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
169 select HAVE_ARCH_HARDENED_USERCOPY
172 def_bool CPU_LITTLE_ENDIAN
185 select COMPAT_BINFMT_ELF
186 select ARCH_WANT_OLD_COMPAT_IPC
187 select COMPAT_OLD_SIGACTION
189 config SYSVIPC_COMPAT
191 depends on COMPAT && SYSVIPC
194 # All PPC32s use generic nvram driver through ppc_md
199 config SCHED_OMIT_FRAME_POINTER
203 config ARCH_MAY_HAVE_PC_FDC
207 config PPC_UDBG_16550
211 config GENERIC_TBSYNC
213 default y if PPC32 && SMP
225 config SYS_SUPPORTS_APM_EMULATION
226 default y if PMAC_APM_EMU
232 Used to allow a board to specify it wants an ePAPR compliant wrapper.
235 config DEFAULT_UIMAGE
238 Used to allow a board to specify it wants a uImage built by default
241 config ARCH_HIBERNATION_POSSIBLE
245 config ARCH_SUSPEND_POSSIBLE
247 depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
248 (PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
251 config PPC_DCR_NATIVE
261 depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
264 config PPC_OF_PLATFORM_PCI
267 depends on PPC64 # not supported on 32 bits yet
270 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
271 depends on PPC32 || PPC_STD_MMU_64
274 config ARCH_SUPPORTS_UPROBES
277 config PPC_ADV_DEBUG_REGS
279 depends on 40x || BOOKE
282 config PPC_ADV_DEBUG_IACS
284 depends on PPC_ADV_DEBUG_REGS
288 config PPC_ADV_DEBUG_DACS
290 depends on PPC_ADV_DEBUG_REGS
293 config PPC_ADV_DEBUG_DVCS
295 depends on PPC_ADV_DEBUG_REGS
299 config PPC_ADV_DEBUG_DAC_RANGE
301 depends on PPC_ADV_DEBUG_REGS && 44x
304 config PPC_EMULATE_SSTEP
306 default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
312 config PGTABLE_LEVELS
315 default 3 if PPC_64K_PAGES && !PPC_BOOK3S_64
318 source "init/Kconfig"
320 source "kernel/Kconfig.freezer"
322 source "arch/powerpc/sysdev/Kconfig"
323 source "arch/powerpc/platforms/Kconfig"
325 menu "Kernel options"
328 bool "High memory support"
331 source kernel/Kconfig.hz
332 source kernel/Kconfig.preempt
333 source "fs/Kconfig.binfmt"
335 config HUGETLB_PAGE_SIZE_VARIABLE
337 depends on HUGETLB_PAGE
340 config MATH_EMULATION
341 bool "Math emulation"
342 depends on 4xx || 8xx || PPC_MPC832x || BOOKE
344 Some PowerPC chips designed for embedded applications do not have
345 a floating-point unit and therefore do not implement the
346 floating-point instructions in the PowerPC instruction set. If you
347 say Y here, the kernel will include code to emulate a floating-point
348 unit, which will allow programs that use floating-point
351 This is also useful to emulate missing (optional) instructions
352 such as fsqrt on cores that do have an FPU but do not implement
353 them (such as Freescale BookE).
356 prompt "Math emulation options"
357 default MATH_EMULATION_FULL
358 depends on MATH_EMULATION
360 config MATH_EMULATION_FULL
361 bool "Emulate all the floating point instructions"
363 Select this option will enable the kernel to support to emulate
364 all the floating point instructions. If your SoC doesn't have
365 a FPU, you should select this.
367 config MATH_EMULATION_HW_UNIMPLEMENTED
368 bool "Just emulate the FPU unimplemented instructions"
370 Select this if you know there does have a hardware FPU on your
371 SoC, but some floating point instructions are not implemented by that.
375 config PPC_TRANSACTIONAL_MEM
376 bool "Transactional Memory support for POWERPC"
377 depends on PPC_BOOK3S_64
383 Support user-mode Transactional Memory on POWERPC.
385 config DISABLE_MPROFILE_KERNEL
386 bool "Disable use of mprofile-kernel for kernel tracing"
387 depends on PPC64 && CPU_LITTLE_ENDIAN
390 Selecting this options disables use of the mprofile-kernel ABI for
391 kernel tracing. That will cause options such as live patching
392 (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to
395 If you have a toolchain which supports mprofile-kernel, then you can
396 enable this. Otherwise leave it disabled. If you're not sure, say
399 config MPROFILE_KERNEL
400 depends on PPC64 && CPU_LITTLE_ENDIAN
401 def_bool !DISABLE_MPROFILE_KERNEL
407 bool "SWIOTLB support"
411 Support for IO bounce buffering for systems without an IOMMU.
412 This allows us to DMA to the full physical address space on
413 platforms where the size of a physical address is larger
414 than the bus address. Not all platforms support this.
