Kconfig 62.0 KB
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config ARM
	bool
	default y
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	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
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	select ARCH_HAS_ELF_RANDOMIZE
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	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
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	select ARCH_HAVE_CUSTOM_GPIO_H
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	select ARCH_HAS_GCOV_PROFILE_ALL
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	select ARCH_MIGHT_HAVE_PC_PARPORT
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	select ARCH_SUPPORTS_ATOMIC_RMW
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	select ARCH_USE_BUILTIN_BSWAP
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	select ARCH_USE_CMPXCHG_LOCKREF
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	select ARCH_WANT_IPC_PARSE_VERSION
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	select BUILDTIME_EXTABLE_SORT if MMU
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	select CLONE_BACKWARDS
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	select CPU_PM if (SUSPEND || CPU_IDLE)
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	select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
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	select EDAC_SUPPORT
	select EDAC_ATOMIC_SCRUB
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	select GENERIC_ALLOCATOR
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	select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
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	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
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	select GENERIC_IDLE_POLL_SETUP
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	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
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	select GENERIC_IRQ_SHOW_LEVEL
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	select GENERIC_PCI_IOMAP
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	select GENERIC_SCHED_CLOCK
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	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_STRNCPY_FROM_USER
	select GENERIC_STRNLEN_USER
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	select HANDLE_DOMAIN_IRQ
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	select HARDIRQS_SW_RESEND
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	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
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	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
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	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32
	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32
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	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
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	select HAVE_ARCH_TRACEHOOK
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	select HAVE_BPF_JIT
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	select HAVE_CC_STACKPROTECTOR
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	select HAVE_CONTEXT_TRACKING
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	select HAVE_C_RECORDMCOUNT
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_API_DEBUG
	select HAVE_DMA_ATTRS
	select HAVE_DMA_CONTIGUOUS if MMU
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	select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32
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	select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
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	select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
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	select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
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	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
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	select HAVE_GENERIC_DMA_COHERENT
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	select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
	select HAVE_IDE if PCI || ISA || PCMCIA
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	select HAVE_IRQ_TIME_ACCOUNTING
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	select HAVE_KERNEL_GZIP
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	select HAVE_KERNEL_LZ4
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	select HAVE_KERNEL_LZMA
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	select HAVE_KERNEL_LZO
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	select HAVE_KERNEL_XZ
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	select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
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	select HAVE_KRETPROBES if (HAVE_KPROBES)
	select HAVE_MEMBLOCK
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	select HAVE_MOD_ARCH_SPECIFIC
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	select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
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	select HAVE_OPTPROBES if !THUMB2_KERNEL
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	select HAVE_PERF_EVENTS
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	select HAVE_PERF_REGS
	select HAVE_PERF_USER_STACK_DUMP
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	select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
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	select HAVE_REGS_AND_STACK_ACCESS_API
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	select HAVE_SYSCALL_TRACEPOINTS
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	select HAVE_UID16
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	select HAVE_VIRT_CPU_ACCOUNTING_GEN
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	select IRQ_FORCED_THREADING
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	select MODULES_USE_ELF_REL
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	select NO_BOOTMEM
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	select OF_EARLY_FLATTREE if OF
	select OF_RESERVED_MEM if OF
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	select OLD_SIGACTION
	select OLD_SIGSUSPEND3
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	select PERF_USE_VMALLOC
	select RTC_LIB
	select SYS_SUPPORTS_APM_EMULATION
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	# Above selects are sorted alphabetically; please add new ones
	# according to that.  Thanks.
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	help
	  The ARM series is a line of low-power-consumption RISC chip designs
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	  licensed by ARM Ltd and targeted at embedded applications and
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	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
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	  manufactured, but legacy ARM-based PC hardware remains popular in
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	  Europe.  There is an ARM Linux project with a web page at
	  <http://www.arm.linux.org.uk/>.

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config ARM_HAS_SG_CHAIN
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	select ARCH_HAS_SG_CHAIN
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	bool

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config NEED_SG_DMA_LENGTH
	bool

config ARM_DMA_USE_IOMMU
	bool
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	select ARM_HAS_SG_CHAIN
	select NEED_SG_DMA_LENGTH
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if ARM_DMA_USE_IOMMU

config ARM_DMA_IOMMU_ALIGNMENT
	int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
	range 4 9
	default 8
	help
	  DMA mapping framework by default aligns all buffers to the smallest
	  PAGE_SIZE order which is greater than or equal to the requested buffer
	  size. This works well for buffers up to a few hundreds kilobytes, but
	  for larger buffers it just a waste of address space. Drivers which has
	  relatively small addressing window (like 64Mib) might run out of
	  virtual space with just a few allocations.

	  With this parameter you can specify the maximum PAGE_SIZE order for
	  DMA IOMMU buffers. Larger buffers will be aligned only to this
	  specified order. The order is expressed as a power of two multiplied
	  by the PAGE_SIZE.

endif

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config MIGHT_HAVE_PCI
	bool

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config SYS_SUPPORTS_APM_EMULATION
	bool

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config HAVE_TCM
	bool
	select GENERIC_ALLOCATOR

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config HAVE_PROC_CPU
	bool

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config NO_IOPORT_MAP
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	bool

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config EISA
	bool
	---help---
	  The Extended Industry Standard Architecture (EISA) bus was
	  developed as an open alternative to the IBM MicroChannel bus.

	  The EISA bus provided some of the features of the IBM MicroChannel
	  bus while maintaining backward compatibility with cards made for
	  the older ISA bus.  The EISA bus saw limited use between 1988 and
	  1995 when it was made obsolete by the PCI bus.

	  Say Y here if you are building a kernel for an EISA-based machine.

	  Otherwise, say N.

config SBUS
	bool

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config STACKTRACE_SUPPORT
	bool
	default y

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config HAVE_LATENCYTOP_SUPPORT
	bool
	depends on !SMP
	default y

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config LOCKDEP_SUPPORT
	bool
	default y

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config TRACE_IRQFLAGS_SUPPORT
	bool
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	default !CPU_V7M
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config RWSEM_XCHGADD_ALGORITHM
	bool
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	default y
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config ARCH_HAS_ILOG2_U32
	bool

config ARCH_HAS_ILOG2_U64
	bool

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config ARCH_HAS_BANDGAP
	bool

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config FIX_EARLYCON_MEM
	def_bool y if MMU

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config GENERIC_HWEIGHT
	bool
	default y

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config GENERIC_CALIBRATE_DELAY
	bool
	default y

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config ARCH_MAY_HAVE_PC_FDC
	bool

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config ZONE_DMA
	bool

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config NEED_DMA_MAP_STATE
       def_bool y

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config ARCH_SUPPORTS_UPROBES
	def_bool y

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config ARCH_HAS_DMA_SET_COHERENT_MASK
	bool

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config GENERIC_ISA_DMA
	bool

config FIQ
	bool

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config NEED_RET_TO_USER
	bool

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config ARCH_MTD_XIP
	bool

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config VECTORS_BASE
	hex
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	default 0xffff0000 if MMU || CPU_HIGH_VECTOR
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	default DRAM_BASE if REMAP_VECTORS_TO_RAM
	default 0x00000000
	help
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	  The base address of exception vectors.  This must be two pages
	  in size.
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config ARM_PATCH_PHYS_VIRT
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	bool "Patch physical to virtual translations at runtime" if EMBEDDED
	default y
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	depends on !XIP_KERNEL && MMU
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	depends on !ARCH_REALVIEW || !SPARSEMEM
	help
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	  Patch phys-to-virt and virt-to-phys translation functions at
	  boot and module load time according to the position of the
	  kernel in system memory.
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	  This can only be used with non-XIP MMU kernels where the base
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	  of physical memory is at a 16MB boundary.
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	  Only disable this option if you know that you do not require
	  this feature (eg, building a kernel for a single machine) and
	  you need to shrink the kernel to the minimal size.
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config NEED_MACH_IO_H
	bool
	help
	  Select this when mach/io.h is required to provide special
	  definitions for this platform.  The need for mach/io.h should
	  be avoided when possible.

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config NEED_MACH_MEMORY_H
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	bool
	help
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	  Select this when mach/memory.h is required to provide special
	  definitions for this platform.  The need for mach/memory.h should
	  be avoided when possible.
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config PHYS_OFFSET
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	hex "Physical address of main memory" if MMU
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	depends on !ARM_PATCH_PHYS_VIRT
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	default DRAM_BASE if !MMU
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	default 0x00000000 if ARCH_EBSA110 || \
			ARCH_FOOTBRIDGE || \
			ARCH_INTEGRATOR || \
			ARCH_IOP13XX || \
			ARCH_KS8695 || \
			(ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
	default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
	default 0x20000000 if ARCH_S5PV210
	default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
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	default 0xc0000000 if ARCH_SA1100
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	help
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	  Please provide the physical address corresponding to the
	  location of main memory in your system.
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config GENERIC_BUG
	def_bool y
	depends on BUG

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config PGTABLE_LEVELS
	int
	default 3 if ARM_LPAE
	default 2

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source "init/Kconfig"

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source "kernel/Kconfig.freezer"

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menu "System Type"

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config MMU
	bool "MMU-based Paged Memory Management Support"
	default y
	help
	  Select if you want MMU-based virtualised addressing space
	  support by paged memory management. If unsure, say 'Y'.

