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"
281 bool " Common Hardware Reference Platform (CHRP) based machines"
282 depends on PPC_MULTIPLATFORM && PPC32
286 bool " Apple PowerMac based machines"
287 depends on PPC_MULTIPLATFORM
292 depends on PPC_PMAC && POWER4
296 bool " PowerPC Reference Platform (PReP) based machines"
297 depends on PPC_MULTIPLATFORM && PPC32
301 depends on PPC_MULTIPLATFORM && PPC64
302 bool " Maple 970FX Evaluation Board"
304 select MPIC_BROKEN_U3
307 This option enables support for the Maple 970FX Evaluation Board.
308 For more informations, refer to <http://www.970eval.com>
311 bool " Broadband Processor Architecture"
312 depends on PPC_MULTIPLATFORM && PPC64
316 depends on PPC_MULTIPLATFORM # for now
320 depends on PPC_PSERIES
326 depends on PPC_MULTIPLATFORM && PPC64
330 depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE
334 config MPIC_BROKEN_U3
345 depends on PPC_PSERIES || PPC_ISERIES
349 source "drivers/cpufreq/Kconfig"
352 bool "Support for Apple PowerBooks"
353 depends on CPU_FREQ && ADB_PMU && PPC32
354 select CPU_FREQ_TABLE
356 This adds support for frequency switching on Apple PowerBooks,
357 this currently includes some models of iBook & Titanium
360 config PPC601_SYNC_FIX
361 bool "Workarounds for PPC601 bugs"
362 depends on 6xx && (PPC_PREP || PPC_PMAC)
364 Some versions of the PPC601 (the first PowerPC chip) have bugs which
365 mean that extra synchronization instructions are required near
366 certain instructions, typically those that make major changes to the
367 CPU state. These extra instructions reduce performance slightly.
368 If you say N here, these extra instructions will not be included,
369 resulting in a kernel which will run faster but may not run at all
370 on some systems with the PPC601 chip.
372 If in doubt, say Y here.
375 bool "Thermal Management Support"
378 G3 and G4 processors have an on-chip temperature sensor called the
379 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
380 temperature within 2-4 degrees Celsius. This option shows the current
381 on-die temperature in /proc/cpuinfo if the cpu supports it.
383 Unfortunately, on some chip revisions, this sensor is very inaccurate
384 and in some cases, does not work at all, so don't assume the cpu
385 temp is actually what /proc/cpuinfo says it is.
388 bool "Interrupt driven TAU driver (DANGEROUS)"
391 The TAU supports an interrupt driven mode which causes an interrupt
392 whenever the temperature goes out of range. This is the fastest way
393 to get notified the temp has exceeded a range. With this option off,
394 a timer is used to re-check the temperature periodically.
396 However, on some cpus it appears that the TAU interrupt hardware
397 is buggy and can cause a situation which would lead unexplained hard
400 Unless you are extending the TAU driver, or enjoy kernel/hardware
401 debugging, leave this option off.
404 bool "Average high and low temp"
407 The TAU hardware can compare the temperature to an upper and lower
408 bound. The default behavior is to show both the upper and lower
409 bound in /proc/cpuinfo. If the range is large, the temperature is
410 either changing a lot, or the TAU hardware is broken (likely on some
411 G4's). If the range is small (around 4 degrees), the temperature is
412 relatively stable. If you say Y here, a single temperature value,
413 halfway between the upper and lower bounds, will be reported in
416 If in doubt, say N here.
419 source arch/powerpc/platforms/embedded6xx/Kconfig
420 source arch/powerpc/platforms/4xx/Kconfig
421 source arch/powerpc/platforms/85xx/Kconfig
422 source arch/powerpc/platforms/8xx/Kconfig
424 menu "Kernel options"
427 bool "High memory support"
430 source kernel/Kconfig.hz
431 source kernel/Kconfig.preempt
432 source "fs/Kconfig.binfmt"
434 # We optimistically allocate largepages from the VM, so make the limit
435 # large enough (16MB). This badly named config option is actually
437 config FORCE_MAX_ZONEORDER
442 config MATH_EMULATION
443 bool "Math emulation"
444 depends on 4xx || 8xx || E200 || E500
446 Some PowerPC chips designed for embedded applications do not have
447 a floating-point unit and therefore do not implement the
448 floating-point instructions in the PowerPC instruction set. If you
449 say Y here, the kernel will include code to emulate a floating-point
450 unit, which will allow programs that use floating-point
454 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
455 depends on EXPERIMENTAL && PPC64
458 Cause IO segments sent to a device for DMA to be merged virtually
459 by the IOMMU when they happen to have been allocated contiguously.
460 This doesn't add pressure to the IOMMU allocator. However, some
461 drivers don't support getting large merged segments coming back
462 from *_map_sg(). Say Y if you know the drivers you are using are
463 properly handling this case.
