2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
16 config RWSEM_GENERIC_SPINLOCK
19 config RWSEM_XCHGADD_ALGORITHM
23 config GENERIC_CALIBRATE_DELAY
27 config GENERIC_ISA_DMA
43 config SCHED_NO_NO_OMIT_FRAME_POINTER
47 # We optimistically allocate largepages from the VM, so make the limit
48 # large enough (16MB). This badly named config option is actually
50 config FORCE_MAX_ZONEORDER
58 depends on COMPAT && SYSVIPC
61 menu "Platform support"
64 prompt "Platform Type"
65 default PPC_MULTIPLATFORM
68 bool "IBM Legacy iSeries"
70 config PPC_MULTIPLATFORM
76 depends on PPC_MULTIPLATFORM
77 bool " IBM pSeries & new iSeries"
81 depends on PPC_MULTIPLATFORM
82 bool " Apple G5 based machines"
87 depends on PPC_MULTIPLATFORM
88 bool " Maple 970FX Evaluation Board"
93 This option enables support for the Maple 970FX Evaluation Board.
94 For more informations, refer to <http://www.970eval.com>
105 depends on PPC_MULTIPLATFORM
109 # VMX is pSeries only for now until somebody writes the iSeries
110 # exception vectors for it
112 bool "Support for VMX (Altivec) vector unit"
113 depends on PPC_MULTIPLATFORM
117 depends on PPC_PSERIES
118 bool "Support for shared-processor logical partitions"
121 Enabling this option will make the kernel run more efficiently
122 on logically-partitioned pSeries systems which use shared
123 processors, that is, which share physical processors between
124 two or more partitions.
127 depends on PPC_PSERIES || PPC_ISERIES
133 depends on PPC_MULTIPLATFORM
136 config MPIC_BROKEN_U3
147 bool "Support for early boot text console"
150 Say Y here to see progress messages from the boot firmware in text
151 mode. Requires an Open Firmware compatible video card.
154 bool "Optimize for POWER4"
157 Cause the compiler to optimize for POWER4 processors. The resulting
158 binary will not work on POWER3 or RS64 processors when compiled with
159 binutils 2.15 or later.
162 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
163 depends on EXPERIMENTAL
166 Cause IO segments sent to a device for DMA to be merged virtually
167 by the IOMMU when they happen to have been allocated contiguously.
168 This doesn't add pressure to the IOMMU allocator. However, some
169 drivers don't support getting large merged segments coming back
170 from *_map_sg(). Say Y if you know the drivers you are using are
171 properly handling this case.
174 bool "Symmetric multi-processing support"
176 This enables support for systems with more than one CPU. If you have
177 a system with only one CPU, say N. If you have a system with more
180 If you say N here, the kernel will run on single and multiprocessor
181 machines, but will use only one CPU of a multiprocessor machine. If
182 you say Y here, the kernel will run on single-processor machines.
183 On a single-processor machine, the kernel will run faster if you say
186 If you don't know what to do here, say Y.
189 int "Maximum number of CPUs (2-128)"
195 bool "Hardware multithreading"
196 depends on SMP && PPC_PSERIES && BROKEN
198 This option enables hardware multithreading on RS64 cpus.
199 pSeries systems p620 and p660 have such a cpu type.
201 config ARCH_DISCONTIGMEM_ENABLE
202 bool "Discontiguous Memory Support"
203 depends on SMP && PPC_PSERIES
209 depends on DISCONTIGMEM
212 bool "SMT (Hyperthreading) scheduler support"
216 SMT scheduler support improves the CPU scheduler's decision making
217 when dealing with POWER5 cpus at a cost of slightly increased
218 overhead in some places. If unsure say N here.
221 bool "Preemptible Kernel"
223 This option reduces the latency of the kernel when reacting to
224 real-time or interactive events by allowing a low priority process to
225 be preempted even if it is in kernel mode executing a system call.
227 Say Y here if you are building a kernel for a desktop, embedded
228 or real-time system. Say N if you are unsure.
231 bool "Preempt The Big Kernel Lock"
235 This option reduces the latency of the kernel by making the
236 big kernel lock preemptible.
