1 source "arch/powerpc/platforms/Kconfig.cputype"
20 config ARCH_PHYS_ADDR_T_64BIT
21 def_bool PPC64 || PHYS_64BIT
23 config ARCH_DMA_ADDR_T_64BIT
24 def_bool ARCH_PHYS_ADDR_T_64BIT
30 config HAVE_SETUP_PER_CPU_AREA
33 config NEED_PER_CPU_EMBED_FIRST_CHUNK
37 int "Number of virtual interrupt numbers"
41 This defines the number of virtual interrupt numbers the kernel
42 can manage. Virtual interrupt numbers are what you see in
43 /proc/interrupts. If you configure your system to have too few,
44 drivers will fail to load or worse - handle with care.
46 config STACKTRACE_SUPPORT
50 config TRACE_IRQFLAGS_SUPPORT
54 config LOCKDEP_SUPPORT
58 config RWSEM_GENERIC_SPINLOCK
61 config RWSEM_XCHGADD_ALGORITHM
65 config GENERIC_LOCKBREAK
68 depends on SMP && PREEMPT
70 config ARCH_HAS_ILOG2_U32
74 config ARCH_HAS_ILOG2_U64
78 config GENERIC_HWEIGHT
82 config ARCH_HAS_DMA_SET_COHERENT_MASK
88 select ARCH_MIGHT_HAVE_PC_PARPORT
89 select ARCH_MIGHT_HAVE_PC_SERIO
91 select ARCH_HAS_ELF_RANDOMIZE
93 select OF_EARLY_FLATTREE
94 select OF_RESERVED_MEM
95 select HAVE_FTRACE_MCOUNT_RECORD
96 select HAVE_DYNAMIC_FTRACE
97 select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
98 select HAVE_FUNCTION_TRACER
99 select HAVE_FUNCTION_GRAPH_TRACER
100 select SYSCTL_EXCEPTION_TRACE
101 select VIRT_TO_BUS if !PPC64
103 select HAVE_IOREMAP_PROT
104 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_LITTLE_ENDIAN
106 select HAVE_ARCH_KGDB
107 select HAVE_KRETPROBES
108 select HAVE_ARCH_TRACEHOOK
110 select HAVE_MEMBLOCK_NODE_MAP
111 select HAVE_DMA_API_DEBUG
113 select HAVE_DEBUG_KMEMLEAK
114 select ARCH_HAS_SG_CHAIN
115 select GENERIC_ATOMIC64 if PPC32
116 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
117 select HAVE_PERF_EVENTS
118 select HAVE_PERF_REGS
119 select HAVE_PERF_USER_STACK_DUMP
120 select HAVE_REGS_AND_STACK_ACCESS_API
121 select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
122 select ARCH_WANT_IPC_PARSE_VERSION
125 select GENERIC_IRQ_SHOW
126 select GENERIC_IRQ_SHOW_LEVEL
127 select IRQ_FORCED_THREADING
128 select HAVE_RCU_TABLE_FREE if SMP
129 select HAVE_SYSCALL_TRACEPOINTS
130 select HAVE_CBPF_JIT if !PPC64
131 select HAVE_EBPF_JIT if PPC64
132 select HAVE_ARCH_JUMP_LABEL
133 select ARCH_HAVE_NMI_SAFE_CMPXCHG
134 select ARCH_HAS_GCOV_PROFILE_ALL
135 select GENERIC_SMP_IDLE_THREAD
136 select GENERIC_CMOS_UPDATE
137 select GENERIC_TIME_VSYSCALL_OLD
138 select GENERIC_CLOCKEVENTS
139 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
140 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
141 select GENERIC_STRNCPY_FROM_USER
142 select GENERIC_STRNLEN_USER
143 select HAVE_MOD_ARCH_SPECIFIC
144 select MODULES_USE_ELF_RELA
145 select CLONE_BACKWARDS
146 select ARCH_USE_BUILTIN_BSWAP
147 select OLD_SIGSUSPEND
148 select OLD_SIGACTION if PPC32
149 select HAVE_DEBUG_STACKOVERFLOW
150 select HAVE_IRQ_EXIT_ON_IRQ_STACK
151 select ARCH_USE_CMPXCHG_LOCKREF if PPC64
152 select HAVE_ARCH_AUDITSYSCALL
153 select ARCH_SUPPORTS_ATOMIC_RMW
154 select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
156 select HAVE_GENERIC_RCU_GUP
157 select HAVE_PERF_EVENTS_NMI if PPC64
158 select HAVE_NMI if PERF_EVENTS
160 select EDAC_ATOMIC_SCRUB
161 select ARCH_HAS_DMA_SET_COHERENT_MASK
