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
300 depends on PPC_PMAC && POWER4
305 bool " PowerPC Reference Platform (PReP) based machines"
306 depends on PPC_MULTIPLATFORM && PPC32
308 select PPC_INDIRECT_PCI
312 depends on PPC_MULTIPLATFORM && PPC64
313 bool " Maple 970FX Evaluation Board"
315 select MPIC_BROKEN_U3
318 This option enables support for the Maple 970FX Evaluation Board.
319 For more informations, refer to <http://www.970eval.com>
322 bool " Broadband Processor Architecture"
323 depends on PPC_MULTIPLATFORM && PPC64
328 depends on PPC_MULTIPLATFORM # for now
332 depends on PPC_PSERIES
338 depends on PPC_MULTIPLATFORM && PPC64
342 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
350 config RTAS_ERROR_LOGGING
355 config MPIC_BROKEN_U3
366 depends on PPC_PSERIES || PPC_ISERIES
374 source "drivers/cpufreq/Kconfig"
377 bool "Support for Apple PowerBooks"
378 depends on CPU_FREQ && ADB_PMU && PPC32
379 select CPU_FREQ_TABLE
381 This adds support for frequency switching on Apple PowerBooks,
382 this currently includes some models of iBook & Titanium
385 config PPC601_SYNC_FIX
386 bool "Workarounds for PPC601 bugs"
387 depends on 6xx && (PPC_PREP || PPC_PMAC)
389 Some versions of the PPC601 (the first PowerPC chip) have bugs which
390 mean that extra synchronization instructions are required near
391 certain instructions, typically those that make major changes to the
392 CPU state. These extra instructions reduce performance slightly.
393 If you say N here, these extra instructions will not be included,
394 resulting in a kernel which will run faster but may not run at all
395 on some systems with the PPC601 chip.
397 If in doubt, say Y here.
400 bool "Thermal Management Support"
403 G3 and G4 processors have an on-chip temperature sensor called the
404 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
405 temperature within 2-4 degrees Celsius. This option shows the current
406 on-die temperature in /proc/cpuinfo if the cpu supports it.
408 Unfortunately, on some chip revisions, this sensor is very inaccurate
409 and in some cases, does not work at all, so don't assume the cpu
410 temp is actually what /proc/cpuinfo says it is.
413 bool "Interrupt driven TAU driver (DANGEROUS)"
416 The TAU supports an interrupt driven mode which causes an interrupt
417 whenever the temperature goes out of range. This is the fastest way
418 to get notified the temp has exceeded a range. With this option off,
419 a timer is used to re-check the temperature periodically.
421 However, on some cpus it appears that the TAU interrupt hardware
422 is buggy and can cause a situation which would lead unexplained hard
425 Unless you are extending the TAU driver, or enjoy kernel/hardware
426 debugging, leave this option off.
429 bool "Average high and low temp"
432 The TAU hardware can compare the temperature to an upper and lower
433 bound. The default behavior is to show both the upper and lower
434 bound in /proc/cpuinfo. If the range is large, the temperature is
435 either changing a lot, or the TAU hardware is broken (likely on some
436 G4's). If the range is small (around 4 degrees), the temperature is
437 relatively stable. If you say Y here, a single temperature value,
438 halfway between the upper and lower bounds, will be reported in
441 If in doubt, say N here.
444 source arch/powerpc/platforms/embedded6xx/Kconfig
445 source arch/powerpc/platforms/4xx/Kconfig
446 source arch/powerpc/platforms/85xx/Kconfig
447 source arch/powerpc/platforms/8xx/Kconfig
449 menu "Kernel options"
452 bool "High memory support"
455 source kernel/Kconfig.hz
456 source kernel/Kconfig.preempt
457 source "fs/Kconfig.binfmt"
459 # We optimistically allocate largepages from the VM, so make the limit
460 # large enough (16MB). This badly named config option is actually
462 config FORCE_MAX_ZONEORDER
467 config MATH_EMULATION
468 bool "Math emulation"
469 depends on 4xx || 8xx || E200 || E500
471 Some PowerPC chips designed for embedded applications do not have
472 a floating-point unit and therefore do not implement the
473 floating-point instructions in the PowerPC instruction set. If you
474 say Y here, the kernel will include code to emulate a floating-point
475 unit, which will allow programs that use floating-point
479 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
480 depends on EXPERIMENTAL && PPC64
483 Cause IO segments sent to a device for DMA to be merged virtually
484 by the IOMMU when they happen to have been allocated contiguously.
485 This doesn't add pressure to the IOMMU allocator. However, some
486 drivers don't support getting large merged segments coming back
487 from *_map_sg(). Say Y if you know the drivers you are using are
488 properly handling this case.
