1 source "arch/powerpc/platforms/Kconfig.cputype"
15 config ARCH_PHYS_ADDR_T_64BIT
16 def_bool PPC64 || PHYS_64BIT
18 config ARCH_DMA_ADDR_T_64BIT
19 def_bool ARCH_PHYS_ADDR_T_64BIT
25 config ARCH_MMAP_RND_BITS_MAX
26 # On Book3S 64, the default virtual address space for 64-bit processes
27 # is 2^47 (128TB). As a maximum, allow randomisation to consume up to
28 # 32T of address space (2^45), which should ensure a reasonable gap
29 # between bottom-up and top-down allocations for applications that
30 # consume "normal" amounts of address space. Book3S 64 only supports 64K
32 default 29 if PPC_BOOK3S_64 && PPC_64K_PAGES # 29 = 45 (32T) - 16 (64K)
33 default 33 if PPC_BOOK3S_64 # 33 = 45 (32T) - 12 (4K)
35 # On all other 64-bit platforms (currently only Book3E), the virtual
36 # address space is 2^46 (64TB). Allow randomisation to consume up to 16T
37 # of address space (2^44). Only 4K page sizes are supported.
38 default 32 if 64BIT # 32 = 44 (16T) - 12 (4K)
40 # For 32-bit, use the compat values, as they're the same.
41 default ARCH_MMAP_RND_COMPAT_BITS_MAX
43 config ARCH_MMAP_RND_BITS_MIN
44 # Allow randomisation to consume up to 1GB of address space (2^30).
45 default 14 if 64BIT && PPC_64K_PAGES # 14 = 30 (1GB) - 16 (64K)
46 default 18 if 64BIT # 18 = 30 (1GB) - 12 (4K)
48 # For 32-bit, use the compat values, as they're the same.
49 default ARCH_MMAP_RND_COMPAT_BITS_MIN
51 config ARCH_MMAP_RND_COMPAT_BITS_MAX
52 # Total virtual address space for 32-bit processes is 2^31 (2GB).
53 # Allow randomisation to consume up to 512MB of address space (2^29).
54 default 11 if PPC_256K_PAGES # 11 = 29 (512MB) - 18 (256K)
55 default 13 if PPC_64K_PAGES # 13 = 29 (512MB) - 16 (64K)
56 default 15 if PPC_16K_PAGES # 15 = 29 (512MB) - 14 (16K)
57 default 17 # 17 = 29 (512MB) - 12 (4K)
59 config ARCH_MMAP_RND_COMPAT_BITS_MIN
60 # Total virtual address space for 32-bit processes is 2^31 (2GB).
61 # Allow randomisation to consume up to 8MB of address space (2^23).
62 default 5 if PPC_256K_PAGES # 5 = 23 (8MB) - 18 (256K)
63 default 7 if PPC_64K_PAGES # 7 = 23 (8MB) - 16 (64K)
64 default 9 if PPC_16K_PAGES # 9 = 23 (8MB) - 14 (16K)
65 default 11 # 11 = 23 (8MB) - 12 (4K)
67 config HAVE_SETUP_PER_CPU_AREA
70 config NEED_PER_CPU_EMBED_FIRST_CHUNK
74 int "Number of virtual interrupt numbers"
78 This defines the number of virtual interrupt numbers the kernel
79 can manage. Virtual interrupt numbers are what you see in
80 /proc/interrupts. If you configure your system to have too few,
81 drivers will fail to load or worse - handle with care.
85 depends on SMP && (DEBUGGER || KEXEC_CORE)
88 config STACKTRACE_SUPPORT
92 config TRACE_IRQFLAGS_SUPPORT
96 config LOCKDEP_SUPPORT
100 config RWSEM_GENERIC_SPINLOCK
103 config RWSEM_XCHGADD_ALGORITHM
107 config GENERIC_LOCKBREAK
110 depends on SMP && PREEMPT
112 config GENERIC_HWEIGHT
116 config ARCH_HAS_DMA_SET_COHERENT_MASK
123 # Please keep this list sorted alphabetically.
