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_CALIBRATE_DELAY
58 depends on COMPAT && SYSVIPC
61 # All PPC32s use generic nvram driver through ppc_md
66 config SCHED_NO_NO_OMIT_FRAME_POINTER
70 config ARCH_MAY_HAVE_PC_FDC
83 default y if PPC32 && SMP
89 Used to allow a board to specify it wants a uImage built by default
92 menu "Processor support"
94 prompt "Processor Type"
103 There are four families of PowerPC chips supported. The more common
104 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
105 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
106 embedded versions (403 and 405) and the high end 64 bit Power
107 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
109 Unless you are building a kernel for one of the embedded processor
110 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
111 Note that the kernel runs in 32-bit mode even on 64-bit chips.
114 bool "Freescale 52xx"
119 bool "Freescale 82xx"
124 bool "Freescale 83xx"
131 bool "Freescale 85xx"
146 bool "Freescale e200"
151 bool "Optimize for POWER4"
155 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
156 The resulting binary will not work on POWER3 or RS64 processors
157 when compiled with binutils 2.15 or later.
162 default y if !POWER4_ONLY
171 # this is temp to handle compat with arch=ppc
175 # this is temp to handle compat with arch=ppc
188 depends on E200 || E500
193 depends on E200 || E500
198 depends on 44x || E500
200 default y if E500 && PHYS_64BIT
203 bool 'Large physical address support' if E500
204 depends on 44x || E500
207 This option enables kernel support for larger than 32-bit physical
208 addresses. This features is not be available on all e500 cores.
210 If in doubt, say N here.
213 bool "AltiVec Support"
214 depends on CLASSIC32 || POWER4
216 This option enables kernel support for the Altivec extensions to the
217 PowerPC processor. The kernel currently supports saving and restoring
218 altivec registers, and turning on the 'altivec enable' bit so user
219 processes can execute altivec instructions.
221 This option is only usefully if you have a processor that supports
222 altivec (G4, otherwise known as 74xx series), but does not have
223 any affect on a non-altivec cpu (it does, however add code to the
226 If in doubt, say Y here.
230 depends on E200 || E500
233 This option enables kernel support for the Signal Processing
234 Extensions (SPE) to the PowerPC processor. The kernel currently
235 supports saving and restoring SPE registers, and turning on the
236 'spe enable' bit so user processes can execute SPE instructions.
238 This option is only useful if you have a processor that supports
239 SPE (e500, otherwise known as 85xx series), but does not have any
240 effect on a non-spe cpu (it does, however add code to the kernel).
242 If in doubt, say Y here.
246 depends on 6xx || POWER3 || POWER4 || PPC64
249 config PPC_STD_MMU_32
251 depends on PPC_STD_MMU && PPC32
254 depends on PPC_STD_MMU
255 bool "Symmetric multi-processing support"
257 This enables support for systems with more than one CPU. If you have
258 a system with only one CPU, say N. If you have a system with more
259 than one CPU, say Y. Note that the kernel does not currently
260 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
261 since they have inadequate hardware support for multiprocessor
264 If you say N here, the kernel will run on single and multiprocessor
265 machines, but will use only one CPU of a multiprocessor machine. If
266 you say Y here, the kernel will run on single-processor machines.
267 On a single-processor machine, the kernel will run faster if you say
270 If you don't know what to do here, say N.
273 int "Maximum number of CPUs (2-128)"
276 default "32" if PPC64
279 config NOT_COHERENT_CACHE
281 depends on 4xx || 8xx || E200
285 source "init/Kconfig"
287 menu "Platform support"
288 depends on PPC64 || CLASSIC32
291 prompt "Machine type"
292 default PPC_MULTIPLATFORM
294 config PPC_MULTIPLATFORM
295 bool "Generic desktop/server/laptop"
297 Select this option if configuring for an IBM pSeries or
298 RS/6000 machine, an Apple machine, or a PReP, CHRP,
299 Maple or Cell-based machine.
302 bool "IBM Legacy iSeries"
306 bool "Embedded 6xx/7xx/7xxx-based board"
307 depends on PPC32 && BROKEN
311 depends on PPC32 && BROKEN
313 Select APUS if configuring for a PowerUP Amiga.
314 More information is available at:
315 <http://linux-apus.sourceforge.net/>.
