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/platforms/Kconfig"
171 menu "Kernel options"
174 bool "High memory support"
177 source kernel/time/Kconfig
178 source kernel/Kconfig.hz
179 source kernel/Kconfig.preempt
180 source "fs/Kconfig.binfmt"
182 # We optimistically allocate largepages from the VM, so make the limit
183 # large enough (16MB). This badly named config option is actually
185 config FORCE_MAX_ZONEORDER
188 default "9" if PPC_64K_PAGES
191 config HUGETLB_PAGE_SIZE_VARIABLE
193 depends on HUGETLB_PAGE
196 config MATH_EMULATION
197 bool "Math emulation"
198 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
200 Some PowerPC chips designed for embedded applications do not have
201 a floating-point unit and therefore do not implement the
202 floating-point instructions in the PowerPC instruction set. If you
203 say Y here, the kernel will include code to emulate a floating-point
204 unit, which will allow programs that use floating-point
207 config 8XX_MINIMAL_FPEMU
208 bool "Minimal math emulation for 8xx"
209 depends on 8xx && !MATH_EMULATION
211 Older arch/ppc kernels still emulated a few floating point
212 instructions such as load and store, even when full math
213 emulation is disabled. Say "Y" here if you want to preserve
216 It is recommended that you build a soft-float userspace instead.
219 bool "Enable IOMMU virtual merging"
223 Cause IO segments sent to a device for DMA to be merged virtually
224 by the IOMMU when they happen to have been allocated contiguously.
225 This doesn't add pressure to the IOMMU allocator. However, some
226 drivers don't support getting large merged segments coming back
229 Most drivers don't have this problem; it is safe to say Y here.
232 bool "Support for enabling/disabling CPUs"
233 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
235 Say Y here to be able to disable and re-enable individual
236 CPUs at runtime on SMP machines.
238 Say N if you are unsure.
240 config ARCH_ENABLE_MEMORY_HOTPLUG
244 bool "kexec system call (EXPERIMENTAL)"
245 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
247 kexec is a system call that implements the ability to shutdown your
248 current kernel, and to start another kernel. It is like a reboot
249 but it is independent of the system firmware. And like a reboot
250 you can start any kernel with it, not just Linux.
252 The name comes from the similarity to the exec system call.
254 It is an ongoing process to be certain the hardware in a machine
255 is properly shutdown, so do not be surprised if this code does not
256 initially work for you. It may help to enable device hotplugging
257 support. As of this writing the exact hardware interface is
258 strongly in flux, so no good recommendation can be made.
261 bool "Build a kdump crash kernel (EXPERIMENTAL)"
262 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
264 Build a kernel suitable for use as a kdump capture kernel.
265 The kernel will be linked at a different address than normal, and
266 so can only be used for Kdump.
268 Don't change this unless you know what you are doing.
271 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
272 default y if PPC_PREP
275 bool "Distribute interrupts on all CPUs by default"
276 depends on SMP && !MV64360
278 This option gives the kernel permission to distribute IRQs across
279 multiple CPUs. Saying N here will route all IRQs to the first
280 CPU. Generally saying Y is safe, although some problems have been
281 reported with SMP Power Macintoshes with this option enabled.
286 default y if SMP && PPC_PSERIES
291 depends on NEED_MULTIPLE_NODES
293 config ARCH_SELECT_MEMORY_MODEL
297 config ARCH_FLATMEM_ENABLE
299 depends on (PPC64 && !NUMA) || PPC32
301 config ARCH_SPARSEMEM_ENABLE
304 select SPARSEMEM_VMEMMAP_ENABLE
306 config ARCH_SPARSEMEM_DEFAULT
308 depends on (SMP && PPC_PSERIES) || PPC_PS3
310 config ARCH_POPULATES_NODE_MAP
315 config ARCH_MEMORY_PROBE
317 depends on MEMORY_HOTPLUG
319 # Some NUMA nodes have memory ranges that span
320 # other nodes. Even though a pfn is valid and
321 # between a node's start and end pfns, it may not
322 # reside on that node. See memmap_init_zone()
324 config NODES_SPAN_OTHER_NODES
326 depends on NEED_MULTIPLE_NODES
328 config PPC_HAS_HASH_64K
336 select PPC_HAS_HASH_64K
338 This option changes the kernel logical page size to 64k. On machines
339 without processor support for 64k pages, the kernel will simulate
340 them by loading each individual 4k page on demand transparently,
341 while on hardware with such support, it will be used to map
342 normal application pages.