125 select ARCH_HAS_DEVMEM_IS_ALLOWED
126 select ARCH_HAS_DMA_SET_COHERENT_MASK
127 select ARCH_HAS_ELF_RANDOMIZE
128 select ARCH_HAS_GCOV_PROFILE_ALL
129 select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
130 select ARCH_HAS_SG_CHAIN
131 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
132 select ARCH_HAS_UBSAN_SANITIZE_ALL
133 select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
134 select ARCH_HAVE_NMI_SAFE_CMPXCHG
135 select ARCH_MIGHT_HAVE_PC_PARPORT
136 select ARCH_MIGHT_HAVE_PC_SERIO
137 select ARCH_SUPPORTS_ATOMIC_RMW
138 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
139 select ARCH_USE_BUILTIN_BSWAP
140 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
141 select ARCH_WANT_IPC_PARSE_VERSION
142 select ARCH_WEAK_RELEASE_ACQUIRE
144 select BUILDTIME_EXTABLE_SORT
145 select CLONE_BACKWARDS
146 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
147 select EDAC_ATOMIC_SCRUB
149 select GENERIC_ATOMIC64 if PPC32
150 select GENERIC_CLOCKEVENTS
151 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
152 select GENERIC_CMOS_UPDATE
153 select GENERIC_CPU_AUTOPROBE
154 select GENERIC_IRQ_SHOW
155 select GENERIC_IRQ_SHOW_LEVEL
156 select GENERIC_SMP_IDLE_THREAD
157 select GENERIC_STRNCPY_FROM_USER
158 select GENERIC_STRNLEN_USER
159 select GENERIC_TIME_VSYSCALL
160 select HAVE_ARCH_AUDITSYSCALL
161 select HAVE_ARCH_JUMP_LABEL
162 select HAVE_ARCH_KGDB
163 select HAVE_ARCH_MMAP_RND_BITS
164 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
165 select HAVE_ARCH_SECCOMP_FILTER
166 select HAVE_ARCH_TRACEHOOK
167 select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S_64 && !RELOCATABLE && !HIBERNATION)
168 select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
169 select HAVE_CBPF_JIT if !PPC64
170 select HAVE_CONTEXT_TRACKING if PPC64
171 select HAVE_DEBUG_KMEMLEAK
172 select HAVE_DEBUG_STACKOVERFLOW
173 select HAVE_DMA_API_DEBUG
174 select HAVE_DYNAMIC_FTRACE
175 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
176 select HAVE_EBPF_JIT if PPC64
177 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
178 select HAVE_FTRACE_MCOUNT_RECORD
179 select HAVE_FUNCTION_GRAPH_TRACER
180 select HAVE_FUNCTION_TRACER
181 select HAVE_GCC_PLUGINS
182 select HAVE_GENERIC_RCU_GUP
183 select HAVE_HW_BREAKPOINT if PERF_EVENTS && (PPC_BOOK3S || PPC_8xx)
185 select HAVE_IOREMAP_PROT
186 select HAVE_IRQ_EXIT_ON_IRQ_STACK
187 select HAVE_KERNEL_GZIP
189 select HAVE_KPROBES_ON_FTRACE
190 select HAVE_KRETPROBES
191 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
193 select HAVE_MEMBLOCK_NODE_MAP
194 select HAVE_MOD_ARCH_SPECIFIC
195 select HAVE_NMI if PERF_EVENTS
197 select HAVE_OPTPROBES if PPC64
198 select HAVE_PERF_EVENTS
199 select HAVE_PERF_EVENTS_NMI if PPC64
200 select HAVE_PERF_REGS
201 select HAVE_PERF_USER_STACK_DUMP
202 select HAVE_RCU_TABLE_FREE if SMP
203 select HAVE_REGS_AND_STACK_ACCESS_API
204 select HAVE_SYSCALL_TRACEPOINTS
205 select HAVE_VIRT_CPU_ACCOUNTING
206 select HAVE_IRQ_TIME_ACCOUNTING
208 select IRQ_FORCED_THREADING
209 select MODULES_USE_ELF_RELA
212 select OF_EARLY_FLATTREE
213 select OF_RESERVED_MEM
214 select OLD_SIGACTION if PPC32
215 select OLD_SIGSUSPEND
217 select SYSCTL_EXCEPTION_TRACE
218 select VIRT_TO_BUS if !PPC64
220 # Please keep this list sorted alphabetically.
