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
372 bool " PowerPC Reference Platform (PReP) based machines"
373 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
375 select PPC_INDIRECT_PCI
376 select PPC_UDBG_16550
380 depends on PPC_MULTIPLATFORM && PPC64
381 bool " Maple 970FX Evaluation Board"
383 select MPIC_BROKEN_U3
384 select GENERIC_TBSYNC
385 select PPC_UDBG_16550
388 This option enables support for the Maple 970FX Evaluation Board.
389 For more informations, refer to <http://www.970eval.com>
392 bool " Cell Broadband Processor Architecture"
393 depends on PPC_MULTIPLATFORM && PPC64
396 select PPC_UDBG_16550
399 depends on PPC_PSERIES
405 depends on PPC_MULTIPLATFORM && PPC64
409 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
417 config RTAS_ERROR_LOGGING
423 bool "Proc interface to RTAS"
428 tristate "Firmware flash interface"
429 depends on PPC64 && RTAS_PROC
435 config MPIC_BROKEN_U3
446 depends on PPC_PSERIES || PPC_ISERIES
451 depends on PPC_PSERIES
452 bool "Support for GX bus based adapters"
454 Bus device driver for GX bus based adapters.
460 source "drivers/cpufreq/Kconfig"
463 bool "Support for Apple PowerBooks"
464 depends on CPU_FREQ && ADB_PMU && PPC32
465 select CPU_FREQ_TABLE
467 This adds support for frequency switching on Apple PowerBooks,
468 this currently includes some models of iBook & Titanium
471 config CPU_FREQ_PMAC64
472 bool "Support for some Apple G5s"
473 depends on CPU_FREQ && PMAC_SMU && PPC64
474 select CPU_FREQ_TABLE
476 This adds support for frequency switching on Apple iMac G5,
477 and some of the more recent desktop G5 machines as well.
479 config PPC601_SYNC_FIX
480 bool "Workarounds for PPC601 bugs"
481 depends on 6xx && (PPC_PREP || PPC_PMAC)
483 Some versions of the PPC601 (the first PowerPC chip) have bugs which
484 mean that extra synchronization instructions are required near
485 certain instructions, typically those that make major changes to the
486 CPU state. These extra instructions reduce performance slightly.
487 If you say N here, these extra instructions will not be included,
488 resulting in a kernel which will run faster but may not run at all
489 on some systems with the PPC601 chip.
491 If in doubt, say Y here.
494 bool "On-chip CPU temperature sensor support"
497 G3 and G4 processors have an on-chip temperature sensor called the
498 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
499 temperature within 2-4 degrees Celsius. This option shows the current
500 on-die temperature in /proc/cpuinfo if the cpu supports it.
502 Unfortunately, on some chip revisions, this sensor is very inaccurate
503 and in many cases, does not work at all, so don't assume the cpu
504 temp is actually what /proc/cpuinfo says it is.
507 bool "Interrupt driven TAU driver (DANGEROUS)"
510 The TAU supports an interrupt driven mode which causes an interrupt
511 whenever the temperature goes out of range. This is the fastest way
512 to get notified the temp has exceeded a range. With this option off,
513 a timer is used to re-check the temperature periodically.
515 However, on some cpus it appears that the TAU interrupt hardware
516 is buggy and can cause a situation which would lead unexplained hard
519 Unless you are extending the TAU driver, or enjoy kernel/hardware
520 debugging, leave this option off.
