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
48 config GENERIC_FIND_NEXT_BIT
66 depends on COMPAT && SYSVIPC
69 # All PPC32s use generic nvram driver through ppc_md
74 config SCHED_NO_NO_OMIT_FRAME_POINTER
78 config ARCH_MAY_HAVE_PC_FDC
91 default y if PPC32 && SMP
97 Used to allow a board to specify it wants a uImage built by default
100 menu "Processor support"
102 prompt "Processor Type"
111 There are four families of PowerPC chips supported. The more common
112 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
113 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
114 embedded versions (403 and 405) and the high end 64 bit Power
115 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
117 Unless you are building a kernel for one of the embedded processor
118 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
119 Note that the kernel runs in 32-bit mode even on 64-bit chips.
122 bool "Freescale 52xx"
127 bool "Freescale 82xx"
132 bool "Freescale 83xx"
139 bool "Freescale 85xx"
145 bool "Freescale 86xx"
151 The Freescale E600 SoCs have 74xx cores.
163 bool "Freescale e200"
168 bool "Optimize for POWER4"
172 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
173 The resulting binary will not work on POWER3 or RS64 processors
174 when compiled with binutils 2.15 or later.
179 default y if !POWER4_ONLY
188 # this is temp to handle compat with arch=ppc
192 # this is temp to handle compat with arch=ppc
205 depends on E200 || E500
210 depends on E200 || E500
215 depends on 44x || E500
217 default y if E500 && PHYS_64BIT
220 bool 'Large physical address support' if E500
221 depends on 44x || E500
224 This option enables kernel support for larger than 32-bit physical
225 addresses. This features is not be available on all e500 cores.
227 If in doubt, say N here.
230 bool "AltiVec Support"
231 depends on CLASSIC32 || POWER4
233 This option enables kernel support for the Altivec extensions to the
234 PowerPC processor. The kernel currently supports saving and restoring
235 altivec registers, and turning on the 'altivec enable' bit so user
236 processes can execute altivec instructions.
238 This option is only usefully if you have a processor that supports
239 altivec (G4, otherwise known as 74xx series), but does not have
240 any affect on a non-altivec cpu (it does, however add code to the
243 If in doubt, say Y here.
247 depends on E200 || E500
250 This option enables kernel support for the Signal Processing
251 Extensions (SPE) to the PowerPC processor. The kernel currently
252 supports saving and restoring SPE registers, and turning on the
253 'spe enable' bit so user processes can execute SPE instructions.
255 This option is only useful if you have a processor that supports
256 SPE (e500, otherwise known as 85xx series), but does not have any
257 effect on a non-spe cpu (it does, however add code to the kernel).
259 If in doubt, say Y here.
263 depends on 6xx || POWER3 || POWER4 || PPC64
266 config PPC_STD_MMU_32
268 depends on PPC_STD_MMU && PPC32
270 config VIRT_CPU_ACCOUNTING
271 bool "Deterministic task and CPU time accounting"
275 Select this option to enable more accurate task and CPU time
276 accounting. This is done by reading a CPU counter on each
277 kernel entry and exit and on transitions within the kernel
278 between system, softirq and hardirq state, so there is a
279 small performance impact. This also enables accounting of
280 stolen time on logically-partitioned systems running on
281 IBM POWER5-based machines.
283 If in doubt, say Y here.
286 depends on PPC_STD_MMU
287 bool "Symmetric multi-processing support"
289 This enables support for systems with more than one CPU. If you have
290 a system with only one CPU, say N. If you have a system with more
291 than one CPU, say Y. Note that the kernel does not currently
292 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
293 since they have inadequate hardware support for multiprocessor
296 If you say N here, the kernel will run on single and multiprocessor
297 machines, but will use only one CPU of a multiprocessor machine. If
298 you say Y here, the kernel will run on single-processor machines.
