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"
282 bool " Common Hardware Reference Platform (CHRP) based machines"
283 depends on PPC_MULTIPLATFORM && PPC32
285 select PPC_INDIRECT_PCI
289 bool " Apple PowerMac based machines"
290 depends on PPC_MULTIPLATFORM
291 select PPC_INDIRECT_PCI if PPC32
296 depends on PPC_PMAC && POWER4
301 bool " PowerPC Reference Platform (PReP) based machines"
302 depends on PPC_MULTIPLATFORM && PPC32
304 select PPC_INDIRECT_PCI
308 depends on PPC_MULTIPLATFORM && PPC64
309 bool " Maple 970FX Evaluation Board"
311 select MPIC_BROKEN_U3
314 This option enables support for the Maple 970FX Evaluation Board.
315 For more informations, refer to <http://www.970eval.com>
318 bool " Broadband Processor Architecture"
319 depends on PPC_MULTIPLATFORM && PPC64
323 depends on PPC_MULTIPLATFORM # for now
327 depends on PPC_PSERIES
333 depends on PPC_MULTIPLATFORM && PPC64
337 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
341 config MPIC_BROKEN_U3
352 depends on PPC_PSERIES || PPC_ISERIES
356 source "drivers/cpufreq/Kconfig"
359 bool "Support for Apple PowerBooks"
360 depends on CPU_FREQ && ADB_PMU && PPC32
361 select CPU_FREQ_TABLE
363 This adds support for frequency switching on Apple PowerBooks,
364 this currently includes some models of iBook & Titanium
367 config PPC601_SYNC_FIX
368 bool "Workarounds for PPC601 bugs"
369 depends on 6xx && (PPC_PREP || PPC_PMAC)
371 Some versions of the PPC601 (the first PowerPC chip) have bugs which
372 mean that extra synchronization instructions are required near
373 certain instructions, typically those that make major changes to the
374 CPU state. These extra instructions reduce performance slightly.
375 If you say N here, these extra instructions will not be included,
376 resulting in a kernel which will run faster but may not run at all
377 on some systems with the PPC601 chip.
379 If in doubt, say Y here.
382 bool "Thermal Management Support"
385 G3 and G4 processors have an on-chip temperature sensor called the
386 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
387 temperature within 2-4 degrees Celsius. This option shows the current
388 on-die temperature in /proc/cpuinfo if the cpu supports it.
390 Unfortunately, on some chip revisions, this sensor is very inaccurate
391 and in some cases, does not work at all, so don't assume the cpu
392 temp is actually what /proc/cpuinfo says it is.
395 bool "Interrupt driven TAU driver (DANGEROUS)"
398 The TAU supports an interrupt driven mode which causes an interrupt
399 whenever the temperature goes out of range. This is the fastest way
400 to get notified the temp has exceeded a range. With this option off,
401 a timer is used to re-check the temperature periodically.
403 However, on some cpus it appears that the TAU interrupt hardware
404 is buggy and can cause a situation which would lead unexplained hard
407 Unless you are extending the TAU driver, or enjoy kernel/hardware
408 debugging, leave this option off.
411 bool "Average high and low temp"
414 The TAU hardware can compare the temperature to an upper and lower
415 bound. The default behavior is to show both the upper and lower
416 bound in /proc/cpuinfo. If the range is large, the temperature is
417 either changing a lot, or the TAU hardware is broken (likely on some
418 G4's). If the range is small (around 4 degrees), the temperature is
419 relatively stable. If you say Y here, a single temperature value,
420 halfway between the upper and lower bounds, will be reported in
423 If in doubt, say N here.
426 source arch/powerpc/platforms/embedded6xx/Kconfig
427 source arch/powerpc/platforms/4xx/Kconfig
428 source arch/powerpc/platforms/85xx/Kconfig
429 source arch/powerpc/platforms/8xx/Kconfig
431 menu "Kernel options"
434 bool "High memory support"
437 source kernel/Kconfig.hz
438 source kernel/Kconfig.preempt
439 source "fs/Kconfig.binfmt"
441 # We optimistically allocate largepages from the VM, so make the limit
442 # large enough (16MB). This badly named config option is actually
444 config FORCE_MAX_ZONEORDER
449 config MATH_EMULATION
450 bool "Math emulation"
451 depends on 4xx || 8xx || E200 || E500
453 Some PowerPC chips designed for embedded applications do not have
454 a floating-point unit and therefore do not implement the
455 floating-point instructions in the PowerPC instruction set. If you
456 say Y here, the kernel will include code to emulate a floating-point
457 unit, which will allow programs that use floating-point
461 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
462 depends on EXPERIMENTAL && PPC64
465 Cause IO segments sent to a device for DMA to be merged virtually
466 by the IOMMU when they happen to have been allocated contiguously.
467 This doesn't add pressure to the IOMMU allocator. However, some
468 drivers don't support getting large merged segments coming back
469 from *_map_sg(). Say Y if you know the drivers you are using are
470 properly handling this case.
