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
32 config GENERIC_HARDIRQS
36 config RWSEM_GENERIC_SPINLOCK
39 config RWSEM_XCHGADD_ALGORITHM
43 config GENERIC_CALIBRATE_DELAY
61 depends on COMPAT && SYSVIPC
64 # All PPC32s use generic nvram driver through ppc_md
69 config SCHED_NO_NO_OMIT_FRAME_POINTER
73 config ARCH_MAY_HAVE_PC_FDC
77 menu "Processor support"
79 prompt "Processor Type"
87 There are four families of PowerPC chips supported. The more common
88 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
89 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
90 embedded versions (403 and 405) and the high end 64 bit Power
91 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
93 Unless you are building a kernel for one of the embedded processor
94 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
95 Note that the kernel runs in 32-bit mode even on 64-bit chips.
101 bool "Freescale 82xx"
104 bool "Freescale 83xx"
116 bool "Freescale e200"
119 bool "Freescale e500"
123 bool "Optimize for POWER4"
127 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
128 The resulting binary will not work on POWER3 or RS64 processors
129 when compiled with binutils 2.15 or later.
134 default y if !POWER4_ONLY
146 depends on E200 || E500
151 depends on E200 || E500
156 depends on 44x || E500
158 default y if E500 && PHYS_64BIT
161 bool 'Large physical address support' if E500
162 depends on 44x || E500
165 This option enables kernel support for larger than 32-bit physical
166 addresses. This features is not be available on all e500 cores.
168 If in doubt, say N here.
171 bool "AltiVec Support"
172 depends on 6xx || POWER4
174 This option enables kernel support for the Altivec extensions to the
175 PowerPC processor. The kernel currently supports saving and restoring
176 altivec registers, and turning on the 'altivec enable' bit so user
177 processes can execute altivec instructions.
179 This option is only usefully if you have a processor that supports
180 altivec (G4, otherwise known as 74xx series), but does not have
181 any affect on a non-altivec cpu (it does, however add code to the
184 If in doubt, say Y here.
188 depends on E200 || E500
190 This option enables kernel support for the Signal Processing
191 Extensions (SPE) to the PowerPC processor. The kernel currently
192 supports saving and restoring SPE registers, and turning on the
193 'spe enable' bit so user processes can execute SPE instructions.
195 This option is only useful if you have a processor that supports
196 SPE (e500, otherwise known as 85xx series), but does not have any
197 effect on a non-spe cpu (it does, however add code to the kernel).
199 If in doubt, say Y here.
203 depends on 6xx || POWER3 || POWER4 || PPC64
206 config PPC_STD_MMU_32
208 depends on PPC_STD_MMU && PPC32
211 depends on PPC_STD_MMU
212 bool "Symmetric multi-processing support"
214 This enables support for systems with more than one CPU. If you have
215 a system with only one CPU, say N. If you have a system with more
216 than one CPU, say Y. Note that the kernel does not currently
217 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
218 since they have inadequate hardware support for multiprocessor
221 If you say N here, the kernel will run on single and multiprocessor
222 machines, but will use only one CPU of a multiprocessor machine. If
223 you say Y here, the kernel will run on single-processor machines.
224 On a single-processor machine, the kernel will run faster if you say
227 If you don't know what to do here, say N.
230 int "Maximum number of CPUs (2-128)"
233 default "32" if PPC64
236 config NOT_COHERENT_CACHE
238 depends on 4xx || 8xx || E200
242 source "init/Kconfig"
244 menu "Platform support"
245 depends on PPC64 || 6xx
248 prompt "Machine type"
249 default PPC_MULTIPLATFORM
251 config PPC_MULTIPLATFORM
252 bool "Generic desktop/server/laptop"
254 Select this option if configuring for an IBM pSeries or
255 RS/6000 machine, an Apple machine, or a PReP, CHRP,
256 Maple or Cell-based machine.
259 bool "IBM Legacy iSeries"
263 bool "Embedded 6xx/7xx/7xxx-based board"
264 depends on PPC32 && BROKEN
268 depends on PPC32 && BROKEN
270 Select APUS if configuring for a PowerUP Amiga.
271 More information is available at:
272 <http://linux-apus.sourceforge.net/>.