523 bool "Average high and low temp"
526 The TAU hardware can compare the temperature to an upper and lower
527 bound. The default behavior is to show both the upper and lower
528 bound in /proc/cpuinfo. If the range is large, the temperature is
529 either changing a lot, or the TAU hardware is broken (likely on some
530 G4's). If the range is small (around 4 degrees), the temperature is
531 relatively stable. If you say Y here, a single temperature value,
532 halfway between the upper and lower bounds, will be reported in
535 If in doubt, say N here.
538 source arch/powerpc/platforms/embedded6xx/Kconfig
539 source arch/powerpc/platforms/4xx/Kconfig
540 source arch/powerpc/platforms/83xx/Kconfig
541 source arch/powerpc/platforms/85xx/Kconfig
542 source arch/powerpc/platforms/8xx/Kconfig
543 source arch/powerpc/platforms/cell/Kconfig
545 menu "Kernel options"
548 bool "High memory support"
551 source kernel/Kconfig.hz
552 source kernel/Kconfig.preempt
553 source "fs/Kconfig.binfmt"
555 # We optimistically allocate largepages from the VM, so make the limit
556 # large enough (16MB). This badly named config option is actually
558 config FORCE_MAX_ZONEORDER
561 default "9" if PPC_64K_PAGES
564 config MATH_EMULATION
565 bool "Math emulation"
566 depends on 4xx || 8xx || E200 || E500
568 Some PowerPC chips designed for embedded applications do not have
569 a floating-point unit and therefore do not implement the
570 floating-point instructions in the PowerPC instruction set. If you
571 say Y here, the kernel will include code to emulate a floating-point
572 unit, which will allow programs that use floating-point
576 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
577 depends on EXPERIMENTAL && PPC64
580 Cause IO segments sent to a device for DMA to be merged virtually
581 by the IOMMU when they happen to have been allocated contiguously.
582 This doesn't add pressure to the IOMMU allocator. However, some
583 drivers don't support getting large merged segments coming back
584 from *_map_sg(). Say Y if you know the drivers you are using are
585 properly handling this case.
588 bool "Support for enabling/disabling CPUs"
589 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
591 Say Y here to be able to disable and re-enable individual
592 CPUs at runtime on SMP machines.
594 Say N if you are unsure.
597 bool "kexec system call (EXPERIMENTAL)"
598 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
600 kexec is a system call that implements the ability to shutdown your
601 current kernel, and to start another kernel. It is like a reboot
602 but it is indepedent of the system firmware. And like a reboot
603 you can start any kernel with it, not just Linux.
605 The name comes from the similiarity to the exec system call.
607 It is an ongoing process to be certain the hardware in a machine
608 is properly shutdown, so do not be surprised if this code does not
609 initially work for you. It may help to enable device hotplugging
610 support. As of this writing the exact hardware interface is
611 strongly in flux, so no good recommendation can be made.
614 bool "Build a kdump crash kernel (EXPERIMENTAL)"
615 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
617 Build a kernel suitable for use as a kdump capture kernel.
618 The kernel will be linked at a different address than normal, and
619 so can only be used for Kdump.
621 Don't change this unless you know what you are doing.
625 depends on 8xx || 8260
629 bool "PC PS/2 style Keyboard"
630 depends on 4xx || CPM2
633 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
634 default y if PPC_PREP
637 bool "Distribute interrupts on all CPUs by default"
638 depends on SMP && !MV64360
640 This option gives the kernel permission to distribute IRQs across
641 multiple CPUs. Saying N here will route all IRQs to the first
642 CPU. Generally saying Y is safe, although some problems have been
643 reported with SMP Power Macintoshes with this option enabled.
645 source "arch/powerpc/platforms/pseries/Kconfig"
650 default y if SMP && PPC_PSERIES
655 depends on NEED_MULTIPLE_NODES
657 config ARCH_SELECT_MEMORY_MODEL
661 config ARCH_FLATMEM_ENABLE
663 depends on (PPC64 && !NUMA) || PPC32
665 config ARCH_SPARSEMEM_ENABLE
669 config ARCH_SPARSEMEM_DEFAULT
671 depends on SMP && PPC_PSERIES
675 config HAVE_ARCH_EARLY_PFN_TO_NID
677 depends on NEED_MULTIPLE_NODES
679 config ARCH_MEMORY_PROBE
681 depends on MEMORY_HOTPLUG
687 This option changes the kernel logical page size to 64k. On machines
688 without processor support for 64k pages, the kernel will simulate
689 them by loading each individual 4k page on demand transparently,
690 while on hardware with such support, it will be used to map
691 normal application pages.
