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
67 config LOCKDEP_SUPPORT
71 config RWSEM_GENERIC_SPINLOCK
74 config RWSEM_XCHGADD_ALGORITHM
78 config GENERIC_LOCKBREAK
81 depends on SMP && PREEMPT
83 config ARCH_HAS_ILOG2_U32
87 config ARCH_HAS_ILOG2_U64
91 config GENERIC_HWEIGHT
95 config GENERIC_FIND_NEXT_BIT
102 Generic GPIO API support
104 config ARCH_NO_VIRT_TO_BUS
110 select HAVE_FTRACE_MCOUNT_RECORD
111 select HAVE_DYNAMIC_FTRACE
112 select HAVE_FUNCTION_TRACER
113 select HAVE_FUNCTION_GRAPH_TRACER
114 select ARCH_WANT_OPTIONAL_GPIOLIB
116 select HAVE_IOREMAP_PROT
117 select HAVE_EFFICIENT_UNALIGNED_ACCESS
119 select HAVE_ARCH_KGDB
120 select HAVE_KRETPROBES
121 select HAVE_ARCH_TRACEHOOK
123 select HAVE_DMA_ATTRS if PPC64
124 select USE_GENERIC_SMP_HELPERS if SMP
126 select HAVE_SYSCALL_WRAPPERS if PPC64
127 select GENERIC_ATOMIC64 if PPC32
128 select HAVE_PERF_COUNTERS
137 select COMPAT_BINFMT_ELF
139 config SYSVIPC_COMPAT
141 depends on COMPAT && SYSVIPC
144 # All PPC32s use generic nvram driver through ppc_md
149 config SCHED_OMIT_FRAME_POINTER
153 config ARCH_MAY_HAVE_PC_FDC
155 default !PPC_PSERIES || PCI
163 config PPC_UDBG_16550
167 config GENERIC_TBSYNC
169 default y if PPC32 && SMP
181 config SYS_SUPPORTS_APM_EMULATION
182 default y if PMAC_APM_EMU
189 config DEFAULT_UIMAGE
192 Used to allow a board to specify it wants a uImage built by default
200 depends on (PPC_PMAC && !SMP) || BROKEN
205 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
208 config ARCH_HIBERNATION_POSSIBLE
210 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
213 config ARCH_SUSPEND_POSSIBLE
215 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
217 config PPC_DCR_NATIVE
227 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
230 config PPC_OF_PLATFORM_PCI
233 depends on PPC64 # not supported on 32 bits yet
236 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
239 source "init/Kconfig"
241 source "kernel/Kconfig.freezer"
243 source "arch/powerpc/sysdev/Kconfig"
244 source "arch/powerpc/platforms/Kconfig"
246 menu "Kernel options"
249 bool "High memory support"
252 source kernel/time/Kconfig
253 source kernel/Kconfig.hz
254 source kernel/Kconfig.preempt
255 source "fs/Kconfig.binfmt"
257 config HUGETLB_PAGE_SIZE_VARIABLE
259 depends on HUGETLB_PAGE
262 config MATH_EMULATION
263 bool "Math emulation"
264 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
266 Some PowerPC chips designed for embedded applications do not have
267 a floating-point unit and therefore do not implement the
268 floating-point instructions in the PowerPC instruction set. If you
269 say Y here, the kernel will include code to emulate a floating-point
270 unit, which will allow programs that use floating-point
273 config 8XX_MINIMAL_FPEMU
274 bool "Minimal math emulation for 8xx"
275 depends on 8xx && !MATH_EMULATION
277 Older arch/ppc kernels still emulated a few floating point
278 instructions such as load and store, even when full math
279 emulation is disabled. Say "Y" here if you want to preserve
282 It is recommended that you build a soft-float userspace instead.
285 bool "Enable IOMMU virtual merging"
289 Cause IO segments sent to a device for DMA to be merged virtually
290 by the IOMMU when they happen to have been allocated contiguously.
291 This doesn't add pressure to the IOMMU allocator. However, some
292 drivers don't support getting large merged segments coming back
295 Most drivers don't have this problem; it is safe to say Y here.
301 bool "SWIOTLB support"
305 Support for IO bounce buffering for systems without an IOMMU.
306 This allows us to DMA to the full physical address space on
307 platforms where the size of a physical address is larger
308 than the bus address. Not all platforms support this.
310 config PPC_NEED_DMA_SYNC_OPS
312 depends on (NOT_COHERENT_CACHE || SWIOTLB)
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_ENABLE_MEMORY_HOTPLUG
326 config ARCH_HAS_WALK_MEMORY
329 config ARCH_ENABLE_MEMORY_HOTREMOVE
333 bool "kexec system call (EXPERIMENTAL)"
334 depends on PPC_BOOK3S && EXPERIMENTAL
336 kexec is a system call that implements the ability to shutdown your
337 current kernel, and to start another kernel. It is like a reboot
338 but it is independent of the system firmware. And like a reboot
339 you can start any kernel with it, not just Linux.
