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"
359 select RTAS_ERROR_LOGGING
360 select PPC_UDBG_16550
364 bool "Common Hardware Reference Platform (CHRP) based machines"
365 depends on PPC_MULTIPLATFORM && PPC32
367 select PPC_INDIRECT_PCI
370 select PPC_UDBG_16550
374 bool "Apple PowerMac based machines"
375 depends on PPC_MULTIPLATFORM
376 select PPC_INDIRECT_PCI if PPC32
377 select PPC_MPC106 if PPC32
382 depends on PPC_PMAC && POWER4
384 select MPIC_BROKEN_U3
385 select GENERIC_TBSYNC
390 bool "PowerPC Reference Platform (PReP) based machines"
391 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
393 select PPC_INDIRECT_PCI
394 select PPC_UDBG_16550
398 depends on PPC_MULTIPLATFORM && PPC64
399 bool "Maple 970FX Evaluation Board"
401 select MPIC_BROKEN_U3
402 select GENERIC_TBSYNC
403 select PPC_UDBG_16550
407 This option enables support for the Maple 970FX Evaluation Board.
408 For more informations, refer to <http://www.970eval.com>
414 config PPC_CELL_NATIVE
419 config PPC_IBM_CELL_BLADE
420 bool "IBM Cell Blade"
421 depends on PPC_MULTIPLATFORM && PPC64
422 select PPC_CELL_NATIVE
425 select PPC_UDBG_16550
426 select UDBG_RTAS_CONSOLE
428 config UDBG_RTAS_CONSOLE
429 bool "RTAS based debug console"
434 depends on PPC_PSERIES
440 depends on PPC_MULTIPLATFORM && PPC64
444 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP \
453 config RTAS_ERROR_LOGGING
459 bool "Proc interface to RTAS"
464 tristate "Firmware flash interface"
465 depends on PPC64 && RTAS_PROC
471 config MPIC_BROKEN_U3
477 depends on PPC_PSERIES || PPC_ISERIES
482 depends on PPC_PSERIES
483 bool "Support for GX bus based adapters"
485 Bus device driver for GX bus based adapters.
495 source "drivers/cpufreq/Kconfig"
498 bool "Support for Apple PowerBooks"
499 depends on CPU_FREQ && ADB_PMU && PPC32
500 select CPU_FREQ_TABLE
502 This adds support for frequency switching on Apple PowerBooks,
503 this currently includes some models of iBook & Titanium
506 config CPU_FREQ_PMAC64
507 bool "Support for some Apple G5s"
508 depends on CPU_FREQ && PPC64
509 select CPU_FREQ_TABLE
511 This adds support for frequency switching on Apple iMac G5,
512 and some of the more recent desktop G5 machines as well.
514 config PPC601_SYNC_FIX
515 bool "Workarounds for PPC601 bugs"
516 depends on 6xx && (PPC_PREP || PPC_PMAC)
518 Some versions of the PPC601 (the first PowerPC chip) have bugs which
519 mean that extra synchronization instructions are required near
520 certain instructions, typically those that make major changes to the
521 CPU state. These extra instructions reduce performance slightly.
522 If you say N here, these extra instructions will not be included,
523 resulting in a kernel which will run faster but may not run at all
524 on some systems with the PPC601 chip.
526 If in doubt, say Y here.
529 bool "On-chip CPU temperature sensor support"
532 G3 and G4 processors have an on-chip temperature sensor called the
533 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
534 temperature within 2-4 degrees Celsius. This option shows the current
535 on-die temperature in /proc/cpuinfo if the cpu supports it.
537 Unfortunately, on some chip revisions, this sensor is very inaccurate
538 and in many cases, does not work at all, so don't assume the cpu
539 temp is actually what /proc/cpuinfo says it is.
542 bool "Interrupt driven TAU driver (DANGEROUS)"
545 The TAU supports an interrupt driven mode which causes an interrupt
546 whenever the temperature goes out of range. This is the fastest way
547 to get notified the temp has exceeded a range. With this option off,
548 a timer is used to re-check the temperature periodically.
550 However, on some cpus it appears that the TAU interrupt hardware
551 is buggy and can cause a situation which would lead unexplained hard
554 Unless you are extending the TAU driver, or enjoy kernel/hardware
555 debugging, leave this option off.
