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
108 select HAVE_DYNAMIC_FTRACE
112 select HAVE_KRETPROBES
114 select USE_GENERIC_SMP_HELPERS if SMP
124 select COMPAT_BINFMT_ELF
126 config SYSVIPC_COMPAT
128 depends on COMPAT && SYSVIPC
131 # All PPC32s use generic nvram driver through ppc_md
136 config SCHED_NO_NO_OMIT_FRAME_POINTER
140 config ARCH_MAY_HAVE_PC_FDC
142 default !PPC_PSERIES || PCI
150 config PPC_UDBG_16550
154 config GENERIC_TBSYNC
156 default y if PPC32 && SMP
168 config SYS_SUPPORTS_APM_EMULATION
169 default y if PMAC_APM_EMU
172 config DEFAULT_UIMAGE
175 Used to allow a board to specify it wants a uImage built by default
183 depends on (PPC_PMAC && !SMP) || BROKEN
188 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
191 config ARCH_HIBERNATION_POSSIBLE
193 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
196 config ARCH_SUSPEND_POSSIBLE
198 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
200 config PPC_DCR_NATIVE
210 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
213 config PPC_OF_PLATFORM_PCI
216 depends on PPC64 # not supported on 32 bits yet
219 source "init/Kconfig"
221 source "arch/powerpc/sysdev/Kconfig"
222 source "arch/powerpc/platforms/Kconfig"
224 menu "Kernel options"
227 bool "High memory support"
230 source kernel/time/Kconfig
231 source kernel/Kconfig.hz
232 source kernel/Kconfig.preempt
233 source "fs/Kconfig.binfmt"
235 config HUGETLB_PAGE_SIZE_VARIABLE
237 depends on HUGETLB_PAGE
240 config MATH_EMULATION
241 bool "Math emulation"
242 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
244 Some PowerPC chips designed for embedded applications do not have
245 a floating-point unit and therefore do not implement the
246 floating-point instructions in the PowerPC instruction set. If you
247 say Y here, the kernel will include code to emulate a floating-point
248 unit, which will allow programs that use floating-point
251 config 8XX_MINIMAL_FPEMU
252 bool "Minimal math emulation for 8xx"
253 depends on 8xx && !MATH_EMULATION
255 Older arch/ppc kernels still emulated a few floating point
256 instructions such as load and store, even when full math
257 emulation is disabled. Say "Y" here if you want to preserve
260 It is recommended that you build a soft-float userspace instead.
263 bool "Enable IOMMU virtual merging"
267 Cause IO segments sent to a device for DMA to be merged virtually
268 by the IOMMU when they happen to have been allocated contiguously.
269 This doesn't add pressure to the IOMMU allocator. However, some
270 drivers don't support getting large merged segments coming back
273 Most drivers don't have this problem; it is safe to say Y here.
279 bool "Support for enabling/disabling CPUs"
280 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
282 Say Y here to be able to disable and re-enable individual
283 CPUs at runtime on SMP machines.
285 Say N if you are unsure.
287 config ARCH_ENABLE_MEMORY_HOTPLUG
290 config ARCH_HAS_WALK_MEMORY
293 config ARCH_ENABLE_MEMORY_HOTREMOVE
297 bool "kexec system call (EXPERIMENTAL)"
298 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
300 kexec is a system call that implements the ability to shutdown your
301 current kernel, and to start another kernel. It is like a reboot
302 but it is independent of the system firmware. And like a reboot
303 you can start any kernel with it, not just Linux.
305 The name comes from the similarity to the exec system call.
307 It is an ongoing process to be certain the hardware in a machine
308 is properly shutdown, so do not be surprised if this code does not
309 initially work for you. It may help to enable device hotplugging
310 support. As of this writing the exact hardware interface is
311 strongly in flux, so no good recommendation can be made.
314 bool "Build a kdump crash kernel (EXPERIMENTAL)"
315 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
317 Build a kernel suitable for use as a kdump capture kernel.
318 The kernel will be linked at a different address than normal, and
319 so can only be used for Kdump.
321 Don't change this unless you know what you are doing.
324 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
325 depends on PPC_PSERIES && EXPERIMENTAL
327 Hypervisor-assisted dump is meant to be a kdump replacement
328 offering robustness and speed not possible without system
329 hypervisor assistence.
334 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
335 default y if PPC_PREP
338 bool "Distribute interrupts on all CPUs by default"
339 depends on SMP && !MV64360
341 This option gives the kernel permission to distribute IRQs across
342 multiple CPUs. Saying N here will route all IRQs to the first
343 CPU. Generally saying Y is safe, although some problems have been
344 reported with SMP Power Macintoshes with this option enabled.
