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
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
306 bool " PowerPC Reference Platform (PReP) based machines"
307 depends on PPC_MULTIPLATFORM && PPC32
309 select PPC_INDIRECT_PCI
313 depends on PPC_MULTIPLATFORM && PPC64
314 bool " Maple 970FX Evaluation Board"
316 select MPIC_BROKEN_U3
319 This option enables support for the Maple 970FX Evaluation Board.
320 For more informations, refer to <http://www.970eval.com>
323 bool " Broadband Processor Architecture"
324 depends on PPC_MULTIPLATFORM && PPC64
329 depends on PPC_MULTIPLATFORM # for now
333 depends on PPC_PSERIES
339 depends on PPC_MULTIPLATFORM && PPC64
343 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
351 config RTAS_ERROR_LOGGING
356 config MPIC_BROKEN_U3
367 depends on PPC_PSERIES || PPC_ISERIES
375 source "drivers/cpufreq/Kconfig"
378 bool "Support for Apple PowerBooks"
379 depends on CPU_FREQ && ADB_PMU && PPC32
380 select CPU_FREQ_TABLE
382 This adds support for frequency switching on Apple PowerBooks,
383 this currently includes some models of iBook & Titanium
386 config PPC601_SYNC_FIX
387 bool "Workarounds for PPC601 bugs"
388 depends on 6xx && (PPC_PREP || PPC_PMAC)
390 Some versions of the PPC601 (the first PowerPC chip) have bugs which
391 mean that extra synchronization instructions are required near
392 certain instructions, typically those that make major changes to the
393 CPU state. These extra instructions reduce performance slightly.
394 If you say N here, these extra instructions will not be included,
395 resulting in a kernel which will run faster but may not run at all
396 on some systems with the PPC601 chip.
398 If in doubt, say Y here.
401 bool "Thermal Management Support"
404 G3 and G4 processors have an on-chip temperature sensor called the
405 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
406 temperature within 2-4 degrees Celsius. This option shows the current
407 on-die temperature in /proc/cpuinfo if the cpu supports it.
409 Unfortunately, on some chip revisions, this sensor is very inaccurate
410 and in some cases, does not work at all, so don't assume the cpu
411 temp is actually what /proc/cpuinfo says it is.
414 bool "Interrupt driven TAU driver (DANGEROUS)"
417 The TAU supports an interrupt driven mode which causes an interrupt
418 whenever the temperature goes out of range. This is the fastest way
419 to get notified the temp has exceeded a range. With this option off,
420 a timer is used to re-check the temperature periodically.
422 However, on some cpus it appears that the TAU interrupt hardware
423 is buggy and can cause a situation which would lead unexplained hard
426 Unless you are extending the TAU driver, or enjoy kernel/hardware
427 debugging, leave this option off.
430 bool "Average high and low temp"
433 The TAU hardware can compare the temperature to an upper and lower
434 bound. The default behavior is to show both the upper and lower
435 bound in /proc/cpuinfo. If the range is large, the temperature is
436 either changing a lot, or the TAU hardware is broken (likely on some
437 G4's). If the range is small (around 4 degrees), the temperature is
438 relatively stable. If you say Y here, a single temperature value,
439 halfway between the upper and lower bounds, will be reported in
442 If in doubt, say N here.
445 source arch/powerpc/platforms/embedded6xx/Kconfig
446 source arch/powerpc/platforms/4xx/Kconfig
447 source arch/powerpc/platforms/85xx/Kconfig
448 source arch/powerpc/platforms/8xx/Kconfig
450 menu "Kernel options"
453 bool "High memory support"
456 source kernel/Kconfig.hz
457 source kernel/Kconfig.preempt
458 source "fs/Kconfig.binfmt"
460 # We optimistically allocate largepages from the VM, so make the limit
461 # large enough (16MB). This badly named config option is actually
463 config FORCE_MAX_ZONEORDER
468 config MATH_EMULATION
469 bool "Math emulation"
470 depends on 4xx || 8xx || E200 || E500
472 Some PowerPC chips designed for embedded applications do not have
473 a floating-point unit and therefore do not implement the
474 floating-point instructions in the PowerPC instruction set. If you
475 say Y here, the kernel will include code to emulate a floating-point
476 unit, which will allow programs that use floating-point
480 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
481 depends on EXPERIMENTAL && PPC64
484 Cause IO segments sent to a device for DMA to be merged virtually
485 by the IOMMU when they happen to have been allocated contiguously.
486 This doesn't add pressure to the IOMMU allocator. However, some
487 drivers don't support getting large merged segments coming back
488 from *_map_sg(). Say Y if you know the drivers you are using are
489 properly handling this case.