299 On a single-processor machine, the kernel will run faster if you say
302 If you don't know what to do here, say N.
305 int "Maximum number of CPUs (2-128)"
308 default "32" if PPC64
311 config NOT_COHERENT_CACHE
313 depends on 4xx || 8xx || E200
317 source "init/Kconfig"
319 menu "Platform support"
320 depends on PPC64 || CLASSIC32
323 prompt "Machine type"
324 default PPC_MULTIPLATFORM
326 config PPC_MULTIPLATFORM
327 bool "Generic desktop/server/laptop"
329 Select this option if configuring for an IBM pSeries or
330 RS/6000 machine, an Apple machine, or a PReP, CHRP,
331 Maple or Cell-based machine.
334 bool "IBM Legacy iSeries"
338 bool "Embedded 6xx/7xx/7xxx-based board"
339 depends on PPC32 && BROKEN
343 depends on PPC32 && BROKEN
345 Select APUS if configuring for a PowerUP Amiga.
346 More information is available at:
347 <http://linux-apus.sourceforge.net/>.
351 depends on PPC_MULTIPLATFORM && PPC64
352 bool "IBM pSeries & new (POWER5-based) iSeries"
355 select RTAS_ERROR_LOGGING
356 select PPC_UDBG_16550
360 bool "Common Hardware Reference Platform (CHRP) based machines"
361 depends on PPC_MULTIPLATFORM && PPC32
363 select PPC_INDIRECT_PCI
366 select PPC_UDBG_16550
370 bool "Apple PowerMac based machines"
371 depends on PPC_MULTIPLATFORM
372 select PPC_INDIRECT_PCI if PPC32
373 select PPC_MPC106 if PPC32
378 depends on PPC_PMAC && POWER4
380 select MPIC_BROKEN_U3
381 select GENERIC_TBSYNC
386 bool "PowerPC Reference Platform (PReP) based machines"
387 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
389 select PPC_INDIRECT_PCI
390 select PPC_UDBG_16550
394 depends on PPC_MULTIPLATFORM && PPC64
395 bool "Maple 970FX Evaluation Board"
397 select MPIC_BROKEN_U3
398 select GENERIC_TBSYNC
399 select PPC_UDBG_16550
403 This option enables support for the Maple 970FX Evaluation Board.
404 For more informations, refer to <http://www.970eval.com>
410 config PPC_CELL_NATIVE
415 config PPC_IBM_CELL_BLADE
416 bool " IBM Cell Blade"
417 depends on PPC_MULTIPLATFORM && PPC64
418 select PPC_CELL_NATIVE
421 select PPC_UDBG_16550
424 depends on PPC_PSERIES
430 depends on PPC_MULTIPLATFORM && PPC64
434 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
442 config RTAS_ERROR_LOGGING
448 bool "Proc interface to RTAS"
453 tristate "Firmware flash interface"
454 depends on PPC64 && RTAS_PROC
460 config MPIC_BROKEN_U3
466 depends on PPC_PSERIES || PPC_ISERIES
471 depends on PPC_PSERIES
472 bool "Support for GX bus based adapters"
474 Bus device driver for GX bus based adapters.
484 source "drivers/cpufreq/Kconfig"
487 bool "Support for Apple PowerBooks"
488 depends on CPU_FREQ && ADB_PMU && PPC32
489 select CPU_FREQ_TABLE
491 This adds support for frequency switching on Apple PowerBooks,
492 this currently includes some models of iBook & Titanium
495 config CPU_FREQ_PMAC64
496 bool "Support for some Apple G5s"
497 depends on CPU_FREQ && PMAC_SMU && PPC64
498 select CPU_FREQ_TABLE
500 This adds support for frequency switching on Apple iMac G5,
501 and some of the more recent desktop G5 machines as well.
503 config PPC601_SYNC_FIX
504 bool "Workarounds for PPC601 bugs"
505 depends on 6xx && (PPC_PREP || PPC_PMAC)
507 Some versions of the PPC601 (the first PowerPC chip) have bugs which
508 mean that extra synchronization instructions are required near
509 certain instructions, typically those that make major changes to the
510 CPU state. These extra instructions reduce performance slightly.
511 If you say N here, these extra instructions will not be included,
512 resulting in a kernel which will run faster but may not run at all
513 on some systems with the PPC601 chip.
515 If in doubt, say Y here.
518 bool "On-chip CPU temperature sensor support"
521 G3 and G4 processors have an on-chip temperature sensor called the
522 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
523 temperature within 2-4 degrees Celsius. This option shows the current
524 on-die temperature in /proc/cpuinfo if the cpu supports it.
526 Unfortunately, on some chip revisions, this sensor is very inaccurate
527 and in many cases, does not work at all, so don't assume the cpu
528 temp is actually what /proc/cpuinfo says it is.