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#
# The "ARM system type" choice list is ordered alphabetically by option
# text.  Please add new entries in the option alphabetic order.
#
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choice
	prompt "ARM system type"
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	default ARCH_VERSATILE if !MMU
	default ARCH_MULTIPLATFORM if MMU
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config ARCH_MULTIPLATFORM
	bool "Allow multiple platforms to be selected"
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	depends on MMU
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	select ARCH_WANT_OPTIONAL_GPIOLIB
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	select ARM_HAS_SG_CHAIN
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	select ARM_PATCH_PHYS_VIRT
	select AUTO_ZRELADDR
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	select CLKSRC_OF
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	select COMMON_CLK
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	select GENERIC_CLOCKEVENTS
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	select MIGHT_HAVE_PCI
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	select MULTI_IRQ_HANDLER
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	select SPARSE_IRQ
	select USE_OF

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config ARM_SINGLE_ARMV7M
	bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
	depends on !MMU
	select ARCH_WANT_OPTIONAL_GPIOLIB
	select ARM_NVIC
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	select AUTO_ZRELADDR
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	select CLKSRC_OF
	select COMMON_CLK
	select CPU_V7M
	select GENERIC_CLOCKEVENTS
	select NO_IOPORT_MAP
	select SPARSE_IRQ
	select USE_OF

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config ARCH_REALVIEW
	bool "ARM Ltd. RealView family"
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	select ARCH_WANT_OPTIONAL_GPIOLIB
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	select ARM_AMBA
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	select ARM_TIMER_SP804
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	select COMMON_CLK
	select COMMON_CLK_VERSATILE
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	select GENERIC_CLOCKEVENTS
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	select GPIO_PL061 if GPIOLIB
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	select ICST
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	select NEED_MACH_MEMORY_H
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	select PLAT_VERSATILE
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	select PLAT_VERSATILE_SCHED_CLOCK
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	help
	  This enables support for ARM Ltd RealView boards.

config ARCH_VERSATILE
	bool "ARM Ltd. Versatile family"
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	select ARCH_WANT_OPTIONAL_GPIOLIB
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	select ARM_AMBA
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	select ARM_TIMER_SP804
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	select ARM_VIC
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	select CLKDEV_LOOKUP
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	select GENERIC_CLOCKEVENTS
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	select HAVE_MACH_CLKDEV
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	select ICST
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	select PLAT_VERSATILE
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	select PLAT_VERSATILE_CLOCK
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	select PLAT_VERSATILE_SCHED_CLOCK
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	select VERSATILE_FPGA_IRQ
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	help
	  This enables support for ARM Ltd Versatile board.

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config ARCH_CLPS711X
	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
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	select ARCH_REQUIRE_GPIOLIB
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	select AUTO_ZRELADDR
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	select CLKSRC_MMIO
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	select COMMON_CLK
	select CPU_ARM720T
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	select GENERIC_CLOCKEVENTS
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	select MFD_SYSCON
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	select SOC_BUS
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	help
	  Support for Cirrus Logic 711x/721x/731x based boards.

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config ARCH_GEMINI
	bool "Cortina Systems Gemini"
	select ARCH_REQUIRE_GPIOLIB
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	select CLKSRC_MMIO
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	select CPU_FA526
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	select GENERIC_CLOCKEVENTS
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	help
	  Support for the Cortina Systems Gemini family SoCs

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config ARCH_EBSA110
	bool "EBSA-110"
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	select ARCH_USES_GETTIMEOFFSET
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	select CPU_SA110
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	select ISA
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	select NEED_MACH_IO_H
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	select NEED_MACH_MEMORY_H
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	select NO_IOPORT_MAP
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	help
	  This is an evaluation board for the StrongARM processor available
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	  from Digital. It has limited hardware on-board, including an
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	  Ethernet interface, two PCMCIA sockets, two serial ports and a
	  parallel port.

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config ARCH_EP93XX
	bool "EP93xx-based"
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	select ARCH_HAS_HOLES_MEMORYMODEL
	select ARCH_REQUIRE_GPIOLIB
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	select ARM_AMBA
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	select ARM_PATCH_PHYS_VIRT
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	select ARM_VIC
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	select AUTO_ZRELADDR
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	select CLKDEV_LOOKUP
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	select CLKSRC_MMIO
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	select CPU_ARM920T
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	select GENERIC_CLOCKEVENTS
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	help
	  This enables support for the Cirrus EP93xx series of CPUs.

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config ARCH_FOOTBRIDGE
	bool "FootBridge"
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	select CPU_SA110
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	select FOOTBRIDGE
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	select GENERIC_CLOCKEVENTS
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	select HAVE_IDE
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	select NEED_MACH_IO_H if !MMU
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	select NEED_MACH_MEMORY_H
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	help
	  Support for systems based on the DC21285 companion chip
	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
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config ARCH_NETX
	bool "Hilscher NetX based"
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	select ARM_VIC
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	select CLKSRC_MMIO
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	select CPU_ARM926T
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	select GENERIC_CLOCKEVENTS
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	help
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	  This enables support for systems based on the Hilscher NetX Soc

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config ARCH_IOP13XX
	bool "IOP13xx-based"
	depends on MMU
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	select CPU_XSC3
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	select NEED_MACH_MEMORY_H
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	select NEED_RET_TO_USER
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	select PCI
	select PLAT_IOP
	select VMSPLIT_1G
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	select SPARSE_IRQ
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	help
	  Support for Intel's IOP13XX (XScale) family of processors.

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config ARCH_IOP32X
	bool "IOP32x-based"
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	depends on MMU
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_XSCALE
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	select GPIO_IOP
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	select NEED_RET_TO_USER
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	select PCI
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	select PLAT_IOP
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	help
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	  Support for Intel's 80219 and IOP32X (XScale) family of
	  processors.

config ARCH_IOP33X
	bool "IOP33x-based"
	depends on MMU
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_XSCALE
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	select GPIO_IOP
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	select NEED_RET_TO_USER
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	select PCI
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	select PLAT_IOP
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	help
	  Support for Intel's IOP33X (XScale) family of processors.
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config ARCH_IXP4XX
	bool "IXP4xx-based"
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	depends on MMU
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	select ARCH_HAS_DMA_SET_COHERENT_MASK
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	select ARCH_REQUIRE_GPIOLIB
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	select ARCH_SUPPORTS_BIG_ENDIAN
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	select CLKSRC_MMIO
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	select CPU_XSCALE
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	select DMABOUNCE if PCI
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	select GENERIC_CLOCKEVENTS
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	select MIGHT_HAVE_PCI
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	select NEED_MACH_IO_H
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	select USB_EHCI_BIG_ENDIAN_DESC
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	select USB_EHCI_BIG_ENDIAN_MMIO
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	help
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	  Support for Intel's IXP4XX (XScale) family of processors.
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config ARCH_DOVE
	bool "Marvell Dove"
	select ARCH_REQUIRE_GPIOLIB
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	select CPU_PJ4
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	select GENERIC_CLOCKEVENTS
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	select MIGHT_HAVE_PCI
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	select MVEBU_MBUS
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	select PINCTRL
	select PINCTRL_DOVE
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	select PLAT_ORION_LEGACY
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	help
	  Support for the Marvell Dove SoC 88AP510

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config ARCH_MV78XX0
	bool "Marvell MV78xx0"
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_FEROCEON
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	select GENERIC_CLOCKEVENTS
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	select MVEBU_MBUS
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	select PCI
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	select PLAT_ORION_LEGACY
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	help
	  Support for the following Marvell MV78xx0 series SoCs:
	  MV781x0, MV782x0.

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config ARCH_ORION5X
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	bool "Marvell Orion"
	depends on MMU
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	select ARCH_REQUIRE_GPIOLIB
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	select CPU_FEROCEON
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	select GENERIC_CLOCKEVENTS
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	select MVEBU_MBUS
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	select PCI
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	select PLAT_ORION_LEGACY
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	select MULTI_IRQ_HANDLER
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	help
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	  Support for the following Marvell Orion 5x series SoCs:
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	  Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
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	  Orion-2 (5281), Orion-1-90 (6183).
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config ARCH_KS8695
	bool "Micrel/Kendin KS8695"
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	select ARCH_REQUIRE_GPIOLIB
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	select CLKSRC_MMIO
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	select CPU_ARM922T
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	select GENERIC_CLOCKEVENTS
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	select NEED_MACH_MEMORY_H
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	help
	  Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
	  System-on-Chip devices.

config ARCH_W90X900
	bool "Nuvoton W90X900 CPU"
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	select ARCH_REQUIRE_GPIOLIB
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	select CLKDEV_LOOKUP
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	select CLKSRC_MMIO
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	select CPU_ARM926T
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	select GENERIC_CLOCKEVENTS
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	help
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	  Support for Nuvoton (Winbond logic dept.) ARM9 processor,
	  At present, the w90x900 has been renamed nuc900, regarding
	  the ARM series product line, you can login the following
	  link address to know more.

