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Commit | Line | Data |
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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 | ||
acef6660 PK |
69 | config TTY_PRINTK_LEVEL |
70 | depends on TTY_PRINTK | |
71 | int "ttyprintk log level (1-7)" | |
72 | range 1 7 | |
73 | default "6" | |
74 | help | |
75 | Printk log level to use for ttyprintk messages. | |
76 | ||
1da177e4 LT |
77 | config PRINTER |
78 | tristate "Parallel printer support" | |
79 | depends on PARPORT | |
80 | ---help--- | |
81 | If you intend to attach a printer to the parallel port of your Linux | |
82 | box (as opposed to using a serial printer; if the connector at the | |
83 | printer has 9 or 25 holes ["female"], then it's serial), say Y. | |
84 | Also read the Printing-HOWTO, available from | |
85 | <http://www.tldp.org/docs.html#howto>. | |
86 | ||
87 | It is possible to share one parallel port among several devices | |
88 | (e.g. printer and ZIP drive) and it is safe to compile the | |
89 | corresponding drivers into the kernel. | |
90 | ||
91 | To compile this driver as a module, choose M here and read | |
5fb94e9c | 92 | <file:Documentation/admin-guide/parport.rst>. The module will be called lp. |
1da177e4 LT |
93 | |
94 | If you have several parallel ports, you can specify which ports to | |
95 | use with the "lp" kernel command line option. (Try "man bootparam" | |
96 | or see the documentation of your boot loader (lilo or loadlin) about | |
97 | how to pass options to the kernel at boot time.) The syntax of the | |
98 | "lp" command line option can be found in <file:drivers/char/lp.c>. | |
99 | ||
100 | If you have more than 8 printers, you need to increase the LP_NO | |
101 | macro in lp.c and the PARPORT_MAX macro in parport.h. | |
102 | ||
103 | config LP_CONSOLE | |
104 | bool "Support for console on line printer" | |
105 | depends on PRINTER | |
106 | ---help--- | |
107 | If you want kernel messages to be printed out as they occur, you | |
108 | can have a console on the printer. This option adds support for | |
109 | doing that; to actually get it to happen you need to pass the | |
110 | option "console=lp0" to the kernel at boot time. | |
111 | ||
112 | If the printer is out of paper (or off, or unplugged, or too | |
113 | busy..) the kernel will stall until the printer is ready again. | |
114 | By defining CONSOLE_LP_STRICT to 0 (at your own risk) you | |
115 | can make the kernel continue when this happens, | |
116 | but it'll lose the kernel messages. | |
117 | ||
118 | If unsure, say N. | |
119 | ||
120 | config PPDEV | |
121 | tristate "Support for user-space parallel port device drivers" | |
122 | depends on PARPORT | |
123 | ---help--- | |
124 | Saying Y to this adds support for /dev/parport device nodes. This | |
125 | is needed for programs that want portable access to the parallel | |
126 | port, for instance deviceid (which displays Plug-and-Play device | |
127 | IDs). | |
128 | ||
129 | This is the parallel port equivalent of SCSI generic support (sg). | |
130 | It is safe to say N to this -- it is not needed for normal printing | |
131 | or parallel port CD-ROM/disk support. | |
132 | ||
133 | To compile this driver as a module, choose M here: the | |
134 | module will be called ppdev. | |
135 | ||
136 | If unsure, say N. | |
137 | ||
bdcffc5a | 138 | source "drivers/tty/hvc/Kconfig" |
5427bcf5 | 139 | |
31610434 | 140 | config VIRTIO_CONSOLE |
7721c494 | 141 | tristate "Virtio console" |
4f73bc4d | 142 | depends on VIRTIO && TTY |
31610434 | 143 | select HVC_DRIVER |
7721c494 | 144 | help |
ecda85e7 | 145 | Virtio console for use with hypervisors. |
7721c494 | 146 | |
fb08bd27 AS |
147 | Also serves as a general-purpose serial device for data |
148 | transfer between the guest and host. Character devices at | |
149 | /dev/vportNpn will be created when corresponding ports are | |
