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
124 # Powerpc uses the slab allocator to manage its ptes and the
125 # page structs of ptes are used for splitting the page table
126 # lock for configurations supporting more than SPLIT_PTLOCK_CPUS.
128 # In that special configuration the page structs of slabs are modified.
129 # This setting disables the selection of SLUB as a slab allocator.
131 config ARCH_USES_SLAB_PAGE_STRUCT
134 depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
136 config DEFAULT_UIMAGE
139 Used to allow a board to specify it wants a uImage built by default
144 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
147 menu "Processor support"
149 prompt "Processor Type"
154 bool "52xx/6xx/7xx/74xx"
158 There are four families of PowerPC chips supported. The more common
159 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
160 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
161 embedded versions (403 and 405) and the high end 64 bit Power
162 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
164 This option is the catch-all for 6xx types, including some of the
165 embedded versions. Unless there is see an option for the specific
166 chip family you are using, you want this option.
168 You do not want this if you are building a kernel for a 64 bit
169 IBM RS/6000 or an Apple G5, choose 6xx.
171 If unsure, select this option
173 Note that the kernel runs in 32-bit mode even on 64-bit chips.
176 bool "Freescale 82xx"
181 bool "Freescale 83xx"
186 select WANT_DEVICE_TREE
189 bool "Freescale 85xx"
193 select WANT_DEVICE_TREE
196 bool "Freescale 86xx"
203 The Freescale E600 SoCs have 74xx cores.
212 select PPC_DCR_NATIVE
216 select PPC_DCR_NATIVE
219 bool "Freescale e200"
224 bool "Optimize for POWER4"
228 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
229 The resulting binary will not work on POWER3 or RS64 processors
230 when compiled with binutils 2.15 or later.
235 default y if !POWER4_ONLY
244 # this is temp to handle compat with arch=ppc
248 # this is temp to handle compat with arch=ppc
252 # this is temp to handle compat with arch=ppc
263 config PPC_DCR_NATIVE
273 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
276 config PPC_OF_PLATFORM_PCI
278 depends on PPC64 # not supported on 32 bits yet
283 depends on E200 || E500
288 depends on E200 || E500
293 depends on 44x || E500
295 default y if E500 && PHYS_64BIT
298 bool 'Large physical address support' if E500
299 depends on 44x || E500
300 select RESOURCES_64BIT
303 This option enables kernel support for larger than 32-bit physical
304 addresses. This features is not be available on all e500 cores.
306 If in doubt, say N here.
309 bool "AltiVec Support"
310 depends on CLASSIC32 || POWER4
312 This option enables kernel support for the Altivec extensions to the
313 PowerPC processor. The kernel currently supports saving and restoring
314 altivec registers, and turning on the 'altivec enable' bit so user
315 processes can execute altivec instructions.
317 This option is only usefully if you have a processor that supports
318 altivec (G4, otherwise known as 74xx series), but does not have
319 any affect on a non-altivec cpu (it does, however add code to the
322 If in doubt, say Y here.
326 depends on E200 || E500
329 This option enables kernel support for the Signal Processing
330 Extensions (SPE) to the PowerPC processor. The kernel currently
331 supports saving and restoring SPE registers, and turning on the
332 'spe enable' bit so user processes can execute SPE instructions.
334 This option is only useful if you have a processor that supports
335 SPE (e500, otherwise known as 85xx series), but does not have any
336 effect on a non-spe cpu (it does, however add code to the kernel).
338 If in doubt, say Y here.
342 depends on 6xx || POWER3 || POWER4 || PPC64
345 config PPC_STD_MMU_32
347 depends on PPC_STD_MMU && PPC32
349 config VIRT_CPU_ACCOUNTING
350 bool "Deterministic task and CPU time accounting"
354 Select this option to enable more accurate task and CPU time
355 accounting. This is done by reading a CPU counter on each
356 kernel entry and exit and on transitions within the kernel
357 between system, softirq and hardirq state, so there is a
358 small performance impact. This also enables accounting of
359 stolen time on logically-partitioned systems running on
360 IBM POWER5-based machines.
362 If in doubt, say Y here.
365 depends on PPC_STD_MMU
366 bool "Symmetric multi-processing support"
368 This enables support for systems with more than one CPU. If you have
369 a system with only one CPU, say N. If you have a system with more
370 than one CPU, say Y. Note that the kernel does not currently
371 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
372 since they have inadequate hardware support for multiprocessor
375 If you say N here, the kernel will run on single and multiprocessor
376 machines, but will use only one CPU of a multiprocessor machine. If
377 you say Y here, the kernel will run on single-processor machines.
