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
37 config RWSEM_GENERIC_SPINLOCK
40 config RWSEM_XCHGADD_ALGORITHM
44 config GENERIC_HWEIGHT
48 config GENERIC_CALIBRATE_DELAY
52 config GENERIC_FIND_NEXT_BIT
70 depends on COMPAT && SYSVIPC
73 # All PPC32s use generic nvram driver through ppc_md
78 config SCHED_NO_NO_OMIT_FRAME_POINTER
82 config ARCH_MAY_HAVE_PC_FDC
95 default y if PPC32 && SMP
101 Used to allow a board to specify it wants a uImage built by default
104 menu "Processor support"
106 prompt "Processor Type"
115 There are four families of PowerPC chips supported. The more common
116 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
117 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
118 embedded versions (403 and 405) and the high end 64 bit Power
119 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
121 Unless you are building a kernel for one of the embedded processor
122 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
123 Note that the kernel runs in 32-bit mode even on 64-bit chips.
126 bool "Freescale 52xx"
131 bool "Freescale 82xx"
136 bool "Freescale 83xx"
143 bool "Freescale 85xx"
149 bool "Freescale 86xx"
155 The Freescale E600 SoCs have 74xx cores.
167 bool "Freescale e200"
172 bool "Optimize for POWER4"
176 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
177 The resulting binary will not work on POWER3 or RS64 processors
178 when compiled with binutils 2.15 or later.
183 default y if !POWER4_ONLY
192 # this is temp to handle compat with arch=ppc
196 # this is temp to handle compat with arch=ppc
209 depends on E200 || E500
214 depends on E200 || E500
219 depends on 44x || E500
221 default y if E500 && PHYS_64BIT
224 bool 'Large physical address support' if E500
225 depends on 44x || E500
228 This option enables kernel support for larger than 32-bit physical
229 addresses. This features is not be available on all e500 cores.
231 If in doubt, say N here.
234 bool "AltiVec Support"
235 depends on CLASSIC32 || POWER4
237 This option enables kernel support for the Altivec extensions to the
238 PowerPC processor. The kernel currently supports saving and restoring
239 altivec registers, and turning on the 'altivec enable' bit so user
240 processes can execute altivec instructions.
242 This option is only usefully if you have a processor that supports
243 altivec (G4, otherwise known as 74xx series), but does not have
244 any affect on a non-altivec cpu (it does, however add code to the
247 If in doubt, say Y here.
251 depends on E200 || E500
254 This option enables kernel support for the Signal Processing
255 Extensions (SPE) to the PowerPC processor. The kernel currently
256 supports saving and restoring SPE registers, and turning on the
257 'spe enable' bit so user processes can execute SPE instructions.
259 This option is only useful if you have a processor that supports
260 SPE (e500, otherwise known as 85xx series), but does not have any
261 effect on a non-spe cpu (it does, however add code to the kernel).
263 If in doubt, say Y here.
267 depends on 6xx || POWER3 || POWER4 || PPC64
270 config PPC_STD_MMU_32
272 depends on PPC_STD_MMU && PPC32
274 config VIRT_CPU_ACCOUNTING
275 bool "Deterministic task and CPU time accounting"
279 Select this option to enable more accurate task and CPU time
280 accounting. This is done by reading a CPU counter on each
281 kernel entry and exit and on transitions within the kernel
282 between system, softirq and hardirq state, so there is a
283 small performance impact. This also enables accounting of
284 stolen time on logically-partitioned systems running on
285 IBM POWER5-based machines.
287 If in doubt, say Y here.
290 depends on PPC_STD_MMU
291 bool "Symmetric multi-processing support"
293 This enables support for systems with more than one CPU. If you have
294 a system with only one CPU, say N. If you have a system with more
295 than one CPU, say Y. Note that the kernel does not currently
296 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
297 since they have inadequate hardware support for multiprocessor
300 If you say N here, the kernel will run on single and multiprocessor
301 machines, but will use only one CPU of a multiprocessor machine. If
302 you say Y here, the kernel will run on single-processor machines.
