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"
167 bool "Freescale 85xx"
173 bool "Freescale 86xx"
180 The Freescale E600 SoCs have 74xx cores.
189 select PPC_DCR_NATIVE
193 select PPC_DCR_NATIVE
196 bool "Freescale e200"
201 bool "Optimize for POWER4"
205 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
206 The resulting binary will not work on POWER3 or RS64 processors
207 when compiled with binutils 2.15 or later.
212 default y if !POWER4_ONLY
221 # this is temp to handle compat with arch=ppc
225 # this is temp to handle compat with arch=ppc
229 # this is temp to handle compat with arch=ppc
240 config PPC_DCR_NATIVE
250 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
253 config PPC_OF_PLATFORM_PCI
255 depends on PPC64 # not supported on 32 bits yet
260 depends on E200 || E500
265 depends on E200 || E500
270 depends on 44x || E500
272 default y if E500 && PHYS_64BIT
275 bool 'Large physical address support' if E500
276 depends on 44x || E500
277 select RESOURCES_64BIT
280 This option enables kernel support for larger than 32-bit physical
281 addresses. This features is not be available on all e500 cores.
283 If in doubt, say N here.
286 bool "AltiVec Support"
287 depends on CLASSIC32 || POWER4
289 This option enables kernel support for the Altivec extensions to the
290 PowerPC processor. The kernel currently supports saving and restoring
291 altivec registers, and turning on the 'altivec enable' bit so user
292 processes can execute altivec instructions.
294 This option is only usefully if you have a processor that supports
295 altivec (G4, otherwise known as 74xx series), but does not have
296 any affect on a non-altivec cpu (it does, however add code to the
299 If in doubt, say Y here.
303 depends on E200 || E500
306 This option enables kernel support for the Signal Processing
307 Extensions (SPE) to the PowerPC processor. The kernel currently
308 supports saving and restoring SPE registers, and turning on the
309 'spe enable' bit so user processes can execute SPE instructions.
311 This option is only useful if you have a processor that supports
312 SPE (e500, otherwise known as 85xx series), but does not have any
313 effect on a non-spe cpu (it does, however add code to the kernel).
315 If in doubt, say Y here.
319 depends on 6xx || POWER3 || POWER4 || PPC64
322 config PPC_STD_MMU_32
324 depends on PPC_STD_MMU && PPC32
326 config VIRT_CPU_ACCOUNTING
327 bool "Deterministic task and CPU time accounting"
331 Select this option to enable more accurate task and CPU time
332 accounting. This is done by reading a CPU counter on each
333 kernel entry and exit and on transitions within the kernel
334 between system, softirq and hardirq state, so there is a
335 small performance impact. This also enables accounting of
336 stolen time on logically-partitioned systems running on
337 IBM POWER5-based machines.
339 If in doubt, say Y here.
342 depends on PPC_STD_MMU
343 bool "Symmetric multi-processing support"
345 This enables support for systems with more than one CPU. If you have
346 a system with only one CPU, say N. If you have a system with more
347 than one CPU, say Y. Note that the kernel does not currently
348 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
349 since they have inadequate hardware support for multiprocessor
352 If you say N here, the kernel will run on single and multiprocessor
353 machines, but will use only one CPU of a multiprocessor machine. If
354 you say Y here, the kernel will run on single-processor machines.
355 On a single-processor machine, the kernel will run faster if you say
358 If you don't know what to do here, say N.
361 int "Maximum number of CPUs (2-128)"
364 default "32" if PPC64
367 config NOT_COHERENT_CACHE
369 depends on 4xx || 8xx || E200
373 source "init/Kconfig"
375 source "arch/powerpc/platforms/Kconfig"
377 menu "Kernel options"
380 bool "High memory support"
383 source kernel/Kconfig.hz
384 source kernel/Kconfig.preempt
385 source "fs/Kconfig.binfmt"
387 # We optimistically allocate largepages from the VM, so make the limit
388 # large enough (16MB). This badly named config option is actually
390 config FORCE_MAX_ZONEORDER
393 default "9" if PPC_64K_PAGES
396 config MATH_EMULATION
397 bool "Math emulation"
398 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
400 Some PowerPC chips designed for embedded applications do not have
401 a floating-point unit and therefore do not implement the
402 floating-point instructions in the PowerPC instruction set. If you
403 say Y here, the kernel will include code to emulate a floating-point
404 unit, which will allow programs that use floating-point
408 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
409 depends on EXPERIMENTAL && PPC64
412 Cause IO segments sent to a device for DMA to be merged virtually
413 by the IOMMU when they happen to have been allocated contiguously.
414 This doesn't add pressure to the IOMMU allocator. However, some
415 drivers don't support getting large merged segments coming back
416 from *_map_sg(). Say Y if you know the drivers you are using are
417 properly handling this case.
