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 PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
159 config PPC_DCR_NATIVE
169 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
172 config PPC_OF_PLATFORM_PCI
175 depends on PPC64 # not supported on 32 bits yet
178 source "init/Kconfig"
180 source "arch/powerpc/sysdev/Kconfig"
181 source "arch/powerpc/platforms/Kconfig"
183 menu "Kernel options"
186 bool "High memory support"
189 source kernel/time/Kconfig
190 source kernel/Kconfig.hz
191 source kernel/Kconfig.preempt
192 source "fs/Kconfig.binfmt"
194 # We optimistically allocate largepages from the VM, so make the limit
195 # large enough (16MB). This badly named config option is actually
197 config FORCE_MAX_ZONEORDER
200 default "9" if PPC_64K_PAGES
203 config HUGETLB_PAGE_SIZE_VARIABLE
205 depends on HUGETLB_PAGE
208 config MATH_EMULATION
209 bool "Math emulation"
210 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
212 Some PowerPC chips designed for embedded applications do not have
213 a floating-point unit and therefore do not implement the
214 floating-point instructions in the PowerPC instruction set. If you
215 say Y here, the kernel will include code to emulate a floating-point
216 unit, which will allow programs that use floating-point
219 config 8XX_MINIMAL_FPEMU
220 bool "Minimal math emulation for 8xx"
221 depends on 8xx && !MATH_EMULATION
223 Older arch/ppc kernels still emulated a few floating point
224 instructions such as load and store, even when full math
225 emulation is disabled. Say "Y" here if you want to preserve
228 It is recommended that you build a soft-float userspace instead.
231 bool "Enable IOMMU virtual merging"
235 Cause IO segments sent to a device for DMA to be merged virtually
236 by the IOMMU when they happen to have been allocated contiguously.
237 This doesn't add pressure to the IOMMU allocator. However, some
238 drivers don't support getting large merged segments coming back
241 Most drivers don't have this problem; it is safe to say Y here.
244 bool "Support for enabling/disabling CPUs"
245 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
247 Say Y here to be able to disable and re-enable individual
248 CPUs at runtime on SMP machines.
250 Say N if you are unsure.
252 config ARCH_ENABLE_MEMORY_HOTPLUG
256 bool "kexec system call (EXPERIMENTAL)"
257 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
259 kexec is a system call that implements the ability to shutdown your
260 current kernel, and to start another kernel. It is like a reboot
261 but it is independent of the system firmware. And like a reboot
262 you can start any kernel with it, not just Linux.
264 The name comes from the similarity to the exec system call.
266 It is an ongoing process to be certain the hardware in a machine
267 is properly shutdown, so do not be surprised if this code does not
268 initially work for you. It may help to enable device hotplugging
269 support. As of this writing the exact hardware interface is
270 strongly in flux, so no good recommendation can be made.
273 bool "Build a kdump crash kernel (EXPERIMENTAL)"
274 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
276 Build a kernel suitable for use as a kdump capture kernel.
277 The kernel will be linked at a different address than normal, and
278 so can only be used for Kdump.
280 Don't change this unless you know what you are doing.
283 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
284 default y if PPC_PREP
287 bool "Distribute interrupts on all CPUs by default"
288 depends on SMP && !MV64360
290 This option gives the kernel permission to distribute IRQs across
291 multiple CPUs. Saying N here will route all IRQs to the first
292 CPU. Generally saying Y is safe, although some problems have been
293 reported with SMP Power Macintoshes with this option enabled.
298 default y if SMP && PPC_PSERIES
303 depends on NEED_MULTIPLE_NODES
305 config ARCH_SELECT_MEMORY_MODEL
309 config ARCH_FLATMEM_ENABLE
311 depends on (PPC64 && !NUMA) || PPC32
313 config ARCH_SPARSEMEM_ENABLE
316 select SPARSEMEM_VMEMMAP_ENABLE
318 config ARCH_SPARSEMEM_DEFAULT
320 depends on (SMP && PPC_PSERIES) || PPC_PS3
322 config ARCH_POPULATES_NODE_MAP
327 config ARCH_MEMORY_PROBE
329 depends on MEMORY_HOTPLUG
331 # Some NUMA nodes have memory ranges that span
332 # other nodes. Even though a pfn is valid and
333 # between a node's start and end pfns, it may not
334 # reside on that node. See memmap_init_zone()
336 config NODES_SPAN_OTHER_NODES
338 depends on NEED_MULTIPLE_NODES
340 config PPC_HAS_HASH_64K
348 select PPC_HAS_HASH_64K
350 This option changes the kernel logical page size to 64k. On machines
351 without processor support for 64k pages, the kernel will simulate
352 them by loading each individual 4k page on demand transparently,
353 while on hardware with such support, it will be used to map
354 normal application pages.