237 select COMPAT_BINFMT_ELF
238 select ARCH_WANT_OLD_COMPAT_IPC
239 select COMPAT_OLD_SIGACTION
241 config SYSVIPC_COMPAT
243 depends on COMPAT && SYSVIPC
246 # All PPC32s use generic nvram driver through ppc_md
251 config SCHED_OMIT_FRAME_POINTER
255 config ARCH_MAY_HAVE_PC_FDC
259 config PPC_UDBG_16550
263 config GENERIC_TBSYNC
265 default y if PPC32 && SMP
277 config SYS_SUPPORTS_APM_EMULATION
278 default y if PMAC_APM_EMU
284 Used to allow a board to specify it wants an ePAPR compliant wrapper.
287 config DEFAULT_UIMAGE
290 Used to allow a board to specify it wants a uImage built by default
293 config ARCH_HIBERNATION_POSSIBLE
297 config ARCH_SUSPEND_POSSIBLE
299 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
300 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
303 config PPC_DCR_NATIVE
313 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
316 config PPC_OF_PLATFORM_PCI
319 depends on PPC64 # not supported on 32 bits yet
322 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
323 depends on PPC32 || PPC_STD_MMU_64
326 config ARCH_SUPPORTS_UPROBES
329 config PPC_ADV_DEBUG_REGS
331 depends on 40x || BOOKE
334 config PPC_ADV_DEBUG_IACS
336 depends on PPC_ADV_DEBUG_REGS
340 config PPC_ADV_DEBUG_DACS
342 depends on PPC_ADV_DEBUG_REGS
345 config PPC_ADV_DEBUG_DVCS
347 depends on PPC_ADV_DEBUG_REGS
351 config PPC_ADV_DEBUG_DAC_RANGE
353 depends on PPC_ADV_DEBUG_REGS && 44x
356 config PPC_EMULATE_SSTEP
358 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
364 config PGTABLE_LEVELS
367 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
370 source "init/Kconfig"
372 source "kernel/Kconfig.freezer"
374 source "arch/powerpc/sysdev/Kconfig"
375 source "arch/powerpc/platforms/Kconfig"
377 menu "Kernel options"
380 bool "High memory support"
383 source kernel/Kconfig.hz
384 source kernel/Kconfig.preempt
385 source "fs/Kconfig.binfmt"
387 config HUGETLB_PAGE_SIZE_VARIABLE
389 depends on HUGETLB_PAGE
392 config MATH_EMULATION
393 bool "Math emulation"
394 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
396 Some PowerPC chips designed for embedded applications do not have
397 a floating-point unit and therefore do not implement the
398 floating-point instructions in the PowerPC instruction set. If you
399 say Y here, the kernel will include code to emulate a floating-point
400 unit, which will allow programs that use floating-point
403 This is also useful to emulate missing (optional) instructions
404 such as fsqrt on cores that do have an FPU but do not implement
405 them (such as Freescale BookE).
408 prompt "Math emulation options"
409 default MATH_EMULATION_FULL
410 depends on MATH_EMULATION
412 config MATH_EMULATION_FULL
413 bool "Emulate all the floating point instructions"
415 Select this option will enable the kernel to support to emulate
416 all the floating point instructions. If your SoC doesn't have
417 a FPU, you should select this.
