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
69 config ARCH_NO_VIRT_TO_BUS
86 depends on COMPAT && SYSVIPC
89 # All PPC32s use generic nvram driver through ppc_md
94 config SCHED_NO_NO_OMIT_FRAME_POINTER
98 config ARCH_MAY_HAVE_PC_FDC
100 default !PPC_PSERIES || PCI
105 config PPC_UDBG_16550
109 config GENERIC_TBSYNC
111 default y if PPC32 && SMP
123 config SYS_SUPPORTS_APM_EMULATION
124 default y if PMAC_APM_EMU
127 config DEFAULT_UIMAGE
130 Used to allow a board to specify it wants a uImage built by default
135 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
138 menu "Processor support"
140 prompt "Processor Type"
145 bool "52xx/6xx/7xx/74xx"
149 There are four families of PowerPC chips supported. The more common
150 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
151 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
152 embedded versions (403 and 405) and the high end 64 bit Power
153 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
155 This option is the catch-all for 6xx types, including some of the
156 embedded versions. Unless there is see an option for the specific
157 chip family you are using, you want this option.
159 You do not want this if you are building a kernel for a 64 bit
160 IBM RS/6000 or an Apple G5, choose 6xx.
162 If unsure, select this option
164 Note that the kernel runs in 32-bit mode even on 64-bit chips.
167 bool "Freescale 82xx"
172 bool "Freescale 83xx"
177 select WANT_DEVICE_TREE
180 bool "Freescale 85xx"
184 select WANT_DEVICE_TREE
187 bool "Freescale 86xx"
194 The Freescale E600 SoCs have 74xx cores.
203 select PPC_DCR_NATIVE
207 select PPC_DCR_NATIVE
208 select WANT_DEVICE_TREE
211 bool "Freescale e200"
216 bool "Optimize for POWER4"
220 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
221 The resulting binary will not work on POWER3 or RS64 processors
222 when compiled with binutils 2.15 or later.
227 default y if !POWER4_ONLY
236 # this is temp to handle compat with arch=ppc
240 # this is temp to handle compat with arch=ppc
244 # this is temp to handle compat with arch=ppc
255 config PPC_DCR_NATIVE
265 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
268 config PPC_OF_PLATFORM_PCI
270 depends on PPC64 # not supported on 32 bits yet
275 depends on 40x || 44x
280 depends on E200 || E500 || 44x
285 depends on E200 || E500
290 depends on 44x || E500
292 default y if E500 && PHYS_64BIT
295 bool 'Large physical address support' if E500
296 depends on 44x || E500
297 select RESOURCES_64BIT
300 This option enables kernel support for larger than 32-bit physical
301 addresses. This features is not be available on all e500 cores.
303 If in doubt, say N here.
306 bool "AltiVec Support"
307 depends on CLASSIC32 || POWER4
309 This option enables kernel support for the Altivec extensions to the
310 PowerPC processor. The kernel currently supports saving and restoring
311 altivec registers, and turning on the 'altivec enable' bit so user
312 processes can execute altivec instructions.
314 This option is only usefully if you have a processor that supports
315 altivec (G4, otherwise known as 74xx series), but does not have
316 any affect on a non-altivec cpu (it does, however add code to the
319 If in doubt, say Y here.
323 depends on E200 || E500
326 This option enables kernel support for the Signal Processing
327 Extensions (SPE) to the PowerPC processor. The kernel currently
328 supports saving and restoring SPE registers, and turning on the
329 'spe enable' bit so user processes can execute SPE instructions.
331 This option is only useful if you have a processor that supports
332 SPE (e500, otherwise known as 85xx series), but does not have any
333 effect on a non-spe cpu (it does, however add code to the kernel).
335 If in doubt, say Y here.
339 depends on 6xx || POWER3 || POWER4 || PPC64
342 config PPC_STD_MMU_32
344 depends on PPC_STD_MMU && PPC32
348 default y if HUGETLB_PAGE
351 config VIRT_CPU_ACCOUNTING
352 bool "Deterministic task and CPU time accounting"
356 Select this option to enable more accurate task and CPU time
357 accounting. This is done by reading a CPU counter on each
358 kernel entry and exit and on transitions within the kernel
359 between system, softirq and hardirq state, so there is a
360 small performance impact. This also enables accounting of
361 stolen time on logically-partitioned systems running on
362 IBM POWER5-based machines.
364 If in doubt, say Y here.
367 depends on PPC_STD_MMU
368 bool "Symmetric multi-processing support"
370 This enables support for systems with more than one CPU. If you have
371 a system with only one CPU, say N. If you have a system with more
372 than one CPU, say Y. Note that the kernel does not currently
373 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
374 since they have inadequate hardware support for multiprocessor
377 If you say N here, the kernel will run on single and multiprocessor
378 machines, but will use only one CPU of a multiprocessor machine. If
379 you say Y here, the kernel will run on single-processor machines.