417 bool "Support for enabling/disabling CPUs"
418 depends on SMP && (PPC_PSERIES || \
419 PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
421 Say Y here to be able to disable and re-enable individual
422 CPUs at runtime on SMP machines.
424 Say N if you are unsure.
426 config ARCH_CPU_PROBE_RELEASE
428 depends on HOTPLUG_CPU
430 config ARCH_ENABLE_MEMORY_HOTPLUG
433 config ARCH_HAS_WALK_MEMORY
436 config ARCH_ENABLE_MEMORY_HOTREMOVE
439 config PPC64_SUPPORTS_MEMORY_FAILURE
440 bool "Add support for memory hwpoison"
441 depends on PPC_BOOK3S_64
442 default "y" if PPC_POWERNV
443 select ARCH_SUPPORTS_MEMORY_FAILURE
446 bool "kexec system call"
447 depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
450 kexec is a system call that implements the ability to shutdown your
451 current kernel, and to start another kernel. It is like a reboot
452 but it is independent of the system firmware. And like a reboot
453 you can start any kernel with it, not just Linux.
455 The name comes from the similarity to the exec system call.
457 It is an ongoing process to be certain the hardware in a machine
458 is properly shutdown, so do not be surprised if this code does not
459 initially work for you. As of this writing the exact hardware
460 interface is strongly in flux, so no good recommendation can be
464 bool "Build a relocatable kernel"
465 depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
466 select NONSTATIC_KERNEL
468 This builds a kernel image that is capable of running at the
469 location the kernel is loaded at. For ppc32, there is no any
470 alignment restrictions, and this feature is a superset of
471 DYNAMIC_MEMSTART and hence overrides it. For ppc64, we should use
472 16k-aligned base address. The kernel is linked as a
473 position-independent executable (PIE) and contains dynamic relocations
474 which are processed early in the bootup process.
476 One use is for the kexec on panic case where the recovery kernel
477 must live at a different physical address than the primary
480 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
481 it has been loaded at and the compile time physical addresses
482 CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
483 setting can still be useful to bootwrappers that need to know the
484 load address of the kernel (eg. u-boot/mkimage).
487 bool "Build a kdump crash kernel"
488 depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
489 select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
491 Build a kernel suitable for use as a kdump capture kernel.
492 The same kernel binary can be used as production kernel and dump
496 bool "Firmware-assisted dump"
497 depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
499 A robust mechanism to get reliable kernel crash dump with
500 assistance from firmware. This approach does not use kexec,
501 instead firmware assists in booting the kdump kernel
502 while preserving memory contents. Firmware-assisted dump
503 is meant to be a kdump replacement offering robustness and
504 speed not possible without system firmware assistance.
509 bool "Distribute interrupts on all CPUs by default"
512 This option gives the kernel permission to distribute IRQs across
513 multiple CPUs. Saying N here will route all IRQs to the first
514 CPU. Generally saying Y is safe, although some problems have been
515 reported with SMP Power Macintoshes with this option enabled.
520 default y if SMP && PPC_PSERIES
526 depends on NEED_MULTIPLE_NODES
528 config USE_PERCPU_NUMA_NODE_ID
532 config HAVE_MEMORYLESS_NODES
536 config ARCH_SELECT_MEMORY_MODEL
540 config ARCH_FLATMEM_ENABLE
542 depends on (PPC64 && !NUMA) || PPC32
544 config ARCH_SPARSEMEM_ENABLE
547 select SPARSEMEM_VMEMMAP_ENABLE
549 config ARCH_SPARSEMEM_DEFAULT
551 depends on (SMP && PPC_PSERIES) || PPC_PS3
553 config SYS_SUPPORTS_HUGETLBFS
558 config ARCH_MEMORY_PROBE
560 depends on MEMORY_HOTPLUG
562 # Some NUMA nodes have memory ranges that span
563 # other nodes. Even though a pfn is valid and
564 # between a node's start and end pfns, it may not
565 # reside on that node. See memmap_init_zone()
567 config NODES_SPAN_OTHER_NODES
569 depends on NEED_MULTIPLE_NODES
572 bool "Using standard binutils settings"
576 Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
577 Note, that kernel will be able to run only those applications,
578 which had been compiled using binutils later than 2.17.50.0.3 with
579 '-zmax-page-size' set to 256K (the default is 64K). Or, if using
580 the older binutils, you can patch them with a trivial patch, which
581 changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
587 Select the kernel logical page size. Increasing the page size
588 will reduce software overhead at each page boundary, allow
589 hardware prefetch mechanisms to be more effective, and allow
590 larger dma transfers increasing IO efficiency and reducing
591 overhead. However the utilization of memory will increase.