345 bool "SMT (Hyperthreading) scheduler support"
346 depends on PPC64 && SMP
348 SMT scheduler support improves the CPU scheduler's decision making
349 when dealing with POWER5 cpus at a cost of slightly increased
350 overhead in some places. If unsure say N here.
352 config PROC_DEVICETREE
353 bool "Support for device tree in /proc"
356 This option adds a device-tree directory under /proc which contains
357 an image of the device tree that the kernel copies from Open
358 Firmware or other boot firmware. If unsure, say Y here.
361 bool "Default bootloader kernel arguments"
364 string "Initial kernel command string"
365 depends on CMDLINE_BOOL
366 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
368 On some platforms, there is currently no way for the boot loader to
369 pass arguments to the kernel. For these platforms, you can supply
370 some command-line options at build time by entering them here. In
371 most cases you will need to specify the root device here.
374 source kernel/power/Kconfig
378 bool "Enable seccomp to safely compute untrusted bytecode"
382 This kernel feature is useful for number crunching applications
383 that may need to compute untrusted bytecode during their
384 execution. By using pipes or other transports made available to
385 the process as file descriptors supporting the read/write
386 syscalls, it's possible to isolate those applications in
387 their own address space using seccomp. Once seccomp is
388 enabled via /proc/<pid>/seccomp, it cannot be disabled
389 and the task is only allowed to execute a few safe syscalls
390 defined by each seccomp mode.
392 If unsure, say Y. Only embedded should say N here.
394 config WANT_DEVICE_TREE
399 string "Static device tree source file"
400 depends on WANT_DEVICE_TREE
402 This specifies the device tree source (.dts) file to be
403 compiled and included when building the bootwrapper. If a
404 relative filename is given, then it will be relative to
405 arch/powerpc/boot/dts. If you are not using the bootwrapper,
406 or do not need to build a dts into the bootwrapper, this
409 For example, this is required when building a cuImage target
410 for an older U-Boot, which cannot pass a device tree itself.
411 Such a kernel will not work with a newer U-Boot that tries to
412 pass a device tree (unless you tell it not to). If your U-Boot
413 does not mention a device tree in "help bootm", then use the
414 cuImage target and specify a device tree here. Otherwise, use
415 the uImage target and leave this field blank.
421 default !PPC_ISERIES || PCI
426 bool "Support for ISA-bus hardware"
427 depends on PPC_PREP || PPC_CHRP
430 Find out whether you have ISA slots on your motherboard. ISA is the
431 name of a bus system, i.e. the way the CPU talks to the other stuff
432 inside your box. If you have an Apple machine, say N here; if you
433 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
434 you have an embedded board, consult your board documentation.
440 config GENERIC_ISA_DMA
442 depends on PPC64 || POWER4 || 6xx && !CPM2
445 config PPC_INDIRECT_PCI
448 default y if 40x || 44x
462 select PPC_INDIRECT_PCI
464 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
469 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
470 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
472 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
473 && !PPC_85xx && !PPC_86xx
474 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
475 default PCI_QSPAN if !4xx && !CPM2 && 8xx
476 select ARCH_SUPPORTS_MSI
478 Find out whether your system includes a PCI bus. PCI is the name of
479 a bus system, i.e. the way the CPU talks to the other stuff inside
480 your box. If you say Y here, the kernel will include drivers and
481 infrastructure code to support PCI bus devices.
491 depends on !4xx && !CPM2 && 8xx
494 Say Y here if you have a system based on a Motorola 8xx-series
495 embedded processor with a QSPAN PCI interface, otherwise say N.