466 bool "Support for enabling/disabling CPUs"
467 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
469 Say Y here to be able to disable and re-enable individual
470 CPUs at runtime on SMP machines.
472 Say N if you are unsure.
475 bool "kexec system call (EXPERIMENTAL)"
476 depends on PPC_MULTIPLATFORM && EXPERIMENTAL
478 kexec is a system call that implements the ability to shutdown your
479 current kernel, and to start another kernel. It is like a reboot
480 but it is indepedent of the system firmware. And like a reboot
481 you can start any kernel with it, not just Linux.
483 The name comes from the similiarity to the exec system call.
485 It is an ongoing process to be certain the hardware in a machine
486 is properly shutdown, so do not be surprised if this code does not
487 initially work for you. It may help to enable device hotplugging
488 support. As of this writing the exact hardware interface is
489 strongly in flux, so no good recommendation can be made.
493 depends on 8xx || 8260
497 bool "PC PS/2 style Keyboard"
498 depends on 4xx || CPM2
501 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
502 default y if PPC_PREP
505 bool "Distribute interrupts on all CPUs by default"
506 depends on SMP && !MV64360
508 This option gives the kernel permission to distribute IRQs across
509 multiple CPUs. Saying N here will route all IRQs to the first
510 CPU. Generally saying Y is safe, although some problems have been
511 reported with SMP Power Macintoshes with this option enabled.
513 source "arch/powerpc/platforms/pseries/Kconfig"
515 config ARCH_SELECT_MEMORY_MODEL
519 config ARCH_FLATMEM_ENABLE
521 depends on PPC64 && !NUMA
523 config ARCH_DISCONTIGMEM_ENABLE
525 depends on SMP && PPC_PSERIES
527 config ARCH_DISCONTIGMEM_DEFAULT
529 depends on ARCH_DISCONTIGMEM_ENABLE
531 config ARCH_FLATMEM_ENABLE
535 config ARCH_SPARSEMEM_ENABLE
537 depends on ARCH_DISCONTIGMEM_ENABLE
541 config HAVE_ARCH_EARLY_PFN_TO_NID
543 depends on NEED_MULTIPLE_NODES
545 # Some NUMA nodes have memory ranges that span
546 # other nodes. Even though a pfn is valid and
547 # between a node's start and end pfns, it may not
548 # reside on that node.
550 # This is a relatively temporary hack that should
551 # be able to go away when sparsemem is fully in
554 config NODES_SPAN_OTHER_NODES
556 depends on NEED_MULTIPLE_NODES
560 default y if DISCONTIGMEM || SPARSEMEM
563 bool "SMT (Hyperthreading) scheduler support"
564 depends on PPC64 && SMP
567 SMT scheduler support improves the CPU scheduler's decision making
568 when dealing with POWER5 cpus at a cost of slightly increased
569 overhead in some places. If unsure say N here.
571 config PROC_DEVICETREE
572 bool "Support for Open Firmware device tree in /proc"
573 depends on (PPC_OF || PPC_ISERIES) && PROC_FS
575 This option adds a device-tree directory under /proc which contains
576 an image of the device tree that the kernel copies from Open
577 Firmware. If unsure, say Y here.
579 source "arch/powerpc/platforms/prep/Kconfig"
582 bool "Default bootloader kernel arguments"
583 depends on !PPC_ISERIES
586 string "Initial kernel command string"
587 depends on CMDLINE_BOOL
588 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
590 On some platforms, there is currently no way for the boot loader to
591 pass arguments to the kernel. For these platforms, you can supply
592 some command-line options at build time by entering them here. In
593 most cases you will need to specify the root device here.
596 source kernel/power/Kconfig
600 bool "Enable seccomp to safely compute untrusted bytecode"
604 This kernel feature is useful for number crunching applications
605 that may need to compute untrusted bytecode during their
606 execution. By using pipes or other transports made available to
607 the process as file descriptors supporting the read/write
608 syscalls, it's possible to isolate those applications in
609 their own address space using seccomp. Once seccomp is
610 enabled via /proc/<pid>/seccomp, it cannot be disabled
611 and the task is only allowed to execute a few safe syscalls
612 defined by each seccomp mode.
614 If unsure, say Y. Only embedded should say N here.
625 bool "Support for ISA-bus hardware"
626 depends on PPC_PREP || PPC_CHRP
628 Find out whether you have ISA slots on your motherboard. ISA is the
629 name of a bus system, i.e. the way the CPU talks to the other stuff
630 inside your box. If you have an Apple machine, say N here; if you
631 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
632 you have an embedded board, consult your board documentation.
634 config GENERIC_ISA_DMA
636 depends on PPC64 || POWER4 || 6xx && !CPM2
645 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
650 bool "PCI support" if 40x || CPM2 || 83xx || 85xx || PPC_MPC52xx || (EMBEDDED && PPC_ISERIES)
651 default y if !40x && !CPM2 && !8xx && !APUS && !83xx && !85xx
652 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
653 default PCI_QSPAN if !4xx && !CPM2 && 8xx
655 Find out whether your system includes a PCI bus. PCI is the name of
656 a bus system, i.e. the way the CPU talks to the other stuff inside
657 your box. If you say Y here, the kernel will include drivers and
658 infrastructure code to support PCI bus devices.
