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 DEFAULT_UIMAGE
123 Used to allow a board to specify it wants a uImage built by default
126 menu "Processor support"
128 prompt "Processor Type"
133 bool "52xx/6xx/7xx/74xx"
137 There are four families of PowerPC chips supported. The more common
138 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
139 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
140 embedded versions (403 and 405) and the high end 64 bit Power
141 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
143 This option is the catch-all for 6xx types, including some of the
144 embedded versions. Unless there is see an option for the specific
145 chip family you are using, you want this option.
147 You do not want this if you are building a kernel for a 64 bit
148 IBM RS/6000 or an Apple G5, choose 6xx.
150 If unsure, select this option
152 Note that the kernel runs in 32-bit mode even on 64-bit chips.
155 bool "Freescale 82xx"
160 bool "Freescale 83xx"
165 select WANT_DEVICE_TREE
168 bool "Freescale 85xx"
172 select WANT_DEVICE_TREE
175 bool "Freescale 86xx"
182 The Freescale E600 SoCs have 74xx cores.
191 select PPC_DCR_NATIVE
195 select PPC_DCR_NATIVE
198 bool "Freescale e200"
203 bool "Optimize for POWER4"
207 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
208 The resulting binary will not work on POWER3 or RS64 processors
209 when compiled with binutils 2.15 or later.
214 default y if !POWER4_ONLY
223 # this is temp to handle compat with arch=ppc
227 # this is temp to handle compat with arch=ppc
231 # this is temp to handle compat with arch=ppc
242 config PPC_DCR_NATIVE
252 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
255 config PPC_OF_PLATFORM_PCI
257 depends on PPC64 # not supported on 32 bits yet
262 depends on E200 || E500
267 depends on E200 || E500
272 depends on 44x || E500
274 default y if E500 && PHYS_64BIT
277 bool 'Large physical address support' if E500
278 depends on 44x || E500
279 select RESOURCES_64BIT
282 This option enables kernel support for larger than 32-bit physical
283 addresses. This features is not be available on all e500 cores.
285 If in doubt, say N here.
288 bool "AltiVec Support"
289 depends on CLASSIC32 || POWER4
291 This option enables kernel support for the Altivec extensions to the
292 PowerPC processor. The kernel currently supports saving and restoring
293 altivec registers, and turning on the 'altivec enable' bit so user
294 processes can execute altivec instructions.
296 This option is only usefully if you have a processor that supports
297 altivec (G4, otherwise known as 74xx series), but does not have
298 any affect on a non-altivec cpu (it does, however add code to the
301 If in doubt, say Y here.
305 depends on E200 || E500
308 This option enables kernel support for the Signal Processing
309 Extensions (SPE) to the PowerPC processor. The kernel currently
310 supports saving and restoring SPE registers, and turning on the
311 'spe enable' bit so user processes can execute SPE instructions.
313 This option is only useful if you have a processor that supports
314 SPE (e500, otherwise known as 85xx series), but does not have any
315 effect on a non-spe cpu (it does, however add code to the kernel).
317 If in doubt, say Y here.
321 depends on 6xx || POWER3 || POWER4 || PPC64
324 config PPC_STD_MMU_32
326 depends on PPC_STD_MMU && PPC32
328 config VIRT_CPU_ACCOUNTING
329 bool "Deterministic task and CPU time accounting"
333 Select this option to enable more accurate task and CPU time
334 accounting. This is done by reading a CPU counter on each
335 kernel entry and exit and on transitions within the kernel
336 between system, softirq and hardirq state, so there is a
337 small performance impact. This also enables accounting of
338 stolen time on logically-partitioned systems running on
339 IBM POWER5-based machines.
341 If in doubt, say Y here.
344 depends on PPC_STD_MMU
345 bool "Symmetric multi-processing support"
347 This enables support for systems with more than one CPU. If you have
348 a system with only one CPU, say N. If you have a system with more
349 than one CPU, say Y. Note that the kernel does not currently
350 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
351 since they have inadequate hardware support for multiprocessor
354 If you say N here, the kernel will run on single and multiprocessor
355 machines, but will use only one CPU of a multiprocessor machine. If
356 you say Y here, the kernel will run on single-processor machines.
