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_DMA_ATTRS 121 select HAVE_DMA_API_DEBUG 122 select USE_GENERIC_SMP_HELPERS if SMP 123 select HAVE_OPROFILE 124 select HAVE_SYSCALL_WRAPPERS if PPC64 125 select GENERIC_ATOMIC64 if PPC32 126 select HAVE_IRQ_WORK 127 select HAVE_PERF_EVENTS 128 select HAVE_REGS_AND_STACK_ACCESS_API 129 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64 130 select HAVE_GENERIC_HARDIRQS 131 select HAVE_SPARSE_IRQ 132 select IRQ_PER_CPU 133 select GENERIC_IRQ_SHOW 134 select GENERIC_IRQ_SHOW_LEVEL 135 select HAVE_RCU_TABLE_FREE if SMP 136 select HAVE_SYSCALL_TRACEPOINTS 137 select HAVE_BPF_JIT if (PPC64 && NET) 138 select HAVE_ARCH_JUMP_LABEL 139 select ARCH_HAVE_NMI_SAFE_CMPXCHG 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 150config SYSVIPC_COMPAT 151 bool 152 depends on COMPAT && SYSVIPC 153 default y 154 155# All PPC32s use generic nvram driver through ppc_md 156config GENERIC_NVRAM 157 bool 158 default y if PPC32 159 160config SCHED_OMIT_FRAME_POINTER 161 bool 162 default y 163 164config ARCH_MAY_HAVE_PC_FDC 165 bool 166 default !PPC_PSERIES || PCI 167 168config PPC_OF 169 def_bool y 170 171config PPC_UDBG_16550 172 bool 173 default n 174 175config GENERIC_TBSYNC 176 bool 177 default y if PPC32 && SMP 178 default n 179 180config AUDIT_ARCH 181 bool 182 default y 183 184config GENERIC_BUG 185 bool 186 default y 187 depends on BUG 188 189config SYS_SUPPORTS_APM_EMULATION 190 default y if PMAC_APM_EMU 191 bool 192 193config EPAPR_BOOT 194 bool 195 help 196 Used to allow a board to specify it wants an ePAPR compliant wrapper. 197 default n 198 199config DEFAULT_UIMAGE 200 bool 201 help 202 Used to allow a board to specify it wants a uImage built by default 203 default n 204 205config REDBOOT 206 bool 207 208config ARCH_HIBERNATION_POSSIBLE 209 bool 210 default y 211 212config ARCH_SUSPEND_POSSIBLE 213 def_bool y 214 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \ 215 (PPC_85xx && !SMP) || PPC_86xx || PPC_PSERIES || 44x || 40x 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 239config PPC_ADV_DEBUG_REGS 240 bool 241 depends on 40x || BOOKE 242 default y 243 244config PPC_ADV_DEBUG_IACS 245 int 246 depends on PPC_ADV_DEBUG_REGS 247 default 4 if 44x 248 default 2 249 250config PPC_ADV_DEBUG_DACS 251 int 252 depends on PPC_ADV_DEBUG_REGS 253 default 2 254 255config PPC_ADV_DEBUG_DVCS 256 int 257 depends on PPC_ADV_DEBUG_REGS 258 default 2 if 44x 259 default 0 260 261config PPC_ADV_DEBUG_DAC_RANGE 262 bool 263 depends on PPC_ADV_DEBUG_REGS && 44x 264 default y 265 266source "init/Kconfig" 267 268source "kernel/Kconfig.freezer" 269 270source "arch/powerpc/sysdev/Kconfig" 271source "arch/powerpc/platforms/Kconfig" 272 273menu "Kernel options" 274 275config HIGHMEM 276 bool "High memory support" 277 depends on PPC32 278 279source kernel/time/Kconfig 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 && !PPC_47x)) && 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 366 select RELOCATABLE if PPC64 || FSL_BOOKE 367 help 368 Build a kernel suitable for use as a kdump capture kernel. 369 The same kernel binary can be used as production kernel and dump 370 capture kernel. 371 372config PHYP_DUMP 373 bool "Hypervisor-assisted dump (EXPERIMENTAL)" 374 depends on PPC_PSERIES && EXPERIMENTAL 375 help 376 Hypervisor-assisted dump is meant to be a kdump replacement 377 offering robustness and speed not possible without system 378 hypervisor assistance. 