162 select ARCH_HAS_DEVMEM_IS_ALLOWED
163 select HAVE_ARCH_SECCOMP_FILTER
164 select ARCH_HAS_UBSAN_SANITIZE_ALL
165 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
166 select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
167 select GENERIC_CPU_AUTOPROBE
168 select HAVE_VIRT_CPU_ACCOUNTING
171 def_bool CPU_LITTLE_ENDIAN
184 select COMPAT_BINFMT_ELF
185 select ARCH_WANT_OLD_COMPAT_IPC
186 select COMPAT_OLD_SIGACTION
188 config SYSVIPC_COMPAT
190 depends on COMPAT && SYSVIPC
193 # All PPC32s use generic nvram driver through ppc_md
198 config SCHED_OMIT_FRAME_POINTER
202 config ARCH_MAY_HAVE_PC_FDC
206 config PPC_UDBG_16550
210 config GENERIC_TBSYNC
212 default y if PPC32 && SMP
224 config SYS_SUPPORTS_APM_EMULATION
225 default y if PMAC_APM_EMU
231 Used to allow a board to specify it wants an ePAPR compliant wrapper.
234 config DEFAULT_UIMAGE
237 Used to allow a board to specify it wants a uImage built by default
240 config ARCH_HIBERNATION_POSSIBLE
244 config ARCH_SUSPEND_POSSIBLE
246 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
247 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
250 config PPC_DCR_NATIVE
260 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
263 config PPC_OF_PLATFORM_PCI
266 depends on PPC64 # not supported on 32 bits yet
269 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
270 depends on PPC32 || PPC_STD_MMU_64
273 config ARCH_SUPPORTS_UPROBES
276 config PPC_ADV_DEBUG_REGS
278 depends on 40x || BOOKE
281 config PPC_ADV_DEBUG_IACS
283 depends on PPC_ADV_DEBUG_REGS
287 config PPC_ADV_DEBUG_DACS
289 depends on PPC_ADV_DEBUG_REGS
292 config PPC_ADV_DEBUG_DVCS
294 depends on PPC_ADV_DEBUG_REGS
298 config PPC_ADV_DEBUG_DAC_RANGE
300 depends on PPC_ADV_DEBUG_REGS && 44x
303 config PPC_EMULATE_SSTEP
305 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
311 config PGTABLE_LEVELS
314 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
317 source "init/Kconfig"
319 source "kernel/Kconfig.freezer"
321 source "arch/powerpc/sysdev/Kconfig"
322 source "arch/powerpc/platforms/Kconfig"
324 menu "Kernel options"
327 bool "High memory support"
330 source kernel/Kconfig.hz
331 source kernel/Kconfig.preempt
332 source "fs/Kconfig.binfmt"
334 config HUGETLB_PAGE_SIZE_VARIABLE
336 depends on HUGETLB_PAGE
339 config MATH_EMULATION
340 bool "Math emulation"
341 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
343 Some PowerPC chips designed for embedded applications do not have
344 a floating-point unit and therefore do not implement the
345 floating-point instructions in the PowerPC instruction set. If you
346 say Y here, the kernel will include code to emulate a floating-point
347 unit, which will allow programs that use floating-point
350 This is also useful to emulate missing (optional) instructions
351 such as fsqrt on cores that do have an FPU but do not implement
352 them (such as Freescale BookE).
355 prompt "Math emulation options"
356 default MATH_EMULATION_FULL
357 depends on MATH_EMULATION
359 config MATH_EMULATION_FULL
360 bool "Emulate all the floating point instructions"
362 Select this option will enable the kernel to support to emulate
363 all the floating point instructions. If your SoC doesn't have
364 a FPU, you should select this.
