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
286 bool " Apple PowerMac based machines"
287 depends on PPC_MULTIPLATFORM
292 depends on PPC_PMAC && POWER4
297 bool " PowerPC Reference Platform (PReP) based machines"
298 depends on PPC_MULTIPLATFORM && PPC32
302 depends on PPC_MULTIPLATFORM && PPC64
303 bool " Maple 970FX Evaluation Board"
305 select MPIC_BROKEN_U3
308 This option enables support for the Maple 970FX Evaluation Board.
309 For more informations, refer to <http://www.970eval.com>
312 bool " Broadband Processor Architecture"
313 depends on PPC_MULTIPLATFORM && PPC64
317 depends on PPC_MULTIPLATFORM # for now
321 depends on PPC_PSERIES
327 depends on PPC_MULTIPLATFORM && PPC64
331 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
335 config MPIC_BROKEN_U3
346 depends on PPC_PSERIES || PPC_ISERIES
350 source "drivers/cpufreq/Kconfig"
353 bool "Support for Apple PowerBooks"
354 depends on CPU_FREQ && ADB_PMU && PPC32
355 select CPU_FREQ_TABLE
357 This adds support for frequency switching on Apple PowerBooks,
358 this currently includes some models of iBook & Titanium
361 config PPC601_SYNC_FIX
362 bool "Workarounds for PPC601 bugs"
363 depends on 6xx && (PPC_PREP || PPC_PMAC)
365 Some versions of the PPC601 (the first PowerPC chip) have bugs which
366 mean that extra synchronization instructions are required near
367 certain instructions, typically those that make major changes to the
368 CPU state. These extra instructions reduce performance slightly.
369 If you say N here, these extra instructions will not be included,
370 resulting in a kernel which will run faster but may not run at all
371 on some systems with the PPC601 chip.
373 If in doubt, say Y here.
376 bool "Thermal Management Support"
379 G3 and G4 processors have an on-chip temperature sensor called the
380 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
381 temperature within 2-4 degrees Celsius. This option shows the current
382 on-die temperature in /proc/cpuinfo if the cpu supports it.
384 Unfortunately, on some chip revisions, this sensor is very inaccurate
385 and in some cases, does not work at all, so don't assume the cpu
386 temp is actually what /proc/cpuinfo says it is.
389 bool "Interrupt driven TAU driver (DANGEROUS)"
392 The TAU supports an interrupt driven mode which causes an interrupt
393 whenever the temperature goes out of range. This is the fastest way
394 to get notified the temp has exceeded a range. With this option off,
395 a timer is used to re-check the temperature periodically.
397 However, on some cpus it appears that the TAU interrupt hardware
398 is buggy and can cause a situation which would lead unexplained hard
401 Unless you are extending the TAU driver, or enjoy kernel/hardware
402 debugging, leave this option off.
405 bool "Average high and low temp"
408 The TAU hardware can compare the temperature to an upper and lower
409 bound. The default behavior is to show both the upper and lower
410 bound in /proc/cpuinfo. If the range is large, the temperature is
411 either changing a lot, or the TAU hardware is broken (likely on some
412 G4's). If the range is small (around 4 degrees), the temperature is
413 relatively stable. If you say Y here, a single temperature value,
414 halfway between the upper and lower bounds, will be reported in
417 If in doubt, say N here.
420 source arch/powerpc/platforms/embedded6xx/Kconfig
421 source arch/powerpc/platforms/4xx/Kconfig
422 source arch/powerpc/platforms/85xx/Kconfig
423 source arch/powerpc/platforms/8xx/Kconfig
425 menu "Kernel options"
428 bool "High memory support"
431 source kernel/Kconfig.hz
432 source kernel/Kconfig.preempt
433 source "fs/Kconfig.binfmt"
435 # We optimistically allocate largepages from the VM, so make the limit
436 # large enough (16MB). This badly named config option is actually
438 config FORCE_MAX_ZONEORDER
443 config MATH_EMULATION
444 bool "Math emulation"
445 depends on 4xx || 8xx || E200 || E500
447 Some PowerPC chips designed for embedded applications do not have
448 a floating-point unit and therefore do not implement the
449 floating-point instructions in the PowerPC instruction set. If you
450 say Y here, the kernel will include code to emulate a floating-point
451 unit, which will allow programs that use floating-point
455 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
456 depends on EXPERIMENTAL && PPC64
459 Cause IO segments sent to a device for DMA to be merged virtually
460 by the IOMMU when they happen to have been allocated contiguously.
461 This doesn't add pressure to the IOMMU allocator. However, some
462 drivers don't support getting large merged segments coming back
463 from *_map_sg(). Say Y if you know the drivers you are using are
464 properly handling this case.
