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_HWEIGHT
44 config GENERIC_CALIBRATE_DELAY
62 depends on COMPAT && SYSVIPC
65 # All PPC32s use generic nvram driver through ppc_md
70 config SCHED_NO_NO_OMIT_FRAME_POINTER
74 config ARCH_MAY_HAVE_PC_FDC
87 default y if PPC32 && SMP
93 Used to allow a board to specify it wants a uImage built by default
96 menu "Processor support"
98 prompt "Processor Type"
107 There are four families of PowerPC chips supported. The more common
108 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
109 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
110 embedded versions (403 and 405) and the high end 64 bit Power
111 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
113 Unless you are building a kernel for one of the embedded processor
114 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
115 Note that the kernel runs in 32-bit mode even on 64-bit chips.
118 bool "Freescale 52xx"
123 bool "Freescale 82xx"
128 bool "Freescale 83xx"
135 bool "Freescale 85xx"
150 bool "Freescale e200"
155 bool "Optimize for POWER4"
159 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
160 The resulting binary will not work on POWER3 or RS64 processors
161 when compiled with binutils 2.15 or later.
166 default y if !POWER4_ONLY
175 # this is temp to handle compat with arch=ppc
179 # this is temp to handle compat with arch=ppc
192 depends on E200 || E500
197 depends on E200 || E500
202 depends on 44x || E500
204 default y if E500 && PHYS_64BIT
207 bool 'Large physical address support' if E500
208 depends on 44x || E500
211 This option enables kernel support for larger than 32-bit physical
212 addresses. This features is not be available on all e500 cores.
214 If in doubt, say N here.
217 bool "AltiVec Support"
218 depends on CLASSIC32 || POWER4
220 This option enables kernel support for the Altivec extensions to the
221 PowerPC processor. The kernel currently supports saving and restoring
222 altivec registers, and turning on the 'altivec enable' bit so user
223 processes can execute altivec instructions.
225 This option is only usefully if you have a processor that supports
226 altivec (G4, otherwise known as 74xx series), but does not have
227 any affect on a non-altivec cpu (it does, however add code to the
230 If in doubt, say Y here.
234 depends on E200 || E500
237 This option enables kernel support for the Signal Processing
238 Extensions (SPE) to the PowerPC processor. The kernel currently
239 supports saving and restoring SPE registers, and turning on the
240 'spe enable' bit so user processes can execute SPE instructions.
242 This option is only useful if you have a processor that supports
243 SPE (e500, otherwise known as 85xx series), but does not have any
244 effect on a non-spe cpu (it does, however add code to the kernel).
246 If in doubt, say Y here.
250 depends on 6xx || POWER3 || POWER4 || PPC64
253 config PPC_STD_MMU_32
255 depends on PPC_STD_MMU && PPC32
257 config VIRT_CPU_ACCOUNTING
258 bool "Deterministic task and CPU time accounting"
262 Select this option to enable more accurate task and CPU time
263 accounting. This is done by reading a CPU counter on each
264 kernel entry and exit and on transitions within the kernel
265 between system, softirq and hardirq state, so there is a
266 small performance impact. This also enables accounting of
267 stolen time on logically-partitioned systems running on
268 IBM POWER5-based machines.
270 If in doubt, say Y here.
273 depends on PPC_STD_MMU
274 bool "Symmetric multi-processing support"
276 This enables support for systems with more than one CPU. If you have
277 a system with only one CPU, say N. If you have a system with more
278 than one CPU, say Y. Note that the kernel does not currently
279 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
280 since they have inadequate hardware support for multiprocessor
283 If you say N here, the kernel will run on single and multiprocessor
284 machines, but will use only one CPU of a multiprocessor machine. If
285 you say Y here, the kernel will run on single-processor machines.
