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
128 select GENERIC_ATOMIC64 if PPC32
129 select HAVE_PERF_COUNTERS
138 select COMPAT_BINFMT_ELF
140 config SYSVIPC_COMPAT
142 depends on COMPAT && SYSVIPC
145 # All PPC32s use generic nvram driver through ppc_md
150 config SCHED_OMIT_FRAME_POINTER
154 config ARCH_MAY_HAVE_PC_FDC
156 default !PPC_PSERIES || PCI
164 config PPC_UDBG_16550
168 config GENERIC_TBSYNC
170 default y if PPC32 && SMP
182 config SYS_SUPPORTS_APM_EMULATION
183 default y if PMAC_APM_EMU
190 config DEFAULT_UIMAGE
193 Used to allow a board to specify it wants a uImage built by default
201 depends on (PPC_PMAC && !SMP) || BROKEN
206 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
209 config ARCH_HIBERNATION_POSSIBLE
211 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
214 config ARCH_SUSPEND_POSSIBLE
216 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
218 config PPC_DCR_NATIVE
228 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
231 config PPC_OF_PLATFORM_PCI
234 depends on PPC64 # not supported on 32 bits yet
237 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
240 source "init/Kconfig"
242 source "kernel/Kconfig.freezer"
244 source "arch/powerpc/sysdev/Kconfig"
245 source "arch/powerpc/platforms/Kconfig"
247 menu "Kernel options"
250 bool "High memory support"
253 source kernel/time/Kconfig
254 source kernel/Kconfig.hz
255 source kernel/Kconfig.preempt
256 source "fs/Kconfig.binfmt"
258 config HUGETLB_PAGE_SIZE_VARIABLE
260 depends on HUGETLB_PAGE
263 config MATH_EMULATION
264 bool "Math emulation"
265 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
267 Some PowerPC chips designed for embedded applications do not have
268 a floating-point unit and therefore do not implement the
269 floating-point instructions in the PowerPC instruction set. If you
270 say Y here, the kernel will include code to emulate a floating-point
271 unit, which will allow programs that use floating-point
274 config 8XX_MINIMAL_FPEMU
275 bool "Minimal math emulation for 8xx"
276 depends on 8xx && !MATH_EMULATION
278 Older arch/ppc kernels still emulated a few floating point
279 instructions such as load and store, even when full math
280 emulation is disabled. Say "Y" here if you want to preserve
283 It is recommended that you build a soft-float userspace instead.
286 bool "Enable IOMMU virtual merging"
290 Cause IO segments sent to a device for DMA to be merged virtually
291 by the IOMMU when they happen to have been allocated contiguously.
292 This doesn't add pressure to the IOMMU allocator. However, some
293 drivers don't support getting large merged segments coming back
296 Most drivers don't have this problem; it is safe to say Y here.
302 bool "SWIOTLB support"
306 Support for IO bounce buffering for systems without an IOMMU.
307 This allows us to DMA to the full physical address space on
308 platforms where the size of a physical address is larger
309 than the bus address. Not all platforms support this.
311 config PPC_NEED_DMA_SYNC_OPS
313 depends on (NOT_COHERENT_CACHE || SWIOTLB)
316 bool "Support for enabling/disabling CPUs"
317 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
319 Say Y here to be able to disable and re-enable individual
320 CPUs at runtime on SMP machines.
322 Say N if you are unsure.
324 config ARCH_ENABLE_MEMORY_HOTPLUG
327 config ARCH_HAS_WALK_MEMORY
330 config ARCH_ENABLE_MEMORY_HOTREMOVE
334 bool "kexec system call (EXPERIMENTAL)"
335 depends on PPC_BOOK3S && EXPERIMENTAL
337 kexec is a system call that implements the ability to shutdown your
338 current kernel, and to start another kernel. It is like a reboot
339 but it is independent of the system firmware. And like a reboot
340 you can start any kernel with it, not just Linux.
342 The name comes from the similarity to the exec system call.
344 It is an ongoing process to be certain the hardware in a machine
345 is properly shutdown, so do not be surprised if this code does not
346 initially work for you. It may help to enable device hotplugging
347 support. As of this writing the exact hardware interface is
348 strongly in flux, so no good recommendation can be made.
351 bool "Build a kdump crash kernel"
352 depends on PPC64 || 6xx
353 select RELOCATABLE if PPC64
355 Build a kernel suitable for use as a kdump capture kernel.
356 The same kernel binary can be used as production kernel and dump
360 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
361 depends on PPC_PSERIES && EXPERIMENTAL
363 Hypervisor-assisted dump is meant to be a kdump replacement
364 offering robustness and speed not possible without system
365 hypervisor assistance.