303 On a single-processor machine, the kernel will run faster if you say
306 If you don't know what to do here, say N.
309 int "Maximum number of CPUs (2-128)"
312 default "32" if PPC64
315 config NOT_COHERENT_CACHE
317 depends on 4xx || 8xx || E200
321 source "init/Kconfig"
323 menu "Platform support"
324 depends on PPC64 || CLASSIC32
327 prompt "Machine type"
328 default PPC_MULTIPLATFORM
330 config PPC_MULTIPLATFORM
331 bool "Generic desktop/server/laptop"
333 Select this option if configuring for an IBM pSeries or
334 RS/6000 machine, an Apple machine, or a PReP, CHRP,
335 Maple or Cell-based machine.
338 bool "IBM Legacy iSeries"
342 bool "Embedded 6xx/7xx/7xxx-based board"
343 depends on PPC32 && (BROKEN||BROKEN_ON_SMP)
347 depends on PPC32 && BROKEN
349 Select APUS if configuring for a PowerUP Amiga.
350 More information is available at:
351 <http://linux-apus.sourceforge.net/>.
355 depends on PPC_MULTIPLATFORM && PPC64
356 bool "IBM pSeries & new (POWER5-based) iSeries"
360 select RTAS_ERROR_LOGGING
361 select PPC_UDBG_16550
365 bool "Common Hardware Reference Platform (CHRP) based machines"
366 depends on PPC_MULTIPLATFORM && PPC32
369 select PPC_INDIRECT_PCI
372 select PPC_UDBG_16550
376 bool "Apple PowerMac based machines"
377 depends on PPC_MULTIPLATFORM
379 select PPC_INDIRECT_PCI if PPC32
380 select PPC_MPC106 if PPC32
385 depends on PPC_PMAC && POWER4
388 select MPIC_BROKEN_U3
389 select GENERIC_TBSYNC
394 bool "PowerPC Reference Platform (PReP) based machines"
395 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
398 select PPC_INDIRECT_PCI
399 select PPC_UDBG_16550
403 depends on PPC_MULTIPLATFORM && PPC64
404 bool "Maple 970FX Evaluation Board"
407 select MPIC_BROKEN_U3
408 select GENERIC_TBSYNC
409 select PPC_UDBG_16550
413 This option enables support for the Maple 970FX Evaluation Board.
414 For more informations, refer to <http://www.970eval.com>
417 depends on PPC_MULTIPLATFORM && PPC64
418 bool "PA Semi SoC-based platforms"
421 select PPC_UDBG_16550
422 select GENERIC_TBSYNC
424 This option enables support for PA Semi's PWRficient line
425 of SoC processors, including PA6T-1682M
431 config PPC_CELL_NATIVE
436 config PPC_IBM_CELL_BLADE
437 bool "IBM Cell Blade"
438 depends on PPC_MULTIPLATFORM && PPC64
439 select PPC_CELL_NATIVE
442 select PPC_UDBG_16550
443 select UDBG_RTAS_CONSOLE
445 config UDBG_RTAS_CONSOLE
446 bool "RTAS based debug console"
451 depends on PPC_PSERIES
457 depends on PPC_MULTIPLATFORM && PPC64
464 config RTAS_ERROR_LOGGING
470 bool "Proc interface to RTAS"
475 tristate "Firmware flash interface"
476 depends on PPC64 && RTAS_PROC
482 config MPIC_BROKEN_U3
488 depends on PPC_PSERIES || PPC_ISERIES
493 depends on PPC_PSERIES
494 bool "Support for GX bus based adapters"
496 Bus device driver for GX bus based adapters.
506 source "drivers/cpufreq/Kconfig"
509 bool "Support for Apple PowerBooks"
510 depends on CPU_FREQ && ADB_PMU && PPC32
511 select CPU_FREQ_TABLE
513 This adds support for frequency switching on Apple PowerBooks,
514 this currently includes some models of iBook & Titanium
517 config CPU_FREQ_PMAC64
518 bool "Support for some Apple G5s"
519 depends on CPU_FREQ && PPC64
520 select CPU_FREQ_TABLE
522 This adds support for frequency switching on Apple iMac G5,
523 and some of the more recent desktop G5 machines as well.
525 config PPC601_SYNC_FIX
526 bool "Workarounds for PPC601 bugs"
527 depends on 6xx && (PPC_PREP || PPC_PMAC)
529 Some versions of the PPC601 (the first PowerPC chip) have bugs which
530 mean that extra synchronization instructions are required near
531 certain instructions, typically those that make major changes to the
532 CPU state. These extra instructions reduce performance slightly.
533 If you say N here, these extra instructions will not be included,
534 resulting in a kernel which will run faster but may not run at all
535 on some systems with the PPC601 chip.
537 If in doubt, say Y here.
540 bool "On-chip CPU temperature sensor support"
543 G3 and G4 processors have an on-chip temperature sensor called the
544 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
545 temperature within 2-4 degrees Celsius. This option shows the current
546 on-die temperature in /proc/cpuinfo if the cpu supports it.
