Linux kernel mirror (for testing)
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1# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/kconfig-language.txt.
3
4mainmenu "Linux/Xtensa Kernel Configuration"
5
6config FRAME_POINTER
7 def_bool n
8
9config ZONE_DMA
10 def_bool y
11
12config XTENSA
13 def_bool y
14 select HAVE_IDE
15 help
16 Xtensa processors are 32-bit RISC machines designed by Tensilica
17 primarily for embedded systems. These processors are both
18 configurable and extensible. The Linux port to the Xtensa
19 architecture supports all processor configurations and extensions,
20 with reasonable minimum requirements. The Xtensa Linux project has
21 a home page at <http://xtensa.sourceforge.net/>.
22
23config RWSEM_XCHGADD_ALGORITHM
24 def_bool y
25
26config GENERIC_FIND_NEXT_BIT
27 def_bool y
28
29config GENERIC_HWEIGHT
30 def_bool y
31
32config GENERIC_HARDIRQS
33 def_bool y
34
35config GENERIC_GPIO
36 def_bool y
37
38config ARCH_HAS_ILOG2_U32
39 def_bool n
40
41config ARCH_HAS_ILOG2_U64
42 def_bool n
43
44config NO_IOPORT
45 def_bool y
46
47config HZ
48 int
49 default 100
50
51config GENERIC_TIME
52 def_bool y
53
54source "init/Kconfig"
55source "kernel/Kconfig.freezer"
56
57config MMU
58 def_bool n
59
60config VARIANT_IRQ_SWITCH
61 def_bool n
62
63menu "Processor type and features"
64
65choice
66 prompt "Xtensa Processor Configuration"
67 default XTENSA_VARIANT_FSF
68
69config XTENSA_VARIANT_FSF
70 bool "fsf - default (not generic) configuration"
71 select MMU
72
73config XTENSA_VARIANT_DC232B
74 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
75 select MMU
76 help
77 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
78
79config XTENSA_VARIANT_S6000
80 bool "s6000 - Stretch software configurable processor"
81 select VARIANT_IRQ_SWITCH
82 select ARCH_REQUIRE_GPIOLIB
83 select XTENSA_CALIBRATE_CCOUNT
84endchoice
85
86config XTENSA_UNALIGNED_USER
87 bool "Unaligned memory access in use space"
88 help
89 The Xtensa architecture currently does not handle unaligned
90 memory accesses in hardware but through an exception handler.
91 Per default, unaligned memory accesses are disabled in user space.
92
93 Say Y here to enable unaligned memory access in user space.
94
95config PREEMPT
96 bool "Preemptible Kernel"
97 help
98 This option reduces the latency of the kernel when reacting to
99 real-time or interactive events by allowing a low priority process to
100 be preempted even if it is in kernel mode executing a system call.
101 Unfortunately the kernel code has some race conditions if both
102 CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
103 currently disabled if you are building an SMP kernel.
104
105 Say Y here if you are building a kernel for a desktop, embedded
106 or real-time system. Say N if you are unsure.
107
108config MATH_EMULATION
109 bool "Math emulation"
110 help
111 Can we use information of configuration file?
112
113endmenu
114
115config XTENSA_CALIBRATE_CCOUNT
116 def_bool n
117 help
118 On some platforms (XT2000, for example), the CPU clock rate can
119 vary. The frequency can be determined, however, by measuring
120 against a well known, fixed frequency, such as an UART oscillator.
121
122config SERIAL_CONSOLE
123 def_bool n
124
125config XTENSA_ISS_NETWORK
126 def_bool n
127
128menu "Bus options"
129
130config PCI
131 bool "PCI support"
