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 TRACE_IRQFLAGS_SUPPORT
61 config LOCKDEP_SUPPORT
65 config RWSEM_GENERIC_SPINLOCK
68 config RWSEM_XCHGADD_ALGORITHM
72 config GENERIC_LOCKBREAK
75 depends on SMP && PREEMPT
77 config ARCH_HAS_ILOG2_U32
81 config ARCH_HAS_ILOG2_U64
85 config GENERIC_HWEIGHT
89 config GENERIC_CALIBRATE_DELAY
93 config GENERIC_FIND_NEXT_BIT
100 Generic GPIO API support
102 config ARCH_NO_VIRT_TO_BUS
111 select HAVE_KRETPROBES
113 select HAVE_DMA_ATTRS
122 select COMPAT_BINFMT_ELF
124 config SYSVIPC_COMPAT
126 depends on COMPAT && SYSVIPC
129 # All PPC32s use generic nvram driver through ppc_md
134 config SCHED_NO_NO_OMIT_FRAME_POINTER
138 config ARCH_MAY_HAVE_PC_FDC
140 default !PPC_PSERIES || PCI
148 config PPC_UDBG_16550
152 config GENERIC_TBSYNC
154 default y if PPC32 && SMP
166 config SYS_SUPPORTS_APM_EMULATION
167 default y if PMAC_APM_EMU
170 config DEFAULT_UIMAGE
173 Used to allow a board to specify it wants a uImage built by default
181 depends on (PPC_PMAC && !SMP) || BROKEN
186 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
189 config ARCH_HIBERNATION_POSSIBLE
191 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
194 config ARCH_SUSPEND_POSSIBLE
196 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
198 config PPC_DCR_NATIVE
208 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
211 config PPC_OF_PLATFORM_PCI
214 depends on PPC64 # not supported on 32 bits yet
217 source "init/Kconfig"
219 source "arch/powerpc/sysdev/Kconfig"
220 source "arch/powerpc/platforms/Kconfig"
222 menu "Kernel options"
225 bool "High memory support"
228 source kernel/time/Kconfig
229 source kernel/Kconfig.hz
230 source kernel/Kconfig.preempt
231 source "fs/Kconfig.binfmt"
233 config HUGETLB_PAGE_SIZE_VARIABLE
235 depends on HUGETLB_PAGE
238 config MATH_EMULATION
239 bool "Math emulation"
240 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
242 Some PowerPC chips designed for embedded applications do not have
243 a floating-point unit and therefore do not implement the
244 floating-point instructions in the PowerPC instruction set. If you
245 say Y here, the kernel will include code to emulate a floating-point
246 unit, which will allow programs that use floating-point
249 config 8XX_MINIMAL_FPEMU
250 bool "Minimal math emulation for 8xx"
251 depends on 8xx && !MATH_EMULATION
253 Older arch/ppc kernels still emulated a few floating point
254 instructions such as load and store, even when full math
255 emulation is disabled. Say "Y" here if you want to preserve
258 It is recommended that you build a soft-float userspace instead.
261 bool "Enable IOMMU virtual merging"
265 Cause IO segments sent to a device for DMA to be merged virtually
266 by the IOMMU when they happen to have been allocated contiguously.
267 This doesn't add pressure to the IOMMU allocator. However, some
268 drivers don't support getting large merged segments coming back
271 Most drivers don't have this problem; it is safe to say Y here.
277 bool "Support for enabling/disabling CPUs"
278 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
280 Say Y here to be able to disable and re-enable individual
281 CPUs at runtime on SMP machines.
283 Say N if you are unsure.
285 config ARCH_ENABLE_MEMORY_HOTPLUG
288 config ARCH_HAS_WALK_MEMORY
291 config ARCH_ENABLE_MEMORY_HOTREMOVE
295 bool "kexec system call (EXPERIMENTAL)"
296 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
298 kexec is a system call that implements the ability to shutdown your
299 current kernel, and to start another kernel. It is like a reboot
300 but it is independent of the system firmware. And like a reboot
301 you can start any kernel with it, not just Linux.