356 config PPC_SUBPAGE_PROT
357 bool "Support setting protections for 4k subpages"
358 depends on PPC_64K_PAGES
360 This option adds support for a system call to allow user programs
361 to set access permissions (read/write, readonly, or no access)
362 on the 4k subpages of each 64k page.
365 bool "SMT (Hyperthreading) scheduler support"
366 depends on PPC64 && SMP
368 SMT scheduler support improves the CPU scheduler's decision making
369 when dealing with POWER5 cpus at a cost of slightly increased
370 overhead in some places. If unsure say N here.
372 config PROC_DEVICETREE
373 bool "Support for device tree in /proc"
376 This option adds a device-tree directory under /proc which contains
377 an image of the device tree that the kernel copies from Open
378 Firmware or other boot firmware. If unsure, say Y here.
381 bool "Default bootloader kernel arguments"
384 string "Initial kernel command string"
385 depends on CMDLINE_BOOL
386 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
388 On some platforms, there is currently no way for the boot loader to
389 pass arguments to the kernel. For these platforms, you can supply
390 some command-line options at build time by entering them here. In
391 most cases you will need to specify the root device here.
394 source kernel/power/Kconfig
398 bool "Enable seccomp to safely compute untrusted bytecode"
402 This kernel feature is useful for number crunching applications
403 that may need to compute untrusted bytecode during their
404 execution. By using pipes or other transports made available to
405 the process as file descriptors supporting the read/write
406 syscalls, it's possible to isolate those applications in
407 their own address space using seccomp. Once seccomp is
408 enabled via /proc/<pid>/seccomp, it cannot be disabled
409 and the task is only allowed to execute a few safe syscalls
410 defined by each seccomp mode.
412 If unsure, say Y. Only embedded should say N here.
414 config WANT_DEVICE_TREE
419 string "Static device tree source file"
420 depends on WANT_DEVICE_TREE
422 This specifies the device tree source (.dts) file to be
423 compiled and included when building the bootwrapper. If a
424 relative filename is given, then it will be relative to
425 arch/powerpc/boot/dts. If you are not using the bootwrapper,
426 or do not need to build a dts into the bootwrapper, this
429 For example, this is required when building a cuImage target
430 for an older U-Boot, which cannot pass a device tree itself.
431 Such a kernel will not work with a newer U-Boot that tries to
432 pass a device tree (unless you tell it not to). If your U-Boot
433 does not mention a device tree in "help bootm", then use the
434 cuImage target and specify a device tree here. Otherwise, use
435 the uImage target and leave this field blank.
441 default !PPC_ISERIES || PCI
446 bool "Support for ISA-bus hardware"
447 depends on PPC_PREP || PPC_CHRP
450 Find out whether you have ISA slots on your motherboard. ISA is the
451 name of a bus system, i.e. the way the CPU talks to the other stuff
452 inside your box. If you have an Apple machine, say N here; if you
453 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
454 you have an embedded board, consult your board documentation.
460 config GENERIC_ISA_DMA
462 depends on PPC64 || POWER4 || 6xx && !CPM2
465 config PPC_INDIRECT_PCI
468 default y if 40x || 44x
482 select PPC_INDIRECT_PCI
484 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
489 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
490 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
492 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
493 && !PPC_85xx && !PPC_86xx
494 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
495 default PCI_QSPAN if !4xx && !CPM2 && 8xx
496 select ARCH_SUPPORTS_MSI
498 Find out whether your system includes a PCI bus. PCI is the name of
499 a bus system, i.e. the way the CPU talks to the other stuff inside
500 your box. If you say Y here, the kernel will include drivers and
501 infrastructure code to support PCI bus devices.
511 depends on !4xx && !CPM2 && 8xx
514 Say Y here if you have a system based on a Motorola 8xx-series
515 embedded processor with a QSPAN PCI interface, otherwise say N.
