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 GENERIC_TBSYNC
307 bool " PowerPC Reference Platform (PReP) based machines"
308 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
310 select PPC_INDIRECT_PCI
314 depends on PPC_MULTIPLATFORM && PPC64
315 bool " Maple 970FX Evaluation Board"
317 select MPIC_BROKEN_U3
318 select GENERIC_TBSYNC
321 This option enables support for the Maple 970FX Evaluation Board.
322 For more informations, refer to <http://www.970eval.com>
325 bool " Cell Broadband Processor Architecture"
326 depends on PPC_MULTIPLATFORM && PPC64
332 depends on PPC_MULTIPLATFORM # for now
336 depends on PPC_PSERIES
342 depends on PPC_MULTIPLATFORM && PPC64
346 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
354 config RTAS_ERROR_LOGGING
360 bool "Proc interface to RTAS"
365 tristate "Firmware flash interface"
366 depends on PPC64 && RTAS_PROC
372 config MPIC_BROKEN_U3
383 depends on PPC_PSERIES || PPC_ISERIES
388 depends on PPC_PSERIES
389 bool "Support for GX bus based adapters"
392 Bus device driver for GX bus based adapters.
398 config GENERIC_TBSYNC
400 default y if CONFIG_PPC32 && CONFIG_SMP
403 source "drivers/cpufreq/Kconfig"
406 bool "Support for Apple PowerBooks"
407 depends on CPU_FREQ && ADB_PMU && PPC32
408 select CPU_FREQ_TABLE
410 This adds support for frequency switching on Apple PowerBooks,
411 this currently includes some models of iBook & Titanium
414 config CPU_FREQ_PMAC64
415 bool "Support for some Apple G5s"
416 depends on CPU_FREQ && PMAC_SMU && PPC64
417 select CPU_FREQ_TABLE
419 This adds support for frequency switching on Apple iMac G5,
420 and some of the more recent desktop G5 machines as well.
422 config PPC601_SYNC_FIX
423 bool "Workarounds for PPC601 bugs"
424 depends on 6xx && (PPC_PREP || PPC_PMAC)
426 Some versions of the PPC601 (the first PowerPC chip) have bugs which
427 mean that extra synchronization instructions are required near
428 certain instructions, typically those that make major changes to the
429 CPU state. These extra instructions reduce performance slightly.
430 If you say N here, these extra instructions will not be included,
431 resulting in a kernel which will run faster but may not run at all
432 on some systems with the PPC601 chip.
434 If in doubt, say Y here.
437 bool "Thermal Management Support"
440 G3 and G4 processors have an on-chip temperature sensor called the
441 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
442 temperature within 2-4 degrees Celsius. This option shows the current
443 on-die temperature in /proc/cpuinfo if the cpu supports it.
445 Unfortunately, on some chip revisions, this sensor is very inaccurate
446 and in some cases, does not work at all, so don't assume the cpu
447 temp is actually what /proc/cpuinfo says it is.
450 bool "Interrupt driven TAU driver (DANGEROUS)"
453 The TAU supports an interrupt driven mode which causes an interrupt
454 whenever the temperature goes out of range. This is the fastest way
455 to get notified the temp has exceeded a range. With this option off,
456 a timer is used to re-check the temperature periodically.
458 However, on some cpus it appears that the TAU interrupt hardware
459 is buggy and can cause a situation which would lead unexplained hard
462 Unless you are extending the TAU driver, or enjoy kernel/hardware
463 debugging, leave this option off.
466 bool "Average high and low temp"
469 The TAU hardware can compare the temperature to an upper and lower
470 bound. The default behavior is to show both the upper and lower
471 bound in /proc/cpuinfo. If the range is large, the temperature is
472 either changing a lot, or the TAU hardware is broken (likely on some
473 G4's). If the range is small (around 4 degrees), the temperature is
474 relatively stable. If you say Y here, a single temperature value,
475 halfway between the upper and lower bounds, will be reported in
478 If in doubt, say N here.
481 source arch/powerpc/platforms/embedded6xx/Kconfig
482 source arch/powerpc/platforms/4xx/Kconfig
483 source arch/powerpc/platforms/85xx/Kconfig
484 source arch/powerpc/platforms/8xx/Kconfig
486 menu "Kernel options"
489 bool "High memory support"
492 source kernel/Kconfig.hz
493 source kernel/Kconfig.preempt
494 source "fs/Kconfig.binfmt"
496 # We optimistically allocate largepages from the VM, so make the limit
497 # large enough (16MB). This badly named config option is actually
499 config FORCE_MAX_ZONEORDER
502 default "9" if PPC_64K_PAGES
505 config MATH_EMULATION
506 bool "Math emulation"
507 depends on 4xx || 8xx || E200 || E500
509 Some PowerPC chips designed for embedded applications do not have
510 a floating-point unit and therefore do not implement the
511 floating-point instructions in the PowerPC instruction set. If you
512 say Y here, the kernel will include code to emulate a floating-point
513 unit, which will allow programs that use floating-point
517 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
518 depends on EXPERIMENTAL && PPC64
521 Cause IO segments sent to a device for DMA to be merged virtually
522 by the IOMMU when they happen to have been allocated contiguously.