	  <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
		ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
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config ARCH_LPC32XX
	bool "NXP LPC32XX"
	select ARCH_REQUIRE_GPIOLIB
	select ARM_AMBA
	select CLKDEV_LOOKUP
	select CLKSRC_MMIO
	select CPU_ARM926T
	select GENERIC_CLOCKEVENTS
	select HAVE_IDE
	select USE_OF
	help
	  Support for the NXP LPC32XX family of processors

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config ARCH_PXA
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	bool "PXA2xx/PXA3xx-based"
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	depends on MMU
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	select ARCH_MTD_XIP
	select ARCH_REQUIRE_GPIOLIB
	select ARM_CPU_SUSPEND if PM
	select AUTO_ZRELADDR
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	select COMMON_CLK
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	select CLKDEV_LOOKUP
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	select CLKSRC_MMIO
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	select CLKSRC_OF
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	select GENERIC_CLOCKEVENTS
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	select GPIO_PXA
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	select HAVE_IDE
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	select IRQ_DOMAIN
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	select MULTI_IRQ_HANDLER
	select PLAT_PXA
	select SPARSE_IRQ
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	help
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	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
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config ARCH_RPC
	bool "RiscPC"
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612
	depends on MMU
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613
	select ARCH_ACORN
614
	select ARCH_MAY_HAVE_PC_FDC
615
	select ARCH_SPARSEMEM_ENABLE
616
	select ARCH_USES_GETTIMEOFFSET
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	select CPU_SA110
618
	select FIQ
619
	select HAVE_IDE
620 621
	select HAVE_PATA_PLATFORM
	select ISA_DMA_API
622
	select NEED_MACH_IO_H
623
	select NEED_MACH_MEMORY_H
624
	select NO_IOPORT_MAP
625
	select VIRT_TO_BUS
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	help
	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
	  CD-ROM interface, serial and parallel port, and the floppy drive.

config ARCH_SA1100
	bool "SA1100-based"
632 633 634 635 636
	select ARCH_MTD_XIP
	select ARCH_REQUIRE_GPIOLIB
	select ARCH_SPARSEMEM_ENABLE
	select CLKDEV_LOOKUP
	select CLKSRC_MMIO
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	select CPU_FREQ
638
	select CPU_SA1100
639
	select GENERIC_CLOCKEVENTS
640
	select HAVE_IDE
641
	select IRQ_DOMAIN
642
	select ISA
643
	select MULTI_IRQ_HANDLER
644
	select NEED_MACH_MEMORY_H
645
	select SPARSE_IRQ
646 647
	help
	  Support for StrongARM 11x0 based boards.
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649 650
config ARCH_S3C24XX
	bool "Samsung S3C24XX SoCs"
651
	select ARCH_REQUIRE_GPIOLIB
652
	select ATAGS
653
	select CLKDEV_LOOKUP
654
	select CLKSRC_SAMSUNG_PWM
655
	select GENERIC_CLOCKEVENTS
656
	select GPIO_SAMSUNG
657
	select HAVE_S3C2410_I2C if I2C
658
	select HAVE_S3C2410_WATCHDOG if WATCHDOG
659
	select HAVE_S3C_RTC if RTC_CLASS
660
	select MULTI_IRQ_HANDLER
661
	select NEED_MACH_IO_H
662
	select SAMSUNG_ATAGS
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	help
664 665 666 667
	  Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
	  and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
	  (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
	  Samsung SMDK2410 development board (and derivatives).
668

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config ARCH_S3C64XX
	bool "Samsung S3C64XX"
671
	select ARCH_REQUIRE_GPIOLIB
672
	select ARM_AMBA
673
	select ARM_VIC
674
	select ATAGS
675
	select CLKDEV_LOOKUP
676
	select CLKSRC_SAMSUNG_PWM
677
	select COMMON_CLK_SAMSUNG
678
	select CPU_V6K
679
	select GENERIC_CLOCKEVENTS
680
	select GPIO_SAMSUNG
681 682
	select HAVE_S3C2410_I2C if I2C
	select HAVE_S3C2410_WATCHDOG if WATCHDOG
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	select HAVE_TCM
684
	select NO_IOPORT_MAP
685
	select PLAT_SAMSUNG
686
	select PM_GENERIC_DOMAINS if PM
687 688
	select S3C_DEV_NAND
	select S3C_GPIO_TRACK
689
	select SAMSUNG_ATAGS
690
	select SAMSUNG_WAKEMASK
691
	select SAMSUNG_WDT_RESET
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	help
	  Samsung S3C64XX series based systems

695 696
config ARCH_DAVINCI
	bool "TI DaVinci"
697
	select ARCH_HAS_HOLES_MEMORYMODEL
698
	select ARCH_REQUIRE_GPIOLIB
699
	select CLKDEV_LOOKUP
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	select GENERIC_ALLOCATOR
701
	select GENERIC_CLOCKEVENTS
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	select GENERIC_IRQ_CHIP
703
	select HAVE_IDE
704
	select USE_OF
705
	select ZONE_DMA
706 707 708
	help
	  Support for TI's DaVinci platform.

709 710
config ARCH_OMAP1
	bool "TI OMAP1"
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	depends on MMU
712
	select ARCH_HAS_HOLES_MEMORYMODEL
713
	select ARCH_OMAP
714
	select ARCH_REQUIRE_GPIOLIB
715
	select CLKDEV_LOOKUP
716
	select CLKSRC_MMIO
717
	select GENERIC_CLOCKEVENTS
718 719 720
	select GENERIC_IRQ_CHIP
	select HAVE_IDE
	select IRQ_DOMAIN
721
	select MULTI_IRQ_HANDLER
722 723
	select NEED_MACH_IO_H if PCCARD
	select NEED_MACH_MEMORY_H
724
	select SPARSE_IRQ
725
	help
726
	  Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
727

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endchoice

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menu "Multiple platform selection"
	depends on ARCH_MULTIPLATFORM

comment "CPU Core family selection"

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config ARCH_MULTI_V4
	bool "ARMv4 based platforms (FA526)"
	depends on !ARCH_MULTI_V6_V7
	select ARCH_MULTI_V4_V5
	select CPU_FA526

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config ARCH_MULTI_V4T
	bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
	depends on !ARCH_MULTI_V6_V7
744
	select ARCH_MULTI_V4_V5
745 746 747
	select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
		CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
		CPU_ARM925T || CPU_ARM940T)
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config ARCH_MULTI_V5
	bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
	depends on !ARCH_MULTI_V6_V7
752
	select ARCH_MULTI_V4_V5
753
	select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
754 755
		CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
		CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
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config ARCH_MULTI_V4_V5
	bool

config ARCH_MULTI_V6
761
	bool "ARMv6 based platforms (ARM11)"
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762
	select ARCH_MULTI_V6_V7
763
	select CPU_V6K
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764 765

config ARCH_MULTI_V7
766
	bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
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	default y
	select ARCH_MULTI_V6_V7
769
	select CPU_V7
770
	select HAVE_SMP
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771 772 773

config ARCH_MULTI_V6_V7
	bool
774
	select MIGHT_HAVE_CACHE_L2X0
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config ARCH_MULTI_CPU_AUTO
	def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
	select ARCH_MULTI_V5

endmenu

782 783
config ARCH_VIRT
	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
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784
	select ARM_AMBA
785
	select ARM_GIC
786
	select ARM_GIC_V3
787
	select ARM_PSCI
R
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788
	select HAVE_ARM_ARCH_TIMER
789

790 791 792 793 794
#
# This is sorted alphabetically by mach-* pathname.  However, plat-*
# Kconfigs may be included either alphabetically (according to the
# plat- suffix) or along side the corresponding mach-* source.
#
795 796
source "arch/arm/mach-mvebu/Kconfig"

797 798
source "arch/arm/mach-alpine/Kconfig"

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source "arch/arm/mach-asm9260/Kconfig"

801 802
source "arch/arm/mach-at91/Kconfig"

803 804
source "arch/arm/mach-axxia/Kconfig"

805 806
source "arch/arm/mach-bcm/Kconfig"

807 808
source "arch/arm/mach-berlin/Kconfig"

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809 810
source "arch/arm/mach-clps711x/Kconfig"

811 812
source "arch/arm/mach-cns3xxx/Kconfig"

813 814
source "arch/arm/mach-davinci/Kconfig"

815 816
source "arch/arm/mach-digicolor/Kconfig"

817 818
source "arch/arm/mach-dove/Kconfig"

819 820
source "arch/arm/mach-ep93xx/Kconfig"

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821 822
source "arch/arm/mach-footbridge/Kconfig"

823 824
source "arch/arm/mach-gemini/Kconfig"