419 config MATH_EMULATION_HW_UNIMPLEMENTED
420 bool "Just emulate the FPU unimplemented instructions"
422 Select this if you know there does have a hardware FPU on your
423 SoC, but some floating point instructions are not implemented by that.
427 config PPC_TRANSACTIONAL_MEM
428 bool "Transactional Memory support for POWERPC"
429 depends on PPC_BOOK3S_64
435 Support user-mode Transactional Memory on POWERPC.
437 config LD_HEAD_STUB_CATCH
438 bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
442 Very large kernels can cause linker branch stubs to be generated by
443 code in head_64.S, which moves the head text sections out of their
444 specified location. This option can work around the problem.
448 config DISABLE_MPROFILE_KERNEL
449 bool "Disable use of mprofile-kernel for kernel tracing"
450 depends on PPC64 && CPU_LITTLE_ENDIAN
453 Selecting this options disables use of the mprofile-kernel ABI for
454 kernel tracing. That will cause options such as live patching
455 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
458 If you have a toolchain which supports mprofile-kernel, then you can
459 disable this. Otherwise leave it enabled. If you're not sure, say
462 config MPROFILE_KERNEL
463 depends on PPC64 && CPU_LITTLE_ENDIAN
464 def_bool !DISABLE_MPROFILE_KERNEL
466 config USE_THIN_ARCHIVES
467 bool "Build the kernel using thin archives"
471 Build the kernel using thin archives.
472 If you're unsure say N.
478 bool "SWIOTLB support"
482 Support for IO bounce buffering for systems without an IOMMU.
483 This allows us to DMA to the full physical address space on
484 platforms where the size of a physical address is larger
485 than the bus address. Not all platforms support this.
488 bool "Support for enabling/disabling CPUs"
489 depends on SMP && (PPC_PSERIES || \
490 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
492 Say Y here to be able to disable and re-enable individual
493 CPUs at runtime on SMP machines.
495 Say N if you are unsure.
497 config ARCH_CPU_PROBE_RELEASE
499 depends on HOTPLUG_CPU
501 config ARCH_ENABLE_MEMORY_HOTPLUG
504 config ARCH_HAS_WALK_MEMORY
507 config ARCH_ENABLE_MEMORY_HOTREMOVE
510 config PPC64_SUPPORTS_MEMORY_FAILURE
511 bool "Add support for memory hwpoison"
512 depends on PPC_BOOK3S_64
513 default "y" if PPC_POWERNV
514 select ARCH_SUPPORTS_MEMORY_FAILURE
517 bool "kexec system call"
518 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
521 kexec is a system call that implements the ability to shutdown your
522 current kernel, and to start another kernel. It is like a reboot
523 but it is independent of the system firmware. And like a reboot
524 you can start any kernel with it, not just Linux.
526 The name comes from the similarity to the exec system call.
528 It is an ongoing process to be certain the hardware in a machine
529 is properly shutdown, so do not be surprised if this code does not
530 initially work for you. As of this writing the exact hardware
531 interface is strongly in flux, so no good recommendation can be
535 bool "kexec file based system call"
537 select HAVE_IMA_KEXEC
541 depends on CRYPTO_SHA256=y
543 This is a new version of the kexec system call. This call is
544 file based and takes in file descriptors as system call arguments
545 for kernel and initramfs as opposed to a list of segments as is the
546 case for the older kexec call.
549 bool "Build a relocatable kernel"
550 depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
551 select NONSTATIC_KERNEL
552 select MODULE_REL_CRCS if MODVERSIONS
554 This builds a kernel image that is capable of running at the
555 location the kernel is loaded at. For ppc32, there is no any
556 alignment restrictions, and this feature is a superset of
557 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
558 16k-aligned base address. The kernel is linked as a
559 position-independent executable (PIE) and contains dynamic relocations
560 which are processed early in the bootup process.
562 One use is for the kexec on panic case where the recovery kernel
563 must live at a different physical address than the primary
566 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
567 it has been loaded at and the compile time physical addresses
568 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
569 setting can still be useful to bootwrappers that need to know the
570 load address of the kernel (eg. u-boot/mkimage).
