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 HAVE_SETUP_PER_CPU_AREA
52 config STACKTRACE_SUPPORT
56 config HAVE_LATENCYTOP_SUPPORT
59 config TRACE_IRQFLAGS_SUPPORT
64 config LOCKDEP_SUPPORT
68 config RWSEM_GENERIC_SPINLOCK
71 config RWSEM_XCHGADD_ALGORITHM
75 config GENERIC_LOCKBREAK
78 depends on SMP && PREEMPT
80 config ARCH_HAS_ILOG2_U32
84 config ARCH_HAS_ILOG2_U64
88 config GENERIC_HWEIGHT
92 config GENERIC_CALIBRATE_DELAY
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
136 select COMPAT_BINFMT_ELF
138 config SYSVIPC_COMPAT
140 depends on COMPAT && SYSVIPC
143 # All PPC32s use generic nvram driver through ppc_md
148 config SCHED_OMIT_FRAME_POINTER
152 config ARCH_MAY_HAVE_PC_FDC
154 default !PPC_PSERIES || PCI
162 config PPC_UDBG_16550
166 config GENERIC_TBSYNC
168 default y if PPC32 && SMP
180 config SYS_SUPPORTS_APM_EMULATION
181 default y if PMAC_APM_EMU
188 config DEFAULT_UIMAGE
191 Used to allow a board to specify it wants a uImage built by default
199 depends on (PPC_PMAC && !SMP) || BROKEN
204 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
207 config ARCH_HIBERNATION_POSSIBLE
209 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
212 config ARCH_SUSPEND_POSSIBLE
214 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
216 config PPC_DCR_NATIVE
226 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
229 config PPC_OF_PLATFORM_PCI
232 depends on PPC64 # not supported on 32 bits yet
235 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
238 source "init/Kconfig"
240 source "kernel/Kconfig.freezer"
242 source "arch/powerpc/sysdev/Kconfig"
243 source "arch/powerpc/platforms/Kconfig"
245 menu "Kernel options"
248 bool "High memory support"
251 source kernel/time/Kconfig
252 source kernel/Kconfig.hz
253 source kernel/Kconfig.preempt
254 source "fs/Kconfig.binfmt"
256 config HUGETLB_PAGE_SIZE_VARIABLE
258 depends on HUGETLB_PAGE
261 config MATH_EMULATION
262 bool "Math emulation"
263 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
265 Some PowerPC chips designed for embedded applications do not have
266 a floating-point unit and therefore do not implement the
267 floating-point instructions in the PowerPC instruction set. If you
268 say Y here, the kernel will include code to emulate a floating-point
269 unit, which will allow programs that use floating-point
272 config 8XX_MINIMAL_FPEMU
273 bool "Minimal math emulation for 8xx"
274 depends on 8xx && !MATH_EMULATION
276 Older arch/ppc kernels still emulated a few floating point
277 instructions such as load and store, even when full math
278 emulation is disabled. Say "Y" here if you want to preserve
281 It is recommended that you build a soft-float userspace instead.
284 bool "Enable IOMMU virtual merging"
288 Cause IO segments sent to a device for DMA to be merged virtually
289 by the IOMMU when they happen to have been allocated contiguously.
290 This doesn't add pressure to the IOMMU allocator. However, some
291 drivers don't support getting large merged segments coming back
294 Most drivers don't have this problem; it is safe to say Y here.
299 config PPC_NEED_DMA_SYNC_OPS
301 depends on NOT_COHERENT_CACHE
304 bool "Support for enabling/disabling CPUs"
305 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
307 Say Y here to be able to disable and re-enable individual
308 CPUs at runtime on SMP machines.
310 Say N if you are unsure.
312 config ARCH_ENABLE_MEMORY_HOTPLUG
315 config ARCH_HAS_WALK_MEMORY
318 config ARCH_ENABLE_MEMORY_HOTREMOVE
322 bool "kexec system call (EXPERIMENTAL)"
323 depends on PPC_BOOK3S && EXPERIMENTAL
325 kexec is a system call that implements the ability to shutdown your
326 current kernel, and to start another kernel. It is like a reboot
327 but it is independent of the system firmware. And like a reboot
328 you can start any kernel with it, not just Linux.
330 The name comes from the similarity to the exec system call.
332 It is an ongoing process to be certain the hardware in a machine
333 is properly shutdown, so do not be surprised if this code does not
334 initially work for you. It may help to enable device hotplugging
335 support. As of this writing the exact hardware interface is
336 strongly in flux, so no good recommendation can be made.
