1source "arch/powerpc/platforms/Kconfig.cputype" 2 3config PPC32 4 bool 5 default y if !PPC64 6 7config 32BIT 8 bool 9 default y if PPC32 10 11config 64BIT 12 bool 13 default y if PPC64 14 15config WORD_SIZE 16 int 17 default 64 if PPC64 18 default 32 if !PPC64 19 20config ARCH_PHYS_ADDR_T_64BIT 21 def_bool PPC64 || PHYS_64BIT 22 23config ARCH_DMA_ADDR_T_64BIT 24 def_bool ARCH_PHYS_ADDR_T_64BIT 25 26config MMU 27 bool 28 default y 29 30config GENERIC_CMOS_UPDATE 31 def_bool y 32 33config GENERIC_TIME_VSYSCALL 34 def_bool y 35 36config GENERIC_CLOCKEVENTS 37 def_bool y 38 39config HAVE_SETUP_PER_CPU_AREA 40 def_bool PPC64 41 42config NEED_PER_CPU_EMBED_FIRST_CHUNK 43 def_bool PPC64 44 45config NR_IRQS 46 int "Number of virtual interrupt numbers" 47 range 32 32768 48 default "512" 49 help 50 This defines the number of virtual interrupt numbers the kernel 51 can manage. Virtual interrupt numbers are what you see in 52 /proc/interrupts. If you configure your system to have too few, 53 drivers will fail to load or worse - handle with care. 54 55config STACKTRACE_SUPPORT 56 bool 57 default y 58 59config HAVE_LATENCYTOP_SUPPORT 60 def_bool y 61 62config TRACE_IRQFLAGS_SUPPORT 63 bool 64 default y 65 66config LOCKDEP_SUPPORT 67 bool 68 default y 69 70config RWSEM_GENERIC_SPINLOCK 71 bool 72 73config RWSEM_XCHGADD_ALGORITHM 74 bool 75 default y 76 77config GENERIC_LOCKBREAK 78 bool 79 default y 80 depends on SMP && PREEMPT 81 82config ARCH_HAS_ILOG2_U32 83 bool 84 default y 85 86config ARCH_HAS_ILOG2_U64 87 bool 88 default y if 64BIT 89 90config GENERIC_HWEIGHT 91 bool 92 default y 93 94config GENERIC_GPIO 95 bool 96 help 97 Generic GPIO API support 98 99config ARCH_NO_VIRT_TO_BUS 100 def_bool PPC64 101 102config PPC 103 bool 104 default y 105 select OF 106 select OF_EARLY_FLATTREE 107 select HAVE_FTRACE_MCOUNT_RECORD 108 select HAVE_DYNAMIC_FTRACE 109 select HAVE_FUNCTION_TRACER 110 select HAVE_FUNCTION_GRAPH_TRACER 111 select ARCH_WANT_OPTIONAL_GPIOLIB 112 select HAVE_IDE 113 select HAVE_IOREMAP_PROT 114 select HAVE_EFFICIENT_UNALIGNED_ACCESS 115 select HAVE_KPROBES 116 select HAVE_ARCH_KGDB 117 select HAVE_KRETPROBES 118 select HAVE_ARCH_TRACEHOOK 119 select HAVE_MEMBLOCK 120 select HAVE_MEMBLOCK_NODE_MAP 121 select HAVE_DMA_ATTRS 122 select HAVE_DMA_API_DEBUG 123 select USE_GENERIC_SMP_HELPERS if SMP 124 select HAVE_OPROFILE 125 select HAVE_SYSCALL_WRAPPERS if PPC64 126 select GENERIC_ATOMIC64 if PPC32 127 select HAVE_IRQ_WORK 128 select HAVE_PERF_EVENTS 129 select HAVE_REGS_AND_STACK_ACCESS_API 130 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64 131 select HAVE_GENERIC_HARDIRQS 132 select SPARSE_IRQ 133 select IRQ_PER_CPU 134 select IRQ_DOMAIN 135 select GENERIC_IRQ_SHOW 136 select GENERIC_IRQ_SHOW_LEVEL 137 select IRQ_FORCED_THREADING 138 select HAVE_RCU_TABLE_FREE if SMP 139 select HAVE_SYSCALL_TRACEPOINTS 140 select HAVE_BPF_JIT if PPC64 141 select HAVE_ARCH_JUMP_LABEL 142 select ARCH_HAVE_NMI_SAFE_CMPXCHG 143 select GENERIC_SMP_IDLE_THREAD 144 145config EARLY_PRINTK 146 bool 147 default y 148 149config COMPAT 150 bool 151 default y if PPC64 152 select COMPAT_BINFMT_ELF 153 select ARCH_WANT_OLD_COMPAT_IPC 154 155config SYSVIPC_COMPAT 156 bool 157 depends on COMPAT && SYSVIPC 158 default y 159 160# All PPC32s use generic nvram driver through ppc_md 161config GENERIC_NVRAM 162 bool 163 default y if PPC32 164 165config SCHED_OMIT_FRAME_POINTER 166 bool 167 default y 168 169config ARCH_MAY_HAVE_PC_FDC 170 bool 171 default !PPC_PSERIES || PCI 172 173config PPC_OF 174 def_bool y 175 176config PPC_UDBG_16550 177 bool 178 default n 179 180config GENERIC_TBSYNC 181 bool 182 default y if PPC32 && SMP 183 default n 184 185config AUDIT_ARCH 186 bool 187 default y 188 189config GENERIC_BUG 190 bool 191 default y 192 depends on BUG 193 194config SYS_SUPPORTS_APM_EMULATION 195 default y if PMAC_APM_EMU 196 bool 197 198config EPAPR_BOOT 199 bool 200 help 201 Used to allow a board to specify it wants an ePAPR compliant wrapper. 