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
100 select COMPAT_BINFMT_ELF
102 config SYSVIPC_COMPAT
104 depends on COMPAT && SYSVIPC
107 # All PPC32s use generic nvram driver through ppc_md
112 config SCHED_NO_NO_OMIT_FRAME_POINTER
116 config ARCH_MAY_HAVE_PC_FDC
118 default !PPC_PSERIES || PCI
126 config PPC_UDBG_16550
130 config GENERIC_TBSYNC
132 default y if PPC32 && SMP
144 config SYS_SUPPORTS_APM_EMULATION
145 default y if PMAC_APM_EMU
148 config DEFAULT_UIMAGE
151 Used to allow a board to specify it wants a uImage built by default
159 depends on (PPC_PMAC && !SMP) || BROKEN
164 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
167 config ARCH_HIBERNATION_POSSIBLE
169 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
172 config ARCH_SUSPEND_POSSIBLE
174 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
176 config PPC_DCR_NATIVE
186 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
189 config PPC_OF_PLATFORM_PCI
192 depends on PPC64 # not supported on 32 bits yet
195 source "init/Kconfig"
197 source "arch/powerpc/sysdev/Kconfig"
198 source "arch/powerpc/platforms/Kconfig"
200 menu "Kernel options"
203 bool "High memory support"
206 source kernel/time/Kconfig
207 source kernel/Kconfig.hz
208 source kernel/Kconfig.preempt
209 source "fs/Kconfig.binfmt"
211 # We optimistically allocate largepages from the VM, so make the limit
212 # large enough (16MB). This badly named config option is actually
214 config FORCE_MAX_ZONEORDER
217 default "9" if PPC_64K_PAGES
220 config HUGETLB_PAGE_SIZE_VARIABLE
222 depends on HUGETLB_PAGE
225 config MATH_EMULATION
226 bool "Math emulation"
227 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
229 Some PowerPC chips designed for embedded applications do not have
230 a floating-point unit and therefore do not implement the
231 floating-point instructions in the PowerPC instruction set. If you
232 say Y here, the kernel will include code to emulate a floating-point
233 unit, which will allow programs that use floating-point
236 config 8XX_MINIMAL_FPEMU
237 bool "Minimal math emulation for 8xx"
238 depends on 8xx && !MATH_EMULATION
240 Older arch/ppc kernels still emulated a few floating point
241 instructions such as load and store, even when full math
242 emulation is disabled. Say "Y" here if you want to preserve
245 It is recommended that you build a soft-float userspace instead.
248 bool "Enable IOMMU virtual merging"
252 Cause IO segments sent to a device for DMA to be merged virtually
253 by the IOMMU when they happen to have been allocated contiguously.
254 This doesn't add pressure to the IOMMU allocator. However, some
255 drivers don't support getting large merged segments coming back
258 Most drivers don't have this problem; it is safe to say Y here.
264 bool "Support for enabling/disabling CPUs"
265 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
267 Say Y here to be able to disable and re-enable individual
268 CPUs at runtime on SMP machines.
270 Say N if you are unsure.
272 config ARCH_ENABLE_MEMORY_HOTPLUG
276 bool "kexec system call (EXPERIMENTAL)"
277 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
279 kexec is a system call that implements the ability to shutdown your
280 current kernel, and to start another kernel. It is like a reboot
281 but it is independent of the system firmware. And like a reboot
282 you can start any kernel with it, not just Linux.
284 The name comes from the similarity to the exec system call.
286 It is an ongoing process to be certain the hardware in a machine
287 is properly shutdown, so do not be surprised if this code does not
288 initially work for you. It may help to enable device hotplugging
289 support. As of this writing the exact hardware interface is
290 strongly in flux, so no good recommendation can be made.
293 bool "Build a kdump crash kernel (EXPERIMENTAL)"
294 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
296 Build a kernel suitable for use as a kdump capture kernel.
297 The kernel will be linked at a different address than normal, and
298 so can only be used for Kdump.
300 Don't change this unless you know what you are doing.
303 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
304 default y if PPC_PREP
307 bool "Distribute interrupts on all CPUs by default"
308 depends on SMP && !MV64360
310 This option gives the kernel permission to distribute IRQs across
311 multiple CPUs. Saying N here will route all IRQs to the first
312 CPU. Generally saying Y is safe, although some problems have been
313 reported with SMP Power Macintoshes with this option enabled.