357 On a single-processor machine, the kernel will run faster if you say
360 If you don't know what to do here, say N.
363 int "Maximum number of CPUs (2-128)"
366 default "32" if PPC64
369 config NOT_COHERENT_CACHE
371 depends on 4xx || 8xx || E200
375 source "init/Kconfig"
377 source "arch/powerpc/platforms/Kconfig"
379 menu "Kernel options"
382 bool "High memory support"
385 source kernel/Kconfig.hz
386 source kernel/Kconfig.preempt
387 source "fs/Kconfig.binfmt"
389 # We optimistically allocate largepages from the VM, so make the limit
390 # large enough (16MB). This badly named config option is actually
392 config FORCE_MAX_ZONEORDER
395 default "9" if PPC_64K_PAGES
398 config MATH_EMULATION
399 bool "Math emulation"
400 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
402 Some PowerPC chips designed for embedded applications do not have
403 a floating-point unit and therefore do not implement the
404 floating-point instructions in the PowerPC instruction set. If you
405 say Y here, the kernel will include code to emulate a floating-point
406 unit, which will allow programs that use floating-point
410 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
411 depends on EXPERIMENTAL && PPC64
414 Cause IO segments sent to a device for DMA to be merged virtually
415 by the IOMMU when they happen to have been allocated contiguously.
416 This doesn't add pressure to the IOMMU allocator. However, some
417 drivers don't support getting large merged segments coming back
418 from *_map_sg(). Say Y if you know the drivers you are using are
419 properly handling this case.
422 bool "Support for enabling/disabling CPUs"
423 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
425 Say Y here to be able to disable and re-enable individual
426 CPUs at runtime on SMP machines.
428 Say N if you are unsure.
430 config ARCH_ENABLE_MEMORY_HOTPLUG
434 bool "kexec system call (EXPERIMENTAL)"
435 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
437 kexec is a system call that implements the ability to shutdown your
438 current kernel, and to start another kernel. It is like a reboot
439 but it is independent of the system firmware. And like a reboot
440 you can start any kernel with it, not just Linux.
442 The name comes from the similarity to the exec system call.
444 It is an ongoing process to be certain the hardware in a machine
445 is properly shutdown, so do not be surprised if this code does not
446 initially work for you. It may help to enable device hotplugging
447 support. As of this writing the exact hardware interface is
448 strongly in flux, so no good recommendation can be made.
451 bool "Build a kdump crash kernel (EXPERIMENTAL)"
452 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
454 Build a kernel suitable for use as a kdump capture kernel.
455 The kernel will be linked at a different address than normal, and
456 so can only be used for Kdump.
458 Don't change this unless you know what you are doing.
461 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
462 default y if PPC_PREP
465 bool "Distribute interrupts on all CPUs by default"
466 depends on SMP && !MV64360
468 This option gives the kernel permission to distribute IRQs across
469 multiple CPUs. Saying N here will route all IRQs to the first
470 CPU. Generally saying Y is safe, although some problems have been
471 reported with SMP Power Macintoshes with this option enabled.
476 default y if SMP && PPC_PSERIES
481 depends on NEED_MULTIPLE_NODES
483 config ARCH_SELECT_MEMORY_MODEL
487 config ARCH_FLATMEM_ENABLE
489 depends on (PPC64 && !NUMA) || PPC32
491 config ARCH_SPARSEMEM_ENABLE
495 config ARCH_SPARSEMEM_DEFAULT
497 depends on (SMP && PPC_PSERIES) || PPC_PS3
499 config ARCH_POPULATES_NODE_MAP
504 config ARCH_MEMORY_PROBE
506 depends on MEMORY_HOTPLUG
508 # Some NUMA nodes have memory ranges that span
509 # other nodes. Even though a pfn is valid and
510 # between a node's start and end pfns, it may not
511 # reside on that node. See memmap_init_zone()
513 config NODES_SPAN_OTHER_NODES
515 depends on NEED_MULTIPLE_NODES
521 This option changes the kernel logical page size to 64k. On machines
522 without processor support for 64k pages, the kernel will simulate
523 them by loading each individual 4k page on demand transparently,
524 while on hardware with such support, it will be used to map
525 normal application pages.
