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Chris Zankel8e1a6dd2005-06-23 22:01:10 -07001# For a description of the syntax of this configuration file,
Dirk Hohndele4031492007-10-30 13:37:19 -07002# see Documentation/kbuild/kconfig-language.txt.
Chris Zankel8e1a6dd2005-06-23 22:01:10 -07003
4mainmenu "Linux/Xtensa Kernel Configuration"
5
6config FRAME_POINTER
7 bool
8 default n
9
Christoph Lameter66701b12007-02-10 01:43:09 -080010config ZONE_DMA
11 bool
12 default y
13
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070014config XTENSA
15 bool
16 default y
Sam Ravnborgec7748b2008-02-09 10:46:40 +010017 select HAVE_IDE
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070018 help
19 Xtensa processors are 32-bit RISC machines designed by Tensilica
20 primarily for embedded systems. These processors are both
21 configurable and extensible. The Linux port to the Xtensa
22 architecture supports all processor configurations and extensions,
23 with reasonable minimum requirements. The Xtensa Linux project has
24 a home page at <http://xtensa.sourceforge.net/>.
25
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070026config RWSEM_XCHGADD_ALGORITHM
27 bool
28 default y
29
Akinobu Mitad4337aa2006-03-26 01:39:43 -080030config GENERIC_FIND_NEXT_BIT
31 bool
32 default y
33
34config GENERIC_HWEIGHT
35 bool
36 default y
37
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070038config GENERIC_HARDIRQS
39 bool
40 default y
41
David Howellsf0d1b0b2006-12-08 02:37:49 -080042config ARCH_HAS_ILOG2_U32
43 bool
44 default n
45
46config ARCH_HAS_ILOG2_U64
47 bool
48 default n
49
Al Viro5ea81762007-02-11 15:41:31 +000050config NO_IOPORT
51 def_bool y
52
H. Peter Anvinbdc80782008-02-08 04:21:26 -080053config HZ
54 int
55 default 100
56
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070057source "init/Kconfig"
58
59menu "Processor type and features"
60
61choice
62 prompt "Xtensa Processor Configuration"
Chris Zankel173d66812006-12-10 02:18:48 -080063 default XTENSA_VARIANT_FSF
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070064
Chris Zankel173d66812006-12-10 02:18:48 -080065config XTENSA_VARIANT_FSF
66 bool "fsf"
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070067endchoice
68
69config MMU
70 bool
71 default y
72
73config XTENSA_UNALIGNED_USER
74 bool "Unaligned memory access in use space"
75 ---help---
76 The Xtensa architecture currently does not handle unaligned
77 memory accesses in hardware but through an exception handler.
78 Per default, unaligned memory accesses are disabled in user space.
79
80 Say Y here to enable unaligned memory access in user space.
81
82config PREEMPT
83 bool "Preemptible Kernel"
84 ---help---
85 This option reduces the latency of the kernel when reacting to
86 real-time or interactive events by allowing a low priority process to
87 be preempted even if it is in kernel mode executing a system call.
88 Unfortunately the kernel code has some race conditions if both
89 CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
90 currently disabled if you are building an SMP kernel.
91
92 Say Y here if you are building a kernel for a desktop, embedded
93 or real-time system. Say N if you are unsure.
94
95config MATH_EMULATION
96 bool "Math emulation"
97 help
98 Can we use information of configuration file?
99
100config HIGHMEM
101 bool "High memory support"
102
103endmenu
104
105menu "Platform options"
106
107choice
108 prompt "Xtensa System Type"
109 default XTENSA_PLATFORM_ISS
110
111config XTENSA_PLATFORM_ISS
112 bool "ISS"
113 help
114 ISS is an acronym for Tensilica's Instruction Set Simulator.
115
116config XTENSA_PLATFORM_XT2000
117 bool "XT2000"
118 help
119 XT2000 is the name of Tensilica's feature-rich emulation platform.
120 This hardware is capable of running a full Linux distribution.
121
122endchoice
123
124
125config XTENSA_CALIBRATE_CCOUNT
126 bool "Auto calibration of the CPU clock rate"
127 ---help---
128 On some platforms (XT2000, for example), the CPU clock rate can
129 vary. The frequency can be determined, however, by measuring
130 against a well known, fixed frequency, such as an UART oscillator.
131
132config XTENSA_CPU_CLOCK
133 int "CPU clock rate [MHz]"
134 depends on !XTENSA_CALIBRATE_CCOUNT
135 default "16"
136
137config GENERIC_CALIBRATE_DELAY
138 bool "Auto calibration of the BogoMIPS value"
139 ---help---
Chris Zankel82300bf2005-06-30 02:58:58 -0700140 The BogoMIPS value can easily be derived from the CPU frequency.
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700141
142config CMDLINE_BOOL
143 bool "Default bootloader kernel arguments"
144
145config CMDLINE
146 string "Initial kernel command string"
147 depends on CMDLINE_BOOL
148 default "console=ttyS0,38400 root=/dev/ram"
149 help
150 On some architectures (EBSA110 and CATS), there is currently no way
151 for the boot loader to pass arguments to the kernel. For these
152 architectures, you should supply some command-line options at build
153 time by entering them here. As a minimum, you should specify the
154 memory size and the root device (e.g., mem=64M root=/dev/nfs).
155
156config SERIAL_CONSOLE
157 bool
158 depends on XTENSA_PLATFORM_ISS
159 default y
160
161config XTENSA_ISS_NETWORK
162 bool
163 depends on XTENSA_PLATFORM_ISS
164 default y
165
Chris Zankel82300bf2005-06-30 02:58:58 -0700166source "mm/Kconfig"
167
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700168endmenu
169
170menu "Bus options"
171
172config PCI
173 bool "PCI support" if !XTENSA_PLATFORM_ISS
174 depends on !XTENSA_PLATFORM_ISS
175 default y
176 help
177 Find out whether you have a PCI motherboard. PCI is the name of a
178 bus system, i.e. the way the CPU talks to the other stuff inside
179 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
180 VESA. If you have PCI, say Y, otherwise N.
181
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700182source "drivers/pci/Kconfig"
183
184config 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
203source "drivers/pcmcia/Kconfig"
204
205source "drivers/pci/hotplug/Kconfig"
206
207endmenu
208
Matt LaPlantecab00892006-10-03 22:36:44 +0200209menu "Executable file formats"
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700210
211# only elf supported
212config 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
227source "fs/Kconfig.binfmt"
228
229endmenu
230
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700231source "net/Kconfig"
232
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700233source "drivers/Kconfig"
234
235source "fs/Kconfig"
236
237menu "Xtensa initrd options"
238 depends on BLK_DEV_INITRD
239
240 config EMBEDDED_RAMDISK
241 bool "Embed root filesystem ramdisk into the kernel"
242
243config EMBEDDED_RAMDISK_IMAGE
Matt LaPlantecab00892006-10-03 22:36:44 +0200244 string "Filename of gzipped ramdisk image"
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700245 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.
252endmenu
253
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700254source "arch/xtensa/Kconfig.debug"
255
256source "security/Kconfig"
257
258source "crypto/Kconfig"
259
260source "lib/Kconfig"
261
262