341 The name comes from the similarity to the exec system call.
343 It is an ongoing process to be certain the hardware in a machine
344 is properly shutdown, so do not be surprised if this code does not
345 initially work for you. It may help to enable device hotplugging
346 support. As of this writing the exact hardware interface is
347 strongly in flux, so no good recommendation can be made.
350 bool "Build a kdump crash kernel"
351 depends on PPC64 || 6xx
352 select RELOCATABLE if PPC64
354 Build a kernel suitable for use as a kdump capture kernel.
355 The same kernel binary can be used as production kernel and dump
359 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
360 depends on PPC_PSERIES && EXPERIMENTAL
362 Hypervisor-assisted dump is meant to be a kdump replacement
363 offering robustness and speed not possible without system
364 hypervisor assistance.
369 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
370 default y if PPC_PREP
373 bool "Distribute interrupts on all CPUs by default"
374 depends on SMP && !MV64360
376 This option gives the kernel permission to distribute IRQs across
377 multiple CPUs. Saying N here will route all IRQs to the first
378 CPU. Generally saying Y is safe, although some problems have been
379 reported with SMP Power Macintoshes with this option enabled.
384 default y if SMP && PPC_PSERIES
389 depends on NEED_MULTIPLE_NODES
391 config ARCH_SELECT_MEMORY_MODEL
395 config ARCH_FLATMEM_ENABLE
397 depends on (PPC64 && !NUMA) || PPC32
399 config ARCH_SPARSEMEM_ENABLE
402 select SPARSEMEM_VMEMMAP_ENABLE
404 config ARCH_SPARSEMEM_DEFAULT
406 depends on (SMP && PPC_PSERIES) || PPC_PS3
408 config ARCH_POPULATES_NODE_MAP
413 config ARCH_MEMORY_PROBE
415 depends on MEMORY_HOTPLUG
417 # Some NUMA nodes have memory ranges that span
418 # other nodes. Even though a pfn is valid and
419 # between a node's start and end pfns, it may not
420 # reside on that node. See memmap_init_zone()
422 config NODES_SPAN_OTHER_NODES
424 depends on NEED_MULTIPLE_NODES
426 config PPC_HAS_HASH_64K
432 bool "Using standard binutils settings"
436 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
437 Note, that kernel will be able to run only those applications,
438 which had been compiled using binutils later than 2.17.50.0.3 with
439 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
440 the older binutils, you can patch them with a trivial patch, which
441 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
447 Select the kernel logical page size. Increasing the page size
448 will reduce software overhead at each page boundary, allow
449 hardware prefetch mechanisms to be more effective, and allow
450 larger dma transfers increasing IO efficiency and reducing
451 overhead. However the utilization of memory will increase.
452 For example, each cached file will using a multiple of the
453 page size to hold its contents and the difference between the
454 end of file and the end of page is wasted.
456 Some dedicated systems, such as software raid serving with
457 accelerated calculations, have shown significant increases.
459 If you configure a 64 bit kernel for 64k pages but the
460 processor does not support them, then the kernel will simulate
461 them with 4k pages, loading them on demand, but with the
462 reduced software overhead and larger internal fragmentation.
463 For the 32 bit kernel, a large page option will not be offered
464 unless it is supported by the configured processor.
466 If unsure, choose 4K_PAGES.
472 bool "16k page size" if 44x
475 bool "64k page size" if 44x || PPC_STD_MMU_64
476 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
478 config PPC_256K_PAGES
479 bool "256k page size" if 44x
480 depends on !STDBINUTILS
482 Make the page size 256k.
484 As the ELF standard only requires alignment to support page
485 sizes up to 64k, you will need to compile all of your user
486 space applications with a non-standard binutils settings
487 (see the STDBINUTILS description for details).
489 Say N unless you know what you are doing.
493 config FORCE_MAX_ZONEORDER
494 int "Maximum zone order"
495 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
496 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
497 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
498 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
499 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
500 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
501 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
502 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
503 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
504 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
508 The kernel memory allocator divides physically contiguous memory
509 blocks into "zones", where each zone is a power of two number of
510 pages. This option selects the largest power of two that the kernel
511 keeps in the memory allocator. If you need to allocate very large
512 blocks of physically contiguous memory, then you may need to
515 This config option is actually maximum order plus one. For example,
516 a value of 11 means that the largest free memory block is 2^10 pages.
518 The page size is not necessarily 4KB. For example, on 64-bit
519 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
520 this in mind when choosing a value for this option.
522 config PPC_SUBPAGE_PROT
523 bool "Support setting protections for 4k subpages"
524 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
526 This option adds support for a system call to allow user programs
527 to set access permissions (read/write, readonly, or no access)
528 on the 4k subpages of each 64k page.
