its contents and the difference between the 464 end of file and the end of page is wasted. 465 466 Some dedicated systems, such as software raid serving with 467 accelerated calculations, have shown significant increases. 468 469 If you configure a 64 bit kernel for 64k pages but the 470 processor does not support them, then the kernel will simulate 471 them with 4k pages, loading them on demand, but with the 472 reduced software overhead and larger internal fragmentation. 473 For the 32 bit kernel, a large page option will not be offered 474 unless it is supported by the configured processor. 475 476 If unsure, choose 4K_PAGES. 477 478config PPC_4K_PAGES 479 bool "4k page size" 480 481config PPC_16K_PAGES 482 bool "16k page size" if 44x 483 484config PPC_64K_PAGES 485 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64 486 select PPC_HAS_HASH_64K if PPC_STD_MMU_64 487 488config PPC_256K_PAGES 489 bool "256k page size" if 44x 490 depends on !STDBINUTILS 491 help 492 Make the page size 256k. 493 494 As the ELF standard only requires alignment to support page 495 sizes up to 64k, you will need to compile all of your user 496 space applications with a non-standard binutils settings 497 (see the STDBINUTILS description for details). 498 499 Say N unless you know what you are doing. 500 501endchoice 502 503config FORCE_MAX_ZONEORDER 504 int "Maximum zone order" 505 range 9 64 if PPC64 && PPC_64K_PAGES 506 default "9" if PPC64 && PPC_64K_PAGES 507 range 13 64 if PPC64 && !PPC_64K_PAGES 508 default "13" if PPC64 && !PPC_64K_PAGES 509 range 9 64 if PPC32 && PPC_16K_PAGES 510 default "9" if PPC32 && PPC_16K_PAGES 511 range 7 64 if PPC32 && PPC_64K_PAGES 512 default "7" if PPC32 && PPC_64K_PAGES 513 range 5 64 if PPC32 && PPC_256K_PAGES 514 default "5" if PPC32 && PPC_256K_PAGES 515 range 11 64 516 default "11" 517 help 518 The kernel memory allocator divides physically contiguous memory 519 blocks into "zones", where each zone is a power of two number of 520 pages. This option selects the largest power of two that the kernel 521 keeps in the memory allocator. If you need to allocate very large 522 blocks of physically contiguous memory, then you may need to 523 increase this value. 524 525 This config option is actually maximum order plus one. For example, 526 a value of 11 means that the largest free memory block is 2^10 pages. 527 528 The page size is not necessarily 4KB. For example, on 64-bit 529 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 530 this in mind when choosing a value for this option. 531 532config PPC_SUBPAGE_PROT 533 bool "Support setting protections for 4k subpages" 534 depends on PPC_STD_MMU_64 && PPC_64K_PAGES 535 help 536 This option adds support for a system call to allow user programs 537 to set access permissions (read/write, readonly, or no access) 538 on the 4k subpages of each 64k page. 539 540config SCHED_SMT 541 bool "SMT (Hyperthreading) scheduler support" 542 depends on PPC64 && SMP 543 help 544 SMT scheduler support improves the CPU scheduler's decision making 545 when dealing with POWER5 cpus at a cost of slightly increased 546 overhead in some places. If unsure say N here. 547 548config PROC_DEVICETREE 549 bool "Support for device tree in /proc" 550 depends on PROC_FS 551 help 552 This option adds a device-tree directory under /proc which contains 553 an image of the device tree that the kernel copies from Open 554 Firmware or other boot firmware. If unsure, say Y here. 555 556config CMDLINE_BOOL 557 bool "Default bootloader kernel arguments" 558 559config CMDLINE 560 string "Initial kernel command string" 561 depends on CMDLINE_BOOL 562 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 563 help 564 On some platforms, there is currently no way for the boot loader to 565 pass arguments to the kernel. For these platforms, you can supply 566 some command-line options at build time by entering them here. In 567 most cases you will need to specify the root device here. 568 569config EXTRA_TARGETS 570 string "Additional default image types" 571 help 572 List additional targets to be built by the bootwrapper here (separated 573 by spaces). This is useful for targets that depend of device tree 574 files in the .dts directory. 