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
29 config GENERIC_HARDIRQS
33 config RWSEM_GENERIC_SPINLOCK
36 config RWSEM_XCHGADD_ALGORITHM
40 config GENERIC_CALIBRATE_DELAY
58 depends on COMPAT && SYSVIPC
61 # All PPC32s use generic nvram driver through ppc_md
66 config SCHED_NO_NO_OMIT_FRAME_POINTER
70 config ARCH_MAY_HAVE_PC_FDC
82 bool "kernel crash dumps (EXPERIMENTAL)"
83 depends on PPC_MULTIPLATFORM
84 depends on EXPERIMENTAL
86 Build a kernel suitable for use as a kdump capture kernel.
87 The kernel will be linked at a different address than normal, and
88 so can only be used for Kdump.
90 Don't change this unless you know what you are doing.
94 default y if PPC32 && SMP
97 menu "Processor support"
99 prompt "Processor Type"
108 There are four families of PowerPC chips supported. The more common
109 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
110 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
111 embedded versions (403 and 405) and the high end 64 bit Power
112 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
114 Unless you are building a kernel for one of the embedded processor
115 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
116 Note that the kernel runs in 32-bit mode even on 64-bit chips.
119 bool "Freescale 52xx"
124 bool "Freescale 82xx"
129 bool "Freescale 83xx"
145 bool "Freescale e200"
148 bool "Freescale e500"
152 bool "Optimize for POWER4"
156 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
157 The resulting binary will not work on POWER3 or RS64 processors
158 when compiled with binutils 2.15 or later.
163 default y if !POWER4_ONLY
172 # this is temp to handle compat with arch=ppc
182 depends on E200 || E500
187 depends on E200 || E500
192 depends on 44x || E500
194 default y if E500 && PHYS_64BIT
197 bool 'Large physical address support' if E500
198 depends on 44x || E500
201 This option enables kernel support for larger than 32-bit physical
202 addresses. This features is not be available on all e500 cores.
204 If in doubt, say N here.
207 bool "AltiVec Support"
208 depends on CLASSIC32 || POWER4
210 This option enables kernel support for the Altivec extensions to the
211 PowerPC processor. The kernel currently supports saving and restoring
212 altivec registers, and turning on the 'altivec enable' bit so user
213 processes can execute altivec instructions.
215 This option is only usefully if you have a processor that supports
216 altivec (G4, otherwise known as 74xx series), but does not have
217 any affect on a non-altivec cpu (it does, however add code to the
220 If in doubt, say Y here.
224 depends on E200 || E500
226 This option enables kernel support for the Signal Processing
227 Extensions (SPE) to the PowerPC processor. The kernel currently
228 supports saving and restoring SPE registers, and turning on the
229 'spe enable' bit so user processes can execute SPE instructions.
231 This option is only useful if you have a processor that supports
232 SPE (e500, otherwise known as 85xx series), but does not have any
233 effect on a non-spe cpu (it does, however add code to the kernel).
235 If in doubt, say Y here.
239 depends on 6xx || POWER3 || POWER4 || PPC64
242 config PPC_STD_MMU_32
244 depends on PPC_STD_MMU && PPC32
247 depends on PPC_STD_MMU
248 bool "Symmetric multi-processing support"
250 This enables support for systems with more than one CPU. If you have
251 a system with only one CPU, say N. If you have a system with more
252 than one CPU, say Y. Note that the kernel does not currently
253 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
254 since they have inadequate hardware support for multiprocessor
257 If you say N here, the kernel will run on single and multiprocessor
258 machines, but will use only one CPU of a multiprocessor machine. If
259 you say Y here, the kernel will run on single-processor machines.
