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 " Cell Broadband Processor Architecture"
324 depends on PPC_MULTIPLATFORM && PPC64
330 depends on PPC_MULTIPLATFORM # for now
334 depends on PPC_PSERIES
340 depends on PPC_MULTIPLATFORM && PPC64
344 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
352 config RTAS_ERROR_LOGGING
358 bool "Proc interface to RTAS"
363 tristate "Firmware flash interface"
364 depends on PPC64 && RTAS_PROC
370 config MPIC_BROKEN_U3
381 depends on PPC_PSERIES || PPC_ISERIES
389 source "drivers/cpufreq/Kconfig"
392 bool "Support for Apple PowerBooks"
393 depends on CPU_FREQ && ADB_PMU && PPC32
394 select CPU_FREQ_TABLE
396 This adds support for frequency switching on Apple PowerBooks,
397 this currently includes some models of iBook & Titanium
400 config PPC601_SYNC_FIX
401 bool "Workarounds for PPC601 bugs"
402 depends on 6xx && (PPC_PREP || PPC_PMAC)
404 Some versions of the PPC601 (the first PowerPC chip) have bugs which
405 mean that extra synchronization instructions are required near
406 certain instructions, typically those that make major changes to the
407 CPU state. These extra instructions reduce performance slightly.
408 If you say N here, these extra instructions will not be included,
409 resulting in a kernel which will run faster but may not run at all
410 on some systems with the PPC601 chip.
412 If in doubt, say Y here.
415 bool "Thermal Management Support"
418 G3 and G4 processors have an on-chip temperature sensor called the
419 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
420 temperature within 2-4 degrees Celsius. This option shows the current
421 on-die temperature in /proc/cpuinfo if the cpu supports it.
423 Unfortunately, on some chip revisions, this sensor is very inaccurate
424 and in some cases, does not work at all, so don't assume the cpu
425 temp is actually what /proc/cpuinfo says it is.
428 bool "Interrupt driven TAU driver (DANGEROUS)"
431 The TAU supports an interrupt driven mode which causes an interrupt
432 whenever the temperature goes out of range. This is the fastest way
433 to get notified the temp has exceeded a range. With this option off,
434 a timer is used to re-check the temperature periodically.
436 However, on some cpus it appears that the TAU interrupt hardware
437 is buggy and can cause a situation which would lead unexplained hard
440 Unless you are extending the TAU driver, or enjoy kernel/hardware
441 debugging, leave this option off.
444 bool "Average high and low temp"
447 The TAU hardware can compare the temperature to an upper and lower
448 bound. The default behavior is to show both the upper and lower
449 bound in /proc/cpuinfo. If the range is large, the temperature is
450 either changing a lot, or the TAU hardware is broken (likely on some
451 G4's). If the range is small (around 4 degrees), the temperature is
452 relatively stable. If you say Y here, a single temperature value,
453 halfway between the upper and lower bounds, will be reported in
456 If in doubt, say N here.
459 source arch/powerpc/platforms/embedded6xx/Kconfig
460 source arch/powerpc/platforms/4xx/Kconfig
461 source arch/powerpc/platforms/85xx/Kconfig
462 source arch/powerpc/platforms/8xx/Kconfig
464 menu "Kernel options"
467 bool "High memory support"
470 source kernel/Kconfig.hz
471 source kernel/Kconfig.preempt
472 source "fs/Kconfig.binfmt"
474 # We optimistically allocate largepages from the VM, so make the limit
475 # large enough (16MB). This badly named config option is actually
477 config FORCE_MAX_ZONEORDER
482 config MATH_EMULATION
483 bool "Math emulation"
484 depends on 4xx || 8xx || E200 || E500
486 Some PowerPC chips designed for embedded applications do not have
487 a floating-point unit and therefore do not implement the
488 floating-point instructions in the PowerPC instruction set. If you
489 say Y here, the kernel will include code to emulate a floating-point
490 unit, which will allow programs that use floating-point
494 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
495 depends on EXPERIMENTAL && PPC64
498 Cause IO segments sent to a device for DMA to be merged virtually
499 by the IOMMU when they happen to have been allocated contiguously.
500 This doesn't add pressure to the IOMMU allocator. However, some
501 drivers don't support getting large merged segments coming back
502 from *_map_sg(). Say Y if you know the drivers you are using are
503 properly handling this case.
506 bool "Support for enabling/disabling CPUs"
507 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
509 Say Y here to be able to disable and re-enable individual
510 CPUs at runtime on SMP machines.
512 Say N if you are unsure.
515 bool "kexec system call (EXPERIMENTAL)"
516 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
518 kexec is a system call that implements the ability to shutdown your
519 current kernel, and to start another kernel. It is like a reboot
520 but it is indepedent of the system firmware. And like a reboot
521 you can start any kernel with it, not just Linux.