380 On a single-processor machine, the kernel will run faster if you say
383 If you don't know what to do here, say N.
386 int "Maximum number of CPUs (2-128)"
389 default "32" if PPC64
392 config NOT_COHERENT_CACHE
394 depends on 4xx || 8xx || E200
397 config CONFIG_CHECK_CACHE_COHERENCY
401 source "init/Kconfig"
403 source "arch/powerpc/platforms/Kconfig"
405 menu "Kernel options"
408 bool "High memory support"
411 source kernel/Kconfig.hz
412 source kernel/Kconfig.preempt
413 source "fs/Kconfig.binfmt"
415 # We optimistically allocate largepages from the VM, so make the limit
416 # large enough (16MB). This badly named config option is actually
418 config FORCE_MAX_ZONEORDER
421 default "9" if PPC_64K_PAGES
424 config MATH_EMULATION
425 bool "Math emulation"
426 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
428 Some PowerPC chips designed for embedded applications do not have
429 a floating-point unit and therefore do not implement the
430 floating-point instructions in the PowerPC instruction set. If you
431 say Y here, the kernel will include code to emulate a floating-point
432 unit, which will allow programs that use floating-point
436 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
437 depends on EXPERIMENTAL && PPC64
440 Cause IO segments sent to a device for DMA to be merged virtually
441 by the IOMMU when they happen to have been allocated contiguously.
442 This doesn't add pressure to the IOMMU allocator. However, some
443 drivers don't support getting large merged segments coming back
444 from *_map_sg(). Say Y if you know the drivers you are using are
445 properly handling this case.
448 bool "Support for enabling/disabling CPUs"
449 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
451 Say Y here to be able to disable and re-enable individual
452 CPUs at runtime on SMP machines.
454 Say N if you are unsure.
456 config ARCH_ENABLE_MEMORY_HOTPLUG
460 bool "kexec system call (EXPERIMENTAL)"
461 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
463 kexec is a system call that implements the ability to shutdown your
464 current kernel, and to start another kernel. It is like a reboot
465 but it is independent of the system firmware. And like a reboot
466 you can start any kernel with it, not just Linux.
468 The name comes from the similarity to the exec system call.
470 It is an ongoing process to be certain the hardware in a machine
471 is properly shutdown, so do not be surprised if this code does not
472 initially work for you. It may help to enable device hotplugging
473 support. As of this writing the exact hardware interface is
474 strongly in flux, so no good recommendation can be made.
477 bool "Build a kdump crash kernel (EXPERIMENTAL)"
478 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
480 Build a kernel suitable for use as a kdump capture kernel.
481 The kernel will be linked at a different address than normal, and
482 so can only be used for Kdump.
484 Don't change this unless you know what you are doing.
487 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
488 default y if PPC_PREP
491 bool "Distribute interrupts on all CPUs by default"
492 depends on SMP && !MV64360
494 This option gives the kernel permission to distribute IRQs across
495 multiple CPUs. Saying N here will route all IRQs to the first
496 CPU. Generally saying Y is safe, although some problems have been
497 reported with SMP Power Macintoshes with this option enabled.
502 default y if SMP && PPC_PSERIES
507 depends on NEED_MULTIPLE_NODES
509 config ARCH_SELECT_MEMORY_MODEL
513 config ARCH_FLATMEM_ENABLE
515 depends on (PPC64 && !NUMA) || PPC32
517 config ARCH_SPARSEMEM_ENABLE
521 config ARCH_SPARSEMEM_DEFAULT
523 depends on (SMP && PPC_PSERIES) || PPC_PS3
525 config ARCH_POPULATES_NODE_MAP
530 config ARCH_MEMORY_PROBE
532 depends on MEMORY_HOTPLUG
534 # Some NUMA nodes have memory ranges that span
535 # other nodes. Even though a pfn is valid and
536 # between a node's start and end pfns, it may not
537 # reside on that node. See memmap_init_zone()
539 config NODES_SPAN_OTHER_NODES
541 depends on NEED_MULTIPLE_NODES
543 config PPC_HAS_HASH_64K
551 select PPC_HAS_HASH_64K
553 This option changes the kernel logical page size to 64k. On machines
554 without processor support for 64k pages, the kernel will simulate
555 them by loading each individual 4k page on demand transparently,
556 while on hardware with such support, it will be used to map
557 normal application pages.
