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 bool "kernel crash dumps (EXPERIMENTAL)"
384 depends on PPC_MULTIPLATFORM
385 depends on EXPERIMENTAL
387 Build a kernel suitable for use as a kdump capture kernel.
388 The kernel will be linked at a different address than normal, and
389 so can only be used for Kdump.
391 Don't change this unless you know what you are doing.
394 depends on PPC_PSERIES || PPC_ISERIES
399 depends on PPC_PSERIES
400 bool "Support for GX bus based adapters"
403 Bus device driver for GX bus based adapters.
409 config GENERIC_TBSYNC
411 default y if CONFIG_PPC32 && CONFIG_SMP
414 source "drivers/cpufreq/Kconfig"
417 bool "Support for Apple PowerBooks"
418 depends on CPU_FREQ && ADB_PMU && PPC32
419 select CPU_FREQ_TABLE
421 This adds support for frequency switching on Apple PowerBooks,
422 this currently includes some models of iBook & Titanium
425 config CPU_FREQ_PMAC64
426 bool "Support for some Apple G5s"
427 depends on CPU_FREQ && PMAC_SMU && PPC64
428 select CPU_FREQ_TABLE
430 This adds support for frequency switching on Apple iMac G5,
431 and some of the more recent desktop G5 machines as well.
433 config PPC601_SYNC_FIX
434 bool "Workarounds for PPC601 bugs"
435 depends on 6xx && (PPC_PREP || PPC_PMAC)
437 Some versions of the PPC601 (the first PowerPC chip) have bugs which
438 mean that extra synchronization instructions are required near
439 certain instructions, typically those that make major changes to the
440 CPU state. These extra instructions reduce performance slightly.
441 If you say N here, these extra instructions will not be included,
442 resulting in a kernel which will run faster but may not run at all
443 on some systems with the PPC601 chip.
445 If in doubt, say Y here.
448 bool "Thermal Management Support"
451 G3 and G4 processors have an on-chip temperature sensor called the
452 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
453 temperature within 2-4 degrees Celsius. This option shows the current
454 on-die temperature in /proc/cpuinfo if the cpu supports it.
456 Unfortunately, on some chip revisions, this sensor is very inaccurate
457 and in some cases, does not work at all, so don't assume the cpu
458 temp is actually what /proc/cpuinfo says it is.
461 bool "Interrupt driven TAU driver (DANGEROUS)"
464 The TAU supports an interrupt driven mode which causes an interrupt
465 whenever the temperature goes out of range. This is the fastest way
466 to get notified the temp has exceeded a range. With this option off,
467 a timer is used to re-check the temperature periodically.
469 However, on some cpus it appears that the TAU interrupt hardware
470 is buggy and can cause a situation which would lead unexplained hard
473 Unless you are extending the TAU driver, or enjoy kernel/hardware
474 debugging, leave this option off.
477 bool "Average high and low temp"
480 The TAU hardware can compare the temperature to an upper and lower
481 bound. The default behavior is to show both the upper and lower
482 bound in /proc/cpuinfo. If the range is large, the temperature is
483 either changing a lot, or the TAU hardware is broken (likely on some
484 G4's). If the range is small (around 4 degrees), the temperature is
485 relatively stable. If you say Y here, a single temperature value,
486 halfway between the upper and lower bounds, will be reported in
489 If in doubt, say N here.
492 source arch/powerpc/platforms/embedded6xx/Kconfig
493 source arch/powerpc/platforms/4xx/Kconfig
494 source arch/powerpc/platforms/85xx/Kconfig
495 source arch/powerpc/platforms/8xx/Kconfig
496 source arch/powerpc/platforms/cell/Kconfig
498 menu "Kernel options"
501 bool "High memory support"
504 source kernel/Kconfig.hz
505 source kernel/Kconfig.preempt
506 source "fs/Kconfig.binfmt"
508 # We optimistically allocate largepages from the VM, so make the limit
509 # large enough (16MB). This badly named config option is actually
511 config FORCE_MAX_ZONEORDER
514 default "9" if PPC_64K_PAGES
517 config MATH_EMULATION
518 bool "Math emulation"
519 depends on 4xx || 8xx || E200 || E500
521 Some PowerPC chips designed for embedded applications do not have
522 a floating-point unit and therefore do not implement the
523 floating-point instructions in the PowerPC instruction set. If you
524 say Y here, the kernel will include code to emulate a floating-point
525 unit, which will allow programs that use floating-point
529 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
530 depends on EXPERIMENTAL && PPC64
533 Cause IO segments sent to a device for DMA to be merged virtually
534 by the IOMMU when they happen to have been allocated contiguously.
535 This doesn't add pressure to the IOMMU allocator. However, some
536 drivers don't support getting large merged segments coming back
537 from *_map_sg(). Say Y if you know the drivers you are using are
538 properly handling this case.
