1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
5 mainmenu "Linux/PowerPC Kernel Configuration"
7 source "arch/powerpc/platforms/Kconfig.cputype"
22 config ARCH_PHYS_ADDR_T_64BIT
23 def_bool PPC64 || PHYS_64BIT
29 config GENERIC_CMOS_UPDATE
35 config GENERIC_TIME_VSYSCALL
38 config GENERIC_CLOCKEVENTS
41 config GENERIC_HARDIRQS
45 config GENERIC_HARDIRQS_NO__DO_IRQ
49 config HAVE_SETUP_PER_CPU_AREA
56 config STACKTRACE_SUPPORT
60 config HAVE_LATENCYTOP_SUPPORT
63 config TRACE_IRQFLAGS_SUPPORT
68 config LOCKDEP_SUPPORT
72 config RWSEM_GENERIC_SPINLOCK
75 config RWSEM_XCHGADD_ALGORITHM
79 config GENERIC_LOCKBREAK
82 depends on SMP && PREEMPT
84 config ARCH_HAS_ILOG2_U32
88 config ARCH_HAS_ILOG2_U64
92 config GENERIC_HWEIGHT
96 config GENERIC_FIND_NEXT_BIT
103 Generic GPIO API support
105 config ARCH_NO_VIRT_TO_BUS
111 select HAVE_FTRACE_MCOUNT_RECORD
112 select HAVE_DYNAMIC_FTRACE
113 select HAVE_FUNCTION_TRACER
114 select HAVE_FUNCTION_GRAPH_TRACER
115 select ARCH_WANT_OPTIONAL_GPIOLIB
117 select HAVE_IOREMAP_PROT
118 select HAVE_EFFICIENT_UNALIGNED_ACCESS
120 select HAVE_ARCH_KGDB
121 select HAVE_KRETPROBES
122 select HAVE_ARCH_TRACEHOOK
124 select HAVE_DMA_ATTRS if PPC64
125 select USE_GENERIC_SMP_HELPERS if SMP
127 select HAVE_SYSCALL_WRAPPERS if PPC64
136 select COMPAT_BINFMT_ELF
138 config SYSVIPC_COMPAT
140 depends on COMPAT && SYSVIPC
143 # All PPC32s use generic nvram driver through ppc_md
148 config SCHED_OMIT_FRAME_POINTER
152 config ARCH_MAY_HAVE_PC_FDC
154 default !PPC_PSERIES || PCI
162 config PPC_UDBG_16550
166 config GENERIC_TBSYNC
168 default y if PPC32 && SMP
180 config SYS_SUPPORTS_APM_EMULATION
181 default y if PMAC_APM_EMU
188 config DEFAULT_UIMAGE
191 Used to allow a board to specify it wants a uImage built by default
199 depends on (PPC_PMAC && !SMP) || BROKEN
204 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
207 config ARCH_HIBERNATION_POSSIBLE
209 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
212 config ARCH_SUSPEND_POSSIBLE
214 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
216 config PPC_DCR_NATIVE
226 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
229 config PPC_OF_PLATFORM_PCI
232 depends on PPC64 # not supported on 32 bits yet
235 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
238 source "init/Kconfig"
240 source "kernel/Kconfig.freezer"
242 source "arch/powerpc/sysdev/Kconfig"
243 source "arch/powerpc/platforms/Kconfig"
245 menu "Kernel options"
248 bool "High memory support"
251 source kernel/time/Kconfig
252 source kernel/Kconfig.hz
253 source kernel/Kconfig.preempt
254 source "fs/Kconfig.binfmt"
256 config HUGETLB_PAGE_SIZE_VARIABLE
258 depends on HUGETLB_PAGE
261 config MATH_EMULATION
262 bool "Math emulation"
263 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
265 Some PowerPC chips designed for embedded applications do not have
266 a floating-point unit and therefore do not implement the
267 floating-point instructions in the PowerPC instruction set. If you
268 say Y here, the kernel will include code to emulate a floating-point
269 unit, which will allow programs that use floating-point
272 config 8XX_MINIMAL_FPEMU
273 bool "Minimal math emulation for 8xx"
274 depends on 8xx && !MATH_EMULATION
276 Older arch/ppc kernels still emulated a few floating point
277 instructions such as load and store, even when full math
278 emulation is disabled. Say "Y" here if you want to preserve
281 It is recommended that you build a soft-float userspace instead.
284 bool "Enable IOMMU virtual merging"
288 Cause IO segments sent to a device for DMA to be merged virtually
289 by the IOMMU when they happen to have been allocated contiguously.
