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
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
428 depends on PPC_PSERIES
434 depends on PPC_MULTIPLATFORM && PPC64
438 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
446 config RTAS_ERROR_LOGGING
452 bool "Proc interface to RTAS"
457 tristate "Firmware flash interface"
458 depends on PPC64 && RTAS_PROC
464 config MPIC_BROKEN_U3
470 depends on PPC_PSERIES || PPC_ISERIES
475 depends on PPC_PSERIES
476 bool "Support for GX bus based adapters"
478 Bus device driver for GX bus based adapters.
488 source "drivers/cpufreq/Kconfig"
491 bool "Support for Apple PowerBooks"
492 depends on CPU_FREQ && ADB_PMU && PPC32
493 select CPU_FREQ_TABLE
495 This adds support for frequency switching on Apple PowerBooks,
496 this currently includes some models of iBook & Titanium
499 config CPU_FREQ_PMAC64
500 bool "Support for some Apple G5s"
501 depends on CPU_FREQ && PMAC_SMU && PPC64
502 select CPU_FREQ_TABLE
504 This adds support for frequency switching on Apple iMac G5,
505 and some of the more recent desktop G5 machines as well.
507 config PPC601_SYNC_FIX
508 bool "Workarounds for PPC601 bugs"
509 depends on 6xx && (PPC_PREP || PPC_PMAC)
511 Some versions of the PPC601 (the first PowerPC chip) have bugs which
512 mean that extra synchronization instructions are required near
513 certain instructions, typically those that make major changes to the
514 CPU state. These extra instructions reduce performance slightly.
515 If you say N here, these extra instructions will not be included,
516 resulting in a kernel which will run faster but may not run at all
517 on some systems with the PPC601 chip.
519 If in doubt, say Y here.
522 bool "On-chip CPU temperature sensor support"
525 G3 and G4 processors have an on-chip temperature sensor called the
526 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
527 temperature within 2-4 degrees Celsius. This option shows the current
528 on-die temperature in /proc/cpuinfo if the cpu supports it.
530 Unfortunately, on some chip revisions, this sensor is very inaccurate
531 and in many cases, does not work at all, so don't assume the cpu
532 temp is actually what /proc/cpuinfo says it is.
535 bool "Interrupt driven TAU driver (DANGEROUS)"
538 The TAU supports an interrupt driven mode which causes an interrupt
539 whenever the temperature goes out of range. This is the fastest way
540 to get notified the temp has exceeded a range. With this option off,
541 a timer is used to re-check the temperature periodically.
543 However, on some cpus it appears that the TAU interrupt hardware
544 is buggy and can cause a situation which would lead unexplained hard
547 Unless you are extending the TAU driver, or enjoy kernel/hardware
548 debugging, leave this option off.
551 bool "Average high and low temp"
554 The TAU hardware can compare the temperature to an upper and lower
555 bound. The default behavior is to show both the upper and lower
556 bound in /proc/cpuinfo. If the range is large, the temperature is
557 either changing a lot, or the TAU hardware is broken (likely on some
558 G4's). If the range is small (around 4 degrees), the temperature is
559 relatively stable. If you say Y here, a single temperature value,
560 halfway between the upper and lower bounds, will be reported in
563 If in doubt, say N here.
566 source arch/powerpc/platforms/embedded6xx/Kconfig
567 source arch/powerpc/platforms/4xx/Kconfig
568 source arch/powerpc/platforms/83xx/Kconfig
569 source arch/powerpc/platforms/85xx/Kconfig
570 source arch/powerpc/platforms/86xx/Kconfig
571 source arch/powerpc/platforms/8xx/Kconfig
572 source arch/powerpc/platforms/cell/Kconfig
574 menu "Kernel options"
577 bool "High memory support"
580 source kernel/Kconfig.hz
581 source kernel/Kconfig.preempt
582 source "fs/Kconfig.binfmt"
584 # We optimistically allocate largepages from the VM, so make the limit
585 # large enough (16MB). This badly named config option is actually
587 config FORCE_MAX_ZONEORDER
590 default "9" if PPC_64K_PAGES
593 config MATH_EMULATION
594 bool "Math emulation"
595 depends on 4xx || 8xx || E200 || E500
597 Some PowerPC chips designed for embedded applications do not have
598 a floating-point unit and therefore do not implement the
599 floating-point instructions in the PowerPC instruction set. If you
600 say Y here, the kernel will include code to emulate a floating-point
601 unit, which will allow programs that use floating-point
605 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
606 depends on EXPERIMENTAL && PPC64
609 Cause IO segments sent to a device for DMA to be merged virtually
610 by the IOMMU when they happen to have been allocated contiguously.
611 This doesn't add pressure to the IOMMU allocator. However, some
612 drivers don't support getting large merged segments coming back
613 from *_map_sg(). Say Y if you know the drivers you are using are
614 properly handling this case.