499 depends on PCI && 8260
500 select PPC_INDIRECT_PCI
504 bool "Enable workaround for MPC826x erratum PCI 9"
505 depends on PCI_8260 && !8272
509 prompt "IDMA channel for PCI 9 workaround"
512 config 8260_PCI9_IDMA1
515 config 8260_PCI9_IDMA2
518 config 8260_PCI9_IDMA3
521 config 8260_PCI9_IDMA4
526 source "drivers/pci/pcie/Kconfig"
528 source "drivers/pci/Kconfig"
530 source "drivers/pcmcia/Kconfig"
532 source "drivers/pci/hotplug/Kconfig"
536 menu "Advanced setup"
539 config ADVANCED_OPTIONS
540 bool "Prompt for advanced kernel configuration options"
542 This option will enable prompting for a variety of advanced kernel
543 configuration options. These options can cause the kernel to not
544 work if they are set incorrectly, but can be used to optimize certain
545 aspects of kernel memory management.
547 Unless you know what you are doing, say N here.
549 comment "Default settings for advanced configuration options are used"
550 depends on !ADVANCED_OPTIONS
552 config HIGHMEM_START_BOOL
553 bool "Set high memory pool address"
554 depends on ADVANCED_OPTIONS && HIGHMEM
556 This option allows you to set the base address of the kernel virtual
557 area used to map high memory pages. This can be useful in
558 optimizing the layout of kernel virtual memory.
560 Say N here unless you know what you are doing.
563 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
566 config LOWMEM_SIZE_BOOL
567 bool "Set maximum low memory"
568 depends on ADVANCED_OPTIONS
570 This option allows you to set the maximum amount of memory which
571 will be used as "low memory", that is, memory which the kernel can
572 access directly, without having to set up a kernel virtual mapping.
573 This can be useful in optimizing the layout of kernel virtual
576 Say N here unless you know what you are doing.
579 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
582 config KERNEL_START_BOOL
583 bool "Set custom kernel base address"
584 depends on ADVANCED_OPTIONS
586 This option allows you to set the kernel virtual address at which
587 the kernel will map low memory (the kernel image will be linked at
588 this address). This can be useful in optimizing the virtual memory
589 layout of the system.
591 Say N here unless you know what you are doing.
594 hex "Virtual address of kernel base" if KERNEL_START_BOOL
597 config TASK_SIZE_BOOL
598 bool "Set custom user task size"
599 depends on ADVANCED_OPTIONS
601 This option allows you to set the amount of virtual address space
602 allocated to user tasks. This can be useful in optimizing the
603 virtual memory layout of the system.
605 Say N here unless you know what you are doing.
608 hex "Size of user task space" if TASK_SIZE_BOOL
609 default "0x80000000" if PPC_PREP || PPC_8xx
612 config CONSISTENT_START_BOOL
613 bool "Set custom consistent memory pool address"
614 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
616 This option allows you to set the base virtual address
617 of the consistent memory pool. This pool of virtual
618 memory is used to make consistent memory allocations.
620 config CONSISTENT_START
621 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
622 default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
623 default "0xff100000" if NOT_COHERENT_CACHE
625 config CONSISTENT_SIZE_BOOL
626 bool "Set custom consistent memory pool size"
627 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
629 This option allows you to set the size of the
630 consistent memory pool. This pool of virtual memory
631 is used to make consistent memory allocations.
633 config CONSISTENT_SIZE
634 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
635 default "0x00200000" if NOT_COHERENT_CACHE
637 config BOOT_LOAD_BOOL
638 bool "Set the boot link/load address"
639 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
641 This option allows you to set the initial load address of the zImage
642 or zImage.initrd file. This can be useful if you are on a board
643 which has a small amount of memory.
645 Say N here unless you know what you are doing.
648 hex "Link/load address for booting" if BOOT_LOAD_BOOL
649 default "0x00400000" if 40x || 8xx || 8260
650 default "0x01000000" if 44x
654 bool "Pinned Kernel TLBs (860 ONLY)"
655 depends on ADVANCED_OPTIONS && 8xx
661 default "0xc000000000000000"
666 source "drivers/Kconfig"
670 # XXX source "arch/ppc/8xx_io/Kconfig"
672 # XXX source "arch/ppc/8260_io/Kconfig"
674 source "arch/powerpc/sysdev/qe_lib/Kconfig"
678 source "kernel/Kconfig.instrumentation"
680 source "arch/powerpc/Kconfig.debug"
682 source "security/Kconfig"
686 depends on COMPAT && KEYS
689 source "crypto/Kconfig"