Root/arch/powerpc/Kconfig

1source "arch/powerpc/platforms/Kconfig.cputype"
2
3config PPC32
4    bool
5    default y if !PPC64
6
7config 32BIT
8    bool
9    default y if PPC32
10
11config 64BIT
12    bool
13    default y if PPC64
14
15config WORD_SIZE
16    int
17    default 64 if PPC64
18    default 32 if !PPC64
19
20config ARCH_PHYS_ADDR_T_64BIT
21       def_bool PPC64 || PHYS_64BIT
22
23config MMU
24    bool
25    default y
26
27config GENERIC_CMOS_UPDATE
28    def_bool y
29
30config GENERIC_TIME_VSYSCALL
31    def_bool y
32
33config GENERIC_CLOCKEVENTS
34    def_bool y
35
36config GENERIC_HARDIRQS
37    bool
38    default y
39
40config GENERIC_HARDIRQS_NO__DO_IRQ
41    bool
42    default y
43
44config HAVE_SETUP_PER_CPU_AREA
45    def_bool PPC64
46
47config NEED_PER_CPU_EMBED_FIRST_CHUNK
48    def_bool PPC64
49
50config IRQ_PER_CPU
51    bool
52    default y
53
54config NR_IRQS
55    int "Number of virtual interrupt numbers"
56    range 32 32768
57    default "512"
58    help
59      This defines the number of virtual interrupt numbers the kernel
60      can manage. Virtual interrupt numbers are what you see in
61      /proc/interrupts. If you configure your system to have too few,
62      drivers will fail to load or worse - handle with care.
63
64config STACKTRACE_SUPPORT
65    bool
66    default y
67
68config HAVE_LATENCYTOP_SUPPORT
69    def_bool y
70
71config TRACE_IRQFLAGS_SUPPORT
72    bool
73    default y
74
75config LOCKDEP_SUPPORT
76    bool
77    default y
78
79config RWSEM_GENERIC_SPINLOCK
80    bool
81
82config RWSEM_XCHGADD_ALGORITHM
83    bool
84    default y
85
86config GENERIC_LOCKBREAK
87    bool
88    default y
89    depends on SMP && PREEMPT
90
91config ARCH_HAS_ILOG2_U32
92    bool
93    default y
94
95config ARCH_HAS_ILOG2_U64
96    bool
97    default y if 64BIT
98
99config GENERIC_HWEIGHT
100    bool
101    default y
102
103config GENERIC_FIND_NEXT_BIT
104    bool
105    default y
106
107config GENERIC_GPIO
108    bool
109    help
110      Generic GPIO API support
111
112config ARCH_NO_VIRT_TO_BUS
113    def_bool PPC64
114
115config PPC
116    bool
117    default y
118    select OF
119    select OF_FLATTREE
120    select HAVE_FTRACE_MCOUNT_RECORD
121    select HAVE_DYNAMIC_FTRACE
122    select HAVE_FUNCTION_TRACER
123    select HAVE_FUNCTION_GRAPH_TRACER
124    select ARCH_WANT_OPTIONAL_GPIOLIB
125    select HAVE_IDE
126    select HAVE_IOREMAP_PROT
127    select HAVE_EFFICIENT_UNALIGNED_ACCESS
128    select HAVE_KPROBES
129    select HAVE_ARCH_KGDB
130    select HAVE_KRETPROBES
131    select HAVE_ARCH_TRACEHOOK
132    select HAVE_MEMBLOCK
133    select HAVE_DMA_ATTRS
134    select HAVE_DMA_API_DEBUG
135    select USE_GENERIC_SMP_HELPERS if SMP
136    select HAVE_OPROFILE
137    select HAVE_SYSCALL_WRAPPERS if PPC64
138    select GENERIC_ATOMIC64 if PPC32
139    select HAVE_IRQ_WORK
140    select HAVE_PERF_EVENTS
141    select HAVE_REGS_AND_STACK_ACCESS_API
142    select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
143
144config EARLY_PRINTK
145    bool
146    default y
147
148config COMPAT
149    bool
150    default y if PPC64
151    select COMPAT_BINFMT_ELF
152
153config SYSVIPC_COMPAT
154    bool
155    depends on COMPAT && SYSVIPC
156    default y
157
158# All PPC32s use generic nvram driver through ppc_md
159config GENERIC_NVRAM
160    bool
161    default y if PPC32
162
163config SCHED_OMIT_FRAME_POINTER
164    bool
165    default y
166
167config ARCH_MAY_HAVE_PC_FDC
168    bool
169    default !PPC_PSERIES || PCI
170
171config PPC_OF
172    def_bool y
173
174config PPC_UDBG_16550
175    bool
