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
416 Select the kernel logical page size. Increasing the page size
417 will reduce software overhead at each page boundary, allow
418 hardware prefetch mechanisms to be more effective, and allow
419 larger dma transfers increasing IO efficiency and reducing
420 overhead. However the utilization of memory will increase.
421 For example, each cached file will using a multiple of the
422 page size to hold its contents and the difference between the
423 end of file and the end of page is wasted.
425 Some dedicated systems, such as software raid serving with
426 accelerated calculations, have shown significant increases.
428 If you configure a 64 bit kernel for 64k pages but the
429 processor does not support them, then the kernel will simulate
430 them with 4k pages, loading them on demand, but with the
431 reduced software overhead and larger internal fragmentation.
432 For the 32 bit kernel, a large page option will not be offered
433 unless it is supported by the configured processor.
435 If unsure, choose 4K_PAGES.
441 bool "16k page size" if 44x
444 bool "64k page size" if 44x || PPC_STD_MMU_64
445 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
449 config FORCE_MAX_ZONEORDER
450 int "Maximum zone order"
451 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
452 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
453 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
454 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
455 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
456 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
457 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
458 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
462 The kernel memory allocator divides physically contiguous memory
463 blocks into "zones", where each zone is a power of two number of
464 pages. This option selects the largest power of two that the kernel
465 keeps in the memory allocator. If you need to allocate very large
466 blocks of physically contiguous memory, then you may need to
469 This config option is actually maximum order plus one. For example,
470 a value of 11 means that the largest free memory block is 2^10 pages.
472 The page size is not necessarily 4KB. For example, on 64-bit
473 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
474 this in mind when choosing a value for this option.
476 config PPC_SUBPAGE_PROT
477 bool "Support setting protections for 4k subpages"
478 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
480 This option adds support for a system call to allow user programs
481 to set access permissions (read/write, readonly, or no access)
482 on the 4k subpages of each 64k page.
485 bool "SMT (Hyperthreading) scheduler support"
486 depends on PPC64 && SMP
488 SMT scheduler support improves the CPU scheduler's decision making
489 when dealing with POWER5 cpus at a cost of slightly increased
490 overhead in some places. If unsure say N here.
492 config PROC_DEVICETREE
493 bool "Support for device tree in /proc"
496 This option adds a device-tree directory under /proc which contains
497 an image of the device tree that the kernel copies from Open
498 Firmware or other boot firmware. If unsure, say Y here.
501 bool "Default bootloader kernel arguments"
504 string "Initial kernel command string"
505 depends on CMDLINE_BOOL
506 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
508 On some platforms, there is currently no way for the boot loader to
509 pass arguments to the kernel. For these platforms, you can supply
510 some command-line options at build time by entering them here. In
511 most cases you will need to specify the root device here.
514 string "Additional default image types"
516 List additional targets to be built by the bootwrapper here (separated
517 by spaces). This is useful for targets that depend of device tree
518 files in the .dts directory.
520 Targets in this list will be build as part of the default build
521 target, or when the user does a 'make zImage' or a
522 'make zImage.initrd'.
524 If unsure, leave blank
527 config ARCH_WANTS_FREEZER_CONTROL
531 source kernel/power/Kconfig
535 bool "Enable seccomp to safely compute untrusted bytecode"
539 This kernel feature is useful for number crunching applications
540 that may need to compute untrusted bytecode during their
541 execution. By using pipes or other transports made available to
542 the process as file descriptors supporting the read/write
543 syscalls, it's possible to isolate those applications in
544 their own address space using seccomp. Once seccomp is
545 enabled via /proc/<pid>/seccomp, it cannot be disabled
546 and the task is only allowed to execute a few safe syscalls
547 defined by each seccomp mode.
