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
206 bool "Freescale e200"
211 bool "Optimize for POWER4"
215 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
216 The resulting binary will not work on POWER3 or RS64 processors
217 when compiled with binutils 2.15 or later.
222 default y if !POWER4_ONLY
231 # this is temp to handle compat with arch=ppc
235 # this is temp to handle compat with arch=ppc
239 # this is temp to handle compat with arch=ppc
250 config PPC_DCR_NATIVE
260 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
263 config PPC_OF_PLATFORM_PCI
265 depends on PPC64 # not supported on 32 bits yet
270 depends on E200 || E500
275 depends on E200 || E500
280 depends on 44x || E500
282 default y if E500 && PHYS_64BIT
285 bool 'Large physical address support' if E500
286 depends on 44x || E500
287 select RESOURCES_64BIT
290 This option enables kernel support for larger than 32-bit physical
291 addresses. This features is not be available on all e500 cores.
293 If in doubt, say N here.
296 bool "AltiVec Support"
297 depends on CLASSIC32 || POWER4
299 This option enables kernel support for the Altivec extensions to the
300 PowerPC processor. The kernel currently supports saving and restoring
301 altivec registers, and turning on the 'altivec enable' bit so user
302 processes can execute altivec instructions.
304 This option is only usefully if you have a processor that supports
305 altivec (G4, otherwise known as 74xx series), but does not have
306 any affect on a non-altivec cpu (it does, however add code to the
309 If in doubt, say Y here.
313 depends on E200 || E500
316 This option enables kernel support for the Signal Processing
317 Extensions (SPE) to the PowerPC processor. The kernel currently
318 supports saving and restoring SPE registers, and turning on the
319 'spe enable' bit so user processes can execute SPE instructions.
321 This option is only useful if you have a processor that supports
322 SPE (e500, otherwise known as 85xx series), but does not have any
323 effect on a non-spe cpu (it does, however add code to the kernel).
325 If in doubt, say Y here.
329 depends on 6xx || POWER3 || POWER4 || PPC64
332 config PPC_STD_MMU_32
334 depends on PPC_STD_MMU && PPC32
336 config VIRT_CPU_ACCOUNTING
337 bool "Deterministic task and CPU time accounting"
341 Select this option to enable more accurate task and CPU time
342 accounting. This is done by reading a CPU counter on each
343 kernel entry and exit and on transitions within the kernel
344 between system, softirq and hardirq state, so there is a
345 small performance impact. This also enables accounting of
346 stolen time on logically-partitioned systems running on
347 IBM POWER5-based machines.
349 If in doubt, say Y here.
352 depends on PPC_STD_MMU
353 bool "Symmetric multi-processing support"
355 This enables support for systems with more than one CPU. If you have
356 a system with only one CPU, say N. If you have a system with more
357 than one CPU, say Y. Note that the kernel does not currently
358 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
359 since they have inadequate hardware support for multiprocessor
362 If you say N here, the kernel will run on single and multiprocessor
363 machines, but will use only one CPU of a multiprocessor machine. If
364 you say Y here, the kernel will run on single-processor machines.
365 On a single-processor machine, the kernel will run faster if you say
368 If you don't know what to do here, say N.
371 int "Maximum number of CPUs (2-128)"
374 default "32" if PPC64
377 config NOT_COHERENT_CACHE
379 depends on 4xx || 8xx || E200
383 source "init/Kconfig"
385 source "arch/powerpc/platforms/Kconfig"
387 menu "Kernel options"
390 bool "High memory support"
393 source kernel/Kconfig.hz
394 source kernel/Kconfig.preempt
395 source "fs/Kconfig.binfmt"
397 # We optimistically allocate largepages from the VM, so make the limit
398 # large enough (16MB). This badly named config option is actually
400 config FORCE_MAX_ZONEORDER
403 default "9" if PPC_64K_PAGES
406 config MATH_EMULATION
407 bool "Math emulation"
408 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
410 Some PowerPC chips designed for embedded applications do not have
411 a floating-point unit and therefore do not implement the
412 floating-point instructions in the PowerPC instruction set. If you
413 say Y here, the kernel will include code to emulate a floating-point
414 unit, which will allow programs that use floating-point
418 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
419 depends on EXPERIMENTAL && PPC64
422 Cause IO segments sent to a device for DMA to be merged virtually
423 by the IOMMU when they happen to have been allocated contiguously.
