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 DEFAULT_UIMAGE
123 Used to allow a board to specify it wants a uImage built by default
126 menu "Processor support"
128 prompt "Processor Type"
133 bool "52xx/6xx/7xx/74xx"
137 There are four families of PowerPC chips supported. The more common
138 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
139 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
140 embedded versions (403 and 405) and the high end 64 bit Power
141 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
143 This option is the catch-all for 6xx types, including some of the
144 embedded versions. Unless there is see an option for the specific
145 chip family you are using, you want this option.
147 You do not want this if you are building a kernel for a 64 bit
148 IBM RS/6000 or an Apple G5, choose 6xx.
150 If unsure, select this option
152 Note that the kernel runs in 32-bit mode even on 64-bit chips.
155 bool "Freescale 82xx"
160 bool "Freescale 83xx"
165 select WANT_DEVICE_TREE
168 bool "Freescale 85xx"
174 bool "Freescale 86xx"
181 The Freescale E600 SoCs have 74xx cores.
190 select PPC_DCR_NATIVE
194 select PPC_DCR_NATIVE
197 bool "Freescale e200"
202 bool "Optimize for POWER4"
206 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
207 The resulting binary will not work on POWER3 or RS64 processors
208 when compiled with binutils 2.15 or later.
213 default y if !POWER4_ONLY
222 # this is temp to handle compat with arch=ppc
226 # this is temp to handle compat with arch=ppc
230 # this is temp to handle compat with arch=ppc
241 config PPC_DCR_NATIVE
251 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
254 config PPC_OF_PLATFORM_PCI
256 depends on PPC64 # not supported on 32 bits yet
261 depends on E200 || E500
266 depends on E200 || E500
271 depends on 44x || E500
273 default y if E500 && PHYS_64BIT
276 bool 'Large physical address support' if E500
277 depends on 44x || E500
278 select RESOURCES_64BIT
281 This option enables kernel support for larger than 32-bit physical
282 addresses. This features is not be available on all e500 cores.
284 If in doubt, say N here.
287 bool "AltiVec Support"
288 depends on CLASSIC32 || POWER4
290 This option enables kernel support for the Altivec extensions to the
291 PowerPC processor. The kernel currently supports saving and restoring
292 altivec registers, and turning on the 'altivec enable' bit so user
293 processes can execute altivec instructions.
295 This option is only usefully if you have a processor that supports
296 altivec (G4, otherwise known as 74xx series), but does not have
297 any affect on a non-altivec cpu (it does, however add code to the
300 If in doubt, say Y here.
304 depends on E200 || E500
307 This option enables kernel support for the Signal Processing
308 Extensions (SPE) to the PowerPC processor. The kernel currently
309 supports saving and restoring SPE registers, and turning on the
310 'spe enable' bit so user processes can execute SPE instructions.
312 This option is only useful if you have a processor that supports
313 SPE (e500, otherwise known as 85xx series), but does not have any
314 effect on a non-spe cpu (it does, however add code to the kernel).
316 If in doubt, say Y here.
320 depends on 6xx || POWER3 || POWER4 || PPC64
323 config PPC_STD_MMU_32
325 depends on PPC_STD_MMU && PPC32
327 config VIRT_CPU_ACCOUNTING
328 bool "Deterministic task and CPU time accounting"
332 Select this option to enable more accurate task and CPU time
333 accounting. This is done by reading a CPU counter on each
334 kernel entry and exit and on transitions within the kernel
335 between system, softirq and hardirq state, so there is a
336 small performance impact. This also enables accounting of
337 stolen time on logically-partitioned systems running on
338 IBM POWER5-based machines.
340 If in doubt, say Y here.
343 depends on PPC_STD_MMU
344 bool "Symmetric multi-processing support"
346 This enables support for systems with more than one CPU. If you have
347 a system with only one CPU, say N. If you have a system with more
348 than one CPU, say Y. Note that the kernel does not currently
349 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
350 since they have inadequate hardware support for multiprocessor
353 If you say N here, the kernel will run on single and multiprocessor
354 machines, but will use only one CPU of a multiprocessor machine. If
355 you say Y here, the kernel will run on single-processor machines.
