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
394 source "init/Kconfig"
396 source "arch/powerpc/platforms/Kconfig"
398 menu "Kernel options"
401 bool "High memory support"
404 source kernel/Kconfig.hz
405 source kernel/Kconfig.preempt
406 source "fs/Kconfig.binfmt"
408 # We optimistically allocate largepages from the VM, so make the limit
409 # large enough (16MB). This badly named config option is actually
411 config FORCE_MAX_ZONEORDER
414 default "9" if PPC_64K_PAGES
417 config MATH_EMULATION
418 bool "Math emulation"
419 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
421 Some PowerPC chips designed for embedded applications do not have
422 a floating-point unit and therefore do not implement the
423 floating-point instructions in the PowerPC instruction set. If you
424 say Y here, the kernel will include code to emulate a floating-point
425 unit, which will allow programs that use floating-point
429 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
430 depends on EXPERIMENTAL && PPC64
433 Cause IO segments sent to a device for DMA to be merged virtually
434 by the IOMMU when they happen to have been allocated contiguously.
435 This doesn't add pressure to the IOMMU allocator. However, some
436 drivers don't support getting large merged segments coming back
437 from *_map_sg(). Say Y if you know the drivers you are using are
438 properly handling this case.
441 bool "Support for enabling/disabling CPUs"
442 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
444 Say Y here to be able to disable and re-enable individual
445 CPUs at runtime on SMP machines.
447 Say N if you are unsure.
449 config ARCH_ENABLE_MEMORY_HOTPLUG
453 bool "kexec system call (EXPERIMENTAL)"
454 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
456 kexec is a system call that implements the ability to shutdown your
457 current kernel, and to start another kernel. It is like a reboot
458 but it is independent of the system firmware. And like a reboot
459 you can start any kernel with it, not just Linux.
461 The name comes from the similarity to the exec system call.
463 It is an ongoing process to be certain the hardware in a machine
464 is properly shutdown, so do not be surprised if this code does not
465 initially work for you. It may help to enable device hotplugging
466 support. As of this writing the exact hardware interface is
467 strongly in flux, so no good recommendation can be made.
470 bool "Build a kdump crash kernel (EXPERIMENTAL)"
471 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
473 Build a kernel suitable for use as a kdump capture kernel.
474 The kernel will be linked at a different address than normal, and
475 so can only be used for Kdump.
477 Don't change this unless you know what you are doing.
480 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
481 default y if PPC_PREP
484 bool "Distribute interrupts on all CPUs by default"
485 depends on SMP && !MV64360
487 This option gives the kernel permission to distribute IRQs across
488 multiple CPUs. Saying N here will route all IRQs to the first
489 CPU. Generally saying Y is safe, although some problems have been
490 reported with SMP Power Macintoshes with this option enabled.
495 default y if SMP && PPC_PSERIES
500 depends on NEED_MULTIPLE_NODES
502 config ARCH_SELECT_MEMORY_MODEL
506 config ARCH_FLATMEM_ENABLE
508 depends on (PPC64 && !NUMA) || PPC32
510 config ARCH_SPARSEMEM_ENABLE
514 config ARCH_SPARSEMEM_DEFAULT
516 depends on (SMP && PPC_PSERIES) || PPC_PS3
518 config ARCH_POPULATES_NODE_MAP
523 config ARCH_MEMORY_PROBE
525 depends on MEMORY_HOTPLUG
527 # Some NUMA nodes have memory ranges that span
528 # other nodes. Even though a pfn is valid and
529 # between a node's start and end pfns, it may not
530 # reside on that node. See memmap_init_zone()
532 config NODES_SPAN_OTHER_NODES
534 depends on NEED_MULTIPLE_NODES
536 config PPC_HAS_HASH_64K
544 select PPC_HAS_HASH_64K
546 This option changes the kernel logical page size to 64k. On machines
547 without processor support for 64k pages, the kernel will simulate
548 them by loading each individual 4k page on demand transparently,
549 while on hardware with such support, it will be used to map
550 normal application pages.
553 bool "SMT (Hyperthreading) scheduler support"
554 depends on PPC64 && SMP
556 SMT scheduler support improves the CPU scheduler's decision making
557 when dealing with POWER5 cpus at a cost of slightly increased
558 overhead in some places. If unsure say N here.
