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>
420 config PPC_CELL_NATIVE
425 config PPC_IBM_CELL_BLADE
426 bool "IBM Cell Blade"
427 depends on PPC_MULTIPLATFORM && PPC64
428 select PPC_CELL_NATIVE
431 select PPC_UDBG_16550
432 select UDBG_RTAS_CONSOLE
434 config UDBG_RTAS_CONSOLE
439 depends on PPC_PSERIES
445 depends on PPC_MULTIPLATFORM && PPC64
452 config RTAS_ERROR_LOGGING
458 bool "Proc interface to RTAS"
463 tristate "Firmware flash interface"
464 depends on PPC64 && RTAS_PROC
470 config MPIC_BROKEN_U3
476 depends on PPC_PSERIES || PPC_ISERIES
481 depends on PPC_PSERIES
482 bool "Support for GX bus based adapters"
484 Bus device driver for GX bus based adapters.
494 source "drivers/cpufreq/Kconfig"
497 bool "Support for Apple PowerBooks"
498 depends on CPU_FREQ && ADB_PMU && PPC32
499 select CPU_FREQ_TABLE
501 This adds support for frequency switching on Apple PowerBooks,
502 this currently includes some models of iBook & Titanium
505 config CPU_FREQ_PMAC64
506 bool "Support for some Apple G5s"
507 depends on CPU_FREQ && PPC64
508 select CPU_FREQ_TABLE
510 This adds support for frequency switching on Apple iMac G5,
511 and some of the more recent desktop G5 machines as well.
513 config PPC601_SYNC_FIX
514 bool "Workarounds for PPC601 bugs"
515 depends on 6xx && (PPC_PREP || PPC_PMAC)
517 Some versions of the PPC601 (the first PowerPC chip) have bugs which
518 mean that extra synchronization instructions are required near
519 certain instructions, typically those that make major changes to the
520 CPU state. These extra instructions reduce performance slightly.
521 If you say N here, these extra instructions will not be included,
522 resulting in a kernel which will run faster but may not run at all
523 on some systems with the PPC601 chip.
525 If in doubt, say Y here.
528 bool "On-chip CPU temperature sensor support"
531 G3 and G4 processors have an on-chip temperature sensor called the
532 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
533 temperature within 2-4 degrees Celsius. This option shows the current
534 on-die temperature in /proc/cpuinfo if the cpu supports it.
536 Unfortunately, on some chip revisions, this sensor is very inaccurate
537 and in many cases, does not work at all, so don't assume the cpu
538 temp is actually what /proc/cpuinfo says it is.
541 bool "Interrupt driven TAU driver (DANGEROUS)"
544 The TAU supports an interrupt driven mode which causes an interrupt
545 whenever the temperature goes out of range. This is the fastest way
546 to get notified the temp has exceeded a range. With this option off,
547 a timer is used to re-check the temperature periodically.
549 However, on some cpus it appears that the TAU interrupt hardware
550 is buggy and can cause a situation which would lead unexplained hard
553 Unless you are extending the TAU driver, or enjoy kernel/hardware
554 debugging, leave this option off.
557 bool "Average high and low temp"
560 The TAU hardware can compare the temperature to an upper and lower
561 bound. The default behavior is to show both the upper and lower
562 bound in /proc/cpuinfo. If the range is large, the temperature is
563 either changing a lot, or the TAU hardware is broken (likely on some
564 G4's). If the range is small (around 4 degrees), the temperature is
565 relatively stable. If you say Y here, a single temperature value,
566 halfway between the upper and lower bounds, will be reported in
569 If in doubt, say N here.
572 depends on EMBEDDED6xx
573 bool "Generic Time-of-day Clock (TODC) support"
