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
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.
311 bool "Support for enabling/disabling CPUs"
312 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
314 Say Y here to be able to disable and re-enable individual
315 CPUs at runtime on SMP machines.
317 Say N if you are unsure.
319 config ARCH_ENABLE_MEMORY_HOTPLUG
322 config ARCH_HAS_WALK_MEMORY
325 config ARCH_ENABLE_MEMORY_HOTREMOVE
329 bool "kexec system call (EXPERIMENTAL)"
330 depends on PPC_BOOK3S && EXPERIMENTAL
332 kexec is a system call that implements the ability to shutdown your
333 current kernel, and to start another kernel. It is like a reboot
334 but it is independent of the system firmware. And like a reboot
335 you can start any kernel with it, not just Linux.
337 The name comes from the similarity to the exec system call.
339 It is an ongoing process to be certain the hardware in a machine
340 is properly shutdown, so do not be surprised if this code does not
341 initially work for you. It may help to enable device hotplugging
342 support. As of this writing the exact hardware interface is
343 strongly in flux, so no good recommendation can be made.
346 bool "Build a kdump crash kernel"
347 depends on PPC64 || 6xx
348 select RELOCATABLE if PPC64
350 Build a kernel suitable for use as a kdump capture kernel.
351 The same kernel binary can be used as production kernel and dump
355 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
356 depends on PPC_PSERIES && EXPERIMENTAL
358 Hypervisor-assisted dump is meant to be a kdump replacement
359 offering robustness and speed not possible without system
360 hypervisor assistance.
365 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
366 default y if PPC_PREP
369 bool "Distribute interrupts on all CPUs by default"
370 depends on SMP && !MV64360
372 This option gives the kernel permission to distribute IRQs across
373 multiple CPUs. Saying N here will route all IRQs to the first
374 CPU. Generally saying Y is safe, although some problems have been
375 reported with SMP Power Macintoshes with this option enabled.
380 default y if SMP && PPC_PSERIES
385 depends on NEED_MULTIPLE_NODES
387 config ARCH_SELECT_MEMORY_MODEL
391 config ARCH_FLATMEM_ENABLE
393 depends on (PPC64 && !NUMA) || PPC32
395 config ARCH_SPARSEMEM_ENABLE
398 select SPARSEMEM_VMEMMAP_ENABLE
400 config ARCH_SPARSEMEM_DEFAULT
402 depends on (SMP && PPC_PSERIES) || PPC_PS3
404 config ARCH_POPULATES_NODE_MAP
409 config ARCH_MEMORY_PROBE
411 depends on MEMORY_HOTPLUG
413 # Some NUMA nodes have memory ranges that span
414 # other nodes. Even though a pfn is valid and
415 # between a node's start and end pfns, it may not
416 # reside on that node. See memmap_init_zone()
418 config NODES_SPAN_OTHER_NODES
420 depends on NEED_MULTIPLE_NODES
422 config PPC_HAS_HASH_64K
428 bool "Using standard binutils settings"
432 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
433 Note, that kernel will be able to run only those applications,
434 which had been compiled using binutils later than 2.17.50.0.3 with
435 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
436 the older binutils, you can patch them with a trivial patch, which
437 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
443 Select the kernel logical page size. Increasing the page size
444 will reduce software overhead at each page boundary, allow
445 hardware prefetch mechanisms to be more effective, and allow
446 larger dma transfers increasing IO efficiency and reducing
447 overhead. However the utilization of memory will increase.
448 For example, each cached file will using a multiple of the
449 page size to hold its contents and the difference between the
450 end of file and the end of page is wasted.
452 Some dedicated systems, such as software raid serving with
453 accelerated calculations, have shown significant increases.
455 If you configure a 64 bit kernel for 64k pages but the
456 processor does not support them, then the kernel will simulate
457 them with 4k pages, loading them on demand, but with the
458 reduced software overhead and larger internal fragmentation.
