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How to use overlay for /lib/firmware ?


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I know that since 6.9.1 there's a overlayfs on /lib/firmware and /lib/modules to "make it possible to install 3rd party modules at boot time"


I need to add some bluetooth driver file to /lib/firmware to be installed during boot.


The overlayfs allows me to write on /lib/firmware (that ends up on /var/local/overlay/lib/firmware) but the files I add there disappear after a reboot (obviously). I don't understand how I'm supposed to use it to install 3rd party modules (or in my case a patch) at boot time.


I understand how I could is this for modprobe, is this the only use case supported?


Do I need to regenerate bzfirmware? If so, is there a tutorial for that?


My actual problem:

[   16.149827] Bluetooth: hci0: BCM: firmware Patch file not found, tried:
[   16.150209] Bluetooth: hci0: BCM: 'brcm/BCM20702A1-0a5c-21e8.hcd'


I have the hcd file, but not sure how to have it available at that point.


Thanks for the help.


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