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Chris Zankel8e1a6dd2005-06-23 22:01:10 -07001# For a description of the syntax of this configuration file,
2# see Documentation/kbuild/config-language.txt.
3
4mainmenu "Linux/Xtensa Kernel Configuration"
5
6config FRAME_POINTER
7 bool
8 default n
9
10config 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
21config UID16
22 bool
23 default n
24
25config RWSEM_XCHGADD_ALGORITHM
26 bool
27 default y
28
Chris Zankel8e1a6dd2005-06-23 22:01:10 -070029config GENERIC_HARDIRQS
30 bool
31 default y
32
33source "init/Kconfig"
34
35menu "Processor type and features"
36
37choice
38 prompt "Xtensa Processor Configuration"
39 default XTENSA_CPU_LINUX_BE
40
41config 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
58endchoice
59
60config MMU
61 bool
62 default y
63
64config 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
73config 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
86config MATH_EMULATION
87 bool "Math emulation"
88 help
89 Can we use information of configuration file?
90
91config HIGHMEM
92 bool "High memory support"
93
94endmenu
95
96menu "Platform options"
97
98choice
99 prompt "Xtensa System Type"
100 default XTENSA_PLATFORM_ISS
101
102config XTENSA_PLATFORM_ISS
103 bool "ISS"
104 help
105 ISS is an acronym for Tensilica's Instruction Set Simulator.
106
107config 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
113endchoice
114
115
116config 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
123config XTENSA_CPU_CLOCK
124 int "CPU clock rate [MHz]"
125 depends on !XTENSA_CALIBRATE_CCOUNT
126 default "16"
127
128config GENERIC_CALIBRATE_DELAY
129 bool "Auto calibration of the BogoMIPS value"
130 ---help---
Chris Zankel82300bf2005-06-30 02:58:58 -0700131 The BogoMIPS value can easily be derived from the CPU frequency.
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700132
133config CMDLINE_BOOL
134 bool "Default bootloader kernel arguments"
135
136config 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
147config SERIAL_CONSOLE
148 bool
149 depends on XTENSA_PLATFORM_ISS
150 default y
151
152config XTENSA_ISS_NETWORK
153 bool
154 depends on XTENSA_PLATFORM_ISS
155 default y
156
Chris Zankel82300bf2005-06-30 02:58:58 -0700157source "mm/Kconfig"
158
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700159endmenu
160
161menu "Bus options"
162
163config 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
178source "drivers/pci/Kconfig"
179
180config 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
199source "drivers/pcmcia/Kconfig"
200
201source "drivers/pci/hotplug/Kconfig"
202
203endmenu
204
205menu "Exectuable file formats"
206
207# only elf supported
208config 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
223source "fs/Kconfig.binfmt"
224
225endmenu
226
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700227source "net/Kconfig"
228
Chris Zankel8e1a6dd2005-06-23 22:01:10 -0700229source "drivers/Kconfig"
230
231source "fs/Kconfig"
232
233menu "Xtensa initrd options"
234 depends on BLK_DEV_INITRD
235
236 config EMBEDDED_RAMDISK
237 bool "Embed root filesystem ramdisk into the kernel"
238
239config 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.
248endmenu
249
250source "arch/xtensa/Kconfig.debug"
251
252source "security/Kconfig"
253
254source "crypto/Kconfig"
255
256source "lib/Kconfig"
257
258