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
111 select HAVE_KRETPROBES
121 select COMPAT_BINFMT_ELF
123 config SYSVIPC_COMPAT
125 depends on COMPAT && SYSVIPC
128 # All PPC32s use generic nvram driver through ppc_md
133 config SCHED_NO_NO_OMIT_FRAME_POINTER
137 config ARCH_MAY_HAVE_PC_FDC
139 default !PPC_PSERIES || PCI
147 config PPC_UDBG_16550
151 config GENERIC_TBSYNC
153 default y if PPC32 && SMP
165 config SYS_SUPPORTS_APM_EMULATION
166 default y if PMAC_APM_EMU
169 config DEFAULT_UIMAGE
172 Used to allow a board to specify it wants a uImage built by default
180 depends on (PPC_PMAC && !SMP) || BROKEN
185 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
188 config ARCH_HIBERNATION_POSSIBLE
190 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
193 config ARCH_SUSPEND_POSSIBLE
195 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
197 config PPC_DCR_NATIVE
207 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
210 config PPC_OF_PLATFORM_PCI
213 depends on PPC64 # not supported on 32 bits yet
216 source "init/Kconfig"
218 source "arch/powerpc/sysdev/Kconfig"
219 source "arch/powerpc/platforms/Kconfig"
221 menu "Kernel options"
224 bool "High memory support"
227 source kernel/time/Kconfig
228 source kernel/Kconfig.hz
229 source kernel/Kconfig.preempt
230 source "fs/Kconfig.binfmt"
232 config HUGETLB_PAGE_SIZE_VARIABLE
234 depends on HUGETLB_PAGE
237 config MATH_EMULATION
238 bool "Math emulation"
239 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
241 Some PowerPC chips designed for embedded applications do not have
242 a floating-point unit and therefore do not implement the
243 floating-point instructions in the PowerPC instruction set. If you
244 say Y here, the kernel will include code to emulate a floating-point
245 unit, which will allow programs that use floating-point
248 config 8XX_MINIMAL_FPEMU
249 bool "Minimal math emulation for 8xx"
250 depends on 8xx && !MATH_EMULATION
252 Older arch/ppc kernels still emulated a few floating point
253 instructions such as load and store, even when full math
254 emulation is disabled. Say "Y" here if you want to preserve
257 It is recommended that you build a soft-float userspace instead.
260 bool "Enable IOMMU virtual merging"
264 Cause IO segments sent to a device for DMA to be merged virtually
265 by the IOMMU when they happen to have been allocated contiguously.
266 This doesn't add pressure to the IOMMU allocator. However, some
267 drivers don't support getting large merged segments coming back
270 Most drivers don't have this problem; it is safe to say Y here.
276 bool "Support for enabling/disabling CPUs"
277 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
279 Say Y here to be able to disable and re-enable individual
280 CPUs at runtime on SMP machines.
282 Say N if you are unsure.
284 config ARCH_ENABLE_MEMORY_HOTPLUG
287 config ARCH_HAS_WALK_MEMORY
290 config ARCH_ENABLE_MEMORY_HOTREMOVE
294 bool "kexec system call (EXPERIMENTAL)"
295 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
297 kexec is a system call that implements the ability to shutdown your
298 current kernel, and to start another kernel. It is like a reboot
299 but it is independent of the system firmware. And like a reboot
300 you can start any kernel with it, not just Linux.
302 The name comes from the similarity to the exec system call.
304 It is an ongoing process to be certain the hardware in a machine
305 is properly shutdown, so do not be surprised if this code does not
306 initially work for you. It may help to enable device hotplugging
307 support. As of this writing the exact hardware interface is
308 strongly in flux, so no good recommendation can be made.
311 bool "Build a kdump crash kernel (EXPERIMENTAL)"
312 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
314 Build a kernel suitable for use as a kdump capture kernel.
315 The kernel will be linked at a different address than normal, and
316 so can only be used for Kdump.
318 Don't change this unless you know what you are doing.
321 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
322 depends on PPC_PSERIES && EXPERIMENTAL
324 Hypervisor-assisted dump is meant to be a kdump replacement
325 offering robustness and speed not possible without system
326 hypervisor assistence.
331 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
332 default y if PPC_PREP
335 bool "Distribute interrupts on all CPUs by default"
336 depends on SMP && !MV64360
338 This option gives the kernel permission to distribute IRQs across
339 multiple CPUs. Saying N here will route all IRQs to the first
340 CPU. Generally saying Y is safe, although some problems have been
341 reported with SMP Power Macintoshes with this option enabled.
