tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1# 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
7source "arch/powerpc/platforms/Kconfig.cputype"
8
9config PPC32
10 bool
11 default y if !PPC64
12
13config 64BIT
14 bool
15 default y if PPC64
16
17config PPC_MERGE
18 def_bool y
19
20config MMU
21 bool
22 default y
23
24config GENERIC_HARDIRQS
25 bool
26 default y
27
28config IRQ_PER_CPU
29 bool
30 default y
31
32config RWSEM_GENERIC_SPINLOCK
33 bool
34
35config RWSEM_XCHGADD_ALGORITHM
36 bool
37 default y
38
39config ARCH_HAS_ILOG2_U32
40 bool
41 default y
42
43config ARCH_HAS_ILOG2_U64
44 bool
45 default y if 64BIT
46
47config GENERIC_HWEIGHT
48 bool
49 default y
50
51config GENERIC_CALIBRATE_DELAY
52 bool
53 default y
54
55config GENERIC_FIND_NEXT_BIT
56 bool
57 default y
58
59config ARCH_NO_VIRT_TO_BUS
60 def_bool PPC64
61
62config PPC
63 bool
64 default y
65
66config EARLY_PRINTK
67 bool
68 default y
69
70config COMPAT
71 bool
72 default y if PPC64
73
74config SYSVIPC_COMPAT
75 bool
76 depends on COMPAT && SYSVIPC
77 default y
78
79# All PPC32s use generic nvram driver through ppc_md
80config GENERIC_NVRAM
81 bool
82 default y if PPC32
83
84config SCHED_NO_NO_OMIT_FRAME_POINTER
85 bool
86 default y
87
88config ARCH_MAY_HAVE_PC_FDC
89 bool
90 default !PPC_PSERIES || PCI
91
92config PPC_OF
93 def_bool y
94
95config OF
96 def_bool y
97
98config PPC_UDBG_16550
99 bool
100 default n
101
102config GENERIC_TBSYNC
103 bool
104 default y if PPC32 && SMP
105 default n
106
107config AUDIT_ARCH
108 bool
109 default y
110
111config GENERIC_BUG
112 bool
113 default y
114 depends on BUG
115
116config SYS_SUPPORTS_APM_EMULATION
117 default y if PMAC_APM_EMU
118 bool
119
120config DEFAULT_UIMAGE
121 bool
122 help
123 Used to allow a board to specify it wants a uImage built by default
124 default n
125
126config PPC64_SWSUSP
127 bool
128 depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
129 default y
130
131config PPC_DCR_NATIVE
132 bool
133 default n
134
135config PPC_DCR_MMIO
136 bool
137 default n
138
139config PPC_DCR
140 bool
141 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
142 default y
143
144config PPC_OF_PLATFORM_PCI
145 bool
146 depends on PPC64 # not supported on 32 bits yet
147 default n
148
149source "init/Kconfig"
150
151source "arch/powerpc/platforms/Kconfig"
152
153menu "Kernel options"
154
155config HIGHMEM
156 bool "High memory support"
157 depends on PPC32
158
159source kernel/Kconfig.hz
160source kernel/Kconfig.preempt
161source "fs/Kconfig.binfmt"
162
163# We optimistically allocate largepages from the VM, so make the limit
164# large enough (16MB). This badly named config option is actually
165# max order + 1
166config FORCE_MAX_ZONEORDER
167 int
168 depends on PPC64
169 default "9" if PPC_64K_PAGES
170 default "13"
171
172config MATH_EMULATION
173 bool "Math emulation"
174 depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
175 ---help---
176 Some PowerPC chips designed for embedded applications do not have
177 a floating-point unit and therefore do not implement the
178 floating-point instructions in the PowerPC instruction set. If you
179 say Y here, the kernel will include code to emulate a floating-point
180 unit, which will allow programs that use floating-point
181 instructions to run.
182
183config IOMMU_VMERGE
184 bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
185 depends on EXPERIMENTAL && PPC64
186 default n
187 help
188 Cause IO segments sent to a device for DMA to be merged virtually
189 by the IOMMU when they happen to have been allocated contiguously.
190 This doesn't add pressure to the IOMMU allocator. However, some
191 drivers don't support getting large merged segments coming back
192 from *_map_sg(). Say Y if you know the drivers you are using are
193 properly handling this case.
194
195config HOTPLUG_CPU
196 bool "Support for enabling/disabling CPUs"
197 depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
198 ---help---
199 Say Y here to be able to disable and re-enable individual
200 CPUs at runtime on SMP machines.
201
202 Say N if you are unsure.
203
204config ARCH_ENABLE_MEMORY_HOTPLUG
205 def_bool y
206
207config KEXEC
208 bool "kexec system call (EXPERIMENTAL)"
209 depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
210 help
211 kexec is a system call that implements the ability to shutdown your
212 current kernel, and to start another kernel. It is like a reboot
213 but it is independent of the system firmware. And like a reboot
214 you can start any kernel with it, not just Linux.