379 380 If unsure, say "N" 381 382config IRQ_ALL_CPUS 383 bool "Distribute interrupts on all CPUs by default" 384 depends on SMP && !MV64360 385 help 386 This option gives the kernel permission to distribute IRQs across 387 multiple CPUs. Saying N here will route all IRQs to the first 388 CPU. Generally saying Y is safe, although some problems have been 389 reported with SMP Power Macintoshes with this option enabled. 390 391config NUMA 392 bool "NUMA support" 393 depends on PPC64 394 default y if SMP && PPC_PSERIES 395 396config NODES_SHIFT 397 int 398 default "8" if PPC64 399 default "4" 400 depends on NEED_MULTIPLE_NODES 401 402config MAX_ACTIVE_REGIONS 403 int 404 default "256" if PPC64 405 default "32" 406 407config ARCH_SELECT_MEMORY_MODEL 408 def_bool y 409 depends on PPC64 410 411config ARCH_FLATMEM_ENABLE 412 def_bool y 413 depends on (PPC64 && !NUMA) || PPC32 414 415config ARCH_SPARSEMEM_ENABLE 416 def_bool y 417 depends on PPC64 418 select SPARSEMEM_VMEMMAP_ENABLE 419 420config ARCH_SPARSEMEM_DEFAULT 421 def_bool y 422 depends on (SMP && PPC_PSERIES) || PPC_PS3 423 424config ARCH_POPULATES_NODE_MAP 425 def_bool y 426 427config SYS_SUPPORTS_HUGETLBFS 428 bool 429 430source "mm/Kconfig" 431 432config ARCH_MEMORY_PROBE 433 def_bool y 434 depends on MEMORY_HOTPLUG 435 436# Some NUMA nodes have memory ranges that span 437# other nodes. Even though a pfn is valid and 438# between a node's start and end pfns, it may not 439# reside on that node. See memmap_init_zone() 440# for details. 441config NODES_SPAN_OTHER_NODES 442 def_bool y 443 depends on NEED_MULTIPLE_NODES 444 445config PPC_HAS_HASH_64K 446 bool 447 depends on PPC64 448 default n 449 450config STDBINUTILS 451 bool "Using standard binutils settings" 452 depends on 44x 453 default y 454 help 455 Turning this option off allows you to select 256KB PAGE_SIZE on 44x. 456 Note, that kernel will be able to run only those applications, 457 which had been compiled using binutils later than 2.17.50.0.3 with 458 '-zmax-page-size' set to 256K (the default is 64K). Or, if using 459 the older binutils, you can patch them with a trivial patch, which 460 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000. 461 462choice 463 prompt "Page size" 464 default PPC_4K_PAGES 465 help 466 Select the kernel logical page size. Increasing the page size 467 will reduce software overhead at each page boundary, allow 468 hardware prefetch mechanisms to be more effective, and allow 469 larger dma transfers increasing IO efficiency and reducing 470 overhead. However the utilization of memory will increase. 471 For example, each cached file will using a multiple of the 472 page size to hold its contents and the difference between the 473 end of file and the end of page is wasted. 474 475 Some dedicated systems, such as software raid serving with 476 accelerated calculations, have shown significant increases. 477 478 If you configure a 64 bit kernel for 64k pages but the 479 processor does not support them, then the kernel will simulate 480 them with 4k pages, loading them on demand, but with the 481 reduced software overhead and larger internal fragmentation. 482 For the 32 bit kernel, a large page option will not be offered 483 unless it is supported by the configured processor. 484 485 If unsure, choose 4K_PAGES. 486 487config PPC_4K_PAGES 488 bool "4k page size" 489 490config PPC_16K_PAGES 491 bool "16k page size" if 44x 492 493config PPC_64K_PAGES 494 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64 495 select PPC_HAS_HASH_64K if PPC_STD_MMU_64 496 497config PPC_256K_PAGES 498 bool "256k page size" if 44x 499 depends on !STDBINUTILS 500 help 501 Make the page size 256k. 502 503 As the ELF standard only requires alignment to support page 504 sizes up to 64k, you will need to compile all of your user 505 space applications with a non-standard binutils settings 506 (see the STDBINUTILS description for details). 