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_CALIBRATE_DELAY
100 config GENERIC_FIND_NEXT_BIT
107 Generic GPIO API support
109 config ARCH_NO_VIRT_TO_BUS
115 select HAVE_FTRACE_MCOUNT_RECORD
116 select HAVE_DYNAMIC_FTRACE
117 select HAVE_FUNCTION_TRACER
118 select HAVE_FUNCTION_GRAPH_TRACER
119 select ARCH_WANT_OPTIONAL_GPIOLIB
121 select HAVE_IOREMAP_PROT
122 select HAVE_EFFICIENT_UNALIGNED_ACCESS
124 select HAVE_ARCH_KGDB
125 select HAVE_KRETPROBES
126 select HAVE_ARCH_TRACEHOOK
128 select HAVE_DMA_ATTRS if PPC64
129 select USE_GENERIC_SMP_HELPERS if SMP
131 select HAVE_SYSCALL_WRAPPERS if PPC64
140 select COMPAT_BINFMT_ELF
142 config SYSVIPC_COMPAT
144 depends on COMPAT && SYSVIPC
147 # All PPC32s use generic nvram driver through ppc_md
152 config SCHED_OMIT_FRAME_POINTER
156 config ARCH_MAY_HAVE_PC_FDC
158 default !PPC_PSERIES || PCI
166 config PPC_UDBG_16550
170 config GENERIC_TBSYNC
172 default y if PPC32 && SMP
184 config SYS_SUPPORTS_APM_EMULATION
185 default y if PMAC_APM_EMU
192 config DEFAULT_UIMAGE
195 Used to allow a board to specify it wants a uImage built by default
203 depends on (PPC_PMAC && !SMP) || BROKEN
208 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
211 config ARCH_HIBERNATION_POSSIBLE
213 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
216 config ARCH_SUSPEND_POSSIBLE
218 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
220 config PPC_DCR_NATIVE
230 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
233 config PPC_OF_PLATFORM_PCI
236 depends on PPC64 # not supported on 32 bits yet
239 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
242 source "init/Kconfig"
244 source "kernel/Kconfig.freezer"
246 source "arch/powerpc/sysdev/Kconfig"
247 source "arch/powerpc/platforms/Kconfig"
249 menu "Kernel options"
252 bool "High memory support"
255 source kernel/time/Kconfig
256 source kernel/Kconfig.hz
257 source kernel/Kconfig.preempt
258 source "fs/Kconfig.binfmt"
260 config HUGETLB_PAGE_SIZE_VARIABLE
262 depends on HUGETLB_PAGE
265 config MATH_EMULATION
266 bool "Math emulation"
267 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
269 Some PowerPC chips designed for embedded applications do not have
270 a floating-point unit and therefore do not implement the
271 floating-point instructions in the PowerPC instruction set. If you
272 say Y here, the kernel will include code to emulate a floating-point
273 unit, which will allow programs that use floating-point
276 config 8XX_MINIMAL_FPEMU
277 bool "Minimal math emulation for 8xx"
278 depends on 8xx && !MATH_EMULATION
280 Older arch/ppc kernels still emulated a few floating point
281 instructions such as load and store, even when full math
282 emulation is disabled. Say "Y" here if you want to preserve
285 It is recommended that you build a soft-float userspace instead.
288 bool "Enable IOMMU virtual merging"
292 Cause IO segments sent to a device for DMA to be merged virtually
293 by the IOMMU when they happen to have been allocated contiguously.
294 This doesn't add pressure to the IOMMU allocator. However, some
295 drivers don't support getting large merged segments coming back
298 Most drivers don't have this problem; it is safe to say Y here.
304 bool "SWIOTLB support"
308 Support for IO bounce buffering for systems without an IOMMU.
309 This allows us to DMA to the full physical address space on
310 platforms where the size of a physical address is larger
311 than the bus address. Not all platforms support this.
313 config PPC_NEED_DMA_SYNC_OPS
315 depends on (NOT_COHERENT_CACHE || SWIOTLB)
318 bool "Support for enabling/disabling CPUs"
319 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
321 Say Y here to be able to disable and re-enable individual
322 CPUs at runtime on SMP machines.
324 Say N if you are unsure.
326 config ARCH_ENABLE_MEMORY_HOTPLUG
329 config ARCH_HAS_WALK_MEMORY
332 config ARCH_ENABLE_MEMORY_HOTREMOVE
336 bool "kexec system call (EXPERIMENTAL)"
337 depends on PPC_BOOK3S && EXPERIMENTAL
339 kexec is a system call that implements the ability to shutdown your
340 current kernel, and to start another kernel. It is like a reboot
341 but it is independent of the system firmware. And like a reboot
342 you can start any kernel with it, not just Linux.
