1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
5 mainmenu "Linux/PowerPC Kernel Configuration"
7 source "arch/powerpc/platforms/Kconfig.cputype"
29 config GENERIC_CMOS_UPDATE
35 config GENERIC_TIME_VSYSCALL
38 config GENERIC_CLOCKEVENTS
41 config GENERIC_HARDIRQS
45 config HAVE_SETUP_PER_CPU_AREA
52 config RWSEM_GENERIC_SPINLOCK
55 config RWSEM_XCHGADD_ALGORITHM
59 config GENERIC_LOCKBREAK
62 depends on SMP && PREEMPT
64 config ARCH_HAS_ILOG2_U32
68 config ARCH_HAS_ILOG2_U64
72 config GENERIC_HWEIGHT
76 config GENERIC_CALIBRATE_DELAY
80 config GENERIC_FIND_NEXT_BIT
84 config ARCH_NO_VIRT_TO_BUS
101 select COMPAT_BINFMT_ELF
103 config SYSVIPC_COMPAT
105 depends on COMPAT && SYSVIPC
108 # All PPC32s use generic nvram driver through ppc_md
113 config SCHED_NO_NO_OMIT_FRAME_POINTER
117 config ARCH_MAY_HAVE_PC_FDC
119 default !PPC_PSERIES || PCI
127 config PPC_UDBG_16550
131 config GENERIC_TBSYNC
133 default y if PPC32 && SMP
145 config SYS_SUPPORTS_APM_EMULATION
146 default y if PMAC_APM_EMU
149 config DEFAULT_UIMAGE
152 Used to allow a board to specify it wants a uImage built by default
160 depends on (PPC_PMAC && !SMP) || BROKEN
165 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
168 config ARCH_HIBERNATION_POSSIBLE
170 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
173 config ARCH_SUSPEND_POSSIBLE
175 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
177 config PPC_DCR_NATIVE
187 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
190 config PPC_OF_PLATFORM_PCI
193 depends on PPC64 # not supported on 32 bits yet
196 source "init/Kconfig"
198 source "arch/powerpc/sysdev/Kconfig"
199 source "arch/powerpc/platforms/Kconfig"
201 menu "Kernel options"
204 bool "High memory support"
207 source kernel/time/Kconfig
208 source kernel/Kconfig.hz
209 source kernel/Kconfig.preempt
210 source "fs/Kconfig.binfmt"
212 # We optimistically allocate largepages from the VM, so make the limit
213 # large enough (16MB). This badly named config option is actually
215 config FORCE_MAX_ZONEORDER
218 default "9" if PPC_64K_PAGES
221 config HUGETLB_PAGE_SIZE_VARIABLE
223 depends on HUGETLB_PAGE
226 config MATH_EMULATION
227 bool "Math emulation"
228 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
230 Some PowerPC chips designed for embedded applications do not have
231 a floating-point unit and therefore do not implement the
232 floating-point instructions in the PowerPC instruction set. If you
233 say Y here, the kernel will include code to emulate a floating-point
234 unit, which will allow programs that use floating-point
237 config 8XX_MINIMAL_FPEMU
238 bool "Minimal math emulation for 8xx"
239 depends on 8xx && !MATH_EMULATION
241 Older arch/ppc kernels still emulated a few floating point
242 instructions such as load and store, even when full math
243 emulation is disabled. Say "Y" here if you want to preserve
246 It is recommended that you build a soft-float userspace instead.
249 bool "Enable IOMMU virtual merging"
253 Cause IO segments sent to a device for DMA to be merged virtually
254 by the IOMMU when they happen to have been allocated contiguously.
255 This doesn't add pressure to the IOMMU allocator. However, some
256 drivers don't support getting large merged segments coming back
259 Most drivers don't have this problem; it is safe to say Y here.
265 bool "Support for enabling/disabling CPUs"
266 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
268 Say Y here to be able to disable and re-enable individual
269 CPUs at runtime on SMP machines.
271 Say N if you are unsure.
273 config ARCH_ENABLE_MEMORY_HOTPLUG
276 config ARCH_HAS_WALK_MEMORY
279 config ARCH_ENABLE_MEMORY_HOTREMOVE
283 bool "kexec system call (EXPERIMENTAL)"
284 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
286 kexec is a system call that implements the ability to shutdown your
287 current kernel, and to start another kernel. It is like a reboot
288 but it is independent of the system firmware. And like a reboot
289 you can start any kernel with it, not just Linux.
291 The name comes from the similarity to the exec system call.
293 It is an ongoing process to be certain the hardware in a machine
294 is properly shutdown, so do not be surprised if this code does not
295 initially work for you. It may help to enable device hotplugging
296 support. As of this writing the exact hardware interface is
297 strongly in flux, so no good recommendation can be made.
