arch/metag/Kconfig - arm/linux - Git at Google


            
            config METAG

            
            	def_bool y

            
            	select EMBEDDED

            
            	select GENERIC_ATOMIC64

            
            	select GENERIC_CLOCKEVENTS

            
            	select GENERIC_IRQ_SHOW

            
            	select GENERIC_SMP_IDLE_THREAD

            
            	select HAVE_64BIT_ALIGNED_ACCESS

            
            	select HAVE_ARCH_TRACEHOOK

            
            	select HAVE_C_RECORDMCOUNT

            
            	select HAVE_DEBUG_KMEMLEAK

            
            	select HAVE_DEBUG_STACKOVERFLOW

            
            	select HAVE_DYNAMIC_FTRACE

            
            	select HAVE_EXIT_THREAD

            
            	select HAVE_FTRACE_MCOUNT_RECORD

            
            	select HAVE_FUNCTION_TRACER

            
            	select HAVE_KERNEL_BZIP2

            
            	select HAVE_KERNEL_GZIP

            
            	select HAVE_KERNEL_LZO

            
            	select HAVE_KERNEL_XZ

            
            	select HAVE_MEMBLOCK

            
            	select HAVE_MEMBLOCK_NODE_MAP

            
            	select HAVE_MOD_ARCH_SPECIFIC

            
            	select HAVE_OPROFILE

            
            	select HAVE_PERF_EVENTS

            
            	select HAVE_SYSCALL_TRACEPOINTS

            
            	select HAVE_UNDERSCORE_SYMBOL_PREFIX

            
            	select IRQ_DOMAIN

            
            	select GENERIC_IRQ_EFFECTIVE_AFF_MASK

            
            	select MODULES_USE_ELF_RELA

            
            	select OF

            
            	select OF_EARLY_FLATTREE

            
            	select SPARSE_IRQ

            
            	select CPU_NO_EFFICIENT_FFS


            config STACKTRACE_SUPPORT

            
            	def_bool y


            config LOCKDEP_SUPPORT

            
            	def_bool y


            config RWSEM_GENERIC_SPINLOCK

            
            	def_bool y


            config RWSEM_XCHGADD_ALGORITHM

            
            	bool


            config GENERIC_HWEIGHT

            
            	def_bool y


            config GENERIC_CALIBRATE_DELAY

            
            	def_bool y


            config NO_IOPORT_MAP

            
            	def_bool y


            source "init/Kconfig"


            source "kernel/Kconfig.freezer"


            menu "Processor type and features"


            config MMU

            
            	def_bool y


            config STACK_GROWSUP

            
            	def_bool y


            config HOTPLUG_CPU

            
            	bool "Enable CPU hotplug support"

            
            	depends on SMP

            
            	help

            
            	  Say Y here to allow turning CPUs off and on. CPUs can be

            
            	  controlled through /sys/devices/system/cpu.


            	  Say N if you want to disable CPU hotplug.


            config HIGHMEM

            
            	bool "High Memory Support"

            
            	help

            
            	  The address space of Meta 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.


            source "arch/metag/mm/Kconfig"


            source "arch/metag/Kconfig.soc"


            config METAG_META12

            
            	bool

            
            	help

            
            	  Select this from the SoC config symbol to indicate that it contains a

            
            	  Meta 1.2 core.


            config METAG_META21

            
            	bool

            
            	help

            
            	  Select this from the SoC config symbol to indicate that it contains a

            
            	  Meta 2.1 core.


            config SMP

            
            	bool "Symmetric multi-processing support"

            
            	depends on METAG_META21 && METAG_META21_MMU

            
            	help

            
            	  This enables support for systems with more than one thread running

            
            	  Linux. If you have a system with only one thread running Linux,

            
            	  say N. Otherwise, say Y.


            config NR_CPUS

            
            	int "Maximum number of CPUs (2-4)" if SMP

            
            	range 2 4 if SMP

            
            	default "1" if !SMP

            
            	default "4" if SMP


            config METAG_SMP_WRITE_REORDERING

            
            	bool

            
            	help

            
            	  This attempts to prevent cache-memory incoherence due to external

            
            	  reordering of writes from different hardware threads when SMP is

            
            	  enabled. It adds fences (system event 0) to smp_mb and smp_rmb in an

            
            	  attempt to catch some of the cases, and also before writes to shared

            
            	  memory in LOCK1 protected atomics and spinlocks.

