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 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
135 select COMPAT_BINFMT_ELF
137 config SYSVIPC_COMPAT
139 depends on COMPAT && SYSVIPC
142 # All PPC32s use generic nvram driver through ppc_md
147 config SCHED_OMIT_FRAME_POINTER
151 config ARCH_MAY_HAVE_PC_FDC
153 default !PPC_PSERIES || PCI
161 config PPC_UDBG_16550
165 config GENERIC_TBSYNC
167 default y if PPC32 && SMP
179 config SYS_SUPPORTS_APM_EMULATION
180 default y if PMAC_APM_EMU
183 config DEFAULT_UIMAGE
186 Used to allow a board to specify it wants a uImage built by default
194 depends on (PPC_PMAC && !SMP) || BROKEN
199 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
202 config ARCH_HIBERNATION_POSSIBLE
204 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
207 config ARCH_SUSPEND_POSSIBLE
209 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
211 config PPC_DCR_NATIVE
221 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
224 config PPC_OF_PLATFORM_PCI
227 depends on PPC64 # not supported on 32 bits yet
230 source "init/Kconfig"
232 source "kernel/Kconfig.freezer"
234 source "arch/powerpc/sysdev/Kconfig"
235 source "arch/powerpc/platforms/Kconfig"
237 menu "Kernel options"
240 bool "High memory support"
243 source kernel/time/Kconfig
244 source kernel/Kconfig.hz
245 source kernel/Kconfig.preempt
246 source "fs/Kconfig.binfmt"
248 config HUGETLB_PAGE_SIZE_VARIABLE
250 depends on HUGETLB_PAGE
253 config MATH_EMULATION
254 bool "Math emulation"
255 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
257 Some PowerPC chips designed for embedded applications do not have
258 a floating-point unit and therefore do not implement the
259 floating-point instructions in the PowerPC instruction set. If you
260 say Y here, the kernel will include code to emulate a floating-point
261 unit, which will allow programs that use floating-point
264 config 8XX_MINIMAL_FPEMU
265 bool "Minimal math emulation for 8xx"
266 depends on 8xx && !MATH_EMULATION
268 Older arch/ppc kernels still emulated a few floating point
269 instructions such as load and store, even when full math
270 emulation is disabled. Say "Y" here if you want to preserve
273 It is recommended that you build a soft-float userspace instead.
276 bool "Enable IOMMU virtual merging"
280 Cause IO segments sent to a device for DMA to be merged virtually
281 by the IOMMU when they happen to have been allocated contiguously.
282 This doesn't add pressure to the IOMMU allocator. However, some
283 drivers don't support getting large merged segments coming back
286 Most drivers don't have this problem; it is safe to say Y here.
291 config PPC_NEED_DMA_SYNC_OPS
293 depends on NOT_COHERENT_CACHE
296 bool "Support for enabling/disabling CPUs"
297 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
299 Say Y here to be able to disable and re-enable individual
300 CPUs at runtime on SMP machines.
302 Say N if you are unsure.
304 config ARCH_ENABLE_MEMORY_HOTPLUG
307 config ARCH_HAS_WALK_MEMORY
310 config ARCH_ENABLE_MEMORY_HOTREMOVE
314 bool "kexec system call (EXPERIMENTAL)"
315 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
317 kexec is a system call that implements the ability to shutdown your
318 current kernel, and to start another kernel. It is like a reboot
319 but it is independent of the system firmware. And like a reboot
320 you can start any kernel with it, not just Linux.
322 The name comes from the similarity to the exec system call.
324 It is an ongoing process to be certain the hardware in a machine
325 is properly shutdown, so do not be surprised if this code does not
326 initially work for you. It may help to enable device hotplugging
327 support. As of this writing the exact hardware interface is
328 strongly in flux, so no good recommendation can be made.
331 bool "Build a kdump crash kernel"
332 depends on PPC64 || 6xx
333 select RELOCATABLE if PPC64
335 Build a kernel suitable for use as a kdump capture kernel.
336 The same kernel binary can be used as production kernel and dump
340 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
341 depends on PPC_PSERIES && EXPERIMENTAL
343 Hypervisor-assisted dump is meant to be a kdump replacement
344 offering robustness and speed not possible without system
345 hypervisor assistence.
350 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
351 default y if PPC_PREP
354 bool "Distribute interrupts on all CPUs by default"
355 depends on SMP && !MV64360
357 This option gives the kernel permission to distribute IRQs across
358 multiple CPUs. Saying N here will route all IRQs to the first
359 CPU. Generally saying Y is safe, although some problems have been
360 reported with SMP Power Macintoshes with this option enabled.
