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_KRETPROBES
117 select HAVE_DMA_ATTRS if PPC64
127 select COMPAT_BINFMT_ELF
129 config SYSVIPC_COMPAT
131 depends on COMPAT && SYSVIPC
134 # All PPC32s use generic nvram driver through ppc_md
139 config SCHED_NO_NO_OMIT_FRAME_POINTER
143 config ARCH_MAY_HAVE_PC_FDC
145 default !PPC_PSERIES || PCI
153 config PPC_UDBG_16550
157 config GENERIC_TBSYNC
159 default y if PPC32 && SMP
171 config SYS_SUPPORTS_APM_EMULATION
172 default y if PMAC_APM_EMU
175 config DEFAULT_UIMAGE
178 Used to allow a board to specify it wants a uImage built by default
186 depends on (PPC_PMAC && !SMP) || BROKEN
191 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
194 config ARCH_HIBERNATION_POSSIBLE
196 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
199 config ARCH_SUSPEND_POSSIBLE
201 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
203 config PPC_DCR_NATIVE
213 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
216 config PPC_OF_PLATFORM_PCI
219 depends on PPC64 # not supported on 32 bits yet
222 source "init/Kconfig"
224 source "arch/powerpc/sysdev/Kconfig"
225 source "arch/powerpc/platforms/Kconfig"
227 menu "Kernel options"
230 bool "High memory support"
233 source kernel/time/Kconfig
234 source kernel/Kconfig.hz
235 source kernel/Kconfig.preempt
236 source "fs/Kconfig.binfmt"
238 config HUGETLB_PAGE_SIZE_VARIABLE
240 depends on HUGETLB_PAGE
243 config MATH_EMULATION
244 bool "Math emulation"
245 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
247 Some PowerPC chips designed for embedded applications do not have
248 a floating-point unit and therefore do not implement the
249 floating-point instructions in the PowerPC instruction set. If you
250 say Y here, the kernel will include code to emulate a floating-point
251 unit, which will allow programs that use floating-point
254 config 8XX_MINIMAL_FPEMU
255 bool "Minimal math emulation for 8xx"
256 depends on 8xx && !MATH_EMULATION
258 Older arch/ppc kernels still emulated a few floating point
259 instructions such as load and store, even when full math
260 emulation is disabled. Say "Y" here if you want to preserve
263 It is recommended that you build a soft-float userspace instead.
266 bool "Enable IOMMU virtual merging"
270 Cause IO segments sent to a device for DMA to be merged virtually
271 by the IOMMU when they happen to have been allocated contiguously.
272 This doesn't add pressure to the IOMMU allocator. However, some
273 drivers don't support getting large merged segments coming back
276 Most drivers don't have this problem; it is safe to say Y here.
282 bool "Support for enabling/disabling CPUs"
283 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
285 Say Y here to be able to disable and re-enable individual
286 CPUs at runtime on SMP machines.
288 Say N if you are unsure.
290 config ARCH_ENABLE_MEMORY_HOTPLUG
293 config ARCH_HAS_WALK_MEMORY
296 config ARCH_ENABLE_MEMORY_HOTREMOVE
300 bool "kexec system call (EXPERIMENTAL)"
301 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
303 kexec is a system call that implements the ability to shutdown your
304 current kernel, and to start another kernel. It is like a reboot
305 but it is independent of the system firmware. And like a reboot
306 you can start any kernel with it, not just Linux.
308 The name comes from the similarity to the exec system call.
310 It is an ongoing process to be certain the hardware in a machine
311 is properly shutdown, so do not be surprised if this code does not
312 initially work for you. It may help to enable device hotplugging
313 support. As of this writing the exact hardware interface is
314 strongly in flux, so no good recommendation can be made.
317 bool "Build a kdump crash kernel"
318 depends on PPC_MULTIPLATFORM && PPC64
320 Build a kernel suitable for use as a kdump capture kernel.
321 The kernel will be linked at a different address than normal, and
322 so can only be used for Kdump.
