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
134 select COMPAT_BINFMT_ELF
136 config SYSVIPC_COMPAT
138 depends on COMPAT && SYSVIPC
141 # All PPC32s use generic nvram driver through ppc_md
146 config SCHED_OMIT_FRAME_POINTER
150 config ARCH_MAY_HAVE_PC_FDC
152 default !PPC_PSERIES || PCI
160 config PPC_UDBG_16550
164 config GENERIC_TBSYNC
166 default y if PPC32 && SMP
178 config SYS_SUPPORTS_APM_EMULATION
179 default y if PMAC_APM_EMU
182 config DEFAULT_UIMAGE
185 Used to allow a board to specify it wants a uImage built by default
193 depends on (PPC_PMAC && !SMP) || BROKEN
198 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
201 config ARCH_HIBERNATION_POSSIBLE
203 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
206 config ARCH_SUSPEND_POSSIBLE
208 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
210 config PPC_DCR_NATIVE
220 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
223 config PPC_OF_PLATFORM_PCI
226 depends on PPC64 # not supported on 32 bits yet
229 source "init/Kconfig"
231 source "kernel/Kconfig.freezer"
233 source "arch/powerpc/sysdev/Kconfig"
234 source "arch/powerpc/platforms/Kconfig"
236 menu "Kernel options"
239 bool "High memory support"
242 source kernel/time/Kconfig
243 source kernel/Kconfig.hz
244 source kernel/Kconfig.preempt
245 source "fs/Kconfig.binfmt"
247 config HUGETLB_PAGE_SIZE_VARIABLE
249 depends on HUGETLB_PAGE
252 config MATH_EMULATION
253 bool "Math emulation"
254 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
256 Some PowerPC chips designed for embedded applications do not have
257 a floating-point unit and therefore do not implement the
258 floating-point instructions in the PowerPC instruction set. If you
259 say Y here, the kernel will include code to emulate a floating-point
260 unit, which will allow programs that use floating-point
263 config 8XX_MINIMAL_FPEMU
264 bool "Minimal math emulation for 8xx"
265 depends on 8xx && !MATH_EMULATION
267 Older arch/ppc kernels still emulated a few floating point
268 instructions such as load and store, even when full math
269 emulation is disabled. Say "Y" here if you want to preserve
272 It is recommended that you build a soft-float userspace instead.
275 bool "Enable IOMMU virtual merging"
279 Cause IO segments sent to a device for DMA to be merged virtually
280 by the IOMMU when they happen to have been allocated contiguously.
281 This doesn't add pressure to the IOMMU allocator. However, some
282 drivers don't support getting large merged segments coming back
285 Most drivers don't have this problem; it is safe to say Y here.
290 config PPC_NEED_DMA_SYNC_OPS
292 depends on NOT_COHERENT_CACHE
295 bool "Support for enabling/disabling CPUs"
296 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
298 Say Y here to be able to disable and re-enable individual
299 CPUs at runtime on SMP machines.
301 Say N if you are unsure.
303 config ARCH_ENABLE_MEMORY_HOTPLUG
306 config ARCH_HAS_WALK_MEMORY
309 config ARCH_ENABLE_MEMORY_HOTREMOVE
313 bool "kexec system call (EXPERIMENTAL)"
314 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
316 kexec is a system call that implements the ability to shutdown your
317 current kernel, and to start another kernel. It is like a reboot
318 but it is independent of the system firmware. And like a reboot
319 you can start any kernel with it, not just Linux.
321 The name comes from the similarity to the exec system call.
323 It is an ongoing process to be certain the hardware in a machine
324 is properly shutdown, so do not be surprised if this code does not
325 initially work for you. It may help to enable device hotplugging
326 support. As of this writing the exact hardware interface is
327 strongly in flux, so no good recommendation can be made.
330 bool "Build a kdump crash kernel"
331 depends on PPC64 || 6xx
332 select RELOCATABLE if PPC64
334 Build a kernel suitable for use as a kdump capture kernel.
335 The same kernel binary can be used as production kernel and dump
339 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
340 depends on PPC_PSERIES && EXPERIMENTAL
342 Hypervisor-assisted dump is meant to be a kdump replacement
343 offering robustness and speed not possible without system
344 hypervisor assistence.
