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
115 select HAVE_ARCH_KGDB
116 select HAVE_KRETPROBES
118 select HAVE_DMA_ATTRS if PPC64
119 select USE_GENERIC_SMP_HELPERS if SMP
129 select COMPAT_BINFMT_ELF
131 config SYSVIPC_COMPAT
133 depends on COMPAT && SYSVIPC
136 # All PPC32s use generic nvram driver through ppc_md
141 config SCHED_NO_NO_OMIT_FRAME_POINTER
145 config ARCH_MAY_HAVE_PC_FDC
147 default !PPC_PSERIES || PCI
155 config PPC_UDBG_16550
159 config GENERIC_TBSYNC
161 default y if PPC32 && SMP
173 config SYS_SUPPORTS_APM_EMULATION
174 default y if PMAC_APM_EMU
177 config DEFAULT_UIMAGE
180 Used to allow a board to specify it wants a uImage built by default
188 depends on (PPC_PMAC && !SMP) || BROKEN
193 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
196 config ARCH_HIBERNATION_POSSIBLE
198 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
201 config ARCH_SUSPEND_POSSIBLE
203 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
205 config PPC_DCR_NATIVE
215 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
218 config PPC_OF_PLATFORM_PCI
221 depends on PPC64 # not supported on 32 bits yet
224 source "init/Kconfig"
226 source "arch/powerpc/sysdev/Kconfig"
227 source "arch/powerpc/platforms/Kconfig"
229 menu "Kernel options"
232 bool "High memory support"
235 source kernel/time/Kconfig
236 source kernel/Kconfig.hz
237 source kernel/Kconfig.preempt
238 source "fs/Kconfig.binfmt"
240 config HUGETLB_PAGE_SIZE_VARIABLE
242 depends on HUGETLB_PAGE
245 config MATH_EMULATION
246 bool "Math emulation"
247 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
249 Some PowerPC chips designed for embedded applications do not have
250 a floating-point unit and therefore do not implement the
251 floating-point instructions in the PowerPC instruction set. If you
252 say Y here, the kernel will include code to emulate a floating-point
253 unit, which will allow programs that use floating-point
256 config 8XX_MINIMAL_FPEMU
257 bool "Minimal math emulation for 8xx"
258 depends on 8xx && !MATH_EMULATION
260 Older arch/ppc kernels still emulated a few floating point
261 instructions such as load and store, even when full math
262 emulation is disabled. Say "Y" here if you want to preserve
265 It is recommended that you build a soft-float userspace instead.
268 bool "Enable IOMMU virtual merging"
272 Cause IO segments sent to a device for DMA to be merged virtually
273 by the IOMMU when they happen to have been allocated contiguously.
274 This doesn't add pressure to the IOMMU allocator. However, some
275 drivers don't support getting large merged segments coming back
278 Most drivers don't have this problem; it is safe to say Y here.
284 bool "Support for enabling/disabling CPUs"
285 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
287 Say Y here to be able to disable and re-enable individual
288 CPUs at runtime on SMP machines.
290 Say N if you are unsure.
292 config ARCH_ENABLE_MEMORY_HOTPLUG
295 config ARCH_HAS_WALK_MEMORY
298 config ARCH_ENABLE_MEMORY_HOTREMOVE
302 bool "kexec system call (EXPERIMENTAL)"
303 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
305 kexec is a system call that implements the ability to shutdown your
306 current kernel, and to start another kernel. It is like a reboot
307 but it is independent of the system firmware. And like a reboot
308 you can start any kernel with it, not just Linux.
310 The name comes from the similarity to the exec system call.
312 It is an ongoing process to be certain the hardware in a machine
313 is properly shutdown, so do not be surprised if this code does not
314 initially work for you. It may help to enable device hotplugging
315 support. As of this writing the exact hardware interface is
316 strongly in flux, so no good recommendation can be made.
319 bool "Build a kdump crash kernel"
320 depends on PPC_MULTIPLATFORM && PPC64
322 Build a kernel suitable for use as a kdump capture kernel.
323 The kernel will be linked at a different address than normal, and
324 so can only be used for Kdump.