344 The name comes from the similarity to the exec system call.
346 It is an ongoing process to be certain the hardware in a machine
347 is properly shutdown, so do not be surprised if this code does not
348 initially work for you. It may help to enable device hotplugging
349 support. As of this writing the exact hardware interface is
350 strongly in flux, so no good recommendation can be made.
353 bool "Build a kdump crash kernel"
354 depends on PPC64 || 6xx
355 select RELOCATABLE if PPC64
357 Build a kernel suitable for use as a kdump capture kernel.
358 The same kernel binary can be used as production kernel and dump
362 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
363 depends on PPC_PSERIES && EXPERIMENTAL
365 Hypervisor-assisted dump is meant to be a kdump replacement
366 offering robustness and speed not possible without system
367 hypervisor assistance.
372 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
373 default y if PPC_PREP
376 bool "Distribute interrupts on all CPUs by default"
377 depends on SMP && !MV64360
379 This option gives the kernel permission to distribute IRQs across
380 multiple CPUs. Saying N here will route all IRQs to the first
381 CPU. Generally saying Y is safe, although some problems have been
382 reported with SMP Power Macintoshes with this option enabled.
387 default y if SMP && PPC_PSERIES
392 depends on NEED_MULTIPLE_NODES
394 config ARCH_SELECT_MEMORY_MODEL
398 config ARCH_FLATMEM_ENABLE
400 depends on (PPC64 && !NUMA) || PPC32
402 config ARCH_SPARSEMEM_ENABLE
405 select SPARSEMEM_VMEMMAP_ENABLE
407 config ARCH_SPARSEMEM_DEFAULT
409 depends on (SMP && PPC_PSERIES) || PPC_PS3
411 config ARCH_POPULATES_NODE_MAP
416 config ARCH_MEMORY_PROBE
418 depends on MEMORY_HOTPLUG
420 # Some NUMA nodes have memory ranges that span
421 # other nodes. Even though a pfn is valid and
422 # between a node's start and end pfns, it may not
423 # reside on that node. See memmap_init_zone()
425 config NODES_SPAN_OTHER_NODES
427 depends on NEED_MULTIPLE_NODES
429 config PPC_HAS_HASH_64K
435 bool "Using standard binutils settings"
439 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
440 Note, that kernel will be able to run only those applications,
441 which had been compiled using binutils later than 2.17.50.0.3 with
442 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
443 the older binutils, you can patch them with a trivial patch, which
444 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
450 Select the kernel logical page size. Increasing the page size
451 will reduce software overhead at each page boundary, allow
452 hardware prefetch mechanisms to be more effective, and allow
453 larger dma transfers increasing IO efficiency and reducing
454 overhead. However the utilization of memory will increase.
455 For example, each cached file will using a multiple of the
456 page size to hold its contents and the difference between the
457 end of file and the end of page is wasted.
459 Some dedicated systems, such as software raid serving with
460 accelerated calculations, have shown significant increases.
462 If you configure a 64 bit kernel for 64k pages but the
463 processor does not support them, then the kernel will simulate
464 them with 4k pages, loading them on demand, but with the
465 reduced software overhead and larger internal fragmentation.
466 For the 32 bit kernel, a large page option will not be offered
467 unless it is supported by the configured processor.
469 If unsure, choose 4K_PAGES.
475 bool "16k page size" if 44x
478 bool "64k page size" if 44x || PPC_STD_MMU_64
479 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
481 config PPC_256K_PAGES
482 bool "256k page size" if 44x
483 depends on !STDBINUTILS
485 Make the page size 256k.
487 As the ELF standard only requires alignment to support page
488 sizes up to 64k, you will need to compile all of your user
489 space applications with a non-standard binutils settings
490 (see the STDBINUTILS description for details).
492 Say N unless you know what you are doing.
496 config FORCE_MAX_ZONEORDER
497 int "Maximum zone order"
498 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
499 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
500 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
501 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
502 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
503 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
504 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
505 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
506 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
507 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
511 The kernel memory allocator divides physically contiguous memory
512 blocks into "zones", where each zone is a power of two number of
513 pages. This option selects the largest power of two that the kernel
514 keeps in the memory allocator. If you need to allocate very large
515 blocks of physically contiguous memory, then you may need to
518 This config option is actually maximum order plus one. For example,
519 a value of 11 means that the largest free memory block is 2^10 pages.
521 The page size is not necessarily 4KB. For example, on 64-bit
522 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
523 this in mind when choosing a value for this option.
525 config PPC_SUBPAGE_PROT
526 bool "Support setting protections for 4k subpages"
527 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
529 This option adds support for a system call to allow user programs
530 to set access permissions (read/write, readonly, or no access)
531 on the 4k subpages of each 64k page.