473 bool "Support for enabling/disabling CPUs"
474 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
476 Say Y here to be able to disable and re-enable individual
477 CPUs at runtime on SMP machines.
479 Say N if you are unsure.
482 bool "kexec system call (EXPERIMENTAL)"
483 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
485 kexec is a system call that implements the ability to shutdown your
486 current kernel, and to start another kernel. It is like a reboot
487 but it is indepedent of the system firmware. And like a reboot
488 you can start any kernel with it, not just Linux.
490 The name comes from the similiarity to the exec system call.
492 It is an ongoing process to be certain the hardware in a machine
493 is properly shutdown, so do not be surprised if this code does not
494 initially work for you. It may help to enable device hotplugging
495 support. As of this writing the exact hardware interface is
496 strongly in flux, so no good recommendation can be made.
500 depends on 8xx || 8260
504 bool "PC PS/2 style Keyboard"
505 depends on 4xx || CPM2
508 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
509 default y if PPC_PREP
512 bool "Distribute interrupts on all CPUs by default"
513 depends on SMP && !MV64360
515 This option gives the kernel permission to distribute IRQs across
516 multiple CPUs. Saying N here will route all IRQs to the first
517 CPU. Generally saying Y is safe, although some problems have been
518 reported with SMP Power Macintoshes with this option enabled.
520 source "arch/powerpc/platforms/pseries/Kconfig"
522 config ARCH_SELECT_MEMORY_MODEL
526 config ARCH_FLATMEM_ENABLE
528 depends on PPC64 && !NUMA
530 config ARCH_DISCONTIGMEM_ENABLE
532 depends on SMP && PPC_PSERIES
534 config ARCH_DISCONTIGMEM_DEFAULT
536 depends on ARCH_DISCONTIGMEM_ENABLE
538 config ARCH_FLATMEM_ENABLE
542 config ARCH_SPARSEMEM_ENABLE
544 depends on ARCH_DISCONTIGMEM_ENABLE
548 config HAVE_ARCH_EARLY_PFN_TO_NID
550 depends on NEED_MULTIPLE_NODES
552 # Some NUMA nodes have memory ranges that span
553 # other nodes. Even though a pfn is valid and
554 # between a node's start and end pfns, it may not
555 # reside on that node.
557 # This is a relatively temporary hack that should
558 # be able to go away when sparsemem is fully in
561 config NODES_SPAN_OTHER_NODES
563 depends on NEED_MULTIPLE_NODES
567 default y if DISCONTIGMEM || SPARSEMEM
570 bool "SMT (Hyperthreading) scheduler support"
571 depends on PPC64 && SMP
574 SMT scheduler support improves the CPU scheduler's decision making
575 when dealing with POWER5 cpus at a cost of slightly increased
576 overhead in some places. If unsure say N here.
578 config PROC_DEVICETREE
579 bool "Support for device tree in /proc"
582 This option adds a device-tree directory under /proc which contains
583 an image of the device tree that the kernel copies from Open
584 Firmware or other boot firmware. If unsure, say Y here.
586 source "arch/powerpc/platforms/prep/Kconfig"
589 bool "Default bootloader kernel arguments"
590 depends on !PPC_ISERIES
593 string "Initial kernel command string"
594 depends on CMDLINE_BOOL
595 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
597 On some platforms, there is currently no way for the boot loader to
598 pass arguments to the kernel. For these platforms, you can supply
599 some command-line options at build time by entering them here. In
600 most cases you will need to specify the root device here.
603 source kernel/power/Kconfig
607 bool "Enable seccomp to safely compute untrusted bytecode"
611 This kernel feature is useful for number crunching applications
612 that may need to compute untrusted bytecode during their
613 execution. By using pipes or other transports made available to
614 the process as file descriptors supporting the read/write
615 syscalls, it's possible to isolate those applications in
616 their own address space using seccomp. Once seccomp is
617 enabled via /proc/<pid>/seccomp, it cannot be disabled
618 and the task is only allowed to execute a few safe syscalls
619 defined by each seccomp mode.
621 If unsure, say Y. Only embedded should say N here.
632 bool "Support for ISA-bus hardware"
633 depends on PPC_PREP || PPC_CHRP
636 Find out whether you have ISA slots on your motherboard. ISA is the
637 name of a bus system, i.e. the way the CPU talks to the other stuff
638 inside your box. If you have an Apple machine, say N here; if you
639 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
640 you have an embedded board, consult your board documentation.
642 config GENERIC_ISA_DMA
644 depends on PPC64 || POWER4 || 6xx && !CPM2
652 config PPC_INDIRECT_PCI
655 default y if 40x || 44x || 85xx || 83xx
664 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
669 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
670 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
671 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
672 default PCI_QSPAN if !4xx && !CPM2 && 8xx
674 Find out whether your system includes a PCI bus. PCI is the name of
675 a bus system, i.e. the way the CPU talks to the other stuff inside
676 your box. If you say Y here, the kernel will include drivers and
677 infrastructure code to support PCI bus devices.
