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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/kconfig-language.txt.
3#
4
5mainmenu "Linux/PowerPC Kernel Configuration"
6
Arnd Bergmanna0ae9c72007-06-13 02:30:17 +10007source "arch/powerpc/platforms/Kconfig.cputype"
Johannes Berg17e638b2007-03-19 11:53:53 +01008
Paul Mackerras14cf11a2005-09-26 16:04:21 +10009config PPC32
10 bool
11 default y if !PPC64
12
13config 64BIT
14 bool
15 default y if PPC64
16
Stephen Rothwell2578bfa2007-09-21 10:16:20 +100017config WORD_SIZE
18 int
19 default 64 if PPC64
20 default 32 if !PPC64
21
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -070022config ARCH_PHYS_ADDR_T_64BIT
23 def_bool PPC64 || PHYS_64BIT
24
Paul Mackerras14cf11a2005-09-26 16:04:21 +100025config MMU
26 bool
27 default y
28
Tony Breedsaa3be5f2007-09-21 13:26:02 +100029config GENERIC_CMOS_UPDATE
30 def_bool y
31
Tony Breeds4a4cfe32007-09-22 07:35:52 +100032config GENERIC_TIME
33 def_bool y
34
35config GENERIC_TIME_VSYSCALL
36 def_bool y
37
Tony Breedsd831d0b2007-09-21 13:26:03 +100038config GENERIC_CLOCKEVENTS
39 def_bool y
40
Paul Mackerras14cf11a2005-09-26 16:04:21 +100041config GENERIC_HARDIRQS
42 bool
43 default y
44
travis@sgi.com988c3882008-01-30 23:27:58 +010045config HAVE_SETUP_PER_CPU_AREA
travis@sgi.comb32ef632008-01-30 13:32:51 +010046 def_bool PPC64
47
Ingo Molnar0d7012a2006-06-29 02:24:43 -070048config IRQ_PER_CPU
49 bool
50 default y
51
Christoph Hellwigfd3e0bb2008-04-17 14:35:00 +100052config STACKTRACE_SUPPORT
53 bool
54 default y
55
Arnd Bergmann01f4b8b2008-07-11 00:08:18 +100056config HAVE_LATENCYTOP_SUPPORT
57 def_bool y
58
Benjamin Herrenschmidt945feb12008-04-17 14:35:01 +100059config TRACE_IRQFLAGS_SUPPORT
60 bool
61 depends on PPC64
62 default y
63
64config LOCKDEP_SUPPORT
65 bool
66 default y
67
Paul Mackerras14cf11a2005-09-26 16:04:21 +100068config RWSEM_GENERIC_SPINLOCK
69 bool
70
71config RWSEM_XCHGADD_ALGORITHM
72 bool
73 default y
74
Nick Piggin95c354f2008-01-30 13:31:20 +010075config GENERIC_LOCKBREAK
76 bool
77 default y
78 depends on SMP && PREEMPT
79
David Howellsf0d1b0b2006-12-08 02:37:49 -080080config ARCH_HAS_ILOG2_U32
81 bool
David Howellsef55d532006-12-08 02:37:53 -080082 default y
David Howellsf0d1b0b2006-12-08 02:37:49 -080083
84config ARCH_HAS_ILOG2_U64
85 bool
David Howellsef55d532006-12-08 02:37:53 -080086 default y if 64BIT
David Howellsf0d1b0b2006-12-08 02:37:49 -080087
Akinobu Mitae779b2f2006-03-26 01:39:33 -080088config GENERIC_HWEIGHT
89 bool
90 default y
91
Paul Mackerras14cf11a2005-09-26 16:04:21 +100092config GENERIC_CALIBRATE_DELAY
93 bool
94 default y
95
Jon Mason0a9cb462006-05-19 15:35:32 -050096config GENERIC_FIND_NEXT_BIT
97 bool
98 default y
99
Anton Vorontsovb7ce3412008-04-11 23:06:36 +1000100config GENERIC_GPIO
101 bool
102 help
103 Generic GPIO API support
104
Stephen Rothwellf057eac2007-07-15 23:40:05 -0700105config ARCH_NO_VIRT_TO_BUS
106 def_bool PPC64
107
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000108config PPC
109 bool
110 default y
Steven Rostedt2b79d692009-01-06 18:49:17 +0000111 select HAVE_FTRACE_MCOUNT_RECORD
112 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -0400113 select HAVE_FUNCTION_TRACER
Steven Rostedt60ce8f72009-02-11 20:06:43 -0500114 select HAVE_FUNCTION_GRAPH_TRACER
Michael Buesch7444a722008-07-25 01:46:11 -0700115 select ARCH_WANT_OPTIONAL_GPIOLIB
Sam Ravnborgec7748b2008-02-09 10:46:40 +0100116 select HAVE_IDE
Benjamin Herrenschmidta1f242f2008-07-23 21:27:08 -0700117 select HAVE_IOREMAP_PROT
Johannes Berg58340a02008-07-25 01:45:33 -0700118 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Mathieu Desnoyers3f550092008-02-02 15:10:35 -0500119 select HAVE_KPROBES
Jason Wessel17ce4522008-07-23 11:30:15 -0500120 select HAVE_ARCH_KGDB
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -0800121 select HAVE_KRETPROBES
Roland McGrathdec2b0d2008-07-27 16:53:20 +1000122 select HAVE_ARCH_TRACEHOOK
David S. Millerd9b2b2a2008-02-13 16:56:49 -0800123 select HAVE_LMB
Takashi Iwai7ff86b02008-07-16 02:20:11 +0200124 select HAVE_DMA_ATTRS if PPC64
