blob: 2e74cb0b7807fd986fa4993e9baf4044f8c015f9 [file] [log] [blame]
Chris Zankel8e1a6dd2005-06-23 22:01:10 -07001# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/config-language.txt.
3
4mainmenu "Linux/Xtensa Kernel Configuration"
5
6config FRAME_POINTER
7 bool
8 default n
9
10config 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
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070021config RWSEM_XCHGADD_ALGORITHM
22 bool
23 default y
24
Akinobu Mitad4337aa2006-03-26 01:39:43 -080025config GENERIC_FIND_NEXT_BIT
26 bool
27 default y
28
29config GENERIC_HWEIGHT
30 bool
31 default y
32
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070033config GENERIC_HARDIRQS
34 bool
35 default y
36
David Howellsf0d1b0b2006-12-08 02:37:49 -080037config ARCH_HAS_ILOG2_U32
38 bool
39 default n
40
41config ARCH_HAS_ILOG2_U64
42 bool
43 default n
44
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070045source "init/Kconfig"
46
47menu "Processor type and features"
48
49choice
50 prompt "Xtensa Processor Configuration"
Chris Zankel173d6682006-12-10 02:18:48 -080051 default XTENSA_VARIANT_FSF
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070052
Chris Zankel173d6682006-12-10 02:18:48 -080053config XTENSA_VARIANT_FSF
54 bool "fsf"
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070055endchoice
56
57config MMU
58 bool
59 default y
60
61config 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
70config 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
83config MATH_EMULATION
84 bool "Math emulation"
85 help
86 Can we use information of configuration file?
87
88config HIGHMEM
89 bool "High memory support"
90
91endmenu
92
93menu "Platform options"
94
95choice
96 prompt "Xtensa System Type"
97 default XTENSA_PLATFORM_ISS
98
99config XTENSA_PLATFORM_ISS
100 bool "ISS"
101 help
102 ISS is an acronym for Tensilica's Instruction Set Simulator.
103
104config 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
110endchoice
111
112
113config 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
120config XTENSA_CPU_CLOCK
121 int "CPU clock rate [MHz]"
122 depends on !XTENSA_CALIBRATE_CCOUNT
123 default "16"
124
125config GENERIC_CALIBRATE_DELAY
126 bool "Auto calibration of the BogoMIPS value"
127 ---help---
Chris Zankel82300bf2005-06-30 02:58:58 -0700128 The BogoMIPS value can easily be derived from the CPU frequency.
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700129
130config CMDLINE_BOOL
131 bool "Default bootloader kernel arguments"
132
133config 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
144config SERIAL_CONSOLE
145 bool
146 depends on XTENSA_PLATFORM_ISS
147 default y
148
149config XTENSA_ISS_NETWORK
150 bool
151 depends on XTENSA_PLATFORM_ISS
152 default y
153
Chris Zankel82300bf2005-06-30 02:58:58 -0700154source "mm/Kconfig"
155
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700156endmenu
157
158menu "Bus options"
159
160config 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
175source "drivers/pci/Kconfig"
176
177config 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
196source "drivers/pcmcia/Kconfig"
197
198source "drivers/pci/hotplug/Kconfig"
199
200endmenu
201
Matt LaPlantecab00892006-10-03 22:36:44 +0200202menu "Executable file formats"
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700203
204# only elf supported
205config 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
220source "fs/Kconfig.binfmt"
221
222endmenu
223
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700224source "net/Kconfig"
225
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700226source "drivers/Kconfig"
227
228source "fs/Kconfig"
229
230menu "Xtensa initrd options"
231 depends on BLK_DEV_INITRD
232
233 config EMBEDDED_RAMDISK
234 bool "Embed root filesystem ramdisk into the kernel"
235
236config EMBEDDED_RAMDISK_IMAGE
Matt LaPlantecab00892006-10-03 22:36:44 +0200237 string "Filename of gzipped ramdisk image"
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700238 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.
245endmenu
246
247source "arch/xtensa/Kconfig.debug"
248
249source "security/Kconfig"
250
251source "crypto/Kconfig"
252
253source "lib/Kconfig"
254
255