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
121 # Powerpc uses the slab allocator to manage its ptes and the
122 # page structs of ptes are used for splitting the page table
123 # lock for configurations supporting more than SPLIT_PTLOCK_CPUS.
125 # In that special configuration the page structs of slabs are modified.
126 # This setting disables the selection of SLUB as a slab allocator.
128 config ARCH_USES_SLAB_PAGE_STRUCT
131 depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
133 config DEFAULT_UIMAGE
136 Used to allow a board to specify it wants a uImage built by default
139 menu "Processor support"
141 prompt "Processor Type"
146 bool "52xx/6xx/7xx/74xx"
150 There are four families of PowerPC chips supported. The more common
151 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
152 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
153 embedded versions (403 and 405) and the high end 64 bit Power
154 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
156 This option is the catch-all for 6xx types, including some of the
157 embedded versions. Unless there is see an option for the specific
158 chip family you are using, you want this option.
160 You do not want this if you are building a kernel for a 64 bit
161 IBM RS/6000 or an Apple G5, choose 6xx.
163 If unsure, select this option
165 Note that the kernel runs in 32-bit mode even on 64-bit chips.
168 bool "Freescale 82xx"
173 bool "Freescale 83xx"
178 select WANT_DEVICE_TREE
181 bool "Freescale 85xx"
185 select WANT_DEVICE_TREE
188 bool "Freescale 86xx"
195 The Freescale E600 SoCs have 74xx cores.
204 select PPC_DCR_NATIVE
208 select PPC_DCR_NATIVE
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 E200 || E500
280 depends on E200 || E500
285 depends on 44x || E500
287 default y if E500 && PHYS_64BIT
290 bool 'Large physical address support' if E500
291 depends on 44x || E500
292 select RESOURCES_64BIT
295 This option enables kernel support for larger than 32-bit physical
296 addresses. This features is not be available on all e500 cores.
298 If in doubt, say N here.
301 bool "AltiVec Support"
302 depends on CLASSIC32 || POWER4
304 This option enables kernel support for the Altivec extensions to the
305 PowerPC processor. The kernel currently supports saving and restoring
306 altivec registers, and turning on the 'altivec enable' bit so user
307 processes can execute altivec instructions.
309 This option is only usefully if you have a processor that supports
310 altivec (G4, otherwise known as 74xx series), but does not have
311 any affect on a non-altivec cpu (it does, however add code to the
314 If in doubt, say Y here.
318 depends on E200 || E500
321 This option enables kernel support for the Signal Processing
322 Extensions (SPE) to the PowerPC processor. The kernel currently
323 supports saving and restoring SPE registers, and turning on the
324 'spe enable' bit so user processes can execute SPE instructions.
326 This option is only useful if you have a processor that supports
327 SPE (e500, otherwise known as 85xx series), but does not have any
328 effect on a non-spe cpu (it does, however add code to the kernel).
330 If in doubt, say Y here.
334 depends on 6xx || POWER3 || POWER4 || PPC64
337 config PPC_STD_MMU_32
339 depends on PPC_STD_MMU && PPC32
341 config VIRT_CPU_ACCOUNTING
342 bool "Deterministic task and CPU time accounting"
346 Select this option to enable more accurate task and CPU time
347 accounting. This is done by reading a CPU counter on each
348 kernel entry and exit and on transitions within the kernel
349 between system, softirq and hardirq state, so there is a
350 small performance impact. This also enables accounting of
351 stolen time on logically-partitioned systems running on
352 IBM POWER5-based machines.
354 If in doubt, say Y here.
357 depends on PPC_STD_MMU
358 bool "Symmetric multi-processing support"
360 This enables support for systems with more than one CPU. If you have
361 a system with only one CPU, say N. If you have a system with more
362 than one CPU, say Y. Note that the kernel does not currently
363 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
364 since they have inadequate hardware support for multiprocessor
367 If you say N here, the kernel will run on single and multiprocessor
368 machines, but will use only one CPU of a multiprocessor machine. If
369 you say Y here, the kernel will run on single-processor machines.