286 On a single-processor machine, the kernel will run faster if you say
289 If you don't know what to do here, say N.
292 int "Maximum number of CPUs (2-128)"
295 default "32" if PPC64
298 config NOT_COHERENT_CACHE
300 depends on 4xx || 8xx || E200
304 source "init/Kconfig"
306 menu "Platform support"
307 depends on PPC64 || CLASSIC32
310 prompt "Machine type"
311 default PPC_MULTIPLATFORM
313 config PPC_MULTIPLATFORM
314 bool "Generic desktop/server/laptop"
316 Select this option if configuring for an IBM pSeries or
317 RS/6000 machine, an Apple machine, or a PReP, CHRP,
318 Maple or Cell-based machine.
321 bool "IBM Legacy iSeries"
325 bool "Embedded 6xx/7xx/7xxx-based board"
326 depends on PPC32 && BROKEN
330 depends on PPC32 && BROKEN
332 Select APUS if configuring for a PowerUP Amiga.
333 More information is available at:
334 <http://linux-apus.sourceforge.net/>.
338 depends on PPC_MULTIPLATFORM && PPC64
339 bool " IBM pSeries & new (POWER5-based) iSeries"
342 select RTAS_ERROR_LOGGING
343 select PPC_UDBG_16550
347 bool " Common Hardware Reference Platform (CHRP) based machines"
348 depends on PPC_MULTIPLATFORM && PPC32
350 select PPC_INDIRECT_PCI
353 select PPC_UDBG_16550
357 bool " Apple PowerMac based machines"
358 depends on PPC_MULTIPLATFORM
359 select PPC_INDIRECT_PCI if PPC32
360 select PPC_MPC106 if PPC32
365 depends on PPC_PMAC && POWER4
367 select MPIC_BROKEN_U3
368 select GENERIC_TBSYNC
373 bool " PowerPC Reference Platform (PReP) based machines"
374 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
376 select PPC_INDIRECT_PCI
377 select PPC_UDBG_16550
381 depends on PPC_MULTIPLATFORM && PPC64
382 bool " Maple 970FX Evaluation Board"
384 select MPIC_BROKEN_U3
385 select GENERIC_TBSYNC
386 select PPC_UDBG_16550
390 This option enables support for the Maple 970FX Evaluation Board.
391 For more informations, refer to <http://www.970eval.com>
394 bool " Cell Broadband Processor Architecture"
395 depends on PPC_MULTIPLATFORM && PPC64
398 select PPC_UDBG_16550
401 depends on PPC_PSERIES
407 depends on PPC_MULTIPLATFORM && PPC64
411 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
419 config RTAS_ERROR_LOGGING
425 bool "Proc interface to RTAS"
430 tristate "Firmware flash interface"
431 depends on PPC64 && RTAS_PROC
437 config MPIC_BROKEN_U3
448 depends on PPC_PSERIES || PPC_ISERIES
453 depends on PPC_PSERIES
454 bool "Support for GX bus based adapters"
456 Bus device driver for GX bus based adapters.
466 source "drivers/cpufreq/Kconfig"
469 bool "Support for Apple PowerBooks"
470 depends on CPU_FREQ && ADB_PMU && PPC32
471 select CPU_FREQ_TABLE
473 This adds support for frequency switching on Apple PowerBooks,
474 this currently includes some models of iBook & Titanium
477 config CPU_FREQ_PMAC64
478 bool "Support for some Apple G5s"
479 depends on CPU_FREQ && PMAC_SMU && PPC64
480 select CPU_FREQ_TABLE
482 This adds support for frequency switching on Apple iMac G5,
483 and some of the more recent desktop G5 machines as well.
485 config PPC601_SYNC_FIX
486 bool "Workarounds for PPC601 bugs"
487 depends on 6xx && (PPC_PREP || PPC_PMAC)
489 Some versions of the PPC601 (the first PowerPC chip) have bugs which
490 mean that extra synchronization instructions are required near
491 certain instructions, typically those that make major changes to the
492 CPU state. These extra instructions reduce performance slightly.
493 If you say N here, these extra instructions will not be included,
494 resulting in a kernel which will run faster but may not run at all
495 on some systems with the PPC601 chip.
497 If in doubt, say Y here.
500 bool "On-chip CPU temperature sensor support"
503 G3 and G4 processors have an on-chip temperature sensor called the
504 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
505 temperature within 2-4 degrees Celsius. This option shows the current
506 on-die temperature in /proc/cpuinfo if the cpu supports it.
508 Unfortunately, on some chip revisions, this sensor is very inaccurate
509 and in many cases, does not work at all, so don't assume the cpu
510 temp is actually what /proc/cpuinfo says it is.