665 bool " Supprt for 2nd PCI host controller"
666 depends on PCI && MPC834x
667 default y if MPC834x_SYS
671 depends on !4xx && !CPM2 && 8xx
673 Say Y here if you have a system based on a Motorola 8xx-series
674 embedded processor with a QSPAN PCI interface, otherwise say N.
678 depends on PCI && 8260
682 bool " Enable workaround for MPC826x erratum PCI 9"
683 depends on PCI_8260 && !ADS8272
687 prompt " IDMA channel for PCI 9 workaround"
690 config 8260_PCI9_IDMA1
693 config 8260_PCI9_IDMA2
696 config 8260_PCI9_IDMA3
699 config 8260_PCI9_IDMA4
704 source "drivers/pci/Kconfig"
706 source "drivers/pcmcia/Kconfig"
708 source "drivers/pci/hotplug/Kconfig"
712 menu "Advanced setup"
715 config ADVANCED_OPTIONS
716 bool "Prompt for advanced kernel configuration options"
718 This option will enable prompting for a variety of advanced kernel
719 configuration options. These options can cause the kernel to not
720 work if they are set incorrectly, but can be used to optimize certain
721 aspects of kernel memory management.
723 Unless you know what you are doing, say N here.
725 comment "Default settings for advanced configuration options are used"
726 depends on !ADVANCED_OPTIONS
728 config HIGHMEM_START_BOOL
729 bool "Set high memory pool address"
730 depends on ADVANCED_OPTIONS && HIGHMEM
732 This option allows you to set the base address of the kernel virtual
733 area used to map high memory pages. This can be useful in
734 optimizing the layout of kernel virtual memory.
736 Say N here unless you know what you are doing.
739 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
742 config LOWMEM_SIZE_BOOL
743 bool "Set maximum low memory"
744 depends on ADVANCED_OPTIONS
746 This option allows you to set the maximum amount of memory which
747 will be used as "low memory", that is, memory which the kernel can
748 access directly, without having to set up a kernel virtual mapping.
749 This can be useful in optimizing the layout of kernel virtual
752 Say N here unless you know what you are doing.
755 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
758 config KERNEL_START_BOOL
759 bool "Set custom kernel base address"
760 depends on ADVANCED_OPTIONS
762 This option allows you to set the kernel virtual address at which
763 the kernel will map low memory (the kernel image will be linked at
764 this address). This can be useful in optimizing the virtual memory
765 layout of the system.
767 Say N here unless you know what you are doing.
770 hex "Virtual address of kernel base" if KERNEL_START_BOOL
773 config TASK_SIZE_BOOL
774 bool "Set custom user task size"
775 depends on ADVANCED_OPTIONS
777 This option allows you to set the amount of virtual address space
778 allocated to user tasks. This can be useful in optimizing the
779 virtual memory layout of the system.
781 Say N here unless you know what you are doing.
784 hex "Size of user task space" if TASK_SIZE_BOOL
787 config CONSISTENT_START_BOOL
788 bool "Set custom consistent memory pool address"
789 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
791 This option allows you to set the base virtual address
792 of the the consistent memory pool. This pool of virtual
793 memory is used to make consistent memory allocations.
795 config CONSISTENT_START
796 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
797 default "0xff100000" if NOT_COHERENT_CACHE
799 config CONSISTENT_SIZE_BOOL
800 bool "Set custom consistent memory pool size"
801 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
803 This option allows you to set the size of the the
804 consistent memory pool. This pool of virtual memory
805 is used to make consistent memory allocations.
807 config CONSISTENT_SIZE
808 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
809 default "0x00200000" if NOT_COHERENT_CACHE
811 config BOOT_LOAD_BOOL
812 bool "Set the boot link/load address"
813 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
815 This option allows you to set the initial load address of the zImage
816 or zImage.initrd file. This can be useful if you are on a board
817 which has a small amount of memory.
819 Say N here unless you know what you are doing.
822 hex "Link/load address for booting" if BOOT_LOAD_BOOL
823 default "0x00400000" if 40x || 8xx || 8260
824 default "0x01000000" if 44x
828 bool "Pinned Kernel TLBs (860 ONLY)"
829 depends on ADVANCED_OPTIONS && 8xx
835 default "0xc000000000000000"
840 source "drivers/Kconfig"
844 # XXX source "arch/ppc/8xx_io/Kconfig"
846 # XXX source "arch/ppc/8260_io/Kconfig"
848 source "arch/powerpc/platforms/iseries/Kconfig"
852 source "arch/powerpc/oprofile/Kconfig"
854 source "arch/powerpc/Kconfig.debug"
856 source "security/Kconfig"
860 depends on COMPAT && KEYS
863 source "crypto/Kconfig"