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
148 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
151 config PPC_DCR_NATIVE
161 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
164 config PPC_OF_PLATFORM_PCI
167 depends on PPC64 # not supported on 32 bits yet
170 source "init/Kconfig"
172 source "arch/powerpc/sysdev/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.
348 config PPC_SUBPAGE_PROT
349 bool "Support setting protections for 4k subpages"
350 depends on PPC_64K_PAGES
352 This option adds support for a system call to allow user programs
353 to set access permissions (read/write, readonly, or no access)
354 on the 4k subpages of each 64k page.
357 bool "SMT (Hyperthreading) scheduler support"
358 depends on PPC64 && SMP
360 SMT scheduler support improves the CPU scheduler's decision making
361 when dealing with POWER5 cpus at a cost of slightly increased
362 overhead in some places. If unsure say N here.
364 config PROC_DEVICETREE
365 bool "Support for device tree in /proc"
368 This option adds a device-tree directory under /proc which contains
369 an image of the device tree that the kernel copies from Open
370 Firmware or other boot firmware. If unsure, say Y here.
373 bool "Default bootloader kernel arguments"
376 string "Initial kernel command string"
377 depends on CMDLINE_BOOL
378 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
380 On some platforms, there is currently no way for the boot loader to
381 pass arguments to the kernel. For these platforms, you can supply
382 some command-line options at build time by entering them here. In
383 most cases you will need to specify the root device here.
386 source kernel/power/Kconfig
390 bool "Enable seccomp to safely compute untrusted bytecode"
394 This kernel feature is useful for number crunching applications
395 that may need to compute untrusted bytecode during their
396 execution. By using pipes or other transports made available to
397 the process as file descriptors supporting the read/write
398 syscalls, it's possible to isolate those applications in
399 their own address space using seccomp. Once seccomp is
400 enabled via /proc/<pid>/seccomp, it cannot be disabled
401 and the task is only allowed to execute a few safe syscalls
402 defined by each seccomp mode.
404 If unsure, say Y. Only embedded should say N here.
406 config WANT_DEVICE_TREE
411 string "Static device tree source file"
412 depends on WANT_DEVICE_TREE
414 This specifies the device tree source (.dts) file to be
415 compiled and included when building the bootwrapper. If a
416 relative filename is given, then it will be relative to
417 arch/powerpc/boot/dts. If you are not using the bootwrapper,
418 or do not need to build a dts into the bootwrapper, this
421 For example, this is required when building a cuImage target
422 for an older U-Boot, which cannot pass a device tree itself.
423 Such a kernel will not work with a newer U-Boot that tries to
424 pass a device tree (unless you tell it not to). If your U-Boot
425 does not mention a device tree in "help bootm", then use the
426 cuImage target and specify a device tree here. Otherwise, use
427 the uImage target and leave this field blank.
433 default !PPC_ISERIES || PCI
438 bool "Support for ISA-bus hardware"
439 depends on PPC_PREP || PPC_CHRP
442 Find out whether you have ISA slots on your motherboard. ISA is the
443 name of a bus system, i.e. the way the CPU talks to the other stuff
444 inside your box. If you have an Apple machine, say N here; if you
445 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
446 you have an embedded board, consult your board documentation.
452 config GENERIC_ISA_DMA
454 depends on PPC64 || POWER4 || 6xx && !CPM2
457 config PPC_INDIRECT_PCI
460 default y if 40x || 44x
474 select PPC_INDIRECT_PCI
476 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
481 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
482 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
484 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
485 && !PPC_85xx && !PPC_86xx
486 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
487 default PCI_QSPAN if !4xx && !CPM2 && 8xx
488 select ARCH_SUPPORTS_MSI
490 Find out whether your system includes a PCI bus. PCI is the name of
491 a bus system, i.e. the way the CPU talks to the other stuff inside
492 your box. If you say Y here, the kernel will include drivers and
493 infrastructure code to support PCI bus devices.
503 depends on !4xx && !CPM2 && 8xx
506 Say Y here if you have a system based on a Motorola 8xx-series
507 embedded processor with a QSPAN PCI interface, otherwise say N.