523 The name comes from the similiarity to the exec system call.
525 It is an ongoing process to be certain the hardware in a machine
526 is properly shutdown, so do not be surprised if this code does not
527 initially work for you. It may help to enable device hotplugging
528 support. As of this writing the exact hardware interface is
529 strongly in flux, so no good recommendation can be made.
533 depends on 8xx || 8260
537 bool "PC PS/2 style Keyboard"
538 depends on 4xx || CPM2
541 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
542 default y if PPC_PREP
545 bool "Distribute interrupts on all CPUs by default"
546 depends on SMP && !MV64360
548 This option gives the kernel permission to distribute IRQs across
549 multiple CPUs. Saying N here will route all IRQs to the first
550 CPU. Generally saying Y is safe, although some problems have been
551 reported with SMP Power Macintoshes with this option enabled.
553 source "arch/powerpc/platforms/pseries/Kconfig"
558 default y if SMP && PPC_PSERIES
560 config ARCH_SELECT_MEMORY_MODEL
564 config ARCH_FLATMEM_ENABLE
566 depends on PPC64 && !NUMA
568 config ARCH_DISCONTIGMEM_ENABLE
570 depends on SMP && PPC_PSERIES
572 config ARCH_DISCONTIGMEM_DEFAULT
574 depends on ARCH_DISCONTIGMEM_ENABLE
576 config ARCH_SPARSEMEM_ENABLE
578 depends on ARCH_DISCONTIGMEM_ENABLE
582 config HAVE_ARCH_EARLY_PFN_TO_NID
584 depends on NEED_MULTIPLE_NODES
586 # Some NUMA nodes have memory ranges that span
587 # other nodes. Even though a pfn is valid and
588 # between a node's start and end pfns, it may not
589 # reside on that node.
591 # This is a relatively temporary hack that should
592 # be able to go away when sparsemem is fully in
595 config NODES_SPAN_OTHER_NODES
597 depends on NEED_MULTIPLE_NODES
600 bool "SMT (Hyperthreading) scheduler support"
601 depends on PPC64 && SMP
604 SMT scheduler support improves the CPU scheduler's decision making
605 when dealing with POWER5 cpus at a cost of slightly increased
606 overhead in some places. If unsure say N here.
608 config PROC_DEVICETREE
609 bool "Support for device tree in /proc"
612 This option adds a device-tree directory under /proc which contains
613 an image of the device tree that the kernel copies from Open
614 Firmware or other boot firmware. If unsure, say Y here.
616 source "arch/powerpc/platforms/prep/Kconfig"
619 bool "Default bootloader kernel arguments"
620 depends on !PPC_ISERIES
623 string "Initial kernel command string"
624 depends on CMDLINE_BOOL
625 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
627 On some platforms, there is currently no way for the boot loader to
628 pass arguments to the kernel. For these platforms, you can supply
629 some command-line options at build time by entering them here. In
630 most cases you will need to specify the root device here.
633 source kernel/power/Kconfig
637 bool "Enable seccomp to safely compute untrusted bytecode"
641 This kernel feature is useful for number crunching applications
642 that may need to compute untrusted bytecode during their
643 execution. By using pipes or other transports made available to
644 the process as file descriptors supporting the read/write
645 syscalls, it's possible to isolate those applications in
646 their own address space using seccomp. Once seccomp is
647 enabled via /proc/<pid>/seccomp, it cannot be disabled
648 and the task is only allowed to execute a few safe syscalls
649 defined by each seccomp mode.
651 If unsure, say Y. Only embedded should say N here.
662 bool "Support for ISA-bus hardware"
663 depends on PPC_PREP || PPC_CHRP
666 Find out whether you have ISA slots on your motherboard. ISA is the
667 name of a bus system, i.e. the way the CPU talks to the other stuff
668 inside your box. If you have an Apple machine, say N here; if you
669 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
670 you have an embedded board, consult your board documentation.
672 config GENERIC_ISA_DMA
674 depends on PPC64 || POWER4 || 6xx && !CPM2
682 config PPC_INDIRECT_PCI
685 default y if 40x || 44x || 85xx || 83xx
694 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
699 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
700 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
701 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
702 default PCI_QSPAN if !4xx && !CPM2 && 8xx
704 Find out whether your system includes a PCI bus. PCI is the name of
705 a bus system, i.e. the way the CPU talks to the other stuff inside
706 your box. If you say Y here, the kernel will include drivers and
707 infrastructure code to support PCI bus devices.