346 default y if SMP && PPC_PSERIES
351 depends on NEED_MULTIPLE_NODES
353 config ARCH_SELECT_MEMORY_MODEL
357 config ARCH_FLATMEM_ENABLE
359 depends on (PPC64 && !NUMA) || PPC32
361 config ARCH_SPARSEMEM_ENABLE
364 select SPARSEMEM_VMEMMAP_ENABLE
366 config ARCH_SPARSEMEM_DEFAULT
368 depends on (SMP && PPC_PSERIES) || PPC_PS3
370 config ARCH_POPULATES_NODE_MAP
375 config ARCH_MEMORY_PROBE
377 depends on MEMORY_HOTPLUG
379 # Some NUMA nodes have memory ranges that span
380 # other nodes. Even though a pfn is valid and
381 # between a node's start and end pfns, it may not
382 # reside on that node. See memmap_init_zone()
384 config NODES_SPAN_OTHER_NODES
386 depends on NEED_MULTIPLE_NODES
388 config PPC_HAS_HASH_64K
396 select PPC_HAS_HASH_64K
398 This option changes the kernel logical page size to 64k. On machines
399 without processor support for 64k pages, the kernel will simulate
400 them by loading each individual 4k page on demand transparently,
401 while on hardware with such support, it will be used to map
402 normal application pages.
404 config FORCE_MAX_ZONEORDER
405 int "Maximum zone order"
406 default "9" if PPC_64K_PAGES
407 default "13" if PPC64 && !PPC_64K_PAGES
410 The kernel memory allocator divides physically contiguous memory
411 blocks into "zones", where each zone is a power of two number of
412 pages. This option selects the largest power of two that the kernel
413 keeps in the memory allocator. If you need to allocate very large
414 blocks of physically contiguous memory, then you may need to
417 This config option is actually maximum order plus one. For example,
418 a value of 11 means that the largest free memory block is 2^10 pages.
420 The page size is not necessarily 4KB. For example, on 64-bit
421 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
422 this in mind when choosing a value for this option.
424 config PPC_SUBPAGE_PROT
425 bool "Support setting protections for 4k subpages"
426 depends on PPC_64K_PAGES
428 This option adds support for a system call to allow user programs
429 to set access permissions (read/write, readonly, or no access)
430 on the 4k subpages of each 64k page.
433 bool "SMT (Hyperthreading) scheduler support"
434 depends on PPC64 && SMP
436 SMT scheduler support improves the CPU scheduler's decision making
437 when dealing with POWER5 cpus at a cost of slightly increased
438 overhead in some places. If unsure say N here.
440 config PROC_DEVICETREE
441 bool "Support for device tree in /proc"
444 This option adds a device-tree directory under /proc which contains
445 an image of the device tree that the kernel copies from Open
446 Firmware or other boot firmware. If unsure, say Y here.
449 bool "Default bootloader kernel arguments"
452 string "Initial kernel command string"
453 depends on CMDLINE_BOOL
454 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
456 On some platforms, there is currently no way for the boot loader to
457 pass arguments to the kernel. For these platforms, you can supply
458 some command-line options at build time by entering them here. In
459 most cases you will need to specify the root device here.
462 config ARCH_WANTS_FREEZER_CONTROL
466 source kernel/power/Kconfig
470 bool "Enable seccomp to safely compute untrusted bytecode"
474 This kernel feature is useful for number crunching applications
475 that may need to compute untrusted bytecode during their
476 execution. By using pipes or other transports made available to
477 the process as file descriptors supporting the read/write
478 syscalls, it's possible to isolate those applications in
479 their own address space using seccomp. Once seccomp is
480 enabled via /proc/<pid>/seccomp, it cannot be disabled
481 and the task is only allowed to execute a few safe syscalls
482 defined by each seccomp mode.
484 If unsure, say Y. Only embedded should say N here.
486 config WANT_DEVICE_TREE
490 config BUILD_RAW_IMAGE
491 bool "Build firmware-independent image"
492 select WANT_DEVICE_TREE
494 If this is enabled, a firmware independent "raw" image will be
495 built, as zImage.raw. This requires a completely filled-in
496 device tree, with the following labels:
498 mem_size_cells: on /#address-cells
499 memsize: on the size portion of /memory/reg
500 timebase: on the boot CPU's timebase property
503 string "Static device tree source file"
504 depends on WANT_DEVICE_TREE
506 This specifies the device tree source (.dts) file to be
507 compiled and included when building the bootwrapper. If a
508 relative filename is given, then it will be relative to
509 arch/powerpc/boot/dts. If you are not using the bootwrapper,
510 or do not need to build a dts into the bootwrapper, this
513 For example, this is required when building a cuImage target
514 for an older U-Boot, which cannot pass a device tree itself.
