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package/linux-firmware: also install into images for early loading support

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Some drivers request their firmware very early when built into the kernel,
even before the initramfs is mounted - So the only way to provide firmware
for those drivers is to include them directly in the kernel with the
CONFIG_EXTRA_FIRMWARE option.

An example of this is the uC firmware for modern Intel GPUs.

Conceptually you can point CONFIG_EXTRA_FIRMWARE to
${TARGET_DIR}/lib/firmware, but then you cannot remove the firmware from the
initramfs and pay the size cost twice (inside the kernel + in initramfs), so
instead also install linux-firmware to the images dir, similar to how we do
it for intel-microcode.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Peter Korsgaard 2021-02-15 17:05:56 +01:00
parent 4cadbbfdb1
commit af49734349
1 changed files with 5 additions and 0 deletions
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5
package/linux-firmware/linux-firmware.mk
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@ -7,6 +7,7 @@
LINUX_FIRMWARE_VERSION = 20201022
LINUX_FIRMWARE_SITE = http://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
LINUX_FIRMWARE_SITE_METHOD = git
LINUX_FIRMWARE_INSTALL_IMAGES = YES
LINUX_FIRMWARE_CPE_ID_VENDOR = kernel
@ -691,4 +692,8 @@ define LINUX_FIRMWARE_INSTALL_TARGET_CMDS
$(call LINUX_FIRMWARE_INSTALL_FW, $(TARGET_DIR)/lib/firmware)
endef
define LINUX_FIRMWARE_INSTALL_IMAGES_CMDS
$(call LINUX_FIRMWARE_INSTALL_FW, $(BINARIES_DIR))
endef
$(eval $(generic-package))