507 508 Say N unless you know what you are doing. 509 510endchoice 511 512config FORCE_MAX_ZONEORDER 513 int "Maximum zone order" 514 range 9 64 if PPC64 && PPC_64K_PAGES 515 default "9" if PPC64 && PPC_64K_PAGES 516 range 13 64 if PPC64 && !PPC_64K_PAGES 517 default "13" if PPC64 && !PPC_64K_PAGES 518 range 9 64 if PPC32 && PPC_16K_PAGES 519 default "9" if PPC32 && PPC_16K_PAGES 520 range 7 64 if PPC32 && PPC_64K_PAGES 521 default "7" if PPC32 && PPC_64K_PAGES 522 range 5 64 if PPC32 && PPC_256K_PAGES 523 default "5" if PPC32 && PPC_256K_PAGES 524 range 11 64 525 default "11" 526 help 527 The kernel memory allocator divides physically contiguous memory 528 blocks into "zones", where each zone is a power of two number of 529 pages. This option selects the largest power of two that the kernel 530 keeps in the memory allocator. If you need to allocate very large 531 blocks of physically contiguous memory, then you may need to 532 increase this value. 533 534 This config option is actually maximum order plus one. For example, 535 a value of 11 means that the largest free memory block is 2^10 pages. 536 537 The page size is not necessarily 4KB. For example, on 64-bit 538 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep 539 this in mind when choosing a value for this option. 540 541config PPC_SUBPAGE_PROT 542 bool "Support setting protections for 4k subpages" 543 depends on PPC_STD_MMU_64 && PPC_64K_PAGES 544 help 545 This option adds support for a system call to allow user programs 546 to set access permissions (read/write, readonly, or no access) 547 on the 4k subpages of each 64k page. 548 549config SCHED_SMT 550 bool "SMT (Hyperthreading) scheduler support" 551 depends on PPC64 && SMP 552 help 553 SMT scheduler support improves the CPU scheduler's decision making 554 when dealing with POWER5 cpus at a cost of slightly increased 555 overhead in some places. If unsure say N here. 556 557config CMDLINE_BOOL 558 bool "Default bootloader kernel arguments" 559 560config CMDLINE 561 string "Initial kernel command string" 562 depends on CMDLINE_BOOL 563 default "console=ttyS0,9600 console=tty0 root=/dev/sda2" 564 help 565 On some platforms, there is currently no way for the boot loader to 566 pass arguments to the kernel. For these platforms, you can supply 567 some command-line options at build time by entering them here. In 568 most cases you will need to specify the root device here. 569 570config EXTRA_TARGETS 571 string "Additional default image types" 572 help 573 List additional targets to be built by the bootwrapper here (separated 574 by spaces). This is useful for targets that depend of device tree 575 files in the .dts directory. 576 577 Targets in this list will be build as part of the default build 578 target, or when the user does a 'make zImage' or a 579 'make zImage.initrd'. 580 581 If unsure, leave blank 582 583config ARCH_WANTS_FREEZER_CONTROL 584 def_bool y 585 depends on ADB_PMU 586 587source kernel/power/Kconfig 588 589config SECCOMP 590 bool "Enable seccomp to safely compute untrusted bytecode" 591 depends on PROC_FS 592 default y 593 help 594 This kernel feature is useful for number crunching applications 595 that may need to compute untrusted bytecode during their 596 execution. By using pipes or other transports made available to 597 the process as file descriptors supporting the read/write 598 syscalls, it's possible to isolate those applications in 599 their own address space using seccomp. Once seccomp is 600 enabled via /proc/<pid>/seccomp, it cannot be disabled 601 and the task is only allowed to execute a few safe syscalls 602 