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
29 config GENERIC_HARDIRQS
33 config RWSEM_GENERIC_SPINLOCK
36 config RWSEM_XCHGADD_ALGORITHM
40 config GENERIC_CALIBRATE_DELAY
58 depends on COMPAT && SYSVIPC
61 # All PPC32s use generic nvram driver through ppc_md
66 config SCHED_NO_NO_OMIT_FRAME_POINTER
70 config ARCH_MAY_HAVE_PC_FDC
83 default y if PPC32 && SMP
89 Used to allow a board to specify it wants a uImage built by default
92 menu "Processor support"
94 prompt "Processor Type"
103 There are four families of PowerPC chips supported. The more common
104 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
105 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
106 embedded versions (403 and 405) and the high end 64 bit Power
107 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
109 Unless you are building a kernel for one of the embedded processor
110 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
111 Note that the kernel runs in 32-bit mode even on 64-bit chips.
114 bool "Freescale 52xx"
119 bool "Freescale 82xx"
124 bool "Freescale 83xx"
131 bool "Freescale 85xx"
146 bool "Freescale e200"
151 bool "Optimize for POWER4"
155 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
156 The resulting binary will not work on POWER3 or RS64 processors
157 when compiled with binutils 2.15 or later.
162 default y if !POWER4_ONLY
171 # this is temp to handle compat with arch=ppc
175 # this is temp to handle compat with arch=ppc
188 depends on E200 || E500
193 depends on E200 || E500
198 depends on 44x || E500
200 default y if E500 && PHYS_64BIT
203 bool 'Large physical address support' if E500
204 depends on 44x || E500
207 This option enables kernel support for larger than 32-bit physical
208 addresses. This features is not be available on all e500 cores.
210 If in doubt, say N here.
213 bool "AltiVec Support"
214 depends on CLASSIC32 || POWER4
216 This option enables kernel support for the Altivec extensions to the
217 PowerPC processor. The kernel currently supports saving and restoring
218 altivec registers, and turning on the 'altivec enable' bit so user
219 processes can execute altivec instructions.
221 This option is only usefully if you have a processor that supports
222 altivec (G4, otherwise known as 74xx series), but does not have
223 any affect on a non-altivec cpu (it does, however add code to the
226 If in doubt, say Y here.
230 depends on E200 || E500
233 This option enables kernel support for the Signal Processing
234 Extensions (SPE) to the PowerPC processor. The kernel currently
235 supports saving and restoring SPE registers, and turning on the
236 'spe enable' bit so user processes can execute SPE instructions.
238 This option is only useful if you have a processor that supports
239 SPE (e500, otherwise known as 85xx series), but does not have any
240 effect on a non-spe cpu (it does, however add code to the kernel).
242 If in doubt, say Y here.
246 depends on 6xx || POWER3 || POWER4 || PPC64
249 config PPC_STD_MMU_32
251 depends on PPC_STD_MMU && PPC32
253 config VIRT_CPU_ACCOUNTING
254 bool "Deterministic task and CPU time accounting"
258 Select this option to enable more accurate task and CPU time
259 accounting. This is done by reading a CPU counter on each
260 kernel entry and exit and on transitions within the kernel
261 between system, softirq and hardirq state, so there is a
262 small performance impact. This also enables accounting of
263 stolen time on logically-partitioned systems running on
264 IBM POWER5-based machines.
266 If in doubt, say Y here.
269 depends on PPC_STD_MMU
270 bool "Symmetric multi-processing support"
272 This enables support for systems with more than one CPU. If you have
273 a system with only one CPU, say N. If you have a system with more
274 than one CPU, say Y. Note that the kernel does not currently
275 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
276 since they have inadequate hardware support for multiprocessor
279 If you say N here, the kernel will run on single and multiprocessor
280 machines, but will use only one CPU of a multiprocessor machine. If
281 you say Y here, the kernel will run on single-processor machines.
