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
49 config RWSEM_GENERIC_SPINLOCK
52 config RWSEM_XCHGADD_ALGORITHM
56 config ARCH_HAS_ILOG2_U32
60 config ARCH_HAS_ILOG2_U64
64 config GENERIC_HWEIGHT
68 config GENERIC_CALIBRATE_DELAY
72 config GENERIC_FIND_NEXT_BIT
76 config ARCH_NO_VIRT_TO_BUS
93 depends on COMPAT && SYSVIPC
96 # All PPC32s use generic nvram driver through ppc_md
101 config SCHED_NO_NO_OMIT_FRAME_POINTER
105 config ARCH_MAY_HAVE_PC_FDC
107 default !PPC_PSERIES || PCI
115 config PPC_UDBG_16550
119 config GENERIC_TBSYNC
121 default y if PPC32 && SMP
133 config SYS_SUPPORTS_APM_EMULATION
134 default y if PMAC_APM_EMU
137 config DEFAULT_UIMAGE
140 Used to allow a board to specify it wants a uImage built by default
145 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
148 config PPC_DCR_NATIVE
158 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
161 config PPC_OF_PLATFORM_PCI
164 depends on PPC64 # not supported on 32 bits yet
167 source "init/Kconfig"
169 source "arch/powerpc/sysdev/Kconfig"
170 source "arch/powerpc/platforms/Kconfig"
172 menu "Kernel options"
175 bool "High memory support"
178 source kernel/time/Kconfig
179 source kernel/Kconfig.hz
180 source kernel/Kconfig.preempt
181 source "fs/Kconfig.binfmt"
183 # We optimistically allocate largepages from the VM, so make the limit
184 # large enough (16MB). This badly named config option is actually
186 config FORCE_MAX_ZONEORDER
189 default "9" if PPC_64K_PAGES
192 config HUGETLB_PAGE_SIZE_VARIABLE
194 depends on HUGETLB_PAGE
197 config MATH_EMULATION
198 bool "Math emulation"
199 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
201 Some PowerPC chips designed for embedded applications do not have
202 a floating-point unit and therefore do not implement the
203 floating-point instructions in the PowerPC instruction set. If you
204 say Y here, the kernel will include code to emulate a floating-point
205 unit, which will allow programs that use floating-point
208 config 8XX_MINIMAL_FPEMU
209 bool "Minimal math emulation for 8xx"
210 depends on 8xx && !MATH_EMULATION
212 Older arch/ppc kernels still emulated a few floating point
213 instructions such as load and store, even when full math
214 emulation is disabled. Say "Y" here if you want to preserve
217 It is recommended that you build a soft-float userspace instead.
220 bool "Enable IOMMU virtual merging"
224 Cause IO segments sent to a device for DMA to be merged virtually
225 by the IOMMU when they happen to have been allocated contiguously.
226 This doesn't add pressure to the IOMMU allocator. However, some
227 drivers don't support getting large merged segments coming back
230 Most drivers don't have this problem; it is safe to say Y here.
233 bool "Support for enabling/disabling CPUs"
234 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
236 Say Y here to be able to disable and re-enable individual
237 CPUs at runtime on SMP machines.
239 Say N if you are unsure.
241 config ARCH_ENABLE_MEMORY_HOTPLUG
245 bool "kexec system call (EXPERIMENTAL)"
246 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
248 kexec is a system call that implements the ability to shutdown your
249 current kernel, and to start another kernel. It is like a reboot
250 but it is independent of the system firmware. And like a reboot
251 you can start any kernel with it, not just Linux.
253 The name comes from the similarity to the exec system call.
255 It is an ongoing process to be certain the hardware in a machine
256 is properly shutdown, so do not be surprised if this code does not
257 initially work for you. It may help to enable device hotplugging
258 support. As of this writing the exact hardware interface is
259 strongly in flux, so no good recommendation can be made.
262 bool "Build a kdump crash kernel (EXPERIMENTAL)"
263 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
265 Build a kernel suitable for use as a kdump capture kernel.
266 The kernel will be linked at a different address than normal, and
267 so can only be used for Kdump.
269 Don't change this unless you know what you are doing.
272 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
273 default y if PPC_PREP
276 bool "Distribute interrupts on all CPUs by default"
277 depends on SMP && !MV64360
279 This option gives the kernel permission to distribute IRQs across
280 multiple CPUs. Saying N here will route all IRQs to the first
281 CPU. Generally saying Y is safe, although some problems have been
282 reported with SMP Power Macintoshes with this option enabled.
