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_FUNCTION_TRACER
112 select ARCH_WANT_OPTIONAL_GPIOLIB
114 select HAVE_IOREMAP_PROT
115 select HAVE_EFFICIENT_UNALIGNED_ACCESS
117 select HAVE_ARCH_KGDB
118 select HAVE_KRETPROBES
119 select HAVE_ARCH_TRACEHOOK
121 select HAVE_DMA_ATTRS if PPC64
122 select USE_GENERIC_SMP_HELPERS if SMP
132 select COMPAT_BINFMT_ELF
134 config SYSVIPC_COMPAT
136 depends on COMPAT && SYSVIPC
139 # All PPC32s use generic nvram driver through ppc_md
144 config SCHED_OMIT_FRAME_POINTER
148 config ARCH_MAY_HAVE_PC_FDC
150 default !PPC_PSERIES || PCI
158 config PPC_UDBG_16550
162 config GENERIC_TBSYNC
164 default y if PPC32 && SMP
176 config SYS_SUPPORTS_APM_EMULATION
177 default y if PMAC_APM_EMU
180 config DEFAULT_UIMAGE
183 Used to allow a board to specify it wants a uImage built by default
191 depends on (PPC_PMAC && !SMP) || BROKEN
196 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
199 config ARCH_HIBERNATION_POSSIBLE
201 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
204 config ARCH_SUSPEND_POSSIBLE
206 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
208 config PPC_DCR_NATIVE
218 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
221 config PPC_OF_PLATFORM_PCI
224 depends on PPC64 # not supported on 32 bits yet
227 source "init/Kconfig"
229 source "kernel/Kconfig.freezer"
231 source "arch/powerpc/sysdev/Kconfig"
232 source "arch/powerpc/platforms/Kconfig"
234 menu "Kernel options"
237 bool "High memory support"
240 source kernel/time/Kconfig
241 source kernel/Kconfig.hz
242 source kernel/Kconfig.preempt
243 source "fs/Kconfig.binfmt"
245 config HUGETLB_PAGE_SIZE_VARIABLE
247 depends on HUGETLB_PAGE
250 config MATH_EMULATION
251 bool "Math emulation"
252 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
254 Some PowerPC chips designed for embedded applications do not have
255 a floating-point unit and therefore do not implement the
256 floating-point instructions in the PowerPC instruction set. If you
257 say Y here, the kernel will include code to emulate a floating-point
258 unit, which will allow programs that use floating-point
261 config 8XX_MINIMAL_FPEMU
262 bool "Minimal math emulation for 8xx"
263 depends on 8xx && !MATH_EMULATION
265 Older arch/ppc kernels still emulated a few floating point
266 instructions such as load and store, even when full math
267 emulation is disabled. Say "Y" here if you want to preserve
270 It is recommended that you build a soft-float userspace instead.
273 bool "Enable IOMMU virtual merging"
277 Cause IO segments sent to a device for DMA to be merged virtually
278 by the IOMMU when they happen to have been allocated contiguously.
279 This doesn't add pressure to the IOMMU allocator. However, some
280 drivers don't support getting large merged segments coming back
283 Most drivers don't have this problem; it is safe to say Y here.
289 bool "Support for enabling/disabling CPUs"
290 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
292 Say Y here to be able to disable and re-enable individual
293 CPUs at runtime on SMP machines.
295 Say N if you are unsure.
297 config ARCH_ENABLE_MEMORY_HOTPLUG
300 config ARCH_HAS_WALK_MEMORY
303 config ARCH_ENABLE_MEMORY_HOTREMOVE
307 bool "kexec system call (EXPERIMENTAL)"
308 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
310 kexec is a system call that implements the ability to shutdown your
311 current kernel, and to start another kernel. It is like a reboot
312 but it is independent of the system firmware. And like a reboot
313 you can start any kernel with it, not just Linux.
315 The name comes from the similarity to the exec system call.
317 It is an ongoing process to be certain the hardware in a machine
318 is properly shutdown, so do not be surprised if this code does not
319 initially work for you. It may help to enable device hotplugging
320 support. As of this writing the exact hardware interface is
321 strongly in flux, so no good recommendation can be made.