370 On a single-processor machine, the kernel will run faster if you say
373 If you don't know what to do here, say N.
376 int "Maximum number of CPUs (2-128)"
379 default "32" if PPC64
382 config NOT_COHERENT_CACHE
384 depends on 4xx || 8xx || E200
388 source "init/Kconfig"
390 source "arch/powerpc/platforms/Kconfig"
392 menu "Kernel options"
395 bool "High memory support"
398 source kernel/Kconfig.hz
399 source kernel/Kconfig.preempt
400 source "fs/Kconfig.binfmt"
402 # We optimistically allocate largepages from the VM, so make the limit
403 # large enough (16MB). This badly named config option is actually
405 config FORCE_MAX_ZONEORDER
408 default "9" if PPC_64K_PAGES
411 config MATH_EMULATION
412 bool "Math emulation"
413 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
415 Some PowerPC chips designed for embedded applications do not have
416 a floating-point unit and therefore do not implement the
417 floating-point instructions in the PowerPC instruction set. If you
418 say Y here, the kernel will include code to emulate a floating-point
419 unit, which will allow programs that use floating-point
423 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
424 depends on EXPERIMENTAL && PPC64
427 Cause IO segments sent to a device for DMA to be merged virtually
428 by the IOMMU when they happen to have been allocated contiguously.
429 This doesn't add pressure to the IOMMU allocator. However, some
430 drivers don't support getting large merged segments coming back
431 from *_map_sg(). Say Y if you know the drivers you are using are
432 properly handling this case.
435 bool "Support for enabling/disabling CPUs"
436 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
438 Say Y here to be able to disable and re-enable individual
439 CPUs at runtime on SMP machines.
441 Say N if you are unsure.
443 config ARCH_ENABLE_MEMORY_HOTPLUG
447 bool "kexec system call (EXPERIMENTAL)"
448 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
450 kexec is a system call that implements the ability to shutdown your
451 current kernel, and to start another kernel. It is like a reboot
452 but it is independent of the system firmware. And like a reboot
453 you can start any kernel with it, not just Linux.
455 The name comes from the similarity to the exec system call.
457 It is an ongoing process to be certain the hardware in a machine
458 is properly shutdown, so do not be surprised if this code does not
459 initially work for you. It may help to enable device hotplugging
460 support. As of this writing the exact hardware interface is
461 strongly in flux, so no good recommendation can be made.
464 bool "Build a kdump crash kernel (EXPERIMENTAL)"
465 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
467 Build a kernel suitable for use as a kdump capture kernel.
468 The kernel will be linked at a different address than normal, and
469 so can only be used for Kdump.
471 Don't change this unless you know what you are doing.
474 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
475 default y if PPC_PREP
478 bool "Distribute interrupts on all CPUs by default"
479 depends on SMP && !MV64360
481 This option gives the kernel permission to distribute IRQs across
482 multiple CPUs. Saying N here will route all IRQs to the first
483 CPU. Generally saying Y is safe, although some problems have been
484 reported with SMP Power Macintoshes with this option enabled.
489 default y if SMP && PPC_PSERIES
494 depends on NEED_MULTIPLE_NODES
496 config ARCH_SELECT_MEMORY_MODEL
500 config ARCH_FLATMEM_ENABLE
502 depends on (PPC64 && !NUMA) || PPC32
504 config ARCH_SPARSEMEM_ENABLE
508 config ARCH_SPARSEMEM_DEFAULT
510 depends on (SMP && PPC_PSERIES) || PPC_PS3
512 config ARCH_POPULATES_NODE_MAP
517 config ARCH_MEMORY_PROBE
519 depends on MEMORY_HOTPLUG
521 # Some NUMA nodes have memory ranges that span
522 # other nodes. Even though a pfn is valid and
523 # between a node's start and end pfns, it may not
524 # reside on that node. See memmap_init_zone()
526 config NODES_SPAN_OTHER_NODES
528 depends on NEED_MULTIPLE_NODES
534 This option changes the kernel logical page size to 64k. On machines
535 without processor support for 64k pages, the kernel will simulate
536 them by loading each individual 4k page on demand transparently,
537 while on hardware with such support, it will be used to map
538 normal application pages.