420 bool "Support for enabling/disabling CPUs"
421 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
423 Say Y here to be able to disable and re-enable individual
424 CPUs at runtime on SMP machines.
426 Say N if you are unsure.
428 config ARCH_ENABLE_MEMORY_HOTPLUG
432 bool "kexec system call (EXPERIMENTAL)"
433 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
435 kexec is a system call that implements the ability to shutdown your
436 current kernel, and to start another kernel. It is like a reboot
437 but it is independent of the system firmware. And like a reboot
438 you can start any kernel with it, not just Linux.
440 The name comes from the similarity to the exec system call.
442 It is an ongoing process to be certain the hardware in a machine
443 is properly shutdown, so do not be surprised if this code does not
444 initially work for you. It may help to enable device hotplugging
445 support. As of this writing the exact hardware interface is
446 strongly in flux, so no good recommendation can be made.
449 bool "Build a kdump crash kernel (EXPERIMENTAL)"
450 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
452 Build a kernel suitable for use as a kdump capture kernel.
453 The kernel will be linked at a different address than normal, and
454 so can only be used for Kdump.
456 Don't change this unless you know what you are doing.
459 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
460 default y if PPC_PREP
463 bool "Distribute interrupts on all CPUs by default"
464 depends on SMP && !MV64360
466 This option gives the kernel permission to distribute IRQs across
467 multiple CPUs. Saying N here will route all IRQs to the first
468 CPU. Generally saying Y is safe, although some problems have been
469 reported with SMP Power Macintoshes with this option enabled.
474 default y if SMP && PPC_PSERIES
479 depends on NEED_MULTIPLE_NODES
481 config ARCH_SELECT_MEMORY_MODEL
485 config ARCH_FLATMEM_ENABLE
487 depends on (PPC64 && !NUMA) || PPC32
489 config ARCH_SPARSEMEM_ENABLE
493 config ARCH_SPARSEMEM_DEFAULT
495 depends on (SMP && PPC_PSERIES) || PPC_PS3
497 config ARCH_POPULATES_NODE_MAP
502 config ARCH_MEMORY_PROBE
504 depends on MEMORY_HOTPLUG
506 # Some NUMA nodes have memory ranges that span
507 # other nodes. Even though a pfn is valid and
508 # between a node's start and end pfns, it may not
509 # reside on that node. See memmap_init_zone()
511 config NODES_SPAN_OTHER_NODES
513 depends on NEED_MULTIPLE_NODES
519 This option changes the kernel logical page size to 64k. On machines
520 without processor support for 64k pages, the kernel will simulate
521 them by loading each individual 4k page on demand transparently,
522 while on hardware with such support, it will be used to map
523 normal application pages.
526 bool "SMT (Hyperthreading) scheduler support"
527 depends on PPC64 && SMP
529 SMT scheduler support improves the CPU scheduler's decision making
530 when dealing with POWER5 cpus at a cost of slightly increased
531 overhead in some places. If unsure say N here.
533 config PROC_DEVICETREE
534 bool "Support for device tree in /proc"
537 This option adds a device-tree directory under /proc which contains
538 an image of the device tree that the kernel copies from Open
539 Firmware or other boot firmware. If unsure, say Y here.
542 bool "Default bootloader kernel arguments"
545 string "Initial kernel command string"
546 depends on CMDLINE_BOOL
547 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
549 On some platforms, there is currently no way for the boot loader to
550 pass arguments to the kernel. For these platforms, you can supply
551 some command-line options at build time by entering them here. In
552 most cases you will need to specify the root device here.
555 source kernel/power/Kconfig
559 bool "Enable seccomp to safely compute untrusted bytecode"
563 This kernel feature is useful for number crunching applications
564 that may need to compute untrusted bytecode during their
565 execution. By using pipes or other transports made available to
566 the process as file descriptors supporting the read/write
567 syscalls, it's possible to isolate those applications in
568 their own address space using seccomp. Once seccomp is
569 enabled via /proc/<pid>/seccomp, it cannot be disabled
570 and the task is only allowed to execute a few safe syscalls
571 defined by each seccomp mode.
573 If unsure, say Y. Only embedded should say N here.
584 bool "Support for ISA-bus hardware"
585 depends on PPC_PREP || PPC_CHRP
588 Find out whether you have ISA slots on your motherboard. ISA is the
589 name of a bus system, i.e. the way the CPU talks to the other stuff
590 inside your box. If you have an Apple machine, say N here; if you
591 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
592 you have an embedded board, consult your board documentation.
598 config GENERIC_ISA_DMA
600 depends on PPC64 || POWER4 || 6xx && !CPM2
603 config PPC_INDIRECT_PCI
606 default y if 40x || 44x
609 config PPC_INDIRECT_PCI_BE
611 depends PPC_INDIRECT_PCI
627 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
632 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
633 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
634 || MPC7448HPC2 || PPC_PS3
635 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
636 && !PPC_85xx && !PPC_86xx
637 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
638 default PCI_QSPAN if !4xx && !CPM2 && 8xx
640 Find out whether your system includes a PCI bus. PCI is the name of
641 a bus system, i.e. the way the CPU talks to the other stuff inside
642 your box. If you say Y here, the kernel will include drivers and
643 infrastructure code to support PCI bus devices.
