5 sec boot

[NoiseEHC]

> can you do the hash as you copy it? it should be pretty close to free at 
> that point (since the CPU is waiting for memory/flash access it can do the 
> hash calculationwhen it would otherwise be stalled)
>
>   
According to my measurements the GeodeLX can fetch a new cache line (32 
bytes) every 20-25 clocks.
Unless you can do the hash <2 clocks/byte then you will only earn the 
looping time (assuming that the hashed blocks fit into the L1 cache).