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||BROKEN_ON_SMP)
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
422 select UDBG_RTAS_CONSOLE
424 config UDBG_RTAS_CONSOLE
429 depends on PPC_PSERIES
435 depends on PPC_MULTIPLATFORM && PPC64
439 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP \
448 config RTAS_ERROR_LOGGING
454 bool "Proc interface to RTAS"
459 tristate "Firmware flash interface"
460 depends on PPC64 && RTAS_PROC
466 config MPIC_BROKEN_U3
472 depends on PPC_PSERIES || PPC_ISERIES
477 depends on PPC_PSERIES
478 bool "Support for GX bus based adapters"
480 Bus device driver for GX bus based adapters.
490 source "drivers/cpufreq/Kconfig"
493 bool "Support for Apple PowerBooks"
494 depends on CPU_FREQ && ADB_PMU && PPC32
495 select CPU_FREQ_TABLE
497 This adds support for frequency switching on Apple PowerBooks,
498 this currently includes some models of iBook & Titanium
501 config CPU_FREQ_PMAC64
502 bool "Support for some Apple G5s"
503 depends on CPU_FREQ && PMAC_SMU && PPC64
504 select CPU_FREQ_TABLE
506 This adds support for frequency switching on Apple iMac G5,
507 and some of the more recent desktop G5 machines as well.
509 config PPC601_SYNC_FIX
510 bool "Workarounds for PPC601 bugs"
511 depends on 6xx && (PPC_PREP || PPC_PMAC)
513 Some versions of the PPC601 (the first PowerPC chip) have bugs which
514 mean that extra synchronization instructions are required near
515 certain instructions, typically those that make major changes to the
516 CPU state. These extra instructions reduce performance slightly.
517 If you say N here, these extra instructions will not be included,
518 resulting in a kernel which will run faster but may not run at all
519 on some systems with the PPC601 chip.
521 If in doubt, say Y here.
524 bool "On-chip CPU temperature sensor support"
527 G3 and G4 processors have an on-chip temperature sensor called the
528 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
529 temperature within 2-4 degrees Celsius. This option shows the current
530 on-die temperature in /proc/cpuinfo if the cpu supports it.
532 Unfortunately, on some chip revisions, this sensor is very inaccurate
533 and in many cases, does not work at all, so don't assume the cpu
534 temp is actually what /proc/cpuinfo says it is.
537 bool "Interrupt driven TAU driver (DANGEROUS)"
540 The TAU supports an interrupt driven mode which causes an interrupt
541 whenever the temperature goes out of range. This is the fastest way
542 to get notified the temp has exceeded a range. With this option off,
543 a timer is used to re-check the temperature periodically.
545 However, on some cpus it appears that the TAU interrupt hardware
546 is buggy and can cause a situation which would lead unexplained hard
549 Unless you are extending the TAU driver, or enjoy kernel/hardware
550 debugging, leave this option off.
553 bool "Average high and low temp"
556 The TAU hardware can compare the temperature to an upper and lower
557 bound. The default behavior is to show both the upper and lower
558 bound in /proc/cpuinfo. If the range is large, the temperature is
559 either changing a lot, or the TAU hardware is broken (likely on some
560 G4's). If the range is small (around 4 degrees), the temperature is
561 relatively stable. If you say Y here, a single temperature value,
562 halfway between the upper and lower bounds, will be reported in
565 If in doubt, say N here.
568 source arch/powerpc/platforms/embedded6xx/Kconfig
569 source arch/powerpc/platforms/4xx/Kconfig
570 source arch/powerpc/platforms/83xx/Kconfig
571 source arch/powerpc/platforms/85xx/Kconfig
572 source arch/powerpc/platforms/86xx/Kconfig
573 source arch/powerpc/platforms/8xx/Kconfig
574 source arch/powerpc/platforms/cell/Kconfig
576 menu "Kernel options"
579 bool "High memory support"
582 source kernel/Kconfig.hz
583 source kernel/Kconfig.preempt
584 source "fs/Kconfig.binfmt"
586 # We optimistically allocate largepages from the VM, so make the limit
587 # large enough (16MB). This badly named config option is actually
589 config FORCE_MAX_ZONEORDER
592 default "9" if PPC_64K_PAGES
595 config MATH_EMULATION
596 bool "Math emulation"
597 depends on 4xx || 8xx || E200 || E500
599 Some PowerPC chips designed for embedded applications do not have
600 a floating-point unit and therefore do not implement the
601 floating-point instructions in the PowerPC instruction set. If you
602 say Y here, the kernel will include code to emulate a floating-point
603 unit, which will allow programs that use floating-point
607 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
608 depends on EXPERIMENTAL && PPC64
611 Cause IO segments sent to a device for DMA to be merged virtually
612 by the IOMMU when they happen to have been allocated contiguously.
613 This doesn't add pressure to the IOMMU allocator. However, some
614 drivers don't support getting large merged segments coming back
615 from *_map_sg(). Say Y if you know the drivers you are using are
616 properly handling this case.
