[systemd-devel] Problems loading firmware using built-in drivers with kernels that use initramfs.

[Liam Girdwood]

Currently firmware loading with built-in drivers is failing on systems
that mount an initramfs before the root FS is mounted (that contains the
firmware file). Modular drivers work fine.

Keyon (Jie, Yang) has done some testing with the Intel audio DSP driver
and found that the built-in firmware loading only works if the firmware
is included as part of the initramfs. The same has been seen with other
Intel drivers that use firmware.

In this case it looks like userspace (udevd ?) is checking initramfs for
pending firmware requests and returning not found if it cant find the
files, but it's not re-checking for any pending firmware requests once
the real FS is mounted. Is it possible to have udevd re-check the
pending firmware requests after the real FS is mounted ?

Thanks

Liam