[coreboot] Found how to work some LEDs on P8Z77-M. Looking for implementation guidance.

[Keith Hui]

What an eye opener.

Yesterday I stumbled upon some boardviews for my board, and the pro
variant. That could also let me sort out the pro's serial port without
one actually on hand, but that's for another time.

The power button have never blinked while in S3 like it's supposed to.
I found that it is connected to GPIO27 on the PCH. I could adjust the
PCH GPIO config to make it blink. What is the best approach if I want
it to blink before entering S3, and stop it blinking after coming out
of?

Thanks
Keith