515 Such a kernel will not work with a newer U-Boot that tries to
516 pass a device tree (unless you tell it not to). If your U-Boot
517 does not mention a device tree in "help bootm", then use the
518 cuImage target and specify a device tree here. Otherwise, use
519 the uImage target and leave this field blank.
521 config COMPRESSED_DEVICE_TREE
522 bool "Use compressed device tree"
523 depends on XILINX_VIRTEX
524 depends on WANT_DEVICE_TREE
526 In Xilinx FPGAs, the hardware can change quite dramatically while
527 still running the same kernel. In this case and other similar
528 ones, it is preferable to associate the device tree with a
529 particular build of the hardware design. This configuration
530 option assumes that the device tree blob has been compressed and
531 stored in Block RAM in the FPGA design. Typically, such a block
532 ram is available in order to provide a bootloop or other code
533 close to the reset vector at the top of the address space. By
534 default, the parameter options associated with this configuration
535 assumes that exactly one block ram (2KB) of storage is available,
536 which should be sufficient for most designs. If necessary in a
537 particular design, due to boot code requirement or a large number
538 of devices, this address (and the corresponding parameters in the
539 EDK design) must be modified.
541 Note that in some highly area constrained designs, no block rams
542 may be available in the design, and some other mechanism may be
543 used to hold the processor in reset while external memory is
544 initialized with processor code. In such cases, that mechanism
545 should also be used to load the device tree at an appropriate
546 location, and the parameters associated with this configuration
547 option should be modified to point to that location in external
550 config COMPRESSED_DTB_START
551 hex "Start of compressed device tree"
552 depends on COMPRESSED_DEVICE_TREE
555 config COMPRESSED_DTB_SIZE
556 hex "Size of compressed device tree"
557 depends on COMPRESSED_DEVICE_TREE
564 default !PPC_ISERIES || PCI
569 bool "Support for ISA-bus hardware"
570 depends on PPC_PREP || PPC_CHRP
573 Find out whether you have ISA slots on your motherboard. ISA is the
574 name of a bus system, i.e. the way the CPU talks to the other stuff
575 inside your box. If you have an Apple machine, say N here; if you
576 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
577 you have an embedded board, consult your board documentation.
583 config GENERIC_ISA_DMA
585 depends on PPC64 || POWER4 || 6xx && !CPM2
588 config PPC_INDIRECT_PCI
591 default y if 40x || 44x
605 select PPC_INDIRECT_PCI
613 Freescale Localbus support
615 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
620 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
621 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
623 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
624 && !PPC_85xx && !PPC_86xx
625 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
626 default PCI_QSPAN if !4xx && !CPM2 && 8xx
627 select ARCH_SUPPORTS_MSI
629 Find out whether your system includes a PCI bus. PCI is the name of
630 a bus system, i.e. the way the CPU talks to the other stuff inside
631 your box. If you say Y here, the kernel will include drivers and
632 infrastructure code to support PCI bus devices.
642 depends on !4xx && !CPM2 && 8xx
645 Say Y here if you have a system based on a Motorola 8xx-series
646 embedded processor with a QSPAN PCI interface, otherwise say N.
650 depends on PCI && 8260
651 select PPC_INDIRECT_PCI
655 bool "Enable workaround for MPC826x erratum PCI 9"
656 depends on PCI_8260 && !8272
660 prompt "IDMA channel for PCI 9 workaround"
663 config 8260_PCI9_IDMA1
666 config 8260_PCI9_IDMA2
669 config 8260_PCI9_IDMA3
672 config 8260_PCI9_IDMA4
677 source "drivers/pci/pcie/Kconfig"
679 source "drivers/pci/Kconfig"
681 source "drivers/pcmcia/Kconfig"
683 source "drivers/pci/hotplug/Kconfig"
690 bool "RapidIO support"
691 depends on HAS_RAPIDIO
693 If you say Y here, the kernel will include drivers and
694 infrastructure code to support RapidIO interconnect devices.
696 source "drivers/rapidio/Kconfig"
700 menu "Advanced setup"
703 config ADVANCED_OPTIONS
704 bool "Prompt for advanced kernel configuration options"
706 This option will enable prompting for a variety of advanced kernel
707 configuration options. These options can cause the kernel to not
708 work if they are set incorrectly, but can be used to optimize certain
709 aspects of kernel memory management.
