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"
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_DYNAMIC_FTRACE
114 select HAVE_IOREMAP_PROT
115 select HAVE_EFFICIENT_UNALIGNED_ACCESS
117 select HAVE_ARCH_KGDB
118 select HAVE_KRETPROBES
120 select HAVE_DMA_ATTRS if PPC64
121 select USE_GENERIC_SMP_HELPERS if SMP
131 select COMPAT_BINFMT_ELF
133 config SYSVIPC_COMPAT
135 depends on COMPAT && SYSVIPC
138 # All PPC32s use generic nvram driver through ppc_md
143 config SCHED_NO_NO_OMIT_FRAME_POINTER
147 config ARCH_MAY_HAVE_PC_FDC
149 default !PPC_PSERIES || PCI
157 config PPC_UDBG_16550
161 config GENERIC_TBSYNC
163 default y if PPC32 && SMP
175 config SYS_SUPPORTS_APM_EMULATION
176 default y if PMAC_APM_EMU
179 config DEFAULT_UIMAGE
182 Used to allow a board to specify it wants a uImage built by default
190 depends on (PPC_PMAC && !SMP) || BROKEN
195 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
198 config ARCH_HIBERNATION_POSSIBLE
200 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
203 config ARCH_SUSPEND_POSSIBLE
205 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
207 config PPC_DCR_NATIVE
217 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
220 config PPC_OF_PLATFORM_PCI
223 depends on PPC64 # not supported on 32 bits yet
226 source "init/Kconfig"
228 source "arch/powerpc/sysdev/Kconfig"
229 source "arch/powerpc/platforms/Kconfig"
231 menu "Kernel options"
234 bool "High memory support"
237 source kernel/time/Kconfig
238 source kernel/Kconfig.hz
239 source kernel/Kconfig.preempt
240 source "fs/Kconfig.binfmt"
242 config HUGETLB_PAGE_SIZE_VARIABLE
244 depends on HUGETLB_PAGE
247 config MATH_EMULATION
248 bool "Math emulation"
249 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
251 Some PowerPC chips designed for embedded applications do not have
252 a floating-point unit and therefore do not implement the
253 floating-point instructions in the PowerPC instruction set. If you
254 say Y here, the kernel will include code to emulate a floating-point
255 unit, which will allow programs that use floating-point
258 config 8XX_MINIMAL_FPEMU
259 bool "Minimal math emulation for 8xx"
260 depends on 8xx && !MATH_EMULATION
262 Older arch/ppc kernels still emulated a few floating point
263 instructions such as load and store, even when full math
264 emulation is disabled. Say "Y" here if you want to preserve
267 It is recommended that you build a soft-float userspace instead.
270 bool "Enable IOMMU virtual merging"
274 Cause IO segments sent to a device for DMA to be merged virtually
275 by the IOMMU when they happen to have been allocated contiguously.
276 This doesn't add pressure to the IOMMU allocator. However, some
277 drivers don't support getting large merged segments coming back
280 Most drivers don't have this problem; it is safe to say Y here.
286 bool "Support for enabling/disabling CPUs"
287 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
289 Say Y here to be able to disable and re-enable individual
290 CPUs at runtime on SMP machines.
292 Say N if you are unsure.
294 config ARCH_ENABLE_MEMORY_HOTPLUG
297 config ARCH_HAS_WALK_MEMORY
300 config ARCH_ENABLE_MEMORY_HOTREMOVE
304 bool "kexec system call (EXPERIMENTAL)"
305 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
307 kexec is a system call that implements the ability to shutdown your
308 current kernel, and to start another kernel. It is like a reboot
309 but it is independent of the system firmware. And like a reboot
310 you can start any kernel with it, not just Linux.
312 The name comes from the similarity to the exec system call.
314 It is an ongoing process to be certain the hardware in a machine
315 is properly shutdown, so do not be surprised if this code does not
316 initially work for you. It may help to enable device hotplugging
317 support. As of this writing the exact hardware interface is
318 strongly in flux, so no good recommendation can be made.
