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
52 config NEED_PER_CPU_EMBED_FIRST_CHUNK
60 int "Number of virtual interrupt numbers"
64 This defines the number of virtual interrupt numbers the kernel
65 can manage. Virtual interrupt numbers are what you see in
66 /proc/interrupts. If you configure your system to have too few,
67 drivers will fail to load or worse - handle with care.
69 config STACKTRACE_SUPPORT
73 config HAVE_LATENCYTOP_SUPPORT
76 config TRACE_IRQFLAGS_SUPPORT
80 config LOCKDEP_SUPPORT
84 config RWSEM_GENERIC_SPINLOCK
87 config RWSEM_XCHGADD_ALGORITHM
91 config GENERIC_LOCKBREAK
94 depends on SMP && PREEMPT
96 config ARCH_HAS_ILOG2_U32
100 config ARCH_HAS_ILOG2_U64
104 config GENERIC_HWEIGHT
108 config GENERIC_FIND_NEXT_BIT
115 Generic GPIO API support
117 config ARCH_NO_VIRT_TO_BUS
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_DYNAMIC_FTRACE
125 select HAVE_FUNCTION_TRACER
126 select HAVE_FUNCTION_GRAPH_TRACER
127 select ARCH_WANT_OPTIONAL_GPIOLIB
129 select HAVE_IOREMAP_PROT
130 select HAVE_EFFICIENT_UNALIGNED_ACCESS
132 select HAVE_ARCH_KGDB
133 select HAVE_KRETPROBES
134 select HAVE_ARCH_TRACEHOOK
136 select HAVE_DMA_ATTRS
137 select HAVE_DMA_API_DEBUG
138 select USE_GENERIC_SMP_HELPERS if SMP
140 select HAVE_SYSCALL_WRAPPERS if PPC64
141 select GENERIC_ATOMIC64 if PPC32
142 select HAVE_PERF_EVENTS
151 select COMPAT_BINFMT_ELF
153 config SYSVIPC_COMPAT
155 depends on COMPAT && SYSVIPC
158 # All PPC32s use generic nvram driver through ppc_md
163 config SCHED_OMIT_FRAME_POINTER
167 config ARCH_MAY_HAVE_PC_FDC
169 default !PPC_PSERIES || PCI
177 config PPC_UDBG_16550
181 config GENERIC_TBSYNC
183 default y if PPC32 && SMP
195 config SYS_SUPPORTS_APM_EMULATION
196 default y if PMAC_APM_EMU
203 config DEFAULT_UIMAGE
206 Used to allow a board to specify it wants a uImage built by default
212 config ARCH_HIBERNATION_POSSIBLE
216 config ARCH_SUSPEND_POSSIBLE
218 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
221 config PPC_DCR_NATIVE
231 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
234 config PPC_OF_PLATFORM_PCI
237 depends on PPC64 # not supported on 32 bits yet
240 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
243 source "init/Kconfig"
245 source "kernel/Kconfig.freezer"
247 source "arch/powerpc/sysdev/Kconfig"
248 source "arch/powerpc/platforms/Kconfig"
250 menu "Kernel options"
253 bool "High memory support"
256 source kernel/time/Kconfig
257 source kernel/Kconfig.hz
258 source kernel/Kconfig.preempt
259 source "fs/Kconfig.binfmt"
261 config HUGETLB_PAGE_SIZE_VARIABLE
263 depends on HUGETLB_PAGE
266 config MATH_EMULATION
267 bool "Math emulation"
268 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
270 Some PowerPC chips designed for embedded applications do not have
271 a floating-point unit and therefore do not implement the
272 floating-point instructions in the PowerPC instruction set. If you
273 say Y here, the kernel will include code to emulate a floating-point
274 unit, which will allow programs that use floating-point
277 config 8XX_MINIMAL_FPEMU
278 bool "Minimal math emulation for 8xx"
279 depends on 8xx && !MATH_EMULATION
281 Older arch/ppc kernels still emulated a few floating point
282 instructions such as load and store, even when full math
283 emulation is disabled. Say "Y" here if you want to preserve
286 It is recommended that you build a soft-float userspace instead.
289 bool "Enable IOMMU virtual merging"
293 Cause IO segments sent to a device for DMA to be merged virtually
294 by the IOMMU when they happen to have been allocated contiguously.