365 default y if SMP && PPC_PSERIES
370 depends on NEED_MULTIPLE_NODES
372 config ARCH_SELECT_MEMORY_MODEL
376 config ARCH_FLATMEM_ENABLE
378 depends on (PPC64 && !NUMA) || PPC32
380 config ARCH_SPARSEMEM_ENABLE
383 select SPARSEMEM_VMEMMAP_ENABLE
385 config ARCH_SPARSEMEM_DEFAULT
387 depends on (SMP && PPC_PSERIES) || PPC_PS3
389 config ARCH_POPULATES_NODE_MAP
394 config ARCH_MEMORY_PROBE
396 depends on MEMORY_HOTPLUG
398 # Some NUMA nodes have memory ranges that span
399 # other nodes. Even though a pfn is valid and
400 # between a node's start and end pfns, it may not
401 # reside on that node. See memmap_init_zone()
403 config NODES_SPAN_OTHER_NODES
405 depends on NEED_MULTIPLE_NODES
407 config PPC_HAS_HASH_64K
413 bool "Using standard binutils settings"
417 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
418 Note, that kernel will be able to run only those applications,
419 which had been compiled using binutils later than 2.17.50.0.3 with
420 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
421 the older binutils, you can patch them with a trivial patch, which
422 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
428 Select the kernel logical page size. Increasing the page size
429 will reduce software overhead at each page boundary, allow
430 hardware prefetch mechanisms to be more effective, and allow
431 larger dma transfers increasing IO efficiency and reducing
432 overhead. However the utilization of memory will increase.
433 For example, each cached file will using a multiple of the
434 page size to hold its contents and the difference between the
435 end of file and the end of page is wasted.
437 Some dedicated systems, such as software raid serving with
438 accelerated calculations, have shown significant increases.
440 If you configure a 64 bit kernel for 64k pages but the
441 processor does not support them, then the kernel will simulate
442 them with 4k pages, loading them on demand, but with the
443 reduced software overhead and larger internal fragmentation.
444 For the 32 bit kernel, a large page option will not be offered
445 unless it is supported by the configured processor.
447 If unsure, choose 4K_PAGES.
453 bool "16k page size" if 44x
456 bool "64k page size" if 44x || PPC_STD_MMU_64
457 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
459 config PPC_256K_PAGES
460 bool "256k page size" if 44x
461 depends on !STDBINUTILS && (!SHMEM || BROKEN)
463 Make the page size 256k.
465 As the ELF standard only requires alignment to support page
466 sizes up to 64k, you will need to compile all of your user
467 space applications with a non-standard binutils settings
468 (see the STDBINUTILS description for details).
470 Say N unless you know what you are doing.
474 config FORCE_MAX_ZONEORDER
475 int "Maximum zone order"
476 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
477 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
478 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
479 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
480 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
481 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
482 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
483 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
484 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
485 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
489 The kernel memory allocator divides physically contiguous memory
490 blocks into "zones", where each zone is a power of two number of
491 pages. This option selects the largest power of two that the kernel
492 keeps in the memory allocator. If you need to allocate very large
493 blocks of physically contiguous memory, then you may need to
496 This config option is actually maximum order plus one. For example,
497 a value of 11 means that the largest free memory block is 2^10 pages.
499 The page size is not necessarily 4KB. For example, on 64-bit
500 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
501 this in mind when choosing a value for this option.
503 config PPC_SUBPAGE_PROT
504 bool "Support setting protections for 4k subpages"
505 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
507 This option adds support for a system call to allow user programs
508 to set access permissions (read/write, readonly, or no access)
509 on the 4k subpages of each 64k page.
512 bool "SMT (Hyperthreading) scheduler support"
513 depends on PPC64 && SMP
515 SMT scheduler support improves the CPU scheduler's decision making
516 when dealing with POWER5 cpus at a cost of slightly increased
517 overhead in some places. If unsure say N here.
519 config PROC_DEVICETREE
520 bool "Support for device tree in /proc"
523 This option adds a device-tree directory under /proc which contains
524 an image of the device tree that the kernel copies from Open
525 Firmware or other boot firmware. If unsure, say Y here.
528 bool "Default bootloader kernel arguments"
531 string "Initial kernel command string"
532 depends on CMDLINE_BOOL
533 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
535 On some platforms, there is currently no way for the boot loader to
536 pass arguments to the kernel. For these platforms, you can supply
537 some command-line options at build time by entering them here. In
538 most cases you will need to specify the root device here.