176    default n
177
178config GENERIC_TBSYNC
179    bool
180    default y if PPC32 && SMP
181    default n
182
183config AUDIT_ARCH
184    bool
185    default y
186
187config GENERIC_BUG
188    bool
189    default y
190    depends on BUG
191
192config SYS_SUPPORTS_APM_EMULATION
193    default y if PMAC_APM_EMU
194    bool
195
196config DEFAULT_UIMAGE
197    bool
198    help
199      Used to allow a board to specify it wants a uImage built by default
200    default n
201
202config REDBOOT
203    bool
204
205config ARCH_HIBERNATION_POSSIBLE
206    bool
207    default y
208
209config ARCH_SUSPEND_POSSIBLE
210    def_bool y
211    depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
212           PPC_85xx || PPC_86xx || PPC_PSERIES
213
214config PPC_DCR_NATIVE
215    bool
216    default n
217
218config PPC_DCR_MMIO
219    bool
220    default n
221
222config PPC_DCR
223    bool
224    depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
225    default y
226
227config PPC_OF_PLATFORM_PCI
228    bool
229    depends on PCI
230    depends on PPC64 # not supported on 32 bits yet
231    default n
232
233config ARCH_SUPPORTS_DEBUG_PAGEALLOC
234    def_bool y
235
236config PPC_ADV_DEBUG_REGS
237    bool
238    depends on 40x || BOOKE
239    default y
240
241config PPC_ADV_DEBUG_IACS
242    int
243    depends on PPC_ADV_DEBUG_REGS
244    default 4 if 44x
245    default 2
246
247config PPC_ADV_DEBUG_DACS
248    int
249    depends on PPC_ADV_DEBUG_REGS
250    default 2
251
252config PPC_ADV_DEBUG_DVCS
253    int
254    depends on PPC_ADV_DEBUG_REGS
255    default 2 if 44x
256    default 0
257
258config PPC_ADV_DEBUG_DAC_RANGE
259    bool
260    depends on PPC_ADV_DEBUG_REGS && 44x
261    default y
262
263source "init/Kconfig"
264
265source "kernel/Kconfig.freezer"
266
267source "arch/powerpc/sysdev/Kconfig"
268source "arch/powerpc/platforms/Kconfig"
269
270menu "Kernel options"
271
272config HIGHMEM
273    bool "High memory support"
274    depends on PPC32
275
276source kernel/time/Kconfig
277source kernel/Kconfig.hz
278source kernel/Kconfig.preempt
279source "fs/Kconfig.binfmt"
280
281config HUGETLB_PAGE_SIZE_VARIABLE
282    bool
283    depends on HUGETLB_PAGE
284    default y
285
286config MATH_EMULATION
287    bool "Math emulation"
288    depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
289    ---help---
290      Some PowerPC chips designed for embedded applications do not have
291      a floating-point unit and therefore do not implement the
292      floating-point instructions in the PowerPC instruction set. If you
293      say Y here, the kernel will include code to emulate a floating-point
294      unit, which will allow programs that use floating-point
295      instructions to run.
296
297config 8XX_MINIMAL_FPEMU
298    bool "Minimal math emulation for 8xx"
299    depends on 8xx && !MATH_EMULATION
300    help
301      Older arch/ppc kernels still emulated a few floating point
302      instructions such as load and store, even when full math
303      emulation is disabled. Say "Y" here if you want to preserve
304      this behavior.
305
306      It is recommended that you build a soft-float userspace instead.
307
308config IOMMU_HELPER
309    def_bool PPC64
310
311config SWIOTLB
312    bool "SWIOTLB support"
313    default n
314    select IOMMU_HELPER
315    ---help---
316      Support for IO bounce buffering for systems without an IOMMU.
317      This allows us to DMA to the full physical address space on
318      platforms where the size of a physical address is larger
319      than the bus address. Not all platforms support this.