459 For the 32 bit kernel, a large page option will not be offered
460 unless it is supported by the configured processor.
462 If unsure, choose 4K_PAGES.
468 bool "16k page size" if 44x
471 bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
472 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
474 config PPC_256K_PAGES
475 bool "256k page size" if 44x
476 depends on !STDBINUTILS
478 Make the page size 256k.
480 As the ELF standard only requires alignment to support page
481 sizes up to 64k, you will need to compile all of your user
482 space applications with a non-standard binutils settings
483 (see the STDBINUTILS description for details).
485 Say N unless you know what you are doing.
489 config FORCE_MAX_ZONEORDER
490 int "Maximum zone order"
491 range 9 64 if PPC64 && PPC_64K_PAGES
492 default "9" if PPC64 && PPC_64K_PAGES
493 range 13 64 if PPC64 && !PPC_64K_PAGES
494 default "13" if PPC64 && !PPC_64K_PAGES
495 range 9 64 if PPC32 && PPC_16K_PAGES
496 default "9" if PPC32 && PPC_16K_PAGES
497 range 7 64 if PPC32 && PPC_64K_PAGES
498 default "7" if PPC32 && PPC_64K_PAGES
499 range 5 64 if PPC32 && PPC_256K_PAGES
500 default "5" if PPC32 && PPC_256K_PAGES
504 The kernel memory allocator divides physically contiguous memory
505 blocks into "zones", where each zone is a power of two number of
506 pages. This option selects the largest power of two that the kernel
507 keeps in the memory allocator. If you need to allocate very large
508 blocks of physically contiguous memory, then you may need to
511 This config option is actually maximum order plus one. For example,
512 a value of 11 means that the largest free memory block is 2^10 pages.
514 The page size is not necessarily 4KB. For example, on 64-bit
515 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
516 this in mind when choosing a value for this option.
518 config PPC_SUBPAGE_PROT
519 bool "Support setting protections for 4k subpages"
520 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
522 This option adds support for a system call to allow user programs
523 to set access permissions (read/write, readonly, or no access)
524 on the 4k subpages of each 64k page.
527 bool "SMT (Hyperthreading) scheduler support"
528 depends on PPC64 && SMP
530 SMT scheduler support improves the CPU scheduler's decision making
531 when dealing with POWER5 cpus at a cost of slightly increased
532 overhead in some places. If unsure say N here.
534 config PROC_DEVICETREE
535 bool "Support for device tree in /proc"
538 This option adds a device-tree directory under /proc which contains
539 an image of the device tree that the kernel copies from Open
540 Firmware or other boot firmware. If unsure, say Y here.
543 bool "Default bootloader kernel arguments"
546 string "Initial kernel command string"
547 depends on CMDLINE_BOOL
548 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
550 On some platforms, there is currently no way for the boot loader to
551 pass arguments to the kernel. For these platforms, you can supply
552 some command-line options at build time by entering them here. In
553 most cases you will need to specify the root device here.
556 string "Additional default image types"
558 List additional targets to be built by the bootwrapper here (separated
559 by spaces). This is useful for targets that depend of device tree
560 files in the .dts directory.
562 Targets in this list will be build as part of the default build
563 target, or when the user does a 'make zImage' or a
564 'make zImage.initrd'.
566 If unsure, leave blank
569 config ARCH_WANTS_FREEZER_CONTROL
573 source kernel/power/Kconfig
577 bool "Enable seccomp to safely compute untrusted bytecode"
581 This kernel feature is useful for number crunching applications
582 that may need to compute untrusted bytecode during their
583 execution. By using pipes or other transports made available to
584 the process as file descriptors supporting the read/write
585 syscalls, it's possible to isolate those applications in
586 their own address space using seccomp. Once seccomp is
587 enabled via /proc/<pid>/seccomp, it cannot be disabled
588 and the task is only allowed to execute a few safe syscalls
589 defined by each seccomp mode.