            
            	  This will not completely prevent cache incoherency on affected cores.


            config METAG_LNKGET_AROUND_CACHE

            
            	bool

            
            	depends on METAG_META21

            
            	help

            
            	  This indicates that the LNKGET/LNKSET instructions go around the

            
            	  cache, which requires some extra cache flushes when the memory needs

            
            	  to be accessed by normal GET/SET instructions too.


            choice

            
            	prompt "Atomicity primitive"

            
            	default METAG_ATOMICITY_LNKGET

            
            	help

            
            	  This option selects the mechanism for performing atomic operations.


            config METAG_ATOMICITY_IRQSOFF

            
            	depends on !SMP

            
            	bool "irqsoff"

            
            	help

            
            	  This option disables interrupts to achieve atomicity. This mechanism

            
            	  is not SMP-safe.


            config METAG_ATOMICITY_LNKGET

            
            	depends on METAG_META21

            
            	bool "lnkget/lnkset"

            
            	help

            
            	  This option uses the LNKGET and LNKSET instructions to achieve

            
            	  atomicity. LNKGET/LNKSET are load-link/store-conditional instructions.

            
            	  Choose this option if your system requires low latency.


            config METAG_ATOMICITY_LOCK1

            
            	depends on SMP

            
            	bool "lock1"

            
            	help

            
            	  This option uses the LOCK1 instruction for atomicity. This is mainly

            
            	  provided as a debugging aid if the lnkget/lnkset atomicity primitive

            
            	  isn't working properly.


            endchoice


            config METAG_FPU

            
            	bool "FPU Support"

            
            	depends on METAG_META21

            
            	default y

            
            	help

            
            	  This option allows processes to use FPU hardware available with this

            
            	  CPU. If this option is not enabled FPU registers will not be saved

            
            	  and restored on context-switch.


            	  If you plan on running programs which are compiled to use hard floats

            
            	  say Y here.


            config METAG_DSP

            
            	bool "DSP Support"

            
            	help

            
            	  This option allows processes to use DSP hardware available

            
            	  with this CPU. If this option is not enabled DSP registers

            
            	  will not be saved and restored on context-switch.


            	  If you plan on running DSP programs say Y here.


            config METAG_PERFCOUNTER_IRQS

            
            	bool "PerfCounters interrupt support"

            
            	depends on METAG_META21

            
            	help

            
            	  This option enables using interrupts to collect information from

            
            	  Performance Counters. This option is supported in new META21

            
            	  (starting from HTP265).


            	  When disabled, Performance Counters information will be collected

            
            	  based on Timer Interrupt.


            config HW_PERF_EVENTS

            
            	def_bool METAG_PERFCOUNTER_IRQS && PERF_EVENTS


            config METAG_DA

            
            	bool "DA support"

            
            	help

            
            	  Say Y if you plan to use a DA debug adapter with Linux. The presence

            
            	  of the DA will be detected automatically at boot, so it is safe to say

            
            	  Y to this option even when booting without a DA.


            	  This enables support for services provided by DA JTAG debug adapters,

            
            	  such as:

            
            	  - communication over DA channels (such as the console driver).

            
            	  - use of the DA filesystem.


            menu "Boot options"


            config METAG_BUILTIN_DTB

            
            	bool "Embed DTB in kernel image"

            
            	default y

            
            	help

            
            	  Embeds a device tree binary in the kernel image.


            config METAG_BUILTIN_DTB_NAME

            
            	string "Built in DTB"

            
            	depends on METAG_BUILTIN_DTB

            
            	help

            
            	  Set the name of the DTB to embed (leave blank to pick one

            
            	  automatically based on kernel configuration).


            config CMDLINE_BOOL

            
            	bool "Default bootloader kernel arguments"


            config CMDLINE

            
            	string "Kernel command line"

            
            	depends on CMDLINE_BOOL

            
            	help

            
            	  On some architectures 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.


