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 depends on COMPAT && SYSVIPC
104 # All PPC32s use generic nvram driver through ppc_md
109 config SCHED_NO_NO_OMIT_FRAME_POINTER
113 config ARCH_MAY_HAVE_PC_FDC
115 default !PPC_PSERIES || PCI
123 config PPC_UDBG_16550
127 config GENERIC_TBSYNC
129 default y if PPC32 && SMP
141 config SYS_SUPPORTS_APM_EMULATION
142 default y if PMAC_APM_EMU
145 config DEFAULT_UIMAGE
148 Used to allow a board to specify it wants a uImage built by default
156 depends on (PPC_PMAC && !SMP) || BROKEN
161 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
164 config ARCH_HIBERNATION_POSSIBLE
166 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
169 config PPC_DCR_NATIVE
179 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
182 config PPC_OF_PLATFORM_PCI
185 depends on PPC64 # not supported on 32 bits yet
188 source "init/Kconfig"
190 source "arch/powerpc/sysdev/Kconfig"
191 source "arch/powerpc/platforms/Kconfig"
193 menu "Kernel options"
196 bool "High memory support"
199 source kernel/time/Kconfig
200 source kernel/Kconfig.hz
201 source kernel/Kconfig.preempt
202 source "fs/Kconfig.binfmt"
204 # We optimistically allocate largepages from the VM, so make the limit
205 # large enough (16MB). This badly named config option is actually
207 config FORCE_MAX_ZONEORDER
210 default "9" if PPC_64K_PAGES
213 config HUGETLB_PAGE_SIZE_VARIABLE
215 depends on HUGETLB_PAGE
218 config MATH_EMULATION
219 bool "Math emulation"
220 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
222 Some PowerPC chips designed for embedded applications do not have
223 a floating-point unit and therefore do not implement the
224 floating-point instructions in the PowerPC instruction set. If you
225 say Y here, the kernel will include code to emulate a floating-point
226 unit, which will allow programs that use floating-point
229 config 8XX_MINIMAL_FPEMU
230 bool "Minimal math emulation for 8xx"
231 depends on 8xx && !MATH_EMULATION
233 Older arch/ppc kernels still emulated a few floating point
234 instructions such as load and store, even when full math
235 emulation is disabled. Say "Y" here if you want to preserve
238 It is recommended that you build a soft-float userspace instead.
241 bool "Enable IOMMU virtual merging"
245 Cause IO segments sent to a device for DMA to be merged virtually
246 by the IOMMU when they happen to have been allocated contiguously.
247 This doesn't add pressure to the IOMMU allocator. However, some
248 drivers don't support getting large merged segments coming back
251 Most drivers don't have this problem; it is safe to say Y here.
254 bool "Support for enabling/disabling CPUs"
255 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
257 Say Y here to be able to disable and re-enable individual
258 CPUs at runtime on SMP machines.
260 Say N if you are unsure.
262 config ARCH_ENABLE_MEMORY_HOTPLUG
266 bool "kexec system call (EXPERIMENTAL)"
267 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
269 kexec is a system call that implements the ability to shutdown your
270 current kernel, and to start another kernel. It is like a reboot
271 but it is independent of the system firmware. And like a reboot
272 you can start any kernel with it, not just Linux.
274 The name comes from the similarity to the exec system call.
276 It is an ongoing process to be certain the hardware in a machine
277 is properly shutdown, so do not be surprised if this code does not
278 initially work for you. It may help to enable device hotplugging
279 support. As of this writing the exact hardware interface is
280 strongly in flux, so no good recommendation can be made.
283 bool "Build a kdump crash kernel (EXPERIMENTAL)"
284 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
286 Build a kernel suitable for use as a kdump capture kernel.
287 The kernel will be linked at a different address than normal, and
288 so can only be used for Kdump.
290 Don't change this unless you know what you are doing.
293 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
294 default y if PPC_PREP
297 bool "Distribute interrupts on all CPUs by default"
298 depends on SMP && !MV64360
300 This option gives the kernel permission to distribute IRQs across
301 multiple CPUs. Saying N here will route all IRQs to the first
302 CPU. Generally saying Y is safe, although some problems have been
303 reported with SMP Power Macintoshes with this option enabled.