276 depends on PPC_MULTIPLATFORM && PPC64
277 bool " IBM pSeries & new (POWER5-based) iSeries"
280 select RTAS_ERROR_LOGGING
284 bool " Common Hardware Reference Platform (CHRP) based machines"
285 depends on PPC_MULTIPLATFORM && PPC32
287 select PPC_INDIRECT_PCI
293 bool " Apple PowerMac based machines"
294 depends on PPC_MULTIPLATFORM
295 select PPC_INDIRECT_PCI if PPC32
296 select PPC_MPC106 if PPC32
301 depends on PPC_PMAC && POWER4
303 select MPIC_BROKEN_U3
304 select GENERIC_TBSYNC
308 bool " PowerPC Reference Platform (PReP) based machines"
309 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
311 select PPC_INDIRECT_PCI
315 depends on PPC_MULTIPLATFORM && PPC64
316 bool " Maple 970FX Evaluation Board"
318 select MPIC_BROKEN_U3
319 select GENERIC_TBSYNC
322 This option enables support for the Maple 970FX Evaluation Board.
323 For more informations, refer to <http://www.970eval.com>
326 bool " Cell Broadband Processor Architecture"
327 depends on PPC_MULTIPLATFORM && PPC64
335 depends on PPC_PSERIES
341 depends on PPC_MULTIPLATFORM && PPC64
345 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
353 config RTAS_ERROR_LOGGING
359 bool "Proc interface to RTAS"
364 tristate "Firmware flash interface"
365 depends on PPC64 && RTAS_PROC
371 config MPIC_BROKEN_U3
382 bool "kernel crash dumps (EXPERIMENTAL)"
383 depends on PPC_MULTIPLATFORM
384 depends on EXPERIMENTAL
386 Build a kernel suitable for use as a kdump capture kernel.
387 The kernel will be linked at a different address than normal, and
388 so can only be used for Kdump.
390 Don't change this unless you know what you are doing.
393 depends on PPC_PSERIES || PPC_ISERIES
398 depends on PPC_PSERIES
399 bool "Support for GX bus based adapters"
401 Bus device driver for GX bus based adapters.
407 config GENERIC_TBSYNC
409 default y if CONFIG_PPC32 && CONFIG_SMP
412 source "drivers/cpufreq/Kconfig"
415 bool "Support for Apple PowerBooks"
416 depends on CPU_FREQ && ADB_PMU && PPC32
417 select CPU_FREQ_TABLE
419 This adds support for frequency switching on Apple PowerBooks,
420 this currently includes some models of iBook & Titanium
423 config CPU_FREQ_PMAC64
424 bool "Support for some Apple G5s"
425 depends on CPU_FREQ && PMAC_SMU && PPC64
426 select CPU_FREQ_TABLE
428 This adds support for frequency switching on Apple iMac G5,
429 and some of the more recent desktop G5 machines as well.
431 config PPC601_SYNC_FIX
432 bool "Workarounds for PPC601 bugs"
433 depends on 6xx && (PPC_PREP || PPC_PMAC)
435 Some versions of the PPC601 (the first PowerPC chip) have bugs which
436 mean that extra synchronization instructions are required near
437 certain instructions, typically those that make major changes to the
438 CPU state. These extra instructions reduce performance slightly.
439 If you say N here, these extra instructions will not be included,
440 resulting in a kernel which will run faster but may not run at all
441 on some systems with the PPC601 chip.
443 If in doubt, say Y here.
446 bool "Thermal Management Support"
449 G3 and G4 processors have an on-chip temperature sensor called the
450 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
451 temperature within 2-4 degrees Celsius. This option shows the current
452 on-die temperature in /proc/cpuinfo if the cpu supports it.
454 Unfortunately, on some chip revisions, this sensor is very inaccurate
455 and in some cases, does not work at all, so don't assume the cpu
456 temp is actually what /proc/cpuinfo says it is.