324 bool "Build a kdump crash kernel"
325 depends on PPC_MULTIPLATFORM && PPC64 && RELOCATABLE
327 Build a kernel suitable for use as a kdump capture kernel.
328 The same kernel binary can be used as production kernel and dump
332 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
333 depends on PPC_PSERIES && EXPERIMENTAL
335 Hypervisor-assisted dump is meant to be a kdump replacement
336 offering robustness and speed not possible without system
337 hypervisor assistence.
342 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
343 default y if PPC_PREP
346 bool "Distribute interrupts on all CPUs by default"
347 depends on SMP && !MV64360
349 This option gives the kernel permission to distribute IRQs across
350 multiple CPUs. Saying N here will route all IRQs to the first
351 CPU. Generally saying Y is safe, although some problems have been
352 reported with SMP Power Macintoshes with this option enabled.
357 default y if SMP && PPC_PSERIES
362 depends on NEED_MULTIPLE_NODES
364 config ARCH_SELECT_MEMORY_MODEL
368 config ARCH_FLATMEM_ENABLE
370 depends on (PPC64 && !NUMA) || PPC32
372 config ARCH_SPARSEMEM_ENABLE
375 select SPARSEMEM_VMEMMAP_ENABLE
377 config ARCH_SPARSEMEM_DEFAULT
379 depends on (SMP && PPC_PSERIES) || PPC_PS3
381 config ARCH_POPULATES_NODE_MAP
386 config ARCH_MEMORY_PROBE
388 depends on MEMORY_HOTPLUG
390 # Some NUMA nodes have memory ranges that span
391 # other nodes. Even though a pfn is valid and
392 # between a node's start and end pfns, it may not
393 # reside on that node. See memmap_init_zone()
395 config NODES_SPAN_OTHER_NODES
397 depends on NEED_MULTIPLE_NODES
399 config PPC_HAS_HASH_64K
407 select PPC_HAS_HASH_64K
409 This option changes the kernel logical page size to 64k. On machines
410 without processor support for 64k pages, the kernel will simulate
411 them by loading each individual 4k page on demand transparently,
412 while on hardware with such support, it will be used to map
413 normal application pages.
415 config FORCE_MAX_ZONEORDER
416 int "Maximum zone order"
417 range 9 64 if PPC_64K_PAGES
418 default "9" if PPC_64K_PAGES
419 range 13 64 if PPC64 && !PPC_64K_PAGES
420 default "13" if PPC64 && !PPC_64K_PAGES
424 The kernel memory allocator divides physically contiguous memory
425 blocks into "zones", where each zone is a power of two number of
426 pages. This option selects the largest power of two that the kernel
427 keeps in the memory allocator. If you need to allocate very large
428 blocks of physically contiguous memory, then you may need to
431 This config option is actually maximum order plus one. For example,
432 a value of 11 means that the largest free memory block is 2^10 pages.
434 The page size is not necessarily 4KB. For example, on 64-bit
435 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
436 this in mind when choosing a value for this option.
438 config PPC_SUBPAGE_PROT
439 bool "Support setting protections for 4k subpages"
440 depends on PPC_64K_PAGES
442 This option adds support for a system call to allow user programs
443 to set access permissions (read/write, readonly, or no access)
444 on the 4k subpages of each 64k page.
447 bool "SMT (Hyperthreading) scheduler support"
448 depends on PPC64 && SMP
450 SMT scheduler support improves the CPU scheduler's decision making
451 when dealing with POWER5 cpus at a cost of slightly increased
452 overhead in some places. If unsure say N here.
454 config PROC_DEVICETREE
455 bool "Support for device tree in /proc"
458 This option adds a device-tree directory under /proc which contains
459 an image of the device tree that the kernel copies from Open
460 Firmware or other boot firmware. If unsure, say Y here.
463 bool "Default bootloader kernel arguments"
466 string "Initial kernel command string"
467 depends on CMDLINE_BOOL
468 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
470 On some platforms, there is currently no way for the boot loader to
471 pass arguments to the kernel. For these platforms, you can supply
472 some command-line options at build time by entering them here. In
473 most cases you will need to specify the root device here.
476 string "Additional default image types"
478 List additional targets to be built by the bootwrapper here (separated
479 by spaces). This is useful for targets that depend of device tree
480 files in the .dts directory.