295 This doesn't add pressure to the IOMMU allocator. However, some
296 drivers don't support getting large merged segments coming back
299 Most drivers don't have this problem; it is safe to say Y here.
305 bool "SWIOTLB support"
309 Support for IO bounce buffering for systems without an IOMMU.
310 This allows us to DMA to the full physical address space on
311 platforms where the size of a physical address is larger
312 than the bus address. Not all platforms support this.
315 bool "Support for enabling/disabling CPUs"
316 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
318 Say Y here to be able to disable and re-enable individual
319 CPUs at runtime on SMP machines.
321 Say N if you are unsure.
323 config ARCH_CPU_PROBE_RELEASE
325 depends on HOTPLUG_CPU
327 config ARCH_ENABLE_MEMORY_HOTPLUG
330 config ARCH_HAS_WALK_MEMORY
333 config ARCH_ENABLE_MEMORY_HOTREMOVE
337 bool "kexec system call (EXPERIMENTAL)"
338 depends on PPC_BOOK3S && EXPERIMENTAL
340 kexec is a system call that implements the ability to shutdown your
341 current kernel, and to start another kernel. It is like a reboot
342 but it is independent of the system firmware. And like a reboot
343 you can start any kernel with it, not just Linux.
345 The name comes from the similarity to the exec system call.
347 It is an ongoing process to be certain the hardware in a machine
348 is properly shutdown, so do not be surprised if this code does not
349 initially work for you. It may help to enable device hotplugging
350 support. As of this writing the exact hardware interface is
351 strongly in flux, so no good recommendation can be made.
354 bool "Build a kdump crash kernel"
355 depends on PPC64 || 6xx
356 select RELOCATABLE if PPC64
358 Build a kernel suitable for use as a kdump capture kernel.
359 The same kernel binary can be used as production kernel and dump
363 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
364 depends on PPC_PSERIES && EXPERIMENTAL
366 Hypervisor-assisted dump is meant to be a kdump replacement
367 offering robustness and speed not possible without system
368 hypervisor assistance.
373 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
374 default y if PPC_PREP
377 bool "Distribute interrupts on all CPUs by default"
378 depends on SMP && !MV64360
380 This option gives the kernel permission to distribute IRQs across
381 multiple CPUs. Saying N here will route all IRQs to the first
382 CPU. Generally saying Y is safe, although some problems have been
383 reported with SMP Power Macintoshes with this option enabled.
386 bool "Support sparse irq numbering"
389 This enables support for sparse irqs. This is useful for distro
390 kernels that want to define a high CONFIG_NR_CPUS value but still
391 want to have low kernel memory footprint on smaller machines.
393 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
394 out the irq_desc[] array in a more NUMA-friendly way. )
396 If you don't know what to do here, say Y.
401 default y if SMP && PPC_PSERIES
407 depends on NEED_MULTIPLE_NODES
409 config MAX_ACTIVE_REGIONS
411 default "256" if PPC64
414 config ARCH_SELECT_MEMORY_MODEL
418 config ARCH_FLATMEM_ENABLE
420 depends on (PPC64 && !NUMA) || PPC32
422 config ARCH_SPARSEMEM_ENABLE
425 select SPARSEMEM_VMEMMAP_ENABLE
427 config ARCH_SPARSEMEM_DEFAULT
429 depends on (SMP && PPC_PSERIES) || PPC_PS3
431 config ARCH_POPULATES_NODE_MAP
434 config SYS_SUPPORTS_HUGETLBFS
436 depends on PPC_BOOK3S_64
440 config ARCH_MEMORY_PROBE
442 depends on MEMORY_HOTPLUG
444 # Some NUMA nodes have memory ranges that span
445 # other nodes. Even though a pfn is valid and
446 # between a node's start and end pfns, it may not
447 # reside on that node. See memmap_init_zone()
449 config NODES_SPAN_OTHER_NODES
451 depends on NEED_MULTIPLE_NODES
453 config PPC_HAS_HASH_64K
459 bool "Using standard binutils settings"
463 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
464 Note, that kernel will be able to run only those applications,
465 which had been compiled using binutils later than 2.17.50.0.3 with
466 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
467 the older binutils, you can patch them with a trivial patch, which
468 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
474 Select the kernel logical page size. Increasing the page size
475 will reduce software overhead at each page boundary, allow
476 hardware prefetch mechanisms to be more effective, and allow
477 larger dma transfers increasing IO efficiency and reducing
478 overhead. However the utilization of memory will increase.
