path: root/arch/powerpc/Kconfig

# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#

mainmenu "Linux/PowerPC Kernel Configuration"

config PPC64
	bool "64-bit kernel"
	default n
	help
	  This option selects whether a 32-bit or a 64-bit kernel
	  will be built.

config PPC32
	bool
	default y if !PPC64

config 64BIT
	bool
	default y if PPC64

config PPC_MERGE
	def_bool y

config MMU
	bool
	default y

config GENERIC_HARDIRQS
	bool
	default y

config RWSEM_GENERIC_SPINLOCK
	bool

config RWSEM_XCHGADD_ALGORITHM
	bool
	default y

config GENERIC_HWEIGHT
	bool
	default y

config GENERIC_CALIBRATE_DELAY
	bool
	default y

config GENERIC_FIND_NEXT_BIT
	bool
	default y

config PPC
	bool
	default y

config EARLY_PRINTK
	bool
	default y

config COMPAT
	bool
	default y if PPC64

config SYSVIPC_COMPAT
	bool
	depends on COMPAT && SYSVIPC
	default y

# All PPC32s use generic nvram driver through ppc_md
config GENERIC_NVRAM
	bool
	default y if PPC32

config SCHED_NO_NO_OMIT_FRAME_POINTER
	bool
	default y

config ARCH_MAY_HAVE_PC_FDC
	bool
	default y

config PPC_OF
	def_bool y

config PPC_UDBG_16550
	bool
	default n

config GENERIC_TBSYNC
	bool
	default y if PPC32 && SMP
	default n

config DEFAULT_UIMAGE
	bool
	help
	  Used to allow a board to specify it wants a uImage built by default
	default n

menu "Processor support"
choice
	prompt "Processor Type"
	depends on PPC32
	default 6xx

config CLASSIC32
	bool "6xx/7xx/74xx"
	select PPC_FPU
	select 6xx
	help
	  There are four families of PowerPC chips supported.  The more common
	  types (601, 603, 604, 740, 750, 7400), the Motorola embedded
	  versions (821, 823, 850, 855, 860, 52xx, 82xx, 83xx), the AMCC
	  embedded versions (403 and 405) and the high end 64 bit Power
	  processors (POWER 3, POWER4, and IBM PPC970 also known as G5).
	  
	  Unless you are building a kernel for one of the embedded processor
	  systems, 64 bit IBM RS/6000 or an Apple G5, choose 6xx.
	  Note that the kernel runs in 32-bit mode even on 64-bit chips.

config PPC_52xx
	bool "Freescale 52xx"
	select 6xx
	select PPC_FPU
	
config PPC_82xx
	bool "Freescale 82xx"
	select 6xx
	select PPC_FPU

config PPC_83xx
	bool "Freescale 83xx"
	select 6xx
	select FSL_SOC
	select 83xx
	select PPC_FPU

config PPC_85xx
	bool "Freescale 85xx"
	select E500
	select FSL_SOC
	select 85xx

config PPC_86xx
	bool "Freescale 86xx"
	select 6xx
	select FSL_SOC
	select PPC_FPU
	select ALTIVEC
	help
	  The Freescale E600 SoCs have 74xx cores.

config 40x
	bool "AMCC 40x"

config 44x
	bool "AMCC 44x"

config 8xx
	bool "Freescale 8xx"

config E200
	bool "Freescale e200"

endchoice

config POWER4_ONLY
	bool "Optimize for POWER4"
	depends on PPC64
	default n
	---help---
	  Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
	  The resulting binary will not work on POWER3 or RS64 processors
	  when compiled with binutils 2.15 or later.

config POWER3
	bool
	depends on PPC64
	default y if !POWER4_ONLY

config POWER4
	depends on PPC64
	def_bool y

config 6xx
	bool

# this is temp to handle compat with arch=ppc
config 83xx
	bool

# this is temp to handle compat with arch=ppc
config 85xx
	bool

config E500
	bool

config PPC_FPU
	bool
	default y if PPC64

config BOOKE
	bool
	depends on E200 || E500
	default y

config FSL_BOOKE
	bool
	depends on E200 || E500
	default y

config PTE_64BIT
	bool
	depends on 44x || E500
	default y if 44x
	default y if E500 && PHYS_64BIT

config PHYS_64BIT
	bool 'Large physical address support' if E500
	depends on 44x || E500
	default y if 44x
	---help---
	  This option enables kernel support for larger than 32-bit physical
	  addresses.  This features is not be available on all e500 cores.

	  If in doubt, say N here.

config ALTIVEC
	bool "AltiVec Support"
	depends on CLASSIC32 || POWER4
	---help---
	  This option enables kernel support for the Altivec extensions to the
	  PowerPC processor. The kernel currently supports saving and restoring
	  altivec registers, and turning on the 'altivec enable' bit so user
	  processes can execute altivec instructions.

	  This option is only usefully if you have a processor that supports
	  altivec (G4, otherwise known as 74xx series), but does not have
	  any affect on a non-altivec cpu (it does, however add code to the
	  kernel).

	  If in doubt, say Y here.

config SPE
	bool "SPE Support"
	depends on E200 || E500
	default y
	---help---
	  This option enables kernel support for the Signal Processing
	  Extensions (SPE) to the PowerPC processor. The kernel currently
	  supports saving and restoring SPE registers, and turning on the
	  'spe enable' bit so user processes can execute SPE instructions.

	  This option is only useful if you have a processor that supports
	  SPE (e500, otherwise known as 85xx series), but does not have any
	  effect on a non-spe cpu (it does, however add code to the kernel).

	  If in doubt, say Y here.

config PPC_STD_MMU
	bool
	depends on 6xx || POWER3 || POWER4 || PPC64
	default y

config PPC_STD_MMU_32
	def_bool y
	depends on PPC_STD_MMU && PPC32

config VIRT_CPU_ACCOUNTING
	bool "Deterministic task and CPU time accounting"
	depends on PPC64
	default y
	help
	  Select this option to enable more accurate task and CPU time
	  accounting.  This is done by reading a CPU counter on each
	  kernel entry and exit and on transitions within the kernel
	  between system, softirq and hardirq state, so there is a
	  small performance impact.  This also enables accounting of
	  stolen time on logically-partitioned systems running on
	  IBM POWER5-based machines.

	  If in doubt, say Y here.

config SMP
	depends on PPC_STD_MMU
	bool "Symmetric multi-processing support"
	---help---
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, say N. If you have a system with more
	  than one CPU, say Y.  Note that the kernel does not currently
	  support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
	  since they have inadequate hardware support for multiprocessor
	  operation.

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on single-processor machines.
	  On a single-processor machine, the kernel will run faster if you say
	  N here.

	  If you don't know what to d