Jens Axboeb7d7a242008-06-26 11:22:13 +0200125 select USE_GENERIC_SMP_HELPERS if SMP
Steven Rostedt4e491d12008-05-14 23:49:44 -0400126 select HAVE_OPROFILE
Benjamin Herrenschmidtee6a0932009-01-14 14:14:00 +0100127 select HAVE_SYSCALL_WRAPPERS if PPC64
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000128
129config EARLY_PRINTK
130 bool
Benjamin Herrenschmidt51d30822005-11-23 17:57:25 +1100131 default y
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000132
133config COMPAT
134 bool
135 default y if PPC64
Roland McGrath01e31db2008-01-02 17:03:11 -0800136 select COMPAT_BINFMT_ELF
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000137
138config SYSVIPC_COMPAT
139 bool
140 depends on COMPAT && SYSVIPC
141 default y
142
143# All PPC32s use generic nvram driver through ppc_md
144config GENERIC_NVRAM
145 bool
146 default y if PPC32
147
Ingo Molnarae1e9132008-11-11 09:05:16 +0100148config SCHED_OMIT_FRAME_POINTER
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000149 bool
150 default y
151
152config ARCH_MAY_HAVE_PC_FDC
153 bool
Stephen Rothwellbed59272007-03-04 17:04:44 +1100154 default !PPC_PSERIES || PCI
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000155
Kumar Gala08264cb2006-01-10 21:43:56 -0600156config PPC_OF
157 def_bool y
158
Stephen Rothwell97e873e2007-05-01 16:26:07 +1000159config OF
160 def_bool y
161
Kumar Gala08264cb2006-01-10 21:43:56 -0600162config PPC_UDBG_16550
163 bool
164 default n
165
Kumar Gala08264cb2006-01-10 21:43:56 -0600166config GENERIC_TBSYNC
167 bool
168 default y if PPC32 && SMP
169 default n
170
Al Viroe65e1fc2006-09-12 03:04:40 -0400171config AUDIT_ARCH
172 bool
173 default y
174
Jeremy Fitzhardinge73c9cea2006-12-08 03:30:41 -0800175config GENERIC_BUG
176 bool
177 default y
178 depends on BUG
179
Johannes Bergb3028872007-03-20 05:18:02 +1100180config SYS_SUPPORTS_APM_EMULATION
Kumar Gala58da10b2007-05-23 09:51:46 -0500181 default y if PMAC_APM_EMU
Johannes Bergb3028872007-03-20 05:18:02 +1100182 bool
183
Kumar Galaf4fc4a52006-01-16 10:53:22 -0600184config DEFAULT_UIMAGE
185 bool
186 help
187 Used to allow a board to specify it wants a uImage built by default
188 default n
189
Scott Woodb09c1642008-01-17 16:31:40 -0600190config REDBOOT
191 bool
192
Johannes Berg801e4062007-12-08 02:12:39 +0100193config HIBERNATE_32
Johannes Berg543b9fd2007-05-03 22:31:38 +1000194 bool
Johannes Berg801e4062007-12-08 02:12:39 +0100195 depends on (PPC_PMAC && !SMP) || BROKEN
196 default y
197
198config HIBERNATE_64
199 bool
200 depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
201 default y
202
203config ARCH_HIBERNATION_POSSIBLE
204 bool
205 depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
Johannes Berg543b9fd2007-05-03 22:31:38 +1000206 default y
207
Johannes Bergf4cb5702007-12-08 02:14:00 +0100208config ARCH_SUSPEND_POSSIBLE
209 def_bool y
Scott Woodd49747b2007-10-09 12:37:13 -0500210 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
Johannes Bergf4cb5702007-12-08 02:14:00 +0100211
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +1100212config PPC_DCR_NATIVE
213 bool
214 default n
215
216config PPC_DCR_MMIO
217 bool
218 default n
219
220config PPC_DCR
221 bool
222 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
223 default y
224
Benjamin Herrenschmidt4c9d2802006-11-11 17:25:08 +1100225config PPC_OF_PLATFORM_PCI
226 bool
Stephen Rothwell373a6da2007-12-21 15:37:07 +1100227 depends on PCI
Benjamin Herrenschmidt4c9d2802006-11-11 17:25:08 +1100228 depends on PPC64 # not supported on 32 bits yet
229 default n
230
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000231source "init/Kconfig"
232
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700233source "kernel/Kconfig.freezer"
234
Benjamin Herrenschmidta2d2e1e2007-12-21 15:39:24 +1100235source "arch/powerpc/sysdev/Kconfig"
Kumar Gala4330f5d2007-03-16 09:32:17 -0500236source "arch/powerpc/platforms/Kconfig"
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000237
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000238menu "Kernel options"
239
240config HIGHMEM
241 bool "High memory support"
242 depends on PPC32
243
