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 (2-32)"
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
391 config GENERIC_TBSYNC
393 default y if CONFIG_PPC32 && CONFIG_SMP
396 source "drivers/cpufreq/Kconfig"
399 bool "Support for Apple PowerBooks"
400 depends on CPU_FREQ && ADB_PMU && PPC32
401 select CPU_FREQ_TABLE
403 This adds support for frequency switching on Apple PowerBooks,
404 this currently includes some models of iBook & Titanium
407 config CPU_FREQ_PMAC64
408 bool "Support for some Apple G5s"
409 depends on CPU_FREQ && PMAC_SMU && PPC64
410 select CPU_FREQ_TABLE
412 This adds support for frequency switching on Apple iMac G5,
413 and some of the more recent desktop G5 machines as well.
415 config PPC601_SYNC_FIX
416 bool "Workarounds for PPC601 bugs"
417 depends on 6xx && (PPC_PREP || PPC_PMAC)
419 Some versions of the PPC601 (the first PowerPC chip) have bugs which
420 mean that extra synchronization instructions are required near
421 certain instructions, typically those that make major changes to the
422 CPU state. These extra instructions reduce performance slightly.
423 If you say N here, these extra instructions will not be included,
424 resulting in a kernel which will run faster but may not run at all
425 on some systems with the PPC601 chip.
427 If in doubt, say Y here.
430 bool "Thermal Management Support"
433 G3 and G4 processors have an on-chip temperature sensor called the
434 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
435 temperature within 2-4 degrees Celsius. This option shows the current
436 on-die temperature in /proc/cpuinfo if the cpu supports it.
438 Unfortunately, on some chip revisions, this sensor is very inaccurate
439 and in some cases, does not work at all, so don't assume the cpu
440 temp is actually what /proc/cpuinfo says it is.
443 bool "Interrupt driven TAU driver (DANGEROUS)"
446 The TAU supports an interrupt driven mode which causes an interrupt
447 whenever the temperature goes out of range. This is the fastest way
448 to get notified the temp has exceeded a range. With this option off,
449 a timer is used to re-check the temperature periodically.
451 However, on some cpus it appears that the TAU interrupt hardware
452 is buggy and can cause a situation which would lead unexplained hard
455 Unless you are extending the TAU driver, or enjoy kernel/hardware
456 debugging, leave this option off.
459 bool "Average high and low temp"
462 The TAU hardware can compare the temperature to an upper and lower
463 bound. The default behavior is to show both the upper and lower
464 bound in /proc/cpuinfo. If the range is large, the temperature is
465 either changing a lot, or the TAU hardware is broken (likely on some
466 G4's). If the range is small (around 4 degrees), the temperature is
467 relatively stable. If you say Y here, a single temperature value,
468 halfway between the upper and lower bounds, will be reported in
471 If in doubt, say N here.
474 source arch/powerpc/platforms/embedded6xx/Kconfig
475 source arch/powerpc/platforms/4xx/Kconfig
476 source arch/powerpc/platforms/85xx/Kconfig
477 source arch/powerpc/platforms/8xx/Kconfig
479 menu "Kernel options"
482 bool "High memory support"
485 source kernel/Kconfig.hz
486 source kernel/Kconfig.preempt
487 source "fs/Kconfig.binfmt"
489 # We optimistically allocate largepages from the VM, so make the limit
490 # large enough (16MB). This badly named config option is actually
492 config FORCE_MAX_ZONEORDER
495 default "9" if PPC_64K_PAGES
498 config MATH_EMULATION
499 bool "Math emulation"
500 depends on 4xx || 8xx || E200 || E500
502 Some PowerPC chips designed for embedded applications do not have
503 a floating-point unit and therefore do not implement the
504 floating-point instructions in the PowerPC instruction set. If you
505 say Y here, the kernel will include code to emulate a floating-point
506 unit, which will allow programs that use floating-point
510 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
511 depends on EXPERIMENTAL && PPC64
514 Cause IO segments sent to a device for DMA to be merged virtually
515 by the IOMMU when they happen to have been allocated contiguously.
516 This doesn't add pressure to the IOMMU allocator. However, some
517 drivers don't support getting large merged segments coming back
518 from *_map_sg(). Say Y if you know the drivers you are using are
519 properly handling this case.
522 bool "Support for enabling/disabling CPUs"
523 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
525 Say Y here to be able to disable and re-enable individual
526 CPUs at runtime on SMP machines.
528 Say N if you are unsure.
531 bool "kexec system call (EXPERIMENTAL)"
532 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
534 kexec is a system call that implements the ability to shutdown your
535 current kernel, and to start another kernel. It is like a reboot
536 but it is indepedent of the system firmware. And like a reboot
537 you can start any kernel with it, not just Linux.