558 bool "Average high and low temp"
561 The TAU hardware can compare the temperature to an upper and lower
562 bound. The default behavior is to show both the upper and lower
563 bound in /proc/cpuinfo. If the range is large, the temperature is
564 either changing a lot, or the TAU hardware is broken (likely on some
565 G4's). If the range is small (around 4 degrees), the temperature is
566 relatively stable. If you say Y here, a single temperature value,
567 halfway between the upper and lower bounds, will be reported in
570 If in doubt, say N here.
573 depends on EMBEDDED6xx
574 bool "Generic Time-of-day Clock (TODC) support"
576 This adds support for many TODC/RTC chips.
580 source arch/powerpc/platforms/embedded6xx/Kconfig
581 source arch/powerpc/platforms/4xx/Kconfig
582 source arch/powerpc/platforms/83xx/Kconfig
583 source arch/powerpc/platforms/85xx/Kconfig
584 source arch/powerpc/platforms/86xx/Kconfig
585 source arch/powerpc/platforms/8xx/Kconfig
586 source arch/powerpc/platforms/cell/Kconfig
588 menu "Kernel options"
591 bool "High memory support"
594 source kernel/Kconfig.hz
595 source kernel/Kconfig.preempt
596 source "fs/Kconfig.binfmt"
598 # We optimistically allocate largepages from the VM, so make the limit
599 # large enough (16MB). This badly named config option is actually
601 config FORCE_MAX_ZONEORDER
604 default "9" if PPC_64K_PAGES
607 config MATH_EMULATION
608 bool "Math emulation"
609 depends on 4xx || 8xx || E200 || E500
611 Some PowerPC chips designed for embedded applications do not have
612 a floating-point unit and therefore do not implement the
613 floating-point instructions in the PowerPC instruction set. If you
614 say Y here, the kernel will include code to emulate a floating-point
615 unit, which will allow programs that use floating-point
619 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
620 depends on EXPERIMENTAL && PPC64
623 Cause IO segments sent to a device for DMA to be merged virtually
624 by the IOMMU when they happen to have been allocated contiguously.
625 This doesn't add pressure to the IOMMU allocator. However, some
626 drivers don't support getting large merged segments coming back
627 from *_map_sg(). Say Y if you know the drivers you are using are
628 properly handling this case.
631 bool "Support for enabling/disabling CPUs"
632 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
634 Say Y here to be able to disable and re-enable individual
635 CPUs at runtime on SMP machines.
637 Say N if you are unsure.
639 config ARCH_ENABLE_MEMORY_HOTPLUG
643 bool "kexec system call (EXPERIMENTAL)"
644 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
646 kexec is a system call that implements the ability to shutdown your
647 current kernel, and to start another kernel. It is like a reboot
648 but it is independent of the system firmware. And like a reboot
649 you can start any kernel with it, not just Linux.
651 The name comes from the similarity to the exec system call.
653 It is an ongoing process to be certain the hardware in a machine
654 is properly shutdown, so do not be surprised if this code does not
655 initially work for you. It may help to enable device hotplugging
656 support. As of this writing the exact hardware interface is
657 strongly in flux, so no good recommendation can be made.
660 bool "Build a kdump crash kernel (EXPERIMENTAL)"
661 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
663 Build a kernel suitable for use as a kdump capture kernel.
664 The kernel will be linked at a different address than normal, and
665 so can only be used for Kdump.
667 Don't change this unless you know what you are doing.
671 depends on 8xx || 8260
675 bool "PC PS/2 style Keyboard"
676 depends on 4xx || CPM2
679 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
680 default y if PPC_PREP
683 bool "Distribute interrupts on all CPUs by default"
684 depends on SMP && !MV64360
686 This option gives the kernel permission to distribute IRQs across
687 multiple CPUs. Saying N here will route all IRQs to the first
688 CPU. Generally saying Y is safe, although some problems have been
689 reported with SMP Power Macintoshes with this option enabled.
