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"
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
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
497 config MATH_EMULATION
498 bool "Math emulation"
499 depends on 4xx || 8xx || E200 || E500
501 Some PowerPC chips designed for embedded applications do not have
502 a floating-point unit and therefore do not implement the
503 floating-point instructions in the PowerPC instruction set. If you
504 say Y here, the kernel will include code to emulate a floating-point
505 unit, which will allow programs that use floating-point
509 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
510 depends on EXPERIMENTAL && PPC64
513 Cause IO segments sent to a device for DMA to be merged virtually
514 by the IOMMU when they happen to have been allocated contiguously.
515 This doesn't add pressure to the IOMMU allocator. However, some
516 drivers don't support getting large merged segments coming back
517 from *_map_sg(). Say Y if you know the drivers you are using are
518 properly handling this case.
521 bool "Support for enabling/disabling CPUs"
522 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
524 Say Y here to be able to disable and re-enable individual
525 CPUs at runtime on SMP machines.
527 Say N if you are unsure.
530 bool "kexec system call (EXPERIMENTAL)"
531 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
533 kexec is a system call that implements the ability to shutdown your
534 current kernel, and to start another kernel. It is like a reboot
535 but it is indepedent of the system firmware. And like a reboot
536 you can start any kernel with it, not just Linux.
538 The name comes from the similiarity to the exec system call.
540 It is an ongoing process to be certain the hardware in a machine
541 is properly shutdown, so do not be surprised if this code does not
542 initially work for you. It may help to enable device hotplugging
543 support. As of this writing the exact hardware interface is
544 strongly in flux, so no good recommendation can be made.
548 depends on 8xx || 8260
552 bool "PC PS/2 style Keyboard"
553 depends on 4xx || CPM2
556 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
557 default y if PPC_PREP
560 bool "Distribute interrupts on all CPUs by default"
561 depends on SMP && !MV64360
563 This option gives the kernel permission to distribute IRQs across
564 multiple CPUs. Saying N here will route all IRQs to the first
565 CPU. Generally saying Y is safe, although some problems have been
566 reported with SMP Power Macintoshes with this option enabled.
568 source "arch/powerpc/platforms/pseries/Kconfig"
573 default y if SMP && PPC_PSERIES
575 config ARCH_SELECT_MEMORY_MODEL
579 config ARCH_FLATMEM_ENABLE
581 depends on PPC64 && !NUMA
583 config ARCH_DISCONTIGMEM_ENABLE
585 depends on SMP && PPC_PSERIES
587 config ARCH_DISCONTIGMEM_DEFAULT
589 depends on ARCH_DISCONTIGMEM_ENABLE
591 config ARCH_SPARSEMEM_ENABLE
593 depends on ARCH_DISCONTIGMEM_ENABLE
597 config HAVE_ARCH_EARLY_PFN_TO_NID
599 depends on NEED_MULTIPLE_NODES
601 # Some NUMA nodes have memory ranges that span
602 # other nodes. Even though a pfn is valid and
603 # between a node's start and end pfns, it may not
604 # reside on that node.
606 # This is a relatively temporary hack that should
607 # be able to go away when sparsemem is fully in
610 config NODES_SPAN_OTHER_NODES
612 depends on NEED_MULTIPLE_NODES
618 This option changes the kernel logical page size to 64k. On machines
619 without processor support for 64k pages, the kernel will simulate
620 them by loading each individual 4k page on demand transparently,
621 while on hardware with such support, it will be used to map
622 normal application pages.
625 bool "SMT (Hyperthreading) scheduler support"
626 depends on PPC64 && SMP
629 SMT scheduler support improves the CPU scheduler's decision making
630 when dealing with POWER5 cpus at a cost of slightly increased
631 overhead in some places. If unsure say N here.
633 config PROC_DEVICETREE
634 bool "Support for device tree in /proc"
637 This option adds a device-tree directory under /proc which contains
638 an image of the device tree that the kernel copies from Open
639 Firmware or other boot firmware. If unsure, say Y here.
641 source "arch/powerpc/platforms/prep/Kconfig"
644 bool "Default bootloader kernel arguments"
645 depends on !PPC_ISERIES
648 string "Initial kernel command string"
649 depends on CMDLINE_BOOL
650 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
652 On some platforms, there is currently no way for the boot loader to
653 pass arguments to the kernel. For these platforms, you can supply
654 some command-line options at build time by entering them here. In
655 most cases you will need to specify the root device here.
658 source kernel/power/Kconfig
662 bool "Enable seccomp to safely compute untrusted bytecode"
666 This kernel feature is useful for number crunching applications
667 that may need to compute untrusted bytecode during their
668 execution. By using pipes or other transports made available to
669 the process as file descriptors supporting the read/write
670 syscalls, it's possible to isolate those applications in
671 their own address space using seccomp. Once seccomp is
672 enabled via /proc/<pid>/seccomp, it cannot be disabled
673 and the task is only allowed to execute a few safe syscalls
674 defined by each seccomp mode.
676 If unsure, say Y. Only embedded should say N here.
687 bool "Support for ISA-bus hardware"
688 depends on PPC_PREP || PPC_CHRP
691 Find out whether you have ISA slots on your motherboard. ISA is the
692 name of a bus system, i.e. the way the CPU talks to the other stuff
693 inside your box. If you have an Apple machine, say N here; if you
694 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
695 you have an embedded board, consult your board documentation.
