2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
32 # 9 = 512 pages 8 = 256 pages 7 = 128 pages
33 config FORCE_MAX_ZONEORDER
41 config RWSEM_GENERIC_SPINLOCK
45 config RWSEM_XCHGADD_ALGORITHM
48 config GENERIC_BUST_SPINLOCK
51 config GENERIC_ISA_DMA
59 comment "Archimedes/A5000 Implementations (select only ONE)"
64 Say Y to support the Acorn Archimedes.
66 The Acorn Archimedes was an personal computer based on an 8MHz ARM2
67 processor, released in 1987. It supported up to 16MB of RAM in
68 later models and floppy, harddisc, ethernet etc.
73 Say Y here to to support the Acorn A5000.
76 internal IDE disk and CD-ROM interface, serial and parallel port,
77 and the floppy drive. Note that on some A5000s the floppy is
78 plugged into the wrong socket on the motherboard.
81 bool "2MB physical memory (broken)"
83 Say Y here if your Archimedes or A5000 system has only 2MB of
84 memory, otherwise say N. The resulting kernel will not run on a
85 machine with 4MB of memory.
90 # Compressed boot loader in ROM. Yes, we really want to ask about
91 # TEXT and BSS so we preserve their values in the config files.
93 bool "Compressed boot loader in ROM/flash"
95 Say Y here if you intend to execute your compressed kernel image (zImage)
96 directly from ROM or flash. If unsure, say N.
99 hex "Compressed ROM boot loader base address"
102 The base address for zImage. Unless you have special requirements, you
103 should not change this value.
106 hex "Compressed ROM boot loader BSS address"
109 The base address of 64KiB of read/write memory, which must be available
110 while the decompressor is running. Unless you have special requirements,
111 you should not change this value.
114 bool "Support for hot-pluggable devices"
116 Say Y here if you want to plug devices into your computer while
117 the system is running, and be able to use them quickly. In many
118 cases, the devices can likewise be unplugged at any time too.
120 One well known example of this is PCMCIA- or PC-cards, credit-card
121 size devices such as network cards, modems or hard drives which are
122 plugged into slots found on all modern laptop computers. Another
123 example, used on modern desktops as well as laptops, is USB.
125 Enable HOTPLUG and KMOD, and build a modular kernel. Get agent
126 software (at <http://linux-hotplug.sourceforge.net/>) and install it.
127 Then your kernel will automatically call out to a user mode "policy
128 agent" (/sbin/hotplug) to load modules and set up software needed
129 to use devices as you hotplug them.
131 comment "At least one math emulation must be selected"
134 tristate "NWFPE math emulation"
136 Say Y to include the NWFPE floating point emulator in the kernel.
137 This is necessary to run most binaries. Linux does not currently
138 support floating point hardware so you need to say Y here even if
139 your machine has an FPA or floating point co-processor podule.
141 It is also possible to say M to build the emulator as a module
142 (nwfpe) or indeed to leave it out altogether. However, unless you
143 know what you are doing this can easily render your machine
144 unbootable. Saying Y is the safe option.
146 You may say N here if you are going to load the Acorn FPEmulator
150 prompt "Kernel core (/proc/kcore) format"
156 If you enabled support for /proc file system then the file
157 /proc/kcore will contain the kernel core image. This can be used
160 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
162 You have two choices here: ELF and A.OUT. Selecting ELF will make
163 /proc/kcore appear in ELF core format as defined by the Executable
164 and Linking Format specification. Selecting A.OUT will choose the
165 old "a.out" format which may be necessary for some old versions
166 of binutils or on some architectures.
168 This is especially useful if you have compiled the kernel with the
169 "-g" option to preserve debugging information. It is mainly used
170 for examining kernel data structures on the live kernel so if you
171 don't understand what this means or are not a kernel hacker, just
172 leave it at its default value ELF.
177 Not necessary unless you're using a very out-of-date binutils
178 version. You probably want KCORE_ELF.
182 source "fs/Kconfig.binfmt"
185 bool "Preemptible Kernel (EXPERIMENTAL)"
186 depends on CPU_32 && EXPERIMENTAL
188 This option reduces the latency of the kernel when reacting to
189 real-time or interactive events by allowing a low priority process to
190 be preempted even if it is in kernel mode executing a system call.
191 This allows applications to run more reliably even when the system is
194 Say Y here if you are building a kernel for a desktop, embedded
195 or real-time system. Say N if you are unsure.
198 tristate "RISC OS personality"
201 Say Y here to include the kernel code necessary if you want to run
202 Acorn RISC OS/Arthur binaries under Linux. This code is still very
203 experimental; if this sounds frightening, say N and sleep in peace.
204 You can also say M here to compile this support as a module (which
205 will be called arthur).
208 string "Default kernel command string"
211 On some architectures (EBSA110 and CATS), there is currently no way
212 for the boot loader to pass arguments to the kernel. For these
213 architectures, you should supply some command-line options at build
214 time by entering them here. As a minimum, you should specify the
215 memory size and the root device (e.g., mem=64M root=/dev/nfs).
219 source "drivers/base/Kconfig"
221 source "drivers/parport/Kconfig"
223 source "drivers/pnp/Kconfig"
225 source "drivers/block/Kconfig"
227 source "drivers/md/Kconfig"
231 source "net/irda/Kconfig"
233 source "drivers/ide/Kconfig"
235 source "drivers/scsi/Kconfig"
237 source "drivers/isdn/Kconfig"
240 # input before char - char/joystick depends on it. As does USB.
