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
114 select HAVE_KRETPROBES
116 select HAVE_DMA_ATTRS
125 select COMPAT_BINFMT_ELF
127 config SYSVIPC_COMPAT
129 depends on COMPAT && SYSVIPC
132 # All PPC32s use generic nvram driver through ppc_md
137 config SCHED_NO_NO_OMIT_FRAME_POINTER
141 config ARCH_MAY_HAVE_PC_FDC
143 default !PPC_PSERIES || PCI
151 config PPC_UDBG_16550
155 config GENERIC_TBSYNC
157 default y if PPC32 && SMP
169 config SYS_SUPPORTS_APM_EMULATION
170 default y if PMAC_APM_EMU
173 config DEFAULT_UIMAGE
176 Used to allow a board to specify it wants a uImage built by default
184 depends on (PPC_PMAC && !SMP) || BROKEN
189 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
192 config ARCH_HIBERNATION_POSSIBLE
194 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
197 config ARCH_SUSPEND_POSSIBLE
199 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
201 config PPC_DCR_NATIVE
211 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
214 config PPC_OF_PLATFORM_PCI
217 depends on PPC64 # not supported on 32 bits yet
220 source "init/Kconfig"
222 source "arch/powerpc/sysdev/Kconfig"
223 source "arch/powerpc/platforms/Kconfig"
225 menu "Kernel options"
228 bool "High memory support"
231 source kernel/time/Kconfig
232 source kernel/Kconfig.hz
233 source kernel/Kconfig.preempt
234 source "fs/Kconfig.binfmt"
236 config HUGETLB_PAGE_SIZE_VARIABLE
238 depends on HUGETLB_PAGE
241 config MATH_EMULATION
242 bool "Math emulation"
243 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
245 Some PowerPC chips designed for embedded applications do not have
246 a floating-point unit and therefore do not implement the
247 floating-point instructions in the PowerPC instruction set. If you
248 say Y here, the kernel will include code to emulate a floating-point
249 unit, which will allow programs that use floating-point
252 config 8XX_MINIMAL_FPEMU
253 bool "Minimal math emulation for 8xx"
254 depends on 8xx && !MATH_EMULATION
256 Older arch/ppc kernels still emulated a few floating point
257 instructions such as load and store, even when full math
258 emulation is disabled. Say "Y" here if you want to preserve
261 It is recommended that you build a soft-float userspace instead.
264 bool "Enable IOMMU virtual merging"
268 Cause IO segments sent to a device for DMA to be merged virtually
269 by the IOMMU when they happen to have been allocated contiguously.
270 This doesn't add pressure to the IOMMU allocator. However, some
271 drivers don't support getting large merged segments coming back
274 Most drivers don't have this problem; it is safe to say Y here.
280 bool "Support for enabling/disabling CPUs"
281 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
283 Say Y here to be able to disable and re-enable individual
284 CPUs at runtime on SMP machines.
286 Say N if you are unsure.
288 config ARCH_ENABLE_MEMORY_HOTPLUG
291 config ARCH_HAS_WALK_MEMORY
294 config ARCH_ENABLE_MEMORY_HOTREMOVE
298 bool "kexec system call (EXPERIMENTAL)"
299 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
301 kexec is a system call that implements the ability to shutdown your
302 current kernel, and to start another kernel. It is like a reboot
303 but it is independent of the system firmware. And like a reboot
304 you can start any kernel with it, not just Linux.
306 The name comes from the similarity to the exec system call.
308 It is an ongoing process to be certain the hardware in a machine
309 is properly shutdown, so do not be surprised if this code does not
310 initially work for you. It may help to enable device hotplugging
311 support. As of this writing the exact hardware interface is
312 strongly in flux, so no good recommendation can be made.
315 bool "Build a kdump crash kernel"
316 depends on PPC_MULTIPLATFORM && PPC64
318 Build a kernel suitable for use as a kdump capture kernel.
319 The kernel will be linked at a different address than normal, and
320 so can only be used for Kdump.
