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 HAVE_SETUP_PER_CPU_AREA
28 config NEED_PER_CPU_EMBED_FIRST_CHUNK
32 int "Number of virtual interrupt numbers"
36 This defines the number of virtual interrupt numbers the kernel
37 can manage. Virtual interrupt numbers are what you see in
38 /proc/interrupts. If you configure your system to have too few,
39 drivers will fail to load or worse - handle with care.
41 config STACKTRACE_SUPPORT
45 config TRACE_IRQFLAGS_SUPPORT
49 config LOCKDEP_SUPPORT
53 config RWSEM_GENERIC_SPINLOCK
56 config RWSEM_XCHGADD_ALGORITHM
60 config GENERIC_LOCKBREAK
63 depends on SMP && PREEMPT
65 config ARCH_HAS_ILOG2_U32
69 config ARCH_HAS_ILOG2_U64
73 config GENERIC_HWEIGHT
77 config ARCH_HAS_DMA_SET_COHERENT_MASK
83 select ARCH_MIGHT_HAVE_PC_PARPORT
84 select ARCH_MIGHT_HAVE_PC_SERIO
86 select ARCH_HAS_ELF_RANDOMIZE
88 select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
89 select OF_EARLY_FLATTREE
90 select OF_RESERVED_MEM
91 select HAVE_FTRACE_MCOUNT_RECORD
92 select HAVE_DYNAMIC_FTRACE
93 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
94 select HAVE_FUNCTION_TRACER
95 select HAVE_FUNCTION_GRAPH_TRACER
96 select SYSCTL_EXCEPTION_TRACE
97 select VIRT_TO_BUS if !PPC64
99 select HAVE_IOREMAP_PROT
100 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
102 select HAVE_ARCH_KGDB
103 select HAVE_KRETPROBES
104 select HAVE_ARCH_TRACEHOOK
106 select HAVE_MEMBLOCK_NODE_MAP
107 select HAVE_DMA_API_DEBUG
109 select HAVE_DEBUG_KMEMLEAK
110 select ARCH_HAS_SG_CHAIN
111 select GENERIC_ATOMIC64 if PPC32
112 select HAVE_PERF_EVENTS
113 select HAVE_PERF_REGS
114 select HAVE_PERF_USER_STACK_DUMP
115 select HAVE_REGS_AND_STACK_ACCESS_API
116 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
117 select ARCH_WANT_IPC_PARSE_VERSION
120 select GENERIC_IRQ_SHOW
121 select GENERIC_IRQ_SHOW_LEVEL
122 select IRQ_FORCED_THREADING
123 select HAVE_RCU_TABLE_FREE if SMP
124 select HAVE_SYSCALL_TRACEPOINTS
125 select HAVE_CBPF_JIT if !PPC64
126 select HAVE_EBPF_JIT if PPC64
127 select HAVE_ARCH_JUMP_LABEL
128 select ARCH_HAVE_NMI_SAFE_CMPXCHG
129 select ARCH_HAS_GCOV_PROFILE_ALL
130 select GENERIC_SMP_IDLE_THREAD
131 select GENERIC_CMOS_UPDATE
132 select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
133 select GENERIC_TIME_VSYSCALL_OLD
134 select GENERIC_CLOCKEVENTS
135 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
136 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
137 select GENERIC_STRNCPY_FROM_USER
138 select GENERIC_STRNLEN_USER
139 select HAVE_MOD_ARCH_SPECIFIC
140 select MODULES_USE_ELF_RELA
141 select CLONE_BACKWARDS
142 select ARCH_USE_BUILTIN_BSWAP
143 select OLD_SIGSUSPEND
144 select OLD_SIGACTION if PPC32
145 select HAVE_DEBUG_STACKOVERFLOW
146 select HAVE_IRQ_EXIT_ON_IRQ_STACK
147 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
148 select HAVE_ARCH_AUDITSYSCALL
149 select ARCH_SUPPORTS_ATOMIC_RMW
150 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
152 select HAVE_GENERIC_RCU_GUP
153 select HAVE_PERF_EVENTS_NMI if PPC64
154 select HAVE_NMI if PERF_EVENTS
156 select EDAC_ATOMIC_SCRUB
157 select ARCH_HAS_DMA_SET_COHERENT_MASK
158 select ARCH_HAS_DEVMEM_IS_ALLOWED
159 select HAVE_ARCH_SECCOMP_FILTER
160 select ARCH_HAS_UBSAN_SANITIZE_ALL
161 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
162 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
163 select GENERIC_CPU_AUTOPROBE
164 select HAVE_VIRT_CPU_ACCOUNTING
165 select HAVE_ARCH_HARDENED_USERCOPY
166 select HAVE_KERNEL_GZIP
168 config PPC_BARRIER_NOSPEC
171 depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E
174 def_bool CPU_LITTLE_ENDIAN
187 select COMPAT_BINFMT_ELF
188 select ARCH_WANT_OLD_COMPAT_IPC
189 select COMPAT_OLD_SIGACTION
191 config SYSVIPC_COMPAT
193 depends on COMPAT && SYSVIPC
196 # All PPC32s use generic nvram driver through ppc_md
201 config SCHED_OMIT_FRAME_POINTER
205 config ARCH_MAY_HAVE_PC_FDC