711 Unless you know what you are doing, say N here.
713 comment "Default settings for advanced configuration options are used"
714 depends on !ADVANCED_OPTIONS
716 config LOWMEM_SIZE_BOOL
717 bool "Set maximum low memory"
718 depends on ADVANCED_OPTIONS
720 This option allows you to set the maximum amount of memory which
721 will be used as "low memory", that is, memory which the kernel can
722 access directly, without having to set up a kernel virtual mapping.
723 This can be useful in optimizing the layout of kernel virtual
726 Say N here unless you know what you are doing.
729 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
733 bool "Build a relocatable kernel (EXPERIMENTAL)"
734 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
736 This builds a kernel image that is capable of running at the
737 location the kernel is loaded at (some alignment restrictions may
740 One use is for the kexec on panic case where the recovery kernel
741 must live at a different physical address than the primary
744 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
745 it has been loaded at and the compile time physical addresses
746 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
747 setting can still be useful to bootwrappers that need to know the
748 load location of the kernel (eg. u-boot/mkimage).
750 config PAGE_OFFSET_BOOL
751 bool "Set custom page offset address"
752 depends on ADVANCED_OPTIONS
754 This option allows you to set the kernel virtual address at which
755 the kernel will map low memory. This can be useful in optimizing
756 the virtual memory layout of the system.
758 Say N here unless you know what you are doing.
761 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
764 config KERNEL_START_BOOL
765 bool "Set custom kernel base address"
766 depends on ADVANCED_OPTIONS
768 This option allows you to set the kernel virtual address at which
769 the kernel will be loaded. Normally this should match PAGE_OFFSET
770 however there are times (like kdump) that one might not want them
773 Say N here unless you know what you are doing.
776 hex "Virtual address of kernel base" if KERNEL_START_BOOL
777 default PAGE_OFFSET if PAGE_OFFSET_BOOL
778 default "0xc2000000" if CRASH_DUMP
781 config PHYSICAL_START_BOOL
782 bool "Set physical address where the kernel is loaded"
783 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
785 This gives the physical address where the kernel is loaded.
787 Say N here unless you know what you are doing.
789 config PHYSICAL_START
790 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
791 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
794 config PHYSICAL_ALIGN
796 default "0x10000000" if FSL_BOOKE
798 This value puts the alignment restrictions on physical address
799 where kernel is loaded and run from. Kernel is compiled for an
800 address which meets above alignment restriction.
802 config TASK_SIZE_BOOL
803 bool "Set custom user task size"
804 depends on ADVANCED_OPTIONS
806 This option allows you to set the amount of virtual address space
807 allocated to user tasks. This can be useful in optimizing the
808 virtual memory layout of the system.
810 Say N here unless you know what you are doing.
813 hex "Size of user task space" if TASK_SIZE_BOOL
814 default "0x80000000" if PPC_PREP || PPC_8xx
817 config CONSISTENT_START_BOOL
818 bool "Set custom consistent memory pool address"
819 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
821 This option allows you to set the base virtual address
822 of the consistent memory pool. This pool of virtual
823 memory is used to make consistent memory allocations.
825 config CONSISTENT_START
826 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
827 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
828 default "0xff100000" if NOT_COHERENT_CACHE
830 config CONSISTENT_SIZE_BOOL
831 bool "Set custom consistent memory pool size"
832 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
834 This option allows you to set the size of the
835 consistent memory pool. This pool of virtual memory
836 is used to make consistent memory allocations.
838 config CONSISTENT_SIZE
839 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
840 default "0x00200000" if NOT_COHERENT_CACHE
843 bool "Pinned Kernel TLBs (860 ONLY)"
844 depends on ADVANCED_OPTIONS && 8xx
850 default "0xc000000000000000"
853 default "0xc000000002000000" if CRASH_DUMP
854 default "0xc000000000000000"
855 config PHYSICAL_START
857 default "0x02000000" if CRASH_DUMP
863 source "drivers/Kconfig"
867 # XXX source "arch/ppc/8xx_io/Kconfig"
869 # XXX source "arch/ppc/8260_io/Kconfig"
871 source "arch/powerpc/sysdev/qe_lib/Kconfig"
875 source "arch/powerpc/Kconfig.debug"
877 source "security/Kconfig"
881 depends on COMPAT && KEYS
884 source "crypto/Kconfig"
893 source "arch/powerpc/kvm/Kconfig"