242 source "drivers/input/Kconfig"
244 source "drivers/char/Kconfig"
248 depends on ARCH_ACORN && BUSMOUSE=y
251 source "drivers/media/Kconfig"
255 source "drivers/video/Kconfig"
258 depends on ARCH_ACORN
261 tristate "Sound card support"
263 If you have a sound card in your computer, i.e. if it can say more
264 than an occasional beep, say Y. Be sure to have all the information
265 about your sound card and its configuration down (I/O port,
266 interrupt and DMA channel), because you will be asked for it.
268 You want to read the Sound-HOWTO, available from
269 <http://www.linuxdoc.org/docs.html#howto>. General information about
270 the modular sound system is contained in the files
271 <file:Documentation/sound/Introduction>. The file
272 <file:Documentation/sound/README.OSS> contains some slightly
273 outdated but still useful information as well.
275 If you have a PnP sound card and you want to configure it at boot
276 time using the ISA PnP tools (read
277 <http://www.roestock.demon.co.uk/isapnptools/>), then you need to
278 compile the sound card support as a module ( = code which can be
279 inserted in and removed from the running kernel whenever you want)
280 and load that module after the PnP configuration is finished. To do
281 this, say M here and read <file:Documentation/modules.txt> as well
282 as <file:Documentation/sound/README.modules>; the module will be
285 I'm told that even without a sound card, you can make your computer
286 say more than an occasional beep, by programming the PC speaker.
287 Kernel patches and supporting utilities to do that are in the pcsp
288 package, available at <ftp://ftp.infradead.org/pub/pcsp/>.
290 source "sound/Kconfig"
294 source "drivers/misc/Kconfig"
296 source "drivers/usb/Kconfig"
298 source "net/bluetooth/Kconfig"
301 menu "Kernel hacking"
303 # RMK wants arm kernels compiled with frame pointers so hardwire this to y.
304 # If you know what you are doing and are willing to live without stack
305 # traces, you can get a slightly smaller kernel by setting this option to
306 # n, but then RMK will have to kill you ;).
311 If you say N here, the resulting kernel will be slightly smaller and
312 faster. However, when a problem occurs with the kernel, the
313 information that is reported is severely limited. Most people
317 bool "Verbose user fault messages"
319 When a user program crashes due to an exception, the kernel can
320 print a brief message explaining what the problem was. This is
321 sometimes helpful for debugging but serves no purpose on a
322 production system. Most people should say N here.
325 bool "Include GDB debugging information in kernel binary"
327 Say Y here to include source-level debugging information in the
328 `vmlinux' binary image. This is handy if you want to use gdb or
329 addr2line to debug the kernel. It has no impact on the in-memory
330 footprint of the running kernel but it can increase the amount of
331 time and disk space needed for compilation of the kernel. If in
335 bool "Kernel debugging"
337 Say Y here if you are developing drivers or trying to debug and
338 identify kernel problems.
341 bool "Debug memory allocations"
342 depends on DEBUG_KERNEL
344 Say Y here to have the kernel do limited verification on memory
345 allocation as well as poisoning memory on free to catch use of freed
349 bool "Magic SysRq key"
350 depends on DEBUG_KERNEL
352 If you say Y here, you will have some control over the system even
353 if the system crashes for example during kernel debugging (e.g., you
354 will be able to flush the buffer cache to disk, reboot the system
355 immediately or dump some status information). This is accomplished
356 by pressing various keys while holding SysRq (Alt+PrintScreen). It
357 also works on a serial console (on PC hardware at least), if you
358 send a BREAK and then within 5 seconds a command keypress. The
359 keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
360 unless you really know what this hack does.
362 config DEBUG_SPINLOCK
363 bool "Spinlock debugging"
364 depends on DEBUG_KERNEL
366 Say Y here and build SMP to catch missing spinlock initialization
367 and certain other kinds of spinlock errors commonly made. This is
368 best used in conjunction with the NMI watchdog so that spinlock
369 deadlocks are also debuggable.
372 bool "Wait queue debugging"
373 depends on DEBUG_KERNEL
375 config DEBUG_BUGVERBOSE
376 bool "Verbose BUG() reporting (adds 70K)"
377 depends on DEBUG_KERNEL
379 Say Y here to make BUG() panics output the file name and line number
380 of the BUG call as well as the EIP and oops trace. This aids
381 debugging but costs about 70-100K of memory.
384 bool "Verbose kernel error messages"
385 depends on DEBUG_KERNEL
387 This option controls verbose debugging information which can be
388 printed when the kernel detects an internal error. This debugging
389 information is useful to kernel hackers when tracking down problems,
390 but mostly meaningless to other people. It's safe to say Y unless
391 you are concerned with the code size or don't want to see these
394 # These options are only for real kernel hackers who want to get their hands dirty.
396 bool "Kernel low-level debugging functions"
397 depends on DEBUG_KERNEL
399 Say Y here to include definitions of printascii, printchar, printhex
400 in the kernel. This is helpful if you are debugging code that
401 executes before the console is initialized.
405 source "security/Kconfig"
407 source "crypto/Kconfig"