697 config GENERIC_ISA_DMA
699 depends on PPC64 || POWER4 || 6xx && !CPM2
707 config PPC_INDIRECT_PCI
710 default y if 40x || 44x || 85xx || 83xx
719 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
724 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
725 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
726 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
727 default PCI_QSPAN if !4xx && !CPM2 && 8xx
729 Find out whether your system includes a PCI bus. PCI is the name of
730 a bus system, i.e. the way the CPU talks to the other stuff inside
731 your box. If you say Y here, the kernel will include drivers and
732 infrastructure code to support PCI bus devices.
739 bool " Supprt for 2nd PCI host controller"
740 depends on PCI && MPC834x
741 default y if MPC834x_SYS
745 depends on !4xx && !CPM2 && 8xx
748 Say Y here if you have a system based on a Motorola 8xx-series
749 embedded processor with a QSPAN PCI interface, otherwise say N.
753 depends on PCI && 8260
754 select PPC_INDIRECT_PCI
758 bool " Enable workaround for MPC826x erratum PCI 9"
759 depends on PCI_8260 && !ADS8272
763 prompt " IDMA channel for PCI 9 workaround"
766 config 8260_PCI9_IDMA1
769 config 8260_PCI9_IDMA2
772 config 8260_PCI9_IDMA3
775 config 8260_PCI9_IDMA4
780 source "drivers/pci/Kconfig"
782 source "drivers/pcmcia/Kconfig"
784 source "drivers/pci/hotplug/Kconfig"
788 menu "Advanced setup"
791 config ADVANCED_OPTIONS
792 bool "Prompt for advanced kernel configuration options"
794 This option will enable prompting for a variety of advanced kernel
795 configuration options. These options can cause the kernel to not
796 work if they are set incorrectly, but can be used to optimize certain
797 aspects of kernel memory management.
799 Unless you know what you are doing, say N here.
801 comment "Default settings for advanced configuration options are used"
802 depends on !ADVANCED_OPTIONS
804 config HIGHMEM_START_BOOL
805 bool "Set high memory pool address"
806 depends on ADVANCED_OPTIONS && HIGHMEM
808 This option allows you to set the base address of the kernel virtual
809 area used to map high memory pages. This can be useful in
810 optimizing the layout of kernel virtual memory.
812 Say N here unless you know what you are doing.
815 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
818 config LOWMEM_SIZE_BOOL
819 bool "Set maximum low memory"
820 depends on ADVANCED_OPTIONS
822 This option allows you to set the maximum amount of memory which
823 will be used as "low memory", that is, memory which the kernel can
824 access directly, without having to set up a kernel virtual mapping.
825 This can be useful in optimizing the layout of kernel virtual
828 Say N here unless you know what you are doing.
831 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
834 config KERNEL_START_BOOL
835 bool "Set custom kernel base address"
836 depends on ADVANCED_OPTIONS
838 This option allows you to set the kernel virtual address at which
839 the kernel will map low memory (the kernel image will be linked at
840 this address). This can be useful in optimizing the virtual memory
841 layout of the system.
843 Say N here unless you know what you are doing.
846 hex "Virtual address of kernel base" if KERNEL_START_BOOL
849 config TASK_SIZE_BOOL
850 bool "Set custom user task size"
851 depends on ADVANCED_OPTIONS
853 This option allows you to set the amount of virtual address space
854 allocated to user tasks. This can be useful in optimizing the
855 virtual memory layout of the system.
857 Say N here unless you know what you are doing.
860 hex "Size of user task space" if TASK_SIZE_BOOL
863 config CONSISTENT_START_BOOL
864 bool "Set custom consistent memory pool address"
865 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
867 This option allows you to set the base virtual address
868 of the the consistent memory pool. This pool of virtual
869 memory is used to make consistent memory allocations.
871 config CONSISTENT_START
872 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
873 default "0xff100000" if NOT_COHERENT_CACHE
875 config CONSISTENT_SIZE_BOOL
876 bool "Set custom consistent memory pool size"
877 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
879 This option allows you to set the size of the the
880 consistent memory pool. This pool of virtual memory
881 is used to make consistent memory allocations.
883 config CONSISTENT_SIZE
884 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
885 default "0x00200000" if NOT_COHERENT_CACHE
887 config BOOT_LOAD_BOOL
888 bool "Set the boot link/load address"
889 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
891 This option allows you to set the initial load address of the zImage
892 or zImage.initrd file. This can be useful if you are on a board
893 which has a small amount of memory.
895 Say N here unless you know what you are doing.
898 hex "Link/load address for booting" if BOOT_LOAD_BOOL
899 default "0x00400000" if 40x || 8xx || 8260
900 default "0x01000000" if 44x
904 bool "Pinned Kernel TLBs (860 ONLY)"
905 depends on ADVANCED_OPTIONS && 8xx
911 default "0xc000000000000000"
916 source "drivers/Kconfig"
920 # XXX source "arch/ppc/8xx_io/Kconfig"
922 # XXX source "arch/ppc/8260_io/Kconfig"
924 source "arch/powerpc/platforms/iseries/Kconfig"
928 menu "Instrumentation Support"
929 depends on EXPERIMENTAL
931 source "arch/powerpc/oprofile/Kconfig"
934 bool "Kprobes (EXPERIMENTAL)"
936 Kprobes allows you to trap at almost any kernel address and
937 execute a callback function. register_kprobe() establishes
938 a probepoint and specifies the callback. Kprobes is useful
939 for kernel debugging, non-intrusive instrumentation and testing.
940 If in doubt, say "N".
943 source "arch/powerpc/Kconfig.debug"
945 source "security/Kconfig"
949 depends on COMPAT && KEYS
952 source "crypto/Kconfig"