322 Don't change this unless you know what you are doing.
325 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
326 depends on PPC_PSERIES && EXPERIMENTAL
328 Hypervisor-assisted dump is meant to be a kdump replacement
329 offering robustness and speed not possible without system
330 hypervisor assistence.
335 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
336 default y if PPC_PREP
339 bool "Distribute interrupts on all CPUs by default"
340 depends on SMP && !MV64360
342 This option gives the kernel permission to distribute IRQs across
343 multiple CPUs. Saying N here will route all IRQs to the first
344 CPU. Generally saying Y is safe, although some problems have been
345 reported with SMP Power Macintoshes with this option enabled.
350 default y if SMP && PPC_PSERIES
355 depends on NEED_MULTIPLE_NODES
357 config ARCH_SELECT_MEMORY_MODEL
361 config ARCH_FLATMEM_ENABLE
363 depends on (PPC64 && !NUMA) || PPC32
365 config ARCH_SPARSEMEM_ENABLE
368 select SPARSEMEM_VMEMMAP_ENABLE
370 config ARCH_SPARSEMEM_DEFAULT
372 depends on (SMP && PPC_PSERIES) || PPC_PS3
374 config ARCH_POPULATES_NODE_MAP
379 config ARCH_MEMORY_PROBE
381 depends on MEMORY_HOTPLUG
383 # Some NUMA nodes have memory ranges that span
384 # other nodes. Even though a pfn is valid and
385 # between a node's start and end pfns, it may not
386 # reside on that node. See memmap_init_zone()
388 config NODES_SPAN_OTHER_NODES
390 depends on NEED_MULTIPLE_NODES
392 config PPC_HAS_HASH_64K
400 select PPC_HAS_HASH_64K
402 This option changes the kernel logical page size to 64k. On machines
403 without processor support for 64k pages, the kernel will simulate
404 them by loading each individual 4k page on demand transparently,
405 while on hardware with such support, it will be used to map
406 normal application pages.
408 config FORCE_MAX_ZONEORDER
409 int "Maximum zone order"
410 default "9" if PPC_64K_PAGES
411 default "13" if PPC64 && !PPC_64K_PAGES
414 The kernel memory allocator divides physically contiguous memory
415 blocks into "zones", where each zone is a power of two number of
416 pages. This option selects the largest power of two that the kernel
417 keeps in the memory allocator. If you need to allocate very large
418 blocks of physically contiguous memory, then you may need to
421 This config option is actually maximum order plus one. For example,
422 a value of 11 means that the largest free memory block is 2^10 pages.
424 The page size is not necessarily 4KB. For example, on 64-bit
425 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
426 this in mind when choosing a value for this option.
428 config PPC_SUBPAGE_PROT
429 bool "Support setting protections for 4k subpages"
430 depends on PPC_64K_PAGES
432 This option adds support for a system call to allow user programs
433 to set access permissions (read/write, readonly, or no access)
434 on the 4k subpages of each 64k page.
437 bool "SMT (Hyperthreading) scheduler support"
438 depends on PPC64 && SMP
440 SMT scheduler support improves the CPU scheduler's decision making
441 when dealing with POWER5 cpus at a cost of slightly increased
442 overhead in some places. If unsure say N here.
444 config PROC_DEVICETREE
445 bool "Support for device tree in /proc"
448 This option adds a device-tree directory under /proc which contains
449 an image of the device tree that the kernel copies from Open
450 Firmware or other boot firmware. If unsure, say Y here.
453 bool "Default bootloader kernel arguments"
456 string "Initial kernel command string"
457 depends on CMDLINE_BOOL
458 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
460 On some platforms, there is currently no way for the boot loader to
461 pass arguments to the kernel. For these platforms, you can supply
462 some command-line options at build time by entering them here. In
463 most cases you will need to specify the root device here.
466 string "Additional default image types"
468 List additional targets to be built by the bootwrapper here (separated
469 by spaces). This is useful for targets that depend of device tree
470 files in the .dts directory.
