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
292 bool " Apple PowerMac based machines"
293 depends on PPC_MULTIPLATFORM
294 select PPC_INDIRECT_PCI if PPC32
299 depends on PPC_PMAC && POWER4
304 bool " PowerPC Reference Platform (PReP) based machines"
305 depends on PPC_MULTIPLATFORM && PPC32
307 select PPC_INDIRECT_PCI
311 depends on PPC_MULTIPLATFORM && PPC64
312 bool " Maple 970FX Evaluation Board"
314 select MPIC_BROKEN_U3
317 This option enables support for the Maple 970FX Evaluation Board.
318 For more informations, refer to <http://www.970eval.com>
321 bool " Broadband Processor Architecture"
322 depends on PPC_MULTIPLATFORM && PPC64
327 depends on PPC_MULTIPLATFORM # for now
331 depends on PPC_PSERIES
337 depends on PPC_MULTIPLATFORM && PPC64
341 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
349 config RTAS_ERROR_LOGGING
354 config MPIC_BROKEN_U3
365 depends on PPC_PSERIES || PPC_ISERIES
369 source "drivers/cpufreq/Kconfig"
372 bool "Support for Apple PowerBooks"
373 depends on CPU_FREQ && ADB_PMU && PPC32
374 select CPU_FREQ_TABLE
376 This adds support for frequency switching on Apple PowerBooks,
377 this currently includes some models of iBook & Titanium
380 config PPC601_SYNC_FIX
381 bool "Workarounds for PPC601 bugs"
382 depends on 6xx && (PPC_PREP || PPC_PMAC)
384 Some versions of the PPC601 (the first PowerPC chip) have bugs which
385 mean that extra synchronization instructions are required near
386 certain instructions, typically those that make major changes to the
387 CPU state. These extra instructions reduce performance slightly.
388 If you say N here, these extra instructions will not be included,
389 resulting in a kernel which will run faster but may not run at all
390 on some systems with the PPC601 chip.
392 If in doubt, say Y here.
395 bool "Thermal Management Support"
398 G3 and G4 processors have an on-chip temperature sensor called the
399 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
400 temperature within 2-4 degrees Celsius. This option shows the current
401 on-die temperature in /proc/cpuinfo if the cpu supports it.
403 Unfortunately, on some chip revisions, this sensor is very inaccurate
404 and in some cases, does not work at all, so don't assume the cpu
405 temp is actually what /proc/cpuinfo says it is.
408 bool "Interrupt driven TAU driver (DANGEROUS)"
411 The TAU supports an interrupt driven mode which causes an interrupt
412 whenever the temperature goes out of range. This is the fastest way
413 to get notified the temp has exceeded a range. With this option off,
414 a timer is used to re-check the temperature periodically.
416 However, on some cpus it appears that the TAU interrupt hardware
417 is buggy and can cause a situation which would lead unexplained hard
420 Unless you are extending the TAU driver, or enjoy kernel/hardware
421 debugging, leave this option off.
424 bool "Average high and low temp"
427 The TAU hardware can compare the temperature to an upper and lower
428 bound. The default behavior is to show both the upper and lower
429 bound in /proc/cpuinfo. If the range is large, the temperature is
430 either changing a lot, or the TAU hardware is broken (likely on some
431 G4's). If the range is small (around 4 degrees), the temperature is
432 relatively stable. If you say Y here, a single temperature value,
433 halfway between the upper and lower bounds, will be reported in
436 If in doubt, say N here.
439 source arch/powerpc/platforms/embedded6xx/Kconfig
440 source arch/powerpc/platforms/4xx/Kconfig
441 source arch/powerpc/platforms/85xx/Kconfig
442 source arch/powerpc/platforms/8xx/Kconfig
444 menu "Kernel options"
447 bool "High memory support"
450 source kernel/Kconfig.hz
451 source kernel/Kconfig.preempt
452 source "fs/Kconfig.binfmt"
454 # We optimistically allocate largepages from the VM, so make the limit
455 # large enough (16MB). This badly named config option is actually
457 config FORCE_MAX_ZONEORDER
462 config MATH_EMULATION
463 bool "Math emulation"
464 depends on 4xx || 8xx || E200 || E500
466 Some PowerPC chips designed for embedded applications do not have
467 a floating-point unit and therefore do not implement the
468 floating-point instructions in the PowerPC instruction set. If you
469 say Y here, the kernel will include code to emulate a floating-point
470 unit, which will allow programs that use floating-point
474 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
475 depends on EXPERIMENTAL && PPC64
478 Cause IO segments sent to a device for DMA to be merged virtually
479 by the IOMMU when they happen to have been allocated contiguously.
480 This doesn't add pressure to the IOMMU allocator. However, some
481 drivers don't support getting large merged segments coming back
482 from *_map_sg(). Say Y if you know the drivers you are using are
483 properly handling this case.