370 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
371 default y if PPC_PREP
374 bool "Distribute interrupts on all CPUs by default"
375 depends on SMP && !MV64360
377 This option gives the kernel permission to distribute IRQs across
378 multiple CPUs. Saying N here will route all IRQs to the first
379 CPU. Generally saying Y is safe, although some problems have been
380 reported with SMP Power Macintoshes with this option enabled.
385 default y if SMP && PPC_PSERIES
390 depends on NEED_MULTIPLE_NODES
392 config ARCH_SELECT_MEMORY_MODEL
396 config ARCH_FLATMEM_ENABLE
398 depends on (PPC64 && !NUMA) || PPC32
400 config ARCH_SPARSEMEM_ENABLE
403 select SPARSEMEM_VMEMMAP_ENABLE
405 config ARCH_SPARSEMEM_DEFAULT
407 depends on (SMP && PPC_PSERIES) || PPC_PS3
409 config ARCH_POPULATES_NODE_MAP
414 config ARCH_MEMORY_PROBE
416 depends on MEMORY_HOTPLUG
418 # Some NUMA nodes have memory ranges that span
419 # other nodes. Even though a pfn is valid and
420 # between a node's start and end pfns, it may not
421 # reside on that node. See memmap_init_zone()
423 config NODES_SPAN_OTHER_NODES
425 depends on NEED_MULTIPLE_NODES
427 config PPC_HAS_HASH_64K
433 bool "Using standard binutils settings"
437 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
438 Note, that kernel will be able to run only those applications,
439 which had been compiled using binutils later than 2.17.50.0.3 with
440 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
441 the older binutils, you can patch them with a trivial patch, which
442 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
448 Select the kernel logical page size. Increasing the page size
449 will reduce software overhead at each page boundary, allow
450 hardware prefetch mechanisms to be more effective, and allow
451 larger dma transfers increasing IO efficiency and reducing
452 overhead. However the utilization of memory will increase.
453 For example, each cached file will using a multiple of the
454 page size to hold its contents and the difference between the
455 end of file and the end of page is wasted.
457 Some dedicated systems, such as software raid serving with
458 accelerated calculations, have shown significant increases.
460 If you configure a 64 bit kernel for 64k pages but the
461 processor does not support them, then the kernel will simulate
462 them with 4k pages, loading them on demand, but with the
463 reduced software overhead and larger internal fragmentation.
464 For the 32 bit kernel, a large page option will not be offered
465 unless it is supported by the configured processor.
467 If unsure, choose 4K_PAGES.
473 bool "16k page size" if 44x
476 bool "64k page size" if 44x || PPC_STD_MMU_64
477 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
479 config PPC_256K_PAGES
480 bool "256k page size" if 44x
481 depends on !STDBINUTILS
483 Make the page size 256k.
485 As the ELF standard only requires alignment to support page
486 sizes up to 64k, you will need to compile all of your user
487 space applications with a non-standard binutils settings
488 (see the STDBINUTILS description for details).
490 Say N unless you know what you are doing.
494 config FORCE_MAX_ZONEORDER
495 int "Maximum zone order"
496 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
497 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
498 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
499 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
500 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
501 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
502 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
503 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
504 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
505 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
509 The kernel memory allocator divides physically contiguous memory
510 blocks into "zones", where each zone is a power of two number of
511 pages. This option selects the largest power of two that the kernel
512 keeps in the memory allocator. If you need to allocate very large
513 blocks of physically contiguous memory, then you may need to
516 This config option is actually maximum order plus one. For example,
517 a value of 11 means that the largest free memory block is 2^10 pages.
519 The page size is not necessarily 4KB. For example, on 64-bit
520 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
521 this in mind when choosing a value for this option.
523 config PPC_SUBPAGE_PROT
524 bool "Support setting protections for 4k subpages"
525 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
527 This option adds support for a system call to allow user programs
528 to set access permissions (read/write, readonly, or no access)
529 on the 4k subpages of each 64k page.
532 bool "SMT (Hyperthreading) scheduler support"
533 depends on PPC64 && SMP
535 SMT scheduler support improves the CPU scheduler's decision making
536 when dealing with POWER5 cpus at a cost of slightly increased
537 overhead in some places. If unsure say N here.
