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
129 menu "Processor support"
131 prompt "Processor Type"
136 bool "52xx/6xx/7xx/74xx"
140 There are four families of PowerPC chips supported. The more common
141 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
142 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
143 embedded versions (403 and 405) and the high end 64 bit Power
144 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
146 This option is the catch-all for 6xx types, including some of the
147 embedded versions. Unless there is see an option for the specific
148 chip family you are using, you want this option.
150 You do not want this if you are building a kernel for a 64 bit
151 IBM RS/6000 or an Apple G5, choose 6xx.
153 If unsure, select this option
155 Note that the kernel runs in 32-bit mode even on 64-bit chips.
158 bool "Freescale 82xx"
163 bool "Freescale 83xx"
168 select WANT_DEVICE_TREE
171 bool "Freescale 85xx"
175 select WANT_DEVICE_TREE
178 bool "Freescale 86xx"
185 The Freescale E600 SoCs have 74xx cores.
194 select PPC_DCR_NATIVE
198 select PPC_DCR_NATIVE
201 bool "Freescale e200"
206 bool "Optimize for POWER4"
210 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
211 The resulting binary will not work on POWER3 or RS64 processors
212 when compiled with binutils 2.15 or later.
217 default y if !POWER4_ONLY
226 # this is temp to handle compat with arch=ppc
230 # this is temp to handle compat with arch=ppc
234 # this is temp to handle compat with arch=ppc
245 config PPC_DCR_NATIVE
255 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
258 config PPC_OF_PLATFORM_PCI
260 depends on PPC64 # not supported on 32 bits yet
265 depends on E200 || E500
270 depends on E200 || E500
275 depends on 44x || E500
277 default y if E500 && PHYS_64BIT
280 bool 'Large physical address support' if E500
281 depends on 44x || E500
282 select RESOURCES_64BIT
285 This option enables kernel support for larger than 32-bit physical
286 addresses. This features is not be available on all e500 cores.
288 If in doubt, say N here.
291 bool "AltiVec Support"
292 depends on CLASSIC32 || POWER4
294 This option enables kernel support for the Altivec extensions to the
295 PowerPC processor. The kernel currently supports saving and restoring
296 altivec registers, and turning on the 'altivec enable' bit so user
297 processes can execute altivec instructions.
299 This option is only usefully if you have a processor that supports
300 altivec (G4, otherwise known as 74xx series), but does not have
301 any affect on a non-altivec cpu (it does, however add code to the
304 If in doubt, say Y here.
308 depends on E200 || E500
311 This option enables kernel support for the Signal Processing
312 Extensions (SPE) to the PowerPC processor. The kernel currently
313 supports saving and restoring SPE registers, and turning on the
314 'spe enable' bit so user processes can execute SPE instructions.
316 This option is only useful if you have a processor that supports
317 SPE (e500, otherwise known as 85xx series), but does not have any
318 effect on a non-spe cpu (it does, however add code to the kernel).
320 If in doubt, say Y here.
324 depends on 6xx || POWER3 || POWER4 || PPC64
327 config PPC_STD_MMU_32
329 depends on PPC_STD_MMU && PPC32
331 config VIRT_CPU_ACCOUNTING
332 bool "Deterministic task and CPU time accounting"
336 Select this option to enable more accurate task and CPU time
337 accounting. This is done by reading a CPU counter on each
338 kernel entry and exit and on transitions within the kernel
339 between system, softirq and hardirq state, so there is a
340 small performance impact. This also enables accounting of
341 stolen time on logically-partitioned systems running on
342 IBM POWER5-based machines.
344 If in doubt, say Y here.
347 depends on PPC_STD_MMU
348 bool "Symmetric multi-processing support"
350 This enables support for systems with more than one CPU. If you have
351 a system with only one CPU, say N. If you have a system with more
352 than one CPU, say Y. Note that the kernel does not currently
353 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
354 since they have inadequate hardware support for multiprocessor
357 If you say N here, the kernel will run on single and multiprocessor
358 machines, but will use only one CPU of a multiprocessor machine. If
359 you say Y here, the kernel will run on single-processor machines.