541 bool "SMT (Hyperthreading) scheduler support"
542 depends on PPC64 && SMP
544 SMT scheduler support improves the CPU scheduler's decision making
545 when dealing with POWER5 cpus at a cost of slightly increased
546 overhead in some places. If unsure say N here.
548 config PROC_DEVICETREE
549 bool "Support for device tree in /proc"
552 This option adds a device-tree directory under /proc which contains
553 an image of the device tree that the kernel copies from Open
554 Firmware or other boot firmware. If unsure, say Y here.
557 bool "Default bootloader kernel arguments"
560 string "Initial kernel command string"
561 depends on CMDLINE_BOOL
562 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
564 On some platforms, there is currently no way for the boot loader to
565 pass arguments to the kernel. For these platforms, you can supply
566 some command-line options at build time by entering them here. In
567 most cases you will need to specify the root device here.
570 source kernel/power/Kconfig
574 bool "Enable seccomp to safely compute untrusted bytecode"
578 This kernel feature is useful for number crunching applications
579 that may need to compute untrusted bytecode during their
580 execution. By using pipes or other transports made available to
581 the process as file descriptors supporting the read/write
582 syscalls, it's possible to isolate those applications in
583 their own address space using seccomp. Once seccomp is
584 enabled via /proc/<pid>/seccomp, it cannot be disabled
585 and the task is only allowed to execute a few safe syscalls
586 defined by each seccomp mode.
588 If unsure, say Y. Only embedded should say N here.
590 config WANT_DEVICE_TREE
595 string "Static device tree source file"
596 depends on WANT_DEVICE_TREE
598 This specifies the device tree source (.dts) file to be
599 compiled and included when building the bootwrapper. If a
600 relative filename is given, then it will be relative to
601 arch/powerpc/boot/dts. If you are not using the bootwrapper,
602 or do not need to build a dts into the bootwrapper, this
605 For example, this is required when building a cuImage target
606 for an older U-Boot, which cannot pass a device tree itself.
607 Such a kernel will not work with a newer U-Boot that tries to
608 pass a device tree (unless you tell it not to). If your U-Boot
609 does not mention a device tree in "help bootm", then use the
610 cuImage target and specify a device tree here. Otherwise, use
611 the uImage target and leave this field blank.
622 bool "Support for ISA-bus hardware"
623 depends on PPC_PREP || PPC_CHRP
626 Find out whether you have ISA slots on your motherboard. ISA is the
627 name of a bus system, i.e. the way the CPU talks to the other stuff
628 inside your box. If you have an Apple machine, say N here; if you
629 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
630 you have an embedded board, consult your board documentation.
636 config GENERIC_ISA_DMA
638 depends on PPC64 || POWER4 || 6xx && !CPM2
641 config PPC_INDIRECT_PCI
644 default y if 40x || 44x
647 config PPC_INDIRECT_PCI_BE
649 depends PPC_INDIRECT_PCI
665 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
670 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
671 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
672 || MPC7448HPC2 || PPC_PS3
673 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
674 && !PPC_85xx && !PPC_86xx
675 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
676 default PCI_QSPAN if !4xx && !CPM2 && 8xx
678 Find out whether your system includes a PCI bus. PCI is the name of
679 a bus system, i.e. the way the CPU talks to the other stuff inside
680 your box. If you say Y here, the kernel will include drivers and
681 infrastructure code to support PCI bus devices.
689 depends on !4xx && !CPM2 && 8xx
692 Say Y here if you have a system based on a Motorola 8xx-series
693 embedded processor with a QSPAN PCI interface, otherwise say N.
697 depends on PCI && 8260
698 select PPC_INDIRECT_PCI
702 bool "Enable workaround for MPC826x erratum PCI 9"
703 depends on PCI_8260 && !ADS8272
707 prompt "IDMA channel for PCI 9 workaround"
710 config 8260_PCI9_IDMA1
713 config 8260_PCI9_IDMA2
716 config 8260_PCI9_IDMA3
719 config 8260_PCI9_IDMA4
724 source "drivers/pci/pcie/Kconfig"
726 source "drivers/pci/Kconfig"
728 source "drivers/pcmcia/Kconfig"
730 source "drivers/pci/hotplug/Kconfig"
734 menu "Advanced setup"
737 config ADVANCED_OPTIONS
738 bool "Prompt for advanced kernel configuration options"
740 This option will enable prompting for a variety of advanced kernel
741 configuration options. These options can cause the kernel to not
742 work if they are set incorrectly, but can be used to optimize certain
743 aspects of kernel memory management.
