[net-next-2.6.git] / arch / xtensa / Kconfig

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

mainmenu "Linux/Xtensa Kernel Configuration"

config FRAME_POINTER
	bool
	default n

config XTENSA
	bool
	default y
	help
	  Xtensa processors are 32-bit RISC machines designed by Tensilica
	  primarily for embedded systems.  These processors are both
	  configurable and extensible.  The Linux port to the Xtensa
	  architecture supports all processor configurations and extensions,
	  with reasonable minimum requirements.  The Xtensa Linux project has
	  a home page at <http://xtensa.sourceforge.net/>.

config RWSEM_XCHGADD_ALGORITHM
	bool
	default y

config GENERIC_FIND_NEXT_BIT
	bool
	default y

config GENERIC_HWEIGHT
	bool
	default y

config GENERIC_HARDIRQS
	bool
	default y

config ARCH_HAS_ILOG2_U32
	bool
	default n

config ARCH_HAS_ILOG2_U64
	bool
	default n

source "init/Kconfig"

menu "Processor type and features"

choice
	prompt "Xtensa Processor Configuration"
	default XTENSA_VARIANT_FSF

config XTENSA_VARIANT_FSF
	bool "fsf"
endchoice

config MMU
	bool
	default y

config XTENSA_UNALIGNED_USER
	bool "Unaligned memory access in use space"
	---help---
	   The Xtensa architecture currently does not handle unaligned
	   memory accesses in hardware but through an exception handler.
	   Per default, unaligned memory accesses are disabled in user space.

	   Say Y here to enable unaligned memory access in user space.

config PREEMPT
	bool "Preemptible Kernel"
	---help---
           This option reduces the latency of the kernel when reacting to
           real-time or interactive events by allowing a low priority process to
           be preempted even if it is in kernel mode executing a system call.
           Unfortunately the kernel code has some race conditions if both
           CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
           currently disabled if you are building an SMP kernel.

           Say Y here if you are building a kernel for a desktop, embedded
           or real-time system.  Say N if you are unsure.

config MATH_EMULATION
	bool "Math emulation"
	help
	Can we use information of configuration file?

config HIGHMEM
	bool "High memory support"

endmenu

menu "Platform options"

choice
	prompt "Xtensa System Type"
	default XTENSA_PLATFORM_ISS

config XTENSA_PLATFORM_ISS
	bool "ISS"
	help
	  ISS is an acronym for Tensilica's Instruction Set Simulator.

config XTENSA_PLATFORM_XT2000
	bool "XT2000"
	help
	  XT2000 is the name of Tensilica's feature-rich emulation platform.
	  This hardware is capable of running a full Linux distribution.

endchoice


config XTENSA_CALIBRATE_CCOUNT
	bool "Auto calibration of the CPU clock rate"
	---help---
	  On some platforms (XT2000, for example), the CPU clock rate can
	  vary.  The frequency can be determined, however, by measuring
	  against a well known, fixed frequency, such as an UART oscillator.

config XTENSA_CPU_CLOCK
	int "CPU clock rate [MHz]"
	depends on !XTENSA_CALIBRATE_CCOUNT
	default "16"

config GENERIC_CALIBRATE_DELAY
	bool "Auto calibration of the BogoMIPS value"
	---help---
	  The BogoMIPS value can easily be derived from the CPU frequency.

config CMDLINE_BOOL
	bool "Default bootloader kernel arguments"

config CMDLINE
	string "Initial kernel command string"
	depends on CMDLINE_BOOL
	default "console=ttyS0,38400 root=/dev/ram"
	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).

config SERIAL_CONSOLE
	bool
	depends on XTENSA_PLATFORM_ISS
	default y

config XTENSA_ISS_NETWORK
	bool
	depends on XTENSA_PLATFORM_ISS
	default y

source "mm/Kconfig"

endmenu

menu "Bus options"

config PCI
	bool "PCI support" if !XTENSA_PLATFORM_ISS
	depends on !XTENSA_PLATFORM_ISS
	default y
	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.

	  The PCI-HOWTO, available from
	  <http://www.linuxdoc.org/docs.html#howto>, contains valuable
	  information about which PCI hardware does work under Linux and which
	  doesn't

source "drivers/pci/Kconfig"

config HOTPLUG

	bool "Support for hot-pluggable devices"
	---help---
	Say Y here if you want to plug devices into your computer while
	the system is running, and be able to use them quickly.  In many
	cases, the devices can likewise be unplugged at any time too.

	One well known example of this is PCMCIA- or PC-cards, credit-card
	size devices such as network cards, modems or hard drives which are
	plugged into slots found on all modern laptop computers.  Another
	example, used on modern desktops as well as laptops, is USB.

