1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
5 mainmenu "Linux/PowerPC Kernel Configuration"
11 This option selects whether a 32-bit or a 64-bit kernel
14 config PPC_PM_NEEDS_RTC_LIB
34 config GENERIC_HARDIRQS
42 config RWSEM_GENERIC_SPINLOCK
45 config RWSEM_XCHGADD_ALGORITHM
49 config ARCH_HAS_ILOG2_U32
53 config ARCH_HAS_ILOG2_U64
57 config GENERIC_HWEIGHT
61 config GENERIC_CALIBRATE_DELAY
65 config GENERIC_FIND_NEXT_BIT
83 depends on COMPAT && SYSVIPC
86 # All PPC32s use generic nvram driver through ppc_md
91 config SCHED_NO_NO_OMIT_FRAME_POINTER
95 config ARCH_MAY_HAVE_PC_FDC
97 default !PPC_PSERIES || PCI
102 config PPC_UDBG_16550
106 config GENERIC_TBSYNC
108 default y if PPC32 && SMP
120 config SYS_SUPPORTS_APM_EMULATION
123 config DEFAULT_UIMAGE
126 Used to allow a board to specify it wants a uImage built by default
131 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
134 menu "Processor support"
136 prompt "Processor Type"
141 bool "52xx/6xx/7xx/74xx"
145 There are four families of PowerPC chips supported. The more common
146 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
147 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
148 embedded versions (403 and 405) and the high end 64 bit Power
149 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
151 This option is the catch-all for 6xx types, including some of the
152 embedded versions. Unless there is see an option for the specific
153 chip family you are using, you want this option.
155 You do not want this if you are building a kernel for a 64 bit
156 IBM RS/6000 or an Apple G5, choose 6xx.
158 If unsure, select this option
160 Note that the kernel runs in 32-bit mode even on 64-bit chips.
163 bool "Freescale 82xx"
168 bool "Freescale 83xx"
173 select WANT_DEVICE_TREE
176 bool "Freescale 85xx"
180 select WANT_DEVICE_TREE
183 bool "Freescale 86xx"
190 The Freescale E600 SoCs have 74xx cores.
199 select PPC_DCR_NATIVE
203 select PPC_DCR_NATIVE
204 select WANT_DEVICE_TREE
207 bool "Freescale e200"
212 bool "Optimize for POWER4"
216 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
217 The resulting binary will not work on POWER3 or RS64 processors
218 when compiled with binutils 2.15 or later.
223 default y if !POWER4_ONLY
232 # this is temp to handle compat with arch=ppc
236 # this is temp to handle compat with arch=ppc
240 # this is temp to handle compat with arch=ppc
251 config PPC_DCR_NATIVE
261 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
264 config PPC_OF_PLATFORM_PCI
266 depends on PPC64 # not supported on 32 bits yet
271 depends on 40x || 44x
276 depends on E200 || E500 || 44x
281 depends on E200 || E500
286 depends on 44x || E500
288 default y if E500 && PHYS_64BIT
291 bool 'Large physical address support' if E500
292 depends on 44x || E500
293 select RESOURCES_64BIT
296 This option enables kernel support for larger than 32-bit physical
297 addresses. This features is not be available on all e500 cores.
299 If in doubt, say N here.
302 bool "AltiVec Support"
303 depends on CLASSIC32 || POWER4
305 This option enables kernel support for the Altivec extensions to the
306 PowerPC processor. The kernel currently supports saving and restoring
307 altivec registers, and turning on the 'altivec enable' bit so user
308 processes can execute altivec instructions.
310 This option is only usefully if you have a processor that supports
311 altivec (G4, otherwise known as 74xx series), but does not have
312 any affect on a non-altivec cpu (it does, however add code to the
315 If in doubt, say Y here.
319 depends on E200 || E500
322 This option enables kernel support for the Signal Processing
323 Extensions (SPE) to the PowerPC processor. The kernel currently
324 supports saving and restoring SPE registers, and turning on the
325 'spe enable' bit so user processes can execute SPE instructions.
327 This option is only useful if you have a processor that supports
328 SPE (e500, otherwise known as 85xx series), but does not have any
329 effect on a non-spe cpu (it does, however add code to the kernel).