320
321config HOTPLUG_CPU
322    bool "Support for enabling/disabling CPUs"
323    depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
324    ---help---
325      Say Y here to be able to disable and re-enable individual
326      CPUs at runtime on SMP machines.
327
328      Say N if you are unsure.
329
330config ARCH_CPU_PROBE_RELEASE
331    def_bool y
332    depends on HOTPLUG_CPU
333
334config ARCH_ENABLE_MEMORY_HOTPLUG
335    def_bool y
336
337config ARCH_HAS_WALK_MEMORY
338    def_bool y
339
340config ARCH_ENABLE_MEMORY_HOTREMOVE
341    def_bool y
342
343config KEXEC
344    bool "kexec system call (EXPERIMENTAL)"
345    depends on (PPC_BOOK3S || FSL_BOOKE) && EXPERIMENTAL
346    help
347      kexec is a system call that implements the ability to shutdown your
348      current kernel, and to start another kernel. It is like a reboot
349      but it is independent of the system firmware. And like a reboot
350      you can start any kernel with it, not just Linux.
351
352      The name comes from the similarity to the exec system call.
353
354      It is an ongoing process to be certain the hardware in a machine
355      is properly shutdown, so do not be surprised if this code does not
356      initially work for you. It may help to enable device hotplugging
357      support. As of this writing the exact hardware interface is
358      strongly in flux, so no good recommendation can be made.
359
360config CRASH_DUMP
361    bool "Build a kdump crash kernel"
362    depends on PPC64 || 6xx || FSL_BOOKE
363    select RELOCATABLE if PPC64 || FSL_BOOKE
364    help
365      Build a kernel suitable for use as a kdump capture kernel.
366      The same kernel binary can be used as production kernel and dump
367      capture kernel.
368
369config PHYP_DUMP
370    bool "Hypervisor-assisted dump (EXPERIMENTAL)"
371    depends on PPC_PSERIES && EXPERIMENTAL
372    help
373      Hypervisor-assisted dump is meant to be a kdump replacement
374      offering robustness and speed not possible without system
375      hypervisor assistance.
376
377      If unsure, say "N"
378
379config PPCBUG_NVRAM
380    bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
381    default y if PPC_PREP
382
383config IRQ_ALL_CPUS
384    bool "Distribute interrupts on all CPUs by default"
385    depends on SMP && !MV64360
386    help
387      This option gives the kernel permission to distribute IRQs across
388      multiple CPUs. Saying N here will route all IRQs to the first
389      CPU. Generally saying Y is safe, although some problems have been
390      reported with SMP Power Macintoshes with this option enabled.
391
392config SPARSE_IRQ
393    bool "Support sparse irq numbering"
394    default n
395    help
396      This enables support for sparse irqs. This is useful for distro
397      kernels that want to define a high CONFIG_NR_CPUS value but still
398      want to have low kernel memory footprint on smaller machines.
399
400      ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
401        out the irq_desc[] array in a more NUMA-friendly way. )
402
403      If you don't know what to do here, say N.
404
405config NUMA
406    bool "NUMA support"
407    depends on PPC64
408    default y if SMP && PPC_PSERIES
409
410config NODES_SHIFT
411    int
412    default "8" if PPC64
413    default "4"
414    depends on NEED_MULTIPLE_NODES
415
416config MAX_ACTIVE_REGIONS
417    int
418    default "256" if PPC64
419    default "32"
420
421config ARCH_SELECT_MEMORY_MODEL
422    def_bool y
423    depends on PPC64
424
425config ARCH_FLATMEM_ENABLE
426    def_bool y
427    depends on (PPC64 && !NUMA) || PPC32
428
429config ARCH_SPARSEMEM_ENABLE
430    def_bool y
431    depends on PPC64
432    select SPARSEMEM_VMEMMAP_ENABLE
433
434config ARCH_SPARSEMEM_DEFAULT
435    def_bool y
436    depends on (SMP && PPC_PSERIES) || PPC_PS3
437
438config ARCH_POPULATES_NODE_MAP
439    def_bool y
440
441config SYS_SUPPORTS_HUGETLBFS
442       def_bool y
443       depends on PPC_BOOK3S_64
444
445source "mm/Kconfig"
446
447config ARCH_MEMORY_PROBE
448    def_bool y
449    depends on MEMORY_HOTPLUG
450
451# Some NUMA nodes have memory ranges that span
452# other nodes. Even though a pfn is valid and
453# between a node's start and end pfns, it may not
454# reside on that node. See memmap_init_zone()
455# for details.