	Enable HOTPLUG and KMOD, and build a modular kernel.  Get agent
	software (at <http://linux-hotplug.sourceforge.net/>) and install it.
	Then your kernel will automatically call out to a user mode "policy
	agent" (/sbin/hotplug) to load modules and set up software needed
	to use devices as you hotplug them.

source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

endmenu

menu "Executable file formats"

# only elf supported
config KCORE_ELF
        bool
        depends on PROC_FS
        default y
        help
          If you enabled support for /proc file system then the file
          /proc/kcore will contain the kernel core image in ELF format. This
          can be used in gdb:

          $ cd /usr/src/linux ; gdb vmlinux /proc/kcore

          This is especially useful if you have compiled the kernel with the
          "-g" option to preserve debugging information. It is mainly used
	  for examining kernel data structures on the live kernel.

source "fs/Kconfig.binfmt"

endmenu

source "net/Kconfig"

source "drivers/Kconfig"

source "fs/Kconfig"

menu "Xtensa initrd options"
	depends on BLK_DEV_INITRD

	config EMBEDDED_RAMDISK
	bool "Embed root filesystem ramdisk into the kernel"

config EMBEDDED_RAMDISK_IMAGE
	string "Filename of gzipped ramdisk image"
	depends on EMBEDDED_RAMDISK
	default "ramdisk.gz"
	help
	  This is the filename of the ramdisk image to be built into the
	  kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
	  The ramdisk image is not part of the kernel distribution; you must
	  provide one yourself.
endmenu