486 bool "Support for enabling/disabling CPUs"
487 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
489 Say Y here to be able to disable and re-enable individual
490 CPUs at runtime on SMP machines.
492 Say N if you are unsure.
495 bool "kexec system call (EXPERIMENTAL)"
496 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
498 kexec is a system call that implements the ability to shutdown your
499 current kernel, and to start another kernel. It is like a reboot
500 but it is indepedent of the system firmware. And like a reboot
501 you can start any kernel with it, not just Linux.
503 The name comes from the similiarity to the exec system call.
505 It is an ongoing process to be certain the hardware in a machine
506 is properly shutdown, so do not be surprised if this code does not
507 initially work for you. It may help to enable device hotplugging
508 support. As of this writing the exact hardware interface is
509 strongly in flux, so no good recommendation can be made.
513 depends on 8xx || 8260
517 bool "PC PS/2 style Keyboard"
518 depends on 4xx || CPM2
521 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
522 default y if PPC_PREP
525 bool "Distribute interrupts on all CPUs by default"
526 depends on SMP && !MV64360
528 This option gives the kernel permission to distribute IRQs across
529 multiple CPUs. Saying N here will route all IRQs to the first
530 CPU. Generally saying Y is safe, although some problems have been
531 reported with SMP Power Macintoshes with this option enabled.
533 source "arch/powerpc/platforms/pseries/Kconfig"
535 config ARCH_SELECT_MEMORY_MODEL
539 config ARCH_FLATMEM_ENABLE
541 depends on PPC64 && !NUMA
543 config ARCH_DISCONTIGMEM_ENABLE
545 depends on SMP && PPC_PSERIES
547 config ARCH_DISCONTIGMEM_DEFAULT
549 depends on ARCH_DISCONTIGMEM_ENABLE
551 config ARCH_FLATMEM_ENABLE
555 config ARCH_SPARSEMEM_ENABLE
557 depends on ARCH_DISCONTIGMEM_ENABLE
561 config HAVE_ARCH_EARLY_PFN_TO_NID
563 depends on NEED_MULTIPLE_NODES
565 # Some NUMA nodes have memory ranges that span
566 # other nodes. Even though a pfn is valid and
567 # between a node's start and end pfns, it may not
568 # reside on that node.
570 # This is a relatively temporary hack that should
571 # be able to go away when sparsemem is fully in
574 config NODES_SPAN_OTHER_NODES
576 depends on NEED_MULTIPLE_NODES
580 default y if DISCONTIGMEM || SPARSEMEM
583 bool "SMT (Hyperthreading) scheduler support"
584 depends on PPC64 && SMP
587 SMT scheduler support improves the CPU scheduler's decision making
588 when dealing with POWER5 cpus at a cost of slightly increased
589 overhead in some places. If unsure say N here.
591 config PROC_DEVICETREE
592 bool "Support for device tree in /proc"
595 This option adds a device-tree directory under /proc which contains
596 an image of the device tree that the kernel copies from Open
597 Firmware or other boot firmware. If unsure, say Y here.
599 source "arch/powerpc/platforms/prep/Kconfig"
602 bool "Default bootloader kernel arguments"
603 depends on !PPC_ISERIES
606 string "Initial kernel command string"
607 depends on CMDLINE_BOOL
608 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
610 On some platforms, there is currently no way for the boot loader to
611 pass arguments to the kernel. For these platforms, you can supply
612 some command-line options at build time by entering them here. In
613 most cases you will need to specify the root device here.
616 source kernel/power/Kconfig
620 bool "Enable seccomp to safely compute untrusted bytecode"
624 This kernel feature is useful for number crunching applications
625 that may need to compute untrusted bytecode during their
626 execution. By using pipes or other transports made available to
627 the process as file descriptors supporting the read/write
628 syscalls, it's possible to isolate those applications in
629 their own address space using seccomp. Once seccomp is
630 enabled via /proc/<pid>/seccomp, it cannot be disabled
631 and the task is only allowed to execute a few safe syscalls
632 defined by each seccomp mode.
634 If unsure, say Y. Only embedded should say N here.
645 bool "Support for ISA-bus hardware"
646 depends on PPC_PREP || PPC_CHRP
649 Find out whether you have ISA slots on your motherboard. ISA is the
650 name of a bus system, i.e. the way the CPU talks to the other stuff
651 inside your box. If you have an Apple machine, say N here; if you
652 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
653 you have an embedded board, consult your board documentation.
655 config GENERIC_ISA_DMA
657 depends on PPC64 || POWER4 || 6xx && !CPM2
665 config PPC_INDIRECT_PCI
668 default y if 40x || 44x || 85xx || 83xx
677 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
682 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
683 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
684 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
685 default PCI_QSPAN if !4xx && !CPM2 && 8xx
687 Find out whether your system includes a PCI bus. PCI is the name of
688 a bus system, i.e. the way the CPU talks to the other stuff inside
689 your box. If you say Y here, the kernel will include drivers and
690 infrastructure code to support PCI bus devices.
