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 IRQ_PER_CPU 53 bool 54 default y 55 56config STACKTRACE_SUPPORT 57 bool 58 default y 59 60config HAVE_LATENCYTOP_SUPPORT 61 def_bool y 62 63config TRACE_IRQFLAGS_SUPPORT 64 bool 65 default y 66 67config LOCKDEP_SUPPORT 68 bool 69 default y 70 71config RWSEM_GENERIC_SPINLOCK 72 bool 73 74config RWSEM_XCHGADD_ALGORITHM 75 bool 76 default y 77 78config GENERIC_LOCKBREAK 79 bool 80 default y 81 depends on SMP && PREEMPT 82 83config ARCH_HAS_ILOG2_U32 84 bool 85 default y 86 87config ARCH_HAS_ILOG2_U64 88 bool 89 default y if 64BIT 90 91config GENERIC_HWEIGHT 92 bool 93 default y 94 95config GENERIC_FIND_NEXT_BIT 96 bool 97 default y 98 99config GENERIC_GPIO 100 bool 101 help 102 Generic GPIO API support 103 104config ARCH_NO_VIRT_TO_BUS 105 def_bool PPC64 106 107config PPC 108 bool 109 default y 110 select HAVE_FTRACE_MCOUNT_RECORD 111 select HAVE_DYNAMIC_FTRACE 112 select HAVE_FUNCTION_TRACER 113 select HAVE_FUNCTION_GRAPH_TRACER 114 select ARCH_WANT_OPTIONAL_GPIOLIB 115 select HAVE_IDE 116 select HAVE_IOREMAP_PROT 117 select HAVE_EFFICIENT_UNALIGNED_ACCESS 118 select HAVE_KPROBES 119 select HAVE_ARCH_KGDB 120 select HAVE_KRETPROBES 121 select HAVE_ARCH_TRACEHOOK 122 select HAVE_LMB 123 select HAVE_DMA_ATTRS if PPC64 124 select USE_GENERIC_SMP_HELPERS if SMP 125 select HAVE_OPROFILE 126 select HAVE_SYSCALL_WRAPPERS if PPC64 127 select GENERIC_ATOMIC64 if PPC32 128 select HAVE_PERF_COUNTERS 129 130config EARLY_PRINTK 131 bool 132 default y 133 134config COMPAT 135 bool 136 default y if PPC64 137 select COMPAT_BINFMT_ELF 138 139config SYSVIPC_COMPAT 140 bool 141 depends on COMPAT && SYSVIPC 142 default y 143 144# All PPC32s use generic nvram driver through ppc_md 145config GENERIC_NVRAM 146 bool 147 default y if PPC32 148 149config SCHED_OMIT_FRAME_POINTER 150 bool 151 default y 152 153config ARCH_MAY_HAVE_PC_FDC 154 bool 155 default !PPC_PSERIES || PCI 156 157config PPC_OF 158 def_bool y 159 160config OF 161 def_bool y 162 163config PPC_UDBG_16550 164 bool 165 default n 166 167config GENERIC_TBSYNC 168 bool 169 default y if PPC32 && SMP 170 default n 171 172config AUDIT_ARCH 173 bool 174 default y 175 176config GENERIC_BUG 177 bool 178 default y 179 depends on BUG 180 181config SYS_SUPPORTS_APM_EMULATION 182 default y if PMAC_APM_EMU 183 bool 184 185config DTC 186 bool 187 default y 188 189config DEFAULT_UIMAGE 190 bool 191 help 192 Used to allow a board to specify it wants a uImage built by default 193 default n 194 195config REDBOOT 196 bool 197 198config HIBERNATE_32 199 bool 200 depends on (PPC_PMAC && !SMP) || BROKEN 201 default y 202 203config HIBERNATE_64 204 bool 205 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL) 206 default y 207 208config ARCH_HIBERNATION_POSSIBLE 209 bool 210 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32) 211 default y 212 213config ARCH_SUSPEND_POSSIBLE 214 def_bool y 215 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx 216 217config PPC_DCR_NATIVE 218 bool 219 default n 220 221config PPC_DCR_MMIO 222 bool 223 default n 224 225config PPC_DCR 226 bool 227 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 228 default y 229 230config PPC_OF_PLATFORM_PCI 231 bool 232 depends on PCI 233 depends on PPC64 # not supported on 32 bits yet 234 default n 235 236config ARCH_SUPPORTS_DEBUG_PAGEALLOC 237 def_bool y 238 239source "init/Kconfig" 240 241source "kernel/Kconfig.freezer" 242 243source "arch/powerpc/sysdev/Kconfig" 244source "arch/powerpc/platforms/Kconfig" 245 246menu "Kernel options" 247 248config HIGHMEM 249 bool "High memory support" 250 depends on PPC32 251 252source kernel/time/Kconfig 253source kernel/Kconfig.hz 254source kernel/Kconfig.preempt 255source "fs/Kconfig.binfmt" 256 257config HUGETLB_PAGE_SIZE_VARIABLE 258 bool 259 depends on HUGETLB_PAGE 260 default y 261 262config