260 On a single-processor machine, the kernel will run faster if you say
263 If you don't know what to do here, say N.
266 int "Maximum number of CPUs (2-128)"
269 default "32" if PPC64
272 config NOT_COHERENT_CACHE
274 depends on 4xx || 8xx || E200
278 source "init/Kconfig"
280 menu "Platform support"
281 depends on PPC64 || CLASSIC32
284 prompt "Machine type"
285 default PPC_MULTIPLATFORM
287 config PPC_MULTIPLATFORM
288 bool "Generic desktop/server/laptop"
290 Select this option if configuring for an IBM pSeries or
291 RS/6000 machine, an Apple machine, or a PReP, CHRP,
292 Maple or Cell-based machine.
295 bool "IBM Legacy iSeries"
299 bool "Embedded 6xx/7xx/7xxx-based board"
300 depends on PPC32 && BROKEN
304 depends on PPC32 && BROKEN
306 Select APUS if configuring for a PowerUP Amiga.
307 More information is available at:
308 <http://linux-apus.sourceforge.net/>.
312 depends on PPC_MULTIPLATFORM && PPC64
313 bool " IBM pSeries & new (POWER5-based) iSeries"
316 select RTAS_ERROR_LOGGING
317 select PPC_UDBG_16550
321 bool " Common Hardware Reference Platform (CHRP) based machines"
322 depends on PPC_MULTIPLATFORM && PPC32
324 select PPC_INDIRECT_PCI
327 select PPC_UDBG_16550
331 bool " Apple PowerMac based machines"
332 depends on PPC_MULTIPLATFORM
333 select PPC_INDIRECT_PCI if PPC32
334 select PPC_MPC106 if PPC32
339 depends on PPC_PMAC && POWER4
341 select MPIC_BROKEN_U3
342 select GENERIC_TBSYNC
346 bool " PowerPC Reference Platform (PReP) based machines"
347 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
349 select PPC_INDIRECT_PCI
350 select PPC_UDBG_16550
354 depends on PPC_MULTIPLATFORM && PPC64
355 bool " Maple 970FX Evaluation Board"
357 select MPIC_BROKEN_U3
358 select GENERIC_TBSYNC
359 select PPC_UDBG_16550
362 This option enables support for the Maple 970FX Evaluation Board.
363 For more informations, refer to <http://www.970eval.com>
366 bool " Cell Broadband Processor Architecture"
367 depends on PPC_MULTIPLATFORM && PPC64
370 select PPC_UDBG_16550
373 depends on PPC_PSERIES
379 depends on PPC_MULTIPLATFORM && PPC64
383 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
391 config RTAS_ERROR_LOGGING
397 bool "Proc interface to RTAS"
402 tristate "Firmware flash interface"
403 depends on PPC64 && RTAS_PROC
409 config MPIC_BROKEN_U3
420 depends on PPC_PSERIES || PPC_ISERIES
425 depends on PPC_PSERIES
426 bool "Support for GX bus based adapters"
428 Bus device driver for GX bus based adapters.
434 source "drivers/cpufreq/Kconfig"
437 bool "Support for Apple PowerBooks"
438 depends on CPU_FREQ && ADB_PMU && PPC32
439 select CPU_FREQ_TABLE
441 This adds support for frequency switching on Apple PowerBooks,
442 this currently includes some models of iBook & Titanium
445 config CPU_FREQ_PMAC64
446 bool "Support for some Apple G5s"
447 depends on CPU_FREQ && PMAC_SMU && PPC64
448 select CPU_FREQ_TABLE
450 This adds support for frequency switching on Apple iMac G5,
451 and some of the more recent desktop G5 machines as well.
453 config PPC601_SYNC_FIX
454 bool "Workarounds for PPC601 bugs"
455 depends on 6xx && (PPC_PREP || PPC_PMAC)
457 Some versions of the PPC601 (the first PowerPC chip) have bugs which
458 mean that extra synchronization instructions are required near
459 certain instructions, typically those that make major changes to the
460 CPU state. These extra instructions reduce performance slightly.
461 If you say N here, these extra instructions will not be included,
462 resulting in a kernel which will run faster but may not run at all
463 on some systems with the PPC601 chip.
465 If in doubt, say Y here.
468 bool "Thermal Management Support"
471 G3 and G4 processors have an on-chip temperature sensor called the
472 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
473 temperature within 2-4 degrees Celsius. This option shows the current
474 on-die temperature in /proc/cpuinfo if the cpu supports it.
476 Unfortunately, on some chip revisions, this sensor is very inaccurate
477 and in some cases, does not work at all, so don't assume the cpu
478 temp is actually what /proc/cpuinfo says it is.