572 config RELOCATABLE_TEST
573 bool "Test relocatable kernel"
574 depends on (PPC64 && RELOCATABLE)
577 This runs the relocatable kernel at the address it was initially
578 loaded at, which tends to be non-zero and therefore test the
582 bool "Build a dump capture kernel"
583 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
584 select RELOCATABLE if PPC64 || 44x || FSL_BOOKE
586 Build a kernel suitable for use as a dump capture kernel.
587 The same kernel binary can be used as production kernel and dump
591 bool "Firmware-assisted dump"
592 depends on PPC64 && PPC_RTAS
596 A robust mechanism to get reliable kernel crash dump with
597 assistance from firmware. This approach does not use kexec,
598 instead firmware assists in booting the capture kernel
599 while preserving memory contents. Firmware-assisted dump
600 is meant to be a kdump replacement offering robustness and
601 speed not possible without system firmware assistance.
606 bool "Distribute interrupts on all CPUs by default"
609 This option gives the kernel permission to distribute IRQs across
610 multiple CPUs. Saying N here will route all IRQs to the first
611 CPU. Generally saying Y is safe, although some problems have been
612 reported with SMP Power Macintoshes with this option enabled.
617 default y if SMP && PPC_PSERIES
623 depends on NEED_MULTIPLE_NODES
625 config USE_PERCPU_NUMA_NODE_ID
629 config HAVE_MEMORYLESS_NODES
633 config ARCH_SELECT_MEMORY_MODEL
637 config ARCH_FLATMEM_ENABLE
639 depends on (PPC64 && !NUMA) || PPC32
641 config ARCH_SPARSEMEM_ENABLE
644 select SPARSEMEM_VMEMMAP_ENABLE
646 config ARCH_SPARSEMEM_DEFAULT
648 depends on PPC_BOOK3S_64
650 config SYS_SUPPORTS_HUGETLBFS
653 config ILLEGAL_POINTER_VALUE
655 # This is roughly half way between the top of user space and the bottom
656 # of kernel space, which seems about as good as we can get.
657 default 0x5deadbeef0000000 if PPC64
662 config ARCH_MEMORY_PROBE
664 depends on MEMORY_HOTPLUG
666 # Some NUMA nodes have memory ranges that span
667 # other nodes. Even though a pfn is valid and
668 # between a node's start and end pfns, it may not
669 # reside on that node. See memmap_init_zone()
671 config NODES_SPAN_OTHER_NODES
673 depends on NEED_MULTIPLE_NODES
676 bool "Using standard binutils settings"
680 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
681 Note, that kernel will be able to run only those applications,
682 which had been compiled using binutils later than 2.17.50.0.3 with
683 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
684 the older binutils, you can patch them with a trivial patch, which
685 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
691 Select the kernel logical page size. Increasing the page size
692 will reduce software overhead at each page boundary, allow
693 hardware prefetch mechanisms to be more effective, and allow
694 larger dma transfers increasing IO efficiency and reducing
695 overhead. However the utilization of memory will increase.
696 For example, each cached file will using a multiple of the
697 page size to hold its contents and the difference between the
698 end of file and the end of page is wasted.
700 Some dedicated systems, such as software raid serving with
701 accelerated calculations, have shown significant increases.
703 If you configure a 64 bit kernel for 64k pages but the
704 processor does not support them, then the kernel will simulate
705 them with 4k pages, loading them on demand, but with the
706 reduced software overhead and larger internal fragmentation.
707 For the 32 bit kernel, a large page option will not be offered
708 unless it is supported by the configured processor.
710 If unsure, choose 4K_PAGES.
714 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
718 depends on 44x || PPC_8xx
722 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
723 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
725 config PPC_256K_PAGES
726 bool "256k page size"
727 depends on 44x && !STDBINUTILS
729 Make the page size 256k.
731 As the ELF standard only requires alignment to support page
732 sizes up to 64k, you will need to compile all of your user
733 space applications with a non-standard binutils settings
734 (see the STDBINUTILS description for details).
736 Say N unless you know what you are doing.
741 int "Thread shift" if EXPERT
743 default "15" if PPC_256K_PAGES
744 default "14" if PPC64
747 Used to define the stack size. The default is almost always what you
748 want. Only change this if you know what you are doing.
