[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

source "init/Kconfig"

menu "Processor type and features"

choice
	prompt "Xtensa Processor Configuration"
	default XTENSA_CPU_LINUX_BE

config XTENSA_CPU_LINUX_BE
	bool "linux_be"
	---help---
	  The linux_be processor configuration is the baseline Xtensa
	  configurations included in this kernel and also used by
	  binutils, gcc, and gdb. It contains no TIE, no coprocessors,
	  and the following configuration options:

	  Code Density Option                2 Misc Special Registers
	  NSA/NSAU Instructions              128-bit Data Bus Width
	  Processor ID                       8K, 2-way I and D Caches
	  Zero-Overhead Loops                2 Inst Address Break Registers
	  Big Endian                         2 Data Address Break Registers
	  64 General-Purpose Registers       JTAG Interface and Trace Port
	  17 Interrupts                      MMU w/ TLBs and Autorefill
	  3 Interrupt Levels                 8 Autorefill Ways (I/D TLBs)
	  3 Timers                           Unaligned Exceptions
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
	37	source "init/Kconfig"
	38
	39	menu "Processor type and features"
	40
	41	choice
	42	prompt "Xtensa Processor Configuration"
	43	default XTENSA_CPU_LINUX_BE
	44
	45	config XTENSA_CPU_LINUX_BE
	46	bool "linux_be"
	47	---help---
	48	The linux_be processor configuration is the baseline Xtensa
	49	configurations included in this kernel and also used by
	50	binutils, gcc, and gdb. It contains no TIE, no coprocessors,
	51	and the following configuration options:
	52
	53	Code Density Option 2 Misc Special Registers
	54	NSA/NSAU Instructions 128-bit Data Bus Width
	55	Processor ID 8K, 2-way I and D Caches
	56	Zero-Overhead Loops 2 Inst Address Break Registers
	57	Big Endian 2 Data Address Break Registers
	58	64 General-Purpose Registers JTAG Interface and Trace Port
	59	17 Interrupts MMU w/ TLBs and Autorefill
	60	3 Interrupt Levels 8 Autorefill Ways (I/D TLBs)
	61	3 Timers Unaligned Exceptions
	62	endchoice
	63
	64	config MMU
	65	bool
	66	default y
	67
	68	config XTENSA_UNALIGNED_USER
	69	bool "Unaligned memory access in use space"
	70	---help---
	71	The Xtensa architecture currently does not handle unaligned
	72	memory accesses in hardware but through an exception handler.
	73	Per default, unaligned memory accesses are disabled in user space.
	74
	75	Say Y here to enable unaligned memory access in user space.
	76
	77	config PREEMPT
	78	bool "Preemptible Kernel"
	79	---help---
	80	This option reduces the latency of the kernel when reacting to
	81	real-time or interactive events by allowing a low priority process to
	82	be preempted even if it is in kernel mode executing a system call.
	83	Unfortunately the kernel code has some race conditions if both
	84	CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
	85	currently disabled if you are building an SMP kernel.
	86
	87	Say Y here if you are building a kernel for a desktop, embedded
	88	or real-time system. Say N if you are unsure.
	89
	90	config MATH_EMULATION
	91	bool "Math emulation"
	92	help
	93	Can we use information of configuration file?
	94
	95	config HIGHMEM
	96	bool "High memory support"
97
98	endmenu
99
100	menu "Platform options"
101
102	choice
103	prompt "Xtensa System Type"
104	default XTENSA_PLATFORM_ISS
105
106	config XTENSA_PLATFORM_ISS
107	bool "ISS"
108	help
109	ISS is an acronym for Tensilica's Instruction Set Simulator.
110
111	config XTENSA_PLATFORM_XT2000
112	bool "XT2000"
113	help
114	XT2000 is the name of Tensilica's feature-rich emulation platform.
115	This hardware is capable of running a full Linux distribution.
116
117	endchoice
118
119
120	config XTENSA_CALIBRATE_CCOUNT
121	bool "Auto calibration of the CPU clock rate"
122	---help---
123	On some platforms (XT2000, for example), the CPU clock rate can
124	vary. The frequency can be determined, however, by measuring
125	against a well known, fixed frequency, such as an UART oscillator.
126
127	config XTENSA_CPU_CLOCK
128	int "CPU clock rate [MHz]"
129	depends on !XTENSA_CALIBRATE_CCOUNT
130	default "16"
131
132	config GENERIC_CALIBRATE_DELAY
133	bool "Auto calibration of the BogoMIPS value"