290 This doesn't add pressure to the IOMMU allocator. However, some
291 drivers don't support getting large merged segments coming back
294 Most drivers don't have this problem; it is safe to say Y here.
300 bool "SWIOTLB support"
304 Support for IO bounce buffering for systems without an IOMMU.
305 This allows us to DMA to the full physical address space on
306 platforms where the size of a physical address is larger
307 than the bus address. Not all platforms support this.
309 config PPC_NEED_DMA_SYNC_OPS
311 depends on (NOT_COHERENT_CACHE || SWIOTLB)
314 bool "Support for enabling/disabling CPUs"
315 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
317 Say Y here to be able to disable and re-enable individual
318 CPUs at runtime on SMP machines.
320 Say N if you are unsure.
322 config ARCH_ENABLE_MEMORY_HOTPLUG
325 config ARCH_HAS_WALK_MEMORY
328 config ARCH_ENABLE_MEMORY_HOTREMOVE
332 bool "kexec system call (EXPERIMENTAL)"
333 depends on PPC_BOOK3S && EXPERIMENTAL
335 kexec is a system call that implements the ability to shutdown your
336 current kernel, and to start another kernel. It is like a reboot
337 but it is independent of the system firmware. And like a reboot
338 you can start any kernel with it, not just Linux.
340 The name comes from the similarity to the exec system call.
342 It is an ongoing process to be certain the hardware in a machine
343 is properly shutdown, so do not be surprised if this code does not
344 initially work for you. It may help to enable device hotplugging
345 support. As of this writing the exact hardware interface is
346 strongly in flux, so no good recommendation can be made.
349 bool "Build a kdump crash kernel"
350 depends on PPC64 || 6xx
351 select RELOCATABLE if PPC64
353 Build a kernel suitable for use as a kdump capture kernel.
354 The same kernel binary can be used as production kernel and dump
358 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
359 depends on PPC_PSERIES && EXPERIMENTAL
361 Hypervisor-assisted dump is meant to be a kdump replacement
362 offering robustness and speed not possible without system
363 hypervisor assistance.
368 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
369 default y if PPC_PREP
372 bool "Distribute interrupts on all CPUs by default"
373 depends on SMP && !MV64360
375 This option gives the kernel permission to distribute IRQs across
376 multiple CPUs. Saying N here will route all IRQs to the first
377 CPU. Generally saying Y is safe, although some problems have been
378 reported with SMP Power Macintoshes with this option enabled.
383 default y if SMP && PPC_PSERIES
388 depends on NEED_MULTIPLE_NODES
390 config ARCH_SELECT_MEMORY_MODEL
394 config ARCH_FLATMEM_ENABLE
396 depends on (PPC64 && !NUMA) || PPC32
398 config ARCH_SPARSEMEM_ENABLE
401 select SPARSEMEM_VMEMMAP_ENABLE
403 config ARCH_SPARSEMEM_DEFAULT
405 depends on (SMP && PPC_PSERIES) || PPC_PS3
407 config ARCH_POPULATES_NODE_MAP
412 config ARCH_MEMORY_PROBE
414 depends on MEMORY_HOTPLUG
416 # Some NUMA nodes have memory ranges that span
417 # other nodes. Even though a pfn is valid and
418 # between a node's start and end pfns, it may not
419 # reside on that node. See memmap_init_zone()
421 config NODES_SPAN_OTHER_NODES
423 depends on NEED_MULTIPLE_NODES
425 config PPC_HAS_HASH_64K
431 bool "Using standard binutils settings"
435 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
436 Note, that kernel will be able to run only those applications,
437 which had been compiled using binutils later than 2.17.50.0.3 with
438 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
439 the older binutils, you can patch them with a trivial patch, which
440 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
446 Select the kernel logical page size. Increasing the page size
447 will reduce software overhead at each page boundary, allow
448 hardware prefetch mechanisms to be more effective, and allow
449 larger dma transfers increasing IO efficiency and reducing
450 overhead. However the utilization of memory will increase.