319 depends on PPC_MULTIPLATFORM && PPC64
320 bool " IBM pSeries & new (POWER5-based) iSeries"
323 select RTAS_ERROR_LOGGING
324 select PPC_UDBG_16550
328 bool " Common Hardware Reference Platform (CHRP) based machines"
329 depends on PPC_MULTIPLATFORM && PPC32
331 select PPC_INDIRECT_PCI
334 select PPC_UDBG_16550
338 bool " Apple PowerMac based machines"
339 depends on PPC_MULTIPLATFORM
340 select PPC_INDIRECT_PCI if PPC32
341 select PPC_MPC106 if PPC32
346 depends on PPC_PMAC && POWER4
348 select MPIC_BROKEN_U3
349 select GENERIC_TBSYNC
353 bool " PowerPC Reference Platform (PReP) based machines"
354 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
356 select PPC_INDIRECT_PCI
357 select PPC_UDBG_16550
361 depends on PPC_MULTIPLATFORM && PPC64
362 bool " Maple 970FX Evaluation Board"
364 select MPIC_BROKEN_U3
365 select GENERIC_TBSYNC
366 select PPC_UDBG_16550
369 This option enables support for the Maple 970FX Evaluation Board.
370 For more informations, refer to <http://www.970eval.com>
373 bool " Cell Broadband Processor Architecture"
374 depends on PPC_MULTIPLATFORM && PPC64
377 select PPC_UDBG_16550
380 depends on PPC_PSERIES
386 depends on PPC_MULTIPLATFORM && PPC64
390 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
398 config RTAS_ERROR_LOGGING
404 bool "Proc interface to RTAS"
409 tristate "Firmware flash interface"
410 depends on PPC64 && RTAS_PROC
416 config MPIC_BROKEN_U3
427 depends on PPC_PSERIES || PPC_ISERIES
432 depends on PPC_PSERIES
433 bool "Support for GX bus based adapters"
435 Bus device driver for GX bus based adapters.
441 source "drivers/cpufreq/Kconfig"
444 bool "Support for Apple PowerBooks"
445 depends on CPU_FREQ && ADB_PMU && PPC32
446 select CPU_FREQ_TABLE
448 This adds support for frequency switching on Apple PowerBooks,
449 this currently includes some models of iBook & Titanium
452 config CPU_FREQ_PMAC64
453 bool "Support for some Apple G5s"
454 depends on CPU_FREQ && PMAC_SMU && PPC64
455 select CPU_FREQ_TABLE
457 This adds support for frequency switching on Apple iMac G5,
458 and some of the more recent desktop G5 machines as well.
460 config PPC601_SYNC_FIX
461 bool "Workarounds for PPC601 bugs"
462 depends on 6xx && (PPC_PREP || PPC_PMAC)
464 Some versions of the PPC601 (the first PowerPC chip) have bugs which
465 mean that extra synchronization instructions are required near
466 certain instructions, typically those that make major changes to the
467 CPU state. These extra instructions reduce performance slightly.
468 If you say N here, these extra instructions will not be included,
469 resulting in a kernel which will run faster but may not run at all
470 on some systems with the PPC601 chip.
472 If in doubt, say Y here.
475 bool "Thermal Management Support"
478 G3 and G4 processors have an on-chip temperature sensor called the
479 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
480 temperature within 2-4 degrees Celsius. This option shows the current
481 on-die temperature in /proc/cpuinfo if the cpu supports it.
483 Unfortunately, on some chip revisions, this sensor is very inaccurate
484 and in some cases, does not work at all, so don't assume the cpu
485 temp is actually what /proc/cpuinfo says it is.
488 bool "Interrupt driven TAU driver (DANGEROUS)"
491 The TAU supports an interrupt driven mode which causes an interrupt
492 whenever the temperature goes out of range. This is the fastest way
493 to get notified the temp has exceeded a range. With this option off,
494 a timer is used to re-check the temperature periodically.
