Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | # |
3 | # Character device configuration | |
4 | # | |
5 | ||
6 | menu "Character devices" | |
7 | ||
bdcffc5a | 8 | source "drivers/tty/Kconfig" |
13ae6645 | 9 | |
73f0718e RW |
10 | config DEVMEM |
11 | bool "/dev/mem virtual device support" | |
12 | default y | |
13 | help | |
14 | Say Y here if you want to support the /dev/mem device. | |
15 | The /dev/mem device is used to access areas of physical | |
16 | memory. | |
17 | When in doubt, say "Y". | |
18 | ||
b781ecb6 AV |
19 | config DEVKMEM |
20 | bool "/dev/kmem virtual device support" | |
06c35ef1 AB |
21 | # On arm64, VMALLOC_START < PAGE_OFFSET, which confuses kmem read/write |
22 | depends on !ARM64 | |
b781ecb6 AV |
23 | help |
24 | Say Y here if you want to support the /dev/kmem device. The | |
25 | /dev/kmem device is rarely used, but can be used for certain | |
26 | kind of kernel debugging operations. | |
27 | When in doubt, say "N". | |
28 | ||
1da177e4 LT |
29 | config SGI_SNSC |
30 | bool "SGI Altix system controller communication support" | |
31 | depends on (IA64_SGI_SN2 || IA64_GENERIC) | |
32 | help | |
33 | If you have an SGI Altix and you want to enable system | |
34 | controller communication from user space (you want this!), | |
35 | say Y. Otherwise, say N. | |
36 | ||
e1e19747 BL |
37 | config SGI_TIOCX |
38 | bool "SGI TIO CX driver support" | |
39 | depends on (IA64_SGI_SN2 || IA64_GENERIC) | |
40 | help | |
41 | If you have an SGI Altix and you have fpga devices attached | |
42 | to your TIO, say Y here, otherwise say N. | |
43 | ||
44 | config SGI_MBCS | |
45 | tristate "SGI FPGA Core Services driver support" | |
ae40aae9 | 46 | depends on SGI_TIOCX |
e1e19747 BL |
47 | help |
48 | If you have an SGI Altix with an attached SABrick | |
49 | say Y or M here, otherwise say N. | |
50 | ||
ab4382d2 | 51 | source "drivers/tty/serial/Kconfig" |
cd6484e1 | 52 | source "drivers/tty/serdev/Kconfig" |
1da177e4 | 53 | |
24b4b67d | 54 | config TTY_PRINTK |
b24313a8 | 55 | tristate "TTY driver to output user messages via printk" |
4f73bc4d | 56 | depends on EXPERT && TTY |
24b4b67d SP |
57 | default n |
58 | ---help--- | |
59 | If you say Y here, the support for writing user messages (i.e. | |
60 | console messages) via printk is available. | |
61 | ||
62 | The feature is useful to inline user messages with kernel | |
63 | messages. | |
64 | In order to use this feature, you should output user messages | |
65 | to /dev/ttyprintk or redirect console to this TTY. | |
66 | ||
67 | If unsure, say N. | |
68 | ||
1da177e4 LT |
69 | config PRINTER |
70 | tristate "Parallel printer support" | |
71 | depends on PARPORT | |
72 | ---help--- | |
73 | If you intend to attach a printer to the parallel port of your Linux | |
74 | box (as opposed to using a serial printer; if the connector at the | |
75 | printer has 9 or 25 holes ["female"], then it's serial), say Y. | |
76 | Also read the Printing-HOWTO, available from | |
77 | <http://www.tldp.org/docs.html#howto>. | |
78 | ||
79 | It is possible to share one parallel port among several devices | |
80 | (e.g. printer and ZIP drive) and it is safe to compile the | |
81 | corresponding drivers into the kernel. | |
82 | ||
83 | To compile this driver as a module, choose M here and read | |
5fb94e9c | 84 | <file:Documentation/admin-guide/parport.rst>. The module will be called lp. |
1da177e4 LT |
85 | |
86 | If you have several parallel ports, you can specify which ports to | |
87 | use with the "lp" kernel command line option. (Try "man bootparam" | |
88 | or see the documentation of your boot loader (lilo or loadlin) about | |