209 config PPC_UDBG_16550
213 config GENERIC_TBSYNC
215 default y if PPC32 && SMP
227 config SYS_SUPPORTS_APM_EMULATION
228 default y if PMAC_APM_EMU
234 Used to allow a board to specify it wants an ePAPR compliant wrapper.
237 config DEFAULT_UIMAGE
240 Used to allow a board to specify it wants a uImage built by default
243 config ARCH_HIBERNATION_POSSIBLE
247 config ARCH_SUSPEND_POSSIBLE
249 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
250 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
253 config PPC_DCR_NATIVE
263 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
266 config PPC_OF_PLATFORM_PCI
269 depends on PPC64 # not supported on 32 bits yet
272 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
273 depends on PPC32 || PPC_STD_MMU_64
276 config ARCH_SUPPORTS_UPROBES
279 config PPC_ADV_DEBUG_REGS
281 depends on 40x || BOOKE
284 config PPC_ADV_DEBUG_IACS
286 depends on PPC_ADV_DEBUG_REGS
290 config PPC_ADV_DEBUG_DACS
292 depends on PPC_ADV_DEBUG_REGS
295 config PPC_ADV_DEBUG_DVCS
297 depends on PPC_ADV_DEBUG_REGS
301 config PPC_ADV_DEBUG_DAC_RANGE
303 depends on PPC_ADV_DEBUG_REGS && 44x
306 config PPC_EMULATE_SSTEP
308 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
314 config PGTABLE_LEVELS
317 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
320 source "init/Kconfig"
322 source "kernel/Kconfig.freezer"
324 source "arch/powerpc/sysdev/Kconfig"
325 source "arch/powerpc/platforms/Kconfig"
327 menu "Kernel options"
330 bool "High memory support"
333 source kernel/Kconfig.hz
334 source kernel/Kconfig.preempt
335 source "fs/Kconfig.binfmt"
337 config HUGETLB_PAGE_SIZE_VARIABLE
339 depends on HUGETLB_PAGE
342 config MATH_EMULATION
343 bool "Math emulation"
344 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
346 Some PowerPC chips designed for embedded applications do not have
347 a floating-point unit and therefore do not implement the
348 floating-point instructions in the PowerPC instruction set. If you
349 say Y here, the kernel will include code to emulate a floating-point
350 unit, which will allow programs that use floating-point
353 This is also useful to emulate missing (optional) instructions
354 such as fsqrt on cores that do have an FPU but do not implement
355 them (such as Freescale BookE).
358 prompt "Math emulation options"
359 default MATH_EMULATION_FULL
360 depends on MATH_EMULATION
362 config MATH_EMULATION_FULL
363 bool "Emulate all the floating point instructions"
365 Select this option will enable the kernel to support to emulate
366 all the floating point instructions. If your SoC doesn't have
367 a FPU, you should select this.
369 config MATH_EMULATION_HW_UNIMPLEMENTED
370 bool "Just emulate the FPU unimplemented instructions"
372 Select this if you know there does have a hardware FPU on your
373 SoC, but some floating point instructions are not implemented by that.
377 config PPC_TRANSACTIONAL_MEM
378 bool "Transactional Memory support for POWERPC"
379 depends on PPC_BOOK3S_64
385 Support user-mode Transactional Memory on POWERPC.
387 config DISABLE_MPROFILE_KERNEL
388 bool "Disable use of mprofile-kernel for kernel tracing"
389 depends on PPC64 && CPU_LITTLE_ENDIAN
392 Selecting this options disables use of the mprofile-kernel ABI for
393 kernel tracing. That will cause options such as live patching
394 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
397 If you have a toolchain which supports mprofile-kernel, then you can
398 disable this. Otherwise leave it enabled. If you're not sure, say
401 config MPROFILE_KERNEL
402 depends on PPC64 && CPU_LITTLE_ENDIAN
403 def_bool !DISABLE_MPROFILE_KERNEL
409 bool "SWIOTLB support"
413 Support for IO bounce buffering for systems without an IOMMU.
414 This allows us to DMA to the full physical address space on
415 platforms where the size of a physical address is larger
416 than the bus address. Not all platforms support this.