215
216 The name comes from the similarity to the exec system call.
217
218 It is an ongoing process to be certain the hardware in a machine
219 is properly shutdown, so do not be surprised if this code does not
220 initially work for you. It may help to enable device hotplugging
221 support. As of this writing the exact hardware interface is
222 strongly in flux, so no good recommendation can be made.
223
224config CRASH_DUMP
225 bool "Build a kdump crash kernel (EXPERIMENTAL)"
226 depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
227 help
228 Build a kernel suitable for use as a kdump capture kernel.
229 The kernel will be linked at a different address than normal, and
230 so can only be used for Kdump.
231
232 Don't change this unless you know what you are doing.
233
234config PPCBUG_NVRAM
235 bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
236 default y if PPC_PREP
237
238config IRQ_ALL_CPUS
239 bool "Distribute interrupts on all CPUs by default"
240 depends on SMP && !MV64360
241 help
242 This option gives the kernel permission to distribute IRQs across
243 multiple CPUs. Saying N here will route all IRQs to the first
244 CPU. Generally saying Y is safe, although some problems have been
245 reported with SMP Power Macintoshes with this option enabled.
246
247config NUMA
248 bool "NUMA support"
249 depends on PPC64
250 default y if SMP && PPC_PSERIES
251
252config NODES_SHIFT
253 int
254 default "4"
255 depends on NEED_MULTIPLE_NODES
256
257config ARCH_SELECT_MEMORY_MODEL
258 def_bool y
259 depends on PPC64
260
261config ARCH_FLATMEM_ENABLE
262 def_bool y
263 depends on (PPC64 && !NUMA) || PPC32
264
265config ARCH_SPARSEMEM_ENABLE
266 def_bool y
267 depends on PPC64
268
269config ARCH_SPARSEMEM_DEFAULT
270 def_bool y
271 depends on (SMP && PPC_PSERIES) || PPC_PS3
272
273config ARCH_POPULATES_NODE_MAP
274 def_bool y
275
276source "mm/Kconfig"
277
278config ARCH_MEMORY_PROBE
279 def_bool y
280 depends on MEMORY_HOTPLUG
281
282# Some NUMA nodes have memory ranges that span
283# other nodes. Even though a pfn is valid and
284# between a node's start and end pfns, it may not
285# reside on that node. See memmap_init_zone()
286# for details.
287config NODES_SPAN_OTHER_NODES
288 def_bool y
289 depends on NEED_MULTIPLE_NODES
290
291config PPC_HAS_HASH_64K
292 bool
293 depends on PPC64
294 default n
295
296config PPC_64K_PAGES
297 bool "64k page size"
298 depends on PPC64
299 select PPC_HAS_HASH_64K
300 help
301 This option changes the kernel logical page size to 64k. On machines
302 without processor support for 64k pages, the kernel will simulate
303 them by loading each individual 4k page on demand transparently,
304 while on hardware with such support, it will be used to map
305 normal application pages.
306
307config SCHED_SMT
308 bool "SMT (Hyperthreading) scheduler support"
309 depends on PPC64 && SMP
310 help
311 SMT scheduler support improves the CPU scheduler's decision making
312 when dealing with POWER5 cpus at a cost of slightly increased
313 overhead in some places. If unsure say N here.
314
315config PROC_DEVICETREE
316 bool "Support for device tree in /proc"
317 depends on PROC_FS
318 help
319 This option adds a device-tree directory under /proc which contains
320 an image of the device tree that the kernel copies from Open
321 Firmware or other boot firmware. If unsure, say Y here.
322
323config CMDLINE_BOOL
324 bool "Default bootloader kernel arguments"
325
326config CMDLINE
327 string "Initial kernel command string"
328 depends on CMDLINE_BOOL
329 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
330 help
331 On some platforms, there is currently no way for the boot loader to
332 pass arguments to the kernel. For these platforms, you can supply
333 some command-line options at build time by entering them here. In
334 most cases you will need to specify the root device here.
335
336if !44x || BROKEN
337source kernel/power/Kconfig
338endif
339
340config SECCOMP
341 bool "Enable seccomp to safely compute untrusted bytecode"
342 depends on PROC_FS
343 default y
344 help
345 This kernel feature is useful for number crunching applications
346 that may need to compute untrusted bytecode during their
347 execution. By using pipes or other transports made available to
348 the process as file descriptors supporting the read/write
349 syscalls, it's possible to isolate those applications in
350 their own address space using seccomp. Once seccomp is
351 enabled via /proc/<pid>/seccomp, it cannot be disabled
352 and the task is only allowed to execute a few safe syscalls
353 defined by each seccomp mode.