539 config PROC_DEVICETREE
540 bool "Support for device tree in /proc"
543 This option adds a device-tree directory under /proc which contains
544 an image of the device tree that the kernel copies from Open
545 Firmware or other boot firmware. If unsure, say Y here.
548 bool "Default bootloader kernel arguments"
551 string "Initial kernel command string"
552 depends on CMDLINE_BOOL
553 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
555 On some platforms, there is currently no way for the boot loader to
556 pass arguments to the kernel. For these platforms, you can supply
557 some command-line options at build time by entering them here. In
558 most cases you will need to specify the root device here.
561 string "Additional default image types"
563 List additional targets to be built by the bootwrapper here (separated
564 by spaces). This is useful for targets that depend of device tree
565 files in the .dts directory.
567 Targets in this list will be build as part of the default build
568 target, or when the user does a 'make zImage' or a
569 'make zImage.initrd'.
571 If unsure, leave blank
574 config ARCH_WANTS_FREEZER_CONTROL
578 source kernel/power/Kconfig
582 bool "Enable seccomp to safely compute untrusted bytecode"
586 This kernel feature is useful for number crunching applications
587 that may need to compute untrusted bytecode during their
588 execution. By using pipes or other transports made available to
589 the process as file descriptors supporting the read/write
590 syscalls, it's possible to isolate those applications in
591 their own address space using seccomp. Once seccomp is
592 enabled via /proc/<pid>/seccomp, it cannot be disabled
593 and the task is only allowed to execute a few safe syscalls
594 defined by each seccomp mode.
596 If unsure, say Y. Only embedded should say N here.
602 default !PPC_ISERIES || PCI
607 bool "Support for ISA-bus hardware"
608 depends on PPC_PREP || PPC_CHRP
611 Find out whether you have ISA slots on your motherboard. ISA is the
612 name of a bus system, i.e. the way the CPU talks to the other stuff
613 inside your box. If you have an Apple machine, say N here; if you
614 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
615 you have an embedded board, consult your board documentation.
621 config GENERIC_ISA_DMA
623 depends on PPC64 || POWER4 || 6xx && !CPM2
626 config PPC_INDIRECT_PCI
629 default y if 40x || 44x
643 select PPC_INDIRECT_PCI
652 Freescale Localbus support
656 depends on PPC_83xx || QUICC_ENGINE || CPM2
658 Freescale General-purpose Timers support
660 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
664 # Platforms that what PCI turned unconditionally just do select PCI
665 # in their config node. Platforms that want to choose at config
666 # time should select PPC_PCI_CHOICE
667 config PPC_PCI_CHOICE
671 bool "PCI support" if PPC_PCI_CHOICE
672 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
673 && !PPC_85xx && !PPC_86xx
674 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
675 default PCI_QSPAN if !4xx && !CPM2 && 8xx
676 select ARCH_SUPPORTS_MSI
678 Find out whether your system includes a PCI bus. PCI is the name of
679 a bus system, i.e. the way the CPU talks to the other stuff inside
680 your box. If you say Y here, the kernel will include drivers and
681 infrastructure code to support PCI bus devices.
691 depends on !4xx && !CPM2 && 8xx
694 Say Y here if you have a system based on a Motorola 8xx-series
695 embedded processor with a QSPAN PCI interface, otherwise say N.
699 depends on PCI && 8260
700 select PPC_INDIRECT_PCI
704 bool "Enable workaround for MPC826x erratum PCI 9"
705 depends on PCI_8260 && !8272
709 prompt "IDMA channel for PCI 9 workaround"
712 config 8260_PCI9_IDMA1
715 config 8260_PCI9_IDMA2
718 config 8260_PCI9_IDMA3
721 config 8260_PCI9_IDMA4
726 source "drivers/pci/pcie/Kconfig"
728 source "drivers/pci/Kconfig"
730 source "drivers/pcmcia/Kconfig"
732 source "drivers/pci/hotplug/Kconfig"
739 bool "RapidIO support"
740 depends on HAS_RAPIDIO
742 If you say Y here, the kernel will include drivers and
743 infrastructure code to support RapidIO interconnect devices.
745 source "drivers/rapidio/Kconfig"
749 menu "Advanced setup"
752 config ADVANCED_OPTIONS
753 bool "Prompt for advanced kernel configuration options"
755 This option will enable prompting for a variety of advanced kernel
756 configuration options. These options can cause the kernel to not
757 work if they are set incorrectly, but can be used to optimize certain
758 aspects of kernel memory management.