531 bool "SMT (Hyperthreading) scheduler support"
532 depends on PPC64 && SMP
534 SMT scheduler support improves the CPU scheduler's decision making
535 when dealing with POWER5 cpus at a cost of slightly increased
536 overhead in some places. If unsure say N here.
538 config PROC_DEVICETREE
539 bool "Support for device tree in /proc"
542 This option adds a device-tree directory under /proc which contains
543 an image of the device tree that the kernel copies from Open
544 Firmware or other boot firmware. If unsure, say Y here.
547 bool "Default bootloader kernel arguments"
550 string "Initial kernel command string"
551 depends on CMDLINE_BOOL
552 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
554 On some platforms, there is currently no way for the boot loader to
555 pass arguments to the kernel. For these platforms, you can supply
556 some command-line options at build time by entering them here. In
557 most cases you will need to specify the root device here.
560 string "Additional default image types"
562 List additional targets to be built by the bootwrapper here (separated
563 by spaces). This is useful for targets that depend of device tree
564 files in the .dts directory.
566 Targets in this list will be build as part of the default build
567 target, or when the user does a 'make zImage' or a
568 'make zImage.initrd'.
570 If unsure, leave blank
573 config ARCH_WANTS_FREEZER_CONTROL
577 source kernel/power/Kconfig
581 bool "Enable seccomp to safely compute untrusted bytecode"
585 This kernel feature is useful for number crunching applications
586 that may need to compute untrusted bytecode during their
587 execution. By using pipes or other transports made available to
588 the process as file descriptors supporting the read/write
589 syscalls, it's possible to isolate those applications in
590 their own address space using seccomp. Once seccomp is
591 enabled via /proc/<pid>/seccomp, it cannot be disabled
592 and the task is only allowed to execute a few safe syscalls
593 defined by each seccomp mode.
595 If unsure, say Y. Only embedded should say N here.
601 default !PPC_ISERIES || PCI
606 bool "Support for ISA-bus hardware"
607 depends on PPC_PREP || PPC_CHRP
610 Find out whether you have ISA slots on your motherboard. ISA is the
611 name of a bus system, i.e. the way the CPU talks to the other stuff
612 inside your box. If you have an Apple machine, say N here; if you
613 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
614 you have an embedded board, consult your board documentation.
620 config GENERIC_ISA_DMA
622 depends on PPC64 || POWER4 || 6xx && !CPM2
625 config PPC_INDIRECT_PCI
628 default y if 40x || 44x
642 select PPC_INDIRECT_PCI
651 Freescale Localbus support
655 depends on PPC_83xx || QUICC_ENGINE || CPM2
657 Freescale General-purpose Timers support
659 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
663 # Platforms that what PCI turned unconditionally just do select PCI
664 # in their config node. Platforms that want to choose at config
665 # time should select PPC_PCI_CHOICE
666 config PPC_PCI_CHOICE
670 bool "PCI support" if PPC_PCI_CHOICE
671 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
672 && !PPC_85xx && !PPC_86xx
673 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
674 default PCI_QSPAN if !4xx && !CPM2 && 8xx
675 select ARCH_SUPPORTS_MSI
677 Find out whether your system includes a PCI bus. PCI is the name of
678 a bus system, i.e. the way the CPU talks to the other stuff inside
679 your box. If you say Y here, the kernel will include drivers and
680 infrastructure code to support PCI bus devices.
690 depends on !4xx && !CPM2 && 8xx
693 Say Y here if you have a system based on a Motorola 8xx-series
694 embedded processor with a QSPAN PCI interface, otherwise say N.
698 depends on PCI && 8260
699 select PPC_INDIRECT_PCI
703 bool "Enable workaround for MPC826x erratum PCI 9"
704 depends on PCI_8260 && !8272
708 prompt "IDMA channel for PCI 9 workaround"
711 config 8260_PCI9_IDMA1
714 config 8260_PCI9_IDMA2
717 config 8260_PCI9_IDMA3
720 config 8260_PCI9_IDMA4
725 source "drivers/pci/pcie/Kconfig"
727 source "drivers/pci/Kconfig"
729 source "drivers/pcmcia/Kconfig"
731 source "drivers/pci/hotplug/Kconfig"
738 bool "RapidIO support"
739 depends on HAS_RAPIDIO
741 If you say Y here, the kernel will include drivers and
742 infrastructure code to support RapidIO interconnect devices.
744 source "drivers/rapidio/Kconfig"
748 menu "Advanced setup"
751 config ADVANCED_OPTIONS
752 bool "Prompt for advanced kernel configuration options"
754 This option will enable prompting for a variety of advanced kernel
755 configuration options. These options can cause the kernel to not
756 work if they are set incorrectly, but can be used to optimize certain
757 aspects of kernel memory management.