308 default y if SMP && PPC_PSERIES
313 depends on NEED_MULTIPLE_NODES
315 config ARCH_SELECT_MEMORY_MODEL
319 config ARCH_FLATMEM_ENABLE
321 depends on (PPC64 && !NUMA) || PPC32
323 config ARCH_SPARSEMEM_ENABLE
326 select SPARSEMEM_VMEMMAP_ENABLE
328 config ARCH_SPARSEMEM_DEFAULT
330 depends on (SMP && PPC_PSERIES) || PPC_PS3
332 config ARCH_POPULATES_NODE_MAP
337 config ARCH_MEMORY_PROBE
339 depends on MEMORY_HOTPLUG
341 # Some NUMA nodes have memory ranges that span
342 # other nodes. Even though a pfn is valid and
343 # between a node's start and end pfns, it may not
344 # reside on that node. See memmap_init_zone()
346 config NODES_SPAN_OTHER_NODES
348 depends on NEED_MULTIPLE_NODES
350 config PPC_HAS_HASH_64K
358 select PPC_HAS_HASH_64K
360 This option changes the kernel logical page size to 64k. On machines
361 without processor support for 64k pages, the kernel will simulate
362 them by loading each individual 4k page on demand transparently,
363 while on hardware with such support, it will be used to map
364 normal application pages.
366 config PPC_SUBPAGE_PROT
367 bool "Support setting protections for 4k subpages"
368 depends on PPC_64K_PAGES
370 This option adds support for a system call to allow user programs
371 to set access permissions (read/write, readonly, or no access)
372 on the 4k subpages of each 64k page.
375 bool "SMT (Hyperthreading) scheduler support"
376 depends on PPC64 && SMP
378 SMT scheduler support improves the CPU scheduler's decision making
379 when dealing with POWER5 cpus at a cost of slightly increased
380 overhead in some places. If unsure say N here.
382 config PROC_DEVICETREE
383 bool "Support for device tree in /proc"
386 This option adds a device-tree directory under /proc which contains
387 an image of the device tree that the kernel copies from Open
388 Firmware or other boot firmware. If unsure, say Y here.
391 bool "Default bootloader kernel arguments"
394 string "Initial kernel command string"
395 depends on CMDLINE_BOOL
396 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
398 On some platforms, there is currently no way for the boot loader to
399 pass arguments to the kernel. For these platforms, you can supply
400 some command-line options at build time by entering them here. In
401 most cases you will need to specify the root device here.
404 source kernel/power/Kconfig
408 bool "Enable seccomp to safely compute untrusted bytecode"
412 This kernel feature is useful for number crunching applications
413 that may need to compute untrusted bytecode during their
414 execution. By using pipes or other transports made available to
415 the process as file descriptors supporting the read/write
416 syscalls, it's possible to isolate those applications in
417 their own address space using seccomp. Once seccomp is
418 enabled via /proc/<pid>/seccomp, it cannot be disabled
419 and the task is only allowed to execute a few safe syscalls
420 defined by each seccomp mode.
422 If unsure, say Y. Only embedded should say N here.
424 config WANT_DEVICE_TREE
429 string "Static device tree source file"
430 depends on WANT_DEVICE_TREE
432 This specifies the device tree source (.dts) file to be
433 compiled and included when building the bootwrapper. If a
434 relative filename is given, then it will be relative to
435 arch/powerpc/boot/dts. If you are not using the bootwrapper,
436 or do not need to build a dts into the bootwrapper, this
439 For example, this is required when building a cuImage target
440 for an older U-Boot, which cannot pass a device tree itself.
441 Such a kernel will not work with a newer U-Boot that tries to
442 pass a device tree (unless you tell it not to). If your U-Boot
443 does not mention a device tree in "help bootm", then use the
444 cuImage target and specify a device tree here. Otherwise, use
445 the uImage target and leave this field blank.
451 default !PPC_ISERIES || PCI
456 bool "Support for ISA-bus hardware"
457 depends on PPC_PREP || PPC_CHRP
460 Find out whether you have ISA slots on your motherboard. ISA is the
461 name of a bus system, i.e. the way the CPU talks to the other stuff
462 inside your box. If you have an Apple machine, say N here; if you
463 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
464 you have an embedded board, consult your board documentation.
470 config GENERIC_ISA_DMA
472 depends on PPC64 || POWER4 || 6xx && !CPM2
475 config PPC_INDIRECT_PCI
478 default y if 40x || 44x
492 select PPC_INDIRECT_PCI
494 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
499 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
500 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
502 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
503 && !PPC_85xx && !PPC_86xx
504 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
505 default PCI_QSPAN if !4xx && !CPM2 && 8xx
506 select ARCH_SUPPORTS_MSI
508 Find out whether your system includes a PCI bus. PCI is the name of
509 a bus system, i.e. the way the CPU talks to the other stuff inside
510 your box. If you say Y here, the kernel will include drivers and
511 infrastructure code to support PCI bus devices.
521 depends on !4xx && !CPM2 && 8xx
524 Say Y here if you have a system based on a Motorola 8xx-series
525 embedded processor with a QSPAN PCI interface, otherwise say N.