150 | found, where N is the device number and n is the port number | |
151 | within that device. If specified by the host, a sysfs | |
152 | attribute called 'name' will be populated with a name for | |
153 | the port which can be used by udev scripts to create a | |
154 | symlink to the device. | |
31610434 | 155 | |
fe9e8d53 SR |
156 | config IBM_BSR |
157 | tristate "IBM POWER Barrier Synchronization Register support" | |
158 | depends on PPC_PSERIES | |
159 | help | |
160 | This devices exposes a hardware mechanism for fast synchronization | |
161 | of threads across a large system which avoids bouncing a cacheline | |
162 | between several cores on a system | |
163 | ||
43a1dd9b SJS |
164 | config POWERNV_OP_PANEL |
165 | tristate "IBM POWERNV Operator Panel Display support" | |
166 | depends on PPC_POWERNV | |
167 | default m | |
168 | help | |
169 | If you say Y here, a special character device node, /dev/op_panel, | |
170 | will be created which exposes the operator panel display on IBM | |
171 | Power Systems machines with FSPs. | |
172 | ||
173 | If you don't require access to the operator panel display from user | |
174 | space, say N. | |
175 | ||
176 | If unsure, say M here to build it as a module called powernv-op-panel. | |
177 | ||
1da177e4 LT |
178 | source "drivers/char/ipmi/Kconfig" |
179 | ||
1da177e4 LT |
180 | config DS1620 |
181 | tristate "NetWinder thermometer support" | |
182 | depends on ARCH_NETWINDER | |
183 | help | |
184 | Say Y here to include support for the thermal management hardware | |
185 | found in the NetWinder. This driver allows the user to control the | |
186 | temperature set points and to read the current temperature. | |
187 | ||
188 | It is also possible to say M here to build it as a module (ds1620) | |
189 | It is recommended to be used on a NetWinder, but it is not a | |
190 | necessity. | |
191 | ||
192 | config NWBUTTON | |
193 | tristate "NetWinder Button" | |
194 | depends on ARCH_NETWINDER | |
195 | ---help--- | |
196 | If you say Y here and create a character device node /dev/nwbutton | |
197 | with major and minor numbers 10 and 158 ("man mknod"), then every | |
198 | time the orange button is pressed a number of times, the number of | |
199 | times the button was pressed will be written to that device. | |
200 | ||
201 | This is most useful for applications, as yet unwritten, which | |
202 | perform actions based on how many times the button is pressed in a | |
203 | row. | |
204 | ||
205 | Do not hold the button down for too long, as the driver does not | |
206 | alter the behaviour of the hardware reset circuitry attached to the | |
207 | button; it will still execute a hard reset if the button is held | |
208 | down for longer than approximately five seconds. | |
209 | ||
210 | To compile this driver as a module, choose M here: the | |
211 | module will be called nwbutton. | |
212 | ||
213 | Most people will answer Y to this question and "Reboot Using Button" | |
214 | below to be able to initiate a system shutdown from the button. | |
215 | ||
216 | config NWBUTTON_REBOOT | |
217 | bool "Reboot Using Button" | |
218 | depends on NWBUTTON | |
219 | help | |
220 | If you say Y here, then you will be able to initiate a system | |
221 | shutdown and reboot by pressing the orange button a number of times. | |
222 | The number of presses to initiate the shutdown is two by default, | |
223 | but this can be altered by modifying the value of NUM_PRESSES_REBOOT | |
224 | in nwbutton.h and recompiling the driver or, if you compile the | |
225 | driver as a module, you can specify the number of presses at load | |
226 | time with "insmod button reboot_count=<something>". | |
227 | ||
228 | config NWFLASH | |
229 | tristate "NetWinder flash support" | |
230 | depends on ARCH_NETWINDER | |
231 | ---help--- | |
