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
74 menu "Processor support"
76 prompt "Processor Type"
84 There are four families of PowerPC chips supported. The more common
85 types (601, 603, 604, 740, 750, 7400), the Motorola embedded
86 versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
87 embedded versions (403 and 405) and the high end 64 bit Power
88 processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
90 Unless you are building a kernel for one of the embedded processor
91 systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
92 Note that the kernel runs in 32-bit mode even on 64-bit chips.
101 bool "Freescale 83xx"
113 bool "Freescale e200"
116 bool "Freescale e500"
120 bool "Optimize for POWER4"
124 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
125 The resulting binary will not work on POWER3 or RS64 processors
126 when compiled with binutils 2.15 or later.
131 default y if !POWER4_ONLY
143 depends on E200 || E500
148 depends on E200 || E500
153 depends on 44x || E500
155 default y if E500 && PHYS_64BIT
158 bool 'Large physical address support' if E500
159 depends on 44x || E500
162 This option enables kernel support for larger than 32-bit physical
163 addresses. This features is not be available on all e500 cores.
165 If in doubt, say N here.
168 bool "AltiVec Support"
169 depends on 6xx || POWER4
171 This option enables kernel support for the Altivec extensions to the
172 PowerPC processor. The kernel currently supports saving and restoring
173 altivec registers, and turning on the 'altivec enable' bit so user
174 processes can execute altivec instructions.
176 This option is only usefully if you have a processor that supports
177 altivec (G4, otherwise known as 74xx series), but does not have
178 any affect on a non-altivec cpu (it does, however add code to the
181 If in doubt, say Y here.
185 depends on E200 || E500
187 This option enables kernel support for the Signal Processing
188 Extensions (SPE) to the PowerPC processor. The kernel currently
189 supports saving and restoring SPE registers, and turning on the
190 'spe enable' bit so user processes can execute SPE instructions.
192 This option is only useful if you have a processor that supports
193 SPE (e500, otherwise known as 85xx series), but does not have any
194 effect on a non-spe cpu (it does, however add code to the kernel).
196 If in doubt, say Y here.
200 depends on 6xx || POWER3 || POWER4 || PPC64
203 config PPC_STD_MMU_32
205 depends on PPC_STD_MMU && PPC32
208 depends on PPC_STD_MMU
209 bool "Symmetric multi-processing support"
211 This enables support for systems with more than one CPU. If you have
212 a system with only one CPU, say N. If you have a system with more
213 than one CPU, say Y. Note that the kernel does not currently
214 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
215 since they have inadequate hardware support for multiprocessor
218 If you say N here, the kernel will run on single and multiprocessor
219 machines, but will use only one CPU of a multiprocessor machine. If
220 you say Y here, the kernel will run on single-processor machines.
221 On a single-processor machine, the kernel will run faster if you say
224 If you don't know what to do here, say N.
227 int "Maximum number of CPUs (2-128)"
230 default "32" if PPC64
233 config NOT_COHERENT_CACHE
235 depends on 4xx || 8xx || E200
239 source "init/Kconfig"
241 menu "Platform support"
242 depends on PPC64 || 6xx
245 prompt "Machine type"
246 default PPC_MULTIPLATFORM
248 config PPC_MULTIPLATFORM
249 bool "Generic desktop/server/laptop"
251 Select this option if configuring for an IBM pSeries or
252 RS/6000 machine, an Apple machine, or a PReP, CHRP,
253 Maple or Cell-based machine.
256 bool "IBM Legacy iSeries"
260 bool "Embedded 6xx/7xx/7xxx-based board"
261 depends on PPC32 && BROKEN
265 depends on PPC32 && BROKEN
267 Select APUS if configuring for a PowerUP Amiga.
268 More information is available at:
269 <http://linux-apus.sourceforge.net/>.