591 If unsure, say Y. Only embedded should say N here.
597 default !PPC_ISERIES || PCI
602 bool "Support for ISA-bus hardware"
603 depends on PPC_PREP || PPC_CHRP
606 Find out whether you have ISA slots on your motherboard. ISA is the
607 name of a bus system, i.e. the way the CPU talks to the other stuff
608 inside your box. If you have an Apple machine, say N here; if you
609 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
610 you have an embedded board, consult your board documentation.
616 config GENERIC_ISA_DMA
618 depends on PPC64 || POWER4 || 6xx && !CPM2
621 config PPC_INDIRECT_PCI
624 default y if 40x || 44x
638 select PPC_INDIRECT_PCI
647 Freescale Localbus support
651 depends on PPC_83xx || QUICC_ENGINE || CPM2
653 Freescale General-purpose Timers support
655 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
659 # Platforms that what PCI turned unconditionally just do select PCI
660 # in their config node. Platforms that want to choose at config
661 # time should select PPC_PCI_CHOICE
662 config PPC_PCI_CHOICE
666 bool "PCI support" if PPC_PCI_CHOICE
667 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
668 && !PPC_85xx && !PPC_86xx
669 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
670 default PCI_QSPAN if !4xx && !CPM2 && 8xx
671 select ARCH_SUPPORTS_MSI
673 Find out whether your system includes a PCI bus. PCI is the name of
674 a bus system, i.e. the way the CPU talks to the other stuff inside
675 your box. If you say Y here, the kernel will include drivers and
676 infrastructure code to support PCI bus devices.
686 depends on !4xx && !CPM2 && 8xx
689 Say Y here if you have a system based on a Motorola 8xx-series
690 embedded processor with a QSPAN PCI interface, otherwise say N.
694 depends on PCI && 8260
695 select PPC_INDIRECT_PCI
699 bool "Enable workaround for MPC826x erratum PCI 9"
700 depends on PCI_8260 && !8272
704 prompt "IDMA channel for PCI 9 workaround"
707 config 8260_PCI9_IDMA1
710 config 8260_PCI9_IDMA2
713 config 8260_PCI9_IDMA3
716 config 8260_PCI9_IDMA4
721 source "drivers/pci/pcie/Kconfig"
723 source "drivers/pci/Kconfig"
725 source "drivers/pcmcia/Kconfig"
727 source "drivers/pci/hotplug/Kconfig"
734 bool "RapidIO support"
735 depends on HAS_RAPIDIO
737 If you say Y here, the kernel will include drivers and
738 infrastructure code to support RapidIO interconnect devices.
740 source "drivers/rapidio/Kconfig"
744 menu "Advanced setup"
747 config ADVANCED_OPTIONS
748 bool "Prompt for advanced kernel configuration options"
750 This option will enable prompting for a variety of advanced kernel
751 configuration options. These options can cause the kernel to not
752 work if they are set incorrectly, but can be used to optimize certain
753 aspects of kernel memory management.
755 Unless you know what you are doing, say N here.
757 comment "Default settings for advanced configuration options are used"
758 depends on !ADVANCED_OPTIONS
760 config LOWMEM_SIZE_BOOL
761 bool "Set maximum low memory"
762 depends on ADVANCED_OPTIONS
764 This option allows you to set the maximum amount of memory which
765 will be used as "low memory", that is, memory which the kernel can
766 access directly, without having to set up a kernel virtual mapping.
767 This can be useful in optimizing the layout of kernel virtual
770 Say N here unless you know what you are doing.
773 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
776 config LOWMEM_CAM_NUM_BOOL
777 bool "Set number of CAMs to use to map low memory"
778 depends on ADVANCED_OPTIONS && FSL_BOOKE
780 This option allows you to set the maximum number of CAM slots that
781 will be used to map low memory. There are a limited number of slots
782 available and even more limited number that will fit in the L1 MMU.