232 | If you say Y here and create a character device /dev/flash with | |
233 | major 10 and minor 160 you can manipulate the flash ROM containing | |
234 | the NetWinder firmware. Be careful as accidentally overwriting the | |
235 | flash contents can render your computer unbootable. On no account | |
236 | allow random users access to this device. :-) | |
237 | ||
238 | To compile this driver as a module, choose M here: the | |
239 | module will be called nwflash. | |
240 | ||
241 | If you're not sure, say N. | |
242 | ||
844dd05f MB |
243 | source "drivers/char/hw_random/Kconfig" |
244 | ||
1da177e4 LT |
245 | config NVRAM |
246 | tristate "/dev/nvram support" | |
f9c3a570 FT |
247 | depends on X86 || HAVE_ARCH_NVRAM_OPS |
248 | default M68K || PPC | |
1da177e4 LT |
249 | ---help--- |
250 | If you say Y here and create a character special file /dev/nvram | |
251 | with major number 10 and minor number 144 using mknod ("man mknod"), | |
f9c3a570 FT |
252 | you get read and write access to the non-volatile memory. |
253 | ||
254 | /dev/nvram may be used to view settings in NVRAM or to change them | |
255 | (with some utility). It could also be used to frequently | |
1da177e4 LT |
256 | save a few bits of very important data that may not be lost over |
257 | power-off and for which writing to disk is too insecure. Note | |
258 | however that most NVRAM space in a PC belongs to the BIOS and you | |
259 | should NEVER idly tamper with it. See Ralf Brown's interrupt list | |
260 | for a guide to the use of CMOS bytes by your BIOS. | |
261 | ||
f9c3a570 FT |
262 | This memory is conventionally called "NVRAM" on PowerPC machines, |
263 | "CMOS RAM" on PCs, "NVRAM" on Ataris and "PRAM" on Macintoshes. | |
264 | ||
1da177e4 LT |
265 | To compile this driver as a module, choose M here: the |
266 | module will be called nvram. | |
267 | ||
c7500900 DB |
268 | # |
269 | # These legacy RTC drivers just cause too many conflicts with the generic | |
270 | # RTC framework ... let's not even try to coexist any more. | |
271 | # | |
272 | if RTC_LIB=n | |
273 | ||
1da177e4 | 274 | config RTC |
e6d2bb2b | 275 | tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)" |
05a0a344 | 276 | depends on ALPHA |
1da177e4 LT |
277 | ---help--- |
278 | If you say Y here and create a character special file /dev/rtc with | |
279 | major number 10 and minor number 135 using mknod ("man mknod"), you | |
280 | will get access to the real time clock (or hardware clock) built | |
281 | into your computer. | |
282 | ||
283 | Every PC has such a clock built in. It can be used to generate | |
284 | signals from as low as 1Hz up to 8192Hz, and can also be used | |
285 | as a 24 hour alarm. It reports status information via the file | |
286 | /proc/driver/rtc and its behaviour is set by various ioctls on | |
287 | /dev/rtc. | |
288 | ||
289 | If you run Linux on a multiprocessor machine and said Y to | |
290 | "Symmetric Multi Processing" above, you should say Y here to read | |
291 | and set the RTC in an SMP compatible fashion. | |
292 | ||
293 | If you think you have a use for such a device (such as periodic data | |
4f4cfa6c | 294 | sampling), then say Y here, and read <file:Documentation/admin-guide/rtc.rst> |
1da177e4 LT |
295 | for details. |
296 | ||
297 | To compile this driver as a module, choose M here: the | |
298 | module will be called rtc. | |
299 | ||
2240598c AV |
300 | config JS_RTC |
301 | tristate "Enhanced Real Time Clock Support" | |
302 | depends on SPARC32 && PCI | |
303 | ---help--- | |
304 | If you say Y here and create a character special file /dev/rtc with | |
305 | major number 10 and minor number 135 using mknod ("man mknod"), you | |
306 | will get access to the real time clock (or hardware clock) built | |
307 | into your computer. | |
308 | ||
309 | Every PC has such a clock built in. It can be used to generate | |