349 default y if SMP && PPC_PSERIES
354 depends on NEED_MULTIPLE_NODES
356 config ARCH_SELECT_MEMORY_MODEL
360 config ARCH_FLATMEM_ENABLE
362 depends on (PPC64 && !NUMA) || PPC32
364 config ARCH_SPARSEMEM_ENABLE
367 select SPARSEMEM_VMEMMAP_ENABLE
369 config ARCH_SPARSEMEM_DEFAULT
371 depends on (SMP && PPC_PSERIES) || PPC_PS3
373 config ARCH_POPULATES_NODE_MAP
378 config ARCH_MEMORY_PROBE
380 depends on MEMORY_HOTPLUG
382 # Some NUMA nodes have memory ranges that span
383 # other nodes. Even though a pfn is valid and
384 # between a node's start and end pfns, it may not
385 # reside on that node. See memmap_init_zone()
387 config NODES_SPAN_OTHER_NODES
389 depends on NEED_MULTIPLE_NODES
391 config PPC_HAS_HASH_64K
399 select PPC_HAS_HASH_64K
401 This option changes the kernel logical page size to 64k. On machines
402 without processor support for 64k pages, the kernel will simulate
403 them by loading each individual 4k page on demand transparently,
404 while on hardware with such support, it will be used to map
405 normal application pages.
407 config FORCE_MAX_ZONEORDER
408 int "Maximum zone order"
409 default "9" if PPC_64K_PAGES
410 default "13" if PPC64 && !PPC_64K_PAGES
413 The kernel memory allocator divides physically contiguous memory
414 blocks into "zones", where each zone is a power of two number of
415 pages. This option selects the largest power of two that the kernel
416 keeps in the memory allocator. If you need to allocate very large
417 blocks of physically contiguous memory, then you may need to
420 This config option is actually maximum order plus one. For example,
421 a value of 11 means that the largest free memory block is 2^10 pages.
423 The page size is not necessarily 4KB. For example, on 64-bit
424 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
425 this in mind when choosing a value for this option.
427 config PPC_SUBPAGE_PROT
428 bool "Support setting protections for 4k subpages"
429 depends on PPC_64K_PAGES
431 This option adds support for a system call to allow user programs
432 to set access permissions (read/write, readonly, or no access)
433 on the 4k subpages of each 64k page.
436 bool "SMT (Hyperthreading) scheduler support"
437 depends on PPC64 && SMP
439 SMT scheduler support improves the CPU scheduler's decision making
440 when dealing with POWER5 cpus at a cost of slightly increased
441 overhead in some places. If unsure say N here.
443 config PROC_DEVICETREE
444 bool "Support for device tree in /proc"
447 This option adds a device-tree directory under /proc which contains
448 an image of the device tree that the kernel copies from Open
449 Firmware or other boot firmware. If unsure, say Y here.
452 bool "Default bootloader kernel arguments"
455 string "Initial kernel command string"
456 depends on CMDLINE_BOOL
457 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
459 On some platforms, there is currently no way for the boot loader to
460 pass arguments to the kernel. For these platforms, you can supply
461 some command-line options at build time by entering them here. In
462 most cases you will need to specify the root device here.
465 config ARCH_WANTS_FREEZER_CONTROL
469 source kernel/power/Kconfig
473 bool "Enable seccomp to safely compute untrusted bytecode"
477 This kernel feature is useful for number crunching applications
478 that may need to compute untrusted bytecode during their
479 execution. By using pipes or other transports made available to
480 the process as file descriptors supporting the read/write
481 syscalls, it's possible to isolate those applications in
482 their own address space using seccomp. Once seccomp is
483 enabled via /proc/<pid>/seccomp, it cannot be disabled
484 and the task is only allowed to execute a few safe syscalls
485 defined by each seccomp mode.
487 If unsure, say Y. Only embedded should say N here.
493 default !PPC_ISERIES || PCI
498 bool "Support for ISA-bus hardware"
499 depends on PPC_PREP || PPC_CHRP
502 Find out whether you have ISA slots on your motherboard. ISA is the
503 name of a bus system, i.e. the way the CPU talks to the other stuff
504 inside your box. If you have an Apple machine, say N here; if you
505 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
506 you have an embedded board, consult your board documentation.
512 config GENERIC_ISA_DMA
514 depends on PPC64 || POWER4 || 6xx && !CPM2
517 config PPC_INDIRECT_PCI
520 default y if 40x || 44x
534 select PPC_INDIRECT_PCI
542 Freescale Localbus support
544 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
549 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
550 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
552 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
553 && !PPC_85xx && !PPC_86xx
554 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
555 default PCI_QSPAN if !4xx && !CPM2 && 8xx
556 select ARCH_SUPPORTS_MSI
558 Find out whether your system includes a PCI bus. PCI is the name of
559 a bus system, i.e. the way the CPU talks to the other stuff inside
560 your box. If you say Y here, the kernel will include drivers and
561 infrastructure code to support PCI bus devices.
571 depends on !4xx && !CPM2 && 8xx
574 Say Y here if you have a system based on a Motorola 8xx-series
575 embedded processor with a QSPAN PCI interface, otherwise say N.
579 depends on PCI && 8260
580 select PPC_INDIRECT_PCI
584 bool "Enable workaround for MPC826x erratum PCI 9"
585 depends on PCI_8260 && !8272
589 prompt "IDMA channel for PCI 9 workaround"
592 config 8260_PCI9_IDMA1
595 config 8260_PCI9_IDMA2
598 config 8260_PCI9_IDMA3
601 config 8260_PCI9_IDMA4
606 source "drivers/pci/pcie/Kconfig"
608 source "drivers/pci/Kconfig"
610 source "drivers/pcmcia/Kconfig"
612 source "drivers/pci/hotplug/Kconfig"
619 bool "RapidIO support"
620 depends on HAS_RAPIDIO
622 If you say Y here, the kernel will include drivers and
623 infrastructure code to support RapidIO interconnect devices.