419 bool "Support for enabling/disabling CPUs"
420 depends on SMP && (PPC_PSERIES || \
421 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
423 Say Y here to be able to disable and re-enable individual
424 CPUs at runtime on SMP machines.
426 Say N if you are unsure.
428 config ARCH_CPU_PROBE_RELEASE
430 depends on HOTPLUG_CPU
432 config ARCH_ENABLE_MEMORY_HOTPLUG
435 config ARCH_HAS_WALK_MEMORY
438 config ARCH_ENABLE_MEMORY_HOTREMOVE
441 config PPC64_SUPPORTS_MEMORY_FAILURE
442 bool "Add support for memory hwpoison"
443 depends on PPC_BOOK3S_64
444 default "y" if PPC_POWERNV
445 select ARCH_SUPPORTS_MEMORY_FAILURE
448 bool "kexec system call"
449 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
452 kexec is a system call that implements the ability to shutdown your
453 current kernel, and to start another kernel. It is like a reboot
454 but it is independent of the system firmware. And like a reboot
455 you can start any kernel with it, not just Linux.
457 The name comes from the similarity to the exec system call.
459 It is an ongoing process to be certain the hardware in a machine
460 is properly shutdown, so do not be surprised if this code does not
461 initially work for you. As of this writing the exact hardware
462 interface is strongly in flux, so no good recommendation can be
466 bool "Build a relocatable kernel"
467 depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
468 select NONSTATIC_KERNEL
470 This builds a kernel image that is capable of running at the
471 location the kernel is loaded at. For ppc32, there is no any
472 alignment restrictions, and this feature is a superset of
473 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
474 16k-aligned base address. The kernel is linked as a
475 position-independent executable (PIE) and contains dynamic relocations
476 which are processed early in the bootup process.
478 One use is for the kexec on panic case where the recovery kernel
479 must live at a different physical address than the primary
482 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
483 it has been loaded at and the compile time physical addresses
484 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
485 setting can still be useful to bootwrappers that need to know the
486 load address of the kernel (eg. u-boot/mkimage).
489 bool "Build a kdump crash kernel"
490 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
491 select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
493 Build a kernel suitable for use as a kdump capture kernel.
494 The same kernel binary can be used as production kernel and dump
498 bool "Firmware-assisted dump"
499 depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
501 A robust mechanism to get reliable kernel crash dump with
502 assistance from firmware. This approach does not use kexec,
503 instead firmware assists in booting the kdump kernel
504 while preserving memory contents. Firmware-assisted dump
505 is meant to be a kdump replacement offering robustness and
506 speed not possible without system firmware assistance.
511 bool "Distribute interrupts on all CPUs by default"
514 This option gives the kernel permission to distribute IRQs across
515 multiple CPUs. Saying N here will route all IRQs to the first
516 CPU. Generally saying Y is safe, although some problems have been
517 reported with SMP Power Macintoshes with this option enabled.
522 default y if SMP && PPC_PSERIES
528 depends on NEED_MULTIPLE_NODES
530 config USE_PERCPU_NUMA_NODE_ID
534 config HAVE_MEMORYLESS_NODES
538 config ARCH_SELECT_MEMORY_MODEL
542 config ARCH_FLATMEM_ENABLE
544 depends on (PPC64 && !NUMA) || PPC32
546 config ARCH_SPARSEMEM_ENABLE
549 select SPARSEMEM_VMEMMAP_ENABLE
551 config ARCH_SPARSEMEM_DEFAULT
553 depends on (SMP && PPC_PSERIES) || PPC_PS3
555 config SYS_SUPPORTS_HUGETLBFS
560 config ARCH_MEMORY_PROBE
562 depends on MEMORY_HOTPLUG
564 # Some NUMA nodes have memory ranges that span
565 # other nodes. Even though a pfn is valid and
566 # between a node's start and end pfns, it may not
567 # reside on that node. See memmap_init_zone()
569 config NODES_SPAN_OTHER_NODES
571 depends on NEED_MULTIPLE_NODES
574 bool "Using standard binutils settings"
578 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
579 Note, that kernel will be able to run only those applications,
580 which had been compiled using binutils later than 2.17.50.0.3 with
581 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
582 the older binutils, you can patch them with a trivial patch, which
583 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
589 Select the kernel logical page size. Increasing the page size
590 will reduce software overhead at each page boundary, allow
591 hardware prefetch mechanisms to be more effective, and allow
592 larger dma transfers increasing IO efficiency and reducing
593 overhead. However the utilization of memory will increase.