523 This doesn't add pressure to the IOMMU allocator. However, some
524 drivers don't support getting large merged segments coming back
525 from *_map_sg(). Say Y if you know the drivers you are using are
526 properly handling this case.
529 bool "Support for enabling/disabling CPUs"
530 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
532 Say Y here to be able to disable and re-enable individual
533 CPUs at runtime on SMP machines.
535 Say N if you are unsure.
538 bool "kexec system call (EXPERIMENTAL)"
539 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
541 kexec is a system call that implements the ability to shutdown your
542 current kernel, and to start another kernel. It is like a reboot
543 but it is indepedent of the system firmware. And like a reboot
544 you can start any kernel with it, not just Linux.
546 The name comes from the similiarity to the exec system call.
548 It is an ongoing process to be certain the hardware in a machine
549 is properly shutdown, so do not be surprised if this code does not
550 initially work for you. It may help to enable device hotplugging
551 support. As of this writing the exact hardware interface is
552 strongly in flux, so no good recommendation can be made.
556 depends on 8xx || 8260
560 bool "PC PS/2 style Keyboard"
561 depends on 4xx || CPM2
564 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
565 default y if PPC_PREP
568 bool "Distribute interrupts on all CPUs by default"
569 depends on SMP && !MV64360
571 This option gives the kernel permission to distribute IRQs across
572 multiple CPUs. Saying N here will route all IRQs to the first
573 CPU. Generally saying Y is safe, although some problems have been
574 reported with SMP Power Macintoshes with this option enabled.
576 source "arch/powerpc/platforms/pseries/Kconfig"
581 default y if SMP && PPC_PSERIES
583 config ARCH_SELECT_MEMORY_MODEL
587 config ARCH_FLATMEM_ENABLE
589 depends on PPC64 && !NUMA
591 config ARCH_SPARSEMEM_ENABLE
594 config ARCH_SPARSEMEM_DEFAULT
596 depends on SMP && PPC_PSERIES
600 config HAVE_ARCH_EARLY_PFN_TO_NID
602 depends on NEED_MULTIPLE_NODES
604 config ARCH_MEMORY_PROBE
606 depends on MEMORY_HOTPLUG
612 This option changes the kernel logical page size to 64k. On machines
613 without processor support for 64k pages, the kernel will simulate
614 them by loading each individual 4k page on demand transparently,
615 while on hardware with such support, it will be used to map
616 normal application pages.
619 bool "SMT (Hyperthreading) scheduler support"
620 depends on PPC64 && SMP
623 SMT scheduler support improves the CPU scheduler's decision making
624 when dealing with POWER5 cpus at a cost of slightly increased
625 overhead in some places. If unsure say N here.
627 config PROC_DEVICETREE
628 bool "Support for device tree in /proc"
631 This option adds a device-tree directory under /proc which contains
632 an image of the device tree that the kernel copies from Open
633 Firmware or other boot firmware. If unsure, say Y here.
635 source "arch/powerpc/platforms/prep/Kconfig"
638 bool "Default bootloader kernel arguments"
639 depends on !PPC_ISERIES
642 string "Initial kernel command string"
643 depends on CMDLINE_BOOL
644 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
646 On some platforms, there is currently no way for the boot loader to
647 pass arguments to the kernel. For these platforms, you can supply
648 some command-line options at build time by entering them here. In
649 most cases you will need to specify the root device here.
652 source kernel/power/Kconfig
656 bool "Enable seccomp to safely compute untrusted bytecode"
660 This kernel feature is useful for number crunching applications
661 that may need to compute untrusted bytecode during their
662 execution. By using pipes or other transports made available to
663 the process as file descriptors supporting the read/write
664 syscalls, it's possible to isolate those applications in
665 their own address space using seccomp. Once seccomp is
666 enabled via /proc/<pid>/seccomp, it cannot be disabled
667 and the task is only allowed to execute a few safe syscalls
668 defined by each seccomp mode.
670 If unsure, say Y. Only embedded should say N here.
681 bool "Support for ISA-bus hardware"
682 depends on PPC_PREP || PPC_CHRP
685 Find out whether you have ISA slots on your motherboard. ISA is the
686 name of a bus system, i.e. the way the CPU talks to the other stuff
687 inside your box. If you have an Apple machine, say N here; if you
688 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
689 you have an embedded board, consult your board documentation.
691 config GENERIC_ISA_DMA
693 depends on PPC64 || POWER4 || 6xx && !CPM2
701 config PPC_INDIRECT_PCI
704 default y if 40x || 44x || 85xx || 83xx
713 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
718 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
719 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
720 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
721 default PCI_QSPAN if !4xx && !CPM2 && 8xx
723 Find out whether your system includes a PCI bus. PCI is the name of
724 a bus system, i.e. the way the CPU talks to the other stuff inside
725 your box. If you say Y here, the kernel will include drivers and
726 infrastructure code to support PCI bus devices.