513 bool "Interrupt driven TAU driver (DANGEROUS)"
516 The TAU supports an interrupt driven mode which causes an interrupt
517 whenever the temperature goes out of range. This is the fastest way
518 to get notified the temp has exceeded a range. With this option off,
519 a timer is used to re-check the temperature periodically.
521 However, on some cpus it appears that the TAU interrupt hardware
522 is buggy and can cause a situation which would lead unexplained hard
525 Unless you are extending the TAU driver, or enjoy kernel/hardware
526 debugging, leave this option off.
529 bool "Average high and low temp"
532 The TAU hardware can compare the temperature to an upper and lower
533 bound. The default behavior is to show both the upper and lower
534 bound in /proc/cpuinfo. If the range is large, the temperature is
535 either changing a lot, or the TAU hardware is broken (likely on some
536 G4's). If the range is small (around 4 degrees), the temperature is
537 relatively stable. If you say Y here, a single temperature value,
538 halfway between the upper and lower bounds, will be reported in
541 If in doubt, say N here.
544 source arch/powerpc/platforms/embedded6xx/Kconfig
545 source arch/powerpc/platforms/4xx/Kconfig
546 source arch/powerpc/platforms/83xx/Kconfig
547 source arch/powerpc/platforms/85xx/Kconfig
548 source arch/powerpc/platforms/8xx/Kconfig
549 source arch/powerpc/platforms/cell/Kconfig
551 menu "Kernel options"
554 bool "High memory support"
557 source kernel/Kconfig.hz
558 source kernel/Kconfig.preempt
559 source "fs/Kconfig.binfmt"
561 # We optimistically allocate largepages from the VM, so make the limit
562 # large enough (16MB). This badly named config option is actually
564 config FORCE_MAX_ZONEORDER
567 default "9" if PPC_64K_PAGES
570 config MATH_EMULATION
571 bool "Math emulation"
572 depends on 4xx || 8xx || E200 || E500
574 Some PowerPC chips designed for embedded applications do not have
575 a floating-point unit and therefore do not implement the
576 floating-point instructions in the PowerPC instruction set. If you
577 say Y here, the kernel will include code to emulate a floating-point
578 unit, which will allow programs that use floating-point
582 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
583 depends on EXPERIMENTAL && PPC64
586 Cause IO segments sent to a device for DMA to be merged virtually
587 by the IOMMU when they happen to have been allocated contiguously.
588 This doesn't add pressure to the IOMMU allocator. However, some
589 drivers don't support getting large merged segments coming back
590 from *_map_sg(). Say Y if you know the drivers you are using are
591 properly handling this case.
594 bool "Support for enabling/disabling CPUs"
595 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
597 Say Y here to be able to disable and re-enable individual
598 CPUs at runtime on SMP machines.
600 Say N if you are unsure.
603 bool "kexec system call (EXPERIMENTAL)"
604 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
606 kexec is a system call that implements the ability to shutdown your
607 current kernel, and to start another kernel. It is like a reboot
608 but it is indepedent of the system firmware. And like a reboot
609 you can start any kernel with it, not just Linux.
611 The name comes from the similiarity to the exec system call.
613 It is an ongoing process to be certain the hardware in a machine
614 is properly shutdown, so do not be surprised if this code does not
615 initially work for you. It may help to enable device hotplugging
616 support. As of this writing the exact hardware interface is
617 strongly in flux, so no good recommendation can be made.
620 bool "Build a kdump crash kernel (EXPERIMENTAL)"
621 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
623 Build a kernel suitable for use as a kdump capture kernel.
624 The kernel will be linked at a different address than normal, and
625 so can only be used for Kdump.
627 Don't change this unless you know what you are doing.
631 depends on 8xx || 8260
635 bool "PC PS/2 style Keyboard"
636 depends on 4xx || CPM2
639 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
640 default y if PPC_PREP
643 bool "Distribute interrupts on all CPUs by default"
644 depends on SMP && !MV64360
646 This option gives the kernel permission to distribute IRQs across
647 multiple CPUs. Saying N here will route all IRQs to the first
648 CPU. Generally saying Y is safe, although some problems have been
649 reported with SMP Power Macintoshes with this option enabled.