300 bool "Build a kdump crash kernel (EXPERIMENTAL)"
301 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
303 Build a kernel suitable for use as a kdump capture kernel.
304 The kernel will be linked at a different address than normal, and
305 so can only be used for Kdump.
307 Don't change this unless you know what you are doing.
310 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
311 default y if PPC_PREP
314 bool "Distribute interrupts on all CPUs by default"
315 depends on SMP && !MV64360
317 This option gives the kernel permission to distribute IRQs across
318 multiple CPUs. Saying N here will route all IRQs to the first
319 CPU. Generally saying Y is safe, although some problems have been
320 reported with SMP Power Macintoshes with this option enabled.
325 default y if SMP && PPC_PSERIES
330 depends on NEED_MULTIPLE_NODES
332 config ARCH_SELECT_MEMORY_MODEL
336 config ARCH_FLATMEM_ENABLE
338 depends on (PPC64 && !NUMA) || PPC32
340 config ARCH_SPARSEMEM_ENABLE
343 select SPARSEMEM_VMEMMAP_ENABLE
345 config ARCH_SPARSEMEM_DEFAULT
347 depends on (SMP && PPC_PSERIES) || PPC_PS3
349 config ARCH_POPULATES_NODE_MAP
354 config ARCH_MEMORY_PROBE
356 depends on MEMORY_HOTPLUG
358 # Some NUMA nodes have memory ranges that span
359 # other nodes. Even though a pfn is valid and
360 # between a node's start and end pfns, it may not
361 # reside on that node. See memmap_init_zone()
363 config NODES_SPAN_OTHER_NODES
365 depends on NEED_MULTIPLE_NODES
367 config PPC_HAS_HASH_64K
375 select PPC_HAS_HASH_64K
377 This option changes the kernel logical page size to 64k. On machines
378 without processor support for 64k pages, the kernel will simulate
379 them by loading each individual 4k page on demand transparently,
380 while on hardware with such support, it will be used to map
381 normal application pages.
383 config PPC_SUBPAGE_PROT
384 bool "Support setting protections for 4k subpages"
385 depends on PPC_64K_PAGES
387 This option adds support for a system call to allow user programs
388 to set access permissions (read/write, readonly, or no access)
389 on the 4k subpages of each 64k page.
392 bool "SMT (Hyperthreading) scheduler support"
393 depends on PPC64 && SMP
395 SMT scheduler support improves the CPU scheduler's decision making
396 when dealing with POWER5 cpus at a cost of slightly increased
397 overhead in some places. If unsure say N here.
399 config PROC_DEVICETREE
400 bool "Support for device tree in /proc"
403 This option adds a device-tree directory under /proc which contains
404 an image of the device tree that the kernel copies from Open
405 Firmware or other boot firmware. If unsure, say Y here.
408 bool "Default bootloader kernel arguments"
411 string "Initial kernel command string"
412 depends on CMDLINE_BOOL
413 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
415 On some platforms, there is currently no way for the boot loader to
416 pass arguments to the kernel. For these platforms, you can supply
417 some command-line options at build time by entering them here. In
418 most cases you will need to specify the root device here.
421 config ARCH_WANTS_FREEZER_CONTROL
425 source kernel/power/Kconfig
429 bool "Enable seccomp to safely compute untrusted bytecode"
433 This kernel feature is useful for number crunching applications
434 that may need to compute untrusted bytecode during their
435 execution. By using pipes or other transports made available to
436 the process as file descriptors supporting the read/write
437 syscalls, it's possible to isolate those applications in
438 their own address space using seccomp. Once seccomp is
439 enabled via /proc/<pid>/seccomp, it cannot be disabled
440 and the task is only allowed to execute a few safe syscalls
441 defined by each seccomp mode.
443 If unsure, say Y. Only embedded should say N here.
449 default !PPC_ISERIES || PCI
454 bool "Support for ISA-bus hardware"
455 depends on PPC_PREP || PPC_CHRP
458 Find out whether you have ISA slots on your motherboard. ISA is the
459 name of a bus system, i.e. the way the CPU talks to the other stuff
460 inside your box. If you have an Apple machine, say N here; if you
461 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
462 you have an embedded board, consult your board documentation.
468 config GENERIC_ISA_DMA
470 depends on PPC64 || POWER4 || 6xx && !CPM2
473 config PPC_INDIRECT_PCI
476 default y if 40x || 44x
490 select PPC_INDIRECT_PCI
492 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
497 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
498 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
500 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
501 && !PPC_85xx && !PPC_86xx
502 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
503 default PCI_QSPAN if !4xx && !CPM2 && 8xx
504 select ARCH_SUPPORTS_MSI
506 Find out whether your system includes a PCI bus. PCI is the name of
507 a bus system, i.e. the way the CPU talks to the other stuff inside
508 your box. If you say Y here, the kernel will include drivers and
509 infrastructure code to support PCI bus devices.