651 depends on !4xx && !CPM2 && 8xx
654 Say Y here if you have a system based on a Motorola 8xx-series
655 embedded processor with a QSPAN PCI interface, otherwise say N.
659 depends on PCI && 8260
660 select PPC_INDIRECT_PCI
664 bool "Enable workaround for MPC826x erratum PCI 9"
665 depends on PCI_8260 && !ADS8272
669 prompt "IDMA channel for PCI 9 workaround"
672 config 8260_PCI9_IDMA1
675 config 8260_PCI9_IDMA2
678 config 8260_PCI9_IDMA3
681 config 8260_PCI9_IDMA4
686 source "drivers/pci/pcie/Kconfig"
688 source "drivers/pci/Kconfig"
690 source "drivers/pcmcia/Kconfig"
692 source "drivers/pci/hotplug/Kconfig"
696 menu "Advanced setup"
699 config ADVANCED_OPTIONS
700 bool "Prompt for advanced kernel configuration options"
702 This option will enable prompting for a variety of advanced kernel
703 configuration options. These options can cause the kernel to not
704 work if they are set incorrectly, but can be used to optimize certain
705 aspects of kernel memory management.
707 Unless you know what you are doing, say N here.
709 comment "Default settings for advanced configuration options are used"
710 depends on !ADVANCED_OPTIONS
712 config HIGHMEM_START_BOOL
713 bool "Set high memory pool address"
714 depends on ADVANCED_OPTIONS && HIGHMEM
716 This option allows you to set the base address of the kernel virtual
717 area used to map high memory pages. This can be useful in
718 optimizing the layout of kernel virtual memory.
720 Say N here unless you know what you are doing.
723 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
726 config LOWMEM_SIZE_BOOL
727 bool "Set maximum low memory"
728 depends on ADVANCED_OPTIONS
730 This option allows you to set the maximum amount of memory which
731 will be used as "low memory", that is, memory which the kernel can
732 access directly, without having to set up a kernel virtual mapping.
733 This can be useful in optimizing the layout of kernel virtual
736 Say N here unless you know what you are doing.
739 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
742 config KERNEL_START_BOOL
743 bool "Set custom kernel base address"
744 depends on ADVANCED_OPTIONS
746 This option allows you to set the kernel virtual address at which
747 the kernel will map low memory (the kernel image will be linked at
748 this address). This can be useful in optimizing the virtual memory
749 layout of the system.
751 Say N here unless you know what you are doing.
754 hex "Virtual address of kernel base" if KERNEL_START_BOOL
757 config TASK_SIZE_BOOL
758 bool "Set custom user task size"
759 depends on ADVANCED_OPTIONS
761 This option allows you to set the amount of virtual address space
762 allocated to user tasks. This can be useful in optimizing the
763 virtual memory layout of the system.
765 Say N here unless you know what you are doing.
768 hex "Size of user task space" if TASK_SIZE_BOOL
771 config CONSISTENT_START_BOOL
772 bool "Set custom consistent memory pool address"
773 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
775 This option allows you to set the base virtual address
776 of the consistent memory pool. This pool of virtual
777 memory is used to make consistent memory allocations.
779 config CONSISTENT_START
780 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
781 default "0xff100000" if NOT_COHERENT_CACHE
783 config CONSISTENT_SIZE_BOOL
784 bool "Set custom consistent memory pool size"
785 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
787 This option allows you to set the size of the
788 consistent memory pool. This pool of virtual memory
789 is used to make consistent memory allocations.
791 config CONSISTENT_SIZE
792 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
793 default "0x00200000" if NOT_COHERENT_CACHE
795 config BOOT_LOAD_BOOL
796 bool "Set the boot link/load address"
797 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
799 This option allows you to set the initial load address of the zImage
800 or zImage.initrd file. This can be useful if you are on a board
801 which has a small amount of memory.
803 Say N here unless you know what you are doing.
806 hex "Link/load address for booting" if BOOT_LOAD_BOOL
807 default "0x00400000" if 40x || 8xx || 8260
808 default "0x01000000" if 44x
812 bool "Pinned Kernel TLBs (860 ONLY)"
813 depends on ADVANCED_OPTIONS && 8xx
819 default "0xc000000000000000"
824 source "drivers/Kconfig"
828 # XXX source "arch/ppc/8xx_io/Kconfig"
830 # XXX source "arch/ppc/8260_io/Kconfig"
832 source "arch/powerpc/sysdev/qe_lib/Kconfig"
836 menu "Instrumentation Support"
837 depends on EXPERIMENTAL
839 source "arch/powerpc/oprofile/Kconfig"
842 bool "Kprobes (EXPERIMENTAL)"
843 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
845 Kprobes allows you to trap at almost any kernel address and
846 execute a callback function. register_kprobe() establishes
847 a probepoint and specifies the callback. Kprobes is useful
848 for kernel debugging, non-intrusive instrumentation and testing.
849 If in doubt, say "N".
852 source "arch/powerpc/Kconfig.debug"
854 source "security/Kconfig"
858 depends on COMPAT && KEYS
861 source "crypto/Kconfig"