541 bool "Support for enabling/disabling CPUs"
542 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
544 Say Y here to be able to disable and re-enable individual
545 CPUs at runtime on SMP machines.
547 Say N if you are unsure.
550 bool "kexec system call (EXPERIMENTAL)"
551 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
553 kexec is a system call that implements the ability to shutdown your
554 current kernel, and to start another kernel. It is like a reboot
555 but it is indepedent of the system firmware. And like a reboot
556 you can start any kernel with it, not just Linux.
558 The name comes from the similiarity to the exec system call.
560 It is an ongoing process to be certain the hardware in a machine
561 is properly shutdown, so do not be surprised if this code does not
562 initially work for you. It may help to enable device hotplugging
563 support. As of this writing the exact hardware interface is
564 strongly in flux, so no good recommendation can be made.
568 depends on 8xx || 8260
572 bool "PC PS/2 style Keyboard"
573 depends on 4xx || CPM2
576 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
577 default y if PPC_PREP
580 bool "Distribute interrupts on all CPUs by default"
581 depends on SMP && !MV64360
583 This option gives the kernel permission to distribute IRQs across
584 multiple CPUs. Saying N here will route all IRQs to the first
585 CPU. Generally saying Y is safe, although some problems have been
586 reported with SMP Power Macintoshes with this option enabled.
588 source "arch/powerpc/platforms/pseries/Kconfig"
593 default y if SMP && PPC_PSERIES
595 config ARCH_SELECT_MEMORY_MODEL
599 config ARCH_FLATMEM_ENABLE
601 depends on (PPC64 && !NUMA) || PPC32
603 config ARCH_SPARSEMEM_ENABLE
607 config ARCH_SPARSEMEM_DEFAULT
609 depends on SMP && PPC_PSERIES
613 config HAVE_ARCH_EARLY_PFN_TO_NID
615 depends on NEED_MULTIPLE_NODES
617 config ARCH_MEMORY_PROBE
619 depends on MEMORY_HOTPLUG
625 This option changes the kernel logical page size to 64k. On machines
626 without processor support for 64k pages, the kernel will simulate
627 them by loading each individual 4k page on demand transparently,
628 while on hardware with such support, it will be used to map
629 normal application pages.
632 bool "SMT (Hyperthreading) scheduler support"
633 depends on PPC64 && SMP
636 SMT scheduler support improves the CPU scheduler's decision making
637 when dealing with POWER5 cpus at a cost of slightly increased
638 overhead in some places. If unsure say N here.
640 config PROC_DEVICETREE
641 bool "Support for device tree in /proc"
644 This option adds a device-tree directory under /proc which contains
645 an image of the device tree that the kernel copies from Open
646 Firmware or other boot firmware. If unsure, say Y here.
648 source "arch/powerpc/platforms/prep/Kconfig"
651 bool "Default bootloader kernel arguments"
652 depends on !PPC_ISERIES
655 string "Initial kernel command string"
656 depends on CMDLINE_BOOL
657 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
659 On some platforms, there is currently no way for the boot loader to
660 pass arguments to the kernel. For these platforms, you can supply
661 some command-line options at build time by entering them here. In
662 most cases you will need to specify the root device here.
665 source kernel/power/Kconfig
669 bool "Enable seccomp to safely compute untrusted bytecode"
673 This kernel feature is useful for number crunching applications
674 that may need to compute untrusted bytecode during their
675 execution. By using pipes or other transports made available to
676 the process as file descriptors supporting the read/write
677 syscalls, it's possible to isolate those applications in
678 their own address space using seccomp. Once seccomp is
679 enabled via /proc/<pid>/seccomp, it cannot be disabled
680 and the task is only allowed to execute a few safe syscalls
681 defined by each seccomp mode.
683 If unsure, say Y. Only embedded should say N here.
694 bool "Support for ISA-bus hardware"
695 depends on PPC_PREP || PPC_CHRP
698 Find out whether you have ISA slots on your motherboard. ISA is the
699 name of a bus system, i.e. the way the CPU talks to the other stuff
700 inside your box. If you have an Apple machine, say N here; if you
701 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
702 you have an embedded board, consult your board documentation.
704 config GENERIC_ISA_DMA
706 depends on PPC64 || POWER4 || 6xx && !CPM2
714 config PPC_INDIRECT_PCI
717 default y if 40x || 44x || 85xx || 83xx
726 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
731 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
732 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
733 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
734 default PCI_QSPAN if !4xx && !CPM2 && 8xx
736 Find out whether your system includes a PCI bus. PCI is the name of
737 a bus system, i.e. the way the CPU talks to the other stuff inside
738 your box. If you say Y here, the kernel will include drivers and
739 infrastructure code to support PCI bus devices.
746 bool " Supprt for 2nd PCI host controller"
747 depends on PCI && MPC834x
748 default y if MPC834x_SYS
752 depends on !4xx && !CPM2 && 8xx
755 Say Y here if you have a system based on a Motorola 8xx-series
756 embedded processor with a QSPAN PCI interface, otherwise say N.