360 On a single-processor machine, the kernel will run faster if you say
363 If you don't know what to do here, say N.
366 int "Maximum number of CPUs (2-128)"
369 default "32" if PPC64
372 config NOT_COHERENT_CACHE
374 depends on 4xx || 8xx || E200
378 source "init/Kconfig"
380 source "arch/powerpc/platforms/Kconfig"
382 menu "Kernel options"
385 bool "High memory support"
388 source kernel/Kconfig.hz
389 source kernel/Kconfig.preempt
390 source "fs/Kconfig.binfmt"
392 # We optimistically allocate largepages from the VM, so make the limit
393 # large enough (16MB). This badly named config option is actually
395 config FORCE_MAX_ZONEORDER
398 default "9" if PPC_64K_PAGES
401 config MATH_EMULATION
402 bool "Math emulation"
403 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
405 Some PowerPC chips designed for embedded applications do not have
406 a floating-point unit and therefore do not implement the
407 floating-point instructions in the PowerPC instruction set. If you
408 say Y here, the kernel will include code to emulate a floating-point
409 unit, which will allow programs that use floating-point
413 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
414 depends on EXPERIMENTAL && PPC64
417 Cause IO segments sent to a device for DMA to be merged virtually
418 by the IOMMU when they happen to have been allocated contiguously.
419 This doesn't add pressure to the IOMMU allocator. However, some
420 drivers don't support getting large merged segments coming back
421 from *_map_sg(). Say Y if you know the drivers you are using are
422 properly handling this case.
425 bool "Support for enabling/disabling CPUs"
426 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
428 Say Y here to be able to disable and re-enable individual
429 CPUs at runtime on SMP machines.
431 Say N if you are unsure.
433 config ARCH_ENABLE_MEMORY_HOTPLUG
437 bool "kexec system call (EXPERIMENTAL)"
438 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
440 kexec is a system call that implements the ability to shutdown your
441 current kernel, and to start another kernel. It is like a reboot
442 but it is independent of the system firmware. And like a reboot
443 you can start any kernel with it, not just Linux.
445 The name comes from the similarity to the exec system call.
447 It is an ongoing process to be certain the hardware in a machine
448 is properly shutdown, so do not be surprised if this code does not
449 initially work for you. It may help to enable device hotplugging
450 support. As of this writing the exact hardware interface is
451 strongly in flux, so no good recommendation can be made.
454 bool "Build a kdump crash kernel (EXPERIMENTAL)"
455 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
457 Build a kernel suitable for use as a kdump capture kernel.
458 The kernel will be linked at a different address than normal, and
459 so can only be used for Kdump.
461 Don't change this unless you know what you are doing.
464 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
465 default y if PPC_PREP
468 bool "Distribute interrupts on all CPUs by default"
469 depends on SMP && !MV64360
471 This option gives the kernel permission to distribute IRQs across
472 multiple CPUs. Saying N here will route all IRQs to the first
473 CPU. Generally saying Y is safe, although some problems have been
474 reported with SMP Power Macintoshes with this option enabled.
479 default y if SMP && PPC_PSERIES
484 depends on NEED_MULTIPLE_NODES
486 config ARCH_SELECT_MEMORY_MODEL
490 config ARCH_FLATMEM_ENABLE
492 depends on (PPC64 && !NUMA) || PPC32
494 config ARCH_SPARSEMEM_ENABLE
498 config ARCH_SPARSEMEM_DEFAULT
500 depends on (SMP && PPC_PSERIES) || PPC_PS3
502 config ARCH_POPULATES_NODE_MAP
507 config ARCH_MEMORY_PROBE
509 depends on MEMORY_HOTPLUG
511 # Some NUMA nodes have memory ranges that span
512 # other nodes. Even though a pfn is valid and
513 # between a node's start and end pfns, it may not
514 # reside on that node. See memmap_init_zone()
516 config NODES_SPAN_OTHER_NODES
518 depends on NEED_MULTIPLE_NODES
524 This option changes the kernel logical page size to 64k. On machines
525 without processor support for 64k pages, the kernel will simulate
526 them by loading each individual 4k page on demand transparently,
527 while on hardware with such support, it will be used to map
528 normal application pages.