575 576 Targets in this list will be build as part of the default build 577 target, or when the user does a 'make zImage' or a 578 'make zImage.initrd'. 579 580 If unsure, leave blank 581 582if !44x || BROKEN 583config ARCH_WANTS_FREEZER_CONTROL 584 def_bool y 585 depends on ADB_PMU 586 587source kernel/power/Kconfig 588endif 589 590config SECCOMP 591 bool "Enable seccomp to safely compute untrusted bytecode" 592 depends on PROC_FS 593 default y 594 help 595 This kernel feature is useful for number crunching applications 596 that may need to compute untrusted bytecode during their 597 execution. By using pipes or other transports made available to 598 the process as file descriptors supporting the read/write 599 syscalls, it's possible to isolate those applications in 600 their own address space using seccomp. Once seccomp is 601 enabled via /proc/<pid>/seccomp, it cannot be disabled 602 and the task is only allowed to execute a few safe syscalls 603 defined by each seccomp mode. 604 605 If unsure, say Y. Only embedded should say N here. 606 607endmenu 608 609config ISA_DMA_API 610 bool 611 default !PPC_ISERIES || PCI 612 613menu "Bus options" 614 615config ISA 616 bool "Support for ISA-bus hardware" 617 depends on PPC_PREP || PPC_CHRP 618 select PPC_I8259 619 help 620 Find out whether you have ISA slots on your motherboard. ISA is the 621 name of a bus system, i.e. the way the CPU talks to the other stuff 622 inside your box. If you have an Apple machine, say N here; if you 623 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If 624 you have an embedded board, consult your board documentation. 625 626config ZONE_DMA 627 bool 628 default y 629 630config GENERIC_ISA_DMA 631 bool 632 depends on PPC64 || POWER4 || 6xx && !CPM2 633 default y 634 635config PPC_INDIRECT_PCI 636 bool 637 depends on PCI 638 default y if 40x || 44x 639 default n 640 641config EISA 642 bool 643 644config SBUS 645 bool 646 647config FSL_SOC 648 bool 649 650config FSL_PCI 651 bool 652 select PPC_INDIRECT_PCI 653 select PCI_QUIRKS 654 655config 4xx_SOC 656 bool 657 658config FSL_LBC 659 bool 660 help 661 Freescale Localbus support 662 663config FSL_GTM 664 bool 665 depends on PPC_83xx || QUICC_ENGINE || CPM2 666 help 667 Freescale General-purpose Timers support 668 669# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 670config MCA 671 bool 672 673# Platforms that what PCI turned unconditionally just do select PCI 674# in their config node. Platforms that want to choose at config 675# time should select PPC_PCI_CHOICE 676config PPC_PCI_CHOICE 677 bool 678 679config PCI 680 bool "PCI support" if PPC_PCI_CHOICE 681 default y if !40x && !CPM2 && !8xx && !PPC_83xx \ 682 && !PPC_85xx && !PPC_86xx 683 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx 684 default PCI_QSPAN if !4xx && !CPM2 && 8xx 685 select ARCH_SUPPORTS_MSI 686 help 687 Find out whether your system includes a PCI bus. PCI is the name of 688 a bus system, i.e. the way the CPU talks to the other stuff inside 689 your box. If you say Y here, the kernel will include drivers and 690 infrastructure code to support PCI bus devices. 