456config NODES_SPAN_OTHER_NODES
457    def_bool y
458    depends on NEED_MULTIPLE_NODES
459
460config PPC_HAS_HASH_64K
461    bool
462    depends on PPC64
463    default n
464
465config STDBINUTILS
466    bool "Using standard binutils settings"
467    depends on 44x
468    default y
469    help
470      Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
471      Note, that kernel will be able to run only those applications,
472      which had been compiled using binutils later than 2.17.50.0.3 with
473      '-zmax-page-size' set to 256K (the default is 64K). Or, if using
474      the older binutils, you can patch them with a trivial patch, which
475      changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
476
477choice
478    prompt "Page size"
479    default PPC_4K_PAGES
480    help
481      Select the kernel logical page size. Increasing the page size
482      will reduce software overhead at each page boundary, allow
483      hardware prefetch mechanisms to be more effective, and allow
484      larger dma transfers increasing IO efficiency and reducing
485      overhead. However the utilization of memory will increase.
486      For example, each cached file will using a multiple of the
487      page size to hold its contents and the difference between the
488      end of file and the end of page is wasted.
489
490      Some dedicated systems, such as software raid serving with
491      accelerated calculations, have shown significant increases.
492
493      If you configure a 64 bit kernel for 64k pages but the
494      processor does not support them, then the kernel will simulate
495      them with 4k pages, loading them on demand, but with the
496      reduced software overhead and larger internal fragmentation.
497      For the 32 bit kernel, a large page option will not be offered
498      unless it is supported by the configured processor.
499
500      If unsure, choose 4K_PAGES.
501
502config PPC_4K_PAGES
503    bool "4k page size"
504
505config PPC_16K_PAGES
506    bool "16k page size" if 44x
507
508config PPC_64K_PAGES
509    bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
510    select PPC_HAS_HASH_64K if PPC_STD_MMU_64
511
512config PPC_256K_PAGES
513    bool "256k page size" if 44x
514    depends on !STDBINUTILS
515    help
516      Make the page size 256k.
517
518      As the ELF standard only requires alignment to support page
519      sizes up to 64k, you will need to compile all of your user
520      space applications with a non-standard binutils settings
521      (see the STDBINUTILS description for details).
522
523      Say N unless you know what you are doing.
524
525endchoice
526
527config FORCE_MAX_ZONEORDER
528    int "Maximum zone order"
529    range 9 64 if PPC64 && PPC_64K_PAGES
530    default "9" if PPC64 && PPC_64K_PAGES
531    range 13 64 if PPC64 && !PPC_64K_PAGES
532    default "13" if PPC64 && !PPC_64K_PAGES
533    range 9 64 if PPC32 && PPC_16K_PAGES
534    default "9" if PPC32 && PPC_16K_PAGES
535    range 7 64 if PPC32 && PPC_64K_PAGES
536    default "7" if PPC32 && PPC_64K_PAGES
537    range 5 64 if PPC32 && PPC_256K_PAGES
538    default "5" if PPC32 && PPC_256K_PAGES
539    range 11 64
540    default "11"
541    help
542      The kernel memory allocator divides physically contiguous memory
543      blocks into "zones", where each zone is a power of two number of
544      pages. This option selects the largest power of two that the kernel
545      keeps in the memory allocator. If you need to allocate very large
546      blocks of physically contiguous memory, then you may need to
547      increase this value.
548
549      This config option is actually maximum order plus one. For example,
550      a value of 11 means that the largest free memory block is 2^10 pages.
551
552      The page size is not necessarily 4KB. For example, on 64-bit
553      systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
554      this in mind when choosing a value for this option.
555
556config PPC_SUBPAGE_PROT
557    bool "Support setting protections for 4k subpages"
558    depends on PPC_STD_MMU_64 && PPC_64K_PAGES
559    help
560      This option adds support for a system call to allow user programs
561      to set access permissions (read/write, readonly, or no access)
562      on the 4k subpages of each 64k page.