459 bool "Interrupt driven TAU driver (DANGEROUS)"
462 The TAU supports an interrupt driven mode which causes an interrupt
463 whenever the temperature goes out of range. This is the fastest way
464 to get notified the temp has exceeded a range. With this option off,
465 a timer is used to re-check the temperature periodically.
467 However, on some cpus it appears that the TAU interrupt hardware
468 is buggy and can cause a situation which would lead unexplained hard
471 Unless you are extending the TAU driver, or enjoy kernel/hardware
472 debugging, leave this option off.
475 bool "Average high and low temp"
478 The TAU hardware can compare the temperature to an upper and lower
479 bound. The default behavior is to show both the upper and lower
480 bound in /proc/cpuinfo. If the range is large, the temperature is
481 either changing a lot, or the TAU hardware is broken (likely on some
482 G4's). If the range is small (around 4 degrees), the temperature is
483 relatively stable. If you say Y here, a single temperature value,
484 halfway between the upper and lower bounds, will be reported in
487 If in doubt, say N here.
490 source arch/powerpc/platforms/embedded6xx/Kconfig
491 source arch/powerpc/platforms/4xx/Kconfig
492 source arch/powerpc/platforms/85xx/Kconfig
493 source arch/powerpc/platforms/8xx/Kconfig
494 source arch/powerpc/platforms/cell/Kconfig
496 menu "Kernel options"
499 bool "High memory support"
502 source kernel/Kconfig.hz
503 source kernel/Kconfig.preempt
504 source "fs/Kconfig.binfmt"
506 # We optimistically allocate largepages from the VM, so make the limit
507 # large enough (16MB). This badly named config option is actually
509 config FORCE_MAX_ZONEORDER
512 default "9" if PPC_64K_PAGES
515 config MATH_EMULATION
516 bool "Math emulation"
517 depends on 4xx || 8xx || E200 || E500
519 Some PowerPC chips designed for embedded applications do not have
520 a floating-point unit and therefore do not implement the
521 floating-point instructions in the PowerPC instruction set. If you
522 say Y here, the kernel will include code to emulate a floating-point
523 unit, which will allow programs that use floating-point
527 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
528 depends on EXPERIMENTAL && PPC64
531 Cause IO segments sent to a device for DMA to be merged virtually
532 by the IOMMU when they happen to have been allocated contiguously.
533 This doesn't add pressure to the IOMMU allocator. However, some
534 drivers don't support getting large merged segments coming back
535 from *_map_sg(). Say Y if you know the drivers you are using are
536 properly handling this case.
539 bool "Support for enabling/disabling CPUs"
540 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
542 Say Y here to be able to disable and re-enable individual
543 CPUs at runtime on SMP machines.
545 Say N if you are unsure.
548 bool "kexec system call (EXPERIMENTAL)"
549 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
551 kexec is a system call that implements the ability to shutdown your
552 current kernel, and to start another kernel. It is like a reboot
553 but it is indepedent of the system firmware. And like a reboot
554 you can start any kernel with it, not just Linux.
556 The name comes from the similiarity to the exec system call.
558 It is an ongoing process to be certain the hardware in a machine
559 is properly shutdown, so do not be surprised if this code does not
560 initially work for you. It may help to enable device hotplugging
561 support. As of this writing the exact hardware interface is
562 strongly in flux, so no good recommendation can be made.
566 depends on 8xx || 8260
570 bool "PC PS/2 style Keyboard"
571 depends on 4xx || CPM2
574 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
575 default y if PPC_PREP
578 bool "Distribute interrupts on all CPUs by default"
579 depends on SMP && !MV64360
581 This option gives the kernel permission to distribute IRQs across
582 multiple CPUs. Saying N here will route all IRQs to the first
583 CPU. Generally saying Y is safe, although some problems have been
584 reported with SMP Power Macintoshes with this option enabled.
