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"
281 bool " Common Hardware Reference Platform (CHRP) based machines"
282 depends on PPC_MULTIPLATFORM && PPC32
283 select PPC_INDIRECT_PCI
287 bool " Apple PowerMac based machines"
288 depends on PPC_MULTIPLATFORM
289 select PPC_INDIRECT_PCI if PPC32
294 depends on PPC_PMAC && POWER4
299 bool " PowerPC Reference Platform (PReP) based machines"
300 depends on PPC_MULTIPLATFORM && PPC32
301 select PPC_INDIRECT_PCI
305 depends on PPC_MULTIPLATFORM && PPC64
306 bool " Maple 970FX Evaluation Board"
308 select MPIC_BROKEN_U3
311 This option enables support for the Maple 970FX Evaluation Board.
312 For more informations, refer to <http://www.970eval.com>
315 bool " Broadband Processor Architecture"
316 depends on PPC_MULTIPLATFORM && PPC64
320 depends on PPC_MULTIPLATFORM # for now
324 depends on PPC_PSERIES
330 depends on PPC_MULTIPLATFORM && PPC64
334 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
338 config MPIC_BROKEN_U3
349 depends on PPC_PSERIES || PPC_ISERIES
353 source "drivers/cpufreq/Kconfig"
356 bool "Support for Apple PowerBooks"
357 depends on CPU_FREQ && ADB_PMU && PPC32
358 select CPU_FREQ_TABLE
360 This adds support for frequency switching on Apple PowerBooks,
361 this currently includes some models of iBook & Titanium
364 config PPC601_SYNC_FIX
365 bool "Workarounds for PPC601 bugs"
366 depends on 6xx && (PPC_PREP || PPC_PMAC)
368 Some versions of the PPC601 (the first PowerPC chip) have bugs which
369 mean that extra synchronization instructions are required near
370 certain instructions, typically those that make major changes to the
371 CPU state. These extra instructions reduce performance slightly.
372 If you say N here, these extra instructions will not be included,
373 resulting in a kernel which will run faster but may not run at all
374 on some systems with the PPC601 chip.
376 If in doubt, say Y here.
379 bool "Thermal Management Support"
382 G3 and G4 processors have an on-chip temperature sensor called the
383 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
384 temperature within 2-4 degrees Celsius. This option shows the current
385 on-die temperature in /proc/cpuinfo if the cpu supports it.
387 Unfortunately, on some chip revisions, this sensor is very inaccurate
388 and in some cases, does not work at all, so don't assume the cpu
389 temp is actually what /proc/cpuinfo says it is.
392 bool "Interrupt driven TAU driver (DANGEROUS)"
395 The TAU supports an interrupt driven mode which causes an interrupt
396 whenever the temperature goes out of range. This is the fastest way
397 to get notified the temp has exceeded a range. With this option off,
398 a timer is used to re-check the temperature periodically.
400 However, on some cpus it appears that the TAU interrupt hardware
401 is buggy and can cause a situation which would lead unexplained hard
404 Unless you are extending the TAU driver, or enjoy kernel/hardware
405 debugging, leave this option off.
408 bool "Average high and low temp"
411 The TAU hardware can compare the temperature to an upper and lower
412 bound. The default behavior is to show both the upper and lower
413 bound in /proc/cpuinfo. If the range is large, the temperature is
414 either changing a lot, or the TAU hardware is broken (likely on some
415 G4's). If the range is small (around 4 degrees), the temperature is
416 relatively stable. If you say Y here, a single temperature value,
417 halfway between the upper and lower bounds, will be reported in
420 If in doubt, say N here.
423 source arch/powerpc/platforms/embedded6xx/Kconfig
424 source arch/powerpc/platforms/4xx/Kconfig
425 source arch/powerpc/platforms/85xx/Kconfig
426 source arch/powerpc/platforms/8xx/Kconfig
428 menu "Kernel options"
431 bool "High memory support"
434 source kernel/Kconfig.hz
435 source kernel/Kconfig.preempt
436 source "fs/Kconfig.binfmt"
438 # We optimistically allocate largepages from the VM, so make the limit
439 # large enough (16MB). This badly named config option is actually
441 config FORCE_MAX_ZONEORDER
446 config MATH_EMULATION
447 bool "Math emulation"
448 depends on 4xx || 8xx || E200 || E500
450 Some PowerPC chips designed for embedded applications do not have
451 a floating-point unit and therefore do not implement the
452 floating-point instructions in the PowerPC instruction set. If you
453 say Y here, the kernel will include code to emulate a floating-point
454 unit, which will allow programs that use floating-point
458 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
459 depends on EXPERIMENTAL && PPC64
462 Cause IO segments sent to a device for DMA to be merged virtually
463 by the IOMMU when they happen to have been allocated contiguously.
464 This doesn't add pressure to the IOMMU allocator. However, some
465 drivers don't support getting large merged segments coming back
466 from *_map_sg(). Say Y if you know the drivers you are using are
467 properly handling this case.
