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
124 # Powerpc uses the slab allocator to manage its ptes and the
125 # page structs of ptes are used for splitting the page table
126 # lock for configurations supporting more than SPLIT_PTLOCK_CPUS.
128 # In that special configuration the page structs of slabs are modified.
129 # This setting disables the selection of SLUB as a slab allocator.
131 config ARCH_USES_SLAB_PAGE_STRUCT
134 depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
136 config DEFAULT_UIMAGE
139 Used to allow a board to specify it wants a uImage built by default
144 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
147 menu "Processor support"
149 prompt "Processor Type"
154 bool "52xx/6xx/7xx/74xx"
158 There are four families of PowerPC chips supported. The more common
159 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
160 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
161 embedded versions (403 and 405) and the high end 64 bit Power
162 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
164 This option is the catch-all for 6xx types, including some of the
165 embedded versions. Unless there is see an option for the specific
166 chip family you are using, you want this option.
168 You do not want this if you are building a kernel for a 64 bit
169 IBM RS/6000 or an Apple G5, choose 6xx.
171 If unsure, select this option
173 Note that the kernel runs in 32-bit mode even on 64-bit chips.
176 bool "Freescale 82xx"
181 bool "Freescale 83xx"
186 select WANT_DEVICE_TREE
189 bool "Freescale 85xx"
193 select WANT_DEVICE_TREE
196 bool "Freescale 86xx"
203 The Freescale E600 SoCs have 74xx cores.
212 select PPC_DCR_NATIVE
216 select PPC_DCR_NATIVE
217 select WANT_DEVICE_TREE
220 bool "Freescale e200"
225 bool "Optimize for POWER4"
229 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
230 The resulting binary will not work on POWER3 or RS64 processors
231 when compiled with binutils 2.15 or later.
236 default y if !POWER4_ONLY
245 # this is temp to handle compat with arch=ppc
249 # this is temp to handle compat with arch=ppc
253 # this is temp to handle compat with arch=ppc
264 config PPC_DCR_NATIVE
274 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
277 config PPC_OF_PLATFORM_PCI
279 depends on PPC64 # not supported on 32 bits yet
284 depends on 40x || 44x
289 depends on E200 || E500 || 44x
294 depends on E200 || E500
299 depends on 44x || E500
301 default y if E500 && PHYS_64BIT
304 bool 'Large physical address support' if E500
305 depends on 44x || E500
306 select RESOURCES_64BIT
309 This option enables kernel support for larger than 32-bit physical
310 addresses. This features is not be available on all e500 cores.
312 If in doubt, say N here.
315 bool "AltiVec Support"
316 depends on CLASSIC32 || POWER4
318 This option enables kernel support for the Altivec extensions to the
319 PowerPC processor. The kernel currently supports saving and restoring
320 altivec registers, and turning on the 'altivec enable' bit so user
321 processes can execute altivec instructions.
323 This option is only usefully if you have a processor that supports
324 altivec (G4, otherwise known as 74xx series), but does not have
325 any affect on a non-altivec cpu (it does, however add code to the
328 If in doubt, say Y here.
332 depends on E200 || E500
335 This option enables kernel support for the Signal Processing
336 Extensions (SPE) to the PowerPC processor. The kernel currently
337 supports saving and restoring SPE registers, and turning on the
338 'spe enable' bit so user processes can execute SPE instructions.
340 This option is only useful if you have a processor that supports
341 SPE (e500, otherwise known as 85xx series), but does not have any
342 effect on a non-spe cpu (it does, however add code to the kernel).
344 If in doubt, say Y here.
348 depends on 6xx || POWER3 || POWER4 || PPC64
351 config PPC_STD_MMU_32
353 depends on PPC_STD_MMU && PPC32
355 config VIRT_CPU_ACCOUNTING
356 bool "Deterministic task and CPU time accounting"
360 Select this option to enable more accurate task and CPU time
361 accounting. This is done by reading a CPU counter on each
362 kernel entry and exit and on transitions within the kernel
363 between system, softirq and hardirq state, so there is a
364 small performance impact. This also enables accounting of
365 stolen time on logically-partitioned systems running on
366 IBM POWER5-based machines.
368 If in doubt, say Y here.
371 depends on PPC_STD_MMU
372 bool "Symmetric multi-processing support"
374 This enables support for systems with more than one CPU. If you have
375 a system with only one CPU, say N. If you have a system with more
376 than one CPU, say Y. Note that the kernel does not currently
377 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
378 since they have inadequate hardware support for multiprocessor
381 If you say N here, the kernel will run on single and multiprocessor
382 machines, but will use only one CPU of a multiprocessor machine. If
383 you say Y here, the kernel will run on single-processor machines.