356 On a single-processor machine, the kernel will run faster if you say
359 If you don't know what to do here, say N.
362 int "Maximum number of CPUs (2-128)"
365 default "32" if PPC64
368 config NOT_COHERENT_CACHE
370 depends on 4xx || 8xx || E200
374 source "init/Kconfig"
376 source "arch/powerpc/platforms/Kconfig"
378 menu "Kernel options"
381 bool "High memory support"
384 source kernel/Kconfig.hz
385 source kernel/Kconfig.preempt
386 source "fs/Kconfig.binfmt"
388 # We optimistically allocate largepages from the VM, so make the limit
389 # large enough (16MB). This badly named config option is actually
391 config FORCE_MAX_ZONEORDER
394 default "9" if PPC_64K_PAGES
397 config MATH_EMULATION
398 bool "Math emulation"
399 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
401 Some PowerPC chips designed for embedded applications do not have
402 a floating-point unit and therefore do not implement the
403 floating-point instructions in the PowerPC instruction set. If you
404 say Y here, the kernel will include code to emulate a floating-point
405 unit, which will allow programs that use floating-point
409 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
410 depends on EXPERIMENTAL && PPC64
413 Cause IO segments sent to a device for DMA to be merged virtually
414 by the IOMMU when they happen to have been allocated contiguously.
415 This doesn't add pressure to the IOMMU allocator. However, some
416 drivers don't support getting large merged segments coming back
417 from *_map_sg(). Say Y if you know the drivers you are using are
418 properly handling this case.
421 bool "Support for enabling/disabling CPUs"
422 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
424 Say Y here to be able to disable and re-enable individual
425 CPUs at runtime on SMP machines.
427 Say N if you are unsure.
429 config ARCH_ENABLE_MEMORY_HOTPLUG
433 bool "kexec system call (EXPERIMENTAL)"
434 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
436 kexec is a system call that implements the ability to shutdown your
437 current kernel, and to start another kernel. It is like a reboot
438 but it is independent of the system firmware. And like a reboot
439 you can start any kernel with it, not just Linux.
441 The name comes from the similarity to the exec system call.
443 It is an ongoing process to be certain the hardware in a machine
444 is properly shutdown, so do not be surprised if this code does not
445 initially work for you. It may help to enable device hotplugging
446 support. As of this writing the exact hardware interface is
447 strongly in flux, so no good recommendation can be made.
450 bool "Build a kdump crash kernel (EXPERIMENTAL)"
451 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
453 Build a kernel suitable for use as a kdump capture kernel.
454 The kernel will be linked at a different address than normal, and
455 so can only be used for Kdump.
457 Don't change this unless you know what you are doing.
460 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
461 default y if PPC_PREP
464 bool "Distribute interrupts on all CPUs by default"
465 depends on SMP && !MV64360
467 This option gives the kernel permission to distribute IRQs across
468 multiple CPUs. Saying N here will route all IRQs to the first
469 CPU. Generally saying Y is safe, although some problems have been
470 reported with SMP Power Macintoshes with this option enabled.
475 default y if SMP && PPC_PSERIES
480 depends on NEED_MULTIPLE_NODES
482 config ARCH_SELECT_MEMORY_MODEL
486 config ARCH_FLATMEM_ENABLE
488 depends on (PPC64 && !NUMA) || PPC32
490 config ARCH_SPARSEMEM_ENABLE
494 config ARCH_SPARSEMEM_DEFAULT
496 depends on (SMP && PPC_PSERIES) || PPC_PS3
498 config ARCH_POPULATES_NODE_MAP
503 config ARCH_MEMORY_PROBE
505 depends on MEMORY_HOTPLUG
507 # Some NUMA nodes have memory ranges that span
508 # other nodes. Even though a pfn is valid and
509 # between a node's start and end pfns, it may not
510 # reside on that node. See memmap_init_zone()
512 config NODES_SPAN_OTHER_NODES
514 depends on NEED_MULTIPLE_NODES
520 This option changes the kernel logical page size to 64k. On machines
521 without processor support for 64k pages, the kernel will simulate
522 them by loading each individual 4k page on demand transparently,
523 while on hardware with such support, it will be used to map
524 normal application pages.