            config CMDLINE_FORCE

            
            	bool "Force default kernel command string"

            
            	depends on CMDLINE_BOOL

            
            	help

            
            	  Set this to have arguments from the default kernel command string

            
            	  override those passed by the boot loader.


            endmenu


            source "kernel/Kconfig.preempt"


            source kernel/Kconfig.hz


            endmenu


            menu "Power management options"


            source kernel/power/Kconfig


            endmenu


            menu "Executable file formats"


            source "fs/Kconfig.binfmt"


            endmenu


            source "net/Kconfig"


            source "drivers/Kconfig"


            source "fs/Kconfig"


            source "arch/metag/Kconfig.debug"


            source "security/Kconfig"


            source "crypto/Kconfig"


            source "lib/Kconfig"
	config METAG
	def_bool y
	select EMBEDDED
	select GENERIC_ATOMIC64
	select GENERIC_CLOCKEVENTS
	select GENERIC_IRQ_SHOW
	select GENERIC_SMP_IDLE_THREAD
	select HAVE_64BIT_ALIGNED_ACCESS
	select HAVE_ARCH_TRACEHOOK
	select HAVE_C_RECORDMCOUNT
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DEBUG_STACKOVERFLOW
	select HAVE_DYNAMIC_FTRACE
	select HAVE_EXIT_THREAD
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_FUNCTION_TRACER
	select HAVE_KERNEL_BZIP2
	select HAVE_KERNEL_GZIP
	select HAVE_KERNEL_LZO
	select HAVE_KERNEL_XZ
	select HAVE_MEMBLOCK
	select HAVE_MEMBLOCK_NODE_MAP
	select HAVE_MOD_ARCH_SPECIFIC
	select HAVE_OPROFILE
	select HAVE_PERF_EVENTS
	select HAVE_SYSCALL_TRACEPOINTS
	select HAVE_UNDERSCORE_SYMBOL_PREFIX
	select IRQ_DOMAIN
	select GENERIC_IRQ_EFFECTIVE_AFF_MASK
	select MODULES_USE_ELF_RELA
	select OF
	select OF_EARLY_FLATTREE
	select SPARSE_IRQ
	select CPU_NO_EFFICIENT_FFS

	config STACKTRACE_SUPPORT
	def_bool y

	config LOCKDEP_SUPPORT
	def_bool y

	config RWSEM_GENERIC_SPINLOCK
	def_bool y

	config RWSEM_XCHGADD_ALGORITHM
	bool

	config GENERIC_HWEIGHT
	def_bool y

	config GENERIC_CALIBRATE_DELAY
	def_bool y

	config NO_IOPORT_MAP
	def_bool y

	source "init/Kconfig"

	source "kernel/Kconfig.freezer"

	menu "Processor type and features"

	config MMU
	def_bool y

	config STACK_GROWSUP
	def_bool y

	config HOTPLUG_CPU
	bool "Enable CPU hotplug support"
	depends on SMP
	help
	Say Y here to allow turning CPUs off and on. CPUs can be
	controlled through /sys/devices/system/cpu.

	Say N if you want to disable CPU hotplug.

	config HIGHMEM
	bool "High Memory Support"
	help
	The address space of Meta 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.

	source "arch/metag/mm/Kconfig"

	source "arch/metag/Kconfig.soc"

	config METAG_META12
	bool
	help
	Select this from the SoC config symbol to indicate that it contains a
	Meta 1.2 core.

	config METAG_META21
	bool
	help
	Select this from the SoC config symbol to indicate that it contains a
	Meta 2.1 core.

	config SMP
	bool "Symmetric multi-processing support"
	depends on METAG_META21 && METAG_META21_MMU
	help
	This enables support for systems with more than one thread running
	Linux. If you have a system with only one thread running Linux,
	say N. Otherwise, say Y.

	config NR_CPUS
	int "Maximum number of CPUs (2-4)" if SMP
	range 2 4 if SMP
	default "1" if !SMP
	default "4" if SMP

	config METAG_SMP_WRITE_REORDERING
	bool
	help
	This attempts to prevent cache-memory incoherence due to external
	reordering of writes from different hardware threads when SMP is
	enabled. It adds fences (system event 0) to smp_mb and smp_rmb in an
	attempt to catch some of the cases, and also before writes to shared
	memory in LOCK1 protected atomics and spinlocks.
	This will not completely prevent cache incoherency on affected cores.

