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1da177e4 LT |
1 | menu "Generic Driver Options" |
2 | ||
6a8d8abb KS |
3 | config UEVENT_HELPER_PATH |
4 | string "path to uevent helper" | |
7934779a | 5 | default "" |
6a8d8abb KS |
6 | help |
7 | Path to uevent helper program forked by the kernel for | |
8 | every uevent. | |
7934779a KS |
9 | Before the switch to the netlink-based uevent source, this was |
10 | used to hook hotplug scripts into kernel device events. It | |
11 | usually pointed to a shell script at /sbin/hotplug. | |
12 | This should not be used today, because usual systems create | |
13 | many events at bootup or device discovery in a very short time | |
14 | frame. One forked process per event can create so many processes | |
15 | that it creates a high system load, or on smaller systems | |
16 | it is known to create out-of-memory situations during bootup. | |
6a8d8abb | 17 | |
573c9774 MN |
18 | To disable user space helper program execution at early boot |
19 | time specify an empty string here. This setting can be altered | |
20 | via /proc/sys/kernel/hotplug or via /sys/kernel/uevent_helper | |
21 | later at runtime. | |
22 | ||
2b2af54a | 23 | config DEVTMPFS |
4237e5fd | 24 | bool "Maintain a devtmpfs filesystem to mount at /dev" |
2b2af54a | 25 | help |
da5e4ef7 | 26 | This creates a tmpfs/ramfs filesystem instance early at bootup. |
4237e5fd KS |
27 | In this filesystem, the kernel driver core maintains device |
28 | nodes with their default names and permissions for all | |
29 | registered devices with an assigned major/minor number. | |
30 | Userspace can modify the filesystem content as needed, add | |
31 | symlinks, and apply needed permissions. | |
32 | It provides a fully functional /dev directory, where usually | |
33 | udev runs on top, managing permissions and adding meaningful | |
34 | symlinks. | |
35 | In very limited environments, it may provide a sufficient | |
36 | functional /dev without any further help. It also allows simple | |
37 | rescue systems, and reliably handles dynamic major/minor numbers. | |
2b2af54a | 38 | |
da5e4ef7 PK |
39 | Notice: if CONFIG_TMPFS isn't enabled, the simpler ramfs |
40 | file system will be used instead. | |
41 | ||
2b2af54a | 42 | config DEVTMPFS_MOUNT |
4237e5fd | 43 | bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs" |
2b2af54a KS |
44 | depends on DEVTMPFS |
45 | help | |
4237e5fd KS |
46 | This will instruct the kernel to automatically mount the |
47 | devtmpfs filesystem at /dev, directly after the kernel has | |
48 | mounted the root filesystem. The behavior can be overridden | |
49 | with the commandline parameter: devtmpfs.mount=0|1. | |
50 | This option does not affect initramfs based booting, here | |
51 | the devtmpfs filesystem always needs to be mounted manually | |
52 | after the roots is mounted. | |
53 | With this option enabled, it allows to bring up a system in | |
54 | rescue mode with init=/bin/sh, even when the /dev directory | |
55 | on the rootfs is completely empty. | |
2b2af54a | 56 | |
1da177e4 | 57 | config STANDALONE |
967857df | 58 | bool "Select only drivers that don't need compile-time external firmware" |
1da177e4 LT |
59 | default y |
60 | help | |
61 | Select this option if you don't have magic firmware for drivers that | |
62 | need it. | |
63 | ||
64 | If unsure, say Y. | |
65 | ||
66 | config PREVENT_FIRMWARE_BUILD | |
67 | bool "Prevent firmware from being built" | |
68 | default y | |
69 | help | |
70 | Say yes to avoid building firmware. Firmware is usually shipped | |
113647a2 | 71 | with the driver and only when updating the firmware should a |
72 | rebuild be made. | |
73 | If unsure, say Y here. | |
1da177e4 LT |
74 | |
75 | config FW_LOADER | |
6a108a14 | 76 | tristate "Userspace firmware loading support" if EXPERT |
d9b19199 | 77 | default y |
1da177e4 | 78 | ---help--- |
113647a2 | 79 | This option is provided for the case where none of the in-tree modules |
80 | require userspace firmware loading support, but a module built | |
81 | out-of-tree does. | |
1da177e4 | 82 | |
d172e7f5 DW |
83 | config FIRMWARE_IN_KERNEL |
84 | bool "Include in-kernel firmware blobs in kernel binary" | |
85 | depends on FW_LOADER | |
86 | default y | |
87 | help | |
88 | The kernel source tree includes a number of firmware 'blobs' | |
113647a2 | 89 | that are used by various drivers. The recommended way to |
156faf90 | 90 | use these is to run "make firmware_install", which, after |