592 For example, each cached file will using a multiple of the
593 page size to hold its contents and the difference between the
594 end of file and the end of page is wasted.
596 Some dedicated systems, such as software raid serving with
597 accelerated calculations, have shown significant increases.
599 If you configure a 64 bit kernel for 64k pages but the
600 processor does not support them, then the kernel will simulate
601 them with 4k pages, loading them on demand, but with the
602 reduced software overhead and larger internal fragmentation.
603 For the 32 bit kernel, a large page option will not be offered
604 unless it is supported by the configured processor.
606 If unsure, choose 4K_PAGES.
610 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
614 depends on 44x || PPC_8xx
618 depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
619 select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
621 config PPC_256K_PAGES
622 bool "256k page size"
623 depends on 44x && !STDBINUTILS
625 Make the page size 256k.
627 As the ELF standard only requires alignment to support page
628 sizes up to 64k, you will need to compile all of your user
629 space applications with a non-standard binutils settings
630 (see the STDBINUTILS description for details).
632 Say N unless you know what you are doing.
636 config FORCE_MAX_ZONEORDER
637 int "Maximum zone order"
638 range 8 9 if PPC64 && PPC_64K_PAGES
639 default "9" if PPC64 && PPC_64K_PAGES
640 range 9 13 if PPC64 && !PPC_64K_PAGES
641 default "13" if PPC64 && !PPC_64K_PAGES
642 range 9 64 if PPC32 && PPC_16K_PAGES
643 default "9" if PPC32 && PPC_16K_PAGES
644 range 7 64 if PPC32 && PPC_64K_PAGES
645 default "7" if PPC32 && PPC_64K_PAGES
646 range 5 64 if PPC32 && PPC_256K_PAGES
647 default "5" if PPC32 && PPC_256K_PAGES
651 The kernel memory allocator divides physically contiguous memory
652 blocks into "zones", where each zone is a power of two number of
653 pages. This option selects the largest power of two that the kernel
654 keeps in the memory allocator. If you need to allocate very large
655 blocks of physically contiguous memory, then you may need to
658 This config option is actually maximum order plus one. For example,
659 a value of 11 means that the largest free memory block is 2^10 pages.
661 The page size is not necessarily 4KB. For example, on 64-bit
662 systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
663 this in mind when choosing a value for this option.
665 config PPC_SUBPAGE_PROT
666 bool "Support setting protections for 4k subpages"
667 depends on PPC_STD_MMU_64 && PPC_64K_PAGES
669 This option adds support for a system call to allow user programs
670 to set access permissions (read/write, readonly, or no access)
671 on the 4k subpages of each 64k page.
673 config PPC_COPRO_BASE
678 bool "SMT (Hyperthreading) scheduler support"
679 depends on PPC64 && SMP
681 SMT scheduler support improves the CPU scheduler's decision making
682 when dealing with POWER5 cpus at a cost of slightly increased
683 overhead in some places. If unsure say N here.
685 config PPC_DENORMALISATION
686 bool "PowerPC denormalisation exception handling"
687 depends on PPC_BOOK3S_64
688 default "y" if PPC_POWERNV
690 Add support for handling denormalisation of single precision
691 values. Useful for bare metal only. If unsure say Y here.
694 bool "Default bootloader kernel arguments"
697 string "Initial kernel command string"
698 depends on CMDLINE_BOOL
699 default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
701 On some platforms, there is currently no way for the boot loader to
702 pass arguments to the kernel. For these platforms, you can supply
703 some command-line options at build time by entering them here. In
704 most cases you will need to specify the root device here.
707 bool "Always use the default kernel command string"
708 depends on CMDLINE_BOOL
710 Always use the default kernel command string, even if the boot
711 loader passes other arguments to the kernel.
712 This is useful if you cannot or don't want to change the
713 command-line options your boot loader passes to the kernel.
716 string "Additional default image types"
718 List additional targets to be built by the bootwrapper here (separated
719 by spaces). This is useful for targets that depend of device tree
720 files in the .dts directory.
722 Targets in this list will be build as part of the default build
723 target, or when the user does a 'make zImage' or a
724 'make zImage.initrd'.