384 On a single-processor machine, the kernel will run faster if you say
387 If you don't know what to do here, say N.
390 int "Maximum number of CPUs (2-128)"
393 default "32" if PPC64
396 config NOT_COHERENT_CACHE
398 depends on 4xx || 8xx || E200
402 source "init/Kconfig"
404 source "arch/powerpc/platforms/Kconfig"
406 menu "Kernel options"
409 bool "High memory support"
412 source kernel/Kconfig.hz
413 source kernel/Kconfig.preempt
414 source "fs/Kconfig.binfmt"
416 # We optimistically allocate largepages from the VM, so make the limit
417 # large enough (16MB). This badly named config option is actually
419 config FORCE_MAX_ZONEORDER
422 default "9" if PPC_64K_PAGES
425 config MATH_EMULATION
426 bool "Math emulation"
427 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
429 Some PowerPC chips designed for embedded applications do not have
430 a floating-point unit and therefore do not implement the
431 floating-point instructions in the PowerPC instruction set. If you
432 say Y here, the kernel will include code to emulate a floating-point
433 unit, which will allow programs that use floating-point
437 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
438 depends on EXPERIMENTAL && PPC64
441 Cause IO segments sent to a device for DMA to be merged virtually
442 by the IOMMU when they happen to have been allocated contiguously.
443 This doesn't add pressure to the IOMMU allocator. However, some
444 drivers don't support getting large merged segments coming back
445 from *_map_sg(). Say Y if you know the drivers you are using are
446 properly handling this case.
449 bool "Support for enabling/disabling CPUs"
450 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
452 Say Y here to be able to disable and re-enable individual
453 CPUs at runtime on SMP machines.
455 Say N if you are unsure.
457 config ARCH_ENABLE_MEMORY_HOTPLUG
461 bool "kexec system call (EXPERIMENTAL)"
462 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
464 kexec is a system call that implements the ability to shutdown your
465 current kernel, and to start another kernel. It is like a reboot
466 but it is independent of the system firmware. And like a reboot
467 you can start any kernel with it, not just Linux.
469 The name comes from the similarity to the exec system call.
471 It is an ongoing process to be certain the hardware in a machine
472 is properly shutdown, so do not be surprised if this code does not
473 initially work for you. It may help to enable device hotplugging
474 support. As of this writing the exact hardware interface is
475 strongly in flux, so no good recommendation can be made.
478 bool "Build a kdump crash kernel (EXPERIMENTAL)"
479 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
481 Build a kernel suitable for use as a kdump capture kernel.
482 The kernel will be linked at a different address than normal, and
483 so can only be used for Kdump.
485 Don't change this unless you know what you are doing.
488 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
489 default y if PPC_PREP
492 bool "Distribute interrupts on all CPUs by default"
493 depends on SMP && !MV64360
495 This option gives the kernel permission to distribute IRQs across
496 multiple CPUs. Saying N here will route all IRQs to the first
497 CPU. Generally saying Y is safe, although some problems have been
498 reported with SMP Power Macintoshes with this option enabled.
503 default y if SMP && PPC_PSERIES
508 depends on NEED_MULTIPLE_NODES
510 config ARCH_SELECT_MEMORY_MODEL
514 config ARCH_FLATMEM_ENABLE
516 depends on (PPC64 && !NUMA) || PPC32
518 config ARCH_SPARSEMEM_ENABLE
522 config ARCH_SPARSEMEM_DEFAULT
524 depends on (SMP && PPC_PSERIES) || PPC_PS3
526 config ARCH_POPULATES_NODE_MAP
531 config ARCH_MEMORY_PROBE
533 depends on MEMORY_HOTPLUG
535 # Some NUMA nodes have memory ranges that span
536 # other nodes. Even though a pfn is valid and
537 # between a node's start and end pfns, it may not
538 # reside on that node. See memmap_init_zone()
540 config NODES_SPAN_OTHER_NODES
542 depends on NEED_MULTIPLE_NODES
548 This option changes the kernel logical page size to 64k. On machines
549 without processor support for 64k pages, the kernel will simulate
550 them by loading each individual 4k page on demand transparently,
551 while on hardware with such support, it will be used to map
552 normal application pages.