760 depends on PCI && 8260
761 select PPC_INDIRECT_PCI
765 bool " Enable workaround for MPC826x erratum PCI 9"
766 depends on PCI_8260 && !ADS8272
770 prompt " IDMA channel for PCI 9 workaround"
773 config 8260_PCI9_IDMA1
776 config 8260_PCI9_IDMA2
779 config 8260_PCI9_IDMA3
782 config 8260_PCI9_IDMA4
787 source "drivers/pci/Kconfig"
789 source "drivers/pcmcia/Kconfig"
791 source "drivers/pci/hotplug/Kconfig"
795 menu "Advanced setup"
798 config ADVANCED_OPTIONS
799 bool "Prompt for advanced kernel configuration options"
801 This option will enable prompting for a variety of advanced kernel
802 configuration options. These options can cause the kernel to not
803 work if they are set incorrectly, but can be used to optimize certain
804 aspects of kernel memory management.
806 Unless you know what you are doing, say N here.
808 comment "Default settings for advanced configuration options are used"
809 depends on !ADVANCED_OPTIONS
811 config HIGHMEM_START_BOOL
812 bool "Set high memory pool address"
813 depends on ADVANCED_OPTIONS && HIGHMEM
815 This option allows you to set the base address of the kernel virtual
816 area used to map high memory pages. This can be useful in
817 optimizing the layout of kernel virtual memory.
819 Say N here unless you know what you are doing.
822 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
825 config LOWMEM_SIZE_BOOL
826 bool "Set maximum low memory"
827 depends on ADVANCED_OPTIONS
829 This option allows you to set the maximum amount of memory which
830 will be used as "low memory", that is, memory which the kernel can
831 access directly, without having to set up a kernel virtual mapping.
832 This can be useful in optimizing the layout of kernel virtual
835 Say N here unless you know what you are doing.
838 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
841 config KERNEL_START_BOOL
842 bool "Set custom kernel base address"
843 depends on ADVANCED_OPTIONS
845 This option allows you to set the kernel virtual address at which
846 the kernel will map low memory (the kernel image will be linked at
847 this address). This can be useful in optimizing the virtual memory
848 layout of the system.
850 Say N here unless you know what you are doing.
853 hex "Virtual address of kernel base" if KERNEL_START_BOOL
856 config TASK_SIZE_BOOL
857 bool "Set custom user task size"
858 depends on ADVANCED_OPTIONS
860 This option allows you to set the amount of virtual address space
861 allocated to user tasks. This can be useful in optimizing the
862 virtual memory layout of the system.
864 Say N here unless you know what you are doing.
867 hex "Size of user task space" if TASK_SIZE_BOOL
870 config CONSISTENT_START_BOOL
871 bool "Set custom consistent memory pool address"
872 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
874 This option allows you to set the base virtual address
875 of the the consistent memory pool. This pool of virtual
876 memory is used to make consistent memory allocations.
878 config CONSISTENT_START
879 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
880 default "0xff100000" if NOT_COHERENT_CACHE
882 config CONSISTENT_SIZE_BOOL
883 bool "Set custom consistent memory pool size"
884 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
886 This option allows you to set the size of the the
887 consistent memory pool. This pool of virtual memory
888 is used to make consistent memory allocations.
890 config CONSISTENT_SIZE
891 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
892 default "0x00200000" if NOT_COHERENT_CACHE
894 config BOOT_LOAD_BOOL
895 bool "Set the boot link/load address"
896 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
898 This option allows you to set the initial load address of the zImage
899 or zImage.initrd file. This can be useful if you are on a board
900 which has a small amount of memory.
902 Say N here unless you know what you are doing.
905 hex "Link/load address for booting" if BOOT_LOAD_BOOL
906 default "0x00400000" if 40x || 8xx || 8260
907 default "0x01000000" if 44x
911 bool "Pinned Kernel TLBs (860 ONLY)"
912 depends on ADVANCED_OPTIONS && 8xx
918 default "0xc000000000000000"
923 source "drivers/Kconfig"
927 # XXX source "arch/ppc/8xx_io/Kconfig"
929 # XXX source "arch/ppc/8260_io/Kconfig"
931 source "arch/powerpc/platforms/iseries/Kconfig"
935 menu "Instrumentation Support"
936 depends on EXPERIMENTAL
938 source "arch/powerpc/oprofile/Kconfig"
941 bool "Kprobes (EXPERIMENTAL)"
944 Kprobes allows you to trap at almost any kernel address and
945 execute a callback function. register_kprobe() establishes
946 a probepoint and specifies the callback. Kprobes is useful
947 for kernel debugging, non-intrusive instrumentation and testing.
948 If in doubt, say "N".
951 source "arch/powerpc/Kconfig.debug"
953 source "security/Kconfig"
957 depends on COMPAT && KEYS
960 source "crypto/Kconfig"