750 config FORCE_MAX_ZONEORDER
751 int "Maximum zone order"
752 range 8 9 if PPC64 && PPC_64K_PAGES
753 default "9" if PPC64 && PPC_64K_PAGES
754 range 13 13 if PPC64 && !PPC_64K_PAGES
755 default "13" if PPC64 && !PPC_64K_PAGES
756 range 9 64 if PPC32 && PPC_16K_PAGES
757 default "9" if PPC32 && PPC_16K_PAGES
758 range 7 64 if PPC32 && PPC_64K_PAGES
759 default "7" if PPC32 && PPC_64K_PAGES
760 range 5 64 if PPC32 && PPC_256K_PAGES
761 default "5" if PPC32 && PPC_256K_PAGES
765 The kernel memory allocator divides physically contiguous memory
766 blocks into "zones", where each zone is a power of two number of
767 pages. This option selects the largest power of two that the kernel
768 keeps in the memory allocator. If you need to allocate very large
769 blocks of physically contiguous memory, then you may need to
772 This config option is actually maximum order plus one. For example,
773 a value of 11 means that the largest free memory block is 2^10 pages.
775 The page size is not necessarily 4KB. For example, on 64-bit
776 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
777 this in mind when choosing a value for this option.
779 config PPC_SUBPAGE_PROT
780 bool "Support setting protections for 4k subpages"
781 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
783 This option adds support for a system call to allow user programs
784 to set access permissions (read/write, readonly, or no access)
785 on the 4k subpages of each 64k page.
787 config PPC_COPRO_BASE
792 bool "SMT (Hyperthreading) scheduler support"
793 depends on PPC64 && SMP
795 SMT scheduler support improves the CPU scheduler's decision making
796 when dealing with POWER5 cpus at a cost of slightly increased
797 overhead in some places. If unsure say N here.
799 config PPC_DENORMALISATION
800 bool "PowerPC denormalisation exception handling"
801 depends on PPC_BOOK3S_64
802 default "y" if PPC_POWERNV
804 Add support for handling denormalisation of single precision
805 values. Useful for bare metal only. If unsure say Y here.
808 bool "Default bootloader kernel arguments"
811 string "Initial kernel command string"
812 depends on CMDLINE_BOOL
813 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
815 On some platforms, there is currently no way for the boot loader to
816 pass arguments to the kernel. For these platforms, you can supply
817 some command-line options at build time by entering them here. In
818 most cases you will need to specify the root device here.
821 bool "Always use the default kernel command string"
822 depends on CMDLINE_BOOL
824 Always use the default kernel command string, even if the boot
825 loader passes other arguments to the kernel.
826 This is useful if you cannot or don't want to change the
827 command-line options your boot loader passes to the kernel.
830 string "Additional default image types"
832 List additional targets to be built by the bootwrapper here (separated
833 by spaces). This is useful for targets that depend of device tree
834 files in the .dts directory.
836 Targets in this list will be build as part of the default build
837 target, or when the user does a 'make zImage' or a
838 'make zImage.initrd'.
840 If unsure, leave blank
842 config ARCH_WANTS_FREEZER_CONTROL
846 source kernel/power/Kconfig
849 bool "Enable seccomp to safely compute untrusted bytecode"
853 This kernel feature is useful for number crunching applications
854 that may need to compute untrusted bytecode during their
855 execution. By using pipes or other transports made available to
856 the process as file descriptors supporting the read/write
857 syscalls, it's possible to isolate those applications in
858 their own address space using seccomp. Once seccomp is
859 enabled via /proc/<pid>/seccomp, it cannot be disabled
860 and the task is only allowed to execute a few safe syscalls
861 defined by each seccomp mode.
863 If unsure, say Y. Only embedded should say N here.
874 bool "Support for ISA-bus hardware"
878 Find out whether you have ISA slots on your motherboard. ISA is the
879 name of a bus system, i.e. the way the CPU talks to the other stuff
880 inside your box. If you have an Apple machine, say N here; if you
881 have an IBM RS/6000 or pSeries machine, say Y. If you have an
882 embedded board, consult your board documentation.