555 bool "SMT (Hyperthreading) scheduler support"
556 depends on PPC64 && SMP
558 SMT scheduler support improves the CPU scheduler's decision making
559 when dealing with POWER5 cpus at a cost of slightly increased
560 overhead in some places. If unsure say N here.
562 config PROC_DEVICETREE
563 bool "Support for device tree in /proc"
566 This option adds a device-tree directory under /proc which contains
567 an image of the device tree that the kernel copies from Open
568 Firmware or other boot firmware. If unsure, say Y here.
571 bool "Default bootloader kernel arguments"
574 string "Initial kernel command string"
575 depends on CMDLINE_BOOL
576 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
578 On some platforms, there is currently no way for the boot loader to
579 pass arguments to the kernel. For these platforms, you can supply
580 some command-line options at build time by entering them here. In
581 most cases you will need to specify the root device here.
584 source kernel/power/Kconfig
588 bool "Enable seccomp to safely compute untrusted bytecode"
592 This kernel feature is useful for number crunching applications
593 that may need to compute untrusted bytecode during their
594 execution. By using pipes or other transports made available to
595 the process as file descriptors supporting the read/write
596 syscalls, it's possible to isolate those applications in
597 their own address space using seccomp. Once seccomp is
598 enabled via /proc/<pid>/seccomp, it cannot be disabled
599 and the task is only allowed to execute a few safe syscalls
600 defined by each seccomp mode.
602 If unsure, say Y. Only embedded should say N here.
604 config WANT_DEVICE_TREE
609 string "Static device tree source file"
610 depends on WANT_DEVICE_TREE
612 This specifies the device tree source (.dts) file to be
613 compiled and included when building the bootwrapper. If a
614 relative filename is given, then it will be relative to
615 arch/powerpc/boot/dts. If you are not using the bootwrapper,
616 or do not need to build a dts into the bootwrapper, this
619 For example, this is required when building a cuImage target
620 for an older U-Boot, which cannot pass a device tree itself.
621 Such a kernel will not work with a newer U-Boot that tries to
622 pass a device tree (unless you tell it not to). If your U-Boot
623 does not mention a device tree in "help bootm", then use the
624 cuImage target and specify a device tree here. Otherwise, use
625 the uImage target and leave this field blank.
636 bool "Support for ISA-bus hardware"
637 depends on PPC_PREP || PPC_CHRP
640 Find out whether you have ISA slots on your motherboard. ISA is the
641 name of a bus system, i.e. the way the CPU talks to the other stuff
642 inside your box. If you have an Apple machine, say N here; if you
643 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
644 you have an embedded board, consult your board documentation.
650 config GENERIC_ISA_DMA
652 depends on PPC64 || POWER4 || 6xx && !CPM2
655 config PPC_INDIRECT_PCI
658 default y if 40x || 44x
661 config PPC_INDIRECT_PCI_BE
663 depends PPC_INDIRECT_PCI
679 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
684 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
685 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
686 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
687 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
688 && !PPC_85xx && !PPC_86xx
689 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
690 default PCI_QSPAN if !4xx && !CPM2 && 8xx
691 select ARCH_SUPPORTS_MSI
693 Find out whether your system includes a PCI bus. PCI is the name of
694 a bus system, i.e. the way the CPU talks to the other stuff inside
695 your box. If you say Y here, the kernel will include drivers and
696 infrastructure code to support PCI bus devices.
704 depends on !4xx && !CPM2 && 8xx
707 Say Y here if you have a system based on a Motorola 8xx-series
708 embedded processor with a QSPAN PCI interface, otherwise say N.
712 depends on PCI && 8260
713 select PPC_INDIRECT_PCI
717 bool "Enable workaround for MPC826x erratum PCI 9"
718 depends on PCI_8260 && !ADS8272
722 prompt "IDMA channel for PCI 9 workaround"
725 config 8260_PCI9_IDMA1
728 config 8260_PCI9_IDMA2
731 config 8260_PCI9_IDMA3
734 config 8260_PCI9_IDMA4
739 source "drivers/pci/pcie/Kconfig"
741 source "drivers/pci/Kconfig"
743 source "drivers/pcmcia/Kconfig"
745 source "drivers/pci/hotplug/Kconfig"
749 menu "Advanced setup"
752 config ADVANCED_OPTIONS
753 bool "Prompt for advanced kernel configuration options"
755 This option will enable prompting for a variety of advanced kernel
756 configuration options. These options can cause the kernel to not
757 work if they are set incorrectly, but can be used to optimize certain
758 aspects of kernel memory management.