563
564config SCHED_SMT
565    bool "SMT (Hyperthreading) scheduler support"
566    depends on PPC64 && SMP
567    help
568      SMT scheduler support improves the CPU scheduler's decision making
569      when dealing with POWER5 cpus at a cost of slightly increased
570      overhead in some places. If unsure say N here.
571
572config CMDLINE_BOOL
573    bool "Default bootloader kernel arguments"
574
575config CMDLINE
576    string "Initial kernel command string"
577    depends on CMDLINE_BOOL
578    default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
579    help
580      On some platforms, there is currently no way for the boot loader to
581      pass arguments to the kernel. For these platforms, you can supply
582      some command-line options at build time by entering them here. In
583      most cases you will need to specify the root device here.
584
585config EXTRA_TARGETS
586    string "Additional default image types"
587    help
588      List additional targets to be built by the bootwrapper here (separated
589      by spaces). This is useful for targets that depend of device tree
590      files in the .dts directory.
591
592      Targets in this list will be build as part of the default build
593      target, or when the user does a 'make zImage' or a
594      'make zImage.initrd'.
595
596      If unsure, leave blank
597
598if !44x || BROKEN
599config ARCH_WANTS_FREEZER_CONTROL
600    def_bool y
601    depends on ADB_PMU
602
603source kernel/power/Kconfig
604endif
605
606config SECCOMP
607    bool "Enable seccomp to safely compute untrusted bytecode"
608    depends on PROC_FS
609    default y
610    help
611      This kernel feature is useful for number crunching applications
612      that may need to compute untrusted bytecode during their
613      execution. By using pipes or other transports made available to
614      the process as file descriptors supporting the read/write
615      syscalls, it's possible to isolate those applications in
616      their own address space using seccomp. Once seccomp is
617      enabled via /proc/<pid>/seccomp, it cannot be disabled
618      and the task is only allowed to execute a few safe syscalls
619      defined by each seccomp mode.
620
621      If unsure, say Y. Only embedded should say N here.
622
623endmenu
624
625config ISA_DMA_API
626    bool
627    default !PPC_ISERIES || PCI
628
629menu "Bus options"
630
631config ISA
632    bool "Support for ISA-bus hardware"
633    depends on PPC_PREP || PPC_CHRP
634    select PPC_I8259
635    help
636      Find out whether you have ISA slots on your motherboard. ISA is the
637      name of a bus system, i.e. the way the CPU talks to the other stuff
638      inside your box. If you have an Apple machine, say N here; if you
639      have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
640      you have an embedded board, consult your board documentation.
641
642config ZONE_DMA
643    bool
644    default y
645
646config NEED_DMA_MAP_STATE
647    def_bool (PPC64 || NOT_COHERENT_CACHE)
648
649config NEED_SG_DMA_LENGTH
650    def_bool y
651
652config GENERIC_ISA_DMA
653    bool
654    depends on ISA_DMA_API
655    default y
656
657config PPC_INDIRECT_PCI
658    bool
659    depends on PCI
660    default y if 40x || 44x
661    default n
662
663config EISA
664    bool
665
666config SBUS
667    bool
668
669config FSL_SOC
670    bool
671
672config FSL_PCI
673     bool
674    select PPC_INDIRECT_PCI
675    select PCI_QUIRKS
676
677config FSL_PMC
678    bool
679    default y
680    depends on SUSPEND && (PPC_85xx || PPC_86xx)
681    help
682      Freescale MPC85xx/MPC86xx power management controller support
683      (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
684
685config 4xx_SOC
686    bool
687
688config FSL_LBC
689    bool "Freescale Local Bus support"
690    depends on FSL_SOC
691    help
692      Enables reporting of errors from the Freescale local bus
693      controller. Also contains some common code used by
694      drivers for specific local bus peripherals.
695
696config FSL_GTM
697    bool
698    depends on PPC_83xx || QUICC_ENGINE || CPM2
699    help
700      Freescale General-purpose Timers support
701
702# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
703config MCA
704    bool
705
706# Platforms that what PCI turned unconditionally just do select PCI
707# in their config node. Platforms that want to choose at config
708# time should select PPC_PCI_CHOICE
709config PPC_PCI_CHOICE
710    bool
711
712config PCI
713    bool "PCI support" if PPC_PCI_CHOICE
714    default y if !40x && !CPM2 && !8xx && !PPC_83xx \
715        && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
716    default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
717    default PCI_QSPAN if !4xx && !CPM2 && 8xx
718    select ARCH_SUPPORTS_MSI
719    help
720      Find out whether your system includes a PCI bus. PCI is the name of
721      a bus system, i.e. the way the CPU talks to the other stuff inside
722      your box. If you say Y here, the kernel will include drivers and
723      infrastructure code to support PCI bus devices.