378 On a single-processor machine, the kernel will run faster if you say
381 If you don't know what to do here, say N.
384 int "Maximum number of CPUs (2-128)"
387 default "32" if PPC64
390 config NOT_COHERENT_CACHE
392 depends on 4xx || 8xx || E200
396 source "init/Kconfig"
398 source "arch/powerpc/platforms/Kconfig"
400 menu "Kernel options"
403 bool "High memory support"
406 source kernel/Kconfig.hz
407 source kernel/Kconfig.preempt
408 source "fs/Kconfig.binfmt"
410 # We optimistically allocate largepages from the VM, so make the limit
411 # large enough (16MB). This badly named config option is actually
413 config FORCE_MAX_ZONEORDER
416 default "9" if PPC_64K_PAGES
419 config MATH_EMULATION
420 bool "Math emulation"
421 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
423 Some PowerPC chips designed for embedded applications do not have
424 a floating-point unit and therefore do not implement the
425 floating-point instructions in the PowerPC instruction set. If you
426 say Y here, the kernel will include code to emulate a floating-point
427 unit, which will allow programs that use floating-point
431 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
432 depends on EXPERIMENTAL && PPC64
435 Cause IO segments sent to a device for DMA to be merged virtually
436 by the IOMMU when they happen to have been allocated contiguously.
437 This doesn't add pressure to the IOMMU allocator. However, some
438 drivers don't support getting large merged segments coming back
439 from *_map_sg(). Say Y if you know the drivers you are using are
440 properly handling this case.
443 bool "Support for enabling/disabling CPUs"
444 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
446 Say Y here to be able to disable and re-enable individual
447 CPUs at runtime on SMP machines.
449 Say N if you are unsure.
451 config ARCH_ENABLE_MEMORY_HOTPLUG
455 bool "kexec system call (EXPERIMENTAL)"
456 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
458 kexec is a system call that implements the ability to shutdown your
459 current kernel, and to start another kernel. It is like a reboot
460 but it is independent of the system firmware. And like a reboot
461 you can start any kernel with it, not just Linux.
463 The name comes from the similarity to the exec system call.
465 It is an ongoing process to be certain the hardware in a machine
466 is properly shutdown, so do not be surprised if this code does not
467 initially work for you. It may help to enable device hotplugging
468 support. As of this writing the exact hardware interface is
469 strongly in flux, so no good recommendation can be made.
472 bool "Build a kdump crash kernel (EXPERIMENTAL)"
473 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
475 Build a kernel suitable for use as a kdump capture kernel.
476 The kernel will be linked at a different address than normal, and
477 so can only be used for Kdump.
479 Don't change this unless you know what you are doing.
482 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
483 default y if PPC_PREP
486 bool "Distribute interrupts on all CPUs by default"
487 depends on SMP && !MV64360
489 This option gives the kernel permission to distribute IRQs across
490 multiple CPUs. Saying N here will route all IRQs to the first
491 CPU. Generally saying Y is safe, although some problems have been
492 reported with SMP Power Macintoshes with this option enabled.
497 default y if SMP && PPC_PSERIES
502 depends on NEED_MULTIPLE_NODES
504 config ARCH_SELECT_MEMORY_MODEL
508 config ARCH_FLATMEM_ENABLE
510 depends on (PPC64 && !NUMA) || PPC32
512 config ARCH_SPARSEMEM_ENABLE
516 config ARCH_SPARSEMEM_DEFAULT
518 depends on (SMP && PPC_PSERIES) || PPC_PS3
520 config ARCH_POPULATES_NODE_MAP
525 config ARCH_MEMORY_PROBE
527 depends on MEMORY_HOTPLUG
529 # Some NUMA nodes have memory ranges that span
530 # other nodes. Even though a pfn is valid and
531 # between a node's start and end pfns, it may not
532 # reside on that node. See memmap_init_zone()
534 config NODES_SPAN_OTHER_NODES
536 depends on NEED_MULTIPLE_NODES
542 This option changes the kernel logical page size to 64k. On machines
543 without processor support for 64k pages, the kernel will simulate
544 them by loading each individual 4k page on demand transparently,
545 while on hardware with such support, it will be used to map
546 normal application pages.
