[coreboot] One QCLK is half a full clock cycle (tCK)

[Angel Pons]

Hi list,

I'm writing this email because there's one thing I always forget
about. Now that I am sure about it, I would like to write it down
somewhere so that I can't forget about it anymore. Anyway, that one
thing is:

On Intel memory controllers, one QCLK (Quadrature Clock) equals one
half of a full clock cycle, i.e. tCK / 2.

Best regards,

Angel, the tormentor of memory controllers