482 Targets in this list will be build as part of the default build
483 target, or when the user does a 'make zImage' or a
484 'make zImage.initrd'.
486 If unsure, leave blank
489 config ARCH_WANTS_FREEZER_CONTROL
493 source kernel/power/Kconfig
497 bool "Enable seccomp to safely compute untrusted bytecode"
501 This kernel feature is useful for number crunching applications
502 that may need to compute untrusted bytecode during their
503 execution. By using pipes or other transports made available to
504 the process as file descriptors supporting the read/write
505 syscalls, it's possible to isolate those applications in
506 their own address space using seccomp. Once seccomp is
507 enabled via /proc/<pid>/seccomp, it cannot be disabled
508 and the task is only allowed to execute a few safe syscalls
509 defined by each seccomp mode.
511 If unsure, say Y. Only embedded should say N here.
517 default !PPC_ISERIES || PCI
522 bool "Support for ISA-bus hardware"
523 depends on PPC_PREP || PPC_CHRP
526 Find out whether you have ISA slots on your motherboard. ISA is the
527 name of a bus system, i.e. the way the CPU talks to the other stuff
528 inside your box. If you have an Apple machine, say N here; if you
529 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
530 you have an embedded board, consult your board documentation.
536 config GENERIC_ISA_DMA
538 depends on PPC64 || POWER4 || 6xx && !CPM2
541 config PPC_INDIRECT_PCI
544 default y if 40x || 44x
558 select PPC_INDIRECT_PCI
566 Freescale Localbus support
570 depends on PPC_83xx || QUICC_ENGINE || CPM2
572 Freescale General-purpose Timers support
574 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
578 # Platforms that what PCI turned unconditionally just do select PCI
579 # in their config node. Platforms that want to choose at config
580 # time should select PPC_PCI_CHOICE
581 config PPC_PCI_CHOICE
585 bool "PCI support" if PPC_PCI_CHOICE
586 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
587 && !PPC_85xx && !PPC_86xx
588 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
589 default PCI_QSPAN if !4xx && !CPM2 && 8xx
590 select ARCH_SUPPORTS_MSI
592 Find out whether your system includes a PCI bus. PCI is the name of
593 a bus system, i.e. the way the CPU talks to the other stuff inside
594 your box. If you say Y here, the kernel will include drivers and
595 infrastructure code to support PCI bus devices.
605 depends on !4xx && !CPM2 && 8xx
608 Say Y here if you have a system based on a Motorola 8xx-series
609 embedded processor with a QSPAN PCI interface, otherwise say N.
613 depends on PCI && 8260
614 select PPC_INDIRECT_PCI
618 bool "Enable workaround for MPC826x erratum PCI 9"
619 depends on PCI_8260 && !8272
623 prompt "IDMA channel for PCI 9 workaround"
626 config 8260_PCI9_IDMA1
629 config 8260_PCI9_IDMA2
632 config 8260_PCI9_IDMA3
635 config 8260_PCI9_IDMA4
640 source "drivers/pci/pcie/Kconfig"
642 source "drivers/pci/Kconfig"
644 source "drivers/pcmcia/Kconfig"
646 source "drivers/pci/hotplug/Kconfig"
653 bool "RapidIO support"
654 depends on HAS_RAPIDIO
656 If you say Y here, the kernel will include drivers and
657 infrastructure code to support RapidIO interconnect devices.
659 source "drivers/rapidio/Kconfig"
663 menu "Advanced setup"
666 config ADVANCED_OPTIONS
667 bool "Prompt for advanced kernel configuration options"
669 This option will enable prompting for a variety of advanced kernel
670 configuration options. These options can cause the kernel to not
671 work if they are set incorrectly, but can be used to optimize certain
672 aspects of kernel memory management.
674 Unless you know what you are doing, say N here.
676 comment "Default settings for advanced configuration options are used"
677 depends on !ADVANCED_OPTIONS
679 config LOWMEM_SIZE_BOOL
680 bool "Set maximum low memory"
681 depends on ADVANCED_OPTIONS
683 This option allows you to set the maximum amount of memory which
684 will be used as "low memory", that is, memory which the kernel can
685 access directly, without having to set up a kernel virtual mapping.