R
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825 826
source "arch/arm/mach-highbank/Kconfig"

H
Haojian Zhuang 已提交
827 828
source "arch/arm/mach-hisi/Kconfig"

L
Linus Torvalds 已提交
829 830
source "arch/arm/mach-integrator/Kconfig"

831 832 833
source "arch/arm/mach-iop32x/Kconfig"

source "arch/arm/mach-iop33x/Kconfig"
L
Linus Torvalds 已提交
834

835 836
source "arch/arm/mach-iop13xx/Kconfig"

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837 838
source "arch/arm/mach-ixp4xx/Kconfig"

839 840
source "arch/arm/mach-keystone/Kconfig"

841 842
source "arch/arm/mach-ks8695/Kconfig"

843 844
source "arch/arm/mach-meson/Kconfig"

845 846
source "arch/arm/mach-moxart/Kconfig"

847 848
source "arch/arm/mach-mv78xx0/Kconfig"

S
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849
source "arch/arm/mach-imx/Kconfig"
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850

851 852
source "arch/arm/mach-mediatek/Kconfig"

853 854
source "arch/arm/mach-mxs/Kconfig"

855
source "arch/arm/mach-netx/Kconfig"
856

857 858
source "arch/arm/mach-nomadik/Kconfig"

D
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859 860
source "arch/arm/mach-nspire/Kconfig"

861 862 863
source "arch/arm/plat-omap/Kconfig"

source "arch/arm/mach-omap1/Kconfig"
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865 866
source "arch/arm/mach-omap2/Kconfig"

867
source "arch/arm/mach-orion5x/Kconfig"
868

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869 870
source "arch/arm/mach-picoxcell/Kconfig"

871 872
source "arch/arm/mach-pxa/Kconfig"
source "arch/arm/plat-pxa/Kconfig"
873

874 875
source "arch/arm/mach-mmp/Kconfig"

876 877
source "arch/arm/mach-qcom/Kconfig"

878 879
source "arch/arm/mach-realview/Kconfig"

880 881
source "arch/arm/mach-rockchip/Kconfig"

882
source "arch/arm/mach-sa1100/Kconfig"
883

R
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884 885
source "arch/arm/mach-socfpga/Kconfig"

886
source "arch/arm/mach-spear/Kconfig"
887

888 889
source "arch/arm/mach-sti/Kconfig"

890
source "arch/arm/mach-s3c24xx/Kconfig"
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Linus Torvalds 已提交
891

892
source "arch/arm/mach-s3c64xx/Kconfig"
B
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893

894 895
source "arch/arm/mach-s5pv210/Kconfig"

896
source "arch/arm/mach-exynos/Kconfig"
897
source "arch/arm/plat-samsung/Kconfig"
898

899
source "arch/arm/mach-shmobile/Kconfig"
900

901 902
source "arch/arm/mach-sunxi/Kconfig"

903 904
source "arch/arm/mach-prima2/Kconfig"

905 906
source "arch/arm/mach-tegra/Kconfig"

907
source "arch/arm/mach-u300/Kconfig"
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908

909 910
source "arch/arm/mach-uniphier/Kconfig"

911
source "arch/arm/mach-ux500/Kconfig"
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source "arch/arm/mach-versatile/Kconfig"

915
source "arch/arm/mach-vexpress/Kconfig"
916
source "arch/arm/plat-versatile/Kconfig"
917

918 919
source "arch/arm/mach-vt8500/Kconfig"

920 921
source "arch/arm/mach-w90x900/Kconfig"

922 923
source "arch/arm/mach-zx/Kconfig"

924 925
source "arch/arm/mach-zynq/Kconfig"

926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
# ARMv7-M architecture
config ARCH_EFM32
	bool "Energy Micro efm32"
	depends on ARM_SINGLE_ARMV7M
	select ARCH_REQUIRE_GPIOLIB
	help
	  Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
	  processors.

config ARCH_LPC18XX
	bool "NXP LPC18xx/LPC43xx"
	depends on ARM_SINGLE_ARMV7M
	select ARCH_HAS_RESET_CONTROLLER
	select ARM_AMBA
	select CLKSRC_LPC32XX
	select PINCTRL
	help
	  Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
	  high performance microcontrollers.

config ARCH_STM32
	bool "STMicrolectronics STM32"
	depends on ARM_SINGLE_ARMV7M
	select ARCH_HAS_RESET_CONTROLLER
	select ARMV7M_SYSTICK
951
	select CLKSRC_STM32
952 953 954 955
	select RESET_CONTROLLER
	help
	  Support for STMicroelectronics STM32 processors.

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956 957 958 959
# Definitions to make life easier
config ARCH_ACORN
	bool

960 961
config PLAT_IOP
	bool
M
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962
	select GENERIC_CLOCKEVENTS
963

L
Lennert Buytenhek 已提交
964 965
config PLAT_ORION
	bool
966
	select CLKSRC_MMIO
967
	select COMMON_CLK
R
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968
	select GENERIC_IRQ_CHIP
969
	select IRQ_DOMAIN
L
Lennert Buytenhek 已提交
970

971 972 973 974
config PLAT_ORION_LEGACY
	bool
	select PLAT_ORION

975 976 977
config PLAT_PXA
	bool

978 979 980
config PLAT_VERSATILE
	bool

981 982
source "arch/arm/firmware/Kconfig"

L
Linus Torvalds 已提交
983 984
source arch/arm/mm/Kconfig

985
config IWMMXT
986 987 988
	bool "Enable iWMMXt support"
	depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
	default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
989 990 991 992
	help
	  Enable support for iWMMXt context switching at run time if
	  running on a CPU that supports it.

993 994 995 996 997
config MULTI_IRQ_HANDLER
	bool
	help
	  Allow each machine to specify it's own IRQ handler at run time.

998 999 1000 1001
if !MMU
source "arch/arm/Kconfig-nommu"
endif

1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
config PJ4B_ERRATA_4742
	bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
	depends on CPU_PJ4B && MACH_ARMADA_370
	default y
	help
	  When coming out of either a Wait for Interrupt (WFI) or a Wait for
	  Event (WFE) IDLE states, a specific timing sensitivity exists between
	  the retiring WFI/WFE instructions and the newly issued subsequent
	  instructions.  This sensitivity can result in a CPU hang scenario.
	  Workaround:
	  The software must insert either a Data Synchronization Barrier (DSB)
	  or Data Memory Barrier (DMB) command immediately after the WFI/WFE
	  instruction

1016 1017 1018 1019 1020 1021 1022 1023 1024
config ARM_ERRATA_326103
	bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
	depends on CPU_V6
	help
	  Executing a SWP instruction to read-only memory does not set bit 11
	  of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
	  treat the access as a read, preventing a COW from occurring and
	  causing the faulting task to livelock.

1025 1026
config ARM_ERRATA_411920
	bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1027
	depends on CPU_V6 || CPU_V6K
1028 1029 1030 1031 1032 1033
	help
	  Invalidation of the Instruction Cache operation can
	  fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
	  It does not affect the MPCore. This option enables the ARM Ltd.
	  recommended workaround.

1034 1035 1036 1037 1038
config ARM_ERRATA_430973
	bool "ARM errata: Stale prediction on replaced interworking branch"
	depends on CPU_V7
	help
	  This option enables the workaround for the 430973 Cortex-A8
1039
	  r1p* erratum. If a code sequence containing an ARM/Thumb
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
	  interworking branch is replaced with another code sequence at the
	  same virtual address, whether due to self-modifying code or virtual
	  to physical address re-mapping, Cortex-A8 does not recover from the
	  stale interworking branch prediction. This results in Cortex-A8
	  executing the new code sequence in the incorrect ARM or Thumb state.
	  The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
	  and also flushes the branch target cache at every context switch.
	  Note that setting specific bits in the ACTLR register may not be
	  available in non-secure mode.

1050 1051 1052
config ARM_ERRATA_458693
	bool "ARM errata: Processor deadlock when a false hazard is created"
	depends on CPU_V7
1053
	depends on !ARCH_MULTIPLATFORM
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
	help
	  This option enables the workaround for the 458693 Cortex-A8 (r2p0)
	  erratum. For very specific sequences of memory operations, it is
	  possible for a hazard condition intended for a cache line to instead
	  be incorrectly associated with a different cache line. This false
	  hazard might then cause a processor deadlock. The workaround enables
	  the L1 caching of the NEON accesses and disables the PLD instruction
	  in the ACTLR register. Note that setting specific bits in the ACTLR
	  register may not be available in non-secure mode.

1064 1065 1066
config ARM_ERRATA_460075
	bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
	depends on CPU_V7
1067
	depends on !ARCH_MULTIPLATFORM
1068 1069 1070 1071 1072 1073 1074 1075 1076
	help
	  This option enables the workaround for the 460075 Cortex-A8 (r2p0)
	  erratum. Any asynchronous access to the L2 cache may encounter a
	  situation in which recent store transactions to the L2 cache are lost
	  and overwritten with stale memory contents from external memory. The
	  workaround disables the write-allocate mode for the L2 cache via the
	  ACTLR register. Note that setting specific bits in the ACTLR register
	  may not be available in non-secure mode.

