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RNGD burning the CPU for several minutes on boot

Category: Software
Product Number: ADSP-SC589
Software Version: Yocto 3.1.1

On boot, the command `/usr/sbin/rngd -f -r /dev/hwrng` is burning the CPU at 100% for several minutes.

I don't think OpenSSL uses `/dev/urandom` or `/dev/random` for prng seeding anymore (I could be wrong) and I think that's the only library/program which uses random numbers.

Unless there is something else on the board that uses random numbers.

So, how do I disable it? The board is almost unusable for the first few minutes that command is running.