310 | signals from as low as 1Hz up to 8192Hz, and can also be used | |
311 | as a 24 hour alarm. It reports status information via the file | |
312 | /proc/driver/rtc and its behaviour is set by various ioctls on | |
313 | /dev/rtc. | |
314 | ||
315 | If you think you have a use for such a device (such as periodic data | |
4f4cfa6c | 316 | sampling), then say Y here, and read <file:Documentation/admin-guide/rtc.rst> |
2240598c AV |
317 | for details. |
318 | ||
319 | To compile this driver as a module, choose M here: the | |
320 | module will be called js-rtc. | |
321 | ||
1da177e4 LT |
322 | config EFI_RTC |
323 | bool "EFI Real Time Clock Services" | |
324 | depends on IA64 | |
325 | ||
c7500900 DB |
326 | endif # RTC_LIB |
327 | ||
1da177e4 LT |
328 | config DTLK |
329 | tristate "Double Talk PC internal speech card support" | |
eeca7a36 | 330 | depends on ISA |
1da177e4 LT |
331 | help |
332 | This driver is for the DoubleTalk PC, a speech synthesizer | |
333 | manufactured by RC Systems (<http://www.rcsys.com/>). It is also | |
334 | called the `internal DoubleTalk'. | |
335 | ||
336 | To compile this driver as a module, choose M here: the | |
337 | module will be called dtlk. | |
338 | ||
ef141a0b SN |
339 | config XILINX_HWICAP |
340 | tristate "Xilinx HWICAP Support" | |
6fa612b5 | 341 | depends on XILINX_VIRTEX || MICROBLAZE |
ef141a0b SN |
342 | help |
343 | This option enables support for Xilinx Internal Configuration | |
344 | Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex | |
345 | FPGA platforms to partially reconfigure the FPGA at runtime. | |
346 | ||
347 | If unsure, say N. | |
348 | ||
1da177e4 LT |
349 | config R3964 |
350 | tristate "Siemens R3964 line discipline" | |
c7084edc | 351 | depends on TTY && BROKEN |
1da177e4 LT |
352 | ---help--- |
353 | This driver allows synchronous communication with devices using the | |
354 | Siemens R3964 packet protocol. Unless you are dealing with special | |
355 | hardware like PLCs, you are unlikely to need this. | |
356 | ||
357 | To compile this driver as a module, choose M here: the | |
358 | module will be called n_r3964. | |
359 | ||
360 | If unsure, say N. | |
361 | ||
362 | config APPLICOM | |
363 | tristate "Applicom intelligent fieldbus card support" | |
364 | depends on PCI | |
365 | ---help--- | |
366 | This driver provides the kernel-side support for the intelligent | |
367 | fieldbus cards made by Applicom International. More information | |
368 | about these cards can be found on the WWW at the address | |
369 | <http://www.applicom-int.com/>, or by email from David Woodhouse | |
370 | <dwmw2@infradead.org>. | |
371 | ||
372 | To compile this driver as a module, choose M here: the | |
373 | module will be called applicom. | |
374 | ||
375 | If unsure, say N. | |
376 | ||
377 | config SONYPI | |
65929215 | 378 | tristate "Sony Vaio Programmable I/O Control Device support" |
57dcf020 | 379 | depends on X86_32 && PCI && INPUT |
1da177e4 LT |
380 | ---help--- |
381 | This driver enables access to the Sony Programmable I/O Control | |
382 | Device which can be found in many (all ?) Sony Vaio laptops. | |
383 | ||
384 | If you have one of those laptops, read | |
9e1cbede | 385 | <file:Documentation/admin-guide/laptops/sonypi.rst>, and say Y or M here. |
1da177e4 LT |
386 | |
387 | To compile this driver as a module, choose M here: the | |
388 | module will be called sonypi. | |
389 | ||
09762516 YY |
390 | config GPIO_TB0219 |
391 | tristate "TANBAC TB0219 GPIO support" | |
bef1f402 | 392 | depends on TANBAC_TB022X |
584e1236 | 393 | select GPIO_VR41XX |
1da177e4 | 394 | |
1da177e4 LT |
395 | source "drivers/char/pcmcia/Kconfig" |
396 | ||
397 | config MWAVE | |
398 | tristate "ACP Modem (Mwave) support" | |
4f73bc4d | 399 | depends on X86 && TTY |
1da177e4 LT |
400 | select SERIAL_8250 |
401 | ---help--- | |
402 | The ACP modem (Mwave) for Linux is a WinModem. It is composed of a | |