331 If in doubt, say Y here.
335 depends on 6xx || POWER3 || POWER4 || PPC64
338 config PPC_STD_MMU_32
340 depends on PPC_STD_MMU && PPC32
344 default y if HUGETLB_PAGE
347 config VIRT_CPU_ACCOUNTING
348 bool "Deterministic task and CPU time accounting"
352 Select this option to enable more accurate task and CPU time
353 accounting. This is done by reading a CPU counter on each
354 kernel entry and exit and on transitions within the kernel
355 between system, softirq and hardirq state, so there is a
356 small performance impact. This also enables accounting of
357 stolen time on logically-partitioned systems running on
358 IBM POWER5-based machines.
360 If in doubt, say Y here.
363 depends on PPC_STD_MMU
364 bool "Symmetric multi-processing support"
366 This enables support for systems with more than one CPU. If you have
367 a system with only one CPU, say N. If you have a system with more
368 than one CPU, say Y. Note that the kernel does not currently
369 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
370 since they have inadequate hardware support for multiprocessor
373 If you say N here, the kernel will run on single and multiprocessor
374 machines, but will use only one CPU of a multiprocessor machine. If
375 you say Y here, the kernel will run on single-processor machines.
376 On a single-processor machine, the kernel will run faster if you say
379 If you don't know what to do here, say N.
382 int "Maximum number of CPUs (2-128)"
385 default "32" if PPC64
388 config NOT_COHERENT_CACHE
390 depends on 4xx || 8xx || E200
393 config CONFIG_CHECK_CACHE_COHERENCY
397 source "init/Kconfig"
399 source "arch/powerpc/platforms/Kconfig"
401 menu "Kernel options"
404 bool "High memory support"
407 source kernel/Kconfig.hz
408 source kernel/Kconfig.preempt
409 source "fs/Kconfig.binfmt"
411 # We optimistically allocate largepages from the VM, so make the limit
412 # large enough (16MB). This badly named config option is actually
414 config FORCE_MAX_ZONEORDER
417 default "9" if PPC_64K_PAGES
420 config MATH_EMULATION
421 bool "Math emulation"
422 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
424 Some PowerPC chips designed for embedded applications do not have
425 a floating-point unit and therefore do not implement the
426 floating-point instructions in the PowerPC instruction set. If you
427 say Y here, the kernel will include code to emulate a floating-point
428 unit, which will allow programs that use floating-point
432 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
433 depends on EXPERIMENTAL && PPC64
436 Cause IO segments sent to a device for DMA to be merged virtually
437 by the IOMMU when they happen to have been allocated contiguously.
438 This doesn't add pressure to the IOMMU allocator. However, some
439 drivers don't support getting large merged segments coming back
440 from *_map_sg(). Say Y if you know the drivers you are using are
441 properly handling this case.
444 bool "Support for enabling/disabling CPUs"
445 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
447 Say Y here to be able to disable and re-enable individual
448 CPUs at runtime on SMP machines.
450 Say N if you are unsure.
452 config ARCH_ENABLE_MEMORY_HOTPLUG
456 bool "kexec system call (EXPERIMENTAL)"
457 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
459 kexec is a system call that implements the ability to shutdown your
460 current kernel, and to start another kernel. It is like a reboot
461 but it is independent of the system firmware. And like a reboot
462 you can start any kernel with it, not just Linux.
464 The name comes from the similarity to the exec system call.
466 It is an ongoing process to be certain the hardware in a machine
467 is properly shutdown, so do not be surprised if this code does not
468 initially work for you. It may help to enable device hotplugging
469 support. As of this writing the exact hardware interface is
470 strongly in flux, so no good recommendation can be made.
473 bool "Build a kdump crash kernel (EXPERIMENTAL)"
474 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
476 Build a kernel suitable for use as a kdump capture kernel.
477 The kernel will be linked at a different address than normal, and
478 so can only be used for Kdump.
480 Don't change this unless you know what you are doing.
483 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
484 default y if PPC_PREP
487 bool "Distribute interrupts on all CPUs by default"
488 depends on SMP && !MV64360
490 This option gives the kernel permission to distribute IRQs across
491 multiple CPUs. Saying N here will route all IRQs to the first
492 CPU. Generally saying Y is safe, although some problems have been
493 reported with SMP Power Macintoshes with this option enabled.