691 692config PCI_DOMAINS 693 def_bool PCI 694 695config PCI_SYSCALL 696 def_bool PCI 697 698config PCI_QSPAN 699 bool "QSpan PCI" 700 depends on !4xx && !CPM2 && 8xx 701 select PPC_I8259 702 help 703 Say Y here if you have a system based on a Motorola 8xx-series 704 embedded processor with a QSPAN PCI interface, otherwise say N. 705 706config PCI_8260 707 bool 708 depends on PCI && 8260 709 select PPC_INDIRECT_PCI 710 default y 711 712config 8260_PCI9 713 bool "Enable workaround for MPC826x erratum PCI 9" 714 depends on PCI_8260 && !8272 715 default y 716 717choice 718 prompt "IDMA channel for PCI 9 workaround" 719 depends on 8260_PCI9 720 721config 8260_PCI9_IDMA1 722 bool "IDMA1" 723 724config 8260_PCI9_IDMA2 725 bool "IDMA2" 726 727config 8260_PCI9_IDMA3 728 bool "IDMA3" 729 730config 8260_PCI9_IDMA4 731 bool "IDMA4" 732 733endchoice 734 735source "drivers/pci/pcie/Kconfig" 736 737source "drivers/pci/Kconfig" 738 739source "drivers/pcmcia/Kconfig" 740 741source "drivers/pci/hotplug/Kconfig" 742 743config HAS_RAPIDIO 744 bool 745 default n 746 747config RAPIDIO 748 bool "RapidIO support" 749 depends on HAS_RAPIDIO 750 help 751 If you say Y here, the kernel will include drivers and 752 infrastructure code to support RapidIO interconnect devices. 753 754source "drivers/rapidio/Kconfig" 755 756endmenu 757 758menu "Advanced setup" 759 depends on PPC32 760 761config ADVANCED_OPTIONS 762 bool "Prompt for advanced kernel configuration options" 763 help 764 This option will enable prompting for a variety of advanced kernel 765 configuration options. These options can cause the kernel to not 766 work if they are set incorrectly, but can be used to optimize certain 767 aspects of kernel memory management. 768 769 Unless you know what you are doing, say N here. 770 771comment "Default settings for advanced configuration options are used" 772 depends on !ADVANCED_OPTIONS 773 774config LOWMEM_SIZE_BOOL 775 bool "Set maximum low memory" 776 depends on ADVANCED_OPTIONS 777 help 778 This option allows you to set the maximum amount of memory which 779 will be used as "low memory", that is, memory which the kernel can 780 access directly, without having to set up a kernel virtual mapping. 781 This can be useful in optimizing the layout of kernel virtual 782 memory. 783 784 Say N here unless you know what you are doing. 785 786config LOWMEM_SIZE 787 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 788 default "0x30000000" 789 790config LOWMEM_CAM_NUM_BOOL 791 bool "Set number of CAMs to use to map low memory" 792 depends on ADVANCED_OPTIONS && FSL_BOOKE 793 help 794 This option allows you to set the maximum number of CAM slots that 795 will be used to map low memory. There are a limited number of slots 796 available and even more limited number that will fit in the L1 MMU. 797 However, using more entries will allow mapping more low memory. This 798 can be useful in optimizing the layout of kernel virtual memory. 799 800 Say N here unless you know what you are doing. 801 802config LOWMEM_CAM_NUM 803 depends on FSL_BOOKE 804 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 805 default 3 806 807config RELOCATABLE 808 bool "Build a relocatable kernel (EXPERIMENTAL)" 809 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 810 help 811 This builds a kernel image that is capable of running at the 812 location the kernel is loaded at (some alignment restrictions may 813 exist). 814 815 One use is for the kexec on panic case where the recovery kernel 816 must live at a different physical address than the primary 817 kernel. 818 819 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 820 it has been loaded at and the compile time physical addresses 821 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 822 setting can still be useful to bootwrappers that need to know the 823 load location of the kernel (eg. u-boot/mkimage). 824 825config PAGE_OFFSET_BOOL 826 bool "Set custom page offset address" 827 depends on ADVANCED_OPTIONS 828 help 829 This option allows you to set the kernel virtual address at which 830 the kernel will map low memory. This can be useful in optimizing 831 the virtual memory layout of the system. 