539 The name comes from the similiarity to the exec system call.
541 It is an ongoing process to be certain the hardware in a machine
542 is properly shutdown, so do not be surprised if this code does not
543 initially work for you. It may help to enable device hotplugging
544 support. As of this writing the exact hardware interface is
545 strongly in flux, so no good recommendation can be made.
549 depends on 8xx || 8260
553 bool "PC PS/2 style Keyboard"
554 depends on 4xx || CPM2
557 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
558 default y if PPC_PREP
561 bool "Distribute interrupts on all CPUs by default"
562 depends on SMP && !MV64360
564 This option gives the kernel permission to distribute IRQs across
565 multiple CPUs. Saying N here will route all IRQs to the first
566 CPU. Generally saying Y is safe, although some problems have been
567 reported with SMP Power Macintoshes with this option enabled.
569 source "arch/powerpc/platforms/pseries/Kconfig"
574 default y if SMP && PPC_PSERIES
576 config ARCH_SELECT_MEMORY_MODEL
580 config ARCH_FLATMEM_ENABLE
582 depends on PPC64 && !NUMA
584 config ARCH_SPARSEMEM_ENABLE
587 config ARCH_SPARSEMEM_DEFAULT
589 depends on SMP && PPC_PSERIES
593 config HAVE_ARCH_EARLY_PFN_TO_NID
595 depends on NEED_MULTIPLE_NODES
597 config ARCH_MEMORY_PROBE
599 depends on MEMORY_HOTPLUG
605 This option changes the kernel logical page size to 64k. On machines
606 without processor support for 64k pages, the kernel will simulate
607 them by loading each individual 4k page on demand transparently,
608 while on hardware with such support, it will be used to map
609 normal application pages.
612 bool "SMT (Hyperthreading) scheduler support"
613 depends on PPC64 && SMP
616 SMT scheduler support improves the CPU scheduler's decision making
617 when dealing with POWER5 cpus at a cost of slightly increased
618 overhead in some places. If unsure say N here.
620 config PROC_DEVICETREE
621 bool "Support for device tree in /proc"
624 This option adds a device-tree directory under /proc which contains
625 an image of the device tree that the kernel copies from Open
626 Firmware or other boot firmware. If unsure, say Y here.
628 source "arch/powerpc/platforms/prep/Kconfig"
631 bool "Default bootloader kernel arguments"
632 depends on !PPC_ISERIES
635 string "Initial kernel command string"
636 depends on CMDLINE_BOOL
637 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
639 On some platforms, there is currently no way for the boot loader to
640 pass arguments to the kernel. For these platforms, you can supply
641 some command-line options at build time by entering them here. In
642 most cases you will need to specify the root device here.
645 source kernel/power/Kconfig
649 bool "Enable seccomp to safely compute untrusted bytecode"
653 This kernel feature is useful for number crunching applications
654 that may need to compute untrusted bytecode during their
655 execution. By using pipes or other transports made available to
656 the process as file descriptors supporting the read/write
657 syscalls, it's possible to isolate those applications in
658 their own address space using seccomp. Once seccomp is
659 enabled via /proc/<pid>/seccomp, it cannot be disabled
660 and the task is only allowed to execute a few safe syscalls
661 defined by each seccomp mode.
663 If unsure, say Y. Only embedded should say N here.
674 bool "Support for ISA-bus hardware"
675 depends on PPC_PREP || PPC_CHRP
678 Find out whether you have ISA slots on your motherboard. ISA is the
679 name of a bus system, i.e. the way the CPU talks to the other stuff
680 inside your box. If you have an Apple machine, say N here; if you
681 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
682 you have an embedded board, consult your board documentation.
684 config GENERIC_ISA_DMA
686 depends on PPC64 || POWER4 || 6xx && !CPM2
694 config PPC_INDIRECT_PCI
697 default y if 40x || 44x || 85xx || 83xx
706 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
711 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
712 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
713 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
714 default PCI_QSPAN if !4xx && !CPM2 && 8xx
716 Find out whether your system includes a PCI bus. PCI is the name of
717 a bus system, i.e. the way the CPU talks to the other stuff inside
718 your box. If you say Y here, the kernel will include drivers and
719 infrastructure code to support PCI bus devices.
726 bool " Supprt for 2nd PCI host controller"
727 depends on PCI && MPC834x
728 default y if MPC834x_SYS
732 depends on !4xx && !CPM2 && 8xx
735 Say Y here if you have a system based on a Motorola 8xx-series
736 embedded processor with a QSPAN PCI interface, otherwise say N.