694 bool "SMT (Hyperthreading) scheduler support"
695 depends on PPC64 && SMP
698 SMT scheduler support improves the CPU scheduler's decision making
699 when dealing with POWER5 cpus at a cost of slightly increased
700 overhead in some places. If unsure say N here.
702 config PROC_DEVICETREE
703 bool "Support for device tree in /proc"
706 This option adds a device-tree directory under /proc which contains
707 an image of the device tree that the kernel copies from Open
708 Firmware or other boot firmware. If unsure, say Y here.
710 source "arch/powerpc/platforms/prep/Kconfig"
713 bool "Default bootloader kernel arguments"
714 depends on !PPC_ISERIES
717 string "Initial kernel command string"
718 depends on CMDLINE_BOOL
719 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
721 On some platforms, there is currently no way for the boot loader to
722 pass arguments to the kernel. For these platforms, you can supply
723 some command-line options at build time by entering them here. In
724 most cases you will need to specify the root device here.
727 source kernel/power/Kconfig
731 bool "Enable seccomp to safely compute untrusted bytecode"
735 This kernel feature is useful for number crunching applications
736 that may need to compute untrusted bytecode during their
737 execution. By using pipes or other transports made available to
738 the process as file descriptors supporting the read/write
739 syscalls, it's possible to isolate those applications in
740 their own address space using seccomp. Once seccomp is
741 enabled via /proc/<pid>/seccomp, it cannot be disabled
742 and the task is only allowed to execute a few safe syscalls
743 defined by each seccomp mode.
745 If unsure, say Y. Only embedded should say N here.
756 bool "Support for ISA-bus hardware"
757 depends on PPC_PREP || PPC_CHRP
760 Find out whether you have ISA slots on your motherboard. ISA is the
761 name of a bus system, i.e. the way the CPU talks to the other stuff
762 inside your box. If you have an Apple machine, say N here; if you
763 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
764 you have an embedded board, consult your board documentation.
766 config GENERIC_ISA_DMA
768 depends on PPC64 || POWER4 || 6xx && !CPM2
775 config PPC_INDIRECT_PCI
778 default y if 40x || 44x
790 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
795 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
796 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx
797 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
798 default PCI_QSPAN if !4xx && !CPM2 && 8xx
800 Find out whether your system includes a PCI bus. PCI is the name of
801 a bus system, i.e. the way the CPU talks to the other stuff inside
802 your box. If you say Y here, the kernel will include drivers and
803 infrastructure code to support PCI bus devices.
811 depends on !4xx && !CPM2 && 8xx
814 Say Y here if you have a system based on a Motorola 8xx-series
815 embedded processor with a QSPAN PCI interface, otherwise say N.
819 depends on PCI && 8260
820 select PPC_INDIRECT_PCI
824 bool " Enable workaround for MPC826x erratum PCI 9"
825 depends on PCI_8260 && !ADS8272
829 prompt " IDMA channel for PCI 9 workaround"
832 config 8260_PCI9_IDMA1
835 config 8260_PCI9_IDMA2
838 config 8260_PCI9_IDMA3
841 config 8260_PCI9_IDMA4
846 source "drivers/pci/Kconfig"
848 source "drivers/pcmcia/Kconfig"
850 source "drivers/pci/hotplug/Kconfig"
854 menu "Advanced setup"
857 config ADVANCED_OPTIONS
858 bool "Prompt for advanced kernel configuration options"
860 This option will enable prompting for a variety of advanced kernel
861 configuration options. These options can cause the kernel to not
862 work if they are set incorrectly, but can be used to optimize certain
863 aspects of kernel memory management.
