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
113 select ARCH_WANT_OPTIONAL_GPIOLIB
115 select HAVE_IOREMAP_PROT
116 select HAVE_EFFICIENT_UNALIGNED_ACCESS
118 select HAVE_ARCH_KGDB
119 select HAVE_KRETPROBES
120 select HAVE_ARCH_TRACEHOOK
122 select HAVE_DMA_ATTRS if PPC64
123 select USE_GENERIC_SMP_HELPERS if SMP
125 select HAVE_SYSCALL_WRAPPERS if PPC64
134 select COMPAT_BINFMT_ELF
136 config SYSVIPC_COMPAT
138 depends on COMPAT && SYSVIPC
141 # All PPC32s use generic nvram driver through ppc_md
146 config SCHED_NO_NO_OMIT_FRAME_POINTER
150 config ARCH_MAY_HAVE_PC_FDC
152 default !PPC_PSERIES || PCI
160 config PPC_UDBG_16550
164 config GENERIC_TBSYNC
166 default y if PPC32 && SMP
178 config SYS_SUPPORTS_APM_EMULATION
179 default y if PMAC_APM_EMU
182 config DEFAULT_UIMAGE
185 Used to allow a board to specify it wants a uImage built by default
193 depends on (PPC_PMAC && !SMP) || BROKEN
198 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
201 config ARCH_HIBERNATION_POSSIBLE
203 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
206 config ARCH_SUSPEND_POSSIBLE
208 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
210 config PPC_DCR_NATIVE
220 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
223 config PPC_OF_PLATFORM_PCI
226 depends on PPC64 # not supported on 32 bits yet
229 source "init/Kconfig"
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
327 Build a kernel suitable for use as a kdump capture kernel.
328 The kernel will be linked at a different address than normal, and
329 so can only be used for Kdump.
331 Don't change this unless you know what you are doing.
334 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
335 depends on PPC_PSERIES && EXPERIMENTAL
337 Hypervisor-assisted dump is meant to be a kdump replacement
338 offering robustness and speed not possible without system
339 hypervisor assistence.
344 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
345 default y if PPC_PREP
348 bool "Distribute interrupts on all CPUs by default"
349 depends on SMP && !MV64360
351 This option gives the kernel permission to distribute IRQs across
352 multiple CPUs. Saying N here will route all IRQs to the first
353 CPU. Generally saying Y is safe, although some problems have been
354 reported with SMP Power Macintoshes with this option enabled.
359 default y if SMP && PPC_PSERIES
364 depends on NEED_MULTIPLE_NODES
366 config ARCH_SELECT_MEMORY_MODEL
370 config ARCH_FLATMEM_ENABLE
372 depends on (PPC64 && !NUMA) || PPC32
374 config ARCH_SPARSEMEM_ENABLE
377 select SPARSEMEM_VMEMMAP_ENABLE
379 config ARCH_SPARSEMEM_DEFAULT
381 depends on (SMP && PPC_PSERIES) || PPC_PS3
383 config ARCH_POPULATES_NODE_MAP
388 config ARCH_MEMORY_PROBE
390 depends on MEMORY_HOTPLUG
392 # Some NUMA nodes have memory ranges that span
393 # other nodes. Even though a pfn is valid and
394 # between a node's start and end pfns, it may not
395 # reside on that node. See memmap_init_zone()
397 config NODES_SPAN_OTHER_NODES
399 depends on NEED_MULTIPLE_NODES
401 config PPC_HAS_HASH_64K
409 select PPC_HAS_HASH_64K
411 This option changes the kernel logical page size to 64k. On machines
412 without processor support for 64k pages, the kernel will simulate
413 them by loading each individual 4k page on demand transparently,
414 while on hardware with such support, it will be used to map
415 normal application pages.
417 config FORCE_MAX_ZONEORDER
418 int "Maximum zone order"
419 default "9" if PPC_64K_PAGES
420 default "13" if PPC64 && !PPC_64K_PAGES
423 The kernel memory allocator divides physically contiguous memory
424 blocks into "zones", where each zone is a power of two number of
425 pages. This option selects the largest power of two that the kernel
426 keeps in the memory allocator. If you need to allocate very large
427 blocks of physically contiguous memory, then you may need to
430 This config option is actually maximum order plus one. For example,
431 a value of 11 means that the largest free memory block is 2^10 pages.
433 The page size is not necessarily 4KB. For example, on 64-bit
434 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
435 this in mind when choosing a value for this option.
437 config PPC_SUBPAGE_PROT
438 bool "Support setting protections for 4k subpages"
439 depends on PPC_64K_PAGES
441 This option adds support for a system call to allow user programs
442 to set access permissions (read/write, readonly, or no access)
443 on the 4k subpages of each 64k page.