472 Targets in this list will be build as part of the default build
473 target, or when the user does a 'make zImage' or a
474 'make zImage.initrd'.
476 If unsure, leave blank
479 config ARCH_WANTS_FREEZER_CONTROL
483 source kernel/power/Kconfig
487 bool "Enable seccomp to safely compute untrusted bytecode"
491 This kernel feature is useful for number crunching applications
492 that may need to compute untrusted bytecode during their
493 execution. By using pipes or other transports made available to
494 the process as file descriptors supporting the read/write
495 syscalls, it's possible to isolate those applications in
496 their own address space using seccomp. Once seccomp is
497 enabled via /proc/<pid>/seccomp, it cannot be disabled
498 and the task is only allowed to execute a few safe syscalls
499 defined by each seccomp mode.
501 If unsure, say Y. Only embedded should say N here.
507 default !PPC_ISERIES || PCI
512 bool "Support for ISA-bus hardware"
513 depends on PPC_PREP || PPC_CHRP
516 Find out whether you have ISA slots on your motherboard. ISA is the
517 name of a bus system, i.e. the way the CPU talks to the other stuff
518 inside your box. If you have an Apple machine, say N here; if you
519 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
520 you have an embedded board, consult your board documentation.
526 config GENERIC_ISA_DMA
528 depends on PPC64 || POWER4 || 6xx && !CPM2
531 config PPC_INDIRECT_PCI
534 default y if 40x || 44x
548 select PPC_INDIRECT_PCI
556 Freescale Localbus support
560 depends on PPC_83xx || QUICC_ENGINE || CPM2
562 Freescale General-purpose Timers support
564 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
569 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
570 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
572 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
573 && !PPC_85xx && !PPC_86xx
574 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
575 default PCI_QSPAN if !4xx && !CPM2 && 8xx
576 select ARCH_SUPPORTS_MSI
578 Find out whether your system includes a PCI bus. PCI is the name of
579 a bus system, i.e. the way the CPU talks to the other stuff inside
580 your box. If you say Y here, the kernel will include drivers and
581 infrastructure code to support PCI bus devices.
591 depends on !4xx && !CPM2 && 8xx
594 Say Y here if you have a system based on a Motorola 8xx-series
595 embedded processor with a QSPAN PCI interface, otherwise say N.
599 depends on PCI && 8260
600 select PPC_INDIRECT_PCI
604 bool "Enable workaround for MPC826x erratum PCI 9"
605 depends on PCI_8260 && !8272
609 prompt "IDMA channel for PCI 9 workaround"
612 config 8260_PCI9_IDMA1
615 config 8260_PCI9_IDMA2
618 config 8260_PCI9_IDMA3
621 config 8260_PCI9_IDMA4
626 source "drivers/pci/pcie/Kconfig"
628 source "drivers/pci/Kconfig"
630 source "drivers/pcmcia/Kconfig"
632 source "drivers/pci/hotplug/Kconfig"
639 bool "RapidIO support"
640 depends on HAS_RAPIDIO
642 If you say Y here, the kernel will include drivers and
643 infrastructure code to support RapidIO interconnect devices.
645 source "drivers/rapidio/Kconfig"
649 menu "Advanced setup"
652 config ADVANCED_OPTIONS
653 bool "Prompt for advanced kernel configuration options"
655 This option will enable prompting for a variety of advanced kernel
656 configuration options. These options can cause the kernel to not
657 work if they are set incorrectly, but can be used to optimize certain
658 aspects of kernel memory management.
660 Unless you know what you are doing, say N here.
662 comment "Default settings for advanced configuration options are used"
663 depends on !ADVANCED_OPTIONS
665 config LOWMEM_SIZE_BOOL
666 bool "Set maximum low memory"
667 depends on ADVANCED_OPTIONS
669 This option allows you to set the maximum amount of memory which
670 will be used as "low memory", that is, memory which the kernel can
671 access directly, without having to set up a kernel virtual mapping.