326 Don't change this unless you know what you are doing.
329 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
330 depends on PPC_PSERIES && EXPERIMENTAL
332 Hypervisor-assisted dump is meant to be a kdump replacement
333 offering robustness and speed not possible without system
334 hypervisor assistence.
339 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
340 default y if PPC_PREP
343 bool "Distribute interrupts on all CPUs by default"
344 depends on SMP && !MV64360
346 This option gives the kernel permission to distribute IRQs across
347 multiple CPUs. Saying N here will route all IRQs to the first
348 CPU. Generally saying Y is safe, although some problems have been
349 reported with SMP Power Macintoshes with this option enabled.
354 default y if SMP && PPC_PSERIES
359 depends on NEED_MULTIPLE_NODES
361 config ARCH_SELECT_MEMORY_MODEL
365 config ARCH_FLATMEM_ENABLE
367 depends on (PPC64 && !NUMA) || PPC32
369 config ARCH_SPARSEMEM_ENABLE
372 select SPARSEMEM_VMEMMAP_ENABLE
374 config ARCH_SPARSEMEM_DEFAULT
376 depends on (SMP && PPC_PSERIES) || PPC_PS3
378 config ARCH_POPULATES_NODE_MAP
383 config ARCH_MEMORY_PROBE
385 depends on MEMORY_HOTPLUG
387 # Some NUMA nodes have memory ranges that span
388 # other nodes. Even though a pfn is valid and
389 # between a node's start and end pfns, it may not
390 # reside on that node. See memmap_init_zone()
392 config NODES_SPAN_OTHER_NODES
394 depends on NEED_MULTIPLE_NODES
396 config PPC_HAS_HASH_64K
404 select PPC_HAS_HASH_64K
406 This option changes the kernel logical page size to 64k. On machines
407 without processor support for 64k pages, the kernel will simulate
408 them by loading each individual 4k page on demand transparently,
409 while on hardware with such support, it will be used to map
410 normal application pages.
412 config FORCE_MAX_ZONEORDER
413 int "Maximum zone order"
414 default "9" if PPC_64K_PAGES
415 default "13" if PPC64 && !PPC_64K_PAGES
418 The kernel memory allocator divides physically contiguous memory
419 blocks into "zones", where each zone is a power of two number of
420 pages. This option selects the largest power of two that the kernel
421 keeps in the memory allocator. If you need to allocate very large
422 blocks of physically contiguous memory, then you may need to
425 This config option is actually maximum order plus one. For example,
426 a value of 11 means that the largest free memory block is 2^10 pages.
428 The page size is not necessarily 4KB. For example, on 64-bit
429 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
430 this in mind when choosing a value for this option.
432 config PPC_SUBPAGE_PROT
433 bool "Support setting protections for 4k subpages"
434 depends on PPC_64K_PAGES
436 This option adds support for a system call to allow user programs
437 to set access permissions (read/write, readonly, or no access)
438 on the 4k subpages of each 64k page.
441 bool "SMT (Hyperthreading) scheduler support"
442 depends on PPC64 && SMP
444 SMT scheduler support improves the CPU scheduler's decision making
445 when dealing with POWER5 cpus at a cost of slightly increased
446 overhead in some places. If unsure say N here.
448 config PROC_DEVICETREE
449 bool "Support for device tree in /proc"
452 This option adds a device-tree directory under /proc which contains
453 an image of the device tree that the kernel copies from Open
454 Firmware or other boot firmware. If unsure, say Y here.
457 bool "Default bootloader kernel arguments"
460 string "Initial kernel command string"
461 depends on CMDLINE_BOOL
462 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
464 On some platforms, there is currently no way for the boot loader to
465 pass arguments to the kernel. For these platforms, you can supply
466 some command-line options at build time by entering them here. In
467 most cases you will need to specify the root device here.
470 string "Additional default image types"
472 List additional targets to be built by the bootwrapper here (separated
473 by spaces). This is useful for targets that depend of device tree
474 files in the .dts directory.