594 For example, each cached file will using a multiple of the
595 page size to hold its contents and the difference between the
596 end of file and the end of page is wasted.
598 Some dedicated systems, such as software raid serving with
599 accelerated calculations, have shown significant increases.
601 If you configure a 64 bit kernel for 64k pages but the
602 processor does not support them, then the kernel will simulate
603 them with 4k pages, loading them on demand, but with the
604 reduced software overhead and larger internal fragmentation.
605 For the 32 bit kernel, a large page option will not be offered
606 unless it is supported by the configured processor.
608 If unsure, choose 4K_PAGES.
612 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
616 depends on 44x || PPC_8xx
620 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
621 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
623 config PPC_256K_PAGES
624 bool "256k page size"
625 depends on 44x && !STDBINUTILS && !PPC_47x
627 Make the page size 256k.
629 As the ELF standard only requires alignment to support page
630 sizes up to 64k, you will need to compile all of your user
631 space applications with a non-standard binutils settings
632 (see the STDBINUTILS description for details).
634 Say N unless you know what you are doing.
638 config FORCE_MAX_ZONEORDER
639 int "Maximum zone order"
640 range 8 9 if PPC64 && PPC_64K_PAGES
641 default "9" if PPC64 && PPC_64K_PAGES
642 range 13 13 if PPC64 && !PPC_64K_PAGES
643 default "13" if PPC64 && !PPC_64K_PAGES
644 range 9 64 if PPC32 && PPC_16K_PAGES
645 default "9" if PPC32 && PPC_16K_PAGES
646 range 7 64 if PPC32 && PPC_64K_PAGES
647 default "7" if PPC32 && PPC_64K_PAGES
648 range 5 64 if PPC32 && PPC_256K_PAGES
649 default "5" if PPC32 && PPC_256K_PAGES
653 The kernel memory allocator divides physically contiguous memory
654 blocks into "zones", where each zone is a power of two number of
655 pages. This option selects the largest power of two that the kernel
656 keeps in the memory allocator. If you need to allocate very large
657 blocks of physically contiguous memory, then you may need to
660 This config option is actually maximum order plus one. For example,
661 a value of 11 means that the largest free memory block is 2^10 pages.
663 The page size is not necessarily 4KB. For example, on 64-bit
664 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
665 this in mind when choosing a value for this option.
667 config PPC_SUBPAGE_PROT
668 bool "Support setting protections for 4k subpages"
669 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
671 This option adds support for a system call to allow user programs
672 to set access permissions (read/write, readonly, or no access)
673 on the 4k subpages of each 64k page.
675 config PPC_COPRO_BASE
680 bool "SMT (Hyperthreading) scheduler support"
681 depends on PPC64 && SMP
683 SMT scheduler support improves the CPU scheduler's decision making
684 when dealing with POWER5 cpus at a cost of slightly increased
685 overhead in some places. If unsure say N here.
687 config PPC_DENORMALISATION
688 bool "PowerPC denormalisation exception handling"
689 depends on PPC_BOOK3S_64
690 default "y" if PPC_POWERNV
692 Add support for handling denormalisation of single precision
693 values. Useful for bare metal only. If unsure say Y here.
696 bool "Default bootloader kernel arguments"
699 string "Initial kernel command string"
700 depends on CMDLINE_BOOL
701 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
703 On some platforms, there is currently no way for the boot loader to
704 pass arguments to the kernel. For these platforms, you can supply
705 some command-line options at build time by entering them here. In
706 most cases you will need to specify the root device here.
709 bool "Always use the default kernel command string"
710 depends on CMDLINE_BOOL
712 Always use the default kernel command string, even if the boot
713 loader passes other arguments to the kernel.
714 This is useful if you cannot or don't want to change the
715 command-line options your boot loader passes to the kernel.