672 This can be useful in optimizing the layout of kernel virtual
675 Say N here unless you know what you are doing.
678 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
682 bool "Build a relocatable kernel (EXPERIMENTAL)"
683 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
685 This builds a kernel image that is capable of running at the
686 location the kernel is loaded at (some alignment restrictions may
689 One use is for the kexec on panic case where the recovery kernel
690 must live at a different physical address than the primary
693 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
694 it has been loaded at and the compile time physical addresses
695 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
696 setting can still be useful to bootwrappers that need to know the
697 load location of the kernel (eg. u-boot/mkimage).
699 config PAGE_OFFSET_BOOL
700 bool "Set custom page offset address"
701 depends on ADVANCED_OPTIONS
703 This option allows you to set the kernel virtual address at which
704 the kernel will map low memory. This can be useful in optimizing
705 the virtual memory layout of the system.
707 Say N here unless you know what you are doing.
710 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
713 config KERNEL_START_BOOL
714 bool "Set custom kernel base address"
715 depends on ADVANCED_OPTIONS
717 This option allows you to set the kernel virtual address at which
718 the kernel will be loaded. Normally this should match PAGE_OFFSET
719 however there are times (like kdump) that one might not want them
722 Say N here unless you know what you are doing.
725 hex "Virtual address of kernel base" if KERNEL_START_BOOL
726 default PAGE_OFFSET if PAGE_OFFSET_BOOL
727 default "0xc2000000" if CRASH_DUMP
730 config PHYSICAL_START_BOOL
731 bool "Set physical address where the kernel is loaded"
732 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
734 This gives the physical address where the kernel is loaded.
736 Say N here unless you know what you are doing.
738 config PHYSICAL_START
739 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
740 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
743 config PHYSICAL_ALIGN
745 default "0x10000000" if FSL_BOOKE
747 This value puts the alignment restrictions on physical address
748 where kernel is loaded and run from. Kernel is compiled for an
749 address which meets above alignment restriction.
751 config TASK_SIZE_BOOL
752 bool "Set custom user task size"
753 depends on ADVANCED_OPTIONS
755 This option allows you to set the amount of virtual address space
756 allocated to user tasks. This can be useful in optimizing the
757 virtual memory layout of the system.
759 Say N here unless you know what you are doing.
762 hex "Size of user task space" if TASK_SIZE_BOOL
763 default "0x80000000" if PPC_PREP || PPC_8xx
766 config CONSISTENT_START_BOOL
767 bool "Set custom consistent memory pool address"
768 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
770 This option allows you to set the base virtual address
771 of the consistent memory pool. This pool of virtual
772 memory is used to make consistent memory allocations.
774 config CONSISTENT_START
775 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
776 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
777 default "0xff100000" if NOT_COHERENT_CACHE
779 config CONSISTENT_SIZE_BOOL
780 bool "Set custom consistent memory pool size"
781 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
783 This option allows you to set the size of the
784 consistent memory pool. This pool of virtual memory
785 is used to make consistent memory allocations.
787 config CONSISTENT_SIZE
788 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
789 default "0x00200000" if NOT_COHERENT_CACHE
792 bool "Pinned Kernel TLBs (860 ONLY)"
793 depends on ADVANCED_OPTIONS && 8xx
799 default "0xc000000000000000"
802 default "0xc000000002000000" if CRASH_DUMP
803 default "0xc000000000000000"
804 config PHYSICAL_START
806 default "0x02000000" if CRASH_DUMP
812 source "drivers/Kconfig"
816 # XXX source "arch/ppc/8xx_io/Kconfig"
818 # XXX source "arch/ppc/8260_io/Kconfig"
820 source "arch/powerpc/sysdev/qe_lib/Kconfig"
824 source "arch/powerpc/Kconfig.debug"
826 source "security/Kconfig"
830 depends on COMPAT && KEYS
833 source "crypto/Kconfig"
842 source "arch/powerpc/kvm/Kconfig"