282 On a single-processor machine, the kernel will run faster if you say
285 If you don't know what to do here, say N.
288 int "Maximum number of CPUs (2-128)"
291 default "32" if PPC64
294 config NOT_COHERENT_CACHE
296 depends on 4xx || 8xx || E200
300 source "init/Kconfig"
302 menu "Platform support"
303 depends on PPC64 || CLASSIC32
306 prompt "Machine type"
307 default PPC_MULTIPLATFORM
309 config PPC_MULTIPLATFORM
310 bool "Generic desktop/server/laptop"
312 Select this option if configuring for an IBM pSeries or
313 RS/6000 machine, an Apple machine, or a PReP, CHRP,
314 Maple or Cell-based machine.
317 bool "IBM Legacy iSeries"
321 bool "Embedded 6xx/7xx/7xxx-based board"
322 depends on PPC32 && BROKEN
326 depends on PPC32 && BROKEN
328 Select APUS if configuring for a PowerUP Amiga.
329 More information is available at:
330 <http://linux-apus.sourceforge.net/>.
334 depends on PPC_MULTIPLATFORM && PPC64
335 bool " IBM pSeries & new (POWER5-based) iSeries"
338 select RTAS_ERROR_LOGGING
339 select PPC_UDBG_16550
343 bool " Common Hardware Reference Platform (CHRP) based machines"
344 depends on PPC_MULTIPLATFORM && PPC32
346 select PPC_INDIRECT_PCI
349 select PPC_UDBG_16550
353 bool " Apple PowerMac based machines"
354 depends on PPC_MULTIPLATFORM
355 select PPC_INDIRECT_PCI if PPC32
356 select PPC_MPC106 if PPC32
361 depends on PPC_PMAC && POWER4
363 select MPIC_BROKEN_U3
364 select GENERIC_TBSYNC
368 bool " PowerPC Reference Platform (PReP) based machines"
369 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
371 select PPC_INDIRECT_PCI
372 select PPC_UDBG_16550
376 depends on PPC_MULTIPLATFORM && PPC64
377 bool " Maple 970FX Evaluation Board"
379 select MPIC_BROKEN_U3
380 select GENERIC_TBSYNC
381 select PPC_UDBG_16550
384 This option enables support for the Maple 970FX Evaluation Board.
385 For more informations, refer to <http://www.970eval.com>
388 bool " Cell Broadband Processor Architecture"
389 depends on PPC_MULTIPLATFORM && PPC64
392 select PPC_UDBG_16550
395 depends on PPC_PSERIES
401 depends on PPC_MULTIPLATFORM && PPC64
405 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
413 config RTAS_ERROR_LOGGING
419 bool "Proc interface to RTAS"
424 tristate "Firmware flash interface"
425 depends on PPC64 && RTAS_PROC
431 config MPIC_BROKEN_U3
442 depends on PPC_PSERIES || PPC_ISERIES
447 depends on PPC_PSERIES
448 bool "Support for GX bus based adapters"
450 Bus device driver for GX bus based adapters.
456 source "drivers/cpufreq/Kconfig"
459 bool "Support for Apple PowerBooks"
460 depends on CPU_FREQ && ADB_PMU && PPC32
461 select CPU_FREQ_TABLE
463 This adds support for frequency switching on Apple PowerBooks,
464 this currently includes some models of iBook & Titanium
467 config CPU_FREQ_PMAC64
468 bool "Support for some Apple G5s"
469 depends on CPU_FREQ && PMAC_SMU && PPC64
470 select CPU_FREQ_TABLE
472 This adds support for frequency switching on Apple iMac G5,
473 and some of the more recent desktop G5 machines as well.
475 config PPC601_SYNC_FIX
476 bool "Workarounds for PPC601 bugs"
477 depends on 6xx && (PPC_PREP || PPC_PMAC)
479 Some versions of the PPC601 (the first PowerPC chip) have bugs which
480 mean that extra synchronization instructions are required near
481 certain instructions, typically those that make major changes to the
482 CPU state. These extra instructions reduce performance slightly.
483 If you say N here, these extra instructions will not be included,
484 resulting in a kernel which will run faster but may not run at all
485 on some systems with the PPC601 chip.
487 If in doubt, say Y here.
490 bool "Thermal Management Support"
493 G3 and G4 processors have an on-chip temperature sensor called the
494 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
495 temperature within 2-4 degrees Celsius. This option shows the current
496 on-die temperature in /proc/cpuinfo if the cpu supports it.
498 Unfortunately, on some chip revisions, this sensor is very inaccurate
499 and in some cases, does not work at all, so don't assume the cpu
500 temp is actually what /proc/cpuinfo says it is.