403 | kernel driver and a user level application. Together these components | |
404 | support direct attachment to public switched telephone networks (PSTNs) | |
405 | and support selected world wide countries. | |
406 | ||
407 | This version of the ACP Modem driver supports the IBM Thinkpad 600E, | |
408 | 600, and 770 that include on board ACP modem hardware. | |
409 | ||
410 | The modem also supports the standard communications port interface | |
411 | (ttySx) and is compatible with the Hayes AT Command Set. | |
412 | ||
413 | The user level application needed to use this driver can be found at | |
414 | the IBM Linux Technology Center (LTC) web site: | |
415 | <http://www.ibm.com/linux/ltc/>. | |
416 | ||
417 | If you own one of the above IBM Thinkpads which has the Mwave chipset | |
418 | in it, say Y. | |
419 | ||
420 | To compile this driver as a module, choose M here: the | |
421 | module will be called mwave. | |
422 | ||
423 | config SCx200_GPIO | |
424 | tristate "NatSemi SCx200 GPIO Support" | |
425 | depends on SCx200 | |
7a8e2a5e | 426 | select NSC_GPIO |
1da177e4 LT |
427 | help |
428 | Give userspace access to the GPIO pins on the National | |
429 | Semiconductor SCx200 processors. | |
430 | ||
431 | If compiled as a module, it will be called scx200_gpio. | |
432 | ||
7a8e2a5e JC |
433 | config PC8736x_GPIO |
434 | tristate "NatSemi PC8736x GPIO Support" | |
3369465e | 435 | depends on X86_32 && !UML |
7a8e2a5e JC |
436 | default SCx200_GPIO # mostly N |
437 | select NSC_GPIO # needed for support routines | |
438 | help | |
439 | Give userspace access to the GPIO pins on the National | |
440 | Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip | |
441 | has multiple functional units, inc several managed by | |
442 | hwmon/pc87360 driver. Tested with PC-87366 | |
443 | ||
444 | If compiled as a module, it will be called pc8736x_gpio. | |
445 | ||
446 | config NSC_GPIO | |
447 | tristate "NatSemi Base GPIO Support" | |
699352c3 | 448 | depends on X86_32 |
7a8e2a5e JC |
449 | # selected by SCx200_GPIO and PC8736x_GPIO |
450 | # what about 2 selectors differing: m != y | |
451 | help | |
452 | Common support used (and needed) by scx200_gpio and | |
453 | pc8736x_gpio drivers. If those drivers are built as | |
454 | modules, this one will be too, named nsc_gpio | |
455 | ||
1da177e4 | 456 | config RAW_DRIVER |
abd4aa5a | 457 | tristate "RAW driver (/dev/raw/rawN)" |
9361401e | 458 | depends on BLOCK |
1da177e4 | 459 | help |
abd4aa5a DJ |
460 | The raw driver permits block devices to be bound to /dev/raw/rawN. |
461 | Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O. | |
1da177e4 LT |
462 | See the raw(8) manpage for more details. |
463 | ||
abd4aa5a | 464 | Applications should preferably open the device (eg /dev/hda1) |
1da177e4 LT |
465 | with the O_DIRECT flag. |
466 | ||
0de502aa | 467 | config MAX_RAW_DEVS |
0078bff5 | 468 | int "Maximum number of RAW devices to support (1-65536)" |
0de502aa | 469 | depends on RAW_DRIVER |
7143479a | 470 | range 1 65536 |
0de502aa AM |
471 | default "256" |
472 | help | |
473 | The maximum number of RAW devices that are supported. | |
474 | Default is 256. Increase this number in case you need lots of | |
475 | raw devices. | |
476 | ||
1da177e4 LT |
477 | config HPET |
478 | bool "HPET - High Precision Event Timer" if (X86 || IA64) | |
479 | default n | |
480 | depends on ACPI | |
481 | help | |
482 | If you say Y here, you will have a miscdevice named "/dev/hpet/". Each | |
483 | open selects one of the timers supported by the HPET. The timers are | |
3cb2fccc | 484 | non-periodic and/or periodic. |
1da177e4 | 485 | |
1da177e4 LT |
486 | config HPET_MMAP |
487 | bool "Allow mmap of HPET" | |
488 | default y | |
489 | depends on HPET | |
490 | help | |
491 | If you say Y here, user applications will be able to mmap | |