519 depends on !4xx && !CPM2 && 8xx
522 Say Y here if you have a system based on a Motorola 8xx-series
523 embedded processor with a QSPAN PCI interface, otherwise say N.
527 depends on PCI && 8260
528 select PPC_INDIRECT_PCI
532 bool "Enable workaround for MPC826x erratum PCI 9"
533 depends on PCI_8260 && !8272
537 prompt "IDMA channel for PCI 9 workaround"
540 config 8260_PCI9_IDMA1
543 config 8260_PCI9_IDMA2
546 config 8260_PCI9_IDMA3
549 config 8260_PCI9_IDMA4
554 source "drivers/pci/pcie/Kconfig"
556 source "drivers/pci/Kconfig"
558 source "drivers/pcmcia/Kconfig"
560 source "drivers/pci/hotplug/Kconfig"
564 menu "Advanced setup"
567 config ADVANCED_OPTIONS
568 bool "Prompt for advanced kernel configuration options"
570 This option will enable prompting for a variety of advanced kernel
571 configuration options. These options can cause the kernel to not
572 work if they are set incorrectly, but can be used to optimize certain
573 aspects of kernel memory management.
575 Unless you know what you are doing, say N here.
577 comment "Default settings for advanced configuration options are used"
578 depends on !ADVANCED_OPTIONS
580 config HIGHMEM_START_BOOL
581 bool "Set high memory pool address"
582 depends on ADVANCED_OPTIONS && HIGHMEM
584 This option allows you to set the base address of the kernel virtual
585 area used to map high memory pages. This can be useful in
586 optimizing the layout of kernel virtual memory.
588 Say N here unless you know what you are doing.
591 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
594 config LOWMEM_SIZE_BOOL
595 bool "Set maximum low memory"
596 depends on ADVANCED_OPTIONS
598 This option allows you to set the maximum amount of memory which
599 will be used as "low memory", that is, memory which the kernel can
600 access directly, without having to set up a kernel virtual mapping.
601 This can be useful in optimizing the layout of kernel virtual
604 Say N here unless you know what you are doing.
607 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
610 config KERNEL_START_BOOL
611 bool "Set custom kernel base address"
612 depends on ADVANCED_OPTIONS
614 This option allows you to set the kernel virtual address at which
615 the kernel will map low memory (the kernel image will be linked at
616 this address). This can be useful in optimizing the virtual memory
617 layout of the system.
619 Say N here unless you know what you are doing.
622 hex "Virtual address of kernel base" if KERNEL_START_BOOL
625 config TASK_SIZE_BOOL
626 bool "Set custom user task size"
627 depends on ADVANCED_OPTIONS
629 This option allows you to set the amount of virtual address space
630 allocated to user tasks. This can be useful in optimizing the
631 virtual memory layout of the system.
633 Say N here unless you know what you are doing.
636 hex "Size of user task space" if TASK_SIZE_BOOL
637 default "0x80000000" if PPC_PREP || PPC_8xx
640 config CONSISTENT_START_BOOL
641 bool "Set custom consistent memory pool address"
642 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
644 This option allows you to set the base virtual address
645 of the consistent memory pool. This pool of virtual
646 memory is used to make consistent memory allocations.
648 config CONSISTENT_START
649 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
650 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
651 default "0xff100000" if NOT_COHERENT_CACHE
653 config CONSISTENT_SIZE_BOOL
654 bool "Set custom consistent memory pool size"
655 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
657 This option allows you to set the size of the
658 consistent memory pool. This pool of virtual memory
659 is used to make consistent memory allocations.
661 config CONSISTENT_SIZE
662 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
663 default "0x00200000" if NOT_COHERENT_CACHE
665 config BOOT_LOAD_BOOL
666 bool "Set the boot link/load address"
667 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
669 This option allows you to set the initial load address of the zImage
670 or zImage.initrd file. This can be useful if you are on a board
671 which has a small amount of memory.
673 Say N here unless you know what you are doing.
676 hex "Link/load address for booting" if BOOT_LOAD_BOOL
677 default "0x00400000" if 40x || 8xx || 8260
678 default "0x01000000" if 44x
682 bool "Pinned Kernel TLBs (860 ONLY)"
683 depends on ADVANCED_OPTIONS && 8xx
689 default "0xc000000000000000"
694 source "drivers/Kconfig"
698 # XXX source "arch/ppc/8xx_io/Kconfig"
700 # XXX source "arch/ppc/8260_io/Kconfig"
702 source "arch/powerpc/sysdev/qe_lib/Kconfig"
706 source "arch/powerpc/Kconfig.debug"
708 source "security/Kconfig"
712 depends on COMPAT && KEYS
715 source "crypto/Kconfig"