549 If unsure, say Y. Only embedded should say N here.
555 default !PPC_ISERIES || PCI
560 bool "Support for ISA-bus hardware"
561 depends on PPC_PREP || PPC_CHRP
564 Find out whether you have ISA slots on your motherboard. ISA is the
565 name of a bus system, i.e. the way the CPU talks to the other stuff
566 inside your box. If you have an Apple machine, say N here; if you
567 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
568 you have an embedded board, consult your board documentation.
574 config GENERIC_ISA_DMA
576 depends on PPC64 || POWER4 || 6xx && !CPM2
579 config PPC_INDIRECT_PCI
582 default y if 40x || 44x
596 select PPC_INDIRECT_PCI
605 Freescale Localbus support
609 depends on PPC_83xx || QUICC_ENGINE || CPM2
611 Freescale General-purpose Timers support
613 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
617 # Platforms that what PCI turned unconditionally just do select PCI
618 # in their config node. Platforms that want to choose at config
619 # time should select PPC_PCI_CHOICE
620 config PPC_PCI_CHOICE
624 bool "PCI support" if PPC_PCI_CHOICE
625 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
626 && !PPC_85xx && !PPC_86xx
627 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
628 default PCI_QSPAN if !4xx && !CPM2 && 8xx
629 select ARCH_SUPPORTS_MSI
631 Find out whether your system includes a PCI bus. PCI is the name of
632 a bus system, i.e. the way the CPU talks to the other stuff inside
633 your box. If you say Y here, the kernel will include drivers and
634 infrastructure code to support PCI bus devices.
644 depends on !4xx && !CPM2 && 8xx
647 Say Y here if you have a system based on a Motorola 8xx-series
648 embedded processor with a QSPAN PCI interface, otherwise say N.
652 depends on PCI && 8260
653 select PPC_INDIRECT_PCI
657 bool "Enable workaround for MPC826x erratum PCI 9"
658 depends on PCI_8260 && !8272
662 prompt "IDMA channel for PCI 9 workaround"
665 config 8260_PCI9_IDMA1
668 config 8260_PCI9_IDMA2
671 config 8260_PCI9_IDMA3
674 config 8260_PCI9_IDMA4
679 source "drivers/pci/pcie/Kconfig"
681 source "drivers/pci/Kconfig"
683 source "drivers/pcmcia/Kconfig"
685 source "drivers/pci/hotplug/Kconfig"
692 bool "RapidIO support"
693 depends on HAS_RAPIDIO
695 If you say Y here, the kernel will include drivers and
696 infrastructure code to support RapidIO interconnect devices.
698 source "drivers/rapidio/Kconfig"
702 menu "Advanced setup"
705 config ADVANCED_OPTIONS
706 bool "Prompt for advanced kernel configuration options"
708 This option will enable prompting for a variety of advanced kernel
709 configuration options. These options can cause the kernel to not
710 work if they are set incorrectly, but can be used to optimize certain
711 aspects of kernel memory management.
713 Unless you know what you are doing, say N here.
715 comment "Default settings for advanced configuration options are used"
716 depends on !ADVANCED_OPTIONS
718 config LOWMEM_SIZE_BOOL
719 bool "Set maximum low memory"
720 depends on ADVANCED_OPTIONS
722 This option allows you to set the maximum amount of memory which
723 will be used as "low memory", that is, memory which the kernel can
724 access directly, without having to set up a kernel virtual mapping.
725 This can be useful in optimizing the layout of kernel virtual
728 Say N here unless you know what you are doing.
731 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
734 config LOWMEM_CAM_NUM_BOOL
735 bool "Set number of CAMs to use to map low memory"
736 depends on ADVANCED_OPTIONS && FSL_BOOKE
738 This option allows you to set the maximum number of CAM slots that
739 will be used to map low memory. There are a limited number of slots
740 available and even more limited number that will fit in the L1 MMU.
741 However, using more entries will allow mapping more low memory. This
742 can be useful in optimizing the layout of kernel virtual memory.
