Arch Linux ARM for the Raspberry Pi had the bcm2708-rng module set to load at boot; starting with kernel 4.4.7 the bcm2835_rng module replaces the former on Raspberry Pi 2 and Raspberry Pi 3 units.
Install rng-tools and tell the Hardware RNG Entropy Gatherer Daemon (rngd) where to find the hardware random number generator. This can be done by editing /etc/conf.d/rngd:
RNGD_OPTS="-o /dev/random -r /dev/hwrng" and enabling and starting the rngd service.
If haveged is running, it should be stopped and disabled, as it might compete with rngd and is only preferred when there is no hardware random number generator available.
Once completed, this change ensures that data from the hardware random number generator is fed into the kernel's entropy pool at /dev/random. To check the available entropy, run:
# cat /proc/sys/kernel/random/entropy_avail The number it reports should be around 3000, whereas before setting up rngd it would have been closer to 1000.
echo 'KEYMAP="br-abnt2.map.gz"'| sudo tee /etc/vconsole.conf