548 Unfortunately, on some chip revisions, this sensor is very inaccurate
549 and in many cases, does not work at all, so don't assume the cpu
550 temp is actually what /proc/cpuinfo says it is.
553 bool "Interrupt driven TAU driver (DANGEROUS)"
556 The TAU supports an interrupt driven mode which causes an interrupt
557 whenever the temperature goes out of range. This is the fastest way
558 to get notified the temp has exceeded a range. With this option off,
559 a timer is used to re-check the temperature periodically.
561 However, on some cpus it appears that the TAU interrupt hardware
562 is buggy and can cause a situation which would lead unexplained hard
565 Unless you are extending the TAU driver, or enjoy kernel/hardware
566 debugging, leave this option off.
569 bool "Average high and low temp"
572 The TAU hardware can compare the temperature to an upper and lower
573 bound. The default behavior is to show both the upper and lower
574 bound in /proc/cpuinfo. If the range is large, the temperature is
575 either changing a lot, or the TAU hardware is broken (likely on some
576 G4's). If the range is small (around 4 degrees), the temperature is
577 relatively stable. If you say Y here, a single temperature value,
578 halfway between the upper and lower bounds, will be reported in
581 If in doubt, say N here.
584 depends on EMBEDDED6xx
585 bool "Generic Time-of-day Clock (TODC) support"
587 This adds support for many TODC/RTC chips.
591 source arch/powerpc/platforms/embedded6xx/Kconfig
592 source arch/powerpc/platforms/4xx/Kconfig
593 source arch/powerpc/platforms/83xx/Kconfig
594 source arch/powerpc/platforms/85xx/Kconfig
595 source arch/powerpc/platforms/86xx/Kconfig
596 source arch/powerpc/platforms/8xx/Kconfig
597 source arch/powerpc/platforms/cell/Kconfig
599 menu "Kernel options"
602 bool "High memory support"
605 source kernel/Kconfig.hz
606 source kernel/Kconfig.preempt
607 source "fs/Kconfig.binfmt"
609 # We optimistically allocate largepages from the VM, so make the limit
610 # large enough (16MB). This badly named config option is actually
612 config FORCE_MAX_ZONEORDER
615 default "9" if PPC_64K_PAGES
618 config MATH_EMULATION
619 bool "Math emulation"
620 depends on 4xx || 8xx || E200 || E500
622 Some PowerPC chips designed for embedded applications do not have
623 a floating-point unit and therefore do not implement the
624 floating-point instructions in the PowerPC instruction set. If you
625 say Y here, the kernel will include code to emulate a floating-point
626 unit, which will allow programs that use floating-point
630 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
631 depends on EXPERIMENTAL && PPC64
634 Cause IO segments sent to a device for DMA to be merged virtually
635 by the IOMMU when they happen to have been allocated contiguously.
636 This doesn't add pressure to the IOMMU allocator. However, some
637 drivers don't support getting large merged segments coming back
638 from *_map_sg(). Say Y if you know the drivers you are using are
639 properly handling this case.
642 bool "Support for enabling/disabling CPUs"
643 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
645 Say Y here to be able to disable and re-enable individual
646 CPUs at runtime on SMP machines.
648 Say N if you are unsure.
650 config ARCH_ENABLE_MEMORY_HOTPLUG
654 bool "kexec system call (EXPERIMENTAL)"
655 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
657 kexec is a system call that implements the ability to shutdown your
658 current kernel, and to start another kernel. It is like a reboot
659 but it is independent of the system firmware. And like a reboot
660 you can start any kernel with it, not just Linux.
662 The name comes from the similarity to the exec system call.
664 It is an ongoing process to be certain the hardware in a machine
665 is properly shutdown, so do not be surprised if this code does not
666 initially work for you. It may help to enable device hotplugging
667 support. As of this writing the exact hardware interface is
668 strongly in flux, so no good recommendation can be made.
671 bool "Build a kdump crash kernel (EXPERIMENTAL)"
672 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
674 Build a kernel suitable for use as a kdump capture kernel.
675 The kernel will be linked at a different address than normal, and
676 so can only be used for Kdump.
678 Don't change this unless you know what you are doing.
682 depends on 8xx || 8260
686 bool "PC PS/2 style Keyboard"
687 depends on 4xx || CPM2
690 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
691 default y if PPC_PREP
694 bool "Distribute interrupts on all CPUs by default"
695 depends on SMP && !MV64360
697 This option gives the kernel permission to distribute IRQs across
698 multiple CPUs. Saying N here will route all IRQs to the first
699 CPU. Generally saying Y is safe, although some problems have been
700 reported with SMP Power Macintoshes with this option enabled.