492 bool "Support for enabling/disabling CPUs"
493 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
495 Say Y here to be able to disable and re-enable individual
496 CPUs at runtime on SMP machines.
498 Say N if you are unsure.
501 bool "kexec system call (EXPERIMENTAL)"
502 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
504 kexec is a system call that implements the ability to shutdown your
505 current kernel, and to start another kernel. It is like a reboot
506 but it is indepedent of the system firmware. And like a reboot
507 you can start any kernel with it, not just Linux.
509 The name comes from the similiarity to the exec system call.
511 It is an ongoing process to be certain the hardware in a machine
512 is properly shutdown, so do not be surprised if this code does not
513 initially work for you. It may help to enable device hotplugging
514 support. As of this writing the exact hardware interface is
515 strongly in flux, so no good recommendation can be made.
519 depends on 8xx || 8260
523 bool "PC PS/2 style Keyboard"
524 depends on 4xx || CPM2
527 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
528 default y if PPC_PREP
531 bool "Distribute interrupts on all CPUs by default"
532 depends on SMP && !MV64360
534 This option gives the kernel permission to distribute IRQs across
535 multiple CPUs. Saying N here will route all IRQs to the first
536 CPU. Generally saying Y is safe, although some problems have been
537 reported with SMP Power Macintoshes with this option enabled.
539 source "arch/powerpc/platforms/pseries/Kconfig"
544 default y if SMP && PPC_PSERIES
546 config ARCH_SELECT_MEMORY_MODEL
550 config ARCH_FLATMEM_ENABLE
552 depends on PPC64 && !NUMA
554 config ARCH_DISCONTIGMEM_ENABLE
556 depends on SMP && PPC_PSERIES
558 config ARCH_DISCONTIGMEM_DEFAULT
560 depends on ARCH_DISCONTIGMEM_ENABLE
562 config ARCH_SPARSEMEM_ENABLE
564 depends on ARCH_DISCONTIGMEM_ENABLE
568 config HAVE_ARCH_EARLY_PFN_TO_NID
570 depends on NEED_MULTIPLE_NODES
572 # Some NUMA nodes have memory ranges that span
573 # other nodes. Even though a pfn is valid and
574 # between a node's start and end pfns, it may not
575 # reside on that node.
577 # This is a relatively temporary hack that should
578 # be able to go away when sparsemem is fully in
581 config NODES_SPAN_OTHER_NODES
583 depends on NEED_MULTIPLE_NODES
586 bool "SMT (Hyperthreading) scheduler support"
587 depends on PPC64 && SMP
590 SMT scheduler support improves the CPU scheduler's decision making
591 when dealing with POWER5 cpus at a cost of slightly increased
592 overhead in some places. If unsure say N here.
594 config PROC_DEVICETREE
595 bool "Support for device tree in /proc"
598 This option adds a device-tree directory under /proc which contains
599 an image of the device tree that the kernel copies from Open
600 Firmware or other boot firmware. If unsure, say Y here.
602 source "arch/powerpc/platforms/prep/Kconfig"
605 bool "Default bootloader kernel arguments"
606 depends on !PPC_ISERIES
609 string "Initial kernel command string"
610 depends on CMDLINE_BOOL
611 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
613 On some platforms, there is currently no way for the boot loader to
614 pass arguments to the kernel. For these platforms, you can supply
615 some command-line options at build time by entering them here. In
616 most cases you will need to specify the root device here.
619 source kernel/power/Kconfig
623 bool "Enable seccomp to safely compute untrusted bytecode"
627 This kernel feature is useful for number crunching applications
628 that may need to compute untrusted bytecode during their
629 execution. By using pipes or other transports made available to
630 the process as file descriptors supporting the read/write
631 syscalls, it's possible to isolate those applications in
632 their own address space using seccomp. Once seccomp is
633 enabled via /proc/<pid>/seccomp, it cannot be disabled
634 and the task is only allowed to execute a few safe syscalls
635 defined by each seccomp mode.
637 If unsure, say Y. Only embedded should say N here.
648 bool "Support for ISA-bus hardware"
649 depends on PPC_PREP || PPC_CHRP
652 Find out whether you have ISA slots on your motherboard. ISA is the
653 name of a bus system, i.e. the way the CPU talks to the other stuff
654 inside your box. If you have an Apple machine, say N here; if you
655 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
656 you have an embedded board, consult your board documentation.
658 config GENERIC_ISA_DMA
660 depends on PPC64 || POWER4 || 6xx && !CPM2
668 config PPC_INDIRECT_PCI
671 default y if 40x || 44x || 85xx || 83xx
680 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
685 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
686 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
687 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
688 default PCI_QSPAN if !4xx && !CPM2 && 8xx
690 Find out whether your system includes a PCI bus. PCI is the name of
691 a bus system, i.e. the way the CPU talks to the other stuff inside
692 your box. If you say Y here, the kernel will include drivers and
693 infrastructure code to support PCI bus devices.