684 bool " Supprt for 2nd PCI host controller"
685 depends on PCI && MPC834x
686 default y if MPC834x_SYS
690 depends on !4xx && !CPM2 && 8xx
693 Say Y here if you have a system based on a Motorola 8xx-series
694 embedded processor with a QSPAN PCI interface, otherwise say N.
698 depends on PCI && 8260
699 select PPC_INDIRECT_PCI
703 bool " Enable workaround for MPC826x erratum PCI 9"
704 depends on PCI_8260 && !ADS8272
708 prompt " IDMA channel for PCI 9 workaround"
711 config 8260_PCI9_IDMA1
714 config 8260_PCI9_IDMA2
717 config 8260_PCI9_IDMA3
720 config 8260_PCI9_IDMA4
725 source "drivers/pci/Kconfig"
727 source "drivers/pcmcia/Kconfig"
729 source "drivers/pci/hotplug/Kconfig"
733 menu "Advanced setup"
736 config ADVANCED_OPTIONS
737 bool "Prompt for advanced kernel configuration options"
739 This option will enable prompting for a variety of advanced kernel
740 configuration options. These options can cause the kernel to not
741 work if they are set incorrectly, but can be used to optimize certain
742 aspects of kernel memory management.
744 Unless you know what you are doing, say N here.
746 comment "Default settings for advanced configuration options are used"
747 depends on !ADVANCED_OPTIONS
749 config HIGHMEM_START_BOOL
750 bool "Set high memory pool address"
751 depends on ADVANCED_OPTIONS && HIGHMEM
753 This option allows you to set the base address of the kernel virtual
754 area used to map high memory pages. This can be useful in
755 optimizing the layout of kernel virtual memory.
757 Say N here unless you know what you are doing.
760 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
763 config LOWMEM_SIZE_BOOL
764 bool "Set maximum low memory"
765 depends on ADVANCED_OPTIONS
767 This option allows you to set the maximum amount of memory which
768 will be used as "low memory", that is, memory which the kernel can
769 access directly, without having to set up a kernel virtual mapping.
770 This can be useful in optimizing the layout of kernel virtual
773 Say N here unless you know what you are doing.
776 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
779 config KERNEL_START_BOOL
780 bool "Set custom kernel base address"
781 depends on ADVANCED_OPTIONS
783 This option allows you to set the kernel virtual address at which
784 the kernel will map low memory (the kernel image will be linked at
785 this address). This can be useful in optimizing the virtual memory
786 layout of the system.
788 Say N here unless you know what you are doing.
791 hex "Virtual address of kernel base" if KERNEL_START_BOOL
794 config TASK_SIZE_BOOL
795 bool "Set custom user task size"
796 depends on ADVANCED_OPTIONS
798 This option allows you to set the amount of virtual address space
799 allocated to user tasks. This can be useful in optimizing the
800 virtual memory layout of the system.
802 Say N here unless you know what you are doing.
805 hex "Size of user task space" if TASK_SIZE_BOOL
808 config CONSISTENT_START_BOOL
809 bool "Set custom consistent memory pool address"
810 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
812 This option allows you to set the base virtual address
813 of the the consistent memory pool. This pool of virtual
814 memory is used to make consistent memory allocations.
816 config CONSISTENT_START
817 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
818 default "0xff100000" if NOT_COHERENT_CACHE
820 config CONSISTENT_SIZE_BOOL
821 bool "Set custom consistent memory pool size"
822 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
824 This option allows you to set the size of the the
825 consistent memory pool. This pool of virtual memory
826 is used to make consistent memory allocations.
828 config CONSISTENT_SIZE
829 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
830 default "0x00200000" if NOT_COHERENT_CACHE
832 config BOOT_LOAD_BOOL
833 bool "Set the boot link/load address"
834 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
836 This option allows you to set the initial load address of the zImage
837 or zImage.initrd file. This can be useful if you are on a board
838 which has a small amount of memory.
840 Say N here unless you know what you are doing.
843 hex "Link/load address for booting" if BOOT_LOAD_BOOL
844 default "0x00400000" if 40x || 8xx || 8260
845 default "0x01000000" if 44x
849 bool "Pinned Kernel TLBs (860 ONLY)"
850 depends on ADVANCED_OPTIONS && 8xx
856 default "0xc000000000000000"
861 source "drivers/Kconfig"
865 # XXX source "arch/ppc/8xx_io/Kconfig"
867 # XXX source "arch/ppc/8260_io/Kconfig"
869 source "arch/powerpc/platforms/iseries/Kconfig"
873 source "arch/powerpc/oprofile/Kconfig"
875 source "arch/powerpc/Kconfig.debug"
877 source "security/Kconfig"
881 depends on COMPAT && KEYS
884 source "crypto/Kconfig"