697 bool " Supprt for 2nd PCI host controller"
698 depends on PCI && MPC834x
699 default y if MPC834x_SYS
703 depends on !4xx && !CPM2 && 8xx
706 Say Y here if you have a system based on a Motorola 8xx-series
707 embedded processor with a QSPAN PCI interface, otherwise say N.
711 depends on PCI && 8260
712 select PPC_INDIRECT_PCI
716 bool " Enable workaround for MPC826x erratum PCI 9"
717 depends on PCI_8260 && !ADS8272
721 prompt " IDMA channel for PCI 9 workaround"
724 config 8260_PCI9_IDMA1
727 config 8260_PCI9_IDMA2
730 config 8260_PCI9_IDMA3
733 config 8260_PCI9_IDMA4
738 source "drivers/pci/Kconfig"
740 source "drivers/pcmcia/Kconfig"
742 source "drivers/pci/hotplug/Kconfig"
746 menu "Advanced setup"
749 config ADVANCED_OPTIONS
750 bool "Prompt for advanced kernel configuration options"
752 This option will enable prompting for a variety of advanced kernel
753 configuration options. These options can cause the kernel to not
754 work if they are set incorrectly, but can be used to optimize certain
755 aspects of kernel memory management.
757 Unless you know what you are doing, say N here.
759 comment "Default settings for advanced configuration options are used"
760 depends on !ADVANCED_OPTIONS
762 config HIGHMEM_START_BOOL
763 bool "Set high memory pool address"
764 depends on ADVANCED_OPTIONS && HIGHMEM
766 This option allows you to set the base address of the kernel virtual
767 area used to map high memory pages. This can be useful in
768 optimizing the layout of kernel virtual memory.
770 Say N here unless you know what you are doing.
773 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
776 config LOWMEM_SIZE_BOOL
777 bool "Set maximum low memory"
778 depends on ADVANCED_OPTIONS
780 This option allows you to set the maximum amount of memory which
781 will be used as "low memory", that is, memory which the kernel can
782 access directly, without having to set up a kernel virtual mapping.
783 This can be useful in optimizing the layout of kernel virtual
786 Say N here unless you know what you are doing.
789 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
792 config KERNEL_START_BOOL
793 bool "Set custom kernel base address"
794 depends on ADVANCED_OPTIONS
796 This option allows you to set the kernel virtual address at which
797 the kernel will map low memory (the kernel image will be linked at
798 this address). This can be useful in optimizing the virtual memory
799 layout of the system.
801 Say N here unless you know what you are doing.
804 hex "Virtual address of kernel base" if KERNEL_START_BOOL
807 config TASK_SIZE_BOOL
808 bool "Set custom user task size"
809 depends on ADVANCED_OPTIONS
811 This option allows you to set the amount of virtual address space
812 allocated to user tasks. This can be useful in optimizing the
813 virtual memory layout of the system.
815 Say N here unless you know what you are doing.
818 hex "Size of user task space" if TASK_SIZE_BOOL
821 config CONSISTENT_START_BOOL
822 bool "Set custom consistent memory pool address"
823 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
825 This option allows you to set the base virtual address
826 of the the consistent memory pool. This pool of virtual
827 memory is used to make consistent memory allocations.
829 config CONSISTENT_START
830 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
831 default "0xff100000" if NOT_COHERENT_CACHE
833 config CONSISTENT_SIZE_BOOL
834 bool "Set custom consistent memory pool size"
835 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
837 This option allows you to set the size of the the
838 consistent memory pool. This pool of virtual memory
839 is used to make consistent memory allocations.
841 config CONSISTENT_SIZE
842 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
843 default "0x00200000" if NOT_COHERENT_CACHE
845 config BOOT_LOAD_BOOL
846 bool "Set the boot link/load address"
847 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
849 This option allows you to set the initial load address of the zImage
850 or zImage.initrd file. This can be useful if you are on a board
851 which has a small amount of memory.
853 Say N here unless you know what you are doing.
856 hex "Link/load address for booting" if BOOT_LOAD_BOOL
857 default "0x00400000" if 40x || 8xx || 8260
858 default "0x01000000" if 44x
862 bool "Pinned Kernel TLBs (860 ONLY)"
863 depends on ADVANCED_OPTIONS && 8xx
869 default "0xc000000000000000"
874 source "drivers/Kconfig"
878 # XXX source "arch/ppc/8xx_io/Kconfig"
880 # XXX source "arch/ppc/8260_io/Kconfig"
882 source "arch/powerpc/platforms/iseries/Kconfig"
886 source "arch/powerpc/oprofile/Kconfig"
888 source "arch/powerpc/Kconfig.debug"
890 source "security/Kconfig"
894 depends on COMPAT && KEYS
897 source "crypto/Kconfig"