724
725config PCI_DOMAINS
726    def_bool PCI
727
728config PCI_SYSCALL
729    def_bool PCI
730
731config PCI_QSPAN
732    bool "QSpan PCI"
733    depends on !4xx && !CPM2 && 8xx
734    select PPC_I8259
735    help
736      Say Y here if you have a system based on a Motorola 8xx-series
737      embedded processor with a QSPAN PCI interface, otherwise say N.
738
739config PCI_8260
740    bool
741    depends on PCI && 8260
742    select PPC_INDIRECT_PCI
743    default y
744
745config 8260_PCI9
746    bool "Enable workaround for MPC826x erratum PCI 9"
747    depends on PCI_8260 && !8272
748    default y
749
750choice
751    prompt "IDMA channel for PCI 9 workaround"
752    depends on 8260_PCI9
753
754config 8260_PCI9_IDMA1
755    bool "IDMA1"
756
757config 8260_PCI9_IDMA2
758    bool "IDMA2"
759
760config 8260_PCI9_IDMA3
761    bool "IDMA3"
762
763config 8260_PCI9_IDMA4
764    bool "IDMA4"
765
766endchoice
767
768source "drivers/pci/pcie/Kconfig"
769
770source "drivers/pci/Kconfig"
771
772source "drivers/pcmcia/Kconfig"
773
774source "drivers/pci/hotplug/Kconfig"
775
776config HAS_RAPIDIO
777    bool
778    default n
779
780config RAPIDIO
781    bool "RapidIO support"
782    depends on HAS_RAPIDIO
783    help
784      If you say Y here, the kernel will include drivers and
785      infrastructure code to support RapidIO interconnect devices.
786
787source "drivers/rapidio/Kconfig"
788
789endmenu
790
791menu "Advanced setup"
792    depends on PPC32
793
794config ADVANCED_OPTIONS
795    bool "Prompt for advanced kernel configuration options"
796    help
797      This option will enable prompting for a variety of advanced kernel
798      configuration options. These options can cause the kernel to not
799      work if they are set incorrectly, but can be used to optimize certain
800      aspects of kernel memory management.
801
802      Unless you know what you are doing, say N here.
803
804comment "Default settings for advanced configuration options are used"
805    depends on !ADVANCED_OPTIONS
806
807config LOWMEM_SIZE_BOOL
808    bool "Set maximum low memory"
809    depends on ADVANCED_OPTIONS
810    help
811      This option allows you to set the maximum amount of memory which
812      will be used as "low memory", that is, memory which the kernel can
813      access directly, without having to set up a kernel virtual mapping.
814      This can be useful in optimizing the layout of kernel virtual
815      memory.
816
817      Say N here unless you know what you are doing.
818
819config LOWMEM_SIZE
820    hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
821    default "0x30000000"
822
823config LOWMEM_CAM_NUM_BOOL
824    bool "Set number of CAMs to use to map low memory"
825    depends on ADVANCED_OPTIONS && FSL_BOOKE
826    help
827      This option allows you to set the maximum number of CAM slots that
828      will be used to map low memory. There are a limited number of slots
829      available and even more limited number that will fit in the L1 MMU.
830      However, using more entries will allow mapping more low memory. This
831      can be useful in optimizing the layout of kernel virtual memory.
832
833      Say N here unless you know what you are doing.
834
835config LOWMEM_CAM_NUM
836    depends on FSL_BOOKE
837    int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
838    default 3
839
840config RELOCATABLE
841    bool "Build a relocatable kernel (EXPERIMENTAL)"
842    depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
843    help
844      This builds a kernel image that is capable of running at the
845      location the kernel is loaded at (some alignment restrictions may
846      exist).
847
848      One use is for the kexec on panic case where the recovery kernel
849      must live at a different physical address than the primary
850      kernel.
