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Maintaining the system entropy pool with a HWRNG is quite important on embedded devices (e.g. RPI3) and on virtual instances, due to that these systems generate very little entropy on their own. Starting rng-tools early in the boot of a system with a hwrng avoids that the Linux kernel "blocks" for a couple of minutes during boot, before any services using entropy can start. This package supports feeding the kernel entopy pool with random data from different sources, among these /dev/hwrng and the Intel rdrand instruction. The reason for moving it to main is that rng-tools for these reasons also will be beneficial to provide on the Alpine installer media.