888 config NEED_DMA_MAP_STATE
889 def_bool (PPC64 || NOT_COHERENT_CACHE)
891 config NEED_SG_DMA_LENGTH
894 config GENERIC_ISA_DMA
896 depends on ISA_DMA_API
899 config PPC_INDIRECT_PCI
902 default y if 40x || 44x
916 select PPC_INDIRECT_PCI
922 depends on SUSPEND && (PPC_85xx || PPC_86xx)
924 Freescale MPC85xx/MPC86xx power management controller support
925 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
930 depends on SUSPEND && (44x || 40x)
932 PPC4xx Clock Power Management (CPM) support (suspend/resume).
933 It also enables support for two different idle states (idle-wait
940 bool "Freescale Local Bus support"
942 Enables reporting of errors from the Freescale local bus
943 controller. Also contains some common code used by
944 drivers for specific local bus peripherals.
948 depends on PPC_83xx || QUICC_ENGINE || CPM2
950 Freescale General-purpose Timers support
952 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
956 # Platforms that what PCI turned unconditionally just do select PCI
957 # in their config node. Platforms that want to choose at config
958 # time should select PPC_PCI_CHOICE
959 config PPC_PCI_CHOICE
963 bool "PCI support" if PPC_PCI_CHOICE
964 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
965 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
966 default PCI_QSPAN if !4xx && !CPM2 && 8xx
967 select GENERIC_PCI_IOMAP
969 Find out whether your system includes a PCI bus. PCI is the name of
970 a bus system, i.e. the way the CPU talks to the other stuff inside
971 your box. If you say Y here, the kernel will include drivers and
972 infrastructure code to support PCI bus devices.
982 depends on !4xx && !CPM2 && 8xx
985 Say Y here if you have a system based on a Motorola 8xx-series
986 embedded processor with a QSPAN PCI interface, otherwise say N.
990 depends on PCI && 8260
991 select PPC_INDIRECT_PCI
994 source "drivers/pci/Kconfig"
996 source "drivers/pcmcia/Kconfig"
1003 tristate "RapidIO support"
1004 depends on HAS_RAPIDIO || PCI
1006 If you say Y here, the kernel will include drivers and
1007 infrastructure code to support RapidIO interconnect devices.
1010 bool "Freescale Embedded SRIO Controller support"
1011 depends on RAPIDIO = y && HAS_RAPIDIO
1014 Include support for RapidIO controller on Freescale embedded
1015 processors (MPC8548, MPC8641, etc).
1017 source "drivers/rapidio/Kconfig"
1021 config NONSTATIC_KERNEL
1025 menu "Advanced setup"
1028 config ADVANCED_OPTIONS
1029 bool "Prompt for advanced kernel configuration options"
1031 This option will enable prompting for a variety of advanced kernel
1032 configuration options. These options can cause the kernel to not
1033 work if they are set incorrectly, but can be used to optimize certain
1034 aspects of kernel memory management.
1036 Unless you know what you are doing, say N here.
1038 comment "Default settings for advanced configuration options are used"
1039 depends on !ADVANCED_OPTIONS
1041 config LOWMEM_SIZE_BOOL
1042 bool "Set maximum low memory"
1043 depends on ADVANCED_OPTIONS
1045 This option allows you to set the maximum amount of memory which
1046 will be used as "low memory", that is, memory which the kernel can
1047 access directly, without having to set up a kernel virtual mapping.
1048 This can be useful in optimizing the layout of kernel virtual
1051 Say N here unless you know what you are doing.
1054 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
1055 default "0x30000000"
1057 config LOWMEM_CAM_NUM_BOOL
1058 bool "Set number of CAMs to use to map low memory"
1059 depends on ADVANCED_OPTIONS && FSL_BOOKE
1061 This option allows you to set the maximum number of CAM slots that
1062 will be used to map low memory. There are a limited number of slots
1063 available and even more limited number that will fit in the L1 MMU.