549 bool "SMT (Hyperthreading) scheduler support"
550 depends on PPC64 && SMP
552 SMT scheduler support improves the CPU scheduler's decision making
553 when dealing with POWER5 cpus at a cost of slightly increased
554 overhead in some places. If unsure say N here.
556 config PROC_DEVICETREE
557 bool "Support for device tree in /proc"
560 This option adds a device-tree directory under /proc which contains
561 an image of the device tree that the kernel copies from Open
562 Firmware or other boot firmware. If unsure, say Y here.
565 bool "Default bootloader kernel arguments"
568 string "Initial kernel command string"
569 depends on CMDLINE_BOOL
570 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
572 On some platforms, there is currently no way for the boot loader to
573 pass arguments to the kernel. For these platforms, you can supply
574 some command-line options at build time by entering them here. In
575 most cases you will need to specify the root device here.
578 source kernel/power/Kconfig
582 bool "Enable seccomp to safely compute untrusted bytecode"
586 This kernel feature is useful for number crunching applications
587 that may need to compute untrusted bytecode during their
588 execution. By using pipes or other transports made available to
589 the process as file descriptors supporting the read/write
590 syscalls, it's possible to isolate those applications in
591 their own address space using seccomp. Once seccomp is
592 enabled via /proc/<pid>/seccomp, it cannot be disabled
593 and the task is only allowed to execute a few safe syscalls
594 defined by each seccomp mode.
596 If unsure, say Y. Only embedded should say N here.
598 config WANT_DEVICE_TREE
603 string "Static device tree source file"
604 depends on WANT_DEVICE_TREE
606 This specifies the device tree source (.dts) file to be
607 compiled and included when building the bootwrapper. If a
608 relative filename is given, then it will be relative to
609 arch/powerpc/boot/dts. If you are not using the bootwrapper,
610 or do not need to build a dts into the bootwrapper, this
613 For example, this is required when building a cuImage target
614 for an older U-Boot, which cannot pass a device tree itself.
615 Such a kernel will not work with a newer U-Boot that tries to
616 pass a device tree (unless you tell it not to). If your U-Boot
617 does not mention a device tree in "help bootm", then use the
618 cuImage target and specify a device tree here. Otherwise, use
619 the uImage target and leave this field blank.
630 bool "Support for ISA-bus hardware"
631 depends on PPC_PREP || PPC_CHRP
634 Find out whether you have ISA slots on your motherboard. ISA is the
635 name of a bus system, i.e. the way the CPU talks to the other stuff
636 inside your box. If you have an Apple machine, say N here; if you
637 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
638 you have an embedded board, consult your board documentation.
644 config GENERIC_ISA_DMA
646 depends on PPC64 || POWER4 || 6xx && !CPM2
649 config PPC_INDIRECT_PCI
652 default y if 40x || 44x
655 config PPC_INDIRECT_PCI_BE
657 depends PPC_INDIRECT_PCI
673 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
678 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
679 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
680 || MPC7448HPC2 || PPC_PS3 || PPC_HOLLY
681 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
682 && !PPC_85xx && !PPC_86xx
683 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
684 default PCI_QSPAN if !4xx && !CPM2 && 8xx
686 Find out whether your system includes a PCI bus. PCI is the name of
687 a bus system, i.e. the way the CPU talks to the other stuff inside
688 your box. If you say Y here, the kernel will include drivers and
689 infrastructure code to support PCI bus devices.
697 depends on !4xx && !CPM2 && 8xx
700 Say Y here if you have a system based on a Motorola 8xx-series
701 embedded processor with a QSPAN PCI interface, otherwise say N.
705 depends on PCI && 8260
706 select PPC_INDIRECT_PCI
710 bool "Enable workaround for MPC826x erratum PCI 9"
711 depends on PCI_8260 && !ADS8272
715 prompt "IDMA channel for PCI 9 workaround"
718 config 8260_PCI9_IDMA1
721 config 8260_PCI9_IDMA2
724 config 8260_PCI9_IDMA3
727 config 8260_PCI9_IDMA4
732 source "drivers/pci/pcie/Kconfig"
734 source "drivers/pci/Kconfig"
736 source "drivers/pcmcia/Kconfig"
738 source "drivers/pci/hotplug/Kconfig"
742 menu "Advanced setup"
745 config ADVANCED_OPTIONS
746 bool "Prompt for advanced kernel configuration options"
748 This option will enable prompting for a variety of advanced kernel
749 configuration options. These options can cause the kernel to not
750 work if they are set incorrectly, but can be used to optimize certain
751 aspects of kernel memory management.