528 bool "SMT (Hyperthreading) scheduler support"
529 depends on PPC64 && SMP
531 SMT scheduler support improves the CPU scheduler's decision making
532 when dealing with POWER5 cpus at a cost of slightly increased
533 overhead in some places. If unsure say N here.
535 config PROC_DEVICETREE
536 bool "Support for device tree in /proc"
539 This option adds a device-tree directory under /proc which contains
540 an image of the device tree that the kernel copies from Open
541 Firmware or other boot firmware. If unsure, say Y here.
544 bool "Default bootloader kernel arguments"
547 string "Initial kernel command string"
548 depends on CMDLINE_BOOL
549 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
551 On some platforms, there is currently no way for the boot loader to
552 pass arguments to the kernel. For these platforms, you can supply
553 some command-line options at build time by entering them here. In
554 most cases you will need to specify the root device here.
557 source kernel/power/Kconfig
561 bool "Enable seccomp to safely compute untrusted bytecode"
565 This kernel feature is useful for number crunching applications
566 that may need to compute untrusted bytecode during their
567 execution. By using pipes or other transports made available to
568 the process as file descriptors supporting the read/write
569 syscalls, it's possible to isolate those applications in
570 their own address space using seccomp. Once seccomp is
571 enabled via /proc/<pid>/seccomp, it cannot be disabled
572 and the task is only allowed to execute a few safe syscalls
573 defined by each seccomp mode.
575 If unsure, say Y. Only embedded should say N here.
577 config WANT_DEVICE_TREE
582 string "Static device tree source file"
583 depends on WANT_DEVICE_TREE
585 This specifies the device tree source (.dts) file to be
586 compiled and included when building the bootwrapper. If a
587 relative filename is given, then it will be relative to
588 arch/powerpc/boot/dts. If you are not using the bootwrapper,
589 or do not need to build a dts into the bootwrapper, this
592 For example, this is required when building a cuImage target
593 for an older U-Boot, which cannot pass a device tree itself.
594 Such a kernel will not work with a newer U-Boot that tries to
595 pass a device tree (unless you tell it not to). If your U-Boot
596 does not mention a device tree in "help bootm", then use the
597 cuImage target and specify a device tree here. Otherwise, use
598 the uImage target and leave this field blank.
609 bool "Support for ISA-bus hardware"
610 depends on PPC_PREP || PPC_CHRP
613 Find out whether you have ISA slots on your motherboard. ISA is the
614 name of a bus system, i.e. the way the CPU talks to the other stuff
615 inside your box. If you have an Apple machine, say N here; if you
616 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
617 you have an embedded board, consult your board documentation.
623 config GENERIC_ISA_DMA
625 depends on PPC64 || POWER4 || 6xx && !CPM2
628 config PPC_INDIRECT_PCI
631 default y if 40x || 44x
634 config PPC_INDIRECT_PCI_BE
636 depends PPC_INDIRECT_PCI
652 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
657 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
658 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
659 || MPC7448HPC2 || PPC_PS3
660 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
661 && !PPC_85xx && !PPC_86xx
662 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
663 default PCI_QSPAN if !4xx && !CPM2 && 8xx
665 Find out whether your system includes a PCI bus. PCI is the name of
666 a bus system, i.e. the way the CPU talks to the other stuff inside
667 your box. If you say Y here, the kernel will include drivers and
668 infrastructure code to support PCI bus devices.
676 depends on !4xx && !CPM2 && 8xx
679 Say Y here if you have a system based on a Motorola 8xx-series
680 embedded processor with a QSPAN PCI interface, otherwise say N.
684 depends on PCI && 8260
685 select PPC_INDIRECT_PCI
689 bool "Enable workaround for MPC826x erratum PCI 9"
690 depends on PCI_8260 && !ADS8272
694 prompt "IDMA channel for PCI 9 workaround"
697 config 8260_PCI9_IDMA1
700 config 8260_PCI9_IDMA2
703 config 8260_PCI9_IDMA3
706 config 8260_PCI9_IDMA4
711 source "drivers/pci/pcie/Kconfig"
713 source "drivers/pci/Kconfig"
715 source "drivers/pcmcia/Kconfig"
717 source "drivers/pci/hotplug/Kconfig"
721 menu "Advanced setup"
724 config ADVANCED_OPTIONS
725 bool "Prompt for advanced kernel configuration options"
727 This option will enable prompting for a variety of advanced kernel
728 configuration options. These options can cause the kernel to not
729 work if they are set incorrectly, but can be used to optimize certain
730 aspects of kernel memory management.