481 bool "Interrupt driven TAU driver (DANGEROUS)"
484 The TAU supports an interrupt driven mode which causes an interrupt
485 whenever the temperature goes out of range. This is the fastest way
486 to get notified the temp has exceeded a range. With this option off,
487 a timer is used to re-check the temperature periodically.
489 However, on some cpus it appears that the TAU interrupt hardware
490 is buggy and can cause a situation which would lead unexplained hard
493 Unless you are extending the TAU driver, or enjoy kernel/hardware
494 debugging, leave this option off.
497 bool "Average high and low temp"
500 The TAU hardware can compare the temperature to an upper and lower
501 bound. The default behavior is to show both the upper and lower
502 bound in /proc/cpuinfo. If the range is large, the temperature is
503 either changing a lot, or the TAU hardware is broken (likely on some
504 G4's). If the range is small (around 4 degrees), the temperature is
505 relatively stable. If you say Y here, a single temperature value,
506 halfway between the upper and lower bounds, will be reported in
509 If in doubt, say N here.
512 source arch/powerpc/platforms/embedded6xx/Kconfig
513 source arch/powerpc/platforms/4xx/Kconfig
514 source arch/powerpc/platforms/83xx/Kconfig
515 source arch/powerpc/platforms/85xx/Kconfig
516 source arch/powerpc/platforms/8xx/Kconfig
517 source arch/powerpc/platforms/cell/Kconfig
519 menu "Kernel options"
522 bool "High memory support"
525 source kernel/Kconfig.hz
526 source kernel/Kconfig.preempt
527 source "fs/Kconfig.binfmt"
529 # We optimistically allocate largepages from the VM, so make the limit
530 # large enough (16MB). This badly named config option is actually
532 config FORCE_MAX_ZONEORDER
535 default "9" if PPC_64K_PAGES
538 config MATH_EMULATION
539 bool "Math emulation"
540 depends on 4xx || 8xx || E200 || E500
542 Some PowerPC chips designed for embedded applications do not have
543 a floating-point unit and therefore do not implement the
544 floating-point instructions in the PowerPC instruction set. If you
545 say Y here, the kernel will include code to emulate a floating-point
546 unit, which will allow programs that use floating-point
550 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
551 depends on EXPERIMENTAL && PPC64
554 Cause IO segments sent to a device for DMA to be merged virtually
555 by the IOMMU when they happen to have been allocated contiguously.
556 This doesn't add pressure to the IOMMU allocator. However, some
557 drivers don't support getting large merged segments coming back
558 from *_map_sg(). Say Y if you know the drivers you are using are
559 properly handling this case.
562 bool "Support for enabling/disabling CPUs"
563 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
565 Say Y here to be able to disable and re-enable individual
566 CPUs at runtime on SMP machines.
568 Say N if you are unsure.
571 bool "kexec system call (EXPERIMENTAL)"
572 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
574 kexec is a system call that implements the ability to shutdown your
575 current kernel, and to start another kernel. It is like a reboot
576 but it is indepedent of the system firmware. And like a reboot
577 you can start any kernel with it, not just Linux.
579 The name comes from the similiarity to the exec system call.
581 It is an ongoing process to be certain the hardware in a machine
582 is properly shutdown, so do not be surprised if this code does not
583 initially work for you. It may help to enable device hotplugging
584 support. As of this writing the exact hardware interface is
585 strongly in flux, so no good recommendation can be made.
589 depends on 8xx || 8260
593 bool "PC PS/2 style Keyboard"
594 depends on 4xx || CPM2
597 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
598 default y if PPC_PREP
601 bool "Distribute interrupts on all CPUs by default"
602 depends on SMP && !MV64360
604 This option gives the kernel permission to distribute IRQs across
605 multiple CPUs. Saying N here will route all IRQs to the first
606 CPU. Generally saying Y is safe, although some problems have been
607 reported with SMP Power Macintoshes with this option enabled.