Tony Breeds1ad74992007-09-21 13:26:03 +1000244source kernel/time/Kconfig
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000245source kernel/Kconfig.hz
246source kernel/Kconfig.preempt
247source "fs/Kconfig.binfmt"
248
Mel Gormanba72cb82007-11-28 16:21:13 -0800249config HUGETLB_PAGE_SIZE_VARIABLE
250 bool
251 depends on HUGETLB_PAGE
252 default y
253
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000254config MATH_EMULATION
255 bool "Math emulation"
Kumar Gala4d527192007-01-26 00:23:34 -0600256 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000257 ---help---
258 Some PowerPC chips designed for embedded applications do not have
259 a floating-point unit and therefore do not implement the
260 floating-point instructions in the PowerPC instruction set. If you
261 say Y here, the kernel will include code to emulate a floating-point
262 unit, which will allow programs that use floating-point
263 instructions to run.
264
Scott Wood5dd57a12007-09-18 15:29:35 -0500265config 8XX_MINIMAL_FPEMU
266 bool "Minimal math emulation for 8xx"
267 depends on 8xx && !MATH_EMULATION
268 help
269 Older arch/ppc kernels still emulated a few floating point
270 instructions such as load and store, even when full math
271 emulation is disabled. Say "Y" here if you want to preserve
272 this behavior.
273
274 It is recommended that you build a soft-float userspace instead.
275
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000276config IOMMU_VMERGE
Linas Vepstas768cc2d2007-07-18 02:09:35 +1000277 bool "Enable IOMMU virtual merging"
278 depends on PPC64
279 default y
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000280 help
281 Cause IO segments sent to a device for DMA to be merged virtually
282 by the IOMMU when they happen to have been allocated contiguously.
283 This doesn't add pressure to the IOMMU allocator. However, some
284 drivers don't support getting large merged segments coming back
Linas Vepstas768cc2d2007-07-18 02:09:35 +1000285 from *_map_sg().
286
287 Most drivers don't have this problem; it is safe to say Y here.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000288
FUJITA Tomonorifb3475e2008-02-04 22:28:08 -0800289config IOMMU_HELPER
290 def_bool PPC64
291
Becky Bruce15e09c02008-11-20 06:49:16 +0000292config PPC_NEED_DMA_SYNC_OPS
293 def_bool y
294 depends on NOT_COHERENT_CACHE
295
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000296config HOTPLUG_CPU
297 bool "Support for enabling/disabling CPUs"
298 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
299 ---help---
300 Say Y here to be able to disable and re-enable individual
301 CPUs at runtime on SMP machines.
302
303 Say N if you are unsure.
304
Yasunori Gotocc576372006-06-29 02:24:27 -0700305config ARCH_ENABLE_MEMORY_HOTPLUG
306 def_bool y
307
Badari Pulavartya99824f2008-02-05 00:10:18 -0800308config ARCH_HAS_WALK_MEMORY
309 def_bool y
310
Badari Pulavarty14824712008-02-05 00:10:17 -0800311config ARCH_ENABLE_MEMORY_HOTREMOVE
312 def_bool y
313
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000314config KEXEC
315 bool "kexec system call (EXPERIMENTAL)"
Benjamin Herrenschmidt28794d32009-03-10 17:53:27 +0000316 depends on BOOK3S && EXPERIMENTAL
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000317 help
318 kexec is a system call that implements the ability to shutdown your
319 current kernel, and to start another kernel. It is like a reboot
Matt LaPlante1f1332f2006-06-29 01:32:47 -0400320 but it is independent of the system firmware. And like a reboot
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000321 you can start any kernel with it, not just Linux.
322
Matt LaPlante1f1332f2006-06-29 01:32:47 -0400323 The name comes from the similarity to the exec system call.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000324
325 It is an ongoing process to be certain the hardware in a machine
326 is properly shutdown, so do not be surprised if this code does not
327 initially work for you. It may help to enable device hotplugging
328 support. As of this writing the exact hardware interface is
329 strongly in flux, so no good recommendation can be made.