366 config MATH_EMULATION_HW_UNIMPLEMENTED
367 bool "Just emulate the FPU unimplemented instructions"
369 Select this if you know there does have a hardware FPU on your
370 SoC, but some floating point instructions are not implemented by that.
374 config PPC_TRANSACTIONAL_MEM
375 bool "Transactional Memory support for POWERPC"
376 depends on PPC_BOOK3S_64
382 Support user-mode Transactional Memory on POWERPC.
384 config DISABLE_MPROFILE_KERNEL
385 bool "Disable use of mprofile-kernel for kernel tracing"
386 depends on PPC64 && CPU_LITTLE_ENDIAN
389 Selecting this options disables use of the mprofile-kernel ABI for
390 kernel tracing. That will cause options such as live patching
391 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
394 If you have a toolchain which supports mprofile-kernel, then you can
395 enable this. Otherwise leave it disabled. If you're not sure, say
398 config MPROFILE_KERNEL
399 depends on PPC64 && CPU_LITTLE_ENDIAN
400 def_bool !DISABLE_MPROFILE_KERNEL
406 bool "SWIOTLB support"
410 Support for IO bounce buffering for systems without an IOMMU.
411 This allows us to DMA to the full physical address space on
412 platforms where the size of a physical address is larger
413 than the bus address. Not all platforms support this.
416 bool "Support for enabling/disabling CPUs"
417 depends on SMP && (PPC_PSERIES || \
418 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
420 Say Y here to be able to disable and re-enable individual
421 CPUs at runtime on SMP machines.
423 Say N if you are unsure.
425 config ARCH_CPU_PROBE_RELEASE
427 depends on HOTPLUG_CPU
429 config ARCH_ENABLE_MEMORY_HOTPLUG
432 config ARCH_HAS_WALK_MEMORY
435 config ARCH_ENABLE_MEMORY_HOTREMOVE
438 config PPC64_SUPPORTS_MEMORY_FAILURE
439 bool "Add support for memory hwpoison"
440 depends on PPC_BOOK3S_64
441 default "y" if PPC_POWERNV
442 select ARCH_SUPPORTS_MEMORY_FAILURE
445 bool "kexec system call"
446 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
449 kexec is a system call that implements the ability to shutdown your
450 current kernel, and to start another kernel. It is like a reboot
451 but it is independent of the system firmware. And like a reboot
452 you can start any kernel with it, not just Linux.
454 The name comes from the similarity to the exec system call.
456 It is an ongoing process to be certain the hardware in a machine
457 is properly shutdown, so do not be surprised if this code does not
458 initially work for you. As of this writing the exact hardware
459 interface is strongly in flux, so no good recommendation can be
463 bool "Build a relocatable kernel"
464 depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
465 select NONSTATIC_KERNEL
467 This builds a kernel image that is capable of running at the
468 location the kernel is loaded at. For ppc32, there is no any
469 alignment restrictions, and this feature is a superset of
470 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
471 16k-aligned base address. The kernel is linked as a
472 position-independent executable (PIE) and contains dynamic relocations
473 which are processed early in the bootup process.
475 One use is for the kexec on panic case where the recovery kernel
476 must live at a different physical address than the primary
479 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
480 it has been loaded at and the compile time physical addresses
481 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
482 setting can still be useful to bootwrappers that need to know the
483 load address of the kernel (eg. u-boot/mkimage).
486 bool "Build a kdump crash kernel"
487 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
488 select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
490 Build a kernel suitable for use as a kdump capture kernel.
491 The same kernel binary can be used as production kernel and dump
495 bool "Firmware-assisted dump"
496 depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
498 A robust mechanism to get reliable kernel crash dump with
499 assistance from firmware. This approach does not use kexec,
500 instead firmware assists in booting the kdump kernel
501 while preserving memory contents. Firmware-assisted dump
502 is meant to be a kdump replacement offering robustness and
503 speed not possible without system firmware assistance.
508 bool "Distribute interrupts on all CPUs by default"
511 This option gives the kernel permission to distribute IRQs across
512 multiple CPUs. Saying N here will route all IRQs to the first
513 CPU. Generally saying Y is safe, although some problems have been
514 reported with SMP Power Macintoshes with this option enabled.
519 default y if SMP && PPC_PSERIES
525 depends on NEED_MULTIPLE_NODES
527 config USE_PERCPU_NUMA_NODE_ID
531 config HAVE_MEMORYLESS_NODES
535 config ARCH_SELECT_MEMORY_MODEL
539 config ARCH_FLATMEM_ENABLE
541 depends on (PPC64 && !NUMA) || PPC32
543 config ARCH_SPARSEMEM_ENABLE
546 select SPARSEMEM_VMEMMAP_ENABLE
548 config ARCH_SPARSEMEM_DEFAULT
550 depends on (SMP && PPC_PSERIES) || PPC_PS3
552 config SYS_SUPPORTS_HUGETLBFS
557 config ARCH_MEMORY_PROBE
559 depends on MEMORY_HOTPLUG
561 # Some NUMA nodes have memory ranges that span
562 # other nodes. Even though a pfn is valid and
563 # between a node's start and end pfns, it may not
564 # reside on that node. See memmap_init_zone()
566 config NODES_SPAN_OTHER_NODES
568 depends on NEED_MULTIPLE_NODES
571 bool "Using standard binutils settings"
575 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
576 Note, that kernel will be able to run only those applications,
577 which had been compiled using binutils later than 2.17.50.0.3 with
578 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
579 the older binutils, you can patch them with a trivial patch, which
580 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
586 Select the kernel logical page size. Increasing the page size
587 will reduce software overhead at each page boundary, allow
588 hardware prefetch mechanisms to be more effective, and allow
589 larger dma transfers increasing IO efficiency and reducing
590 overhead. However the utilization of memory will increase.