744 Say N here unless you know what you are doing.
746 config LOWMEM_CAM_NUM
747 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
751 bool "Build a relocatable kernel (EXPERIMENTAL)"
752 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
754 This builds a kernel image that is capable of running at the
755 location the kernel is loaded at (some alignment restrictions may
758 One use is for the kexec on panic case where the recovery kernel
759 must live at a different physical address than the primary
762 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
763 it has been loaded at and the compile time physical addresses
764 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
765 setting can still be useful to bootwrappers that need to know the
766 load location of the kernel (eg. u-boot/mkimage).
768 config PAGE_OFFSET_BOOL
769 bool "Set custom page offset address"
770 depends on ADVANCED_OPTIONS
772 This option allows you to set the kernel virtual address at which
773 the kernel will map low memory. This can be useful in optimizing
774 the virtual memory layout of the system.
776 Say N here unless you know what you are doing.
779 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
782 config KERNEL_START_BOOL
783 bool "Set custom kernel base address"
784 depends on ADVANCED_OPTIONS
786 This option allows you to set the kernel virtual address at which
787 the kernel will be loaded. Normally this should match PAGE_OFFSET
788 however there are times (like kdump) that one might not want them
791 Say N here unless you know what you are doing.
794 hex "Virtual address of kernel base" if KERNEL_START_BOOL
795 default PAGE_OFFSET if PAGE_OFFSET_BOOL
796 default "0xc2000000" if CRASH_DUMP
799 config PHYSICAL_START_BOOL
800 bool "Set physical address where the kernel is loaded"
801 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
803 This gives the physical address where the kernel is loaded.
805 Say N here unless you know what you are doing.
807 config PHYSICAL_START
808 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
809 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
812 config PHYSICAL_ALIGN
814 default "0x04000000" if FSL_BOOKE
816 This value puts the alignment restrictions on physical address
817 where kernel is loaded and run from. Kernel is compiled for an
818 address which meets above alignment restriction.
820 config TASK_SIZE_BOOL
821 bool "Set custom user task size"
822 depends on ADVANCED_OPTIONS
824 This option allows you to set the amount of virtual address space
825 allocated to user tasks. This can be useful in optimizing the
826 virtual memory layout of the system.
828 Say N here unless you know what you are doing.
831 hex "Size of user task space" if TASK_SIZE_BOOL
832 default "0x80000000" if PPC_PREP || PPC_8xx
835 config CONSISTENT_START_BOOL
836 bool "Set custom consistent memory pool address"
837 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
839 This option allows you to set the base virtual address
840 of the consistent memory pool. This pool of virtual
841 memory is used to make consistent memory allocations.
843 config CONSISTENT_START
844 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
845 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
846 default "0xff100000" if NOT_COHERENT_CACHE
848 config CONSISTENT_SIZE_BOOL
849 bool "Set custom consistent memory pool size"
850 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
852 This option allows you to set the size of the
853 consistent memory pool. This pool of virtual memory
854 is used to make consistent memory allocations.
856 config CONSISTENT_SIZE
857 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
858 default "0x00200000" if NOT_COHERENT_CACHE
861 bool "Pinned Kernel TLBs (860 ONLY)"
862 depends on ADVANCED_OPTIONS && 8xx
867 bool "Build a relocatable kernel"
869 This builds a kernel image that is capable of running anywhere
870 in the RMA (real memory area) at any 16k-aligned base address.
871 The kernel is linked as a position-independent executable (PIE)
872 and contains dynamic relocations which are processed early
873 in the bootup process.
875 One use is for the kexec on panic case where the recovery kernel
876 must live at a different physical address than the primary
881 default "0xc000000000000000"
884 default "0xc000000000000000"
885 config PHYSICAL_START
892 source "drivers/Kconfig"
896 source "arch/powerpc/sysdev/qe_lib/Kconfig"
900 source "arch/powerpc/Kconfig.debug"
902 source "security/Kconfig"
906 depends on COMPAT && KEYS
909 source "crypto/Kconfig"
919 source "arch/powerpc/kvm/Kconfig"