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