202 default n 203 204config DEFAULT_UIMAGE 205 bool 206 help 207 Used to allow a board to specify it wants a uImage built by default 208 default n 209 210config REDBOOT 211 bool 212 213config ARCH_HIBERNATION_POSSIBLE 214 bool 215 default y 216 217config ARCH_SUSPEND_POSSIBLE 218 def_bool y 219 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 220 (PPC_85xx && !SMP) || PPC_86xx || PPC_PSERIES || 44x || 40x 221 222config PPC_DCR_NATIVE 223 bool 224 default n 225 226config PPC_DCR_MMIO 227 bool 228 default n 229 230config PPC_DCR 231 bool 232 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO 233 default y 234 235config PPC_OF_PLATFORM_PCI 236 bool 237 depends on PCI 238 depends on PPC64 # not supported on 32 bits yet 239 default n 240 241config ARCH_SUPPORTS_DEBUG_PAGEALLOC 242 def_bool y 243 244config PPC_ADV_DEBUG_REGS 245 bool 246 depends on 40x || BOOKE 247 default y 248 249config PPC_ADV_DEBUG_IACS 250 int 251 depends on PPC_ADV_DEBUG_REGS 252 default 4 if 44x 253 default 2 254 255config PPC_ADV_DEBUG_DACS 256 int 257 depends on PPC_ADV_DEBUG_REGS 258 default 2 259 260config PPC_ADV_DEBUG_DVCS 261 int 262 depends on PPC_ADV_DEBUG_REGS 263 default 2 if 44x 264 default 0 265 266config PPC_ADV_DEBUG_DAC_RANGE 267 bool 268 depends on PPC_ADV_DEBUG_REGS && 44x 269 default y 270 271source "init/Kconfig" 272 273source "kernel/Kconfig.freezer" 274 275source "arch/powerpc/sysdev/Kconfig" 276source "arch/powerpc/platforms/Kconfig" 277 278menu "Kernel options" 279 280config HIGHMEM 281 bool "High memory support" 282 depends on PPC32 283 284source kernel/time/Kconfig 285source kernel/Kconfig.hz 286source kernel/Kconfig.preempt 287source "fs/Kconfig.binfmt" 288 289config HUGETLB_PAGE_SIZE_VARIABLE 290 bool 291 depends on HUGETLB_PAGE 292 default y 293 294config MATH_EMULATION 295 bool "Math emulation" 296 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500 297 ---help--- 298 Some PowerPC chips designed for embedded applications do not have 299 a floating-point unit and therefore do not implement the 300 floating-point instructions in the PowerPC instruction set. If you 301 say Y here, the kernel will include code to emulate a floating-point 302 unit, which will allow programs that use floating-point 303 instructions to run. 304 305config 8XX_MINIMAL_FPEMU 306 bool "Minimal math emulation for 8xx" 307 depends on 8xx && !MATH_EMULATION 308 help 309 Older arch/ppc kernels still emulated a few floating point 310 instructions such as load and store, even when full math 311 emulation is disabled. Say "Y" here if you want to preserve 312 this behavior. 313 314 It is recommended that you build a soft-float userspace instead. 315 316config IOMMU_HELPER 317 def_bool PPC64 318 319config SWIOTLB 320 bool "SWIOTLB support" 321 default n 322 select IOMMU_HELPER 323 ---help--- 324 Support for IO bounce buffering for systems without an IOMMU. 325 This allows us to DMA to the full physical address space on 326 platforms where the size of a physical address is larger 327 than the bus address. Not all platforms support this. 328 329config HOTPLUG_CPU 330 bool "Support for enabling/disabling CPUs" 331 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC || PPC_POWERNV) 332 ---help--- 333 Say Y here to be able to disable and re-enable individual 334 CPUs at runtime on SMP machines. 