339 bool "Build a kdump crash kernel"
340 depends on PPC64 || 6xx
341 select RELOCATABLE if PPC64
343 Build a kernel suitable for use as a kdump capture kernel.
344 The same kernel binary can be used as production kernel and dump
348 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
349 depends on PPC_PSERIES && EXPERIMENTAL
351 Hypervisor-assisted dump is meant to be a kdump replacement
352 offering robustness and speed not possible without system
353 hypervisor assistance.
358 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
359 default y if PPC_PREP
362 bool "Distribute interrupts on all CPUs by default"
363 depends on SMP && !MV64360
365 This option gives the kernel permission to distribute IRQs across
366 multiple CPUs. Saying N here will route all IRQs to the first
367 CPU. Generally saying Y is safe, although some problems have been
368 reported with SMP Power Macintoshes with this option enabled.
373 default y if SMP && PPC_PSERIES
378 depends on NEED_MULTIPLE_NODES
380 config ARCH_SELECT_MEMORY_MODEL
384 config ARCH_FLATMEM_ENABLE
386 depends on (PPC64 && !NUMA) || PPC32
388 config ARCH_SPARSEMEM_ENABLE
391 select SPARSEMEM_VMEMMAP_ENABLE
393 config ARCH_SPARSEMEM_DEFAULT
395 depends on (SMP && PPC_PSERIES) || PPC_PS3
397 config ARCH_POPULATES_NODE_MAP
402 config ARCH_MEMORY_PROBE
404 depends on MEMORY_HOTPLUG
406 # Some NUMA nodes have memory ranges that span
407 # other nodes. Even though a pfn is valid and
408 # between a node's start and end pfns, it may not
409 # reside on that node. See memmap_init_zone()
411 config NODES_SPAN_OTHER_NODES
413 depends on NEED_MULTIPLE_NODES
415 config PPC_HAS_HASH_64K
421 bool "Using standard binutils settings"
425 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
426 Note, that kernel will be able to run only those applications,
427 which had been compiled using binutils later than 2.17.50.0.3 with
428 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
429 the older binutils, you can patch them with a trivial patch, which
430 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
436 Select the kernel logical page size. Increasing the page size
437 will reduce software overhead at each page boundary, allow
438 hardware prefetch mechanisms to be more effective, and allow
439 larger dma transfers increasing IO efficiency and reducing
440 overhead. However the utilization of memory will increase.
441 For example, each cached file will using a multiple of the
442 page size to hold its contents and the difference between the
443 end of file and the end of page is wasted.
445 Some dedicated systems, such as software raid serving with
446 accelerated calculations, have shown significant increases.
448 If you configure a 64 bit kernel for 64k pages but the
449 processor does not support them, then the kernel will simulate
450 them with 4k pages, loading them on demand, but with the
451 reduced software overhead and larger internal fragmentation.
452 For the 32 bit kernel, a large page option will not be offered
453 unless it is supported by the configured processor.
455 If unsure, choose 4K_PAGES.
461 bool "16k page size" if 44x
464 bool "64k page size" if 44x || PPC_STD_MMU_64
465 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
467 config PPC_256K_PAGES
468 bool "256k page size" if 44x
469 depends on !STDBINUTILS
471 Make the page size 256k.
473 As the ELF standard only requires alignment to support page
474 sizes up to 64k, you will need to compile all of your user
475 space applications with a non-standard binutils settings
476 (see the STDBINUTILS description for details).
478 Say N unless you know what you are doing.
482 config FORCE_MAX_ZONEORDER
483 int "Maximum zone order"
484 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
485 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
486 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
487 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
488 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
489 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
490 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
491 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
492 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
493 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
497 The kernel memory allocator divides physically contiguous memory
498 blocks into "zones", where each zone is a power of two number of
499 pages. This option selects the largest power of two that the kernel
500 keeps in the memory allocator. If you need to allocate very large
501 blocks of physically contiguous memory, then you may need to
504 This config option is actually maximum order plus one. For example,
505 a value of 11 means that the largest free memory block is 2^10 pages.
507 The page size is not necessarily 4KB. For example, on 64-bit
508 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
509 this in mind when choosing a value for this option.
511 config PPC_SUBPAGE_PROT
512 bool "Support setting protections for 4k subpages"
513 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
515 This option adds support for a system call to allow user programs
516 to set access permissions (read/write, readonly, or no access)
517 on the 4k subpages of each 64k page.