451 For example, each cached file will using a multiple of the
452 page size to hold its contents and the difference between the
453 end of file and the end of page is wasted.
455 Some dedicated systems, such as software raid serving with
456 accelerated calculations, have shown significant increases.
458 If you configure a 64 bit kernel for 64k pages but the
459 processor does not support them, then the kernel will simulate
460 them with 4k pages, loading them on demand, but with the
461 reduced software overhead and larger internal fragmentation.
462 For the 32 bit kernel, a large page option will not be offered
463 unless it is supported by the configured processor.
465 If unsure, choose 4K_PAGES.
471 bool "16k page size" if 44x
474 bool "64k page size" if 44x || PPC_STD_MMU_64
475 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
477 config PPC_256K_PAGES
478 bool "256k page size" if 44x
479 depends on !STDBINUTILS
481 Make the page size 256k.
483 As the ELF standard only requires alignment to support page
484 sizes up to 64k, you will need to compile all of your user
485 space applications with a non-standard binutils settings
486 (see the STDBINUTILS description for details).
488 Say N unless you know what you are doing.
492 config FORCE_MAX_ZONEORDER
493 int "Maximum zone order"
494 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
495 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
496 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
497 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
498 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
499 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
500 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
501 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
502 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
503 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
507 The kernel memory allocator divides physically contiguous memory
508 blocks into "zones", where each zone is a power of two number of
509 pages. This option selects the largest power of two that the kernel
510 keeps in the memory allocator. If you need to allocate very large
511 blocks of physically contiguous memory, then you may need to
514 This config option is actually maximum order plus one. For example,
515 a value of 11 means that the largest free memory block is 2^10 pages.
517 The page size is not necessarily 4KB. For example, on 64-bit
518 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
519 this in mind when choosing a value for this option.
521 config PPC_SUBPAGE_PROT
522 bool "Support setting protections for 4k subpages"
523 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
525 This option adds support for a system call to allow user programs
526 to set access permissions (read/write, readonly, or no access)
527 on the 4k subpages of each 64k page.
530 bool "SMT (Hyperthreading) scheduler support"
531 depends on PPC64 && SMP
533 SMT scheduler support improves the CPU scheduler's decision making
534 when dealing with POWER5 cpus at a cost of slightly increased
535 overhead in some places. If unsure say N here.
537 config PROC_DEVICETREE
538 bool "Support for device tree in /proc"
541 This option adds a device-tree directory under /proc which contains
542 an image of the device tree that the kernel copies from Open
543 Firmware or other boot firmware. If unsure, say Y here.
546 bool "Default bootloader kernel arguments"
549 string "Initial kernel command string"
550 depends on CMDLINE_BOOL
551 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
553 On some platforms, there is currently no way for the boot loader to
554 pass arguments to the kernel. For these platforms, you can supply
555 some command-line options at build time by entering them here. In
556 most cases you will need to specify the root device here.
559 string "Additional default image types"
561 List additional targets to be built by the bootwrapper here (separated
562 by spaces). This is useful for targets that depend of device tree
563 files in the .dts directory.
565 Targets in this list will be build as part of the default build
566 target, or when the user does a 'make zImage' or a
567 'make zImage.initrd'.
