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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 | ||
10 | config 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 | ||
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21 | config RWSEM_XCHGADD_ALGORITHM |
22 | bool | |
23 | default y | |
24 | ||
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25 | config GENERIC_HARDIRQS |
26 | bool | |
27 | default y | |
28 | ||
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29 | config RWSEM_GENERIC_SPINLOCK |
30 | bool | |
31 | default y | |
32 | ||
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33 | source "init/Kconfig" |
34 | ||
35 | menu "Processor type and features" | |
36 | ||
37 | choice | |
38 | prompt "Xtensa Processor Configuration" | |
39 | default XTENSA_CPU_LINUX_BE | |
40 | ||
41 | config XTENSA_CPU_LINUX_BE | |
42 | bool "linux_be" | |
43 | ---help--- | |
44 | The linux_be processor configuration is the baseline Xtensa | |
45 | configurations included in this kernel and also used by | |
46 | binutils, gcc, and gdb. It contains no TIE, no coprocessors, | |
47 | and the following configuration options: | |
48 | ||
49 | Code Density Option 2 Misc Special Registers | |
50 | NSA/NSAU Instructions 128-bit Data Bus Width | |
51 | Processor ID 8K, 2-way I and D Caches | |
52 | Zero-Overhead Loops 2 Inst Address Break Registers | |
53 | Big Endian 2 Data Address Break Registers | |
54 | 64 General-Purpose Registers JTAG Interface and Trace Port | |
55 | 17 Interrupts MMU w/ TLBs and Autorefill | |
56 | 3 Interrupt Levels 8 Autorefill Ways (I/D TLBs) | |
57 | 3 Timers Unaligned Exceptions | |
58 | endchoice | |
59 | ||
60 | config MMU | |
61 | bool | |
62 | default y | |
63 | ||
64 | config XTENSA_UNALIGNED_USER | |
65 | bool "Unaligned memory access in use space" | |
66 | ---help--- | |
67 | The Xtensa architecture currently does not handle unaligned | |
68 | memory accesses in hardware but through an exception handler. | |
69 | Per default, unaligned memory accesses are disabled in user space. | |
70 | ||
71 | Say Y here to enable unaligned memory access in user space. | |
72 | ||
73 | config PREEMPT | |
74 | bool "Preemptible Kernel" | |
75 | ---help--- | |
76 | This option reduces the latency of the kernel when reacting to | |
77 | real-time or interactive events by allowing a low priority process to | |
78 | be preempted even if it is in kernel mode executing a system call. | |
79 | Unfortunately the kernel code has some race conditions if both | |
80 | CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is | |
81 | currently disabled if you are building an SMP kernel. | |
82 | ||
83 | Say Y here if you are building a kernel for a desktop, embedded | |
84 | or real-time system. Say N if you are unsure. | |
85 | ||
86 | config MATH_EMULATION | |
87 | bool "Math emulation" | |
88 | help | |
89 | Can we use information of configuration file? | |
90 | ||
91 | config HIGHMEM | |
92 | bool "High memory support" | |
93 | ||
94 | endmenu | |
95 | ||
96 | menu "Platform options" | |
97 | ||
98 | choice | |
99 | prompt "Xtensa System Type" | |
100 | default XTENSA_PLATFORM_ISS | |
101 | ||
102 | config XTENSA_PLATFORM_ISS | |
103 | bool "ISS" | |
104 | help | |
105 | ISS is an acronym for Tensilica's Instruction Set Simulator. | |
106 | ||
107 | config XTENSA_PLATFORM_XT2000 | |
108 | bool "XT2000" | |
109 | help | |
110 | XT2000 is the name of Tensilica's feature-rich emulation platform. | |
111 | This hardware is capable of running a full Linux distribution. | |
112 | ||
113 | endchoice | |
114 | ||
115 | ||
116 | config XTENSA_CALIBRATE_CCOUNT | |
117 | bool "Auto calibration of the CPU clock rate" | |
118 | ---help--- | |
119 | On some platforms (XT2000, for example), the CPU clock rate can | |
120 | vary. The frequency can be determined, however, by measuring | |
121 | against a well known, fixed frequency, such as an UART oscillator. | |
122 | ||
123 | config XTENSA_CPU_CLOCK | |
124 | int "CPU clock rate [MHz]" | |
125 | depends on !XTENSA_CALIBRATE_CCOUNT | |
126 | default "16" | |
127 | ||
128 | config GENERIC_CALIBRATE_DELAY | |
129 | bool "Auto calibration of the BogoMIPS value" | |
130 | ---help--- | |
82300bf4 | 131 | The BogoMIPS value can easily be derived from the CPU frequency. |
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132 | |
133 | config CMDLINE_BOOL | |
134 | bool "Default bootloader kernel arguments" | |
135 | ||
136 | config CMDLINE | |
137 | string "Initial kernel command string" | |