732 Unless you know what you are doing, say N here.
734 comment "Default settings for advanced configuration options are used"
735 depends on !ADVANCED_OPTIONS
737 config HIGHMEM_START_BOOL
738 bool "Set high memory pool address"
739 depends on ADVANCED_OPTIONS && HIGHMEM
741 This option allows you to set the base address of the kernel virtual
742 area used to map high memory pages. This can be useful in
743 optimizing the layout of kernel virtual memory.
745 Say N here unless you know what you are doing.
748 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
751 config LOWMEM_SIZE_BOOL
752 bool "Set maximum low memory"
753 depends on ADVANCED_OPTIONS
755 This option allows you to set the maximum amount of memory which
756 will be used as "low memory", that is, memory which the kernel can
757 access directly, without having to set up a kernel virtual mapping.
758 This can be useful in optimizing the layout of kernel virtual
761 Say N here unless you know what you are doing.
764 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
767 config KERNEL_START_BOOL
768 bool "Set custom kernel base address"
769 depends on ADVANCED_OPTIONS
771 This option allows you to set the kernel virtual address at which
772 the kernel will map low memory (the kernel image will be linked at
773 this address). This can be useful in optimizing the virtual memory
774 layout of the system.
776 Say N here unless you know what you are doing.
779 hex "Virtual address of kernel base" if KERNEL_START_BOOL
782 config TASK_SIZE_BOOL
783 bool "Set custom user task size"
784 depends on ADVANCED_OPTIONS
786 This option allows you to set the amount of virtual address space
787 allocated to user tasks. This can be useful in optimizing the
788 virtual memory layout of the system.
790 Say N here unless you know what you are doing.
793 hex "Size of user task space" if TASK_SIZE_BOOL
796 config CONSISTENT_START_BOOL
797 bool "Set custom consistent memory pool address"
798 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
800 This option allows you to set the base virtual address
801 of the consistent memory pool. This pool of virtual
802 memory is used to make consistent memory allocations.
804 config CONSISTENT_START
805 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
806 default "0xff100000" if NOT_COHERENT_CACHE
808 config CONSISTENT_SIZE_BOOL
809 bool "Set custom consistent memory pool size"
810 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
812 This option allows you to set the size of the
813 consistent memory pool. This pool of virtual memory
814 is used to make consistent memory allocations.
816 config CONSISTENT_SIZE
817 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
818 default "0x00200000" if NOT_COHERENT_CACHE
820 config BOOT_LOAD_BOOL
821 bool "Set the boot link/load address"
822 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
824 This option allows you to set the initial load address of the zImage
825 or zImage.initrd file. This can be useful if you are on a board
826 which has a small amount of memory.
828 Say N here unless you know what you are doing.
831 hex "Link/load address for booting" if BOOT_LOAD_BOOL
832 default "0x00400000" if 40x || 8xx || 8260
833 default "0x01000000" if 44x
837 bool "Pinned Kernel TLBs (860 ONLY)"
838 depends on ADVANCED_OPTIONS && 8xx
844 default "0xc000000000000000"
849 source "drivers/Kconfig"
853 # XXX source "arch/ppc/8xx_io/Kconfig"
855 # XXX source "arch/ppc/8260_io/Kconfig"
857 source "arch/powerpc/sysdev/qe_lib/Kconfig"
861 menu "Instrumentation Support"
862 depends on EXPERIMENTAL
864 source "arch/powerpc/oprofile/Kconfig"
867 bool "Kprobes (EXPERIMENTAL)"
868 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
870 Kprobes allows you to trap at almost any kernel address and
871 execute a callback function. register_kprobe() establishes
872 a probepoint and specifies the callback. Kprobes is useful
873 for kernel debugging, non-intrusive instrumentation and testing.
874 If in doubt, say "N".
877 source "arch/powerpc/Kconfig.debug"
879 source "security/Kconfig"
883 depends on COMPAT && KEYS
886 source "crypto/Kconfig"