335 336 Say N if you are unsure. 337 338config ARCH_CPU_PROBE_RELEASE 339 def_bool y 340 depends on HOTPLUG_CPU 341 342config ARCH_ENABLE_MEMORY_HOTPLUG 343 def_bool y 344 345config ARCH_HAS_WALK_MEMORY 346 def_bool y 347 348config ARCH_ENABLE_MEMORY_HOTREMOVE 349 def_bool y 350 351config KEXEC 352 bool "kexec system call (EXPERIMENTAL)" 353 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP && !PPC_47x)) && EXPERIMENTAL 354 help 355 kexec is a system call that implements the ability to shutdown your 356 current kernel, and to start another kernel. It is like a reboot 357 but it is independent of the system firmware. And like a reboot 358 you can start any kernel with it, not just Linux. 359 360 The name comes from the similarity to the exec system call. 361 362 It is an ongoing process to be certain the hardware in a machine 363 is properly shutdown, so do not be surprised if this code does not 364 initially work for you. It may help to enable device hotplugging 365 support. As of this writing the exact hardware interface is 366 strongly in flux, so no good recommendation can be made. 367 368config CRASH_DUMP 369 bool "Build a kdump crash kernel" 370 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP && !PPC_47x) 371 select RELOCATABLE if PPC64 || 44x 372 select DYNAMIC_MEMSTART if FSL_BOOKE 373 help 374 Build a kernel suitable for use as a kdump capture kernel. 375 The same kernel binary can be used as production kernel and dump 376 capture kernel. 377 378config FA_DUMP 379 bool "Firmware-assisted dump" 380 depends on PPC64 && PPC_RTAS && CRASH_DUMP 381 help 382 A robust mechanism to get reliable kernel crash dump with 383 assistance from firmware. This approach does not use kexec, 384 instead firmware assists in booting the kdump kernel 385 while preserving memory contents. Firmware-assisted dump 386 is meant to be a kdump replacement offering robustness and 387 speed not possible without system firmware assistance. 388 389 If unsure, say "N" 390 391config IRQ_ALL_CPUS 392 bool "Distribute interrupts on all CPUs by default" 393 depends on SMP && !MV64360 394 help 395 This option gives the kernel permission to distribute IRQs across 396 multiple CPUs. Saying N here will route all IRQs to the first 397 CPU. Generally saying Y is safe, although some problems have been 398 reported with SMP Power Macintoshes with this option enabled. 399 400config NUMA 401 bool "NUMA support" 402 depends on PPC64 403 default y if SMP && PPC_PSERIES 404 405config NODES_SHIFT 406 int 407 default "8" if PPC64 408 default "4" 409 depends on NEED_MULTIPLE_NODES 410 411config MAX_ACTIVE_REGIONS 412 int 413 default "256" if PPC64 414 default "32" 415 416config ARCH_SELECT_MEMORY_MODEL 417 def_bool y 418 depends on PPC64 419 420config ARCH_FLATMEM_ENABLE 421 def_bool y 422 depends on (PPC64 && !NUMA) || PPC32 423 424config ARCH_SPARSEMEM_ENABLE 425 def_bool y 426 depends on PPC64 427 select SPARSEMEM_VMEMMAP_ENABLE 428 429config ARCH_SPARSEMEM_DEFAULT 430 def_bool y 431 depends on (SMP && PPC_PSERIES) || PPC_PS3 432 433config SYS_SUPPORTS_HUGETLBFS 434 bool 435 436source "mm/Kconfig" 437 438config ARCH_MEMORY_PROBE 439 def_bool y 440 depends on MEMORY_HOTPLUG 441 442# Some NUMA nodes have memory ranges that span 443# other nodes. Even though a pfn is valid and 444# between a node's start and end pfns, it may not 445# reside on that node. See memmap_init_zone() 446# for details. 