1077 1078 1079
config ARM_ERRATA_742230
	bool "ARM errata: DMB operation may be faulty"
	depends on CPU_V7 && SMP
1080
	depends on !ARCH_MULTIPLATFORM
1081 1082 1083 1084 1085 1086 1087 1088 1089
	help
	  This option enables the workaround for the 742230 Cortex-A9
	  (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
	  between two write operations may not ensure the correct visibility
	  ordering of the two writes. This workaround sets a specific bit in
	  the diagnostic register of the Cortex-A9 which causes the DMB
	  instruction to behave as a DSB, ensuring the correct behaviour of
	  the two writes.

1090 1091 1092
config ARM_ERRATA_742231
	bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
	depends on CPU_V7 && SMP
1093
	depends on !ARCH_MULTIPLATFORM
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
	help
	  This option enables the workaround for the 742231 Cortex-A9
	  (r2p0..r2p2) erratum. Under certain conditions, specific to the
	  Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
	  accessing some data located in the same cache line, may get corrupted
	  data due to bad handling of the address hazard when the line gets
	  replaced from one of the CPUs at the same time as another CPU is
	  accessing it. This workaround sets specific bits in the diagnostic
	  register of the Cortex-A9 which reduces the linefill issuing
	  capabilities of the processor.

1105 1106 1107
config ARM_ERRATA_643719
	bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
	depends on CPU_V7 && SMP
1108
	default y
1109 1110 1111 1112 1113 1114 1115
	help
	  This option enables the workaround for the 643719 Cortex-A9 (prior to
	  r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
	  register returns zero when it should return one. The workaround
	  corrects this value, ensuring cache maintenance operations which use
	  it behave as intended and avoiding data corruption.

1116 1117
config ARM_ERRATA_720789
	bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1118
	depends on CPU_V7
1119 1120 1121 1122 1123 1124 1125 1126
	help
	  This option enables the workaround for the 720789 Cortex-A9 (prior to
	  r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
	  broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
	  As a consequence of this erratum, some TLB entries which should be
	  invalidated are not, resulting in an incoherency in the system page
	  tables. The workaround changes the TLB flushing routines to invalidate
	  entries regardless of the ASID.
1127 1128 1129 1130

config ARM_ERRATA_743622
	bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
	depends on CPU_V7
1131
	depends on !ARCH_MULTIPLATFORM
1132 1133
	help
	  This option enables the workaround for the 743622 Cortex-A9
1134
	  (r2p*) erratum. Under very rare conditions, a faulty
1135 1136 1137 1138 1139 1140 1141
	  optimisation in the Cortex-A9 Store Buffer may lead to data
	  corruption. This workaround sets a specific bit in the diagnostic
	  register of the Cortex-A9 which disables the Store Buffer
	  optimisation, preventing the defect from occurring. This has no
	  visible impact on the overall performance or power consumption of the
	  processor.

1142 1143
config ARM_ERRATA_751472
	bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
1144
	depends on CPU_V7
1145
	depends on !ARCH_MULTIPLATFORM
1146 1147 1148 1149 1150 1151 1152
	help
	  This option enables the workaround for the 751472 Cortex-A9 (prior
	  to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
	  completion of a following broadcasted operation if the second
	  operation is received by a CPU before the ICIALLUIS has completed,
	  potentially leading to corrupted entries in the cache or TLB.

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config ARM_ERRATA_754322
	bool "ARM errata: possible faulty MMU translations following an ASID switch"
	depends on CPU_V7
	help
	  This option enables the workaround for the 754322 Cortex-A9 (r2p*,
	  r3p*) erratum. A speculative memory access may cause a page table walk
	  which starts prior to an ASID switch but completes afterwards. This
	  can populate the micro-TLB with a stale entry which may be hit with
	  the new ASID. This workaround places two dsb instructions in the mm
	  switching code so that no page table walks can cross the ASID switch.

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config ARM_ERRATA_754327
	bool "ARM errata: no automatic Store Buffer drain"
	depends on CPU_V7 && SMP
	help
	  This option enables the workaround for the 754327 Cortex-A9 (prior to
	  r2p0) erratum. The Store Buffer does not have any automatic draining
	  mechanism and therefore a livelock may occur if an external agent
	  continuously polls a memory location waiting to observe an update.
	  This workaround defines cpu_relax() as smp_mb(), preventing correctly
	  written polling loops from denying visibility of updates to memory.

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config ARM_ERRATA_364296
	bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
1177
	depends on CPU_V6
1178 1179 1180 1181 1182 1183 1184 1185 1186
	help
	  This options enables the workaround for the 364296 ARM1136
	  r0p2 erratum (possible cache data corruption with
	  hit-under-miss enabled). It sets the undocumented bit 31 in
	  the auxiliary control register and the FI bit in the control
	  register, thus disabling hit-under-miss without putting the
	  processor into full low interrupt latency mode. ARM11MPCore
	  is not affected.

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config ARM_ERRATA_764369
	bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
	depends on CPU_V7 && SMP
	help
	  This option enables the workaround for erratum 764369
	  affecting Cortex-A9 MPCore with two or more processors (all
	  current revisions). Under certain timing circumstances, a data
	  cache line maintenance operation by MVA targeting an Inner
	  Shareable memory region may fail to proceed up to either the
	  Point of Coherency or to the Point of Unification of the
	  system. This workaround adds a DSB instruction before the
	  relevant cache maintenance functions and sets a specific bit
	  in the diagnostic control register of the SCU.

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config ARM_ERRATA_775420
       bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
       depends on CPU_V7
       help
	 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
	 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
	 operation aborts with MMU exception, it might cause the processor
	 to deadlock. This workaround puts DSB before executing ISB if
	 an abort may occur on cache maintenance.

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config ARM_ERRATA_798181
	bool "ARM errata: TLBI/DSB failure on Cortex-A15"
	depends on CPU_V7 && SMP
	help
	  On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
	  adequately shooting down all use of the old entries. This
	  option enables the Linux kernel workaround for this erratum
	  which sends an IPI to the CPUs that are running the same ASID
	  as the one being invalidated.

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config ARM_ERRATA_773022
	bool "ARM errata: incorrect instructions may be executed from loop buffer"
	depends on CPU_V7
	help
	  This option enables the workaround for the 773022 Cortex-A15
	  (up to r0p4) erratum. In certain rare sequences of code, the
	  loop buffer may deliver incorrect instructions. This
	  workaround disables the loop buffer to avoid the erratum.

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endmenu

source "arch/arm/common/Kconfig"

menu "Bus support"

config ISA
	bool
	help
	  Find out whether you have ISA slots on your motherboard.  ISA is the
	  name of a bus system, i.e. the way the CPU talks to the other stuff
	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
	  newer boards don't support it.  If you have ISA, say Y, otherwise N.

1245
# Select ISA DMA controller support
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config ISA_DMA
	bool
1248
	select ISA_DMA_API
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1250
# Select ISA DMA interface
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config ISA_DMA_API
	bool

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config PCI
1255
	bool "PCI support" if MIGHT_HAVE_PCI
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	help
	  Find out whether you have a PCI motherboard. PCI is the name of a
	  bus system, i.e. the way the CPU talks to the other stuff inside
	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
	  VESA. If you have PCI, say Y, otherwise N.

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config PCI_DOMAINS
	bool
	depends on PCI

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config PCI_DOMAINS_GENERIC
	def_bool PCI_DOMAINS

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config PCI_NANOENGINE
	bool "BSE nanoEngine PCI support"
	depends on SA1100_NANOENGINE
	help
	  Enable PCI on the BSE nanoEngine board.

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config PCI_SYSCALL
	def_bool PCI

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config PCI_HOST_ITE8152
	bool
	depends on PCI && MACH_ARMCORE
	default y
	select DMABOUNCE

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source "drivers/pci/Kconfig"
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source "drivers/pci/pcie/Kconfig"
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source "drivers/pcmcia/Kconfig"

endmenu

menu "Kernel Features"

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config HAVE_SMP
	bool
	help
	  This option should be selected by machines which have an SMP-
	  capable CPU.

	  The only effect of this option is to make the SMP-related
	  options available to the user for configuration.

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config SMP
1303
	bool "Symmetric Multi-Processing"
1304
	depends on CPU_V6K || CPU_V7
1305
	depends on GENERIC_CLOCKEVENTS
1306
	depends on HAVE_SMP
1307
	depends on MMU || ARM_MPU
1308
	select IRQ_WORK
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	help
	  This enables support for systems with more than one CPU. If you have
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	  a system with only one CPU, say N. If you have a system with more
	  than one CPU, say Y.
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	  If you say N here, the kernel will run on uni- and multiprocessor
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	  machines, but will use only one CPU of a multiprocessor machine. If
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	  you say Y here, the kernel will run on many, but not all,
	  uniprocessor machines. On a uniprocessor machine, the kernel
	  will run faster if you say N here.
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	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
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	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1322
	  <http://tldp.org/HOWTO/SMP-HOWTO.html>.
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	  If you don't know what to do here, say N.