470 bool "Support for enabling/disabling CPUs"
471 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
473 Say Y here to be able to disable and re-enable individual
474 CPUs at runtime on SMP machines.
476 Say N if you are unsure.
479 bool "kexec system call (EXPERIMENTAL)"
480 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
482 kexec is a system call that implements the ability to shutdown your
483 current kernel, and to start another kernel. It is like a reboot
484 but it is indepedent of the system firmware. And like a reboot
485 you can start any kernel with it, not just Linux.
487 The name comes from the similiarity to the exec system call.
489 It is an ongoing process to be certain the hardware in a machine
490 is properly shutdown, so do not be surprised if this code does not
491 initially work for you. It may help to enable device hotplugging
492 support. As of this writing the exact hardware interface is
493 strongly in flux, so no good recommendation can be made.
497 depends on 8xx || 8260
501 bool "PC PS/2 style Keyboard"
502 depends on 4xx || CPM2
505 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
506 default y if PPC_PREP
509 bool "Distribute interrupts on all CPUs by default"
510 depends on SMP && !MV64360
512 This option gives the kernel permission to distribute IRQs across
513 multiple CPUs. Saying N here will route all IRQs to the first
514 CPU. Generally saying Y is safe, although some problems have been
515 reported with SMP Power Macintoshes with this option enabled.
517 source "arch/powerpc/platforms/pseries/Kconfig"
519 config ARCH_SELECT_MEMORY_MODEL
523 config ARCH_FLATMEM_ENABLE
525 depends on PPC64 && !NUMA
527 config ARCH_DISCONTIGMEM_ENABLE
529 depends on SMP && PPC_PSERIES
531 config ARCH_DISCONTIGMEM_DEFAULT
533 depends on ARCH_DISCONTIGMEM_ENABLE
535 config ARCH_FLATMEM_ENABLE
539 config ARCH_SPARSEMEM_ENABLE
541 depends on ARCH_DISCONTIGMEM_ENABLE
545 config HAVE_ARCH_EARLY_PFN_TO_NID
547 depends on NEED_MULTIPLE_NODES
549 # Some NUMA nodes have memory ranges that span
550 # other nodes. Even though a pfn is valid and
551 # between a node's start and end pfns, it may not
552 # reside on that node.
554 # This is a relatively temporary hack that should
555 # be able to go away when sparsemem is fully in
558 config NODES_SPAN_OTHER_NODES
560 depends on NEED_MULTIPLE_NODES
564 default y if DISCONTIGMEM || SPARSEMEM
567 bool "SMT (Hyperthreading) scheduler support"
568 depends on PPC64 && SMP
571 SMT scheduler support improves the CPU scheduler's decision making
572 when dealing with POWER5 cpus at a cost of slightly increased
573 overhead in some places. If unsure say N here.
575 config PROC_DEVICETREE
576 bool "Support for device tree in /proc"
579 This option adds a device-tree directory under /proc which contains
580 an image of the device tree that the kernel copies from Open
581 Firmware or other boot firmware. If unsure, say Y here.
583 source "arch/powerpc/platforms/prep/Kconfig"
586 bool "Default bootloader kernel arguments"
587 depends on !PPC_ISERIES
590 string "Initial kernel command string"
591 depends on CMDLINE_BOOL
592 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
594 On some platforms, there is currently no way for the boot loader to
595 pass arguments to the kernel. For these platforms, you can supply
596 some command-line options at build time by entering them here. In
597 most cases you will need to specify the root device here.
600 source kernel/power/Kconfig
604 bool "Enable seccomp to safely compute untrusted bytecode"
608 This kernel feature is useful for number crunching applications
609 that may need to compute untrusted bytecode during their
610 execution. By using pipes or other transports made available to
611 the process as file descriptors supporting the read/write
612 syscalls, it's possible to isolate those applications in
613 their own address space using seccomp. Once seccomp is
614 enabled via /proc/<pid>/seccomp, it cannot be disabled
615 and the task is only allowed to execute a few safe syscalls
616 defined by each seccomp mode.
618 If unsure, say Y. Only embedded should say N here.
629 bool "Support for ISA-bus hardware"
630 depends on PPC_PREP || PPC_CHRP
632 Find out whether you have ISA slots on your motherboard. ISA is the
633 name of a bus system, i.e. the way the CPU talks to the other stuff
634 inside your box. If you have an Apple machine, say N here; if you
635 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
636 you have an embedded board, consult your board documentation.
638 config GENERIC_ISA_DMA
640 depends on PPC64 || POWER4 || 6xx && !CPM2
643 config PPC_INDIRECT_PCI
646 default y if 40x || 44x || 85xx || 83xx
655 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
660 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
661 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
662 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
663 default PCI_QSPAN if !4xx && !CPM2 && 8xx
665 Find out whether your system includes a PCI bus. PCI is the name of
666 a bus system, i.e. the way the CPU talks to the other stuff inside
667 your box. If you say Y here, the kernel will include drivers and
668 infrastructure code to support PCI bus devices.