496 However, on some cpus it appears that the TAU interrupt hardware
497 is buggy and can cause a situation which would lead unexplained hard
500 Unless you are extending the TAU driver, or enjoy kernel/hardware
501 debugging, leave this option off.
504 bool "Average high and low temp"
507 The TAU hardware can compare the temperature to an upper and lower
508 bound. The default behavior is to show both the upper and lower
509 bound in /proc/cpuinfo. If the range is large, the temperature is
510 either changing a lot, or the TAU hardware is broken (likely on some
511 G4's). If the range is small (around 4 degrees), the temperature is
512 relatively stable. If you say Y here, a single temperature value,
513 halfway between the upper and lower bounds, will be reported in
516 If in doubt, say N here.
519 source arch/powerpc/platforms/embedded6xx/Kconfig
520 source arch/powerpc/platforms/4xx/Kconfig
521 source arch/powerpc/platforms/83xx/Kconfig
522 source arch/powerpc/platforms/85xx/Kconfig
523 source arch/powerpc/platforms/8xx/Kconfig
524 source arch/powerpc/platforms/cell/Kconfig
526 menu "Kernel options"
529 bool "High memory support"
532 source kernel/Kconfig.hz
533 source kernel/Kconfig.preempt
534 source "fs/Kconfig.binfmt"
536 # We optimistically allocate largepages from the VM, so make the limit
537 # large enough (16MB). This badly named config option is actually
539 config FORCE_MAX_ZONEORDER
542 default "9" if PPC_64K_PAGES
545 config MATH_EMULATION
546 bool "Math emulation"
547 depends on 4xx || 8xx || E200 || E500
549 Some PowerPC chips designed for embedded applications do not have
550 a floating-point unit and therefore do not implement the
551 floating-point instructions in the PowerPC instruction set. If you
552 say Y here, the kernel will include code to emulate a floating-point
553 unit, which will allow programs that use floating-point
557 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
558 depends on EXPERIMENTAL && PPC64
561 Cause IO segments sent to a device for DMA to be merged virtually
562 by the IOMMU when they happen to have been allocated contiguously.
563 This doesn't add pressure to the IOMMU allocator. However, some
564 drivers don't support getting large merged segments coming back
565 from *_map_sg(). Say Y if you know the drivers you are using are
566 properly handling this case.
569 bool "Support for enabling/disabling CPUs"
570 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
572 Say Y here to be able to disable and re-enable individual
573 CPUs at runtime on SMP machines.
575 Say N if you are unsure.
578 bool "kexec system call (EXPERIMENTAL)"
579 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
581 kexec is a system call that implements the ability to shutdown your
582 current kernel, and to start another kernel. It is like a reboot
583 but it is indepedent of the system firmware. And like a reboot
584 you can start any kernel with it, not just Linux.
586 The name comes from the similiarity to the exec system call.
588 It is an ongoing process to be certain the hardware in a machine
589 is properly shutdown, so do not be surprised if this code does not
590 initially work for you. It may help to enable device hotplugging
591 support. As of this writing the exact hardware interface is
592 strongly in flux, so no good recommendation can be made.
595 bool "kernel crash dumps (EXPERIMENTAL)"
596 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
598 Build a kernel suitable for use as a kdump capture kernel.
599 The kernel will be linked at a different address than normal, and
600 so can only be used for Kdump.
602 Don't change this unless you know what you are doing.
606 depends on 8xx || 8260
610 bool "PC PS/2 style Keyboard"
611 depends on 4xx || CPM2
614 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
615 default y if PPC_PREP
618 bool "Distribute interrupts on all CPUs by default"
619 depends on SMP && !MV64360
621 This option gives the kernel permission to distribute IRQs across
622 multiple CPUs. Saying N here will route all IRQs to the first
623 CPU. Generally saying Y is safe, although some problems have been
624 reported with SMP Power Macintoshes with this option enabled.