273 depends on PPC_MULTIPLATFORM && PPC64
274 bool " IBM pSeries & new (POWER5-based) iSeries"
277 select RTAS_ERROR_LOGGING
278 select PPC_UDBG_16550
282 bool " Common Hardware Reference Platform (CHRP) based machines"
283 depends on PPC_MULTIPLATFORM && PPC32
285 select PPC_INDIRECT_PCI
288 select PPC_UDBG_16550
292 bool " Apple PowerMac based machines"
293 depends on PPC_MULTIPLATFORM
294 select PPC_INDIRECT_PCI if PPC32
295 select PPC_MPC106 if PPC32
300 depends on PPC_PMAC && POWER4
302 select MPIC_BROKEN_U3
303 select GENERIC_TBSYNC
307 bool " PowerPC Reference Platform (PReP) based machines"
308 depends on PPC_MULTIPLATFORM && PPC32 && BROKEN
310 select PPC_INDIRECT_PCI
311 select PPC_UDBG_16550
315 depends on PPC_MULTIPLATFORM && PPC64
316 bool " Maple 970FX Evaluation Board"
318 select MPIC_BROKEN_U3
319 select GENERIC_TBSYNC
320 select PPC_UDBG_16550
323 This option enables support for the Maple 970FX Evaluation Board.
324 For more informations, refer to <http://www.970eval.com>
327 bool " Cell Broadband Processor Architecture"
328 depends on PPC_MULTIPLATFORM && PPC64
331 select PPC_UDBG_16550
337 depends on PPC_PSERIES
343 depends on PPC_MULTIPLATFORM && PPC64
347 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE || PPC_CHRP
355 config RTAS_ERROR_LOGGING
361 bool "Proc interface to RTAS"
366 tristate "Firmware flash interface"
367 depends on PPC64 && RTAS_PROC
373 config MPIC_BROKEN_U3
378 config PPC_UDBG_16550
388 bool "kernel crash dumps (EXPERIMENTAL)"
389 depends on PPC_MULTIPLATFORM
390 depends on EXPERIMENTAL
392 Build a kernel suitable for use as a kdump capture kernel.
393 The kernel will be linked at a different address than normal, and
394 so can only be used for Kdump.
396 Don't change this unless you know what you are doing.
399 depends on PPC_PSERIES || PPC_ISERIES
404 depends on PPC_PSERIES
405 bool "Support for GX bus based adapters"
407 Bus device driver for GX bus based adapters.
413 config GENERIC_TBSYNC
415 default y if PPC32 && SMP
418 source "drivers/cpufreq/Kconfig"
421 bool "Support for Apple PowerBooks"
422 depends on CPU_FREQ && ADB_PMU && PPC32
423 select CPU_FREQ_TABLE
425 This adds support for frequency switching on Apple PowerBooks,
426 this currently includes some models of iBook & Titanium
429 config CPU_FREQ_PMAC64
430 bool "Support for some Apple G5s"
431 depends on CPU_FREQ && PMAC_SMU && PPC64
432 select CPU_FREQ_TABLE
434 This adds support for frequency switching on Apple iMac G5,
435 and some of the more recent desktop G5 machines as well.
437 config PPC601_SYNC_FIX
438 bool "Workarounds for PPC601 bugs"
439 depends on 6xx && (PPC_PREP || PPC_PMAC)
441 Some versions of the PPC601 (the first PowerPC chip) have bugs which
442 mean that extra synchronization instructions are required near
443 certain instructions, typically those that make major changes to the
444 CPU state. These extra instructions reduce performance slightly.
445 If you say N here, these extra instructions will not be included,
446 resulting in a kernel which will run faster but may not run at all
447 on some systems with the PPC601 chip.
449 If in doubt, say Y here.
452 bool "Thermal Management Support"
455 G3 and G4 processors have an on-chip temperature sensor called the
456 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
457 temperature within 2-4 degrees Celsius. This option shows the current
458 on-die temperature in /proc/cpuinfo if the cpu supports it.
460 Unfortunately, on some chip revisions, this sensor is very inaccurate
461 and in some cases, does not work at all, so don't assume the cpu
462 temp is actually what /proc/cpuinfo says it is.
465 bool "Interrupt driven TAU driver (DANGEROUS)"
468 The TAU supports an interrupt driven mode which causes an interrupt
469 whenever the temperature goes out of range. This is the fastest way
470 to get notified the temp has exceeded a range. With this option off,
471 a timer is used to re-check the temperature periodically.
