Commit d172e7f5 authored by David Woodhouse's avatar David Woodhouse Committed by David Woodhouse

firmware: Add CONFIG_FIRMWARE_IN_KERNEL option.

This will control whether we build firmware into the kernel image for
_every_ driver which we convert to request_firmware(), to avoid a
proliferation of 'CONFIG_XXX_FIRMWARE' options for each one.

Default to 'y' for now, which is the wrong thing to do but people seem
to be insisting on it and refusing to even review patches until it's
done. And it does preserve the existing behaviour for built-in drivers.
Signed-off-by: default avatarDavid Woodhouse <>
parent 4d2acfbf
......@@ -34,6 +34,31 @@ config FW_LOADER
require userspace firmware loading support, but a module built outside
the kernel tree does.
bool "Include in-kernel firmware blobs in kernel binary"
depends on FW_LOADER
default y
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.
string "External firmware blobs to build into the kernel binary"
depends on FW_LOADER
......@@ -9,6 +9,11 @@ fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE))
# If CONFIG_FIRMWARE_IN_KERNEL is not set, then don't include any firmware
fw-shipped-y :=
firmware-y := $(fw-external-y) $(fw-shipped-y)
firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(firmware-y) $(fw-shipped-))))
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