447config NODES_SPAN_OTHER_NODES 448 def_bool y 449 depends on NEED_MULTIPLE_NODES 450 451config PPC_HAS_HASH_64K 452 bool 453 depends on PPC64 454 default n 455 456config STDBINUTILS 457 bool "Using standard binutils settings" 458 depends on 44x 459 default y 460 help 461 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 462 Note, that kernel will be able to run only those applications, 463 which had been compiled using binutils later than 2.17.50.0.3 with 464 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 465 the older binutils, you can patch them with a trivial patch, which 466 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 467 468choice 469 prompt "Page size" 470 default PPC_4K_PAGES 471 help 472 Select the kernel logical page size. Increasing the page size 473 will reduce software overhead at each page boundary, allow 474 hardware prefetch mechanisms to be more effective, and allow 475 larger dma transfers increasing IO efficiency and reducing 476 overhead. However the utilization of memory will increase. 477 For example, each cached file will using a multiple of the 478 page size to hold its contents and the difference between the 479 end of file and the end of page is wasted. 480 481 Some dedicated systems, such as software raid serving with 482 accelerated calculations, have shown significant increases. 483 484 If you configure a 64 bit kernel for 64k pages but the 485 processor does not support them, then the kernel will simulate 486 them with 4k pages, loading them on demand, but with the 487 reduced software overhead and larger internal fragmentation. 488 For the 32 bit kernel, a large page option will not be offered 489 unless it is supported by the configured processor. 490 491 If unsure, choose 4K_PAGES. 492 493config PPC_4K_PAGES 494 bool "4k page size" 495 496config PPC_16K_PAGES 497 bool "16k page size" if 44x 498 499config PPC_64K_PAGES 500 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64 501 select PPC_HAS_HASH_64K if PPC_STD_MMU_64 502 503config PPC_256K_PAGES 504 bool "256k page size" if 44x 505 depends on !STDBINUTILS 506 help 507 Make the page size 256k. 508 509 As the ELF standard only requires alignment to support page 510 sizes up to 64k, you will need to compile all of your user 511 space applications with a non-standard binutils settings 512 (see the STDBINUTILS description for details). 513 514 Say N unless you know what you are doing. 515 516endchoice 517 518config FORCE_MAX_ZONEORDER 519 int "Maximum zone order" 520 range 9 64 if PPC64 && PPC_64K_PAGES 521 default "9" if PPC64 && PPC_64K_PAGES 522 range 13 64 if PPC64 && !PPC_64K_PAGES 523 default "13" if PPC64 && !PPC_64K_PAGES 524 range 9 64 if PPC32 && PPC_16K_PAGES 525 default "9" if PPC32 && PPC_16K_PAGES 526 range 7 64 if PPC32 && PPC_64K_PAGES 527 default "7" if PPC32 && PPC_64K_PAGES 528 range 5 64 if PPC32 && PPC_256K_PAGES 529 default "5" if PPC32 && PPC_256K_PAGES 530 range 11 64 531 default "11" 532 help 533 The kernel memory allocator divides physically contiguous memory 534 blocks into "zones", where each zone is a power of two number of 535 pages. This option selects the largest power of two that the kernel 536 keeps in the memory allocator. If you need to allocate very large 537 blocks of physically contiguous memory, then you may need to 538 increase this value. 539 540 This config option is actually maximum order plus one. For example, 541 a value of 11 means that the largest free memory block is 2^10 pages. 542 543 The page size is not necessarily 4KB. For example, on 64-bit 544 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 545 this in mind when choosing a value for this option. 