726 If unsure, leave blank
728 config ARCH_WANTS_FREEZER_CONTROL
732 source kernel/power/Kconfig
735 bool "Enable seccomp to safely compute untrusted bytecode"
739 This kernel feature is useful for number crunching applications
740 that may need to compute untrusted bytecode during their
741 execution. By using pipes or other transports made available to
742 the process as file descriptors supporting the read/write
743 syscalls, it's possible to isolate those applications in
744 their own address space using seccomp. Once seccomp is
745 enabled via /proc/<pid>/seccomp, it cannot be disabled
746 and the task is only allowed to execute a few safe syscalls
747 defined by each seccomp mode.
749 If unsure, say Y. Only embedded should say N here.
760 bool "Support for ISA-bus hardware"
764 Find out whether you have ISA slots on your motherboard. ISA is the
765 name of a bus system, i.e. the way the CPU talks to the other stuff
766 inside your box. If you have an Apple machine, say N here; if you
767 have an IBM RS/6000 or pSeries machine, say Y. If you have an
768 embedded board, consult your board documentation.
774 config NEED_DMA_MAP_STATE
775 def_bool (PPC64 || NOT_COHERENT_CACHE)
777 config NEED_SG_DMA_LENGTH
780 config GENERIC_ISA_DMA
782 depends on ISA_DMA_API
785 config PPC_INDIRECT_PCI
788 default y if 40x || 44x
802 select PPC_INDIRECT_PCI
808 depends on SUSPEND && (PPC_85xx || PPC_86xx)
810 Freescale MPC85xx/MPC86xx power management controller support
811 (suspend/resume). For MPC83xx see platforms/83xx/suspend.c
816 depends on SUSPEND && (44x || 40x)
818 PPC4xx Clock Power Management (CPM) support (suspend/resume).
819 It also enables support for two different idle states (idle-wait
826 bool "Freescale Local Bus support"
828 Enables reporting of errors from the Freescale local bus
829 controller. Also contains some common code used by
830 drivers for specific local bus peripherals.
834 depends on PPC_83xx || QUICC_ENGINE || CPM2
836 Freescale General-purpose Timers support
838 # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
842 # Platforms that what PCI turned unconditionally just do select PCI
843 # in their config node. Platforms that want to choose at config
844 # time should select PPC_PCI_CHOICE
845 config PPC_PCI_CHOICE
849 bool "PCI support" if PPC_PCI_CHOICE
850 default y if !40x && !CPM2 && !8xx && !PPC_83xx \
851 && !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
852 default PCI_QSPAN if !4xx && !CPM2 && 8xx
853 select GENERIC_PCI_IOMAP
855 Find out whether your system includes a PCI bus. PCI is the name of
856 a bus system, i.e. the way the CPU talks to the other stuff inside
857 your box. If you say Y here, the kernel will include drivers and
858 infrastructure code to support PCI bus devices.
868 depends on !4xx && !CPM2 && 8xx
871 Say Y here if you have a system based on a Motorola 8xx-series
872 embedded processor with a QSPAN PCI interface, otherwise say N.
876 depends on PCI && 8260
877 select PPC_INDIRECT_PCI
880 source "drivers/pci/Kconfig"
882 source "drivers/pcmcia/Kconfig"
889 tristate "RapidIO support"
890 depends on HAS_RAPIDIO || PCI
892 If you say Y here, the kernel will include drivers and
893 infrastructure code to support RapidIO interconnect devices.
896 bool "Freescale Embedded SRIO Controller support"
897 depends on RAPIDIO = y && HAS_RAPIDIO
900 Include support for RapidIO controller on Freescale embedded
901 processors (MPC8548, MPC8641, etc).
903 source "drivers/rapidio/Kconfig"
907 config NONSTATIC_KERNEL
911 menu "Advanced setup"
914 config ADVANCED_OPTIONS
915 bool "Prompt for advanced kernel configuration options"
917 This option will enable prompting for a variety of advanced kernel
918 configuration options. These options can cause the kernel to not
919 work if they are set incorrectly, but can be used to optimize certain
920 aspects of kernel memory management.
922 Unless you know what you are doing, say N here.
924 comment "Default settings for advanced configuration options are used"
925 depends on !ADVANCED_OPTIONS
927 config LOWMEM_SIZE_BOOL
928 bool "Set maximum low memory"
929 depends on ADVANCED_OPTIONS
931 This option allows you to set the maximum amount of memory which
932 will be used as "low memory", that is, memory which the kernel can
933 access directly, without having to set up a kernel virtual mapping.