321 bool "Build a kdump crash kernel"
322 depends on PPC_MULTIPLATFORM && PPC64
324 Build a kernel suitable for use as a kdump capture kernel.
325 The kernel will be linked at a different address than normal, and
326 so can only be used for Kdump.
328 Don't change this unless you know what you are doing.
331 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
332 depends on PPC_PSERIES && EXPERIMENTAL
334 Hypervisor-assisted dump is meant to be a kdump replacement
335 offering robustness and speed not possible without system
336 hypervisor assistence.
341 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
342 default y if PPC_PREP
345 bool "Distribute interrupts on all CPUs by default"
346 depends on SMP && !MV64360
348 This option gives the kernel permission to distribute IRQs across
349 multiple CPUs. Saying N here will route all IRQs to the first
350 CPU. Generally saying Y is safe, although some problems have been
351 reported with SMP Power Macintoshes with this option enabled.
356 default y if SMP && PPC_PSERIES
361 depends on NEED_MULTIPLE_NODES
363 config ARCH_SELECT_MEMORY_MODEL
367 config ARCH_FLATMEM_ENABLE
369 depends on (PPC64 && !NUMA) || PPC32
371 config ARCH_SPARSEMEM_ENABLE
374 select SPARSEMEM_VMEMMAP_ENABLE
376 config ARCH_SPARSEMEM_DEFAULT
378 depends on (SMP && PPC_PSERIES) || PPC_PS3
380 config ARCH_POPULATES_NODE_MAP
385 config ARCH_MEMORY_PROBE
387 depends on MEMORY_HOTPLUG
389 # Some NUMA nodes have memory ranges that span
390 # other nodes. Even though a pfn is valid and
391 # between a node's start and end pfns, it may not
392 # reside on that node. See memmap_init_zone()
394 config NODES_SPAN_OTHER_NODES
396 depends on NEED_MULTIPLE_NODES
398 config PPC_HAS_HASH_64K
406 select PPC_HAS_HASH_64K
408 This option changes the kernel logical page size to 64k. On machines
409 without processor support for 64k pages, the kernel will simulate
410 them by loading each individual 4k page on demand transparently,
411 while on hardware with such support, it will be used to map
412 normal application pages.
414 config FORCE_MAX_ZONEORDER
415 int "Maximum zone order"
416 default "9" if PPC_64K_PAGES
417 default "13" if PPC64 && !PPC_64K_PAGES
420 The kernel memory allocator divides physically contiguous memory
421 blocks into "zones", where each zone is a power of two number of
422 pages. This option selects the largest power of two that the kernel
423 keeps in the memory allocator. If you need to allocate very large
424 blocks of physically contiguous memory, then you may need to
427 This config option is actually maximum order plus one. For example,
428 a value of 11 means that the largest free memory block is 2^10 pages.
430 The page size is not necessarily 4KB. For example, on 64-bit
431 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
432 this in mind when choosing a value for this option.
434 config PPC_SUBPAGE_PROT
435 bool "Support setting protections for 4k subpages"
436 depends on PPC_64K_PAGES
438 This option adds support for a system call to allow user programs
439 to set access permissions (read/write, readonly, or no access)
440 on the 4k subpages of each 64k page.
443 bool "SMT (Hyperthreading) scheduler support"
444 depends on PPC64 && SMP
446 SMT scheduler support improves the CPU scheduler's decision making
447 when dealing with POWER5 cpus at a cost of slightly increased
448 overhead in some places. If unsure say N here.
450 config PROC_DEVICETREE
451 bool "Support for device tree in /proc"
454 This option adds a device-tree directory under /proc which contains
455 an image of the device tree that the kernel copies from Open
456 Firmware or other boot firmware. If unsure, say Y here.
459 bool "Default bootloader kernel arguments"
462 string "Initial kernel command string"
463 depends on CMDLINE_BOOL
464 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
466 On some platforms, there is currently no way for the boot loader to
467 pass arguments to the kernel. For these platforms, you can supply
468 some command-line options at build time by entering them here. In
469 most cases you will need to specify the root device here.
472 string "Additional default image types"
474 List additional targets to be built by the bootwrapper here (separated
475 by spaces). This is useful for targets that depend of device tree
476 files in the .dts directory.