700 bool " Supprt for 2nd PCI host controller"
701 depends on PCI && MPC834x
702 default y if MPC834x_SYS
706 depends on !4xx && !CPM2 && 8xx
709 Say Y here if you have a system based on a Motorola 8xx-series
710 embedded processor with a QSPAN PCI interface, otherwise say N.
714 depends on PCI && 8260
715 select PPC_INDIRECT_PCI
719 bool " Enable workaround for MPC826x erratum PCI 9"
720 depends on PCI_8260 && !ADS8272
724 prompt " IDMA channel for PCI 9 workaround"
727 config 8260_PCI9_IDMA1
730 config 8260_PCI9_IDMA2
733 config 8260_PCI9_IDMA3
736 config 8260_PCI9_IDMA4
741 source "drivers/pci/Kconfig"
743 source "drivers/pcmcia/Kconfig"
745 source "drivers/pci/hotplug/Kconfig"
749 menu "Advanced setup"
752 config ADVANCED_OPTIONS
753 bool "Prompt for advanced kernel configuration options"
755 This option will enable prompting for a variety of advanced kernel
756 configuration options. These options can cause the kernel to not
757 work if they are set incorrectly, but can be used to optimize certain
758 aspects of kernel memory management.
760 Unless you know what you are doing, say N here.
762 comment "Default settings for advanced configuration options are used"
763 depends on !ADVANCED_OPTIONS
765 config HIGHMEM_START_BOOL
766 bool "Set high memory pool address"
767 depends on ADVANCED_OPTIONS && HIGHMEM
769 This option allows you to set the base address of the kernel virtual
770 area used to map high memory pages. This can be useful in
771 optimizing the layout of kernel virtual memory.
773 Say N here unless you know what you are doing.
776 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
779 config LOWMEM_SIZE_BOOL
780 bool "Set maximum low memory"
781 depends on ADVANCED_OPTIONS
783 This option allows you to set the maximum amount of memory which
784 will be used as "low memory", that is, memory which the kernel can
785 access directly, without having to set up a kernel virtual mapping.
786 This can be useful in optimizing the layout of kernel virtual
789 Say N here unless you know what you are doing.
792 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
795 config KERNEL_START_BOOL
796 bool "Set custom kernel base address"
797 depends on ADVANCED_OPTIONS
799 This option allows you to set the kernel virtual address at which
800 the kernel will map low memory (the kernel image will be linked at
801 this address). This can be useful in optimizing the virtual memory
802 layout of the system.
804 Say N here unless you know what you are doing.
807 hex "Virtual address of kernel base" if KERNEL_START_BOOL
810 config TASK_SIZE_BOOL
811 bool "Set custom user task size"
812 depends on ADVANCED_OPTIONS
814 This option allows you to set the amount of virtual address space
815 allocated to user tasks. This can be useful in optimizing the
816 virtual memory layout of the system.
818 Say N here unless you know what you are doing.
821 hex "Size of user task space" if TASK_SIZE_BOOL
824 config CONSISTENT_START_BOOL
825 bool "Set custom consistent memory pool address"
826 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
828 This option allows you to set the base virtual address
829 of the the consistent memory pool. This pool of virtual
830 memory is used to make consistent memory allocations.
832 config CONSISTENT_START
833 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
834 default "0xff100000" if NOT_COHERENT_CACHE
836 config CONSISTENT_SIZE_BOOL
837 bool "Set custom consistent memory pool size"
838 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
840 This option allows you to set the size of the the
841 consistent memory pool. This pool of virtual memory
842 is used to make consistent memory allocations.
844 config CONSISTENT_SIZE
845 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
846 default "0x00200000" if NOT_COHERENT_CACHE
848 config BOOT_LOAD_BOOL
849 bool "Set the boot link/load address"
850 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
852 This option allows you to set the initial load address of the zImage
853 or zImage.initrd file. This can be useful if you are on a board
854 which has a small amount of memory.
856 Say N here unless you know what you are doing.
859 hex "Link/load address for booting" if BOOT_LOAD_BOOL
860 default "0x00400000" if 40x || 8xx || 8260
861 default "0x01000000" if 44x
865 bool "Pinned Kernel TLBs (860 ONLY)"
866 depends on ADVANCED_OPTIONS && 8xx
872 default "0xc000000000000000"
877 source "drivers/Kconfig"
881 # XXX source "arch/ppc/8xx_io/Kconfig"
883 # XXX source "arch/ppc/8260_io/Kconfig"
885 source "arch/powerpc/platforms/iseries/Kconfig"
889 source "arch/powerpc/oprofile/Kconfig"
891 source "arch/powerpc/Kconfig.debug"
893 source "security/Kconfig"
897 depends on COMPAT && KEYS
900 source "crypto/Kconfig"