531 bool "SMT (Hyperthreading) scheduler support"
532 depends on PPC64 && SMP
534 SMT scheduler support improves the CPU scheduler's decision making
535 when dealing with POWER5 cpus at a cost of slightly increased
536 overhead in some places. If unsure say N here.
538 config PROC_DEVICETREE
539 bool "Support for device tree in /proc"
542 This option adds a device-tree directory under /proc which contains
543 an image of the device tree that the kernel copies from Open
544 Firmware or other boot firmware. If unsure, say Y here.
547 bool "Default bootloader kernel arguments"
550 string "Initial kernel command string"
551 depends on CMDLINE_BOOL
552 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
554 On some platforms, there is currently no way for the boot loader to
555 pass arguments to the kernel. For these platforms, you can supply
556 some command-line options at build time by entering them here. In
557 most cases you will need to specify the root device here.
560 source kernel/power/Kconfig
564 bool "Enable seccomp to safely compute untrusted bytecode"
568 This kernel feature is useful for number crunching applications
569 that may need to compute untrusted bytecode during their
570 execution. By using pipes or other transports made available to
571 the process as file descriptors supporting the read/write
572 syscalls, it's possible to isolate those applications in
573 their own address space using seccomp. Once seccomp is
574 enabled via /proc/<pid>/seccomp, it cannot be disabled
575 and the task is only allowed to execute a few safe syscalls
576 defined by each seccomp mode.
578 If unsure, say Y. Only embedded should say N here.
580 config WANT_DEVICE_TREE
585 string "Static device tree source file"
586 depends on WANT_DEVICE_TREE
588 This specifies the device tree source (.dts) file to be
589 compiled and included when building the bootwrapper. If a
590 relative filename is given, then it will be relative to
591 arch/powerpc/boot/dts. If you are not using the bootwrapper,
592 or do not need to build a dts into the bootwrapper, this
595 For example, this is required when building a cuImage target
596 for an older U-Boot, which cannot pass a device tree itself.
597 Such a kernel will not work with a newer U-Boot that tries to
598 pass a device tree (unless you tell it not to). If your U-Boot
599 does not mention a device tree in "help bootm", then use the
600 cuImage target and specify a device tree here. Otherwise, use
601 the uImage target and leave this field blank.
612 bool "Support for ISA-bus hardware"
613 depends on PPC_PREP || PPC_CHRP
616 Find out whether you have ISA slots on your motherboard. ISA is the
617 name of a bus system, i.e. the way the CPU talks to the other stuff
618 inside your box. If you have an Apple machine, say N here; if you
619 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
620 you have an embedded board, consult your board documentation.
626 config GENERIC_ISA_DMA
628 depends on PPC64 || POWER4 || 6xx && !CPM2
631 config PPC_INDIRECT_PCI
634 default y if 40x || 44x
637 config PPC_INDIRECT_PCI_BE
639 depends PPC_INDIRECT_PCI
655 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
660 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
661 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
662 || MPC7448HPC2 || PPC_PS3
663 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
664 && !PPC_85xx && !PPC_86xx
665 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
666 default PCI_QSPAN if !4xx && !CPM2 && 8xx
668 Find out whether your system includes a PCI bus. PCI is the name of
669 a bus system, i.e. the way the CPU talks to the other stuff inside
670 your box. If you say Y here, the kernel will include drivers and
671 infrastructure code to support PCI bus devices.
679 depends on !4xx && !CPM2 && 8xx
682 Say Y here if you have a system based on a Motorola 8xx-series
683 embedded processor with a QSPAN PCI interface, otherwise say N.
687 depends on PCI && 8260
688 select PPC_INDIRECT_PCI
692 bool "Enable workaround for MPC826x erratum PCI 9"
693 depends on PCI_8260 && !ADS8272
697 prompt "IDMA channel for PCI 9 workaround"
700 config 8260_PCI9_IDMA1
703 config 8260_PCI9_IDMA2
706 config 8260_PCI9_IDMA3
709 config 8260_PCI9_IDMA4
714 source "drivers/pci/pcie/Kconfig"
716 source "drivers/pci/Kconfig"
718 source "drivers/pcmcia/Kconfig"
720 source "drivers/pci/hotplug/Kconfig"
724 menu "Advanced setup"
727 config ADVANCED_OPTIONS
728 bool "Prompt for advanced kernel configuration options"
730 This option will enable prompting for a variety of advanced kernel
731 configuration options. These options can cause the kernel to not
732 work if they are set incorrectly, but can be used to optimize certain
733 aspects of kernel memory management.