467 bool "Support for enabling/disabling CPUs"
468 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
470 Say Y here to be able to disable and re-enable individual
471 CPUs at runtime on SMP machines.
473 Say N if you are unsure.
476 bool "kexec system call (EXPERIMENTAL)"
477 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
479 kexec is a system call that implements the ability to shutdown your
480 current kernel, and to start another kernel. It is like a reboot
481 but it is indepedent of the system firmware. And like a reboot
482 you can start any kernel with it, not just Linux.
484 The name comes from the similiarity to the exec system call.
486 It is an ongoing process to be certain the hardware in a machine
487 is properly shutdown, so do not be surprised if this code does not
488 initially work for you. It may help to enable device hotplugging
489 support. As of this writing the exact hardware interface is
490 strongly in flux, so no good recommendation can be made.
494 depends on 8xx || 8260
498 bool "PC PS/2 style Keyboard"
499 depends on 4xx || CPM2
502 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
503 default y if PPC_PREP
506 bool "Distribute interrupts on all CPUs by default"
507 depends on SMP && !MV64360
509 This option gives the kernel permission to distribute IRQs across
510 multiple CPUs. Saying N here will route all IRQs to the first
511 CPU. Generally saying Y is safe, although some problems have been
512 reported with SMP Power Macintoshes with this option enabled.
514 source "arch/powerpc/platforms/pseries/Kconfig"
516 config ARCH_SELECT_MEMORY_MODEL
520 config ARCH_FLATMEM_ENABLE
522 depends on PPC64 && !NUMA
524 config ARCH_DISCONTIGMEM_ENABLE
526 depends on SMP && PPC_PSERIES
528 config ARCH_DISCONTIGMEM_DEFAULT
530 depends on ARCH_DISCONTIGMEM_ENABLE
532 config ARCH_FLATMEM_ENABLE
536 config ARCH_SPARSEMEM_ENABLE
538 depends on ARCH_DISCONTIGMEM_ENABLE
542 config HAVE_ARCH_EARLY_PFN_TO_NID
544 depends on NEED_MULTIPLE_NODES
546 # Some NUMA nodes have memory ranges that span
547 # other nodes. Even though a pfn is valid and
548 # between a node's start and end pfns, it may not
549 # reside on that node.
551 # This is a relatively temporary hack that should
552 # be able to go away when sparsemem is fully in
555 config NODES_SPAN_OTHER_NODES
557 depends on NEED_MULTIPLE_NODES
561 default y if DISCONTIGMEM || SPARSEMEM
564 bool "SMT (Hyperthreading) scheduler support"
565 depends on PPC64 && SMP
568 SMT scheduler support improves the CPU scheduler's decision making
569 when dealing with POWER5 cpus at a cost of slightly increased
570 overhead in some places. If unsure say N here.
572 config PROC_DEVICETREE
573 bool "Support for device tree in /proc"
576 This option adds a device-tree directory under /proc which contains
577 an image of the device tree that the kernel copies from Open
578 Firmware or other boot firmware. If unsure, say Y here.
580 source "arch/powerpc/platforms/prep/Kconfig"
583 bool "Default bootloader kernel arguments"
584 depends on !PPC_ISERIES
587 string "Initial kernel command string"
588 depends on CMDLINE_BOOL
589 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
591 On some platforms, there is currently no way for the boot loader to
592 pass arguments to the kernel. For these platforms, you can supply
593 some command-line options at build time by entering them here. In
594 most cases you will need to specify the root device here.
597 source kernel/power/Kconfig
601 bool "Enable seccomp to safely compute untrusted bytecode"
605 This kernel feature is useful for number crunching applications
606 that may need to compute untrusted bytecode during their
607 execution. By using pipes or other transports made available to
608 the process as file descriptors supporting the read/write
609 syscalls, it's possible to isolate those applications in
610 their own address space using seccomp. Once seccomp is
611 enabled via /proc/<pid>/seccomp, it cannot be disabled
612 and the task is only allowed to execute a few safe syscalls
613 defined by each seccomp mode.
615 If unsure, say Y. Only embedded should say N here.
626 bool "Support for ISA-bus hardware"
627 depends on PPC_PREP || PPC_CHRP
629 Find out whether you have ISA slots on your motherboard. ISA is the
630 name of a bus system, i.e. the way the CPU talks to the other stuff
631 inside your box. If you have an Apple machine, say N here; if you
632 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
633 you have an embedded board, consult your board documentation.
635 config GENERIC_ISA_DMA
637 depends on PPC64 || POWER4 || 6xx && !CPM2
646 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
651 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
652 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
653 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
654 default PCI_QSPAN if !4xx && !CPM2 && 8xx
656 Find out whether your system includes a PCI bus. PCI is the name of
657 a bus system, i.e. the way the CPU talks to the other stuff inside
658 your box. If you say Y here, the kernel will include drivers and
659 infrastructure code to support PCI bus devices.