560 bool "SMT (Hyperthreading) scheduler support"
561 depends on PPC64 && SMP
563 SMT scheduler support improves the CPU scheduler's decision making
564 when dealing with POWER5 cpus at a cost of slightly increased
565 overhead in some places. If unsure say N here.
567 config PROC_DEVICETREE
568 bool "Support for device tree in /proc"
571 This option adds a device-tree directory under /proc which contains
572 an image of the device tree that the kernel copies from Open
573 Firmware or other boot firmware. If unsure, say Y here.
576 bool "Default bootloader kernel arguments"
579 string "Initial kernel command string"
580 depends on CMDLINE_BOOL
581 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
583 On some platforms, there is currently no way for the boot loader to
584 pass arguments to the kernel. For these platforms, you can supply
585 some command-line options at build time by entering them here. In
586 most cases you will need to specify the root device here.
589 source kernel/power/Kconfig
593 bool "Enable seccomp to safely compute untrusted bytecode"
597 This kernel feature is useful for number crunching applications
598 that may need to compute untrusted bytecode during their
599 execution. By using pipes or other transports made available to
600 the process as file descriptors supporting the read/write
601 syscalls, it's possible to isolate those applications in
602 their own address space using seccomp. Once seccomp is
603 enabled via /proc/<pid>/seccomp, it cannot be disabled
604 and the task is only allowed to execute a few safe syscalls
605 defined by each seccomp mode.
607 If unsure, say Y. Only embedded should say N here.
609 config WANT_DEVICE_TREE
614 string "Static device tree source file"
615 depends on WANT_DEVICE_TREE
617 This specifies the device tree source (.dts) file to be
618 compiled and included when building the bootwrapper. If a
619 relative filename is given, then it will be relative to
620 arch/powerpc/boot/dts. If you are not using the bootwrapper,
621 or do not need to build a dts into the bootwrapper, this
624 For example, this is required when building a cuImage target
625 for an older U-Boot, which cannot pass a device tree itself.
626 Such a kernel will not work with a newer U-Boot that tries to
627 pass a device tree (unless you tell it not to). If your U-Boot
628 does not mention a device tree in "help bootm", then use the
629 cuImage target and specify a device tree here. Otherwise, use
630 the uImage target and leave this field blank.
641 bool "Support for ISA-bus hardware"
642 depends on PPC_PREP || PPC_CHRP
645 Find out whether you have ISA slots on your motherboard. ISA is the
646 name of a bus system, i.e. the way the CPU talks to the other stuff
647 inside your box. If you have an Apple machine, say N here; if you
648 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
649 you have an embedded board, consult your board documentation.
655 config GENERIC_ISA_DMA
657 depends on PPC64 || POWER4 || 6xx && !CPM2
660 config PPC_INDIRECT_PCI
663 default y if 40x || 44x
666 config PPC_INDIRECT_PCI_BE
668 depends PPC_INDIRECT_PCI
684 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
689 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
690 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
691 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
692 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
693 && !PPC_85xx && !PPC_86xx
694 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
695 default PCI_QSPAN if !4xx && !CPM2 && 8xx
696 select ARCH_SUPPORTS_MSI
698 Find out whether your system includes a PCI bus. PCI is the name of
699 a bus system, i.e. the way the CPU talks to the other stuff inside
700 your box. If you say Y here, the kernel will include drivers and
701 infrastructure code to support PCI bus devices.
711 depends on !4xx && !CPM2 && 8xx
714 Say Y here if you have a system based on a Motorola 8xx-series
715 embedded processor with a QSPAN PCI interface, otherwise say N.