546 547config PPC_SUBPAGE_PROT 548 bool "Support setting protections for 4k subpages" 549 depends on PPC_STD_MMU_64 && PPC_64K_PAGES 550 help 551 This option adds support for a system call to allow user programs 552 to set access permissions (read/write, readonly, or no access) 553 on the 4k subpages of each 64k page. 554 555config SCHED_SMT 556 bool "SMT (Hyperthreading) scheduler support" 557 depends on PPC64 && SMP 558 help 559 SMT scheduler support improves the CPU scheduler's decision making 560 when dealing with POWER5 cpus at a cost of slightly increased 561 overhead in some places. If unsure say N here. 562 563config CMDLINE_BOOL 564 bool "Default bootloader kernel arguments" 565 566config CMDLINE 567 string "Initial kernel command string" 568 depends on CMDLINE_BOOL 569 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 570 help 571 On some platforms, there is currently no way for the boot loader to 572 pass arguments to the kernel. For these platforms, you can supply 573 some command-line options at build time by entering them here. In 574 most cases you will need to specify the root device here. 575 576config EXTRA_TARGETS 577 string "Additional default image types" 578 help 579 List additional targets to be built by the bootwrapper here (separated 580 by spaces). This is useful for targets that depend of device tree 581 files in the .dts directory. 582 583 Targets in this list will be build as part of the default build 584 target, or when the user does a 'make zImage' or a 585 'make zImage.initrd'. 586 587 If unsure, leave blank 588 589config ARCH_WANTS_FREEZER_CONTROL 590 def_bool y 591 depends on ADB_PMU 592 593source kernel/power/Kconfig 594 595config SECCOMP 596 bool "Enable seccomp to safely compute untrusted bytecode" 597 depends on PROC_FS 598 default y 599 help 600 This kernel feature is useful for number crunching applications 601 that may need to compute untrusted bytecode during their 602 execution. By using pipes or other transports made available to 603 the process as file descriptors supporting the read/write 604 syscalls, it's possible to isolate those applications in 605 their own address space using seccomp. Once seccomp is 606 enabled via /proc/<pid>/seccomp, it cannot be disabled 607 and the task is only allowed to execute a few safe syscalls 608 defined by each seccomp mode. 609 610 If unsure, say Y. Only embedded should say N here. 611 612endmenu 613 614config ISA_DMA_API 615 bool 616 default PCI 617 618menu "Bus options" 619 620config ISA 621 bool "Support for ISA-bus hardware" 622 depends on PPC_PREP || PPC_CHRP 623 select PPC_I8259 624 help 625 Find out whether you have ISA slots on your motherboard. ISA is the 626 name of a bus system, i.e. the way the CPU talks to the other stuff 627 inside your box. If you have an Apple machine, say N here; if you 628 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If 629 you have an embedded board, consult your board documentation. 630 631config ZONE_DMA 632 bool 633 default y 634 635config NEED_DMA_MAP_STATE 636 def_bool (PPC64 || NOT_COHERENT_CACHE) 637 638config NEED_SG_DMA_LENGTH 639 def_bool y 640 641config GENERIC_ISA_DMA 642 bool 643 depends on ISA_DMA_API 644 default y 645 646config PPC_INDIRECT_PCI 647 bool 648 depends on PCI 649 default y if 40x || 44x 650 default n 651 652config EISA 653 bool 654 655config SBUS 656 bool 657 658config FSL_SOC 659 bool 660 select HAVE_CAN_FLEXCAN if NET && CAN 661 select PPC_CLOCK if CAN_FLEXCAN 662 663config FSL_PCI 664 bool 665 select PPC_INDIRECT_PCI 666 select PCI_QUIRKS 667 668config FSL_PMC 669 bool 670 default y 671 depends on SUSPEND && (PPC_85xx || PPC_86xx) 672 help 673 Freescale MPC85xx/MPC86xx power management controller support 674 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 675 676config PPC4xx_CPM 677 bool 678 default y 679 depends on SUSPEND && (44x || 40x) 680 help 681 PPC4xx Clock Power Management (CPM) support (suspend/resume). 