MATH_EMULATION 263 bool "Math emulation" 264 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500 265 ---help--- 266 Some PowerPC chips designed for embedded applications do not have 267 a floating-point unit and therefore do not implement the 268 floating-point instructions in the PowerPC instruction set. If you 269 say Y here, the kernel will include code to emulate a floating-point 270 unit, which will allow programs that use floating-point 271 instructions to run. 272 273config 8XX_MINIMAL_FPEMU 274 bool "Minimal math emulation for 8xx" 275 depends on 8xx && !MATH_EMULATION 276 help 277 Older arch/ppc kernels still emulated a few floating point 278 instructions such as load and store, even when full math 279 emulation is disabled. Say "Y" here if you want to preserve 280 this behavior. 281 282 It is recommended that you build a soft-float userspace instead. 283 284config IOMMU_VMERGE 285 bool "Enable IOMMU virtual merging" 286 depends on PPC64 287 default y 288 help 289 Cause IO segments sent to a device for DMA to be merged virtually 290 by the IOMMU when they happen to have been allocated contiguously. 291 This doesn't add pressure to the IOMMU allocator. However, some 292 drivers don't support getting large merged segments coming back 293 from *_map_sg(). 294 295 Most drivers don't have this problem; it is safe to say Y here. 296 297config IOMMU_HELPER 298 def_bool PPC64 299 300config SWIOTLB 301 bool "SWIOTLB support" 302 default n 303 select IOMMU_HELPER 304 ---help--- 305 Support for IO bounce buffering for systems without an IOMMU. 306 This allows us to DMA to the full physical address space on 307 platforms where the size of a physical address is larger 308 than the bus address. Not all platforms support this. 309 310config PPC_NEED_DMA_SYNC_OPS 311 def_bool y 312 depends on (NOT_COHERENT_CACHE || SWIOTLB) 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 "4" 389 depends on NEED_MULTIPLE_NODES 390 391config ARCH_SELECT_MEMORY_MODEL 392 def_bool y 393 depends on PPC64 394 395config ARCH_FLATMEM_ENABLE 396 def_bool y 397 depends on (PPC64 && !NUMA) || PPC32 398 399config ARCH_SPARSEMEM_ENABLE 400 def_bool y 401 depends on PPC64 402 select SPARSEMEM_VMEMMAP_ENABLE 403 404config ARCH_SPARSEMEM_DEFAULT 405 def_bool y 406 depends on (SMP && PPC_PSERIES) || PPC_PS3 407 408config ARCH_POPULATES_NODE_MAP 409 def_bool y 410 411source "mm/Kconfig" 412 413config ARCH_MEMORY_PROBE 414 def_bool y 415 depends on MEMORY_HOTPLUG 416 417# Some NUMA nodes have memory ranges that span 418# other nodes. Even though a pfn is valid and 419# between a node's start and end pfns, it may not 420# reside on that node. See memmap_init_zone() 421# for details. 422config NODES_SPAN_OTHER_NODES 423 def_bool y 424 depends on NEED_MULTIPLE_NODES 425 426config PPC_HAS_HASH_64K 427 bool 428 depends on PPC64 429 default n 430 431config STDBINUTILS 432 bool "Using standard binutils settings" 433 depends on 44x 434 default y 435 help 436 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 437 Note, that kernel will be able to run only those applications, 438 which had been compiled using binutils later than 2.17.50.0.3 with 439 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 440 the older binutils, you can patch them with a trivial patch, which 441 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 442 443choice 444 prompt "Page size" 445 default PPC_4K_PAGES 446 help 447 Select the kernel logical page size. Increasing the page size 448 will reduce software overhead at each page boundary, allow 449 hardware prefetch mechanisms to be more effective, and allow 450 larger dma transfers increasing IO efficiency and reducing 451 overhead. However the utilization of memory will increase. 452 For example, each cached file will using a multiple of the 453 page size to hold its contents and the difference between the 454 end of file and the end of page is wasted. 