760 Unless you know what you are doing, say N here.
762 comment "Default settings for advanced configuration options are used"
763 depends on !ADVANCED_OPTIONS
765 config LOWMEM_SIZE_BOOL
766 bool "Set maximum low memory"
767 depends on ADVANCED_OPTIONS
769 This option allows you to set the maximum amount of memory which
770 will be used as "low memory", that is, memory which the kernel can
771 access directly, without having to set up a kernel virtual mapping.
772 This can be useful in optimizing the layout of kernel virtual
775 Say N here unless you know what you are doing.
778 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
781 config LOWMEM_CAM_NUM_BOOL
782 bool "Set number of CAMs to use to map low memory"
783 depends on ADVANCED_OPTIONS && FSL_BOOKE
785 This option allows you to set the maximum number of CAM slots that
786 will be used to map low memory. There are a limited number of slots
787 available and even more limited number that will fit in the L1 MMU.
788 However, using more entries will allow mapping more low memory. This
789 can be useful in optimizing the layout of kernel virtual memory.
791 Say N here unless you know what you are doing.
793 config LOWMEM_CAM_NUM
795 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
799 bool "Build a relocatable kernel (EXPERIMENTAL)"
800 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
802 This builds a kernel image that is capable of running at the
803 location the kernel is loaded at (some alignment restrictions may
806 One use is for the kexec on panic case where the recovery kernel
807 must live at a different physical address than the primary
810 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
811 it has been loaded at and the compile time physical addresses
812 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
813 setting can still be useful to bootwrappers that need to know the
814 load location of the kernel (eg. u-boot/mkimage).
816 config PAGE_OFFSET_BOOL
817 bool "Set custom page offset address"
818 depends on ADVANCED_OPTIONS
820 This option allows you to set the kernel virtual address at which
821 the kernel will map low memory. This can be useful in optimizing
822 the virtual memory layout of the system.
824 Say N here unless you know what you are doing.
827 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
830 config KERNEL_START_BOOL
831 bool "Set custom kernel base address"
832 depends on ADVANCED_OPTIONS
834 This option allows you to set the kernel virtual address at which
835 the kernel will be loaded. Normally this should match PAGE_OFFSET
836 however there are times (like kdump) that one might not want them
839 Say N here unless you know what you are doing.
842 hex "Virtual address of kernel base" if KERNEL_START_BOOL
843 default PAGE_OFFSET if PAGE_OFFSET_BOOL
844 default "0xc2000000" if CRASH_DUMP
847 config PHYSICAL_START_BOOL
848 bool "Set physical address where the kernel is loaded"
849 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
851 This gives the physical address where the kernel is loaded.
853 Say N here unless you know what you are doing.
855 config PHYSICAL_START
856 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
857 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
860 config PHYSICAL_ALIGN
862 default "0x04000000" if FSL_BOOKE
864 This value puts the alignment restrictions on physical address
865 where kernel is loaded and run from. Kernel is compiled for an
866 address which meets above alignment restriction.
868 config TASK_SIZE_BOOL
869 bool "Set custom user task size"
870 depends on ADVANCED_OPTIONS
872 This option allows you to set the amount of virtual address space
873 allocated to user tasks. This can be useful in optimizing the
874 virtual memory layout of the system.
876 Say N here unless you know what you are doing.
879 hex "Size of user task space" if TASK_SIZE_BOOL
880 default "0x80000000" if PPC_PREP || PPC_8xx
883 config CONSISTENT_SIZE_BOOL
884 bool "Set custom consistent memory pool size"
885 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
887 This option allows you to set the size of the
888 consistent memory pool. This pool of virtual memory
889 is used to make consistent memory allocations.
891 config CONSISTENT_SIZE
892 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
893 default "0x00200000" if NOT_COHERENT_CACHE
896 bool "Pinned Kernel TLBs (860 ONLY)"
897 depends on ADVANCED_OPTIONS && 8xx
902 bool "Build a relocatable kernel"
904 This builds a kernel image that is capable of running anywhere
905 in the RMA (real memory area) at any 16k-aligned base address.
906 The kernel is linked as a position-independent executable (PIE)
907 and contains dynamic relocations which are processed early
908 in the bootup process.
910 One use is for the kexec on panic case where the recovery kernel
911 must live at a different physical address than the primary
916 default "0xc000000000000000"
919 default "0xc000000000000000"
920 config PHYSICAL_START
927 source "drivers/Kconfig"
931 source "arch/powerpc/sysdev/qe_lib/Kconfig"
935 source "arch/powerpc/Kconfig.debug"
937 source "security/Kconfig"
941 depends on COMPAT && KEYS
944 source "crypto/Kconfig"
954 source "arch/powerpc/kvm/Kconfig"