479 For example, each cached file will using a multiple of the
480 page size to hold its contents and the difference between the
481 end of file and the end of page is wasted.
483 Some dedicated systems, such as software raid serving with
484 accelerated calculations, have shown significant increases.
486 If you configure a 64 bit kernel for 64k pages but the
487 processor does not support them, then the kernel will simulate
488 them with 4k pages, loading them on demand, but with the
489 reduced software overhead and larger internal fragmentation.
490 For the 32 bit kernel, a large page option will not be offered
491 unless it is supported by the configured processor.
493 If unsure, choose 4K_PAGES.
499 bool "16k page size" if 44x
502 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
503 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
505 config PPC_256K_PAGES
506 bool "256k page size" if 44x
507 depends on !STDBINUTILS
509 Make the page size 256k.
511 As the ELF standard only requires alignment to support page
512 sizes up to 64k, you will need to compile all of your user
513 space applications with a non-standard binutils settings
514 (see the STDBINUTILS description for details).
516 Say N unless you know what you are doing.
520 config FORCE_MAX_ZONEORDER
521 int "Maximum zone order"
522 range 9 64 if PPC64 && PPC_64K_PAGES
523 default "9" if PPC64 && PPC_64K_PAGES
524 range 13 64 if PPC64 && !PPC_64K_PAGES
525 default "13" if PPC64 && !PPC_64K_PAGES
526 range 9 64 if PPC32 && PPC_16K_PAGES
527 default "9" if PPC32 && PPC_16K_PAGES
528 range 7 64 if PPC32 && PPC_64K_PAGES
529 default "7" if PPC32 && PPC_64K_PAGES
530 range 5 64 if PPC32 && PPC_256K_PAGES
531 default "5" if PPC32 && PPC_256K_PAGES
535 The kernel memory allocator divides physically contiguous memory
536 blocks into "zones", where each zone is a power of two number of
537 pages. This option selects the largest power of two that the kernel
538 keeps in the memory allocator. If you need to allocate very large
539 blocks of physically contiguous memory, then you may need to
542 This config option is actually maximum order plus one. For example,
543 a value of 11 means that the largest free memory block is 2^10 pages.
545 The page size is not necessarily 4KB. For example, on 64-bit
546 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
547 this in mind when choosing a value for this option.
549 config PPC_SUBPAGE_PROT
550 bool "Support setting protections for 4k subpages"
551 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
553 This option adds support for a system call to allow user programs
554 to set access permissions (read/write, readonly, or no access)
555 on the 4k subpages of each 64k page.
558 bool "SMT (Hyperthreading) scheduler support"
559 depends on PPC64 && SMP
561 SMT scheduler support improves the CPU scheduler's decision making
562 when dealing with POWER5 cpus at a cost of slightly increased
563 overhead in some places. If unsure say N here.
565 config PROC_DEVICETREE
566 bool "Support for device tree in /proc"
569 This option adds a device-tree directory under /proc which contains
570 an image of the device tree that the kernel copies from Open
571 Firmware or other boot firmware. If unsure, say Y here.
574 bool "Default bootloader kernel arguments"
577 string "Initial kernel command string"
578 depends on CMDLINE_BOOL
579 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
581 On some platforms, there is currently no way for the boot loader to
582 pass arguments to the kernel. For these platforms, you can supply
583 some command-line options at build time by entering them here. In
584 most cases you will need to specify the root device here.
587 string "Additional default image types"
589 List additional targets to be built by the bootwrapper here (separated
590 by spaces). This is useful for targets that depend of device tree
591 files in the .dts directory.
593 Targets in this list will be build as part of the default build
594 target, or when the user does a 'make zImage' or a
595 'make zImage.initrd'.