455 456 Some dedicated systems, such as software raid serving with 457 accelerated calculations, have shown significant increases. 458 459 If you configure a 64 bit kernel for 64k pages but the 460 processor does not support them, then the kernel will simulate 461 them with 4k pages, loading them on demand, but with the 462 reduced software overhead and larger internal fragmentation. 463 For the 32 bit kernel, a large page option will not be offered 464 unless it is supported by the configured processor. 465 466 If unsure, choose 4K_PAGES. 467 468config PPC_4K_PAGES 469 bool "4k page size" 470 471config PPC_16K_PAGES 472 bool "16k page size" if 44x 473 474config PPC_64K_PAGES 475 bool "64k page size" if 44x || PPC_STD_MMU_64 476 select PPC_HAS_HASH_64K if PPC_STD_MMU_64 477 478config PPC_256K_PAGES 479 bool "256k page size" if 44x 480 depends on !STDBINUTILS 481 help 482 Make the page size 256k. 483 484 As the ELF standard only requires alignment to support page 485 sizes up to 64k, you will need to compile all of your user 486 space applications with a non-standard binutils settings 487 (see the STDBINUTILS description for details). 488 489 Say N unless you know what you are doing. 490 491endchoice 492 493config FORCE_MAX_ZONEORDER 494 int "Maximum zone order" 495 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES 496 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES 497 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES 498 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES 499 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES 500 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES 501 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES 502 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES 503 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES 504 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES 505 range 11 64 506 default "11" 507 help 508 The kernel memory allocator divides physically contiguous memory 509 blocks into "zones", where each zone is a power of two number of 510 pages. This option selects the largest power of two that the kernel 511 keeps in the memory allocator. If you need to allocate very large 512 blocks of physically contiguous memory, then you may need to 513 increase this value. 514 515 This config option is actually maximum order plus one. For example, 516 a value of 11 means that the largest free memory block is 2^10 pages. 517 518 The page size is not necessarily 4KB. For example, on 64-bit 519 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 520 this in mind when choosing a value for this option. 521 522config PPC_SUBPAGE_PROT 523 bool "Support setting protections for 4k subpages" 524 depends on PPC_STD_MMU_64 && PPC_64K_PAGES 525 help 526 This option adds support for a system call to allow user programs 527 to set access permissions (read/write, readonly, or no access) 528 on the 4k subpages of each 64k page. 529 530config SCHED_SMT 531 bool "SMT (Hyperthreading) scheduler support" 532 depends on PPC64 && SMP 533 help 534 SMT scheduler support improves the CPU scheduler's decision making 535 when dealing with POWER5 cpus at a cost of slightly increased 536 overhead in some places. If unsure say N here. 537 538config PROC_DEVICETREE 539 bool "Support for device tree in /proc" 540 depends on PROC_FS 541 help 542 This option adds a device-tree directory under /proc which contains 543 an image of the device tree that the kernel copies from Open 544 Firmware or other boot firmware. If unsure, say Y here. 545 546config CMDLINE_BOOL 547 bool "Default bootloader kernel arguments" 548 549config CMDLINE 550 string "Initial kernel command string" 551 depends on CMDLINE_BOOL 552 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 553 help 554 On some platforms, there is currently no way for the boot loader to 555 pass arguments to the kernel. For these platforms, you can supply 556 some command-line options at build time by entering them here. In 557 most cases you will need to specify the root device here. 558 559config EXTRA_TARGETS 560 string "Additional default image types" 561 help 562 List additional targets to be built by the bootwrapper here (separated 563 by spaces). This is useful for targets that depend of device tree 564 files in the .dts directory. 