492 | the HPET registers. | |
493 | ||
3d035f58 PB |
494 | config HPET_MMAP_DEFAULT |
495 | bool "Enable HPET MMAP access by default" | |
496 | default y | |
497 | depends on HPET_MMAP | |
498 | help | |
1da177e4 LT |
499 | In some hardware implementations, the page containing HPET |
500 | registers may also contain other things that shouldn't be | |
3d035f58 PB |
501 | exposed to the user. This option selects the default (if |
502 | kernel parameter hpet_mmap is not set) user access to the | |
503 | registers for applications that require it. | |
1da177e4 | 504 | |
1da177e4 LT |
505 | config HANGCHECK_TIMER |
506 | tristate "Hangcheck timer" | |
abf3ea1b | 507 | depends on X86 || IA64 || PPC64 || S390 |
1da177e4 LT |
508 | help |
509 | The hangcheck-timer module detects when the system has gone | |
510 | out to lunch past a certain margin. It can reboot the system | |
511 | or merely print a warning. | |
512 | ||
fbd8ae10 DS |
513 | config UV_MMTIMER |
514 | tristate "UV_MMTIMER Memory mapped RTC for SGI UV" | |
515 | depends on X86_UV | |
516 | default m | |
517 | help | |
518 | The uv_mmtimer device allows direct userspace access to the | |
519 | UV system timer. | |
520 | ||
1da177e4 LT |
521 | source "drivers/char/tpm/Kconfig" |
522 | ||
1a80ba88 | 523 | config TELCLOCK |
03154a27 | 524 | tristate "Telecom clock driver for ATCA SBC" |
65929215 | 525 | depends on X86 |
1a80ba88 MG |
526 | default n |
527 | help | |
03154a27 MG |
528 | The telecom clock device is specific to the MPCBL0010 and MPCBL0050 |
529 | ATCA computers and allows direct userspace access to the | |
530 | configuration of the telecom clock configuration settings. This | |
531 | device is used for hardware synchronization across the ATCA backplane | |
532 | fabric. Upon loading, the driver exports a sysfs directory, | |
533 | /sys/devices/platform/telco_clock, with a number of files for | |
534 | controlling the behavior of this hardware. | |
1a80ba88 | 535 | |
4f911d64 | 536 | config DEVPORT |
f2cfa58b | 537 | bool "/dev/port character device" |
4f911d64 RK |
538 | depends on ISA || PCI |
539 | default y | |
f2cfa58b MB |
540 | help |
541 | Say Y here if you want to support the /dev/port device. The /dev/port | |
542 | device is similar to /dev/mem, but for I/O ports. | |
4f911d64 | 543 | |
61d48c2c MS |
544 | source "drivers/s390/char/Kconfig" |
545 | ||
7051924f EB |
546 | source "drivers/char/xillybus/Kconfig" |
547 | ||
873c38a4 TH |
548 | config ADI |
549 | tristate "SPARC Privileged ADI driver" | |
550 | depends on SPARC64 | |
551 | default m | |
552 | help | |
553 | SPARC M7 and newer processors utilize ADI (Application Data | |
554 | Integrity) to version and protect memory. This driver provides | |
555 | read/write access to the ADI versions for privileged processes. | |
556 | This feature is also known as MCD (Memory Corruption Detection) | |
557 | and SSM (Silicon Secured Memory). Intended consumers of this | |
558 | driver include crash and makedumpfile. | |
559 | ||
1da177e4 LT |
560 | endmenu |
561 | ||
39a8883a TT |
562 | config RANDOM_TRUST_CPU |
563 | bool "Trust the CPU manufacturer to initialize Linux's CRNG" | |
564 | depends on X86 || S390 || PPC | |
565 | default n | |
566 | help | |
567 | Assume that CPU manufacturer (e.g., Intel or AMD for RDSEED or | |
568 | RDRAND, IBM for the S390 and Power PC architectures) is trustworthy | |
569 | for the purposes of initializing Linux's CRNG. Since this is not | |
570 | something that can be independently audited, this amounts to trusting | |
571 | that CPU manufacturer (perhaps with the insistence or mandate | |
572 | of a Nation State's intelligence or law enforcement agencies) | |
573 | has not installed a hidden back door to compromise the CPU's | |
9b254366 KC |
574 | random number generation facilities. This can also be configured |
575 | at boot with "random.trust_cpu=on/off". |