597 If unsure, leave blank
600 config ARCH_WANTS_FREEZER_CONTROL
604 source kernel/power/Kconfig
608 bool "Enable seccomp to safely compute untrusted bytecode"
612 This kernel feature is useful for number crunching applications
613 that may need to compute untrusted bytecode during their
614 execution. By using pipes or other transports made available to
615 the process as file descriptors supporting the read/write
616 syscalls, it's possible to isolate those applications in
617 their own address space using seccomp. Once seccomp is
618 enabled via /proc/<pid>/seccomp, it cannot be disabled
619 and the task is only allowed to execute a few safe syscalls
620 defined by each seccomp mode.
622 If unsure, say Y. Only embedded should say N here.
628 default !PPC_ISERIES || PCI
633 bool "Support for ISA-bus hardware"
634 depends on PPC_PREP || PPC_CHRP
637 Find out whether you have ISA slots on your motherboard. ISA is the
638 name of a bus system, i.e. the way the CPU talks to the other stuff
639 inside your box. If you have an Apple machine, say N here; if you
640 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
641 you have an embedded board, consult your board documentation.
647 config GENERIC_ISA_DMA
649 depends on PPC64 || POWER4 || 6xx && !CPM2
652 config PPC_INDIRECT_PCI
655 default y if 40x || 44x
669 select PPC_INDIRECT_PCI
675 depends on SUSPEND && (PPC_85xx || PPC_86xx)
677 Freescale MPC85xx/MPC86xx power management controller support
678 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
686 Freescale Localbus support
690 depends on PPC_83xx || QUICC_ENGINE || CPM2
692 Freescale General-purpose Timers support
694 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
698 # Platforms that what PCI turned unconditionally just do select PCI
699 # in their config node. Platforms that want to choose at config
700 # time should select PPC_PCI_CHOICE
701 config PPC_PCI_CHOICE
705 bool "PCI support" if PPC_PCI_CHOICE
706 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
707 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
708 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
709 default PCI_QSPAN if !4xx && !CPM2 && 8xx
710 select ARCH_SUPPORTS_MSI
712 Find out whether your system includes a PCI bus. PCI is the name of
713 a bus system, i.e. the way the CPU talks to the other stuff inside
714 your box. If you say Y here, the kernel will include drivers and
715 infrastructure code to support PCI bus devices.
725 depends on !4xx && !CPM2 && 8xx
728 Say Y here if you have a system based on a Motorola 8xx-series
729 embedded processor with a QSPAN PCI interface, otherwise say N.
733 depends on PCI && 8260
734 select PPC_INDIRECT_PCI
738 bool "Enable workaround for MPC826x erratum PCI 9"
739 depends on PCI_8260 && !8272
743 prompt "IDMA channel for PCI 9 workaround"
746 config 8260_PCI9_IDMA1
749 config 8260_PCI9_IDMA2
752 config 8260_PCI9_IDMA3
755 config 8260_PCI9_IDMA4
760 source "drivers/pci/pcie/Kconfig"
762 source "drivers/pci/Kconfig"
764 source "drivers/pcmcia/Kconfig"
766 source "drivers/pci/hotplug/Kconfig"
773 bool "RapidIO support"
774 depends on HAS_RAPIDIO
776 If you say Y here, the kernel will include drivers and
777 infrastructure code to support RapidIO interconnect devices.
779 source "drivers/rapidio/Kconfig"
783 menu "Advanced setup"
786 config ADVANCED_OPTIONS
787 bool "Prompt for advanced kernel configuration options"
789 This option will enable prompting for a variety of advanced kernel
790 configuration options. These options can cause the kernel to not
791 work if they are set incorrectly, but can be used to optimize certain
792 aspects of kernel memory management.
794 Unless you know what you are doing, say N here.
796 comment "Default settings for advanced configuration options are used"
797 depends on !ADVANCED_OPTIONS
799 config LOWMEM_SIZE_BOOL
800 bool "Set maximum low memory"
801 depends on ADVANCED_OPTIONS
803 This option allows you to set the maximum amount of memory which
804 will be used as "low memory", that is, memory which the kernel can
805 access directly, without having to set up a kernel virtual mapping.