617 bool "Support for enabling/disabling CPUs"
618 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
620 Say Y here to be able to disable and re-enable individual
621 CPUs at runtime on SMP machines.
623 Say N if you are unsure.
625 config ARCH_ENABLE_MEMORY_HOTPLUG
629 bool "kexec system call (EXPERIMENTAL)"
630 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
632 kexec is a system call that implements the ability to shutdown your
633 current kernel, and to start another kernel. It is like a reboot
634 but it is indepedent of the system firmware. And like a reboot
635 you can start any kernel with it, not just Linux.
637 The name comes from the similiarity to the exec system call.
639 It is an ongoing process to be certain the hardware in a machine
640 is properly shutdown, so do not be surprised if this code does not
641 initially work for you. It may help to enable device hotplugging
642 support. As of this writing the exact hardware interface is
643 strongly in flux, so no good recommendation can be made.
646 bool "Build a kdump crash kernel (EXPERIMENTAL)"
647 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
649 Build a kernel suitable for use as a kdump capture kernel.
650 The kernel will be linked at a different address than normal, and
651 so can only be used for Kdump.
653 Don't change this unless you know what you are doing.
657 depends on 8xx || 8260
661 bool "PC PS/2 style Keyboard"
662 depends on 4xx || CPM2
665 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
666 default y if PPC_PREP
669 bool "Distribute interrupts on all CPUs by default"
670 depends on SMP && !MV64360
672 This option gives the kernel permission to distribute IRQs across
673 multiple CPUs. Saying N here will route all IRQs to the first
674 CPU. Generally saying Y is safe, although some problems have been
675 reported with SMP Power Macintoshes with this option enabled.
677 source "arch/powerpc/platforms/pseries/Kconfig"
682 default y if SMP && PPC_PSERIES
687 depends on NEED_MULTIPLE_NODES
689 config ARCH_SELECT_MEMORY_MODEL
693 config ARCH_FLATMEM_ENABLE
695 depends on (PPC64 && !NUMA) || PPC32
697 config ARCH_SPARSEMEM_ENABLE
701 config ARCH_SPARSEMEM_DEFAULT
703 depends on SMP && PPC_PSERIES
707 config HAVE_ARCH_EARLY_PFN_TO_NID
709 depends on NEED_MULTIPLE_NODES
711 config ARCH_MEMORY_PROBE
713 depends on MEMORY_HOTPLUG
719 This option changes the kernel logical page size to 64k. On machines
720 without processor support for 64k pages, the kernel will simulate
721 them by loading each individual 4k page on demand transparently,
722 while on hardware with such support, it will be used to map
723 normal application pages.
726 bool "SMT (Hyperthreading) scheduler support"
727 depends on PPC64 && SMP
729 SMT scheduler support improves the CPU scheduler's decision making
730 when dealing with POWER5 cpus at a cost of slightly increased
731 overhead in some places. If unsure say N here.
733 config PROC_DEVICETREE
734 bool "Support for device tree in /proc"
737 This option adds a device-tree directory under /proc which contains
738 an image of the device tree that the kernel copies from Open
739 Firmware or other boot firmware. If unsure, say Y here.
741 source "arch/powerpc/platforms/prep/Kconfig"
744 bool "Default bootloader kernel arguments"
745 depends on !PPC_ISERIES
748 string "Initial kernel command string"
749 depends on CMDLINE_BOOL
750 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
752 On some platforms, there is currently no way for the boot loader to
753 pass arguments to the kernel. For these platforms, you can supply
754 some command-line options at build time by entering them here. In
755 most cases you will need to specify the root device here.
758 source kernel/power/Kconfig
762 bool "Enable seccomp to safely compute untrusted bytecode"
766 This kernel feature is useful for number crunching applications
767 that may need to compute untrusted bytecode during their
768 execution. By using pipes or other transports made available to
769 the process as file descriptors supporting the read/write
770 syscalls, it's possible to isolate those applications in
771 their own address space using seccomp. Once seccomp is
772 enabled via /proc/<pid>/seccomp, it cannot be disabled
773 and the task is only allowed to execute a few safe syscalls
774 defined by each seccomp mode.
776 If unsure, say Y. Only embedded should say N here.
787 bool "Support for ISA-bus hardware"
788 depends on PPC_PREP || PPC_CHRP
791 Find out whether you have ISA slots on your motherboard. ISA is the
792 name of a bus system, i.e. the way the CPU talks to the other stuff
793 inside your box. If you have an Apple machine, say N here; if you
794 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
795 you have an embedded board, consult your board documentation.
797 config GENERIC_ISA_DMA
799 depends on PPC64 || POWER4 || 6xx && !CPM2
804 default y if MPC8641_HPCN
807 config PPC_INDIRECT_PCI
810 default y if 40x || 44x
822 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
827 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
828 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx && !PPC_86xx
829 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
830 default PCI_QSPAN if !4xx && !CPM2 && 8xx
832 Find out whether your system includes a PCI bus. PCI is the name of
833 a bus system, i.e. the way the CPU talks to the other stuff inside
834 your box. If you say Y here, the kernel will include drivers and
835 infrastructure code to support PCI bus devices.
843 depends on !4xx && !CPM2 && 8xx
846 Say Y here if you have a system based on a Motorola 8xx-series
847 embedded processor with a QSPAN PCI interface, otherwise say N.