324 Don't change this unless you know what you are doing.
327 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
328 depends on PPC_PSERIES && EXPERIMENTAL
330 Hypervisor-assisted dump is meant to be a kdump replacement
331 offering robustness and speed not possible without system
332 hypervisor assistence.
337 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
338 default y if PPC_PREP
341 bool "Distribute interrupts on all CPUs by default"
342 depends on SMP && !MV64360
344 This option gives the kernel permission to distribute IRQs across
345 multiple CPUs. Saying N here will route all IRQs to the first
346 CPU. Generally saying Y is safe, although some problems have been
347 reported with SMP Power Macintoshes with this option enabled.
352 default y if SMP && PPC_PSERIES
357 depends on NEED_MULTIPLE_NODES
359 config ARCH_SELECT_MEMORY_MODEL
363 config ARCH_FLATMEM_ENABLE
365 depends on (PPC64 && !NUMA) || PPC32
367 config ARCH_SPARSEMEM_ENABLE
370 select SPARSEMEM_VMEMMAP_ENABLE
372 config ARCH_SPARSEMEM_DEFAULT
374 depends on (SMP && PPC_PSERIES) || PPC_PS3
376 config ARCH_POPULATES_NODE_MAP
381 config ARCH_MEMORY_PROBE
383 depends on MEMORY_HOTPLUG
385 # Some NUMA nodes have memory ranges that span
386 # other nodes. Even though a pfn is valid and
387 # between a node's start and end pfns, it may not
388 # reside on that node. See memmap_init_zone()
390 config NODES_SPAN_OTHER_NODES
392 depends on NEED_MULTIPLE_NODES
394 config PPC_HAS_HASH_64K
402 select PPC_HAS_HASH_64K
404 This option changes the kernel logical page size to 64k. On machines
405 without processor support for 64k pages, the kernel will simulate
406 them by loading each individual 4k page on demand transparently,
407 while on hardware with such support, it will be used to map
408 normal application pages.
410 config FORCE_MAX_ZONEORDER
411 int "Maximum zone order"
412 default "9" if PPC_64K_PAGES
413 default "13" if PPC64 && !PPC_64K_PAGES
416 The kernel memory allocator divides physically contiguous memory
417 blocks into "zones", where each zone is a power of two number of
418 pages. This option selects the largest power of two that the kernel
419 keeps in the memory allocator. If you need to allocate very large
420 blocks of physically contiguous memory, then you may need to
423 This config option is actually maximum order plus one. For example,
424 a value of 11 means that the largest free memory block is 2^10 pages.
426 The page size is not necessarily 4KB. For example, on 64-bit
427 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
428 this in mind when choosing a value for this option.
430 config PPC_SUBPAGE_PROT
431 bool "Support setting protections for 4k subpages"
432 depends on PPC_64K_PAGES
434 This option adds support for a system call to allow user programs
435 to set access permissions (read/write, readonly, or no access)
436 on the 4k subpages of each 64k page.
439 bool "SMT (Hyperthreading) scheduler support"
440 depends on PPC64 && SMP
442 SMT scheduler support improves the CPU scheduler's decision making
443 when dealing with POWER5 cpus at a cost of slightly increased
444 overhead in some places. If unsure say N here.
446 config PROC_DEVICETREE
447 bool "Support for device tree in /proc"
450 This option adds a device-tree directory under /proc which contains
451 an image of the device tree that the kernel copies from Open
452 Firmware or other boot firmware. If unsure, say Y here.
455 bool "Default bootloader kernel arguments"
458 string "Initial kernel command string"
459 depends on CMDLINE_BOOL
460 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
462 On some platforms, there is currently no way for the boot loader to
463 pass arguments to the kernel. For these platforms, you can supply
464 some command-line options at build time by entering them here. In
465 most cases you will need to specify the root device here.
468 string "Additional default image types"
470 List additional targets to be built by the bootwrapper here (separated
471 by spaces). This is useful for targets that depend of device tree
472 files in the .dts directory.