503 bool "Interrupt driven TAU driver (DANGEROUS)"
506 The TAU supports an interrupt driven mode which causes an interrupt
507 whenever the temperature goes out of range. This is the fastest way
508 to get notified the temp has exceeded a range. With this option off,
509 a timer is used to re-check the temperature periodically.
511 However, on some cpus it appears that the TAU interrupt hardware
512 is buggy and can cause a situation which would lead unexplained hard
515 Unless you are extending the TAU driver, or enjoy kernel/hardware
516 debugging, leave this option off.
519 bool "Average high and low temp"
522 The TAU hardware can compare the temperature to an upper and lower
523 bound. The default behavior is to show both the upper and lower
524 bound in /proc/cpuinfo. If the range is large, the temperature is
525 either changing a lot, or the TAU hardware is broken (likely on some
526 G4's). If the range is small (around 4 degrees), the temperature is
527 relatively stable. If you say Y here, a single temperature value,
528 halfway between the upper and lower bounds, will be reported in
531 If in doubt, say N here.
534 source arch/powerpc/platforms/embedded6xx/Kconfig
535 source arch/powerpc/platforms/4xx/Kconfig
536 source arch/powerpc/platforms/83xx/Kconfig
537 source arch/powerpc/platforms/85xx/Kconfig
538 source arch/powerpc/platforms/8xx/Kconfig
539 source arch/powerpc/platforms/cell/Kconfig
541 menu "Kernel options"
544 bool "High memory support"
547 source kernel/Kconfig.hz
548 source kernel/Kconfig.preempt
549 source "fs/Kconfig.binfmt"
551 # We optimistically allocate largepages from the VM, so make the limit
552 # large enough (16MB). This badly named config option is actually
554 config FORCE_MAX_ZONEORDER
557 default "9" if PPC_64K_PAGES
560 config MATH_EMULATION
561 bool "Math emulation"
562 depends on 4xx || 8xx || E200 || E500
564 Some PowerPC chips designed for embedded applications do not have
565 a floating-point unit and therefore do not implement the
566 floating-point instructions in the PowerPC instruction set. If you
567 say Y here, the kernel will include code to emulate a floating-point
568 unit, which will allow programs that use floating-point
572 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
573 depends on EXPERIMENTAL && PPC64
576 Cause IO segments sent to a device for DMA to be merged virtually
577 by the IOMMU when they happen to have been allocated contiguously.
578 This doesn't add pressure to the IOMMU allocator. However, some
579 drivers don't support getting large merged segments coming back
580 from *_map_sg(). Say Y if you know the drivers you are using are
581 properly handling this case.
584 bool "Support for enabling/disabling CPUs"
585 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
587 Say Y here to be able to disable and re-enable individual
588 CPUs at runtime on SMP machines.
590 Say N if you are unsure.
593 bool "kexec system call (EXPERIMENTAL)"
594 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
596 kexec is a system call that implements the ability to shutdown your
597 current kernel, and to start another kernel. It is like a reboot
598 but it is indepedent of the system firmware. And like a reboot
599 you can start any kernel with it, not just Linux.
601 The name comes from the similiarity to the exec system call.
603 It is an ongoing process to be certain the hardware in a machine
604 is properly shutdown, so do not be surprised if this code does not
605 initially work for you. It may help to enable device hotplugging
606 support. As of this writing the exact hardware interface is
607 strongly in flux, so no good recommendation can be made.
610 bool "Build a kdump crash kernel (EXPERIMENTAL)"
611 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
613 Build a kernel suitable for use as a kdump capture kernel.
614 The kernel will be linked at a different address than normal, and
615 so can only be used for Kdump.
617 Don't change this unless you know what you are doing.
621 depends on 8xx || 8260
625 bool "PC PS/2 style Keyboard"
626 depends on 4xx || CPM2
629 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
630 default y if PPC_PREP
633 bool "Distribute interrupts on all CPUs by default"
634 depends on SMP && !MV64360
636 This option gives the kernel permission to distribute IRQs across
637 multiple CPUs. Saying N here will route all IRQs to the first
638 CPU. Generally saying Y is safe, although some problems have been
639 reported with SMP Power Macintoshes with this option enabled.