89 | how to pass options to the kernel at boot time.) The syntax of the | |
90 | "lp" command line option can be found in <file:drivers/char/lp.c>. | |
91 | ||
92 | If you have more than 8 printers, you need to increase the LP_NO | |
93 | macro in lp.c and the PARPORT_MAX macro in parport.h. | |
94 | ||
95 | config LP_CONSOLE | |
96 | bool "Support for console on line printer" | |
97 | depends on PRINTER | |
98 | ---help--- | |
99 | If you want kernel messages to be printed out as they occur, you | |
100 | can have a console on the printer. This option adds support for | |
101 | doing that; to actually get it to happen you need to pass the | |
102 | option "console=lp0" to the kernel at boot time. | |
103 | ||
104 | If the printer is out of paper (or off, or unplugged, or too | |
105 | busy..) the kernel will stall until the printer is ready again. | |
106 | By defining CONSOLE_LP_STRICT to 0 (at your own risk) you | |
107 | can make the kernel continue when this happens, | |
108 | but it'll lose the kernel messages. | |
109 | ||
110 | If unsure, say N. | |
111 | ||
112 | config PPDEV | |
113 | tristate "Support for user-space parallel port device drivers" | |
114 | depends on PARPORT | |
115 | ---help--- | |
116 | Saying Y to this adds support for /dev/parport device nodes. This | |
117 | is needed for programs that want portable access to the parallel | |
118 | port, for instance deviceid (which displays Plug-and-Play device | |
119 | IDs). | |
120 | ||
121 | This is the parallel port equivalent of SCSI generic support (sg). | |
122 | It is safe to say N to this -- it is not needed for normal printing | |
123 | or parallel port CD-ROM/disk support. | |
124 | ||
125 | To compile this driver as a module, choose M here: the | |
126 | module will be called ppdev. | |
127 | ||
128 | If unsure, say N. | |
129 | ||
bdcffc5a | 130 | source "drivers/tty/hvc/Kconfig" |
5427bcf5 | 131 | |
31610434 | 132 | config VIRTIO_CONSOLE |
7721c494 | 133 | tristate "Virtio console" |
4f73bc4d | 134 | depends on VIRTIO && TTY |
31610434 | 135 | select HVC_DRIVER |
7721c494 | 136 | help |
ecda85e7 | 137 | Virtio console for use with hypervisors. |
7721c494 | 138 | |
fb08bd27 AS |
139 | Also serves as a general-purpose serial device for data |
140 | transfer between the guest and host. Character devices at | |
141 | /dev/vportNpn will be created when corresponding ports are | |
142 | found, where N is the device number and n is the port number | |
143 | within that device. If specified by the host, a sysfs | |
144 | attribute called 'name' will be populated with a name for | |
145 | the port which can be used by udev scripts to create a | |
146 | symlink to the device. | |
31610434 | 147 | |
fe9e8d53 SR |
148 | config IBM_BSR |
149 | tristate "IBM POWER Barrier Synchronization Register support" | |
150 | depends on PPC_PSERIES | |
151 | help | |
152 | This devices exposes a hardware mechanism for fast synchronization | |
153 | of threads across a large system which avoids bouncing a cacheline | |
154 | between several cores on a system | |
155 | ||
43a1dd9b SJS |
156 | config POWERNV_OP_PANEL |
157 | tristate "IBM POWERNV Operator Panel Display support" | |
158 | depends on PPC_POWERNV | |
159 | default m | |
160 | help | |
161 | If you say Y here, a special character device node, /dev/op_panel, | |
162 | will be created which exposes the operator panel display on IBM | |
163 | Power Systems machines with FSPs. | |
164 | ||
165 | If you don't require access to the operator panel display from user | |
166 | space, say N. | |
167 | ||
168 | If unsure, say M here to build it as a module called powernv-op-panel. | |