591 For example, each cached file will using a multiple of the
592 page size to hold its contents and the difference between the
593 end of file and the end of page is wasted.
595 Some dedicated systems, such as software raid serving with
596 accelerated calculations, have shown significant increases.
598 If you configure a 64 bit kernel for 64k pages but the
599 processor does not support them, then the kernel will simulate
600 them with 4k pages, loading them on demand, but with the
601 reduced software overhead and larger internal fragmentation.
602 For the 32 bit kernel, a large page option will not be offered
603 unless it is supported by the configured processor.
605 If unsure, choose 4K_PAGES.
609 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
613 depends on 44x || PPC_8xx
617 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
618 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
620 config PPC_256K_PAGES
621 bool "256k page size"
622 depends on 44x && !STDBINUTILS
624 Make the page size 256k.
626 As the ELF standard only requires alignment to support page
627 sizes up to 64k, you will need to compile all of your user
628 space applications with a non-standard binutils settings
629 (see the STDBINUTILS description for details).
631 Say N unless you know what you are doing.
635 config FORCE_MAX_ZONEORDER
636 int "Maximum zone order"
637 range 8 9 if PPC64 && PPC_64K_PAGES
638 default "9" if PPC64 && PPC_64K_PAGES
639 range 9 13 if PPC64 && !PPC_64K_PAGES
640 default "13" if PPC64 && !PPC_64K_PAGES
641 range 9 64 if PPC32 && PPC_16K_PAGES
642 default "9" if PPC32 && PPC_16K_PAGES
643 range 7 64 if PPC32 && PPC_64K_PAGES
644 default "7" if PPC32 && PPC_64K_PAGES
645 range 5 64 if PPC32 && PPC_256K_PAGES
646 default "5" if PPC32 && PPC_256K_PAGES
650 The kernel memory allocator divides physically contiguous memory
651 blocks into "zones", where each zone is a power of two number of
652 pages. This option selects the largest power of two that the kernel
653 keeps in the memory allocator. If you need to allocate very large
654 blocks of physically contiguous memory, then you may need to
657 This config option is actually maximum order plus one. For example,
658 a value of 11 means that the largest free memory block is 2^10 pages.
660 The page size is not necessarily 4KB. For example, on 64-bit
661 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
662 this in mind when choosing a value for this option.
664 config PPC_SUBPAGE_PROT
665 bool "Support setting protections for 4k subpages"
666 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
668 This option adds support for a system call to allow user programs
669 to set access permissions (read/write, readonly, or no access)
670 on the 4k subpages of each 64k page.
672 config PPC_COPRO_BASE
677 bool "SMT (Hyperthreading) scheduler support"
678 depends on PPC64 && SMP
680 SMT scheduler support improves the CPU scheduler's decision making
681 when dealing with POWER5 cpus at a cost of slightly increased
682 overhead in some places. If unsure say N here.
684 config PPC_DENORMALISATION
685 bool "PowerPC denormalisation exception handling"
686 depends on PPC_BOOK3S_64
687 default "y" if PPC_POWERNV
689 Add support for handling denormalisation of single precision
690 values. Useful for bare metal only. If unsure say Y here.
693 bool "Default bootloader kernel arguments"
696 string "Initial kernel command string"
697 depends on CMDLINE_BOOL
698 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
700 On some platforms, there is currently no way for the boot loader to
701 pass arguments to the kernel. For these platforms, you can supply
702 some command-line options at build time by entering them here. In
703 most cases you will need to specify the root device here.
706 bool "Always use the default kernel command string"
707 depends on CMDLINE_BOOL
709 Always use the default kernel command string, even if the boot
710 loader passes other arguments to the kernel.
711 This is useful if you cannot or don't want to change the
712 command-line options your boot loader passes to the kernel.