934 This can be useful in optimizing the layout of kernel virtual
937 Say N here unless you know what you are doing.
940 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
943 config LOWMEM_CAM_NUM_BOOL
944 bool "Set number of CAMs to use to map low memory"
945 depends on ADVANCED_OPTIONS && FSL_BOOKE
947 This option allows you to set the maximum number of CAM slots that
948 will be used to map low memory. There are a limited number of slots
949 available and even more limited number that will fit in the L1 MMU.
950 However, using more entries will allow mapping more low memory. This
951 can be useful in optimizing the layout of kernel virtual memory.
953 Say N here unless you know what you are doing.
955 config LOWMEM_CAM_NUM
957 int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
960 config DYNAMIC_MEMSTART
961 bool "Enable page aligned dynamic load address for kernel"
962 depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
963 select NONSTATIC_KERNEL
965 This option enables the kernel to be loaded at any page aligned
966 physical address. The kernel creates a mapping from KERNELBASE to
967 the address where the kernel is loaded. The page size here implies
968 the TLB page size of the mapping for kernel on the particular platform.
969 Please refer to the init code for finding the TLB page size.
971 DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
972 kernel image, where the only restriction is the page aligned kernel
973 load address. When this option is enabled, the compile time physical
974 address CONFIG_PHYSICAL_START is ignored.
976 This option is overridden by CONFIG_RELOCATABLE
978 config PAGE_OFFSET_BOOL
979 bool "Set custom page offset address"
980 depends on ADVANCED_OPTIONS
982 This option allows you to set the kernel virtual address at which
983 the kernel will map low memory. This can be useful in optimizing
984 the virtual memory layout of the system.
986 Say N here unless you know what you are doing.
989 hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
992 config KERNEL_START_BOOL
993 bool "Set custom kernel base address"
994 depends on ADVANCED_OPTIONS
996 This option allows you to set the kernel virtual address at which
997 the kernel will be loaded. Normally this should match PAGE_OFFSET
998 however there are times (like kdump) that one might not want them
1001 Say N here unless you know what you are doing.
1004 hex "Virtual address of kernel base" if KERNEL_START_BOOL
1005 default PAGE_OFFSET if PAGE_OFFSET_BOOL
1006 default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
1007 default "0xc0000000"
1009 config PHYSICAL_START_BOOL
1010 bool "Set physical address where the kernel is loaded"
1011 depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
1013 This gives the physical address where the kernel is loaded.
1015 Say N here unless you know what you are doing.
1017 config PHYSICAL_START
1018 hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
1019 default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
1020 default "0x00000000"
1022 config PHYSICAL_ALIGN
1024 default "0x04000000" if FSL_BOOKE
1026 This value puts the alignment restrictions on physical address
1027 where kernel is loaded and run from. Kernel is compiled for an
1028 address which meets above alignment restriction.
1030 config TASK_SIZE_BOOL
1031 bool "Set custom user task size"
1032 depends on ADVANCED_OPTIONS
1034 This option allows you to set the amount of virtual address space
1035 allocated to user tasks. This can be useful in optimizing the
1036 virtual memory layout of the system.
1038 Say N here unless you know what you are doing.
1041 hex "Size of user task space" if TASK_SIZE_BOOL
1042 default "0x80000000" if PPC_8xx
1043 default "0xc0000000"
1045 config CONSISTENT_SIZE_BOOL
1046 bool "Set custom consistent memory pool size"
1047 depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
1049 This option allows you to set the size of the
1050 consistent memory pool. This pool of virtual memory
1051 is used to make consistent memory allocations.
1053 config CONSISTENT_SIZE
1054 hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
1055 default "0x00200000" if NOT_COHERENT_CACHE
1058 bool "Pinned Kernel TLBs (860 ONLY)"
1059 depends on ADVANCED_OPTIONS && 8xx
1062 bool "Pinned TLB for IMMR"
1068 # This value must have zeroes in the bottom 60 bits otherwise lots will break
1071 default "0xc000000000000000"
1074 default "0xc000000000000000"
1075 config PHYSICAL_START
1077 default "0x00000000"
1083 source "net/Kconfig"
1085 source "drivers/Kconfig"
1089 source "lib/Kconfig"
1091 source "arch/powerpc/Kconfig.debug"
1093 source "security/Kconfig"
1097 depends on COMPAT && KEYS
1100 source "crypto/Kconfig"
1102 config PPC_LIB_RHEAP
1105 source "arch/powerpc/kvm/Kconfig"
1107 source "kernel/livepatch/Kconfig"