138 | depends on CMDLINE_BOOL | |
139 | default "console=ttyS0,38400 root=/dev/ram" | |
140 | help | |
141 | On some architectures (EBSA110 and CATS), there is currently no way | |
142 | for the boot loader to pass arguments to the kernel. For these | |
143 | architectures, you should supply some command-line options at build | |
144 | time by entering them here. As a minimum, you should specify the | |
145 | memory size and the root device (e.g., mem=64M root=/dev/nfs). | |
146 | ||
147 | config SERIAL_CONSOLE | |
148 | bool | |
149 | depends on XTENSA_PLATFORM_ISS | |
150 | default y | |
151 | ||
152 | config XTENSA_ISS_NETWORK | |
153 | bool | |
154 | depends on XTENSA_PLATFORM_ISS | |
155 | default y | |
156 | ||
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157 | source "mm/Kconfig" |
158 | ||
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159 | endmenu |
160 | ||
161 | menu "Bus options" | |
162 | ||
163 | config PCI | |
164 | bool "PCI support" if !XTENSA_PLATFORM_ISS | |
165 | depends on !XTENSA_PLATFORM_ISS | |
166 | default y | |
167 | help | |
168 | Find out whether you have a PCI motherboard. PCI is the name of a | |
169 | bus system, i.e. the way the CPU talks to the other stuff inside | |
170 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
171 | VESA. If you have PCI, say Y, otherwise N. | |
172 | ||
173 | The PCI-HOWTO, available from | |
174 | <http://www.linuxdoc.org/docs.html#howto>, contains valuable | |
175 | information about which PCI hardware does work under Linux and which | |
176 | doesn't | |
177 | ||
178 | source "drivers/pci/Kconfig" | |
179 | ||
180 | config HOTPLUG | |
181 | ||
182 | bool "Support for hot-pluggable devices" | |
183 | ---help--- | |
184 | Say Y here if you want to plug devices into your computer while | |
185 | the system is running, and be able to use them quickly. In many | |
186 | cases, the devices can likewise be unplugged at any time too. | |
187 | ||
188 | One well known example of this is PCMCIA- or PC-cards, credit-card | |
189 | size devices such as network cards, modems or hard drives which are | |
190 | plugged into slots found on all modern laptop computers. Another | |
191 | example, used on modern desktops as well as laptops, is USB. | |
192 | ||
193 | Enable HOTPLUG and KMOD, and build a modular kernel. Get agent | |
194 | software (at <http://linux-hotplug.sourceforge.net/>) and install it. | |
195 | Then your kernel will automatically call out to a user mode "policy | |
196 | agent" (/sbin/hotplug) to load modules and set up software needed | |
197 | to use devices as you hotplug them. | |
198 | ||
199 | source "drivers/pcmcia/Kconfig" | |
200 | ||
201 | source "drivers/pci/hotplug/Kconfig" | |
202 | ||
203 | endmenu | |
204 | ||
205 | menu "Exectuable file formats" | |
206 | ||
207 | # only elf supported | |
208 | config KCORE_ELF | |
209 | bool | |
210 | depends on PROC_FS | |
211 | default y | |
212 | help | |
213 | If you enabled support for /proc file system then the file | |
214 | /proc/kcore will contain the kernel core image in ELF format. This | |
215 | can be used in gdb: | |
216 | ||
217 | $ cd /usr/src/linux ; gdb vmlinux /proc/kcore | |
218 | ||
219 | This is especially useful if you have compiled the kernel with the | |
220 | "-g" option to preserve debugging information. It is mainly used | |
221 | for examining kernel data structures on the live kernel. | |
222 | ||
223 | source "fs/Kconfig.binfmt" | |
224 | ||
225 | endmenu | |
226 | ||
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227 | source "net/Kconfig" |
228 | ||
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229 | source "drivers/Kconfig" |
230 | ||
231 | source "fs/Kconfig" | |
232 | ||
233 | menu "Xtensa initrd options" | |
234 | depends on BLK_DEV_INITRD | |
235 | ||
236 | config EMBEDDED_RAMDISK | |
237 | bool "Embed root filesystem ramdisk into the kernel" | |
238 | ||
239 | config EMBEDDED_RAMDISK_IMAGE | |
240 | string "Filename of gziped ramdisk image" | |
241 | depends on EMBEDDED_RAMDISK | |
242 | default "ramdisk.gz" | |
243 | help | |
244 | This is the filename of the ramdisk image to be built into the | |
245 | kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/. | |
246 | The ramdisk image is not part of the kernel distribution; you must | |
247 | provide one yourself. | |
248 | endmenu | |
249 | ||
250 | source "arch/xtensa/Kconfig.debug" | |
251 | ||
252 | source "security/Kconfig" | |
253 | ||
254 | source "crypto/Kconfig" | |
255 | ||
256 | source "lib/Kconfig" | |
257 | ||
258 |