569 If unsure, leave blank
572 config ARCH_WANTS_FREEZER_CONTROL
576 source kernel/power/Kconfig
580 bool "Enable seccomp to safely compute untrusted bytecode"
584 This kernel feature is useful for number crunching applications
585 that may need to compute untrusted bytecode during their
586 execution. By using pipes or other transports made available to
587 the process as file descriptors supporting the read/write
588 syscalls, it's possible to isolate those applications in
589 their own address space using seccomp. Once seccomp is
590 enabled via /proc/<pid>/seccomp, it cannot be disabled
591 and the task is only allowed to execute a few safe syscalls
592 defined by each seccomp mode.
594 If unsure, say Y. Only embedded should say N here.
600 default !PPC_ISERIES || PCI
605 bool "Support for ISA-bus hardware"
606 depends on PPC_PREP || PPC_CHRP
609 Find out whether you have ISA slots on your motherboard. ISA is the
610 name of a bus system, i.e. the way the CPU talks to the other stuff
611 inside your box. If you have an Apple machine, say N here; if you
612 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
613 you have an embedded board, consult your board documentation.
619 config GENERIC_ISA_DMA
621 depends on PPC64 || POWER4 || 6xx && !CPM2
624 config PPC_INDIRECT_PCI
627 default y if 40x || 44x
641 select PPC_INDIRECT_PCI
650 Freescale Localbus support
654 depends on PPC_83xx || QUICC_ENGINE || CPM2
656 Freescale General-purpose Timers support
658 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
662 # Platforms that what PCI turned unconditionally just do select PCI
663 # in their config node. Platforms that want to choose at config
664 # time should select PPC_PCI_CHOICE
665 config PPC_PCI_CHOICE
669 bool "PCI support" if PPC_PCI_CHOICE
670 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
671 && !PPC_85xx && !PPC_86xx
672 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
673 default PCI_QSPAN if !4xx && !CPM2 && 8xx
674 select ARCH_SUPPORTS_MSI
676 Find out whether your system includes a PCI bus. PCI is the name of
677 a bus system, i.e. the way the CPU talks to the other stuff inside
678 your box. If you say Y here, the kernel will include drivers and
679 infrastructure code to support PCI bus devices.
689 depends on !4xx && !CPM2 && 8xx
692 Say Y here if you have a system based on a Motorola 8xx-series
693 embedded processor with a QSPAN PCI interface, otherwise say N.
697 depends on PCI && 8260
698 select PPC_INDIRECT_PCI
702 bool "Enable workaround for MPC826x erratum PCI 9"
703 depends on PCI_8260 && !8272
707 prompt "IDMA channel for PCI 9 workaround"
710 config 8260_PCI9_IDMA1
713 config 8260_PCI9_IDMA2
716 config 8260_PCI9_IDMA3
719 config 8260_PCI9_IDMA4
724 source "drivers/pci/pcie/Kconfig"
726 source "drivers/pci/Kconfig"
728 source "drivers/pcmcia/Kconfig"
730 source "drivers/pci/hotplug/Kconfig"
737 bool "RapidIO support"
738 depends on HAS_RAPIDIO
740 If you say Y here, the kernel will include drivers and
741 infrastructure code to support RapidIO interconnect devices.
743 source "drivers/rapidio/Kconfig"
747 menu "Advanced setup"
750 config ADVANCED_OPTIONS
751 bool "Prompt for advanced kernel configuration options"
753 This option will enable prompting for a variety of advanced kernel
754 configuration options. These options can cause the kernel to not
755 work if they are set incorrectly, but can be used to optimize certain
756 aspects of kernel memory management.
758 Unless you know what you are doing, say N here.
760 comment "Default settings for advanced configuration options are used"
761 depends on !ADVANCED_OPTIONS
763 config LOWMEM_SIZE_BOOL
764 bool "Set maximum low memory"
765 depends on ADVANCED_OPTIONS
767 This option allows you to set the maximum amount of memory which
768 will be used as "low memory", that is, memory which the kernel can
769 access directly, without having to set up a kernel virtual mapping.
770 This can be useful in optimizing the layout of kernel virtual
773 Say N here unless you know what you are doing.
776 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
779 config LOWMEM_CAM_NUM_BOOL
780 bool "Set number of CAMs to use to map low memory"
781 depends on ADVANCED_OPTIONS && FSL_BOOKE
783 This option allows you to set the maximum number of CAM slots that
784 will be used to map low memory. There are a limited number of slots
785 available and even more limited number that will fit in the L1 MMU.