759 Unless you know what you are doing, say N here.
761 comment "Default settings for advanced configuration options are used"
762 depends on !ADVANCED_OPTIONS
764 config LOWMEM_SIZE_BOOL
765 bool "Set maximum low memory"
766 depends on ADVANCED_OPTIONS
768 This option allows you to set the maximum amount of memory which
769 will be used as "low memory", that is, memory which the kernel can
770 access directly, without having to set up a kernel virtual mapping.
771 This can be useful in optimizing the layout of kernel virtual
774 Say N here unless you know what you are doing.
777 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
780 config LOWMEM_CAM_NUM_BOOL
781 bool "Set number of CAMs to use to map low memory"
782 depends on ADVANCED_OPTIONS && FSL_BOOKE
784 This option allows you to set the maximum number of CAM slots that
785 will be used to map low memory. There are a limited number of slots
786 available and even more limited number that will fit in the L1 MMU.
787 However, using more entries will allow mapping more low memory. This
788 can be useful in optimizing the layout of kernel virtual memory.
790 Say N here unless you know what you are doing.
792 config LOWMEM_CAM_NUM
794 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
798 bool "Build a relocatable kernel (EXPERIMENTAL)"
799 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
801 This builds a kernel image that is capable of running at the
802 location the kernel is loaded at (some alignment restrictions may
805 One use is for the kexec on panic case where the recovery kernel
806 must live at a different physical address than the primary
809 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
810 it has been loaded at and the compile time physical addresses
811 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
812 setting can still be useful to bootwrappers that need to know the
813 load location of the kernel (eg. u-boot/mkimage).
815 config PAGE_OFFSET_BOOL
816 bool "Set custom page offset address"
817 depends on ADVANCED_OPTIONS
819 This option allows you to set the kernel virtual address at which
820 the kernel will map low memory. This can be useful in optimizing
821 the virtual memory layout of the system.
823 Say N here unless you know what you are doing.
826 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
829 config KERNEL_START_BOOL
830 bool "Set custom kernel base address"
831 depends on ADVANCED_OPTIONS
833 This option allows you to set the kernel virtual address at which
834 the kernel will be loaded. Normally this should match PAGE_OFFSET
835 however there are times (like kdump) that one might not want them
838 Say N here unless you know what you are doing.
841 hex "Virtual address of kernel base" if KERNEL_START_BOOL
842 default PAGE_OFFSET if PAGE_OFFSET_BOOL
843 default "0xc2000000" if CRASH_DUMP
846 config PHYSICAL_START_BOOL
847 bool "Set physical address where the kernel is loaded"
848 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
850 This gives the physical address where the kernel is loaded.
852 Say N here unless you know what you are doing.
854 config PHYSICAL_START
855 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
856 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
859 config PHYSICAL_ALIGN
861 default "0x04000000" if FSL_BOOKE
863 This value puts the alignment restrictions on physical address
864 where kernel is loaded and run from. Kernel is compiled for an
865 address which meets above alignment restriction.
867 config TASK_SIZE_BOOL
868 bool "Set custom user task size"
869 depends on ADVANCED_OPTIONS
871 This option allows you to set the amount of virtual address space
872 allocated to user tasks. This can be useful in optimizing the
873 virtual memory layout of the system.
875 Say N here unless you know what you are doing.
878 hex "Size of user task space" if TASK_SIZE_BOOL
879 default "0x80000000" if PPC_PREP || PPC_8xx
882 config CONSISTENT_SIZE_BOOL
883 bool "Set custom consistent memory pool size"
884 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
886 This option allows you to set the size of the
887 consistent memory pool. This pool of virtual memory
888 is used to make consistent memory allocations.
890 config CONSISTENT_SIZE
891 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
892 default "0x00200000" if NOT_COHERENT_CACHE
895 bool "Pinned Kernel TLBs (860 ONLY)"
896 depends on ADVANCED_OPTIONS && 8xx
901 bool "Build a relocatable kernel"
903 This builds a kernel image that is capable of running anywhere
904 in the RMA (real memory area) at any 16k-aligned base address.
905 The kernel is linked as a position-independent executable (PIE)
906 and contains dynamic relocations which are processed early
907 in the bootup process.
909 One use is for the kexec on panic case where the recovery kernel
910 must live at a different physical address than the primary
915 default "0xc000000000000000"
918 default "0xc000000000000000"
919 config PHYSICAL_START
926 source "drivers/Kconfig"
930 source "arch/powerpc/sysdev/qe_lib/Kconfig"
934 source "arch/powerpc/Kconfig.debug"
936 source "security/Kconfig"
940 depends on COMPAT && KEYS
943 source "crypto/Kconfig"
953 source "arch/powerpc/kvm/Kconfig"