	config METAG_LNKGET_AROUND_CACHE
	bool
	depends on METAG_META21
	help
	This indicates that the LNKGET/LNKSET instructions go around the
	cache, which requires some extra cache flushes when the memory needs
	to be accessed by normal GET/SET instructions too.

	choice
	prompt "Atomicity primitive"
	default METAG_ATOMICITY_LNKGET
	help
	This option selects the mechanism for performing atomic operations.

	config METAG_ATOMICITY_IRQSOFF
	depends on !SMP
	bool "irqsoff"
	help
	This option disables interrupts to achieve atomicity. This mechanism
	is not SMP-safe.

	config METAG_ATOMICITY_LNKGET
	depends on METAG_META21
	bool "lnkget/lnkset"
	help
	This option uses the LNKGET and LNKSET instructions to achieve
	atomicity. LNKGET/LNKSET are load-link/store-conditional instructions.
	Choose this option if your system requires low latency.

	config METAG_ATOMICITY_LOCK1
	depends on SMP
	bool "lock1"
	help
	This option uses the LOCK1 instruction for atomicity. This is mainly
	provided as a debugging aid if the lnkget/lnkset atomicity primitive
	isn't working properly.

	endchoice

	config METAG_FPU
	bool "FPU Support"
	depends on METAG_META21
	default y
	help
	This option allows processes to use FPU hardware available with this
	CPU. If this option is not enabled FPU registers will not be saved
	and restored on context-switch.

	If you plan on running programs which are compiled to use hard floats
	say Y here.

	config METAG_DSP
	bool "DSP Support"
	help
	This option allows processes to use DSP hardware available
	with this CPU. If this option is not enabled DSP registers
	will not be saved and restored on context-switch.

	If you plan on running DSP programs say Y here.

	config METAG_PERFCOUNTER_IRQS
	bool "PerfCounters interrupt support"
	depends on METAG_META21
	help
	This option enables using interrupts to collect information from
	Performance Counters. This option is supported in new META21
	(starting from HTP265).

	When disabled, Performance Counters information will be collected
	based on Timer Interrupt.

	config HW_PERF_EVENTS
	def_bool METAG_PERFCOUNTER_IRQS && PERF_EVENTS

	config METAG_DA
	bool "DA support"
	help
	Say Y if you plan to use a DA debug adapter with Linux. The presence
	of the DA will be detected automatically at boot, so it is safe to say
	Y to this option even when booting without a DA.

	This enables support for services provided by DA JTAG debug adapters,
	such as:
	- communication over DA channels (such as the console driver).
	- use of the DA filesystem.

	menu "Boot options"

	config METAG_BUILTIN_DTB
	bool "Embed DTB in kernel image"
	default y
	help
	Embeds a device tree binary in the kernel image.

	config METAG_BUILTIN_DTB_NAME
	string "Built in DTB"
	depends on METAG_BUILTIN_DTB
	help
	Set the name of the DTB to embed (leave blank to pick one
	automatically based on kernel configuration).

	config CMDLINE_BOOL
	bool "Default bootloader kernel arguments"

	config CMDLINE
	string "Kernel command line"
	depends on CMDLINE_BOOL
	help
	On some architectures 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.

	config CMDLINE_FORCE
	bool "Force default kernel command string"
	depends on CMDLINE_BOOL
	help
	Set this to have arguments from the default kernel command string
	override those passed by the boot loader.

	endmenu

	source "kernel/Kconfig.preempt"

	source kernel/Kconfig.hz

	endmenu

	menu "Power management options"

	source kernel/power/Kconfig

	endmenu

	menu "Executable file formats"

	source "fs/Kconfig.binfmt"

	endmenu

	source "net/Kconfig"

	source "drivers/Kconfig"

	source "fs/Kconfig"

	source "arch/metag/Kconfig.debug"

	source "security/Kconfig"

	source "crypto/Kconfig"

	source "lib/Kconfig"