478 Targets in this list will be build as part of the default build
479 target, or when the user does a 'make zImage' or a
480 'make zImage.initrd'.
482 If unsure, leave blank
485 config ARCH_WANTS_FREEZER_CONTROL
489 source kernel/power/Kconfig
493 bool "Enable seccomp to safely compute untrusted bytecode"
497 This kernel feature is useful for number crunching applications
498 that may need to compute untrusted bytecode during their
499 execution. By using pipes or other transports made available to
500 the process as file descriptors supporting the read/write
501 syscalls, it's possible to isolate those applications in
502 their own address space using seccomp. Once seccomp is
503 enabled via /proc/<pid>/seccomp, it cannot be disabled
504 and the task is only allowed to execute a few safe syscalls
505 defined by each seccomp mode.
507 If unsure, say Y. Only embedded should say N here.
513 default !PPC_ISERIES || PCI
518 bool "Support for ISA-bus hardware"
519 depends on PPC_PREP || PPC_CHRP
522 Find out whether you have ISA slots on your motherboard. ISA is the
523 name of a bus system, i.e. the way the CPU talks to the other stuff
524 inside your box. If you have an Apple machine, say N here; if you
525 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
526 you have an embedded board, consult your board documentation.
532 config GENERIC_ISA_DMA
534 depends on PPC64 || POWER4 || 6xx && !CPM2
537 config PPC_INDIRECT_PCI
540 default y if 40x || 44x
554 select PPC_INDIRECT_PCI
562 Freescale Localbus support
566 depends on PPC_83xx || QUICC_ENGINE || CPM2
568 Freescale General-purpose Timers support
570 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
574 # Platforms that what PCI turned unconditionally just do select PCI
575 # in their config node. Platforms that want to choose at config
576 # time should select PPC_PCI_CHOICE
577 config PPC_PCI_CHOICE
581 bool "PCI support" if PPC_PCI_CHOICE
582 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
583 && !PPC_85xx && !PPC_86xx
584 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
585 default PCI_QSPAN if !4xx && !CPM2 && 8xx
586 select ARCH_SUPPORTS_MSI
588 Find out whether your system includes a PCI bus. PCI is the name of
589 a bus system, i.e. the way the CPU talks to the other stuff inside
590 your box. If you say Y here, the kernel will include drivers and
591 infrastructure code to support PCI bus devices.
601 depends on !4xx && !CPM2 && 8xx
604 Say Y here if you have a system based on a Motorola 8xx-series
605 embedded processor with a QSPAN PCI interface, otherwise say N.
609 depends on PCI && 8260
610 select PPC_INDIRECT_PCI
614 bool "Enable workaround for MPC826x erratum PCI 9"
615 depends on PCI_8260 && !8272
619 prompt "IDMA channel for PCI 9 workaround"
622 config 8260_PCI9_IDMA1
625 config 8260_PCI9_IDMA2
628 config 8260_PCI9_IDMA3
631 config 8260_PCI9_IDMA4
636 source "drivers/pci/pcie/Kconfig"
638 source "drivers/pci/Kconfig"
640 source "drivers/pcmcia/Kconfig"
642 source "drivers/pci/hotplug/Kconfig"
649 bool "RapidIO support"
650 depends on HAS_RAPIDIO
652 If you say Y here, the kernel will include drivers and
653 infrastructure code to support RapidIO interconnect devices.
655 source "drivers/rapidio/Kconfig"
659 menu "Advanced setup"
662 config ADVANCED_OPTIONS
663 bool "Prompt for advanced kernel configuration options"
665 This option will enable prompting for a variety of advanced kernel
666 configuration options. These options can cause the kernel to not
667 work if they are set incorrectly, but can be used to optimize certain
668 aspects of kernel memory management.
670 Unless you know what you are doing, say N here.
672 comment "Default settings for advanced configuration options are used"
673 depends on !ADVANCED_OPTIONS
675 config LOWMEM_SIZE_BOOL
676 bool "Set maximum low memory"
677 depends on ADVANCED_OPTIONS
679 This option allows you to set the maximum amount of memory which
680 will be used as "low memory", that is, memory which the kernel can
681 access directly, without having to set up a kernel virtual mapping.