619 bool "Support for enabling/disabling CPUs"
620 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
622 Say Y here to be able to disable and re-enable individual
623 CPUs at runtime on SMP machines.
625 Say N if you are unsure.
628 bool "kexec system call (EXPERIMENTAL)"
629 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
631 kexec is a system call that implements the ability to shutdown your
632 current kernel, and to start another kernel. It is like a reboot
633 but it is indepedent of the system firmware. And like a reboot
634 you can start any kernel with it, not just Linux.
636 The name comes from the similiarity to the exec system call.
638 It is an ongoing process to be certain the hardware in a machine
639 is properly shutdown, so do not be surprised if this code does not
640 initially work for you. It may help to enable device hotplugging
641 support. As of this writing the exact hardware interface is
642 strongly in flux, so no good recommendation can be made.
645 bool "Build a kdump crash kernel (EXPERIMENTAL)"
646 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
648 Build a kernel suitable for use as a kdump capture kernel.
649 The kernel will be linked at a different address than normal, and
650 so can only be used for Kdump.
652 Don't change this unless you know what you are doing.
656 depends on 8xx || 8260
660 bool "PC PS/2 style Keyboard"
661 depends on 4xx || CPM2
664 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
665 default y if PPC_PREP
668 bool "Distribute interrupts on all CPUs by default"
669 depends on SMP && !MV64360
671 This option gives the kernel permission to distribute IRQs across
672 multiple CPUs. Saying N here will route all IRQs to the first
673 CPU. Generally saying Y is safe, although some problems have been
674 reported with SMP Power Macintoshes with this option enabled.
676 source "arch/powerpc/platforms/pseries/Kconfig"
681 default y if SMP && PPC_PSERIES
686 depends on NEED_MULTIPLE_NODES
688 config ARCH_SELECT_MEMORY_MODEL
692 config ARCH_FLATMEM_ENABLE
694 depends on (PPC64 && !NUMA) || PPC32
696 config ARCH_SPARSEMEM_ENABLE
700 config ARCH_SPARSEMEM_DEFAULT
702 depends on SMP && PPC_PSERIES
706 config HAVE_ARCH_EARLY_PFN_TO_NID
708 depends on NEED_MULTIPLE_NODES
710 config ARCH_MEMORY_PROBE
712 depends on MEMORY_HOTPLUG
718 This option changes the kernel logical page size to 64k. On machines
719 without processor support for 64k pages, the kernel will simulate
720 them by loading each individual 4k page on demand transparently,
721 while on hardware with such support, it will be used to map
722 normal application pages.
725 bool "SMT (Hyperthreading) scheduler support"
726 depends on PPC64 && SMP
728 SMT scheduler support improves the CPU scheduler's decision making
729 when dealing with POWER5 cpus at a cost of slightly increased
730 overhead in some places. If unsure say N here.
732 config PROC_DEVICETREE
733 bool "Support for device tree in /proc"
736 This option adds a device-tree directory under /proc which contains
737 an image of the device tree that the kernel copies from Open
738 Firmware or other boot firmware. If unsure, say Y here.
740 source "arch/powerpc/platforms/prep/Kconfig"
743 bool "Default bootloader kernel arguments"
744 depends on !PPC_ISERIES
747 string "Initial kernel command string"
748 depends on CMDLINE_BOOL
749 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
751 On some platforms, there is currently no way for the boot loader to
752 pass arguments to the kernel. For these platforms, you can supply
753 some command-line options at build time by entering them here. In
754 most cases you will need to specify the root device here.
757 source kernel/power/Kconfig
761 bool "Enable seccomp to safely compute untrusted bytecode"
765 This kernel feature is useful for number crunching applications
766 that may need to compute untrusted bytecode during their
767 execution. By using pipes or other transports made available to
768 the process as file descriptors supporting the read/write
769 syscalls, it's possible to isolate those applications in
770 their own address space using seccomp. Once seccomp is
771 enabled via /proc/<pid>/seccomp, it cannot be disabled
772 and the task is only allowed to execute a few safe syscalls
773 defined by each seccomp mode.
775 If unsure, say Y. Only embedded should say N here.
786 bool "Support for ISA-bus hardware"
787 depends on PPC_PREP || PPC_CHRP
790 Find out whether you have ISA slots on your motherboard. ISA is the
791 name of a bus system, i.e. the way the CPU talks to the other stuff
792 inside your box. If you have an Apple machine, say N here; if you
793 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
794 you have an embedded board, consult your board documentation.
796 config GENERIC_ISA_DMA
798 depends on PPC64 || POWER4 || 6xx && !CPM2
805 config PPC_INDIRECT_PCI
808 default y if 40x || 44x
820 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
825 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES) \
827 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
828 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
829 default PCI_QSPAN if !4xx && !CPM2 && 8xx
831 Find out whether your system includes a PCI bus. PCI is the name of
832 a bus system, i.e. the way the CPU talks to the other stuff inside
833 your box. If you say Y here, the kernel will include drivers and
834 infrastructure code to support PCI bus devices.
842 depends on !4xx && !CPM2 && 8xx
845 Say Y here if you have a system based on a Motorola 8xx-series
846 embedded processor with a QSPAN PCI interface, otherwise say N.