474 Targets in this list will be build as part of the default build
475 target, or when the user does a 'make zImage' or a
476 'make zImage.initrd'.
478 If unsure, leave blank
481 config ARCH_WANTS_FREEZER_CONTROL
485 source kernel/power/Kconfig
489 bool "Enable seccomp to safely compute untrusted bytecode"
493 This kernel feature is useful for number crunching applications
494 that may need to compute untrusted bytecode during their
495 execution. By using pipes or other transports made available to
496 the process as file descriptors supporting the read/write
497 syscalls, it's possible to isolate those applications in
498 their own address space using seccomp. Once seccomp is
499 enabled via /proc/<pid>/seccomp, it cannot be disabled
500 and the task is only allowed to execute a few safe syscalls
501 defined by each seccomp mode.
503 If unsure, say Y. Only embedded should say N here.
509 default !PPC_ISERIES || PCI
514 bool "Support for ISA-bus hardware"
515 depends on PPC_PREP || PPC_CHRP
518 Find out whether you have ISA slots on your motherboard. ISA is the
519 name of a bus system, i.e. the way the CPU talks to the other stuff
520 inside your box. If you have an Apple machine, say N here; if you
521 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
522 you have an embedded board, consult your board documentation.
528 config GENERIC_ISA_DMA
530 depends on PPC64 || POWER4 || 6xx && !CPM2
533 config PPC_INDIRECT_PCI
536 default y if 40x || 44x
550 select PPC_INDIRECT_PCI
558 Freescale Localbus support
562 depends on PPC_83xx || QUICC_ENGINE || CPM2
564 Freescale General-purpose Timers support
566 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
571 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
572 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
574 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
575 && !PPC_85xx && !PPC_86xx
576 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
577 default PCI_QSPAN if !4xx && !CPM2 && 8xx
578 select ARCH_SUPPORTS_MSI
580 Find out whether your system includes a PCI bus. PCI is the name of
581 a bus system, i.e. the way the CPU talks to the other stuff inside
582 your box. If you say Y here, the kernel will include drivers and
583 infrastructure code to support PCI bus devices.
593 depends on !4xx && !CPM2 && 8xx
596 Say Y here if you have a system based on a Motorola 8xx-series
597 embedded processor with a QSPAN PCI interface, otherwise say N.
601 depends on PCI && 8260
602 select PPC_INDIRECT_PCI
606 bool "Enable workaround for MPC826x erratum PCI 9"
607 depends on PCI_8260 && !8272
611 prompt "IDMA channel for PCI 9 workaround"
614 config 8260_PCI9_IDMA1
617 config 8260_PCI9_IDMA2
620 config 8260_PCI9_IDMA3
623 config 8260_PCI9_IDMA4
628 source "drivers/pci/pcie/Kconfig"
630 source "drivers/pci/Kconfig"
632 source "drivers/pcmcia/Kconfig"
634 source "drivers/pci/hotplug/Kconfig"
641 bool "RapidIO support"
642 depends on HAS_RAPIDIO
644 If you say Y here, the kernel will include drivers and
645 infrastructure code to support RapidIO interconnect devices.
647 source "drivers/rapidio/Kconfig"
651 menu "Advanced setup"
654 config ADVANCED_OPTIONS
655 bool "Prompt for advanced kernel configuration options"
657 This option will enable prompting for a variety of advanced kernel
658 configuration options. These options can cause the kernel to not
659 work if they are set incorrectly, but can be used to optimize certain
660 aspects of kernel memory management.
662 Unless you know what you are doing, say N here.
664 comment "Default settings for advanced configuration options are used"
665 depends on !ADVANCED_OPTIONS
667 config LOWMEM_SIZE_BOOL
668 bool "Set maximum low memory"
669 depends on ADVANCED_OPTIONS
671 This option allows you to set the maximum amount of memory which
672 will be used as "low memory", that is, memory which the kernel can
673 access directly, without having to set up a kernel virtual mapping.