851 depends on PCI && 8260
852 select PPC_INDIRECT_PCI
856 bool "Enable workaround for MPC826x erratum PCI 9"
857 depends on PCI_8260 && !ADS8272
861 prompt "IDMA channel for PCI 9 workaround"
864 config 8260_PCI9_IDMA1
867 config 8260_PCI9_IDMA2
870 config 8260_PCI9_IDMA3
873 config 8260_PCI9_IDMA4
878 source "drivers/pci/pcie/Kconfig"
880 source "drivers/pci/Kconfig"
882 source "drivers/pcmcia/Kconfig"
884 source "drivers/pci/hotplug/Kconfig"
888 menu "Advanced setup"
891 config ADVANCED_OPTIONS
892 bool "Prompt for advanced kernel configuration options"
894 This option will enable prompting for a variety of advanced kernel
895 configuration options. These options can cause the kernel to not
896 work if they are set incorrectly, but can be used to optimize certain
897 aspects of kernel memory management.
899 Unless you know what you are doing, say N here.
901 comment "Default settings for advanced configuration options are used"
902 depends on !ADVANCED_OPTIONS
904 config HIGHMEM_START_BOOL
905 bool "Set high memory pool address"
906 depends on ADVANCED_OPTIONS && HIGHMEM
908 This option allows you to set the base address of the kernel virtual
909 area used to map high memory pages. This can be useful in
910 optimizing the layout of kernel virtual memory.
912 Say N here unless you know what you are doing.
915 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
918 config LOWMEM_SIZE_BOOL
919 bool "Set maximum low memory"
920 depends on ADVANCED_OPTIONS
922 This option allows you to set the maximum amount of memory which
923 will be used as "low memory", that is, memory which the kernel can
924 access directly, without having to set up a kernel virtual mapping.
925 This can be useful in optimizing the layout of kernel virtual
928 Say N here unless you know what you are doing.
931 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
934 config KERNEL_START_BOOL
935 bool "Set custom kernel base address"
936 depends on ADVANCED_OPTIONS
938 This option allows you to set the kernel virtual address at which
939 the kernel will map low memory (the kernel image will be linked at
940 this address). This can be useful in optimizing the virtual memory
941 layout of the system.
943 Say N here unless you know what you are doing.
946 hex "Virtual address of kernel base" if KERNEL_START_BOOL
949 config TASK_SIZE_BOOL
950 bool "Set custom user task size"
951 depends on ADVANCED_OPTIONS
953 This option allows you to set the amount of virtual address space
954 allocated to user tasks. This can be useful in optimizing the
955 virtual memory layout of the system.
957 Say N here unless you know what you are doing.
960 hex "Size of user task space" if TASK_SIZE_BOOL
963 config CONSISTENT_START_BOOL
964 bool "Set custom consistent memory pool address"
965 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
967 This option allows you to set the base virtual address
968 of the the consistent memory pool. This pool of virtual
969 memory is used to make consistent memory allocations.
971 config CONSISTENT_START
972 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
973 default "0xff100000" if NOT_COHERENT_CACHE
975 config CONSISTENT_SIZE_BOOL
976 bool "Set custom consistent memory pool size"
977 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
979 This option allows you to set the size of the the
980 consistent memory pool. This pool of virtual memory
981 is used to make consistent memory allocations.
983 config CONSISTENT_SIZE
984 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
985 default "0x00200000" if NOT_COHERENT_CACHE
987 config BOOT_LOAD_BOOL
988 bool "Set the boot link/load address"
989 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
991 This option allows you to set the initial load address of the zImage
992 or zImage.initrd file. This can be useful if you are on a board
993 which has a small amount of memory.
995 Say N here unless you know what you are doing.
998 hex "Link/load address for booting" if BOOT_LOAD_BOOL
999 default "0x00400000" if 40x || 8xx || 8260
1000 default "0x01000000" if 44x
1001 default "0x00800000"
1004 bool "Pinned Kernel TLBs (860 ONLY)"
1005 depends on ADVANCED_OPTIONS && 8xx
1011 default "0xc000000000000000"
1014 source "net/Kconfig"
1016 source "drivers/Kconfig"
1020 # XXX source "arch/ppc/8xx_io/Kconfig"
1022 # XXX source "arch/ppc/8260_io/Kconfig"
1024 source "arch/powerpc/platforms/iseries/Kconfig"
1026 source "lib/Kconfig"
1028 menu "Instrumentation Support"
1029 depends on EXPERIMENTAL
1031 source "arch/powerpc/oprofile/Kconfig"
1034 bool "Kprobes (EXPERIMENTAL)"
1035 depends on PPC64 && EXPERIMENTAL && MODULES
1037 Kprobes allows you to trap at almost any kernel address and
1038 execute a callback function. register_kprobe() establishes
1039 a probepoint and specifies the callback. Kprobes is useful
1040 for kernel debugging, non-intrusive instrumentation and testing.
1041 If in doubt, say "N".
1044 source "arch/powerpc/Kconfig.debug"
1046 source "security/Kconfig"
1050 depends on COMPAT && KEYS
1053 source "crypto/Kconfig"