This never bit me before, but since there was a question about it here
recently, I thought I'd mention it.
Due to systemd, EL7 _may_ require a kernel with the option
CONFIG_FW_LOADER=y
udev used to be able to use a userspace firmware loader helper to load a
firmware for the driver to use. Udev has since been sucked into systemd,
and the feature to use a helper has been dropped and now the kernel is
expected to handle the whole process on it's own.
That means that if you have hardware that requires a firmware blob
(typical example would be a WiFi module), it will stop working when you
upgrade to systemd if your kernel doesn't have the above feature built in.
Gordan
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