626 source "arch/powerpc/platforms/pseries/Kconfig"
631 default y if SMP && PPC_PSERIES
633 config ARCH_SELECT_MEMORY_MODEL
637 config ARCH_FLATMEM_ENABLE
639 depends on (PPC64 && !NUMA) || PPC32
641 config ARCH_SPARSEMEM_ENABLE
645 config ARCH_SPARSEMEM_DEFAULT
647 depends on SMP && PPC_PSERIES
651 config HAVE_ARCH_EARLY_PFN_TO_NID
653 depends on NEED_MULTIPLE_NODES
655 config ARCH_MEMORY_PROBE
657 depends on MEMORY_HOTPLUG
663 This option changes the kernel logical page size to 64k. On machines
664 without processor support for 64k pages, the kernel will simulate
665 them by loading each individual 4k page on demand transparently,
666 while on hardware with such support, it will be used to map
667 normal application pages.
670 bool "SMT (Hyperthreading) scheduler support"
671 depends on PPC64 && SMP
674 SMT scheduler support improves the CPU scheduler's decision making
675 when dealing with POWER5 cpus at a cost of slightly increased
676 overhead in some places. If unsure say N here.
678 config PROC_DEVICETREE
679 bool "Support for device tree in /proc"
682 This option adds a device-tree directory under /proc which contains
683 an image of the device tree that the kernel copies from Open
684 Firmware or other boot firmware. If unsure, say Y here.
686 source "arch/powerpc/platforms/prep/Kconfig"
689 bool "Default bootloader kernel arguments"
690 depends on !PPC_ISERIES
693 string "Initial kernel command string"
694 depends on CMDLINE_BOOL
695 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
697 On some platforms, there is currently no way for the boot loader to
698 pass arguments to the kernel. For these platforms, you can supply
699 some command-line options at build time by entering them here. In
700 most cases you will need to specify the root device here.
703 source kernel/power/Kconfig
707 bool "Enable seccomp to safely compute untrusted bytecode"
711 This kernel feature is useful for number crunching applications
712 that may need to compute untrusted bytecode during their
713 execution. By using pipes or other transports made available to
714 the process as file descriptors supporting the read/write
715 syscalls, it's possible to isolate those applications in
716 their own address space using seccomp. Once seccomp is
717 enabled via /proc/<pid>/seccomp, it cannot be disabled
718 and the task is only allowed to execute a few safe syscalls
719 defined by each seccomp mode.
721 If unsure, say Y. Only embedded should say N here.
732 bool "Support for ISA-bus hardware"
733 depends on PPC_PREP || PPC_CHRP
736 Find out whether you have ISA slots on your motherboard. ISA is the
737 name of a bus system, i.e. the way the CPU talks to the other stuff
738 inside your box. If you have an Apple machine, say N here; if you
739 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
740 you have an embedded board, consult your board documentation.
742 config GENERIC_ISA_DMA
744 depends on PPC64 || POWER4 || 6xx && !CPM2
751 config PPC_INDIRECT_PCI
754 default y if 40x || 44x
766 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
771 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
772 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx
773 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
774 default PCI_QSPAN if !4xx && !CPM2 && 8xx
776 Find out whether your system includes a PCI bus. PCI is the name of
777 a bus system, i.e. the way the CPU talks to the other stuff inside
778 your box. If you say Y here, the kernel will include drivers and
779 infrastructure code to support PCI bus devices.
787 depends on !4xx && !CPM2 && 8xx
790 Say Y here if you have a system based on a Motorola 8xx-series
791 embedded processor with a QSPAN PCI interface, otherwise say N.
795 depends on PCI && 8260
796 select PPC_INDIRECT_PCI
800 bool " Enable workaround for MPC826x erratum PCI 9"
801 depends on PCI_8260 && !ADS8272
805 prompt " IDMA channel for PCI 9 workaround"
808 config 8260_PCI9_IDMA1
811 config 8260_PCI9_IDMA2
814 config 8260_PCI9_IDMA3
817 config 8260_PCI9_IDMA4
822 source "drivers/pci/Kconfig"
824 source "drivers/pcmcia/Kconfig"
826 source "drivers/pci/hotplug/Kconfig"
830 menu "Advanced setup"
833 config ADVANCED_OPTIONS
834 bool "Prompt for advanced kernel configuration options"
836 This option will enable prompting for a variety of advanced kernel
837 configuration options. These options can cause the kernel to not
838 work if they are set incorrectly, but can be used to optimize certain
839 aspects of kernel memory management.