702 source "arch/powerpc/platforms/pseries/Kconfig"
707 default y if SMP && PPC_PSERIES
712 depends on NEED_MULTIPLE_NODES
714 config ARCH_SELECT_MEMORY_MODEL
718 config ARCH_FLATMEM_ENABLE
720 depends on (PPC64 && !NUMA) || PPC32
722 config ARCH_SPARSEMEM_ENABLE
726 config ARCH_SPARSEMEM_DEFAULT
728 depends on SMP && PPC_PSERIES
732 config HAVE_ARCH_EARLY_PFN_TO_NID
734 depends on NEED_MULTIPLE_NODES
736 config ARCH_MEMORY_PROBE
738 depends on MEMORY_HOTPLUG
744 This option changes the kernel logical page size to 64k. On machines
745 without processor support for 64k pages, the kernel will simulate
746 them by loading each individual 4k page on demand transparently,
747 while on hardware with such support, it will be used to map
748 normal application pages.
751 bool "SMT (Hyperthreading) scheduler support"
752 depends on PPC64 && SMP
754 SMT scheduler support improves the CPU scheduler's decision making
755 when dealing with POWER5 cpus at a cost of slightly increased
756 overhead in some places. If unsure say N here.
758 config PROC_DEVICETREE
759 bool "Support for device tree in /proc"
762 This option adds a device-tree directory under /proc which contains
763 an image of the device tree that the kernel copies from Open
764 Firmware or other boot firmware. If unsure, say Y here.
766 source "arch/powerpc/platforms/prep/Kconfig"
769 bool "Default bootloader kernel arguments"
770 depends on !PPC_ISERIES
773 string "Initial kernel command string"
774 depends on CMDLINE_BOOL
775 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
777 On some platforms, there is currently no way for the boot loader to
778 pass arguments to the kernel. For these platforms, you can supply
779 some command-line options at build time by entering them here. In
780 most cases you will need to specify the root device here.
783 source kernel/power/Kconfig
787 bool "Enable seccomp to safely compute untrusted bytecode"
791 This kernel feature is useful for number crunching applications
792 that may need to compute untrusted bytecode during their
793 execution. By using pipes or other transports made available to
794 the process as file descriptors supporting the read/write
795 syscalls, it's possible to isolate those applications in
796 their own address space using seccomp. Once seccomp is
797 enabled via /proc/<pid>/seccomp, it cannot be disabled
798 and the task is only allowed to execute a few safe syscalls
799 defined by each seccomp mode.
801 If unsure, say Y. Only embedded should say N here.
812 bool "Support for ISA-bus hardware"
813 depends on PPC_PREP || PPC_CHRP
816 Find out whether you have ISA slots on your motherboard. ISA is the
817 name of a bus system, i.e. the way the CPU talks to the other stuff
818 inside your box. If you have an Apple machine, say N here; if you
819 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
820 you have an embedded board, consult your board documentation.
822 config GENERIC_ISA_DMA
824 depends on PPC64 || POWER4 || 6xx && !CPM2
839 config PPC_INDIRECT_PCI
842 default y if 40x || 44x
854 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
859 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
860 || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) || MPC7448HPC2
861 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
862 && !PPC_85xx && !PPC_86xx
863 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
864 default PCI_QSPAN if !4xx && !CPM2 && 8xx
866 Find out whether your system includes a PCI bus. PCI is the name of
867 a bus system, i.e. the way the CPU talks to the other stuff inside
868 your box. If you say Y here, the kernel will include drivers and
869 infrastructure code to support PCI bus devices.
877 depends on !4xx && !CPM2 && 8xx
880 Say Y here if you have a system based on a Motorola 8xx-series
881 embedded processor with a QSPAN PCI interface, otherwise say N.
885 depends on PCI && 8260
886 select PPC_INDIRECT_PCI
890 bool "Enable workaround for MPC826x erratum PCI 9"
891 depends on PCI_8260 && !ADS8272
895 prompt "IDMA channel for PCI 9 workaround"
898 config 8260_PCI9_IDMA1
901 config 8260_PCI9_IDMA2
904 config 8260_PCI9_IDMA3
907 config 8260_PCI9_IDMA4
912 source "drivers/pci/pcie/Kconfig"
914 source "drivers/pci/Kconfig"
916 source "drivers/pcmcia/Kconfig"
918 source "drivers/pci/hotplug/Kconfig"
922 menu "Advanced setup"
925 config ADVANCED_OPTIONS
926 bool "Prompt for advanced kernel configuration options"
928 This option will enable prompting for a variety of advanced kernel
929 configuration options. These options can cause the kernel to not
930 work if they are set incorrectly, but can be used to optimize certain
931 aspects of kernel memory management.