565 566 Targets in this list will be build as part of the default build 567 target, or when the user does a 'make zImage' or a 568 'make zImage.initrd'. 569 570 If unsure, leave blank 571 572if !44x || BROKEN 573config ARCH_WANTS_FREEZER_CONTROL 574 def_bool y 575 depends on ADB_PMU 576 577source kernel/power/Kconfig 578endif 579 580config SECCOMP 581 bool "Enable seccomp to safely compute untrusted bytecode" 582 depends on PROC_FS 583 default y 584 help 585 This kernel feature is useful for number crunching applications 586 that may need to compute untrusted bytecode during their 587 execution. By using pipes or other transports made available to 588 the process as file descriptors supporting the read/write 589 syscalls, it's possible to isolate those applications in 590 their own address space using seccomp. Once seccomp is 591 enabled via /proc/<pid>/seccomp, it cannot be disabled 592 and the task is only allowed to execute a few safe syscalls 593 defined by each seccomp mode. 594 595 If unsure, say Y. Only embedded should say N here. 596 597endmenu 598 599config ISA_DMA_API 600 bool 601 default !PPC_ISERIES || PCI 602 603menu "Bus options" 604 605config ISA 606 bool "Support for ISA-bus hardware" 607 depends on PPC_PREP || PPC_CHRP 608 select PPC_I8259 609 help 610 Find out whether you have ISA slots on your motherboard. ISA is the 611 name of a bus system, i.e. the way the CPU talks to the other stuff 612 inside your box. If you have an Apple machine, say N here; if you 613 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If 614 you have an embedded board, consult your board documentation. 615 616config ZONE_DMA 617 bool 618 default y 619 620config GENERIC_ISA_DMA 621 bool 622 depends on PPC64 || POWER4 || 6xx && !CPM2 623 default y 624 625config PPC_INDIRECT_PCI 626 bool 627 depends on PCI 628 default y if 40x || 44x 629 default n 630 631config EISA 632 bool 633 634config SBUS 635 bool 636 637config FSL_SOC 638 bool 639 640config FSL_PCI 641 bool 642 select PPC_INDIRECT_PCI 643 select PCI_QUIRKS 644 645config 4xx_SOC 646 bool 647 648config FSL_LBC 649 bool 650 help 651 Freescale Localbus support 652 653config FSL_GTM 654 bool 655 depends on PPC_83xx || QUICC_ENGINE || CPM2 656 help 657 Freescale General-purpose Timers support 658 659# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 660config MCA 661 bool 662 663# Platforms that what PCI turned unconditionally just do select PCI 664# in their config node. Platforms that want to choose at config 665# time should select PPC_PCI_CHOICE 666config PPC_PCI_CHOICE 667 bool 668 669config PCI 670 bool "PCI support" if PPC_PCI_CHOICE 671 default y if !40x && !CPM2 && !8xx && !PPC_83xx \ 672 && !PPC_85xx && !PPC_86xx 673 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx 674 default PCI_QSPAN if !4xx && !CPM2 && 8xx 675 select ARCH_SUPPORTS_MSI 676 help 677 Find out whether your system includes a PCI bus. PCI is the name of 678 a bus system, i.e. the way the CPU talks to the other stuff inside 679 your box. If you say Y here, the kernel will include drivers and 680 infrastructure code to support PCI bus devices. 