715 string "Additional default image types"
717 List additional targets to be built by the bootwrapper here (separated
718 by spaces). This is useful for targets that depend of device tree
719 files in the .dts directory.
721 Targets in this list will be build as part of the default build
722 target, or when the user does a 'make zImage' or a
723 'make zImage.initrd'.
725 If unsure, leave blank
727 config ARCH_WANTS_FREEZER_CONTROL
731 source kernel/power/Kconfig
734 bool "Enable seccomp to safely compute untrusted bytecode"
738 This kernel feature is useful for number crunching applications
739 that may need to compute untrusted bytecode during their
740 execution. By using pipes or other transports made available to
741 the process as file descriptors supporting the read/write
742 syscalls, it's possible to isolate those applications in
743 their own address space using seccomp. Once seccomp is
744 enabled via /proc/<pid>/seccomp, it cannot be disabled
745 and the task is only allowed to execute a few safe syscalls
746 defined by each seccomp mode.
748 If unsure, say Y. Only embedded should say N here.
759 bool "Support for ISA-bus hardware"
763 Find out whether you have ISA slots on your motherboard. ISA is the
764 name of a bus system, i.e. the way the CPU talks to the other stuff
765 inside your box. If you have an Apple machine, say N here; if you
766 have an IBM RS/6000 or pSeries machine, say Y. If you have an
767 embedded board, consult your board documentation.
773 config NEED_DMA_MAP_STATE
774 def_bool (PPC64 || NOT_COHERENT_CACHE)
776 config NEED_SG_DMA_LENGTH
779 config GENERIC_ISA_DMA
781 depends on ISA_DMA_API
784 config PPC_INDIRECT_PCI
787 default y if 40x || 44x
801 select PPC_INDIRECT_PCI
807 depends on SUSPEND && (PPC_85xx || PPC_86xx)
809 Freescale MPC85xx/MPC86xx power management controller support
810 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
815 depends on SUSPEND && (44x || 40x)
817 PPC4xx Clock Power Management (CPM) support (suspend/resume).
818 It also enables support for two different idle states (idle-wait
825 bool "Freescale Local Bus support"
827 Enables reporting of errors from the Freescale local bus
828 controller. Also contains some common code used by
829 drivers for specific local bus peripherals.
833 depends on PPC_83xx || QUICC_ENGINE || CPM2
835 Freescale General-purpose Timers support
837 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
841 # Platforms that what PCI turned unconditionally just do select PCI
842 # in their config node. Platforms that want to choose at config
843 # time should select PPC_PCI_CHOICE
844 config PPC_PCI_CHOICE
848 bool "PCI support" if PPC_PCI_CHOICE
849 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
850 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
851 default PCI_QSPAN if !4xx && !CPM2 && 8xx
852 select GENERIC_PCI_IOMAP
854 Find out whether your system includes a PCI bus. PCI is the name of
855 a bus system, i.e. the way the CPU talks to the other stuff inside
856 your box. If you say Y here, the kernel will include drivers and
857 infrastructure code to support PCI bus devices.
867 depends on !4xx && !CPM2 && 8xx
870 Say Y here if you have a system based on a Motorola 8xx-series
871 embedded processor with a QSPAN PCI interface, otherwise say N.
875 depends on PCI && 8260
876 select PPC_INDIRECT_PCI
879 source "drivers/pci/Kconfig"
881 source "drivers/pcmcia/Kconfig"
888 tristate "RapidIO support"
889 depends on HAS_RAPIDIO || PCI
891 If you say Y here, the kernel will include drivers and
892 infrastructure code to support RapidIO interconnect devices.
895 bool "Freescale Embedded SRIO Controller support"
896 depends on RAPIDIO = y && HAS_RAPIDIO
899 Include support for RapidIO controller on Freescale embedded
900 processors (MPC8548, MPC8641, etc).
902 source "drivers/rapidio/Kconfig"
906 config NONSTATIC_KERNEL
910 menu "Advanced setup"
913 config ADVANCED_OPTIONS
914 bool "Prompt for advanced kernel configuration options"
916 This option will enable prompting for a variety of advanced kernel
917 configuration options. These options can cause the kernel to not
918 work if they are set incorrectly, but can be used to optimize certain
919 aspects of kernel memory management.
921 Unless you know what you are doing, say N here.
923 comment "Default settings for advanced configuration options are used"
924 depends on !ADVANCED_OPTIONS
926 config LOWMEM_SIZE_BOOL
927 bool "Set maximum low memory"
928 depends on ADVANCED_OPTIONS
930 This option allows you to set the maximum amount of memory which
931 will be used as "low memory", that is, memory which the kernel can
932 access directly, without having to set up a kernel virtual mapping.