865 Unless you know what you are doing, say N here.
867 comment "Default settings for advanced configuration options are used"
868 depends on !ADVANCED_OPTIONS
870 config HIGHMEM_START_BOOL
871 bool "Set high memory pool address"
872 depends on ADVANCED_OPTIONS && HIGHMEM
874 This option allows you to set the base address of the kernel virtual
875 area used to map high memory pages. This can be useful in
876 optimizing the layout of kernel virtual memory.
878 Say N here unless you know what you are doing.
881 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
884 config LOWMEM_SIZE_BOOL
885 bool "Set maximum low memory"
886 depends on ADVANCED_OPTIONS
888 This option allows you to set the maximum amount of memory which
889 will be used as "low memory", that is, memory which the kernel can
890 access directly, without having to set up a kernel virtual mapping.
891 This can be useful in optimizing the layout of kernel virtual
894 Say N here unless you know what you are doing.
897 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
900 config KERNEL_START_BOOL
901 bool "Set custom kernel base address"
902 depends on ADVANCED_OPTIONS
904 This option allows you to set the kernel virtual address at which
905 the kernel will map low memory (the kernel image will be linked at
906 this address). This can be useful in optimizing the virtual memory
907 layout of the system.
909 Say N here unless you know what you are doing.
912 hex "Virtual address of kernel base" if KERNEL_START_BOOL
915 config TASK_SIZE_BOOL
916 bool "Set custom user task size"
917 depends on ADVANCED_OPTIONS
919 This option allows you to set the amount of virtual address space
920 allocated to user tasks. This can be useful in optimizing the
921 virtual memory layout of the system.
923 Say N here unless you know what you are doing.
926 hex "Size of user task space" if TASK_SIZE_BOOL
929 config CONSISTENT_START_BOOL
930 bool "Set custom consistent memory pool address"
931 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
933 This option allows you to set the base virtual address
934 of the the consistent memory pool. This pool of virtual
935 memory is used to make consistent memory allocations.
937 config CONSISTENT_START
938 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
939 default "0xff100000" if NOT_COHERENT_CACHE
941 config CONSISTENT_SIZE_BOOL
942 bool "Set custom consistent memory pool size"
943 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
945 This option allows you to set the size of the the
946 consistent memory pool. This pool of virtual memory
947 is used to make consistent memory allocations.
949 config CONSISTENT_SIZE
950 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
951 default "0x00200000" if NOT_COHERENT_CACHE
953 config BOOT_LOAD_BOOL
954 bool "Set the boot link/load address"
955 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
957 This option allows you to set the initial load address of the zImage
958 or zImage.initrd file. This can be useful if you are on a board
959 which has a small amount of memory.
961 Say N here unless you know what you are doing.
964 hex "Link/load address for booting" if BOOT_LOAD_BOOL
965 default "0x00400000" if 40x || 8xx || 8260
966 default "0x01000000" if 44x
970 bool "Pinned Kernel TLBs (860 ONLY)"
971 depends on ADVANCED_OPTIONS && 8xx
977 default "0xc000000000000000"
982 source "drivers/Kconfig"
986 # XXX source "arch/ppc/8xx_io/Kconfig"
988 # XXX source "arch/ppc/8260_io/Kconfig"
990 source "arch/powerpc/platforms/iseries/Kconfig"
994 menu "Instrumentation Support"
995 depends on EXPERIMENTAL
997 source "arch/powerpc/oprofile/Kconfig"
1000 bool "Kprobes (EXPERIMENTAL)"
1001 depends on PPC64 && EXPERIMENTAL && MODULES
1003 Kprobes allows you to trap at almost any kernel address and
1004 execute a callback function. register_kprobe() establishes
1005 a probepoint and specifies the callback. Kprobes is useful
1006 for kernel debugging, non-intrusive instrumentation and testing.
1007 If in doubt, say "N".
1010 source "arch/powerpc/Kconfig.debug"
1012 source "security/Kconfig"
1016 depends on COMPAT && KEYS
1019 source "crypto/Kconfig"