source "arch/xtensa/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"
Commit	Line	Data
8e1a6dd2 CZ	1	# For a description of the syntax of this configuration file,
	2	# see Documentation/kbuild/config-language.txt.
	3
	4	mainmenu "Linux/Xtensa Kernel Configuration"
	5
	6	config FRAME_POINTER
	7	bool
	8	default n
	9
	10	config XTENSA
	11	bool
	12	default y
	13	help
	14	Xtensa processors are 32-bit RISC machines designed by Tensilica
	15	primarily for embedded systems. These processors are both
	16	configurable and extensible. The Linux port to the Xtensa
	17	architecture supports all processor configurations and extensions,
	18	with reasonable minimum requirements. The Xtensa Linux project has
	19	a home page at <http://xtensa.sourceforge.net/>.
	20
8e1a6dd2 CZ	21	config RWSEM_XCHGADD_ALGORITHM
	22	bool
	23	default y
	24
d4337aa5 AM	25	config GENERIC_FIND_NEXT_BIT
	26	bool
	27	default y
	28
	29	config GENERIC_HWEIGHT
	30	bool
	31	default y
	32
8e1a6dd2 CZ	33	config GENERIC_HARDIRQS
	34	bool
	35	default y
	36
f0d1b0b3 DH	37	config ARCH_HAS_ILOG2_U32
	38	bool
	39	default n
	40
	41	config ARCH_HAS_ILOG2_U64
	42	bool
	43	default n
	44
8e1a6dd2 CZ	45	source "init/Kconfig"
	46
	47	menu "Processor type and features"
	48
	49	choice
	50	prompt "Xtensa Processor Configuration"
173d6681	51	default XTENSA_VARIANT_FSF
8e1a6dd2	52
173d6681 CZ	53	config XTENSA_VARIANT_FSF
173d6681 CZ	54	bool "fsf"
8e1a6dd2 CZ	55	endchoice
	56
	57	config MMU
	58	bool
	59	default y
	60
	61	config XTENSA_UNALIGNED_USER
	62	bool "Unaligned memory access in use space"
	63	---help---
	64	The Xtensa architecture currently does not handle unaligned
	65	memory accesses in hardware but through an exception handler.
	66	Per default, unaligned memory accesses are disabled in user space.
	67
	68	Say Y here to enable unaligned memory access in user space.
	69
	70	config PREEMPT
	71	bool "Preemptible Kernel"
	72	---help---
	73	This option reduces the latency of the kernel when reacting to
	74	real-time or interactive events by allowing a low priority process to
	75	be preempted even if it is in kernel mode executing a system call.
	76	Unfortunately the kernel code has some race conditions if both
	77	CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
	78	currently disabled if you are building an SMP kernel.
	79
	80	Say Y here if you are building a kernel for a desktop, embedded
	81	or real-time system. Say N if you are unsure.
	82
	83	config MATH_EMULATION
	84	bool "Math emulation"
	85	help
	86	Can we use information of configuration file?
	87
	88	config HIGHMEM
	89	bool "High memory support"
	90
	91	endmenu
	92
	93	menu "Platform options"
	94
	95	choice
	96	prompt "Xtensa System Type"
	97	default XTENSA_PLATFORM_ISS
	98
	99	config XTENSA_PLATFORM_ISS
	100	bool "ISS"
	101	help
	102	ISS is an acronym for Tensilica's Instruction Set Simulator.
	103
	104	config XTENSA_PLATFORM_XT2000
	105	bool "XT2000"
	106	help
	107	XT2000 is the name of Tensilica's feature-rich emulation platform.
	108	This hardware is capable of running a full Linux distribution.
	109
	110	endchoice
	111
	112
	113	config XTENSA_CALIBRATE_CCOUNT
	114	bool "Auto calibration of the CPU clock rate"
	115	---help---
	116	On some platforms (XT2000, for example), the CPU clock rate can
	117	vary. The frequency can be determined, however, by measuring
	118	against a well known, fixed frequency, such as an UART oscillator.
119
120	config XTENSA_CPU_CLOCK
121	int "CPU clock rate [MHz]"
122	depends on !XTENSA_CALIBRATE_CCOUNT
123	default "16"
124
125	config GENERIC_CALIBRATE_DELAY
126	bool "Auto calibration of the BogoMIPS value"
127	---help---
82300bf4	128	The BogoMIPS value can easily be derived from the CPU frequency.
8e1a6dd2 CZ	129
	130	config CMDLINE_BOOL
	131	bool "Default bootloader kernel arguments"
	132
	133	config CMDLINE
	134	string "Initial kernel command string"
	135	depends on CMDLINE_BOOL
	136	default "console=ttyS0,38400 root=/dev/ram"
	137	help
	138	On some architectures (EBSA110 and CATS), there is currently no way
	139	for the boot loader to pass arguments to the kernel. For these
	140	architectures, you should supply some command-line options at build
	141	time by entering them here. As a minimum, you should specify the
	142	memory size and the root device (e.g., mem=64M root=/dev/nfs).
	143
	144	config SERIAL_CONSOLE
	145	bool
	146	depends on XTENSA_PLATFORM_ISS
	147	default y
	148
	149	config XTENSA_ISS_NETWORK
	150	bool
	151	depends on XTENSA_PLATFORM_ISS
	152	default y
	153
82300bf4 CZ	154	source "mm/Kconfig"
82300bf4 CZ	155
8e1a6dd2 CZ	156	endmenu
	157
	158	menu "Bus options"
	159
	160	config PCI
	161	bool "PCI support" if !XTENSA_PLATFORM_ISS
	162	depends on !XTENSA_PLATFORM_ISS
	163	default y
	164	help
	165	Find out whether you have a PCI motherboard. PCI is the name of a
	166	bus system, i.e. the way the CPU talks to the other stuff inside
	167	your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
	168	VESA. If you have PCI, say Y, otherwise N.
	169
	170	The PCI-HOWTO, available from
	171	<http://www.linuxdoc.org/docs.html#howto>, contains valuable
	172	information about which PCI hardware does work under Linux and which
	173	doesn't
	174
	175	source "drivers/pci/Kconfig"
	176
	177	config HOTPLUG
	178
	179	bool "Support for hot-pluggable devices"
	180	---help---
	181	Say Y here if you want to plug devices into your computer while
	182	the system is running, and be able to use them quickly. In many
	183	cases, the devices can likewise be unplugged at any time too.
	184
	185	One well known example of this is PCMCIA- or PC-cards, credit-card
	186	size devices such as network cards, modems or hard drives which are
	187	plugged into slots found on all modern laptop computers. Another
	188	example, used on modern desktops as well as laptops, is USB.
	189
	190	Enable HOTPLUG and KMOD, and build a modular kernel. Get agent
	191	software (at <http://linux-hotplug.sourceforge.net/>) and install it.
	192	Then your kernel will automatically call out to a user mode "policy
	193	agent" (/sbin/hotplug) to load modules and set up software needed
	194	to use devices as you hotplug them.
	195
	196	source "drivers/pcmcia/Kconfig"
	197
	198	source "drivers/pci/hotplug/Kconfig"
	199
	200	endmenu
	201
cab00891	202	menu "Executable file formats"
8e1a6dd2 CZ	203
	204	# only elf supported
	205	config KCORE_ELF
	206	bool
	207	depends on PROC_FS
	208	default y
	209	help
	210	If you enabled support for /proc file system then the file
	211	/proc/kcore will contain the kernel core image in ELF format. This
	212	can be used in gdb:
	213
	214	$ cd /usr/src/linux ; gdb vmlinux /proc/kcore
	215
	216	This is especially useful if you have compiled the kernel with the
	217	"-g" option to preserve debugging information. It is mainly used
	218	for examining kernel data structures on the live kernel.
	219
	220	source "fs/Kconfig.binfmt"
	221
	222	endmenu
	223
d5950b43 SR	224	source "net/Kconfig"
d5950b43 SR	225
8e1a6dd2 CZ	226	source "drivers/Kconfig"
	227
	228	source "fs/Kconfig"
	229
	230	menu "Xtensa initrd options"
	231	depends on BLK_DEV_INITRD
	232
	233	config EMBEDDED_RAMDISK
	234	bool "Embed root filesystem ramdisk into the kernel"
	235
	236	config EMBEDDED_RAMDISK_IMAGE
cab00891	237	string "Filename of gzipped ramdisk image"
8e1a6dd2 CZ	238	depends on EMBEDDED_RAMDISK
	239	default "ramdisk.gz"
	240	help
	241	This is the filename of the ramdisk image to be built into the
	242	kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
	243	The ramdisk image is not part of the kernel distribution; you must
	244	provide one yourself.
	245	endmenu
	246
	247	source "arch/xtensa/Kconfig.debug"
	248
	249	source "security/Kconfig"
	250
	251	source "crypto/Kconfig"
	252
	253	source "lib/Kconfig"
	254
	255