641 source "arch/powerpc/platforms/pseries/Kconfig"
646 default y if SMP && PPC_PSERIES
648 config ARCH_SELECT_MEMORY_MODEL
652 config ARCH_FLATMEM_ENABLE
654 depends on (PPC64 && !NUMA) || PPC32
656 config ARCH_SPARSEMEM_ENABLE
660 config ARCH_SPARSEMEM_DEFAULT
662 depends on SMP && PPC_PSERIES
666 config HAVE_ARCH_EARLY_PFN_TO_NID
668 depends on NEED_MULTIPLE_NODES
670 config ARCH_MEMORY_PROBE
672 depends on MEMORY_HOTPLUG
678 This option changes the kernel logical page size to 64k. On machines
679 without processor support for 64k pages, the kernel will simulate
680 them by loading each individual 4k page on demand transparently,
681 while on hardware with such support, it will be used to map
682 normal application pages.
685 bool "SMT (Hyperthreading) scheduler support"
686 depends on PPC64 && SMP
689 SMT scheduler support improves the CPU scheduler's decision making
690 when dealing with POWER5 cpus at a cost of slightly increased
691 overhead in some places. If unsure say N here.
693 config PROC_DEVICETREE
694 bool "Support for device tree in /proc"
697 This option adds a device-tree directory under /proc which contains
698 an image of the device tree that the kernel copies from Open
699 Firmware or other boot firmware. If unsure, say Y here.
701 source "arch/powerpc/platforms/prep/Kconfig"
704 bool "Default bootloader kernel arguments"
705 depends on !PPC_ISERIES
708 string "Initial kernel command string"
709 depends on CMDLINE_BOOL
710 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
712 On some platforms, there is currently no way for the boot loader to
713 pass arguments to the kernel. For these platforms, you can supply
714 some command-line options at build time by entering them here. In
715 most cases you will need to specify the root device here.
718 source kernel/power/Kconfig
722 bool "Enable seccomp to safely compute untrusted bytecode"
726 This kernel feature is useful for number crunching applications
727 that may need to compute untrusted bytecode during their
728 execution. By using pipes or other transports made available to
729 the process as file descriptors supporting the read/write
730 syscalls, it's possible to isolate those applications in
731 their own address space using seccomp. Once seccomp is
732 enabled via /proc/<pid>/seccomp, it cannot be disabled
733 and the task is only allowed to execute a few safe syscalls
734 defined by each seccomp mode.
736 If unsure, say Y. Only embedded should say N here.
747 bool "Support for ISA-bus hardware"
748 depends on PPC_PREP || PPC_CHRP
751 Find out whether you have ISA slots on your motherboard. ISA is the
752 name of a bus system, i.e. the way the CPU talks to the other stuff
753 inside your box. If you have an Apple machine, say N here; if you
754 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
755 you have an embedded board, consult your board documentation.
757 config GENERIC_ISA_DMA
759 depends on PPC64 || POWER4 || 6xx && !CPM2
766 config PPC_INDIRECT_PCI
769 default y if 40x || 44x
781 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
786 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
787 default y if !40x && !CPM2 && !8xx && !APUS && !PPC_83xx && !PPC_85xx
788 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
789 default PCI_QSPAN if !4xx && !CPM2 && 8xx
791 Find out whether your system includes a PCI bus. PCI is the name of
792 a bus system, i.e. the way the CPU talks to the other stuff inside
793 your box. If you say Y here, the kernel will include drivers and
794 infrastructure code to support PCI bus devices.
802 depends on !4xx && !CPM2 && 8xx
805 Say Y here if you have a system based on a Motorola 8xx-series
806 embedded processor with a QSPAN PCI interface, otherwise say N.
810 depends on PCI && 8260
811 select PPC_INDIRECT_PCI
815 bool " Enable workaround for MPC826x erratum PCI 9"
816 depends on PCI_8260 && !ADS8272
820 prompt " IDMA channel for PCI 9 workaround"
823 config 8260_PCI9_IDMA1
826 config 8260_PCI9_IDMA2
829 config 8260_PCI9_IDMA3
832 config 8260_PCI9_IDMA4
837 source "drivers/pci/Kconfig"
839 source "drivers/pcmcia/Kconfig"
841 source "drivers/pci/hotplug/Kconfig"
845 menu "Advanced setup"
848 config ADVANCED_OPTIONS
849 bool "Prompt for advanced kernel configuration options"
851 This option will enable prompting for a variety of advanced kernel
852 configuration options. These options can cause the kernel to not
853 work if they are set incorrectly, but can be used to optimize certain
854 aspects of kernel memory management.