1326
config SMP_ON_UP
1327
	bool "Allow booting SMP kernel on uniprocessor systems"
1328
	depends on SMP && !XIP_KERNEL && MMU
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	default y
	help
	  SMP kernels contain instructions which fail on non-SMP processors.
	  Enabling this option allows the kernel to modify itself to make
	  these instructions safe.  Disabling it allows about 1K of space
	  savings.

	  If you don't know what to do here, say Y.

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config ARM_CPU_TOPOLOGY
	bool "Support cpu topology definition"
	depends on SMP && CPU_V7
	default y
	help
	  Support ARM cpu topology definition. The MPIDR register defines
	  affinity between processors which is then used to describe the cpu
	  topology of an ARM System.

config SCHED_MC
	bool "Multi-core scheduler support"
	depends on ARM_CPU_TOPOLOGY
	help
	  Multi-core scheduler support improves the CPU scheduler's decision
	  making when dealing with multi-core CPU chips at a cost of slightly
	  increased overhead in some places. If unsure say N here.

config SCHED_SMT
	bool "SMT scheduler support"
	depends on ARM_CPU_TOPOLOGY
	help
	  Improves the CPU scheduler's decision making when dealing with
	  MultiThreading at a cost of slightly increased overhead in some
	  places. If unsure say N here.

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config HAVE_ARM_SCU
	bool
	help
	  This option enables support for the ARM system coherency unit

1368
config HAVE_ARM_ARCH_TIMER
1369 1370
	bool "Architected timer support"
	depends on CPU_V7
1371
	select ARM_ARCH_TIMER
1372
	select GENERIC_CLOCKEVENTS
1373 1374 1375
	help
	  This option enables support for the ARM architected timer

1376 1377
config HAVE_ARM_TWD
	bool
1378
	select CLKSRC_OF if OF
1379 1380 1381
	help
	  This options enables support for the ARM timer and watchdog unit

1382 1383 1384 1385 1386 1387 1388 1389
config MCPM
	bool "Multi-Cluster Power Management"
	depends on CPU_V7 && SMP
	help
	  This option provides the common power management infrastructure
	  for (multi-)cluster based systems, such as big.LITTLE based
	  systems.

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config MCPM_QUAD_CLUSTER
	bool
	depends on MCPM
	help
	  To avoid wasting resources unnecessarily, MCPM only supports up
	  to 2 clusters by default.
	  Platforms with 3 or 4 clusters that use MCPM must select this
	  option to allow the additional clusters to be managed.

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config BIG_LITTLE
	bool "big.LITTLE support (Experimental)"
	depends on CPU_V7 && SMP
	select MCPM
	help
	  This option enables support selections for the big.LITTLE
	  system architecture.

config BL_SWITCHER
	bool "big.LITTLE switcher support"
	depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
	select ARM_CPU_SUSPEND
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	select CPU_PM
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	help
	  The big.LITTLE "switcher" provides the core functionality to
	  transparently handle transition between a cluster of A15's
	  and a cluster of A7's in a big.LITTLE system.

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config BL_SWITCHER_DUMMY_IF
	tristate "Simple big.LITTLE switcher user interface"
	depends on BL_SWITCHER && DEBUG_KERNEL
	help
	  This is a simple and dummy char dev interface to control
	  the big.LITTLE switcher core code.  It is meant for
	  debugging purposes only.

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choice
	prompt "Memory split"
1427
	depends on MMU
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	default VMSPLIT_3G
	help
	  Select the desired split between kernel and user memory.

	  If you are not absolutely sure what you are doing, leave this
	  option alone!

	config VMSPLIT_3G
		bool "3G/1G user/kernel split"
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	config VMSPLIT_3G_OPT
		bool "3G/1G user/kernel split (for full 1G low memory)"
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	config VMSPLIT_2G
		bool "2G/2G user/kernel split"
	config VMSPLIT_1G
		bool "1G/3G user/kernel split"
endchoice

config PAGE_OFFSET
	hex
1447
	default PHYS_OFFSET if !MMU
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	default 0x40000000 if VMSPLIT_1G
	default 0x80000000 if VMSPLIT_2G
1450
	default 0xB0000000 if VMSPLIT_3G_OPT
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	default 0xC0000000

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config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "4"

1459
config HOTPLUG_CPU
1460
	bool "Support for hot-pluggable CPUs"
1461
	depends on SMP
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	help
	  Say Y here to experiment with turning CPUs off and on.  CPUs
	  can be controlled through /sys/devices/system/cpu.

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config ARM_PSCI
	bool "Support for the ARM Power State Coordination Interface (PSCI)"
	depends on CPU_V7
1469
	select ARM_PSCI_FW
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	help
	  Say Y here if you want Linux to communicate with system firmware
	  implementing the PSCI specification for CPU-centric power
	  management operations described in ARM document number ARM DEN
	  0022A ("Power State Coordination Interface System Software on
	  ARM processors").

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# The GPIO number here must be sorted by descending number. In case of
# a multiplatform kernel, we just want the highest value required by the
# selected platforms.
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config ARCH_NR_GPIO
	int
1482 1483
	default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
		ARCH_ZYNQ
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	default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
		SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
1486
	default 416 if ARCH_SUNXI
1487
	default 392 if ARCH_U8500
1488
	default 352 if ARCH_VT8500
1489
	default 288 if ARCH_ROCKCHIP
1490
	default 264 if MACH_H4700
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	default 0
	help
	  Maximum number of GPIOs in the system.

	  If unsure, leave the default value.

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source kernel/Kconfig.preempt
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config HZ_FIXED
1500
	int
1501
	default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
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		ARCH_S5PV210 || ARCH_EXYNOS4
1503
	default 128 if SOC_AT91RM9200
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	default 0
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choice
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	depends on HZ_FIXED = 0
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	prompt "Timer frequency"

config HZ_100
	bool "100 Hz"

config HZ_200
	bool "200 Hz"

config HZ_250
	bool "250 Hz"

config HZ_300
	bool "300 Hz"

config HZ_500
	bool "500 Hz"

config HZ_1000
	bool "1000 Hz"

endchoice

config HZ
	int
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	default HZ_FIXED if HZ_FIXED != 0
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	default 100 if HZ_100
	default 200 if HZ_200
	default 250 if HZ_250
	default 300 if HZ_300
	default 500 if HZ_500
	default 1000

config SCHED_HRTICK
	def_bool HIGH_RES_TIMERS
1542

1543
config THUMB2_KERNEL
1544
	bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
1545
	depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
1546
	default y if CPU_THUMBONLY
1547 1548
	select AEABI
	select ARM_ASM_UNIFIED
1549
	select ARM_UNWIND
1550 1551 1552 1553 1554 1555 1556
	help
	  By enabling this option, the kernel will be compiled in
	  Thumb-2 mode. A compiler/assembler that understand the unified
	  ARM-Thumb syntax is needed.

	  If unsure, say N.

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config THUMB2_AVOID_R_ARM_THM_JUMP11
	bool "Work around buggy Thumb-2 short branch relocations in gas"
	depends on THUMB2_KERNEL && MODULES
	default y
	help
	  Various binutils versions can resolve Thumb-2 branches to
	  locally-defined, preemptible global symbols as short-range "b.n"
	  branch instructions.

	  This is a problem, because there's no guarantee the final
	  destination of the symbol, or any candidate locations for a
	  trampoline, are within range of the branch.  For this reason, the
	  kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
	  relocation in modules at all, and it makes little sense to add
	  support.

	  The symptom is that the kernel fails with an "unsupported
	  relocation" error when loading some modules.

	  Until fixed tools are available, passing
	  -fno-optimize-sibling-calls to gcc should prevent gcc generating
	  code which hits this problem, at the cost of a bit of extra runtime
	  stack usage in some cases.

	  The problem is described in more detail at:
	      https://bugs.launchpad.net/binutils-linaro/+bug/725126

	  Only Thumb-2 kernels are affected.

	  Unless you are sure your tools don't have this problem, say Y.

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config ARM_ASM_UNIFIED
	bool

1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605
config AEABI
	bool "Use the ARM EABI to compile the kernel"
	help
	  This option allows for the kernel to be compiled using the latest
	  ARM ABI (aka EABI).  This is only useful if you are using a user
	  space environment that is also compiled with EABI.

	  Since there are major incompatibilities between the legacy ABI and
	  EABI, especially with regard to structure member alignment, this
	  option also changes the kernel syscall calling convention to
	  disambiguate both ABIs and allow for backward compatibility support
	  (selected with CONFIG_OABI_COMPAT).

	  To use this you need GCC version 4.0.0 or later.