651 source "arch/powerpc/platforms/pseries/Kconfig"
656 default y if SMP && PPC_PSERIES
658 config ARCH_SELECT_MEMORY_MODEL
662 config ARCH_FLATMEM_ENABLE
664 depends on (PPC64 && !NUMA) || PPC32
666 config ARCH_SPARSEMEM_ENABLE
670 config ARCH_SPARSEMEM_DEFAULT
672 depends on SMP && PPC_PSERIES
676 config HAVE_ARCH_EARLY_PFN_TO_NID
678 depends on NEED_MULTIPLE_NODES
680 config ARCH_MEMORY_PROBE
682 depends on MEMORY_HOTPLUG
688 This option changes the kernel logical page size to 64k. On machines
689 without processor support for 64k pages, the kernel will simulate
690 them by loading each individual 4k page on demand transparently,
691 while on hardware with such support, it will be used to map
692 normal application pages.
695 bool "SMT (Hyperthreading) scheduler support"
696 depends on PPC64 && SMP
699 SMT scheduler support improves the CPU scheduler's decision making
700 when dealing with POWER5 cpus at a cost of slightly increased
701 overhead in some places. If unsure say N here.
703 config PROC_DEVICETREE
704 bool "Support for device tree in /proc"
707 This option adds a device-tree directory under /proc which contains
708 an image of the device tree that the kernel copies from Open
709 Firmware or other boot firmware. If unsure, say Y here.
711 source "arch/powerpc/platforms/prep/Kconfig"
714 bool "Default bootloader kernel arguments"
715 depends on !PPC_ISERIES
718 string "Initial kernel command string"
719 depends on CMDLINE_BOOL
720 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
722 On some platforms, there is currently no way for the boot loader to
723 pass arguments to the kernel. For these platforms, you can supply
724 some command-line options at build time by entering them here. In
725 most cases you will need to specify the root device here.
728 source kernel/power/Kconfig
732 bool "Enable seccomp to safely compute untrusted bytecode"
736 This kernel feature is useful for number crunching applications
737 that may need to compute untrusted bytecode during their
738 execution. By using pipes or other transports made available to
739 the process as file descriptors supporting the read/write
740 syscalls, it's possible to isolate those applications in
741 their own address space using seccomp. Once seccomp is
742 enabled via /proc/<pid>/seccomp, it cannot be disabled
743 and the task is only allowed to execute a few safe syscalls
744 defined by each seccomp mode.
746 If unsure, say Y. Only embedded should say N here.
757 bool "Support for ISA-bus hardware"
758 depends on PPC_PREP || PPC_CHRP
761 Find out whether you have ISA slots on your motherboard. ISA is the
762 name of a bus system, i.e. the way the CPU talks to the other stuff
763 inside your box. If you have an Apple machine, say N here; if you
764 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
765 you have an embedded board, consult your board documentation.
767 config GENERIC_ISA_DMA
769 depends on PPC64 || POWER4 || 6xx && !CPM2
776 config PPC_INDIRECT_PCI
779 default y if 40x || 44x
791 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
796 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
797 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx
798 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
799 default PCI_QSPAN if !4xx && !CPM2 && 8xx
801 Find out whether your system includes a PCI bus. PCI is the name of
802 a bus system, i.e. the way the CPU talks to the other stuff inside
803 your box. If you say Y here, the kernel will include drivers and
804 infrastructure code to support PCI bus devices.
812 depends on !4xx && !CPM2 && 8xx
815 Say Y here if you have a system based on a Motorola 8xx-series
816 embedded processor with a QSPAN PCI interface, otherwise say N.
820 depends on PCI && 8260
821 select PPC_INDIRECT_PCI
825 bool " Enable workaround for MPC826x erratum PCI 9"
826 depends on PCI_8260 && !ADS8272
830 prompt " IDMA channel for PCI 9 workaround"
833 config 8260_PCI9_IDMA1
836 config 8260_PCI9_IDMA2
839 config 8260_PCI9_IDMA3
842 config 8260_PCI9_IDMA4
847 source "drivers/pci/Kconfig"
849 source "drivers/pcmcia/Kconfig"
851 source "drivers/pci/hotplug/Kconfig"
855 menu "Advanced setup"
858 config ADVANCED_OPTIONS
859 bool "Prompt for advanced kernel configuration options"
861 This option will enable prompting for a variety of advanced kernel
862 configuration options. These options can cause the kernel to not
863 work if they are set incorrectly, but can be used to optimize certain
864 aspects of kernel memory management.