238 Say Y here if you are building a kernel for a desktop system.
239 Say N if you are unsure.
242 bool "PCI Extended Error Handling (EEH)" if EMBEDDED
243 depends on PPC_PSERIES
244 default y if !EMBEDDED
247 # Use the generic interrupt handling code in kernel/irq/:
249 config GENERIC_HARDIRQS
255 depends on PPC_ISERIES
261 depends on PPC_PSERIES
265 bool "Proc interface to RTAS"
270 tristate "Firmware flash interface"
274 tristate "Scanlog dump interface"
275 depends on RTAS_PROC && PPC_PSERIES
278 tristate "LPAR Configuration Data"
279 depends on PPC_PSERIES || PPC_ISERIES
281 Provide system capacity information via human readable
282 <key word>=<value> pairs through a /proc/ppc64/lparcfg interface.
285 bool "Enable seccomp to safely compute untrusted bytecode"
289 This kernel feature is useful for number crunching applications
290 that may need to compute untrusted bytecode during their
291 execution. By using pipes or other transports made available to
292 the process as file descriptors supporting the read/write
293 syscalls, it's possible to isolate those applications in
294 their own address space using seccomp. Once seccomp is
295 enabled via /proc/<pid>/seccomp, it cannot be disabled
296 and the task is only allowed to execute a few safe syscalls
297 defined by each seccomp mode.
299 If unsure, say Y. Only embedded should say N here.
312 Find out whether you have ISA slots on your motherboard. ISA is the
313 name of a bus system, i.e. the way the CPU talks to the other stuff
314 inside your box. If you have an Apple machine, say N here; if you
315 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
316 you have an embedded board, consult your board documentation.
328 bool "support for PCI devices" if (EMBEDDED && PPC_ISERIES)
331 Find out whether your system includes a PCI bus. PCI is the name of
332 a bus system, i.e. the way the CPU talks to the other stuff inside
333 your box. If you say Y here, the kernel will include drivers and
334 infrastructure code to support PCI bus devices.
340 source "fs/Kconfig.binfmt"
342 source "drivers/pci/Kconfig"
345 bool "Support for hot-pluggable CPUs"
346 depends on SMP && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
349 Say Y here to be able to turn CPUs off and on.
351 Say N if you are unsure.
353 source "drivers/pcmcia/Kconfig"
355 source "drivers/pci/hotplug/Kconfig"
357 config PROC_DEVICETREE
358 bool "Support for Open Firmware device tree in /proc"
359 depends on !PPC_ISERIES
361 This option adds a device-tree directory under /proc which contains
362 an image of the device tree that the kernel copies from Open
363 Firmware. If unsure, say Y here.
366 bool "Default bootloader kernel arguments"
367 depends on !PPC_ISERIES
370 string "Initial kernel command string"
371 depends on CMDLINE_BOOL
372 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
374 On some platforms, there is currently no way for the boot loader to
375 pass arguments to the kernel. For these platforms, you can supply
376 some command-line options at build time by entering them here. In
377 most cases you will need to specify the root device here.
381 source "drivers/Kconfig"
385 menu "iSeries device drivers"
386 depends on PPC_ISERIES
389 tristate "iSeries Virtual Console Support"
392 tristate "iSeries Virtual I/O disk support"
394 If you are running on an iSeries system and you want to use
395 virtual disks created and managed by OS/400, say Y.
398 tristate "iSeries Virtual I/O CD support"
400 If you are running Linux on an IBM iSeries system and you want to
401 read a CD drive owned by OS/400, say Y here.
404 tristate "iSeries Virtual Tape Support"
406 If you are running Linux on an iSeries system and you want Linux
407 to read and/or write a tape drive owned by OS/400, say Y here.
413 depends on VIOCONS || VIODASD || VIOCD || VIOTAPE || VETH
416 source "arch/ppc64/oprofile/Kconfig"
418 source "arch/ppc64/Kconfig.debug"
420 source "security/Kconfig"
424 depends on COMPAT && KEYS
427 source "crypto/Kconfig"