498 default y if SMP && PPC_PSERIES
503 depends on NEED_MULTIPLE_NODES
505 config ARCH_SELECT_MEMORY_MODEL
509 config ARCH_FLATMEM_ENABLE
511 depends on (PPC64 && !NUMA) || PPC32
513 config ARCH_SPARSEMEM_ENABLE
517 config ARCH_SPARSEMEM_DEFAULT
519 depends on (SMP && PPC_PSERIES) || PPC_PS3
521 config ARCH_POPULATES_NODE_MAP
526 config ARCH_MEMORY_PROBE
528 depends on MEMORY_HOTPLUG
530 # Some NUMA nodes have memory ranges that span
531 # other nodes. Even though a pfn is valid and
532 # between a node's start and end pfns, it may not
533 # reside on that node. See memmap_init_zone()
535 config NODES_SPAN_OTHER_NODES
537 depends on NEED_MULTIPLE_NODES
539 config PPC_HAS_HASH_64K
547 select PPC_HAS_HASH_64K
549 This option changes the kernel logical page size to 64k. On machines
550 without processor support for 64k pages, the kernel will simulate
551 them by loading each individual 4k page on demand transparently,
552 while on hardware with such support, it will be used to map
553 normal application pages.
556 bool "SMT (Hyperthreading) scheduler support"
557 depends on PPC64 && SMP
559 SMT scheduler support improves the CPU scheduler's decision making
560 when dealing with POWER5 cpus at a cost of slightly increased
561 overhead in some places. If unsure say N here.
563 config PROC_DEVICETREE
564 bool "Support for device tree in /proc"
567 This option adds a device-tree directory under /proc which contains
568 an image of the device tree that the kernel copies from Open
569 Firmware or other boot firmware. If unsure, say Y here.
572 bool "Default bootloader kernel arguments"
575 string "Initial kernel command string"
576 depends on CMDLINE_BOOL
577 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
579 On some platforms, there is currently no way for the boot loader to
580 pass arguments to the kernel. For these platforms, you can supply
581 some command-line options at build time by entering them here. In
582 most cases you will need to specify the root device here.
585 source kernel/power/Kconfig
589 bool "Enable seccomp to safely compute untrusted bytecode"
593 This kernel feature is useful for number crunching applications
594 that may need to compute untrusted bytecode during their
595 execution. By using pipes or other transports made available to
596 the process as file descriptors supporting the read/write
597 syscalls, it's possible to isolate those applications in
598 their own address space using seccomp. Once seccomp is
599 enabled via /proc/<pid>/seccomp, it cannot be disabled
600 and the task is only allowed to execute a few safe syscalls
601 defined by each seccomp mode.
603 If unsure, say Y. Only embedded should say N here.
605 config WANT_DEVICE_TREE
610 string "Static device tree source file"
611 depends on WANT_DEVICE_TREE
613 This specifies the device tree source (.dts) file to be
614 compiled and included when building the bootwrapper. If a
615 relative filename is given, then it will be relative to
616 arch/powerpc/boot/dts. If you are not using the bootwrapper,
617 or do not need to build a dts into the bootwrapper, this
620 For example, this is required when building a cuImage target
621 for an older U-Boot, which cannot pass a device tree itself.
622 Such a kernel will not work with a newer U-Boot that tries to
623 pass a device tree (unless you tell it not to). If your U-Boot
624 does not mention a device tree in "help bootm", then use the
625 cuImage target and specify a device tree here. Otherwise, use
626 the uImage target and leave this field blank.
637 bool "Support for ISA-bus hardware"
638 depends on PPC_PREP || PPC_CHRP
641 Find out whether you have ISA slots on your motherboard. ISA is the
642 name of a bus system, i.e. the way the CPU talks to the other stuff
643 inside your box. If you have an Apple machine, say N here; if you
644 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
645 you have an embedded board, consult your board documentation.
651 config GENERIC_ISA_DMA
653 depends on PPC64 || POWER4 || 6xx && !CPM2
656 config PPC_INDIRECT_PCI
659 default y if 40x || 44x
662 config PPC_INDIRECT_PCI_BE
664 depends PPC_INDIRECT_PCI
680 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
685 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
686 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
687 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
688 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
689 && !PPC_85xx && !PPC_86xx
690 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
691 default PCI_QSPAN if !4xx && !CPM2 && 8xx
692 select ARCH_SUPPORTS_MSI
694 Find out whether your system includes a PCI bus. PCI is the name of
695 a bus system, i.e. the way the CPU talks to the other stuff inside
696 your box. If you say Y here, the kernel will include drivers and
697 infrastructure code to support PCI bus devices.
705 depends on !4xx && !CPM2 && 8xx
708 Say Y here if you have a system based on a Motorola 8xx-series
709 embedded processor with a QSPAN PCI interface, otherwise say N.