446 bool "SMT (Hyperthreading) scheduler support"
447 depends on PPC64 && SMP
449 SMT scheduler support improves the CPU scheduler's decision making
450 when dealing with POWER5 cpus at a cost of slightly increased
451 overhead in some places. If unsure say N here.
453 config PROC_DEVICETREE
454 bool "Support for device tree in /proc"
457 This option adds a device-tree directory under /proc which contains
458 an image of the device tree that the kernel copies from Open
459 Firmware or other boot firmware. If unsure, say Y here.
462 bool "Default bootloader kernel arguments"
465 string "Initial kernel command string"
466 depends on CMDLINE_BOOL
467 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
469 On some platforms, there is currently no way for the boot loader to
470 pass arguments to the kernel. For these platforms, you can supply
471 some command-line options at build time by entering them here. In
472 most cases you will need to specify the root device here.
475 string "Additional default image types"
477 List additional targets to be built by the bootwrapper here (separated
478 by spaces). This is useful for targets that depend of device tree
479 files in the .dts directory.
481 Targets in this list will be build as part of the default build
482 target, or when the user does a 'make zImage' or a
483 'make zImage.initrd'.
485 If unsure, leave blank
488 config ARCH_WANTS_FREEZER_CONTROL
492 source kernel/power/Kconfig
496 bool "Enable seccomp to safely compute untrusted bytecode"
500 This kernel feature is useful for number crunching applications
501 that may need to compute untrusted bytecode during their
502 execution. By using pipes or other transports made available to
503 the process as file descriptors supporting the read/write
504 syscalls, it's possible to isolate those applications in
505 their own address space using seccomp. Once seccomp is
506 enabled via /proc/<pid>/seccomp, it cannot be disabled
507 and the task is only allowed to execute a few safe syscalls
508 defined by each seccomp mode.
510 If unsure, say Y. Only embedded should say N here.
516 default !PPC_ISERIES || PCI
521 bool "Support for ISA-bus hardware"
522 depends on PPC_PREP || PPC_CHRP
525 Find out whether you have ISA slots on your motherboard. ISA is the
526 name of a bus system, i.e. the way the CPU talks to the other stuff
527 inside your box. If you have an Apple machine, say N here; if you
528 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
529 you have an embedded board, consult your board documentation.
535 config GENERIC_ISA_DMA
537 depends on PPC64 || POWER4 || 6xx && !CPM2
540 config PPC_INDIRECT_PCI
543 default y if 40x || 44x
557 select PPC_INDIRECT_PCI
565 Freescale Localbus support
569 depends on PPC_83xx || QUICC_ENGINE || CPM2
571 Freescale General-purpose Timers support
573 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
577 # Platforms that what PCI turned unconditionally just do select PCI
578 # in their config node. Platforms that want to choose at config
579 # time should select PPC_PCI_CHOICE
580 config PPC_PCI_CHOICE
584 bool "PCI support" if PPC_PCI_CHOICE
585 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
586 && !PPC_85xx && !PPC_86xx
587 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
588 default PCI_QSPAN if !4xx && !CPM2 && 8xx
589 select ARCH_SUPPORTS_MSI
591 Find out whether your system includes a PCI bus. PCI is the name of
592 a bus system, i.e. the way the CPU talks to the other stuff inside
593 your box. If you say Y here, the kernel will include drivers and
594 infrastructure code to support PCI bus devices.
604 depends on !4xx && !CPM2 && 8xx
607 Say Y here if you have a system based on a Motorola 8xx-series
608 embedded processor with a QSPAN PCI interface, otherwise say N.
612 depends on PCI && 8260
613 select PPC_INDIRECT_PCI
617 bool "Enable workaround for MPC826x erratum PCI 9"
618 depends on PCI_8260 && !8272
622 prompt "IDMA channel for PCI 9 workaround"
625 config 8260_PCI9_IDMA1
628 config 8260_PCI9_IDMA2
631 config 8260_PCI9_IDMA3
634 config 8260_PCI9_IDMA4
639 source "drivers/pci/pcie/Kconfig"
641 source "drivers/pci/Kconfig"
643 source "drivers/pcmcia/Kconfig"
645 source "drivers/pci/hotplug/Kconfig"
652 bool "RapidIO support"
653 depends on HAS_RAPIDIO
655 If you say Y here, the kernel will include drivers and
656 infrastructure code to support RapidIO interconnect devices.