806 This can be useful in optimizing the layout of kernel virtual
809 Say N here unless you know what you are doing.
812 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
815 config LOWMEM_CAM_NUM_BOOL
816 bool "Set number of CAMs to use to map low memory"
817 depends on ADVANCED_OPTIONS && FSL_BOOKE
819 This option allows you to set the maximum number of CAM slots that
820 will be used to map low memory. There are a limited number of slots
821 available and even more limited number that will fit in the L1 MMU.
822 However, using more entries will allow mapping more low memory. This
823 can be useful in optimizing the layout of kernel virtual memory.
825 Say N here unless you know what you are doing.
827 config LOWMEM_CAM_NUM
829 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
833 bool "Build a relocatable kernel (EXPERIMENTAL)"
834 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
836 This builds a kernel image that is capable of running at the
837 location the kernel is loaded at (some alignment restrictions may
840 One use is for the kexec on panic case where the recovery kernel
841 must live at a different physical address than the primary
844 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
845 it has been loaded at and the compile time physical addresses
846 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
847 setting can still be useful to bootwrappers that need to know the
848 load location of the kernel (eg. u-boot/mkimage).
850 config PAGE_OFFSET_BOOL
851 bool "Set custom page offset address"
852 depends on ADVANCED_OPTIONS
854 This option allows you to set the kernel virtual address at which
855 the kernel will map low memory. This can be useful in optimizing
856 the virtual memory layout of the system.
858 Say N here unless you know what you are doing.
861 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
864 config KERNEL_START_BOOL
865 bool "Set custom kernel base address"
866 depends on ADVANCED_OPTIONS
868 This option allows you to set the kernel virtual address at which
869 the kernel will be loaded. Normally this should match PAGE_OFFSET
870 however there are times (like kdump) that one might not want them
873 Say N here unless you know what you are doing.
876 hex "Virtual address of kernel base" if KERNEL_START_BOOL
877 default PAGE_OFFSET if PAGE_OFFSET_BOOL
878 default "0xc2000000" if CRASH_DUMP
881 config PHYSICAL_START_BOOL
882 bool "Set physical address where the kernel is loaded"
883 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
885 This gives the physical address where the kernel is loaded.
887 Say N here unless you know what you are doing.
889 config PHYSICAL_START
890 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
891 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
894 config PHYSICAL_ALIGN
896 default "0x04000000" if FSL_BOOKE
898 This value puts the alignment restrictions on physical address
899 where kernel is loaded and run from. Kernel is compiled for an
900 address which meets above alignment restriction.
902 config TASK_SIZE_BOOL
903 bool "Set custom user task size"
904 depends on ADVANCED_OPTIONS
906 This option allows you to set the amount of virtual address space
907 allocated to user tasks. This can be useful in optimizing the
908 virtual memory layout of the system.
910 Say N here unless you know what you are doing.
913 hex "Size of user task space" if TASK_SIZE_BOOL
914 default "0x80000000" if PPC_PREP || PPC_8xx
917 config CONSISTENT_SIZE_BOOL
918 bool "Set custom consistent memory pool size"
919 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
921 This option allows you to set the size of the
922 consistent memory pool. This pool of virtual memory
923 is used to make consistent memory allocations.
925 config CONSISTENT_SIZE
926 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
927 default "0x00200000" if NOT_COHERENT_CACHE
930 bool "Pinned Kernel TLBs (860 ONLY)"
931 depends on ADVANCED_OPTIONS && 8xx
936 bool "Build a relocatable kernel"
938 This builds a kernel image that is capable of running anywhere
939 in the RMA (real memory area) at any 16k-aligned base address.
940 The kernel is linked as a position-independent executable (PIE)
941 and contains dynamic relocations which are processed early
942 in the bootup process.
944 One use is for the kexec on panic case where the recovery kernel
945 must live at a different physical address than the primary
950 default "0xc000000000000000"
953 default "0xc000000000000000"
954 config PHYSICAL_START
961 source "drivers/Kconfig"
965 source "arch/powerpc/sysdev/qe_lib/Kconfig"
969 source "arch/powerpc/Kconfig.debug"
971 source "security/Kconfig"
975 depends on COMPAT && KEYS
978 source "crypto/Kconfig"
988 source "arch/powerpc/kvm/Kconfig"