575 This adds support for many TODC/RTC chips.
579 source arch/powerpc/platforms/embedded6xx/Kconfig
580 source arch/powerpc/platforms/4xx/Kconfig
581 source arch/powerpc/platforms/83xx/Kconfig
582 source arch/powerpc/platforms/85xx/Kconfig
583 source arch/powerpc/platforms/86xx/Kconfig
584 source arch/powerpc/platforms/8xx/Kconfig
585 source arch/powerpc/platforms/cell/Kconfig
587 menu "Kernel options"
590 bool "High memory support"
593 source kernel/Kconfig.hz
594 source kernel/Kconfig.preempt
595 source "fs/Kconfig.binfmt"
597 # We optimistically allocate largepages from the VM, so make the limit
598 # large enough (16MB). This badly named config option is actually
600 config FORCE_MAX_ZONEORDER
603 default "9" if PPC_64K_PAGES
606 config MATH_EMULATION
607 bool "Math emulation"
608 depends on 4xx || 8xx || E200 || E500
610 Some PowerPC chips designed for embedded applications do not have
611 a floating-point unit and therefore do not implement the
612 floating-point instructions in the PowerPC instruction set. If you
613 say Y here, the kernel will include code to emulate a floating-point
614 unit, which will allow programs that use floating-point
618 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
619 depends on EXPERIMENTAL && PPC64
622 Cause IO segments sent to a device for DMA to be merged virtually
623 by the IOMMU when they happen to have been allocated contiguously.
624 This doesn't add pressure to the IOMMU allocator. However, some
625 drivers don't support getting large merged segments coming back
626 from *_map_sg(). Say Y if you know the drivers you are using are
627 properly handling this case.
630 bool "Support for enabling/disabling CPUs"
631 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
633 Say Y here to be able to disable and re-enable individual
634 CPUs at runtime on SMP machines.
636 Say N if you are unsure.
638 config ARCH_ENABLE_MEMORY_HOTPLUG
642 bool "kexec system call (EXPERIMENTAL)"
643 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
645 kexec is a system call that implements the ability to shutdown your
646 current kernel, and to start another kernel. It is like a reboot
647 but it is independent of the system firmware. And like a reboot
648 you can start any kernel with it, not just Linux.
650 The name comes from the similarity to the exec system call.
652 It is an ongoing process to be certain the hardware in a machine
653 is properly shutdown, so do not be surprised if this code does not
654 initially work for you. It may help to enable device hotplugging
655 support. As of this writing the exact hardware interface is
656 strongly in flux, so no good recommendation can be made.
659 bool "Build a kdump crash kernel (EXPERIMENTAL)"
660 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
662 Build a kernel suitable for use as a kdump capture kernel.
663 The kernel will be linked at a different address than normal, and
664 so can only be used for Kdump.
666 Don't change this unless you know what you are doing.
670 depends on 8xx || 8260
674 bool "PC PS/2 style Keyboard"
675 depends on 4xx || CPM2
678 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
679 default y if PPC_PREP
682 bool "Distribute interrupts on all CPUs by default"
683 depends on SMP && !MV64360
685 This option gives the kernel permission to distribute IRQs across
686 multiple CPUs. Saying N here will route all IRQs to the first
687 CPU. Generally saying Y is safe, although some problems have been
688 reported with SMP Power Macintoshes with this option enabled.
690 source "arch/powerpc/platforms/pseries/Kconfig"
695 default y if SMP && PPC_PSERIES
700 depends on NEED_MULTIPLE_NODES
702 config ARCH_SELECT_MEMORY_MODEL
706 config ARCH_FLATMEM_ENABLE
708 depends on (PPC64 && !NUMA) || PPC32
710 config ARCH_SPARSEMEM_ENABLE
714 config ARCH_SPARSEMEM_DEFAULT
716 depends on SMP && PPC_PSERIES
720 config HAVE_ARCH_EARLY_PFN_TO_NID
722 depends on NEED_MULTIPLE_NODES
724 config ARCH_MEMORY_PROBE
726 depends on MEMORY_HOTPLUG
732 This option changes the kernel logical page size to 64k. On machines
733 without processor support for 64k pages, the kernel will simulate
734 them by loading each individual 4k page on demand transparently,
735 while on hardware with such support, it will be used to map
736 normal application pages.