625 source "drivers/rapidio/Kconfig"
629 menu "Advanced setup"
632 config ADVANCED_OPTIONS
633 bool "Prompt for advanced kernel configuration options"
635 This option will enable prompting for a variety of advanced kernel
636 configuration options. These options can cause the kernel to not
637 work if they are set incorrectly, but can be used to optimize certain
638 aspects of kernel memory management.
640 Unless you know what you are doing, say N here.
642 comment "Default settings for advanced configuration options are used"
643 depends on !ADVANCED_OPTIONS
645 config LOWMEM_SIZE_BOOL
646 bool "Set maximum low memory"
647 depends on ADVANCED_OPTIONS
649 This option allows you to set the maximum amount of memory which
650 will be used as "low memory", that is, memory which the kernel can
651 access directly, without having to set up a kernel virtual mapping.
652 This can be useful in optimizing the layout of kernel virtual
655 Say N here unless you know what you are doing.
658 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
662 bool "Build a relocatable kernel (EXPERIMENTAL)"
663 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
665 This builds a kernel image that is capable of running at the
666 location the kernel is loaded at (some alignment restrictions may
669 One use is for the kexec on panic case where the recovery kernel
670 must live at a different physical address than the primary
673 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
674 it has been loaded at and the compile time physical addresses
675 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
676 setting can still be useful to bootwrappers that need to know the
677 load location of the kernel (eg. u-boot/mkimage).
679 config PAGE_OFFSET_BOOL
680 bool "Set custom page offset address"
681 depends on ADVANCED_OPTIONS
683 This option allows you to set the kernel virtual address at which
684 the kernel will map low memory. This can be useful in optimizing
685 the virtual memory layout of the system.
687 Say N here unless you know what you are doing.
690 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
693 config KERNEL_START_BOOL
694 bool "Set custom kernel base address"
695 depends on ADVANCED_OPTIONS
697 This option allows you to set the kernel virtual address at which
698 the kernel will be loaded. Normally this should match PAGE_OFFSET
699 however there are times (like kdump) that one might not want them
702 Say N here unless you know what you are doing.
705 hex "Virtual address of kernel base" if KERNEL_START_BOOL
706 default PAGE_OFFSET if PAGE_OFFSET_BOOL
707 default "0xc2000000" if CRASH_DUMP
710 config PHYSICAL_START_BOOL
711 bool "Set physical address where the kernel is loaded"
712 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
714 This gives the physical address where the kernel is loaded.
716 Say N here unless you know what you are doing.
718 config PHYSICAL_START
719 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
720 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
723 config PHYSICAL_ALIGN
725 default "0x10000000" if FSL_BOOKE
727 This value puts the alignment restrictions on physical address
728 where kernel is loaded and run from. Kernel is compiled for an
729 address which meets above alignment restriction.
731 config TASK_SIZE_BOOL
732 bool "Set custom user task size"
733 depends on ADVANCED_OPTIONS
735 This option allows you to set the amount of virtual address space
736 allocated to user tasks. This can be useful in optimizing the
737 virtual memory layout of the system.
739 Say N here unless you know what you are doing.
742 hex "Size of user task space" if TASK_SIZE_BOOL
743 default "0x80000000" if PPC_PREP || PPC_8xx
746 config CONSISTENT_START_BOOL
747 bool "Set custom consistent memory pool address"
748 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
750 This option allows you to set the base virtual address
751 of the consistent memory pool. This pool of virtual
752 memory is used to make consistent memory allocations.
754 config CONSISTENT_START
755 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
756 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
757 default "0xff100000" if NOT_COHERENT_CACHE
759 config CONSISTENT_SIZE_BOOL
760 bool "Set custom consistent memory pool size"
761 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
763 This option allows you to set the size of the
764 consistent memory pool. This pool of virtual memory
765 is used to make consistent memory allocations.
767 config CONSISTENT_SIZE
768 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
769 default "0x00200000" if NOT_COHERENT_CACHE
772 bool "Pinned Kernel TLBs (860 ONLY)"
773 depends on ADVANCED_OPTIONS && 8xx
779 default "0xc000000000000000"
782 default "0xc000000002000000" if CRASH_DUMP
783 default "0xc000000000000000"
784 config PHYSICAL_START
786 default "0x02000000" if CRASH_DUMP
792 source "drivers/Kconfig"
796 # XXX source "arch/ppc/8xx_io/Kconfig"
798 # XXX source "arch/ppc/8260_io/Kconfig"
800 source "arch/powerpc/sysdev/qe_lib/Kconfig"
804 source "arch/powerpc/Kconfig.debug"
806 source "security/Kconfig"
810 depends on COMPAT && KEYS
813 source "crypto/Kconfig"
822 source "arch/powerpc/kvm/Kconfig"