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1 | # For a description of the syntax of this configuration file, |
2 | # see Documentation/kbuild/config-language.txt. | |
3 | ||
4 | mainmenu "Linux/Xtensa Kernel Configuration" | |
5 | ||
6 | config FRAME_POINTER | |
7 | bool | |
8 | default n | |
9 | ||
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10 | config ZONE_DMA |
11 | bool | |
12 | default y | |
13 | ||
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14 | config XTENSA |
15 | bool | |
16 | default y | |
17 | help | |
18 | Xtensa processors are 32-bit RISC machines designed by Tensilica | |
19 | primarily for embedded systems. These processors are both | |
20 | configurable and extensible. The Linux port to the Xtensa | |
21 | architecture supports all processor configurations and extensions, | |
22 | with reasonable minimum requirements. The Xtensa Linux project has | |
23 | a home page at <http://xtensa.sourceforge.net/>. | |
24 | ||
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25 | config RWSEM_XCHGADD_ALGORITHM |
26 | bool | |
27 | default y | |
28 | ||
d4337aa5 AM |
29 | config GENERIC_FIND_NEXT_BIT |
30 | bool | |
31 | default y | |
32 | ||
33 | config GENERIC_HWEIGHT | |
34 | bool | |
35 | default y | |
36 | ||
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37 | config GENERIC_HARDIRQS |
38 | bool | |
39 | default y | |
40 | ||
f0d1b0b3 DH |
41 | config ARCH_HAS_ILOG2_U32 |
42 | bool | |
43 | default n | |
44 | ||
45 | config ARCH_HAS_ILOG2_U64 | |
46 | bool | |
47 | default n | |
48 | ||
5ea81769 AV |
49 | config NO_IOPORT |
50 | def_bool y | |
51 | ||
8e1a6dd2 CZ |
52 | source "init/Kconfig" |
53 | ||
54 | menu "Processor type and features" | |
55 | ||
56 | choice | |
57 | prompt "Xtensa Processor Configuration" | |
173d6681 | 58 | default XTENSA_VARIANT_FSF |
8e1a6dd2 | 59 | |
173d6681 CZ |
60 | config XTENSA_VARIANT_FSF |
61 | bool "fsf" | |
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62 | endchoice |
63 | ||
64 | config MMU | |
65 | bool | |
66 | default y | |
67 | ||
68 | config XTENSA_UNALIGNED_USER | |
69 | bool "Unaligned memory access in use space" | |
70 | ---help--- | |
71 | The Xtensa architecture currently does not handle unaligned | |
72 | memory accesses in hardware but through an exception handler. | |
73 | Per default, unaligned memory accesses are disabled in user space. | |
74 | ||
75 | Say Y here to enable unaligned memory access in user space. | |
76 | ||
77 | config PREEMPT | |
78 | bool "Preemptible Kernel" | |
79 | ---help--- | |
80 | This option reduces the latency of the kernel when reacting to | |
81 | real-time or interactive events by allowing a low priority process to | |
82 | be preempted even if it is in kernel mode executing a system call. | |
83 | Unfortunately the kernel code has some race conditions if both | |
84 | CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is | |
85 | currently disabled if you are building an SMP kernel. | |
86 | ||
87 | Say Y here if you are building a kernel for a desktop, embedded | |
88 | or real-time system. Say N if you are unsure. | |
89 | ||
90 | config MATH_EMULATION | |
91 | bool "Math emulation" | |
92 | help | |
93 | Can we use information of configuration file? | |
94 | ||
95 | config HIGHMEM | |
96 | bool "High memory support" | |
97 | ||
98 | endmenu | |
99 | ||
100 | menu "Platform options" | |
101 | ||
102 | choice | |
103 | prompt "Xtensa System Type" | |
104 | default XTENSA_PLATFORM_ISS | |
105 | ||
106 | config XTENSA_PLATFORM_ISS | |
107 | bool "ISS" | |
108 | help | |
109 | ISS is an acronym for Tensilica's Instruction Set Simulator. | |
110 | ||
111 | config XTENSA_PLATFORM_XT2000 | |
112 | bool "XT2000" | |
113 | help | |
114 | XT2000 is the name of Tensilica's feature-rich emulation platform. | |