682 This can be useful in optimizing the layout of kernel virtual
685 Say N here unless you know what you are doing.
688 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
692 bool "Build a relocatable kernel (EXPERIMENTAL)"
693 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
695 This builds a kernel image that is capable of running at the
696 location the kernel is loaded at (some alignment restrictions may
699 One use is for the kexec on panic case where the recovery kernel
700 must live at a different physical address than the primary
703 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
704 it has been loaded at and the compile time physical addresses
705 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
706 setting can still be useful to bootwrappers that need to know the
707 load location of the kernel (eg. u-boot/mkimage).
709 config PAGE_OFFSET_BOOL
710 bool "Set custom page offset address"
711 depends on ADVANCED_OPTIONS
713 This option allows you to set the kernel virtual address at which
714 the kernel will map low memory. This can be useful in optimizing
715 the virtual memory layout of the system.
717 Say N here unless you know what you are doing.
720 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
723 config KERNEL_START_BOOL
724 bool "Set custom kernel base address"
725 depends on ADVANCED_OPTIONS
727 This option allows you to set the kernel virtual address at which
728 the kernel will be loaded. Normally this should match PAGE_OFFSET
729 however there are times (like kdump) that one might not want them
732 Say N here unless you know what you are doing.
735 hex "Virtual address of kernel base" if KERNEL_START_BOOL
736 default PAGE_OFFSET if PAGE_OFFSET_BOOL
737 default "0xc2000000" if CRASH_DUMP
740 config PHYSICAL_START_BOOL
741 bool "Set physical address where the kernel is loaded"
742 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
744 This gives the physical address where the kernel is loaded.
746 Say N here unless you know what you are doing.
748 config PHYSICAL_START
749 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
750 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
753 config PHYSICAL_ALIGN
755 default "0x10000000" if FSL_BOOKE
757 This value puts the alignment restrictions on physical address
758 where kernel is loaded and run from. Kernel is compiled for an
759 address which meets above alignment restriction.
761 config TASK_SIZE_BOOL
762 bool "Set custom user task size"
763 depends on ADVANCED_OPTIONS
765 This option allows you to set the amount of virtual address space
766 allocated to user tasks. This can be useful in optimizing the
767 virtual memory layout of the system.
769 Say N here unless you know what you are doing.
772 hex "Size of user task space" if TASK_SIZE_BOOL
773 default "0x80000000" if PPC_PREP || PPC_8xx
776 config CONSISTENT_START_BOOL
777 bool "Set custom consistent memory pool address"
778 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
780 This option allows you to set the base virtual address
781 of the consistent memory pool. This pool of virtual
782 memory is used to make consistent memory allocations.
784 config CONSISTENT_START
785 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
786 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
787 default "0xff100000" if NOT_COHERENT_CACHE
789 config CONSISTENT_SIZE_BOOL
790 bool "Set custom consistent memory pool size"
791 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
793 This option allows you to set the size of the
794 consistent memory pool. This pool of virtual memory
795 is used to make consistent memory allocations.
797 config CONSISTENT_SIZE
798 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
799 default "0x00200000" if NOT_COHERENT_CACHE
802 bool "Pinned Kernel TLBs (860 ONLY)"
803 depends on ADVANCED_OPTIONS && 8xx
809 default "0xc000000000000000"
812 default "0xc000000002000000" if CRASH_DUMP
813 default "0xc000000000000000"
814 config PHYSICAL_START
816 default "0x02000000" if CRASH_DUMP
822 source "drivers/Kconfig"
826 # XXX source "arch/ppc/8xx_io/Kconfig"
828 # XXX source "arch/ppc/8260_io/Kconfig"
830 source "arch/powerpc/sysdev/qe_lib/Kconfig"
834 source "arch/powerpc/Kconfig.debug"
836 source "security/Kconfig"
840 depends on COMPAT && KEYS
843 source "crypto/Kconfig"
853 source "arch/powerpc/kvm/Kconfig"