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1da177e4 LT |
1 | menu "Generic Driver Options" |
2 | ||
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3 | config UEVENT_HELPER_PATH |
4 | string "path to uevent helper" | |
5 | depends on HOTPLUG | |
7934779a | 6 | default "" |
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7 | help |
8 | Path to uevent helper program forked by the kernel for | |
9 | every uevent. | |
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10 | Before the switch to the netlink-based uevent source, this was |
11 | used to hook hotplug scripts into kernel device events. It | |
12 | usually pointed to a shell script at /sbin/hotplug. | |
13 | This should not be used today, because usual systems create | |
14 | many events at bootup or device discovery in a very short time | |
15 | frame. One forked process per event can create so many processes | |
16 | that it creates a high system load, or on smaller systems | |
17 | it is known to create out-of-memory situations during bootup. | |
6a8d8abb | 18 | |
2b2af54a | 19 | config DEVTMPFS |
4237e5fd | 20 | bool "Maintain a devtmpfs filesystem to mount at /dev" |
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21 | depends on HOTPLUG && SHMEM && TMPFS |
22 | help | |
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23 | This creates a tmpfs filesystem instance early at bootup. |
24 | In this filesystem, the kernel driver core maintains device | |
25 | nodes with their default names and permissions for all | |
26 | registered devices with an assigned major/minor number. | |
27 | Userspace can modify the filesystem content as needed, add | |
28 | symlinks, and apply needed permissions. | |
29 | It provides a fully functional /dev directory, where usually | |
30 | udev runs on top, managing permissions and adding meaningful | |
31 | symlinks. | |
32 | In very limited environments, it may provide a sufficient | |
33 | functional /dev without any further help. It also allows simple | |
34 | rescue systems, and reliably handles dynamic major/minor numbers. | |
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35 | |
36 | config DEVTMPFS_MOUNT | |
4237e5fd | 37 | bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs" |
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38 | depends on DEVTMPFS |
39 | help | |
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40 | This will instruct the kernel to automatically mount the |
41 | devtmpfs filesystem at /dev, directly after the kernel has | |
42 | mounted the root filesystem. The behavior can be overridden | |
43 | with the commandline parameter: devtmpfs.mount=0|1. | |
44 | This option does not affect initramfs based booting, here | |
45 | the devtmpfs filesystem always needs to be mounted manually | |
46 | after the roots is mounted. | |
47 | With this option enabled, it allows to bring up a system in | |
48 | rescue mode with init=/bin/sh, even when the /dev directory | |
49 | on the rootfs is completely empty. | |
2b2af54a | 50 | |
1da177e4 LT |
51 | config STANDALONE |
52 | bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL | |
53 | default y | |
54 | help | |
55 | Select this option if you don't have magic firmware for drivers that | |
56 | need it. | |
57 | ||
58 | If unsure, say Y. | |
59 | ||
60 | config PREVENT_FIRMWARE_BUILD | |
61 | bool "Prevent firmware from being built" | |
62 | default y | |
63 | help | |
64 | Say yes to avoid building firmware. Firmware is usually shipped | |
65 | with the driver, and only when updating the firmware a rebuild | |
66 | should be made. | |
67 | If unsure say Y here. | |
68 | ||
69 | config FW_LOADER | |
d9b19199 | 70 | tristate "Userspace firmware loading support" if EMBEDDED |
135c294f | 71 | depends on HOTPLUG |
d9b19199 | 72 | default y |
1da177e4 LT |
73 | ---help--- |
74 | This option is provided for the case where no in-kernel-tree modules | |
312c004d | 75 | require userspace firmware loading support, but a module built outside |
1da177e4 LT |
76 | the kernel tree does. |
77 | ||
d172e7f5 DW |
78 | config FIRMWARE_IN_KERNEL |
79 | bool "Include in-kernel firmware blobs in kernel binary" | |
80 | depends on FW_LOADER | |
81 | default y | |
82 | help | |
83 | The kernel source tree includes a number of firmware 'blobs' | |
84 | which are used by various drivers. The recommended way to | |