718 string "Additional default image types"
720 List additional targets to be built by the bootwrapper here (separated
721 by spaces). This is useful for targets that depend of device tree
722 files in the .dts directory.
724 Targets in this list will be build as part of the default build
725 target, or when the user does a 'make zImage' or a
726 'make zImage.initrd'.
728 If unsure, leave blank
730 config ARCH_WANTS_FREEZER_CONTROL
734 source kernel/power/Kconfig
737 bool "Enable seccomp to safely compute untrusted bytecode"
741 This kernel feature is useful for number crunching applications
742 that may need to compute untrusted bytecode during their
743 execution. By using pipes or other transports made available to
744 the process as file descriptors supporting the read/write
745 syscalls, it's possible to isolate those applications in
746 their own address space using seccomp. Once seccomp is
747 enabled via /proc/<pid>/seccomp, it cannot be disabled
748 and the task is only allowed to execute a few safe syscalls
749 defined by each seccomp mode.
751 If unsure, say Y. Only embedded should say N here.
762 bool "Support for ISA-bus hardware"
766 Find out whether you have ISA slots on your motherboard. ISA is the
767 name of a bus system, i.e. the way the CPU talks to the other stuff
768 inside your box. If you have an Apple machine, say N here; if you
769 have an IBM RS/6000 or pSeries machine, say Y. If you have an
770 embedded board, consult your board documentation.
776 config NEED_DMA_MAP_STATE
777 def_bool (PPC64 || NOT_COHERENT_CACHE)
779 config NEED_SG_DMA_LENGTH
782 config GENERIC_ISA_DMA
784 depends on ISA_DMA_API
787 config PPC_INDIRECT_PCI
790 default y if 40x || 44x
804 select PPC_INDIRECT_PCI
810 depends on SUSPEND && (PPC_85xx || PPC_86xx)
812 Freescale MPC85xx/MPC86xx power management controller support
813 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
818 depends on SUSPEND && (44x || 40x)
820 PPC4xx Clock Power Management (CPM) support (suspend/resume).
821 It also enables support for two different idle states (idle-wait
828 bool "Freescale Local Bus support"
830 Enables reporting of errors from the Freescale local bus
831 controller. Also contains some common code used by
832 drivers for specific local bus peripherals.
836 depends on PPC_83xx || QUICC_ENGINE || CPM2
838 Freescale General-purpose Timers support
840 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
844 # Platforms that what PCI turned unconditionally just do select PCI
845 # in their config node. Platforms that want to choose at config
846 # time should select PPC_PCI_CHOICE
847 config PPC_PCI_CHOICE
851 bool "PCI support" if PPC_PCI_CHOICE
852 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
853 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
854 default PCI_QSPAN if !4xx && !CPM2 && 8xx
855 select GENERIC_PCI_IOMAP
857 Find out whether your system includes a PCI bus. PCI is the name of
858 a bus system, i.e. the way the CPU talks to the other stuff inside
859 your box. If you say Y here, the kernel will include drivers and
860 infrastructure code to support PCI bus devices.
870 depends on !4xx && !CPM2 && 8xx
873 Say Y here if you have a system based on a Motorola 8xx-series
874 embedded processor with a QSPAN PCI interface, otherwise say N.
878 depends on PCI && 8260
879 select PPC_INDIRECT_PCI
882 source "drivers/pci/Kconfig"
884 source "drivers/pcmcia/Kconfig"
891 tristate "RapidIO support"
892 depends on HAS_RAPIDIO || PCI
894 If you say Y here, the kernel will include drivers and
895 infrastructure code to support RapidIO interconnect devices.
898 bool "Freescale Embedded SRIO Controller support"
899 depends on RAPIDIO = y && HAS_RAPIDIO
902 Include support for RapidIO controller on Freescale embedded
903 processors (MPC8548, MPC8641, etc).
905 source "drivers/rapidio/Kconfig"
909 config NONSTATIC_KERNEL
913 menu "Advanced setup"
916 config ADVANCED_OPTIONS
917 bool "Prompt for advanced kernel configuration options"
919 This option will enable prompting for a variety of advanced kernel
920 configuration options. These options can cause the kernel to not
921 work if they are set incorrectly, but can be used to optimize certain
922 aspects of kernel memory management.
924 Unless you know what you are doing, say N here.
926 comment "Default settings for advanced configuration options are used"
927 depends on !ADVANCED_OPTIONS
929 config LOWMEM_SIZE_BOOL
930 bool "Set maximum low memory"
931 depends on ADVANCED_OPTIONS
933 This option allows you to set the maximum amount of memory which
934 will be used as "low memory", that is, memory which the kernel can
935 access directly, without having to set up a kernel virtual mapping.