303 The name comes from the similarity to the exec system call.
305 It is an ongoing process to be certain the hardware in a machine
306 is properly shutdown, so do not be surprised if this code does not
307 initially work for you. It may help to enable device hotplugging
308 support. As of this writing the exact hardware interface is
309 strongly in flux, so no good recommendation can be made.
312 bool "Build a kdump crash kernel"
313 depends on PPC_MULTIPLATFORM && PPC64
315 Build a kernel suitable for use as a kdump capture kernel.
316 The kernel will be linked at a different address than normal, and
317 so can only be used for Kdump.
319 Don't change this unless you know what you are doing.
322 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
323 depends on PPC_PSERIES && EXPERIMENTAL
325 Hypervisor-assisted dump is meant to be a kdump replacement
326 offering robustness and speed not possible without system
327 hypervisor assistence.
332 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
333 default y if PPC_PREP
336 bool "Distribute interrupts on all CPUs by default"
337 depends on SMP && !MV64360
339 This option gives the kernel permission to distribute IRQs across
340 multiple CPUs. Saying N here will route all IRQs to the first
341 CPU. Generally saying Y is safe, although some problems have been
342 reported with SMP Power Macintoshes with this option enabled.
347 default y if SMP && PPC_PSERIES
352 depends on NEED_MULTIPLE_NODES
354 config ARCH_SELECT_MEMORY_MODEL
358 config ARCH_FLATMEM_ENABLE
360 depends on (PPC64 && !NUMA) || PPC32
362 config ARCH_SPARSEMEM_ENABLE
365 select SPARSEMEM_VMEMMAP_ENABLE
367 config ARCH_SPARSEMEM_DEFAULT
369 depends on (SMP && PPC_PSERIES) || PPC_PS3
371 config ARCH_POPULATES_NODE_MAP
376 config ARCH_MEMORY_PROBE
378 depends on MEMORY_HOTPLUG
380 # Some NUMA nodes have memory ranges that span
381 # other nodes. Even though a pfn is valid and
382 # between a node's start and end pfns, it may not
383 # reside on that node. See memmap_init_zone()
385 config NODES_SPAN_OTHER_NODES
387 depends on NEED_MULTIPLE_NODES
389 config PPC_HAS_HASH_64K
397 select PPC_HAS_HASH_64K
399 This option changes the kernel logical page size to 64k. On machines
400 without processor support for 64k pages, the kernel will simulate
401 them by loading each individual 4k page on demand transparently,
402 while on hardware with such support, it will be used to map
403 normal application pages.
405 config FORCE_MAX_ZONEORDER
406 int "Maximum zone order"
407 default "9" if PPC_64K_PAGES
408 default "13" if PPC64 && !PPC_64K_PAGES
411 The kernel memory allocator divides physically contiguous memory
412 blocks into "zones", where each zone is a power of two number of
413 pages. This option selects the largest power of two that the kernel
414 keeps in the memory allocator. If you need to allocate very large
415 blocks of physically contiguous memory, then you may need to
418 This config option is actually maximum order plus one. For example,
419 a value of 11 means that the largest free memory block is 2^10 pages.
421 The page size is not necessarily 4KB. For example, on 64-bit
422 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
423 this in mind when choosing a value for this option.
425 config PPC_SUBPAGE_PROT
426 bool "Support setting protections for 4k subpages"
427 depends on PPC_64K_PAGES
429 This option adds support for a system call to allow user programs
430 to set access permissions (read/write, readonly, or no access)
431 on the 4k subpages of each 64k page.
434 bool "SMT (Hyperthreading) scheduler support"
435 depends on PPC64 && SMP
437 SMT scheduler support improves the CPU scheduler's decision making
438 when dealing with POWER5 cpus at a cost of slightly increased
439 overhead in some places. If unsure say N here.
441 config PROC_DEVICETREE
442 bool "Support for device tree in /proc"
445 This option adds a device-tree directory under /proc which contains
446 an image of the device tree that the kernel copies from Open
447 Firmware or other boot firmware. If unsure, say Y here.
450 bool "Default bootloader kernel arguments"
453 string "Initial kernel command string"
454 depends on CMDLINE_BOOL
455 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
457 On some platforms, there is currently no way for the boot loader to
458 pass arguments to the kernel. For these platforms, you can supply
459 some command-line options at build time by entering them here. In
460 most cases you will need to specify the root device here.