529 depends on PCI && 8260
530 select PPC_INDIRECT_PCI
534 bool "Enable workaround for MPC826x erratum PCI 9"
535 depends on PCI_8260 && !8272
539 prompt "IDMA channel for PCI 9 workaround"
542 config 8260_PCI9_IDMA1
545 config 8260_PCI9_IDMA2
548 config 8260_PCI9_IDMA3
551 config 8260_PCI9_IDMA4
556 source "drivers/pci/pcie/Kconfig"
558 source "drivers/pci/Kconfig"
560 source "drivers/pcmcia/Kconfig"
562 source "drivers/pci/hotplug/Kconfig"
566 menu "Advanced setup"
569 config ADVANCED_OPTIONS
570 bool "Prompt for advanced kernel configuration options"
572 This option will enable prompting for a variety of advanced kernel
573 configuration options. These options can cause the kernel to not
574 work if they are set incorrectly, but can be used to optimize certain
575 aspects of kernel memory management.
577 Unless you know what you are doing, say N here.
579 comment "Default settings for advanced configuration options are used"
580 depends on !ADVANCED_OPTIONS
582 config HIGHMEM_START_BOOL
583 bool "Set high memory pool address"
584 depends on ADVANCED_OPTIONS && HIGHMEM
586 This option allows you to set the base address of the kernel virtual
587 area used to map high memory pages. This can be useful in
588 optimizing the layout of kernel virtual memory.
590 Say N here unless you know what you are doing.
593 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
596 config LOWMEM_SIZE_BOOL
597 bool "Set maximum low memory"
598 depends on ADVANCED_OPTIONS
600 This option allows you to set the maximum amount of memory which
601 will be used as "low memory", that is, memory which the kernel can
602 access directly, without having to set up a kernel virtual mapping.
603 This can be useful in optimizing the layout of kernel virtual
606 Say N here unless you know what you are doing.
609 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
612 config KERNEL_START_BOOL
613 bool "Set custom kernel base address"
614 depends on ADVANCED_OPTIONS
616 This option allows you to set the kernel virtual address at which
617 the kernel will map low memory (the kernel image will be linked at
618 this address). This can be useful in optimizing the virtual memory
619 layout of the system.
621 Say N here unless you know what you are doing.
624 hex "Virtual address of kernel base" if KERNEL_START_BOOL
627 config TASK_SIZE_BOOL
628 bool "Set custom user task size"
629 depends on ADVANCED_OPTIONS
631 This option allows you to set the amount of virtual address space
632 allocated to user tasks. This can be useful in optimizing the
633 virtual memory layout of the system.
635 Say N here unless you know what you are doing.
638 hex "Size of user task space" if TASK_SIZE_BOOL
639 default "0x80000000" if PPC_PREP || PPC_8xx
642 config CONSISTENT_START_BOOL
643 bool "Set custom consistent memory pool address"
644 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
646 This option allows you to set the base virtual address
647 of the consistent memory pool. This pool of virtual
648 memory is used to make consistent memory allocations.
650 config CONSISTENT_START
651 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
652 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
653 default "0xff100000" if NOT_COHERENT_CACHE
655 config CONSISTENT_SIZE_BOOL
656 bool "Set custom consistent memory pool size"
657 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
659 This option allows you to set the size of the
660 consistent memory pool. This pool of virtual memory
661 is used to make consistent memory allocations.
663 config CONSISTENT_SIZE
664 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
665 default "0x00200000" if NOT_COHERENT_CACHE
667 config BOOT_LOAD_BOOL
668 bool "Set the boot link/load address"
669 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
671 This option allows you to set the initial load address of the zImage
672 or zImage.initrd file. This can be useful if you are on a board
673 which has a small amount of memory.
675 Say N here unless you know what you are doing.
678 hex "Link/load address for booting" if BOOT_LOAD_BOOL
679 default "0x00400000" if 40x || 8xx || 8260
680 default "0x01000000" if 44x
684 bool "Pinned Kernel TLBs (860 ONLY)"
685 depends on ADVANCED_OPTIONS && 8xx
691 default "0xc000000000000000"
696 source "drivers/Kconfig"
700 # XXX source "arch/ppc/8xx_io/Kconfig"
702 # XXX source "arch/ppc/8260_io/Kconfig"
704 source "arch/powerpc/sysdev/qe_lib/Kconfig"
708 source "kernel/Kconfig.instrumentation"
710 source "arch/powerpc/Kconfig.debug"
712 source "security/Kconfig"
716 depends on COMPAT && KEYS
719 source "crypto/Kconfig"