733 bool " Supprt for 2nd PCI host controller"
734 depends on PCI && MPC834x
735 default y if MPC834x_SYS
739 depends on !4xx && !CPM2 && 8xx
742 Say Y here if you have a system based on a Motorola 8xx-series
743 embedded processor with a QSPAN PCI interface, otherwise say N.
747 depends on PCI && 8260
748 select PPC_INDIRECT_PCI
752 bool " Enable workaround for MPC826x erratum PCI 9"
753 depends on PCI_8260 && !ADS8272
757 prompt " IDMA channel for PCI 9 workaround"
760 config 8260_PCI9_IDMA1
763 config 8260_PCI9_IDMA2
766 config 8260_PCI9_IDMA3
769 config 8260_PCI9_IDMA4
774 source "drivers/pci/Kconfig"
776 source "drivers/pcmcia/Kconfig"
778 source "drivers/pci/hotplug/Kconfig"
782 menu "Advanced setup"
785 config ADVANCED_OPTIONS
786 bool "Prompt for advanced kernel configuration options"
788 This option will enable prompting for a variety of advanced kernel
789 configuration options. These options can cause the kernel to not
790 work if they are set incorrectly, but can be used to optimize certain
791 aspects of kernel memory management.
793 Unless you know what you are doing, say N here.
795 comment "Default settings for advanced configuration options are used"
796 depends on !ADVANCED_OPTIONS
798 config HIGHMEM_START_BOOL
799 bool "Set high memory pool address"
800 depends on ADVANCED_OPTIONS && HIGHMEM
802 This option allows you to set the base address of the kernel virtual
803 area used to map high memory pages. This can be useful in
804 optimizing the layout of kernel virtual memory.
806 Say N here unless you know what you are doing.
809 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
812 config LOWMEM_SIZE_BOOL
813 bool "Set maximum low memory"
814 depends on ADVANCED_OPTIONS
816 This option allows you to set the maximum amount of memory which
817 will be used as "low memory", that is, memory which the kernel can
818 access directly, without having to set up a kernel virtual mapping.
819 This can be useful in optimizing the layout of kernel virtual
822 Say N here unless you know what you are doing.
825 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
828 config KERNEL_START_BOOL
829 bool "Set custom kernel base address"
830 depends on ADVANCED_OPTIONS
832 This option allows you to set the kernel virtual address at which
833 the kernel will map low memory (the kernel image will be linked at
834 this address). This can be useful in optimizing the virtual memory
835 layout of the system.
837 Say N here unless you know what you are doing.
840 hex "Virtual address of kernel base" if KERNEL_START_BOOL
843 config TASK_SIZE_BOOL
844 bool "Set custom user task size"
845 depends on ADVANCED_OPTIONS
847 This option allows you to set the amount of virtual address space
848 allocated to user tasks. This can be useful in optimizing the
849 virtual memory layout of the system.
851 Say N here unless you know what you are doing.
854 hex "Size of user task space" if TASK_SIZE_BOOL
857 config CONSISTENT_START_BOOL
858 bool "Set custom consistent memory pool address"
859 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
861 This option allows you to set the base virtual address
862 of the the consistent memory pool. This pool of virtual
863 memory is used to make consistent memory allocations.
865 config CONSISTENT_START
866 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
867 default "0xff100000" if NOT_COHERENT_CACHE
869 config CONSISTENT_SIZE_BOOL
870 bool "Set custom consistent memory pool size"
871 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
873 This option allows you to set the size of the the
874 consistent memory pool. This pool of virtual memory
875 is used to make consistent memory allocations.
877 config CONSISTENT_SIZE
878 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
879 default "0x00200000" if NOT_COHERENT_CACHE
881 config BOOT_LOAD_BOOL
882 bool "Set the boot link/load address"
883 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
885 This option allows you to set the initial load address of the zImage
886 or zImage.initrd file. This can be useful if you are on a board
887 which has a small amount of memory.
889 Say N here unless you know what you are doing.
892 hex "Link/load address for booting" if BOOT_LOAD_BOOL
893 default "0x00400000" if 40x || 8xx || 8260
894 default "0x01000000" if 44x
898 bool "Pinned Kernel TLBs (860 ONLY)"
899 depends on ADVANCED_OPTIONS && 8xx
905 default "0xc000000000000000"
910 source "drivers/Kconfig"
914 # XXX source "arch/ppc/8xx_io/Kconfig"
916 # XXX source "arch/ppc/8260_io/Kconfig"
918 source "arch/powerpc/platforms/iseries/Kconfig"
922 menu "Instrumentation Support"
923 depends on EXPERIMENTAL
925 source "arch/powerpc/oprofile/Kconfig"
928 bool "Kprobes (EXPERIMENTAL)"
931 Kprobes allows you to trap at almost any kernel address and
932 execute a callback function. register_kprobe() establishes
933 a probepoint and specifies the callback. Kprobes is useful
934 for kernel debugging, non-intrusive instrumentation and testing.
935 If in doubt, say "N".
938 source "arch/powerpc/Kconfig.debug"
940 source "security/Kconfig"
944 depends on COMPAT && KEYS
947 source "crypto/Kconfig"