686 This can be useful in optimizing the layout of kernel virtual
689 Say N here unless you know what you are doing.
692 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
696 bool "Build a relocatable kernel (EXPERIMENTAL)"
697 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
699 This builds a kernel image that is capable of running at the
700 location the kernel is loaded at (some alignment restrictions may
703 One use is for the kexec on panic case where the recovery kernel
704 must live at a different physical address than the primary
707 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
708 it has been loaded at and the compile time physical addresses
709 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
710 setting can still be useful to bootwrappers that need to know the
711 load location of the kernel (eg. u-boot/mkimage).
713 config PAGE_OFFSET_BOOL
714 bool "Set custom page offset address"
715 depends on ADVANCED_OPTIONS
717 This option allows you to set the kernel virtual address at which
718 the kernel will map low memory. This can be useful in optimizing
719 the virtual memory layout of the system.
721 Say N here unless you know what you are doing.
724 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
727 config KERNEL_START_BOOL
728 bool "Set custom kernel base address"
729 depends on ADVANCED_OPTIONS
731 This option allows you to set the kernel virtual address at which
732 the kernel will be loaded. Normally this should match PAGE_OFFSET
733 however there are times (like kdump) that one might not want them
736 Say N here unless you know what you are doing.
739 hex "Virtual address of kernel base" if KERNEL_START_BOOL
740 default PAGE_OFFSET if PAGE_OFFSET_BOOL
741 default "0xc2000000" if CRASH_DUMP
744 config PHYSICAL_START_BOOL
745 bool "Set physical address where the kernel is loaded"
746 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
748 This gives the physical address where the kernel is loaded.
750 Say N here unless you know what you are doing.
752 config PHYSICAL_START
753 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
754 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
757 config PHYSICAL_ALIGN
759 default "0x10000000" if FSL_BOOKE
761 This value puts the alignment restrictions on physical address
762 where kernel is loaded and run from. Kernel is compiled for an
763 address which meets above alignment restriction.
765 config TASK_SIZE_BOOL
766 bool "Set custom user task size"
767 depends on ADVANCED_OPTIONS
769 This option allows you to set the amount of virtual address space
770 allocated to user tasks. This can be useful in optimizing the
771 virtual memory layout of the system.
773 Say N here unless you know what you are doing.
776 hex "Size of user task space" if TASK_SIZE_BOOL
777 default "0x80000000" if PPC_PREP || PPC_8xx
780 config CONSISTENT_START_BOOL
781 bool "Set custom consistent memory pool address"
782 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
784 This option allows you to set the base virtual address
785 of the consistent memory pool. This pool of virtual
786 memory is used to make consistent memory allocations.
788 config CONSISTENT_START
789 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
790 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
791 default "0xff100000" if NOT_COHERENT_CACHE
793 config CONSISTENT_SIZE_BOOL
794 bool "Set custom consistent memory pool size"
795 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
797 This option allows you to set the size of the
798 consistent memory pool. This pool of virtual memory
799 is used to make consistent memory allocations.
801 config CONSISTENT_SIZE
802 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
803 default "0x00200000" if NOT_COHERENT_CACHE
806 bool "Pinned Kernel TLBs (860 ONLY)"
807 depends on ADVANCED_OPTIONS && 8xx
812 bool "Build a relocatable kernel"
814 This builds a kernel image that is capable of running anywhere
815 in the RMA (real memory area) at any 16k-aligned base address.
816 The kernel is linked as a position-independent executable (PIE)
817 and contains dynamic relocations which are processed early
818 in the bootup process.
820 One use is for the kexec on panic case where the recovery kernel
821 must live at a different physical address than the primary
826 default "0xc000000000000000"
829 default "0xc000000000000000"
830 config PHYSICAL_START
837 source "drivers/Kconfig"
841 # XXX source "arch/ppc/8xx_io/Kconfig"
843 # XXX source "arch/ppc/8260_io/Kconfig"
845 source "arch/powerpc/sysdev/qe_lib/Kconfig"
849 source "arch/powerpc/Kconfig.debug"
851 source "security/Kconfig"
855 depends on COMPAT && KEYS
858 source "crypto/Kconfig"
868 source "arch/powerpc/kvm/Kconfig"