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 GENERIC_LOCKBREAK
59 depends on SMP && PREEMPT
61 config ARCH_HAS_ILOG2_U32
65 config ARCH_HAS_ILOG2_U64
69 config GENERIC_HWEIGHT
73 config GENERIC_CALIBRATE_DELAY
77 config GENERIC_FIND_NEXT_BIT
81 config ARCH_NO_VIRT_TO_BUS
98 depends on COMPAT && SYSVIPC
101 # All PPC32s use generic nvram driver through ppc_md
106 config SCHED_NO_NO_OMIT_FRAME_POINTER
110 config ARCH_MAY_HAVE_PC_FDC
112 default !PPC_PSERIES || PCI
120 config PPC_UDBG_16550
124 config GENERIC_TBSYNC
126 default y if PPC32 && SMP
138 config SYS_SUPPORTS_APM_EMULATION
139 default y if PMAC_APM_EMU
142 config DEFAULT_UIMAGE
145 Used to allow a board to specify it wants a uImage built by default
150 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
153 config PPC_DCR_NATIVE
163 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
166 config PPC_OF_PLATFORM_PCI
168 depends on PPC64 # not supported on 32 bits yet
171 source "init/Kconfig"
173 source "arch/powerpc/platforms/Kconfig"
175 menu "Kernel options"
178 bool "High memory support"
181 source kernel/time/Kconfig
182 source kernel/Kconfig.hz
183 source kernel/Kconfig.preempt
184 source "fs/Kconfig.binfmt"
186 # We optimistically allocate largepages from the VM, so make the limit
187 # large enough (16MB). This badly named config option is actually
189 config FORCE_MAX_ZONEORDER
192 default "9" if PPC_64K_PAGES
195 config HUGETLB_PAGE_SIZE_VARIABLE
197 depends on HUGETLB_PAGE
200 config MATH_EMULATION
201 bool "Math emulation"
202 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
204 Some PowerPC chips designed for embedded applications do not have
205 a floating-point unit and therefore do not implement the
206 floating-point instructions in the PowerPC instruction set. If you
207 say Y here, the kernel will include code to emulate a floating-point
208 unit, which will allow programs that use floating-point
211 config 8XX_MINIMAL_FPEMU
212 bool "Minimal math emulation for 8xx"
213 depends on 8xx && !MATH_EMULATION
215 Older arch/ppc kernels still emulated a few floating point
216 instructions such as load and store, even when full math
217 emulation is disabled. Say "Y" here if you want to preserve
220 It is recommended that you build a soft-float userspace instead.
223 bool "Enable IOMMU virtual merging"
227 Cause IO segments sent to a device for DMA to be merged virtually
228 by the IOMMU when they happen to have been allocated contiguously.
229 This doesn't add pressure to the IOMMU allocator. However, some
230 drivers don't support getting large merged segments coming back
233 Most drivers don't have this problem; it is safe to say Y here.
236 bool "Support for enabling/disabling CPUs"
237 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
239 Say Y here to be able to disable and re-enable individual
240 CPUs at runtime on SMP machines.
242 Say N if you are unsure.
244 config ARCH_ENABLE_MEMORY_HOTPLUG
248 bool "kexec system call (EXPERIMENTAL)"
249 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
251 kexec is a system call that implements the ability to shutdown your
252 current kernel, and to start another kernel. It is like a reboot
253 but it is independent of the system firmware. And like a reboot
254 you can start any kernel with it, not just Linux.
256 The name comes from the similarity to the exec system call.
258 It is an ongoing process to be certain the hardware in a machine
259 is properly shutdown, so do not be surprised if this code does not
260 initially work for you. It may help to enable device hotplugging
261 support. As of this writing the exact hardware interface is
262 strongly in flux, so no good recommendation can be made.
265 bool "Build a kdump crash kernel (EXPERIMENTAL)"
266 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
268 Build a kernel suitable for use as a kdump capture kernel.
269 The kernel will be linked at a different address than normal, and
270 so can only be used for Kdump.
272 Don't change this unless you know what you are doing.
275 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
276 default y if PPC_PREP
279 bool "Distribute interrupts on all CPUs by default"
280 depends on SMP && !MV64360
282 This option gives the kernel permission to distribute IRQs across
283 multiple CPUs. Saying N here will route all IRQs to the first
284 CPU. Generally saying Y is safe, although some problems have been
285 reported with SMP Power Macintoshes with this option enabled.