609 source "arch/powerpc/platforms/pseries/Kconfig"
614 default y if SMP && PPC_PSERIES
616 config ARCH_SELECT_MEMORY_MODEL
620 config ARCH_FLATMEM_ENABLE
622 depends on (PPC64 && !NUMA) || PPC32
624 config ARCH_SPARSEMEM_ENABLE
628 config ARCH_SPARSEMEM_DEFAULT
630 depends on SMP && PPC_PSERIES
634 config HAVE_ARCH_EARLY_PFN_TO_NID
636 depends on NEED_MULTIPLE_NODES
638 config ARCH_MEMORY_PROBE
640 depends on MEMORY_HOTPLUG
646 This option changes the kernel logical page size to 64k. On machines
647 without processor support for 64k pages, the kernel will simulate
648 them by loading each individual 4k page on demand transparently,
649 while on hardware with such support, it will be used to map
650 normal application pages.
653 bool "SMT (Hyperthreading) scheduler support"
654 depends on PPC64 && SMP
657 SMT scheduler support improves the CPU scheduler's decision making
658 when dealing with POWER5 cpus at a cost of slightly increased
659 overhead in some places. If unsure say N here.
661 config PROC_DEVICETREE
662 bool "Support for device tree in /proc"
665 This option adds a device-tree directory under /proc which contains
666 an image of the device tree that the kernel copies from Open
667 Firmware or other boot firmware. If unsure, say Y here.
669 source "arch/powerpc/platforms/prep/Kconfig"
672 bool "Default bootloader kernel arguments"
673 depends on !PPC_ISERIES
676 string "Initial kernel command string"
677 depends on CMDLINE_BOOL
678 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
680 On some platforms, there is currently no way for the boot loader to
681 pass arguments to the kernel. For these platforms, you can supply
682 some command-line options at build time by entering them here. In
683 most cases you will need to specify the root device here.
686 source kernel/power/Kconfig
690 bool "Enable seccomp to safely compute untrusted bytecode"
694 This kernel feature is useful for number crunching applications
695 that may need to compute untrusted bytecode during their
696 execution. By using pipes or other transports made available to
697 the process as file descriptors supporting the read/write
698 syscalls, it's possible to isolate those applications in
699 their own address space using seccomp. Once seccomp is
700 enabled via /proc/<pid>/seccomp, it cannot be disabled
701 and the task is only allowed to execute a few safe syscalls
702 defined by each seccomp mode.
704 If unsure, say Y. Only embedded should say N here.
715 bool "Support for ISA-bus hardware"
716 depends on PPC_PREP || PPC_CHRP
719 Find out whether you have ISA slots on your motherboard. ISA is the
720 name of a bus system, i.e. the way the CPU talks to the other stuff
721 inside your box. If you have an Apple machine, say N here; if you
722 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
723 you have an embedded board, consult your board documentation.
725 config GENERIC_ISA_DMA
727 depends on PPC64 || POWER4 || 6xx && !CPM2
735 config PPC_INDIRECT_PCI
738 default y if 40x || 44x || 85xx
750 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
755 bool "PCI support" if 40x || CPM2 || PPC_83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
756 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !85xx
757 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
758 default PCI_QSPAN if !4xx && !CPM2 && 8xx
760 Find out whether your system includes a PCI bus. PCI is the name of
761 a bus system, i.e. the way the CPU talks to the other stuff inside
762 your box. If you say Y here, the kernel will include drivers and
763 infrastructure code to support PCI bus devices.
771 depends on !4xx && !CPM2 && 8xx
774 Say Y here if you have a system based on a Motorola 8xx-series
775 embedded processor with a QSPAN PCI interface, otherwise say N.
779 depends on PCI && 8260
780 select PPC_INDIRECT_PCI
784 bool " Enable workaround for MPC826x erratum PCI 9"
785 depends on PCI_8260 && !ADS8272
789 prompt " IDMA channel for PCI 9 workaround"
792 config 8260_PCI9_IDMA1
795 config 8260_PCI9_IDMA2
798 config 8260_PCI9_IDMA3
801 config 8260_PCI9_IDMA4
806 source "drivers/pci/Kconfig"
808 source "drivers/pcmcia/Kconfig"
810 source "drivers/pci/hotplug/Kconfig"
814 menu "Advanced setup"
817 config ADVANCED_OPTIONS
818 bool "Prompt for advanced kernel configuration options"
820 This option will enable prompting for a variety of advanced kernel
821 configuration options. These options can cause the kernel to not
822 work if they are set incorrectly, but can be used to optimize certain
823 aspects of kernel memory management.