287 default y if SMP && PPC_PSERIES
292 depends on NEED_MULTIPLE_NODES
294 config ARCH_SELECT_MEMORY_MODEL
298 config ARCH_FLATMEM_ENABLE
300 depends on (PPC64 && !NUMA) || PPC32
302 config ARCH_SPARSEMEM_ENABLE
305 select SPARSEMEM_VMEMMAP_ENABLE
307 config ARCH_SPARSEMEM_DEFAULT
309 depends on (SMP && PPC_PSERIES) || PPC_PS3
311 config ARCH_POPULATES_NODE_MAP
316 config ARCH_MEMORY_PROBE
318 depends on MEMORY_HOTPLUG
320 # Some NUMA nodes have memory ranges that span
321 # other nodes. Even though a pfn is valid and
322 # between a node's start and end pfns, it may not
323 # reside on that node. See memmap_init_zone()
325 config NODES_SPAN_OTHER_NODES
327 depends on NEED_MULTIPLE_NODES
329 config PPC_HAS_HASH_64K
337 select PPC_HAS_HASH_64K
339 This option changes the kernel logical page size to 64k. On machines
340 without processor support for 64k pages, the kernel will simulate
341 them by loading each individual 4k page on demand transparently,
342 while on hardware with such support, it will be used to map
343 normal application pages.
345 config PPC_SUBPAGE_PROT
346 bool "Support setting protections for 4k subpages"
347 depends on PPC_64K_PAGES
349 This option adds support for a system call to allow user programs
350 to set access permissions (read/write, readonly, or no access)
351 on the 4k subpages of each 64k page.
354 bool "SMT (Hyperthreading) scheduler support"
355 depends on PPC64 && SMP
357 SMT scheduler support improves the CPU scheduler's decision making
358 when dealing with POWER5 cpus at a cost of slightly increased
359 overhead in some places. If unsure say N here.
361 config PROC_DEVICETREE
362 bool "Support for device tree in /proc"
365 This option adds a device-tree directory under /proc which contains
366 an image of the device tree that the kernel copies from Open
367 Firmware or other boot firmware. If unsure, say Y here.
370 bool "Default bootloader kernel arguments"
373 string "Initial kernel command string"
374 depends on CMDLINE_BOOL
375 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
377 On some platforms, there is currently no way for the boot loader to
378 pass arguments to the kernel. For these platforms, you can supply
379 some command-line options at build time by entering them here. In
380 most cases you will need to specify the root device here.
383 source kernel/power/Kconfig
387 bool "Enable seccomp to safely compute untrusted bytecode"
391 This kernel feature is useful for number crunching applications
392 that may need to compute untrusted bytecode during their
393 execution. By using pipes or other transports made available to
394 the process as file descriptors supporting the read/write
395 syscalls, it's possible to isolate those applications in
396 their own address space using seccomp. Once seccomp is
397 enabled via /proc/<pid>/seccomp, it cannot be disabled
398 and the task is only allowed to execute a few safe syscalls
399 defined by each seccomp mode.
401 If unsure, say Y. Only embedded should say N here.
403 config WANT_DEVICE_TREE
408 string "Static device tree source file"
409 depends on WANT_DEVICE_TREE
411 This specifies the device tree source (.dts) file to be
412 compiled and included when building the bootwrapper. If a
413 relative filename is given, then it will be relative to
414 arch/powerpc/boot/dts. If you are not using the bootwrapper,
415 or do not need to build a dts into the bootwrapper, this
418 For example, this is required when building a cuImage target
419 for an older U-Boot, which cannot pass a device tree itself.
420 Such a kernel will not work with a newer U-Boot that tries to
421 pass a device tree (unless you tell it not to). If your U-Boot
422 does not mention a device tree in "help bootm", then use the
423 cuImage target and specify a device tree here. Otherwise, use
424 the uImage target and leave this field blank.
430 default !PPC_ISERIES || PCI
435 bool "Support for ISA-bus hardware"
436 depends on PPC_PREP || PPC_CHRP
439 Find out whether you have ISA slots on your motherboard. ISA is the
440 name of a bus system, i.e. the way the CPU talks to the other stuff
441 inside your box. If you have an Apple machine, say N here; if you
442 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
443 you have an embedded board, consult your board documentation.
449 config GENERIC_ISA_DMA
451 depends on PPC64 || POWER4 || 6xx && !CPM2
454 config PPC_INDIRECT_PCI
457 default y if 40x || 44x
471 select PPC_INDIRECT_PCI
473 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
478 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
479 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
481 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
482 && !PPC_85xx && !PPC_86xx
483 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
484 default PCI_QSPAN if !4xx && !CPM2 && 8xx
485 select ARCH_SUPPORTS_MSI
487 Find out whether your system includes a PCI bus. PCI is the name of
488 a bus system, i.e. the way the CPU talks to the other stuff inside
489 your box. If you say Y here, the kernel will include drivers and
490 infrastructure code to support PCI bus devices.
