log_urandom_seed() {
    echo "urandom-seed: $1" > /dev/kmsg
}

do_urandom_seed() {
    [ -c /dev/urandom ] || { log_urandom_seed "Something is wrong with /dev/urandom"; return; }
    seedrng 2>&1 | while read -r line; do
        log_urandom_seed "$line"
    done
}

boot_hook_add preinit_main do_urandom_seed