85 | use these is to run "make firmware_install" and to copy the | |
86 | resulting binary files created in usr/lib/firmware directory | |
87 | of the kernel tree to the /lib/firmware on your system so | |
88 | that they can be loaded by userspace helpers on request. | |
89 | ||
90 | Enabling this option will build each required firmware blob | |
91 | into the kernel directly, where request_firmware() will find | |
92 | them without having to call out to userspace. This may be | |
93 | useful if your root file system requires a device which uses | |
94 | such firmware, and do not wish to use an initrd. | |
95 | ||
96 | This single option controls the inclusion of firmware for | |
11f1fbcf | 97 | every driver which uses request_firmware() and ships its |
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98 | firmware in the kernel source tree, to avoid a proliferation |
99 | of 'Include firmware for xxx device' options. | |
100 | ||
101 | Say 'N' and let firmware be loaded from userspace. | |
102 | ||
4d2acfbf DW |
103 | config EXTRA_FIRMWARE |
104 | string "External firmware blobs to build into the kernel binary" | |
105 | depends on FW_LOADER | |
106 | help | |
107 | This option allows firmware to be built into the kernel, for the | |
108 | cases where the user either cannot or doesn't want to provide it from | |
109 | userspace at runtime (for example, when the firmware in question is | |
110 | required for accessing the boot device, and the user doesn't want to | |
111 | use an initrd). | |
112 | ||
113 | This option is a string, and takes the (space-separated) names of the | |
114 | firmware files -- the same names which appear in MODULE_FIRMWARE() | |
115 | and request_firmware() in the source. These files should exist under | |
116 | the directory specified by the EXTRA_FIRMWARE_DIR option, which is | |
117 | by default the firmware/ subdirectory of the kernel source tree. | |
118 | ||
119 | So, for example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", | |
120 | copy the usb8388.bin file into the firmware/ directory, and build the | |
121 | kernel. Then any request_firmware("usb8388.bin") will be | |
122 | satisfied internally without needing to call out to userspace. | |
123 | ||
124 | WARNING: If you include additional firmware files into your binary | |
125 | kernel image which are not available under the terms of the GPL, | |
126 | then it may be a violation of the GPL to distribute the resulting | |
127 | image -- since it combines both GPL and non-GPL work. You should | |
128 | consult a lawyer of your own before distributing such an image. | |
129 | ||
130 | config EXTRA_FIRMWARE_DIR | |
131 | string "Firmware blobs root directory" | |
132 | depends on EXTRA_FIRMWARE != "" | |
133 | default "firmware" | |
134 | help | |
135 | This option controls the directory in which the kernel build system | |
136 | looks for the firmware files listed in the EXTRA_FIRMWARE option. | |
137 | The default is the firmware/ directory in the kernel source tree, | |
138 | but by changing this option you can point it elsewhere, such as | |
139 | the /lib/firmware/ directory or another separate directory | |
140 | containing firmware files. | |
141 | ||
1da177e4 LT |
142 | config DEBUG_DRIVER |
143 | bool "Driver Core verbose debug messages" | |
144 | depends on DEBUG_KERNEL | |
145 | help | |
146 | Say Y here if you want the Driver core to produce a bunch of | |
147 | debug messages to the system log. Select this if you are having a | |
148 | problem with the driver core and want to see more of what is | |
149 | going on. | |
150 | ||
151 | If you are unsure about this, say N here. | |
152 | ||
9ac7849e TH |
153 | config DEBUG_DEVRES |
154 | bool "Managed device resources verbose debug messages" | |
155 | depends on DEBUG_KERNEL | |
156 | help | |
157 | This option enables kernel parameter devres.log. If set to | |
158 | non-zero, devres debug messages are printed. Select this if | |
159 | you are having a problem with devres or want to debug | |
160 | resource management for a managed device. devres.log can be | |
161 | switched on and off from sysfs node. | |
162 | ||
163 | If you are unsure about this, Say N here. | |
164 | ||
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165 | config SYS_HYPERVISOR |
166 | bool | |
167 | default n | |
eba6cd67 RD |
168 | |
169 | endmenu |