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