586 source "arch/powerpc/platforms/pseries/Kconfig"
591 default y if SMP && PPC_PSERIES
593 config ARCH_SELECT_MEMORY_MODEL
597 config ARCH_FLATMEM_ENABLE
599 depends on (PPC64 && !NUMA) || PPC32
601 config ARCH_SPARSEMEM_ENABLE
605 config ARCH_SPARSEMEM_DEFAULT
607 depends on SMP && PPC_PSERIES
611 config HAVE_ARCH_EARLY_PFN_TO_NID
613 depends on NEED_MULTIPLE_NODES
615 config ARCH_MEMORY_PROBE
617 depends on MEMORY_HOTPLUG
623 This option changes the kernel logical page size to 64k. On machines
624 without processor support for 64k pages, the kernel will simulate
625 them by loading each individual 4k page on demand transparently,
626 while on hardware with such support, it will be used to map
627 normal application pages.
630 bool "SMT (Hyperthreading) scheduler support"
631 depends on PPC64 && SMP
634 SMT scheduler support improves the CPU scheduler's decision making
635 when dealing with POWER5 cpus at a cost of slightly increased
636 overhead in some places. If unsure say N here.
638 config PROC_DEVICETREE
639 bool "Support for device tree in /proc"
642 This option adds a device-tree directory under /proc which contains
643 an image of the device tree that the kernel copies from Open
644 Firmware or other boot firmware. If unsure, say Y here.
646 source "arch/powerpc/platforms/prep/Kconfig"
649 bool "Default bootloader kernel arguments"
650 depends on !PPC_ISERIES
653 string "Initial kernel command string"
654 depends on CMDLINE_BOOL
655 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
657 On some platforms, there is currently no way for the boot loader to
658 pass arguments to the kernel. For these platforms, you can supply
659 some command-line options at build time by entering them here. In
660 most cases you will need to specify the root device here.
663 source kernel/power/Kconfig
667 bool "Enable seccomp to safely compute untrusted bytecode"
671 This kernel feature is useful for number crunching applications
672 that may need to compute untrusted bytecode during their
673 execution. By using pipes or other transports made available to
674 the process as file descriptors supporting the read/write
675 syscalls, it's possible to isolate those applications in
676 their own address space using seccomp. Once seccomp is
677 enabled via /proc/<pid>/seccomp, it cannot be disabled
678 and the task is only allowed to execute a few safe syscalls
679 defined by each seccomp mode.
681 If unsure, say Y. Only embedded should say N here.
692 bool "Support for ISA-bus hardware"
693 depends on PPC_PREP || PPC_CHRP
696 Find out whether you have ISA slots on your motherboard. ISA is the
697 name of a bus system, i.e. the way the CPU talks to the other stuff
698 inside your box. If you have an Apple machine, say N here; if you
699 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
700 you have an embedded board, consult your board documentation.
702 config GENERIC_ISA_DMA
704 depends on PPC64 || POWER4 || 6xx && !CPM2
712 config PPC_INDIRECT_PCI
715 default y if 40x || 44x || 85xx || 83xx
724 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
729 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
730 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
731 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
732 default PCI_QSPAN if !4xx && !CPM2 && 8xx
734 Find out whether your system includes a PCI bus. PCI is the name of
735 a bus system, i.e. the way the CPU talks to the other stuff inside
736 your box. If you say Y here, the kernel will include drivers and
737 infrastructure code to support PCI bus devices.
744 bool " Supprt for 2nd PCI host controller"
745 depends on PCI && MPC834x
746 default y if MPC834x_SYS
750 depends on !4xx && !CPM2 && 8xx
753 Say Y here if you have a system based on a Motorola 8xx-series
754 embedded processor with a QSPAN PCI interface, otherwise say N.
758 depends on PCI && 8260
759 select PPC_INDIRECT_PCI
763 bool " Enable workaround for MPC826x erratum PCI 9"
764 depends on PCI_8260 && !ADS8272
768 prompt " IDMA channel for PCI 9 workaround"
771 config 8260_PCI9_IDMA1
774 config 8260_PCI9_IDMA2
777 config 8260_PCI9_IDMA3
780 config 8260_PCI9_IDMA4
785 source "drivers/pci/Kconfig"
787 source "drivers/pcmcia/Kconfig"
789 source "drivers/pci/hotplug/Kconfig"
793 menu "Advanced setup"
796 config ADVANCED_OPTIONS
797 bool "Prompt for advanced kernel configuration options"
799 This option will enable prompting for a variety of advanced kernel
800 configuration options. These options can cause the kernel to not
801 work if they are set incorrectly, but can be used to optimize certain
802 aspects of kernel memory management.
