Re: Bug#1033737: flash-kernel: Unable to run flash-kernel on EFI-based systems
In my image builder, I just mount a tmpfs over /sys/firmware to hide it:
https://github.com/Daniel-Abrecht/dpa-image-builder/blob/22a18b8108d07ef72595f5217fd196cd01ddb71f/script/chns#L100
An Image builder shouldn't mess with the hosts firmware anyway.
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