936 This can be useful in optimizing the layout of kernel virtual
939 Say N here unless you know what you are doing.
942 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
945 config LOWMEM_CAM_NUM_BOOL
946 bool "Set number of CAMs to use to map low memory"
947 depends on ADVANCED_OPTIONS && FSL_BOOKE
949 This option allows you to set the maximum number of CAM slots that
950 will be used to map low memory. There are a limited number of slots
951 available and even more limited number that will fit in the L1 MMU.
952 However, using more entries will allow mapping more low memory. This
953 can be useful in optimizing the layout of kernel virtual memory.
955 Say N here unless you know what you are doing.
957 config LOWMEM_CAM_NUM
959 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
962 config DYNAMIC_MEMSTART
963 bool "Enable page aligned dynamic load address for kernel"
964 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
965 select NONSTATIC_KERNEL
967 This option enables the kernel to be loaded at any page aligned
968 physical address. The kernel creates a mapping from KERNELBASE to
969 the address where the kernel is loaded. The page size here implies
970 the TLB page size of the mapping for kernel on the particular platform.
971 Please refer to the init code for finding the TLB page size.
973 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
974 kernel image, where the only restriction is the page aligned kernel
975 load address. When this option is enabled, the compile time physical
976 address CONFIG_PHYSICAL_START is ignored.
978 This option is overridden by CONFIG_RELOCATABLE
980 config PAGE_OFFSET_BOOL
981 bool "Set custom page offset address"
982 depends on ADVANCED_OPTIONS
984 This option allows you to set the kernel virtual address at which
985 the kernel will map low memory. This can be useful in optimizing
986 the virtual memory layout of the system.
988 Say N here unless you know what you are doing.
991 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
994 config KERNEL_START_BOOL
995 bool "Set custom kernel base address"
996 depends on ADVANCED_OPTIONS
998 This option allows you to set the kernel virtual address at which
999 the kernel will be loaded. Normally this should match PAGE_OFFSET
1000 however there are times (like kdump) that one might not want them
1003 Say N here unless you know what you are doing.
1006 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1007 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1008 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1009 default "0xc0000000"
1011 config PHYSICAL_START_BOOL
1012 bool "Set physical address where the kernel is loaded"
1013 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1015 This gives the physical address where the kernel is loaded.
1017 Say N here unless you know what you are doing.
1019 config PHYSICAL_START
1020 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1021 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1022 default "0x00000000"
1024 config PHYSICAL_ALIGN
1026 default "0x04000000" if FSL_BOOKE
1028 This value puts the alignment restrictions on physical address
1029 where kernel is loaded and run from. Kernel is compiled for an
1030 address which meets above alignment restriction.
1032 config TASK_SIZE_BOOL
1033 bool "Set custom user task size"
1034 depends on ADVANCED_OPTIONS
1036 This option allows you to set the amount of virtual address space
1037 allocated to user tasks. This can be useful in optimizing the
1038 virtual memory layout of the system.
1040 Say N here unless you know what you are doing.
1043 hex "Size of user task space" if TASK_SIZE_BOOL
1044 default "0x80000000" if PPC_8xx
1045 default "0xc0000000"
1047 config CONSISTENT_SIZE_BOOL
1048 bool "Set custom consistent memory pool size"
1049 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1051 This option allows you to set the size of the
1052 consistent memory pool. This pool of virtual memory
1053 is used to make consistent memory allocations.
1055 config CONSISTENT_SIZE
1056 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1057 default "0x00200000" if NOT_COHERENT_CACHE
1060 bool "Pinned Kernel TLBs (860 ONLY)"
1061 depends on ADVANCED_OPTIONS && 8xx
1064 bool "Pinned TLB for IMMR"
1070 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1073 default "0xc000000000000000"
1076 default "0xc000000000000000"
1077 config PHYSICAL_START
1079 default "0x00000000"
1085 source "net/Kconfig"
1087 source "drivers/Kconfig"
1091 source "lib/Kconfig"
1093 source "arch/powerpc/Kconfig.debug"
1095 source "security/Kconfig"
1097 source "crypto/Kconfig"
1099 config PPC_LIB_RHEAP
1102 source "arch/powerpc/kvm/Kconfig"
1104 source "kernel/livepatch/Kconfig"