491 bool "Support for enabling/disabling CPUs"
492 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
494 Say Y here to be able to disable and re-enable individual
495 CPUs at runtime on SMP machines.
497 Say N if you are unsure.
500 bool "kexec system call (EXPERIMENTAL)"
501 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
503 kexec is a system call that implements the ability to shutdown your
504 current kernel, and to start another kernel. It is like a reboot
505 but it is indepedent of the system firmware. And like a reboot
506 you can start any kernel with it, not just Linux.
508 The name comes from the similiarity to the exec system call.
510 It is an ongoing process to be certain the hardware in a machine
511 is properly shutdown, so do not be surprised if this code does not
512 initially work for you. It may help to enable device hotplugging
513 support. As of this writing the exact hardware interface is
514 strongly in flux, so no good recommendation can be made.
518 depends on 8xx || 8260
522 bool "PC PS/2 style Keyboard"
523 depends on 4xx || CPM2
526 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
527 default y if PPC_PREP
530 bool "Distribute interrupts on all CPUs by default"
531 depends on SMP && !MV64360
533 This option gives the kernel permission to distribute IRQs across
534 multiple CPUs. Saying N here will route all IRQs to the first
535 CPU. Generally saying Y is safe, although some problems have been
536 reported with SMP Power Macintoshes with this option enabled.
538 source "arch/powerpc/platforms/pseries/Kconfig"
540 config ARCH_SELECT_MEMORY_MODEL
544 config ARCH_FLATMEM_ENABLE
546 depends on PPC64 && !NUMA
548 config ARCH_DISCONTIGMEM_ENABLE
550 depends on SMP && PPC_PSERIES
552 config ARCH_DISCONTIGMEM_DEFAULT
554 depends on ARCH_DISCONTIGMEM_ENABLE
556 config ARCH_FLATMEM_ENABLE
560 config ARCH_SPARSEMEM_ENABLE
562 depends on ARCH_DISCONTIGMEM_ENABLE
566 config HAVE_ARCH_EARLY_PFN_TO_NID
568 depends on NEED_MULTIPLE_NODES
570 # Some NUMA nodes have memory ranges that span
571 # other nodes. Even though a pfn is valid and
572 # between a node's start and end pfns, it may not
573 # reside on that node.
575 # This is a relatively temporary hack that should
576 # be able to go away when sparsemem is fully in
579 config NODES_SPAN_OTHER_NODES
581 depends on NEED_MULTIPLE_NODES
585 default y if DISCONTIGMEM || SPARSEMEM
588 bool "SMT (Hyperthreading) scheduler support"
589 depends on PPC64 && SMP
592 SMT scheduler support improves the CPU scheduler's decision making
593 when dealing with POWER5 cpus at a cost of slightly increased
594 overhead in some places. If unsure say N here.
596 config PROC_DEVICETREE
597 bool "Support for device tree in /proc"
600 This option adds a device-tree directory under /proc which contains
601 an image of the device tree that the kernel copies from Open
602 Firmware or other boot firmware. If unsure, say Y here.
604 source "arch/powerpc/platforms/prep/Kconfig"
607 bool "Default bootloader kernel arguments"
608 depends on !PPC_ISERIES
611 string "Initial kernel command string"
612 depends on CMDLINE_BOOL
613 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
615 On some platforms, there is currently no way for the boot loader to
616 pass arguments to the kernel. For these platforms, you can supply
617 some command-line options at build time by entering them here. In
618 most cases you will need to specify the root device here.
621 source kernel/power/Kconfig
625 bool "Enable seccomp to safely compute untrusted bytecode"
629 This kernel feature is useful for number crunching applications
630 that may need to compute untrusted bytecode during their
631 execution. By using pipes or other transports made available to
632 the process as file descriptors supporting the read/write
633 syscalls, it's possible to isolate those applications in
634 their own address space using seccomp. Once seccomp is
635 enabled via /proc/<pid>/seccomp, it cannot be disabled
636 and the task is only allowed to execute a few safe syscalls
637 defined by each seccomp mode.
639 If unsure, say Y. Only embedded should say N here.
650 bool "Support for ISA-bus hardware"
651 depends on PPC_PREP || PPC_CHRP
654 Find out whether you have ISA slots on your motherboard. ISA is the
655 name of a bus system, i.e. the way the CPU talks to the other stuff
656 inside your box. If you have an Apple machine, say N here; if you
657 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
658 you have an embedded board, consult your board documentation.
660 config GENERIC_ISA_DMA
662 depends on PPC64 || POWER4 || 6xx && !CPM2
670 config PPC_INDIRECT_PCI
673 default y if 40x || 44x || 85xx || 83xx
682 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
687 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
688 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
689 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
690 default PCI_QSPAN if !4xx && !CPM2 && 8xx
692 Find out whether your system includes a PCI bus. PCI is the name of
693 a bus system, i.e. the way the CPU talks to the other stuff inside
694 your box. If you say Y here, the kernel will include drivers and
695 infrastructure code to support PCI bus devices.