851
852      Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
853      it has been loaded at and the compile time physical addresses
854      CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
855      setting can still be useful to bootwrappers that need to know the
856      load location of the kernel (eg. u-boot/mkimage).
857
858config PAGE_OFFSET_BOOL
859    bool "Set custom page offset address"
860    depends on ADVANCED_OPTIONS
861    help
862      This option allows you to set the kernel virtual address at which
863      the kernel will map low memory. This can be useful in optimizing
864      the virtual memory layout of the system.
865
866      Say N here unless you know what you are doing.
867
868config PAGE_OFFSET
869    hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
870    default "0xc0000000"
871
872config KERNEL_START_BOOL
873    bool "Set custom kernel base address"
874    depends on ADVANCED_OPTIONS
875    help
876      This option allows you to set the kernel virtual address at which
877      the kernel will be loaded. Normally this should match PAGE_OFFSET
878      however there are times (like kdump) that one might not want them
879      to be the same.
880
881      Say N here unless you know what you are doing.
882
883config KERNEL_START
884    hex "Virtual address of kernel base" if KERNEL_START_BOOL
885    default PAGE_OFFSET if PAGE_OFFSET_BOOL
886    default "0xc2000000" if CRASH_DUMP && !RELOCATABLE
887    default "0xc0000000"
888
889config PHYSICAL_START_BOOL
890    bool "Set physical address where the kernel is loaded"
891    depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
892    help
893      This gives the physical address where the kernel is loaded.
894
895      Say N here unless you know what you are doing.
896
897config PHYSICAL_START
898    hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
899    default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !RELOCATABLE
900    default "0x00000000"
901
902config PHYSICAL_ALIGN
903    hex
904    default "0x04000000" if FSL_BOOKE
905    help
906      This value puts the alignment restrictions on physical address
907      where kernel is loaded and run from. Kernel is compiled for an
908      address which meets above alignment restriction.
909
910config TASK_SIZE_BOOL
911    bool "Set custom user task size"
912    depends on ADVANCED_OPTIONS
913    help
914      This option allows you to set the amount of virtual address space
915      allocated to user tasks. This can be useful in optimizing the
916      virtual memory layout of the system.
917
918      Say N here unless you know what you are doing.
919
920config TASK_SIZE
921    hex "Size of user task space" if TASK_SIZE_BOOL
922    default "0x80000000" if PPC_PREP || PPC_8xx
923    default "0xc0000000"
924
925config CONSISTENT_SIZE_BOOL
926    bool "Set custom consistent memory pool size"
927    depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
928    help
929      This option allows you to set the size of the
930      consistent memory pool. This pool of virtual memory
931      is used to make consistent memory allocations.
932
933config CONSISTENT_SIZE
934    hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
935    default "0x00200000" if NOT_COHERENT_CACHE
936
937config PIN_TLB
938    bool "Pinned Kernel TLBs (860 ONLY)"
939    depends on ADVANCED_OPTIONS && 8xx
940endmenu
941
942if PPC64
943config RELOCATABLE
944    bool "Build a relocatable kernel"
945    help
946      This builds a kernel image that is capable of running anywhere
947      in the RMA (real memory area) at any 16k-aligned base address.
948      The kernel is linked as a position-independent executable (PIE)
949      and contains dynamic relocations which are processed early
950      in the bootup process.
951
952      One use is for the kexec on panic case where the recovery kernel
953      must live at a different physical address than the primary
954      kernel.
955
956config PAGE_OFFSET
957    hex
958    default "0xc000000000000000"
959config KERNEL_START
960    hex
961    default "0xc000000000000000"
962config PHYSICAL_START
963    hex
964    default "0x00000000"
965endif
966
967source "net/Kconfig"
968
969source "drivers/Kconfig"
970
971source "fs/Kconfig"
972
973source "arch/powerpc/sysdev/qe_lib/Kconfig"
974
975source "lib/Kconfig"
976
977source "arch/powerpc/Kconfig.debug"
978
979source "security/Kconfig"
980
981config KEYS_COMPAT
982    bool
983    depends on COMPAT && KEYS
984    default y
985
986source "crypto/Kconfig"
987
988config PPC_CLOCK
989    bool
990    default n
991    select HAVE_CLK
992
993config PPC_LIB_RHEAP
994    bool
995
996source "arch/powerpc/kvm/Kconfig"
997

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