541 string "Additional default image types"
543 List additional targets to be built by the bootwrapper here (separated
544 by spaces). This is useful for targets that depend of device tree
545 files in the .dts directory.
547 Targets in this list will be build as part of the default build
548 target, or when the user does a 'make zImage' or a
549 'make zImage.initrd'.
551 If unsure, leave blank
554 config ARCH_WANTS_FREEZER_CONTROL
558 source kernel/power/Kconfig
562 bool "Enable seccomp to safely compute untrusted bytecode"
566 This kernel feature is useful for number crunching applications
567 that may need to compute untrusted bytecode during their
568 execution. By using pipes or other transports made available to
569 the process as file descriptors supporting the read/write
570 syscalls, it's possible to isolate those applications in
571 their own address space using seccomp. Once seccomp is
572 enabled via /proc/<pid>/seccomp, it cannot be disabled
573 and the task is only allowed to execute a few safe syscalls
574 defined by each seccomp mode.
576 If unsure, say Y. Only embedded should say N here.
582 default !PPC_ISERIES || PCI
587 bool "Support for ISA-bus hardware"
588 depends on PPC_PREP || PPC_CHRP
591 Find out whether you have ISA slots on your motherboard. ISA is the
592 name of a bus system, i.e. the way the CPU talks to the other stuff
593 inside your box. If you have an Apple machine, say N here; if you
594 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
595 you have an embedded board, consult your board documentation.
601 config GENERIC_ISA_DMA
603 depends on PPC64 || POWER4 || 6xx && !CPM2
606 config PPC_INDIRECT_PCI
609 default y if 40x || 44x
623 select PPC_INDIRECT_PCI
632 Freescale Localbus support
636 depends on PPC_83xx || QUICC_ENGINE || CPM2
638 Freescale General-purpose Timers support
640 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
644 # Platforms that what PCI turned unconditionally just do select PCI
645 # in their config node. Platforms that want to choose at config
646 # time should select PPC_PCI_CHOICE
647 config PPC_PCI_CHOICE
651 bool "PCI support" if PPC_PCI_CHOICE
652 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
653 && !PPC_85xx && !PPC_86xx
654 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
655 default PCI_QSPAN if !4xx && !CPM2 && 8xx
656 select ARCH_SUPPORTS_MSI
658 Find out whether your system includes a PCI bus. PCI is the name of
659 a bus system, i.e. the way the CPU talks to the other stuff inside
660 your box. If you say Y here, the kernel will include drivers and
661 infrastructure code to support PCI bus devices.
671 depends on !4xx && !CPM2 && 8xx
674 Say Y here if you have a system based on a Motorola 8xx-series
675 embedded processor with a QSPAN PCI interface, otherwise say N.
679 depends on PCI && 8260
680 select PPC_INDIRECT_PCI
684 bool "Enable workaround for MPC826x erratum PCI 9"
685 depends on PCI_8260 && !8272
689 prompt "IDMA channel for PCI 9 workaround"
692 config 8260_PCI9_IDMA1
695 config 8260_PCI9_IDMA2
698 config 8260_PCI9_IDMA3
701 config 8260_PCI9_IDMA4
706 source "drivers/pci/pcie/Kconfig"
708 source "drivers/pci/Kconfig"
710 source "drivers/pcmcia/Kconfig"
712 source "drivers/pci/hotplug/Kconfig"
719 bool "RapidIO support"
720 depends on HAS_RAPIDIO
722 If you say Y here, the kernel will include drivers and
723 infrastructure code to support RapidIO interconnect devices.
725 source "drivers/rapidio/Kconfig"
729 menu "Advanced setup"
732 config ADVANCED_OPTIONS
733 bool "Prompt for advanced kernel configuration options"
735 This option will enable prompting for a variety of advanced kernel
736 configuration options. These options can cause the kernel to not
737 work if they are set incorrectly, but can be used to optimize certain
738 aspects of kernel memory management.
740 Unless you know what you are doing, say N here.
742 comment "Default settings for advanced configuration options are used"
743 depends on !ADVANCED_OPTIONS
745 config LOWMEM_SIZE_BOOL
746 bool "Set maximum low memory"
747 depends on ADVANCED_OPTIONS
749 This option allows you to set the maximum amount of memory which
750 will be used as "low memory", that is, memory which the kernel can
751 access directly, without having to set up a kernel virtual mapping.