476 Targets in this list will be build as part of the default build
477 target, or when the user does a 'make zImage' or a
478 'make zImage.initrd'.
480 If unsure, leave blank
483 config ARCH_WANTS_FREEZER_CONTROL
487 source kernel/power/Kconfig
491 bool "Enable seccomp to safely compute untrusted bytecode"
495 This kernel feature is useful for number crunching applications
496 that may need to compute untrusted bytecode during their
497 execution. By using pipes or other transports made available to
498 the process as file descriptors supporting the read/write
499 syscalls, it's possible to isolate those applications in
500 their own address space using seccomp. Once seccomp is
501 enabled via /proc/<pid>/seccomp, it cannot be disabled
502 and the task is only allowed to execute a few safe syscalls
503 defined by each seccomp mode.
505 If unsure, say Y. Only embedded should say N here.
511 default !PPC_ISERIES || PCI
516 bool "Support for ISA-bus hardware"
517 depends on PPC_PREP || PPC_CHRP
520 Find out whether you have ISA slots on your motherboard. ISA is the
521 name of a bus system, i.e. the way the CPU talks to the other stuff
522 inside your box. If you have an Apple machine, say N here; if you
523 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
524 you have an embedded board, consult your board documentation.
530 config GENERIC_ISA_DMA
532 depends on PPC64 || POWER4 || 6xx && !CPM2
535 config PPC_INDIRECT_PCI
538 default y if 40x || 44x
552 select PPC_INDIRECT_PCI
560 Freescale Localbus support
564 depends on PPC_83xx || QUICC_ENGINE || CPM2
566 Freescale General-purpose Timers support
568 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
572 # Platforms that what PCI turned unconditionally just do select PCI
573 # in their config node. Platforms that want to choose at config
574 # time should select PPC_PCI_CHOICE
575 config PPC_PCI_CHOICE
579 bool "PCI support" if PPC_PCI_CHOICE
580 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
581 && !PPC_85xx && !PPC_86xx
582 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
583 default PCI_QSPAN if !4xx && !CPM2 && 8xx
584 select ARCH_SUPPORTS_MSI
586 Find out whether your system includes a PCI bus. PCI is the name of
587 a bus system, i.e. the way the CPU talks to the other stuff inside
588 your box. If you say Y here, the kernel will include drivers and
589 infrastructure code to support PCI bus devices.
599 depends on !4xx && !CPM2 && 8xx
602 Say Y here if you have a system based on a Motorola 8xx-series
603 embedded processor with a QSPAN PCI interface, otherwise say N.
607 depends on PCI && 8260
608 select PPC_INDIRECT_PCI
612 bool "Enable workaround for MPC826x erratum PCI 9"
613 depends on PCI_8260 && !8272
617 prompt "IDMA channel for PCI 9 workaround"
620 config 8260_PCI9_IDMA1
623 config 8260_PCI9_IDMA2
626 config 8260_PCI9_IDMA3
629 config 8260_PCI9_IDMA4
634 source "drivers/pci/pcie/Kconfig"
636 source "drivers/pci/Kconfig"
638 source "drivers/pcmcia/Kconfig"
640 source "drivers/pci/hotplug/Kconfig"
647 bool "RapidIO support"
648 depends on HAS_RAPIDIO
650 If you say Y here, the kernel will include drivers and
651 infrastructure code to support RapidIO interconnect devices.
653 source "drivers/rapidio/Kconfig"
657 menu "Advanced setup"
660 config ADVANCED_OPTIONS
661 bool "Prompt for advanced kernel configuration options"
663 This option will enable prompting for a variety of advanced kernel
664 configuration options. These options can cause the kernel to not
665 work if they are set incorrectly, but can be used to optimize certain
666 aspects of kernel memory management.
668 Unless you know what you are doing, say N here.
670 comment "Default settings for advanced configuration options are used"
671 depends on !ADVANCED_OPTIONS
673 config LOWMEM_SIZE_BOOL
674 bool "Set maximum low memory"
675 depends on ADVANCED_OPTIONS
677 This option allows you to set the maximum amount of memory which
678 will be used as "low memory", that is, memory which the kernel can
679 access directly, without having to set up a kernel virtual mapping.