850 depends on PCI && 8260
851 select PPC_INDIRECT_PCI
855 bool "Enable workaround for MPC826x erratum PCI 9"
856 depends on PCI_8260 && !ADS8272
860 prompt "IDMA channel for PCI 9 workaround"
863 config 8260_PCI9_IDMA1
866 config 8260_PCI9_IDMA2
869 config 8260_PCI9_IDMA3
872 config 8260_PCI9_IDMA4
877 source "drivers/pci/pcie/Kconfig"
879 source "drivers/pci/Kconfig"
881 source "drivers/pcmcia/Kconfig"
883 source "drivers/pci/hotplug/Kconfig"
887 menu "Advanced setup"
890 config ADVANCED_OPTIONS
891 bool "Prompt for advanced kernel configuration options"
893 This option will enable prompting for a variety of advanced kernel
894 configuration options. These options can cause the kernel to not
895 work if they are set incorrectly, but can be used to optimize certain
896 aspects of kernel memory management.
898 Unless you know what you are doing, say N here.
900 comment "Default settings for advanced configuration options are used"
901 depends on !ADVANCED_OPTIONS
903 config HIGHMEM_START_BOOL
904 bool "Set high memory pool address"
905 depends on ADVANCED_OPTIONS && HIGHMEM
907 This option allows you to set the base address of the kernel virtual
908 area used to map high memory pages. This can be useful in
909 optimizing the layout of kernel virtual memory.
911 Say N here unless you know what you are doing.
914 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
917 config LOWMEM_SIZE_BOOL
918 bool "Set maximum low memory"
919 depends on ADVANCED_OPTIONS
921 This option allows you to set the maximum amount of memory which
922 will be used as "low memory", that is, memory which the kernel can
923 access directly, without having to set up a kernel virtual mapping.
924 This can be useful in optimizing the layout of kernel virtual
927 Say N here unless you know what you are doing.
930 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
933 config KERNEL_START_BOOL
934 bool "Set custom kernel base address"
935 depends on ADVANCED_OPTIONS
937 This option allows you to set the kernel virtual address at which
938 the kernel will map low memory (the kernel image will be linked at
939 this address). This can be useful in optimizing the virtual memory
940 layout of the system.
942 Say N here unless you know what you are doing.
945 hex "Virtual address of kernel base" if KERNEL_START_BOOL
948 config TASK_SIZE_BOOL
949 bool "Set custom user task size"
950 depends on ADVANCED_OPTIONS
952 This option allows you to set the amount of virtual address space
953 allocated to user tasks. This can be useful in optimizing the
954 virtual memory layout of the system.
956 Say N here unless you know what you are doing.
959 hex "Size of user task space" if TASK_SIZE_BOOL
962 config CONSISTENT_START_BOOL
963 bool "Set custom consistent memory pool address"
964 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
966 This option allows you to set the base virtual address
967 of the the consistent memory pool. This pool of virtual
968 memory is used to make consistent memory allocations.
970 config CONSISTENT_START
971 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
972 default "0xff100000" if NOT_COHERENT_CACHE
974 config CONSISTENT_SIZE_BOOL
975 bool "Set custom consistent memory pool size"
976 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
978 This option allows you to set the size of the the
979 consistent memory pool. This pool of virtual memory
980 is used to make consistent memory allocations.
982 config CONSISTENT_SIZE
983 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
984 default "0x00200000" if NOT_COHERENT_CACHE
986 config BOOT_LOAD_BOOL
987 bool "Set the boot link/load address"
988 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
990 This option allows you to set the initial load address of the zImage
991 or zImage.initrd file. This can be useful if you are on a board
992 which has a small amount of memory.
994 Say N here unless you know what you are doing.
997 hex "Link/load address for booting" if BOOT_LOAD_BOOL
998 default "0x00400000" if 40x || 8xx || 8260
999 default "0x01000000" if 44x
1000 default "0x00800000"
1003 bool "Pinned Kernel TLBs (860 ONLY)"
1004 depends on ADVANCED_OPTIONS && 8xx
1010 default "0xc000000000000000"
1013 source "net/Kconfig"
1015 source "drivers/Kconfig"
1019 # XXX source "arch/ppc/8xx_io/Kconfig"
1021 # XXX source "arch/ppc/8260_io/Kconfig"
1023 source "arch/powerpc/platforms/iseries/Kconfig"
1025 source "lib/Kconfig"
1027 menu "Instrumentation Support"
1028 depends on EXPERIMENTAL
1030 source "arch/powerpc/oprofile/Kconfig"
1033 bool "Kprobes (EXPERIMENTAL)"
1034 depends on PPC64 && EXPERIMENTAL && MODULES
1036 Kprobes allows you to trap at almost any kernel address and
1037 execute a callback function. register_kprobe() establishes
1038 a probepoint and specifies the callback. Kprobes is useful
1039 for kernel debugging, non-intrusive instrumentation and testing.
1040 If in doubt, say "N".
1043 source "arch/powerpc/Kconfig.debug"
1045 source "security/Kconfig"
1049 depends on COMPAT && KEYS
1052 source "crypto/Kconfig"