933 Unless you know what you are doing, say N here.
935 comment "Default settings for advanced configuration options are used"
936 depends on !ADVANCED_OPTIONS
938 config HIGHMEM_START_BOOL
939 bool "Set high memory pool address"
940 depends on ADVANCED_OPTIONS && HIGHMEM
942 This option allows you to set the base address of the kernel virtual
943 area used to map high memory pages. This can be useful in
944 optimizing the layout of kernel virtual memory.
946 Say N here unless you know what you are doing.
949 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
952 config LOWMEM_SIZE_BOOL
953 bool "Set maximum low memory"
954 depends on ADVANCED_OPTIONS
956 This option allows you to set the maximum amount of memory which
957 will be used as "low memory", that is, memory which the kernel can
958 access directly, without having to set up a kernel virtual mapping.
959 This can be useful in optimizing the layout of kernel virtual
962 Say N here unless you know what you are doing.
965 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
968 config KERNEL_START_BOOL
969 bool "Set custom kernel base address"
970 depends on ADVANCED_OPTIONS
972 This option allows you to set the kernel virtual address at which
973 the kernel will map low memory (the kernel image will be linked at
974 this address). This can be useful in optimizing the virtual memory
975 layout of the system.
977 Say N here unless you know what you are doing.
980 hex "Virtual address of kernel base" if KERNEL_START_BOOL
983 config TASK_SIZE_BOOL
984 bool "Set custom user task size"
985 depends on ADVANCED_OPTIONS
987 This option allows you to set the amount of virtual address space
988 allocated to user tasks. This can be useful in optimizing the
989 virtual memory layout of the system.
991 Say N here unless you know what you are doing.
994 hex "Size of user task space" if TASK_SIZE_BOOL
997 config CONSISTENT_START_BOOL
998 bool "Set custom consistent memory pool address"
999 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1001 This option allows you to set the base virtual address
1002 of the the consistent memory pool. This pool of virtual
1003 memory is used to make consistent memory allocations.
1005 config CONSISTENT_START
1006 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
1007 default "0xff100000" if NOT_COHERENT_CACHE
1009 config CONSISTENT_SIZE_BOOL
1010 bool "Set custom consistent memory pool size"
1011 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1013 This option allows you to set the size of the the
1014 consistent memory pool. This pool of virtual memory
1015 is used to make consistent memory allocations.
1017 config CONSISTENT_SIZE
1018 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1019 default "0x00200000" if NOT_COHERENT_CACHE
1021 config BOOT_LOAD_BOOL
1022 bool "Set the boot link/load address"
1023 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1025 This option allows you to set the initial load address of the zImage
1026 or zImage.initrd file. This can be useful if you are on a board
1027 which has a small amount of memory.
1029 Say N here unless you know what you are doing.
1032 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1033 default "0x00400000" if 40x || 8xx || 8260
1034 default "0x01000000" if 44x
1035 default "0x00800000"
1038 bool "Pinned Kernel TLBs (860 ONLY)"
1039 depends on ADVANCED_OPTIONS && 8xx
1045 default "0xc000000000000000"
1048 source "net/Kconfig"
1050 source "drivers/Kconfig"
1054 # XXX source "arch/ppc/8xx_io/Kconfig"
1056 # XXX source "arch/ppc/8260_io/Kconfig"
1058 source "arch/powerpc/platforms/iseries/Kconfig"
1060 source "lib/Kconfig"
1062 menu "Instrumentation Support"
1063 depends on EXPERIMENTAL
1065 source "arch/powerpc/oprofile/Kconfig"
1068 bool "Kprobes (EXPERIMENTAL)"
1069 depends on PPC64 && EXPERIMENTAL && MODULES
1071 Kprobes allows you to trap at almost any kernel address and
1072 execute a callback function. register_kprobe() establishes
1073 a probepoint and specifies the callback. Kprobes is useful
1074 for kernel debugging, non-intrusive instrumentation and testing.
1075 If in doubt, say "N".
1078 source "arch/powerpc/Kconfig.debug"
1080 source "security/Kconfig"
1084 depends on COMPAT && KEYS
1087 source "crypto/Kconfig"