531 bool "Interrupt driven TAU driver (DANGEROUS)"
534 The TAU supports an interrupt driven mode which causes an interrupt
535 whenever the temperature goes out of range. This is the fastest way
536 to get notified the temp has exceeded a range. With this option off,
537 a timer is used to re-check the temperature periodically.
539 However, on some cpus it appears that the TAU interrupt hardware
540 is buggy and can cause a situation which would lead unexplained hard
543 Unless you are extending the TAU driver, or enjoy kernel/hardware
544 debugging, leave this option off.
547 bool "Average high and low temp"
550 The TAU hardware can compare the temperature to an upper and lower
551 bound. The default behavior is to show both the upper and lower
552 bound in /proc/cpuinfo. If the range is large, the temperature is
553 either changing a lot, or the TAU hardware is broken (likely on some
554 G4's). If the range is small (around 4 degrees), the temperature is
555 relatively stable. If you say Y here, a single temperature value,
556 halfway between the upper and lower bounds, will be reported in
559 If in doubt, say N here.
562 source arch/powerpc/platforms/embedded6xx/Kconfig
563 source arch/powerpc/platforms/4xx/Kconfig
564 source arch/powerpc/platforms/83xx/Kconfig
565 source arch/powerpc/platforms/85xx/Kconfig
566 source arch/powerpc/platforms/86xx/Kconfig
567 source arch/powerpc/platforms/8xx/Kconfig
568 source arch/powerpc/platforms/cell/Kconfig
570 menu "Kernel options"
573 bool "High memory support"
576 source kernel/Kconfig.hz
577 source kernel/Kconfig.preempt
578 source "fs/Kconfig.binfmt"
580 # We optimistically allocate largepages from the VM, so make the limit
581 # large enough (16MB). This badly named config option is actually
583 config FORCE_MAX_ZONEORDER
586 default "9" if PPC_64K_PAGES
589 config MATH_EMULATION
590 bool "Math emulation"
591 depends on 4xx || 8xx || E200 || E500
593 Some PowerPC chips designed for embedded applications do not have
594 a floating-point unit and therefore do not implement the
595 floating-point instructions in the PowerPC instruction set. If you
596 say Y here, the kernel will include code to emulate a floating-point
597 unit, which will allow programs that use floating-point
601 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
602 depends on EXPERIMENTAL && PPC64
605 Cause IO segments sent to a device for DMA to be merged virtually
606 by the IOMMU when they happen to have been allocated contiguously.
607 This doesn't add pressure to the IOMMU allocator. However, some
608 drivers don't support getting large merged segments coming back
609 from *_map_sg(). Say Y if you know the drivers you are using are
610 properly handling this case.
613 bool "Support for enabling/disabling CPUs"
614 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
616 Say Y here to be able to disable and re-enable individual
617 CPUs at runtime on SMP machines.
619 Say N if you are unsure.
622 bool "kexec system call (EXPERIMENTAL)"
623 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
625 kexec is a system call that implements the ability to shutdown your
626 current kernel, and to start another kernel. It is like a reboot
627 but it is indepedent of the system firmware. And like a reboot
628 you can start any kernel with it, not just Linux.
630 The name comes from the similiarity to the exec system call.
632 It is an ongoing process to be certain the hardware in a machine
633 is properly shutdown, so do not be surprised if this code does not
634 initially work for you. It may help to enable device hotplugging
635 support. As of this writing the exact hardware interface is
636 strongly in flux, so no good recommendation can be made.
639 bool "Build a kdump crash kernel (EXPERIMENTAL)"
640 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
642 Build a kernel suitable for use as a kdump capture kernel.
643 The kernel will be linked at a different address than normal, and
644 so can only be used for Kdump.
646 Don't change this unless you know what you are doing.
650 depends on 8xx || 8260
654 bool "PC PS/2 style Keyboard"
655 depends on 4xx || CPM2
658 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
659 default y if PPC_PREP
662 bool "Distribute interrupts on all CPUs by default"
663 depends on SMP && !MV64360
665 This option gives the kernel permission to distribute IRQs across
666 multiple CPUs. Saying N here will route all IRQs to the first
667 CPU. Generally saying Y is safe, although some problems have been
668 reported with SMP Power Macintoshes with this option enabled.