290 default y if SMP && PPC_PSERIES
295 depends on NEED_MULTIPLE_NODES
297 config ARCH_SELECT_MEMORY_MODEL
301 config ARCH_FLATMEM_ENABLE
303 depends on (PPC64 && !NUMA) || PPC32
305 config ARCH_SPARSEMEM_ENABLE
308 select SPARSEMEM_VMEMMAP_ENABLE
310 config ARCH_SPARSEMEM_DEFAULT
312 depends on (SMP && PPC_PSERIES) || PPC_PS3
314 config ARCH_POPULATES_NODE_MAP
319 config ARCH_MEMORY_PROBE
321 depends on MEMORY_HOTPLUG
323 # Some NUMA nodes have memory ranges that span
324 # other nodes. Even though a pfn is valid and
325 # between a node's start and end pfns, it may not
326 # reside on that node. See memmap_init_zone()
328 config NODES_SPAN_OTHER_NODES
330 depends on NEED_MULTIPLE_NODES
332 config PPC_HAS_HASH_64K
340 select PPC_HAS_HASH_64K
342 This option changes the kernel logical page size to 64k. On machines
343 without processor support for 64k pages, the kernel will simulate
344 them by loading each individual 4k page on demand transparently,
345 while on hardware with such support, it will be used to map
346 normal application pages.
349 bool "SMT (Hyperthreading) scheduler support"
350 depends on PPC64 && SMP
352 SMT scheduler support improves the CPU scheduler's decision making
353 when dealing with POWER5 cpus at a cost of slightly increased
354 overhead in some places. If unsure say N here.
356 config PROC_DEVICETREE
357 bool "Support for device tree in /proc"
360 This option adds a device-tree directory under /proc which contains
361 an image of the device tree that the kernel copies from Open
362 Firmware or other boot firmware. If unsure, say Y here.
365 bool "Default bootloader kernel arguments"
368 string "Initial kernel command string"
369 depends on CMDLINE_BOOL
370 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
372 On some platforms, there is currently no way for the boot loader to
373 pass arguments to the kernel. For these platforms, you can supply
374 some command-line options at build time by entering them here. In
375 most cases you will need to specify the root device here.
378 source kernel/power/Kconfig
382 bool "Enable seccomp to safely compute untrusted bytecode"
386 This kernel feature is useful for number crunching applications
387 that may need to compute untrusted bytecode during their
388 execution. By using pipes or other transports made available to
389 the process as file descriptors supporting the read/write
390 syscalls, it's possible to isolate those applications in
391 their own address space using seccomp. Once seccomp is
392 enabled via /proc/<pid>/seccomp, it cannot be disabled
393 and the task is only allowed to execute a few safe syscalls
394 defined by each seccomp mode.
396 If unsure, say Y. Only embedded should say N here.
398 config WANT_DEVICE_TREE
403 string "Static device tree source file"
404 depends on WANT_DEVICE_TREE
406 This specifies the device tree source (.dts) file to be
407 compiled and included when building the bootwrapper. If a
408 relative filename is given, then it will be relative to
409 arch/powerpc/boot/dts. If you are not using the bootwrapper,
410 or do not need to build a dts into the bootwrapper, this
413 For example, this is required when building a cuImage target
414 for an older U-Boot, which cannot pass a device tree itself.
415 Such a kernel will not work with a newer U-Boot that tries to
416 pass a device tree (unless you tell it not to). If your U-Boot
417 does not mention a device tree in "help bootm", then use the
418 cuImage target and specify a device tree here. Otherwise, use
419 the uImage target and leave this field blank.
430 bool "Support for ISA-bus hardware"
431 depends on PPC_PREP || PPC_CHRP
434 Find out whether you have ISA slots on your motherboard. ISA is the
435 name of a bus system, i.e. the way the CPU talks to the other stuff
436 inside your box. If you have an Apple machine, say N here; if you
437 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
438 you have an embedded board, consult your board documentation.
444 config GENERIC_ISA_DMA
446 depends on PPC64 || POWER4 || 6xx && !CPM2
449 config PPC_INDIRECT_PCI
452 default y if 40x || 44x
466 select PPC_INDIRECT_PCI
468 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
473 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
474 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
476 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
477 && !PPC_85xx && !PPC_86xx
478 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
479 default PCI_QSPAN if !4xx && !CPM2 && 8xx
480 select ARCH_SUPPORTS_MSI
482 Find out whether your system includes a PCI bus. PCI is the name of
483 a bus system, i.e. the way the CPU talks to the other stuff inside
484 your box. If you say Y here, the kernel will include drivers and
485 infrastructure code to support PCI bus devices.
495 depends on !4xx && !CPM2 && 8xx
498 Say Y here if you have a system based on a Motorola 8xx-series
499 embedded processor with a QSPAN PCI interface, otherwise say N.