473 However, on some cpus it appears that the TAU interrupt hardware
474 is buggy and can cause a situation which would lead unexplained hard
477 Unless you are extending the TAU driver, or enjoy kernel/hardware
478 debugging, leave this option off.
481 bool "Average high and low temp"
484 The TAU hardware can compare the temperature to an upper and lower
485 bound. The default behavior is to show both the upper and lower
486 bound in /proc/cpuinfo. If the range is large, the temperature is
487 either changing a lot, or the TAU hardware is broken (likely on some
488 G4's). If the range is small (around 4 degrees), the temperature is
489 relatively stable. If you say Y here, a single temperature value,
490 halfway between the upper and lower bounds, will be reported in
493 If in doubt, say N here.
496 source arch/powerpc/platforms/embedded6xx/Kconfig
497 source arch/powerpc/platforms/4xx/Kconfig
498 source arch/powerpc/platforms/85xx/Kconfig
499 source arch/powerpc/platforms/8xx/Kconfig
500 source arch/powerpc/platforms/cell/Kconfig
502 menu "Kernel options"
505 bool "High memory support"
508 source kernel/Kconfig.hz
509 source kernel/Kconfig.preempt
510 source "fs/Kconfig.binfmt"
512 # We optimistically allocate largepages from the VM, so make the limit
513 # large enough (16MB). This badly named config option is actually
515 config FORCE_MAX_ZONEORDER
518 default "9" if PPC_64K_PAGES
521 config MATH_EMULATION
522 bool "Math emulation"
523 depends on 4xx || 8xx || E200 || E500
525 Some PowerPC chips designed for embedded applications do not have
526 a floating-point unit and therefore do not implement the
527 floating-point instructions in the PowerPC instruction set. If you
528 say Y here, the kernel will include code to emulate a floating-point
529 unit, which will allow programs that use floating-point
533 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
534 depends on EXPERIMENTAL && PPC64
537 Cause IO segments sent to a device for DMA to be merged virtually
538 by the IOMMU when they happen to have been allocated contiguously.
539 This doesn't add pressure to the IOMMU allocator. However, some
540 drivers don't support getting large merged segments coming back
541 from *_map_sg(). Say Y if you know the drivers you are using are
542 properly handling this case.
545 bool "Support for enabling/disabling CPUs"
546 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
548 Say Y here to be able to disable and re-enable individual
549 CPUs at runtime on SMP machines.
551 Say N if you are unsure.
554 bool "kexec system call (EXPERIMENTAL)"
555 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
557 kexec is a system call that implements the ability to shutdown your
558 current kernel, and to start another kernel. It is like a reboot
559 but it is indepedent of the system firmware. And like a reboot
560 you can start any kernel with it, not just Linux.
562 The name comes from the similiarity to the exec system call.
564 It is an ongoing process to be certain the hardware in a machine
565 is properly shutdown, so do not be surprised if this code does not
566 initially work for you. It may help to enable device hotplugging
567 support. As of this writing the exact hardware interface is
568 strongly in flux, so no good recommendation can be made.
572 depends on 8xx || 8260
576 bool "PC PS/2 style Keyboard"
577 depends on 4xx || CPM2
580 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
581 default y if PPC_PREP
584 bool "Distribute interrupts on all CPUs by default"
585 depends on SMP && !MV64360
587 This option gives the kernel permission to distribute IRQs across
588 multiple CPUs. Saying N here will route all IRQs to the first
589 CPU. Generally saying Y is safe, although some problems have been
590 reported with SMP Power Macintoshes with this option enabled.