752 This can be useful in optimizing the layout of kernel virtual
755 Say N here unless you know what you are doing.
758 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
761 config LOWMEM_CAM_NUM_BOOL
762 bool "Set number of CAMs to use to map low memory"
763 depends on ADVANCED_OPTIONS && FSL_BOOKE
765 This option allows you to set the maximum number of CAM slots that
766 will be used to map low memory. There are a limited number of slots
767 available and even more limited number that will fit in the L1 MMU.
768 However, using more entries will allow mapping more low memory. This
769 can be useful in optimizing the layout of kernel virtual memory.
771 Say N here unless you know what you are doing.
773 config LOWMEM_CAM_NUM
774 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
778 bool "Build a relocatable kernel (EXPERIMENTAL)"
779 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
781 This builds a kernel image that is capable of running at the
782 location the kernel is loaded at (some alignment restrictions may
785 One use is for the kexec on panic case where the recovery kernel
786 must live at a different physical address than the primary
789 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
790 it has been loaded at and the compile time physical addresses
791 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
792 setting can still be useful to bootwrappers that need to know the
793 load location of the kernel (eg. u-boot/mkimage).
795 config PAGE_OFFSET_BOOL
796 bool "Set custom page offset address"
797 depends on ADVANCED_OPTIONS
799 This option allows you to set the kernel virtual address at which
800 the kernel will map low memory. This can be useful in optimizing
801 the virtual memory layout of the system.
803 Say N here unless you know what you are doing.
806 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
809 config KERNEL_START_BOOL
810 bool "Set custom kernel base address"
811 depends on ADVANCED_OPTIONS
813 This option allows you to set the kernel virtual address at which
814 the kernel will be loaded. Normally this should match PAGE_OFFSET
815 however there are times (like kdump) that one might not want them
818 Say N here unless you know what you are doing.
821 hex "Virtual address of kernel base" if KERNEL_START_BOOL
822 default PAGE_OFFSET if PAGE_OFFSET_BOOL
823 default "0xc2000000" if CRASH_DUMP
826 config PHYSICAL_START_BOOL
827 bool "Set physical address where the kernel is loaded"
828 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
830 This gives the physical address where the kernel is loaded.
832 Say N here unless you know what you are doing.
834 config PHYSICAL_START
835 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
836 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
839 config PHYSICAL_ALIGN
841 default "0x04000000" if FSL_BOOKE
843 This value puts the alignment restrictions on physical address
844 where kernel is loaded and run from. Kernel is compiled for an
845 address which meets above alignment restriction.
847 config TASK_SIZE_BOOL
848 bool "Set custom user task size"
849 depends on ADVANCED_OPTIONS
851 This option allows you to set the amount of virtual address space
852 allocated to user tasks. This can be useful in optimizing the
853 virtual memory layout of the system.
855 Say N here unless you know what you are doing.
858 hex "Size of user task space" if TASK_SIZE_BOOL
859 default "0x80000000" if PPC_PREP || PPC_8xx
862 config CONSISTENT_START_BOOL
863 bool "Set custom consistent memory pool address"
864 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
866 This option allows you to set the base virtual address
867 of the consistent memory pool. This pool of virtual
868 memory is used to make consistent memory allocations.
870 config CONSISTENT_START
871 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
872 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
873 default "0xff100000" if NOT_COHERENT_CACHE
875 config CONSISTENT_SIZE_BOOL
876 bool "Set custom consistent memory pool size"
877 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
879 This option allows you to set the size of the
880 consistent memory pool. This pool of virtual memory
881 is used to make consistent memory allocations.
883 config CONSISTENT_SIZE
884 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
885 default "0x00200000" if NOT_COHERENT_CACHE
888 bool "Pinned Kernel TLBs (860 ONLY)"
889 depends on ADVANCED_OPTIONS && 8xx
894 bool "Build a relocatable kernel"
896 This builds a kernel image that is capable of running anywhere
897 in the RMA (real memory area) at any 16k-aligned base address.
898 The kernel is linked as a position-independent executable (PIE)
899 and contains dynamic relocations which are processed early
900 in the bootup process.
902 One use is for the kexec on panic case where the recovery kernel
903 must live at a different physical address than the primary
908 default "0xc000000000000000"
911 default "0xc000000000000000"
912 config PHYSICAL_START
919 source "drivers/Kconfig"
923 source "arch/powerpc/sysdev/qe_lib/Kconfig"
927 source "arch/powerpc/Kconfig.debug"
929 source "security/Kconfig"
933 depends on COMPAT && KEYS
936 source "crypto/Kconfig"
946 source "arch/powerpc/kvm/Kconfig"