463 string "Additional default image types"
465 List additional targets to be built by the bootwrapper here (separated
466 by spaces). This is useful for targets that depend of device tree
467 files in the .dts directory.
469 Targets in this list will be build as part of the default build
470 target, or when the user does a 'make zImage' or a
471 'make zImage.initrd'.
473 If unsure, leave blank
476 config ARCH_WANTS_FREEZER_CONTROL
480 source kernel/power/Kconfig
484 bool "Enable seccomp to safely compute untrusted bytecode"
488 This kernel feature is useful for number crunching applications
489 that may need to compute untrusted bytecode during their
490 execution. By using pipes or other transports made available to
491 the process as file descriptors supporting the read/write
492 syscalls, it's possible to isolate those applications in
493 their own address space using seccomp. Once seccomp is
494 enabled via /proc/<pid>/seccomp, it cannot be disabled
495 and the task is only allowed to execute a few safe syscalls
496 defined by each seccomp mode.
498 If unsure, say Y. Only embedded should say N here.
504 default !PPC_ISERIES || PCI
509 bool "Support for ISA-bus hardware"
510 depends on PPC_PREP || PPC_CHRP
513 Find out whether you have ISA slots on your motherboard. ISA is the
514 name of a bus system, i.e. the way the CPU talks to the other stuff
515 inside your box. If you have an Apple machine, say N here; if you
516 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
517 you have an embedded board, consult your board documentation.
523 config GENERIC_ISA_DMA
525 depends on PPC64 || POWER4 || 6xx && !CPM2
528 config PPC_INDIRECT_PCI
531 default y if 40x || 44x
545 select PPC_INDIRECT_PCI
553 Freescale Localbus support
557 depends on PPC_83xx || QUICC_ENGINE || CPM2
559 Freescale General-purpose Timers support
561 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
566 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
567 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
569 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
570 && !PPC_85xx && !PPC_86xx
571 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
572 default PCI_QSPAN if !4xx && !CPM2 && 8xx
573 select ARCH_SUPPORTS_MSI
575 Find out whether your system includes a PCI bus. PCI is the name of
576 a bus system, i.e. the way the CPU talks to the other stuff inside
577 your box. If you say Y here, the kernel will include drivers and
578 infrastructure code to support PCI bus devices.
588 depends on !4xx && !CPM2 && 8xx
591 Say Y here if you have a system based on a Motorola 8xx-series
592 embedded processor with a QSPAN PCI interface, otherwise say N.
596 depends on PCI && 8260
597 select PPC_INDIRECT_PCI
601 bool "Enable workaround for MPC826x erratum PCI 9"
602 depends on PCI_8260 && !8272
606 prompt "IDMA channel for PCI 9 workaround"
609 config 8260_PCI9_IDMA1
612 config 8260_PCI9_IDMA2
615 config 8260_PCI9_IDMA3
618 config 8260_PCI9_IDMA4
623 source "drivers/pci/pcie/Kconfig"
625 source "drivers/pci/Kconfig"
627 source "drivers/pcmcia/Kconfig"
629 source "drivers/pci/hotplug/Kconfig"
636 bool "RapidIO support"
637 depends on HAS_RAPIDIO
639 If you say Y here, the kernel will include drivers and
640 infrastructure code to support RapidIO interconnect devices.
642 source "drivers/rapidio/Kconfig"
646 menu "Advanced setup"
649 config ADVANCED_OPTIONS
650 bool "Prompt for advanced kernel configuration options"
652 This option will enable prompting for a variety of advanced kernel
653 configuration options. These options can cause the kernel to not
654 work if they are set incorrectly, but can be used to optimize certain
655 aspects of kernel memory management.
657 Unless you know what you are doing, say N here.
659 comment "Default settings for advanced configuration options are used"
660 depends on !ADVANCED_OPTIONS
662 config LOWMEM_SIZE_BOOL
663 bool "Set maximum low memory"
664 depends on ADVANCED_OPTIONS
666 This option allows you to set the maximum amount of memory which
667 will be used as "low memory", that is, memory which the kernel can
668 access directly, without having to set up a kernel virtual mapping.