691 source "arch/powerpc/platforms/pseries/Kconfig"
696 default y if SMP && PPC_PSERIES
701 depends on NEED_MULTIPLE_NODES
703 config ARCH_SELECT_MEMORY_MODEL
707 config ARCH_FLATMEM_ENABLE
709 depends on (PPC64 && !NUMA) || PPC32
711 config ARCH_SPARSEMEM_ENABLE
715 config ARCH_SPARSEMEM_DEFAULT
717 depends on SMP && PPC_PSERIES
721 config HAVE_ARCH_EARLY_PFN_TO_NID
723 depends on NEED_MULTIPLE_NODES
725 config ARCH_MEMORY_PROBE
727 depends on MEMORY_HOTPLUG
733 This option changes the kernel logical page size to 64k. On machines
734 without processor support for 64k pages, the kernel will simulate
735 them by loading each individual 4k page on demand transparently,
736 while on hardware with such support, it will be used to map
737 normal application pages.
740 bool "SMT (Hyperthreading) scheduler support"
741 depends on PPC64 && SMP
743 SMT scheduler support improves the CPU scheduler's decision making
744 when dealing with POWER5 cpus at a cost of slightly increased
745 overhead in some places. If unsure say N here.
747 config PROC_DEVICETREE
748 bool "Support for device tree in /proc"
751 This option adds a device-tree directory under /proc which contains
752 an image of the device tree that the kernel copies from Open
753 Firmware or other boot firmware. If unsure, say Y here.
755 source "arch/powerpc/platforms/prep/Kconfig"
758 bool "Default bootloader kernel arguments"
759 depends on !PPC_ISERIES
762 string "Initial kernel command string"
763 depends on CMDLINE_BOOL
764 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
766 On some platforms, there is currently no way for the boot loader to
767 pass arguments to the kernel. For these platforms, you can supply
768 some command-line options at build time by entering them here. In
769 most cases you will need to specify the root device here.
772 source kernel/power/Kconfig
776 bool "Enable seccomp to safely compute untrusted bytecode"
780 This kernel feature is useful for number crunching applications
781 that may need to compute untrusted bytecode during their
782 execution. By using pipes or other transports made available to
783 the process as file descriptors supporting the read/write
784 syscalls, it's possible to isolate those applications in
785 their own address space using seccomp. Once seccomp is
786 enabled via /proc/<pid>/seccomp, it cannot be disabled
787 and the task is only allowed to execute a few safe syscalls
788 defined by each seccomp mode.
790 If unsure, say Y. Only embedded should say N here.
801 bool "Support for ISA-bus hardware"
802 depends on PPC_PREP || PPC_CHRP
805 Find out whether you have ISA slots on your motherboard. ISA is the
806 name of a bus system, i.e. the way the CPU talks to the other stuff
807 inside your box. If you have an Apple machine, say N here; if you
808 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
809 you have an embedded board, consult your board documentation.
811 config GENERIC_ISA_DMA
813 depends on PPC64 || POWER4 || 6xx && !CPM2
820 config PPC_INDIRECT_PCI
823 default y if 40x || 44x
835 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
840 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) \
842 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
843 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
844 default PCI_QSPAN if !4xx && !CPM2 && 8xx
846 Find out whether your system includes a PCI bus. PCI is the name of
847 a bus system, i.e. the way the CPU talks to the other stuff inside
848 your box. If you say Y here, the kernel will include drivers and
849 infrastructure code to support PCI bus devices.
857 depends on !4xx && !CPM2 && 8xx
860 Say Y here if you have a system based on a Motorola 8xx-series
861 embedded processor with a QSPAN PCI interface, otherwise say N.
865 depends on PCI && 8260
866 select PPC_INDIRECT_PCI
870 bool "Enable workaround for MPC826x erratum PCI 9"
871 depends on PCI_8260 && !ADS8272
875 prompt "IDMA channel for PCI 9 workaround"
878 config 8260_PCI9_IDMA1
881 config 8260_PCI9_IDMA2
884 config 8260_PCI9_IDMA3
887 config 8260_PCI9_IDMA4
892 source "drivers/pci/pcie/Kconfig"
894 source "drivers/pci/Kconfig"
896 source "drivers/pcmcia/Kconfig"
898 source "drivers/pci/hotplug/Kconfig"
902 menu "Advanced setup"
905 config ADVANCED_OPTIONS
906 bool "Prompt for advanced kernel configuration options"
908 This option will enable prompting for a variety of advanced kernel
909 configuration options. These options can cause the kernel to not
910 work if they are set incorrectly, but can be used to optimize certain
911 aspects of kernel memory management.
