[Bug 222256] RPI random number generator underruns when BCM2835_RNG_USE_CALLOUT is set

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222256

--- Comment #1 from Sylvain Garrigues <sylvain at sylvaingarrigues.com> ---
If I replace
                sc->sc_rnghz = hz / 100;
with
                sc->sc_rnghz = 175; /* or any other value > 175 */

in
https://github.com/freebsd/freebsd/blob/master/sys/arm/broadcom/bcm2835/bcm2835_rng.c#L461

the underruns disappear.

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