169 | ||
1da177e4 LT |
170 | source "drivers/char/ipmi/Kconfig" |
171 | ||
1da177e4 LT |
172 | config DS1620 |
173 | tristate "NetWinder thermometer support" | |
174 | depends on ARCH_NETWINDER | |
175 | help | |
176 | Say Y here to include support for the thermal management hardware | |
177 | found in the NetWinder. This driver allows the user to control the | |
178 | temperature set points and to read the current temperature. | |
179 | ||
180 | It is also possible to say M here to build it as a module (ds1620) | |
181 | It is recommended to be used on a NetWinder, but it is not a | |
182 | necessity. | |
183 | ||
184 | config NWBUTTON | |
185 | tristate "NetWinder Button" | |
186 | depends on ARCH_NETWINDER | |
187 | ---help--- | |
188 | If you say Y here and create a character device node /dev/nwbutton | |
189 | with major and minor numbers 10 and 158 ("man mknod"), then every | |
190 | time the orange button is pressed a number of times, the number of | |
191 | times the button was pressed will be written to that device. | |
192 | ||
193 | This is most useful for applications, as yet unwritten, which | |
194 | perform actions based on how many times the button is pressed in a | |
195 | row. | |
196 | ||
197 | Do not hold the button down for too long, as the driver does not | |
198 | alter the behaviour of the hardware reset circuitry attached to the | |
199 | button; it will still execute a hard reset if the button is held | |
200 | down for longer than approximately five seconds. | |
201 | ||
202 | To compile this driver as a module, choose M here: the | |
203 | module will be called nwbutton. | |
204 | ||
205 | Most people will answer Y to this question and "Reboot Using Button" | |
206 | below to be able to initiate a system shutdown from the button. | |
207 | ||
208 | config NWBUTTON_REBOOT | |
209 | bool "Reboot Using Button" | |
210 | depends on NWBUTTON | |
211 | help | |
212 | If you say Y here, then you will be able to initiate a system | |
213 | shutdown and reboot by pressing the orange button a number of times. | |
214 | The number of presses to initiate the shutdown is two by default, | |
215 | but this can be altered by modifying the value of NUM_PRESSES_REBOOT | |
216 | in nwbutton.h and recompiling the driver or, if you compile the | |
217 | driver as a module, you can specify the number of presses at load | |
218 | time with "insmod button reboot_count=<something>". | |
219 | ||
220 | config NWFLASH | |
221 | tristate "NetWinder flash support" | |
222 | depends on ARCH_NETWINDER | |
223 | ---help--- | |
224 | If you say Y here and create a character device /dev/flash with | |
225 | major 10 and minor 160 you can manipulate the flash ROM containing | |
226 | the NetWinder firmware. Be careful as accidentally overwriting the | |
227 | flash contents can render your computer unbootable. On no account | |
228 | allow random users access to this device. :-) | |
229 | ||
230 | To compile this driver as a module, choose M here: the | |
231 | module will be called nwflash. | |
232 | ||
233 | If you're not sure, say N. | |
234 | ||
844dd05f MB |
235 | source "drivers/char/hw_random/Kconfig" |
236 | ||
1da177e4 LT |
237 | config NVRAM |
238 | tristate "/dev/nvram support" | |
3ba9faed | 239 | depends on ATARI || X86 || GENERIC_NVRAM |
1da177e4 LT |
240 | ---help--- |
241 | If you say Y here and create a character special file /dev/nvram | |
242 | with major number 10 and minor number 144 using mknod ("man mknod"), | |
243 | you get read and write access to the extra bytes of non-volatile | |
244 | memory in the real time clock (RTC), which is contained in every PC | |