91 | converting ihex files to binary, copies all of the needed | |
92 | binary files in firmware/ to /lib/firmware/ on your system so | |
d172e7f5 DW |
93 | that they can be loaded by userspace helpers on request. |
94 | ||
95 | Enabling this option will build each required firmware blob | |
96 | into the kernel directly, where request_firmware() will find | |
97 | them without having to call out to userspace. This may be | |
113647a2 | 98 | useful if your root file system requires a device that uses |
99 | such firmware and do not wish to use an initrd. | |
d172e7f5 DW |
100 | |
101 | This single option controls the inclusion of firmware for | |
113647a2 | 102 | every driver that uses request_firmware() and ships its |
103 | firmware in the kernel source tree, which avoids a | |
104 | proliferation of 'Include firmware for xxx device' options. | |
d172e7f5 DW |
105 | |
106 | Say 'N' and let firmware be loaded from userspace. | |
107 | ||
4d2acfbf DW |
108 | config EXTRA_FIRMWARE |
109 | string "External firmware blobs to build into the kernel binary" | |
110 | depends on FW_LOADER | |
111 | help | |
113647a2 | 112 | This option allows firmware to be built into the kernel for the case |
113 | where the user either cannot or doesn't want to provide it from | |
4d2acfbf DW |
114 | userspace at runtime (for example, when the firmware in question is |
115 | required for accessing the boot device, and the user doesn't want to | |
116 | use an initrd). | |
117 | ||
113647a2 | 118 | This option is a string and takes the (space-separated) names of the |
119 | firmware files -- the same names that appear in MODULE_FIRMWARE() | |
4d2acfbf DW |
120 | and request_firmware() in the source. These files should exist under |
121 | the directory specified by the EXTRA_FIRMWARE_DIR option, which is | |
113647a2 | 122 | by default the firmware subdirectory of the kernel source tree. |
4d2acfbf | 123 | |
113647a2 | 124 | For example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", copy |
125 | the usb8388.bin file into the firmware directory, and build the kernel. | |
126 | Then any request_firmware("usb8388.bin") will be satisfied internally | |
127 | without needing to call out to userspace. | |
4d2acfbf DW |
128 | |
129 | WARNING: If you include additional firmware files into your binary | |
113647a2 | 130 | kernel image that are not available under the terms of the GPL, |
4d2acfbf | 131 | then it may be a violation of the GPL to distribute the resulting |
113647a2 | 132 | image since it combines both GPL and non-GPL work. You should |
4d2acfbf DW |
133 | consult a lawyer of your own before distributing such an image. |
134 | ||
135 | config EXTRA_FIRMWARE_DIR | |
136 | string "Firmware blobs root directory" | |
137 | depends on EXTRA_FIRMWARE != "" | |
138 | default "firmware" | |
139 | help | |
140 | This option controls the directory in which the kernel build system | |
141 | looks for the firmware files listed in the EXTRA_FIRMWARE option. | |
113647a2 | 142 | The default is firmware/ in the kernel source tree, but by changing |
143 | this option you can point it elsewhere, such as /lib/firmware/ or | |
144 | some other directory containing the firmware files. | |
4d2acfbf | 145 | |
7b1269f7 TI |
146 | config FW_LOADER_USER_HELPER |
147 | bool "Fallback user-helper invocation for firmware loading" | |
148 | depends on FW_LOADER | |
149 | default y | |
150 | help | |
151 | This option enables / disables the invocation of user-helper | |
152 | (e.g. udev) for loading firmware files as a fallback after the | |
153 | direct file loading in kernel fails. The user-mode helper is | |
154 | no longer required unless you have a special firmware file that | |
155 | resides in a non-standard path. | |
156 | ||
1da177e4 LT |
157 | config DEBUG_DRIVER |
158 | bool "Driver Core verbose debug messages" | |
159 | depends on DEBUG_KERNEL | |
160 | help | |
161 | Say Y here if you want the Driver core to produce a bunch of | |
162 | debug messages to the system log. Select this if you are having a | |
163 | problem with the driver core and want to see more of what is | |
164 | going on. | |
165 | ||
166 | If you are unsure about this, say N here. | |
167 | ||
9ac7849e TH |
168 | config DEBUG_DEVRES |
169 | bool "Managed device resources verbose debug messages" | |
170 | depends on DEBUG_KERNEL | |
171 | help | |
172 | This option enables kernel parameter devres.log. If set to | |
173 | non-zero, devres debug messages are printed. Select this if | |