739 bool "SMT (Hyperthreading) scheduler support"
740 depends on PPC64 && SMP
742 SMT scheduler support improves the CPU scheduler's decision making
743 when dealing with POWER5 cpus at a cost of slightly increased
744 overhead in some places. If unsure say N here.
746 config PROC_DEVICETREE
747 bool "Support for device tree in /proc"
750 This option adds a device-tree directory under /proc which contains
751 an image of the device tree that the kernel copies from Open
752 Firmware or other boot firmware. If unsure, say Y here.
754 source "arch/powerpc/platforms/prep/Kconfig"
757 bool "Default bootloader kernel arguments"
758 depends on !PPC_ISERIES
761 string "Initial kernel command string"
762 depends on CMDLINE_BOOL
763 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
765 On some platforms, there is currently no way for the boot loader to
766 pass arguments to the kernel. For these platforms, you can supply
767 some command-line options at build time by entering them here. In
768 most cases you will need to specify the root device here.
771 source kernel/power/Kconfig
775 bool "Enable seccomp to safely compute untrusted bytecode"
779 This kernel feature is useful for number crunching applications
780 that may need to compute untrusted bytecode during their
781 execution. By using pipes or other transports made available to
782 the process as file descriptors supporting the read/write
783 syscalls, it's possible to isolate those applications in
784 their own address space using seccomp. Once seccomp is
785 enabled via /proc/<pid>/seccomp, it cannot be disabled
786 and the task is only allowed to execute a few safe syscalls
787 defined by each seccomp mode.
789 If unsure, say Y. Only embedded should say N here.
800 bool "Support for ISA-bus hardware"
801 depends on PPC_PREP || PPC_CHRP
804 Find out whether you have ISA slots on your motherboard. ISA is the
805 name of a bus system, i.e. the way the CPU talks to the other stuff
806 inside your box. If you have an Apple machine, say N here; if you
807 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
808 you have an embedded board, consult your board documentation.
810 config GENERIC_ISA_DMA
812 depends on PPC64 || POWER4 || 6xx && !CPM2
827 config PPC_INDIRECT_PCI
830 default y if 40x || 44x
842 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
847 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
848 || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) || MPC7448HPC2
849 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx \
850 && !PPC_85xx && !PPC_86xx
851 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
852 default PCI_QSPAN if !4xx && !CPM2 && 8xx
854 Find out whether your system includes a PCI bus. PCI is the name of
855 a bus system, i.e. the way the CPU talks to the other stuff inside
856 your box. If you say Y here, the kernel will include drivers and
857 infrastructure code to support PCI bus devices.
865 depends on !4xx && !CPM2 && 8xx
868 Say Y here if you have a system based on a Motorola 8xx-series
869 embedded processor with a QSPAN PCI interface, otherwise say N.
873 depends on PCI && 8260
874 select PPC_INDIRECT_PCI
878 bool "Enable workaround for MPC826x erratum PCI 9"
879 depends on PCI_8260 && !ADS8272
883 prompt "IDMA channel for PCI 9 workaround"
886 config 8260_PCI9_IDMA1
889 config 8260_PCI9_IDMA2
892 config 8260_PCI9_IDMA3
895 config 8260_PCI9_IDMA4
900 source "drivers/pci/pcie/Kconfig"
902 source "drivers/pci/Kconfig"
904 source "drivers/pcmcia/Kconfig"
906 source "drivers/pci/hotplug/Kconfig"
910 menu "Advanced setup"
913 config ADVANCED_OPTIONS
914 bool "Prompt for advanced kernel configuration options"
916 This option will enable prompting for a variety of advanced kernel
917 configuration options. These options can cause the kernel to not
918 work if they are set incorrectly, but can be used to optimize certain
919 aspects of kernel memory management.