670 source "arch/powerpc/platforms/pseries/Kconfig"
675 default y if SMP && PPC_PSERIES
680 depends on NEED_MULTIPLE_NODES
682 config ARCH_SELECT_MEMORY_MODEL
686 config ARCH_FLATMEM_ENABLE
688 depends on (PPC64 && !NUMA) || PPC32
690 config ARCH_SPARSEMEM_ENABLE
694 config ARCH_SPARSEMEM_DEFAULT
696 depends on SMP && PPC_PSERIES
700 config HAVE_ARCH_EARLY_PFN_TO_NID
702 depends on NEED_MULTIPLE_NODES
704 config ARCH_MEMORY_PROBE
706 depends on MEMORY_HOTPLUG
712 This option changes the kernel logical page size to 64k. On machines
713 without processor support for 64k pages, the kernel will simulate
714 them by loading each individual 4k page on demand transparently,
715 while on hardware with such support, it will be used to map
716 normal application pages.
719 bool "SMT (Hyperthreading) scheduler support"
720 depends on PPC64 && SMP
722 SMT scheduler support improves the CPU scheduler's decision making
723 when dealing with POWER5 cpus at a cost of slightly increased
724 overhead in some places. If unsure say N here.
726 config PROC_DEVICETREE
727 bool "Support for device tree in /proc"
730 This option adds a device-tree directory under /proc which contains
731 an image of the device tree that the kernel copies from Open
732 Firmware or other boot firmware. If unsure, say Y here.
734 source "arch/powerpc/platforms/prep/Kconfig"
737 bool "Default bootloader kernel arguments"
738 depends on !PPC_ISERIES
741 string "Initial kernel command string"
742 depends on CMDLINE_BOOL
743 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
745 On some platforms, there is currently no way for the boot loader to
746 pass arguments to the kernel. For these platforms, you can supply
747 some command-line options at build time by entering them here. In
748 most cases you will need to specify the root device here.
751 source kernel/power/Kconfig
755 bool "Enable seccomp to safely compute untrusted bytecode"
759 This kernel feature is useful for number crunching applications
760 that may need to compute untrusted bytecode during their
761 execution. By using pipes or other transports made available to
762 the process as file descriptors supporting the read/write
763 syscalls, it's possible to isolate those applications in
764 their own address space using seccomp. Once seccomp is
765 enabled via /proc/<pid>/seccomp, it cannot be disabled
766 and the task is only allowed to execute a few safe syscalls
767 defined by each seccomp mode.
769 If unsure, say Y. Only embedded should say N here.
780 bool "Support for ISA-bus hardware"
781 depends on PPC_PREP || PPC_CHRP
784 Find out whether you have ISA slots on your motherboard. ISA is the
785 name of a bus system, i.e. the way the CPU talks to the other stuff
786 inside your box. If you have an Apple machine, say N here; if you
787 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
788 you have an embedded board, consult your board documentation.
790 config GENERIC_ISA_DMA
792 depends on PPC64 || POWER4 || 6xx && !CPM2
799 config PPC_INDIRECT_PCI
802 default y if 40x || 44x
814 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
819 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
820 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
821 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
822 default PCI_QSPAN if !4xx && !CPM2 && 8xx
824 Find out whether your system includes a PCI bus. PCI is the name of
825 a bus system, i.e. the way the CPU talks to the other stuff inside
826 your box. If you say Y here, the kernel will include drivers and
827 infrastructure code to support PCI bus devices.
835 depends on !4xx && !CPM2 && 8xx
838 Say Y here if you have a system based on a Motorola 8xx-series
839 embedded processor with a QSPAN PCI interface, otherwise say N.
843 depends on PCI && 8260
844 select PPC_INDIRECT_PCI
848 bool "Enable workaround for MPC826x erratum PCI 9"
849 depends on PCI_8260 && !ADS8272
853 prompt "IDMA channel for PCI 9 workaround"
856 config 8260_PCI9_IDMA1
859 config 8260_PCI9_IDMA2
862 config 8260_PCI9_IDMA3
865 config 8260_PCI9_IDMA4
870 source "drivers/pci/pcie/Kconfig"
872 source "drivers/pci/Kconfig"
874 source "drivers/pcmcia/Kconfig"
876 source "drivers/pci/hotplug/Kconfig"
880 menu "Advanced setup"
883 config ADVANCED_OPTIONS
884 bool "Prompt for advanced kernel configuration options"
886 This option will enable prompting for a variety of advanced kernel
887 configuration options. These options can cause the kernel to not
888 work if they are set incorrectly, but can be used to optimize certain
889 aspects of kernel memory management.