719 depends on PCI && 8260
720 select PPC_INDIRECT_PCI
724 bool "Enable workaround for MPC826x erratum PCI 9"
725 depends on PCI_8260 && !ADS8272
729 prompt "IDMA channel for PCI 9 workaround"
732 config 8260_PCI9_IDMA1
735 config 8260_PCI9_IDMA2
738 config 8260_PCI9_IDMA3
741 config 8260_PCI9_IDMA4
746 source "drivers/pci/pcie/Kconfig"
748 source "drivers/pci/Kconfig"
750 source "drivers/pcmcia/Kconfig"
752 source "drivers/pci/hotplug/Kconfig"
756 menu "Advanced setup"
759 config ADVANCED_OPTIONS
760 bool "Prompt for advanced kernel configuration options"
762 This option will enable prompting for a variety of advanced kernel
763 configuration options. These options can cause the kernel to not
764 work if they are set incorrectly, but can be used to optimize certain
765 aspects of kernel memory management.
767 Unless you know what you are doing, say N here.
769 comment "Default settings for advanced configuration options are used"
770 depends on !ADVANCED_OPTIONS
772 config HIGHMEM_START_BOOL
773 bool "Set high memory pool address"
774 depends on ADVANCED_OPTIONS && HIGHMEM
776 This option allows you to set the base address of the kernel virtual
777 area used to map high memory pages. This can be useful in
778 optimizing the layout of kernel virtual memory.
780 Say N here unless you know what you are doing.
783 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
786 config LOWMEM_SIZE_BOOL
787 bool "Set maximum low memory"
788 depends on ADVANCED_OPTIONS
790 This option allows you to set the maximum amount of memory which
791 will be used as "low memory", that is, memory which the kernel can
792 access directly, without having to set up a kernel virtual mapping.
793 This can be useful in optimizing the layout of kernel virtual
796 Say N here unless you know what you are doing.
799 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
802 config KERNEL_START_BOOL
803 bool "Set custom kernel base address"
804 depends on ADVANCED_OPTIONS
806 This option allows you to set the kernel virtual address at which
807 the kernel will map low memory (the kernel image will be linked at
808 this address). This can be useful in optimizing the virtual memory
809 layout of the system.
811 Say N here unless you know what you are doing.
814 hex "Virtual address of kernel base" if KERNEL_START_BOOL
817 config TASK_SIZE_BOOL
818 bool "Set custom user task size"
819 depends on ADVANCED_OPTIONS
821 This option allows you to set the amount of virtual address space
822 allocated to user tasks. This can be useful in optimizing the
823 virtual memory layout of the system.
825 Say N here unless you know what you are doing.
828 hex "Size of user task space" if TASK_SIZE_BOOL
831 config CONSISTENT_START_BOOL
832 bool "Set custom consistent memory pool address"
833 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
835 This option allows you to set the base virtual address
836 of the consistent memory pool. This pool of virtual
837 memory is used to make consistent memory allocations.
839 config CONSISTENT_START
840 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
841 default "0xff100000" if NOT_COHERENT_CACHE
843 config CONSISTENT_SIZE_BOOL
844 bool "Set custom consistent memory pool size"
845 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
847 This option allows you to set the size of the
848 consistent memory pool. This pool of virtual memory
849 is used to make consistent memory allocations.
851 config CONSISTENT_SIZE
852 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
853 default "0x00200000" if NOT_COHERENT_CACHE
855 config BOOT_LOAD_BOOL
856 bool "Set the boot link/load address"
857 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
859 This option allows you to set the initial load address of the zImage
860 or zImage.initrd file. This can be useful if you are on a board
861 which has a small amount of memory.
863 Say N here unless you know what you are doing.
866 hex "Link/load address for booting" if BOOT_LOAD_BOOL
867 default "0x00400000" if 40x || 8xx || 8260
868 default "0x01000000" if 44x
872 bool "Pinned Kernel TLBs (860 ONLY)"
873 depends on ADVANCED_OPTIONS && 8xx
879 default "0xc000000000000000"
884 source "drivers/Kconfig"
888 # XXX source "arch/ppc/8xx_io/Kconfig"
890 # XXX source "arch/ppc/8260_io/Kconfig"
892 source "arch/powerpc/sysdev/qe_lib/Kconfig"
896 menu "Instrumentation Support"
897 depends on EXPERIMENTAL
899 source "arch/powerpc/oprofile/Kconfig"
902 bool "Kprobes (EXPERIMENTAL)"
903 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
905 Kprobes allows you to trap at almost any kernel address and
906 execute a callback function. register_kprobe() establishes
907 a probepoint and specifies the callback. Kprobes is useful
908 for kernel debugging, non-intrusive instrumentation and testing.
909 If in doubt, say "N".
912 source "arch/powerpc/Kconfig.debug"
914 source "security/Kconfig"
918 depends on COMPAT && KEYS
921 source "crypto/Kconfig"