520 bool "SMT (Hyperthreading) scheduler support"
521 depends on PPC64 && SMP
523 SMT scheduler support improves the CPU scheduler's decision making
524 when dealing with POWER5 cpus at a cost of slightly increased
525 overhead in some places. If unsure say N here.
527 config PROC_DEVICETREE
528 bool "Support for device tree in /proc"
531 This option adds a device-tree directory under /proc which contains
532 an image of the device tree that the kernel copies from Open
533 Firmware or other boot firmware. If unsure, say Y here.
536 bool "Default bootloader kernel arguments"
539 string "Initial kernel command string"
540 depends on CMDLINE_BOOL
541 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
543 On some platforms, there is currently no way for the boot loader to
544 pass arguments to the kernel. For these platforms, you can supply
545 some command-line options at build time by entering them here. In
546 most cases you will need to specify the root device here.
549 string "Additional default image types"
551 List additional targets to be built by the bootwrapper here (separated
552 by spaces). This is useful for targets that depend of device tree
553 files in the .dts directory.
555 Targets in this list will be build as part of the default build
556 target, or when the user does a 'make zImage' or a
557 'make zImage.initrd'.
559 If unsure, leave blank
562 config ARCH_WANTS_FREEZER_CONTROL
566 source kernel/power/Kconfig
570 bool "Enable seccomp to safely compute untrusted bytecode"
574 This kernel feature is useful for number crunching applications
575 that may need to compute untrusted bytecode during their
576 execution. By using pipes or other transports made available to
577 the process as file descriptors supporting the read/write
578 syscalls, it's possible to isolate those applications in
579 their own address space using seccomp. Once seccomp is
580 enabled via /proc/<pid>/seccomp, it cannot be disabled
581 and the task is only allowed to execute a few safe syscalls
582 defined by each seccomp mode.
584 If unsure, say Y. Only embedded should say N here.
590 default !PPC_ISERIES || PCI
595 bool "Support for ISA-bus hardware"
596 depends on PPC_PREP || PPC_CHRP
599 Find out whether you have ISA slots on your motherboard. ISA is the
600 name of a bus system, i.e. the way the CPU talks to the other stuff
601 inside your box. If you have an Apple machine, say N here; if you
602 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
603 you have an embedded board, consult your board documentation.
609 config GENERIC_ISA_DMA
611 depends on PPC64 || POWER4 || 6xx && !CPM2
614 config PPC_INDIRECT_PCI
617 default y if 40x || 44x
631 select PPC_INDIRECT_PCI
640 Freescale Localbus support
644 depends on PPC_83xx || QUICC_ENGINE || CPM2
646 Freescale General-purpose Timers support
648 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
652 # Platforms that what PCI turned unconditionally just do select PCI
653 # in their config node. Platforms that want to choose at config
654 # time should select PPC_PCI_CHOICE
655 config PPC_PCI_CHOICE
659 bool "PCI support" if PPC_PCI_CHOICE
660 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
661 && !PPC_85xx && !PPC_86xx
662 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
663 default PCI_QSPAN if !4xx && !CPM2 && 8xx
664 select ARCH_SUPPORTS_MSI
666 Find out whether your system includes a PCI bus. PCI is the name of
667 a bus system, i.e. the way the CPU talks to the other stuff inside
668 your box. If you say Y here, the kernel will include drivers and
669 infrastructure code to support PCI bus devices.
679 depends on !4xx && !CPM2 && 8xx
682 Say Y here if you have a system based on a Motorola 8xx-series
683 embedded processor with a QSPAN PCI interface, otherwise say N.
687 depends on PCI && 8260
688 select PPC_INDIRECT_PCI
692 bool "Enable workaround for MPC826x erratum PCI 9"
693 depends on PCI_8260 && !8272
697 prompt "IDMA channel for PCI 9 workaround"
700 config 8260_PCI9_IDMA1
703 config 8260_PCI9_IDMA2
706 config 8260_PCI9_IDMA3
709 config 8260_PCI9_IDMA4
714 source "drivers/pci/pcie/Kconfig"
716 source "drivers/pci/Kconfig"
718 source "drivers/pcmcia/Kconfig"
720 source "drivers/pci/hotplug/Kconfig"
727 bool "RapidIO support"
728 depends on HAS_RAPIDIO
730 If you say Y here, the kernel will include drivers and
731 infrastructure code to support RapidIO interconnect devices.
733 source "drivers/rapidio/Kconfig"
737 menu "Advanced setup"
740 config ADVANCED_OPTIONS
741 bool "Prompt for advanced kernel configuration options"
743 This option will enable prompting for a variety of advanced kernel
744 configuration options. These options can cause the kernel to not
745 work if they are set incorrectly, but can be used to optimize certain
746 aspects of kernel memory management.