245 | and most Ataris. The actual number of bytes varies, depending on the | |
246 | nvram in the system, but is usually 114 (128-14 for the RTC). | |
247 | ||
248 | This memory is conventionally called "CMOS RAM" on PCs and "NVRAM" | |
249 | on Ataris. /dev/nvram may be used to view settings there, or to | |
250 | change them (with some utility). It could also be used to frequently | |
251 | save a few bits of very important data that may not be lost over | |
252 | power-off and for which writing to disk is too insecure. Note | |
253 | however that most NVRAM space in a PC belongs to the BIOS and you | |
254 | should NEVER idly tamper with it. See Ralf Brown's interrupt list | |
255 | for a guide to the use of CMOS bytes by your BIOS. | |
256 | ||
257 | On Atari machines, /dev/nvram is always configured and does not need | |
258 | to be selected. | |
259 | ||
260 | To compile this driver as a module, choose M here: the | |
261 | module will be called nvram. | |
262 | ||
c7500900 DB |
263 | # |
264 | # These legacy RTC drivers just cause too many conflicts with the generic | |
265 | # RTC framework ... let's not even try to coexist any more. | |
266 | # | |
267 | if RTC_LIB=n | |
268 | ||
1da177e4 | 269 | config RTC |
e6d2bb2b | 270 | tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)" |
5ee98ab3 | 271 | depends on ALPHA || (MIPS && MACH_LOONGSON64) |
1da177e4 LT |
272 | ---help--- |
273 | If you say Y here and create a character special file /dev/rtc with | |
274 | major number 10 and minor number 135 using mknod ("man mknod"), you | |
275 | will get access to the real time clock (or hardware clock) built | |
276 | into your computer. | |
277 | ||
278 | Every PC has such a clock built in. It can be used to generate | |
279 | signals from as low as 1Hz up to 8192Hz, and can also be used | |
280 | as a 24 hour alarm. It reports status information via the file | |
281 | /proc/driver/rtc and its behaviour is set by various ioctls on | |
282 | /dev/rtc. | |
283 | ||
284 | If you run Linux on a multiprocessor machine and said Y to | |
285 | "Symmetric Multi Processing" above, you should say Y here to read | |
286 | and set the RTC in an SMP compatible fashion. | |
287 | ||
288 | If you think you have a use for such a device (such as periodic data | |
289 | sampling), then say Y here, and read <file:Documentation/rtc.txt> | |
290 | for details. | |
291 | ||
292 | To compile this driver as a module, choose M here: the | |
293 | module will be called rtc. | |
294 | ||
2240598c AV |
295 | config JS_RTC |
296 | tristate "Enhanced Real Time Clock Support" | |
297 | depends on SPARC32 && PCI | |
298 | ---help--- | |
299 | If you say Y here and create a character special file /dev/rtc with | |
300 | major number 10 and minor number 135 using mknod ("man mknod"), you | |
301 | will get access to the real time clock (or hardware clock) built | |
302 | into your computer. | |
303 | ||
304 | Every PC has such a clock built in. It can be used to generate | |
305 | signals from as low as 1Hz up to 8192Hz, and can also be used | |
306 | as a 24 hour alarm. It reports status information via the file | |
307 | /proc/driver/rtc and its behaviour is set by various ioctls on | |
308 | /dev/rtc. | |
309 | ||
310 | If you think you have a use for such a device (such as periodic data | |
311 | sampling), then say Y here, and read <file:Documentation/rtc.txt> | |
312 | for details. | |
313 | ||
314 | To compile this driver as a module, choose M here: the | |
315 | module will be called js-rtc. | |
316 | ||
1da177e4 LT |
317 | config EFI_RTC |
318 | bool "EFI Real Time Clock Services" | |