1064 However, using more entries will allow mapping more low memory. This
1065 can be useful in optimizing the layout of kernel virtual memory.
1067 Say N here unless you know what you are doing.
1069 config LOWMEM_CAM_NUM
1070 depends on FSL_BOOKE
1071 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
1074 config DYNAMIC_MEMSTART
1075 bool "Enable page aligned dynamic load address for kernel"
1076 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
1077 select NONSTATIC_KERNEL
1079 This option enables the kernel to be loaded at any page aligned
1080 physical address. The kernel creates a mapping from KERNELBASE to
1081 the address where the kernel is loaded. The page size here implies
1082 the TLB page size of the mapping for kernel on the particular platform.
1083 Please refer to the init code for finding the TLB page size.
1085 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
1086 kernel image, where the only restriction is the page aligned kernel
1087 load address. When this option is enabled, the compile time physical
1088 address CONFIG_PHYSICAL_START is ignored.
1090 This option is overridden by CONFIG_RELOCATABLE
1092 config PAGE_OFFSET_BOOL
1093 bool "Set custom page offset address"
1094 depends on ADVANCED_OPTIONS
1096 This option allows you to set the kernel virtual address at which
1097 the kernel will map low memory. This can be useful in optimizing
1098 the virtual memory layout of the system.
1100 Say N here unless you know what you are doing.
1103 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
1104 default "0xc0000000"
1106 config KERNEL_START_BOOL
1107 bool "Set custom kernel base address"
1108 depends on ADVANCED_OPTIONS
1110 This option allows you to set the kernel virtual address at which
1111 the kernel will be loaded. Normally this should match PAGE_OFFSET
1112 however there are times (like kdump) that one might not want them
1115 Say N here unless you know what you are doing.
1118 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1119 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1120 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1121 default "0xc0000000"
1123 config PHYSICAL_START_BOOL
1124 bool "Set physical address where the kernel is loaded"
1125 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1127 This gives the physical address where the kernel is loaded.
1129 Say N here unless you know what you are doing.
1131 config PHYSICAL_START
1132 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1133 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1134 default "0x00000000"
1136 config PHYSICAL_ALIGN
1138 default "0x04000000" if FSL_BOOKE
1140 This value puts the alignment restrictions on physical address
1141 where kernel is loaded and run from. Kernel is compiled for an
1142 address which meets above alignment restriction.
1144 config TASK_SIZE_BOOL
1145 bool "Set custom user task size"
1146 depends on ADVANCED_OPTIONS
1148 This option allows you to set the amount of virtual address space
1149 allocated to user tasks. This can be useful in optimizing the
1150 virtual memory layout of the system.
1152 Say N here unless you know what you are doing.
1155 hex "Size of user task space" if TASK_SIZE_BOOL
1156 default "0x80000000" if PPC_8xx
1157 default "0xc0000000"
1159 config CONSISTENT_SIZE_BOOL
1160 bool "Set custom consistent memory pool size"
1161 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1163 This option allows you to set the size of the
1164 consistent memory pool. This pool of virtual memory
1165 is used to make consistent memory allocations.
1167 config CONSISTENT_SIZE
1168 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1169 default "0x00200000" if NOT_COHERENT_CACHE
1172 bool "Pinned Kernel TLBs (860 ONLY)"
1173 depends on ADVANCED_OPTIONS && 8xx
1176 bool "Pinned TLB for IMMR"
1182 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1185 default "0xc000000000000000"
1188 default "0xc000000000000000"
1189 config PHYSICAL_START
1191 default "0x00000000"
1197 source "net/Kconfig"
1199 source "drivers/Kconfig"
1203 source "lib/Kconfig"
1205 source "arch/powerpc/Kconfig.debug"
1207 source "security/Kconfig"
1211 depends on COMPAT && KEYS
1214 source "crypto/Kconfig"
1216 config PPC_LIB_RHEAP
1219 source "arch/powerpc/kvm/Kconfig"
1221 source "kernel/livepatch/Kconfig"