913 Unless you know what you are doing, say N here.
915 comment "Default settings for advanced configuration options are used"
916 depends on !ADVANCED_OPTIONS
918 config HIGHMEM_START_BOOL
919 bool "Set high memory pool address"
920 depends on ADVANCED_OPTIONS && HIGHMEM
922 This option allows you to set the base address of the kernel virtual
923 area used to map high memory pages. This can be useful in
924 optimizing the layout of kernel virtual memory.
926 Say N here unless you know what you are doing.
929 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
932 config LOWMEM_SIZE_BOOL
933 bool "Set maximum low memory"
934 depends on ADVANCED_OPTIONS
936 This option allows you to set the maximum amount of memory which
937 will be used as "low memory", that is, memory which the kernel can
938 access directly, without having to set up a kernel virtual mapping.
939 This can be useful in optimizing the layout of kernel virtual
942 Say N here unless you know what you are doing.
945 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
948 config KERNEL_START_BOOL
949 bool "Set custom kernel base address"
950 depends on ADVANCED_OPTIONS
952 This option allows you to set the kernel virtual address at which
953 the kernel will map low memory (the kernel image will be linked at
954 this address). This can be useful in optimizing the virtual memory
955 layout of the system.
957 Say N here unless you know what you are doing.
960 hex "Virtual address of kernel base" if KERNEL_START_BOOL
963 config TASK_SIZE_BOOL
964 bool "Set custom user task size"
965 depends on ADVANCED_OPTIONS
967 This option allows you to set the amount of virtual address space
968 allocated to user tasks. This can be useful in optimizing the
969 virtual memory layout of the system.
971 Say N here unless you know what you are doing.
974 hex "Size of user task space" if TASK_SIZE_BOOL
977 config CONSISTENT_START_BOOL
978 bool "Set custom consistent memory pool address"
979 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
981 This option allows you to set the base virtual address
982 of the the consistent memory pool. This pool of virtual
983 memory is used to make consistent memory allocations.
985 config CONSISTENT_START
986 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
987 default "0xff100000" if NOT_COHERENT_CACHE
989 config CONSISTENT_SIZE_BOOL
990 bool "Set custom consistent memory pool size"
991 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
993 This option allows you to set the size of the the
994 consistent memory pool. This pool of virtual memory
995 is used to make consistent memory allocations.
997 config CONSISTENT_SIZE
998 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
999 default "0x00200000" if NOT_COHERENT_CACHE
1001 config BOOT_LOAD_BOOL
1002 bool "Set the boot link/load address"
1003 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
1005 This option allows you to set the initial load address of the zImage
1006 or zImage.initrd file. This can be useful if you are on a board
1007 which has a small amount of memory.
1009 Say N here unless you know what you are doing.
1012 hex "Link/load address for booting" if BOOT_LOAD_BOOL
1013 default "0x00400000" if 40x || 8xx || 8260
1014 default "0x01000000" if 44x
1015 default "0x00800000"
1018 bool "Pinned Kernel TLBs (860 ONLY)"
1019 depends on ADVANCED_OPTIONS && 8xx
1025 default "0xc000000000000000"
1028 source "net/Kconfig"
1030 source "drivers/Kconfig"
1034 # XXX source "arch/ppc/8xx_io/Kconfig"
1036 # XXX source "arch/ppc/8260_io/Kconfig"
1038 source "arch/powerpc/platforms/iseries/Kconfig"
1040 source "lib/Kconfig"
1042 menu "Instrumentation Support"
1043 depends on EXPERIMENTAL
1045 source "arch/powerpc/oprofile/Kconfig"
1048 bool "Kprobes (EXPERIMENTAL)"
1049 depends on PPC64 && EXPERIMENTAL && MODULES
1051 Kprobes allows you to trap at almost any kernel address and
1052 execute a callback function. register_kprobe() establishes
1053 a probepoint and specifies the callback. Kprobes is useful
1054 for kernel debugging, non-intrusive instrumentation and testing.
1055 If in doubt, say "N".
1058 source "arch/powerpc/Kconfig.debug"
1060 source "security/Kconfig"
1064 depends on COMPAT && KEYS
1067 source "crypto/Kconfig"