354
355 If unsure, say Y. Only embedded should say N here.
356
357config WANT_DEVICE_TREE
358 bool
359 default n
360
361config DEVICE_TREE
362 string "Static device tree source file"
363 depends on WANT_DEVICE_TREE
364 help
365 This specifies the device tree source (.dts) file to be
366 compiled and included when building the bootwrapper. If a
367 relative filename is given, then it will be relative to
368 arch/powerpc/boot/dts. If you are not using the bootwrapper,
369 or do not need to build a dts into the bootwrapper, this
370 field is ignored.
371
372 For example, this is required when building a cuImage target
373 for an older U-Boot, which cannot pass a device tree itself.
374 Such a kernel will not work with a newer U-Boot that tries to
375 pass a device tree (unless you tell it not to). If your U-Boot
376 does not mention a device tree in "help bootm", then use the
377 cuImage target and specify a device tree here. Otherwise, use
378 the uImage target and leave this field blank.
379
380endmenu
381
382config ISA_DMA_API
383 bool
384 default y
385
386menu "Bus options"
387
388config ISA
389 bool "Support for ISA-bus hardware"
390 depends on PPC_PREP || PPC_CHRP
391 select PPC_I8259
392 help
393 Find out whether you have ISA slots on your motherboard. ISA is the
394 name of a bus system, i.e. the way the CPU talks to the other stuff
395 inside your box. If you have an Apple machine, say N here; if you
396 have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
397 you have an embedded board, consult your board documentation.
398
399config ZONE_DMA
400 bool
401 default y
402
403config GENERIC_ISA_DMA
404 bool
405 depends on PPC64 || POWER4 || 6xx && !CPM2
406 default y
407
408config PPC_INDIRECT_PCI
409 bool
410 depends on PCI
411 default y if 40x || 44x
412 default n
413
414config EISA
415 bool
416
417config SBUS
418 bool
419
420config FSL_SOC
421 bool
422
423config FSL_PCI
424 bool
425 select PPC_INDIRECT_PCI
426
427# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
428config MCA
429 bool
430
431config PCI
432 bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
433 || PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
434 || PPC_PS3
435 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
436 && !PPC_85xx && !PPC_86xx
437 default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
438 default PCI_QSPAN if !4xx && !CPM2 && 8xx
439 select ARCH_SUPPORTS_MSI
440 help
441 Find out whether your system includes a PCI bus. PCI is the name of
442 a bus system, i.e. the way the CPU talks to the other stuff inside
443 your box. If you say Y here, the kernel will include drivers and
444 infrastructure code to support PCI bus devices.
445
446config PCI_DOMAINS
447 def_bool PCI
448
449config PCI_SYSCALL
450 def_bool PCI
451
452config PCI_QSPAN
453 bool "QSpan PCI"
454 depends on !4xx && !CPM2 && 8xx
455 select PPC_I8259
456 help
457 Say Y here if you have a system based on a Motorola 8xx-series
458 embedded processor with a QSPAN PCI interface, otherwise say N.
459
460config PCI_8260
461 bool
462 depends on PCI && 8260
463 select PPC_INDIRECT_PCI
464 default y
465
466config 8260_PCI9
467 bool "Enable workaround for MPC826x erratum PCI 9"
468 depends on PCI_8260 && !ADS8272
469 default y
470
471choice
472 prompt "IDMA channel for PCI 9 workaround"
473 depends on 8260_PCI9
474
475config 8260_PCI9_IDMA1
476 bool "IDMA1"
477
478config 8260_PCI9_IDMA2
479 bool "IDMA2"
480
481config 8260_PCI9_IDMA3
482 bool "IDMA3"
483
484config 8260_PCI9_IDMA4
485 bool "IDMA4"
486
487endchoice
488
489source "drivers/pci/pcie/Kconfig"
490
491source "drivers/pci/Kconfig"
492
493source "drivers/pcmcia/Kconfig"
494
495source "drivers/pci/hotplug/Kconfig"
496
497endmenu
498
499menu "Advanced setup"
500 depends on PPC32
501
502config ADVANCED_OPTIONS
503 bool "Prompt for advanced kernel configuration options"
504 help
505 This option will enable prompting for a variety of advanced kernel
506 configuration options. These options can cause the kernel to not
507 work if they are set incorrectly, but can be used to optimize certain
508 aspects of kernel memory management.