134	---help---
82300bf4	135	The BogoMIPS value can easily be derived from the CPU frequency.
8e1a6dd2 CZ	136
	137	config CMDLINE_BOOL
	138	bool "Default bootloader kernel arguments"
	139
	140	config CMDLINE
	141	string "Initial kernel command string"
	142	depends on CMDLINE_BOOL
	143	default "console=ttyS0,38400 root=/dev/ram"
	144	help
	145	On some architectures (EBSA110 and CATS), there is currently no way
	146	for the boot loader to pass arguments to the kernel. For these
	147	architectures, you should supply some command-line options at build
	148	time by entering them here. As a minimum, you should specify the
	149	memory size and the root device (e.g., mem=64M root=/dev/nfs).
	150
	151	config SERIAL_CONSOLE
	152	bool
	153	depends on XTENSA_PLATFORM_ISS
	154	default y
	155
	156	config XTENSA_ISS_NETWORK
	157	bool
	158	depends on XTENSA_PLATFORM_ISS
	159	default y
	160
82300bf4 CZ	161	source "mm/Kconfig"
82300bf4 CZ	162
8e1a6dd2 CZ	163	endmenu
	164
	165	menu "Bus options"
	166
	167	config PCI
	168	bool "PCI support" if !XTENSA_PLATFORM_ISS
	169	depends on !XTENSA_PLATFORM_ISS
	170	default y
	171	help
	172	Find out whether you have a PCI motherboard. PCI is the name of a
	173	bus system, i.e. the way the CPU talks to the other stuff inside
	174	your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
	175	VESA. If you have PCI, say Y, otherwise N.
	176
	177	The PCI-HOWTO, available from
	178	<http://www.linuxdoc.org/docs.html#howto>, contains valuable
	179	information about which PCI hardware does work under Linux and which
	180	doesn't
	181
	182	source "drivers/pci/Kconfig"
	183
	184	config HOTPLUG
	185
	186	bool "Support for hot-pluggable devices"
	187	---help---
	188	Say Y here if you want to plug devices into your computer while
	189	the system is running, and be able to use them quickly. In many
	190	cases, the devices can likewise be unplugged at any time too.
	191
	192	One well known example of this is PCMCIA- or PC-cards, credit-card
	193	size devices such as network cards, modems or hard drives which are
	194	plugged into slots found on all modern laptop computers. Another
	195	example, used on modern desktops as well as laptops, is USB.
	196
	197	Enable HOTPLUG and KMOD, and build a modular kernel. Get agent
	198	software (at <http://linux-hotplug.sourceforge.net/>) and install it.
	199	Then your kernel will automatically call out to a user mode "policy
	200	agent" (/sbin/hotplug) to load modules and set up software needed
	201	to use devices as you hotplug them.
	202
	203	source "drivers/pcmcia/Kconfig"
	204
	205	source "drivers/pci/hotplug/Kconfig"
	206
	207	endmenu
	208
cab00891	209	menu "Executable file formats"
8e1a6dd2 CZ	210
	211	# only elf supported
	212	config KCORE_ELF
	213	bool
	214	depends on PROC_FS
	215	default y
	216	help
	217	If you enabled support for /proc file system then the file
	218	/proc/kcore will contain the kernel core image in ELF format. This
	219	can be used in gdb:
	220
	221	$ cd /usr/src/linux ; gdb vmlinux /proc/kcore
	222
	223	This is especially useful if you have compiled the kernel with the
	224	"-g" option to preserve debugging information. It is mainly used
	225	for examining kernel data structures on the live kernel.
	226
	227	source "fs/Kconfig.binfmt"
	228
	229	endmenu
	230
d5950b43 SR	231	source "net/Kconfig"
d5950b43 SR	232
8e1a6dd2 CZ	233	source "drivers/Kconfig"
	234
	235	source "fs/Kconfig"
	236
	237	menu "Xtensa initrd options"
	238	depends on BLK_DEV_INITRD
	239
	240	config EMBEDDED_RAMDISK
	241	bool "Embed root filesystem ramdisk into the kernel"
	242
	243	config EMBEDDED_RAMDISK_IMAGE
cab00891	244	string "Filename of gzipped ramdisk image"
8e1a6dd2 CZ	245	depends on EMBEDDED_RAMDISK
	246	default "ramdisk.gz"
	247	help
	248	This is the filename of the ramdisk image to be built into the
	249	kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
	250	The ramdisk image is not part of the kernel distribution; you must
	251	provide one yourself.
	252	endmenu
	253
	254	source "arch/xtensa/Kconfig.debug"
	255
	256	source "security/Kconfig"
	257
	258	source "crypto/Kconfig"
	259
	260	source "lib/Kconfig"
	261
	262