534 bool "SMT (Hyperthreading) scheduler support"
535 depends on PPC64 && SMP
537 SMT scheduler support improves the CPU scheduler's decision making
538 when dealing with POWER5 cpus at a cost of slightly increased
539 overhead in some places. If unsure say N here.
541 config PROC_DEVICETREE
542 bool "Support for device tree in /proc"
545 This option adds a device-tree directory under /proc which contains
546 an image of the device tree that the kernel copies from Open
547 Firmware or other boot firmware. If unsure, say Y here.
550 bool "Default bootloader kernel arguments"
553 string "Initial kernel command string"
554 depends on CMDLINE_BOOL
555 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
557 On some platforms, there is currently no way for the boot loader to
558 pass arguments to the kernel. For these platforms, you can supply
559 some command-line options at build time by entering them here. In
560 most cases you will need to specify the root device here.
563 string "Additional default image types"
565 List additional targets to be built by the bootwrapper here (separated
566 by spaces). This is useful for targets that depend of device tree
567 files in the .dts directory.
569 Targets in this list will be build as part of the default build
570 target, or when the user does a 'make zImage' or a
571 'make zImage.initrd'.
573 If unsure, leave blank
576 config ARCH_WANTS_FREEZER_CONTROL
580 source kernel/power/Kconfig
584 bool "Enable seccomp to safely compute untrusted bytecode"
588 This kernel feature is useful for number crunching applications
589 that may need to compute untrusted bytecode during their
590 execution. By using pipes or other transports made available to
591 the process as file descriptors supporting the read/write
592 syscalls, it's possible to isolate those applications in
593 their own address space using seccomp. Once seccomp is
594 enabled via /proc/<pid>/seccomp, it cannot be disabled
595 and the task is only allowed to execute a few safe syscalls
596 defined by each seccomp mode.
598 If unsure, say Y. Only embedded should say N here.
604 default !PPC_ISERIES || PCI
609 bool "Support for ISA-bus hardware"
610 depends on PPC_PREP || PPC_CHRP
613 Find out whether you have ISA slots on your motherboard. ISA is the
614 name of a bus system, i.e. the way the CPU talks to the other stuff
615 inside your box. If you have an Apple machine, say N here; if you
616 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
617 you have an embedded board, consult your board documentation.
623 config GENERIC_ISA_DMA
625 depends on PPC64 || POWER4 || 6xx && !CPM2
628 config PPC_INDIRECT_PCI
631 default y if 40x || 44x
645 select PPC_INDIRECT_PCI
654 Freescale Localbus support
658 depends on PPC_83xx || QUICC_ENGINE || CPM2
660 Freescale General-purpose Timers support
662 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
666 # Platforms that what PCI turned unconditionally just do select PCI
667 # in their config node. Platforms that want to choose at config
668 # time should select PPC_PCI_CHOICE
669 config PPC_PCI_CHOICE
673 bool "PCI support" if PPC_PCI_CHOICE
674 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
675 && !PPC_85xx && !PPC_86xx
676 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
677 default PCI_QSPAN if !4xx && !CPM2 && 8xx
678 select ARCH_SUPPORTS_MSI
680 Find out whether your system includes a PCI bus. PCI is the name of
681 a bus system, i.e. the way the CPU talks to the other stuff inside
682 your box. If you say Y here, the kernel will include drivers and
683 infrastructure code to support PCI bus devices.
693 depends on !4xx && !CPM2 && 8xx
696 Say Y here if you have a system based on a Motorola 8xx-series
697 embedded processor with a QSPAN PCI interface, otherwise say N.
701 depends on PCI && 8260
702 select PPC_INDIRECT_PCI
706 bool "Enable workaround for MPC826x erratum PCI 9"
707 depends on PCI_8260 && !8272
711 prompt "IDMA channel for PCI 9 workaround"
714 config 8260_PCI9_IDMA1
717 config 8260_PCI9_IDMA2
720 config 8260_PCI9_IDMA3
723 config 8260_PCI9_IDMA4
728 source "drivers/pci/pcie/Kconfig"
730 source "drivers/pci/Kconfig"
732 source "drivers/pcmcia/Kconfig"
734 source "drivers/pci/hotplug/Kconfig"
741 bool "RapidIO support"
742 depends on HAS_RAPIDIO
744 If you say Y here, the kernel will include drivers and
745 infrastructure code to support RapidIO interconnect devices.
747 source "drivers/rapidio/Kconfig"
751 menu "Advanced setup"
754 config ADVANCED_OPTIONS
755 bool "Prompt for advanced kernel configuration options"
757 This option will enable prompting for a variety of advanced kernel
758 configuration options. These options can cause the kernel to not
759 work if they are set incorrectly, but can be used to optimize certain
760 aspects of kernel memory management.