560 config PROC_DEVICETREE
561 bool "Support for device tree in /proc"
564 This option adds a device-tree directory under /proc which contains
565 an image of the device tree that the kernel copies from Open
566 Firmware or other boot firmware. If unsure, say Y here.
569 bool "Default bootloader kernel arguments"
572 string "Initial kernel command string"
573 depends on CMDLINE_BOOL
574 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
576 On some platforms, there is currently no way for the boot loader to
577 pass arguments to the kernel. For these platforms, you can supply
578 some command-line options at build time by entering them here. In
579 most cases you will need to specify the root device here.
582 source kernel/power/Kconfig
586 bool "Enable seccomp to safely compute untrusted bytecode"
590 This kernel feature is useful for number crunching applications
591 that may need to compute untrusted bytecode during their
592 execution. By using pipes or other transports made available to
593 the process as file descriptors supporting the read/write
594 syscalls, it's possible to isolate those applications in
595 their own address space using seccomp. Once seccomp is
596 enabled via /proc/<pid>/seccomp, it cannot be disabled
597 and the task is only allowed to execute a few safe syscalls
598 defined by each seccomp mode.
600 If unsure, say Y. Only embedded should say N here.
602 config WANT_DEVICE_TREE
607 string "Static device tree source file"
608 depends on WANT_DEVICE_TREE
610 This specifies the device tree source (.dts) file to be
611 compiled and included when building the bootwrapper. If a
612 relative filename is given, then it will be relative to
613 arch/powerpc/boot/dts. If you are not using the bootwrapper,
614 or do not need to build a dts into the bootwrapper, this
617 For example, this is required when building a cuImage target
618 for an older U-Boot, which cannot pass a device tree itself.
619 Such a kernel will not work with a newer U-Boot that tries to
620 pass a device tree (unless you tell it not to). If your U-Boot
621 does not mention a device tree in "help bootm", then use the
622 cuImage target and specify a device tree here. Otherwise, use
623 the uImage target and leave this field blank.
634 bool "Support for ISA-bus hardware"
635 depends on PPC_PREP || PPC_CHRP
638 Find out whether you have ISA slots on your motherboard. ISA is the
639 name of a bus system, i.e. the way the CPU talks to the other stuff
640 inside your box. If you have an Apple machine, say N here; if you
641 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
642 you have an embedded board, consult your board documentation.
648 config GENERIC_ISA_DMA
650 depends on PPC64 || POWER4 || 6xx && !CPM2
653 config PPC_INDIRECT_PCI
656 default y if 40x || 44x
659 config PPC_INDIRECT_PCI_BE
661 depends PPC_INDIRECT_PCI
677 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
682 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
683 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
684 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
685 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
686 && !PPC_85xx && !PPC_86xx
687 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
688 default PCI_QSPAN if !4xx && !CPM2 && 8xx
689 select ARCH_SUPPORTS_MSI
691 Find out whether your system includes a PCI bus. PCI is the name of
692 a bus system, i.e. the way the CPU talks to the other stuff inside
693 your box. If you say Y here, the kernel will include drivers and
694 infrastructure code to support PCI bus devices.
702 depends on !4xx && !CPM2 && 8xx
705 Say Y here if you have a system based on a Motorola 8xx-series
706 embedded processor with a QSPAN PCI interface, otherwise say N.
710 depends on PCI && 8260
711 select PPC_INDIRECT_PCI
715 bool "Enable workaround for MPC826x erratum PCI 9"
716 depends on PCI_8260 && !ADS8272
720 prompt "IDMA channel for PCI 9 workaround"
723 config 8260_PCI9_IDMA1
726 config 8260_PCI9_IDMA2
729 config 8260_PCI9_IDMA3
732 config 8260_PCI9_IDMA4
737 source "drivers/pci/pcie/Kconfig"
739 source "drivers/pci/Kconfig"
741 source "drivers/pcmcia/Kconfig"
743 source "drivers/pci/hotplug/Kconfig"
747 menu "Advanced setup"
750 config ADVANCED_OPTIONS
751 bool "Prompt for advanced kernel configuration options"
753 This option will enable prompting for a variety of advanced kernel
754 configuration options. These options can cause the kernel to not
755 work if they are set incorrectly, but can be used to optimize certain
756 aspects of kernel memory management.