318 default y if SMP && PPC_PSERIES
323 depends on NEED_MULTIPLE_NODES
325 config ARCH_SELECT_MEMORY_MODEL
329 config ARCH_FLATMEM_ENABLE
331 depends on (PPC64 && !NUMA) || PPC32
333 config ARCH_SPARSEMEM_ENABLE
336 select SPARSEMEM_VMEMMAP_ENABLE
338 config ARCH_SPARSEMEM_DEFAULT
340 depends on (SMP && PPC_PSERIES) || PPC_PS3
342 config ARCH_POPULATES_NODE_MAP
347 config ARCH_MEMORY_PROBE
349 depends on MEMORY_HOTPLUG
351 # Some NUMA nodes have memory ranges that span
352 # other nodes. Even though a pfn is valid and
353 # between a node's start and end pfns, it may not
354 # reside on that node. See memmap_init_zone()
356 config NODES_SPAN_OTHER_NODES
358 depends on NEED_MULTIPLE_NODES
360 config PPC_HAS_HASH_64K
368 select PPC_HAS_HASH_64K
370 This option changes the kernel logical page size to 64k. On machines
371 without processor support for 64k pages, the kernel will simulate
372 them by loading each individual 4k page on demand transparently,
373 while on hardware with such support, it will be used to map
374 normal application pages.
376 config PPC_SUBPAGE_PROT
377 bool "Support setting protections for 4k subpages"
378 depends on PPC_64K_PAGES
380 This option adds support for a system call to allow user programs
381 to set access permissions (read/write, readonly, or no access)
382 on the 4k subpages of each 64k page.
385 bool "SMT (Hyperthreading) scheduler support"
386 depends on PPC64 && SMP
388 SMT scheduler support improves the CPU scheduler's decision making
389 when dealing with POWER5 cpus at a cost of slightly increased
390 overhead in some places. If unsure say N here.
392 config PROC_DEVICETREE
393 bool "Support for device tree in /proc"
396 This option adds a device-tree directory under /proc which contains
397 an image of the device tree that the kernel copies from Open
398 Firmware or other boot firmware. If unsure, say Y here.
401 bool "Default bootloader kernel arguments"
404 string "Initial kernel command string"
405 depends on CMDLINE_BOOL
406 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
408 On some platforms, there is currently no way for the boot loader to
409 pass arguments to the kernel. For these platforms, you can supply
410 some command-line options at build time by entering them here. In
411 most cases you will need to specify the root device here.
414 config ARCH_WANTS_FREEZER_CONTROL
418 source kernel/power/Kconfig
422 bool "Enable seccomp to safely compute untrusted bytecode"
426 This kernel feature is useful for number crunching applications
427 that may need to compute untrusted bytecode during their
428 execution. By using pipes or other transports made available to
429 the process as file descriptors supporting the read/write
430 syscalls, it's possible to isolate those applications in
431 their own address space using seccomp. Once seccomp is
432 enabled via /proc/<pid>/seccomp, it cannot be disabled
433 and the task is only allowed to execute a few safe syscalls
434 defined by each seccomp mode.
436 If unsure, say Y. Only embedded should say N here.
438 config WANT_DEVICE_TREE
446 default !PPC_ISERIES || PCI
451 bool "Support for ISA-bus hardware"
452 depends on PPC_PREP || PPC_CHRP
455 Find out whether you have ISA slots on your motherboard. ISA is the
456 name of a bus system, i.e. the way the CPU talks to the other stuff
457 inside your box. If you have an Apple machine, say N here; if you
458 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
459 you have an embedded board, consult your board documentation.
465 config GENERIC_ISA_DMA
467 depends on PPC64 || POWER4 || 6xx && !CPM2
470 config PPC_INDIRECT_PCI
473 default y if 40x || 44x
487 select PPC_INDIRECT_PCI
489 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
494 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
495 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
497 default y if !40x && !CPM2 && !8xx && !PPC_MPC512x && !PPC_83xx \
498 && !PPC_85xx && !PPC_86xx
499 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
500 default PCI_QSPAN if !4xx && !CPM2 && 8xx
501 select ARCH_SUPPORTS_MSI
503 Find out whether your system includes a PCI bus. PCI is the name of
504 a bus system, i.e. the way the CPU talks to the other stuff inside
505 your box. If you say Y here, the kernel will include drivers and
506 infrastructure code to support PCI bus devices.
516 depends on !4xx && !CPM2 && 8xx
519 Say Y here if you have a system based on a Motorola 8xx-series
520 embedded processor with a QSPAN PCI interface, otherwise say N.