500 depends on !4xx && !CPM2 && 8xx
503 Say Y here if you have a system based on a Motorola 8xx-series
504 embedded processor with a QSPAN PCI interface, otherwise say N.
508 depends on PCI && 8260
509 select PPC_INDIRECT_PCI
513 bool "Enable workaround for MPC826x erratum PCI 9"
514 depends on PCI_8260 && !8272
518 prompt "IDMA channel for PCI 9 workaround"
521 config 8260_PCI9_IDMA1
524 config 8260_PCI9_IDMA2
527 config 8260_PCI9_IDMA3
530 config 8260_PCI9_IDMA4
535 source "drivers/pci/pcie/Kconfig"
537 source "drivers/pci/Kconfig"
539 source "drivers/pcmcia/Kconfig"
541 source "drivers/pci/hotplug/Kconfig"
545 menu "Advanced setup"
548 config ADVANCED_OPTIONS
549 bool "Prompt for advanced kernel configuration options"
551 This option will enable prompting for a variety of advanced kernel
552 configuration options. These options can cause the kernel to not
553 work if they are set incorrectly, but can be used to optimize certain
554 aspects of kernel memory management.
556 Unless you know what you are doing, say N here.
558 comment "Default settings for advanced configuration options are used"
559 depends on !ADVANCED_OPTIONS
561 config HIGHMEM_START_BOOL
562 bool "Set high memory pool address"
563 depends on ADVANCED_OPTIONS && HIGHMEM
565 This option allows you to set the base address of the kernel virtual
566 area used to map high memory pages. This can be useful in
567 optimizing the layout of kernel virtual memory.
569 Say N here unless you know what you are doing.
572 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
575 config LOWMEM_SIZE_BOOL
576 bool "Set maximum low memory"
577 depends on ADVANCED_OPTIONS
579 This option allows you to set the maximum amount of memory which
580 will be used as "low memory", that is, memory which the kernel can
581 access directly, without having to set up a kernel virtual mapping.
582 This can be useful in optimizing the layout of kernel virtual
585 Say N here unless you know what you are doing.
588 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
591 config KERNEL_START_BOOL
592 bool "Set custom kernel base address"
593 depends on ADVANCED_OPTIONS
595 This option allows you to set the kernel virtual address at which
596 the kernel will map low memory (the kernel image will be linked at
597 this address). This can be useful in optimizing the virtual memory
598 layout of the system.
600 Say N here unless you know what you are doing.
603 hex "Virtual address of kernel base" if KERNEL_START_BOOL
606 config TASK_SIZE_BOOL
607 bool "Set custom user task size"
608 depends on ADVANCED_OPTIONS
610 This option allows you to set the amount of virtual address space
611 allocated to user tasks. This can be useful in optimizing the
612 virtual memory layout of the system.
614 Say N here unless you know what you are doing.
617 hex "Size of user task space" if TASK_SIZE_BOOL
618 default "0x80000000" if PPC_PREP || PPC_8xx
621 config CONSISTENT_START_BOOL
622 bool "Set custom consistent memory pool address"
623 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
625 This option allows you to set the base virtual address
626 of the consistent memory pool. This pool of virtual
627 memory is used to make consistent memory allocations.
629 config CONSISTENT_START
630 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
631 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
632 default "0xff100000" if NOT_COHERENT_CACHE
634 config CONSISTENT_SIZE_BOOL
635 bool "Set custom consistent memory pool size"
636 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
638 This option allows you to set the size of the
639 consistent memory pool. This pool of virtual memory
640 is used to make consistent memory allocations.
642 config CONSISTENT_SIZE
643 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
644 default "0x00200000" if NOT_COHERENT_CACHE
646 config BOOT_LOAD_BOOL
647 bool "Set the boot link/load address"
648 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
650 This option allows you to set the initial load address of the zImage
651 or zImage.initrd file. This can be useful if you are on a board
652 which has a small amount of memory.
654 Say N here unless you know what you are doing.
657 hex "Link/load address for booting" if BOOT_LOAD_BOOL
658 default "0x00400000" if 40x || 8xx || 8260
659 default "0x01000000" if 44x
663 bool "Pinned Kernel TLBs (860 ONLY)"
664 depends on ADVANCED_OPTIONS && 8xx
670 default "0xc000000000000000"
675 source "drivers/Kconfig"
679 # XXX source "arch/ppc/8xx_io/Kconfig"
681 # XXX source "arch/ppc/8260_io/Kconfig"
683 source "arch/powerpc/sysdev/qe_lib/Kconfig"
687 source "kernel/Kconfig.instrumentation"
689 source "arch/powerpc/Kconfig.debug"
691 source "security/Kconfig"
695 depends on COMPAT && KEYS
698 source "crypto/Kconfig"