330
Haren Mynenie8625d462006-01-14 13:48:25 -0800331config CRASH_DUMP
Bernhard Walle3420b5d2008-06-27 03:02:15 +1000332 bool "Build a kdump crash kernel"
Mohan Kumar Mc6ac71a2009-01-06 00:23:01 +0000333 depends on PPC64 || 6xx
334 select RELOCATABLE if PPC64
Haren Mynenie8625d462006-01-14 13:48:25 -0800335 help
336 Build a kernel suitable for use as a kdump capture kernel.
Mohan Kumar M54622f12008-10-21 17:38:10 +0000337 The same kernel binary can be used as production kernel and dump
338 capture kernel.
Haren Mynenie8625d462006-01-14 13:48:25 -0800339
Manish Ahuja242f2712008-03-22 10:50:50 +1100340config PHYP_DUMP
341 bool "Hypervisor-assisted dump (EXPERIMENTAL)"
342 depends on PPC_PSERIES && EXPERIMENTAL
343 help
344 Hypervisor-assisted dump is meant to be a kdump replacement
345 offering robustness and speed not possible without system
346 hypervisor assistence.
347
348 If unsure, say "N"
349
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000350config PPCBUG_NVRAM
351 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
352 default y if PPC_PREP
353
354config IRQ_ALL_CPUS
355 bool "Distribute interrupts on all CPUs by default"
356 depends on SMP && !MV64360
357 help
358 This option gives the kernel permission to distribute IRQs across
359 multiple CPUs. Saying N here will route all IRQs to the first
360 CPU. Generally saying Y is safe, although some problems have been
361 reported with SMP Power Macintoshes with this option enabled.
362
Andy Whitcroftffa27b62005-10-28 17:46:58 -0700363config NUMA
364 bool "NUMA support"
365 depends on PPC64
366 default y if SMP && PPC_PSERIES
367
Yasunori Gotoc80d79d2006-04-10 22:53:53 -0700368config NODES_SHIFT
369 int
370 default "4"
371 depends on NEED_MULTIPLE_NODES
372
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000373config ARCH_SELECT_MEMORY_MODEL
374 def_bool y
375 depends on PPC64
376
377config ARCH_FLATMEM_ENABLE
Andy Whitcroft9100b202005-11-29 19:20:55 +0000378 def_bool y
379 depends on (PPC64 && !NUMA) || PPC32
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000380
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000381config ARCH_SPARSEMEM_ENABLE
382 def_bool y
Andy Whitcroft9100b202005-11-29 19:20:55 +0000383 depends on PPC64
Andy Whitcroftd29eff72007-10-16 01:24:17 -0700384 select SPARSEMEM_VMEMMAP_ENABLE
Anton Blanchard45fb6ce2005-11-11 14:22:35 +1100385
386config ARCH_SPARSEMEM_DEFAULT
387 def_bool y
Benjamin Herrenschmidt78bde532007-02-13 11:46:06 +1100388 depends on (SMP && PPC_PSERIES) || PPC_PS3
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000389
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700390config ARCH_POPULATES_NODE_MAP
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000391 def_bool y
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700392
393source "mm/Kconfig"
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000394
Mike Kravetz7e9191d2005-11-07 09:39:48 -0800395config ARCH_MEMORY_PROBE
396 def_bool y
397 depends on MEMORY_HOTPLUG
398
Andy Whitcroft75167952006-10-21 10:24:14 -0700399# Some NUMA nodes have memory ranges that span
400# other nodes. Even though a pfn is valid and
401# between a node's start and end pfns, it may not
402# reside on that node. See memmap_init_zone()
403# for details.
404config NODES_SPAN_OTHER_NODES
405 def_bool y
406 depends on NEED_MULTIPLE_NODES
407
Benjamin Herrenschmidt16c2d472007-05-08 16:27:28 +1000408config PPC_HAS_HASH_64K
409 bool
410 depends on PPC64
411 default n
412
Yuri Tikhonove1240122009-01-29 01:40:44 +0000413config STDBINUTILS
414 bool "Using standard binutils settings"
415 depends on 44x
416 default y
417 help
418 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
419 Note, that kernel will be able to run only those applications,
420 which had been compiled using binutils later than 2.17.50.0.3 with
421 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
422 the older binutils, you can patch them with a trivial patch, which
423 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
424
Ilya Yanokca9153a2008-12-11 04:55:41 +0300425choice
426 prompt "Page size"
427 default PPC_4K_PAGES
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100428 help
Ilya Yanokca9153a2008-12-11 04:55:41 +0300429 Select the kernel logical page size. Increasing the page size
430 will reduce software overhead at each page boundary, allow
431 hardware prefetch mechanisms to be more effective, and allow
432 larger dma transfers increasing IO efficiency and reducing
433 overhead. However the utilization of memory will increase.