349 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
350 default y if PPC_PREP
353 bool "Distribute interrupts on all CPUs by default"
354 depends on SMP && !MV64360
356 This option gives the kernel permission to distribute IRQs across
357 multiple CPUs. Saying N here will route all IRQs to the first
358 CPU. Generally saying Y is safe, although some problems have been
359 reported with SMP Power Macintoshes with this option enabled.
364 default y if SMP && PPC_PSERIES
369 depends on NEED_MULTIPLE_NODES
371 config ARCH_SELECT_MEMORY_MODEL
375 config ARCH_FLATMEM_ENABLE
377 depends on (PPC64 && !NUMA) || PPC32
379 config ARCH_SPARSEMEM_ENABLE
382 select SPARSEMEM_VMEMMAP_ENABLE
384 config ARCH_SPARSEMEM_DEFAULT
386 depends on (SMP && PPC_PSERIES) || PPC_PS3
388 config ARCH_POPULATES_NODE_MAP
393 config ARCH_MEMORY_PROBE
395 depends on MEMORY_HOTPLUG
397 # Some NUMA nodes have memory ranges that span
398 # other nodes. Even though a pfn is valid and
399 # between a node's start and end pfns, it may not
400 # reside on that node. See memmap_init_zone()
402 config NODES_SPAN_OTHER_NODES
404 depends on NEED_MULTIPLE_NODES
406 config PPC_HAS_HASH_64K
415 Select the kernel logical page size. Increasing the page size
416 will reduce software overhead at each page boundary, allow
417 hardware prefetch mechanisms to be more effective, and allow
418 larger dma transfers increasing IO efficiency and reducing
419 overhead. However the utilization of memory will increase.
420 For example, each cached file will using a multiple of the
421 page size to hold its contents and the difference between the
422 end of file and the end of page is wasted.
424 Some dedicated systems, such as software raid serving with
425 accelerated calculations, have shown significant increases.
427 If you configure a 64 bit kernel for 64k pages but the
428 processor does not support them, then the kernel will simulate
429 them with 4k pages, loading them on demand, but with the
430 reduced software overhead and larger internal fragmentation.
431 For the 32 bit kernel, a large page option will not be offered
432 unless it is supported by the configured processor.
434 If unsure, choose 4K_PAGES.
440 bool "16k page size" if 44x
443 bool "64k page size" if 44x || PPC_STD_MMU_64
444 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
448 config FORCE_MAX_ZONEORDER
449 int "Maximum zone order"
450 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
451 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
452 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
453 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
454 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
455 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
456 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
457 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
461 The kernel memory allocator divides physically contiguous memory
462 blocks into "zones", where each zone is a power of two number of
463 pages. This option selects the largest power of two that the kernel
464 keeps in the memory allocator. If you need to allocate very large
465 blocks of physically contiguous memory, then you may need to
468 This config option is actually maximum order plus one. For example,
469 a value of 11 means that the largest free memory block is 2^10 pages.
471 The page size is not necessarily 4KB. For example, on 64-bit
472 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
473 this in mind when choosing a value for this option.
475 config PPC_SUBPAGE_PROT
476 bool "Support setting protections for 4k subpages"
477 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
479 This option adds support for a system call to allow user programs
480 to set access permissions (read/write, readonly, or no access)
481 on the 4k subpages of each 64k page.
484 bool "SMT (Hyperthreading) scheduler support"
485 depends on PPC64 && SMP
487 SMT scheduler support improves the CPU scheduler's decision making
488 when dealing with POWER5 cpus at a cost of slightly increased
489 overhead in some places. If unsure say N here.
491 config PROC_DEVICETREE
492 bool "Support for device tree in /proc"
495 This option adds a device-tree directory under /proc which contains
496 an image of the device tree that the kernel copies from Open
497 Firmware or other boot firmware. If unsure, say Y here.
500 bool "Default bootloader kernel arguments"
503 string "Initial kernel command string"
504 depends on CMDLINE_BOOL
505 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
507 On some platforms, there is currently no way for the boot loader to
508 pass arguments to the kernel. For these platforms, you can supply
509 some command-line options at build time by entering them here. In
510 most cases you will need to specify the root device here.