669 This can be useful in optimizing the layout of kernel virtual
672 Say N here unless you know what you are doing.
675 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
679 bool "Build a relocatable kernel (EXPERIMENTAL)"
680 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
682 This builds a kernel image that is capable of running at the
683 location the kernel is loaded at (some alignment restrictions may
686 One use is for the kexec on panic case where the recovery kernel
687 must live at a different physical address than the primary
690 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
691 it has been loaded at and the compile time physical addresses
692 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
693 setting can still be useful to bootwrappers that need to know the
694 load location of the kernel (eg. u-boot/mkimage).
696 config PAGE_OFFSET_BOOL
697 bool "Set custom page offset address"
698 depends on ADVANCED_OPTIONS
700 This option allows you to set the kernel virtual address at which
701 the kernel will map low memory. This can be useful in optimizing
702 the virtual memory layout of the system.
704 Say N here unless you know what you are doing.
707 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
710 config KERNEL_START_BOOL
711 bool "Set custom kernel base address"
712 depends on ADVANCED_OPTIONS
714 This option allows you to set the kernel virtual address at which
715 the kernel will be loaded. Normally this should match PAGE_OFFSET
716 however there are times (like kdump) that one might not want them
719 Say N here unless you know what you are doing.
722 hex "Virtual address of kernel base" if KERNEL_START_BOOL
723 default PAGE_OFFSET if PAGE_OFFSET_BOOL
724 default "0xc2000000" if CRASH_DUMP
727 config PHYSICAL_START_BOOL
728 bool "Set physical address where the kernel is loaded"
729 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
731 This gives the physical address where the kernel is loaded.
733 Say N here unless you know what you are doing.
735 config PHYSICAL_START
736 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
737 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
740 config PHYSICAL_ALIGN
742 default "0x10000000" if FSL_BOOKE
744 This value puts the alignment restrictions on physical address
745 where kernel is loaded and run from. Kernel is compiled for an
746 address which meets above alignment restriction.
748 config TASK_SIZE_BOOL
749 bool "Set custom user task size"
750 depends on ADVANCED_OPTIONS
752 This option allows you to set the amount of virtual address space
753 allocated to user tasks. This can be useful in optimizing the
754 virtual memory layout of the system.
756 Say N here unless you know what you are doing.
759 hex "Size of user task space" if TASK_SIZE_BOOL
760 default "0x80000000" if PPC_PREP || PPC_8xx
763 config CONSISTENT_START_BOOL
764 bool "Set custom consistent memory pool address"
765 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
767 This option allows you to set the base virtual address
768 of the consistent memory pool. This pool of virtual
769 memory is used to make consistent memory allocations.
771 config CONSISTENT_START
772 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
773 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
774 default "0xff100000" if NOT_COHERENT_CACHE
776 config CONSISTENT_SIZE_BOOL
777 bool "Set custom consistent memory pool size"
778 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
780 This option allows you to set the size of the
781 consistent memory pool. This pool of virtual memory
782 is used to make consistent memory allocations.
784 config CONSISTENT_SIZE
785 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
786 default "0x00200000" if NOT_COHERENT_CACHE
789 bool "Pinned Kernel TLBs (860 ONLY)"
790 depends on ADVANCED_OPTIONS && 8xx
796 default "0xc000000000000000"
799 default "0xc000000002000000" if CRASH_DUMP
800 default "0xc000000000000000"
801 config PHYSICAL_START
803 default "0x02000000" if CRASH_DUMP
809 source "drivers/Kconfig"
813 # XXX source "arch/ppc/8xx_io/Kconfig"
815 # XXX source "arch/ppc/8260_io/Kconfig"
817 source "arch/powerpc/sysdev/qe_lib/Kconfig"
821 source "arch/powerpc/Kconfig.debug"
823 source "security/Kconfig"
827 depends on COMPAT && KEYS
830 source "crypto/Kconfig"
839 source "arch/powerpc/kvm/Kconfig"