434 For example, each cached file will using a multiple of the
435 page size to hold its contents and the difference between the
436 end of file and the end of page is wasted.
437
438 Some dedicated systems, such as software raid serving with
439 accelerated calculations, have shown significant increases.
440
441 If you configure a 64 bit kernel for 64k pages but the
442 processor does not support them, then the kernel will simulate
443 them with 4k pages, loading them on demand, but with the
444 reduced software overhead and larger internal fragmentation.
445 For the 32 bit kernel, a large page option will not be offered
446 unless it is supported by the configured processor.
447
448 If unsure, choose 4K_PAGES.
449
450config PPC_4K_PAGES
451 bool "4k page size"
452
453config PPC_16K_PAGES
454 bool "16k page size" if 44x
455
456config PPC_64K_PAGES
457 bool "64k page size" if 44x || PPC_STD_MMU_64
458 select PPC_HAS_HASH_64K if PPC_STD_MMU_64
459
Yuri Tikhonove1240122009-01-29 01:40:44 +0000460config PPC_256K_PAGES
461 bool "256k page size" if 44x
462 depends on !STDBINUTILS && (!SHMEM || BROKEN)
463 help
464 Make the page size 256k.
465
466 As the ELF standard only requires alignment to support page
467 sizes up to 64k, you will need to compile all of your user
468 space applications with a non-standard binutils settings
469 (see the STDBINUTILS description for details).
470
471 Say N unless you know what you are doing.
472
Ilya Yanokca9153a2008-12-11 04:55:41 +0300473endchoice
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100474
Stephen Rothwell53bcddb2008-04-11 11:11:56 +1000475config FORCE_MAX_ZONEORDER
476 int "Maximum zone order"
Ilya Yanokca9153a2008-12-11 04:55:41 +0300477 range 9 64 if PPC_STD_MMU_64 && PPC_64K_PAGES
478 default "9" if PPC_STD_MMU_64 && PPC_64K_PAGES
479 range 13 64 if PPC_STD_MMU_64 && !PPC_64K_PAGES
480 default "13" if PPC_STD_MMU_64 && !PPC_64K_PAGES
481 range 9 64 if PPC_STD_MMU_32 && PPC_16K_PAGES
482 default "9" if PPC_STD_MMU_32 && PPC_16K_PAGES
483 range 7 64 if PPC_STD_MMU_32 && PPC_64K_PAGES
484 default "7" if PPC_STD_MMU_32 && PPC_64K_PAGES
Yuri Tikhonove1240122009-01-29 01:40:44 +0000485 range 5 64 if PPC_STD_MMU_32 && PPC_256K_PAGES
486 default "5" if PPC_STD_MMU_32 && PPC_256K_PAGES
Johannes Bergebe40c52008-09-24 04:29:08 +0000487 range 11 64
Stephen Rothwell53bcddb2008-04-11 11:11:56 +1000488 default "11"
489 help
490 The kernel memory allocator divides physically contiguous memory
491 blocks into "zones", where each zone is a power of two number of
492 pages. This option selects the largest power of two that the kernel
493 keeps in the memory allocator. If you need to allocate very large
494 blocks of physically contiguous memory, then you may need to
495 increase this value.
496
497 This config option is actually maximum order plus one. For example,
498 a value of 11 means that the largest free memory block is 2^10 pages.
499
500 The page size is not necessarily 4KB. For example, on 64-bit
501 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
502 this in mind when choosing a value for this option.
503
Paul Mackerrasfa282372008-01-24 08:35:13 +1100504config PPC_SUBPAGE_PROT
505 bool "Support setting protections for 4k subpages"
Ilya Yanokca9153a2008-12-11 04:55:41 +0300506 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
Paul Mackerrasfa282372008-01-24 08:35:13 +1100507 help
508 This option adds support for a system call to allow user programs
509 to set access permissions (read/write, readonly, or no access)
510 on the 4k subpages of each 64k page.
511
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000512config SCHED_SMT
513 bool "SMT (Hyperthreading) scheduler support"
514 depends on PPC64 && SMP
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000515 help
516 SMT scheduler support improves the CPU scheduler's decision making
517 when dealing with POWER5 cpus at a cost of slightly increased
518 overhead in some places. If unsure say N here.
519
520config PROC_DEVICETREE
Paul Mackerras5f296752005-10-17 20:14:59 +1000521 bool "Support for device tree in /proc"
522 depends on PROC_FS
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000523 help
524 This option adds a device-tree directory under /proc which contains
525 an image of the device tree that the kernel copies from Open
Paul Mackerras5f296752005-10-17 20:14:59 +1000526 Firmware or other boot firmware. If unsure, say Y here.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000527
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000528config CMDLINE_BOOL
529 bool "Default bootloader kernel arguments"
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000530
531config CMDLINE
532 string "Initial kernel command string"
533 depends on CMDLINE_BOOL
534 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
535 help
536 On some platforms, there is currently no way for the boot loader to
537 pass arguments to the kernel. For these platforms, you can supply
538 some command-line options at build time by entering them here. In
539 most cases you will need to specify the root device here.