509
510 Unless you know what you are doing, say N here.
511
512comment "Default settings for advanced configuration options are used"
513 depends on !ADVANCED_OPTIONS
514
515config HIGHMEM_START_BOOL
516 bool "Set high memory pool address"
517 depends on ADVANCED_OPTIONS && HIGHMEM
518 help
519 This option allows you to set the base address of the kernel virtual
520 area used to map high memory pages. This can be useful in
521 optimizing the layout of kernel virtual memory.
522
523 Say N here unless you know what you are doing.
524
525config HIGHMEM_START
526 hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
527 default "0xfe000000"
528
529config LOWMEM_SIZE_BOOL
530 bool "Set maximum low memory"
531 depends on ADVANCED_OPTIONS
532 help
533 This option allows you to set the maximum amount of memory which
534 will be used as "low memory", that is, memory which the kernel can
535 access directly, without having to set up a kernel virtual mapping.
536 This can be useful in optimizing the layout of kernel virtual
537 memory.
538
539 Say N here unless you know what you are doing.
540
541config LOWMEM_SIZE
542 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
543 default "0x30000000"
544
545config KERNEL_START_BOOL
546 bool "Set custom kernel base address"
547 depends on ADVANCED_OPTIONS
548 help
549 This option allows you to set the kernel virtual address at which
550 the kernel will map low memory (the kernel image will be linked at
551 this address). This can be useful in optimizing the virtual memory
552 layout of the system.
553
554 Say N here unless you know what you are doing.
555
556config KERNEL_START
557 hex "Virtual address of kernel base" if KERNEL_START_BOOL
558 default "0xc0000000"
559
560config TASK_SIZE_BOOL
561 bool "Set custom user task size"
562 depends on ADVANCED_OPTIONS
563 help
564 This option allows you to set the amount of virtual address space
565 allocated to user tasks. This can be useful in optimizing the
566 virtual memory layout of the system.
567
568 Say N here unless you know what you are doing.
569
570config TASK_SIZE
571 hex "Size of user task space" if TASK_SIZE_BOOL
572 default "0x80000000"
573
574config CONSISTENT_START_BOOL
575 bool "Set custom consistent memory pool address"
576 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
577 help
578 This option allows you to set the base virtual address
579 of the consistent memory pool. This pool of virtual
580 memory is used to make consistent memory allocations.
581
582config CONSISTENT_START
583 hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
584 default "0xff100000" if NOT_COHERENT_CACHE
585
586config CONSISTENT_SIZE_BOOL
587 bool "Set custom consistent memory pool size"
588 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
589 help
590 This option allows you to set the size of the
591 consistent memory pool. This pool of virtual memory
592 is used to make consistent memory allocations.
593
594config CONSISTENT_SIZE
595 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
596 default "0x00200000" if NOT_COHERENT_CACHE
597
598config BOOT_LOAD_BOOL
599 bool "Set the boot link/load address"
600 depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
601 help
602 This option allows you to set the initial load address of the zImage
603 or zImage.initrd file. This can be useful if you are on a board
604 which has a small amount of memory.
605
606 Say N here unless you know what you are doing.
607
608config BOOT_LOAD
609 hex "Link/load address for booting" if BOOT_LOAD_BOOL
610 default "0x00400000" if 40x || 8xx || 8260
611 default "0x01000000" if 44x
612 default "0x00800000"
613
614config PIN_TLB
615 bool "Pinned Kernel TLBs (860 ONLY)"
616 depends on ADVANCED_OPTIONS && 8xx
617endmenu
618
619if PPC64
620config KERNEL_START
621 hex
622 default "0xc000000000000000"
623endif
624
625source "net/Kconfig"
626
627source "drivers/Kconfig"
628
629source "fs/Kconfig"
630
631# XXX source "arch/ppc/8xx_io/Kconfig"
632
633# XXX source "arch/ppc/8260_io/Kconfig"
634
635source "arch/powerpc/sysdev/qe_lib/Kconfig"
636
637source "lib/Kconfig"
638
639menu "Instrumentation Support"
640 depends on EXPERIMENTAL
641
642source "arch/powerpc/oprofile/Kconfig"
643
644config KPROBES
645 bool "Kprobes"
646 depends on !BOOKE && !4xx && KALLSYMS && MODULES
647 help
648 Kprobes allows you to trap at almost any kernel address and
649 execute a callback function. register_kprobe() establishes
650 a probepoint and specifies the callback. Kprobes is useful
651 for kernel debugging, non-intrusive instrumentation and testing.
652 If in doubt, say "N".
653endmenu
654
655source "arch/powerpc/Kconfig.debug"
656
657source "security/Kconfig"
658
659config KEYS_COMPAT
660 bool
661 depends on COMPAT && KEYS
662 default y
663
664source "crypto/Kconfig"