832 833 Say N here unless you know what you are doing. 834 835config PAGE_OFFSET 836 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 837 default "0xc0000000" 838 839config KERNEL_START_BOOL 840 bool "Set custom kernel base address" 841 depends on ADVANCED_OPTIONS 842 help 843 This option allows you to set the kernel virtual address at which 844 the kernel will be loaded. Normally this should match PAGE_OFFSET 845 however there are times (like kdump) that one might not want them 846 to be the same. 847 848 Say N here unless you know what you are doing. 849 850config KERNEL_START 851 hex "Virtual address of kernel base" if KERNEL_START_BOOL 852 default PAGE_OFFSET if PAGE_OFFSET_BOOL 853 default "0xc2000000" if CRASH_DUMP 854 default "0xc0000000" 855 856config PHYSICAL_START_BOOL 857 bool "Set physical address where the kernel is loaded" 858 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 859 help 860 This gives the physical address where the kernel is loaded. 861 862 Say N here unless you know what you are doing. 863 864config PHYSICAL_START 865 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 866 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP 867 default "0x00000000" 868 869config PHYSICAL_ALIGN 870 hex 871 default "0x04000000" if FSL_BOOKE 872 help 873 This value puts the alignment restrictions on physical address 874 where kernel is loaded and run from. Kernel is compiled for an 875 address which meets above alignment restriction. 876 877config TASK_SIZE_BOOL 878 bool "Set custom user task size" 879 depends on ADVANCED_OPTIONS 880 help 881 This option allows you to set the amount of virtual address space 882 allocated to user tasks. This can be useful in optimizing the 883 virtual memory layout of the system. 884 885 Say N here unless you know what you are doing. 886 887config TASK_SIZE 888 hex "Size of user task space" if TASK_SIZE_BOOL 889 default "0x80000000" if PPC_PREP || PPC_8xx 890 default "0xc0000000" 891 892config CONSISTENT_SIZE_BOOL 893 bool "Set custom consistent memory pool size" 894 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 895 help 896 This option allows you to set the size of the 897 consistent memory pool. This pool of virtual memory 898 is used to make consistent memory allocations. 899 900config CONSISTENT_SIZE 901 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 902 default "0x00200000" if NOT_COHERENT_CACHE 903 904config PIN_TLB 905 bool "Pinned Kernel TLBs (860 ONLY)" 906 depends on ADVANCED_OPTIONS && 8xx 907endmenu 908 909if PPC64 910config RELOCATABLE 911 bool "Build a relocatable kernel" 912 help 913 This builds a kernel image that is capable of running anywhere 914 in the RMA (real memory area) at any 16k-aligned base address. 915 The kernel is linked as a position-independent executable (PIE) 916 and contains dynamic relocations which are processed early 917 in the bootup process. 918 919 One use is for the kexec on panic case where the recovery kernel 920 must live at a different physical address than the primary 921 kernel. 922 923config PAGE_OFFSET 924 hex 925 default "0xc000000000000000" 926config KERNEL_START 927 hex 928 default "0xc000000000000000" 929config PHYSICAL_START 930 hex 931 default "0x00000000" 932endif 933 934source "net/Kconfig" 935 936source "drivers/Kconfig" 937 938source "fs/Kconfig" 939 940source "arch/powerpc/sysdev/qe_lib/Kconfig" 941 942source "lib/Kconfig" 943 944source "arch/powerpc/Kconfig.debug" 945 946source "security/Kconfig" 947 948config KEYS_COMPAT 949 bool 950 depends on COMPAT && KEYS 951 default y 952 953source "crypto/Kconfig" 954 955config PPC_CLOCK 956 bool 957 default n 958 select HAVE_CLK 959 960config PPC_LIB_RHEAP 961 bool 962 963source "arch/powerpc/kvm/Kconfig" 964