540
Grant Likelyc356aa42008-07-09 09:41:52 -0600541config EXTRA_TARGETS
542 string "Additional default image types"
543 help
544 List additional targets to be built by the bootwrapper here (separated
545 by spaces). This is useful for targets that depend of device tree
546 files in the .dts directory.
547
548 Targets in this list will be build as part of the default build
549 target, or when the user does a 'make zImage' or a
550 'make zImage.initrd'.
551
552 If unsure, leave blank
553
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000554if !44x || BROKEN
Johannes Bergb28f5082008-01-15 23:17:00 -0500555config ARCH_WANTS_FREEZER_CONTROL
556 def_bool y
557 depends on ADB_PMU
558
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000559source kernel/power/Kconfig
560endif
561
562config SECCOMP
563 bool "Enable seccomp to safely compute untrusted bytecode"
564 depends on PROC_FS
565 default y
566 help
567 This kernel feature is useful for number crunching applications
568 that may need to compute untrusted bytecode during their
569 execution. By using pipes or other transports made available to
570 the process as file descriptors supporting the read/write
571 syscalls, it's possible to isolate those applications in
572 their own address space using seccomp. Once seccomp is
573 enabled via /proc/<pid>/seccomp, it cannot be disabled
574 and the task is only allowed to execute a few safe syscalls
575 defined by each seccomp mode.
576
577 If unsure, say Y. Only embedded should say N here.
578
579endmenu
580
581config ISA_DMA_API
582 bool
Stephen Rothwell373a6da2007-12-21 15:37:07 +1100583 default !PPC_ISERIES || PCI
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000584
585menu "Bus options"
586
587config ISA
588 bool "Support for ISA-bus hardware"
589 depends on PPC_PREP || PPC_CHRP
Paul Mackerrasf9bd1702005-10-26 16:47:42 +1000590 select PPC_I8259
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000591 help
592 Find out whether you have ISA slots on your motherboard. ISA is the
593 name of a bus system, i.e. the way the CPU talks to the other stuff
594 inside your box. If you have an Apple machine, say N here; if you
595 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
596 you have an embedded board, consult your board documentation.
597
Christoph Lameter5ac6da62007-02-10 01:43:14 -0800598config ZONE_DMA
599 bool
600 default y
601
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000602config GENERIC_ISA_DMA
603 bool
604 depends on PPC64 || POWER4 || 6xx && !CPM2
605 default y
606
Paul Mackerras25635c72005-10-26 16:36:55 +1000607config PPC_INDIRECT_PCI
608 bool
609 depends on PCI
Becky Bruce63dafe52006-01-14 16:57:39 -0600610 default y if 40x || 44x
Paul Mackerras25635c72005-10-26 16:36:55 +1000611 default n
612
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000613config EISA
614 bool
615
616config SBUS
617 bool
618
Kumar Gala08264cb2006-01-10 21:43:56 -0600619config FSL_SOC
620 bool
621
Roy Zang55c44992007-07-10 18:44:34 +0800622config FSL_PCI
623 bool
624 select PPC_INDIRECT_PCI
Kumar Galad0839112009-01-28 13:25:29 -0600625 select PCI_QUIRKS
Roy Zang55c44992007-07-10 18:44:34 +0800626
Stefan Roese2a706912008-03-26 22:39:50 +1100627config 4xx_SOC
628 bool
629
Anton Vorontsovacaa7aa2008-04-11 21:03:40 +0400630config FSL_LBC
631 bool
632 help
633 Freescale Localbus support
634
Anton Vorontsov83ff9dc2008-05-23 20:38:54 +0400635config FSL_GTM
636 bool
637 depends on PPC_83xx || QUICC_ENGINE || CPM2
638 help
639 Freescale General-purpose Timers support
640
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000641# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
642config MCA
643 bool
644
John Rigbyb5005632008-06-26 11:07:56 -0600645# Platforms that what PCI turned unconditionally just do select PCI
646# in their config node. Platforms that want to choose at config
647# time should select PPC_PCI_CHOICE
648config PPC_PCI_CHOICE
649 bool
650
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000651config PCI
John Rigbyb5005632008-06-26 11:07:56 -0600652 bool "PCI support" if PPC_PCI_CHOICE
653 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
Jon Loeliger53158622006-08-09 10:37:28 -0500654 && !PPC_85xx && !PPC_86xx
David Gibsonf21f49e2007-06-13 14:52:54 +1000655 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000656 default PCI_QSPAN if !4xx && !CPM2 && 8xx
Michael Ellermandf87ef52007-05-08 12:58:34 +1000657 select ARCH_SUPPORTS_MSI
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000658 help
659 Find out whether your system includes a PCI bus. PCI is the name of
660 a bus system, i.e. the way the CPU talks to the other stuff inside
661 your box. If you say Y here, the kernel will include drivers and
662 infrastructure code to support PCI bus devices.