682 It also enables support for two different idle states (idle-wait 683 and idle-doze). 684 685config 4xx_SOC 686 bool 687 688config FSL_LBC 689 bool "Freescale Local Bus support" 690 depends on FSL_SOC 691 help 692 Enables reporting of errors from the Freescale local bus 693 controller. Also contains some common code used by 694 drivers for specific local bus peripherals. 695 696config FSL_IFC 697 bool 698 depends on FSL_SOC 699 700config FSL_GTM 701 bool 702 depends on PPC_83xx || QUICC_ENGINE || CPM2 703 help 704 Freescale General-purpose Timers support 705 706# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 707config MCA 708 bool 709 710# Platforms that what PCI turned unconditionally just do select PCI 711# in their config node. Platforms that want to choose at config 712# time should select PPC_PCI_CHOICE 713config PPC_PCI_CHOICE 714 bool 715 716config PCI 717 bool "PCI support" if PPC_PCI_CHOICE 718 default y if !40x && !CPM2 && !8xx && !PPC_83xx \ 719 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON 720 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx 721 default PCI_QSPAN if !4xx && !CPM2 && 8xx 722 select ARCH_SUPPORTS_MSI 723 select GENERIC_PCI_IOMAP 724 help 725 Find out whether your system includes a PCI bus. PCI is the name of 726 a bus system, i.e. the way the CPU talks to the other stuff inside 727 your box. If you say Y here, the kernel will include drivers and 728 infrastructure code to support PCI bus devices. 729 730config PCI_DOMAINS 731 def_bool PCI 732 733config PCI_SYSCALL 734 def_bool PCI 735 736config PCI_QSPAN 737 bool "QSpan PCI" 738 depends on !4xx && !CPM2 && 8xx 739 select PPC_I8259 740 help 741 Say Y here if you have a system based on a Motorola 8xx-series 742 embedded processor with a QSPAN PCI interface, otherwise say N. 743 744config PCI_8260 745 bool 746 depends on PCI && 8260 747 select PPC_INDIRECT_PCI 748 default y 749 750config 8260_PCI9 751 bool "Enable workaround for MPC826x erratum PCI 9" 752 depends on PCI_8260 && !8272 753 default y 754 755source "drivers/pci/pcie/Kconfig" 756 757source "drivers/pci/Kconfig" 758 759source "drivers/pcmcia/Kconfig" 760 761source "drivers/pci/hotplug/Kconfig" 762 763config HAS_RAPIDIO 764 bool 765 default n 766 767config RAPIDIO 768 bool "RapidIO support" 769 depends on HAS_RAPIDIO || PCI 770 help 771 If you say Y here, the kernel will include drivers and 772 infrastructure code to support RapidIO interconnect devices. 773 774config FSL_RIO 775 bool "Freescale Embedded SRIO Controller support" 776 depends on RAPIDIO && HAS_RAPIDIO 777 default "n" 778 ---help--- 779 Include support for RapidIO controller on Freescale embedded 780 processors (MPC8548, MPC8641, etc). 781 782source "drivers/rapidio/Kconfig" 783 784endmenu 785 786config NONSTATIC_KERNEL 787 bool 788 default n 789 790menu "Advanced setup" 791 depends on PPC32 792 793config ADVANCED_OPTIONS 794 bool "Prompt for advanced kernel configuration options" 795 help 796 This option will enable prompting for a variety of advanced kernel 797 configuration options. These options can cause the kernel to not 798 work if they are set incorrectly, but can be used to optimize certain 799 aspects of kernel memory management. 