summaryrefslogtreecommitdiff
path: root/drivers/base/Kconfig
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/base/Kconfig')
-rw-r--r--drivers/base/Kconfig64
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d7da109c24fd..d47482fa1d21 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -34,6 +34,70 @@ config FW_LOADER
require userspace firmware loading support, but a module built outside
the kernel tree does.
+config FIRMWARE_IN_KERNEL
+ bool "Include in-kernel firmware blobs in kernel binary"
+ depends on FW_LOADER
+ default y
+ help
+ The kernel source tree includes a number of firmware 'blobs'
+ which are used by various drivers. The recommended way to
+ use these is to run "make firmware_install" and to copy the
+ resulting binary files created in usr/lib/firmware directory
+ of the kernel tree to the /lib/firmware on your system so
+ that they can be loaded by userspace helpers on request.
+
+ Enabling this option will build each required firmware blob
+ into the kernel directly, where request_firmware() will find
+ them without having to call out to userspace. This may be
+ useful if your root file system requires a device which uses
+ such firmware, and do not wish to use an initrd.
+
+ This single option controls the inclusion of firmware for
+ every driver which usees request_firmare() and ships its
+ firmware in the kernel source tree, to avoid a proliferation
+ of 'Include firmware for xxx device' options.
+
+ Say 'N' and let firmware be loaded from userspace.
+
+config EXTRA_FIRMWARE
+ string "External firmware blobs to build into the kernel binary"
+ depends on FW_LOADER
+ help
+ This option allows firmware to be built into the kernel, for the
+ cases where the user either cannot or doesn't want to provide it from
+ userspace at runtime (for example, when the firmware in question is
+ required for accessing the boot device, and the user doesn't want to
+ use an initrd).
+
+ This option is a string, and takes the (space-separated) names of the
+ firmware files -- the same names which appear in MODULE_FIRMWARE()
+ and request_firmware() in the source. These files should exist under
+ the directory specified by the EXTRA_FIRMWARE_DIR option, which is
+ by default the firmware/ subdirectory of the kernel source tree.
+
+ So, for example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin",
+ copy the usb8388.bin file into the firmware/ directory, and build the
+ kernel. Then any request_firmware("usb8388.bin") will be
+ satisfied internally without needing to call out to userspace.
+
+ WARNING: If you include additional firmware files into your binary
+ kernel image which are not available under the terms of the GPL,
+ then it may be a violation of the GPL to distribute the resulting
+ image -- since it combines both GPL and non-GPL work. You should
+ consult a lawyer of your own before distributing such an image.
+
+config EXTRA_FIRMWARE_DIR
+ string "Firmware blobs root directory"
+ depends on EXTRA_FIRMWARE != ""
+ default "firmware"
+ help
+ This option controls the directory in which the kernel build system
+ looks for the firmware files listed in the EXTRA_FIRMWARE option.
+ The default is the firmware/ directory in the kernel source tree,
+ but by changing this option you can point it elsewhere, such as
+ the /lib/firmware/ directory or another separate directory
+ containing firmware files.
+
config DEBUG_DRIVER
bool "Driver Core verbose debug messages"
depends on DEBUG_KERNEL