319 | depends on IA64 | |
320 | ||
c7500900 DB |
321 | endif # RTC_LIB |
322 | ||
1da177e4 LT |
323 | config DTLK |
324 | tristate "Double Talk PC internal speech card support" | |
eeca7a36 | 325 | depends on ISA |
1da177e4 LT |
326 | help |
327 | This driver is for the DoubleTalk PC, a speech synthesizer | |
328 | manufactured by RC Systems (<http://www.rcsys.com/>). It is also | |
329 | called the `internal DoubleTalk'. | |
330 | ||
331 | To compile this driver as a module, choose M here: the | |
332 | module will be called dtlk. | |
333 | ||
ef141a0b SN |
334 | config XILINX_HWICAP |
335 | tristate "Xilinx HWICAP Support" | |
6fa612b5 | 336 | depends on XILINX_VIRTEX || MICROBLAZE |
ef141a0b SN |
337 | help |
338 | This option enables support for Xilinx Internal Configuration | |
339 | Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex | |
340 | FPGA platforms to partially reconfigure the FPGA at runtime. | |
341 | ||
342 | If unsure, say N. | |
343 | ||
1da177e4 LT |
344 | config R3964 |
345 | tristate "Siemens R3964 line discipline" | |
4f73bc4d | 346 | depends on TTY |
1da177e4 LT |
347 | ---help--- |
348 | This driver allows synchronous communication with devices using the | |
349 | Siemens R3964 packet protocol. Unless you are dealing with special | |
350 | hardware like PLCs, you are unlikely to need this. | |
351 | ||
352 | To compile this driver as a module, choose M here: the | |
353 | module will be called n_r3964. | |
354 | ||
355 | If unsure, say N. | |
356 | ||
357 | config APPLICOM | |
358 | tristate "Applicom intelligent fieldbus card support" | |
359 | depends on PCI | |
360 | ---help--- | |
361 | This driver provides the kernel-side support for the intelligent | |
362 | fieldbus cards made by Applicom International. More information | |
363 | about these cards can be found on the WWW at the address | |
364 | <http://www.applicom-int.com/>, or by email from David Woodhouse | |
365 | <dwmw2@infradead.org>. | |
366 | ||
367 | To compile this driver as a module, choose M here: the | |
368 | module will be called applicom. | |
369 | ||
370 | If unsure, say N. | |
371 | ||
372 | config SONYPI | |
65929215 | 373 | tristate "Sony Vaio Programmable I/O Control Device support" |
57dcf020 | 374 | depends on X86_32 && PCI && INPUT |
1da177e4 LT |
375 | ---help--- |
376 | This driver enables access to the Sony Programmable I/O Control | |
377 | Device which can be found in many (all ?) Sony Vaio laptops. | |
378 | ||
379 | If you have one of those laptops, read | |
018a651a | 380 | <file:Documentation/laptops/sonypi.txt>, and say Y or M here. |
1da177e4 LT |
381 | |
382 | To compile this driver as a module, choose M here: the | |
383 | module will be called sonypi. | |
384 | ||
09762516 YY |
385 | config GPIO_TB0219 |
386 | tristate "TANBAC TB0219 GPIO support" | |
bef1f402 | 387 | depends on TANBAC_TB022X |
584e1236 | 388 | select GPIO_VR41XX |
1da177e4 | 389 | |
1da177e4 LT |
390 | source "drivers/char/pcmcia/Kconfig" |
391 | ||
392 | config MWAVE | |
393 | tristate "ACP Modem (Mwave) support" | |
4f73bc4d | 394 | depends on X86 && TTY |
1da177e4 LT |
395 | select SERIAL_8250 |
396 | ---help--- | |
397 | The ACP modem (Mwave) for Linux is a WinModem. It is composed of a | |
398 | kernel driver and a user level application. Together these components | |
399 | support direct attachment to public switched telephone networks (PSTNs) | |
400 | and support selected world wide countries. | |
401 | ||
402 | This version of the ACP Modem driver supports the IBM Thinkpad 600E, | |
403 | 600, and 770 that include on board ACP modem hardware. | |
404 | ||