800 801 Unless you know what you are doing, say N here. 802 803comment "Default settings for advanced configuration options are used" 804 depends on !ADVANCED_OPTIONS 805 806config LOWMEM_SIZE_BOOL 807 bool "Set maximum low memory" 808 depends on ADVANCED_OPTIONS 809 help 810 This option allows you to set the maximum amount of memory which 811 will be used as "low memory", that is, memory which the kernel can 812 access directly, without having to set up a kernel virtual mapping. 813 This can be useful in optimizing the layout of kernel virtual 814 memory. 815 816 Say N here unless you know what you are doing. 817 818config LOWMEM_SIZE 819 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 820 default "0x30000000" 821 822config LOWMEM_CAM_NUM_BOOL 823 bool "Set number of CAMs to use to map low memory" 824 depends on ADVANCED_OPTIONS && FSL_BOOKE 825 help 826 This option allows you to set the maximum number of CAM slots that 827 will be used to map low memory. There are a limited number of slots 828 available and even more limited number that will fit in the L1 MMU. 829 However, using more entries will allow mapping more low memory. This 830 can be useful in optimizing the layout of kernel virtual memory. 831 832 Say N here unless you know what you are doing. 833 834config LOWMEM_CAM_NUM 835 depends on FSL_BOOKE 836 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 837 default 3 838 839config DYNAMIC_MEMSTART 840 bool "Enable page aligned dynamic load address for kernel (EXPERIMENTAL)" 841 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x) 842 select NONSTATIC_KERNEL 843 help 844 This option enables the kernel to be loaded at any page aligned 845 physical address. The kernel creates a mapping from KERNELBASE to 846 the address where the kernel is loaded. The page size here implies 847 the TLB page size of the mapping for kernel on the particular platform. 848 Please refer to the init code for finding the TLB page size. 849 850 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE 851 kernel image, where the only restriction is the page aligned kernel 852 load address. When this option is enabled, the compile time physical 853 address CONFIG_PHYSICAL_START is ignored. 854 855 This option is overridden by CONFIG_RELOCATABLE 856 857config RELOCATABLE 858 bool "Build a relocatable kernel (EXPERIMENTAL)" 859 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && 44x 860 select NONSTATIC_KERNEL 861 help 862 This builds a kernel image that is capable of running at the 863 location the kernel is loaded at, without any alignment restrictions. 864 This feature is a superset of DYNAMIC_MEMSTART and hence overrides it. 865 866 One use is for the kexec on panic case where the recovery kernel 867 must live at a different physical address than the primary 868 kernel. 869 870 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 871 it has been loaded at and the compile time physical addresses 872 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 873 setting can still be useful to bootwrappers that need to know the 874 load address of the kernel (eg. u-boot/mkimage). 875 876config RELOCATABLE_PPC32 877 def_bool y 878 depends on PPC32 && RELOCATABLE 879 880config PAGE_OFFSET_BOOL 881 bool "Set custom page offset address" 882 depends on ADVANCED_OPTIONS 883 help 884 This option allows you to set the kernel virtual address at which 885 the kernel will map low memory. This can be useful in optimizing 886 the virtual memory layout of the system. 887 888 Say N here unless you know what you are doing. 