defined by each seccomp mode. 603 604 If unsure, say Y. Only embedded should say N here. 605 606endmenu 607 608config ISA_DMA_API 609 bool 610 default !PPC_ISERIES || PCI 611 612menu "Bus options" 613 614config ISA 615 bool "Support for ISA-bus hardware" 616 depends on PPC_PREP || PPC_CHRP 617 select PPC_I8259 618 help 619 Find out whether you have ISA slots on your motherboard. ISA is the 620 name of a bus system, i.e. the way the CPU talks to the other stuff 621 inside your box. If you have an Apple machine, say N here; if you 622 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If 623 you have an embedded board, consult your board documentation. 624 625config ZONE_DMA 626 bool 627 default y 628 629config NEED_DMA_MAP_STATE 630 def_bool (PPC64 || NOT_COHERENT_CACHE) 631 632config NEED_SG_DMA_LENGTH 633 def_bool y 634 635config GENERIC_ISA_DMA 636 bool 637 depends on ISA_DMA_API 638 default y 639 640config PPC_INDIRECT_PCI 641 bool 642 depends on PCI 643 default y if 40x || 44x 644 default n 645 646config EISA 647 bool 648 649config SBUS 650 bool 651 652config FSL_SOC 653 bool 654 select HAVE_CAN_FLEXCAN if NET && CAN 655 select PPC_CLOCK if CAN_FLEXCAN 656 657config FSL_PCI 658 bool 659 select PPC_INDIRECT_PCI 660 select PCI_QUIRKS 661 662config FSL_PMC 663 bool 664 default y 665 depends on SUSPEND && (PPC_85xx || PPC_86xx) 666 help 667 Freescale MPC85xx/MPC86xx power management controller support 668 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c 669 670config PPC4xx_CPM 671 bool 672 default y 673 depends on SUSPEND && (44x || 40x) 674 help 675 PPC4xx Clock Power Management (CPM) support (suspend/resume). 676 It also enables support for two different idle states (idle-wait 677 and idle-doze). 678 679config 4xx_SOC 680 bool 681 682config FSL_LBC 683 bool "Freescale Local Bus support" 684 depends on FSL_SOC 685 help 686 Enables reporting of errors from the Freescale local bus 687 controller. Also contains some common code used by 688 drivers for specific local bus peripherals. 689 690config FSL_GTM 691 bool 692 depends on PPC_83xx || QUICC_ENGINE || CPM2 693 help 694 Freescale General-purpose Timers support 695 696# Yes MCA RS/6000s exist but Linux-PPC does not currently support any 697config MCA 698 bool 699 700# Platforms that what PCI turned unconditionally just do select PCI 701# in their config node. Platforms that want to choose at config 702# time should select PPC_PCI_CHOICE 703config PPC_PCI_CHOICE 704 bool 705 706config PCI 707 bool "PCI support" if PPC_PCI_CHOICE 708 default y if !40x && !CPM2 && !8xx && !PPC_83xx \ 709 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON 710 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx 711 default PCI_QSPAN if !4xx && !CPM2 && 8xx 712 select ARCH_SUPPORTS_MSI 713 help 714 Find out whether your system includes a PCI bus. PCI is the name of 715 a bus system, i.e. the way the CPU talks to the other stuff inside 716 your box. If you say Y here, the kernel will include drivers and 717 infrastructure code to support PCI bus devices. 718 719config PCI_DOMAINS 720 def_bool PCI 721 722config PCI_SYSCALL 723 def_bool PCI 724 725config PCI_QSPAN 726 bool "QSpan PCI" 727 depends on !4xx && !CPM2 && 8xx 728 select PPC_I8259 729 help 730 Say Y here if you have a system based on a Motorola 8xx-series 731 embedded processor with a QSPAN PCI interface, otherwise say N. 732 733config PCI_8260 734 bool 735 depends on PCI && 8260 736 select PPC_INDIRECT_PCI 737 default y 738 739config 8260_PCI9 740 bool "Enable workaround for MPC826x erratum PCI 9" 741 depends on PCI_8260 && !8272 742 default y 743 744source "drivers/pci/pcie/Kconfig" 745 746source "drivers/pci/Kconfig" 747 748source "drivers/pcmcia/Kconfig" 749 750source "drivers/pci/hotplug/Kconfig" 751 752config HAS_RAPIDIO 753 bool 754 default n 755 756config RAPIDIO 757 bool "RapidIO support" 758 depends on HAS_RAPIDIO || PCI 759 help 760 If you say Y here, the kernel will include drivers and 761 infrastructure code to support RapidIO interconnect devices. 