513 string "Additional default image types"
515 List additional targets to be built by the bootwrapper here (separated
516 by spaces). This is useful for targets that depend of device tree
517 files in the .dts directory.
519 Targets in this list will be build as part of the default build
520 target, or when the user does a 'make zImage' or a
521 'make zImage.initrd'.
523 If unsure, leave blank
526 config ARCH_WANTS_FREEZER_CONTROL
530 source kernel/power/Kconfig
534 bool "Enable seccomp to safely compute untrusted bytecode"
538 This kernel feature is useful for number crunching applications
539 that may need to compute untrusted bytecode during their
540 execution. By using pipes or other transports made available to
541 the process as file descriptors supporting the read/write
542 syscalls, it's possible to isolate those applications in
543 their own address space using seccomp. Once seccomp is
544 enabled via /proc/<pid>/seccomp, it cannot be disabled
545 and the task is only allowed to execute a few safe syscalls
546 defined by each seccomp mode.
548 If unsure, say Y. Only embedded should say N here.
554 default !PPC_ISERIES || PCI
559 bool "Support for ISA-bus hardware"
560 depends on PPC_PREP || PPC_CHRP
563 Find out whether you have ISA slots on your motherboard. ISA is the
564 name of a bus system, i.e. the way the CPU talks to the other stuff
565 inside your box. If you have an Apple machine, say N here; if you
566 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
567 you have an embedded board, consult your board documentation.
573 config GENERIC_ISA_DMA
575 depends on PPC64 || POWER4 || 6xx && !CPM2
578 config PPC_INDIRECT_PCI
581 default y if 40x || 44x
595 select PPC_INDIRECT_PCI
603 Freescale Localbus support
607 depends on PPC_83xx || QUICC_ENGINE || CPM2
609 Freescale General-purpose Timers support
611 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
615 # Platforms that what PCI turned unconditionally just do select PCI
616 # in their config node. Platforms that want to choose at config
617 # time should select PPC_PCI_CHOICE
618 config PPC_PCI_CHOICE
622 bool "PCI support" if PPC_PCI_CHOICE
623 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
624 && !PPC_85xx && !PPC_86xx
625 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
626 default PCI_QSPAN if !4xx && !CPM2 && 8xx
627 select ARCH_SUPPORTS_MSI
629 Find out whether your system includes a PCI bus. PCI is the name of
630 a bus system, i.e. the way the CPU talks to the other stuff inside
631 your box. If you say Y here, the kernel will include drivers and
632 infrastructure code to support PCI bus devices.
642 depends on !4xx && !CPM2 && 8xx
645 Say Y here if you have a system based on a Motorola 8xx-series
646 embedded processor with a QSPAN PCI interface, otherwise say N.
650 depends on PCI && 8260
651 select PPC_INDIRECT_PCI
655 bool "Enable workaround for MPC826x erratum PCI 9"
656 depends on PCI_8260 && !8272
660 prompt "IDMA channel for PCI 9 workaround"
663 config 8260_PCI9_IDMA1
666 config 8260_PCI9_IDMA2
669 config 8260_PCI9_IDMA3
672 config 8260_PCI9_IDMA4
677 source "drivers/pci/pcie/Kconfig"
679 source "drivers/pci/Kconfig"
681 source "drivers/pcmcia/Kconfig"
683 source "drivers/pci/hotplug/Kconfig"
690 bool "RapidIO support"
691 depends on HAS_RAPIDIO
693 If you say Y here, the kernel will include drivers and
694 infrastructure code to support RapidIO interconnect devices.
696 source "drivers/rapidio/Kconfig"
700 menu "Advanced setup"
703 config ADVANCED_OPTIONS
704 bool "Prompt for advanced kernel configuration options"
706 This option will enable prompting for a variety of advanced kernel
707 configuration options. These options can cause the kernel to not
708 work if they are set incorrectly, but can be used to optimize certain
709 aspects of kernel memory management.
711 Unless you know what you are doing, say N here.
713 comment "Default settings for advanced configuration options are used"
714 depends on !ADVANCED_OPTIONS
716 config LOWMEM_SIZE_BOOL
717 bool "Set maximum low memory"
718 depends on ADVANCED_OPTIONS
720 This option allows you to set the maximum amount of memory which
721 will be used as "low memory", that is, memory which the kernel can
722 access directly, without having to set up a kernel virtual mapping.