760 Unless you know what you are doing, say N here.
762 comment "Default settings for advanced configuration options are used"
763 depends on !ADVANCED_OPTIONS
765 config HIGHMEM_START_BOOL
766 bool "Set high memory pool address"
767 depends on ADVANCED_OPTIONS && HIGHMEM
769 This option allows you to set the base address of the kernel virtual
770 area used to map high memory pages. This can be useful in
771 optimizing the layout of kernel virtual memory.
773 Say N here unless you know what you are doing.
776 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
779 config LOWMEM_SIZE_BOOL
780 bool "Set maximum low memory"
781 depends on ADVANCED_OPTIONS
783 This option allows you to set the maximum amount of memory which
784 will be used as "low memory", that is, memory which the kernel can
785 access directly, without having to set up a kernel virtual mapping.
786 This can be useful in optimizing the layout of kernel virtual
789 Say N here unless you know what you are doing.
792 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
795 config KERNEL_START_BOOL
796 bool "Set custom kernel base address"
797 depends on ADVANCED_OPTIONS
799 This option allows you to set the kernel virtual address at which
800 the kernel will map low memory (the kernel image will be linked at
801 this address). This can be useful in optimizing the virtual memory
802 layout of the system.
804 Say N here unless you know what you are doing.
807 hex "Virtual address of kernel base" if KERNEL_START_BOOL
810 config TASK_SIZE_BOOL
811 bool "Set custom user task size"
812 depends on ADVANCED_OPTIONS
814 This option allows you to set the amount of virtual address space
815 allocated to user tasks. This can be useful in optimizing the
816 virtual memory layout of the system.
818 Say N here unless you know what you are doing.
821 hex "Size of user task space" if TASK_SIZE_BOOL
824 config CONSISTENT_START_BOOL
825 bool "Set custom consistent memory pool address"
826 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
828 This option allows you to set the base virtual address
829 of the consistent memory pool. This pool of virtual
830 memory is used to make consistent memory allocations.
832 config CONSISTENT_START
833 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
834 default "0xff100000" if NOT_COHERENT_CACHE
836 config CONSISTENT_SIZE_BOOL
837 bool "Set custom consistent memory pool size"
838 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
840 This option allows you to set the size of the
841 consistent memory pool. This pool of virtual memory
842 is used to make consistent memory allocations.
844 config CONSISTENT_SIZE
845 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
846 default "0x00200000" if NOT_COHERENT_CACHE
848 config BOOT_LOAD_BOOL
849 bool "Set the boot link/load address"
850 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
852 This option allows you to set the initial load address of the zImage
853 or zImage.initrd file. This can be useful if you are on a board
854 which has a small amount of memory.
856 Say N here unless you know what you are doing.
859 hex "Link/load address for booting" if BOOT_LOAD_BOOL
860 default "0x00400000" if 40x || 8xx || 8260
861 default "0x01000000" if 44x
865 bool "Pinned Kernel TLBs (860 ONLY)"
866 depends on ADVANCED_OPTIONS && 8xx
872 default "0xc000000000000000"
877 source "drivers/Kconfig"
881 # XXX source "arch/ppc/8xx_io/Kconfig"
883 # XXX source "arch/ppc/8260_io/Kconfig"
885 source "arch/powerpc/sysdev/qe_lib/Kconfig"
889 menu "Instrumentation Support"
890 depends on EXPERIMENTAL
892 source "arch/powerpc/oprofile/Kconfig"
895 bool "Kprobes (EXPERIMENTAL)"
896 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
898 Kprobes allows you to trap at almost any kernel address and
899 execute a callback function. register_kprobe() establishes
900 a probepoint and specifies the callback. Kprobes is useful
901 for kernel debugging, non-intrusive instrumentation and testing.
902 If in doubt, say "N".
905 source "arch/powerpc/Kconfig.debug"
907 source "security/Kconfig"
911 depends on COMPAT && KEYS
914 source "crypto/Kconfig"