762 763config FSL_RIO 764 bool "Freescale Embedded SRIO Controller support" 765 depends on RAPIDIO && HAS_RAPIDIO 766 default "n" 767 ---help--- 768 Include support for RapidIO controller on Freescale embedded 769 processors (MPC8548, MPC8641, etc). 770 771source "drivers/rapidio/Kconfig" 772 773endmenu 774 775menu "Advanced setup" 776 depends on PPC32 777 778config ADVANCED_OPTIONS 779 bool "Prompt for advanced kernel configuration options" 780 help 781 This option will enable prompting for a variety of advanced kernel 782 configuration options. These options can cause the kernel to not 783 work if they are set incorrectly, but can be used to optimize certain 784 aspects of kernel memory management. 785 786 Unless you know what you are doing, say N here. 787 788comment "Default settings for advanced configuration options are used" 789 depends on !ADVANCED_OPTIONS 790 791config LOWMEM_SIZE_BOOL 792 bool "Set maximum low memory" 793 depends on ADVANCED_OPTIONS 794 help 795 This option allows you to set the maximum amount of memory which 796 will be used as "low memory", that is, memory which the kernel can 797 access directly, without having to set up a kernel virtual mapping. 798 This can be useful in optimizing the layout of kernel virtual 799 memory. 800 801 Say N here unless you know what you are doing. 802 803config LOWMEM_SIZE 804 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 805 default "0x30000000" 806 807config LOWMEM_CAM_NUM_BOOL 808 bool "Set number of CAMs to use to map low memory" 809 depends on ADVANCED_OPTIONS && FSL_BOOKE 810 help 811 This option allows you to set the maximum number of CAM slots that 812 will be used to map low memory. There are a limited number of slots 813 available and even more limited number that will fit in the L1 MMU. 814 However, using more entries will allow mapping more low memory. This 815 can be useful in optimizing the layout of kernel virtual memory. 816 817 Say N here unless you know what you are doing. 818 819config LOWMEM_CAM_NUM 820 depends on FSL_BOOKE 821 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL 822 default 3 823 824config RELOCATABLE 825 bool "Build a relocatable kernel (EXPERIMENTAL)" 826 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || PPC_47x) 827 help 828 This builds a kernel image that is capable of running at the 829 location the kernel is loaded at (some alignment restrictions may 830 exist). 831 832 One use is for the kexec on panic case where the recovery kernel 833 must live at a different physical address than the primary 834 kernel. 835 836 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address 837 it has been loaded at and the compile time physical addresses 838 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START 839 setting can still be useful to bootwrappers that need to know the 840 load location of the kernel (eg. u-boot/mkimage). 841 842config PAGE_OFFSET_BOOL 843 bool "Set custom page offset address" 844 depends on ADVANCED_OPTIONS 845 help 846 This option allows you to set the kernel virtual address at which 847 the kernel will map low memory. This can be useful in optimizing 848 the virtual memory layout of the system. 849 850 Say N here unless you know what you are doing. 