723 This can be useful in optimizing the layout of kernel virtual
726 Say N here unless you know what you are doing.
729 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
733 bool "Build a relocatable kernel (EXPERIMENTAL)"
734 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
736 This builds a kernel image that is capable of running at the
737 location the kernel is loaded at (some alignment restrictions may
740 One use is for the kexec on panic case where the recovery kernel
741 must live at a different physical address than the primary
744 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
745 it has been loaded at and the compile time physical addresses
746 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
747 setting can still be useful to bootwrappers that need to know the
748 load location of the kernel (eg. u-boot/mkimage).
750 config PAGE_OFFSET_BOOL
751 bool "Set custom page offset address"
752 depends on ADVANCED_OPTIONS
754 This option allows you to set the kernel virtual address at which
755 the kernel will map low memory. This can be useful in optimizing
756 the virtual memory layout of the system.
758 Say N here unless you know what you are doing.
761 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
764 config KERNEL_START_BOOL
765 bool "Set custom kernel base address"
766 depends on ADVANCED_OPTIONS
768 This option allows you to set the kernel virtual address at which
769 the kernel will be loaded. Normally this should match PAGE_OFFSET
770 however there are times (like kdump) that one might not want them
773 Say N here unless you know what you are doing.
776 hex "Virtual address of kernel base" if KERNEL_START_BOOL
777 default PAGE_OFFSET if PAGE_OFFSET_BOOL
778 default "0xc2000000" if CRASH_DUMP
781 config PHYSICAL_START_BOOL
782 bool "Set physical address where the kernel is loaded"
783 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
785 This gives the physical address where the kernel is loaded.
787 Say N here unless you know what you are doing.
789 config PHYSICAL_START
790 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
791 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
794 config PHYSICAL_ALIGN
796 default "0x10000000" if FSL_BOOKE
798 This value puts the alignment restrictions on physical address
799 where kernel is loaded and run from. Kernel is compiled for an
800 address which meets above alignment restriction.
802 config TASK_SIZE_BOOL
803 bool "Set custom user task size"
804 depends on ADVANCED_OPTIONS
806 This option allows you to set the amount of virtual address space
807 allocated to user tasks. This can be useful in optimizing the
808 virtual memory layout of the system.
810 Say N here unless you know what you are doing.
813 hex "Size of user task space" if TASK_SIZE_BOOL
814 default "0x80000000" if PPC_PREP || PPC_8xx
817 config CONSISTENT_START_BOOL
818 bool "Set custom consistent memory pool address"
819 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
821 This option allows you to set the base virtual address
822 of the consistent memory pool. This pool of virtual
823 memory is used to make consistent memory allocations.
825 config CONSISTENT_START
826 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
827 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
828 default "0xff100000" if NOT_COHERENT_CACHE
830 config CONSISTENT_SIZE_BOOL
831 bool "Set custom consistent memory pool size"
832 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
834 This option allows you to set the size of the
835 consistent memory pool. This pool of virtual memory
836 is used to make consistent memory allocations.
838 config CONSISTENT_SIZE
839 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
840 default "0x00200000" if NOT_COHERENT_CACHE
843 bool "Pinned Kernel TLBs (860 ONLY)"
844 depends on ADVANCED_OPTIONS && 8xx
849 bool "Build a relocatable kernel"
851 This builds a kernel image that is capable of running anywhere
852 in the RMA (real memory area) at any 16k-aligned base address.
853 The kernel is linked as a position-independent executable (PIE)
854 and contains dynamic relocations which are processed early
855 in the bootup process.
857 One use is for the kexec on panic case where the recovery kernel
858 must live at a different physical address than the primary
863 default "0xc000000000000000"
866 default "0xc000000000000000"
867 config PHYSICAL_START
874 source "drivers/Kconfig"
878 # XXX source "arch/ppc/8xx_io/Kconfig"
880 # XXX source "arch/ppc/8260_io/Kconfig"
882 source "arch/powerpc/sysdev/qe_lib/Kconfig"
886 source "arch/powerpc/Kconfig.debug"
888 source "security/Kconfig"
892 depends on COMPAT && KEYS
895 source "crypto/Kconfig"
905 source "arch/powerpc/kvm/Kconfig"