527 bool "SMT (Hyperthreading) scheduler support"
528 depends on PPC64 && SMP
530 SMT scheduler support improves the CPU scheduler's decision making
531 when dealing with POWER5 cpus at a cost of slightly increased
532 overhead in some places. If unsure say N here.
534 config PROC_DEVICETREE
535 bool "Support for device tree in /proc"
538 This option adds a device-tree directory under /proc which contains
539 an image of the device tree that the kernel copies from Open
540 Firmware or other boot firmware. If unsure, say Y here.
543 bool "Default bootloader kernel arguments"
546 string "Initial kernel command string"
547 depends on CMDLINE_BOOL
548 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
550 On some platforms, there is currently no way for the boot loader to
551 pass arguments to the kernel. For these platforms, you can supply
552 some command-line options at build time by entering them here. In
553 most cases you will need to specify the root device here.
556 source kernel/power/Kconfig
560 bool "Enable seccomp to safely compute untrusted bytecode"
564 This kernel feature is useful for number crunching applications
565 that may need to compute untrusted bytecode during their
566 execution. By using pipes or other transports made available to
567 the process as file descriptors supporting the read/write
568 syscalls, it's possible to isolate those applications in
569 their own address space using seccomp. Once seccomp is
570 enabled via /proc/<pid>/seccomp, it cannot be disabled
571 and the task is only allowed to execute a few safe syscalls
572 defined by each seccomp mode.
574 If unsure, say Y. Only embedded should say N here.
576 config WANT_DEVICE_TREE
581 string "Static device tree source file"
582 depends on WANT_DEVICE_TREE
584 This specifies the device tree source (.dts) file to be
585 compiled and included when building the bootwrapper. If a
586 relative filename is given, then it will be relative to
587 arch/powerpc/boot/dts. If you are not using the bootwrapper,
588 or do not need to build a dts into the bootwrapper, this
591 For example, this is required when building a cuImage target
592 for an older U-Boot, which cannot pass a device tree itself.
593 Such a kernel will not work with a newer U-Boot that tries to
594 pass a device tree (unless you tell it not to). If your U-Boot
595 does not mention a device tree in "help bootm", then use the
596 cuImage target and specify a device tree here. Otherwise, use
597 the uImage target and leave this field blank.
608 bool "Support for ISA-bus hardware"
609 depends on PPC_PREP || PPC_CHRP
612 Find out whether you have ISA slots on your motherboard. ISA is the
613 name of a bus system, i.e. the way the CPU talks to the other stuff
614 inside your box. If you have an Apple machine, say N here; if you
615 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
616 you have an embedded board, consult your board documentation.
622 config GENERIC_ISA_DMA
624 depends on PPC64 || POWER4 || 6xx && !CPM2
627 config PPC_INDIRECT_PCI
630 default y if 40x || 44x
633 config PPC_INDIRECT_PCI_BE
635 depends PPC_INDIRECT_PCI
651 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
656 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
657 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
658 || MPC7448HPC2 || PPC_PS3
659 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
660 && !PPC_85xx && !PPC_86xx
661 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
662 default PCI_QSPAN if !4xx && !CPM2 && 8xx
664 Find out whether your system includes a PCI bus. PCI is the name of
665 a bus system, i.e. the way the CPU talks to the other stuff inside
666 your box. If you say Y here, the kernel will include drivers and
667 infrastructure code to support PCI bus devices.
675 depends on !4xx && !CPM2 && 8xx
678 Say Y here if you have a system based on a Motorola 8xx-series
679 embedded processor with a QSPAN PCI interface, otherwise say N.
683 depends on PCI && 8260
684 select PPC_INDIRECT_PCI
688 bool "Enable workaround for MPC826x erratum PCI 9"
689 depends on PCI_8260 && !ADS8272
693 prompt "IDMA channel for PCI 9 workaround"
696 config 8260_PCI9_IDMA1
699 config 8260_PCI9_IDMA2
702 config 8260_PCI9_IDMA3
705 config 8260_PCI9_IDMA4
710 source "drivers/pci/pcie/Kconfig"
712 source "drivers/pci/Kconfig"
714 source "drivers/pcmcia/Kconfig"
716 source "drivers/pci/hotplug/Kconfig"
720 menu "Advanced setup"
723 config ADVANCED_OPTIONS
724 bool "Prompt for advanced kernel configuration options"
726 This option will enable prompting for a variety of advanced kernel
727 configuration options. These options can cause the kernel to not
728 work if they are set incorrectly, but can be used to optimize certain
729 aspects of kernel memory management.