675 bool " Supprt for 2nd PCI host controller"
676 depends on PCI && MPC834x
677 default y if MPC834x_SYS
681 depends on !4xx && !CPM2 && 8xx
683 Say Y here if you have a system based on a Motorola 8xx-series
684 embedded processor with a QSPAN PCI interface, otherwise say N.
688 depends on PCI && 8260
689 select PPC_INDIRECT_PCI
693 bool " Enable workaround for MPC826x erratum PCI 9"
694 depends on PCI_8260 && !ADS8272
698 prompt " IDMA channel for PCI 9 workaround"
701 config 8260_PCI9_IDMA1
704 config 8260_PCI9_IDMA2
707 config 8260_PCI9_IDMA3
710 config 8260_PCI9_IDMA4
715 source "drivers/pci/Kconfig"
717 source "drivers/pcmcia/Kconfig"
719 source "drivers/pci/hotplug/Kconfig"
723 menu "Advanced setup"
726 config ADVANCED_OPTIONS
727 bool "Prompt for advanced kernel configuration options"
729 This option will enable prompting for a variety of advanced kernel
730 configuration options. These options can cause the kernel to not
731 work if they are set incorrectly, but can be used to optimize certain
732 aspects of kernel memory management.
734 Unless you know what you are doing, say N here.
736 comment "Default settings for advanced configuration options are used"
737 depends on !ADVANCED_OPTIONS
739 config HIGHMEM_START_BOOL
740 bool "Set high memory pool address"
741 depends on ADVANCED_OPTIONS && HIGHMEM
743 This option allows you to set the base address of the kernel virtual
744 area used to map high memory pages. This can be useful in
745 optimizing the layout of kernel virtual memory.
747 Say N here unless you know what you are doing.
750 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
753 config LOWMEM_SIZE_BOOL
754 bool "Set maximum low memory"
755 depends on ADVANCED_OPTIONS
757 This option allows you to set the maximum amount of memory which
758 will be used as "low memory", that is, memory which the kernel can
759 access directly, without having to set up a kernel virtual mapping.
760 This can be useful in optimizing the layout of kernel virtual
763 Say N here unless you know what you are doing.
766 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
769 config KERNEL_START_BOOL
770 bool "Set custom kernel base address"
771 depends on ADVANCED_OPTIONS
773 This option allows you to set the kernel virtual address at which
774 the kernel will map low memory (the kernel image will be linked at
775 this address). This can be useful in optimizing the virtual memory
776 layout of the system.
778 Say N here unless you know what you are doing.
781 hex "Virtual address of kernel base" if KERNEL_START_BOOL
784 config TASK_SIZE_BOOL
785 bool "Set custom user task size"
786 depends on ADVANCED_OPTIONS
788 This option allows you to set the amount of virtual address space
789 allocated to user tasks. This can be useful in optimizing the
790 virtual memory layout of the system.
792 Say N here unless you know what you are doing.
795 hex "Size of user task space" if TASK_SIZE_BOOL
798 config CONSISTENT_START_BOOL
799 bool "Set custom consistent memory pool address"
800 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
802 This option allows you to set the base virtual address
803 of the the consistent memory pool. This pool of virtual
804 memory is used to make consistent memory allocations.
806 config CONSISTENT_START
807 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
808 default "0xff100000" if NOT_COHERENT_CACHE
810 config CONSISTENT_SIZE_BOOL
811 bool "Set custom consistent memory pool size"
812 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
814 This option allows you to set the size of the the
815 consistent memory pool. This pool of virtual memory
816 is used to make consistent memory allocations.
818 config CONSISTENT_SIZE
819 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
820 default "0x00200000" if NOT_COHERENT_CACHE
822 config BOOT_LOAD_BOOL
823 bool "Set the boot link/load address"
824 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
826 This option allows you to set the initial load address of the zImage
827 or zImage.initrd file. This can be useful if you are on a board
828 which has a small amount of memory.
830 Say N here unless you know what you are doing.
833 hex "Link/load address for booting" if BOOT_LOAD_BOOL
834 default "0x00400000" if 40x || 8xx || 8260
835 default "0x01000000" if 44x
839 bool "Pinned Kernel TLBs (860 ONLY)"
840 depends on ADVANCED_OPTIONS && 8xx
846 default "0xc000000000000000"
851 source "drivers/Kconfig"
855 # XXX source "arch/ppc/8xx_io/Kconfig"
857 # XXX source "arch/ppc/8260_io/Kconfig"
859 source "arch/powerpc/platforms/iseries/Kconfig"
863 source "arch/powerpc/oprofile/Kconfig"
865 source "arch/powerpc/Kconfig.debug"
867 source "security/Kconfig"
871 depends on COMPAT && KEYS
874 source "crypto/Kconfig"