933 This can be useful in optimizing the layout of kernel virtual
936 Say N here unless you know what you are doing.
939 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
942 config LOWMEM_CAM_NUM_BOOL
943 bool "Set number of CAMs to use to map low memory"
944 depends on ADVANCED_OPTIONS && FSL_BOOKE
946 This option allows you to set the maximum number of CAM slots that
947 will be used to map low memory. There are a limited number of slots
948 available and even more limited number that will fit in the L1 MMU.
949 However, using more entries will allow mapping more low memory. This
950 can be useful in optimizing the layout of kernel virtual memory.
952 Say N here unless you know what you are doing.
954 config LOWMEM_CAM_NUM
956 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
959 config DYNAMIC_MEMSTART
960 bool "Enable page aligned dynamic load address for kernel"
961 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
962 select NONSTATIC_KERNEL
964 This option enables the kernel to be loaded at any page aligned
965 physical address. The kernel creates a mapping from KERNELBASE to
966 the address where the kernel is loaded. The page size here implies
967 the TLB page size of the mapping for kernel on the particular platform.
968 Please refer to the init code for finding the TLB page size.
970 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
971 kernel image, where the only restriction is the page aligned kernel
972 load address. When this option is enabled, the compile time physical
973 address CONFIG_PHYSICAL_START is ignored.
975 This option is overridden by CONFIG_RELOCATABLE
977 config PAGE_OFFSET_BOOL
978 bool "Set custom page offset address"
979 depends on ADVANCED_OPTIONS
981 This option allows you to set the kernel virtual address at which
982 the kernel will map low memory. This can be useful in optimizing
983 the virtual memory layout of the system.
985 Say N here unless you know what you are doing.
988 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
991 config KERNEL_START_BOOL
992 bool "Set custom kernel base address"
993 depends on ADVANCED_OPTIONS
995 This option allows you to set the kernel virtual address at which
996 the kernel will be loaded. Normally this should match PAGE_OFFSET
997 however there are times (like kdump) that one might not want them
1000 Say N here unless you know what you are doing.
1003 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1004 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1005 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1006 default "0xc0000000"
1008 config PHYSICAL_START_BOOL
1009 bool "Set physical address where the kernel is loaded"
1010 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1012 This gives the physical address where the kernel is loaded.
1014 Say N here unless you know what you are doing.
1016 config PHYSICAL_START
1017 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1018 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1019 default "0x00000000"
1021 config PHYSICAL_ALIGN
1023 default "0x04000000" if FSL_BOOKE
1025 This value puts the alignment restrictions on physical address
1026 where kernel is loaded and run from. Kernel is compiled for an
1027 address which meets above alignment restriction.
1029 config TASK_SIZE_BOOL
1030 bool "Set custom user task size"
1031 depends on ADVANCED_OPTIONS
1033 This option allows you to set the amount of virtual address space
1034 allocated to user tasks. This can be useful in optimizing the
1035 virtual memory layout of the system.
1037 Say N here unless you know what you are doing.
1040 hex "Size of user task space" if TASK_SIZE_BOOL
1041 default "0x80000000" if PPC_8xx
1042 default "0xc0000000"
1044 config CONSISTENT_SIZE_BOOL
1045 bool "Set custom consistent memory pool size"
1046 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1048 This option allows you to set the size of the
1049 consistent memory pool. This pool of virtual memory
1050 is used to make consistent memory allocations.
1052 config CONSISTENT_SIZE
1053 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1054 default "0x00200000" if NOT_COHERENT_CACHE
1057 bool "Pinned Kernel TLBs (860 ONLY)"
1058 depends on ADVANCED_OPTIONS && 8xx
1061 bool "Pinned TLB for IMMR"
1067 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1070 default "0xc000000000000000"
1073 default "0xc000000000000000"
1074 config PHYSICAL_START
1076 default "0x00000000"
1082 source "net/Kconfig"
1084 source "drivers/Kconfig"
1088 source "lib/Kconfig"
1090 source "arch/powerpc/Kconfig.debug"
1092 source "security/Kconfig"
1096 depends on COMPAT && KEYS
1099 source "crypto/Kconfig"
1101 config PPC_LIB_RHEAP
1104 source "arch/powerpc/kvm/Kconfig"
1106 source "kernel/livepatch/Kconfig"