424 This doesn't add pressure to the IOMMU allocator. However, some
425 drivers don't support getting large merged segments coming back
426 from *_map_sg(). Say Y if you know the drivers you are using are
427 properly handling this case.
430 bool "Support for enabling/disabling CPUs"
431 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
433 Say Y here to be able to disable and re-enable individual
434 CPUs at runtime on SMP machines.
436 Say N if you are unsure.
438 config ARCH_ENABLE_MEMORY_HOTPLUG
442 bool "kexec system call (EXPERIMENTAL)"
443 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
445 kexec is a system call that implements the ability to shutdown your
446 current kernel, and to start another kernel. It is like a reboot
447 but it is independent of the system firmware. And like a reboot
448 you can start any kernel with it, not just Linux.
450 The name comes from the similarity to the exec system call.
452 It is an ongoing process to be certain the hardware in a machine
453 is properly shutdown, so do not be surprised if this code does not
454 initially work for you. It may help to enable device hotplugging
455 support. As of this writing the exact hardware interface is
456 strongly in flux, so no good recommendation can be made.
459 bool "Build a kdump crash kernel (EXPERIMENTAL)"
460 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
462 Build a kernel suitable for use as a kdump capture kernel.
463 The kernel will be linked at a different address than normal, and
464 so can only be used for Kdump.
466 Don't change this unless you know what you are doing.
469 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
470 default y if PPC_PREP
473 bool "Distribute interrupts on all CPUs by default"
474 depends on SMP && !MV64360
476 This option gives the kernel permission to distribute IRQs across
477 multiple CPUs. Saying N here will route all IRQs to the first
478 CPU. Generally saying Y is safe, although some problems have been
479 reported with SMP Power Macintoshes with this option enabled.
484 default y if SMP && PPC_PSERIES
489 depends on NEED_MULTIPLE_NODES
491 config ARCH_SELECT_MEMORY_MODEL
495 config ARCH_FLATMEM_ENABLE
497 depends on (PPC64 && !NUMA) || PPC32
499 config ARCH_SPARSEMEM_ENABLE
503 config ARCH_SPARSEMEM_DEFAULT
505 depends on (SMP && PPC_PSERIES) || PPC_PS3
507 config ARCH_POPULATES_NODE_MAP
512 config ARCH_MEMORY_PROBE
514 depends on MEMORY_HOTPLUG
516 # Some NUMA nodes have memory ranges that span
517 # other nodes. Even though a pfn is valid and
518 # between a node's start and end pfns, it may not
519 # reside on that node. See memmap_init_zone()
521 config NODES_SPAN_OTHER_NODES
523 depends on NEED_MULTIPLE_NODES
529 This option changes the kernel logical page size to 64k. On machines
530 without processor support for 64k pages, the kernel will simulate
531 them by loading each individual 4k page on demand transparently,
532 while on hardware with such support, it will be used to map
533 normal application pages.
536 bool "SMT (Hyperthreading) scheduler support"
537 depends on PPC64 && SMP
539 SMT scheduler support improves the CPU scheduler's decision making
540 when dealing with POWER5 cpus at a cost of slightly increased
541 overhead in some places. If unsure say N here.
543 config PROC_DEVICETREE
544 bool "Support for device tree in /proc"
547 This option adds a device-tree directory under /proc which contains
548 an image of the device tree that the kernel copies from Open
549 Firmware or other boot firmware. If unsure, say Y here.
552 bool "Default bootloader kernel arguments"
555 string "Initial kernel command string"
556 depends on CMDLINE_BOOL
557 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
559 On some platforms, there is currently no way for the boot loader to
560 pass arguments to the kernel. For these platforms, you can supply
561 some command-line options at build time by entering them here. In
562 most cases you will need to specify the root device here.