740 depends on PCI && 8260
741 select PPC_INDIRECT_PCI
745 bool " Enable workaround for MPC826x erratum PCI 9"
746 depends on PCI_8260 && !ADS8272
750 prompt " IDMA channel for PCI 9 workaround"
753 config 8260_PCI9_IDMA1
756 config 8260_PCI9_IDMA2
759 config 8260_PCI9_IDMA3
762 config 8260_PCI9_IDMA4
767 source "drivers/pci/Kconfig"
769 source "drivers/pcmcia/Kconfig"
771 source "drivers/pci/hotplug/Kconfig"
775 menu "Advanced setup"
778 config ADVANCED_OPTIONS
779 bool "Prompt for advanced kernel configuration options"
781 This option will enable prompting for a variety of advanced kernel
782 configuration options. These options can cause the kernel to not
783 work if they are set incorrectly, but can be used to optimize certain
784 aspects of kernel memory management.
786 Unless you know what you are doing, say N here.
788 comment "Default settings for advanced configuration options are used"
789 depends on !ADVANCED_OPTIONS
791 config HIGHMEM_START_BOOL
792 bool "Set high memory pool address"
793 depends on ADVANCED_OPTIONS && HIGHMEM
795 This option allows you to set the base address of the kernel virtual
796 area used to map high memory pages. This can be useful in
797 optimizing the layout of kernel virtual memory.
799 Say N here unless you know what you are doing.
802 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
805 config LOWMEM_SIZE_BOOL
806 bool "Set maximum low memory"
807 depends on ADVANCED_OPTIONS
809 This option allows you to set the maximum amount of memory which
810 will be used as "low memory", that is, memory which the kernel can
811 access directly, without having to set up a kernel virtual mapping.
812 This can be useful in optimizing the layout of kernel virtual
815 Say N here unless you know what you are doing.
818 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
821 config KERNEL_START_BOOL
822 bool "Set custom kernel base address"
823 depends on ADVANCED_OPTIONS
825 This option allows you to set the kernel virtual address at which
826 the kernel will map low memory (the kernel image will be linked at
827 this address). This can be useful in optimizing the virtual memory
828 layout of the system.
830 Say N here unless you know what you are doing.
833 hex "Virtual address of kernel base" if KERNEL_START_BOOL
836 config TASK_SIZE_BOOL
837 bool "Set custom user task size"
838 depends on ADVANCED_OPTIONS
840 This option allows you to set the amount of virtual address space
841 allocated to user tasks. This can be useful in optimizing the
842 virtual memory layout of the system.
844 Say N here unless you know what you are doing.
847 hex "Size of user task space" if TASK_SIZE_BOOL
850 config CONSISTENT_START_BOOL
851 bool "Set custom consistent memory pool address"
852 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
854 This option allows you to set the base virtual address
855 of the the consistent memory pool. This pool of virtual
856 memory is used to make consistent memory allocations.
858 config CONSISTENT_START
859 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
860 default "0xff100000" if NOT_COHERENT_CACHE
862 config CONSISTENT_SIZE_BOOL
863 bool "Set custom consistent memory pool size"
864 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
866 This option allows you to set the size of the the
867 consistent memory pool. This pool of virtual memory
868 is used to make consistent memory allocations.
870 config CONSISTENT_SIZE
871 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
872 default "0x00200000" if NOT_COHERENT_CACHE
874 config BOOT_LOAD_BOOL
875 bool "Set the boot link/load address"
876 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
878 This option allows you to set the initial load address of the zImage
879 or zImage.initrd file. This can be useful if you are on a board
880 which has a small amount of memory.
882 Say N here unless you know what you are doing.
885 hex "Link/load address for booting" if BOOT_LOAD_BOOL
886 default "0x00400000" if 40x || 8xx || 8260
887 default "0x01000000" if 44x
891 bool "Pinned Kernel TLBs (860 ONLY)"
892 depends on ADVANCED_OPTIONS && 8xx
898 default "0xc000000000000000"
903 source "drivers/Kconfig"
907 # XXX source "arch/ppc/8xx_io/Kconfig"
909 # XXX source "arch/ppc/8260_io/Kconfig"
911 source "arch/powerpc/platforms/iseries/Kconfig"
915 menu "Instrumentation Support"
916 depends on EXPERIMENTAL
918 source "arch/powerpc/oprofile/Kconfig"
921 bool "Kprobes (EXPERIMENTAL)"
924 Kprobes allows you to trap at almost any kernel address and
925 execute a callback function. register_kprobe() establishes
926 a probepoint and specifies the callback. Kprobes is useful
927 for kernel debugging, non-intrusive instrumentation and testing.
928 If in doubt, say "N".
931 source "arch/powerpc/Kconfig.debug"
933 source "security/Kconfig"
937 depends on COMPAT && KEYS
940 source "crypto/Kconfig"