503 depends on PCI && 8260
504 select PPC_INDIRECT_PCI
508 bool "Enable workaround for MPC826x erratum PCI 9"
509 depends on PCI_8260 && !8272
513 prompt "IDMA channel for PCI 9 workaround"
516 config 8260_PCI9_IDMA1
519 config 8260_PCI9_IDMA2
522 config 8260_PCI9_IDMA3
525 config 8260_PCI9_IDMA4
530 source "drivers/pci/pcie/Kconfig"
532 source "drivers/pci/Kconfig"
534 source "drivers/pcmcia/Kconfig"
536 source "drivers/pci/hotplug/Kconfig"
540 menu "Advanced setup"
543 config ADVANCED_OPTIONS
544 bool "Prompt for advanced kernel configuration options"
546 This option will enable prompting for a variety of advanced kernel
547 configuration options. These options can cause the kernel to not
548 work if they are set incorrectly, but can be used to optimize certain
549 aspects of kernel memory management.
551 Unless you know what you are doing, say N here.
553 comment "Default settings for advanced configuration options are used"
554 depends on !ADVANCED_OPTIONS
556 config HIGHMEM_START_BOOL
557 bool "Set high memory pool address"
558 depends on ADVANCED_OPTIONS && HIGHMEM
560 This option allows you to set the base address of the kernel virtual
561 area used to map high memory pages. This can be useful in
562 optimizing the layout of kernel virtual memory.
564 Say N here unless you know what you are doing.
567 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
570 config LOWMEM_SIZE_BOOL
571 bool "Set maximum low memory"
572 depends on ADVANCED_OPTIONS
574 This option allows you to set the maximum amount of memory which
575 will be used as "low memory", that is, memory which the kernel can
576 access directly, without having to set up a kernel virtual mapping.
577 This can be useful in optimizing the layout of kernel virtual
580 Say N here unless you know what you are doing.
583 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
586 config KERNEL_START_BOOL
587 bool "Set custom kernel base address"
588 depends on ADVANCED_OPTIONS
590 This option allows you to set the kernel virtual address at which
591 the kernel will map low memory (the kernel image will be linked at
592 this address). This can be useful in optimizing the virtual memory
593 layout of the system.
595 Say N here unless you know what you are doing.
598 hex "Virtual address of kernel base" if KERNEL_START_BOOL
601 config TASK_SIZE_BOOL
602 bool "Set custom user task size"
603 depends on ADVANCED_OPTIONS
605 This option allows you to set the amount of virtual address space
606 allocated to user tasks. This can be useful in optimizing the
607 virtual memory layout of the system.
609 Say N here unless you know what you are doing.
612 hex "Size of user task space" if TASK_SIZE_BOOL
613 default "0x80000000" if PPC_PREP || PPC_8xx
616 config CONSISTENT_START_BOOL
617 bool "Set custom consistent memory pool address"
618 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
620 This option allows you to set the base virtual address
621 of the consistent memory pool. This pool of virtual
622 memory is used to make consistent memory allocations.
624 config CONSISTENT_START
625 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
626 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
627 default "0xff100000" if NOT_COHERENT_CACHE
629 config CONSISTENT_SIZE_BOOL
630 bool "Set custom consistent memory pool size"
631 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
633 This option allows you to set the size of the
634 consistent memory pool. This pool of virtual memory
635 is used to make consistent memory allocations.
637 config CONSISTENT_SIZE
638 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
639 default "0x00200000" if NOT_COHERENT_CACHE
641 config BOOT_LOAD_BOOL
642 bool "Set the boot link/load address"
643 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
645 This option allows you to set the initial load address of the zImage
646 or zImage.initrd file. This can be useful if you are on a board
647 which has a small amount of memory.
649 Say N here unless you know what you are doing.
652 hex "Link/load address for booting" if BOOT_LOAD_BOOL
653 default "0x00400000" if 40x || 8xx || 8260
654 default "0x01000000" if 44x
658 bool "Pinned Kernel TLBs (860 ONLY)"
659 depends on ADVANCED_OPTIONS && 8xx
665 default "0xc000000000000000"
670 source "drivers/Kconfig"
674 # XXX source "arch/ppc/8xx_io/Kconfig"
676 # XXX source "arch/ppc/8260_io/Kconfig"
678 source "arch/powerpc/sysdev/qe_lib/Kconfig"
682 source "kernel/Kconfig.instrumentation"
684 source "arch/powerpc/Kconfig.debug"
686 source "security/Kconfig"
690 depends on COMPAT && KEYS
693 source "crypto/Kconfig"