731 Unless you know what you are doing, say N here.
733 comment "Default settings for advanced configuration options are used"
734 depends on !ADVANCED_OPTIONS
736 config HIGHMEM_START_BOOL
737 bool "Set high memory pool address"
738 depends on ADVANCED_OPTIONS && HIGHMEM
740 This option allows you to set the base address of the kernel virtual
741 area used to map high memory pages. This can be useful in
742 optimizing the layout of kernel virtual memory.
744 Say N here unless you know what you are doing.
747 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
750 config LOWMEM_SIZE_BOOL
751 bool "Set maximum low memory"
752 depends on ADVANCED_OPTIONS
754 This option allows you to set the maximum amount of memory which
755 will be used as "low memory", that is, memory which the kernel can
756 access directly, without having to set up a kernel virtual mapping.
757 This can be useful in optimizing the layout of kernel virtual
760 Say N here unless you know what you are doing.
763 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
766 config KERNEL_START_BOOL
767 bool "Set custom kernel base address"
768 depends on ADVANCED_OPTIONS
770 This option allows you to set the kernel virtual address at which
771 the kernel will map low memory (the kernel image will be linked at
772 this address). This can be useful in optimizing the virtual memory
773 layout of the system.
775 Say N here unless you know what you are doing.
778 hex "Virtual address of kernel base" if KERNEL_START_BOOL
781 config TASK_SIZE_BOOL
782 bool "Set custom user task size"
783 depends on ADVANCED_OPTIONS
785 This option allows you to set the amount of virtual address space
786 allocated to user tasks. This can be useful in optimizing the
787 virtual memory layout of the system.
789 Say N here unless you know what you are doing.
792 hex "Size of user task space" if TASK_SIZE_BOOL
795 config CONSISTENT_START_BOOL
796 bool "Set custom consistent memory pool address"
797 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
799 This option allows you to set the base virtual address
800 of the consistent memory pool. This pool of virtual
801 memory is used to make consistent memory allocations.
803 config CONSISTENT_START
804 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
805 default "0xff100000" if NOT_COHERENT_CACHE
807 config CONSISTENT_SIZE_BOOL
808 bool "Set custom consistent memory pool size"
809 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
811 This option allows you to set the size of the
812 consistent memory pool. This pool of virtual memory
813 is used to make consistent memory allocations.
815 config CONSISTENT_SIZE
816 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
817 default "0x00200000" if NOT_COHERENT_CACHE
819 config BOOT_LOAD_BOOL
820 bool "Set the boot link/load address"
821 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
823 This option allows you to set the initial load address of the zImage
824 or zImage.initrd file. This can be useful if you are on a board
825 which has a small amount of memory.
827 Say N here unless you know what you are doing.
830 hex "Link/load address for booting" if BOOT_LOAD_BOOL
831 default "0x00400000" if 40x || 8xx || 8260
832 default "0x01000000" if 44x
836 bool "Pinned Kernel TLBs (860 ONLY)"
837 depends on ADVANCED_OPTIONS && 8xx
843 default "0xc000000000000000"
848 source "drivers/Kconfig"
852 # XXX source "arch/ppc/8xx_io/Kconfig"
854 # XXX source "arch/ppc/8260_io/Kconfig"
856 source "arch/powerpc/sysdev/qe_lib/Kconfig"
860 menu "Instrumentation Support"
861 depends on EXPERIMENTAL
863 source "arch/powerpc/oprofile/Kconfig"
866 bool "Kprobes (EXPERIMENTAL)"
867 depends on !BOOKE && !4xx && KALLSYMS && EXPERIMENTAL && MODULES
869 Kprobes allows you to trap at almost any kernel address and
870 execute a callback function. register_kprobe() establishes
871 a probepoint and specifies the callback. Kprobes is useful
872 for kernel debugging, non-intrusive instrumentation and testing.
873 If in doubt, say "N".
876 source "arch/powerpc/Kconfig.debug"
878 source "security/Kconfig"
882 depends on COMPAT && KEYS
885 source "crypto/Kconfig"