592 source "arch/powerpc/platforms/pseries/Kconfig"
597 default y if SMP && PPC_PSERIES
599 config ARCH_SELECT_MEMORY_MODEL
603 config ARCH_FLATMEM_ENABLE
605 depends on (PPC64 && !NUMA) || PPC32
607 config ARCH_SPARSEMEM_ENABLE
611 config ARCH_SPARSEMEM_DEFAULT
613 depends on SMP && PPC_PSERIES
617 config HAVE_ARCH_EARLY_PFN_TO_NID
619 depends on NEED_MULTIPLE_NODES
621 config ARCH_MEMORY_PROBE
623 depends on MEMORY_HOTPLUG
629 This option changes the kernel logical page size to 64k. On machines
630 without processor support for 64k pages, the kernel will simulate
631 them by loading each individual 4k page on demand transparently,
632 while on hardware with such support, it will be used to map
633 normal application pages.
636 bool "SMT (Hyperthreading) scheduler support"
637 depends on PPC64 && SMP
640 SMT scheduler support improves the CPU scheduler's decision making
641 when dealing with POWER5 cpus at a cost of slightly increased
642 overhead in some places. If unsure say N here.
644 config PROC_DEVICETREE
645 bool "Support for device tree in /proc"
648 This option adds a device-tree directory under /proc which contains
649 an image of the device tree that the kernel copies from Open
650 Firmware or other boot firmware. If unsure, say Y here.
652 source "arch/powerpc/platforms/prep/Kconfig"
655 bool "Default bootloader kernel arguments"
656 depends on !PPC_ISERIES
659 string "Initial kernel command string"
660 depends on CMDLINE_BOOL
661 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
663 On some platforms, there is currently no way for the boot loader to
664 pass arguments to the kernel. For these platforms, you can supply
665 some command-line options at build time by entering them here. In
666 most cases you will need to specify the root device here.
669 source kernel/power/Kconfig
673 bool "Enable seccomp to safely compute untrusted bytecode"
677 This kernel feature is useful for number crunching applications
678 that may need to compute untrusted bytecode during their
679 execution. By using pipes or other transports made available to
680 the process as file descriptors supporting the read/write
681 syscalls, it's possible to isolate those applications in
682 their own address space using seccomp. Once seccomp is
683 enabled via /proc/<pid>/seccomp, it cannot be disabled
684 and the task is only allowed to execute a few safe syscalls
685 defined by each seccomp mode.
687 If unsure, say Y. Only embedded should say N here.
698 bool "Support for ISA-bus hardware"
699 depends on PPC_PREP || PPC_CHRP
702 Find out whether you have ISA slots on your motherboard. ISA is the
703 name of a bus system, i.e. the way the CPU talks to the other stuff
704 inside your box. If you have an Apple machine, say N here; if you
705 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
706 you have an embedded board, consult your board documentation.
708 config GENERIC_ISA_DMA
710 depends on PPC64 || POWER4 || 6xx && !CPM2
718 config PPC_INDIRECT_PCI
721 default y if 40x || 44x || 85xx || 83xx
730 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
735 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
736 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
737 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
738 default PCI_QSPAN if !4xx && !CPM2 && 8xx
740 Find out whether your system includes a PCI bus. PCI is the name of
741 a bus system, i.e. the way the CPU talks to the other stuff inside
742 your box. If you say Y here, the kernel will include drivers and
743 infrastructure code to support PCI bus devices.
750 bool " Supprt for 2nd PCI host controller"
751 depends on PCI && MPC834x
752 default y if MPC834x_SYS
756 depends on !4xx && !CPM2 && 8xx
759 Say Y here if you have a system based on a Motorola 8xx-series
760 embedded processor with a QSPAN PCI interface, otherwise say N.
764 depends on PCI && 8260
765 select PPC_INDIRECT_PCI
769 bool " Enable workaround for MPC826x erratum PCI 9"
770 depends on PCI_8260 && !ADS8272
774 prompt " IDMA channel for PCI 9 workaround"
777 config 8260_PCI9_IDMA1
780 config 8260_PCI9_IDMA2
783 config 8260_PCI9_IDMA3
786 config 8260_PCI9_IDMA4
791 source "drivers/pci/Kconfig"
793 source "drivers/pcmcia/Kconfig"
795 source "drivers/pci/hotplug/Kconfig"
799 menu "Advanced setup"
802 config ADVANCED_OPTIONS
803 bool "Prompt for advanced kernel configuration options"
805 This option will enable prompting for a variety of advanced kernel
806 configuration options. These options can cause the kernel to not
807 work if they are set incorrectly, but can be used to optimize certain
808 aspects of kernel memory management.