681 682config PCI_DOMAINS 683 def_bool PCI 684 685config PCI_SYSCALL 686 def_bool PCI 687 688config PCI_QSPAN 689 bool "QSpan PCI" 690 depends on !4xx && !CPM2 && 8xx 691 select PPC_I8259 692 help 693 Say Y here if you have a system based on a Motorola 8xx-series 694 embedded processor with a QSPAN PCI interface, otherwise say N. 695 696config PCI_8260 697 bool 698 depends on PCI && 8260 699 select PPC_INDIRECT_PCI 700 default y 701 702config 8260_PCI9 703 bool "Enable workaround for MPC826x erratum PCI 9" 704 depends on PCI_8260 && !8272 705 default y 706 707choice 708 prompt "IDMA channel for PCI 9 workaround" 709 depends on 8260_PCI9 710 711config 8260_PCI9_IDMA1 712 bool "IDMA1" 713 714config 8260_PCI9_IDMA2 715 bool "IDMA2" 716 717config 8260_PCI9_IDMA3 718 bool "IDMA3" 719 720config 8260_PCI9_IDMA4 721 bool "IDMA4" 722 723endchoice 724 725source "drivers/pci/pcie/Kconfig" 726 727source "drivers/pci/Kconfig" 728 729source "drivers/pcmcia/Kconfig" 730 731source "drivers/pci/hotplug/Kconfig" 732 733config HAS_RAPIDIO 734 bool 735 default n 736 737config RAPIDIO 738 bool "RapidIO support" 739 depends on HAS_RAPIDIO 740 help 741 If you say Y here, the kernel will include drivers and 742 infrastructure code to support RapidIO interconnect devices. 743 744source "drivers/rapidio/Kconfig" 745 746endmenu 747 748menu "Advanced setup" 749 depends on PPC32 750 751config ADVANCED_OPTIONS 752 bool "Prompt for advanced kernel configuration options" 753 help 754 This option will enable prompting for a variety of advanced kernel 755 configuration options. These options can cause the kernel to not 756 work if they are set incorrectly, but can be used to optimize certain 757 aspects of kernel memory management. 758 759 Unless you know what you are doing, say N here. 760 761comment "Default settings for advanced configuration options are used" 762 depends on !ADVANCED_OPTIONS 763 764config LOWMEM_SIZE_BOOL 765 bool "Set maximum low memory" 766 depends on ADVANCED_OPTIONS 767 help 768 This option allows you to set the maximum amount of memory which 769 will be used as "low memory", that is, memory which the kernel can 770 access directly, without having to set up a kernel virtual mapping. 771 This can be useful in optimizing the layout of kernel virtual 772 memory. 773 774 Say N here unless you know what you are doing. 775 776config LOWMEM_SIZE 777 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 778 default "0x30000000" 779 780config LOWMEM_CAM_NUM_BOOL 781 bool "Set number of CAMs to use to map low memory" 782 depends on ADVANCED_OPTIONS && FSL_BOOKE 783 help 784 This option allows you to set the maximum number of CAM slots that 785 will be used to map low memory. There are a limited number of slots 786 available and even more limited number that will fit in the L1 MMU. 787 However, using more entries will allow mapping more low memory. This 788 can be useful in optimizing the layout of kernel virtual memory. 789 790 Say N here unless you know what you are doing. 791 792config LOWMEM_CAM_NUM 793 depends on FSL_BOOKE 794 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 795 default 3 796 797config RELOCATABLE 798 bool "Build a relocatable kernel (EXPERIMENTAL)" 799 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 800 help 801 This builds a kernel image that is capable of running at the 802 location the kernel is loaded at (some alignment restrictions may 803 exist). 804 805 One use is for the kexec on panic case where the recovery kernel 806 must live at a different physical address than the primary 807 kernel. 808 809 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 810 it has been loaded at and the compile time physical addresses 811 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 812 setting can still be useful to bootwrappers that need to know the 813 load location of the kernel (eg. u-boot/mkimage). 814 815config PAGE_OFFSET_BOOL 816 bool "Set custom page offset address" 817 depends on ADVANCED_OPTIONS 818 help 819 This option allows you to set the kernel virtual address at which 820 the kernel will map low memory. This can be useful in optimizing 821 the virtual memory layout of the system. 