405 | The modem also supports the standard communications port interface | |
406 | (ttySx) and is compatible with the Hayes AT Command Set. | |
407 | ||
408 | The user level application needed to use this driver can be found at | |
409 | the IBM Linux Technology Center (LTC) web site: | |
410 | <http://www.ibm.com/linux/ltc/>. | |
411 | ||
412 | If you own one of the above IBM Thinkpads which has the Mwave chipset | |
413 | in it, say Y. | |
414 | ||
415 | To compile this driver as a module, choose M here: the | |
416 | module will be called mwave. | |
417 | ||
418 | config SCx200_GPIO | |
419 | tristate "NatSemi SCx200 GPIO Support" | |
420 | depends on SCx200 | |
7a8e2a5e | 421 | select NSC_GPIO |
1da177e4 LT |
422 | help |
423 | Give userspace access to the GPIO pins on the National | |
424 | Semiconductor SCx200 processors. | |
425 | ||
426 | If compiled as a module, it will be called scx200_gpio. | |
427 | ||
7a8e2a5e JC |
428 | config PC8736x_GPIO |
429 | tristate "NatSemi PC8736x GPIO Support" | |
3369465e | 430 | depends on X86_32 && !UML |
7a8e2a5e JC |
431 | default SCx200_GPIO # mostly N |
432 | select NSC_GPIO # needed for support routines | |
433 | help | |
434 | Give userspace access to the GPIO pins on the National | |
435 | Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip | |
436 | has multiple functional units, inc several managed by | |
437 | hwmon/pc87360 driver. Tested with PC-87366 | |
438 | ||
439 | If compiled as a module, it will be called pc8736x_gpio. | |
440 | ||
441 | config NSC_GPIO | |
442 | tristate "NatSemi Base GPIO Support" | |
699352c3 | 443 | depends on X86_32 |
7a8e2a5e JC |
444 | # selected by SCx200_GPIO and PC8736x_GPIO |
445 | # what about 2 selectors differing: m != y | |
446 | help | |
447 | Common support used (and needed) by scx200_gpio and | |
448 | pc8736x_gpio drivers. If those drivers are built as | |
449 | modules, this one will be too, named nsc_gpio | |
450 | ||
1da177e4 | 451 | config RAW_DRIVER |
abd4aa5a | 452 | tristate "RAW driver (/dev/raw/rawN)" |
9361401e | 453 | depends on BLOCK |
1da177e4 | 454 | help |
abd4aa5a DJ |
455 | The raw driver permits block devices to be bound to /dev/raw/rawN. |
456 | Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O. | |
1da177e4 LT |
457 | See the raw(8) manpage for more details. |
458 | ||
abd4aa5a | 459 | Applications should preferably open the device (eg /dev/hda1) |
1da177e4 LT |
460 | with the O_DIRECT flag. |
461 | ||
0de502aa | 462 | config MAX_RAW_DEVS |
0078bff5 | 463 | int "Maximum number of RAW devices to support (1-65536)" |
0de502aa | 464 | depends on RAW_DRIVER |
7143479a | 465 | range 1 65536 |
0de502aa AM |
466 | default "256" |
467 | help | |
468 | The maximum number of RAW devices that are supported. | |
469 | Default is 256. Increase this number in case you need lots of | |
470 | raw devices. | |
471 | ||
1da177e4 LT |
472 | config HPET |
473 | bool "HPET - High Precision Event Timer" if (X86 || IA64) | |
474 | default n | |
475 | depends on ACPI | |
476 | help | |
477 | If you say Y here, you will have a miscdevice named "/dev/hpet/". Each | |
478 | open selects one of the timers supported by the HPET. The timers are | |
3cb2fccc | 479 | non-periodic and/or periodic. |
1da177e4 | 480 | |
1da177e4 LT |
481 | config HPET_MMAP |
482 | bool "Allow mmap of HPET" | |
483 | default y | |
484 | depends on HPET | |
485 | help | |
486 | If you say Y here, user applications will be able to mmap | |
487 | the HPET registers. | |
488 | ||
3d035f58 PB |
489 | config HPET_MMAP_DEFAULT |
490 | bool "Enable HPET MMAP access by default" | |
491 | default y | |