783 However, using more entries will allow mapping more low memory. This
784 can be useful in optimizing the layout of kernel virtual memory.
786 Say N here unless you know what you are doing.
788 config LOWMEM_CAM_NUM
790 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
794 bool "Build a relocatable kernel (EXPERIMENTAL)"
795 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
797 This builds a kernel image that is capable of running at the
798 location the kernel is loaded at (some alignment restrictions may
801 One use is for the kexec on panic case where the recovery kernel
802 must live at a different physical address than the primary
805 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
806 it has been loaded at and the compile time physical addresses
807 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
808 setting can still be useful to bootwrappers that need to know the
809 load location of the kernel (eg. u-boot/mkimage).
811 config PAGE_OFFSET_BOOL
812 bool "Set custom page offset address"
813 depends on ADVANCED_OPTIONS
815 This option allows you to set the kernel virtual address at which
816 the kernel will map low memory. This can be useful in optimizing
817 the virtual memory layout of the system.
819 Say N here unless you know what you are doing.
822 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
825 config KERNEL_START_BOOL
826 bool "Set custom kernel base address"
827 depends on ADVANCED_OPTIONS
829 This option allows you to set the kernel virtual address at which
830 the kernel will be loaded. Normally this should match PAGE_OFFSET
831 however there are times (like kdump) that one might not want them
834 Say N here unless you know what you are doing.
837 hex "Virtual address of kernel base" if KERNEL_START_BOOL
838 default PAGE_OFFSET if PAGE_OFFSET_BOOL
839 default "0xc2000000" if CRASH_DUMP
842 config PHYSICAL_START_BOOL
843 bool "Set physical address where the kernel is loaded"
844 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
846 This gives the physical address where the kernel is loaded.
848 Say N here unless you know what you are doing.
850 config PHYSICAL_START
851 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
852 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
855 config PHYSICAL_ALIGN
857 default "0x04000000" if FSL_BOOKE
859 This value puts the alignment restrictions on physical address
860 where kernel is loaded and run from. Kernel is compiled for an
861 address which meets above alignment restriction.
863 config TASK_SIZE_BOOL
864 bool "Set custom user task size"
865 depends on ADVANCED_OPTIONS
867 This option allows you to set the amount of virtual address space
868 allocated to user tasks. This can be useful in optimizing the
869 virtual memory layout of the system.
871 Say N here unless you know what you are doing.
874 hex "Size of user task space" if TASK_SIZE_BOOL
875 default "0x80000000" if PPC_PREP || PPC_8xx
878 config CONSISTENT_SIZE_BOOL
879 bool "Set custom consistent memory pool size"
880 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
882 This option allows you to set the size of the
883 consistent memory pool. This pool of virtual memory
884 is used to make consistent memory allocations.
886 config CONSISTENT_SIZE
887 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
888 default "0x00200000" if NOT_COHERENT_CACHE
891 bool "Pinned Kernel TLBs (860 ONLY)"
892 depends on ADVANCED_OPTIONS && 8xx
897 bool "Build a relocatable kernel"
899 This builds a kernel image that is capable of running anywhere
900 in the RMA (real memory area) at any 16k-aligned base address.
901 The kernel is linked as a position-independent executable (PIE)
902 and contains dynamic relocations which are processed early
903 in the bootup process.
905 One use is for the kexec on panic case where the recovery kernel
906 must live at a different physical address than the primary
911 default "0xc000000000000000"
914 default "0xc000000000000000"
915 config PHYSICAL_START
922 source "drivers/Kconfig"
926 source "arch/powerpc/sysdev/qe_lib/Kconfig"
930 source "arch/powerpc/Kconfig.debug"
932 source "security/Kconfig"
936 depends on COMPAT && KEYS
939 source "crypto/Kconfig"
949 source "arch/powerpc/kvm/Kconfig"