Initialize RNG using CPU RNG instructions


Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Initialize RNG using CPU RNG instructions
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Initialize the RNG using random numbers supplied by the CPU's
RNG instructions (e.g. RDRAND), if supported and available. These
random numbers are never used directly, but are rather hashed into
the main input pool, and this happens regardless of whether or not
this option is enabled. Instead, this option controls whether the
they are credited and hence can initialize the RNG. Additionally,
other sources of randomness are always used, regardless of this
setting. Enabling this implies trusting that the CPU can supply high
quality and non-backdoored random numbers.

Say Y here unless you have reason to mistrust your CPU or believe
its RNG facilities may be faulty. This may also be configured at
boot time with "random.trust_cpu=on/off".