519 depends on PCI && 8260
520 select PPC_INDIRECT_PCI
524 bool "Enable workaround for MPC826x erratum PCI 9"
525 depends on PCI_8260 && !8272
529 prompt "IDMA channel for PCI 9 workaround"
532 config 8260_PCI9_IDMA1
535 config 8260_PCI9_IDMA2
538 config 8260_PCI9_IDMA3
541 config 8260_PCI9_IDMA4
546 source "drivers/pci/pcie/Kconfig"
548 source "drivers/pci/Kconfig"
550 source "drivers/pcmcia/Kconfig"
552 source "drivers/pci/hotplug/Kconfig"
556 menu "Advanced setup"
559 config ADVANCED_OPTIONS
560 bool "Prompt for advanced kernel configuration options"
562 This option will enable prompting for a variety of advanced kernel
563 configuration options. These options can cause the kernel to not
564 work if they are set incorrectly, but can be used to optimize certain
565 aspects of kernel memory management.
567 Unless you know what you are doing, say N here.
569 comment "Default settings for advanced configuration options are used"
570 depends on !ADVANCED_OPTIONS
572 config HIGHMEM_START_BOOL
573 bool "Set high memory pool address"
574 depends on ADVANCED_OPTIONS && HIGHMEM
576 This option allows you to set the base address of the kernel virtual
577 area used to map high memory pages. This can be useful in
578 optimizing the layout of kernel virtual memory.
580 Say N here unless you know what you are doing.
583 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
586 config LOWMEM_SIZE_BOOL
587 bool "Set maximum low memory"
588 depends on ADVANCED_OPTIONS
590 This option allows you to set the maximum amount of memory which
591 will be used as "low memory", that is, memory which the kernel can
592 access directly, without having to set up a kernel virtual mapping.
593 This can be useful in optimizing the layout of kernel virtual
596 Say N here unless you know what you are doing.
599 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
602 config KERNEL_START_BOOL
603 bool "Set custom kernel base address"
604 depends on ADVANCED_OPTIONS
606 This option allows you to set the kernel virtual address at which
607 the kernel will map low memory (the kernel image will be linked at
608 this address). This can be useful in optimizing the virtual memory
609 layout of the system.
611 Say N here unless you know what you are doing.
614 hex "Virtual address of kernel base" if KERNEL_START_BOOL
617 config TASK_SIZE_BOOL
618 bool "Set custom user task size"
619 depends on ADVANCED_OPTIONS
621 This option allows you to set the amount of virtual address space
622 allocated to user tasks. This can be useful in optimizing the
623 virtual memory layout of the system.
625 Say N here unless you know what you are doing.
628 hex "Size of user task space" if TASK_SIZE_BOOL
629 default "0x80000000" if PPC_PREP || PPC_8xx
632 config CONSISTENT_START_BOOL
633 bool "Set custom consistent memory pool address"
634 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
636 This option allows you to set the base virtual address
637 of the consistent memory pool. This pool of virtual
638 memory is used to make consistent memory allocations.
640 config CONSISTENT_START
641 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
642 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
643 default "0xff100000" if NOT_COHERENT_CACHE
645 config CONSISTENT_SIZE_BOOL
646 bool "Set custom consistent memory pool size"
647 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
649 This option allows you to set the size of the
650 consistent memory pool. This pool of virtual memory
651 is used to make consistent memory allocations.
653 config CONSISTENT_SIZE
654 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
655 default "0x00200000" if NOT_COHERENT_CACHE
657 config BOOT_LOAD_BOOL
658 bool "Set the boot link/load address"
659 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
661 This option allows you to set the initial load address of the zImage
662 or zImage.initrd file. This can be useful if you are on a board
663 which has a small amount of memory.
665 Say N here unless you know what you are doing.
668 hex "Link/load address for booting" if BOOT_LOAD_BOOL
669 default "0x00400000" if 40x || 8xx || 8260
670 default "0x01000000" if 44x
674 bool "Pinned Kernel TLBs (860 ONLY)"
675 depends on ADVANCED_OPTIONS && 8xx
681 default "0xc000000000000000"
686 source "drivers/Kconfig"
690 # XXX source "arch/ppc/8xx_io/Kconfig"
692 # XXX source "arch/ppc/8260_io/Kconfig"
694 source "arch/powerpc/sysdev/qe_lib/Kconfig"
698 source "kernel/Kconfig.instrumentation"
700 source "arch/powerpc/Kconfig.debug"
702 source "security/Kconfig"
706 depends on COMPAT && KEYS
709 source "crypto/Kconfig"