511 depends on PCI && 8260
512 select PPC_INDIRECT_PCI
516 bool "Enable workaround for MPC826x erratum PCI 9"
517 depends on PCI_8260 && !8272
521 prompt "IDMA channel for PCI 9 workaround"
524 config 8260_PCI9_IDMA1
527 config 8260_PCI9_IDMA2
530 config 8260_PCI9_IDMA3
533 config 8260_PCI9_IDMA4
538 source "drivers/pci/pcie/Kconfig"
540 source "drivers/pci/Kconfig"
542 source "drivers/pcmcia/Kconfig"
544 source "drivers/pci/hotplug/Kconfig"
548 menu "Advanced setup"
551 config ADVANCED_OPTIONS
552 bool "Prompt for advanced kernel configuration options"
554 This option will enable prompting for a variety of advanced kernel
555 configuration options. These options can cause the kernel to not
556 work if they are set incorrectly, but can be used to optimize certain
557 aspects of kernel memory management.
559 Unless you know what you are doing, say N here.
561 comment "Default settings for advanced configuration options are used"
562 depends on !ADVANCED_OPTIONS
564 config HIGHMEM_START_BOOL
565 bool "Set high memory pool address"
566 depends on ADVANCED_OPTIONS && HIGHMEM
568 This option allows you to set the base address of the kernel virtual
569 area used to map high memory pages. This can be useful in
570 optimizing the layout of kernel virtual memory.
572 Say N here unless you know what you are doing.
575 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
578 config LOWMEM_SIZE_BOOL
579 bool "Set maximum low memory"
580 depends on ADVANCED_OPTIONS
582 This option allows you to set the maximum amount of memory which
583 will be used as "low memory", that is, memory which the kernel can
584 access directly, without having to set up a kernel virtual mapping.
585 This can be useful in optimizing the layout of kernel virtual
588 Say N here unless you know what you are doing.
591 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
594 config KERNEL_START_BOOL
595 bool "Set custom kernel base address"
596 depends on ADVANCED_OPTIONS
598 This option allows you to set the kernel virtual address at which
599 the kernel will map low memory (the kernel image will be linked at
600 this address). This can be useful in optimizing the virtual memory
601 layout of the system.
603 Say N here unless you know what you are doing.
606 hex "Virtual address of kernel base" if KERNEL_START_BOOL
609 config TASK_SIZE_BOOL
610 bool "Set custom user task size"
611 depends on ADVANCED_OPTIONS
613 This option allows you to set the amount of virtual address space
614 allocated to user tasks. This can be useful in optimizing the
615 virtual memory layout of the system.
617 Say N here unless you know what you are doing.
620 hex "Size of user task space" if TASK_SIZE_BOOL
621 default "0x80000000" if PPC_PREP || PPC_8xx
624 config CONSISTENT_START_BOOL
625 bool "Set custom consistent memory pool address"
626 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
628 This option allows you to set the base virtual address
629 of the consistent memory pool. This pool of virtual
630 memory is used to make consistent memory allocations.
632 config CONSISTENT_START
633 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
634 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
635 default "0xff100000" if NOT_COHERENT_CACHE
637 config CONSISTENT_SIZE_BOOL
638 bool "Set custom consistent memory pool size"
639 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
641 This option allows you to set the size of the
642 consistent memory pool. This pool of virtual memory
643 is used to make consistent memory allocations.
645 config CONSISTENT_SIZE
646 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
647 default "0x00200000" if NOT_COHERENT_CACHE
649 config BOOT_LOAD_BOOL
650 bool "Set the boot link/load address"
651 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
653 This option allows you to set the initial load address of the zImage
654 or zImage.initrd file. This can be useful if you are on a board
655 which has a small amount of memory.
657 Say N here unless you know what you are doing.
660 hex "Link/load address for booting" if BOOT_LOAD_BOOL
661 default "0x00400000" if 40x || 8xx || 8260
662 default "0x01000000" if 44x
666 bool "Pinned Kernel TLBs (860 ONLY)"
667 depends on ADVANCED_OPTIONS && 8xx
673 default "0xc000000000000000"
678 source "drivers/Kconfig"
682 # XXX source "arch/ppc/8xx_io/Kconfig"
684 # XXX source "arch/ppc/8260_io/Kconfig"
686 source "arch/powerpc/sysdev/qe_lib/Kconfig"
690 source "kernel/Kconfig.instrumentation"
692 source "arch/powerpc/Kconfig.debug"
694 source "security/Kconfig"
698 depends on COMPAT && KEYS
701 source "crypto/Kconfig"