132 default y
133 help
134 Find out whether you have a PCI motherboard. PCI is the name of a
135 bus system, i.e. the way the CPU talks to the other stuff inside
136 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
137 VESA. If you have PCI, say Y, otherwise N.
138
139source "drivers/pci/Kconfig"
140
141endmenu
142
143menu "Platform options"
144
145choice
146 prompt "Xtensa System Type"
147 default XTENSA_PLATFORM_ISS
148
149config XTENSA_PLATFORM_ISS
150 bool "ISS"
151 select XTENSA_CALIBRATE_CCOUNT
152 select SERIAL_CONSOLE
153 select XTENSA_ISS_NETWORK
154 help
155 ISS is an acronym for Tensilica's Instruction Set Simulator.
156
157config XTENSA_PLATFORM_XT2000
158 bool "XT2000"
159 help
160 XT2000 is the name of Tensilica's feature-rich emulation platform.
161 This hardware is capable of running a full Linux distribution.
162
163config XTENSA_PLATFORM_S6105
164 bool "S6105"
165 select SERIAL_CONSOLE
166
167endchoice
168
169
170config XTENSA_CPU_CLOCK
171 int "CPU clock rate [MHz]"
172 depends on !XTENSA_CALIBRATE_CCOUNT
173 default 16
174
175config GENERIC_CALIBRATE_DELAY
176 bool "Auto calibration of the BogoMIPS value"
177 help
178 The BogoMIPS value can easily be derived from the CPU frequency.
179
180config CMDLINE_BOOL
181 bool "Default bootloader kernel arguments"
182
183config CMDLINE
184 string "Initial kernel command string"
185 depends on CMDLINE_BOOL
186 default "console=ttyS0,38400 root=/dev/ram"
187 help
188 On some architectures (EBSA110 and CATS), there is currently no way
189 for the boot loader to pass arguments to the kernel. For these
190 architectures, you should supply some command-line options at build
191 time by entering them here. As a minimum, you should specify the
192 memory size and the root device (e.g., mem=64M root=/dev/nfs).
193
194source "mm/Kconfig"
195
196config HOTPLUG
197 bool "Support for hot-pluggable devices"
198 help
199 Say Y here if you want to plug devices into your computer while
200 the system is running, and be able to use them quickly. In many
201 cases, the devices can likewise be unplugged at any time too.
202
203 One well known example of this is PCMCIA- or PC-cards, credit-card
204 size devices such as network cards, modems or hard drives which are
205 plugged into slots found on all modern laptop computers. Another
206 example, used on modern desktops as well as laptops, is USB.
207
208 Enable HOTPLUG and build a modular kernel. Get agent software
209 (from <http://linux-hotplug.sourceforge.net/>) and install it.
210 Then your kernel will automatically call out to a user mode "policy
211 agent" (/sbin/hotplug) to load modules and set up software needed
212 to use devices as you hotplug them.
213
214source "drivers/pcmcia/Kconfig"
215
216source "drivers/pci/hotplug/Kconfig"
217
218endmenu
219
220menu "Executable file formats"
221
222# only elf supported
223config KCORE_ELF
224 def_bool y
225 depends on PROC_FS
226 help
227 If you enabled support for /proc file system then the file
228 /proc/kcore will contain the kernel core image in ELF format. This
229 can be used in gdb:
230
231 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
232
233 This is especially useful if you have compiled the kernel with the
234 "-g" option to preserve debugging information. It is mainly used
235 for examining kernel data structures on the live kernel.
236
237source "fs/Kconfig.binfmt"
238
239endmenu
240
241source "net/Kconfig"
242
243source "drivers/Kconfig"
244
245source "fs/Kconfig"
246
247menu "Xtensa initrd options"
248 depends on BLK_DEV_INITRD
249
250config EMBEDDED_RAMDISK
251 bool "Embed root filesystem ramdisk into the kernel"
252
253config EMBEDDED_RAMDISK_IMAGE
254 string "Filename of gzipped ramdisk image"
255 depends on EMBEDDED_RAMDISK
256 default "ramdisk.gz"
257 help
258 This is the filename of the ramdisk image to be built into the
259 kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
260 The ramdisk image is not part of the kernel distribution; you must
261 provide one yourself.
262endmenu
263
264source "arch/xtensa/Kconfig.debug"
265
266source "security/Kconfig"
267
268source "crypto/Kconfig"
269
270source "lib/Kconfig"
271
272