841 Unless you know what you are doing, say N here.
843 comment "Default settings for advanced configuration options are used"
844 depends on !ADVANCED_OPTIONS
846 config HIGHMEM_START_BOOL
847 bool "Set high memory pool address"
848 depends on ADVANCED_OPTIONS && HIGHMEM
850 This option allows you to set the base address of the kernel virtual
851 area used to map high memory pages. This can be useful in
852 optimizing the layout of kernel virtual memory.
854 Say N here unless you know what you are doing.
857 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
860 config LOWMEM_SIZE_BOOL
861 bool "Set maximum low memory"
862 depends on ADVANCED_OPTIONS
864 This option allows you to set the maximum amount of memory which
865 will be used as "low memory", that is, memory which the kernel can
866 access directly, without having to set up a kernel virtual mapping.
867 This can be useful in optimizing the layout of kernel virtual
870 Say N here unless you know what you are doing.
873 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
876 config KERNEL_START_BOOL
877 bool "Set custom kernel base address"
878 depends on ADVANCED_OPTIONS
880 This option allows you to set the kernel virtual address at which
881 the kernel will map low memory (the kernel image will be linked at
882 this address). This can be useful in optimizing the virtual memory
883 layout of the system.
885 Say N here unless you know what you are doing.
888 hex "Virtual address of kernel base" if KERNEL_START_BOOL
891 config TASK_SIZE_BOOL
892 bool "Set custom user task size"
893 depends on ADVANCED_OPTIONS
895 This option allows you to set the amount of virtual address space
896 allocated to user tasks. This can be useful in optimizing the
897 virtual memory layout of the system.
899 Say N here unless you know what you are doing.
902 hex "Size of user task space" if TASK_SIZE_BOOL
905 config CONSISTENT_START_BOOL
906 bool "Set custom consistent memory pool address"
907 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
909 This option allows you to set the base virtual address
910 of the the consistent memory pool. This pool of virtual
911 memory is used to make consistent memory allocations.
913 config CONSISTENT_START
914 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
915 default "0xff100000" if NOT_COHERENT_CACHE
917 config CONSISTENT_SIZE_BOOL
918 bool "Set custom consistent memory pool size"
919 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
921 This option allows you to set the size of the the
922 consistent memory pool. This pool of virtual memory
923 is used to make consistent memory allocations.
925 config CONSISTENT_SIZE
926 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
927 default "0x00200000" if NOT_COHERENT_CACHE
929 config BOOT_LOAD_BOOL
930 bool "Set the boot link/load address"
931 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
933 This option allows you to set the initial load address of the zImage
934 or zImage.initrd file. This can be useful if you are on a board
935 which has a small amount of memory.
937 Say N here unless you know what you are doing.
940 hex "Link/load address for booting" if BOOT_LOAD_BOOL
941 default "0x00400000" if 40x || 8xx || 8260
942 default "0x01000000" if 44x
946 bool "Pinned Kernel TLBs (860 ONLY)"
947 depends on ADVANCED_OPTIONS && 8xx
953 default "0xc000000000000000"
958 source "drivers/Kconfig"
962 # XXX source "arch/ppc/8xx_io/Kconfig"
964 # XXX source "arch/ppc/8260_io/Kconfig"
966 source "arch/powerpc/platforms/iseries/Kconfig"
970 menu "Instrumentation Support"
971 depends on EXPERIMENTAL
973 source "arch/powerpc/oprofile/Kconfig"
976 bool "Kprobes (EXPERIMENTAL)"
979 Kprobes allows you to trap at almost any kernel address and
980 execute a callback function. register_kprobe() establishes
981 a probepoint and specifies the callback. Kprobes is useful
982 for kernel debugging, non-intrusive instrumentation and testing.
983 If in doubt, say "N".
986 source "arch/powerpc/Kconfig.debug"
988 source "security/Kconfig"
992 depends on COMPAT && KEYS
995 source "crypto/Kconfig"