rng [devnum [n]]
The rng command reads the random number generator(RNG) device and prints the random bytes read on the console. A maximum of 64 bytes can be read in one invocation of the command.
The RNG device from which the random bytes are to be read. Defaults to 0.
Number of random bytes to be read and displayed on the console. Default value is 0x40. Max value is 0x40.