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8e1a6dd2 | 1 | # For a description of the syntax of this configuration file, |
e403149c | 2 | # see Documentation/kbuild/kconfig-language.txt. |
8e1a6dd2 CZ |
3 | |
4 | mainmenu "Linux/Xtensa Kernel Configuration" | |
5 | ||
6 | config FRAME_POINTER | |
35f9cd08 | 7 | def_bool n |
8e1a6dd2 | 8 | |
66701b14 | 9 | config ZONE_DMA |
35f9cd08 | 10 | def_bool y |
66701b14 | 11 | |
8e1a6dd2 | 12 | config XTENSA |
35f9cd08 | 13 | def_bool y |
ec7748b5 | 14 | select HAVE_IDE |
8e1a6dd2 CZ |
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 | ||
8e1a6dd2 | 23 | config RWSEM_XCHGADD_ALGORITHM |
35f9cd08 | 24 | def_bool y |
8e1a6dd2 | 25 | |
d4337aa5 | 26 | config GENERIC_FIND_NEXT_BIT |
35f9cd08 | 27 | def_bool y |
d4337aa5 AM |
28 | |
29 | config GENERIC_HWEIGHT | |
35f9cd08 | 30 | def_bool y |
d4337aa5 | 31 | |
8e1a6dd2 | 32 | config GENERIC_HARDIRQS |
35f9cd08 | 33 | def_bool y |
8e1a6dd2 | 34 | |
000af2c5 JW |
35 | config GENERIC_GPIO |
36 | def_bool y | |
37 | ||
f0d1b0b3 | 38 | config ARCH_HAS_ILOG2_U32 |
35f9cd08 | 39 | def_bool n |
f0d1b0b3 DH |
40 | |
41 | config ARCH_HAS_ILOG2_U64 | |
35f9cd08 | 42 | def_bool n |
f0d1b0b3 | 43 | |
5ea81769 AV |
44 | config NO_IOPORT |
45 | def_bool y | |
46 | ||
bdc80787 PA |
47 | config HZ |
48 | int | |
49 | default 100 | |
50 | ||
fcc8f0f8 JW |
51 | config GENERIC_TIME |
52 | def_bool y | |
53 | ||
8e1a6dd2 | 54 | source "init/Kconfig" |
dc52ddc0 | 55 | source "kernel/Kconfig.freezer" |
8e1a6dd2 | 56 | |
35f9cd08 JW |
57 | config MMU |
58 | def_bool n | |
59 | ||
4c0d2141 JW |
60 | config VARIANT_IRQ_SWITCH |
61 | def_bool n | |
62 | ||
8e1a6dd2 CZ |
63 | menu "Processor type and features" |
64 | ||
65 | choice | |
66 | prompt "Xtensa Processor Configuration" | |
173d6681 | 67 | default XTENSA_VARIANT_FSF |
8e1a6dd2 | 68 | |
173d6681 | 69 | config XTENSA_VARIANT_FSF |
0025427e | 70 | bool "fsf - default (not generic) configuration" |
35f9cd08 | 71 | select MMU |
0025427e CZ |
72 | |
73 | config XTENSA_VARIANT_DC232B | |
74 | bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" | |
35f9cd08 | 75 | select MMU |
0025427e | 76 | help |
35f9cd08 | 77 | This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). |
000af2c5 JW |
78 | |
79 | config XTENSA_VARIANT_S6000 | |
80 | bool "s6000 - Stretch software configurable processor" | |
81 | select VARIANT_IRQ_SWITCH | |
82 | select ARCH_REQUIRE_GPIOLIB | |
b070a03f | 83 | select XTENSA_CALIBRATE_CCOUNT |
8e1a6dd2 CZ |
84 | endchoice |
85 | ||
8e1a6dd2 CZ |
86 | config XTENSA_UNALIGNED_USER |
87 | bool "Unaligned memory access in use space" | |
35f9cd08 JW |
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. | |
8e1a6dd2 | 92 | |
35f9cd08 | 93 | Say Y here to enable unaligned memory access in user space. |
8e1a6dd2 CZ |
94 | |
95 | config PREEMPT | |
96 | bool "Preemptible Kernel" | |
35f9cd08 JW |
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. | |
8e1a6dd2 | 104 | |
35f9cd08 JW |
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. | |
8e1a6dd2 CZ |
107 | |
108 | config MATH_EMULATION | |
109 | bool "Math emulation" | |
110 | help | |
111 | Can we use information of configuration file? | |
112 | ||
8e1a6dd2 CZ |
113 | endmenu |
114 | ||
35f9cd08 JW |