735 Unless you know what you are doing, say N here.
737 comment "Default settings for advanced configuration options are used"
738 depends on !ADVANCED_OPTIONS
740 config HIGHMEM_START_BOOL
741 bool "Set high memory pool address"
742 depends on ADVANCED_OPTIONS && HIGHMEM
744 This option allows you to set the base address of the kernel virtual
745 area used to map high memory pages. This can be useful in
746 optimizing the layout of kernel virtual memory.
748 Say N here unless you know what you are doing.
751 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
754 config LOWMEM_SIZE_BOOL
755 bool "Set maximum low memory"
756 depends on ADVANCED_OPTIONS
758 This option allows you to set the maximum amount of memory which
759 will be used as "low memory", that is, memory which the kernel can
760 access directly, without having to set up a kernel virtual mapping.
761 This can be useful in optimizing the layout of kernel virtual
764 Say N here unless you know what you are doing.
767 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
770 config KERNEL_START_BOOL
771 bool "Set custom kernel base address"
772 depends on ADVANCED_OPTIONS
774 This option allows you to set the kernel virtual address at which
775 the kernel will map low memory (the kernel image will be linked at
776 this address). This can be useful in optimizing the virtual memory
777 layout of the system.
779 Say N here unless you know what you are doing.
782 hex "Virtual address of kernel base" if KERNEL_START_BOOL
785 config TASK_SIZE_BOOL
786 bool "Set custom user task size"
787 depends on ADVANCED_OPTIONS
789 This option allows you to set the amount of virtual address space
790 allocated to user tasks. This can be useful in optimizing the
791 virtual memory layout of the system.
793 Say N here unless you know what you are doing.
796 hex "Size of user task space" if TASK_SIZE_BOOL
799 config CONSISTENT_START_BOOL
800 bool "Set custom consistent memory pool address"
801 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
803 This option allows you to set the base virtual address
804 of the consistent memory pool. This pool of virtual
805 memory is used to make consistent memory allocations.
807 config CONSISTENT_START
808 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
809 default "0xff100000" if NOT_COHERENT_CACHE
811 config CONSISTENT_SIZE_BOOL
812 bool "Set custom consistent memory pool size"
813 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
815 This option allows you to set the size of the
816 consistent memory pool. This pool of virtual memory
817 is used to make consistent memory allocations.
819 config CONSISTENT_SIZE
820 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
821 default "0x00200000" if NOT_COHERENT_CACHE
823 config BOOT_LOAD_BOOL
824 bool "Set the boot link/load address"
825 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
827 This option allows you to set the initial load address of the zImage
828 or zImage.initrd file. This can be useful if you are on a board
829 which has a small amount of memory.
831 Say N here unless you know what you are doing.
834 hex "Link/load address for booting" if BOOT_LOAD_BOOL
835 default "0x00400000" if 40x || 8xx || 8260
836 default "0x01000000" if 44x
840 bool "Pinned Kernel TLBs (860 ONLY)"
841 depends on ADVANCED_OPTIONS && 8xx
847 default "0xc000000000000000"
852 source "drivers/Kconfig"
856 # XXX source "arch/ppc/8xx_io/Kconfig"
858 # XXX source "arch/ppc/8260_io/Kconfig"
860 source "arch/powerpc/sysdev/qe_lib/Kconfig"
864 menu "Instrumentation Support"
865 depends on EXPERIMENTAL
867 source "arch/powerpc/oprofile/Kconfig"
870 bool "Kprobes (EXPERIMENTAL)"
871 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
873 Kprobes allows you to trap at almost any kernel address and
874 execute a callback function. register_kprobe() establishes
875 a probepoint and specifies the callback. Kprobes is useful
876 for kernel debugging, non-intrusive instrumentation and testing.
877 If in doubt, say "N".
880 source "arch/powerpc/Kconfig.debug"
882 source "security/Kconfig"
886 depends on COMPAT && KEYS
889 source "crypto/Kconfig"