921 Unless you know what you are doing, say N here.
923 comment "Default settings for advanced configuration options are used"
924 depends on !ADVANCED_OPTIONS
926 config HIGHMEM_START_BOOL
927 bool "Set high memory pool address"
928 depends on ADVANCED_OPTIONS && HIGHMEM
930 This option allows you to set the base address of the kernel virtual
931 area used to map high memory pages. This can be useful in
932 optimizing the layout of kernel virtual memory.
934 Say N here unless you know what you are doing.
937 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
940 config LOWMEM_SIZE_BOOL
941 bool "Set maximum low memory"
942 depends on ADVANCED_OPTIONS
944 This option allows you to set the maximum amount of memory which
945 will be used as "low memory", that is, memory which the kernel can
946 access directly, without having to set up a kernel virtual mapping.
947 This can be useful in optimizing the layout of kernel virtual
950 Say N here unless you know what you are doing.
953 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
956 config KERNEL_START_BOOL
957 bool "Set custom kernel base address"
958 depends on ADVANCED_OPTIONS
960 This option allows you to set the kernel virtual address at which
961 the kernel will map low memory (the kernel image will be linked at
962 this address). This can be useful in optimizing the virtual memory
963 layout of the system.
965 Say N here unless you know what you are doing.
968 hex "Virtual address of kernel base" if KERNEL_START_BOOL
971 config TASK_SIZE_BOOL
972 bool "Set custom user task size"
973 depends on ADVANCED_OPTIONS
975 This option allows you to set the amount of virtual address space
976 allocated to user tasks. This can be useful in optimizing the
977 virtual memory layout of the system.
979 Say N here unless you know what you are doing.
982 hex "Size of user task space" if TASK_SIZE_BOOL
985 config CONSISTENT_START_BOOL
986 bool "Set custom consistent memory pool address"
987 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
989 This option allows you to set the base virtual address
990 of the the consistent memory pool. This pool of virtual
991 memory is used to make consistent memory allocations.
993 config CONSISTENT_START
994 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
995 default "0xff100000" if NOT_COHERENT_CACHE
997 config CONSISTENT_SIZE_BOOL
998 bool "Set custom consistent memory pool size"
999 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1001 This option allows you to set the size of the the
1002 consistent memory pool. This pool of virtual memory
1003 is used to make consistent memory allocations.
1005 config CONSISTENT_SIZE
1006 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1007 default "0x00200000" if NOT_COHERENT_CACHE
1009 config BOOT_LOAD_BOOL
1010 bool "Set the boot link/load address"
1011 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1013 This option allows you to set the initial load address of the zImage
1014 or zImage.initrd file. This can be useful if you are on a board
1015 which has a small amount of memory.
1017 Say N here unless you know what you are doing.
1020 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1021 default "0x00400000" if 40x || 8xx || 8260
1022 default "0x01000000" if 44x
1023 default "0x00800000"
1026 bool "Pinned Kernel TLBs (860 ONLY)"
1027 depends on ADVANCED_OPTIONS && 8xx
1033 default "0xc000000000000000"
1036 source "net/Kconfig"
1038 source "drivers/Kconfig"
1042 # XXX source "arch/ppc/8xx_io/Kconfig"
1044 # XXX source "arch/ppc/8260_io/Kconfig"
1046 source "arch/powerpc/platforms/iseries/Kconfig"
1048 source "lib/Kconfig"
1050 menu "Instrumentation Support"
1051 depends on EXPERIMENTAL
1053 source "arch/powerpc/oprofile/Kconfig"
1056 bool "Kprobes (EXPERIMENTAL)"
1057 depends on PPC64 && EXPERIMENTAL && MODULES
1059 Kprobes allows you to trap at almost any kernel address and
1060 execute a callback function. register_kprobe() establishes
1061 a probepoint and specifies the callback. Kprobes is useful
1062 for kernel debugging, non-intrusive instrumentation and testing.
1063 If in doubt, say "N".
1066 source "arch/powerpc/Kconfig.debug"
1068 source "security/Kconfig"
1072 depends on COMPAT && KEYS
1075 source "crypto/Kconfig"