524 depends on PCI && 8260
525 select PPC_INDIRECT_PCI
529 bool "Enable workaround for MPC826x erratum PCI 9"
530 depends on PCI_8260 && !8272
534 prompt "IDMA channel for PCI 9 workaround"
537 config 8260_PCI9_IDMA1
540 config 8260_PCI9_IDMA2
543 config 8260_PCI9_IDMA3
546 config 8260_PCI9_IDMA4
551 source "drivers/pci/pcie/Kconfig"
553 source "drivers/pci/Kconfig"
555 source "drivers/pcmcia/Kconfig"
557 source "drivers/pci/hotplug/Kconfig"
561 menu "Advanced setup"
564 config ADVANCED_OPTIONS
565 bool "Prompt for advanced kernel configuration options"
567 This option will enable prompting for a variety of advanced kernel
568 configuration options. These options can cause the kernel to not
569 work if they are set incorrectly, but can be used to optimize certain
570 aspects of kernel memory management.
572 Unless you know what you are doing, say N here.
574 comment "Default settings for advanced configuration options are used"
575 depends on !ADVANCED_OPTIONS
577 config HIGHMEM_START_BOOL
578 bool "Set high memory pool address"
579 depends on ADVANCED_OPTIONS && HIGHMEM
581 This option allows you to set the base address of the kernel virtual
582 area used to map high memory pages. This can be useful in
583 optimizing the layout of kernel virtual memory.
585 Say N here unless you know what you are doing.
588 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
591 config LOWMEM_SIZE_BOOL
592 bool "Set maximum low memory"
593 depends on ADVANCED_OPTIONS
595 This option allows you to set the maximum amount of memory which
596 will be used as "low memory", that is, memory which the kernel can
597 access directly, without having to set up a kernel virtual mapping.
598 This can be useful in optimizing the layout of kernel virtual
601 Say N here unless you know what you are doing.
604 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
607 config KERNEL_START_BOOL
608 bool "Set custom kernel base address"
609 depends on ADVANCED_OPTIONS
611 This option allows you to set the kernel virtual address at which
612 the kernel will map low memory (the kernel image will be linked at
613 this address). This can be useful in optimizing the virtual memory
614 layout of the system.
616 Say N here unless you know what you are doing.
619 hex "Virtual address of kernel base" if KERNEL_START_BOOL
622 config TASK_SIZE_BOOL
623 bool "Set custom user task size"
624 depends on ADVANCED_OPTIONS
626 This option allows you to set the amount of virtual address space
627 allocated to user tasks. This can be useful in optimizing the
628 virtual memory layout of the system.
630 Say N here unless you know what you are doing.
633 hex "Size of user task space" if TASK_SIZE_BOOL
634 default "0x80000000" if PPC_PREP || PPC_8xx
637 config CONSISTENT_START_BOOL
638 bool "Set custom consistent memory pool address"
639 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
641 This option allows you to set the base virtual address
642 of the consistent memory pool. This pool of virtual
643 memory is used to make consistent memory allocations.
645 config CONSISTENT_START
646 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
647 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
648 default "0xff100000" if NOT_COHERENT_CACHE
650 config CONSISTENT_SIZE_BOOL
651 bool "Set custom consistent memory pool size"
652 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
654 This option allows you to set the size of the
655 consistent memory pool. This pool of virtual memory
656 is used to make consistent memory allocations.
658 config CONSISTENT_SIZE
659 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
660 default "0x00200000" if NOT_COHERENT_CACHE
662 config BOOT_LOAD_BOOL
663 bool "Set the boot link/load address"
664 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
666 This option allows you to set the initial load address of the zImage
667 or zImage.initrd file. This can be useful if you are on a board
668 which has a small amount of memory.
670 Say N here unless you know what you are doing.
673 hex "Link/load address for booting" if BOOT_LOAD_BOOL
674 default "0x00400000" if 40x || 8xx || 8260
675 default "0x01000000" if 44x
679 bool "Pinned Kernel TLBs (860 ONLY)"
680 depends on ADVANCED_OPTIONS && 8xx
686 default "0xc000000000000000"
691 source "drivers/Kconfig"
695 # XXX source "arch/ppc/8xx_io/Kconfig"
697 # XXX source "arch/ppc/8260_io/Kconfig"
699 source "arch/powerpc/sysdev/qe_lib/Kconfig"
703 source "arch/powerpc/Kconfig.debug"
705 source "security/Kconfig"
709 depends on COMPAT && KEYS
712 source "crypto/Kconfig"