565 source kernel/power/Kconfig
569 bool "Enable seccomp to safely compute untrusted bytecode"
573 This kernel feature is useful for number crunching applications
574 that may need to compute untrusted bytecode during their
575 execution. By using pipes or other transports made available to
576 the process as file descriptors supporting the read/write
577 syscalls, it's possible to isolate those applications in
578 their own address space using seccomp. Once seccomp is
579 enabled via /proc/<pid>/seccomp, it cannot be disabled
580 and the task is only allowed to execute a few safe syscalls
581 defined by each seccomp mode.
583 If unsure, say Y. Only embedded should say N here.
585 config WANT_DEVICE_TREE
590 string "Static device tree source file"
591 depends on WANT_DEVICE_TREE
593 This specifies the device tree source (.dts) file to be
594 compiled and included when building the bootwrapper. If a
595 relative filename is given, then it will be relative to
596 arch/powerpc/boot/dts. If you are not using the bootwrapper,
597 or do not need to build a dts into the bootwrapper, this
600 For example, this is required when building a cuImage target
601 for an older U-Boot, which cannot pass a device tree itself.
602 Such a kernel will not work with a newer U-Boot that tries to
603 pass a device tree (unless you tell it not to). If your U-Boot
604 does not mention a device tree in "help bootm", then use the
605 cuImage target and specify a device tree here. Otherwise, use
606 the uImage target and leave this field blank.
617 bool "Support for ISA-bus hardware"
618 depends on PPC_PREP || PPC_CHRP
621 Find out whether you have ISA slots on your motherboard. ISA is the
622 name of a bus system, i.e. the way the CPU talks to the other stuff
623 inside your box. If you have an Apple machine, say N here; if you
624 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
625 you have an embedded board, consult your board documentation.
631 config GENERIC_ISA_DMA
633 depends on PPC64 || POWER4 || 6xx && !CPM2
636 config PPC_INDIRECT_PCI
639 default y if 40x || 44x
642 config PPC_INDIRECT_PCI_BE
644 depends PPC_INDIRECT_PCI
660 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
665 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
666 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
667 || MPC7448HPC2 || PPC_PS3
668 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
669 && !PPC_85xx && !PPC_86xx
670 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
671 default PCI_QSPAN if !4xx && !CPM2 && 8xx
673 Find out whether your system includes a PCI bus. PCI is the name of
674 a bus system, i.e. the way the CPU talks to the other stuff inside
675 your box. If you say Y here, the kernel will include drivers and
676 infrastructure code to support PCI bus devices.
684 depends on !4xx && !CPM2 && 8xx
687 Say Y here if you have a system based on a Motorola 8xx-series
688 embedded processor with a QSPAN PCI interface, otherwise say N.
692 depends on PCI && 8260
693 select PPC_INDIRECT_PCI
697 bool "Enable workaround for MPC826x erratum PCI 9"
698 depends on PCI_8260 && !ADS8272
702 prompt "IDMA channel for PCI 9 workaround"
705 config 8260_PCI9_IDMA1
708 config 8260_PCI9_IDMA2
711 config 8260_PCI9_IDMA3
714 config 8260_PCI9_IDMA4
719 source "drivers/pci/pcie/Kconfig"
721 source "drivers/pci/Kconfig"
723 source "drivers/pcmcia/Kconfig"
725 source "drivers/pci/hotplug/Kconfig"
729 menu "Advanced setup"
732 config ADVANCED_OPTIONS
733 bool "Prompt for advanced kernel configuration options"
735 This option will enable prompting for a variety of advanced kernel
736 configuration options. These options can cause the kernel to not
737 work if they are set incorrectly, but can be used to optimize certain
738 aspects of kernel memory management.