663
664config PCI_DOMAINS
Matthew Wilcox36e23592007-07-10 10:54:40 -0600665 def_bool PCI
666
667config PCI_SYSCALL
668 def_bool PCI
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000669
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000670config PCI_QSPAN
671 bool "QSpan PCI"
672 depends on !4xx && !CPM2 && 8xx
Paul Mackerrasf9bd1702005-10-26 16:47:42 +1000673 select PPC_I8259
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000674 help
675 Say Y here if you have a system based on a Motorola 8xx-series
676 embedded processor with a QSPAN PCI interface, otherwise say N.
677
678config PCI_8260
679 bool
680 depends on PCI && 8260
Paul Mackerras25635c72005-10-26 16:36:55 +1000681 select PPC_INDIRECT_PCI
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000682 default y
683
684config 8260_PCI9
Andrew Morton4a3ecc62006-06-01 20:36:04 -0700685 bool "Enable workaround for MPC826x erratum PCI 9"
Scott Woode00c5492007-09-14 15:41:56 -0500686 depends on PCI_8260 && !8272
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000687 default y
688
689choice
Andrew Morton4a3ecc62006-06-01 20:36:04 -0700690 prompt "IDMA channel for PCI 9 workaround"
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000691 depends on 8260_PCI9
692
693config 8260_PCI9_IDMA1
694 bool "IDMA1"
695
696config 8260_PCI9_IDMA2
697 bool "IDMA2"
698
699config 8260_PCI9_IDMA3
700 bool "IDMA3"
701
702config 8260_PCI9_IDMA4
703 bool "IDMA4"
704
705endchoice
706
Jake Moilanenbb53bb32006-06-07 16:05:46 -0500707source "drivers/pci/pcie/Kconfig"
708
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000709source "drivers/pci/Kconfig"
710
711source "drivers/pcmcia/Kconfig"
712
713source "drivers/pci/hotplug/Kconfig"
714
Zhang Weif1f389d2008-04-18 13:33:39 -0700715config HAS_RAPIDIO
716 bool
717 default n
718
719config RAPIDIO
720 bool "RapidIO support"
721 depends on HAS_RAPIDIO
722 help
723 If you say Y here, the kernel will include drivers and
724 infrastructure code to support RapidIO interconnect devices.
725
726source "drivers/rapidio/Kconfig"
727
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000728endmenu
729
730menu "Advanced setup"
731 depends on PPC32
732
733config ADVANCED_OPTIONS
734 bool "Prompt for advanced kernel configuration options"
735 help
736 This option will enable prompting for a variety of advanced kernel
737 configuration options. These options can cause the kernel to not
738 work if they are set incorrectly, but can be used to optimize certain
739 aspects of kernel memory management.
740
741 Unless you know what you are doing, say N here.
742
743comment "Default settings for advanced configuration options are used"
744 depends on !ADVANCED_OPTIONS
745
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000746config LOWMEM_SIZE_BOOL
747 bool "Set maximum low memory"
748 depends on ADVANCED_OPTIONS
749 help
750 This option allows you to set the maximum amount of memory which
751 will be used as "low memory", that is, memory which the kernel can
752 access directly, without having to set up a kernel virtual mapping.
753 This can be useful in optimizing the layout of kernel virtual
754 memory.
755
756 Say N here unless you know what you are doing.
757
758config LOWMEM_SIZE
759 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
760 default "0x30000000"
761
Trent Piepho96051462008-12-08 19:34:58 -0800762config LOWMEM_CAM_NUM_BOOL
763 bool "Set number of CAMs to use to map low memory"
764 depends on ADVANCED_OPTIONS && FSL_BOOKE
765 help
766 This option allows you to set the maximum number of CAM slots that
767 will be used to map low memory. There are a limited number of slots
768 available and even more limited number that will fit in the L1 MMU.
769 However, using more entries will allow mapping more low memory. This
770 can be useful in optimizing the layout of kernel virtual memory.
771
772 Say N here unless you know what you are doing.
773
774config LOWMEM_CAM_NUM
775 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
776 default 3
777
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000778config RELOCATABLE
779 bool "Build a relocatable kernel (EXPERIMENTAL)"
780 depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
781 help
782 This builds a kernel image that is capable of running at the
783 location the kernel is loaded at (some alignment restrictions may
784 exist).
785
786 One use is for the kexec on panic case where the recovery kernel
787 must live at a different physical address than the primary
788 kernel.
