Rng-tools [1], mentioned in the article, can use a hardware rng's output as input to the kernel's prng. However, it needs to be configured correctly to avoid potential problems [2].

[1] http://www.gnu.org/software/hurd/user/tlecarrour/rng-tools.h...

[2] https://news.ycombinator.com/item?id=6040975