492 | depends on HPET_MMAP | |
493 | help | |
1da177e4 LT |
494 | In some hardware implementations, the page containing HPET |
495 | registers may also contain other things that shouldn't be | |
3d035f58 PB |
496 | exposed to the user. This option selects the default (if |
497 | kernel parameter hpet_mmap is not set) user access to the | |
498 | registers for applications that require it. | |
1da177e4 | 499 | |
1da177e4 LT |
500 | config HANGCHECK_TIMER |
501 | tristate "Hangcheck timer" | |
abf3ea1b | 502 | depends on X86 || IA64 || PPC64 || S390 |
1da177e4 LT |
503 | help |
504 | The hangcheck-timer module detects when the system has gone | |
505 | out to lunch past a certain margin. It can reboot the system | |
506 | or merely print a warning. | |
507 | ||
fbd8ae10 DS |
508 | config UV_MMTIMER |
509 | tristate "UV_MMTIMER Memory mapped RTC for SGI UV" | |
510 | depends on X86_UV | |
511 | default m | |
512 | help | |
513 | The uv_mmtimer device allows direct userspace access to the | |
514 | UV system timer. | |
515 | ||
1da177e4 LT |
516 | source "drivers/char/tpm/Kconfig" |
517 | ||
1a80ba88 | 518 | config TELCLOCK |
03154a27 | 519 | tristate "Telecom clock driver for ATCA SBC" |
65929215 | 520 | depends on X86 |
1a80ba88 MG |
521 | default n |
522 | help | |
03154a27 MG |
523 | The telecom clock device is specific to the MPCBL0010 and MPCBL0050 |
524 | ATCA computers and allows direct userspace access to the | |
525 | configuration of the telecom clock configuration settings. This | |
526 | device is used for hardware synchronization across the ATCA backplane | |
527 | fabric. Upon loading, the driver exports a sysfs directory, | |
528 | /sys/devices/platform/telco_clock, with a number of files for | |
529 | controlling the behavior of this hardware. | |
1a80ba88 | 530 | |
4f911d64 | 531 | config DEVPORT |
f2cfa58b | 532 | bool "/dev/port character device" |
4f911d64 RK |
533 | depends on ISA || PCI |
534 | default y | |
f2cfa58b MB |
535 | help |
536 | Say Y here if you want to support the /dev/port device. The /dev/port | |
537 | device is similar to /dev/mem, but for I/O ports. | |
4f911d64 | 538 | |
61d48c2c MS |
539 | source "drivers/s390/char/Kconfig" |
540 | ||
7051924f EB |
541 | source "drivers/char/xillybus/Kconfig" |
542 | ||
873c38a4 TH |
543 | config ADI |
544 | tristate "SPARC Privileged ADI driver" | |
545 | depends on SPARC64 | |
546 | default m | |
547 | help | |
548 | SPARC M7 and newer processors utilize ADI (Application Data | |
549 | Integrity) to version and protect memory. This driver provides | |
550 | read/write access to the ADI versions for privileged processes. | |
551 | This feature is also known as MCD (Memory Corruption Detection) | |
552 | and SSM (Silicon Secured Memory). Intended consumers of this | |
553 | driver include crash and makedumpfile. | |
554 | ||
1da177e4 LT |
555 | endmenu |
556 | ||
39a8883a TT |
557 | config RANDOM_TRUST_CPU |
558 | bool "Trust the CPU manufacturer to initialize Linux's CRNG" | |
559 | depends on X86 || S390 || PPC | |
560 | default n | |
561 | help | |
562 | Assume that CPU manufacturer (e.g., Intel or AMD for RDSEED or | |
563 | RDRAND, IBM for the S390 and Power PC architectures) is trustworthy | |
564 | for the purposes of initializing Linux's CRNG. Since this is not | |
565 | something that can be independently audited, this amounts to trusting | |
566 | that CPU manufacturer (perhaps with the insistence or mandate | |
567 | of a Nation State's intelligence or law enforcement agencies) | |
568 | has not installed a hidden back door to compromise the CPU's | |
569 | random number generation facilities. | |
570 |