The system will use the hardware RNG to modify the output of /dev/random and /dev/urandom, the only thing is that it doesn't increment the "guaranteed randomness available" counter.
realistically, I don't think it makes sense for anyone to depend on /dev/random and the 'available entropy' counter, the few cases that have super strict randomness guarantee requirements should just have a separate source of randomness
think of this as improving the quality of /dev/urandom rather than failing to get the full randomness of the hardware RNG
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