804 Unless you know what you are doing, say N here.
806 comment "Default settings for advanced configuration options are used"
807 depends on !ADVANCED_OPTIONS
809 config HIGHMEM_START_BOOL
810 bool "Set high memory pool address"
811 depends on ADVANCED_OPTIONS && HIGHMEM
813 This option allows you to set the base address of the kernel virtual
814 area used to map high memory pages. This can be useful in
815 optimizing the layout of kernel virtual memory.
817 Say N here unless you know what you are doing.
820 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
823 config LOWMEM_SIZE_BOOL
824 bool "Set maximum low memory"
825 depends on ADVANCED_OPTIONS
827 This option allows you to set the maximum amount of memory which
828 will be used as "low memory", that is, memory which the kernel can
829 access directly, without having to set up a kernel virtual mapping.
830 This can be useful in optimizing the layout of kernel virtual
833 Say N here unless you know what you are doing.
836 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
839 config KERNEL_START_BOOL
840 bool "Set custom kernel base address"
841 depends on ADVANCED_OPTIONS
843 This option allows you to set the kernel virtual address at which
844 the kernel will map low memory (the kernel image will be linked at
845 this address). This can be useful in optimizing the virtual memory
846 layout of the system.
848 Say N here unless you know what you are doing.
851 hex "Virtual address of kernel base" if KERNEL_START_BOOL
854 config TASK_SIZE_BOOL
855 bool "Set custom user task size"
856 depends on ADVANCED_OPTIONS
858 This option allows you to set the amount of virtual address space
859 allocated to user tasks. This can be useful in optimizing the
860 virtual memory layout of the system.
862 Say N here unless you know what you are doing.
865 hex "Size of user task space" if TASK_SIZE_BOOL
868 config CONSISTENT_START_BOOL
869 bool "Set custom consistent memory pool address"
870 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
872 This option allows you to set the base virtual address
873 of the the consistent memory pool. This pool of virtual
874 memory is used to make consistent memory allocations.
876 config CONSISTENT_START
877 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
878 default "0xff100000" if NOT_COHERENT_CACHE
880 config CONSISTENT_SIZE_BOOL
881 bool "Set custom consistent memory pool size"
882 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
884 This option allows you to set the size of the the
885 consistent memory pool. This pool of virtual memory
886 is used to make consistent memory allocations.
888 config CONSISTENT_SIZE
889 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
890 default "0x00200000" if NOT_COHERENT_CACHE
892 config BOOT_LOAD_BOOL
893 bool "Set the boot link/load address"
894 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
896 This option allows you to set the initial load address of the zImage
897 or zImage.initrd file. This can be useful if you are on a board
898 which has a small amount of memory.
900 Say N here unless you know what you are doing.
903 hex "Link/load address for booting" if BOOT_LOAD_BOOL
904 default "0x00400000" if 40x || 8xx || 8260
905 default "0x01000000" if 44x
909 bool "Pinned Kernel TLBs (860 ONLY)"
910 depends on ADVANCED_OPTIONS && 8xx
916 default "0xc000000000000000"
921 source "drivers/Kconfig"
925 # XXX source "arch/ppc/8xx_io/Kconfig"
927 # XXX source "arch/ppc/8260_io/Kconfig"
929 source "arch/powerpc/platforms/iseries/Kconfig"
933 menu "Instrumentation Support"
934 depends on EXPERIMENTAL
936 source "arch/powerpc/oprofile/Kconfig"
939 bool "Kprobes (EXPERIMENTAL)"
942 Kprobes allows you to trap at almost any kernel address and
943 execute a callback function. register_kprobe() establishes
944 a probepoint and specifies the callback. Kprobes is useful
945 for kernel debugging, non-intrusive instrumentation and testing.
946 If in doubt, say "N".
949 source "arch/powerpc/Kconfig.debug"
951 source "security/Kconfig"
955 depends on COMPAT && KEYS
958 source "crypto/Kconfig"