822 823 Say N here unless you know what you are doing. 824 825config PAGE_OFFSET 826 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 827 default "0xc0000000" 828 829config KERNEL_START_BOOL 830 bool "Set custom kernel base address" 831 depends on ADVANCED_OPTIONS 832 help 833 This option allows you to set the kernel virtual address at which 834 the kernel will be loaded. Normally this should match PAGE_OFFSET 835 however there are times (like kdump) that one might not want them 836 to be the same. 837 838 Say N here unless you know what you are doing. 839 840config KERNEL_START 841 hex "Virtual address of kernel base" if KERNEL_START_BOOL 842 default PAGE_OFFSET if PAGE_OFFSET_BOOL 843 default "0xc2000000" if CRASH_DUMP 844 default "0xc0000000" 845 846config PHYSICAL_START_BOOL 847 bool "Set physical address where the kernel is loaded" 848 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 849 help 850 This gives the physical address where the kernel is loaded. 851 852 Say N here unless you know what you are doing. 853 854config PHYSICAL_START 855 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 856 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP 857 default "0x00000000" 858 859config PHYSICAL_ALIGN 860 hex 861 default "0x04000000" if FSL_BOOKE 862 help 863 This value puts the alignment restrictions on physical address 864 where kernel is loaded and run from. Kernel is compiled for an 865 address which meets above alignment restriction. 866 867config TASK_SIZE_BOOL 868 bool "Set custom user task size" 869 depends on ADVANCED_OPTIONS 870 help 871 This option allows you to set the amount of virtual address space 872 allocated to user tasks. This can be useful in optimizing the 873 virtual memory layout of the system. 874 875 Say N here unless you know what you are doing. 876 877config TASK_SIZE 878 hex "Size of user task space" if TASK_SIZE_BOOL 879 default "0x80000000" if PPC_PREP || PPC_8xx 880 default "0xc0000000" 881 882config CONSISTENT_SIZE_BOOL 883 bool "Set custom consistent memory pool size" 884 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 885 help 886 This option allows you to set the size of the 887 consistent memory pool. This pool of virtual memory 888 is used to make consistent memory allocations. 889 890config CONSISTENT_SIZE 891 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 892 default "0x00200000" if NOT_COHERENT_CACHE 893 894config PIN_TLB 895 bool "Pinned Kernel TLBs (860 ONLY)" 896 depends on ADVANCED_OPTIONS && 8xx 897endmenu 898 899if PPC64 900config RELOCATABLE 901 bool "Build a relocatable kernel" 902 help 903 This builds a kernel image that is capable of running anywhere 904 in the RMA (real memory area) at any 16k-aligned base address. 905 The kernel is linked as a position-independent executable (PIE) 906 and contains dynamic relocations which are processed early 907 in the bootup process. 908 909 One use is for the kexec on panic case where the recovery kernel 910 must live at a different physical address than the primary 911 kernel. 912 913config PAGE_OFFSET 914 hex 915 default "0xc000000000000000" 916config KERNEL_START 917 hex 918 default "0xc000000000000000" 919config PHYSICAL_START 920 hex 921 default "0x00000000" 922endif 923 924source "net/Kconfig" 925 926source "drivers/Kconfig" 927 928source "fs/Kconfig" 929 930source "arch/powerpc/sysdev/qe_lib/Kconfig" 931 932source "lib/Kconfig" 933 934source "arch/powerpc/Kconfig.debug" 935 936source "security/Kconfig" 937 938config KEYS_COMPAT 939 bool 940 depends on COMPAT && KEYS 941 default y 942 943source "crypto/Kconfig" 944 945config PPC_CLOCK 946 bool 947 default n 948 select HAVE_CLK 949 950config PPC_LIB_RHEAP 951 bool 952 953source "arch/powerpc/kvm/Kconfig" 954