891 Unless you know what you are doing, say N here.
893 comment "Default settings for advanced configuration options are used"
894 depends on !ADVANCED_OPTIONS
896 config HIGHMEM_START_BOOL
897 bool "Set high memory pool address"
898 depends on ADVANCED_OPTIONS && HIGHMEM
900 This option allows you to set the base address of the kernel virtual
901 area used to map high memory pages. This can be useful in
902 optimizing the layout of kernel virtual memory.
904 Say N here unless you know what you are doing.
907 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
910 config LOWMEM_SIZE_BOOL
911 bool "Set maximum low memory"
912 depends on ADVANCED_OPTIONS
914 This option allows you to set the maximum amount of memory which
915 will be used as "low memory", that is, memory which the kernel can
916 access directly, without having to set up a kernel virtual mapping.
917 This can be useful in optimizing the layout of kernel virtual
920 Say N here unless you know what you are doing.
923 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
926 config KERNEL_START_BOOL
927 bool "Set custom kernel base address"
928 depends on ADVANCED_OPTIONS
930 This option allows you to set the kernel virtual address at which
931 the kernel will map low memory (the kernel image will be linked at
932 this address). This can be useful in optimizing the virtual memory
933 layout of the system.
935 Say N here unless you know what you are doing.
938 hex "Virtual address of kernel base" if KERNEL_START_BOOL
941 config TASK_SIZE_BOOL
942 bool "Set custom user task size"
943 depends on ADVANCED_OPTIONS
945 This option allows you to set the amount of virtual address space
946 allocated to user tasks. This can be useful in optimizing the
947 virtual memory layout of the system.
949 Say N here unless you know what you are doing.
952 hex "Size of user task space" if TASK_SIZE_BOOL
955 config CONSISTENT_START_BOOL
956 bool "Set custom consistent memory pool address"
957 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
959 This option allows you to set the base virtual address
960 of the the consistent memory pool. This pool of virtual
961 memory is used to make consistent memory allocations.
963 config CONSISTENT_START
964 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
965 default "0xff100000" if NOT_COHERENT_CACHE
967 config CONSISTENT_SIZE_BOOL
968 bool "Set custom consistent memory pool size"
969 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
971 This option allows you to set the size of the the
972 consistent memory pool. This pool of virtual memory
973 is used to make consistent memory allocations.
975 config CONSISTENT_SIZE
976 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
977 default "0x00200000" if NOT_COHERENT_CACHE
979 config BOOT_LOAD_BOOL
980 bool "Set the boot link/load address"
981 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
983 This option allows you to set the initial load address of the zImage
984 or zImage.initrd file. This can be useful if you are on a board
985 which has a small amount of memory.
987 Say N here unless you know what you are doing.
990 hex "Link/load address for booting" if BOOT_LOAD_BOOL
991 default "0x00400000" if 40x || 8xx || 8260
992 default "0x01000000" if 44x
996 bool "Pinned Kernel TLBs (860 ONLY)"
997 depends on ADVANCED_OPTIONS && 8xx
1003 default "0xc000000000000000"
1006 source "net/Kconfig"
1008 source "drivers/Kconfig"
1012 # XXX source "arch/ppc/8xx_io/Kconfig"
1014 # XXX source "arch/ppc/8260_io/Kconfig"
1016 source "arch/powerpc/platforms/iseries/Kconfig"
1018 source "lib/Kconfig"
1020 menu "Instrumentation Support"
1021 depends on EXPERIMENTAL
1023 source "arch/powerpc/oprofile/Kconfig"
1026 bool "Kprobes (EXPERIMENTAL)"
1027 depends on PPC64 && EXPERIMENTAL && MODULES
1029 Kprobes allows you to trap at almost any kernel address and
1030 execute a callback function. register_kprobe() establishes
1031 a probepoint and specifies the callback. Kprobes is useful
1032 for kernel debugging, non-intrusive instrumentation and testing.
1033 If in doubt, say "N".
1036 source "arch/powerpc/Kconfig.debug"
1038 source "security/Kconfig"
1042 depends on COMPAT && KEYS
1045 source "crypto/Kconfig"