666 bool " Supprt for 2nd PCI host controller"
667 depends on PCI && MPC834x
668 default y if MPC834x_SYS
672 depends on !4xx && !CPM2 && 8xx
674 Say Y here if you have a system based on a Motorola 8xx-series
675 embedded processor with a QSPAN PCI interface, otherwise say N.
679 depends on PCI && 8260
683 bool " Enable workaround for MPC826x erratum PCI 9"
684 depends on PCI_8260 && !ADS8272
688 prompt " IDMA channel for PCI 9 workaround"
691 config 8260_PCI9_IDMA1
694 config 8260_PCI9_IDMA2
697 config 8260_PCI9_IDMA3
700 config 8260_PCI9_IDMA4
705 source "drivers/pci/Kconfig"
707 source "drivers/pcmcia/Kconfig"
709 source "drivers/pci/hotplug/Kconfig"
713 menu "Advanced setup"
716 config ADVANCED_OPTIONS
717 bool "Prompt for advanced kernel configuration options"
719 This option will enable prompting for a variety of advanced kernel
720 configuration options. These options can cause the kernel to not
721 work if they are set incorrectly, but can be used to optimize certain
722 aspects of kernel memory management.
724 Unless you know what you are doing, say N here.
726 comment "Default settings for advanced configuration options are used"
727 depends on !ADVANCED_OPTIONS
729 config HIGHMEM_START_BOOL
730 bool "Set high memory pool address"
731 depends on ADVANCED_OPTIONS && HIGHMEM
733 This option allows you to set the base address of the kernel virtual
734 area used to map high memory pages. This can be useful in
735 optimizing the layout of kernel virtual memory.
737 Say N here unless you know what you are doing.
740 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
743 config LOWMEM_SIZE_BOOL
744 bool "Set maximum low memory"
745 depends on ADVANCED_OPTIONS
747 This option allows you to set the maximum amount of memory which
748 will be used as "low memory", that is, memory which the kernel can
749 access directly, without having to set up a kernel virtual mapping.
750 This can be useful in optimizing the layout of kernel virtual
753 Say N here unless you know what you are doing.
756 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
759 config KERNEL_START_BOOL
760 bool "Set custom kernel base address"
761 depends on ADVANCED_OPTIONS
763 This option allows you to set the kernel virtual address at which
764 the kernel will map low memory (the kernel image will be linked at
765 this address). This can be useful in optimizing the virtual memory
766 layout of the system.
768 Say N here unless you know what you are doing.
771 hex "Virtual address of kernel base" if KERNEL_START_BOOL
774 config TASK_SIZE_BOOL
775 bool "Set custom user task size"
776 depends on ADVANCED_OPTIONS
778 This option allows you to set the amount of virtual address space
779 allocated to user tasks. This can be useful in optimizing the
780 virtual memory layout of the system.
782 Say N here unless you know what you are doing.
785 hex "Size of user task space" if TASK_SIZE_BOOL
788 config CONSISTENT_START_BOOL
789 bool "Set custom consistent memory pool address"
790 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
792 This option allows you to set the base virtual address
793 of the the consistent memory pool. This pool of virtual
794 memory is used to make consistent memory allocations.
796 config CONSISTENT_START
797 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
798 default "0xff100000" if NOT_COHERENT_CACHE
800 config CONSISTENT_SIZE_BOOL
801 bool "Set custom consistent memory pool size"
802 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
804 This option allows you to set the size of the the
805 consistent memory pool. This pool of virtual memory
806 is used to make consistent memory allocations.
808 config CONSISTENT_SIZE
809 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
810 default "0x00200000" if NOT_COHERENT_CACHE
812 config BOOT_LOAD_BOOL
813 bool "Set the boot link/load address"
814 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
816 This option allows you to set the initial load address of the zImage
817 or zImage.initrd file. This can be useful if you are on a board
818 which has a small amount of memory.
820 Say N here unless you know what you are doing.
823 hex "Link/load address for booting" if BOOT_LOAD_BOOL
824 default "0x00400000" if 40x || 8xx || 8260
825 default "0x01000000" if 44x
829 bool "Pinned Kernel TLBs (860 ONLY)"
830 depends on ADVANCED_OPTIONS && 8xx
836 default "0xc000000000000000"
841 source "drivers/Kconfig"
845 # XXX source "arch/ppc/8xx_io/Kconfig"
847 # XXX source "arch/ppc/8260_io/Kconfig"
849 source "arch/powerpc/platforms/iseries/Kconfig"
853 source "arch/powerpc/oprofile/Kconfig"
855 source "arch/powerpc/Kconfig.debug"
857 source "security/Kconfig"
861 depends on COMPAT && KEYS
864 source "crypto/Kconfig"