745 Unless you know what you are doing, say N here.
747 comment "Default settings for advanced configuration options are used"
748 depends on !ADVANCED_OPTIONS
750 config HIGHMEM_START_BOOL
751 bool "Set high memory pool address"
752 depends on ADVANCED_OPTIONS && HIGHMEM
754 This option allows you to set the base address of the kernel virtual
755 area used to map high memory pages. This can be useful in
756 optimizing the layout of kernel virtual memory.
758 Say N here unless you know what you are doing.
761 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
764 config LOWMEM_SIZE_BOOL
765 bool "Set maximum low memory"
766 depends on ADVANCED_OPTIONS
768 This option allows you to set the maximum amount of memory which
769 will be used as "low memory", that is, memory which the kernel can
770 access directly, without having to set up a kernel virtual mapping.
771 This can be useful in optimizing the layout of kernel virtual
774 Say N here unless you know what you are doing.
777 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
780 config KERNEL_START_BOOL
781 bool "Set custom kernel base address"
782 depends on ADVANCED_OPTIONS
784 This option allows you to set the kernel virtual address at which
785 the kernel will map low memory (the kernel image will be linked at
786 this address). This can be useful in optimizing the virtual memory
787 layout of the system.
789 Say N here unless you know what you are doing.
792 hex "Virtual address of kernel base" if KERNEL_START_BOOL
795 config TASK_SIZE_BOOL
796 bool "Set custom user task size"
797 depends on ADVANCED_OPTIONS
799 This option allows you to set the amount of virtual address space
800 allocated to user tasks. This can be useful in optimizing the
801 virtual memory layout of the system.
803 Say N here unless you know what you are doing.
806 hex "Size of user task space" if TASK_SIZE_BOOL
809 config CONSISTENT_START_BOOL
810 bool "Set custom consistent memory pool address"
811 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
813 This option allows you to set the base virtual address
814 of the consistent memory pool. This pool of virtual
815 memory is used to make consistent memory allocations.
817 config CONSISTENT_START
818 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
819 default "0xff100000" if NOT_COHERENT_CACHE
821 config CONSISTENT_SIZE_BOOL
822 bool "Set custom consistent memory pool size"
823 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
825 This option allows you to set the size of the
826 consistent memory pool. This pool of virtual memory
827 is used to make consistent memory allocations.
829 config CONSISTENT_SIZE
830 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
831 default "0x00200000" if NOT_COHERENT_CACHE
833 config BOOT_LOAD_BOOL
834 bool "Set the boot link/load address"
835 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
837 This option allows you to set the initial load address of the zImage
838 or zImage.initrd file. This can be useful if you are on a board
839 which has a small amount of memory.
841 Say N here unless you know what you are doing.
844 hex "Link/load address for booting" if BOOT_LOAD_BOOL
845 default "0x00400000" if 40x || 8xx || 8260
846 default "0x01000000" if 44x
850 bool "Pinned Kernel TLBs (860 ONLY)"
851 depends on ADVANCED_OPTIONS && 8xx
857 default "0xc000000000000000"
862 source "drivers/Kconfig"
866 # XXX source "arch/ppc/8xx_io/Kconfig"
868 # XXX source "arch/ppc/8260_io/Kconfig"
870 source "arch/powerpc/sysdev/qe_lib/Kconfig"
874 menu "Instrumentation Support"
875 depends on EXPERIMENTAL
877 source "arch/powerpc/oprofile/Kconfig"
880 bool "Kprobes (EXPERIMENTAL)"
881 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
883 Kprobes allows you to trap at almost any kernel address and
884 execute a callback function. register_kprobe() establishes
885 a probepoint and specifies the callback. Kprobes is useful
886 for kernel debugging, non-intrusive instrumentation and testing.
887 If in doubt, say "N".
890 source "arch/powerpc/Kconfig.debug"
892 source "security/Kconfig"
896 depends on COMPAT && KEYS
899 source "crypto/Kconfig"