1606
config OABI_COMPAT
1607
	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1608
	depends on AEABI && !THUMB2_KERNEL
1609 1610 1611 1612 1613 1614 1615
	help
	  This option preserves the old syscall interface along with the
	  new (ARM EABI) one. It also provides a compatibility layer to
	  intercept syscalls that have structure arguments which layout
	  in memory differs between the legacy ABI and the new ARM EABI
	  (only for non "thumb" binaries). This option adds a tiny
	  overhead to all syscalls and produces a slightly larger kernel.
1616 1617 1618 1619 1620

	  The seccomp filter system will not be available when this is
	  selected, since there is no way yet to sensibly distinguish
	  between calling conventions during filtering.

1621 1622 1623 1624
	  If you know you'll be using only pure EABI user space then you
	  can say N here. If this option is not selected and you attempt
	  to execute a legacy ABI binary then the result will be
	  UNPREDICTABLE (in fact it can be predicted that it won't work
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	  at all). If in doubt say N.
1626

1627
config ARCH_HAS_HOLES_MEMORYMODEL
1628 1629
	bool

1630 1631 1632
config ARCH_SPARSEMEM_ENABLE
	bool

1633 1634 1635
config ARCH_SPARSEMEM_DEFAULT
	def_bool ARCH_SPARSEMEM_ENABLE

1636
config ARCH_SELECT_MEMORY_MODEL
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	def_bool ARCH_SPARSEMEM_ENABLE
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1639 1640 1641
config HAVE_ARCH_PFN_VALID
	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM

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config HAVE_GENERIC_RCU_GUP
	def_bool y
	depends on ARM_LPAE

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config HIGHMEM
1647 1648
	bool "High Memory Support"
	depends on MMU
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	help
	  The address space of ARM processors is only 4 Gigabytes large
	  and it has to accommodate user address space, kernel address
	  space as well as some memory mapped IO. That means that, if you
	  have a large amount of physical memory and/or IO, not all of the
	  memory can be "permanently mapped" by the kernel. The physical
	  memory that is not permanently mapped is called "high memory".

	  Depending on the selected kernel/user memory split, minimum
	  vmalloc space and actual amount of RAM, you may not need this
	  option which should result in a slightly faster kernel.

	  If unsure, say n.

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config HIGHPTE
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	bool "Allocate 2nd-level pagetables from highmem" if EXPERT
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	depends on HIGHMEM
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	default y
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	help
	  The VM uses one page of physical memory for each page table.
	  For systems with a lot of processes, this can use a lot of
	  precious low memory, eventually leading to low memory being
	  consumed by page tables.  Setting this option will allow
	  user-space 2nd level page tables to reside in high memory.
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config CPU_SW_DOMAIN_PAN
	bool "Enable use of CPU domains to implement privileged no-access"
	depends on MMU && !ARM_LPAE
1677 1678
	default y
	help
1679 1680 1681 1682 1683 1684 1685 1686 1687
	  Increase kernel security by ensuring that normal kernel accesses
	  are unable to access userspace addresses.  This can help prevent
	  use-after-free bugs becoming an exploitable privilege escalation
	  by ensuring that magic values (such as LIST_POISON) will always
	  fault when dereferenced.

	  CPUs with low-vector mappings use a best-efforts implementation.
	  Their lower 1MB needs to remain accessible for the vectors, but
	  the remainder of userspace will become appropriately inaccessible.
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1689
config HW_PERF_EVENTS
1690 1691
	def_bool y
	depends on ARM_PMU
1692

1693 1694 1695 1696
config SYS_SUPPORTS_HUGETLBFS
       def_bool y
       depends on ARM_LPAE

1697 1698 1699 1700
config HAVE_ARCH_TRANSPARENT_HUGEPAGE
       def_bool y
       depends on ARM_LPAE

1701 1702 1703
config ARCH_WANT_GENERAL_HUGETLB
	def_bool y

1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718
config ARM_MODULE_PLTS
	bool "Use PLTs to allow module memory to spill over into vmalloc area"
	depends on MODULES
	help
	  Allocate PLTs when loading modules so that jumps and calls whose
	  targets are too far away for their relative offsets to be encoded
	  in the instructions themselves can be bounced via veneers in the
	  module's PLT. This allows modules to be allocated in the generic
	  vmalloc area after the dedicated module memory area has been
	  exhausted. The modules will use slightly more memory, but after
	  rounding up to page size, the actual memory footprint is usually
	  the same.

	  Say y if you are getting out of memory errors while loading modules

1719 1720
source "mm/Kconfig"

1721
config FORCE_MAX_ZONEORDER
1722
	int "Maximum zone order"
1723
	default "12" if SOC_AM33XX
1724
	default "9" if SA1111 || ARCH_EFM32
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
	default "11"
	help
	  The kernel memory allocator divides physically contiguous memory
	  blocks into "zones", where each zone is a power of two number of
	  pages.  This option selects the largest power of two that the kernel
	  keeps in the memory allocator.  If you need to allocate very large
	  blocks of physically contiguous memory, then you may need to
	  increase this value.

	  This config option is actually maximum order plus one. For example,
	  a value of 11 means that the largest free memory block is 2^10 pages.

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config ALIGNMENT_TRAP
	bool
1739
	depends on CPU_CP15_MMU
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	default y if !ARCH_EBSA110
1741
	select HAVE_PROC_CPU if PROC_FS
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	help
1743
	  ARM processors cannot fetch/store information which is not
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	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
	  address divisible by 4. On 32-bit ARM processors, these non-aligned
	  fetch/store instructions will be emulated in software if you say
	  here, which has a severe performance impact. This is necessary for
	  correct operation of some network protocols. With an IP-only
	  configuration it is safe to say N, otherwise say Y.

1751
config UACCESS_WITH_MEMCPY
1752 1753
	bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
	depends on MMU
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	default y if CPU_FEROCEON
	help
	  Implement faster copy_to_user and clear_user methods for CPU
	  cores where a 8-word STM instruction give significantly higher
	  memory write throughput than a sequence of individual 32bit stores.

	  A possible side effect is a slight increase in scheduling latency
	  between threads sharing the same address space if they invoke
	  such copy operations with large buffers.

	  However, if the CPU data cache is using a write-allocate mode,
	  this option is unlikely to provide any performance gain.

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config SECCOMP
	bool
	prompt "Enable seccomp to safely compute untrusted bytecode"
	---help---
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.

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config SWIOTLB
	def_bool y

config IOMMU_HELPER
	def_bool SWIOTLB

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config XEN_DOM0
	def_bool y
	depends on XEN

config XEN
1792
	bool "Xen guest support on ARM"
1793
	depends on ARM && AEABI && OF
1794
	depends on CPU_V7 && !CPU_V6
1795
	depends on !GENERIC_ATOMIC64
1796
	depends on MMU
1797
	select ARCH_DMA_ADDR_T_64BIT
1798
	select ARM_PSCI
1799
	select SWIOTLB_XEN
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	help
	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.

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endmenu

menu "Boot options"

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config USE_OF
	bool "Flattened Device Tree support"
1809
	select IRQ_DOMAIN
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	select OF
	help
	  Include support for flattened device tree machine descriptions.

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config ATAGS
	bool "Support for the traditional ATAGS boot data passing" if USE_OF
	default y
	help
	  This is the traditional way of passing data to the kernel at boot
	  time. If you are solely relying on the flattened device tree (or
	  the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
	  to remove ATAGS support from your kernel binary.  If unsure,
	  leave this to y.

config DEPRECATED_PARAM_STRUCT
	bool "Provide old way to pass kernel parameters"
	depends on ATAGS
	help
	  This was deprecated in 2001 and announced to live on for 5 years.
	  Some old boot loaders still use this way.

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# Compressed boot loader in ROM.  Yes, we really want to ask about
# TEXT and BSS so we preserve their values in the config files.
config ZBOOT_ROM_TEXT
	hex "Compressed ROM boot loader base address"
	default "0"
	help
	  The physical address at which the ROM-able zImage is to be
	  placed in the target.  Platforms which normally make use of
	  ROM-able zImage formats normally set this to a suitable
	  value in their defconfig file.

	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM_BSS
	hex "Compressed ROM boot loader BSS address"
	default "0"
	help
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	  The base address of an area of read/write memory in the target
	  for the ROM-able zImage which must be available while the
	  decompressor is running. It must be large enough to hold the
	  entire decompressed kernel plus an additional 128 KiB.
	  Platforms which normally make use of ROM-able zImage formats
	  normally set this to a suitable value in their defconfig file.
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	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM
	bool "Compressed boot loader in ROM/flash"
	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1860
	depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
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	help
	  Say Y here if you intend to execute your compressed kernel image
	  (zImage) directly from ROM or flash.  If unsure, say N.

1865 1866
config ARM_APPENDED_DTB
	bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
1867
	depends on OF
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	help
	  With this option, the boot code will look for a device tree binary
	  (DTB) appended to zImage
	  (e.g. cat zImage <filename>.dtb > zImage_w_dtb).

	  This is meant as a backward compatibility convenience for those
	  systems with a bootloader that can't be upgraded to accommodate
	  the documented boot protocol using a device tree.