658 source "drivers/rapidio/Kconfig"
662 menu "Advanced setup"
665 config ADVANCED_OPTIONS
666 bool "Prompt for advanced kernel configuration options"
668 This option will enable prompting for a variety of advanced kernel
669 configuration options. These options can cause the kernel to not
670 work if they are set incorrectly, but can be used to optimize certain
671 aspects of kernel memory management.
673 Unless you know what you are doing, say N here.
675 comment "Default settings for advanced configuration options are used"
676 depends on !ADVANCED_OPTIONS
678 config LOWMEM_SIZE_BOOL
679 bool "Set maximum low memory"
680 depends on ADVANCED_OPTIONS
682 This option allows you to set the maximum amount of memory which
683 will be used as "low memory", that is, memory which the kernel can
684 access directly, without having to set up a kernel virtual mapping.
685 This can be useful in optimizing the layout of kernel virtual
688 Say N here unless you know what you are doing.
691 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
695 bool "Build a relocatable kernel (EXPERIMENTAL)"
696 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
698 This builds a kernel image that is capable of running at the
699 location the kernel is loaded at (some alignment restrictions may
702 One use is for the kexec on panic case where the recovery kernel
703 must live at a different physical address than the primary
706 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
707 it has been loaded at and the compile time physical addresses
708 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
709 setting can still be useful to bootwrappers that need to know the
710 load location of the kernel (eg. u-boot/mkimage).
712 config PAGE_OFFSET_BOOL
713 bool "Set custom page offset address"
714 depends on ADVANCED_OPTIONS
716 This option allows you to set the kernel virtual address at which
717 the kernel will map low memory. This can be useful in optimizing
718 the virtual memory layout of the system.
720 Say N here unless you know what you are doing.
723 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
726 config KERNEL_START_BOOL
727 bool "Set custom kernel base address"
728 depends on ADVANCED_OPTIONS
730 This option allows you to set the kernel virtual address at which
731 the kernel will be loaded. Normally this should match PAGE_OFFSET
732 however there are times (like kdump) that one might not want them
735 Say N here unless you know what you are doing.
738 hex "Virtual address of kernel base" if KERNEL_START_BOOL
739 default PAGE_OFFSET if PAGE_OFFSET_BOOL
740 default "0xc2000000" if CRASH_DUMP
743 config PHYSICAL_START_BOOL
744 bool "Set physical address where the kernel is loaded"
745 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
747 This gives the physical address where the kernel is loaded.
749 Say N here unless you know what you are doing.
751 config PHYSICAL_START
752 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
753 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
756 config PHYSICAL_ALIGN
758 default "0x10000000" if FSL_BOOKE
760 This value puts the alignment restrictions on physical address
761 where kernel is loaded and run from. Kernel is compiled for an
762 address which meets above alignment restriction.
764 config TASK_SIZE_BOOL
765 bool "Set custom user task size"
766 depends on ADVANCED_OPTIONS
768 This option allows you to set the amount of virtual address space
769 allocated to user tasks. This can be useful in optimizing the
770 virtual memory layout of the system.
772 Say N here unless you know what you are doing.
775 hex "Size of user task space" if TASK_SIZE_BOOL
776 default "0x80000000" if PPC_PREP || PPC_8xx
779 config CONSISTENT_START_BOOL
780 bool "Set custom consistent memory pool address"
781 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
783 This option allows you to set the base virtual address
784 of the consistent memory pool. This pool of virtual
785 memory is used to make consistent memory allocations.
787 config CONSISTENT_START
788 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
789 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
790 default "0xff100000" if NOT_COHERENT_CACHE
792 config CONSISTENT_SIZE_BOOL
793 bool "Set custom consistent memory pool size"
794 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
796 This option allows you to set the size of the
797 consistent memory pool. This pool of virtual memory
798 is used to make consistent memory allocations.
800 config CONSISTENT_SIZE
801 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
802 default "0x00200000" if NOT_COHERENT_CACHE
805 bool "Pinned Kernel TLBs (860 ONLY)"
806 depends on ADVANCED_OPTIONS && 8xx
812 default "0xc000000000000000"
815 default "0xc000000002000000" if CRASH_DUMP
816 default "0xc000000000000000"
817 config PHYSICAL_START
819 default "0x02000000" if CRASH_DUMP
825 source "drivers/Kconfig"
829 # XXX source "arch/ppc/8xx_io/Kconfig"
831 # XXX source "arch/ppc/8260_io/Kconfig"
833 source "arch/powerpc/sysdev/qe_lib/Kconfig"
837 source "arch/powerpc/Kconfig.debug"
839 source "security/Kconfig"
843 depends on COMPAT && KEYS
846 source "crypto/Kconfig"
856 source "arch/powerpc/kvm/Kconfig"