856 Unless you know what you are doing, say N here.
858 comment "Default settings for advanced configuration options are used"
859 depends on !ADVANCED_OPTIONS
861 config HIGHMEM_START_BOOL
862 bool "Set high memory pool address"
863 depends on ADVANCED_OPTIONS && HIGHMEM
865 This option allows you to set the base address of the kernel virtual
866 area used to map high memory pages. This can be useful in
867 optimizing the layout of kernel virtual memory.
869 Say N here unless you know what you are doing.
872 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
875 config LOWMEM_SIZE_BOOL
876 bool "Set maximum low memory"
877 depends on ADVANCED_OPTIONS
879 This option allows you to set the maximum amount of memory which
880 will be used as "low memory", that is, memory which the kernel can
881 access directly, without having to set up a kernel virtual mapping.
882 This can be useful in optimizing the layout of kernel virtual
885 Say N here unless you know what you are doing.
888 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
891 config KERNEL_START_BOOL
892 bool "Set custom kernel base address"
893 depends on ADVANCED_OPTIONS
895 This option allows you to set the kernel virtual address at which
896 the kernel will map low memory (the kernel image will be linked at
897 this address). This can be useful in optimizing the virtual memory
898 layout of the system.
900 Say N here unless you know what you are doing.
903 hex "Virtual address of kernel base" if KERNEL_START_BOOL
906 config TASK_SIZE_BOOL
907 bool "Set custom user task size"
908 depends on ADVANCED_OPTIONS
910 This option allows you to set the amount of virtual address space
911 allocated to user tasks. This can be useful in optimizing the
912 virtual memory layout of the system.
914 Say N here unless you know what you are doing.
917 hex "Size of user task space" if TASK_SIZE_BOOL
920 config CONSISTENT_START_BOOL
921 bool "Set custom consistent memory pool address"
922 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
924 This option allows you to set the base virtual address
925 of the the consistent memory pool. This pool of virtual
926 memory is used to make consistent memory allocations.
928 config CONSISTENT_START
929 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
930 default "0xff100000" if NOT_COHERENT_CACHE
932 config CONSISTENT_SIZE_BOOL
933 bool "Set custom consistent memory pool size"
934 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
936 This option allows you to set the size of the the
937 consistent memory pool. This pool of virtual memory
938 is used to make consistent memory allocations.
940 config CONSISTENT_SIZE
941 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
942 default "0x00200000" if NOT_COHERENT_CACHE
944 config BOOT_LOAD_BOOL
945 bool "Set the boot link/load address"
946 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
948 This option allows you to set the initial load address of the zImage
949 or zImage.initrd file. This can be useful if you are on a board
950 which has a small amount of memory.
952 Say N here unless you know what you are doing.
955 hex "Link/load address for booting" if BOOT_LOAD_BOOL
956 default "0x00400000" if 40x || 8xx || 8260
957 default "0x01000000" if 44x
961 bool "Pinned Kernel TLBs (860 ONLY)"
962 depends on ADVANCED_OPTIONS && 8xx
968 default "0xc000000000000000"
973 source "drivers/Kconfig"
977 # XXX source "arch/ppc/8xx_io/Kconfig"
979 # XXX source "arch/ppc/8260_io/Kconfig"
981 source "arch/powerpc/platforms/iseries/Kconfig"
985 menu "Instrumentation Support"
986 depends on EXPERIMENTAL
988 source "arch/powerpc/oprofile/Kconfig"
991 bool "Kprobes (EXPERIMENTAL)"
992 depends on PPC64 && EXPERIMENTAL && MODULES
994 Kprobes allows you to trap at almost any kernel address and
995 execute a callback function. register_kprobe() establishes
996 a probepoint and specifies the callback. Kprobes is useful
997 for kernel debugging, non-intrusive instrumentation and testing.
998 If in doubt, say "N".
1001 source "arch/powerpc/Kconfig.debug"
1003 source "security/Kconfig"
1007 depends on COMPAT && KEYS
1010 source "crypto/Kconfig"