753 Unless you know what you are doing, say N here.
755 comment "Default settings for advanced configuration options are used"
756 depends on !ADVANCED_OPTIONS
758 config HIGHMEM_START_BOOL
759 bool "Set high memory pool address"
760 depends on ADVANCED_OPTIONS && HIGHMEM
762 This option allows you to set the base address of the kernel virtual
763 area used to map high memory pages. This can be useful in
764 optimizing the layout of kernel virtual memory.
766 Say N here unless you know what you are doing.
769 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
772 config LOWMEM_SIZE_BOOL
773 bool "Set maximum low memory"
774 depends on ADVANCED_OPTIONS
776 This option allows you to set the maximum amount of memory which
777 will be used as "low memory", that is, memory which the kernel can
778 access directly, without having to set up a kernel virtual mapping.
779 This can be useful in optimizing the layout of kernel virtual
782 Say N here unless you know what you are doing.
785 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
788 config KERNEL_START_BOOL
789 bool "Set custom kernel base address"
790 depends on ADVANCED_OPTIONS
792 This option allows you to set the kernel virtual address at which
793 the kernel will map low memory (the kernel image will be linked at
794 this address). This can be useful in optimizing the virtual memory
795 layout of the system.
797 Say N here unless you know what you are doing.
800 hex "Virtual address of kernel base" if KERNEL_START_BOOL
803 config TASK_SIZE_BOOL
804 bool "Set custom user task size"
805 depends on ADVANCED_OPTIONS
807 This option allows you to set the amount of virtual address space
808 allocated to user tasks. This can be useful in optimizing the
809 virtual memory layout of the system.
811 Say N here unless you know what you are doing.
814 hex "Size of user task space" if TASK_SIZE_BOOL
817 config CONSISTENT_START_BOOL
818 bool "Set custom consistent memory pool address"
819 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
821 This option allows you to set the base virtual address
822 of the consistent memory pool. This pool of virtual
823 memory is used to make consistent memory allocations.
825 config CONSISTENT_START
826 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
827 default "0xff100000" if NOT_COHERENT_CACHE
829 config CONSISTENT_SIZE_BOOL
830 bool "Set custom consistent memory pool size"
831 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
833 This option allows you to set the size of the
834 consistent memory pool. This pool of virtual memory
835 is used to make consistent memory allocations.
837 config CONSISTENT_SIZE
838 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
839 default "0x00200000" if NOT_COHERENT_CACHE
841 config BOOT_LOAD_BOOL
842 bool "Set the boot link/load address"
843 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
845 This option allows you to set the initial load address of the zImage
846 or zImage.initrd file. This can be useful if you are on a board
847 which has a small amount of memory.
849 Say N here unless you know what you are doing.
852 hex "Link/load address for booting" if BOOT_LOAD_BOOL
853 default "0x00400000" if 40x || 8xx || 8260
854 default "0x01000000" if 44x
858 bool "Pinned Kernel TLBs (860 ONLY)"
859 depends on ADVANCED_OPTIONS && 8xx
865 default "0xc000000000000000"
870 source "drivers/Kconfig"
874 # XXX source "arch/ppc/8xx_io/Kconfig"
876 # XXX source "arch/ppc/8260_io/Kconfig"
878 source "arch/powerpc/sysdev/qe_lib/Kconfig"
882 menu "Instrumentation Support"
883 depends on EXPERIMENTAL
885 source "arch/powerpc/oprofile/Kconfig"
888 bool "Kprobes (EXPERIMENTAL)"
889 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
891 Kprobes allows you to trap at almost any kernel address and
892 execute a callback function. register_kprobe() establishes
893 a probepoint and specifies the callback. Kprobes is useful
894 for kernel debugging, non-intrusive instrumentation and testing.
895 If in doubt, say "N".
898 source "arch/powerpc/Kconfig.debug"
900 source "security/Kconfig"
904 depends on COMPAT && KEYS
907 source "crypto/Kconfig"