740 Unless you know what you are doing, say N here.
742 comment "Default settings for advanced configuration options are used"
743 depends on !ADVANCED_OPTIONS
745 config HIGHMEM_START_BOOL
746 bool "Set high memory pool address"
747 depends on ADVANCED_OPTIONS && HIGHMEM
749 This option allows you to set the base address of the kernel virtual
750 area used to map high memory pages. This can be useful in
751 optimizing the layout of kernel virtual memory.
753 Say N here unless you know what you are doing.
756 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
759 config LOWMEM_SIZE_BOOL
760 bool "Set maximum low memory"
761 depends on ADVANCED_OPTIONS
763 This option allows you to set the maximum amount of memory which
764 will be used as "low memory", that is, memory which the kernel can
765 access directly, without having to set up a kernel virtual mapping.
766 This can be useful in optimizing the layout of kernel virtual
769 Say N here unless you know what you are doing.
772 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
775 config KERNEL_START_BOOL
776 bool "Set custom kernel base address"
777 depends on ADVANCED_OPTIONS
779 This option allows you to set the kernel virtual address at which
780 the kernel will map low memory (the kernel image will be linked at
781 this address). This can be useful in optimizing the virtual memory
782 layout of the system.
784 Say N here unless you know what you are doing.
787 hex "Virtual address of kernel base" if KERNEL_START_BOOL
790 config TASK_SIZE_BOOL
791 bool "Set custom user task size"
792 depends on ADVANCED_OPTIONS
794 This option allows you to set the amount of virtual address space
795 allocated to user tasks. This can be useful in optimizing the
796 virtual memory layout of the system.
798 Say N here unless you know what you are doing.
801 hex "Size of user task space" if TASK_SIZE_BOOL
804 config CONSISTENT_START_BOOL
805 bool "Set custom consistent memory pool address"
806 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
808 This option allows you to set the base virtual address
809 of the consistent memory pool. This pool of virtual
810 memory is used to make consistent memory allocations.
812 config CONSISTENT_START
813 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
814 default "0xff100000" if NOT_COHERENT_CACHE
816 config CONSISTENT_SIZE_BOOL
817 bool "Set custom consistent memory pool size"
818 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
820 This option allows you to set the size of the
821 consistent memory pool. This pool of virtual memory
822 is used to make consistent memory allocations.
824 config CONSISTENT_SIZE
825 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
826 default "0x00200000" if NOT_COHERENT_CACHE
828 config BOOT_LOAD_BOOL
829 bool "Set the boot link/load address"
830 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
832 This option allows you to set the initial load address of the zImage
833 or zImage.initrd file. This can be useful if you are on a board
834 which has a small amount of memory.
836 Say N here unless you know what you are doing.
839 hex "Link/load address for booting" if BOOT_LOAD_BOOL
840 default "0x00400000" if 40x || 8xx || 8260
841 default "0x01000000" if 44x
845 bool "Pinned Kernel TLBs (860 ONLY)"
846 depends on ADVANCED_OPTIONS && 8xx
852 default "0xc000000000000000"
857 source "drivers/Kconfig"
861 # XXX source "arch/ppc/8xx_io/Kconfig"
863 # XXX source "arch/ppc/8260_io/Kconfig"
865 source "arch/powerpc/sysdev/qe_lib/Kconfig"
869 menu "Instrumentation Support"
870 depends on EXPERIMENTAL
872 source "arch/powerpc/oprofile/Kconfig"
875 bool "Kprobes (EXPERIMENTAL)"
876 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
878 Kprobes allows you to trap at almost any kernel address and
879 execute a callback function. register_kprobe() establishes
880 a probepoint and specifies the callback. Kprobes is useful
881 for kernel debugging, non-intrusive instrumentation and testing.
882 If in doubt, say "N".
885 source "arch/powerpc/Kconfig.debug"
887 source "security/Kconfig"
891 depends on COMPAT && KEYS
894 source "crypto/Kconfig"