786 However, using more entries will allow mapping more low memory. This
787 can be useful in optimizing the layout of kernel virtual memory.
789 Say N here unless you know what you are doing.
791 config LOWMEM_CAM_NUM
793 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
797 bool "Build a relocatable kernel (EXPERIMENTAL)"
798 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
800 This builds a kernel image that is capable of running at the
801 location the kernel is loaded at (some alignment restrictions may
804 One use is for the kexec on panic case where the recovery kernel
805 must live at a different physical address than the primary
808 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
809 it has been loaded at and the compile time physical addresses
810 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
811 setting can still be useful to bootwrappers that need to know the
812 load location of the kernel (eg. u-boot/mkimage).
814 config PAGE_OFFSET_BOOL
815 bool "Set custom page offset address"
816 depends on ADVANCED_OPTIONS
818 This option allows you to set the kernel virtual address at which
819 the kernel will map low memory. This can be useful in optimizing
820 the virtual memory layout of the system.
822 Say N here unless you know what you are doing.
825 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
828 config KERNEL_START_BOOL
829 bool "Set custom kernel base address"
830 depends on ADVANCED_OPTIONS
832 This option allows you to set the kernel virtual address at which
833 the kernel will be loaded. Normally this should match PAGE_OFFSET
834 however there are times (like kdump) that one might not want them
837 Say N here unless you know what you are doing.
840 hex "Virtual address of kernel base" if KERNEL_START_BOOL
841 default PAGE_OFFSET if PAGE_OFFSET_BOOL
842 default "0xc2000000" if CRASH_DUMP
845 config PHYSICAL_START_BOOL
846 bool "Set physical address where the kernel is loaded"
847 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
849 This gives the physical address where the kernel is loaded.
851 Say N here unless you know what you are doing.
853 config PHYSICAL_START
854 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
855 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
858 config PHYSICAL_ALIGN
860 default "0x04000000" if FSL_BOOKE
862 This value puts the alignment restrictions on physical address
863 where kernel is loaded and run from. Kernel is compiled for an
864 address which meets above alignment restriction.
866 config TASK_SIZE_BOOL
867 bool "Set custom user task size"
868 depends on ADVANCED_OPTIONS
870 This option allows you to set the amount of virtual address space
871 allocated to user tasks. This can be useful in optimizing the
872 virtual memory layout of the system.
874 Say N here unless you know what you are doing.
877 hex "Size of user task space" if TASK_SIZE_BOOL
878 default "0x80000000" if PPC_PREP || PPC_8xx
881 config CONSISTENT_SIZE_BOOL
882 bool "Set custom consistent memory pool size"
883 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
885 This option allows you to set the size of the
886 consistent memory pool. This pool of virtual memory
887 is used to make consistent memory allocations.
889 config CONSISTENT_SIZE
890 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
891 default "0x00200000" if NOT_COHERENT_CACHE
894 bool "Pinned Kernel TLBs (860 ONLY)"
895 depends on ADVANCED_OPTIONS && 8xx
900 bool "Build a relocatable kernel"
902 This builds a kernel image that is capable of running anywhere
903 in the RMA (real memory area) at any 16k-aligned base address.
904 The kernel is linked as a position-independent executable (PIE)
905 and contains dynamic relocations which are processed early
906 in the bootup process.
908 One use is for the kexec on panic case where the recovery kernel
909 must live at a different physical address than the primary
914 default "0xc000000000000000"
917 default "0xc000000000000000"
918 config PHYSICAL_START
925 source "drivers/Kconfig"
929 source "arch/powerpc/sysdev/qe_lib/Kconfig"
933 source "arch/powerpc/Kconfig.debug"
935 source "security/Kconfig"
939 depends on COMPAT && KEYS
942 source "crypto/Kconfig"
952 source "arch/powerpc/kvm/Kconfig"