866 Unless you know what you are doing, say N here.
868 comment "Default settings for advanced configuration options are used"
869 depends on !ADVANCED_OPTIONS
871 config HIGHMEM_START_BOOL
872 bool "Set high memory pool address"
873 depends on ADVANCED_OPTIONS && HIGHMEM
875 This option allows you to set the base address of the kernel virtual
876 area used to map high memory pages. This can be useful in
877 optimizing the layout of kernel virtual memory.
879 Say N here unless you know what you are doing.
882 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
885 config LOWMEM_SIZE_BOOL
886 bool "Set maximum low memory"
887 depends on ADVANCED_OPTIONS
889 This option allows you to set the maximum amount of memory which
890 will be used as "low memory", that is, memory which the kernel can
891 access directly, without having to set up a kernel virtual mapping.
892 This can be useful in optimizing the layout of kernel virtual
895 Say N here unless you know what you are doing.
898 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
901 config KERNEL_START_BOOL
902 bool "Set custom kernel base address"
903 depends on ADVANCED_OPTIONS
905 This option allows you to set the kernel virtual address at which
906 the kernel will map low memory (the kernel image will be linked at
907 this address). This can be useful in optimizing the virtual memory
908 layout of the system.
910 Say N here unless you know what you are doing.
913 hex "Virtual address of kernel base" if KERNEL_START_BOOL
916 config TASK_SIZE_BOOL
917 bool "Set custom user task size"
918 depends on ADVANCED_OPTIONS
920 This option allows you to set the amount of virtual address space
921 allocated to user tasks. This can be useful in optimizing the
922 virtual memory layout of the system.
924 Say N here unless you know what you are doing.
927 hex "Size of user task space" if TASK_SIZE_BOOL
930 config CONSISTENT_START_BOOL
931 bool "Set custom consistent memory pool address"
932 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
934 This option allows you to set the base virtual address
935 of the the consistent memory pool. This pool of virtual
936 memory is used to make consistent memory allocations.
938 config CONSISTENT_START
939 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
940 default "0xff100000" if NOT_COHERENT_CACHE
942 config CONSISTENT_SIZE_BOOL
943 bool "Set custom consistent memory pool size"
944 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
946 This option allows you to set the size of the the
947 consistent memory pool. This pool of virtual memory
948 is used to make consistent memory allocations.
950 config CONSISTENT_SIZE
951 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
952 default "0x00200000" if NOT_COHERENT_CACHE
954 config BOOT_LOAD_BOOL
955 bool "Set the boot link/load address"
956 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
958 This option allows you to set the initial load address of the zImage
959 or zImage.initrd file. This can be useful if you are on a board
960 which has a small amount of memory.
962 Say N here unless you know what you are doing.
965 hex "Link/load address for booting" if BOOT_LOAD_BOOL
966 default "0x00400000" if 40x || 8xx || 8260
967 default "0x01000000" if 44x
971 bool "Pinned Kernel TLBs (860 ONLY)"
972 depends on ADVANCED_OPTIONS && 8xx
978 default "0xc000000000000000"
983 source "drivers/Kconfig"
987 # XXX source "arch/ppc/8xx_io/Kconfig"
989 # XXX source "arch/ppc/8260_io/Kconfig"
991 source "arch/powerpc/platforms/iseries/Kconfig"
995 menu "Instrumentation Support"
996 depends on EXPERIMENTAL
998 source "arch/powerpc/oprofile/Kconfig"
1001 bool "Kprobes (EXPERIMENTAL)"
1002 depends on PPC64 && EXPERIMENTAL && MODULES
1004 Kprobes allows you to trap at almost any kernel address and
1005 execute a callback function. register_kprobe() establishes
1006 a probepoint and specifies the callback. Kprobes is useful
1007 for kernel debugging, non-intrusive instrumentation and testing.
1008 If in doubt, say "N".
1011 source "arch/powerpc/Kconfig.debug"
1013 source "security/Kconfig"
1017 depends on COMPAT && KEYS
1020 source "crypto/Kconfig"