115 | This hardware is capable of running a full Linux distribution. | |
116 | ||
117 | endchoice | |
118 | ||
119 | ||
120 | config XTENSA_CALIBRATE_CCOUNT | |
121 | bool "Auto calibration of the CPU clock rate" | |
122 | ---help--- | |
123 | On some platforms (XT2000, for example), the CPU clock rate can | |
124 | vary. The frequency can be determined, however, by measuring | |
125 | against a well known, fixed frequency, such as an UART oscillator. | |
126 | ||
127 | config XTENSA_CPU_CLOCK | |
128 | int "CPU clock rate [MHz]" | |
129 | depends on !XTENSA_CALIBRATE_CCOUNT | |
130 | default "16" | |
131 | ||
132 | config GENERIC_CALIBRATE_DELAY | |
133 | bool "Auto calibration of the BogoMIPS value" | |
134 | ---help--- | |
82300bf4 | 135 | The BogoMIPS value can easily be derived from the CPU frequency. |
8e1a6dd2 CZ |
136 | |
137 | config CMDLINE_BOOL | |
138 | bool "Default bootloader kernel arguments" | |
139 | ||
140 | config CMDLINE | |
141 | string "Initial kernel command string" | |
142 | depends on CMDLINE_BOOL | |
143 | default "console=ttyS0,38400 root=/dev/ram" | |
144 | help | |
145 | On some architectures (EBSA110 and CATS), there is currently no way | |
146 | for the boot loader to pass arguments to the kernel. For these | |
147 | architectures, you should supply some command-line options at build | |
148 | time by entering them here. As a minimum, you should specify the | |
149 | memory size and the root device (e.g., mem=64M root=/dev/nfs). | |
150 | ||
151 | config SERIAL_CONSOLE | |
152 | bool | |
153 | depends on XTENSA_PLATFORM_ISS | |
154 | default y | |
155 | ||
156 | config XTENSA_ISS_NETWORK | |
157 | bool | |
158 | depends on XTENSA_PLATFORM_ISS | |
159 | default y | |
160 | ||
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161 | source "mm/Kconfig" |
162 | ||
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163 | endmenu |
164 | ||
165 | menu "Bus options" | |
166 | ||
167 | config PCI | |
168 | bool "PCI support" if !XTENSA_PLATFORM_ISS | |
169 | depends on !XTENSA_PLATFORM_ISS | |
170 | default y | |
171 | help | |
172 | Find out whether you have a PCI motherboard. PCI is the name of a | |
173 | bus system, i.e. the way the CPU talks to the other stuff inside | |
174 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
175 | VESA. If you have PCI, say Y, otherwise N. | |
176 | ||
177 | The PCI-HOWTO, available from | |
178 | <http://www.linuxdoc.org/docs.html#howto>, contains valuable | |
179 | information about which PCI hardware does work under Linux and which | |
180 | doesn't | |
181 | ||
182 | source "drivers/pci/Kconfig" | |
183 | ||
184 | config 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 | ||
203 | source "drivers/pcmcia/Kconfig" | |
204 | ||
205 | source "drivers/pci/hotplug/Kconfig" | |
206 | ||
207 | endmenu | |
208 | ||
cab00891 | 209 | menu "Executable file formats" |
8e1a6dd2 CZ |
210 | |
211 | # only elf supported | |
212 | config 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 | ||
227 | source "fs/Kconfig.binfmt" | |
228 | ||
229 | endmenu | |
230 | ||
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231 | source "net/Kconfig" |
232 | ||
8e1a6dd2 CZ |
233 | source "drivers/Kconfig" |
234 | ||
235 | source "fs/Kconfig" | |
236 | ||
237 | menu "Xtensa initrd options" | |
238 | depends on BLK_DEV_INITRD | |
239 | ||
240 | config EMBEDDED_RAMDISK | |
241 | bool "Embed root filesystem ramdisk into the kernel" | |
242 | ||
243 | config EMBEDDED_RAMDISK_IMAGE | |
cab00891 | 244 | string "Filename of gzipped ramdisk image" |
8e1a6dd2 CZ |
245 | 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. | |
252 | endmenu | |
253 | ||
254 | source "arch/xtensa/Kconfig.debug" | |
255 | ||
256 | source "security/Kconfig" | |
257 | ||
258 | source "crypto/Kconfig" | |
259 | ||
260 | source "lib/Kconfig" | |
261 | ||
262 |