762 Unless you know what you are doing, say N here.
764 comment "Default settings for advanced configuration options are used"
765 depends on !ADVANCED_OPTIONS
767 config LOWMEM_SIZE_BOOL
768 bool "Set maximum low memory"
769 depends on ADVANCED_OPTIONS
771 This option allows you to set the maximum amount of memory which
772 will be used as "low memory", that is, memory which the kernel can
773 access directly, without having to set up a kernel virtual mapping.
774 This can be useful in optimizing the layout of kernel virtual
777 Say N here unless you know what you are doing.
780 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
783 config LOWMEM_CAM_NUM_BOOL
784 bool "Set number of CAMs to use to map low memory"
785 depends on ADVANCED_OPTIONS && FSL_BOOKE
787 This option allows you to set the maximum number of CAM slots that
788 will be used to map low memory. There are a limited number of slots
789 available and even more limited number that will fit in the L1 MMU.
790 However, using more entries will allow mapping more low memory. This
791 can be useful in optimizing the layout of kernel virtual memory.
793 Say N here unless you know what you are doing.
795 config LOWMEM_CAM_NUM
797 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
801 bool "Build a relocatable kernel (EXPERIMENTAL)"
802 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
804 This builds a kernel image that is capable of running at the
805 location the kernel is loaded at (some alignment restrictions may
808 One use is for the kexec on panic case where the recovery kernel
809 must live at a different physical address than the primary
812 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
813 it has been loaded at and the compile time physical addresses
814 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
815 setting can still be useful to bootwrappers that need to know the
816 load location of the kernel (eg. u-boot/mkimage).
818 config PAGE_OFFSET_BOOL
819 bool "Set custom page offset address"
820 depends on ADVANCED_OPTIONS
822 This option allows you to set the kernel virtual address at which
823 the kernel will map low memory. This can be useful in optimizing
824 the virtual memory layout of the system.
826 Say N here unless you know what you are doing.
829 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
832 config KERNEL_START_BOOL
833 bool "Set custom kernel base address"
834 depends on ADVANCED_OPTIONS
836 This option allows you to set the kernel virtual address at which
837 the kernel will be loaded. Normally this should match PAGE_OFFSET
838 however there are times (like kdump) that one might not want them
841 Say N here unless you know what you are doing.
844 hex "Virtual address of kernel base" if KERNEL_START_BOOL
845 default PAGE_OFFSET if PAGE_OFFSET_BOOL
846 default "0xc2000000" if CRASH_DUMP
849 config PHYSICAL_START_BOOL
850 bool "Set physical address where the kernel is loaded"
851 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
853 This gives the physical address where the kernel is loaded.
855 Say N here unless you know what you are doing.
857 config PHYSICAL_START
858 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
859 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
862 config PHYSICAL_ALIGN
864 default "0x04000000" if FSL_BOOKE
866 This value puts the alignment restrictions on physical address
867 where kernel is loaded and run from. Kernel is compiled for an
868 address which meets above alignment restriction.
870 config TASK_SIZE_BOOL
871 bool "Set custom user task size"
872 depends on ADVANCED_OPTIONS
874 This option allows you to set the amount of virtual address space
875 allocated to user tasks. This can be useful in optimizing the
876 virtual memory layout of the system.
878 Say N here unless you know what you are doing.
881 hex "Size of user task space" if TASK_SIZE_BOOL
882 default "0x80000000" if PPC_PREP || PPC_8xx
885 config CONSISTENT_SIZE_BOOL
886 bool "Set custom consistent memory pool size"
887 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
889 This option allows you to set the size of the
890 consistent memory pool. This pool of virtual memory
891 is used to make consistent memory allocations.
893 config CONSISTENT_SIZE
894 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
895 default "0x00200000" if NOT_COHERENT_CACHE
898 bool "Pinned Kernel TLBs (860 ONLY)"
899 depends on ADVANCED_OPTIONS && 8xx
904 bool "Build a relocatable kernel"
906 This builds a kernel image that is capable of running anywhere
907 in the RMA (real memory area) at any 16k-aligned base address.
908 The kernel is linked as a position-independent executable (PIE)
909 and contains dynamic relocations which are processed early
910 in the bootup process.
912 One use is for the kexec on panic case where the recovery kernel
913 must live at a different physical address than the primary
918 default "0xc000000000000000"
921 default "0xc000000000000000"
922 config PHYSICAL_START
929 source "drivers/Kconfig"
933 source "arch/powerpc/sysdev/qe_lib/Kconfig"
937 source "arch/powerpc/Kconfig.debug"
939 source "security/Kconfig"
943 depends on COMPAT && KEYS
946 source "crypto/Kconfig"
956 source "arch/powerpc/kvm/Kconfig"