889 890config PAGE_OFFSET 891 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 892 default "0xc0000000" 893 894config KERNEL_START_BOOL 895 bool "Set custom kernel base address" 896 depends on ADVANCED_OPTIONS 897 help 898 This option allows you to set the kernel virtual address at which 899 the kernel will be loaded. Normally this should match PAGE_OFFSET 900 however there are times (like kdump) that one might not want them 901 to be the same. 902 903 Say N here unless you know what you are doing. 904 905config KERNEL_START 906 hex "Virtual address of kernel base" if KERNEL_START_BOOL 907 default PAGE_OFFSET if PAGE_OFFSET_BOOL 908 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL 909 default "0xc0000000" 910 911config PHYSICAL_START_BOOL 912 bool "Set physical address where the kernel is loaded" 913 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 914 help 915 This gives the physical address where the kernel is loaded. 916 917 Say N here unless you know what you are doing. 918 919config PHYSICAL_START 920 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 921 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL 922 default "0x00000000" 923 924config PHYSICAL_ALIGN 925 hex 926 default "0x04000000" if FSL_BOOKE 927 help 928 This value puts the alignment restrictions on physical address 929 where kernel is loaded and run from. Kernel is compiled for an 930 address which meets above alignment restriction. 931 932config TASK_SIZE_BOOL 933 bool "Set custom user task size" 934 depends on ADVANCED_OPTIONS 935 help 936 This option allows you to set the amount of virtual address space 937 allocated to user tasks. This can be useful in optimizing the 938 virtual memory layout of the system. 939 940 Say N here unless you know what you are doing. 941 942config TASK_SIZE 943 hex "Size of user task space" if TASK_SIZE_BOOL 944 default "0x80000000" if PPC_PREP || PPC_8xx 945 default "0xc0000000" 946 947config CONSISTENT_SIZE_BOOL 948 bool "Set custom consistent memory pool size" 949 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 950 help 951 This option allows you to set the size of the 952 consistent memory pool. This pool of virtual memory 953 is used to make consistent memory allocations. 954 955config CONSISTENT_SIZE 956 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 957 default "0x00200000" if NOT_COHERENT_CACHE 958 959config PIN_TLB 960 bool "Pinned Kernel TLBs (860 ONLY)" 961 depends on ADVANCED_OPTIONS && 8xx 962endmenu 963 964if PPC64 965config RELOCATABLE 966 bool "Build a relocatable kernel" 967 select NONSTATIC_KERNEL 968 help 969 This builds a kernel image that is capable of running anywhere 970 in the RMA (real memory area) at any 16k-aligned base address. 971 The kernel is linked as a position-independent executable (PIE) 972 and contains dynamic relocations which are processed early 973 in the bootup process. 974 975 One use is for the kexec on panic case where the recovery kernel 976 must live at a different physical address than the primary 977 kernel. 978 979config PAGE_OFFSET 980 hex 981 default "0xc000000000000000" 982config KERNEL_START 983 hex 984 default "0xc000000000000000" 985config PHYSICAL_START 986 hex 987 default "0x00000000" 988endif 989 990source "net/Kconfig" 991 992source "drivers/Kconfig" 993 994source "fs/Kconfig" 995 996source "arch/powerpc/sysdev/qe_lib/Kconfig" 997 998source "lib/Kconfig" 999 1000source "arch/powerpc/Kconfig.debug" 1001 1002source "security/Kconfig" 1003 1004config KEYS_COMPAT 1005 bool 1006 depends on COMPAT && KEYS 1007 default y 1008 1009source "crypto/Kconfig" 1010 1011config PPC_CLOCK 1012 bool 1013 default n 1014 select HAVE_CLK 1015 1016config PPC_LIB_RHEAP 1017 bool 1018 1019source "arch/powerpc/kvm/Kconfig" 1020