680 This can be useful in optimizing the layout of kernel virtual
683 Say N here unless you know what you are doing.
686 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
690 bool "Build a relocatable kernel (EXPERIMENTAL)"
691 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
693 This builds a kernel image that is capable of running at the
694 location the kernel is loaded at (some alignment restrictions may
697 One use is for the kexec on panic case where the recovery kernel
698 must live at a different physical address than the primary
701 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
702 it has been loaded at and the compile time physical addresses
703 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
704 setting can still be useful to bootwrappers that need to know the
705 load location of the kernel (eg. u-boot/mkimage).
707 config PAGE_OFFSET_BOOL
708 bool "Set custom page offset address"
709 depends on ADVANCED_OPTIONS
711 This option allows you to set the kernel virtual address at which
712 the kernel will map low memory. This can be useful in optimizing
713 the virtual memory layout of the system.
715 Say N here unless you know what you are doing.
718 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
721 config KERNEL_START_BOOL
722 bool "Set custom kernel base address"
723 depends on ADVANCED_OPTIONS
725 This option allows you to set the kernel virtual address at which
726 the kernel will be loaded. Normally this should match PAGE_OFFSET
727 however there are times (like kdump) that one might not want them
730 Say N here unless you know what you are doing.
733 hex "Virtual address of kernel base" if KERNEL_START_BOOL
734 default PAGE_OFFSET if PAGE_OFFSET_BOOL
735 default "0xc2000000" if CRASH_DUMP
738 config PHYSICAL_START_BOOL
739 bool "Set physical address where the kernel is loaded"
740 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
742 This gives the physical address where the kernel is loaded.
744 Say N here unless you know what you are doing.
746 config PHYSICAL_START
747 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
748 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
751 config PHYSICAL_ALIGN
753 default "0x10000000" if FSL_BOOKE
755 This value puts the alignment restrictions on physical address
756 where kernel is loaded and run from. Kernel is compiled for an
757 address which meets above alignment restriction.
759 config TASK_SIZE_BOOL
760 bool "Set custom user task size"
761 depends on ADVANCED_OPTIONS
763 This option allows you to set the amount of virtual address space
764 allocated to user tasks. This can be useful in optimizing the
765 virtual memory layout of the system.
767 Say N here unless you know what you are doing.
770 hex "Size of user task space" if TASK_SIZE_BOOL
771 default "0x80000000" if PPC_PREP || PPC_8xx
774 config CONSISTENT_START_BOOL
775 bool "Set custom consistent memory pool address"
776 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
778 This option allows you to set the base virtual address
779 of the consistent memory pool. This pool of virtual
780 memory is used to make consistent memory allocations.
782 config CONSISTENT_START
783 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
784 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
785 default "0xff100000" if NOT_COHERENT_CACHE
787 config CONSISTENT_SIZE_BOOL
788 bool "Set custom consistent memory pool size"
789 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
791 This option allows you to set the size of the
792 consistent memory pool. This pool of virtual memory
793 is used to make consistent memory allocations.
795 config CONSISTENT_SIZE
796 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
797 default "0x00200000" if NOT_COHERENT_CACHE
800 bool "Pinned Kernel TLBs (860 ONLY)"
801 depends on ADVANCED_OPTIONS && 8xx
807 default "0xc000000000000000"
810 default "0xc000000002000000" if CRASH_DUMP
811 default "0xc000000000000000"
812 config PHYSICAL_START
814 default "0x02000000" if CRASH_DUMP
820 source "drivers/Kconfig"
824 # XXX source "arch/ppc/8xx_io/Kconfig"
826 # XXX source "arch/ppc/8260_io/Kconfig"
828 source "arch/powerpc/sysdev/qe_lib/Kconfig"
832 source "arch/powerpc/Kconfig.debug"
834 source "security/Kconfig"
838 depends on COMPAT && KEYS
841 source "crypto/Kconfig"
850 source "arch/powerpc/kvm/Kconfig"