714 bool " Supprt for 2nd PCI host controller"
715 depends on PCI && MPC834x
716 default y if MPC834x_SYS
720 depends on !4xx && !CPM2 && 8xx
723 Say Y here if you have a system based on a Motorola 8xx-series
724 embedded processor with a QSPAN PCI interface, otherwise say N.
728 depends on PCI && 8260
729 select PPC_INDIRECT_PCI
733 bool " Enable workaround for MPC826x erratum PCI 9"
734 depends on PCI_8260 && !ADS8272
738 prompt " IDMA channel for PCI 9 workaround"
741 config 8260_PCI9_IDMA1
744 config 8260_PCI9_IDMA2
747 config 8260_PCI9_IDMA3
750 config 8260_PCI9_IDMA4
755 source "drivers/pci/Kconfig"
757 source "drivers/pcmcia/Kconfig"
759 source "drivers/pci/hotplug/Kconfig"
763 menu "Advanced setup"
766 config ADVANCED_OPTIONS
767 bool "Prompt for advanced kernel configuration options"
769 This option will enable prompting for a variety of advanced kernel
770 configuration options. These options can cause the kernel to not
771 work if they are set incorrectly, but can be used to optimize certain
772 aspects of kernel memory management.
774 Unless you know what you are doing, say N here.
776 comment "Default settings for advanced configuration options are used"
777 depends on !ADVANCED_OPTIONS
779 config HIGHMEM_START_BOOL
780 bool "Set high memory pool address"
781 depends on ADVANCED_OPTIONS && HIGHMEM
783 This option allows you to set the base address of the kernel virtual
784 area used to map high memory pages. This can be useful in
785 optimizing the layout of kernel virtual memory.
787 Say N here unless you know what you are doing.
790 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
793 config LOWMEM_SIZE_BOOL
794 bool "Set maximum low memory"
795 depends on ADVANCED_OPTIONS
797 This option allows you to set the maximum amount of memory which
798 will be used as "low memory", that is, memory which the kernel can
799 access directly, without having to set up a kernel virtual mapping.
800 This can be useful in optimizing the layout of kernel virtual
803 Say N here unless you know what you are doing.
806 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
809 config KERNEL_START_BOOL
810 bool "Set custom kernel base address"
811 depends on ADVANCED_OPTIONS
813 This option allows you to set the kernel virtual address at which
814 the kernel will map low memory (the kernel image will be linked at
815 this address). This can be useful in optimizing the virtual memory
816 layout of the system.
818 Say N here unless you know what you are doing.
821 hex "Virtual address of kernel base" if KERNEL_START_BOOL
824 config TASK_SIZE_BOOL
825 bool "Set custom user task size"
826 depends on ADVANCED_OPTIONS
828 This option allows you to set the amount of virtual address space
829 allocated to user tasks. This can be useful in optimizing the
830 virtual memory layout of the system.
832 Say N here unless you know what you are doing.
835 hex "Size of user task space" if TASK_SIZE_BOOL
838 config CONSISTENT_START_BOOL
839 bool "Set custom consistent memory pool address"
840 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
842 This option allows you to set the base virtual address
843 of the the consistent memory pool. This pool of virtual
844 memory is used to make consistent memory allocations.
846 config CONSISTENT_START
847 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
848 default "0xff100000" if NOT_COHERENT_CACHE
850 config CONSISTENT_SIZE_BOOL
851 bool "Set custom consistent memory pool size"
852 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
854 This option allows you to set the size of the the
855 consistent memory pool. This pool of virtual memory
856 is used to make consistent memory allocations.
858 config CONSISTENT_SIZE
859 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
860 default "0x00200000" if NOT_COHERENT_CACHE
862 config BOOT_LOAD_BOOL
863 bool "Set the boot link/load address"
864 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
866 This option allows you to set the initial load address of the zImage
867 or zImage.initrd file. This can be useful if you are on a board
868 which has a small amount of memory.
870 Say N here unless you know what you are doing.
873 hex "Link/load address for booting" if BOOT_LOAD_BOOL
874 default "0x00400000" if 40x || 8xx || 8260
875 default "0x01000000" if 44x
879 bool "Pinned Kernel TLBs (860 ONLY)"
880 depends on ADVANCED_OPTIONS && 8xx
886 default "0xc000000000000000"
891 source "drivers/Kconfig"
895 # XXX source "arch/ppc/8xx_io/Kconfig"
897 # XXX source "arch/ppc/8260_io/Kconfig"
899 source "arch/powerpc/platforms/iseries/Kconfig"
903 source "arch/powerpc/oprofile/Kconfig"
905 source "arch/powerpc/Kconfig.debug"
907 source "security/Kconfig"
911 depends on COMPAT && KEYS
914 source "crypto/Kconfig"