174 | you are having a problem with devres or want to debug | |
175 | resource management for a managed device. devres.log can be | |
176 | switched on and off from sysfs node. | |
177 | ||
178 | If you are unsure about this, Say N here. | |
179 | ||
4039483f MH |
180 | config SYS_HYPERVISOR |
181 | bool | |
182 | default n | |
eba6cd67 | 183 | |
9f13a1fd BH |
184 | config GENERIC_CPU_DEVICES |
185 | bool | |
186 | default n | |
187 | ||
74d1d82c LJ |
188 | config SOC_BUS |
189 | bool | |
190 | ||
b83a313b MB |
191 | source "drivers/base/regmap/Kconfig" |
192 | ||
d15bd7ee | 193 | config DMA_SHARED_BUFFER |
3b32a592 | 194 | bool |
d15bd7ee SS |
195 | default n |
196 | select ANON_INODES | |
197 | help | |
198 | This option enables the framework for buffer-sharing between | |
199 | multiple drivers. A buffer is associated with a file using driver | |
200 | APIs extension; the file's descriptor can then be passed on to other | |
201 | driver. | |
202 | ||
c64be2bb | 203 | config CMA |
967857df KC |
204 | bool "Contiguous Memory Allocator" |
205 | depends on HAVE_DMA_CONTIGUOUS && HAVE_MEMBLOCK | |
c64be2bb | 206 | select MIGRATION |
ee6f509c | 207 | select MEMORY_ISOLATION |
c64be2bb MS |
208 | help |
209 | This enables the Contiguous Memory Allocator which allows drivers | |
210 | to allocate big physically-contiguous blocks of memory for use with | |
211 | hardware components that do not support I/O map nor scatter-gather. | |
212 | ||
213 | For more information see <include/linux/dma-contiguous.h>. | |
214 | If unsure, say "n". | |
215 | ||
216 | if CMA | |
217 | ||
218 | config CMA_DEBUG | |
219 | bool "CMA debug messages (DEVELOPMENT)" | |
220 | depends on DEBUG_KERNEL | |
221 | help | |
222 | Turns on debug messages in CMA. This produces KERN_DEBUG | |
223 | messages for every CMA call as well as various messages while | |
224 | processing calls such as dma_alloc_from_contiguous(). | |
225 | This option does not affect warning and error messages. | |
226 | ||
227 | comment "Default contiguous memory area size:" | |
228 | ||
229 | config CMA_SIZE_MBYTES | |
230 | int "Size in Mega Bytes" | |
231 | depends on !CMA_SIZE_SEL_PERCENTAGE | |
232 | default 16 | |
233 | help | |
234 | Defines the size (in MiB) of the default memory area for Contiguous | |
235 | Memory Allocator. | |
236 | ||
237 | config CMA_SIZE_PERCENTAGE | |
238 | int "Percentage of total memory" | |
239 | depends on !CMA_SIZE_SEL_MBYTES | |
240 | default 10 | |
241 | help | |
242 | Defines the size of the default memory area for Contiguous Memory | |
243 | Allocator as a percentage of the total memory in the system. | |
244 | ||
245 | choice | |
246 | prompt "Selected region size" | |
5e97f3f9 | 247 | default CMA_SIZE_SEL_MBYTES |
c64be2bb MS |
248 | |
249 | config CMA_SIZE_SEL_MBYTES | |
250 | bool "Use mega bytes value only" | |
251 | ||
252 | config CMA_SIZE_SEL_PERCENTAGE | |
253 | bool "Use percentage value only" | |
254 | ||
255 | config CMA_SIZE_SEL_MIN | |
256 | bool "Use lower value (minimum)" | |
257 | ||
258 | config CMA_SIZE_SEL_MAX | |
259 | bool "Use higher value (maximum)" | |
260 | ||
261 | endchoice | |
262 | ||
263 | config CMA_ALIGNMENT | |
264 | int "Maximum PAGE_SIZE order of alignment for contiguous buffers" | |
265 | range 4 9 | |
266 | default 8 | |
267 | help | |
268 | DMA mapping framework by default aligns all buffers to the smallest | |
269 | PAGE_SIZE order which is greater than or equal to the requested buffer | |
270 | size. This works well for buffers up to a few hundreds kilobytes, but | |
271 | for larger buffers it just a memory waste. With this parameter you can | |
272 | specify the maximum PAGE_SIZE order for contiguous buffers. Larger | |
273 | buffers will be aligned only to this specified order. The order is | |
274 | expressed as a power of two multiplied by the PAGE_SIZE. | |
275 | ||
276 | For example, if your system defaults to 4KiB pages, the order value | |
277 | of 8 means that the buffers will be aligned up to 1MiB only. | |
278 | ||
279 | If unsure, leave the default value "8". | |
280 | ||
281 | config CMA_AREAS | |
282 | int "Maximum count of the CMA device-private areas" | |
283 | default 7 | |
284 | help | |
285 | CMA allows to create CMA areas for particular devices. This parameter | |
286 | sets the maximum number of such device private CMA areas in the | |
287 | system. | |
288 | ||
289 | If unsure, leave the default value "7". | |
290 | ||
291 | endif | |
292 | ||
eba6cd67 | 293 | endmenu |