115 | config 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 | ||
122 | config SERIAL_CONSOLE | |
123 | def_bool n | |
124 | ||
125 | config XTENSA_ISS_NETWORK | |
126 | def_bool n | |
127 | ||
128 | menu "Bus options" | |
129 | ||
130 | config 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 | ||
139 | source "drivers/pci/Kconfig" | |
140 | ||
35e71f90 CZ |
141 | endmenu |
142 | ||
8e1a6dd2 CZ |
143 | menu "Platform options" |
144 | ||
145 | choice | |
146 | prompt "Xtensa System Type" | |
147 | default XTENSA_PLATFORM_ISS | |
148 | ||
149 | config XTENSA_PLATFORM_ISS | |
150 | bool "ISS" | |
35f9cd08 JW |
151 | select XTENSA_CALIBRATE_CCOUNT |
152 | select SERIAL_CONSOLE | |
153 | select XTENSA_ISS_NETWORK | |
8e1a6dd2 CZ |
154 | help |
155 | ISS is an acronym for Tensilica's Instruction Set Simulator. | |
156 | ||
157 | config 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 | ||
f82e939f JW |
163 | config XTENSA_PLATFORM_S6105 |
164 | bool "S6105" | |
165 | select SERIAL_CONSOLE | |
166 | ||
8e1a6dd2 CZ |
167 | endchoice |
168 | ||
169 | ||
8e1a6dd2 CZ |
170 | config XTENSA_CPU_CLOCK |
171 | int "CPU clock rate [MHz]" | |
172 | depends on !XTENSA_CALIBRATE_CCOUNT | |
35f9cd08 | 173 | default 16 |
8e1a6dd2 CZ |
174 | |
175 | config GENERIC_CALIBRATE_DELAY | |
176 | bool "Auto calibration of the BogoMIPS value" | |
35f9cd08 | 177 | help |
82300bf4 | 178 | The BogoMIPS value can easily be derived from the CPU frequency. |
8e1a6dd2 CZ |
179 | |
180 | config CMDLINE_BOOL | |
181 | bool "Default bootloader kernel arguments" | |
182 | ||
183 | config 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 | ||
82300bf4 CZ |
194 | source "mm/Kconfig" |
195 | ||
35f9cd08 JW |
196 | config HOTPLUG |
197 | bool "Support for hot-pluggable devices" | |
8e1a6dd2 | 198 | help |
35f9cd08 JW |
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. | |
8e1a6dd2 | 202 | |
35f9cd08 JW |
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. | |
8e1a6dd2 | 207 | |
35f9cd08 JW |
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. | |
8e1a6dd2 CZ |
213 | |
214 | source "drivers/pcmcia/Kconfig" | |
215 | ||
216 | source "drivers/pci/hotplug/Kconfig" | |
217 | ||
218 | endmenu | |
219 | ||
cab00891 | 220 | menu "Executable file formats" |
8e1a6dd2 CZ |
221 | |
222 | # only elf supported | |
223 | config KCORE_ELF | |
35f9cd08 | 224 | def_bool y |
8e1a6dd2 | 225 | depends on PROC_FS |
8e1a6dd2 CZ |
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 | ||
237 | source "fs/Kconfig.binfmt" | |
238 | ||
239 | endmenu | |
240 | ||
d5950b43 SR |
241 | source "net/Kconfig" |
242 | ||
8e1a6dd2 CZ |
243 | source "drivers/Kconfig" |
244 | ||
245 | source "fs/Kconfig" | |
246 | ||
247 | menu "Xtensa initrd options" | |
248 | depends on BLK_DEV_INITRD | |
249 | ||
35f9cd08 | 250 | config EMBEDDED_RAMDISK |
8e1a6dd2 CZ |
251 | bool "Embed root filesystem ramdisk into the kernel" |
252 | ||
253 | config EMBEDDED_RAMDISK_IMAGE | |
cab00891 | 254 | string "Filename of gzipped ramdisk image" |
8e1a6dd2 CZ |
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. | |
262 | endmenu | |
263 | ||
264 | source "arch/xtensa/Kconfig.debug" | |
265 | ||
266 | source "security/Kconfig" | |
267 | ||
268 | source "crypto/Kconfig" | |
269 | ||
270 | source "lib/Kconfig" | |
271 | ||
272 |