851 852config PAGE_OFFSET 853 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL 854 default "0xc0000000" 855 856config KERNEL_START_BOOL 857 bool "Set custom kernel base address" 858 depends on ADVANCED_OPTIONS 859 help 860 This option allows you to set the kernel virtual address at which 861 the kernel will be loaded. Normally this should match PAGE_OFFSET 862 however there are times (like kdump) that one might not want them 863 to be the same. 864 865 Say N here unless you know what you are doing. 866 867config KERNEL_START 868 hex "Virtual address of kernel base" if KERNEL_START_BOOL 869 default PAGE_OFFSET if PAGE_OFFSET_BOOL 870 default "0xc2000000" if CRASH_DUMP && !RELOCATABLE 871 default "0xc0000000" 872 873config PHYSICAL_START_BOOL 874 bool "Set physical address where the kernel is loaded" 875 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE 876 help 877 This gives the physical address where the kernel is loaded. 878 879 Say N here unless you know what you are doing. 880 881config PHYSICAL_START 882 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL 883 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !RELOCATABLE 884 default "0x00000000" 885 886config PHYSICAL_ALIGN 887 hex 888 default "0x04000000" if FSL_BOOKE 889 help 890 This value puts the alignment restrictions on physical address 891 where kernel is loaded and run from. Kernel is compiled for an 892 address which meets above alignment restriction. 893 894config TASK_SIZE_BOOL 895 bool "Set custom user task size" 896 depends on ADVANCED_OPTIONS 897 help 898 This option allows you to set the amount of virtual address space 899 allocated to user tasks. This can be useful in optimizing the 900 virtual memory layout of the system. 901 902 Say N here unless you know what you are doing. 903 904config TASK_SIZE 905 hex "Size of user task space" if TASK_SIZE_BOOL 906 default "0x80000000" if PPC_PREP || PPC_8xx 907 default "0xc0000000" 908 909config CONSISTENT_SIZE_BOOL 910 bool "Set custom consistent memory pool size" 911 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE 912 help 913 This option allows you to set the size of the 914 consistent memory pool. This pool of virtual memory 915 is used to make consistent memory allocations. 916 917config CONSISTENT_SIZE 918 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL 919 default "0x00200000" if NOT_COHERENT_CACHE 920 921config PIN_TLB 922 bool "Pinned Kernel TLBs (860 ONLY)" 923 depends on ADVANCED_OPTIONS && 8xx 924endmenu 925 926if PPC64 927config RELOCATABLE 928 bool "Build a relocatable kernel" 929 help 930 This builds a kernel image that is capable of running anywhere 931 in the RMA (real memory area) at any 16k-aligned base address. 932 The kernel is linked as a position-independent executable (PIE) 933 and contains dynamic relocations which are processed early 934 in the bootup process. 935 936 One use is for the kexec on panic case where the recovery kernel 937 must live at a different physical address than the primary 938 kernel. 939 940config PAGE_OFFSET 941 hex 942 default "0xc000000000000000" 943config KERNEL_START 944 hex 945 default "0xc000000000000000" 946config PHYSICAL_START 947 hex 948 default "0x00000000" 949endif 950 951source "net/Kconfig" 952 953source "drivers/Kconfig" 954 955source "fs/Kconfig" 956 957source "arch/powerpc/sysdev/qe_lib/Kconfig" 958 959source "lib/Kconfig" 960 961source "arch/powerpc/Kconfig.debug" 962 963source "security/Kconfig" 964 965config KEYS_COMPAT 966 bool 967 depends on COMPAT && KEYS 968 default y 969 970source "crypto/Kconfig" 971 972config PPC_CLOCK 973 bool 974 default n 975 select HAVE_CLK 976 977config PPC_LIB_RHEAP 978 bool 979 980source "arch/powerpc/kvm/Kconfig" 981