789
790 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
791 it has been loaded at and the compile time physical addresses
792 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
793 setting can still be useful to bootwrappers that need to know the
794 load location of the kernel (eg. u-boot/mkimage).
795
796config PAGE_OFFSET_BOOL
797 bool "Set custom page offset address"
798 depends on ADVANCED_OPTIONS
799 help
800 This option allows you to set the kernel virtual address at which
801 the kernel will map low memory. This can be useful in optimizing
802 the virtual memory layout of the system.
803
804 Say N here unless you know what you are doing.
805
806config PAGE_OFFSET
807 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
808 default "0xc0000000"
809
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000810config KERNEL_START_BOOL
811 bool "Set custom kernel base address"
812 depends on ADVANCED_OPTIONS
813 help
814 This option allows you to set the kernel virtual address at which
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000815 the kernel will be loaded. Normally this should match PAGE_OFFSET
816 however there are times (like kdump) that one might not want them
817 to be the same.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000818
819 Say N here unless you know what you are doing.
820
821config KERNEL_START
822 hex "Virtual address of kernel base" if KERNEL_START_BOOL
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000823 default PAGE_OFFSET if PAGE_OFFSET_BOOL
824 default "0xc2000000" if CRASH_DUMP
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000825 default "0xc0000000"
826
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000827config PHYSICAL_START_BOOL
828 bool "Set physical address where the kernel is loaded"
829 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
830 help
831 This gives the physical address where the kernel is loaded.
832
833 Say N here unless you know what you are doing.
834
835config PHYSICAL_START
836 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
837 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
838 default "0x00000000"
839
840config PHYSICAL_ALIGN
841 hex
Trent Piephoc8f35702008-12-08 19:34:59 -0800842 default "0x04000000" if FSL_BOOKE
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000843 help
844 This value puts the alignment restrictions on physical address
845 where kernel is loaded and run from. Kernel is compiled for an
846 address which meets above alignment restriction.
847
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000848config TASK_SIZE_BOOL
849 bool "Set custom user task size"
850 depends on ADVANCED_OPTIONS
851 help
852 This option allows you to set the amount of virtual address space
853 allocated to user tasks. This can be useful in optimizing the
854 virtual memory layout of the system.
855
856 Say N here unless you know what you are doing.
857
858config TASK_SIZE
859 hex "Size of user task space" if TASK_SIZE_BOOL
Kumar Gala4d9e55102007-10-11 13:40:21 -0500860 default "0x80000000" if PPC_PREP || PPC_8xx
861 default "0xc0000000"
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000862
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000863config PIN_TLB
864 bool "Pinned Kernel TLBs (860 ONLY)"
865 depends on ADVANCED_OPTIONS && 8xx
866endmenu
867
Stephen Rothwellcabb5582005-09-30 16:16:52 +1000868if PPC64
Paul Mackerras549e8152008-08-30 11:43:47 +1000869config RELOCATABLE
870 bool "Build a relocatable kernel"
871 help
872 This builds a kernel image that is capable of running anywhere
873 in the RMA (real memory area) at any 16k-aligned base address.
874 The kernel is linked as a position-independent executable (PIE)
875 and contains dynamic relocations which are processed early
876 in the bootup process.
877
878 One use is for the kexec on panic case where the recovery kernel
879 must live at a different physical address than the primary
880 kernel.
881
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000882config PAGE_OFFSET
Stephen Rothwellcabb5582005-09-30 16:16:52 +1000883 hex
Stephen Rothwelleeb2d212005-09-30 17:24:15 +1000884 default "0xc000000000000000"
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000885config KERNEL_START
886 hex
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000887 default "0xc000000000000000"
888config PHYSICAL_START
889 hex
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000890 default "0x00000000"
Stephen Rothwellcabb5582005-09-30 16:16:52 +1000891endif
892
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000893source "net/Kconfig"
894
895source "drivers/Kconfig"
896
897source "fs/Kconfig"
898
Li Yang98658532006-10-03 23:10:46 -0500899source "arch/powerpc/sysdev/qe_lib/Kconfig"
900
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000901source "lib/Kconfig"
902
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000903source "arch/powerpc/Kconfig.debug"
904
905source "security/Kconfig"
906
907config KEYS_COMPAT
908 bool
909 depends on COMPAT && KEYS
910 default y
911
912source "crypto/Kconfig"
Domen Puncer6f668282007-09-21 00:00:11 +1000913
914config PPC_CLOCK
915 bool
916 default n
David Brownell9483a572008-07-23 21:26:48 -0700917 select HAVE_CLK
Sylvain Munaut1088a202007-09-16 20:53:25 +1000918
919config PPC_LIB_RHEAP
920 bool
921
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500922source "arch/powerpc/kvm/Kconfig"