	  Beware that there is very little in terms of protection against
	  this option being confused by leftover garbage in memory that might
	  look like a DTB header after a reboot if no actual DTB is appended
	  to zImage.  Do not leave this option active in a production kernel
	  if you don't intend to always append a DTB.  Proper passing of the
	  location into r2 of a bootloader provided DTB is always preferable
	  to this option.

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config ARM_ATAG_DTB_COMPAT
	bool "Supplement the appended DTB with traditional ATAG information"
	depends on ARM_APPENDED_DTB
	help
	  Some old bootloaders can't be updated to a DTB capable one, yet
	  they provide ATAGs with memory configuration, the ramdisk address,
	  the kernel cmdline string, etc.  Such information is dynamically
	  provided by the bootloader and can't always be stored in a static
	  DTB.  To allow a device tree enabled kernel to be used with such
	  bootloaders, this option allows zImage to extract the information
	  from the ATAG list and store it at run time into the appended DTB.

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choice
	prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
	default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER

config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
	bool "Use bootloader kernel arguments if available"
	help
	  Uses the command-line options passed by the boot loader instead of
	  the device tree bootargs property. If the boot loader doesn't provide
	  any, the device tree bootargs property will be used.

config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
	bool "Extend with bootloader kernel arguments"
	help
	  The command-line arguments provided by the boot loader will be
	  appended to the the device tree bootargs property.

endchoice

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config CMDLINE
	string "Default kernel command string"
	default ""
	help
	  On some architectures (EBSA110 and CATS), there is currently no way
	  for the boot loader to pass arguments to the kernel. For these
	  architectures, you should supply some command-line options at build
	  time by entering them here. As a minimum, you should specify the
	  memory size and the root device (e.g., mem=64M root=/dev/nfs).

1926 1927 1928
choice
	prompt "Kernel command line type" if CMDLINE != ""
	default CMDLINE_FROM_BOOTLOADER
1929
	depends on ATAGS
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config CMDLINE_FROM_BOOTLOADER
	bool "Use bootloader kernel arguments if available"
	help
	  Uses the command-line options passed by the boot loader. If
	  the boot loader doesn't provide any, the default kernel command
	  string provided in CMDLINE will be used.

config CMDLINE_EXTEND
	bool "Extend bootloader kernel arguments"
	help
	  The command-line arguments provided by the boot loader will be
	  appended to the default kernel command string.

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config CMDLINE_FORCE
	bool "Always use the default kernel command string"
	help
	  Always use the default kernel command string, even if the boot
	  loader passes other arguments to the kernel.
	  This is useful if you cannot or don't want to change the
	  command-line options your boot loader passes to the kernel.
1951
endchoice
1952

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config XIP_KERNEL
	bool "Kernel Execute-In-Place from ROM"
1955
	depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
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	help
	  Execute-In-Place allows the kernel to run from non-volatile storage
	  directly addressable by the CPU, such as NOR flash. This saves RAM
	  space since the text section of the kernel is not loaded from flash
	  to RAM.  Read-write sections, such as the data section and stack,
	  are still copied to RAM.  The XIP kernel is not compressed since
	  it has to run directly from flash, so it will take more space to
	  store it.  The flash address used to link the kernel object files,
	  and for storing it, is configuration dependent. Therefore, if you
	  say Y here, you must know the proper physical address where to
	  store the kernel image depending on your own flash memory usage.

	  Also note that the make target becomes "make xipImage" rather than
	  "make zImage" or "make Image".  The final kernel binary to put in
	  ROM memory will be arch/arm/boot/xipImage.

	  If unsure, say N.

config XIP_PHYS_ADDR
	hex "XIP Kernel Physical Location"
	depends on XIP_KERNEL
	default "0x00080000"
	help
	  This is the physical address in your flash memory the kernel will
	  be linked for and stored to.  This address is dependent on your
	  own flash usage.

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config KEXEC
	bool "Kexec system call (EXPERIMENTAL)"
1985
	depends on (!SMP || PM_SLEEP_SMP)
1986
	depends on !CPU_V7M
1987
	select KEXEC_CORE
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	help
	  kexec is a system call that implements the ability to shutdown your
	  current kernel, and to start another kernel.  It is like a reboot
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	  but it is independent of the system firmware.   And like a reboot
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	  you can start any kernel with it, not just Linux.

	  It is an ongoing process to be certain the hardware in a machine
	  is properly shutdown, so do not be surprised if this code does not
1996
	  initially work for you.
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1998 1999
config ATAGS_PROC
	bool "Export atags in procfs"
2000
	depends on ATAGS && KEXEC
2001
	default y
2002 2003 2004 2005
	help
	  Should the atags used to boot the kernel be exported in an "atags"
	  file in procfs. Useful with kexec.

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
config CRASH_DUMP
	bool "Build kdump crash kernel (EXPERIMENTAL)"
	help
	  Generate crash dump after being started by kexec. This should
	  be normally only set in special crash dump kernels which are
	  loaded in the main kernel with kexec-tools into a specially
	  reserved region and then later executed after a crash by
	  kdump/kexec. The crash dump kernel must be compiled to a
	  memory address not used by the main kernel

	  For more details see Documentation/kdump/kdump.txt

2018 2019 2020 2021 2022 2023 2024 2025 2026
config AUTO_ZRELADDR
	bool "Auto calculation of the decompressed kernel image address"
	help
	  ZRELADDR is the physical address where the decompressed kernel
	  image will be placed. If AUTO_ZRELADDR is selected, the address
	  will be determined at run-time by masking the current IP with
	  0xf8000000. This assumes the zImage being placed in the first 128MB
	  from start of memory.

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endmenu

2029
menu "CPU Power Management"
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source "drivers/cpufreq/Kconfig"

2033 2034 2035 2036
source "drivers/cpuidle/Kconfig"

endmenu

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menu "Floating point emulation"

comment "At least one emulation must be selected"

config FPE_NWFPE
	bool "NWFPE math emulation"
2043
	depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
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	---help---
	  Say Y to include the NWFPE floating point emulator in the kernel.
	  This is necessary to run most binaries. Linux does not currently
	  support floating point hardware so you need to say Y here even if
	  your machine has an FPA or floating point co-processor podule.

	  You may say N here if you are going to load the Acorn FPEmulator
	  early in the bootup.

config FPE_NWFPE_XP
	bool "Support extended precision"
2055
	depends on FPE_NWFPE
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	help
	  Say Y to include 80-bit support in the kernel floating-point
	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
	  Note that gcc does not generate 80-bit operations by default,
	  so in most cases this option only enlarges the size of the
	  floating point emulator without any good reason.

	  You almost surely want to say N here.

config FPE_FASTFPE
	bool "FastFPE math emulation (EXPERIMENTAL)"
2067
	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
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	---help---
	  Say Y here to include the FAST floating point emulator in the kernel.
	  This is an experimental much faster emulator which now also has full
	  precision for the mantissa.  It does not support any exceptions.
	  It is very simple, and approximately 3-6 times faster than NWFPE.

	  It should be sufficient for most programs.  It may be not suitable
	  for scientific calculations, but you have to check this for yourself.
	  If you do not feel you need a faster FP emulation you should better
	  choose NWFPE.

config VFP
	bool "VFP-format floating point maths"
2081
	depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
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	help
	  Say Y to include VFP support code in the kernel. This is needed
	  if your hardware includes a VFP unit.

	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
	  release notes and additional status information.

	  Say N if your target does not have VFP hardware.

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config VFPv3
	bool
	depends on VFP
	default y if CPU_V7

2096 2097 2098 2099 2100 2101 2102
config NEON
	bool "Advanced SIMD (NEON) Extension support"
	depends on VFPv3 && CPU_V7
	help
	  Say Y to include support code for NEON, the ARMv7 Advanced SIMD
	  Extension.

2103 2104
config KERNEL_MODE_NEON
	bool "Support for NEON in kernel mode"
2105
	depends on NEON && AEABI
2106 2107 2108
	help
	  Say Y to include support for NEON in kernel mode.

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endmenu

menu "Userspace binary formats"

source "fs/Kconfig.binfmt"

endmenu

menu "Power management options"

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source "kernel/power/Kconfig"
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config ARCH_SUSPEND_POSSIBLE
2122
	depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
2123
		CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
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	def_bool y

2126 2127 2128
config ARM_CPU_SUSPEND
	def_bool PM_SLEEP

2129 2130 2131 2132 2133
config ARCH_HIBERNATION_POSSIBLE
	bool
	depends on MMU
	default y if ARCH_SUSPEND_POSSIBLE

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endmenu

2136 2137
source "net/Kconfig"

2138
source "drivers/Kconfig"
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2140 2141
source "drivers/firmware/Kconfig"

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source "fs/Kconfig"

source "arch/arm/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"
2149 2150 2151
if CRYPTO
source "arch/arm/crypto/Kconfig"
endif
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source "lib/Kconfig"
2154 2155

source "arch/arm/kvm/Kconfig"