810 Unless you know what you are doing, say N here.
812 comment "Default settings for advanced configuration options are used"
813 depends on !ADVANCED_OPTIONS
815 config HIGHMEM_START_BOOL
816 bool "Set high memory pool address"
817 depends on ADVANCED_OPTIONS && HIGHMEM
819 This option allows you to set the base address of the kernel virtual
820 area used to map high memory pages. This can be useful in
821 optimizing the layout of kernel virtual memory.
823 Say N here unless you know what you are doing.
826 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
829 config LOWMEM_SIZE_BOOL
830 bool "Set maximum low memory"
831 depends on ADVANCED_OPTIONS
833 This option allows you to set the maximum amount of memory which
834 will be used as "low memory", that is, memory which the kernel can
835 access directly, without having to set up a kernel virtual mapping.
836 This can be useful in optimizing the layout of kernel virtual
839 Say N here unless you know what you are doing.
842 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
845 config KERNEL_START_BOOL
846 bool "Set custom kernel base address"
847 depends on ADVANCED_OPTIONS
849 This option allows you to set the kernel virtual address at which
850 the kernel will map low memory (the kernel image will be linked at
851 this address). This can be useful in optimizing the virtual memory
852 layout of the system.
854 Say N here unless you know what you are doing.
857 hex "Virtual address of kernel base" if KERNEL_START_BOOL
860 config TASK_SIZE_BOOL
861 bool "Set custom user task size"
862 depends on ADVANCED_OPTIONS
864 This option allows you to set the amount of virtual address space
865 allocated to user tasks. This can be useful in optimizing the
866 virtual memory layout of the system.
868 Say N here unless you know what you are doing.
871 hex "Size of user task space" if TASK_SIZE_BOOL
874 config CONSISTENT_START_BOOL
875 bool "Set custom consistent memory pool address"
876 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
878 This option allows you to set the base virtual address
879 of the the consistent memory pool. This pool of virtual
880 memory is used to make consistent memory allocations.
882 config CONSISTENT_START
883 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
884 default "0xff100000" if NOT_COHERENT_CACHE
886 config CONSISTENT_SIZE_BOOL
887 bool "Set custom consistent memory pool size"
888 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
890 This option allows you to set the size of the the
891 consistent memory pool. This pool of virtual memory
892 is used to make consistent memory allocations.
894 config CONSISTENT_SIZE
895 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
896 default "0x00200000" if NOT_COHERENT_CACHE
898 config BOOT_LOAD_BOOL
899 bool "Set the boot link/load address"
900 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
902 This option allows you to set the initial load address of the zImage
903 or zImage.initrd file. This can be useful if you are on a board
904 which has a small amount of memory.
906 Say N here unless you know what you are doing.
909 hex "Link/load address for booting" if BOOT_LOAD_BOOL
910 default "0x00400000" if 40x || 8xx || 8260
911 default "0x01000000" if 44x
915 bool "Pinned Kernel TLBs (860 ONLY)"
916 depends on ADVANCED_OPTIONS && 8xx
922 default "0xc000000000000000"
927 source "drivers/Kconfig"
931 # XXX source "arch/ppc/8xx_io/Kconfig"
933 # XXX source "arch/ppc/8260_io/Kconfig"
935 source "arch/powerpc/platforms/iseries/Kconfig"
939 menu "Instrumentation Support"
940 depends on EXPERIMENTAL
942 source "arch/powerpc/oprofile/Kconfig"
945 bool "Kprobes (EXPERIMENTAL)"
948 Kprobes allows you to trap at almost any kernel address and
949 execute a callback function. register_kprobe() establishes
950 a probepoint and specifies the callback. Kprobes is useful
951 for kernel debugging, non-intrusive instrumentation and testing.
952 If in doubt, say "N".
955 source "arch/powerpc/Kconfig.debug"
957 source "security/Kconfig"
961 depends on COMPAT && KEYS
964 source "crypto/Kconfig"