825 Unless you know what you are doing, say N here.
827 comment "Default settings for advanced configuration options are used"
828 depends on !ADVANCED_OPTIONS
830 config HIGHMEM_START_BOOL
831 bool "Set high memory pool address"
832 depends on ADVANCED_OPTIONS && HIGHMEM
834 This option allows you to set the base address of the kernel virtual
835 area used to map high memory pages. This can be useful in
836 optimizing the layout of kernel virtual memory.
838 Say N here unless you know what you are doing.
841 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
844 config LOWMEM_SIZE_BOOL
845 bool "Set maximum low memory"
846 depends on ADVANCED_OPTIONS
848 This option allows you to set the maximum amount of memory which
849 will be used as "low memory", that is, memory which the kernel can
850 access directly, without having to set up a kernel virtual mapping.
851 This can be useful in optimizing the layout of kernel virtual
854 Say N here unless you know what you are doing.
857 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
860 config KERNEL_START_BOOL
861 bool "Set custom kernel base address"
862 depends on ADVANCED_OPTIONS
864 This option allows you to set the kernel virtual address at which
865 the kernel will map low memory (the kernel image will be linked at
866 this address). This can be useful in optimizing the virtual memory
867 layout of the system.
869 Say N here unless you know what you are doing.
872 hex "Virtual address of kernel base" if KERNEL_START_BOOL
875 config TASK_SIZE_BOOL
876 bool "Set custom user task size"
877 depends on ADVANCED_OPTIONS
879 This option allows you to set the amount of virtual address space
880 allocated to user tasks. This can be useful in optimizing the
881 virtual memory layout of the system.
883 Say N here unless you know what you are doing.
886 hex "Size of user task space" if TASK_SIZE_BOOL
889 config CONSISTENT_START_BOOL
890 bool "Set custom consistent memory pool address"
891 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
893 This option allows you to set the base virtual address
894 of the the consistent memory pool. This pool of virtual
895 memory is used to make consistent memory allocations.
897 config CONSISTENT_START
898 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
899 default "0xff100000" if NOT_COHERENT_CACHE
901 config CONSISTENT_SIZE_BOOL
902 bool "Set custom consistent memory pool size"
903 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
905 This option allows you to set the size of the the
906 consistent memory pool. This pool of virtual memory
907 is used to make consistent memory allocations.
909 config CONSISTENT_SIZE
910 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
911 default "0x00200000" if NOT_COHERENT_CACHE
913 config BOOT_LOAD_BOOL
914 bool "Set the boot link/load address"
915 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
917 This option allows you to set the initial load address of the zImage
918 or zImage.initrd file. This can be useful if you are on a board
919 which has a small amount of memory.
921 Say N here unless you know what you are doing.
924 hex "Link/load address for booting" if BOOT_LOAD_BOOL
925 default "0x00400000" if 40x || 8xx || 8260
926 default "0x01000000" if 44x
930 bool "Pinned Kernel TLBs (860 ONLY)"
931 depends on ADVANCED_OPTIONS && 8xx
937 default "0xc000000000000000"
942 source "drivers/Kconfig"
946 # XXX source "arch/ppc/8xx_io/Kconfig"
948 # XXX source "arch/ppc/8260_io/Kconfig"
950 source "arch/powerpc/platforms/iseries/Kconfig"
954 menu "Instrumentation Support"
955 depends on EXPERIMENTAL
957 source "arch/powerpc/oprofile/Kconfig"
960 bool "Kprobes (EXPERIMENTAL)"
963 Kprobes allows you to trap at almost any kernel address and
964 execute a callback function. register_kprobe() establishes
965 a probepoint and specifies the callback. Kprobes is useful
966 for kernel debugging, non-intrusive instrumentation and testing.
967 If in doubt, say "N".
970 source "arch/powerpc/Kconfig.debug"
972 source "security/Kconfig"
976 depends on COMPAT && KEYS
979 source "crypto/Kconfig"