758 Unless you know what you are doing, say N here.
760 comment "Default settings for advanced configuration options are used"
761 depends on !ADVANCED_OPTIONS
763 config HIGHMEM_START_BOOL
764 bool "Set high memory pool address"
765 depends on ADVANCED_OPTIONS && HIGHMEM
767 This option allows you to set the base address of the kernel virtual
768 area used to map high memory pages. This can be useful in
769 optimizing the layout of kernel virtual memory.
771 Say N here unless you know what you are doing.
774 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
777 config LOWMEM_SIZE_BOOL
778 bool "Set maximum low memory"
779 depends on ADVANCED_OPTIONS
781 This option allows you to set the maximum amount of memory which
782 will be used as "low memory", that is, memory which the kernel can
783 access directly, without having to set up a kernel virtual mapping.
784 This can be useful in optimizing the layout of kernel virtual
787 Say N here unless you know what you are doing.
790 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
793 config KERNEL_START_BOOL
794 bool "Set custom kernel base address"
795 depends on ADVANCED_OPTIONS
797 This option allows you to set the kernel virtual address at which
798 the kernel will map low memory (the kernel image will be linked at
799 this address). This can be useful in optimizing the virtual memory
800 layout of the system.
802 Say N here unless you know what you are doing.
805 hex "Virtual address of kernel base" if KERNEL_START_BOOL
808 config TASK_SIZE_BOOL
809 bool "Set custom user task size"
810 depends on ADVANCED_OPTIONS
812 This option allows you to set the amount of virtual address space
813 allocated to user tasks. This can be useful in optimizing the
814 virtual memory layout of the system.
816 Say N here unless you know what you are doing.
819 hex "Size of user task space" if TASK_SIZE_BOOL
822 config CONSISTENT_START_BOOL
823 bool "Set custom consistent memory pool address"
824 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
826 This option allows you to set the base virtual address
827 of the consistent memory pool. This pool of virtual
828 memory is used to make consistent memory allocations.
830 config CONSISTENT_START
831 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
832 default "0xff100000" if NOT_COHERENT_CACHE
834 config CONSISTENT_SIZE_BOOL
835 bool "Set custom consistent memory pool size"
836 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
838 This option allows you to set the size of the
839 consistent memory pool. This pool of virtual memory
840 is used to make consistent memory allocations.
842 config CONSISTENT_SIZE
843 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
844 default "0x00200000" if NOT_COHERENT_CACHE
846 config BOOT_LOAD_BOOL
847 bool "Set the boot link/load address"
848 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
850 This option allows you to set the initial load address of the zImage
851 or zImage.initrd file. This can be useful if you are on a board
852 which has a small amount of memory.
854 Say N here unless you know what you are doing.
857 hex "Link/load address for booting" if BOOT_LOAD_BOOL
858 default "0x00400000" if 40x || 8xx || 8260
859 default "0x01000000" if 44x
863 bool "Pinned Kernel TLBs (860 ONLY)"
864 depends on ADVANCED_OPTIONS && 8xx
870 default "0xc000000000000000"
875 source "drivers/Kconfig"
879 # XXX source "arch/ppc/8xx_io/Kconfig"
881 # XXX source "arch/ppc/8260_io/Kconfig"
883 source "arch/powerpc/sysdev/qe_lib/Kconfig"
887 menu "Instrumentation Support"
888 depends on EXPERIMENTAL
890 source "arch/powerpc/oprofile/Kconfig"
893 bool "Kprobes (EXPERIMENTAL)"
894 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
896 Kprobes allows you to trap at almost any kernel address and
897 execute a callback function. register_kprobe() establishes
898 a probepoint and specifies the callback. Kprobes is useful
899 for kernel debugging, non-intrusive instrumentation and testing.
900 If in doubt, say "N".
903 source "arch/powerpc/Kconfig.debug"
905 source "security/Kconfig"
909 depends on COMPAT && KEYS
912 source "crypto/Kconfig"