702 bool " Supprt for 2nd PCI host controller"
703 depends on PCI && MPC834x
704 default y if MPC834x_SYS
708 depends on !4xx && !CPM2 && 8xx
711 Say Y here if you have a system based on a Motorola 8xx-series
712 embedded processor with a QSPAN PCI interface, otherwise say N.
716 depends on PCI && 8260
717 select PPC_INDIRECT_PCI
721 bool " Enable workaround for MPC826x erratum PCI 9"
722 depends on PCI_8260 && !ADS8272
726 prompt " IDMA channel for PCI 9 workaround"
729 config 8260_PCI9_IDMA1
732 config 8260_PCI9_IDMA2
735 config 8260_PCI9_IDMA3
738 config 8260_PCI9_IDMA4
743 source "drivers/pci/Kconfig"
745 source "drivers/pcmcia/Kconfig"
747 source "drivers/pci/hotplug/Kconfig"
751 menu "Advanced setup"
754 config ADVANCED_OPTIONS
755 bool "Prompt for advanced kernel configuration options"
757 This option will enable prompting for a variety of advanced kernel
758 configuration options. These options can cause the kernel to not
759 work if they are set incorrectly, but can be used to optimize certain
760 aspects of kernel memory management.
762 Unless you know what you are doing, say N here.
764 comment "Default settings for advanced configuration options are used"
765 depends on !ADVANCED_OPTIONS
767 config HIGHMEM_START_BOOL
768 bool "Set high memory pool address"
769 depends on ADVANCED_OPTIONS && HIGHMEM
771 This option allows you to set the base address of the kernel virtual
772 area used to map high memory pages. This can be useful in
773 optimizing the layout of kernel virtual memory.
775 Say N here unless you know what you are doing.
778 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
781 config LOWMEM_SIZE_BOOL
782 bool "Set maximum low memory"
783 depends on ADVANCED_OPTIONS
785 This option allows you to set the maximum amount of memory which
786 will be used as "low memory", that is, memory which the kernel can
787 access directly, without having to set up a kernel virtual mapping.
788 This can be useful in optimizing the layout of kernel virtual
791 Say N here unless you know what you are doing.
794 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
797 config KERNEL_START_BOOL
798 bool "Set custom kernel base address"
799 depends on ADVANCED_OPTIONS
801 This option allows you to set the kernel virtual address at which
802 the kernel will map low memory (the kernel image will be linked at
803 this address). This can be useful in optimizing the virtual memory
804 layout of the system.
806 Say N here unless you know what you are doing.
809 hex "Virtual address of kernel base" if KERNEL_START_BOOL
812 config TASK_SIZE_BOOL
813 bool "Set custom user task size"
814 depends on ADVANCED_OPTIONS
816 This option allows you to set the amount of virtual address space
817 allocated to user tasks. This can be useful in optimizing the
818 virtual memory layout of the system.
820 Say N here unless you know what you are doing.
823 hex "Size of user task space" if TASK_SIZE_BOOL
826 config CONSISTENT_START_BOOL
827 bool "Set custom consistent memory pool address"
828 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
830 This option allows you to set the base virtual address
831 of the the consistent memory pool. This pool of virtual
832 memory is used to make consistent memory allocations.
834 config CONSISTENT_START
835 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
836 default "0xff100000" if NOT_COHERENT_CACHE
838 config CONSISTENT_SIZE_BOOL
839 bool "Set custom consistent memory pool size"
840 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
842 This option allows you to set the size of the the
843 consistent memory pool. This pool of virtual memory
844 is used to make consistent memory allocations.
846 config CONSISTENT_SIZE
847 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
848 default "0x00200000" if NOT_COHERENT_CACHE
850 config BOOT_LOAD_BOOL
851 bool "Set the boot link/load address"
852 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
854 This option allows you to set the initial load address of the zImage
855 or zImage.initrd file. This can be useful if you are on a board
856 which has a small amount of memory.
858 Say N here unless you know what you are doing.
861 hex "Link/load address for booting" if BOOT_LOAD_BOOL
862 default "0x00400000" if 40x || 8xx || 8260
863 default "0x01000000" if 44x
867 bool "Pinned Kernel TLBs (860 ONLY)"
868 depends on ADVANCED_OPTIONS && 8xx
874 default "0xc000000000000000"
879 source "drivers/Kconfig"
883 # XXX source "arch/ppc/8xx_io/Kconfig"
885 # XXX source "arch/ppc/8260_io/Kconfig"
887 source "arch/powerpc/platforms/iseries/Kconfig"
891 source "arch/powerpc/oprofile/Kconfig"
893 source "arch/powerpc/Kconfig.debug"
895 source "security/Kconfig"
899 depends on COMPAT && KEYS
902 source "crypto/Kconfig"