674 This can be useful in optimizing the layout of kernel virtual
677 Say N here unless you know what you are doing.
680 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
684 bool "Build a relocatable kernel (EXPERIMENTAL)"
685 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
687 This builds a kernel image that is capable of running at the
688 location the kernel is loaded at (some alignment restrictions may
691 One use is for the kexec on panic case where the recovery kernel
692 must live at a different physical address than the primary
695 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
696 it has been loaded at and the compile time physical addresses
697 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
698 setting can still be useful to bootwrappers that need to know the
699 load location of the kernel (eg. u-boot/mkimage).
701 config PAGE_OFFSET_BOOL
702 bool "Set custom page offset address"
703 depends on ADVANCED_OPTIONS
705 This option allows you to set the kernel virtual address at which
706 the kernel will map low memory. This can be useful in optimizing
707 the virtual memory layout of the system.
709 Say N here unless you know what you are doing.
712 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
715 config KERNEL_START_BOOL
716 bool "Set custom kernel base address"
717 depends on ADVANCED_OPTIONS
719 This option allows you to set the kernel virtual address at which
720 the kernel will be loaded. Normally this should match PAGE_OFFSET
721 however there are times (like kdump) that one might not want them
724 Say N here unless you know what you are doing.
727 hex "Virtual address of kernel base" if KERNEL_START_BOOL
728 default PAGE_OFFSET if PAGE_OFFSET_BOOL
729 default "0xc2000000" if CRASH_DUMP
732 config PHYSICAL_START_BOOL
733 bool "Set physical address where the kernel is loaded"
734 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
736 This gives the physical address where the kernel is loaded.
738 Say N here unless you know what you are doing.
740 config PHYSICAL_START
741 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
742 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
745 config PHYSICAL_ALIGN
747 default "0x10000000" if FSL_BOOKE
749 This value puts the alignment restrictions on physical address
750 where kernel is loaded and run from. Kernel is compiled for an
751 address which meets above alignment restriction.
753 config TASK_SIZE_BOOL
754 bool "Set custom user task size"
755 depends on ADVANCED_OPTIONS
757 This option allows you to set the amount of virtual address space
758 allocated to user tasks. This can be useful in optimizing the
759 virtual memory layout of the system.
761 Say N here unless you know what you are doing.
764 hex "Size of user task space" if TASK_SIZE_BOOL
765 default "0x80000000" if PPC_PREP || PPC_8xx
768 config CONSISTENT_START_BOOL
769 bool "Set custom consistent memory pool address"
770 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
772 This option allows you to set the base virtual address
773 of the consistent memory pool. This pool of virtual
774 memory is used to make consistent memory allocations.
776 config CONSISTENT_START
777 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
778 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
779 default "0xff100000" if NOT_COHERENT_CACHE
781 config CONSISTENT_SIZE_BOOL
782 bool "Set custom consistent memory pool size"
783 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
785 This option allows you to set the size of the
786 consistent memory pool. This pool of virtual memory
787 is used to make consistent memory allocations.
789 config CONSISTENT_SIZE
790 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
791 default "0x00200000" if NOT_COHERENT_CACHE
794 bool "Pinned Kernel TLBs (860 ONLY)"
795 depends on ADVANCED_OPTIONS && 8xx
801 default "0xc000000000000000"
804 default "0xc000000002000000" if CRASH_DUMP
805 default "0xc000000000000000"
806 config PHYSICAL_START
808 default "0x02000000" if CRASH_DUMP
814 source "drivers/Kconfig"
818 # XXX source "arch/ppc/8xx_io/Kconfig"
820 # XXX source "arch/ppc/8260_io/Kconfig"
822 source "arch/powerpc/sysdev/qe_lib/Kconfig"
826 source "arch/powerpc/Kconfig.debug"
828 source "security/Kconfig"
832 depends on COMPAT && KEYS
835 source "crypto/Kconfig"
844 source "arch/powerpc/kvm/Kconfig"