748 Unless you know what you are doing, say N here.
750 comment "Default settings for advanced configuration options are used"
751 depends on !ADVANCED_OPTIONS
753 config LOWMEM_SIZE_BOOL
754 bool "Set maximum low memory"
755 depends on ADVANCED_OPTIONS
757 This option allows you to set the maximum amount of memory which
758 will be used as "low memory", that is, memory which the kernel can
759 access directly, without having to set up a kernel virtual mapping.
760 This can be useful in optimizing the layout of kernel virtual
763 Say N here unless you know what you are doing.
766 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
769 config LOWMEM_CAM_NUM_BOOL
770 bool "Set number of CAMs to use to map low memory"
771 depends on ADVANCED_OPTIONS && FSL_BOOKE
773 This option allows you to set the maximum number of CAM slots that
774 will be used to map low memory. There are a limited number of slots
775 available and even more limited number that will fit in the L1 MMU.
776 However, using more entries will allow mapping more low memory. This
777 can be useful in optimizing the layout of kernel virtual memory.
779 Say N here unless you know what you are doing.
781 config LOWMEM_CAM_NUM
783 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
787 bool "Build a relocatable kernel (EXPERIMENTAL)"
788 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
790 This builds a kernel image that is capable of running at the
791 location the kernel is loaded at (some alignment restrictions may
794 One use is for the kexec on panic case where the recovery kernel
795 must live at a different physical address than the primary
798 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
799 it has been loaded at and the compile time physical addresses
800 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
801 setting can still be useful to bootwrappers that need to know the
802 load location of the kernel (eg. u-boot/mkimage).
804 config PAGE_OFFSET_BOOL
805 bool "Set custom page offset address"
806 depends on ADVANCED_OPTIONS
808 This option allows you to set the kernel virtual address at which
809 the kernel will map low memory. This can be useful in optimizing
810 the virtual memory layout of the system.
812 Say N here unless you know what you are doing.
815 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
818 config KERNEL_START_BOOL
819 bool "Set custom kernel base address"
820 depends on ADVANCED_OPTIONS
822 This option allows you to set the kernel virtual address at which
823 the kernel will be loaded. Normally this should match PAGE_OFFSET
824 however there are times (like kdump) that one might not want them
827 Say N here unless you know what you are doing.
830 hex "Virtual address of kernel base" if KERNEL_START_BOOL
831 default PAGE_OFFSET if PAGE_OFFSET_BOOL
832 default "0xc2000000" if CRASH_DUMP
835 config PHYSICAL_START_BOOL
836 bool "Set physical address where the kernel is loaded"
837 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
839 This gives the physical address where the kernel is loaded.
841 Say N here unless you know what you are doing.
843 config PHYSICAL_START
844 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
845 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
848 config PHYSICAL_ALIGN
850 default "0x04000000" if FSL_BOOKE
852 This value puts the alignment restrictions on physical address
853 where kernel is loaded and run from. Kernel is compiled for an
854 address which meets above alignment restriction.
856 config TASK_SIZE_BOOL
857 bool "Set custom user task size"
858 depends on ADVANCED_OPTIONS
860 This option allows you to set the amount of virtual address space
861 allocated to user tasks. This can be useful in optimizing the
862 virtual memory layout of the system.
864 Say N here unless you know what you are doing.
867 hex "Size of user task space" if TASK_SIZE_BOOL
868 default "0x80000000" if PPC_PREP || PPC_8xx
872 bool "Pinned Kernel TLBs (860 ONLY)"
873 depends on ADVANCED_OPTIONS && 8xx
878 bool "Build a relocatable kernel"
880 This builds a kernel image that is capable of running anywhere
881 in the RMA (real memory area) at any 16k-aligned base address.
882 The kernel is linked as a position-independent executable (PIE)
883 and contains dynamic relocations which are processed early
884 in the bootup process.
886 One use is for the kexec on panic case where the recovery kernel
887 must live at a different physical address than the primary
892 default "0xc000000000000000"
895 default "0xc000000000000000"
896 config PHYSICAL_START
903 source "drivers/Kconfig"
907 source "arch/powerpc/sysdev/qe_lib/Kconfig"
911 source "arch/powerpc/Kconfig.debug"
913 source "security/Kconfig"
917 depends on COMPAT && KEYS
920 source "crypto/Kconfig"
930 source "arch/powerpc/kvm/Kconfig"