713 depends on PCI && 8260
714 select PPC_INDIRECT_PCI
718 bool "Enable workaround for MPC826x erratum PCI 9"
719 depends on PCI_8260 && !ADS8272
723 prompt "IDMA channel for PCI 9 workaround"
726 config 8260_PCI9_IDMA1
729 config 8260_PCI9_IDMA2
732 config 8260_PCI9_IDMA3
735 config 8260_PCI9_IDMA4
740 source "drivers/pci/pcie/Kconfig"
742 source "drivers/pci/Kconfig"
744 source "drivers/pcmcia/Kconfig"
746 source "drivers/pci/hotplug/Kconfig"
750 menu "Advanced setup"
753 config ADVANCED_OPTIONS
754 bool "Prompt for advanced kernel configuration options"
756 This option will enable prompting for a variety of advanced kernel
757 configuration options. These options can cause the kernel to not
758 work if they are set incorrectly, but can be used to optimize certain
759 aspects of kernel memory management.
761 Unless you know what you are doing, say N here.
763 comment "Default settings for advanced configuration options are used"
764 depends on !ADVANCED_OPTIONS
766 config HIGHMEM_START_BOOL
767 bool "Set high memory pool address"
768 depends on ADVANCED_OPTIONS && HIGHMEM
770 This option allows you to set the base address of the kernel virtual
771 area used to map high memory pages. This can be useful in
772 optimizing the layout of kernel virtual memory.
774 Say N here unless you know what you are doing.
777 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
780 config LOWMEM_SIZE_BOOL
781 bool "Set maximum low memory"
782 depends on ADVANCED_OPTIONS
784 This option allows you to set the maximum amount of memory which
785 will be used as "low memory", that is, memory which the kernel can
786 access directly, without having to set up a kernel virtual mapping.
787 This can be useful in optimizing the layout of kernel virtual
790 Say N here unless you know what you are doing.
793 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
796 config KERNEL_START_BOOL
797 bool "Set custom kernel base address"
798 depends on ADVANCED_OPTIONS
800 This option allows you to set the kernel virtual address at which
801 the kernel will map low memory (the kernel image will be linked at
802 this address). This can be useful in optimizing the virtual memory
803 layout of the system.
805 Say N here unless you know what you are doing.
808 hex "Virtual address of kernel base" if KERNEL_START_BOOL
811 config TASK_SIZE_BOOL
812 bool "Set custom user task size"
813 depends on ADVANCED_OPTIONS
815 This option allows you to set the amount of virtual address space
816 allocated to user tasks. This can be useful in optimizing the
817 virtual memory layout of the system.
819 Say N here unless you know what you are doing.
822 hex "Size of user task space" if TASK_SIZE_BOOL
825 config CONSISTENT_START_BOOL
826 bool "Set custom consistent memory pool address"
827 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
829 This option allows you to set the base virtual address
830 of the consistent memory pool. This pool of virtual
831 memory is used to make consistent memory allocations.
833 config CONSISTENT_START
834 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
835 default "0xff100000" if NOT_COHERENT_CACHE
837 config CONSISTENT_SIZE_BOOL
838 bool "Set custom consistent memory pool size"
839 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
841 This option allows you to set the size of the
842 consistent memory pool. This pool of virtual memory
843 is used to make consistent memory allocations.
845 config CONSISTENT_SIZE
846 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
847 default "0x00200000" if NOT_COHERENT_CACHE
849 config BOOT_LOAD_BOOL
850 bool "Set the boot link/load address"
851 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
853 This option allows you to set the initial load address of the zImage
854 or zImage.initrd file. This can be useful if you are on a board
855 which has a small amount of memory.
857 Say N here unless you know what you are doing.
860 hex "Link/load address for booting" if BOOT_LOAD_BOOL
861 default "0x00400000" if 40x || 8xx || 8260
862 default "0x01000000" if 44x
866 bool "Pinned Kernel TLBs (860 ONLY)"
867 depends on ADVANCED_OPTIONS && 8xx
873 default "0xc000000000000000"
878 source "drivers/Kconfig"
882 # XXX source "arch/ppc/8xx_io/Kconfig"
884 # XXX source "arch/ppc/8260_io/Kconfig"
886 source "arch/powerpc/sysdev/qe_lib/Kconfig"
890 menu "Instrumentation Support"
891 depends on EXPERIMENTAL
893 source "arch/powerpc/oprofile/Kconfig"
896 bool "Kprobes (EXPERIMENTAL)"
897 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
899 Kprobes allows you to trap at almost any kernel address and
900 execute a callback function. register_kprobe() establishes
901 a probepoint and specifies the callback. Kprobes is useful
902 for kernel debugging, non-intrusive instrumentation and testing.
903 If in doubt, say "N".
906 source "arch/powerpc/Kconfig.debug"
908 source "security/Kconfig"
912 depends on COMPAT && KEYS
915 source "crypto/Kconfig"